CN216449955U - High-voltage switch power supply feedback loop and high-voltage switch power supply - Google Patents
High-voltage switch power supply feedback loop and high-voltage switch power supply Download PDFInfo
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Abstract
The utility model provides a high-voltage switching power supply feedback loop and a high-voltage switching power supply, wherein the feedback loop comprises an adjustable programmable reference, a phase compensation circuit, a photoelectric coupler, a seventh resistor, an eighth resistor and a tenth resistor; the collector and the emitter of the photoelectric coupler are connected with a first feedback end of a switching power supply and a second feedback end of the switching power supply, the anode of the photoelectric coupler is connected with one end of a tenth resistor and a first rectification output signal end of the switching power supply, the cathode of the photoelectric coupler is connected with the other end of the tenth resistor, one end of a phase compensation circuit and the cathode end of an adjustable programmable reference, the anode end of the adjustable programmable reference is connected with one end of an eighth resistor and the output ground of the switching power supply, the other end of the eighth resistor is connected with one end of a seventh resistor, the other end of the phase compensation circuit and an external input reference end of the adjustable programmable reference, and the other end of the seventh resistor is connected with a second rectification output signal end of the switching power supply. The high-voltage switching power supply with adjustable output voltage of 36V to kV can be obtained.
Description
Technical Field
The utility model belongs to the technical field of electronics, and particularly relates to a feedback loop of a high-voltage switching power supply and the high-voltage switching power supply.
Background
The programmable reference is an adjustable three-terminal parallel voltage-stabilizing unit circuit, and is mainly applied to forming a reference voltage source or a feedback loop of a switching power supply. For a reference voltage source with a reference voltage lower than 36V or a feedback loop of a switching power supply with a fixed or adjustable output voltage, an integrated circuit similar to TL431 is used, and the integrated circuit is the preferred circuit except for a Zener diode, and the obtained reference voltage source or the switching power supply has high precision, good stability and low cost. For the feedback loop of the precision switching power supply with the reference voltage higher than 36V, particularly the feedback loop of the precision switching power supply with the adjustable output voltage, the error of a Zener diode with fixed voltage is large and is not available, and a proper integrated circuit or a precision programmable reference unit circuit is not available.
For the above reasons, for a precision switching power supply with a maximum output voltage of 36V or more, especially for a precision switching power supply with an adjustable output voltage, a feedback loop does not have a suitable integrated circuit or a precision programmable reference unit circuit available, and the current implementation method is as follows: the output dynamic voltage measured by using a resistance voltage division method is directly fed back, the stability of the method and the response time of a feedback loop are difficult to be considered, and the stability of a power supply is poor; secondly, the output of a low-voltage output winding of the same transformer is used for feedback, and the required voltage is output by using a high-voltage output winding, so that the method is limited by the error among the windings, and the obtained output voltage has poor precision; and thirdly, the high-voltage output voltage is obtained by using advanced means, such as a quick-response high-voltage measuring sensor, the required high-voltage switching power supply can be obtained by the method, but the quick-response high-voltage measuring sensor is expensive, the product of the sensor is basically invisible in the market, and the economy is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a feedback loop of a high-voltage switching power supply and the high-voltage switching power supply, and aims to solve the problem that the feedback loop does not have a proper integrated circuit or a programmable reference unit circuit for the high-voltage switching power supply with adjustable output voltage with the highest output voltage of more than 36V.
In a first aspect, the present invention provides a reference-adjustable feedback loop for a high-voltage switching power supply, including: the circuit comprises an adjustable programmable reference, a phase compensation circuit, a photoelectric coupler U4, a seventh resistor R7, an eighth resistor R8 and a tenth resistor R10; the collector and the emitter of the photocoupler U4 are respectively connected with a first feedback end FB1 of the switching power supply and a second feedback end FB2 of the switching power supply, the anode of the photocoupler U4 is connected with one end of a tenth resistor R10 and a first rectification output signal end S1 of the switching power supply, the cathode of the photocoupler U4 is connected with the other end of a tenth resistor R10, one end 1 of the phase compensation circuit and the cathode end K of the adjustable programmable reference, the anode end A of the adjustable programmable reference is connected with one end of an eighth resistor R8 and the output ground GND of the switching power supply, the other end of the eighth resistor R8 is connected with one end of a seventh resistor R7, the other end 2 of the phase compensation circuit and the external input reference end REF of the adjustable programmable reference, and the other end of the seventh resistor R7 is connected with a second rectification output signal end S2 of the switching power supply.
