May 13, 2011
TI introduces the device of power level of digital audio amplifier exceeding 300W power-handling capability in the first batch of every passways
A few days ago, Dezhou instrument claimed to put out two sections of new PurePath Digital
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TI introduces the device of power level of digital audio amplifier exceeding 300W power-handling capability in the first batch of every passways
A few days ago, Dezhou instrument claimed to put out two sections of new PurePath Digital
ADI analog-digital converter combines with having stray dynamic range and low power consumption
The analog-digital converter of ADI Company combines with the first-class one stray dynamic range and low power consumption characteristic do not
--AD9524 ADC adopts small and capsulates and combines with high performance and low power consumption characteristic, Thus make it very suitable for application and handheld instrument and equipment of Wireless infrastructure About AD9254 analog-digital converter Imitate the device company " >U.S.A. simulation device Company (Analog Device, Inc., is abbreviated as ADI) Put out ADC9254 150 MSPS (sample a million times per second) Analog-digital converter (ADC) of conversion rate 14 bit definition Have expanded its applied device kind of Wireless infrastructure. There is no stray dynamic range (SFDR) in this sincere ADC work with 83 dB when 70 MHz ,The power consumption is only 430 mW at the same time - -The power consumption is solved more than the like and then reduce 50%. Such high SFDR, low power consumption, and little to capsulate size ' 7 mm
One pair of step-down type DC/DC converters LM2717-ADJ
LM2717-ADJ is the new product that half a company of country put out recently, it is a kind of double-output composed of two PWM step-down type converters, voltage adjustable IC. The leading particulars of this device: The switched current of the internal gas switching tube of the step-down type converters of No. the first is reachable 2.2A( R DS(ON) =0.16Ω) ; The switched current of the internal gas switching tube of the step-down type converters of No. the second is reachable 3.2A( RDS(ON) =0.16Ω) ; Input the voltage range 4- 20V; The output voltage can be had the resistance to presume outside by two, the low-voltage is 1.267V the most; Switching frequency can be presumed within the range of 300- 600kHz; There is low-voltage protection and overheat protective of input in inside; 24 pins TSSOP are capsulated; Operating temperature range - 40 ℃- +125 ℃.
This device constituent duplicate supply is mainly applied to the computer schedule products on TFT-LCD display unit, handheld electronic device, walkie electronic product and knee.
The pin arranges the and function
The pin of LM2717-ADJ is arranged and shown as in Fig. 1, the function of every pin is shown in Table 1.
The pin of Fig. 1 LM2717-ADJ is arranged
Pertinent parameter ( Representative value)
LM2717-ADJ pertinent parameter is as follows: Quiescent current I Q =2.7mA; Reference voltage V BG =1.267V; It is 4- 20V to input electric V IN; The limiting value of switched current: The first No. is 2.2A, the second No. is 3.2A; The frequency presumes it is the resistance R F: R F =4.64kΩ hour, F SW =300kHz; R F =2.26kΩ hour, F SW =600kHz; Close and control: Normal operation of power, VH> 1.8V; The power is closed, NL< 0.7V; Undervoltage is latched when the input voltage V IN is lower than 3.6V; Normal operation when the input voltage V IN is higher than 3.8V.
Circuit of typical application
Fig. 2 exports the application circuit of 15V and 3.3V
Fig. 3 exports the application circuit of 5V and 3.3V
Fig. 4 boots the boost-up circuit
The typical application of LM7217-ADJ circuit is shown as Fig. 2 and Fig. 3. Fig. 2 is a kind of input 17- 20V, export the application circuit of 15V and 3.3V; Fig. 3 exports the application circuit of 5V and 3.3V under the same input voltage. The basic parameters of these two pieces of circuit are the same, the main difference is presuming the output voltage is different to resistance-values of the resistance voltage divider which feedbacks the end. C BOOTx (x value is 1 or 2) in Figs. 2, 3 It is a bootstrap boost capacitor, it can improve the voltage of the driver, there is sufficient VGS voltage to guarantee N-MOSFET, as shown in Fig. 4. At the time of having electrically, from VIN D C BOOST LX C OUTX electric current of person who reach give C BOOST and C OUTX (including C OUTXA) Charge, because of C BOOST< < ( C OUTX+C OUTXA) ,So the voltage of V IN is lowered on C BOOST mostly. The voltage V CBOOST on C BOOST is equal to the driver voltage V DRI, has guaranteed V GS magnitude of voltage of N-MOSEFT.
