CN118214296A - Power switch circuit, control module and small-sized electric equipment - Google Patents

Power switch circuit, control module and small-sized electric equipment Download PDF

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Publication number
CN118214296A
CN118214296A CN202410628843.XA CN202410628843A CN118214296A CN 118214296 A CN118214296 A CN 118214296A CN 202410628843 A CN202410628843 A CN 202410628843A CN 118214296 A CN118214296 A CN 118214296A
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CN
China
Prior art keywords
circuit
transformer
voltage
electrically connected
capacitor
Prior art date
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Pending
Application number
CN202410628843.XA
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Chinese (zh)
Inventor
周勇
邹小安
唐有芳
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Lii Semiconductor Inc
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Lii Semiconductor Inc
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Publication date
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Priority to CN202410628843.XA priority Critical patent/CN118214296A/en
Publication of CN118214296A publication Critical patent/CN118214296A/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
    • 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
    • H02M3/33523—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 galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • 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
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/33569—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 having several active switching elements
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a power switch circuit, a control module and small-sized electric equipment, and relates to the technical field of power control. The power switching circuit is provided with an alternating current input end and a direct current output end, and the power switching circuit comprises: a main control circuit; the driving circuit is used for converting the control signal output by the main control circuit into a driving signal and outputting the driving signal; the voltage detection circuit is used for detecting voltage and outputting a voltage detection signal; the first voltage conversion circuit is used for converting the input first alternating voltage into a first direct voltage and outputting the first direct voltage; the inversion switch circuit is used for switching on or switching off a passage between the alternating current input end and the direct current output end according to the driving signal so as to invert the first direct current voltage into a second alternating current voltage and output the second alternating current voltage; the second voltage conversion circuit is used for converting the input second alternating voltage into a second direct voltage and outputting the second direct voltage to the direct-current output end. The invention aims to improve the control accuracy of a power switch circuit.

Description

Power switch circuit, control module and small-sized electric equipment
Technical Field
The invention relates to the technical field of power control, in particular to a power switch circuit, a control module and small-sized electric equipment.
Background
In the prior art, a voltage detection circuit is generally adopted by a power switch circuit to detect output voltage, and the on-off of the switch circuit is further controlled according to a feedback value, so that the control of power output is realized. However, as the number of electrical appliances and electrical lines increases, how to accurately detect and control the output of a power supply through a voltage detection circuit becomes a design focus of a power supply control circuit. In the existing voltage detection method, a method for detecting voltage by using a transformer exists, the transformer generally improves sampling precision by improving the volume of a magnetic core, the number of turns or the magnetic permeability of materials, but for products with important volumes such as small electric equipment, the used transformer cannot improve the sampling precision by increasing the volume or the number of turns due to the limitation of the volume, and the existing technology has the problem that the power supply control is inaccurate due to poor detection precision under the condition of volume limitation.
Disclosure of Invention
The invention mainly aims to provide a power switch circuit, which aims to improve the control accuracy of the power switch circuit.
In order to achieve the above object, the present invention provides a power switching circuit applied to small-sized electric equipment, the power switching circuit is provided with an ac input end and a dc output end, the power switching circuit includes:
A main control circuit;
The driving circuit is electrically connected with the main control circuit and is used for converting a control signal output by the main control circuit into a driving signal and outputting the driving signal;
The input end of the voltage detection circuit is electrically connected with the second voltage conversion circuit, the output end of the voltage detection circuit is electrically connected with the main control circuit, and the voltage detection circuit is used for voltage detection and outputting a voltage detection signal;
the input end of the first voltage conversion circuit is electrically connected with the alternating current input end, and the first voltage conversion circuit is used for converting a first alternating current voltage input by the alternating current input end into a first direct current voltage and outputting the first direct current voltage;
The input end of the inversion switch circuit is electrically connected with the output end of the first voltage conversion circuit, and the controlled end of the inversion switch circuit is electrically connected with the output end of the driving circuit; the inversion switch circuit is used for switching on or switching off a passage between the alternating current input end and the direct current output end according to the driving signal so as to invert the first direct current voltage into a second alternating current voltage and output the second alternating current voltage;
The input end of the second voltage conversion circuit is electrically connected with the output end of the inversion switch circuit, and the second voltage conversion circuit is used for converting the input second alternating voltage into second direct voltage and outputting the second direct voltage to the direct current output end.
In one embodiment, the driving circuit includes a driving transformer, a first resistor, and a first capacitor; the driving transformer comprises a primary coil, a first secondary coil and a second secondary coil;
The first end of the first resistor is electrically connected with the first end of the first capacitor and the main control circuit, and the second end of the first resistor is electrically connected with the second end of the first capacitor and the second end of the primary coil; the first end of the primary coil is electrically connected with the main control circuit; the first secondary coil and the second secondary coil are respectively and electrically connected with the inversion switch circuit.
