CN210895157U - Voltage feedback regulating circuit - Google Patents
Voltage feedback regulating circuit Download PDFInfo
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- CN210895157U CN210895157U CN201921850223.1U CN201921850223U CN210895157U CN 210895157 U CN210895157 U CN 210895157U CN 201921850223 U CN201921850223 U CN 201921850223U CN 210895157 U CN210895157 U CN 210895157U
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Abstract
The embodiment of the application provides a voltage feedback regulating circuit, the circuit includes: the judging circuit is used for comparing the sampling voltage output by the switching power supply with a first reference voltage; the switching circuit is used for being in a first working state when the sampling voltage is greater than or equal to the first reference voltage, and is in a second working state when the sampling voltage is less than the first reference voltage; and the driving circuit is used for outputting a first driving signal to enable the switching power supply to reduce the output voltage when the switching circuit is in a first working state, and is also used for outputting a second driving signal to enable the switching power supply to improve the output voltage when the switching circuit is in a second working state. The voltage feedback adjusting circuit provided by the application can solve the problem that the output voltage of the switching power supply cannot be controlled within a design range when the output voltage of the switching power supply is higher or lower and the power supply chip cannot adjust.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a voltage feedback regulating circuit.
Background
The feedback regulating circuit is to input part or all of the output signal (voltage or current) of the circuit to be regulated to the input end of the comparator for comparison with the input signal, and to control the output of the circuit to be regulated with the effective input signal obtained by comparison.
In a general switching power supply, a power supply chip has an output voltage feedback regulation function, and the duty ratio of a driving signal of a power switching device is regulated according to the detected magnitude of one path of output voltage, for example, when the output voltage is higher, the duty ratio of the output signal of the power supply chip is reduced, and the output voltage is reduced; when the output voltage is low, the duty ratio of an output signal of the power supply chip is increased, and the output voltage is increased, so that the value of the output voltage of the switching power supply is controlled within a design range; however, when the input voltage range of the switching power supply is wide, the input voltage is high and the output load is small, and even if the switching power supply outputs with the minimum duty ratio, the output voltage still fluctuates, and at this time, the feedback regulation of the power supply chip itself cannot play a role.
Therefore, in the prior art, there is no method for controlling the output voltage of the switching power supply within the design range when the output voltage of the switching power supply is too high or too low and the power supply chip cannot adjust itself.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem in the above-mentioned technique to a certain extent at least, for this reason, the utility model aims at providing a voltage feedback regulating circuit can solve when switching power supply output voltage is on the high side or low side and power chip self can't adjust, can not make switching power supply's output voltage control problem in the design range.
The utility model provides a voltage feedback regulating circuit, the circuit includes: the judging circuit is connected with one group of output ends of the switching power supply and is used for comparing the sampling voltage output by the switching power supply with a first reference voltage and comparing the sampling voltage output by the switching power supply with a second reference voltage; the switching circuit is connected with the judging circuit and used for being in a first working state when the sampling voltage is greater than the first reference voltage and being in a second working state when the sampling voltage is less than the second reference voltage; the driving circuit is connected with the switching circuit and the switching power supply, and is used for outputting a first driving signal to enable the switching power supply to reduce the output voltage when the switching circuit is in a first working state, and outputting a second driving signal to enable the switching power supply to increase the output voltage when the switching circuit is in a second working state; wherein the first reference voltage is greater than or equal to the second reference voltage.
Optionally, the determining circuit includes: the non-inverting input end of the comparator is connected with the first voltage access end, the inverting input end of the comparator is connected with the output end of the switching power supply, and the comparator is used for outputting a first level to enable the switching circuit to be in the first working state when the sampling voltage is greater than the first reference voltage, and is also used for outputting a second level to enable the switching circuit to be in the second working state when the sampling voltage is less than the second reference voltage; and the input end of the hysteresis regulating circuit is connected with the non-inverting input end of the comparator, and the output end of the hysteresis regulating circuit is connected with the inverting input end of the comparator and used for acquiring the first reference voltage and the second reference voltage according to the first voltage so that the comparator outputs the first level or the second level when the sampling voltage exceeds a preset range, wherein the preset range is a range between the first reference voltage and the second reference voltage.
