CN209046531U - A kind of loop compensation circuit of voltage control isolated form DC/DC converter - Google Patents
A kind of loop compensation circuit of voltage control isolated form DC/DC converter Download PDFInfo
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- CN209046531U CN209046531U CN201822053102.6U CN201822053102U CN209046531U CN 209046531 U CN209046531 U CN 209046531U CN 201822053102 U CN201822053102 U CN 201822053102U CN 209046531 U CN209046531 U CN 209046531U
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Abstract
The utility model relates to a kind of loop compensation circuits of voltage control isolated form DC/DC converter, including isolation compensating unit circuit and loop compensation unit circuit；The loop compensation unit circuit, the dual pole generated for offset voltage control isolated form main power circuit link and high frequency zero, and promote static gain；The isolation compensating unit circuit for primary and secondary circuit to be isolated, while compensating optical coupling isolator parasitic parameter bring pole, reduces its adverse effect to power supply control loop.The utility model can not only make control circuit realize primary and secondary electrical isolation, but also can compensate the DC/DC converter main power circuit of such as voltage-controlled type PWM mode, can also compensate for the influence by isolation optocoupler bring high frequency poles to loop gain.
Description
Technical field
The utility model relates to a kind of compensation circuits, and in particular to a kind of ring of voltage control isolated form DC/DC converter
Road compensation circuit.
Background technique
Conventional loop compensation single channel and isolation compensation circuit is by voltage control signal input controller, outside controller
The parasitic capacitance in portion will lead to lower parasitic poles, about 10kHz or so, this will seriously affect the bandwidth and phase of power-supply system
Nargin, to limit the dynamic response and stability of power supply.
Utility model content
The purpose of this utility model is to provide a kind of voltage control isolated form DC/DC converter loop compensation circuit,
Not only control circuit can have been made to realize primary and secondary electrical isolation, but also the DC/DC change of such as voltage-controlled type PWM mode can be compensated
Parallel operation main power circuit can also compensate for the influence by isolation optocoupler bring high frequency poles to loop gain.
To achieve the above object, the utility model uses following technical scheme:
A kind of loop compensation circuit of voltage control isolated form DC/DC converter, including isolation compensating unit circuit and ring
Road compensating unit circuit；
The loop compensation unit circuit, the dual pole generated for offset voltage control isolated form main power circuit link
Point and high frequency zero, and promote static gain；
The isolation compensating unit circuit for primary and secondary circuit to be isolated, while compensating optical coupling isolator parasitism ginseng
Number bring pole, reduces its adverse effect to power supply control loop.
As a further improvement of the above technical scheme:
Including operational amplifier N1, resistance R1, R2, R3, R4 and capacitor C1, C2, C3, one end of the resistance R1 is through capacitor
C1 is connect with the inverting input terminal of operational amplifier N1, and the other end of resistance R1 is connect with power output end, and the resistance R2 is simultaneously
The both ends of resistance R1 Yu capacitor C1 are associated in, one end of resistance R3 is connect with the inverting input terminal of operational amplifier N1, resistance R3's
Other end ground connection, one end of resistance R4 are connect with the output end of operational amplifier N1, and the other end of resistance R4 is through capacitor C3 and fortune
The connection of amplifier N1 inverting input terminal is calculated, above-mentioned capacitor C2 is connected in parallel on the both ends of resistance R4 Yu capacitor C3.
The isolation compensating unit circuit includes photoelectrical coupler N2, resistance R5, current-limiting resistance R6, capacitor C4 and filtered electrical
Hold C5, one end of the resistance R5 is connect with the diode output of photoelectrical coupler N2, the other end and loop compensation circuit
Output end connection, the capacitor C4 is connected in parallel on the both ends of resistance R5, and one end of the resistance R6 is connect with DC power supply VCC2,
Its other end is connect with the diode input terminal of photoelectrical coupler N2, the triode input terminal and PWM of the photoelectrical coupler N2
The end the REF connection of chip is controlled, the transistor output of photoelectrical coupler N2 and the end COMP of pwm chip connect, described
The one end filter capacitor C5 and the end REF of pwm chip connect, the other end ground connection of filter capacitor C5.