In one embodiment, the voltage detection circuit includes:
The transformer comprises an iron core, a transformer primary coil, a transformer first secondary coil and a transformer second secondary coil, the transformer first secondary coil and the transformer second secondary coil are respectively arranged in a coupling way with the transformer primary coil, and the transformer primary coil is connected with the second voltage detection circuit;
The input end of the amplifying circuit is connected with the output end of the first secondary side coil of the transformer, the output end of the amplifying circuit is connected with the first end of the second secondary side coil of the transformer, and the amplifying circuit is used for carrying out differential amplification on the voltages output by the two output ends of the first secondary side coil of the transformer and outputting the amplified voltages to the second secondary side coil of the transformer;
The detection end of the output detection circuit is connected with the second end of the second secondary coil of the transformer; the output detection circuit is used for obtaining the current of the second secondary coil of the transformer and outputting a corresponding voltage detection signal.
In an embodiment, the voltage detection circuit further comprises: the circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and an operational amplifier;
The second resistors are arranged at two ends of the first secondary coil in parallel; the first end of the third resistor is a detection end of the output detection circuit, and the second end of the third resistor is grounded; the first end of the second capacitor is a first input end of the amplifying circuit, the first end of the third capacitor is a second input end of the amplifying circuit, and the second end of the second capacitor is connected with the third end of the operational amplifier and the first end of the fifth resistor; the first end of the fourth resistor is connected with the second end of the third capacitor and the first end of the operational amplifier, the second end of the fourth resistor is grounded, the first end of the operational amplifier is the non-inverting input end of the operational amplifier, and the third end of the operational amplifier is the inverting input end of the operational amplifier; the first end of the fourth capacitor is connected with the second end of the operational amplifier and the negative power supply, and the second end of the fourth capacitor is grounded; the first end of the fifth capacitor is connected with the fifth end of the operational amplifier and the positive power supply, and the second end of the fifth capacitor is grounded; the second end of the fifth resistor is connected with the fourth end of the operational amplifier, and the fourth end of the operational amplifier is the output end of the amplifying circuit.
In an embodiment, the first voltage conversion circuit includes a first diode, a second diode, a third diode, a fourth diode, a sixth capacitor, a seventh capacitor, and an eighth capacitor;
The anode of the first diode is electrically connected with the first end of the alternating current input end, and the cathode of the first diode is electrically connected with the first end of the sixth capacitor, the first end of the seventh capacitor and the cathode of the second diode; the anode of the second diode is electrically connected with the second end of the alternating current input end and the cathode of the third diode; the anode of the third diode is electrically connected with the second end of the sixth capacitor, the second end of the eighth capacitor and the anode of the fourth diode; the cathode of the fourth diode is electrically connected with the anode of the first diode; the second end of the seventh capacitor is electrically connected with the first end of the eighth capacitor.
In an embodiment, the switching circuit comprises a sixth resistor, a seventh resistor, a first switching tube and a second switching tube;
The first end of the sixth resistor is electrically connected with the second end of the first secondary coil, and the second end of the sixth resistor is electrically connected with the controlled end of the first switch tube; the first end of the seventh resistor is electrically connected with the second end of the second secondary coil, and the second end of the seventh resistor is electrically connected with the controlled end of the second switching tube; the first end of the first switch tube is electrically connected with the first end of the first secondary coil, and the second end of the first switch tube is electrically connected with the first end of the second secondary coil and the second voltage conversion circuit; the first end of the second switching tube is electrically connected with the second end of the first switching tube, and the second end of the second switching tube is electrically connected with the first end of the third capacitor.
In an embodiment, the second voltage conversion circuit includes a transformer, a fifth diode, and a sixth diode; the transformer comprises a primary side coil of the transformer and a secondary side coil of the transformer;
The first end of the primary coil of the transformer is electrically connected with the second end of the seventh capacitor and the first end of the eighth capacitor, and the second end of the primary coil of the transformer is electrically connected with the second end of the first switch tube; the anode of the fifth diode and the anode of the sixth diode are electrically connected with the first end of the secondary coil of the transformer, and the cathode of the fifth diode and the cathode of the sixth diode are electrically connected with the anode of the direct current output end.
The invention also provides a control module which comprises the power switch circuit.
The invention also provides small-sized electric equipment, which comprises the power switch circuit or the control module.