Further, the adjustable programmable reference comprises a transistor Q1, a first operational amplifier U1, a low-pass filter, a fifth resistor R5, a potentiometer VR1, an internal signal ground F, and an internal reference source; a collector or a drain of the transistor Q1 is connected to the cathode terminal K of the adjustable programmable reference, an emitter or a source of the transistor Q1 is connected to the ground terminal of the first operational amplifier U1 and one end of the fifth resistor R5, the ground terminal of the low pass filter, the ground terminal of the internal reference source, the internal signal ground F and the anode terminal a of the adjustable programmable reference, a base or a gate of the transistor Q1 is connected to the output terminal of the first operational amplifier U1, the power terminal of the first operational amplifier U1 is connected to the power terminal of the low pass filter, the input terminal of the internal reference source and the auxiliary power terminal VCC, a non-inverting input terminal of the first operational amplifier U1 is connected to the external input reference terminal REF of the adjustable programmable reference, an inverting input terminal of the first operational amplifier U1 is connected to the output terminal of the low pass filter, an input terminal of the low pass filter is connected to a fixed terminal of the potentiometer VR1 and the other end of the fifth resistor R5, the sliding end of the potentiometer VR1 is connected with the other fixed end of the potentiometer VR1 and the output end of the internal reference source; the collector or drain of the transistor Q1 is open inside the adjustable programmable high voltage reference cell circuit.
In a second aspect, the present invention provides a high voltage switching power supply, where the high voltage switching power supply includes the feedback loop of the high voltage switching power supply, and further includes a high voltage switching power supply control and output rectification circuit, an eighth capacitor C8, a first inductor L1, and a ninth capacitor C9; a first switch power supply rectification output signal end S1 of the high-voltage switch power supply feedback loop is connected with a switch power supply rectification output end Vro of the high-voltage switch power supply control and output rectification circuit, one end of an eighth capacitor C8 and one end of a first inductor L1, the other end of an eighth capacitor C8 is connected with one end of a ninth capacitor C9, a grounding end GND of the high-voltage switch power supply control and output rectification circuit, a grounding end GND of the high-voltage switch power supply feedback loop and a switching power supply output ground GND, the other end of a first inductor L1 is connected with the other end of the ninth capacitor C9, a second switch power supply rectification output signal end S2 of the high-voltage switch power supply feedback loop and a switch power supply output end Vo, a first switch power supply feedback end FB1 of the high-voltage switch power supply feedback loop is connected with a first feedback end FB3 of the high-voltage switch power supply control and output rectification circuit, and a second switch power supply feedback end FB2 of the high-voltage switch power supply feedback loop is connected with the high-voltage switch power supply control and output rectification circuit And a second feedback terminal FB4 of the control and output rectifying circuit.
Further, the high-voltage switch power supply control and output rectification circuit comprises an FB local circuit, an input pulse width modulation controller, a power switch local circuit, a transformer isolation output local circuit and a rectifier diode D1; the cathode of the rectifier diode D1 is connected with the switch power supply rectification output end Vro of the high-voltage switch power supply control and output rectification circuit, the anode of the rectifier diode D1 is connected with the first end of the transformer isolation output local circuit, the second end of the transformer isolation output local circuit is connected with the input pulse width modulation controller and one end of the power switch local circuit, the third end of the transformer isolation output local circuit is connected with the grounding end GND of the high-voltage switch power supply control and output rectification circuit, the other ends of the input pulse width modulation controller and the power switch local circuit are connected with a first end of the FB local circuit, a second end of the FB local circuit is connected with a first feedback end FB3 of the high-voltage switch power supply control and output rectification circuit, and a third end of the FB local circuit is connected with a second feedback end FB4 of the high-voltage switch power supply control and output rectification circuit.
