CN116760261A - Power supply circuit with adjustable frequency and power supply device - Google Patents

Power supply circuit with adjustable frequency and power supply device Download PDF

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Publication number
CN116760261A
CN116760261A CN202310530747.7A CN202310530747A CN116760261A CN 116760261 A CN116760261 A CN 116760261A CN 202310530747 A CN202310530747 A CN 202310530747A CN 116760261 A CN116760261 A CN 116760261A
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China
Prior art keywords
voltage
output
module
power supply
signal
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Pending
Application number
CN202310530747.7A
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Chinese (zh)
Inventor
段峻
陈弢文
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Shanghai Xinxiangcheng Semiconductor Co ltd
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Shanghai Xinxiangcheng Semiconductor Co ltd
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Application filed by Shanghai Xinxiangcheng Semiconductor Co ltd filed Critical Shanghai Xinxiangcheng Semiconductor Co ltd
Priority to CN202310530747.7A priority Critical patent/CN116760261A/en
Publication of CN116760261A publication Critical patent/CN116760261A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a frequency-adjustable power supply circuit and a power supply device, wherein the power supply circuit comprises: the power conversion module is used for receiving a control signal containing a state control instruction and PWM pulses, converting input voltage into output voltage according to the PWM pulses when the state control instruction instructs to enter a working mode, and stopping conversion when the state control instruction instructs to enter a sleep mode; the hysteresis comparison module is used for comparing the sampling voltage of the output voltage with a programmable reference voltage to obtain a hysteresis comparison signal; the sleep control module is used for outputting a corresponding wake-up signal when the time length of the power conversion module in the sleep mode is longer than the preset maximum sleep time length; the logic control module is used for generating a state control instruction in the control signal according to the hysteresis comparison signal and the wake-up signal and generating PWM pulses in the control signal according to the input voltage. The invention can realize the adjustment of the working frequency of the power supply circuit and reduce the application limit on sensitive equipment in certain frequency bands.

