CN207283384U - A kind of feedback regulation control circuit and Switching Power Supply - Google Patents
A kind of feedback regulation control circuit and Switching Power Supply Download PDFInfo
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- CN207283384U CN207283384U CN201721157478.0U CN201721157478U CN207283384U CN 207283384 U CN207283384 U CN 207283384U CN 201721157478 U CN201721157478 U CN 201721157478U CN 207283384 U CN207283384 U CN 207283384U
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- 230000009123 feedback regulation Effects 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 claims description 104
- 239000003990 capacitor Substances 0.000 claims description 21
- 239000004020 conductor Substances 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 16
- 230000003321 amplification Effects 0.000 claims description 10
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 10
- 230000003750 conditioning effect Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 230000000717 retained effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
A kind of feedback regulation control circuit and Switching Power Supply are the utility model is related to, including：It is connected with electricity consumption end, gathers electricity consumption terminal voltage and produce the electricity consumption end sample circuit of electricity consumption end sampled voltage；It is connected with electricity consumption end sample circuit, the calculus of differences amplifying circuit of calculus of differences processing and output difference voltage is carried out based on sampled voltage；It is connected respectively with calculus of differences amplifying circuit, power output end, the one-way conduction device turned on when differential voltage is less than supply voltage；It is connected with power output end, feedback signal is produced when one-way conduction device turns on and is transmitted to the regulator circuit of governor circuit；Governor circuit exports corresponding pwm signal regulating power source voltage according to feedback signal.This programme can under conditions of loop stability is not influenced, simple compensation output voltage on line caused by pressure drop, be positively retained at using electric end in the voltage of voltage stabilized range, guarantee system can work normally, effectively lifted client electricity system stabilization.
Description
Technical Field
The utility model relates to a switching power supply's technical field, more specifically say, relate to a feedback regulation control circuit and switching power supply.
Background
With the increasing storage capacity, calculation speed, accessories and the like of computer equipment, the power of a switching power supply for power distribution is increased continuously, the output voltage of the power supply is fixed and is 12V, 5V, 3.3V, 5Vsb, 12V and the like, the power is low-voltage output, and the output current is increased continuously when the output power is increased.
The feedback sampling of the voltage-stabilizing power supply is generally only carried out on a PCB (printed circuit board) in the power supply, when the butt joint of the power supply and a power utilization system is too long in wiring and the current is too large, the voltage difference generated on the wire is not ignored, even the power utilization tail end drops out the voltage in a voltage-stabilizing range, and finally the system is caused to work abnormally or shut down.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a feedback regulation control circuit and switching power supply are provided.
The utility model provides a technical scheme that its technical problem adopted is: constructing a feedback regulation control circuit comprising:
the power consumption end sampling circuit is connected with the power consumption end, acquires the voltage of the power consumption end and generates a power consumption end sampling voltage;
the differential operational amplifier circuit is connected with the power consumption tail end sampling circuit, performs differential operational processing based on the power consumption tail end sampling voltage and outputs differential voltage;
the unidirectional breakover device is respectively connected with the differential operational amplification circuit and the power supply output end and is conducted when the differential voltage is smaller than the power supply voltage;
the voltage stabilizing circuit is connected with the output end of the power supply, generates a feedback signal when the one-way conductor is conducted and transmits the feedback signal to the main control circuit; and the main control circuit outputs a corresponding PWM signal according to the feedback signal to regulate the power supply voltage.
Preferably, the power consumption end sampling circuit comprises a first sampling circuit and a second sampling circuit; the power consumption end sampling voltage comprises a first sampling voltage and a second sampling voltage;
the first sampling circuit is connected with the power consumption tail end, collects the voltage of the power consumption tail end and outputs a first sampling voltage to the positive input end of the differential operational amplification circuit;
the second sampling circuit is connected with the power consumption tail end, collects the voltage of the power consumption tail end and outputs a second sampling voltage to the negative input end of the differential operational amplification circuit.
Preferably, a third sampling circuit and a fourth sampling circuit are further included;
the third sampling circuit is respectively connected with the positive input end of the differential operational amplifier circuit and the power output end, collects the power voltage and outputs a third sampling voltage to the positive input end of the differential operational amplifier circuit;
the fourth sampling circuit is respectively connected with the negative input end of the differential operational amplification circuit and the negative end of the power supply, collects the voltage output by the negative end of the power supply and outputs a fourth sampling voltage to the negative input end of the differential operational amplification circuit.