In the utility model, the feedback loop of the high-voltage switching power supply comprises the adjustable programmable reference, so that the high-voltage switching power supply with adjustable output voltage of which the highest output voltage is more than 36V to kV level can be obtained conveniently at low cost.
Drawings
Fig. 1 is a schematic diagram of a feedback loop of a high-voltage switching power supply according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of another feedback loop of a high-voltage switching power supply according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a high-voltage switching power supply according to a second embodiment of the present invention.
Fig. 4 is a schematic diagram of another feedback loop of a high-voltage switching power supply according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of another high-voltage switching power supply according to a second embodiment of the present invention.
Fig. 6 is a specific circuit diagram of a high-voltage switching power supply according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
The first embodiment is as follows:
referring to fig. 1, an embodiment of the present invention provides a reference-adjustable feedback loop of a high-voltage switching power supply, including: the circuit comprises an adjustable programmable reference, a phase compensation circuit, a photoelectric coupler U4, a seventh resistor R7, an eighth resistor R8 and a tenth resistor R10; the collector and the emitter of the photocoupler U4 are respectively connected with a first feedback end FB1 of the switching power supply and a second feedback end FB2 of the switching power supply, the anode of the photocoupler U4 is connected with one end of a tenth resistor R10 and a first rectification output signal end S1 of the switching power supply, the cathode of the photocoupler U4 is connected with the other end of a tenth resistor R10, one end 1 of the phase compensation circuit and the cathode end K of the adjustable programmable reference, the anode end A of the adjustable programmable reference is connected with one end of an eighth resistor R8 and the output ground GND of the switching power supply, the other end of the eighth resistor R8 is connected with one end of a seventh resistor R7, the other end 2 of the phase compensation circuit and the external input reference end REF of the adjustable programmable reference, and the other end of the seventh resistor R7 is connected with a second rectification output signal end S2 of the switching power supply.
In the first embodiment of the present invention, referring to fig. 2, the adjustable programmable reference includes a transistor Q1, a first operational amplifier U1, a low pass filter, a fifth resistor R5, a potentiometer VR1, an internal signal ground F, and an internal reference source; a collector or a drain of the transistor Q1 is connected to the cathode terminal K of the adjustable programmable reference, an emitter or a source of the transistor Q1 is connected to the ground terminal of the first operational amplifier U1 and one end of the fifth resistor R5, the ground terminal of the low pass filter, the ground terminal of the internal reference source, the internal signal ground F and the anode terminal a of the adjustable programmable reference, a base or a gate of the transistor Q1 is connected to the output terminal of the first operational amplifier U1, the power terminal of the first operational amplifier U1 is connected to the power terminal of the low pass filter, the input terminal of the internal reference source and the auxiliary power terminal VCC, a non-inverting input terminal of the first operational amplifier U1 is connected to the external input reference terminal REF of the adjustable programmable reference, an inverting input terminal of the first operational amplifier U1 is connected to the output terminal of the low pass filter, an input terminal of the low pass filter is connected to a fixed terminal of the potentiometer VR1 and the other end of the fifth resistor R5, the sliding end of the potentiometer VR1 is connected with the other fixed end of the potentiometer VR1 and the output end of the internal reference source; the collector or drain of the transistor Q1 is open inside the adjustable programmable high voltage reference cell circuit.
In the first embodiment of the present invention, the transistor Q1 includes a bipolar transistor, a junction field effect transistor, a metal oxide semiconductor field effect transistor, a silicon carbide metal oxide semiconductor field effect transistor, and an insulated gate bipolar transistor.
In the first embodiment of the present invention, the first operational amplifier U1 includes a rail-to-rail operational amplifier and a non-rail-to-rail operational amplifier.