Optionally, the determining circuit further includes: the input end of the first preprocessing circuit is connected with the first voltage access end, the output end of the first preprocessing circuit is connected with the in-phase input end of the comparator and used for dividing and filtering the first voltage to obtain the first reference voltage, the second preprocessing circuit, the input end of the second preprocessing circuit is connected with the output end of the switching power supply, the output end of the second preprocessing circuit is connected with the reverse phase input end of the comparator and used for dividing and filtering the output voltage of the switching power supply to obtain the sampling voltage.
Optionally, the voltage feedback regulating circuit further includes: and the input end of the filter circuit is connected with the output end of the comparator, and the output end of the filter circuit is connected with the input end of the switch circuit and used for filtering the output signal of the judgment circuit.
Optionally, the first pre-processing circuit comprises: the first end of the first resistor is connected with the first voltage access end; a first end of the second resistor is connected with a second end of the second resistor, and the second end of the second resistor is grounded; a first end of the first capacitor is connected with a first end of the second resistor, and a second end of the first capacitor is grounded; and the first end of the third resistor is connected with the first end of the first capacitor, and the second end of the third resistor is connected with the non-inverting input end of the comparator.
Optionally, the second pre-processing circuit comprises: a first end of the fourth resistor is connected with one group of output ends of the switching power supply, and a second end of the fourth resistor is connected with an inverted input end of the comparator; a first end of the fifth resistor is connected with a second end of the fourth resistor, and a second end of the fifth resistor is grounded; and a first end of the third capacitor is connected with a first end of the fifth resistor, and a second end of the third capacitor is grounded.
Optionally, the hysteresis adjustment circuit comprises: a first end of the sixth resistor is connected with a non-inverting input end of the comparator; and the anode of the diode is connected with the second end of the sixth resistor, and the cathode of the diode is connected with the output end of the comparator.
Optionally, the filter circuit comprises: a first end of the seventh resistor is connected with the output end of the comparator, and a second end of the seventh resistor is connected with the input end of the switch circuit; and a first end of the second capacitor is connected with a second end of the seventh resistor, and a second end of the second capacitor is grounded.
Optionally, the switching circuit comprises: a primary side anode of the photoelectric coupler is connected with the second voltage input end, a primary side cathode of the photoelectric coupler is connected with the second end of the seventh resistor, a secondary side emitter of the photoelectric coupler is grounded, and a secondary side collector of the photoelectric coupler is connected with the driving circuit; and the base electrode of the triode is connected with the secondary collector electrode of the photoelectric coupler, the collector electrode of the triode is connected with the secondary emitter electrode of the photoelectric coupler, and the emitter electrode of the triode is connected with the driving circuit.
Optionally, the switching circuit further comprises: a first end of the eighth resistor is connected with the second voltage access end, and a second end of the eighth resistor is connected with the second input of the photoelectric coupler; and a first end of the ninth resistor is connected with a first end of the eighth resistor, and a second end of the ninth resistor is connected with a primary side anode of the photoelectric coupler.
Optionally, the driving circuit comprises: a tenth resistor, a first end of which is connected to the base of the triode, a second end of which is a driving signal output end, and a second end of which is also connected to the emitter of the triode; a first end of the eleventh resistor is connected to the third voltage input terminal, and a second end of the eleventh resistor is connected to the second end of the tenth resistor.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the embodiment of the application provides a voltage feedback regulating circuit, the circuit includes: the judging circuit is connected with one group of output ends of the switching power supply and is used for comparing the sampling voltage output by the switching power supply with a first reference voltage and comparing the sampling voltage output by the switching power supply with a second reference voltage; the switching circuit is connected with the judging circuit and used for being in a first working state when the sampling voltage is greater than the first reference voltage and being in a second working state when the sampling voltage is less than the second reference voltage; the driving circuit is connected with the switching circuit and the switching power supply, and is used for outputting a first driving signal to enable the switching power supply to reduce the output voltage when the switching circuit is in a first working state, and outputting a second driving signal to enable the switching power supply to increase the output voltage when the switching circuit is in a second working state; wherein the first reference voltage is greater than or equal to the second reference voltage. The voltage feedback adjusting circuit compares the sampling voltage output by the switching power supply with the reference voltage, and controls the driving signal of the switching power supply through the switching circuit, so that the switching power supply adjusts the output voltage according to the driving signal; when the sampling voltage is greater than the first reference voltage, the driving circuit sends out a first driving signal to enable the switching power supply to reduce the output voltage according to the first driving signal; when the sampling voltage is