This text mainly introduces the choice of the device parameter of hitting some times of the circuit.
Settlement of a output voltage
The backfeed loop in the output voltage V OUT and Figs. 1, 2 divides the compressive resistance R FB1(3) And R FB2(4) Relevant, its relational expression is:
V OUT =(1+R FB1(3) /R FB2(4) )
Connect the Equalized Charging technical research of the accumulator battery in a series
Voltage and capacity of the single storage battery are limited, should make up and connect the accumulator battery in a series to use under a lot of occasions. But the battery in accumulator battery has problem of equilibrium. What life time of raising the accumulator battery, improve stability and reduction cost of the system, it is the important problem in front of us.
The life time of the storage battery is determined, among them the most important thing is the physical property of storage battery by the factors in many aspects.
In addition, the system is the important reason for loss of life of the battery that battery management charges and discharges technical and low and not reasonable. To accumulator battery, remove the above-mentioned reason, the inconsistency among the monosomatous batteries is an important factor too. Monosomatous battery not isostatic phenomenon existing to the charging/discharging process of the storage battery, I analyze that has compared several kinds of present Equalized Charging methods, according with proposes actually that can't harm the Equalized Charging method, and verify the test.
Off-The-Shelf equilibrium charge-up method
Realize that carries on the Equalized Charging to every monosomatous battery which connects the accumulator battery in series, mainly there are the following methods at present.
1.Add an antithetical couplet equalization circuit on every monosomatous battery of the battery, in order to get the result of shunting. Under this kind of mode, when it is filled fully that a certain battery reach at first, the equalizing device can prevent it from being overcharged and transforming surplus energy into heat energy, battery charge that has not continued correctly being full of. This method is simple, but will bring the loss of energy, is not fit for the quick-charging system.
2.Monosomatous to each one before charging to discharge to the same level through the same load one by one, then carry on constant current charge, it so ases to be comparatively accurate balanced state guarantee one by one monosomatous. But to accumulator battery, because physical difference among the individual, each monosomatous to it reaches to be totally concerted ideal result while being difficult discharge deeply. Even reach the same result after discharging, will present the new unbalanced phenomenon in the course of charging.
3.Timing, sequence, gauging cell in the accumulator battery alone and charging evenly. While charging the accumulator battery, can guarantee charging or situation of the overdischarge will not have happened in every storage battery in the accumulator battery, therefore guarantee each storage battery in the accumulator battery is in normal working condition.
4.Use the timesharing principle, through control and switch of the switch assembly, make the extra electric current flow into the relatively lower battery of the voltage in order to achieve the charged purpose of the equilibrium. Efficiency of this method is higher, but control comparison is complicated.
Time shared control Equalized Charging schematic diagram of Fig. 1
5.Regard voltage parameter of every battery as the balanced target, make the voltage recorvery of every battery unanimous. As shown in Fig. 2, at the time of equalizing charge, the electric capacity is connected with two adjacent batteries alternately through the controlled switch, accept the charging of the high-voltage battery, and then discharge to the low-voltage battery, until two batteries of voltage reaches unanimity.
Unbalanced problem of battery voltage of settlement that this kind of balanced method is better, but this method is mainly used in the occasion of the battery with less quantity.
The balanced voltage of Fig. 2 charges the synoptic diagram of the principle
6.The overall system is mechanically controlled by the one piece, monosomatous battery all have independent a suit of module. The module, according to presuming the procedure, charge and manage every monosomatous battery respectively, charge the automatic disconnection after finishing.
This method is simpler, but will make the cost increase to count greatly a long time in the monosomatous battery, also unfavorable to the decrease of the systematic volume.
Can't harm and charge the way
This text can't harm and charge the way while proposing one kind. After Equalized Charging module start, overcharged battery will transfer to battery that not full of the surplus electric quantity, realize the dynamic equilibrium. Its loss with high efficiency is few, the battery voltage belonged to is controlled in the whole journey by the module of Equalized Charging.
A circuit design
N festival battery connects the constituent battery in series, the main loop current is Ich. Each connect the battery in series to connect with an balanced bypass, as shown in Fig. 3. BTi is a monosomatous battery in the picture, Si is MOSFET, the inductor Li is a storing energy component. Si, Li, Di form a current divider module Mi.
