CN110112920A - A kind of dedicated point of lithium battery is filled device - Google Patents

A kind of dedicated point of lithium battery is filled device Download PDF

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Publication number
CN110112920A
CN110112920A CN201910371666.0A CN201910371666A CN110112920A CN 110112920 A CN110112920 A CN 110112920A CN 201910371666 A CN201910371666 A CN 201910371666A CN 110112920 A CN110112920 A CN 110112920A
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CN
China
Prior art keywords
end
signal
pwm
controller
pwm controller
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CN201910371666.0A
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Chinese (zh)
Inventor
李云星
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杭州里德通信有限公司
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Priority to CN201910371666.0A priority Critical patent/CN110112920A/en
Publication of CN110112920A publication Critical patent/CN110112920A/en

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Classifications

    • H02J7/0052
    • H02J7/0065
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00Conversion of dc power input into dc power output
    • H02M3/22Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H02J2007/0059
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M2001/0003Details of control, feedback and regulation circuits
    • H02M2001/0012Control circuits using digital or numerical techniques

Abstract

The present invention relates to isolated power supply conversion systems, it discloses a kind of dedicated point of lithium battery and fills device, including shell and it is mounted on the intracorporal power conversion system of shell, power conversion system includes rectification unit (1), transformer (2), switching transistor (3), output unit (4), the first PWM controller (5), the second PWM controller (6), signal intercept unit (7) and load (8);System is using signal intercept unit as the connecting interface between the first PWM controller (5) and the second PWM controller (6); to realize digital communication; to improve anti-noise ability; improve the stability of electric operation; it avoids failure and ensures signal quality; the second PWM controller (6) has the characteristics that constant voltage/electric current simultaneously, particularly suitable for the application of the charge/discharge control to lithium battery, can protect battery.

Description

A kind of dedicated point of lithium battery is filled device

Technical field

The present invention relates to isolated power supply conversion system fields more particularly to dedicated point of a kind of lithium battery to fill device.

Background technique

Various electronic products need to have different voltages or the certain power of electric current could correct operation.For example, generic set 5V or 3V is needed at circuit (IC), motor needs 12V DC power supply, but for the lamp of LCD monitor, the higher electricity such as 1150V Pressure could enough.Therefore, suitable power adapter is highly desirable to the requirement for meeting practical application.

Dedicated point of lithium battery is filled device for that can carry out charging or directly power supply uses, two is many to lithium battery power supply In the case of, it point fills device connection socket and needs the stable DC of alternating current conversion layer relevant voltage, by input power and negative It carries and separates, damaged with preventing from loading because of the abnormal surge current that input power generates, safety and circuit design is simpler

Application number CN201620783340.0 is utility model patent, discloses a kind of multipath isolated power circuit, including DC/DC inverter power unit, the first transformer and control unit, and the primary side winding of the first transformer is connected to DC/DC The output end of inverter power unit, the output end of described control unit are connected to the control terminal of DC/DC inverter power unit, The power circuit further includes at least one second transformer and second transformer includes at least one vice-side winding;Described One transformer includes at least one vice-side winding, and the primary side winding of second transformer is connected to the pair of the first transformer Side winding.The vice-side winding of first transformer by being connected to the primary side windings of one or more second transformers by utility model And accurately realize that the power supply that multichannel is mutually isolated exports by the vice-side winding of the second transformer.But the circuit cannot obtain it is constant Voltage and constant current, and the feedback signal generated is analog signal, is easy the interference by external electric noise, so that noise holds It limits poor.

Summary of the invention

It the shortcomings that present invention is in the prior art ..., provides a kind of dedicated point of lithium battery and fills device.