According to the technical scheme, the power switch circuit is adopted, so that the control accuracy of the power switch circuit is effectively improved. According to the technical scheme, the voltage detection circuit is used for detecting the voltage of the output current and feeding back a current signal to the main control circuit, so that the main control circuit outputs a control signal to the driving circuit. The driving circuit outputs a corresponding driving signal to the inversion switch circuit after receiving the control signal. The first voltage conversion circuit rectifies a first alternating current voltage input by the alternating current input end into a first direct current voltage and outputs the first direct current voltage to the inversion switch circuit, the inversion switch circuit controlled by the main control circuit according to the voltage detection signal inverts and outputs the first direct current voltage into a second alternating current, and the second direct current voltage is rectified and output by the second voltage conversion circuit. The power switch circuit obtains an accurate voltage detection signal through the voltage detection circuit and controls the output voltage according to the voltage detection signal, so that the accuracy of the output voltage control is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of an embodiment of a power switching circuit according to the present invention;
FIG. 2 is a schematic block diagram of another embodiment of a power switching circuit according to the present invention;
fig. 3 is a schematic diagram of a power switch circuit according to the present invention.
Reference numerals illustrate:
10. A main control circuit; 20. a driving circuit; 30. a voltage detection circuit; 31. a transformer; 32. an amplifying circuit; 33. an output detection circuit; 40. a first voltage conversion circuit; 50. an inverter switching circuit; 60. a second voltage conversion circuit; R1-R7, a first resistor and a seventh resistor; C1-C8, first capacitor-eighth capacitor; d1-D6, first diode-sixth diode; Q1-Q2, a first switching tube and a second switching tube.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments 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.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
In order to improve the control accuracy of a power switch circuit, the application provides the power switch circuit which is applied to small-sized electric equipment, wherein the power switch circuit is provided with an alternating current input end and a direct current output end, and the power switch circuit comprises:
A main control circuit 10;
a driving circuit 20, wherein the driving circuit 20 is electrically connected with the main control circuit 10, and the driving circuit 20 is used for converting a control signal output by the main control circuit 10 into a driving signal and outputting the driving signal;
The input end of the voltage detection circuit 30 is electrically connected with the second voltage conversion circuit 60, the output end of the voltage detection circuit 30 is electrically connected with the main control circuit 10, and the voltage detection circuit 30 is used for voltage detection and outputting a voltage detection signal;
The first voltage conversion circuit 40, the input end of the first voltage conversion circuit 40 is electrically connected with the ac input end, and the first voltage conversion circuit 40 is configured to convert a first ac voltage input by the dc input end into a first dc voltage and output the first dc voltage;
an inverter switching circuit 50, wherein an input end of the inverter switching circuit 50 is electrically connected with an input end of the first voltage conversion circuit 40, and a controlled end of the inverter switching circuit 50 is electrically connected with an output end of the driving circuit 20; the inverter switch circuit 50 is configured to switch on or off a path between the ac input terminal and the dc output terminal according to the driving signal, so as to invert the first dc voltage into a second ac voltage and output the second ac voltage;
The input end of the second voltage conversion circuit 60 is electrically connected to the output end of the inverter switch circuit 50, and the second voltage conversion circuit 60 is configured to convert the input second ac voltage into a second dc voltage and output the second dc voltage to the dc output end.
In this embodiment, the master control circuit 10 may be implemented by a master controller, for example, a PLC (Programmable Logic Controller ), an MCU (Microcontroller Unit, micro control unit), a DSP (DIGITAL SIGNAL Process, digital signal processing Chip), an FPGA (Field Programmable GATE ARRAY, programmable gate array Chip), an SOC (System On Chip), or the like. The main control circuit 10 outputs a corresponding control signal to the driving circuit 20 by acquiring the voltage detection signal input by the voltage detection circuit 30, so that the driving circuit 20 outputs a driving signal to the inverter switch circuit 50, and the inverter switch circuit 50 performs a corresponding action. Specifically, the main control circuit 10 determines the current output voltage state by acquiring the voltage detection signal input from the voltage detection circuit 30, and outputs a corresponding PWM control signal to the driving circuit 20, and outputs the PWM control signal to the inverter switching circuit 50 through the driving circuit 20, thereby controlling the turn-off of the inverter switching circuit 50. The control circuit controls the off frequency of the switching circuit by changing the duty ratio of the PWM control signal, thereby controlling the output voltage.
In this embodiment, the driving circuit 20 includes a driving transformer, a first resistor R1, and a first capacitor C1; the driving transformer comprises a primary coil, a first secondary coil and a second secondary coil;
The first end of the first resistor R1 is electrically connected with the first end of the first capacitor C1 and the main control circuit 10, and the second end of the first resistor R1 is electrically connected with the second end of the first capacitor C1 and the second end of the primary coil; the first end of the primary coil is electrically connected with the main control circuit 10; the first secondary winding and the second secondary winding are electrically connected to the inverter switching circuit 50, respectively. Specifically, the main control circuit 10 outputs a PWM control signal, filters the PWM control signal through the first resistor R1 and the first capacitor C1, and converts the PWM control signal into two sets of driving signals through the driving transformer, and outputs the two sets of driving signals to the inverter switching circuit 50 through the first secondary winding and the second secondary winding, respectively, so that the switching devices in the inverter switching circuit 50 perform corresponding actions when receiving the driving signals.