Charge in one in cycle, the working phase of the circuit is divided into two stages: The voltage measures stage ' Time is Tv) With Equalized Charging stage ' Time is Tc) . Measure stage in the voltage, balanced bypass circuit out-of-operation, the main power source charges the battery, measure the monosomatous battery voltage in the battery at the same time, and calculate the duty ratio of MOSFET according to the control algorithm. At Equalized Charging stage, MOSFET touched off in the bypass controls the on-off state by calculating the resulting duty ratio, deal with the Equalized Charging to the corresponding battery. During this stage, the electric current which flows through every monosomatous battery is constantly changeable, it is each not identical either.
Fig. 3 charges the way
Remove M1 connected to B1 both ends, it is uniform that all bypass current divider module makes up. In the intersection of Equalized Charging and bypass, because the intersection of diode and unidirectional the intersection of feed-through and function of Di, all the intersection of current divider and module will transfer to upstream battery surplus electric quantity from the corresponding battery, but a surplus electric quantity of M1 transfers to battery in the low reaches.
Calculation of 2 gas switching tube duty ratios
Charging state SOC (state of charge) of the battery while charging Can be obtained by the following empirical formula, among them V is the terminal voltage of the battery.
SOC =-0.24V 2+ 7.218V- 53.088( 1)
SOC is battery present capacity and proportion of nominal capacity, SOC=Q/QTOTAL
Vishay new solid tantalum capacitor chip
Can download JPEG picture (& lt from the following websites; 500K) : http://www.vishaypr.com/photopost/showphoto.php? photo =260 Pennsylvania, will it be May 17 2006 such as MALVERN- - a few days ago, VishayIntertechnology, Inc. (the intersection of NYSE and the intersection of stock market and code: VSH) Announce and put out adopting terminals (face-downtermination) downward Have lead frame tantalum capacitor,it is last the sources new of the midget capacitors of electronic system not to thus not offer to designer. New 298DMicroTan&-#; 8482 of Vishay; The capacitance value when 16V of the surface mounted capacitor is 1& micro; F is 47& micro when 4V; F, and have the area of 0603 and 0805 minor position occupied, so there are less required p-c board spaces, thus can make the volume of the terminal products smaller, the style is more novel. 298D device very suitable for SIGPROC signal processing and power management application in mobile phone, digital camera and MP3 apparatus, there are these devices
The high-speed multimedia switch which promises the semiconductor flies in the MicroPak # 8482; Or integrated USB and audio frequency switch function in the ultra compact type UMLP is capsulated
Face and design offering industry optimal function, characteristic and capsulate making portably up Flying promises the semi-conductive company (Fairchild Semiconductor) Put out the highly Integrated multimedia switch FSA201 and FSA221, offer the function, characteristic with leading industry and capsulate making up, suitable for a series of extensive walkie application. These two sections of devices integrated USB and negative-going swing in single capsulation It is (low and distorted) Switch function of the audio frequency. This kind of high integration density makes walkie application deal with USB or voice signal through an interface unit, help the designer to save the requirements for add ons. Bipolar compact type / double throw (DPDT) the The analog switch is especially suitable for expecting much the function and definite popular electronic product of space, its typical application includes mobile phone, MP3/MP4 player, digital camera,etc.. Fly and promise the manager Patty Miske of product market of semi-conductive simulation product division switch and claim: "It is closely linked with the market trend of the walkie products that the brand-new multimedia switch which promises the semiconductor flies, add more functionality in the same or smaller volume. For example, when used in mobile phone,etc. to employ, the multimedia switch can make the mobile phone pass a share interface unit, connect to the earphone or lap-top computer conveniently. Our new FSA221 switch is this kind of applied ideal choice, because it has integrated USB and audio frequency switch function at a high speed in subminiature UMLP capsulated, and offer the optimal characteristic of the industry at the same time. " It is offered the most extensive negative-going swing function on the market that FSA201 and FSA221 switch which promised the semiconductor flies (-2.0V) ,Improve system performance through improving signal quality, and because possess very low feed-through to hinder and resist (RON =3Ohms) ,So the reducible Off-The-Shelf power consumption lengthens the life time of the battery at the same time. In addition, its high ESD protects the function (10kV) Have further improved the reliability of the system. From the view point of saving the space of breadboard, FSA201 USB 1.1 is at full speed (12Mbps) The device is adopted 1.6mm x 2.1mm MicroPak