In order to solve the above-mentioned technical problem, the present invention is addressed by following technical proposals:

A kind of dedicated point of lithium battery is filled device, including shell is with the intracorporal power conversion system of shell, power supply conversion is mounted on System includes rectification unit, transformer, switching transistor, output unit, PWM controller and signal intercept unit;

Rectification unit is used to AC electrical power conversion be DC electric power;Rectification unit is used to AC electric power VAC being transformed to DC electric power VDC, rectification unit can be realized by traditional bridge-type rectifier, but the range being not intended to be limiting of the invention, other classes The switching electronic equipment of type is also included in the present invention.

Transformer includes primary coil, ancillary coil and secondary coil, and primary coil receives DC power supply, and ancillary coil is logical The electric current generation auxiliary induction electric current that primary coil is flowed through in induction is crossed, auxiliary induction electric current flows through resistors in series and generates auxiliary Signal, secondary coil generate secondary induction electric current by the electric current of inductive primary coil;

Switching transistor is MOS transistor, has drain electrode, grid and source electrode or BJT, collector, base stage and emitter, leakage Pole or collector are connected to primary coil, and grid or base stage are connected to one end of sensing resistor, and the other end of sensing resistor is grounded, Source electrode or emitter generate inductive signal;MOS transistor is metal oxide semiconductor transistor, and BJT is bipolar junction transistor;

Output unit includes output transistor, output diode and output capacitor, the anode of output diode respectively with The drain electrode of output transistor is connected with one end of output capacitor, and the negative terminal of output diode and the source electrode of output transistor connect It connects, the other end of output capacitor is connect with secondary coil, and output capacitor is parallel-connected to load and generates output power;

First PWM controller includes first end, second end, third end, the 4th end, transmitting terminal and receiving end, and first end is floating It connecing, second end is connected by the grid or base stage of driving series resistance and switching transistor, third end reception auxiliary signal, and the 4th End connects by the source electrode or emitter of induction series resistance and switching transistor and is used to receive inductive signal;2nd PWM control Device processed includes first end, second end, third end, the 4th end, transmitting terminal and receiving end, the negative terminal company of first end and output diode It connects, the gate terminal connection of second end and output transistor, the anode of third end and output diode connects, and the 4th end and load connect It connects;

Signal intercept unit is connected between the first PWM controller and the second PWM controller, and signal is additionally provided in transformer Sensor coil, signal intercept unit realize the bi-directional signal communication of primary coil and secondary coil by sensing coil;The One PWM controller and the second PWM controller are all Pwm controller;

First PWM controller is executed based on the electric signal of inductive signal and auxiliary signal and the first PWM controller receiving end First control process, generates the driving signal with PWM feature, and driving signal is transmitted to by the second end of the first PWM controller The grid or base drive switching transistor of switching transistor, the first PWM controller the first digital output signal of generation, first First digital output signal is transmitted to the reception of the second PWM controller by signal blocker unit by the transmitting terminal of PWM controller End;

Preferably, the second PWM controller is according to first end, third end, the 4th end and second in the second PWM controller The electric signal of the receiving end of PWM controller executes the second control process, generates secondary coil adjustment signal, the second PWM controller The second side controller secondary coil adjustment signal is transmitted to the grid of output transistor, the second PWM controller generates second Second digital output signal is transmitted to by signal intercept unit by the transmitting terminal of digital output signal, the second PWM controller The receiving end of one PWM controller, the second PWM controller provide connecting interface for signal intercept unit.Connecting interface makes the first PWM Communication between controller and the second PWM controller is realized by digital signal.

Preferably, the first PWM controller includes digitial controller, pwm driver and ADC, digitial controller be CPU or The MCU of firmware program software is executed, digitial controller is electrically connected to pwm driver and ADC, and digitial controller is controlled from the first PWM The receiving end of device processed receives digital input signals and passes through the transmitting terminal transmission digital input signals of the first PWM controller, and first First end, third end and the 4th end of PWM controller connect with ADC and by first ends, the analog signal at third end and the 4th end Be converted into corresponding digital signal, digital signal provides digitial controller and generates digital PWM driving signal, pwm driver it is defeated Enter end and receive digital PWM driving signal, PWM driving generates analog drive signal and is transferred to by the output end of pwm driver The second end of first PWM controller.ADC is analog-digital converter, and CPU is central processing unit, and MCU is microcontroller.

