CN208424173U - A kind of converter feedback control circuit and the converter comprising the circuit - Google Patents
A kind of converter feedback control circuit and the converter comprising the circuit Download PDFInfo
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- CN208424173U CN208424173U CN201820743289.XU CN201820743289U CN208424173U CN 208424173 U CN208424173 U CN 208424173U CN 201820743289 U CN201820743289 U CN 201820743289U CN 208424173 U CN208424173 U CN 208424173U
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Abstract
The utility model provides a kind of feedback control circuit and the converter comprising the circuit, and feedback control circuit includes: n sub- feedback units and ranking operation unit, and n is the natural number of > 1；Each sub- feedback unit includes a feedback input end and a disturbing signal end；Ranking operation unit includes n signal input part and a signal output end, and each sub- feedback unit corresponds to the output voltage on each road for acquiring converter, and exports sampled voltage to each corresponding signal input part of ranking operation unit；Ranking operation unit is for being weighted summation to each sampled voltage, and output feedback ontrol amount is to the control terminal of main power circuit unit, the utility model inputs primary side altogether by using ranking operation unit and transformer, and the mode of isolation feedback, so that realizing that pressure stabilizing exports between mutually isolated multichannel respectively, mutually isolated multiple output converter can be improved per voltage accuracy all the way, load regulation, and the Ripple Noise of bypass output can be improved.
Description
Technical field
The utility model relates to the feedback control of converter, in particular to the converter of mutually isolated multiple-channel output it is anti-
Feedback control.
Background technique
Currently, widely applied Switching Power Supply topology mainly have single-ended flyback, single-ended forward type, semibridge system, full-bridge type,
The types such as push-pull type.Multiple-output electric power mostly uses greatly wherein to be fed back as main road all the way, and other for bypass output work
Make in open loop situations.Bypass output open loop be not meant to no pressure stabilizing, only in the form of increasing TVS pipe and fictitious load and
It goes to export bypass by the coupling of transformer and carries out pressure stabilizing.Since bypass is unlike main road, bypass has lacked accurate steady
Monitoring of the potential source to output, therefore the load regulation of bypass and voltage accuracy cannot all be guaranteed.When main road exports heavy duty
And bypass exports at light load, and bypass output voltage can be increased because actual duty cycle is bigger than the duty ratio that own needs.
Conversely, when main road output underloading and bypass output when overloaded, bypass output voltage can reduce.Therefore, when the load of main and side road becomes
The output voltage variation range of bypass can be made to broaden when changing bigger, even more so that the next stage circuit of bypass output cannot be just
Often work.Although the thought that the disturbing signal of multiple-channel output is weighted early is suggested, all apply in multiple-channel output
Altogether the case where, can not then improve the adjustment of load of bypass output for mutually isolated multiple-channel output using the prior art
Rate and voltage accuracy.
Utility model content
In view of this, the present invention provides a kind of feedback control circuit and include the converter of the circuit, the feedback control
Circuit processed can solve the load regulation difference of above-mentioned traditional technology and the problem of voltage accuracy difference, reduce the variation model of output voltage
It encloses, so that mutually isolated multiple output converter bypass output is more stable.
To achieve the above object, the utility model provides a kind of converter feedback control circuit, comprising: n sub- feedbacks
Member and ranking operation unit, n are the natural number of > 1；Each sub- feedback unit includes a feedback input end and a disturbance letter
Number end；Ranking operation unit includes n signal input part and a signal output end；Each sub- feedback unit is for acquiring converter
The output voltage on corresponding each road, and sampled voltage is exported to each corresponding signal input part of ranking operation unit；Ranking operation list
Member is for being weighted summation, and output feedback ontrol amount to each sampled voltage.
As a kind of specific embodiment of each sub- feedback unit, including a precision voltage regulator, a photoelectric coupling
Device and four resistance；One end of second resistance connects the output ground on corresponding road by third resistance；Second resistance it is another
End is connected by the light-emitting diodes tube anode of first resistance and photoelectrical coupler；The cathode of the light emitting diode of photoelectrical coupler
It is connect with the cathode of precision voltage regulator；The anode of precision voltage regulator connects the output ground on corresponding road；The control terminal of precision voltage regulator with
Second resistance is connected with the public even node of third resistance；The common connection node of first resistance and second resistance is made
For the feedback input end of the sub- feedback unit；The collector of the phototriode of photoelectrical coupler and a reference voltage source connect
It connects；The emitter of the phototriode of photoelectrical coupler is by the 4th resistance with connecing input and with emitter and the 4th resistance
Disturbing signal end of the common connection node as the sub- feedback unit.
