CN106992664B - Isolated power conversion system - Google Patents

Isolated power conversion system Download PDF

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Publication number
CN106992664B
CN106992664B CN201610039679.4A CN201610039679A CN106992664B CN 106992664 B CN106992664 B CN 106992664B CN 201610039679 A CN201610039679 A CN 201610039679A CN 106992664 B CN106992664 B CN 106992664B
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China
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end
signal
pwm
output
pwm controller
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CN201610039679.4A
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Chinese (zh)
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CN106992664A (en
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林树嘉
林敬渊
谢文岳
林志峰
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产晶积体电路股份有限公司
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Abstract

The present invention is a kind of isolated power conversion system, include rectification unit, transformer, switching transistor, the first pulse width modulation (Pulse Width Modulation, PWM) controller, the second PWM controller, output unit and isolation signals unit, to provide the isolated power source conversion function that input ac power is converted into output DC power supply.Especially, the connecting interface between the first PWM controller and the second PWM controller is formed using isolation signals unit, and signal in digital form and communicate, ability with the interference of stronger interference resistant, the stability that piece electrical operation can be improved, avoids malfunctioning, and then reinforces the stability of power supply conversion, ensure whole electric signal quality simultaneously, uses and solve above-mentioned problem of the prior art.

Description

Isolated power conversion system

Technical field

The present invention about a kind of dynamic driving capacity adjustment power control, especially in primary side or secondary Digital pulse width modulation (PWM) controller is respectively configured in side, and carries out preset power supply according to actual needs and control function Can, and can mutually Phase Receiver, send digital signal, and digital signal can produce after processing for detecting voltage, the electric current of secondary side Life simultaneously further passes primary side back, uses the switching transistor of control primary side, or primary side is brilliant to control switching electricity The reversed pwm signal of the signal of body passes to secondary side and synchronously control switching transistor reinforces the stability that power supply is converted in turn, Ensure whole electric signal quality simultaneously.

Background technique

Different electronic products needs the power supply of different voltages or electric current and operates, for example, integrated circuit (IC) needs 5V Or 3V, it is electric that electric motor needs 12V DC, and the fluorescent tube in liquid crystal display needs the power supply of more high pressure, such as 1150V.Therefore, Needed for needing different electrical power converter to meet, so that power converter topology increasingly flourishes, belong in electronic industry quite An important ring.

In general, power converter topology can be roughly divided into isolated and non-isolated two class power supplys conversion, interval It is to keep apart power input and load end from the conversion of formula power supply, can avoid input power and damaged when being abnormal surging The equipment of load end, thus safety in utilization with higher, and circuit design is relatively simple, and opposite, it is non-isolated because Have it is for security consider, so particularly severe on electric apparatus safety specification.

With reference to Fig. 1, the schematic diagram of isolated power converter in the prior art, wherein AC power source VAC is through appropriate whole After stream, filtering, it is sent to the first siding ring of transformer TR, and driving the drain end of switching transistor Q1 is to be connected to primary side Coil, the source terminal of driving switching transistor Q1 is that connection senses resistance and generates sensing signal, in addition, transformer TR's is secondary Lateral coil generates induced voltage by the conducting electric current of induction first siding ring, and generates after the filtering of output unit, rectification Out-put supply Vo, with the load outside supply.

Especially, PWM shape is generated using pulse width modulation (Pulse Width Modulation, PWM) controller U1 The driving signal of formula drives switching transistor Q1's to play open and close to control the gate terminal for driving switching transistor Q1, and then control Closed operation.Furthermore photo-coupler U2 connection output unit, generate feedback signal and be sent to PWM controller U1, thus reach every Function from the conversion of formula power supply.

With further reference to Fig. 2, the schematic diagram of another isolated power converter, is generally analogous to figure in the prior art 1 isolated power converter generates feedback signal also with photo-coupler U2 to be supplied to PWM controller U1, but Fig. 2 Isolated power converter further use constant voltage constant current control device U3, to the light-emitting diode to multiple concatenations (LED) load of lamp string composed by, implements the control of constant voltage and/or constant current, uses the luminescent quality of holding LED simultaneously Extend and uses life time.