Preferably, the digitial controller of the first PWM controller realizes that the first control process realizes the spy of PFC and/or LLC Property.PFC is PFC, and LLC is logic link control.

Preferably, the second PWM controller includes digitial controller, pwm driver and ADC, digitial controller be CPU or The MCU of firmware program software is executed, digitial controller is electrically connected to pwm driver and ADC, and digitial controller is controlled from the 2nd PWM The receiving end of device processed receives digital input signals and passes through the transmitting terminal transmission digital input signals of the second PWM controller, and second First end, third end and the 4th end of PWM controller connect with ADC and by first ends, the analog signal at third end and the 4th end Be converted into corresponding digital signal, digital signal provides digitial controller and generates digital PWM driving signal, pwm driver it is defeated Enter end and receive digital PWM driving signal, PWM driving generates analog drive signal and is transferred to by the output end of pwm driver The second end of second PWM controller.ADC is analog-digital converter, and CPU is central processing unit, and MCU is microcontroller.

Preferably, using the second PWM controller digitial controller realize the second control process realize constant pressure, constant current, The characteristic of synchronous rectification and line end compensation.

The present invention is due to using above technical scheme, with significant technical effect:

First PWM controller is based on inductive signal and auxiliary signal executes the first control process to generate with PWM feature Driving signal, driving signal is transferred to the grid of switching transistor by the second end of the first PWM controller, and switching transistor is driven Dynamic switching transistor, the first PWM controller generate the first digital output signal, and the transmitting terminal of the first PWM controller passes through signal First digital output signal is sent to the receiving end of the second PWM controller by blocking unit.Secondary coil adjustment signal to output The grid of transistor, the second PWM controller generate the second digital output signal, and the transmitting terminal of the second PWM controller passes through signal The receiving end that second digital output signal is transferred to the first PWM controller is prevented into unit.

System using signal intercept unit as the connecting interface between the first PWM controller and the second PWM controller, with It realizes that digital communication improves the stability of electric operation to improve anti-noise ability, avoids failure and ensure signal quality, together When the second PWM controller have constant voltage/current characteristic particularly suitable for lithium battery charge/discharge control application, Battery can be protected.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of invention.

Fig. 2 is the functional-block diagram of the first PWM controller or the second PWM controller of the invention

Fig. 3 is electrically operated example waveform according to the present invention.

The toponym that each number designation is referred in the figures above is as follows: where 1-rectification unit, 2-transformers, 3-switching transistors, 4-output units, the 5-the first PWM controller, the 6-the second PWM controller, 7-signal intercept units, 8-loads, 21-primary coils, 22-ancillary coils, 23-secondary coils, 41-output transistors, 42-output diodes, 43-output capacitors, 51-pwm drivers, 52-digitial controllers, 53-ADC.

Specific embodiment

Present invention is further described in detail with embodiment with reference to the accompanying drawing.

Embodiment 1

A kind of dedicated point of lithium battery is filled device, including shell is with the intracorporal power conversion system of shell, power supply conversion is mounted on System include rectification unit 1, transformer 2, switching transistor 3, output unit 4, the first PWM controller 5, the second PWM controller 6, Signal intercept unit 7 and load 8;

Rectification unit 1 is used to AC electrical power conversion be DC electric power;

Transformer 2 includes primary coil 21, ancillary coil 22 and secondary coil 23, and primary coil 21 receives DC power supply, Ancillary coil 22 generates auxiliary induction electric current by the electric current that primary coil 21 is flowed through in induction, and auxiliary induction electric current flows through series electrical It hinders device and generates auxiliary signal, secondary coil 23 generates secondary induction electric current by the electric current of inductive primary coil 21;