A kind of novel voltage taking a sample electrical machinery protector
Summary: This text has described protection feature, and overvoltage, voltage shortage of a kind of novel voltage taking a sample electrical machinery protector, interrupted (or error phase) Wait for the characteristic. Keyword: The novel voltage takes a sample; Protector of the electrical machinery; Protection feature
The foreword, in the use of the three-phase alternating current motor, it is used in the transmission Apparatus with irreversible three-phase (such as water pump, air blower, air compressor, lift electrical machinery,etc.) that increasingly many . In order to enable electrical machinery and can be protected in time under interrupting, phase sequence, overvoltage, voltage shortage situation, corresponding protector should have, protect the function while being above-mentioned, in order to guarantee electrical machinery and Apparatus normal safety work. In the voltage taking a sample protector, usually monitor the electrical machinery working voltage through the protector, judge the state of its voltage (such as overvoltage, voltage shortage, phase sequence, error phase, and the above-mentioned faulty indication appears on the protector faceplate) ,If is out of order, the protector, to control circuit Apparatus (such as the AC contactor) in the three-phase feed circuit Control, the major loop power of breaking, thus and transmit the Apparatus to carry on valid protection to the electrical machinery. Taking a sample its maximum point compared with taking a sample type of the electric current of protector of voltage is: It is with having nothing to do the power magnitude of protecting the electric equipment, and only protect according to situation of the quality of the network source, enabling and is protected electric Apparatus from power quality badly causes damage. Especially in the three-phase irreversible Apparatus or feedder line, after confirming the phase sequence, while maintaining or changing the power supply line and asserting originally the error phase of phase sequence meets, the protector can distinguish its original phase sequence, thus protect electrical machinery and corresponding apparatus.
Taking a sample protector of usually voltage of protection feature of the protector, mainly protect electrical machinery open phase and phase sequence, and in actual motion to electrical machinery, working voltage it in voltage shortage or overvoltages to be very difficult to blow get effective protection often, the real working condition of the electrical machinery to being protected, it is its protector that the operating range is wide; In this operating range (exchange three-phase 300V 460V) ,The protector realizes its voltage shortage and overvoltage protection movement characteristic (movement characteristic is shown in Fig. 1, Fig. 2) . In addition on the above-mentioned foundation of protecting the function, the protector can also follow the demand, not merely adjustable to overvoltage protection (380V 460V) And low-voltage protection (300V 380V is adjustable) The magnitude of voltage is set up, and it protects and delays time adjustable (overvoltage protection: Time delay 0.5S 5S is adjustable; Low-voltage protection: Time delay 1S 10S is adjustable) ,This protected the function and used and expanded and used the space for voltage taking a sample protector. Protector voltage shortage and movement characteristic of the overvoltage (Fig. 1) China, the intersection of characteristic and for being single-phase to pass the intersection of voltage shortage and the intersection of characteristic and line, characteristic line 2, pass, owe voltage characteristic line, characteristic line 3 to cross, owe voltage characteristic line for biphase for three phases 1 line.
The protector voltage shortage of Fig. 1 and movement characteristic of the overvoltage
Electrical machinery protector in design, consider protector should have overvoltage, voltage shortage, broken the intersection of error phase and 3 kinds of protection functions as an organic whole, adopt 3 input end negate AND gates and voltage comparators to finish this function. If the above-mentioned trouble takes place, in group IC4B (Fig. 2) Input end Determine to break error phase, overvoltage, voltage shortage trouble separately, signal input is " 0 " at this moment Level, and by the oppisite phase of group IC4C (use this group of output ends To drive the working condition of V1) Make V1 end, KA1 turns from attracting state into and releases the state, controls the contact to change. The contact of KA1, in order to release under the state (V1 end under the working condition) in Fig. 2 ,The intersection of protector and in the form of attracting KA1 (V1 enlarges under the working condition) when being like being in normal operation state .