It will be apparent that above-mentioned disadvantage of the prior art is that feedback signal caused by photo-coupler U2 belongs to analogy letter Number, it is easy to by the interference of external electrical noise, i.e. interference resistant ability is bad, seriously affects the stabilization of piece electrical operation Property.

Hence it is highly desirable to which a kind of power control, forms the first PWM controller and second using isolation signals unit Connecting interface between PWM controller, and signal in digital form and communicate, the ability with the interference of stronger interference resistant, The stability that piece electrical operation can be improved, avoids malfunctioning, and then reinforces the stability of power supply conversion, while ensuring whole Electric signal quality is used and solves above-mentioned problem of the prior art.

Summary of the invention

The main purpose of the present invention is to provide a kind of isolated power conversion systems, to provide input ac power It is converted into the isolated power source conversion function of output DC power supply, includes rectification unit, transformer, switching transistor, the first arteries and veins Rush width modulation (Pulse Width Modulation, PWM) controller, the second PWM controller, output unit and isolation letter Number unit, wherein AC power source can be converted into DC power supply by rectification unit.

Specifically, transformer includes first siding ring, ancillary coil and second siding ring, wherein first siding ring is connect DC power supply is received, ancillary coil can generate auxiliary induction electric current by the electric current of induction first siding ring, and auxiliary induction electric current It flows through series resistor and generates auxiliary signal, and second siding ring is to generate induced electricity by the electric current of induction first siding ring Stream.

Switching transistor has drain end, gate terminal and source terminal, and wherein drain end is connected to first siding ring, source electrode End is connected to one end of sensing resistance, and senses the other end of resistance for ground connection, in addition, generating sensing signal by source terminal.

Furthermore output unit includes output transistor, output diode and output capacitance.The positive terminal for exporting diode connects The drain of output transistor and one end of output capacitance are connect, and exports the source of the negative pole end connection output transistor of diode Pole, the other end of output capacitance connect second siding ring, and by output capacitance bridging load to provide out-put supply, negative to supply It carries.

More specifically, the first PWM controller have first end, second end, third end, the 4th end, transmitting terminal with And receiving end, wherein first end is to suspend, and second end is the gate terminal for being driven series resistor and being connected to switching transistor, the Three ends receive auxiliary signal, and the 4th end can be connected to the source terminal of switching transistor through sensing series resistor, to receive source Extreme sensing signal.

In addition, the second PWM controller has the framework of similar first PWM controller, also comprising first end, second end, the Three ends, one the 4th end, transmitting terminal and receiving end, but first end is the negative pole end of connection output diode, second end connection The gate of transistor, the positive terminal of third end connection output diode are exported, and the 4th end connects the load.

Isolation signals unit is used using the signal sensing winding of transformer as one or two two-way communication signals.

Especially, the first PWM controller carry out the first control processing according to the received sensing signal of institute, auxiliary signal and The driving signal of tool PWM characteristic is generated, then drives signals to the lock of switching transistor by the second end of the first PWM controller Transistor is extremely switched with driving, meanwhile, the first PWM controller generates the first digital output signal, and by the first PWM controller Transmitting terminal the receiving end of the second PWM controller is sent to through isolation signals unit.Furthermore the second PWM controller is according to next From the first end of the second PWM controller, third end, the 4th end and the electric signal of receiving end to be handled into one second control, And then secondary side adjustment signal is generated, and the gate of output transistor is sent to by third end, while generating the second numeral output Signal, and the receiving end of the first PWM controller is sent to by transmitting terminal through isolation signals unit.

Therefore, the first PWM controller and the second PWM controller are in digital form to the connecting interface of isolation signals unit Signal and communicate, with stronger interference resistant interference ability, can improve piece electrical operation stability.

Detailed description of the invention

Fig. 1 shows the schematic diagram of isolated power converter in the prior art.

Fig. 2 shows the schematic diagram of another isolated power converter in the prior art.

Fig. 3 shows the schematic diagram of the isolated power conversion system of the embodiment of the present invention.

Fig. 4 shows the function block schematic diagram of the first PWM controller in the embodiment of the present invention.

Fig. 5 shows exemplary operational waveforms figure of the invention.

Fig. 6 display present invention is using flyback framework as the circuit diagram of exemplary embodiment.