As shown from the above technical solution, the loop of voltage control isolated form DC/DC converter described in the utility model is mended
Circuit is repaid, the two-stage compensation circuit based on loop compensation unit circuit and isolation compensating unit circuit can both make control circuit
It realizes primary and secondary electrical isolation, and the DC/DC converter main power circuit of such as voltage-controlled type PWM mode can be compensated,
It can also compensate for the influence by isolation optocoupler bring high frequency poles to loop gain.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model；
Fig. 2 is the circuit block diagram of voltage control isolated form DC/DC converter in the utility model embodiment；
Fig. 3 is semibridge system isolated form DC/DC converter circuit block diagram in the utility model embodiment.
Specific embodiment
The utility model is described further with reference to the accompanying drawing:
As shown in Figure 1, the loop compensation circuit of the voltage control isolated form DC/DC converter of the present embodiment, including isolation
Compensating unit circuit 12 and loop compensation unit circuit 11；Loop compensation unit circuit 11 controls isolated form for offset voltage
The dual pole and high frequency zero that main power circuit link generates, and promote static gain；Compensating unit circuit 12 is isolated, is used for
Isolation primary and secondary circuit, while optical coupling isolator parasitic parameter bring pole is compensated, reduce it to power supply control loop
Adverse effect.
Loop compensation unit circuit 11 constitutes compensation net by operational amplifier N1, resistance R1, R2, R3 and capacitor C1, C2, C3
One end of network, resistance R1 is connect through capacitor C1 with the inverting input terminal of operational amplifier N1, and the other end and power supply of resistance R1 is defeated
Outlet connection, resistance R2 are connected in parallel on the both ends of resistance R1 Yu capacitor C1, and one end of resistance R3 and the reverse phase of operational amplifier N1 are defeated
Enter end connection, the other end ground connection of resistance R3, one end of resistance R4 is connect with the output end of operational amplifier N1, and resistance R4's is another
One end is connect through capacitor C3 with operational amplifier N1 inverting input terminal, and above-mentioned capacitor C2 is connected in parallel on the two of resistance R4 and capacitor C3
End.The compensation network generates a dominant pole, two common poles, two zero points and controls the main power of isolated form for offset voltage
The dual pole and high frequency zero that circuit link generates.Dominant pole can promote DC current gain, and two zero points are for offsetting main function
The dual pole that rate circuit generates, improves phase margin, and two common poles are used to offset the high frequency zero of main power circuit generation
Point improves gain margin, to improve the stability and accuracy of DC/DC changer system.
It includes photoelectrical coupler N2, resistance R5, current-limiting resistance R6, capacitor C4 and filter capacitor that compensating unit circuit 12, which is isolated,
One end of C5, resistance R5 are connect with the diode output of photoelectrical coupler N2, the output of the other end and loop compensation circuit
End connection, capacitor C4 are connected in parallel on the both ends of resistance R5, and one end of resistance R6 is connect with DC power supply VCC2, the other end and photoelectricity
The diode input terminal of coupler N2 connects, and the triode input terminal of photoelectrical coupler N2 and the end REF of pwm chip connect
It connects, the transistor output of photoelectrical coupler N2 and the end COMP of pwm chip connect, and the one end filter capacitor C5 and PWM are controlled
The end REF of coremaking piece connects, the other end ground connection of filter capacitor C5.The compensating unit circuit had both realized compensation circuit primary and secondary
Between isolation, and generate influence of the optocoupler own pole to compensation circuit of 1 zero compensation.The PWM of the present embodiment
Control chip model is LM5035, and the label 13 in the figure indicates pwm chip interior section circuit.