Preferably, the sampling circuit further comprises a clamping circuit, wherein the clamping circuit is connected between the second sampling circuit and the negative end of the power supply and is used for controlling the second sampling voltage output by the second sampling circuit within a set value.
Preferably, the clamping circuit comprises a clamping diode, a cathode of the clamping diode is connected with the output end of the second sampling circuit, and an anode of the clamping diode is connected with the negative end of the power supply.
Preferably, the unidirectional conductor is a diode, a cathode of the diode is connected with an output end of the differential operational amplifier circuit, and an anode of the diode is connected with the power output end.
Preferably, the differential operational amplifier circuit includes a differential operational amplifier, a second resistor, a fourth resistor, a fifth resistor, and a seventh resistor;
the first end of the second resistor is a positive input end of the differential operational amplifier circuit, the first end of the fourth resistor is a negative input end of the differential operational amplifier circuit, and the output end of the differential operational amplifier is the output end of the differential operational amplifier circuit;
the first end of the second resistor is connected with the first sampling circuit, the second end of the second resistor is connected with the non-inverting input end of the differential operational amplifier, and the non-inverting input end of the differential operational amplifier is connected with the negative end of a power supply through the seventh resistor; the first end of the fourth resistor is connected with the second sampling circuit, the second end of the fourth resistor is connected with the inverting input end of the differential operational amplifier, and the fifth resistor is connected between the inverting input end and the output end of the differential operational amplifier in parallel.
Preferably, the differential operational amplifier circuit further includes a first filter capacitor and a second filter capacitor;
a first end of the first filter capacitor is connected with a second end of the second resistor, and a second end of the first filter capacitor is connected with a second end of the fourth resistor;
the second filter capacitor is connected with the fifth resistor in parallel.
Preferably, the power supply further comprises a voltage dividing resistor, a first end of the voltage dividing resistor is connected with the power supply output end, and a second end of the voltage dividing resistor is connected with the voltage stabilizing circuit.
The utility model also provides a switching power supply, as above feedback regulation control circuit.
Implement the utility model discloses a feedback control circuit has following beneficial effect: the utility model discloses a feedback control circuit can be under the condition that does not influence loop stability, and the voltage that simple compensation output voltage caused on line is separated, uses the electricity end can keep in the voltage of steady voltage scope, and the assurance system can normally work, effectively promotes the stability of customer end power consumption system.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a block diagram of a first embodiment of a feedback regulation control circuit of the present invention;
fig. 2 is a block diagram of a second embodiment of a feedback regulation control circuit of the present invention;
fig. 3 is a schematic circuit diagram of a second embodiment of the feedback regulation control circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1, the feedback regulation control circuit of the present embodiment includes an electric end sampling circuit 10, a differential operational amplifier circuit 20, a one-way conductor 30, and a voltage regulator circuit 40.
In particular, the amount of the solvent to be used,
the power consumption end sampling circuit 10 is connected with the power consumption end, collects the voltage of the power consumption end and generates power consumption end sampling voltage.
And a differential operational amplifier circuit 20 connected to the electricity consumption end sampling circuit 10, receiving the electricity consumption end sampling voltage output by the electricity consumption end sampling circuit 10, and performing differential operational processing on the electricity consumption end sampling voltage to output a differential voltage.
The unidirectional conductor 30 is connected to the differential operational amplifier circuit 20 and the power supply output terminal (i.e., the positive power supply terminal), and is turned on when the differential voltage output by the differential operational amplifier circuit 20 is smaller than the power supply voltage output by the power supply output terminal. It will be appreciated that when the one-way conductor 30 is conducting, the regulation of the regulated voltage within the power supply is primarily affected by the difference between the differential voltage and the power supply voltage at that time.
Preferably, in the present embodiment, the one-way conductor 30 may adopt a diode, a cathode of the diode is connected to the output terminal of the differential operational amplifier circuit 20, and an anode of the diode is connected to the power supply output terminal. Therefore, based on this connection structure, when the differential voltage output by the differential operational amplifier circuit 20 is smaller than the power voltage output by the power output terminal, the diode is turned off at this time because the forward voltage drop of the diode is not reached, and the output stable voltage is determined only by the sampling voltage on the power PCB board.
And the voltage stabilizing circuit 40 is connected with the power supply output end, generates a feedback signal when the one-way conductor 30 is conducted, and transmits the feedback signal to the main control circuit. It should be noted that the final stabilized voltage fed back by the power supply is the voltage output by the voltage stabilizing circuit 40.