Wherein, the reference numerals are as follows:

10 rectification units

20 switching transistors

31 first PWM controllers

32 second PWM controllers

50 output units

60 isolation signals units

Co output capacitance

Do exports diode

FU EMI filter unit

IQ primary side conducting electric current

LAUX ancillary coil

LP first siding ring

LS second siding ring

P1 first end

P2 second end

P3 third end

The 4th end P4

Q1 driving switching transistor

Qo exports transistor

R1X series resistor

RCS senses resistance

RCX senses series resistor

RPWM drives series resistor

RL load

The receiving end RX

SR synchronous rectification signal

TR transformer

TRA transformer

TX transmitting terminal

U1 PWM controller

U2 photo-coupler

U3 constant voltage constant current control device

VAC AC power source

VAUX auxiliary signal

VCS sensing signal

VDC DC power supply

Vo out-put supply

VPWM driving signal

Specific embodiment

Cooperate schema and appended drawing reference to do more detailed description to embodiments of the present invention below, makes to be familiar with this field skill Art personnel can implement accordingly after studying this specification carefully.

Refering to Fig. 3, the schematic diagram of the isolated power conversion system of the embodiment of the present invention.As shown in figure 3, isolation of the invention Formula power conversion system mainly includes rectification unit 10, transformer TRA, switching transistor 20, the first pulse width modulation (Pulse Width Modulation, PWM) controller 31, the second PWM controller 32, output unit 50 and isolation signals list Member 60, to provide isolated power source conversion function.

Rectification unit 10 be externally input AC power source VAC is converted into DC power supply VDC, and it is noted that It is that general traditional bridge rectifier can be used in rectification unit 10, but is not limited thereto, that is, other patterns can also be used Rectifier.

Transformer TRA includes first siding ring LP, ancillary coil LAUX and second siding ring LS, wherein first siding ring LP is to be connected to rectification unit 10, and to receive DC power supply VDC, and ancillary coil LAUX incudes the electric current of first siding ring LP And auxiliary induction electric current is generated, and flow through series resistor R1X and generate auxiliary signal VAUX.In addition, second siding ring LS is by sense It answers the electric current of first siding ring LP and generates induced current, and be sent to output unit 50.

Furthermore switching transistor 20 has drain end, gate terminal and source terminal, and wherein drain end is connected to a side line LP is enclosed, and source terminal is connected to one end of sensing resistance RCS, and senses the other end of resistance RCS for ground connection, wherein sensing resistance RCS and the tie point of source terminal generate sensing signal VCS.

Output unit 50 includes output transistor Qo, output diode Do and output capacitance Co, wherein output diode Do Positive terminal connection output transistor Qo drain and output capacitance Co one end, and export diode Do negative pole end connection The source electrode of transistor Qo is exported, meanwhile, the second siding ring LS of the other end connection transformer TRA of output capacitance Co, and by defeated Capacitor Co bridging load RL out, to provide out-put supply Vo.Isolation signals unit 60 is to utilize the signal for being configured at transformer TRA Winding is sensed to use as one or two two-way communication signals.

Specifically, the first PWM controller 31 has first end P1, second end P2, third end P3, the 4th end P4, sends TX and receiving end RX is held, wherein first end P1 is to suspend, and second end P2 is connected to switching electricity through driving series resistor RPWM The gate terminal of crystal 20, third end P3 receive auxiliary signal VAUX, and the 4th end P4 is connected to switching through sensing series resistor RCS The source terminal of transistor 20.In addition, the second PWM controller 32 is similar to the first PWM controller 31, it may have first end P1, the Two end P2, third end P3, the 4th end P4, transmitting terminal TX and receiving end RX.But, the first end P1 of the second PWM controller 32 The negative pole end of connection output diode Do, second end P2 connection export the gate of transistor Qo, and the P3 connection of third end exports two poles The positive terminal of body Do, the 4th end P4 connection load RL.

First PWM controller 31 generates digital output signal in transmitting terminal TX, and is sent to through isolation signals unit 60 The receiving end RX of second PWM controller 32.Similar, the second PWM controller 32 generates digital output signal in transmitting terminal TX, And the receiving end RX of the first PWM controller 31 is sent to through isolation signals unit 60.Therefore, the first PWM controller 31 and Signal of two PWM controllers 32 to the connecting interface of isolation signals unit 60 to transmit digital form, reaches digital communication Purpose can substantially strengthen the ability of interference resistant.