In the present embodiment, the voltage detection circuit 30 may be implemented using a resistor voltage division detection circuit, a linear operational amplifier voltage detection circuit, a voltage detection transformer, or the like. In the present embodiment, a voltage detection transformer is employed for the voltage detection circuit 30. The voltage detection circuit 30 includes:
The transformer 31, the transformer 31 includes an iron core, a transformer primary coil, a transformer first secondary coil and a transformer second secondary coil, the transformer first secondary coil and the transformer second secondary coil are respectively coupled with the transformer primary coil, and the transformer primary coil is connected with the second voltage detection circuit;
The input end of the amplifying circuit 32 is connected with the output end of the first secondary side coil of the transformer, the output end of the amplifying circuit 32 is connected with the first end of the second secondary side coil of the transformer, and the amplifying circuit 32 is used for differentially amplifying the voltages output by the two output ends of the first secondary side coil of the transformer and outputting the amplified voltages to the second secondary side coil of the transformer;
The detection end of the output detection circuit 33 is connected with the second end of the second secondary coil of the transformer; the output detection circuit 33 is configured to obtain a current of the second secondary winding of the transformer, and output a corresponding voltage detection signal.
Further, the voltage detection circuit 30 further includes: the circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5 and an operational amplifier;
The second resistor R2 is arranged at two ends of the first secondary side coil of the transformer in parallel; the first end of the third resistor R3 is a detection end of the output detection circuit 33, and the second end of the third resistor R3 is grounded; the first end of the second capacitor C2 is the first input end of the amplifying circuit 32, the first end of the third capacitor C3 is the second input end of the amplifying circuit 32, and the second end of the second capacitor C2 is connected with the third end of the operational amplifier and the first end of the fifth resistor R5; the first end of the fourth resistor R4 is connected with the second end of the third capacitor C3 and the first end of the operational amplifier, the second end of the fourth resistor R4 is grounded, the first end of the operational amplifier is the non-inverting input end of the operational amplifier, and the third end of the operational amplifier is the inverting input end of the operational amplifier; the first end of the fourth capacitor C4 is connected with the second end of the operational amplifier and the negative power supply, and the second end of the fourth capacitor C4 is grounded; a first end of the fifth capacitor C5 is connected with a fifth end of the operational amplifier and a positive power supply, and a second end of the fifth capacitor C5 is grounded; the second end of the fifth resistor R5 is connected to the fourth end of the operational amplifier, and the fourth end of the operational amplifier is the output end of the amplifying circuit 32.
Specifically, in this embodiment, the transformer 31 includes an iron core, where a primary coil of the transformer, a first secondary coil of the transformer, and a second secondary coil of the transformer are wound around the iron core, and the iron core may be made of silicon steel or other materials with high magnetic permeability, such as nanocrystalline, permalloy, amorphous alloy, and the like. When the transformer 31 is operated, an alternating current flows through the primary winding of the transformer to generate a varying magnetic flux, which induces an induced electromotive force in the winding, and when the primary winding of the transformer passes a small current, for example, a current having a magnitude of 1 to 10mA, the amount of variation in the generated magnetic flux is approximately equal to the magnitude of the magnetic flux. The magnetic flux is conducted in the iron core, the changing magnetic flux enables the two ends of the first secondary side coil and the second secondary side coil of the mutual inductor to generate induced electromotive force, the induced electromotive force on the first secondary side coil is related to the magnetic flux in the iron core, the smaller the magnetic flux in the iron core is, the smaller the induced electromotive force on the coil is, but the two are not subjected to linear relation.
Further, the transformer 31 includes an iron core, the primary winding N1 of the transformer, the first secondary winding N2 of the transformer, and the second secondary winding N3 of the transformer are respectively wound on the iron core, and the iron core may be made of silicon steel or other materials with high magnetic permeability, such as nanocrystalline, permalloy, amorphous alloy, etc. In operation of the transformer 31, an alternating current flows through the primary coil to produce a varying magnetic flux which induces an induced electromotive force in the coil, and when the primary coil N1 passes a small current, for example, a current having a magnitude of 1 to 10mA, the amount of change in the produced magnetic flux is approximately equal to the magnitude of the magnetic flux. The magnetic flux is conducted in the iron core, the changing magnetic flux enables the two ends of the first secondary coil N2 and the second secondary coil N3 to generate induced electromotive force, the induced electromotive force on the first secondary coil N2 is related to the magnitude of the magnetic flux in the iron core, and the smaller the magnetic flux in the iron core is, the smaller the induced electromotive force on the coils is, but the two are not in a linear relation.