It can be understood that, when the one-way conductor 30 is turned on, it indicates that the differential voltage is smaller than the power voltage, that is, the voltage difference generated on the trace where the power source is connected to the power system is not negligible, and the voltage output by the power output end needs to be adjusted according to the voltage difference generated on the trace. And the main control circuit in the power can gather the voltage on the voltage stabilizing circuit 40, when the one-way conductor 30 is conducted, because the voltage drop of the connected voltage stabilizing circuit 40 is reduced, at this moment, the voltage stabilizing circuit 40 generates a feedback signal to the main control circuit, the main control circuit outputs a corresponding PWM signal according to the feedback signal, the power voltage is adjusted through the PWM signal to promote the voltage drop on the compensation wiring, and finally the voltage stabilization of the power utilization terminal is realized.
As shown in fig. 2, it is a block diagram of a second embodiment of the feedback regulation control circuit of the present invention. In this embodiment, the feedback regulation control circuit includes an electric end sampling circuit 10, a differential operational amplifier circuit 20, a one-way conductor 30, and a voltage stabilizing circuit 40.
Wherein,
the electric end sampling circuit 10 includes a first sampling circuit 101 and a second sampling circuit 102, and the electric end sampling voltage includes a first sampling voltage and a second sampling voltage.
The first sampling circuit 101 is connected to the power consumption end, and collects the voltage at the power consumption end and outputs a first sampling voltage to the positive input terminal of the differential operational amplifier circuit 20.
The second sampling circuit 102 is connected to the power consumption terminal, and collects the voltage of the power consumption terminal and outputs a second sampling voltage to the negative input terminal of the differential operational amplifier circuit 20.
It can be understood that the first sampling circuit 101 collects the voltage on the trace where the positive output end of the power supply terminal is butted with the power consumption terminal; the second sampling circuit 102 collects the voltage on the trace that returns to the power supply terminal with the power terminal. By collecting the voltages of the two points at the end of the power utilization and transmitting the voltages to the differential operational amplifier circuit 20 for differential operational processing, the voltage difference between the two points can be simply, effectively and quickly calculated, and the magnitude relation between the voltage difference and the power voltage can be judged through the one-way conductor 30 based on the voltage difference (i.e., the differential voltage).
The unidirectional conductor 30 is preferably a diode, and since the conduction voltage of the diode is about 0.1V, when the difference between the differential voltage and the power voltage is greater than 0.1V, the diode can be quickly conducted, and it can be quickly determined that the voltage drop on the wiring at this time has an influence on the system. The scheme can quickly and effectively judge whether the pressure drop on the wiring affects the system, and has high judgment precision, low cost and simple and easy realization.
Alternatively, the feedback regulation control circuit of the present embodiment may further include a third sampling circuit 50 and a fourth sampling circuit 60.
The third sampling circuit 50 is connected to the positive input end and the power output end of the differential operational amplifier circuit 20, respectively, and is configured to collect the power voltage output by the power output end in real time and output a third sampling voltage to the positive input end of the differential operational amplifier circuit 20. It can be understood that when the first sampling circuit 101 fails, the power voltage can be regulated by collecting the power voltage in real time through the third sampling circuit 50, so as to ensure the stability of the output voltage of the voltage regulating circuit 40.
The fourth sampling circuit 60 is connected to the negative input terminal of the differential operational amplifier circuit 20 and the negative terminal of the power supply, and is configured to collect the voltage output by the negative terminal of the power supply and output a fourth sampling voltage to the negative input terminal of the differential operational amplifier circuit 20. It can be understood that when the second sampling circuit 102 fails, the voltage at the negative terminal of the power supply can be sampled and fed back by the fourth sampling circuit 60 to achieve the regulation of the power supply voltage, so as to further ensure the stability of the output voltage of the voltage stabilizing circuit 40.
Preferably, the feedback regulation control circuit of the present embodiment further comprises a clamping circuit 70, wherein the clamping circuit 70 is connected between the second sampling circuit 102 and the negative terminal of the power supply, and is used for controlling the second sampling voltage output by the second sampling circuit 102 within the set value. It is understood that the setting value can be determined according to the output voltage of the power consumption end feedback line, that is, the clamping circuit 70 is arranged to prevent the second sampling voltage from generating a backflow phenomenon higher than the output voltage of the power consumption end feedback line.