Furthermore as shown in the function block schematic diagram of the first PWM controller 31 in Fig. 4, the first PWM controller 31 includes number Word controller 31A, pwm driver 31B and number to analogy converter ADC, noting however that, the second PWM controller 32 also have the identical function block of Fig. 5, and preferably, digitial controller 31A be by cooperation software formula or firmware formula and The central processing unit (CPU) of running or the digital electronic component of microcontroller (MCU) and realize.

Digitial controller 31A is electrically connected to pwm driver 31B and number to analogy converter ADC, wherein number control Device 31A processed receives the digital input signals from receiving end RX, and digital output signal is transmitted outward via transmitting terminal TX, and First end P1, third end P3, the 4th end P4 are connected to number to analogy converter ADC, will come from first end P1, third end P3, the 4th end P4 anaiog signal be converted into digital signal, use provide digitial controller 31 generate digital PWM driving signal, And received by the input terminal of pwm driver 31B, and then generate analogy driving signal, and second end P2 is sent to by output end.

Fig. 3 is returned, although the first PWM controller 31 and the function block having the same of the second PWM controller 32, but It is that different electric functions is provided individually in whole isolated power conversion system.Specifically, the first PWM controller 31 Major function be to generate driving signal VPWM to control the switching opening of transistor 20, shutoff operation, it is primary to use realization Side adjusts (Primary Side Regulation, PSR), and the auxiliary comprising receiving auxiliary sensing end AUX using third end P3 is believed Number VAUX receives sensing signal VCS using the 4th end P4 and detects the electric current of primary side to detect output voltage electric current, and produces It gives birth to the digital output signal of primary side status signal and is sent to isolation signals unit 60 through transmitting terminal TX.That is, the first PWM is controlled Device 31 is according to received sensing signal VCS, auxiliary signal VAUX to carry out the first control processing, and then generation tool PWM The driving signal VPWM of characteristic, then the gate terminal for switching transistor 20 is sent to by the second end P2 of the first PWM controller 31, by Switch transistor 20 with driving, meanwhile, the first PWM controller 31 generates the first digital output signal, and by the first PWM controller 31 transmitting terminal TX is sent to the receiving end RX of the second PWM controller 32 through isolation signals unit 60.

Furthermore the second PWM controller 32 can detect out-put supply Vo's using first end P1, third end P3, the 4th end P4 Voltage, electric current, use carry out voltage stabilization and current stabilization compensation control, can also detect cable because consume caused by pressure drop to compensate, That is line end compensation (Line-end compensation), and digital output signal is generated as digital feedback signal and through sending End TX is sent to isolation signals unit 60, and then is sent to the first PWM controller 31, forms feedback loop, replaces tradition in Fig. 1 On be recycled to using optical coupler primary side PWM controller the practice.Especially, the second PWM controller 32 can realize that tool is fixed The out-put supply Vo of voltage, constant current characteristic, while the dynamic load that can make up the first PWM controller 31 reacts slower and lacks Point.That is, the second PWM controller 32 can according to from the second PWM controller 32 first end P1, third end P3, the 4th end P4 and The electric signal of receiving end RX generates secondary side adjustment signal to carry out the second control processing, and is transmitted by third end P3 To output transistor Qo gate, while generate the second digital output signal, and by the transmitting terminal TX of the second PWM controller 32 pass through Isolation signals unit 60 and the receiving end RX for being sent to the first PWM controller 31.

Constant voltage, the constant current characteristic of second PWM controller 32 are particularly suitable for the charge and discharge control of battery, because filling The voltage at electric initial stage, general rechargeable battery is lower and needs first to carry out constant-current charge, and reaches most in the voltage of rechargeable battery When high level, constant-voltage charge is carried out, at this point, until charging current gradually can drop to zero.Therefore, the second PWM controller 32 can At charging initial stage, constant-current charge is carried out, and in voltage peak, constant-voltage charge is converted into, to meet actual requirement.