When the transformer 31 works, an electromagnetic loop is generated inside the transformer 31, and the magnetic potential balance equation of the electromagnetic loop inside the transformer 31 is as follows, without considering magnetic leakage:
In the method, in the process of the invention, For the primary side current,/>For the number of turns of the primary winding N1,/>For the first secondary winding N2 current,/>For the number of turns of the first secondary winding N2,/>For the second secondary winding N3 current,/>For the number of turns of the second secondary winding N3,/>For the excitation current.
Notably, the excitation ampere-turnsFor the primary side ampere turn/>N2 ampere-turns of the first secondary windingAnd a second secondary winding N3 ampere-turns/>Vector sum of (d).
Due to the existence of the magnetic resistance of the iron core, a small part of current must be consumed by the transformer 31 for excitation in the process of transferring the current, so that the iron core is magnetized, and induced electromotive force and current are generated in the secondary coil, and the exciting current consumed by the iron core can cause measurement errors of the transformer 31; because of the exciting ampere-turnsIf there is an error in the measurement, if the excitation ampere-turns are madeAnd the transformer is in a zero magnetic flux state in the iron core, and the first secondary winding N2 ampere-turn of the transformer and the second secondary winding N3 ampere-turn of the transformer can completely reflect the change of the primary winding N1 ampere-turn of the transformer. However, the induced electromotive force induced in the secondary coil requires magnetic flux in the core, so the core cannot be in a zero-flux state, but can only be in a dynamic zero-flux state.
In this embodiment, the induced electromotive force is induced from the magnetic flux in the iron core through the first secondary coil N2 of the transformer, the voltage signal obtained by the first secondary coil N2 is output to the amplifying circuit 32, the amplifying circuit 32 amplifies the induced electromotive force of the first secondary coil N2 of the transformer and then outputs the amplified voltage at the output end of the amplifying circuit 32, and the amplified voltage is output to the second secondary coil N3 of the transformer to provide current for the second secondary coil N3 of the transformer, so that the magnetic flux opposite to the iron core direction is generated at the second secondary coil N3 of the transformer to offset the magnetic flux in the iron core.
Specifically, when the amplifying circuit 32 supplies a current to the transformer second secondary winding N3, the current counteracts the magnetic flux in the iron core through the magnetic flux generated by the transformer second secondary winding N3, the magnetic flux in the iron core decreases to reduce the induced electromotive force at the transformer first secondary winding N2, but because the amplifying factor of the amplifying circuit 32 is large enough, the output end of the amplifying circuit 32 can still output a current to drive the transformer second secondary winding N3 to counteract the magnetic flux in the iron core, when the second secondary winding N3 makes the magnetic flux in the iron core zero, the induced electromotive force in the transformer first secondary winding N2 is zero, so that the current output by the amplifying circuit 32 is zero, the capability of counteracting the magnetic flux in the iron core in the transformer second secondary winding N3 is lost, and the magnetic flux in the iron core is not zero, so that the inductive electromotive force in the transformer first secondary winding N2 can be counteracted, and the magnetic flux in the iron core N3 can be restored; the process is repeated in a circulating way until a balance point is obtained, at which the magnetic flux in the iron core is close to zero, the induced electromotive force of the first secondary coil N2 of the transformer is close to zero, and the amplifying circuit 32 still outputs current to the second secondary coil N3 of the transformer due to large amplification factor; the primary coil N1 of the transformer, the first secondary coil N2 of the transformer and the second secondary coil N3 form a magnetic linkage loopIn (3), the excitation ampere-turns/>, due to the near zero magnetic flux in the coreNear zero, the induced electromotive force on the first secondary coil N2 of the transformer is near zero, so that the induced current on the first secondary coil N2 of the transformer is near zero, and the first secondary coil N2 ampere-turns/>, of the transformerIs also close to zero, thus obtaining the flux linkage loop/>, of the iron core in the zero magnetic flux state=－/>From this equation, when the iron core is in the zero magnetic flux state, the current in the second secondary winding N3 of the transformer is proportional to the current in the primary winding N1 of the transformer.
Mutual inductor second secondary coil N3 carries out mutual inductance with mutual inductor primary coil N1 to mutual inductor primary coil N1 electric current and mutual inductor second secondary coil N3 electric current exist proportional relation, and the detection end of alternating current voltage detection circuit 30 is connected with mutual inductor second secondary coil N3, through the electric current that the sampling is flowed through on the mutual inductor second secondary coil N3, under the certain circumstances of impedance, according to the relation between electric current and the voltage, alternating current voltage detection circuit 30 can realize the voltage sampling to mutual inductor primary coil N1.