smaller than the second reference voltage, the driving circuit sends out a second driving signal to enable the switching power supply to improve the output voltage according to the second driving signal, therefore, when the sampling voltage exceeds a voltage range formed by taking the first reference voltage and the second reference voltage as boundaries, the feedback circuit can send out a corresponding trigger signal to enable the switching voltage to be reduced or increased to output the voltage, so that the effect of adjusting the output voltage of the switching power supply is achieved, and the problem that the output voltage of the switching power supply cannot be controlled within a design range when the output voltage of the switching power supply is higher or lower and the power supply chip cannot adjust per se in the prior art can be solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a block diagram of a voltage feedback regulating circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a voltage feedback regulating circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a voltage feedback regulating circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a block diagram of a voltage feedback adjusting circuit according to an embodiment of the present invention, and as shown in fig. 1, the voltage feedback adjusting circuit 100 includes:
a judging circuit 110 connected to a set of output terminals of the switching power supply 200, for comparing the sampling voltage output by the switching power supply 200 with a first reference voltage, and for comparing the sampling voltage output by the switching power supply with a second reference voltage;
the switch circuit 120 is connected to the judging circuit 110, and configured to be in a first working state when the sampling voltage is greater than the first reference voltage, and be in a second working state when the sampling voltage is less than the second reference voltage;
the driving circuit 130 is connected to the switching circuit 120, is also connected to the switching power supply 200, and is configured to output a first driving signal to enable the switching power supply 200 to reduce the output voltage when the switching circuit 100 is in a first working state, and is further configured to output a second driving signal to enable the switching power supply 200 to increase the output voltage when the switching circuit 120 is in a second working state;
wherein the first reference voltage is greater than or equal to the second reference voltage.
The voltage feedback regulating circuit that this application embodiment provided, the circuit includes: the judging circuit is connected with one group of output ends of the switching power supply and is used for comparing the sampling voltage output by the switching power supply with a first reference voltage and comparing the sampling voltage output by the switching power supply with a second reference voltage; the switching circuit is connected with the judging circuit and used for being in a first working state when the sampling voltage is greater than the first reference voltage and being in a second working state when the sampling voltage is less than the second reference voltage; the driving circuit is connected with the switching circuit and the switching power supply, and is used for outputting a first driving signal to enable the switching power supply to reduce the output voltage when the switching circuit is in a first working state, and outputting a second driving signal to enable the switching power supply to increase the output voltage when the switching circuit is in a second working state; wherein the first reference voltage is greater than or equal to the second reference voltage. The voltage feedback adjusting circuit compares the sampling voltage output by the switching power supply with the reference voltage, and controls the driving signal of the switching power supply through the switching circuit, so that the switching power supply adjusts the output voltage according to the driving signal; when the sampling voltage is greater than the first reference voltage, the driving circuit sends out a first driving signal to enable the switching power supply to reduce the output voltage according to the first driving signal; when the sampling voltage is smaller than the second reference voltage, the driving circuit sends out a second driving signal to enable the switching power supply to improve the output voltage according to the second driving signal, therefore, when the sampling voltage exceeds a voltage range formed by taking the first reference voltage and the second reference voltage as boundaries, the feedback circuit can send out a corresponding trigger signal to enable the switching voltage to be reduced or increased to output the voltage, so that the effect of adjusting the output voltage of the switching power supply is achieved, and the problem that the output voltage of the switching power supply cannot be controlled within a design range when the output voltage of the switching power supply is higher or lower and the power supply chip cannot adjust per se in the prior art can be solved.
Fig. 2 is a block diagram of a voltage feedback adjusting circuit according to an embodiment of the present invention, and as shown in fig. 2, the determining circuit 110 in the voltage feedback adjusting circuit 100 includes:
a comparator 111, a non-inverting input terminal of the comparator 111 is connected to the first voltage access terminal, and an inverting input terminal of the comparator 111 is connected to the output terminal of the switching power supply 200, and is configured to output a first level to enable the switching circuit 120 to be in the first working state when the sampling voltage is greater than the first reference voltage, and is further configured to output a second level to enable the switching circuit to be in the second working state when the sampling voltage is less than the second reference voltage; in fig. 2, the connection between the non-inverting input terminal of the comparator 111 and the first voltage input terminal and the connection between the inverting input terminal of the comparator 111 and the output terminal of the switching power supply 200 are not shown, but may be implemented in practical applications.