As a kind of specific embodiment of ranking operation unit, including an in-phase adder and a triode,
The non-inverting input terminal of in-phase adder is used as each signal input part of ranking operation unit, the anti-phase input of in-phase adder simultaneously
Termination input ground, the base stage of the output end connecting triode of in-phase adder, the emitter of triode connect input ground, triode
Signal output end of the collector as ranking operation unit.
As a kind of specific embodiment of in-phase adder, including an operational amplifier and 4+n resistance, son is anti-
The signal disturbance end 1 of feedback unit 1 is connected by the 1st resistance with the non-inverting input terminal of operational amplifier ... ..., sub- feedback unit
The signal disturbance end n of n is connected by n-th resistance with the non-inverting input terminal of operational amplifier；1st resistance is to n-th resistance
Common connection node by (n+1)th resistance connect input ground；The inverting input terminal of operational amplifier is connect by the n-th+2 resistance
Input ground；The output end of operational amplifier is connected by the n-th+3 resistance with the base stage of triode；The output end of operational amplifier
Connected by the n-th+4 resistance with the inverting input terminal of operational amplifier.
The utility model provides the converter comprising above-mentioned feedback control circuit are as follows: the feedback input end of each sub- feedback unit
It is connected with each output end of converter main power circuit unit one-to-one correspondence, the signal output end of ranking operation unit and main power
The control terminal of circuit unit is connected.
The utility model design of the utility model is as follows:
With traditional technology only to output carries out closed loop feedback all the way compared with, it is provided by the utility model mutually isolated more
Road exports feedback system, is the disturbing signal all output roads in a manner of ranking operation, carries out closed loop feedback.Per defeated all the way
Agitation error out, which is weighted, obtains the feedback control amount for including each road feedback information after summation, and the feedback control amount is defeated
Out to the controller of main power circuit unit, the controller output of main power circuit unit enables to all obtain per all the way corresponding
The higher pwm signal of accuracy.All output roads can be monitored as the main road of above-mentioned traditional technology.Cause
This, the load regulation and voltage accuracy on all output roads have obtained certain guarantee.
Term is explained:
Weighted sum: if the power of n several x1, x2 ... ..., xn be respectively k1, k2 ..., kn, then x1*k1+x2*k2
+ ...+xn*kn is just called the weighted sum of this n number, and n is the natural number of > 1, and k1 to kn is positive number, k1 in the application
1 can be greater than to the sum of kn.
The utility model by using ranking operation unit and transformer input primary side altogether and multiple optocouplers carry out every
Mode from feedback, so that realizing that pressure stabilizing exports between mutually isolated multichannel respectively.
The utility model has the following beneficial effects: 1) mutually isolated multiple output converter can be improved per voltage essence all the way
Degree, load regulation；2) Ripple Noise of bypass output can be improved.
Detailed description of the invention
Fig. 1 is that the feedback control circuit of the utility model connects block diagram；
Fig. 2 is the isolated form two-way output translator comprising the utility model feedback control circuit based on single-ended reverse exciting topology
Circuit diagram；
Fig. 3 is the schematic diagram of in-phase adder.
Specific embodiment
Feedback control circuit shown in fig. 1 for the utility model connects block diagram, which includes: sub- feedback
Unit 1 is to self feed back unit n and ranking operation unit；Sub- feedback unit 1 includes feedback input end 1 and disturbing signal end
1 ... ..., sub- feedback unit n include feedback input end n and disturbing signal end n；Ranking operation unit include signal input part 1 to
Signal input part n and a signal output end；The feedback input end of each sub- feedback unit is used for and converter main power circuit
The output end 1 of unit is corresponded to output end n to be connected, and the disturbing signal end of each sub- feedback unit is each with ranking operation unit
Signal input part, which corresponds, to be connected, and the signal output end of ranking operation unit is for the control terminal phase with main power circuit unit
Even.
For a clearer understanding of the technical features, objectives and effects of the utility model, existing with single-ended reverse exciting two
Road output circuit is as embodiment explanation.
Fig. 2 shows export to become based on the isolated form two-way of single-ended reverse exciting topology comprising the utility model feedback control circuit
The functional block diagram of parallel operation, it then follows the first output road is now named as the output road a, the second output road life by the connection relationship of above-mentioned Fig. 1
The entitled road output b.
The control module of above-mentioned single-ended reverse exciting two-way output translator uses general controller, such as can be used
The controller of the model ISL6840 of Intersil company, and (voltage of the foot is able to achieve the feedback control foot of control module
Control duty ratio) control terminal of the extraction as main power circuit unit.
Fig. 2 includes two-way output a, b and two sub- feedback units；The sub- feedback unit being connected with output end a is named as
Sub- feedback unit a, the sub- feedback unit being connected with output end b are named as sub- feedback unit b；The road a is exported by output end a and ground
GND-1 exports the road voltage, and the output of the road b exports the road voltage by output end b and ground GND-2.