In addition, the second PWM controller 32 also may achieve synchronous rectification control (Synchronous rectifier Control function) can root when being included in progress continuous conduction mode (Continuous Conduction Mode, CCM) The synchronous rectification signal of the first PWM controller 31 is received according to receiving end RX, to determine the opening of switching transistor 20, close, into And reach synchronous rectification, and can at discontinuous conduction mode (Discontinuous Conduction Mode, DCM), According to the synchronous rectification signal of the first PWM controller 31 to determine that the Qo as synchronous rectification transistor exports beating for transistor It opens, conducting opportunity, and when the electric current of second siding ring LS drops to 0, closes Qo and export transistor.

Especially, the first PWM controller 31 and the second PWM controller 32 to the connecting interface of isolation signals unit 60 be with The signal of digital form and communicate, with stronger interference resistant interference ability, can improve piece electrical operation stability.

It is exemplary operation waveform diagram with reference to Fig. 5, wherein IQ is the conducting electric current of first siding ring PL, supplemented by IDOUT The conducting electric current of index contour circle LAUX, tON are the opening time of first siding ring PL, and tOFF is the time that IDOUT is not zero, and tS For the cycle time of driving signal VPWM.In addition, synchronous rectification signal SR system carrys out the receiving end RX in the first PWM controller 31.

The synchronous rectification of above-mentioned second PWM controller 32 can reduce the loss that Do on secondary side exports diode, into And it promotes power supply and changes efficiency.

By taking the circuit of flyback (flyback) framework as an example, as shown in fig. 6, isolation signals unit 60 of the invention is available The mode of signal sensing winding and be configured at transformer TRA, that is, entire transformer TRA can be to include first siding ring LP, auxiliary The single device of coil LAUX, second siding ring LS and signal sensing winding can simplify the design of piece electrical connection line, Cost of manufacture is reduced, and improves electric signal quality.

In conclusion the main characteristic of the invention lies in that providing, there is first and second PWM of identical function square to control The isolated power conversion system of device, and first and second PWM controller is connected using isolation signals unit, especially first and Two PWM controllers are communicated in a manner of digital signal by isolation signals unit, and constant voltage, constant current function can be implemented, It is highly suitable to be applied for the field of battery charging and discharging, and Active PFC (Power Factor can also be provided Correction, PFC), for reducing or eliminate virtual work, to improve transfer efficiency.

Due to the interface digital signaling between the first, second PWM controller and isolation signals unit, so having anti- Noise characteristic, can ensure that the operation of default electric function, improve overall isolation formula power conversion system operational stability and can By degree.In particular, present invention can be suitably applied to different forward directions, flyback, full-bridge, half-bridge, boosting, decompression circuit framework, can expand and answer With field, quite there are industry applications.

The foregoing is merely to explain presently preferred embodiments of the present invention, it is not intended to do any form to the present invention accordingly On limitation, therefore, it is all have make any modification or change for the present invention under identical spirit, all should include The invention is intended to the scopes of protection.

Claims (4)