A hysteresis adjusting circuit 112, an input terminal of the hysteresis adjusting circuit 112 is connected to a non-inverting input terminal of the comparator 111, and an output terminal of the hysteresis adjusting circuit 112 is connected to an inverting input terminal of the comparator 111, and is configured to obtain the first reference voltage and the second reference voltage according to the first voltage, so that the comparator outputs the first level or the second level when the sampling voltage exceeds a preset range, where the preset range is a range between the first reference voltage and the second reference voltage.
The determining circuit 110 further includes:
the input end of the first preprocessing circuit 113 is connected to the first voltage access end, and the output end of the first preprocessing circuit 113 is connected to the non-inverting input end of the comparator 111, and is configured to divide and filter the first voltage to obtain the first reference voltage; and an input end of the second preprocessing circuit 114 is connected with an output end of the switching power supply 200, and an output end of the second preprocessing circuit 114 is connected with an inverting input end of the comparator 111, and is used for dividing and filtering the output voltage of the switching power supply to obtain the sampling voltage.
The circuit further comprises:
and an input end of the filter circuit 140 is connected to the output end of the comparator 111, and an output end of the filter circuit 140 is connected to the input end of the switch circuit 120, and is configured to filter an output signal of the determination circuit.
Fig. 3 is a schematic circuit diagram of a voltage feedback adjusting circuit according to an embodiment of the present invention, as shown in fig. 3, in an embodiment of the present invention, the first preprocessing circuit 113 includes:
a first resistor R1, wherein a first end of the first resistor R1 is connected to the first voltage input end; a second resistor R2, a first end of the second resistor R2 is connected with a second end of the second resistor R2, and a second end of the second resistor R2 is grounded; a first capacitor C1, a first terminal of the first capacitor C1 is connected to a first terminal of the second resistor C1, and a second terminal of the first capacitor C1 is grounded; a third resistor R3, a first terminal of the third resistor R3 is connected to a first terminal of the first capacitor C1, and a second terminal of the third resistor R3 is connected to a non-inverting input terminal of the comparator U1.
In an embodiment of the present invention, the second preprocessing circuit 114 includes:
a fourth resistor R4, a first terminal of the fourth resistor R4 is connected to a set of output terminals of the switching power supply 200, and a second terminal of the fourth resistor R4 is connected to an inverting input terminal of the comparator U1; a fifth resistor R5, wherein a first end of the fifth resistor R5 is connected with a second end of the fourth resistor R4, and a second end of the fifth resistor R5 is grounded; a third capacitor C3, wherein a first terminal of the third capacitor C3 is connected to a first terminal of the fifth resistor R5, and a second terminal of the third capacitor C3 is grounded.
In an embodiment of the present invention, the hysteresis adjusting circuit 112 includes:
a sixth resistor R6, wherein a first end of the sixth resistor R6 is connected with a non-inverting input end of the comparator U1; a diode D1, wherein the anode of the diode D1 is connected to the second terminal of the sixth resistor R6, and the cathode of the diode D1 is connected to the output terminal of the comparator U1.
In the embodiment of the present invention, the filter circuit 140 includes:
a seventh resistor R7, a first end of the seventh resistor R7 is connected to the output terminal of the comparator U1, and a second end of the seventh resistor R7 is connected to the input terminal of the switch circuit 120; a second capacitor C2, wherein a first terminal of the second capacitor C2 is connected to a second terminal of the seventh resistor R7, and a second terminal of the second capacitor C2 is grounded.
In an embodiment of the present invention, the switch circuit 120 includes:
a primary side anode of the photoelectric coupler U2 is connected to a second voltage input terminal, a primary side pin of the photoelectric coupler U2 is connected to a second terminal of the seventh resistor R7, a secondary side emitter of the photoelectric coupler U2 is grounded, and a secondary side collector of the photoelectric coupler U2 is connected to the driving circuit 130; and a transistor Q1, wherein the base of the transistor Q1 is connected with the secondary collector of the photoelectric coupler U2, the collector of the transistor Q1 is connected with the secondary emitter of the photoelectric coupler U2, and the emitter of the transistor Q1 is connected with the driving circuit 130.