In the first embodiment of the present invention, the internal reference source includes a programmable reference integrated circuit U2 and a sixth resistor R6; one end of the sixth resistor R6 is connected to the input end of the internal reference source, the other end of the sixth resistor R6 is connected to the cathode end and the reference end of the programmable reference integrated circuit U2 and the output end of the internal reference source, and the anode end of the programmable reference integrated circuit U2 is connected to the ground end of the internal reference source.
In the first embodiment of the present invention, the low-pass filter includes a second operational amplifier U3, a third capacitor C3, and a third resistor R3; one end of the third capacitor C3 is connected to the ground terminal of the second operational amplifier U3 and the ground terminal of the low-pass filter, the other end of the third capacitor C3 is connected to one end of the third resistor R3 and the output terminal of the low-pass filter, the other end of the third resistor R3 is connected to the output terminal and the inverting input terminal of the second operational amplifier U3, the non-inverting input terminal of the second operational amplifier U3 is connected to the input terminal of the low-pass filter, and the power supply terminal of the second operational amplifier U3 is connected to the power supply terminal of the low-pass filter.
In the first embodiment of the present invention, the adjustable programmable reference further includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, and a fifth capacitor C5; two ends of the first resistor R1 are respectively connected to the output end of the first operational amplifier U1 and the base or gate of the transistor Q1, two ends of the second capacitor C2 are respectively connected to the anode end a of the adjustable programmable reference and the base or gate of the transistor Q1, two ends of the first capacitor C1 are respectively connected to the power end and the ground end of the first operational amplifier U1, two ends of the second resistor R2 are respectively connected between the anode end a of the adjustable programmable reference and the emitter or source of the transistor Q1, one end of the fifth capacitor C5 is connected to the output end of the internal reference source, and the other end of the fifth capacitor C5 is connected to the ground end of the internal reference source. With particular reference to fig. 4.
In the first embodiment of the present invention, the phase compensation circuit includes a sixth capacitor C6, a seventh capacitor C7, and an eleventh resistor R11; one end of the sixth capacitor C6 is connected to one end of a seventh capacitor C7 and one end 1 of the phase compensation circuit, the other end of the seventh capacitor C7 is connected to one end of an eleventh resistor R11, and the other end of the sixth capacitor C6 is connected to the other end of the eleventh resistor R11 and the other end 2 of the phase compensation circuit.
The circuit principle is as follows:
the auxiliary power supply terminal VCC generates an internal reference voltage through a programmable reference integrated circuit U2, a sixth resistor R6 and a fifth capacitor C5, the internal reference voltage is divided by VR1 and R5 to obtain a voltage, the voltage is filtered by a low-pass filter consisting of second operational amplifiers U3, R3 and C3 to generate an adjustable internal reference voltage at Vref, the inverting input end of the first operational amplifier U1 is connected with the internal reference voltage Vref, the non-inverting input end of the first operational amplifier U1 is connected with an external reference feedback signal through an external input reference end REF, the output end of the first operational amplifier U1 is connected with the base or gate of a transistor Q1 through a first resistor R1 and a second capacitor C2 of an integrating circuit, and negative feedback is formed by the impedance between the cathode terminal K and the anode terminal A and the voltage difference between the external reference feedback signal and the internal reference voltage Vref. When the voltage on the C8 is increased, the current of a light emitting diode of the photoelectric coupler U4 is increased, a negative feedback signal is enhanced, and the voltage on the C8 is stably dropped under the control of the switching power supply; when the voltage on the C8 is reduced, the current of a light emitting diode of the photoelectric coupler U4 is reduced, a negative feedback signal is weakened, and the voltage on the C8 is stably raised back under the control of the switching power supply; when the voltage on the C9 is increased, the voltage on the R8(REF) is increased, the voltage on the base electrode or the grid electrode of the transistor Q1 is increased, the voltage between the collector electrode and the emitter electrode (or between the drain electrode and the source electrode) of the transistor Q1 is reduced, the current of the light emitting diode of the photoelectric coupler U4 is increased, a negative feedback signal is enhanced, and the voltage on the C8 is stably dropped under the control of the switching power supply, so that the voltage on the C9 is stably dropped; when the voltage at C9 decreases, the voltage at R8(REF) decreases, the base or gate voltage of the transistor Q1 decreases, the voltage between the collector and the emitter (or between the drain and the source) of the transistor Q1 increases, the led current of the photocoupler U4 decreases, the negative feedback signal decreases, and the switching power supply controls to make the voltage at C8 rise stably, so that the voltage at C9 rises stably. The output voltage Vo of the switching power supply is Vref (R7+ R8)/R8.
