Search

CN-224218285-U - Isolation power supply module

CN224218285UCN 224218285 UCN224218285 UCN 224218285UCN-224218285-U

Abstract

The utility model provides an isolated power supply module which comprises a primary side circuit, a secondary side circuit, a feedback circuit and a resistance adjustable unit, wherein the primary side circuit comprises a control chip and a primary side winding, the secondary side circuit comprises at least one secondary side rectifying circuit, the feedback circuit is respectively and electrically connected with the primary side winding and the control chip, or the feedback circuit is respectively and electrically connected with any secondary side rectifying circuit and the control chip, and the resistance adjustable unit is electrically connected with the feedback circuit. According to the utility model, the resistance value adjustable unit is added on the basis of the feedback circuit of the primary side circuit side or the secondary side circuit side, so that the feedback voltage adjustment can be realized, and the control chip can change the conduction time of the primary side winding according to the change of the feedback voltage, thereby adjusting the output voltage, isolating the input voltage and the output voltage of the power supply module, realizing wide-range adjustment, improving the voltage compatibility of the power supply module and meeting the requirements of different driving scenes.

Inventors

  • ZHAO HUI
  • Lei Shunkai
  • ZHANG XUEYI

Assignees

  • 成都英飞源智慧能源有限公司

Dates

Publication Date
20260508
Application Date
20250424

Claims (10)

  1. 1. The isolation power supply module is characterized by comprising a primary side circuit, a secondary side circuit, a feedback circuit and a resistance value adjustable unit, wherein the primary side circuit comprises a control chip and a primary side winding, and the secondary side circuit comprises at least one secondary side rectifying circuit; the feedback circuit is respectively and electrically connected with the primary winding and the control chip, or is respectively and electrically connected with any secondary rectifying circuit and the control chip, and the resistance value adjustable unit is electrically connected with the feedback circuit.
  2. 2. The isolated power module of claim 1, wherein the primary winding comprises a primary main winding and a primary auxiliary winding, the primary main winding is electrically connected to the control chip, one end of the primary auxiliary winding is grounded, and the other end of the primary auxiliary winding is electrically connected to the control chip and the feedback circuit, respectively.
  3. 3. The isolated power module of claim 2, wherein the primary circuit further comprises a diode, the anode of the diode being electrically connected to the other end of the primary auxiliary winding, the cathode of the diode being electrically connected to the control chip.
  4. 4. The isolated power module of claim 3, wherein a first end of the feedback circuit is electrically connected to the anode of the diode and a second end of the feedback circuit is electrically connected to the control chip.
  5. 5. The isolated power module of claim 3, wherein a first end of the feedback circuit is electrically connected to the negative electrode of the diode and a second end of the feedback circuit is electrically connected to the control chip.
  6. 6. The isolated power module of claim 4 or 5, wherein the feedback circuit comprises a first resistor and a second resistor, one end of the first resistor is electrically connected to the diode, the other end of the first resistor is electrically connected to one end of the second resistor, the control chip and the resistance-adjustable unit, respectively, and the other end of the second resistor is grounded.
  7. 7. The isolated power module of claim 1, wherein the feedback circuit comprises a regulator tube, an optocoupler, and a resistive voltage divider unit; The optocoupler is respectively and electrically connected with the control chip, the voltage stabilizing tube and the secondary side rectifying circuit, the resistance voltage dividing unit is respectively and electrically connected with the secondary side rectifying circuit and the voltage stabilizing tube, and the resistance value adjustable unit is electrically connected with the resistance voltage dividing unit.
  8. 8. The isolated power module of claim 7, wherein the resistor divider unit comprises a third resistor and a fourth resistor; One end of the third resistor is electrically connected with any secondary side rectifying circuit, the other end of the third resistor is respectively electrically connected with the voltage stabilizing tube, one end of the fourth resistor and the resistance value adjustable unit, and the other end of the fourth resistor is grounded.
  9. 9. The isolated power module of any of claims 1-8, wherein the resistance adjustable unit comprises a plurality of resistance adjustable subunits, the resistance adjustable subunits comprising a fifth resistor and a switching device; One end of the fifth resistor is electrically connected with the feedback circuit, the other end of the fifth resistor is electrically connected with the first end of the switching device, the second end of the switching device is grounded, and the third end of the switching device is electrically connected with an external control unit.
  10. 10. The isolated power module of claim 9, wherein the switching device comprises any one of a MOS tube and an IGBT tube.