In an embodiment of the present invention, the switch circuit 120 further includes:
a first end of the eighth resistor R8 is connected to the second voltage input end, and a second end of the eighth resistor R8 is connected to the primary cathode of the photocoupler U2; a ninth resistor R9, a first end of the ninth resistor R9 being connected to a first end of the eighth resistor R8, a second end of the ninth resistor R9 being connected to the primary anode of the photocoupler U2; specifically, the eighth resistor R8 is a pull-up resistor, which limits the second voltage to output the sink current to the comparator, so as to avoid the sink current from burning out the comparator U1 due to excessive magnitude, and the ninth resistor R9 controls the primary current when the photocoupler U2 is turned on, and also controls the sink current of the second voltage to the comparator U1 through the photocoupler U2 when the photocoupler U2 is turned on.
In an embodiment of the present invention, the driving circuit 130 includes:
a tenth resistor R10, wherein a first end of the tenth resistor R10 is connected to the base of the transistor Q1, a second end of the tenth resistor R10 is the driving signal output end, and a second end of the tenth resistor R10 is further connected to an emitter of the transistor Q1; an eleventh resistor R11, a first terminal of the eleventh resistor R11 being connected to the third voltage input terminal, a second terminal of the eleventh resistor R11 being connected to the second terminal of the tenth resistor R10.
It should be noted that, the first voltage, the second voltage, the third voltage, the first reference voltage and the second reference voltage mentioned in the above embodiments are set according to actual situations, in fig. 3, the access voltage VREF connected to the first end of the first resistor R1 is the first voltage, the access voltage VREF connected to the first end of the eighth resistor R8 is the second voltage, the access voltage chip VOUT connected to the first end of the eleventh resistor R11 is the third voltage, and the access voltage VCC connected to the comparator U1 may be set according to the model of the comparator U1; the third voltage input end can be a driving signal output end of the switching power supply control chip, and the eleventh resistor R11 is connected to the MOS tube of the switching power supply, so that the third voltage, the first voltage and the second voltage are not in the same network; the ground N connected to the collector of the transistor Q1 is the signal ground of the power chip, and the ground connected to the second resistor R2 and the second capacitor C2 is not common.
The embodiment of the utility model provides an in, regard as a set of output voltage of switching power supply and input the inverting input of comparator U1 after the partial pressure of second preprocessing circuit 114 and filtering with sampling voltage, first voltage is input the in-phase input of comparator U1 after the partial pressure of first preprocessing circuit 113 and filtering to make the hysteresis regulating circuit basis first voltage obtains first reference voltage with second reference voltage, comparator U1 judge whether sampling voltage surpasss with first reference voltage with the voltage range that second reference voltage constitutes as the border.
When the sampling voltage is greater than the first reference voltage, the comparator U1 outputs a low level, the primary anode of the photoelectric coupler is connected with the second voltage, the primary cathode of the photoelectric coupler is connected with the output end of the comparator, when the comparator U1 outputs a low level, the primary side of the photoelectric coupler U2 is conducted, the secondary side of the photoelectric coupler U2 is conducted and the triode Q1 is conducted, the collector of the triode Q1 is grounded, the emitter of the triode Q1 is connected with the driving signal output end, therefore, the conduction of the triode Q1 is equivalent to the grounding of the driving signal output end, the output first driving signal is a low level signal, the low level driving signal enables the primary side of the switching power supply to temporarily stop transmitting energy to the secondary side of the switching power supply, and the output voltage of the switching power supply is reduced.
When the sampling voltage is smaller than the second reference voltage, the comparator U1 outputs a high level, and the high level is larger than the second voltage, so that the primary side of the photoelectric coupler U2 is cut off, further the secondary side of the photoelectric coupler U2 and the triode Q1 are also cut off, because the output end of the driving signal is connected with the third voltage access end, the output second driving signal is a high level signal, the high level driving signal enables the primary side of the switching power supply to continuously transmit energy to the secondary side of the switching power supply, and the output voltage of the switching power supply is increased.