Switching transistor 3 is MOS transistor, has drain electrode, grid and source electrode or BJT, collector, base stage and emitter, Drain electrode or collector are connected to primary coil 21, and grid or base stage are connected to one end of sensing resistor, the other end of sensing resistor Ground connection, source electrode or emitter generate inductive signal;

Output unit 4 includes output transistor 41, output diode 42 and output capacitor 43, and output diode 42 is just End is connect with one end of the drain electrode of output transistor 41 and output capacitor 43 respectively, and the negative terminal of output diode 42 and output are brilliant The source electrode of body pipe 41 connects, and the other end of output capacitor 43 is connect with secondary coil 23, and output capacitor 43 is parallel-connected to Load 8 simultaneously generates output power;

First PWM controller 5 includes first end, second end, third end, the 4th end, transmitting terminal and receiving end, and first end is floating It connecing, for second end by driving series resistance to connect with the grid of switching transistor 3 or base stage, third end receives auxiliary signal, the Four ends connect with the source electrode of switching transistor 3 or emitter by incuding series resistance and are used to receive inductive signal;

Second PWM controller 6 include first end, second end, third end, the 4th end, transmitting terminal and receiving end, first end with The negative terminal of output diode 42 connects, and second end is connect with the gate terminal of output transistor 41, third end and output diode 42 Anode connection, the 4th end 8 is connect with loading;

Signal intercept unit 7 is connected between the first PWM controller 5 and the second PWM controller 6, is additionally provided in transformer 2 Sensing coil, signal intercept unit 7 realize the two-way letter of primary coil 21 and secondary coil 23 by sensing coil Signal communication.

First PWM controller 5 is held based on the electric signal of inductive signal and auxiliary signal and 5 receiving end of the first PWM controller The first control process of row, generates the driving signal with PWM feature, and the second end of the first PWM controller 5 transmits driving signal To the grid or base drive switching transistor 3 of switching transistor 3, the first PWM controller 5 generates the first digital output signal, First digital output signal is transmitted to the second PWM controller 6 by signal blocker unit by the transmitting terminal of the first PWM controller 5 Receiving end.

Second PWM controller 6 is according to first end, third end, the 4th end and the second PWM controller in the second PWM controller 6 The electric signal of 6 receiving end executes the second control process, generates secondary coil adjustment signal, the second end of the second PWM controller 6 Secondary coil adjustment signal is transmitted to the grid of output transistor 41 by controller, and it is defeated that the second PWM controller 6 generates the second number Second digital output signal is transmitted to the first PWM by signal intercept unit 7 by the transmitting terminal of signal out, the second PWM controller 6 The receiving end of controller 5, the second PWM controller 6 are that signal intercept unit 7 provides connecting interface.

First PWM controller 5 includes digitial controller 52, pwm driver 51 and ADC53, and digitial controller 52 is CPU, Digitial controller 52 is electrically connected to pwm driver 51 and ADC53, and digitial controller 52 is terminated from the reception of the first PWM controller 5 It receives digital input signals and digital input signals is transmitted by the transmitting terminal of the first PWM controller 5, the of the first PWM controller 5 One end, third end and the 4th end are converted into corresponding with ADC53 connection and by the analog signal of first end, third end and the 4th end Digital signal, digital signal provide digitial controller 52 and generate digital PWM driving signal, and the input terminal of pwm driver 51 receives Digital PWM driving signal, PWM driving generate analog drive signal and are transferred to the first PWM by the output end of pwm driver 51 The second end of controller 5.

The digitial controller 52 of first PWM controller 5 realizes that the first control process realizes the characteristic of PFC and/or LLC.