Working principle: pass through pressure sampling circuit R2, R3 bearing output voltage Vo feedback sample to operational amplifier N1
Phase input terminal is made comparisons with the reference voltage signal Vref for entering normal phase input end, and output error signal is to the end R5, C4.It mends
Repaying network R1, R4, C1, C2, C3 can produce 2 zero points and 2 common poles.Wherein R1, C1 determine a zero frequency, R4,
C2 determines another zero frequency, and R4, C3 determine that a pole frequency, R1, R2, C1 determine another pole frequency.By 2 zero
Point configuration, for offsetting the effect of dual pole, 2 common poles is matched at main power LC trap resonant frequency ω o
It sets at the equivalent series resistance Resr bring zero point of main power output capacitor C, inhibits the interference of high-frequency signal.Through overcompensation
Error signal afterwards is transmitted to the control chip LM5035 of primary circuit side by light-coupled isolation from circuit secondary side.Resistance R6,
The electric current for flowing into optocoupler diode side is limited in suitable working range by R5, and compensation network R5, C4 generates a zero point, is used
To compensate the pole of optocoupler parasitic capacitance generation.Error signal is in optocoupler triode side with current signal input control chip
The end COMP of LM5035, and be converted into voltage signal by the current mirroring circuit of chip interior 1:1 and be input to the negative of PWM comparator
End, the generation PWM drive signal compared with the oscillator signal RAMP of the anode of PWM comparator, to control main power circuit holding
Output voltage is constant.When output voltage Vo is greater than control target value, the voltage by R2, R3 partial pressure sampling is greater than reference voltage
Vref, operational amplifier export low level, and optical coupling isolator diode side conducting electric current becomes larger, and the survey of optocoupler triode senses
Electric current also becomes larger, so that the electric current for flowing into controller LM5035 becomes larger, the voltage signal that input PWM compares negative terminal reduces, PWM ratio
The control signal dutyfactor generated compared with device becomes smaller, and output voltage can be recalled to control target value, and vice versa.
DC/DC converter is often based on PWM modulation mode, keeps steady by carrying out negative feedback control to output voltage Vo
It is fixed.Isolated form DC/DC converter main power circuit is often used transformer isolation primary and secondary circuit, and feedback control circuit is often used
Light-coupled isolation primary and secondary circuit.
As shown in Fig. 2, Fig. 2 is the schematic diagram that the present embodiment is applied particularly to isolated form DC/DC converter, specifically include
PWM controller 3, the loop compensation circuit 1(partial pressure sampling network for exporting LC filter 2 and the present embodiment, is missed isolating transformer 4
Poor compensation network, isolator).
As shown in figure 3, by taking semibridge system isolated form DC/DC converter as an example, main power circuit by prime power switching tube Q1,
Q2, transformer T, secondary power switching tube Q3, Q4, output inductor L capacitor C composition.Based on small-signal analysis, transformer T
No-load voltage ratio N introduce a proportional component, output inductor L capacitor C constitutes bipolar spot net, and 180 ° are generated at resonance frequency
Phase delay.Since negative-feedback itself can bring 180 ° of phase delay again, open-loop gain may reach at resonance frequency
360 ° of phase delays generate self-oscillation, cause output voltage unstable.The equivalent series resistance ESR meeting of output filter capacitor C
Generate a high frequency zero.Therefore, it is necessary to be directed to semibridge system isolated form DC/DC converter main power circuit amplitude-frequency characteristic, design
Corresponding loop compensation circuit so that have preferable amplitude-frequency characteristic by compensated DC/DC converter, thus make semibridge system every
Release DC/DC converter output voltage stabilization.The utility model proposes annular compensating unit circuit and isolation compensating unit electricity
The two-stage compensation circuit on road can not only make control circuit realize primary and secondary electrical isolation, but also can compensate such as voltage-controlled type
The DC/DC converter main power circuit of PWM mode, can also compensate for by isolation optocoupler bring high frequency poles to loop gain
It influences.
When such as input voltage vin, load current Io, environment temperature Tc change and output voltage Vo are caused to change, point
Pressure sample circuit carries out partial pressure sampling to output voltage Vo and compared with reference voltage Vref, and then changes accounting for for PWM controller
Sky ratio D makes output voltage stabilization by controlling the switching tube of main power circuit.
