CN113809914A - Constant voltage control circuit - Google Patents
Constant voltage control circuit Download PDFInfo
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- CN113809914A CN113809914A CN202110934117.7A CN202110934117A CN113809914A CN 113809914 A CN113809914 A CN 113809914A CN 202110934117 A CN202110934117 A CN 202110934117A CN 113809914 A CN113809914 A CN 113809914A
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- 238000005070 sampling Methods 0.000 claims abstract description 52
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000007423 decrease Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
The invention discloses a constant voltage control circuit which is applied to a switch power supply with switchable output voltage polarity. When the polarity of the output voltage of the switching power supply is changed from positive polarity to negative polarity, or from negative polarity to positive polarity, the output constant voltage control circuit can meet the logic operation required by the output signals with two different polarities by only one error comparator by adjusting the wiring mode of the sampling circuit, so that the feedback voltage of the output voltage can be adjusted and controlled in time, and the switching power supply still works normally after the polarity of the output voltage is changed. The circuit is simple, the positive and negative polarity switching response is quick, and compared with the prior art, the number of components is greatly reduced, so that the cost is reduced, and the size of the switching power supply is reduced.
Description
Technical Field
The present invention relates to switching power supplies, and more particularly to constant voltage control of power supplies with switchable output voltage polarities.
Background
In the case of the switching power supply used in some special applications, the polarity of the output voltage of the switching power supply needs to be different due to different use conditions, the switching power supply needs to output a positive polarity voltage at some times, and the switching power supply needs to output a negative polarity voltage at other times, so that the polarity of the output voltage of the switching power supply needs to be controlled, and according to the difference of the control signals, the polarity of the output voltage can be switched from a positive polarity to a negative polarity or from a negative polarity to a positive polarity, for the output constant voltage control circuit of the switching power supply, the sampling mode of the output constant voltage control circuit of the module also needs to be changed synchronously to maintain the stability of the output voltage when the polarity of the output voltage of the switching power supply is switched, the module is ensured to still work normally after the polarity of the output voltage is changed. How to realize the output constant voltage control circuit becomes a key problem.
Fig. 1 is a schematic block diagram of an output constant voltage control circuit of a switching power supply with switchable output voltage polarity in the prior art, which includes a sampling circuit a1, a sampling circuit B1, a reference circuit a2, a reference circuit B2, a compensation circuit A3, a compensation circuit B3, an error comparator a4, an error comparator B4, a gating circuit C1, a positive voltage sampling port + Vout, a negative voltage sampling port-Vout, and a feedback port Vfb.
The positive voltage sampling port + Vout is connected with one end of a sampling circuit A1, the other end of the sampling circuit A1 is connected with one input end of an error comparator A4 and one end of a compensation circuit A3, the other end of the compensation circuit A3 is connected with the output end of an error comparator A4 and one input end of a gating circuit C1, and a reference circuit A2 is connected with the other input end of the error comparator A4; the negative voltage sampling port-Vout is connected with one end of a sampling circuit B1, the other end of the sampling circuit B1 is connected with one input end of an error comparator B4 and one end of a compensation circuit B3, the other end of the compensation circuit B3 is connected with the output end of an error comparator B4 and the other input end of a gating circuit C1, and a reference circuit B2 is connected with the other input end of the error comparator B4; the output of the gating circuit C1 is connected to the feedback port Vfb.
The working principle of the prior art shown in fig. 1 is as follows:
the output constant voltage control circuit required for the output voltage with positive polarity and the output constant voltage control circuit required for the output voltage with negative polarity are combined together, and the gating circuit selects the corresponding constant voltage control circuit to control the magnitude of the output voltage according to the polarity of the output voltage. The sampling circuits A1 and B1 respectively correspond to sampling circuits with positive output voltage polarity and negative output voltage polarity, signals of the two sampling circuits pass through respective error comparators simultaneously, after the signals are compared with signals of a reference circuit, the signals are output to a compensation circuit and a gating circuit by the error comparators, finally the gating circuit C1 judges and selects corresponding feedback signals to be output to a feedback port Vfb according to the polarity of the output voltage at that time, when the polarity of the output voltage is switched, the gating circuit C1 is rapidly switched to output the corresponding feedback signals of an output constant voltage control circuit, and the stability of the output voltage of the switching power supply can be maintained after the polarity of the output voltage is switched.
The circuit has the defects that components are nearly doubled compared with an output constant voltage control circuit of a single-polarity switching power supply, the cost is increased, particularly for a high-voltage power supply, the output voltage of the high-voltage power supply is high, the high potential area of a sampling circuit is large, if the high potential area of a PCB is large due to the fact that the high-voltage power supply is provided with a plurality of sampling circuits, the requirement for the safety distance of the components is large during the distribution of the components, the area of the PCB is increased rapidly, and the miniaturization of a product is hindered.