Second PWM controller 6 includes digitial controller 52, pwm driver 51 and ADC53, and digitial controller 52 is CPU, Digitial controller 52 is electrically connected to pwm driver 51 and ADC53, and digitial controller 52 is terminated from the reception of the second PWM controller 6 It receives digital input signals and digital input signals is transmitted by the transmitting terminal of the second PWM controller 6, the of the second PWM controller 6 One end, third end and the 4th end are converted into corresponding with ADC53 connection and by the analog signal of first end, third end and the 4th end Digital signal, digital signal provide digitial controller 52 and generate digital PWM driving signal, and the input terminal of pwm driver 51 receives Digital PWM driving signal, PWM driving generate analog drive signal and are transferred to the 2nd PWM by the output end of pwm driver 51 The second end of controller 6.

Using the second PWM controller 6 digitial controller 52 realize the second control process realize constant pressure, constant current, synchronize it is whole The characteristic of stream and line end compensation.

Embodiment 2

A kind of dedicated point of lithium battery is filled device, including shell is with the intracorporal power conversion system of shell, power supply conversion is mounted on System include rectification unit 1, transformer 2, switching transistor 3, output unit 4, the first PWM controller 5, the second PWM controller 6, Signal intercept unit 7 and load 8;

Rectification unit 1 is used to AC electrical power conversion be DC electric power;

Transformer 2 includes primary coil 21, ancillary coil 22 and secondary coil 23, and primary coil 21 receives DC power supply, Ancillary coil 22 generates auxiliary induction electric current by the electric current that primary coil 21 is flowed through in induction, and auxiliary induction electric current flows through series electrical It hinders device and generates auxiliary signal, secondary coil 23 generates secondary induction electric current by the electric current of inductive primary coil 21;

Switching transistor 3 is MOS transistor, has drain electrode, grid and source electrode or BJT, collector, base stage and emitter, Drain electrode or collector are connected to primary coil 21, and grid or base stage are connected to one end of sensing resistor, the other end of sensing resistor Ground connection, source electrode or emitter generate inductive signal;

Output unit 4 includes output transistor 41, output diode 42 and output capacitor 43, and output diode 42 is just End is connect with one end of the drain electrode of output transistor 41 and output capacitor 43 respectively, and the negative terminal of output diode 42 and output are brilliant The source electrode of body pipe 41 connects, and the other end of output capacitor 43 is connect with secondary coil 23, and output capacitor 43 is parallel-connected to Load 8 simultaneously generates output power;

First PWM controller 5 includes first end, second end, third end, the 4th end, transmitting terminal and receiving end, and first end is floating It connecing, for second end by driving series resistance to connect with the grid of switching transistor 3 or base stage, third end receives auxiliary signal, the Four ends connect with the source electrode of switching transistor 3 or emitter by incuding series resistance and are used to receive inductive signal;

Second PWM controller 6 include first end, second end, third end, the 4th end, transmitting terminal and receiving end, first end with The negative terminal of output diode 42 connects, and second end is connect with the gate terminal of output transistor 41, third end and output diode 42 Anode connection, the 4th end 8 is connect with loading;

Signal intercept unit 7 is connected between the first PWM controller 5 and the second PWM controller 6, is additionally provided in transformer 2 Sensing coil, signal intercept unit 7 realize the two-way letter of primary coil 21 and secondary coil 23 by sensing coil Signal communication.

First PWM controller 5 is held based on the electric signal of inductive signal and auxiliary signal and 5 receiving end of the first PWM controller The first control process of row, generates the driving signal with PWM feature, and the second end of the first PWM controller 5 transmits driving signal To the grid or base drive switching transistor 3 of switching transistor 3, the first PWM controller 5 generates the first digital output signal, First digital output signal is transmitted to the second PWM controller 6 by signal blocker unit by the transmitting terminal of the first PWM controller 5 Receiving end.

Second PWM controller 6 is according to first end, third end, the 4th end and the second PWM controller in the second PWM controller 6 The electric signal of 6 receiving end executes the second control process, generates secondary coil adjustment signal, the second end of the second PWM controller 6 Secondary coil adjustment signal is transmitted to the grid of output transistor 41 by controller, and it is defeated that the second PWM controller 6 generates the second number Second digital output signal is transmitted to the first PWM by signal intercept unit 7 by the transmitting terminal of signal out, the second PWM controller 6 The receiving end of controller 5, the second PWM controller 6 are that signal intercept unit 7 provides connecting interface.