Alternatively, the clamping circuit 70 of the present embodiment includes a clamping diode, and the cathode of the clamping diode is connected to the output terminal of the second sampling circuit 102, and the anode of the clamping diode is connected to the negative terminal of the power supply.
The differential operational amplifier circuit 20 includes a differential operational amplifier, a second resistor, a fourth resistor, a fifth resistor, and a seventh resistor, wherein a first end of the second resistor is a positive input end of the differential operational amplifier circuit 20, a first end of the fourth resistor is a negative input end of the differential operational amplifier circuit 20, and an output end of the differential operational amplifier circuit is an output end of the differential operational amplifier circuit 20.
The first end of the second resistor is connected with the first sampling circuit 101, the second end of the second resistor is connected with the non-inverting input end of the differential operational amplifier, and the non-inverting input end of the differential operational amplifier is connected with the negative end of the power supply through a seventh resistor; a first end of the fourth resistor is connected to the second sampling circuit 102, a second end of the fourth resistor is connected to the inverting input terminal of the differential operational amplifier, and the fifth resistor is connected in parallel between the inverting input terminal and the output terminal of the differential operational amplifier.
Alternatively, in the present embodiment, the differential operational amplifier circuit 20 further includes a first filter capacitor and a second filter capacitor. The first end of the first filter capacitor is connected with the second end of the second resistor, the second end of the first filter capacitor is connected with the second end of the fourth resistor, and the second filter capacitor is connected with the fifth resistor in parallel. By providing the filter capacitor in the differential operational amplifier circuit 20, the interference signal in the circuit can be filtered out, and the signal transmitted on the circuit is more stable.
Further, the feedback regulation control circuit of this embodiment further includes a voltage dividing resistor, wherein a first end of the voltage dividing resistor is connected to the power output terminal, a second end of the voltage dividing resistor is connected to the voltage stabilizing circuit 40, and a node at which the second end of the voltage dividing resistor is connected to the voltage stabilizing circuit 40 is further connected to the one-way conductor 30.
To sum up, the utility model discloses a feedback control circuit can simply compensate the voltage drop that power output voltage caused on line effectively under the condition that does not influence loop stability, promotes the stability of customer end power consumption system.
The utility model also provides a switching power supply, this switching power supply includes above-mentioned feedback control circuit. Through setting up this feedback regulation control circuit, can judge whether the pressure differential that produces can exert an influence to the system on the line is walked to the power output end and the butt joint of power consumption system fast, perhaps whether can lead to the voltage that the power consumption end fell the steady voltage scope to output a feedback signal to the inside master control circuit of power when pressure differential exerts an influence to the system, export corresponding PWM signal and then adjust power output voltage through master control circuit, finally realize the voltage stability of power consumption end.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a second embodiment of the feedback regulation control circuit according to the present invention.
As shown in fig. 3, the first sampling voltage generated by the first sampling circuit 101 is 12V _ Sense, the second sampling voltage generated by the second sampling circuit 102 is R _ Sense, the power supply voltage output by the power supply output terminal is +12V, and the final output stable voltage of the power supply is 12V _ FB.
The first sampling circuit 101 can acquire the voltage of the power consumption end by connecting a line to the power consumption end, and the second sampling circuit 102 can acquire the voltage of the power consumption end return line by connecting a line to the power consumption end return line.
The third sampling circuit 50 includes a resistor R1, and the fourth sampling circuit 60 includes a resistor R6.
The differential operational amplifier circuit 20 includes a differential operational amplifier U1, a second resistor R2, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, a first filter capacitor C1, and a second filter capacitor C2.
The unidirectional conductor 30 includes a diode D1, the voltage dividing resistor is a voltage dividing resistor R3, and the clamping circuit 70 includes a clamping diode D2.
The specific connection relationship of the components is as follows:
the first end of the second resistor R2 is connected with the first sampling circuit 101, the second end of the second resistor R2 is connected with the non-inverting input end of the differential operational amplifier U1, the non-inverting input end of the differential operational amplifier U1 is also connected with the negative end of the power supply through the seventh resistor R7, the first end of the second resistor R2 is connected with the connecting node of the first sampling circuit 101 and the second end of the first resistor R1, and the first end of the first resistor R1 is connected with the output end of the power supply.