The voltage detection circuit 30 amplifies the induced electromotive force on the first secondary winding N2 of the transformer by adopting the amplifying circuit 32 and outputs the amplified induced electromotive force to the second secondary winding N3 of the transformer so as to provide compensation current for the second secondary winding N3 of the transformer, and then magnetic flux with opposite magnetic flux direction in the iron core is generated in the second secondary winding N3 of the transformer, so that the magnetic flux in the iron core is counteracted, a dynamic zero magnetic flux state can be realized in the iron core, and thus, when the output detection circuit 33 collects current flowing through the second secondary winding N3 of the transformer, the error influence of exciting current can be reduced and the detection precision of the voltage of the primary winding N1 of the transformer is improved.
In the present embodiment, the first voltage converting circuit 40 is a bridge rectifier circuit. Specifically, the first voltage conversion circuit 40 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8; the anode of the first diode D1 is electrically connected to the first end of the ac input terminal, and the cathode is electrically connected to the first end of the sixth capacitor C6, the first end of the seventh capacitor C7, and the cathode of the second diode D2; the anode of the second diode D2 is electrically connected with the second end of the alternating current input end and the cathode of the third diode D3; the anode of the third diode D3 is electrically connected to the second end of the sixth capacitor C6, the second end of the eighth capacitor C8, and the anode of the fourth diode D4; the cathode of the fourth diode D4 is electrically connected with the anode of the first diode D1; the second end of the seventh capacitor C7 is electrically connected to the first end of the eighth capacitor C8. In addition, the first voltage conversion circuit 40 may also be implemented using a full-wave rectification circuit, a half-wave rectification circuit, or the like. The power input terminal is connected to a 220V ac voltage (i.e., a first ac voltage) of the mains supply, and is rectified by the bridge rectifier circuit and then output to the filter circuit, and the filter circuit filters the rectified ac voltage and then outputs a dc voltage (i.e., a first dc voltage) of about 310V to the inverter switch circuit 50.
In this embodiment, the inverter switching circuit 50 may be implemented by using a plurality of groups of switching transistors, such as MOS transistors, IGBT transistors, thyristors, transistors, power transistors, and the like. Specifically, the switching circuit comprises a sixth resistor R6, a seventh resistor R7, a first switching tube Q1 and a second switching tube Q2; the first end of the sixth resistor R6 is electrically connected with the second end of the first secondary coil, and the second end of the sixth resistor R6 is electrically connected with the controlled end of the first switching tube Q1; the first end of the seventh resistor R7 is electrically connected with the second end of the second secondary winding, and the second end of the seventh resistor R7 is electrically connected with the controlled end of the second switching tube Q2; the first end of the first switching tube Q1 is electrically connected to the first end of the first secondary winding, and the second end is electrically connected to the first end of the second secondary winding and the second voltage conversion circuit 60; the first end of the second switching tube Q2 is electrically connected to the second end of the first switching tube Q1, and the second end is electrically connected to the first end of the third capacitor C3. The controlled end of the first switching tube Q1 and the controlled end of the second switching tube Q2 are respectively connected with a first secondary coil and a second secondary coil of the driving transformer, so as to obtain driving signals. The main control circuit 10 controls the duty ratio of the output PWM signal to control the driving circuit 20 to output a corresponding driving signal, thereby controlling the switching frequency of the first switching transistor Q1 and the second switching transistor Q2, and controlling the switching states of the first switching transistor Q1 and the second switching transistor Q2 through the first secondary winding and the second secondary winding. Thereby realizing the inverter switching circuit 50 to invert the input first alternating voltage to the second alternating voltage and output. For example, the input 310V dc voltage is inverted to an ac square wave voltage of about 155V and output.
In the present embodiment, the second voltage conversion circuit 60 is a half-wave rectification circuit. Specifically, the second voltage conversion circuit 60 includes a transformer, a fifth diode D5, and a sixth diode D6; the transformer comprises a primary side coil of the transformer and a secondary side coil of the transformer; the first end of the primary coil of the transformer is electrically connected with the second end of the seventh capacitor C7 and the first end of the eighth capacitor C8, and the second end of the primary coil of the transformer is electrically connected with the second end of the first switching tube Q1; the anode of the fifth diode D5 and the anode of the sixth diode D6 are electrically connected with the first end of the secondary winding of the transformer, and the cathode of the fifth diode and the cathode of the sixth diode D6 are electrically connected with the positive electrode of the dc output terminal. The second voltage conversion circuit 60 transforms the input ac voltage to a preset voltage through a transformer, and then outputs half-wave rectification through the fifth diode D5 and the sixth diode D6. It should be appreciated that the second ac voltage input to the primary winding of the transformer may be output controlled by the main control circuit 10 through the inverter switching circuit 50. The main control circuit 10 outputs a PWM control signal with a corresponding duty ratio to the driving circuit 20 according to the voltage detection circuit 30 to output an accurate voltage detection signal, thereby effectively controlling the output voltage.