Description

Isolation power supply module Technical Field The utility model relates to the technical field of power supplies, in particular to an isolated power supply module. Background The wide application of the third generation semiconductor SiC MOSFET has raised higher requirements on a driving power supply. However, siC device driving voltage standards of different manufacturers are not uniform, and there are various specifications of 18V, 15V, even 12V, and the like. Therefore, when changing SiC MOSFETs of different manufacturers, it is necessary to change the associated drive power supply. For this reason, an isolated driving power supply having a wide voltage output range is particularly important. The existing DC-DC isolation driving power supply can be divided into an open loop control mode and a closed loop control mode according to different control modes. The traditional open loop scheme has no feedback mechanism, the output is directly determined by the input and the transformer, and the automatic regulation capability is not realized, so that the indexes of the output such as voltage stabilization precision, load regulation rate, linear regulation rate and the like are poor, the input range has poor adaptability, and the regulation in a larger range (for example, 9 to 36V) is not realized. The closed loop scheme samples output voltage through a feedback network, and then adjusts PWM signals after comparing the output voltage with reference voltage, so that voltage stabilization can be realized, indexes such as voltage stabilization precision, load adjustment rate, linear adjustment rate and the like are greatly optimized, and the closed loop scheme has good input range adaptability and can realize large-range (for example, 9-36V) adjustment. However, the conventional closed-loop scheme has drawbacks, such as fixed output voltage, difficulty in realizing large-range adjustment, and high complexity in driving power supply design due to the need of adjusting internal circuits and parameters of the module if the output voltage is to be adjusted. Disclosure of utility model The utility model provides an isolated power supply module, which aims to solve the problem that the output voltage of a closed-loop control scheme in the related art is difficult to realize large-range adjustment. In order to solve the technical problems, the utility model provides an isolated power module which comprises a primary side circuit, a secondary side circuit, a feedback circuit and a resistance adjustable unit, wherein the primary side circuit comprises a control chip and a primary side winding, the secondary side circuit comprises at least one secondary side rectifying circuit, the feedback circuit is respectively and electrically connected with the primary side winding and the control chip, or the feedback circuit is respectively and electrically connected with any secondary side rectifying circuit and the control chip, and the resistance adjustable unit is electrically connected with the feedback circuit. Further, the primary winding comprises a primary main winding and a primary auxiliary winding, the primary main winding is electrically connected with the control chip, one end of the primary auxiliary winding is grounded, and the other end of the primary auxiliary winding is electrically connected with the control chip and the feedback circuit respectively. Further, a first end of the feedback circuit is electrically connected with the anode of the diode, and a second end of the feedback circuit is electrically connected with the control chip. Further, a first end of the feedback circuit is electrically connected with the cathode of the diode, and a second end of the feedback circuit is electrically connected with the control chip. Further, the feedback circuit comprises a first resistor and a second resistor, one end of the first resistor is electrically connected with the diode, the other end of the first resistor is respectively electrically connected with one end of the second resistor, the control chip and the resistance value adjustable unit, and the other end of the second resistor is grounded. The feedback circuit comprises a voltage stabilizing tube, an optical coupler and a resistor voltage dividing unit, wherein the optical coupler is respectively and electrically connected with the control chip, the voltage stabilizing tube and the secondary rectifying circuit, the resistor voltage dividing unit is respectively and electrically connected with the secondary rectifying circuit and the voltage stabilizing tube, and the resistor value adjustable unit is electrically connected with the resistor voltage dividing unit. The resistor voltage dividing unit comprises a third resistor and a fourth resistor, one end of the third resistor is electrically connected with any secondary side rectifying circuit, the other end of the third resistor is respectively electrically connected with the voltage stabilizing tube, one end