Description

Power supply circuit with adjustable frequency and power supply device
Technical Field
The present invention relates to the field of power supply circuits, and in particular, to a frequency-adjustable power supply circuit and a power supply device.
Background
Conventional power supply circuits are limited in their application to devices that are sensitive to certain frequency bands because the switching frequency is variable with load and input voltage and can easily enter sensitive frequency bands.
Disclosure of Invention
In view of the foregoing drawbacks of the prior art, an object of the present invention is to provide a frequency-adjustable power supply circuit and a power supply device, so as to reduce the application limitation of the power supply circuit to some frequency band sensitive devices.
In order to achieve the above object, the present invention provides the following technical solutions:
in a first aspect, the present invention provides a frequency-adjustable power supply circuit comprising:
the power conversion module is used for receiving a control signal containing a state control instruction and PWM pulses, converting an input voltage into an output voltage according to the PWM pulses when the state control instruction instructs the power conversion module to enter a working mode, and stopping converting the input voltage into the output voltage when the state control instruction instructs the power conversion module to enter a sleep mode;
the hysteresis comparison module is used for comparing the sampling voltage of the output voltage with a programmable reference voltage to obtain a corresponding hysteresis comparison signal;
the sleep control module is used for outputting a corresponding wake-up signal when the time length of the power conversion module in the sleep mode is longer than the preset maximum sleep time length; and
and the logic control module is used for generating a state control instruction in the control signal according to the hysteresis comparison signal and the wake-up signal and generating PWM (pulse width modulation) pulses in the control signal according to the input voltage.
Preferably, the power conversion module is a flyback power conversion module.
Preferably, the power conversion module includes:
a primary winding having one end receiving the input voltage;
the input end of the switching tube is connected with the other end of the primary winding, the output end of the switching tube is connected with the first input end of the logic control module, and the control end of the switching tube is connected with the output end of the logic control module;
a secondary winding, one end of which is grounded;
the positive electrode of the diode is connected with the other end of the secondary winding, and the negative electrode of the diode outputs the output voltage;
the positive plate of the output capacitor is connected with the negative end of the diode, and the negative plate of the output capacitor is grounded; and
and an output load connected in parallel with the output capacitor.
Preferably, the power conversion module further comprises:
and the amplifier is connected between the control end of the switching tube and the output end of the logic control module.
Preferably, the hysteresis comparison module includes:
the positive input end of the hysteresis comparator receives the reference voltage, the negative input end of the hysteresis comparator receives the sampling voltage of the output voltage, and the output end of the hysteresis comparator outputs the hysteresis comparison signal;
wherein the reference voltage includes a high voltage threshold and a low voltage threshold.
Preferably, the power supply circuit further includes an output voltage sampling module, the output voltage sampling module including:
one end of the first voltage dividing resistor receives the output voltage, and the other end of the first voltage dividing resistor is connected with the negative input end of the hysteresis comparator so as to output the sampling voltage of the output voltage;
and one end of the second voltage dividing resistor is connected with the other end of the first voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded.
Preferably, the logic control module includes:
the positive input end of the comparator is used as a first input end of the logic control module to receive the sampling voltage of the input voltage, and the negative input end of the comparator is used for receiving a preset reference voltage; and
and the enabling end of the RS trigger is used as a second input end of the logic control module to receive the hysteresis comparison signal and the wake-up signal, the reset end of the RS trigger is connected with the output end of the comparator, the setting end of the RS trigger is connected with the output end of the comparator through an inverting delay processing circuit, and the output end of the RS trigger outputs the control signal to the power conversion module.
Preferably, the enabling end of the RS flip-flop receives the hysteresis comparison signal and the wake-up signal through an or gate.
Preferably, the power supply circuit further includes an input voltage sampling module, the input voltage sampling module including:
and one end of the sampling resistor is connected with the positive input end of the comparator so as to output the sampling voltage of the input voltage to the comparator, and the other end of the sampling resistor is grounded.
In a second aspect, the present invention provides a power supply device, wherein the power supply device comprises a power supply circuit as described above.
By adopting the technical scheme, the invention has the following beneficial effects:
according to the invention, the power conversion module is determined to be in a working mode or a sleep mode according to the comparison signal of the sampling voltage of the output voltage and the programmable reference voltage of the hysteresis comparison module, and the working frequency can be adjusted by periodically switching the working mode and the sleep mode; meanwhile, when the time length of the power conversion module entering the sleep mode is longer than the preset maximum sleep time length, the sleep control module can output a wake-up signal to wake up the power conversion module to enable the power conversion module to be switched back to the working mode, so that the control of the minimum working frequency can be realized, and the application limit of a power circuit to some frequency band sensitive equipment is reduced.
Drawings
FIG. 1 is a circuit diagram of a frequency-tunable power supply circuit of the present invention;
FIG. 2 is a timing diagram illustrating the operation of a frequency-tunable power supply circuit according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
Example 1
The embodiment provides a frequency-adjustable power supply circuit, as shown in fig. 1, which comprises a power conversion module 1, a hysteresis comparison module 2, a sleep control module 3 and a logic control module 4.
In this embodiment, the power conversion module 1 is configured to receive a control signal including a state control command and a PWM pulse, and convert the input voltage VIN into the output voltage Vo according to the PWM pulse when the state control command instructs the power conversion module 1 to enter the Active Mode (Active Mode), and stop converting the input voltage VIN into the output voltage Vo when the state control command instructs the power conversion module 1 to enter the Sleep Mode (Sleep Mode). The hysteresis comparison module 2 is used for comparing the sampling voltage of the output voltage Vo with a programmable reference voltage to obtain a corresponding hysteresis comparison signal. The sleep control module 3 is configured to output a corresponding wake-up signal when a duration of the power conversion module 1 entering the sleep mode is greater than a preset maximum sleep duration. The logic control module 4 is configured to generate a state control command in the control signal according to the hysteresis comparison signal and the wake-up signal, and generate a PWM pulse in the control signal according to the input voltage VIN.
According to the embodiment, according to the comparison signal of the sampling voltage of the output voltage Vo and the programmable reference voltage of the hysteresis comparison module 2, the power conversion module 1 is judged to be in a working mode or a sleep mode, and the working frequency can be adjusted by periodically switching the working mode and the sleep mode; meanwhile, the sleep control module 3 can output a wake-up signal when the time length of the power conversion module 1 entering the sleep mode is longer than the preset maximum sleep time length, so that the power conversion module 1 is waken to be switched back to the working mode, the control of the minimum working frequency can be realized, and the application limit of the power supply circuit in some frequency band sensitive equipment is reduced.
The following describes each module in the power supply circuit of the present embodiment in detail:
in this embodiment, as shown in fig. 1, the power conversion module 1 may be, for example, a flyback power conversion module, which specifically includes: a primary winding having one end (homonymous end) receiving an input voltage V IN The method comprises the steps of carrying out a first treatment on the surface of the The input end of the switching tube S1 is connected with the other end (the synonym end) of the primary winding, the output end of the switching tube S1 is connected with the first input end of the logic control module 4, and the control end of the switching tube S is connected with the output end of the logic control module 4; a secondary winding, one end (the same name end) of which is grounded; the diode D1, its positive pole connects the other end (the synonym end) of the secondary winding, the negative pole end outputs the output voltage Vo; the positive plate of the output capacitor Co is connected with the negative end of the diode D1, and the negative plate of the output capacitor Co is grounded; an output load Ro connected in parallel with the output capacitor Co; and an amplifier DRV connected between the control terminal of the switching tube S1 and the output terminal of the logic control module 4.
In this embodiment, as shown in fig. 1, the hysteresis comparison module 2 includes: the positive input end of the hysteresis comparator U3 receives the reference voltage, the negative input end of the hysteresis comparator U receives the sampling voltage of the output voltage Vo, and the output end of the hysteresis comparator U3 outputs a hysteresis comparison signal; wherein the reference voltage includes a high voltage threshold and a low voltage threshold. In addition, in order to obtain a sampling voltage of the output voltage, the power supply circuit of the embodiment further includes an output voltage sampling module, where the output voltage sampling module specifically includes: the first voltage dividing resistor R1 has one end receiving the output voltage Vo and the other end receiving the negative input end of the loop comparator U3 to output the sampling voltage of the output voltage Vo; and one end of the second voltage dividing resistor R2 is connected with the other end of the first voltage dividing resistor R1, and the other end of the second voltage dividing resistor R2 is grounded.
In this embodiment, the sleep control module 3 starts timing when the power conversion module 1 enters the sleep mode, and outputs a wake-up signal when the time length t_sleep is greater than the preset maximum sleep time length t_sleep_max.