In the embodiment of the utility model, the feedback loop of the high-voltage switching power supply comprises the adjustable programmable reference, so that the high-voltage switching power supply with adjustable output voltage of which the highest output voltage is more than 36V to kV level can be obtained conveniently and at low cost.
Example two:
referring to fig. 3 and 5, a second embodiment of the present invention provides a high-voltage switching power supply, where the high-voltage switching power supply includes the high-voltage switching power supply feedback loop, and further includes a high-voltage switching power supply control and output rectification circuit, an eighth capacitor C8, a first inductor L1, and a ninth capacitor C9; the first switch power supply rectification output signal end S1 of the high-voltage switch power supply feedback loop is connected with the switch power supply rectification output end Vro of the high-voltage switch power supply control and output rectification circuit, one end of an eighth capacitor C8 and one end of a first inductor L1, the other end of the eighth capacitor C8 is connected with one end of a ninth capacitor C9, the grounding end GND of the high-voltage switch power supply control and output rectification circuit, the grounding end GND of the high-voltage switch power supply feedback loop and the grounding end GND of the switch power supply output, the other end of a first inductor L1 is connected with the other end of the ninth capacitor C9, the second switch power supply rectification output signal end S2 of the high-voltage switch power supply feedback loop and the switch power supply output end FB Vo, the first switch power supply feedback end FB1 of the high-voltage switch power supply feedback loop is connected with the first feedback end 3 of the high-voltage switch power supply control and output rectification circuit, and the second switch power supply feedback end FB2 of the high-voltage switch power supply feedback loop is connected with the high-voltage switch power supply control and output rectification circuit And a second feedback terminal FB4 of the output rectifying circuit.
In the second embodiment of the present invention, the high-voltage switching power supply control and output rectification circuit includes an FB local circuit, an input pulse width modulation controller, a power switch local circuit, a transformer isolation output local circuit, and a rectifier diode D1; the cathode of the rectifier diode D1 is connected with the switch power supply rectification output end Vro of the high-voltage switch power supply control and output rectification circuit, the anode of the rectifier diode D1 is connected with the first end of the transformer isolation output local circuit, the second end of the transformer isolation output local circuit is connected with the input pulse width modulation controller and one end of the power switch local circuit, the third end of the transformer isolation output local circuit is connected with the grounding end GND of the high-voltage switch power supply control and output rectification circuit, the other ends of the input pulse width modulation controller and the power switch local circuit are connected with a first end of the FB local circuit, a second end of the FB local circuit is connected with a first feedback end FB3 of the high-voltage switch power supply control and output rectification circuit, and a third end of the FB local circuit is connected with a second feedback end FB4 of the high-voltage switch power supply control and output rectification circuit.
Fig. 6 is a specific circuit diagram of a high voltage switching power supply including an adjustable programmable reference.
