Auxiliary power supply and control method, program product, power distribution system
By monitoring and controlling the power conversion module in real time, the energy storage unit is ensured to operate within the normal temperature range, which solves the problems of performance degradation and safety accidents of auxiliary power supply equipment under abnormal temperatures, and improves the reliability and long service life of the auxiliary power supply.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA GRIDCOM
- Filing Date
- 2026-02-02
- Publication Date
- 2026-06-16
Smart Images
Figure CN122225640A_ABST
Abstract
Claims
1. An auxiliary power supply, characterized in that, include: The energy storage unit includes an input port and an output port, wherein the input port is used for electrical connection to the main power supply, and the output port is used for providing auxiliary power supply voltage. A first power conversion module, wherein the input terminal of the first power conversion module is electrically connected to the input port, and the output terminal of the first power conversion module is electrically connected to the energy storage unit, and the first power conversion module is configured to use the power of the input port as the charging voltage for the energy storage unit; The second power conversion module has its input terminal electrically connected to the energy storage unit and its output terminal electrically connected to the output port. The second power conversion module is configured to convert the electrical energy stored in the energy storage unit into the auxiliary power supply voltage. A temperature detection module is thermally coupled to the energy storage unit and configured to detect the temperature of the energy storage unit; The controller is electrically connected to the first power conversion module, the second power conversion module and the temperature detection module respectively. The controller is configured to control the second power conversion module to start when the output voltage of the first power conversion module is less than or equal to a first voltage threshold and the temperature of the energy storage unit is within the normal operating range.
2. The auxiliary power supply according to claim 1, characterized in that, The auxiliary power supply also includes: A charging circuit, wherein the input terminal of the charging circuit is electrically connected to the output terminal of the first power conversion module, and the output terminal of the charging circuit is electrically connected to the energy storage unit; The controller is electrically connected to the charging circuit and the energy storage unit respectively. The controller is also configured to control the charging circuit to charge the energy storage unit using the electrical energy output by the first energy conversion module when the output voltage of the first energy conversion module is greater than the first voltage threshold and the voltage of the energy storage unit is greater than the second voltage threshold.
3. The auxiliary power supply according to claim 2, characterized in that, The charging circuit includes: An energy storage inductor, wherein the first terminal of the energy storage inductor is electrically connected to the positive output terminal of the first energy conversion module; The first switching transistor has its first end electrically connected to the second end of the energy storage inductor, and its second end electrically connected to the negative output terminal of the first energy conversion module. The first unidirectional conducting device has its input terminal electrically connected to the first terminal of the first switching transistor, and its input terminal is electrically connected to the energy storage unit.
4. The auxiliary power supply according to claim 3, characterized in that, The controller is also configured to adjust the switching duty cycle in the charging circuit based on the voltage of the energy storage unit and / or the temperature of the energy storage unit, so as to adjust the charging current output by the charging circuit.
5. The auxiliary power supply according to claim 4, characterized in that, The controller is specifically configured as follows: When the voltage of the energy storage unit is less than or equal to a third voltage threshold, and the temperature of the energy storage unit is greater than or equal to a first temperature threshold and less than a second temperature threshold, the charging circuit is controlled to output a first charging current. When the voltage of the energy storage unit is less than or equal to the fourth voltage threshold and the temperature of the energy storage unit is greater than or equal to the second temperature threshold and less than the third temperature threshold, the charging circuit is controlled to output a second charging current. When the voltage of the energy storage unit is less than or equal to the fifth voltage threshold and the temperature of the energy storage unit is greater than or equal to the third temperature threshold and less than the fourth temperature threshold, the charging circuit is controlled to output a third charging current. Wherein, the second charging current is greater than the first charging current, and the second charging current is greater than the third charging current, the third voltage threshold is greater than the fourth voltage threshold, and the fourth voltage threshold is greater than the fifth voltage threshold.
6. The auxiliary power supply according to claim 5, characterized in that, The controller is also configured to control the charging circuit to stop working when the temperature of the energy storage unit is less than the first temperature threshold or greater than the fourth temperature threshold.
7. The auxiliary power supply according to claim 1, characterized in that, The controller is electrically connected to the energy storage unit, and the controller is further configured to control the second power conversion module to start when preset conditions are met; The preset conditions include: the voltage of the energy storage unit is greater than or equal to the sixth voltage threshold, and the temperature of the energy storage unit is within the normal operating range.
8. The auxiliary power supply according to claim 7, characterized in that, The controller includes a timing module, which is configured to start the second power conversion module when the preset conditions are met and a preset delay time set by the timing module is reached.
9. The auxiliary power supply according to any one of claims 1-8, characterized in that, The first power conversion module includes: A rectifier circuit, wherein the AC side of the rectifier circuit is electrically connected to the input port; A step-down circuit is provided, wherein the input terminal of the step-down circuit is electrically connected to the DC side of the rectifier circuit, and the output terminal of the step-down circuit is electrically connected to the energy storage unit.
10. The auxiliary power supply according to claim 9, characterized in that, The rectifier circuit includes: A common-mode inductor, wherein the first end of the common-mode inductor is connected to the live wire of the input port, and the second end of the common-mode inductor is connected to the neutral wire of the input port; A full-bridge circuit, wherein the AC input terminal of the full-bridge circuit is electrically connected to the first terminal and the second terminal of the common-mode inductor, respectively; A filter capacitor is connected in parallel between the positive and negative output terminals of the full-bridge circuit. The output terminal of the full-bridge circuit is connected to the input terminal of the buck circuit.