Disclosure of Invention
In view of this, the present invention provides a constant voltage control circuit, which is applied to a switching power supply with switchable output voltage polarities, and which can reduce a part of devices and reduce product cost.
The invention is realized by the following technical scheme:
a constant voltage control circuit, comprising: the circuit comprises a first resistor R1, a second resistor R2, a fourth resistor R4, a fifth resistor R5, an operational amplifier IC1, a positive voltage sampling port + Voc, a negative voltage sampling port-Voc, a ground electrode port GND, a reference voltage port Vref and an output feedback voltage port Vfb;
the positive voltage sampling port + Voc is connected with one end of a first resistor R1, the other end of the first resistor R1 is simultaneously connected with one end of a second resistor R2 and a first input end of an operational amplifier IC1, the other end of the second resistor R2 is connected with a ground terminal GND, the negative voltage sampling port-Voc is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is simultaneously connected with one end of a fourth resistor R4 and a second input end of the operational amplifier IC1, and the other end of the fourth resistor R4 is connected with a reference voltage port Vref; the output of the operational amplifier IC1 is connected to the output feedback voltage port Vfb.
Further, the first input terminal of the operational amplifier IC1 is the inverting terminal thereof, the second input terminal of the operational amplifier IC1 is the inverting terminal thereof, and when the polarity of the output voltage of the applied switching power supply is positive, the positive voltage sampling port + Voc is used for collecting a signal of the output voltage Vout of the switching power supply, and the negative voltage sampling port-Voc is used for connecting to the ground potential.
Further, the first input terminal of the operational amplifier IC1 is the inverting terminal thereof, the second input terminal of the operational amplifier IC1 is the inverting terminal thereof, and when the polarity of the output voltage of the applied switching power supply is negative, the positive voltage sampling port + Voc is used for connecting to the ground potential, and the negative voltage sampling port-Voc is used for collecting the signal of the output voltage Vout of the switching power supply.
Further, the constant voltage control circuit further includes: the connection relationship between the first capacitor C1 and the third resistor R3 is as follows: one end of the third resistor R3 is connected to the output end of the operational amplifier IC1, the other end of the third resistor R3 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the first input end of the operational amplifier IC 1; or one end of the first capacitor C1 is connected to the output end of the operational amplifier IC1, the other end of the first capacitor C1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the first input end of the operational amplifier IC 1.
The working principle of the present invention will be elaborated in detail by combining with specific embodiments, which are not described herein, and compared with the prior art, the present invention has the following beneficial effects:
1. the circuit is simple to realize, and the output constant voltage control circuit can meet the logic operation required by two output signals with different polarities only by one error comparator by adjusting the wiring mode of the sampling circuit.
2. The device quantity is few, and is with low costs, and the device overall arrangement can be compacter, reduces PCB board area, does benefit to and reduces the module volume.
Drawings
Fig. 1 is a schematic block diagram of an output constant voltage control circuit of a switching power supply with switchable output voltage polarities in the prior art;
FIG. 2 is a functional block diagram of the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention;
FIG. 4 is a schematic diagram of voltage values of the positive voltage sampling port + Voc and the negative voltage sampling port-Voc under different polarity output voltages.
Detailed Description
As shown in fig. 2, which is a schematic block diagram of the present invention, when the output voltage polarity of the switching power supply is changed from positive polarity to negative polarity, or from negative polarity to positive polarity, the constant voltage control circuit of the present invention is applied to the switching power supply with switchable output voltage polarity, and by adjusting the connection manner of the sampling circuit, the output constant voltage control circuit can satisfy the logic operations required by the two output signals with different polarities only by using one error comparator, so as to adjust and control the feedback voltage of the output voltage in time, and make the switching power supply still work normally after changing the output voltage polarity. The circuit is simple, the positive and negative polarity switching response is quick, and compared with the prior art, the number of components is greatly reduced, so that the cost is reduced, and the size of the switching power supply is reduced.
In order that those skilled in the art will better understand the present invention, the present invention will be further described below in conjunction with specific implementation circuits.
Fig. 3 is a schematic diagram of an embodiment of the present invention, which includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, an operational amplifier IC1, a positive voltage sampling port + Voc, a negative voltage sampling port-Voc, a ground port GND, a reference voltage port Vref, and an output feedback voltage port Vfb.
The positive voltage sampling port + Voc is connected with one end of a first resistor R1, the other end of the first resistor R1 is simultaneously connected with one end of a second resistor R2, the inverting input end of an operational amplifier IC1 and one end of a first capacitor C1, the other end of a second resistor R2 is connected with a ground terminal GND, the other end of a first capacitor C1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is simultaneously connected with the output end of an operational amplifier IC1 and an output feedback voltage port Vfb, the negative voltage sampling port-Voc is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is simultaneously connected with the non-inverting input end of the operational amplifier IC1 and one end of a fourth resistor R4, and the other end of the fourth resistor R4 is connected with a reference voltage port Vref.