The second sampling circuit 102 is connected with a first end of a fourth resistor R4, a second end of the fourth resistor R4 is connected with an inverting input end of a differential operational amplifier U1, an output end of the differential operational amplifier U1 is connected with a cathode of a diode D1, and an anode of a diode D1 is connected with a node where a voltage dividing resistor R3 is connected with a voltage stabilizing circuit 40; the fifth resistor R5 is connected in parallel between the inverting input end and the output end of the differential operational amplifier; the second filter capacitor C2 is connected in parallel with the fifth resistor R5. A first terminal of the first filter capacitor C1 is connected to a second terminal of the second resistor R2, and a second terminal of the first filter capacitor C1 is connected to a second terminal of the fourth resistor R4.
The cathode of the clamping diode D2 is connected with the second sampling circuit 102, and the anode of the clamping diode D2 is connected with the negative end of the power supply; the first end of the voltage-dividing resistor R3 is connected with the power output end, and the second end of the voltage-dividing resistor R3 is connected with the voltage stabilizing circuit 40.
The operation principle of the feedback regulation control circuit of the present embodiment will be described by taking the above-described schematic circuit diagram as an example.
As shown in fig. 3, 12V _ Sense and R _ Sense are respectively the sampled voltages sampled at the end of power utilization, and +12V is the sampled voltage at the power output terminal (typically, the end of the power internal PCB motherboard).
When the differential voltage (12V _ Sense-R _ Sense) at the end is close to +12V (i.e. under no load or small load condition), the voltage output from the output terminal (PIN _1 PIN in the figure) of the differential operational amplifier U1 is the sampled differential voltage, which is consistent with +12V, at this time, since the forward voltage drop of the diode D1 does not reach, the diode D1 at this time is turned off, and the output stable voltage is determined only by the sampled voltage on the power PCB board.
When the differential voltage (12V _ Sense-R _ Sense) at the end is lower than +12V (assumed to be 11.8V), the voltage at the output end of the differential operational amplifier U1 is 11.8V, which has a voltage difference with +12V, the forward voltage drop of the diode D1 is about 0.1V, the voltage difference between the voltage output by the differential operational amplifier U1 and the power voltage (+12V) is 0.2V, the conduction voltage drop of the diode D1 is reached, so that the diode D1 is turned on at this time to realize a pull-up current, the current pulled by the diode D1 causes a voltage difference on the voltage dividing resistor R3, the pull-up current is 5mA, the voltage dividing resistor R3 is increased to be more than the voltage difference of 0.15V, and the voltage stabilizing circuit for the final stabilization of the power feedback is the voltage stabilizing circuit 40, i.e. (12V _ FB), therefore, a feedback signal is generated at the main control circuit 40 to adjust the PWM voltage output by the power supply from +12V to about 12V 15V, the voltage drop of the wiring or the PCB section can be compensated by adjusting the power supply voltage, and finally, the voltage stability of the power consumption tail end is realized.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A feedback regulation control circuit, comprising:
the power consumption end sampling circuit is connected with the power consumption end, acquires the voltage of the power consumption end and generates a power consumption end sampling voltage;
the differential operational amplifier circuit is connected with the power consumption tail end sampling circuit, performs differential operational processing based on the power consumption tail end sampling voltage and outputs differential voltage;
the unidirectional breakover device is respectively connected with the differential operational amplification circuit and the power supply output end and is conducted when the differential voltage is smaller than the power supply voltage;
the voltage stabilizing circuit is connected with the output end of the power supply, generates a feedback signal when the one-way conductor is conducted and transmits the feedback signal to the main control circuit; and the main control circuit outputs a corresponding PWM signal according to the feedback signal to regulate the power supply voltage.
2. The feedback regulation control circuit of claim 1 wherein the power end sampling circuit comprises a first sampling circuit and a second sampling circuit; the power consumption end sampling voltage comprises a first sampling voltage and a second sampling voltage;
the first sampling circuit is connected with the power consumption tail end, collects the voltage of the power consumption tail end and outputs a first sampling voltage to the positive input end of the differential operational amplification circuit;
the second sampling circuit is connected with the power consumption tail end, collects the voltage of the power consumption tail end and outputs a second sampling voltage to the negative input end of the differential operational amplification circuit.
3. The feedback regulation control circuit of claim 1 further comprising a third sampling circuit and a fourth sampling circuit;
the third sampling circuit is respectively connected with the positive input end of the differential operational amplifier circuit and the power output end, collects the power voltage and outputs a third sampling voltage to the positive input end of the differential operational amplifier circuit;
the fourth sampling circuit is respectively connected with the negative input end of the differential operational amplification circuit and the negative end of the power supply, collects the voltage output by the negative end of the power supply and outputs a fourth sampling voltage to the negative input end of the differential operational amplification circuit.