Embodiment described above is only that preferred embodiments of the present invention are described, not practical to this
Novel range is defined, and under the premise of not departing from the spirit of the design of the utility model, those of ordinary skill in the art are to this
The various changes and improvements that the technical solution of utility model is made should all fall into the protection that the utility model claims book determines
In range.
Claims (3)
1. a kind of loop compensation circuit of voltage control isolated form DC/DC converter, it is characterised in that: including compensating unit is isolated
Circuit and loop compensation unit circuit；
The loop compensation unit circuit, for offset voltage control isolated form main power circuit link generate dual pole and
High frequency zero, and promote static gain；
The isolation compensating unit circuit for primary and secondary circuit to be isolated, while compensating optical coupling isolator parasitic parameter band
The pole come, reduces its adverse effect to power supply control loop.
2. the loop compensation circuit of voltage control isolated form DC/DC converter according to claim 1, it is characterised in that:
Including operational amplifier N1, resistance R1, R2, R3, R4 and capacitor C1, C2, C3, one end of the resistance R1 is through capacitor C1 and operation
The inverting input terminal of amplifier N1 connects, and the other end of resistance R1 is connect with power output end, and the resistance R2 is connected in parallel on resistance
The one end at the both ends of R1 and capacitor C1, resistance R3 is connect with the inverting input terminal of operational amplifier N1, another termination of resistance R3
The one end on ground, resistance R4 is connect with the output end of operational amplifier N1, and the other end of resistance R4 is through capacitor C3 and operational amplifier
The connection of N1 inverting input terminal, above-mentioned capacitor C2 are connected in parallel on the both ends of resistance R4 Yu capacitor C3.
3. the loop compensation circuit of voltage control isolated form DC/DC converter according to claim 1, it is characterised in that:
The isolation compensating unit circuit includes photoelectrical coupler N2, resistance R5, current-limiting resistance R6, capacitor C4 and filter capacitor C5, institute
The one end for stating resistance R5 is connect with the diode output of photoelectrical coupler N2, the output end of the other end and loop compensation circuit
Connection, the capacitor C4 are connected in parallel on the both ends of resistance R5, and one end of the resistance R6 is connect with DC power supply VCC2, the other end
It is connect with the diode input terminal of photoelectrical coupler N2, the triode input terminal and pwm chip of the photoelectrical coupler N2
The connection of the end REF, the end COMP of the transistor output of photoelectrical coupler N2 and pwm chip connects, the filter capacitor
The one end C5 and the end REF of pwm chip connect, the other end ground connection of filter capacitor C5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822053102.6U CN209046531U (en) | 2018-12-07 | 2018-12-07 | A kind of loop compensation circuit of voltage control isolated form DC/DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822053102.6U CN209046531U (en) | 2018-12-07 | 2018-12-07 | A kind of loop compensation circuit of voltage control isolated form DC/DC converter |
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| CN209046531U true CN209046531U (en) | 2019-06-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327146A (en) * | 2018-12-07 | 2019-02-12 | 中国电子科技集团公司第四十三研究所 | A kind of voltage controls loop compensation circuit and the compensation method of isolated form DC/DC converter |
| CN114828028A (en) * | 2022-03-10 | 2022-07-29 | 华南理工大学 | Energy recycling system for 5G indoor coverage |
-
2018
- 2018-12-07 CN CN201822053102.6U patent/CN209046531U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327146A (en) * | 2018-12-07 | 2019-02-12 | 中国电子科技集团公司第四十三研究所 | A kind of voltage controls loop compensation circuit and the compensation method of isolated form DC/DC converter |
| CN109327146B (en) * | 2018-12-07 | 2024-03-22 | 中国电子科技集团公司第四十三研究所 | Loop compensation circuit and compensation method of voltage control isolation type DC/DC converter |
| CN114828028A (en) * | 2022-03-10 | 2022-07-29 | 华南理工大学 | Energy recycling system for 5G indoor coverage |
| CN114828028B (en) * | 2022-03-10 | 2023-06-20 | 华南理工大学 | Energy recycling system for 5G indoor coverage |
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