In the embodiment, the voltage of the reference voltage port Vref and the voltage of the output feedback voltage port Vfb are default to positive polarity, and the logical relationship with the voltage of the module output voltage Vout is that when the voltage of Vfb increases, the absolute value of the voltage of the module output voltage Vout increases; when the Vfb voltage decreases, the absolute value of the module output voltage Vout voltage decreases.
In this embodiment, when the polarity of the output voltage of the module is positive, the positive voltage sampling port + Voc is connected to the output voltage port Vout for collecting signals, and the negative voltage sampling port-Voc is connected to the ground potential; when the polarity of the output voltage of the module is negative, the negative voltage sampling port-Voc is connected with the output voltage port Vout to collect signals, and the positive voltage sampling port + Voc is connected to the ground potential; FIG. 4 is a schematic diagram showing voltage values of the positive voltage sampling port + Voc and the negative voltage sampling port-Voc under different polarity output voltages.
A non-inverting input terminal: the operational amplifier is shown with the + end.
An inverting input terminal: the operational amplifier is shown with one end labeled.
The dummy break and dummy short characteristics of the operational amplifier are well known to those skilled in the art and will not be described herein.
The working principle of the embodiment is as follows:
the output voltage polarity has two states, one is that the output voltage is positive polarity, another is that the output voltage is negative polarity, specifically as follows:
when the output voltage polarity of the applied switching power supply is positive, the positive voltage sampling port + Voc collects a signal of the output voltage Vout of the switching power supply, and the negative voltage sampling port-Voc is connected to the ground potential; at this time, the inverting input terminal voltage of the operational amplifier IC1 is
And the non-inverting input of operational amplifier IC1 is
When the output voltage Vout decreases, the voltage at the inverting input of the operational amplifier IC1 decreases and the operational amplifierThe voltage at the non-inverting input of IC1 is constant, causing the output voltage feedback port Vfb voltage to increase, thereby causing the Vout voltage to increase; when the Vout voltage increases, the Vfb voltage correspondingly decreases, so that the Vout voltage decreases, that is, the operational amplifier IC1 is in a negative feedback state, and according to the virtual short characteristic of the operational amplifier, the voltages of the non-inverting input terminal and the inverting input terminal of the operational amplifier IC1 should be kept consistent when the voltages are finally stabilized, that is, the voltages of the non-inverting input terminal and the inverting input terminal of the operational amplifier IC1 are kept consistent when the voltages are finally stabilized, that is, the voltages of the non-inverting input terminal and the inverting input terminal are consistent
Can obtain the product
Maintaining the module output voltage at the logically calculated value;
when the output voltage polarity of the applied switching power supply is negative, a negative voltage sampling port-Voc collects a signal of the output voltage Vout, and a positive voltage sampling port + Voc is connected to the ground potential; at this time, the potential of the inverting input terminal of the operational amplifier IC1 is at ground potential, and the potential of the non-inverting input terminal of the operational amplifier IC1 is at ground potential
When the absolute value of the voltage at the negative voltage sampling port-Voc is decreased, the voltage at the inverting input terminal of the operational amplifier IC1 is unchanged, while the voltage at the non-inverting input terminal of the operational amplifier IC1 is increased, resulting in an increase in the voltage at the output voltage feedback port Vfb, thereby increasing the absolute value of the voltage Vout; when the Vout voltage increases, the Vfb voltage correspondingly decreases, so that the Vout voltage decreases, that is, when the operational amplifier IC1 is in negative feedback state, the voltages of the non-inverting input terminal and the inverting input terminal of the operational amplifier IC1 should be consistent when the voltages are finally stabilized according to the virtual short characteristic of the operational amplifier, and
can obtain the product
Such that the module output voltage is maintained at the logically calculated value.
Thus, the constant voltage control circuit can control the output voltage and maintain the stability of the output voltage no matter the polarity of the output voltage is positive or negative.
It should be noted that, if the non-inverting input terminal and the inverting input terminal of the operational amplifier are exchanged, the Vfb voltage is also increased when the Vout voltage is increased, and at this time, if the logical relationship between Vout and Vfb is that the Vout voltage is decreased when the Vfb voltage is increased, the same function can be achieved as well.