In the present embodiment, as shown in fig. 1, the logic control module 4 includes: a comparator U2 having a positive input terminal (as a first input terminal of the logic control module 4) for receiving an input voltage V IN The negative input end receives a preset reference voltage VREF_CS; and an RS trigger U1, wherein an enable end EN (serving as a second input end of the logic control module 4) receives a hysteresis comparison signal output by the hysteresis comparator U3 and a wake-up signal output by the wake-up module through an OR gate, a reset end R is connected with an output end of the comparator U2, a set end S is connected with an output end of the comparator U2 through a delay circuit, and an output end Q outputs the control signal to the power conversion module 1. In addition, in order to obtain a sampling voltage of the output voltage, the power supply circuit of the present embodiment further includes an input voltage sampling module including: sampling resistor R CS One end of the voltage regulator is connected with the positive input end of the comparator U2 to output an input voltage V IN The other end is grounded.
When the power supply circuit of the present embodiment is in operation, as shown in fig. 1 and 2, the enable end EN of the RS flip-flop is initially at high level (when the power conversion module 1 enters the operation mode), and when the current of the primary winding is in the sampling resistor R CS When the voltage drop (i.e. the sampling voltage of the input voltage) is greater than the reference voltage VREF_CS received by the negative input end of the comparator U2, the comparator U2 outputs a high level, the reset end R is set, the RS trigger U1 outputs a low level, and the switching tube S1 is closed. Then under the action of the delay circuit, a fixed delay time T is passed OFF After that, the setting terminal S sets, the RS trigger U1 outputs high level, and the switching tube S1 is started to enable the power conversion module to input the voltage V IN The conversion to the output voltage Vo ensures that energy is transferred from the input to the output. In this cycle, in the case where the enable terminal EN of the RS flip-flop is at a high level, the output terminal Q of the RS flip-flop outputs the PWM signal as shown in fig. 2 according to the comparison result of the sampling voltage of the input voltage and the reference voltage vref_cs.
The output voltage Vo is divided by the voltage dividing resistors R1 and R2 to obtain a sampling voltage of the output voltage, and the sampling voltage is compared with the reference voltage of the hysteresis comparator U3 to ensure the stability of the output voltage. Specifically, the reference voltage includes a programmable high voltage threshold and a low voltage threshold, when the sampling voltage of the output voltage is higher than the high voltage threshold, the hysteresis comparator U3 outputs a low level, the enable signal of the RS flip-flop U1 is pulled down, the control signal output by U1 is low, at this time, the control signal is used as a state control command to instruct the power conversion module to enter the sleep mode, and the output voltage Vo drops. When the sampling voltage of the output voltage drops to the low voltage threshold, the hysteresis comparator U3 outputs a high level, the enable signal of the RS flip-flop U1 is pulled high, and the control signal output by U1 is high, at this time, the control signal is used as a state control command to instruct the power conversion module to enter the working mode, and the output voltage Vo rises again, as shown in fig. 2.
When the duration t_sleep of the power conversion module in the sleep mode is greater than the preset maximum sleep duration t_sleep_max, the sleep control module 3 outputs a wake-up signal (i.e. the output signal thereof becomes high), the enable end EN of the RS flip-flop U1 is pulled up, at this time, the control signal output by the U1 is used as a state control instruction to instruct the power conversion module to enter the working mode, the output voltage Vo rises, when the sampling voltage of the output voltage is higher than the high voltage threshold of the hysteresis comparator, the enable signal of the U1 is pulled down, and the power conversion module enters the sleep mode again.
By the technical scheme, high-frequency ripple and low-frequency ripple can be observed in the output ripple of the output voltage Vo, and the high-frequency ripple frequency is the switching frequency of the power supply in the working mode; the low frequency ripple frequency is the frequency at which the power supply switches between an operational mode and a sleep mode. The adjustment of the operating frequency can be achieved by periodically switching the operating mode and the sleep mode, and the lowest output ripple frequency can be controlled by the sleep control module 3, so that the application limit on some frequency band sensitive devices is reduced.
In addition, the embodiment can further reduce power consumption by turning off the RS flip-flop when the power conversion module 1 is in the sleep mode, so as to realize higher-efficiency electric energy conversion.
Example 2
The present embodiment provides a power supply device including the frequency-adjustable power supply circuit in embodiment 1.
The power supply device provided in this embodiment includes the above power supply circuit, and the structure of the power supply circuit can refer to the above embodiment and will not be described herein. It should be understood that, since the power supply device of the present embodiment adopts the technical scheme of the power supply circuit, the power supply device has all the beneficial effects of the power supply circuit.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.