1. a kind of isolated power conversion system characterized by comprising
One rectification unit, an AC power source is converted into a DC power supply;
One transformer includes a first siding ring, an ancillary coil and a second siding ring, and it is straight which receives this Galvanic electricity source, the ancillary coil generate an auxiliary induction electric current by the electric current for incuding the first siding ring, and auxiliary induction electricity Stream flows through a series resistor and generates an auxiliary signal, which generates one by the electric current for incuding the first siding ring Induced current;
One switching transistor, has a drain end, a gate terminal and source-side, which is connected to a side line Circle, and the source terminal is connected to one end of a sensing resistance, and an other end of the sensing resistance is ground connection, which generates One sensing signal;
One output unit, including an output transistor, an output diode and an output capacitance, the positive terminal of the output diode The drain of the output transistor and one end of the output capacitance are connected, and the negative pole end of the output diode connects output electricity The source electrode of crystal, an other end of the output capacitance connect the second siding ring, and by output capacitance bridging load to provide One out-put supply, with one load of supply;
One first PWM controller connects with a first end, a second end, a third end, one the 4th end, a transmitting terminal and one Receiving end, the first end are to suspend, which is connected to the gate terminal of the switching transistor through a driving series resistor, this Three ends receive the auxiliary signal, the 4th end one sensing series resistor and the source terminal for being connected to the switching transistor, to Receive the sensing signal of the source terminal;
One second PWM controller connects with a first end, a second end, a third end, one the 4th end, a transmitting terminal and one Receiving end, the first end connect the negative pole end of the output diode, which connects the gate of the output transistor, the third end The positive terminal of the output diode is connected, and the 4th end connects the load;And
One isolation signals unit is using being configured at a signal sensing winding of the transformer to believe as one or two two-way communications Number use,
Wherein first PWM controller is according to the received sensing signal of institute, the auxiliary signal, to carry out one first control processing And a driving signal of tool PWM characteristic is generated, then the driving signal is transmitted to the switching by the second end of first PWM controller The gate terminal of transistor is to drive the switching transistor, while first PWM controller generates one first digital output signal, and The receiving end of second PWM controller is sent to through the isolation signals unit by the transmitting terminal of first PWM controller, this Electricity of two PWM controllers according to the first end, the third end, the 4th end and the receiving end from second PWM controller Gas signal generates a secondary side adjustment signal, and be sent to the output by the second end to carry out one second control processing The gate of transistor, while one second digital output signal is generated, and be sent to through the isolation signals unit by the transmitting terminal The company of the receiving end of first PWM controller, first PWM controller and second PWM controller to the isolation signals unit Connecing interface is signal in digital form and communicates,
First PWM controller includes that a digitial controller, a pwm driver and one are digital to analogy converter, the number Controller is the number electricity by the central processing unit or a microcontroller operated with unification software formula or a firmware formula Subcomponent and realize, which is electrically connected to the pwm driver and the number to analogy converter, number control Device processed receives the digital input signals from the receiving end, and the digital output signal is transmitted outward via the transmitting terminal, and The first end of first PWM controller, the third end, the 4th end are to be connected to the number to analogy converter, in the future It is converted into a digital signal from the anaiog signal at the first end, the third end, the 4th end, uses and digitial controller production is provided Raw digital PWM driving signal, and being received by the input terminal of the pwm driver, so generate an analogy driving signal and by the PWM The output end of driver is sent to the second end.
2. isolated power conversion system according to claim 1, which is characterized in that the number of first PWM controller Controller reaches Active PFC (Power Factor Correction, PFC) to realize that first control is handled And/or the characteristic of LLC.
3. isolated power conversion system according to claim 1, which is characterized in that second PWM controller includes one Digitial controller, a pwm driver and one number to analogy converter, the digitial controller be by with unification software formula or One firmware formula and the digital electronic component of a central processing unit or a microcontroller that operates and realize, digitial controller electricity Gas is connected to the pwm driver and the number to analogy converter, which receives the number from the receiving end Input signal, and the digital output signal is transmitted outward via the transmitting terminal, and the first end of second PWM controller, should Third end, the 4th end are to be connected to the number to analogy converter, will come from the first end, the third end, the 4th The anaiog signal at end is converted into a digital signal, uses and provides digitial controller generation digital PWM driving signal, and by this The input terminal of pwm driver receives, so generate an analogy driving signal and by the output end of the pwm driver be sent to this Two ends.
4. isolated power conversion system according to claim 3, which is characterized in that the number of second PWM controller Controller reaches constant voltage, constant current, the characteristic of synchronous rectification to realize that second control is handled.
CN201610039679.4A 2016-01-21 2016-01-21 Isolated power conversion system CN106992664B (en)

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CN110112920A (en) * 2019-05-06 2019-08-09 杭州里德通信有限公司 A kind of dedicated point of lithium battery is filled device

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CN101277068A (en) * 2008-02-21 2008-10-01 崇贸科技股份有限公司 Synchronization regulation power supply convertor and synchronization regulation circuit
TW201006111A (en) * 2008-07-18 2010-02-01 Spi Electronic Co Ltd Flyback circuit having synchronous control
CN102185483A (en) * 2011-05-09 2011-09-14 广州金升阳科技有限公司 Synchronous rectification driving circuit of flyback converter
CN102291000A (en) * 2011-08-29 2011-12-21 上海新进半导体制造有限公司 Switching power supply IC
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CN203691245U (en) * 2013-12-31 2014-07-02 西安理工大学 Synchronous rectifier controller used for flyback converter
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