Therefore, the output voltage of the switching power supply is compared with the boundary voltage of the preset range, and when the output voltage is higher, the switching power supply drives the signal to reduce the output voltage through the comparator U1, the photocoupler U2 and the triode Q1; when the output voltage is low, the driving signal of the switching power supply is controlled by the comparator U1, the photoelectric coupler U2 and the triode Q1 to enable the switching power supply to increase the output voltage, and the output voltage is controlled within a preset range.
The embodiment of the application provides a voltage feedback regulating circuit, the circuit includes: the judging circuit is connected with one group of output ends of the switching power supply and is used for comparing the sampling voltage output by the switching power supply with a first reference voltage and comparing the sampling voltage output by the switching power supply with a second reference voltage; the switching circuit is connected with the judging circuit and used for being in a first working state when the sampling voltage is greater than the first reference voltage and being in a second working state when the sampling voltage is less than the second reference voltage; the driving circuit is connected with the switching circuit and the switching power supply, and is used for outputting a first driving signal to enable the switching power supply to reduce the output voltage when the switching circuit is in a first working state, and outputting a second driving signal to enable the switching power supply to increase the output voltage when the switching circuit is in a second working state; wherein the first reference voltage is greater than or equal to the second reference voltage. The voltage feedback adjusting circuit compares the sampling voltage output by the switching power supply with the reference voltage, and controls the driving signal of the switching power supply through the switching circuit, so that the switching power supply adjusts the output voltage according to the driving signal; when the sampling voltage is greater than the first reference voltage, the driving circuit sends out a first driving signal to enable the switching power supply to reduce the output voltage according to the first driving signal; when the sampling voltage is smaller than the second reference voltage, the driving circuit sends out a second driving signal to enable the switching power supply to improve the output voltage according to the second driving signal, therefore, when the sampling voltage exceeds a voltage range formed by taking the first reference voltage and the second reference voltage as boundaries, the feedback circuit can send out a corresponding trigger signal to enable the switching voltage to be reduced or increased to output the voltage, so that the effect of adjusting the output voltage of the switching power supply is achieved, and the problem that the output voltage of the switching power supply cannot be controlled within a design range when the output voltage of the switching power supply is higher or lower and the power supply chip cannot adjust per se in the prior art can be solved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A voltage feedback regulation circuit, the circuit comprising:
the judging circuit is connected with one group of output ends of the switching power supply and is used for comparing the sampling voltage output by the switching power supply with a first reference voltage and comparing the sampling voltage output by the switching power supply with a second reference voltage;
the switching circuit is connected with the judging circuit and used for being in a first working state when the sampling voltage is greater than the first reference voltage and being in a second working state when the sampling voltage is less than the second reference voltage;
the driving circuit is connected with the switching circuit and the switching power supply, and is used for outputting a first driving signal to enable the switching power supply to reduce the output voltage when the switching circuit is in the first working state, and outputting a second driving signal to enable the switching power supply to increase the output voltage when the switching circuit is in the second working state;
wherein the first reference voltage is greater than or equal to the second reference voltage.
2. The circuit of claim 1, wherein the decision circuit comprises:
the non-inverting input end of the comparator is connected with the first voltage access end, the inverting input end of the comparator is connected with the output end of the switching power supply, and the comparator is used for outputting a first level to enable the switching circuit to be in the first working state when the sampling voltage is greater than the first reference voltage, and is also used for outputting a second level to enable the switching circuit to be in the second working state when the sampling voltage is less than the second reference voltage;
and the input end of the hysteresis regulating circuit is connected with the non-inverting input end of the comparator, and the output end of the hysteresis regulating circuit is connected with the inverting input end of the comparator and used for acquiring the first reference voltage and the second reference voltage according to the first voltage so that the comparator outputs the first level or the second level when the sampling voltage exceeds a preset range, wherein the preset range is a range between the first reference voltage and the second reference voltage.