First PWM controller 5 includes digitial controller 52, pwm driver 51 and ADC53, and digitial controller 52 is to execute The MCU of firmware program software, digitial controller 52 are electrically connected to pwm driver 51 and ADC53, digitial controller 52 from first The receiving end of PWM controller 5 receives digital input signals and transmits numeral input letter by the transmitting terminal of the first PWM controller 5 Number, first end, third end and the 4th end of the first PWM controller 5 connect with ADC53 and by first end, third end and the 4th ends Analog signal be converted into corresponding digital signal, digital signal provides digitial controller 52 and generates digital PWM driving signal, The input terminal of pwm driver 51 receives digital PWM driving signal, and PWM driving generates analog drive signal and passes through pwm driver 51 output end is transferred to the second end of the first PWM controller 5.

The digitial controller 52 of first PWM controller 5 realizes that the first control process realizes the characteristic of PFC and/or LLC.

Second PWM controller 6 includes digitial controller 52, pwm driver 51 and ADC53, and digitial controller 52 is to execute The MCU of firmware program software, digitial controller 52 are electrically connected to pwm driver 51 and ADC53, digitial controller 52 from second The receiving end of PWM controller 6 receives digital input signals and transmits numeral input letter by the transmitting terminal of the second PWM controller 6 Number, first end, third end and the 4th end of the second PWM controller 6 connect with ADC53 and by first end, third end and the 4th ends Analog signal be converted into corresponding digital signal, digital signal provides digitial controller 52 and generates digital PWM driving signal, The input terminal of pwm driver 51 receives digital PWM driving signal, and PWM driving generates analog drive signal and passes through pwm driver 51 output end is transferred to the second end of the second PWM controller 6.

Using the second PWM controller 6 digitial controller 52 realize the second control process realize constant pressure, constant current, synchronize it is whole The characteristic of stream and line end compensation.

Embodiment 3

A kind of dedicated point of lithium battery is filled device, and as shown in Figs. 1-2, transformer 2 consists essentially of primary coil 21, ancillary coil 22 and secondary coil 23.Primary coil 21 is configured as receiving DC electric power VDC, and ancillary coil 22 flows through primary by induction The electric current of coil 211 generates auxiliary induction electric current.Auxiliary induction electric current flows further through resistors in series R1X and generates auxiliary Signal VAUX.In addition, the electric current due to sensing primary coil, secondary coil 23 generates secondary induction electric current, is then communicated to Output unit 50.

Switching transistor 3 is hereinafter realized by MOS transistor.The drain electrode of switching transistor 3, grid and source electrode respectively with Collector, base stage are identical with emitter.Drain electrode is connected to primary coil 21, and grid is connected to one end of sense resistor RCS, and And the other end ground connection of sense resistor RCS.The source electrode of switching transistor 3 and the tie point of sense resistor RCS generate induction Signal VCS.

First PWM controller 5 has first end P1, second end P2, third end P3, the 4th end P4, transmitting terminal TX and reception Hold RX.First PWM controller 5 is based on inductive signal VCS and auxiliary signal VAUX and executes the first control process to generate with PWM Driving signal is transferred to the grid of switching transistor by the second end P2 of the driving signal of feature, the first PWM controller 5, switch 3 driving switch transistor 3 of transistor, the first PWM controller 5 generate the first digital output signal, the transmission of the first PWM controller First digital output signal is sent to the receiving end of the second PWM controller by signal blocker unit by end.Secondary coil adjustment Grid of the signal to output transistor, the second PWM controller the second digital output signal of generation, the transmission of the second PWM controller Second digital output signal is transferred to the receiving end of the first PWM controller 5 by signal by end.