Claims (10)

1. A frequency-adjustable power supply circuit, comprising:
the power conversion module is used for receiving a control signal containing a state control instruction and PWM pulses, converting an input voltage into an output voltage according to the PWM pulses when the state control instruction instructs the power conversion module to enter a working mode, and stopping converting the input voltage into the output voltage when the state control instruction instructs the power conversion module to enter a sleep mode;
the hysteresis comparison module is used for comparing the sampling voltage of the output voltage with a programmable reference voltage to obtain a corresponding hysteresis comparison signal;
the sleep control module is used for outputting a corresponding wake-up signal when the time length of the power conversion module in the sleep mode is longer than the preset maximum sleep time length; and
and the logic control module is used for generating a state control instruction in the control signal according to the hysteresis comparison signal and the wake-up signal and generating PWM (pulse width modulation) pulses in the control signal according to the input voltage.
2. The power circuit of claim 1, wherein the power conversion module is a flyback power conversion module.
3. The power circuit of claim 2, wherein the power conversion module comprises:
a primary winding having one end receiving the input voltage;
the input end of the switching tube is connected with the other end of the primary winding, the output end of the switching tube is connected with the first input end of the logic control module, and the control end of the switching tube is connected with the output end of the logic control module;
a secondary winding, one end of which is grounded;
the positive electrode of the diode is connected with the other end of the secondary winding, and the negative electrode of the diode outputs the output voltage;
the positive plate of the output capacitor is connected with the negative end of the diode, and the negative plate of the output capacitor is grounded; and
and an output load connected in parallel with the output capacitor.
4. The power circuit of claim 3, wherein the power conversion module further comprises:
and the amplifier is connected between the control end of the switching tube and the output end of the logic control module.
5. The power supply circuit of claim 1, wherein the hysteresis comparison module comprises:
the positive input end of the hysteresis comparator receives the reference voltage, the negative input end of the hysteresis comparator receives the sampling voltage of the output voltage, and the output end of the hysteresis comparator outputs the hysteresis comparison signal;
wherein the reference voltage includes a high voltage threshold and a low voltage threshold.
6. The power circuit of claim 5, further comprising an output voltage sampling module, the output voltage sampling module comprising:
one end of the first voltage dividing resistor receives the output voltage, and the other end of the first voltage dividing resistor is connected with the negative input end of the hysteresis comparator so as to output the sampling voltage of the output voltage;
and one end of the second voltage dividing resistor is connected with the other end of the first voltage dividing resistor, and the other end of the second voltage dividing resistor is grounded.
7. The power circuit of claim 1, wherein the logic control module comprises:
the positive input end of the comparator is used as a first input end of the logic control module to receive the sampling voltage of the input voltage, and the negative input end of the comparator is used for receiving a preset reference voltage; and
and the enabling end of the RS trigger is used as a second input end of the logic control module to receive the hysteresis comparison signal and the wake-up signal, the reset end of the RS trigger is connected with the output end of the comparator, the setting end of the RS trigger is connected with the output end of the comparator through an inverting delay processing circuit, and the output end of the RS trigger outputs the control signal to the power conversion module.
8. The power circuit of claim 7, wherein an enable terminal of the RS flip-flop receives the hysteresis comparison signal and the wake-up signal through an or gate.
9. The power circuit of claim 7, further comprising an input voltage sampling module, the input voltage sampling module comprising:
and one end of the sampling resistor is connected with the positive input end of the comparator to output the sampling voltage of the input voltage to the comparator, and the other end of the sampling resistor is grounded.
10. A power supply device, characterized in that it comprises a power supply circuit according to any of the preceding claims 1-9.
CN202310530747.7A 2023-05-11 2023-05-11 Power supply circuit with adjustable frequency and power supply device Pending CN116760261A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310530747.7A CN116760261A (en) 2023-05-11 2023-05-11 Power supply circuit with adjustable frequency and power supply device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310530747.7A CN116760261A (en) 2023-05-11 2023-05-11 Power supply circuit with adjustable frequency and power supply device

Publications (1)

Publication Number Publication Date
CN116760261A true CN116760261A (en) 2023-09-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310530747.7A Pending CN116760261A (en) 2023-05-11 2023-05-11 Power supply circuit with adjustable frequency and power supply device

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