4. The feedback regulation control circuit of claim 2 further comprising a clamp circuit connected between the second sampling circuit and a negative supply terminal for controlling a second sampling voltage output by the second sampling circuit within a set value.
5. The feedback regulation control circuit of claim 4 wherein the clamping circuit comprises a clamping diode having a cathode connected to the output of the second sampling circuit and an anode connected to the negative power supply terminal.
6. The feedback regulation control circuit of claim 1 wherein the one-way conductor is a diode, a cathode of the diode is connected to the output of the differential operational amplifier circuit, and an anode of the diode is connected to the power supply output.
7. The feedback regulation control circuit of claim 2 wherein the differential operational amplifier circuit comprises a differential operational amplifier, a second resistor, a fourth resistor, a fifth resistor, and a seventh resistor;
the first end of the second resistor is a positive input end of the differential operational amplifier circuit, the first end of the fourth resistor is a negative input end of the differential operational amplifier circuit, and the output end of the differential operational amplifier is the output end of the differential operational amplifier circuit;
the first end of the second resistor is connected with the first sampling circuit, the second end of the second resistor is connected with the non-inverting input end of the differential operational amplifier, and the non-inverting input end of the differential operational amplifier is connected with the negative end of a power supply through the seventh resistor; the first end of the fourth resistor is connected with the second sampling circuit, the second end of the fourth resistor is connected with the inverting input end of the differential operational amplifier, and the fifth resistor is connected between the inverting input end and the output end of the differential operational amplifier in parallel.
8. The feedback regulation control circuit of claim 7 wherein the differential operational amplifier circuit further comprises a first filter capacitor and a second filter capacitor;
a first end of the first filter capacitor is connected with a second end of the second resistor, and a second end of the first filter capacitor is connected with a second end of the fourth resistor;
the second filter capacitor is connected with the fifth resistor in parallel.
9. The feedback conditioning control circuit of claim 1, further comprising a voltage divider resistor, a first terminal of the voltage divider resistor being connected to the power output terminal, and a second terminal of the voltage divider resistor being connected to the voltage regulator circuit.
10. A switching power supply comprising a feedback regulation control circuit as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721157478.0U CN207283384U (en) | 2017-09-11 | 2017-09-11 | A kind of feedback regulation control circuit and Switching Power Supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721157478.0U CN207283384U (en) | 2017-09-11 | 2017-09-11 | A kind of feedback regulation control circuit and Switching Power Supply |
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| CN207283384U true CN207283384U (en) | 2018-04-27 |
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| CN201721157478.0U Active CN207283384U (en) | 2017-09-11 | 2017-09-11 | A kind of feedback regulation control circuit and Switching Power Supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113852274A (en) * | 2021-09-26 | 2021-12-28 | 石家庄通合电子科技股份有限公司 | Switching power supply far-end compensation circuit and switching power supply |
| CN114374308A (en) * | 2021-12-15 | 2022-04-19 | 北京电子工程总体研究所 | Switch power supply isolation remote acquisition circuit and design method thereof |
| CN114614456A (en) * | 2020-12-04 | 2022-06-10 | 南京宏泰半导体科技有限公司 | Clamping system and method |
| CN116505645A (en) * | 2023-06-21 | 2023-07-28 | 灿芯半导体(成都)有限公司 | Escape circuit for coping with built-in power failure |
-
2017
- 2017-09-11 CN CN201721157478.0U patent/CN207283384U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614456A (en) * | 2020-12-04 | 2022-06-10 | 南京宏泰半导体科技有限公司 | Clamping system and method |
| CN113852274A (en) * | 2021-09-26 | 2021-12-28 | 石家庄通合电子科技股份有限公司 | Switching power supply far-end compensation circuit and switching power supply |
| CN114374308A (en) * | 2021-12-15 | 2022-04-19 | 北京电子工程总体研究所 | Switch power supply isolation remote acquisition circuit and design method thereof |
| CN114374308B (en) * | 2021-12-15 | 2024-06-04 | 北京电子工程总体研究所 | Switch power supply isolation remote sampling circuit and design method thereof |
| CN116505645A (en) * | 2023-06-21 | 2023-07-28 | 灿芯半导体(成都)有限公司 | Escape circuit for coping with built-in power failure |
| CN116505645B (en) * | 2023-06-21 | 2023-09-12 | 灿芯半导体(成都)有限公司 | Escape circuit for coping with built-in power failure |
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