Sub- feedback unit a includes a precision voltage regulator U1a, a photoelectrical coupler OCaIt is electricity respectively with four resistance
Hinder R1a、R2a、R3aAnd R4a.Wherein, resistance R2aOne end pass through resistance R3aIt is grounded GND-1；Resistance R2aThe other end pass through resistance
R1aWith photoelectrical coupler OCaLight-emitting diodes tube anode connection.Photoelectrical coupler OCaLight emitting diode cathode and precision it is steady
Potential source U1aCathode connection.Precision voltage regulator U1aPlus earth GND-1.Precision voltage regulator U1aControl terminal and resistance R2aWith
Resistance R3aIt is public even node connection.Resistance R1aWith resistance R2aFeed back input of the common connection node as sub- feedback unit a
A is held, and is connect with output end a；Photoelectrical coupler OCaPhototriode collector and a reference voltage source VrefConnection；
Photoelectrical coupler OCaPhototriode emitter pass through resistance R4aIt is grounded and with emitter and resistance R4aCommonly connected section
Point is used as disturbing signal end a.
Sub- feedback unit b is similar with sub- feedback unit a, including a precision voltage regulator U1b, a photoelectrical coupler OCbWith
Four resistance are resistance R respectively1b、R2b、R3b、R4b.Wherein, resistance R2bOne end pass through resistance R3bIt is grounded GND-2；Resistance R2b
The other end pass through resistance R1b and photoelectrical coupler OCbLight-emitting diodes tube anode connection.Photoelectrical coupler OCbLight-emitting diodes
The cathode and precision voltage regulator U of pipe1bCathode connection.Precision voltage regulator U1bPlus earth GND-2.Precision voltage regulator U1b's
Control terminal and resistance R2bWith resistance R3bIt is public even node connection.Resistance R1bWith resistance R2bCommon connection node it is anti-as son
The feedback input end b of unit b is presented, and is connect with output end b；Photoelectrical coupler OCbPhototriode collector and one
Reference voltage source VrefConnection；Photoelectrical coupler OCbPhototriode emitter pass through resistance R4bBe grounded and with emitter with
Resistance R4bCommon connection node as disturbing signal end b.
Ranking operation unit is by in-phase adder and a triode Q2Composition.In-phase adder includes an operation amplifier
Device U2It is resistance R respectively with six resistance5、R6、R7、R8、R9、R10.Wherein, the signal disturbance end a of sub- feedback unit a passes through electricity
Hinder R6With operational amplifier U2Non-inverting input terminal connect；The signal disturbance end b of sub- feedback unit b passes through resistance R5It is put with operation
Big device U2Non-inverting input terminal connect；Resistance R6With resistance R5Common connection node pass through resistance R7It is grounded GND.Operation amplifier
Device U2Inverting input terminal pass through resistance R8It is grounded GND.Operational amplifier U2Output end pass through resistance R9With triode Q2Base
Pole connects.Operational amplifier U2Output end pass through resistance R10With operational amplifier U2Inverting input terminal connect.Triode Q2's
Emitter is grounded GND.Triode Q2Collector as ranking operation unit signal output end and with the feedback of control module
Foot is controlled, i.e. the control terminal of main power circuit unit connects.
It is as follows to tell about its course of work for physical circuit as shown in connection with fig. 2:
After converter powers on, the voltage on the output road a is gradually increasing, and passes through sampling resistor R2a、R3aAfter being sampled, input
Precision voltage regulator U1aIn.Voltage and precision voltage regulator U after sampling1aInternal reference level is compared, so that accurate steady
Potential source U1aCathode potential change, change the electric current I by the light emitting diode of optocoupler OCaca.Therefore, pass through optocoupler
The electric current of the inside phototriode of OCa equally changes, so that R4aPressure drop change, formula one hereafter can be passed through
Obtain the agitation error u that the road a is exported described in working principleca.Agitation error ucaBy resistance R6 enter in-phase adder U2 into
Row ranking operation.
After converter powers on, correspondingly, the voltage on the output road b is gradually increasing, pass through sampling resistor R2b、R3bIt is sampled
Afterwards, precision voltage regulator U is inputted1bIn.Voltage and precision voltage regulator U after sampling1bInternal reference level is compared, and is made
Obtain precision voltage regulator U1bCathode potential change, pass through change optocoupler OCb light emitting diode electric current Icb.Therefore, lead to
The electric current for crossing the inside phototriode of optocoupler Ocb equally changes, so that R4bPressure drop change, can be by hereafter
The agitation error u on the output road b is calculated in formula twocb.Agitation error ucbPass through resistance R5Added into in-phase adder U2
Weigh operation.
