CN-122001208-A - Input disturbance optimization circuit, control method and switching power supply

CN122001208ACN 122001208 ACN122001208 ACN 122001208ACN-122001208-A

Abstract

The invention discloses an input disturbance optimization circuit, a control method and a switching power supply, wherein the circuit comprises an open-loop control unit and a switching unit, the output end of the open-loop control unit is connected to the control end of the switching unit, the input end of the open-loop control unit is connected to the input end of a power supply or the input voltage of an external power supply, and the open-loop control unit is used for responding to a control signal received from the input end of the power supply or the external power supply, stabilizing the control signal and controlling the switching unit to be turned on or off in an open-loop mode through the stabilized control signal so that the input disturbance optimization circuit outputs stable voltage. The invention is an open loop control system, can realize open loop control, and has rapid response to real-time adjustment of output. The open loop control unit outputs stable voltage to the control end of the switch unit for control, and the output voltage can realize stable filtering effect when the voltage of the control end of the switch unit needs to be stable enough, has no fluctuation and has no noise interference.

Inventors

YIN XIANGYANG
SHEN ZHIPENG
XIA WEISHENG
HUANG GUOHE
WENG BIN

Assignees

广州金升阳科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260107
Priority Date: 20250516

Claims (15)

1. The input disturbance optimization circuit is characterized by comprising an open loop control unit and a switch unit, wherein the output end of the open loop control unit is connected to the control end of the switch unit, and the input end of the open loop control unit is connected to the input end of a power supply or the input voltage of an external power supply; The open loop control unit is used for responding to the control signal received from the power input end or an external power supply, stabilizing the control signal and controlling the on or off of the switch unit in an open loop mode through the stabilized control signal, so that the input disturbance optimizing circuit outputs stable voltage.
2. The input disturbance optimizing circuit according to claim 1, wherein the open loop control unit comprises a voltage regulator or a DC source.
3. The input disturbance optimizing circuit according to claim 1, wherein the open loop control unit comprises a first regulator tube, and a cathode of the first regulator tube is connected to a control terminal of the switching unit.
4. The input disturbance optimizing circuit according to claim 1, wherein the open loop control unit comprises a first voltage regulator tube, a first reference source, a first resistor and a second resistor, wherein a cathode of the first voltage regulator tube is connected to the control end of the switch unit and the first end of the first resistor, respectively, an anode of the first voltage regulator tube is connected to the cathode of the first reference source, and a reference electrode of the first reference source is connected to the second end of the first resistor and the first end of the second resistor, respectively, and an anode of the first reference source is connected to the second end of the second resistor.
5. The input disturbance optimizing circuit according to claim 1, wherein the switching unit comprises a first switching tube, a control end of the first switching tube is connected to an output end of the open loop control unit, a first end of the first switching tube is connected to a power supply input end, and a second end of the first switching tube serves as an output end of the input disturbance optimizing circuit.
6. The input disturbance optimizing circuit according to claim 1, further comprising a current limiting circuit connected between the output of the open loop control unit and the control terminal of the switching unit.
7. The input disturbance optimizing circuit according to claim 6, wherein the current limiting circuit comprises a third resistor, a first end of the third resistor is connected to the control end of the switching unit, and a second end of the third resistor is connected to the output end of the open loop control unit.
8. The input disturbance optimizing circuit according to claim 1, further comprising a start-up buffer circuit, wherein an output terminal of the start-up buffer circuit is connected to a power supply terminal of the open loop control unit.
9. The input disturbance optimizing circuit according to claim 8, wherein the start-up buffer circuit comprises a fourth resistor, a fifth resistor and a second switching tube, wherein a first end of the fourth resistor is connected to a first end of the fifth resistor, a second end of the fourth resistor is connected to a first end of the second switching tube, a second end of the fifth resistor is connected to a control end of the second switching tube, and a second end or the control end of the second switching tube is connected to a power supply end of the open loop control unit.
10. The input disturbance optimizing circuit according to claim 9, wherein the start-up buffer circuit further comprises a sixth resistor, a first end of the sixth resistor is connected to the control end of the second switching tube, and a second end of the sixth resistor is connected to the power supply end of the open loop control unit.
11. The input disturbance optimizing circuit according to claim 1, wherein the open loop control unit comprises a first reference source, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a second switching tube, a first diode and a first capacitor, wherein a first end of the first resistor is connected to a control end of the switching unit, a second end of the first resistor is connected to a cathode of the first diode and a first end of the first capacitor, respectively, a first end of the second switching tube is connected to a second end of the second resistor, a second end of the second switching tube is connected to an anode of the first diode, a first end of the second resistor, a cathode of the first reference source and a first end of the third resistor are all connected to a power supply input end, a second end of the third resistor is connected to a control end of the first reference source and a first end of the fourth resistor, respectively, and a control end of the second switching tube is connected to an anode of the first reference source, a second end of the second switching tube is connected to a first end of the first resistor, and a first end of the fifth resistor is connected to a first end of the first resistor, respectively.
12. An input disturbance optimization circuit is characterized by comprising a voltage source unit and a switch unit; the voltage source unit is used for outputting stable control voltage to the control end of the switch unit according to the input voltage from the power input end or an external power supply; and the switching unit is used for controlling the switching unit to be turned on or turned off according to the stable control voltage so that the input disturbance optimization circuit outputs the stable voltage.
13. A control method of an input disturbance optimization circuit, the input disturbance optimization circuit comprising an open loop control unit and a switching unit, the control method comprising: and responding to a control signal received from the power input end or an external power supply, stabilizing the control signal and controlling the on or off of the switch unit through the open loop of the stabilized control signal, so that the input disturbance optimizing circuit outputs a stabilized voltage.
14. A control method of an input disturbance optimization circuit, the input disturbance optimization circuit including a voltage source unit and a switching unit, the control method comprising: Outputting a stable control voltage to a control terminal of the switching unit according to an input voltage from the power input terminal or an external power source; and controlling the on or off of the switching unit according to the stable control voltage so that the input disturbance optimization circuit outputs the stable voltage.
15. A switching power supply is characterized in that the switching power supply comprises an input disturbance optimization circuit according to any one of claims 1-12.