In addition, the operational amplifier has a corresponding phase shift effect on a signal with a certain frequency, and the feedback of such a signal to its input terminal will make the operational amplifier operate unstably and even oscillate, so a compensation circuit composed of the third resistor R3 and the first capacitor C1 is designed in fig. 2 to compensate the phase of the operational amplifier. In fig. 2, the positions of the third resistor R3 and the first capacitor C1 may be interchanged, and when the requirement for accuracy is not high, the compensation circuit formed by the third resistor R3 and the first capacitor C1 may be omitted.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the present invention. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, such as replacing the diode or optocoupler with a MOS transistor, as is evident from the prior art, and such modifications and enhancements should be considered as within the scope of the invention and are not repeated herein. The scope of the invention should be determined from the following claims.
Claims (4)
1. A constant voltage control circuit, comprising: the circuit comprises a first resistor R1, a second resistor R2, a fourth resistor R4, a fifth resistor R5, an operational amplifier IC1, a positive voltage sampling port + Voc, a negative voltage sampling port-Voc, a ground electrode port GND, a reference voltage port Vref and an output feedback voltage port Vfb;
the positive voltage sampling port + Voc is connected with one end of a first resistor R1, the other end of the first resistor R1 is simultaneously connected with one end of a second resistor R2 and a first input end of an operational amplifier IC1, the other end of the second resistor R2 is connected with a ground terminal GND, the negative voltage sampling port-Voc is connected with one end of a fifth resistor R5, the other end of the fifth resistor R5 is simultaneously connected with one end of a fourth resistor R4 and a second input end of the operational amplifier IC1, and the other end of the fourth resistor R4 is connected with a reference voltage port Vref; the output of the operational amplifier IC1 is connected to the output feedback voltage port Vfb.
2. The constant voltage control circuit according to claim 1, wherein: the first input terminal of the operational amplifier IC1 is its inverting terminal, the second input terminal of the operational amplifier IC1 is its inverting terminal, and when the polarity of the output voltage of the applied switching power supply is positive, the positive voltage sampling port + Voc is used to collect a signal of the output voltage Vout of the switching power supply, and the negative voltage sampling port-Voc is used to connect to the ground potential.
3. The constant voltage control circuit according to claim 1, wherein: the first input terminal of the operational amplifier IC1 is the inverting terminal thereof, the second input terminal of the operational amplifier IC1 is the inverting terminal thereof, and when the polarity of the output voltage of the applied switching power supply is negative, the positive voltage sampling port + Voc is used for connecting to the ground potential, and the negative voltage sampling port-Voc is used for collecting the signal of the output voltage Vout of the switching power supply.
4. The constant voltage control circuit according to any one of claims 1 to 3, further comprising: the connection relationship between the first capacitor C1 and the third resistor R3 is as follows: one end of the third resistor R3 is connected to the output end of the operational amplifier IC1, the other end of the third resistor R3 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the first input end of the operational amplifier IC 1; or one end of the first capacitor C1 is connected to the output end of the operational amplifier IC1, the other end of the first capacitor C1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the first input end of the operational amplifier IC 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110934117.7A CN113809914B (en) | 2021-08-13 | 2021-08-13 | Constant voltage control circuit |
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| CN202110934117.7A CN113809914B (en) | 2021-08-13 | 2021-08-13 | Constant voltage control circuit |
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| CN113809914A true CN113809914A (en) | 2021-12-17 |
| CN113809914B CN113809914B (en) | 2024-06-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065249A (en) * | 2021-12-29 | 2022-09-16 | 宁波箭隆电子有限公司 | Switch power supply weighted feedback device and weighted feedback switch power supply |
| CN115390608A (en) * | 2022-07-22 | 2022-11-25 | 上海裕达实业有限公司 | Power supply control circuit and control method for residual gas analysis mass spectrum |
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| CN211701859U (en) * | 2020-04-23 | 2020-10-16 | 石家庄数英仪器有限公司 | Negative voltage input and negative voltage output switch type voltage reduction conversion circuit |
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| US5638264A (en) * | 1993-12-27 | 1997-06-10 | Hitachi, Ltd. | Parallelized power supply system providing uninterrupted operation |
| JPH0878964A (en) * | 1994-09-07 | 1996-03-22 | Fujitsu Ltd | Cross-regulation circuit for multi-output power supply |
| CN1139318A (en) * | 1995-04-27 | 1997-01-01 | 三星电子株式会社 | Voltage balancing circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115065249A (en) * | 2021-12-29 | 2022-09-16 | 宁波箭隆电子有限公司 | Switch power supply weighted feedback device and weighted feedback switch power supply |
| CN115390608A (en) * | 2022-07-22 | 2022-11-25 | 上海裕达实业有限公司 | Power supply control circuit and control method for residual gas analysis mass spectrum |
| CN115390608B (en) * | 2022-07-22 | 2024-04-09 | 上海裕达实业有限公司 | Power supply control circuit and control method for residual gas analysis mass spectrum |
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| CN113809914B (en) | 2024-06-18 |
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