3. The circuit of claim 2, wherein the decision circuit further comprises:
the input end of the first preprocessing circuit is connected with the first voltage access end, and the output end of the first preprocessing circuit is connected with the non-inverting input end of the comparator and used for dividing and filtering the first voltage to obtain the first reference voltage;
the input end of the second preprocessing circuit is connected with the output end of the switching power supply, and the output end of the second preprocessing circuit is connected with the inverting input end of the comparator and used for dividing and filtering the output voltage of the switching power supply to obtain the sampling voltage;
the voltage feedback adjustment circuit further comprises:
and the input end of the filter circuit is connected with the output end of the comparator, and the output end of the filter circuit is connected with the input end of the switch circuit and used for filtering the output signal of the judgment circuit.
4. The circuit of claim 3, wherein the first pre-processing circuit comprises:
the first end of the first resistor is connected with the first voltage access end;
a first end of the second resistor is connected with a second end of the second resistor, and the second end of the second resistor is grounded;
a first end of the first capacitor is connected with a first end of the second resistor, and a second end of the first capacitor is grounded;
and the first end of the third resistor is connected with the first end of the first capacitor, and the second end of the third resistor is connected with the non-inverting input end of the comparator.
5. The circuit of claim 3, wherein the second pre-processing circuit comprises:
a first end of the fourth resistor is connected with one group of output ends of the switching power supply, and a second end of the fourth resistor is connected with an inverted input end of the comparator;
a first end of the fifth resistor is connected with a second end of the fourth resistor, and a second end of the fifth resistor is grounded;
and a first end of the third capacitor is connected with a first end of the fifth resistor, and a second end of the third capacitor is grounded.
6. The circuit of claim 2, wherein the hysteretic regulation circuit comprises:
a first end of the sixth resistor is connected with a non-inverting input end of the comparator;
and the anode of the diode is connected with the second end of the sixth resistor, and the cathode of the diode is connected with the output end of the comparator.
7. The circuit of claim 3, wherein the filtering circuit comprises:
a first end of the seventh resistor is connected with the output end of the comparator, and a second end of the seventh resistor is connected with the input end of the switch circuit;
and a first end of the second capacitor is connected with a second end of the seventh resistor, and a second end of the second capacitor is grounded.
8. The circuit of claim 7, wherein the switching circuit comprises:
a primary side anode of the photoelectric coupler is connected with the second voltage input end, a primary side cathode of the photoelectric coupler is connected with the second end of the seventh resistor, a secondary side emitter of the photoelectric coupler is grounded, and a secondary side collector of the photoelectric coupler is connected with the driving circuit;
and the base electrode of the triode is connected with the secondary collector electrode of the photoelectric coupler, the collector electrode of the triode is connected with the secondary emitter electrode of the photoelectric coupler, and the emitter electrode of the triode is connected with the driving circuit.
9. The circuit of claim 8, wherein the switching circuit further comprises:
a first end of the eighth resistor is connected with the second voltage access end, and a second end of the eighth resistor is connected with the second input of the photoelectric coupler;
and a first end of the ninth resistor is connected with a first end of the eighth resistor, and a second end of the ninth resistor is connected with a primary side anode of the photoelectric coupler.
10. The circuit of claim 9, wherein the drive circuit comprises:
a tenth resistor, a first end of which is connected to the base of the triode, a second end of which is a driving signal output end, and a second end of which is also connected to the emitter of the triode;
a first end of the eleventh resistor is connected to the third voltage input terminal, and a second end of the eleventh resistor is connected to the second end of the tenth resistor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111831042A (en) * | 2020-07-13 | 2020-10-27 | 南方电网数字电网研究院有限公司 | Energy collecting and conditioning system |
| CN112558674A (en) * | 2020-12-02 | 2021-03-26 | 浙江中控技术股份有限公司 | Analog quantity current output system |
-
2019
- 2019-10-30 CN CN201921850223.1U patent/CN210895157U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111831042A (en) * | 2020-07-13 | 2020-10-27 | 南方电网数字电网研究院有限公司 | Energy collecting and conditioning system |
| CN111831042B (en) * | 2020-07-13 | 2022-07-05 | 南方电网数字电网研究院有限公司 | Energy collecting and conditioning system |
| CN112558674A (en) * | 2020-12-02 | 2021-03-26 | 浙江中控技术股份有限公司 | Analog quantity current output system |
| CN112558674B (en) * | 2020-12-02 | 2023-02-21 | 浙江中控技术股份有限公司 | Analog quantity current output system |
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