The disconnected error phase of schematic diagram of picture 2 AS-11 electric motor protector protects the three-phase power to measure through A, B, C end, it put RC phase shift circuit into separately and three-phase power,such as will certainly,at n, w _ is minor in vector in nw at both ends, through voltage commutation to this, filter, make L3 (disconnected error phase) Point out, have in order to drive, then the intersection of photosensitive resister and IC2 (blow, isolate to sampling signal with working voltage) Conducting state that the place does not end. Thus make IC4A input end, end " 0" The state, export The end is " 1 " ,Mainly depend on IC4B inputs at this moment Change of the end. Interrupt while being mistaken or open phase vector, nw of _, increase at the trouble, through make L3 and IC2 work to rectification, filtering of voltage this. IC4A input end is " 1" ,Then output end It is " 0 " ,Thus cause V1 end, the intersection of KA1 and release, in the form of protection work protector. The work of voltage shortage protects and acts as group IC1A End (voltage shortage) Voltage with End (pass the partial pressure of R8, R9 resistance by IC4A end) ,In IC1A Terminal voltage U >U ,(conj.) The end is " 1 " ,Pilot lamp L1 work of voltage shortage. And compares (charges C5 through RP3, R11, sets for the guard time of voltage shortage) in IC1B ; It is " 0 " to carry UU When, the end is exported " 1" ,The pilot lamp L2 work of overvoltage, in IC1D End with End (RP4, R17 charge C9, the time setting of overvoltage protection) U
The typical application circuit of the circuit AS-11 electrical machinery protector of typical application is shown in Fig. 3.
Fig. 3 employs the example picture of the circuit
Conclude the speech voltage this take a sample protector of electrical machinery in case of two kinds overvoltage, voltage shortage, because it is wide to protect the voltage range, and voltage protection parameter value and guard time can be set up, this, in order to offer maximal convenience on user's inuse. In addition protect the most common open-phase trouble and phase sequence of electric motor, is not limited by the magnitude of horse-power of equipment of the electrical machinery, it is a taking a sample protector maximum characteristic of the voltage, have already been used extensively now.
Bibliographical reference: 1. Rise in Qian JinChuan, gold forest: The electric motor protector of electronic formula is simplied analyse, the electric Apparatus of the lathe, 2004.2 issues
New Vishay Siliconix SPDT analog switch
Have 0.4Ω Can last JPEG the pictures (& lt from websites following job voltage ranging; 500K) : http://www.vishaypr.com/photopost/showphoto.php? photo =- a few days ago on 257 California, Santa Clara - May 8, 2006, VishayIntertechnology, put out the single-pole double throw (SPDT) of three sections One piece CMOS analog switch, these devices have combined the voltage range of low job and rated value of the low on resistance in the minor capsulation of the size, they mainly face the signal route application in the walkie and battery-driven terminal products. These new DG2731, DG2732 and DG2733 analog switch can be used in mobile phone, PDA, walkie media player, loudspeaker earphone, hard disk drive and modem. These three new analog switches work within the range of single Operating supply voltage of 1.6V- 4.3V, their feed-through resistance quantity is only 0.4 ohms in maximum power, and deltarON is only 0.03 ohms, so is reducible and distorted and improving signal fidelity. These devices are very compatible with logical device of 1.6V, and can control the logical device to connect with undervoltage DSP or MCU easily, thus make it very suitable for the application from the lithium battery direct power supply of single core. Just as tested according to JESD78 standard, rely on one submicron of CMOS undervoltage technologies of Vishay, device these protection is higher than 300mA definitely. When opening, they can conduct signals in two power rails bidirectionally with the good result of identity, when closing, they know the block signal, and reach power level, and bring up the rear and connect protecting first. The switch of these devices is very fast, open time as 50ns when 4.3V, turn-off time is 14ns. Switch of two of these devices - DG2731 and DG2732- take the logical single control pin of reverse control. DG2731 has two switches that is the off state in normal cases and two switches that is the closed state, and it is that the switch of the off state and one are switch of the closed state in normal cases that DG2732 has three. Like DG2731, DG2733 has two switches that is the off state in normal cases and two switches that is the closed state too, this device also has EN pin that can launch it in the logic voltage great. All two kinds that these three devices have reducible terminal products measurement capsulate choosing small-scaly: There are unleaded (Pb)s Nickel palau alloy device terminal ( With " the E4 " The suffix represents) DFN-10 capsulate,and have likewise 100% lead-free fog tin terminal (suffix for " the - E3 " )MSOP-10 capsulate. The terminals of these two kinds of types accord with all JEDEC standards about solder-reflow and MSL rated value. The operating temperature range of these devices is - 40