In the embodiment of the utility model, the high-voltage switching power supply comprises the adjustable programmable reference, and the high-voltage switching power supply with adjustable output voltage of which the highest output voltage is more than 36V to kV level can be obtained conveniently at low cost.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A high voltage switching power supply feedback loop, comprising: the circuit comprises an adjustable programmable reference, a phase compensation circuit, a photoelectric coupler U4, a seventh resistor R7, an eighth resistor R8 and a tenth resistor R10; the collector and the emitter of the photocoupler U4 are respectively connected with a first feedback end FB1 of the switching power supply and a second feedback end FB2 of the switching power supply, the anode of the photocoupler U4 is connected with one end of a tenth resistor R10 and a first rectification output signal end S1 of the switching power supply, the cathode of the photocoupler U4 is connected with the other end of a tenth resistor R10, one end 1 of the phase compensation circuit and the cathode end K of the adjustable programmable reference, the anode end A of the adjustable programmable reference is connected with one end of an eighth resistor R8 and the output ground GND of the switching power supply, the other end of the eighth resistor R8 is connected with one end of a seventh resistor R7, the other end 2 of the phase compensation circuit and the external input reference end REF of the adjustable programmable reference, and the other end of the seventh resistor R7 is connected with a second rectification output signal end S2 of the switching power supply.
2. The high voltage switching power supply feedback loop of claim 1, wherein said adjustable programmable reference comprises a transistor Q1, a first operational amplifier U1, a low pass filter, a fifth resistor R5, a potentiometer VR1, an internal signal ground F, an internal reference source; a collector or a drain of the transistor Q1 is connected to the cathode terminal K of the adjustable programmable reference, an emitter or a source of the transistor Q1 is connected to the ground terminal of the first operational amplifier U1 and one end of the fifth resistor R5, the ground terminal of the low pass filter, the ground terminal of the internal reference source, the internal signal ground F and the anode terminal a of the adjustable programmable reference, a base or a gate of the transistor Q1 is connected to the output terminal of the first operational amplifier U1, the power terminal of the first operational amplifier U1 is connected to the power terminal of the low pass filter, the input terminal of the internal reference source and the auxiliary power terminal VCC, a non-inverting input terminal of the first operational amplifier U1 is connected to the external input reference terminal REF of the adjustable programmable reference, an inverting input terminal of the first operational amplifier U1 is connected to the output terminal of the low pass filter, an input terminal of the low pass filter is connected to a fixed terminal of the potentiometer VR1 and the other end of the fifth resistor R5, the sliding end of the potentiometer VR1 is connected with the other fixed end of the potentiometer VR1 and the output end of the internal reference source; the collector or drain of the transistor Q1 is open inside the adjustable programmable high voltage reference cell circuit.
3. The high voltage switching power supply feedback loop of claim 2 wherein said transistor Q1 comprises a bipolar transistor, a junction field effect transistor, a metal oxide semiconductor field effect transistor, a silicon carbide metal oxide semiconductor field effect transistor, and an insulated gate bipolar transistor.
4. The high voltage switching power supply feedback loop of claim 2 wherein said low pass filter comprises a second operational amplifier U3, a third capacitor C3, and a third resistor R3; one end of the third capacitor C3 is connected to the ground terminal of the second operational amplifier U3 and the ground terminal of the low-pass filter, the other end of the third capacitor C3 is connected to one end of the third resistor R3 and the output terminal of the low-pass filter, the other end of the third resistor R3 is connected to the output terminal and the inverting input terminal of the second operational amplifier U3, the non-inverting input terminal of the second operational amplifier U3 is connected to the input terminal of the low-pass filter, and the power supply terminal of the second operational amplifier U3 is connected to the power supply terminal of the low-pass filter.
5. The high voltage switching power supply feedback loop of claim 2 wherein said first operational amplifier U1 comprises a rail-to-rail operational amplifier and a non-rail-to-rail operational amplifier.
6. The high voltage switching power supply feedback loop of claim 2 wherein said internal reference source comprises a programmable reference integrated circuit U2 and a sixth resistor R6; one end of the sixth resistor R6 is connected to the input end of the internal reference source, the other end of the sixth resistor R6 is connected to the cathode end and the reference end of the programmable reference integrated circuit U2 and the output end of the internal reference source, and the anode end of the programmable reference integrated circuit U2 is connected to the ground end of the internal reference source.