Assuming that optocoupler OCa, OCb are same model, and current transfer ratio is all k, is flowed in the light emitting diode of optocoupler OCa
The current variation value crossed is Δ Ica, the current variation value flowed through in the light emitting diode of optocoupler OCa is Δ Icb。
Then have:
uca=k △ Ica... ... ... ... ... .. formula one
ucb=k △ Icb... ... ... ... ... .. formula two
As shown in figure 3, according to the available following formula of circuit theory of in-phase adder:
According to formula three, resistance R5、R6、R7Value design will affect output the road a, the road b agitation error weight ratio
Example.Resistance R8、R10Then influence the output voltage amplitude size of amplifier.The output voltage u of amplifiercontrolPass through resistance R9It is added to three
The base stage of pole pipe Q2 directly controls triode Q2 base current, influences the electric current between triode Q2 collector and emitter.Three
The function of current between pole pipe Q2 collector and emitter influences feedback control foot level magnitude in controller feedback control foot；
Controller controls duty ratio size according to feedback control foot level magnitude, and then controls output voltage, guarantees per output all the way
Voltage accuracy.
Although the utility model has been disclosed with preferred embodiment as above, it is not intended to limit the utility model, this reality
It can be made various without departing from the spirit and scope of the utility model of novel those of ordinary skill in the art
Change and retouch.Therefore, the protection scope of the utility model is at that time subject to those as defined in claim.
Claims (4)
1. a kind of converter feedback control circuit, it is characterised in that: include: n sub- feedback units and ranking operation unit, n are
The natural number of > 1；Each sub- feedback unit includes a feedback input end and a disturbing signal end；Ranking operation unit includes
N signal input part and a signal output end；Each sub- feedback unit is used to acquire the output voltage that converter corresponds to each road, and
Sampled voltage is exported to each corresponding signal input part of ranking operation unit；Ranking operation unit is used to carry out each sampled voltage
Weighted sum, and output feedback ontrol amount；One kind of each sub- feedback unit includes a precision voltage regulator, a photoelectrical coupler
With four resistance；One end of second resistance connects the output ground on corresponding road by third resistance；The other end of second resistance
It is connected by the light-emitting diodes tube anode of first resistance and photoelectrical coupler；The cathode of the light emitting diode of photoelectrical coupler with
The cathode of precision voltage regulator connects；The anode of precision voltage regulator connects the output ground on corresponding road；The control terminal of precision voltage regulator and the
Two resistance are connected with the public even node of third resistance；The common connection node conduct of first resistance and second resistance
The feedback input end of the sub- feedback unit；The collector of the phototriode of photoelectrical coupler is connect with a reference voltage source；
The emitter of the phototriode of photoelectrical coupler by the 4th resistance connects input ground and with emitter and the 4th resistance
Disturbing signal end of the common connection node as the sub- feedback unit.
2. feedback control circuit according to claim 1, it is characterised in that: ranking operation unit includes a same additive process
Device and a triode, the non-inverting input terminal of in-phase adder are used as each signal input part of ranking operation unit, same phase simultaneously
The anti-phase input termination input ground of adder, the base stage of the output end connecting triode of in-phase adder, the emitter of triode
Connect input ground, signal output end of the collector of triode as ranking operation unit.
3. feedback control circuit according to claim 1, it is characterised in that: in-phase adder includes an operational amplifier
With 4+n resistance, the signal disturbance end 1 of sub- feedback unit 1 passes through the non-inverting input terminal phase of the 1st resistance and operational amplifier
It connects ... ..., the signal disturbance end n of sub- feedback unit n is connected by n-th resistance with the non-inverting input terminal of operational amplifier；1st
The common connection node of resistance to n-th resistance connects input ground by (n+1)th resistance；The inverting input terminal of operational amplifier
Input ground is connect by the n-th+2 resistance；The output end of operational amplifier is connected by the n-th+3 resistance with the base stage of triode；
The output end of operational amplifier is connected by the n-th+4 resistance with the inverting input terminal of operational amplifier.
4. a kind of converter comprising any one of claims 1 to 3 feedback control circuit, it is characterised in that: each sub- feedback unit
Each output end one-to-one correspondence of feedback input end and converter main power circuit unit be connected, the signal of ranking operation unit is defeated
Outlet is connected with the control terminal of main power circuit unit.
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| CN201820743289.XU CN208424173U (en) | 2018-05-17 | 2018-05-17 | A kind of converter feedback control circuit and the converter comprising the circuit |
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| CN201820743289.XU CN208424173U (en) | 2018-05-17 | 2018-05-17 | A kind of converter feedback control circuit and the converter comprising the circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429432A (en) * | 2018-05-17 | 2018-08-21 | 广州金升阳科技有限公司 | A kind of converter feedback control circuit and the converter comprising the circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429432A (en) * | 2018-05-17 | 2018-08-21 | 广州金升阳科技有限公司 | A kind of converter feedback control circuit and the converter comprising the circuit |
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