Embodiment 4

An electrically operated example waveform for isolation power conversion system of the invention, as shown in Figure 3.In Fig. 3, IQ It is the conducting electric current of primary coil 21, IDOUT is the conducting electric current of ancillary coil 22, and tON is to turn on the time of primary coil 21, TOFF is the time that IDOU is not zero, and tS is the period of driving signal VPWM.In addition, synchronous rectification signal SR comes from the first PWM The receiving end RX of controller 5.

Above-mentioned synchronous rectification effectively reduces loss caused by secondary side output diode 42, to improve function Rate transfer efficiency.

It is put by the constant voltage/current characteristic is particularly suitable for charging to rechargeable battery/that the second PWM controller provides The application of electric control.This is because conventional batteries have lower voltage and preferably need perseverance in the initial stage of charging Constant-current charge.When reaching peak when the voltage of battery is in constant current charging, constant voltage charging and battery are executed Voltage gradually decreases to zero.Therefore, the second PWM controller is configured as executing constant current charging when starting, then in electricity It is switched to constant voltage charging when cell voltage highest, to meet actual requirement, has the function of protecting battery.

In short, the foregoing is merely presently preferred embodiments of the present invention, it is all according to equalization made by scope of the present invention patent Variation and modification, shall all be covered by the patent of the invention.

Claims (7)