7. The high voltage switching power supply feedback loop of claim 2 wherein said adjustable programmable reference further comprises a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2 and a fifth capacitor C5; two ends of the first resistor R1 are respectively connected to the output end of the first operational amplifier U1 and the base or gate of the transistor Q1, two ends of the second capacitor C2 are respectively connected to the anode end a of the adjustable programmable reference and the base or gate of the transistor Q1, two ends of the first capacitor C1 are respectively connected to the power end and the ground end of the first operational amplifier U1, two ends of the second resistor R2 are respectively connected between the anode end a of the adjustable programmable reference and the emitter or source of the transistor Q1, one end of the fifth capacitor C5 is connected to the output end of the internal reference source, and the other end of the fifth capacitor C5 is connected to the ground end of the internal reference source.
8. The high voltage switching power supply feedback loop of claim 1, wherein said phase compensation circuit comprises a sixth capacitor C6, a seventh capacitor C7, and an eleventh resistor R11; one end of the sixth capacitor C6 is connected to one end of a seventh capacitor C7 and one end 1 of the phase compensation circuit, the other end of the seventh capacitor C7 is connected to one end of an eleventh resistor R11, and the other end of the sixth capacitor C6 is connected to the other end of the eleventh resistor R11 and the other end 2 of the phase compensation circuit.
9. A high-voltage switching power supply, characterized in that the high-voltage switching power supply comprises the high-voltage switching power supply feedback loop as claimed in any one of claims 1 to 8, and further comprises a high-voltage switching power supply control and output rectification circuit, an eighth capacitor C8, a first inductor L1, a ninth capacitor C9; a first switch power supply rectification output signal end S1 of the high-voltage switch power supply feedback loop is connected with a switch power supply rectification output end Vro of the high-voltage switch power supply control and output rectification circuit, one end of an eighth capacitor C8 and one end of a first inductor L1, the other end of an eighth capacitor C8 is connected with one end of a ninth capacitor C9, a grounding end GND of the high-voltage switch power supply control and output rectification circuit, a grounding end GND of the high-voltage switch power supply feedback loop and a switching power supply output ground GND, the other end of a first inductor L1 is connected with the other end of the ninth capacitor C9, a second switch power supply rectification output signal end S2 of the high-voltage switch power supply feedback loop and a switch power supply output end Vo, a first switch power supply feedback end FB1 of the high-voltage switch power supply feedback loop is connected with a first feedback end FB3 of the high-voltage switch power supply control and output rectification circuit, and a second switch power supply feedback end FB2 of the high-voltage switch power supply feedback loop is connected with the high-voltage switch power supply control and output rectification circuit And a second feedback terminal FB4 of the output rectifying circuit.
10. The high voltage switching power supply of claim 9 wherein said high voltage switching power supply control and output rectification circuitry comprises FB local circuitry, input pwm controller and power switch local circuitry, transformer isolated output local circuitry, rectifier diode D1; the cathode of the rectifier diode D1 is connected with the switch power supply rectification output end Vro of the high-voltage switch power supply control and output rectification circuit, the anode of the rectifier diode D1 is connected with the first end of the transformer isolation output local circuit, the second end of the transformer isolation output local circuit is connected with the input pulse width modulation controller and one end of the power switch local circuit, the third end of the transformer isolation output local circuit is connected with the grounding end GND of the high-voltage switch power supply control and output rectification circuit, the other ends of the input pulse width modulation controller and the power switch local circuit are connected with a first end of the FB local circuit, a second end of the FB local circuit is connected with a first feedback end FB3 of the high-voltage switch power supply control and output rectification circuit, and a third end of the FB local circuit is connected with a second feedback end FB4 of the high-voltage switch power supply control and output rectification circuit.
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| CN202120749612.6U CN216449955U (en) | 2021-04-13 | 2021-04-13 | High-voltage switch power supply feedback loop and high-voltage switch power supply |
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| CN202120749612.6U CN216449955U (en) | 2021-04-13 | 2021-04-13 | High-voltage switch power supply feedback loop and high-voltage switch power supply |
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