The voltage detection circuit 30 performs voltage detection on the output current and feeds back a current signal to the main control circuit 10, so that the main control circuit 10 outputs a control signal to the driving circuit 20. The driving circuit 20 outputs a corresponding driving signal to the inverter switching circuit 50 after receiving the control signal. The first voltage conversion circuit 40 rectifies a first ac voltage input from an ac input terminal into a first dc voltage and outputs the first dc voltage to the inverter switching circuit 50, the inverter switching circuit 50 controlled by the main control circuit 10 according to the voltage detection signal inverts and outputs the first ac voltage into a second ac voltage, and the second ac voltage is rectified and output by the second voltage conversion circuit 60. The power switch circuit obtains an accurate voltage detection signal through the voltage detection circuit 30 and controls the output voltage according to the voltage detection signal, thereby improving the accuracy of the output voltage control.
The application also provides a control module which comprises the power switch circuit. It should be noted that, because the control module of the present application is based on the above-mentioned power switch circuit, the embodiments of the control module of the present application include all the technical schemes of all the embodiments of the above-mentioned power switch circuit, and the achieved technical effects are identical, and are not described herein again.
The application also provides small-sized electric equipment, which comprises the power switch circuit or the control module. It is noted that, because the small-sized electric equipment is based on the power switch circuit or the control module, the embodiments of the small-sized electric equipment include all the technical schemes of all the embodiments of the power switch circuit, and the achieved technical effects are identical, and are not described in detail herein.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims (9)

1. The utility model provides a power switch circuit, is applied to small-size consumer, its characterized in that, power switch circuit is equipped with alternating current input and direct current output, power switch circuit includes main control circuit, drive circuit, voltage detection circuit, first voltage conversion circuit, contravariant switch circuit, second voltage conversion circuit:
The driving circuit is electrically connected with the main control circuit and is used for converting a control signal output by the main control circuit into a driving signal and outputting the driving signal;
the input end of the voltage detection circuit is electrically connected with the second voltage conversion circuit, the output end of the voltage detection circuit is electrically connected with the main control circuit, and the voltage detection circuit is used for voltage detection and outputting a voltage detection signal;
the input end of the first voltage conversion circuit is electrically connected with the alternating current input end, and the first voltage conversion circuit is used for converting a first alternating current voltage input by the alternating current input end into a first direct current voltage and outputting the first direct current voltage;
The input end of the inversion switch circuit is electrically connected with the output end of the first voltage conversion circuit, and the controlled end of the inversion switch circuit is electrically connected with the output end of the driving circuit; the inversion switch circuit is used for switching on or switching off a passage between the alternating current input end and the direct current output end according to the driving signal so as to invert the first direct current voltage into a second alternating current voltage and output the second alternating current voltage;
the input end of the second voltage conversion circuit is electrically connected with the output end of the inversion switch circuit, and the second voltage conversion circuit is used for converting the input second alternating voltage into a second direct voltage and outputting the second direct voltage to the direct current output end.
2. The power switching circuit according to claim 1, wherein the driving circuit comprises a driving transformer, a first resistor, a first capacitor; the driving transformer comprises a primary coil, a first secondary coil and a second secondary coil;
The first end of the first resistor is electrically connected with the first end of the first capacitor and the main control circuit, and the second end of the first resistor is electrically connected with the second end of the first capacitor and the second end of the primary coil; the first end of the primary coil is electrically connected with the main control circuit; the first secondary coil and the second secondary coil are respectively and electrically connected with the inversion switch circuit.
3. The power switching circuit according to claim 2, wherein the voltage detection circuit includes:
The transformer comprises an iron core, a transformer primary coil, a transformer first secondary coil and a transformer second secondary coil, the transformer first secondary coil and the transformer second secondary coil are respectively arranged in a coupling way with the transformer primary coil, and the transformer primary coil is connected with the second voltage detection circuit;
The input end of the amplifying circuit is connected with the output end of the first secondary side coil of the transformer, the output end of the amplifying circuit is connected with the first end of the second secondary side coil of the transformer, and the amplifying circuit is used for carrying out differential amplification on the voltages output by the two output ends of the first secondary side coil of the transformer and outputting the amplified voltages to the second secondary side coil of the transformer;
The detection end of the output detection circuit is connected with the second end of the second secondary coil of the transformer; the output detection circuit is used for obtaining the current of the second secondary coil of the transformer and outputting a corresponding voltage detection signal.