1. a kind of dedicated point of lithium battery is filled device, including shell and it is mounted on the intracorporal power conversion system of shell, it is characterised in that: electricity Source converting system includes rectification unit (1), transformer (2), switching transistor (3), output unit (4), the first PWM controller (5), the second PWM controller (6), signal intercept unit (7) and load (8);
Rectification unit (1) is used to AC electrical power conversion be DC electric power;
Transformer (2) includes primary coil (21), ancillary coil (22) and secondary coil (23), and primary coil (21) receives direct current Power supply, ancillary coil (22) generate auxiliary induction electric current, auxiliary induction electric current by the electric current that primary coil (21) is flowed through in induction It flows through resistors in series and generates auxiliary signal, secondary coil (23) generates secondary sense by the electric current of inductive primary coil (21) Answer electric current;
Switching transistor (3) is MOS transistor, has drain electrode, grid and source electrode or BJT, collector, base stage and emitter, leakage Pole or collector are connected to primary coil (21), and grid or base stage are connected to one end of sensing resistor, the other end of sensing resistor Ground connection, source electrode or emitter generate inductive signal;
Output unit (4) includes output transistor (41), output diode (42) and output capacitor (43), output diode (42) anode is connect with one end of the drain electrode of output transistor (41) and output capacitor (43) respectively, output diode (42) Negative terminal connect with the source electrode of output transistor (41), the other end of output capacitor (43) is connect with secondary coil (23), defeated Capacitor (43) is parallel-connected to load (8) and generates output power out;
First PWM controller (5) includes first end, second end, third end, the 4th end, transmitting terminal and receiving end, and first end is floating It connecing, for second end by driving series resistance to connect with the grid of switching transistor (3) or base stage, third end receives auxiliary signal, 4th end connect with the source electrode of switching transistor (3) or emitter by incuding series resistance and is used to receive inductive signal;
Second PWM controller (6) includes first end, second end, third end, the 4th end, transmitting terminal and receiving end, first end with it is defeated The negative terminal connection of diode (42), second end are connect with the gate terminal of output transistor (41) out, third end and output diode (42) anode connection, the 4th end is connect with load (8);
Signal intercept unit (7) is connected between the first PWM controller (5) and the second PWM controller (6), in transformer (2) also Equipped with sensing coil, signal intercept unit (7) realizes primary coil (21) and secondary coil by sensing coil (23) bi-directional signal communication.
2. dedicated point of a kind of lithium battery according to claim 1 is filled device, it is characterised in that: the first PWM controller (5) is based on The electric signal of inductive signal and auxiliary signal and the first PWM controller (5) receiving end executes the first control process, and generation has Driving signal is transmitted to the grid of switching transistor (3) by the second end of the driving signal of PWM feature, the first PWM controller (5) Or base drive switching transistor (3), the first PWM controller (5) generate the first digital output signal, the first PWM controller (5) Transmitting terminal the first digital output signal is transmitted to the receiving ends of the second PWM controller (6) by signal blocker unit.
3. dedicated point of a kind of lithium battery according to claim 1 is filled device, it is characterised in that: the second PWM controller (6) basis First end in second PWM controller (6), third end, the 4th end and the second PWM controller (6) the electric signal of receiving end execute Second control process, generates secondary coil adjustment signal, and the second side controller of the second PWM controller (6) is by secondary coil tune Section signal is transmitted to the grid of output transistor (41), and the second PWM controller (6) generates the second digital output signal, the 2nd PWM Second digital output signal is transmitted to the first PWM controller (5) by signal intercept unit (7) by the transmitting terminal of controller (6) Receiving end, the second PWM controller (6) be signal intercept unit (7) provide connecting interface.
4. dedicated point of a kind of lithium battery according to claim 1 is filled device, it is characterised in that: the first PWM controller (5) includes Digitial controller (52), pwm driver (51) and ADC (53), digitial controller (52) are CPU or execute firmware program software MCU, digitial controller (52) are electrically connected to pwm driver (51) and ADC (53), and digitial controller (52) is controlled from the first PWM The receiving end of device (5) receives digital input signals and transmits digital input signals by the transmitting terminal of the first PWM controller (5), First end, third end and the 4th end of first PWM controller (5) connect with ADC (53) and by first end, third end and the 4th ends Analog signal be converted into corresponding digital signal, digital signal provides digitial controller (52) and generates digital PWM driving signal, The input terminal of pwm driver (51) receives digital PWM driving signal, and PWM driving generates analog drive signal and driven by PWM The output end of device (51) is transferred to the second end of the first PWM controller (5).
5. dedicated point of a kind of lithium battery according to claim 4 is filled device, it is characterised in that: the number of the first PWM controller (5) Word controller (52) realizes that the first control process realizes the characteristic of PFC and/or LLC.
6. dedicated point of a kind of lithium battery according to claim 1 is filled device, it is characterised in that: the second PWM controller (6) includes Digitial controller (52), pwm driver (51) and ADC (53), digitial controller (52) are CPU or execute firmware program software MCU, digitial controller (52) are electrically connected to pwm driver (51) and ADC (53), and digitial controller (52) is controlled from the 2nd PWM The receiving end of device (6) receives digital input signals and transmits digital input signals by the transmitting terminal of the second PWM controller (6), First end, third end and the 4th end of second PWM controller (6) connect with ADC (53) and by first end, third end and the 4th ends Analog signal be converted into corresponding digital signal, digital signal provides digitial controller (52) and generates digital PWM driving signal, The input terminal of pwm driver (51) receives digital PWM driving signal, and PWM driving generates analog drive signal and driven by PWM The output end of device (51) is transferred to the second end of the second PWM controller (6).
7. dedicated point of a kind of lithium battery according to claim 6 is filled device, it is characterised in that: use the second PWM controller (6) Digitial controller (52) realize the second control process realize constant pressure, constant current, synchronous rectification and line end compensation characteristic.
CN201910371666.0A 2019-05-06 2019-05-06 A kind of dedicated point of lithium battery is filled device CN110112920A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170214322A1 (en) * 2016-01-21 2017-07-27 Inno-Tech Co., Ltd. Isolated power conversion system
CN106992664A (en) * 2016-01-21 2017-07-28 产晶积体电路股份有限公司 Isolated power conversion system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170214322A1 (en) * 2016-01-21 2017-07-27 Inno-Tech Co., Ltd. Isolated power conversion system
CN106992664A (en) * 2016-01-21 2017-07-28 产晶积体电路股份有限公司 Isolated power conversion system

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