Description

Input disturbance optimization circuit, control method and switching power supply Technical Field The invention relates to the field of switching power supplies, in particular to an input disturbance optimization circuit, a control method and a switching power supply. Background In recent years, technologies such as precision measuring instruments, medical fields, communication fields, scientific research fields and the like are becoming mature. In precision measuring instruments, the accuracy of measured data is higher and higher, and the stability requirements of the equipment on a power supply are higher and higher. Test equipment such as oscilloscopes, spectrometers also require low noise interference power supplies, which otherwise can affect test results. In medical devices, power instability can directly affect the diagnostic result. In the field of communications, power supply noise can interfere with the transmission of signals, resulting in signal instability, affecting the quality of communications. As technology matures, noise interference requirements on power supplies become higher. The output of the switching power supply needs to meet the requirement of low noise interference, and the higher the noise suppression effect is, the more the filter devices are required. Therefore, the design of the product is limited, the volume is enlarged, and the cost is increased. The conventional way of adding a filter device to the whole product reduces noise interference or realizes a filter effect, so that output noise interference is reduced, but the way increases the weight of the product and has high cost. The voltage stabilizing circuit is used for achieving stable output and achieving filtering, but the existing voltage stabilizing circuit is used for achieving stable output through a closed loop of a voltage stabilizing tube and a switching tube, the scheme is poor in stability, and when the input voltage is high in high-frequency fluctuation or the voltage stabilizing tube has temperature drift to cause the change of a voltage stabilizing value, the voltage stabilizing circuit is insufficient in adjustment capability to cause output fluctuation, and the achieved filtering effect is poor. Disclosure of Invention The invention aims to provide an input disturbance optimization circuit, a control method and a switching power supply, which solve the problem that the filtering effect is poor through more filtering devices or the existing voltage stabilizing circuit in the prior art, and provide a circuit for realizing stable filtering effect so as to solve the problem that the filtering effect is poor due to temperature drift of the voltage stabilizing value change caused by more filtering devices or the existing voltage stabilizing circuit voltage stabilizing tube in the prior art in product design. In order to achieve the above purpose, the present invention adopts the following technical scheme: In a first aspect, the present invention provides an input disturbance optimization circuit, the input disturbance optimization circuit comprising an open loop control unit and a switch unit, wherein an output end of the open loop control unit is connected to a control end of the switch unit, and an input end of the open loop control unit is connected to a power input end or an input voltage of an external power supply; The open loop control unit is used for responding to the control signal received from the power input end or an external power supply, stabilizing the control signal and controlling the on or off of the switch unit in an open loop mode through the stabilized control signal, so that the input disturbance optimizing circuit outputs stable voltage. Optionally, the open loop control unit includes a voltage stabilizing device or a direct current source. Optionally, the open loop control unit includes a first voltage regulator tube, and a cathode of the first voltage regulator tube is connected to a control end of the switch unit. Optionally, the open loop control unit includes a first voltage stabilizing tube, a first reference source, a first resistor and a second resistor, wherein a cathode of the first voltage stabilizing tube is connected to the control end of the switch unit and the first end of the first resistor, an anode of the first voltage stabilizing tube is connected to the cathode of the first reference source, a reference electrode of the first reference source is connected to the second end of the first resistor and the first end of the second resistor, and an anode of the first reference source is connected to the second end of the second resistor. Optionally, the switching unit includes a first switching tube, a control end of the first switching tube is connected to an output end of the open loop control unit, a first end of the first switching tube is connected to a power input end, and a second end of the first switching tube is used as an output end of the input disturbance opti