4. The power switching circuit according to claim 3, wherein the voltage detection circuit further comprises: the circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and an operational amplifier;
The second resistors are arranged at two ends of the first secondary side coil of the transformer in parallel; the first end of the third resistor is a detection end of the output detection circuit, and the second end of the third resistor is grounded; the first end of the second capacitor is a first input end of the amplifying circuit, the first end of the third capacitor is a second input end of the amplifying circuit, and the second end of the second capacitor is connected with the third end of the operational amplifier and the first end of the fifth resistor; the first end of the fourth resistor is connected with the second end of the third capacitor and the first end of the operational amplifier, the second end of the fourth resistor is grounded, the first end of the operational amplifier is the non-inverting input end of the operational amplifier, and the third end of the operational amplifier is the inverting input end of the operational amplifier; the first end of the fourth capacitor is connected with the second end of the operational amplifier and the negative power supply, and the second end of the fourth capacitor is grounded; the first end of the fifth capacitor is connected with the fifth end of the operational amplifier and the positive power supply, and the second end of the fifth capacitor is grounded; the second end of the fifth resistor is connected with the fourth end of the operational amplifier, and the fourth end of the operational amplifier is the output end of the amplifying circuit.
5. The power switching circuit according to claim 4, wherein the first voltage conversion circuit includes a first diode, a second diode, a third diode, a fourth diode, a sixth capacitor, a seventh capacitor, and an eighth capacitor;
The anode of the first diode is electrically connected with the first end of the alternating current input end, and the cathode of the first diode is electrically connected with the first end of the sixth capacitor, the first end of the seventh capacitor and the cathode of the second diode; the anode of the second diode is electrically connected with the second end of the alternating current input end and the cathode of the third diode; the anode of the third diode is electrically connected with the second end of the sixth capacitor, the second end of the eighth capacitor and the anode of the fourth diode; the cathode of the fourth diode is electrically connected with the anode of the first diode; the second end of the seventh capacitor is electrically connected with the first end of the eighth capacitor.
6. The power switching circuit according to claim 5, wherein the switching circuit comprises a sixth resistor, a seventh resistor, a first switching tube, a second switching tube;
The first end of the sixth resistor is electrically connected with the second end of the first secondary coil, and the second end of the sixth resistor is electrically connected with the controlled end of the first switch tube; the first end of the seventh resistor is electrically connected with the second end of the second secondary coil, and the second end of the seventh resistor is electrically connected with the controlled end of the second switching tube; the first end of the first switch tube is electrically connected with the first end of the first secondary coil, and the second end of the first switch tube is electrically connected with the first end of the second secondary coil and the second voltage conversion circuit; the first end of the second switching tube is electrically connected with the second end of the first switching tube, and the second end of the second switching tube is electrically connected with the first end of the third capacitor.
7. The power switching circuit according to claim 6, wherein the second voltage conversion circuit includes a transformer, a fifth diode, a sixth diode; the transformer comprises a primary side coil of the transformer and a secondary side coil of the transformer;
The first end of the primary coil of the transformer is electrically connected with the second end of the seventh capacitor and the first end of the eighth capacitor, and the second end of the primary coil of the transformer is electrically connected with the second end of the first switch tube; the anode of the fifth diode and the anode of the sixth diode are electrically connected with the first end of the secondary coil of the transformer, and the cathode of the fifth diode and the cathode of the sixth diode are electrically connected with the anode of the direct current output end.
8. A control module comprising a power switching circuit according to any one of claims 1 to 7.
9. A small-sized electric device, characterized in that it comprises a power switching circuit according to any one of claims 1 to 7 or a control module according to claim 8.
CN202410628843.XA 2024-05-21 2024-05-21 Power switch circuit, control module and small-sized electric equipment Pending CN118214296A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410628843.XA CN118214296A (en) 2024-05-21 2024-05-21 Power switch circuit, control module and small-sized electric equipment

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Application Number Priority Date Filing Date Title
CN202410628843.XA CN118214296A (en) 2024-05-21 2024-05-21 Power switch circuit, control module and small-sized electric equipment

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104836449A (en) * 2014-12-13 2015-08-12 襄阳精圣科技信息咨询有限公司 Novel push-pull converter
US20180076715A1 (en) * 2016-09-15 2018-03-15 Peregrine Semiconductor Corporation Current Protected Integrated Transformer Driver for Isolating a DC-DC Convertor
CN110605460A (en) * 2019-09-29 2019-12-24 南京凌鸥创芯电子有限公司 Power conversion circuit of high-frequency inverter welding machine
CN220040586U (en) * 2023-06-20 2023-11-17 深圳曼顿科技有限公司 Alternating voltage sampling circuit and circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104836449A (en) * 2014-12-13 2015-08-12 襄阳精圣科技信息咨询有限公司 Novel push-pull converter
US20180076715A1 (en) * 2016-09-15 2018-03-15 Peregrine Semiconductor Corporation Current Protected Integrated Transformer Driver for Isolating a DC-DC Convertor
CN110605460A (en) * 2019-09-29 2019-12-24 南京凌鸥创芯电子有限公司 Power conversion circuit of high-frequency inverter welding machine
CN220040586U (en) * 2023-06-20 2023-11-17 深圳曼顿科技有限公司 Alternating voltage sampling circuit and circuit breaker

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