11. The auxiliary power supply according to claim 10, characterized in that, The step-down circuit includes: The first transformer includes a first primary winding and a first secondary winding, wherein the first end of the first primary winding is electrically connected to the positive output terminal of the full-bridge circuit. The second switching transistor has its first end electrically connected to the second end of the first primary winding, and its second end electrically connected to the negative output terminal of the full-bridge circuit. The second unidirectional conducting device has its input terminal electrically connected to the first secondary winding and its output terminal electrically connected to the energy storage unit.
12. The auxiliary power supply according to claim 11, characterized in that, The step-down circuit also includes: A first absorption circuit is configured to absorb voltage spikes generated by the operation of the second switching transistor. The first terminal of the first absorption circuit is electrically connected to the positive output terminal of the full-bridge circuit, and the second terminal of the first absorption circuit is electrically connected to the first terminal of the second switching transistor.
13. The auxiliary power supply according to any one of claims 1-8, characterized in that, The energy storage unit includes: The protection circuit has its first terminal electrically connected to the output terminal of the first power conversion module. A nickel-metal hydride battery pack, wherein the nickel-metal hydride battery pack is electrically connected to the second terminal of the protection circuit and the input terminal of the second power conversion module, respectively; The protection circuit is configured to disconnect the current path between the first power conversion module and the energy storage unit when the output current of the first power conversion module is greater than the current threshold.
14. The auxiliary power supply according to claim 13, characterized in that, The protection circuit includes a fuse connected in series between the output of the first power conversion module and the nickel-metal hydride battery pack.
15. The auxiliary power supply according to claim 13, characterized in that, The nickel-metal hydride battery pack comprises multiple nickel-metal hydride battery cells connected in series.
16. The auxiliary power supply according to any one of claims 1-8, characterized in that, The second power conversion module includes: A boost circuit is provided, wherein the input terminal of the boost circuit is electrically connected to the energy storage unit, and the output terminal of the boost circuit is electrically connected to the output port. The boost circuit is configured to boost the electrical energy stored in the energy storage unit and use it as the auxiliary power supply voltage.
17. The auxiliary power supply according to claim 16, characterized in that, The boost circuit includes: The second transformer includes a second primary winding and a second secondary winding, wherein the first end of the second primary winding is electrically connected to the positive terminal of the energy storage unit. The third switch has its first end electrically connected to the second end of the second primary winding, and its second end electrically connected to the negative terminal of the energy storage unit. The third unidirectional conducting device has its input terminal electrically connected to the second secondary winding and its output terminal electrically connected to the output port.
18. The auxiliary power supply according to any one of claims 1-8, characterized in that, The auxiliary power supply also includes: The heat preservation circuit is electrically connected to the output terminal of the first power conversion module and thermally coupled to the energy storage unit. The heat preservation circuit is configured to generate heat to keep the energy storage unit warm.
19. The auxiliary power supply according to claim 18, characterized in that, The heat preservation circuit includes: A switching unit, wherein the first end of the switching unit is electrically connected to the output end of the first power conversion module, and the driving end of the switching unit is electrically connected to the controller; A heating resistor is connected to the second end of the switching unit and is thermally coupled to the energy storage unit. The heating resistor is used to generate heat to keep the energy storage unit warm when the switching unit is turned on.
20. The auxiliary power supply according to any one of claims 1-8, characterized in that, The temperature detection module includes: A voltage divider resistor, wherein the first end of the voltage divider resistor is electrically connected to the reference voltage node; A negative temperature coefficient resistor, wherein the first end of the negative temperature coefficient resistor is electrically connected to the second end of the voltage divider resistor, and the second end of the negative temperature coefficient resistor is electrically connected to the grounding node; The controller is electrically connected to the connection node of the voltage divider resistor and the negative temperature coefficient resistor, and is configured to obtain the temperature of the energy storage unit based on the voltage value of the connection node.
21. The auxiliary power supply according to any one of claims 1-8, characterized in that, The auxiliary power supply also includes: At least one status indicator light; The controller is electrically connected to the status indicator light. The controller is configured to control the corresponding status indicator light to light up according to different working states of the auxiliary power supply, so as to indicate at least one of the following states: battery fault, high temperature alarm, normal operation of main power supply, energy storage unit charging, and energy storage unit discharging output.
22. A method for controlling an auxiliary power supply, characterized in that, An auxiliary power supply according to any one of claims 1-21, the auxiliary power supply comprising a charging circuit electrically connected between the output terminal of the first power conversion module and the energy storage unit, the control method comprising: Obtain the output voltage of the first power conversion module and the voltage of the energy storage unit; When the output voltage of the first power conversion module is greater than the first voltage threshold and the voltage of the energy storage unit is greater than the second voltage threshold, the charging circuit is controlled to charge the energy storage unit using the output voltage of the first power conversion module. When the output voltage of the first power conversion module is less than or equal to the first voltage threshold, and when preset conditions are met, the second power conversion module is controlled to convert the electrical energy stored in the energy storage unit into an auxiliary power supply voltage.
23. The auxiliary power supply control method according to claim 22, characterized in that, The control of the charging circuit to charge the energy storage unit using the output voltage of the first power conversion module includes: Obtain the temperature of the energy storage unit; The charging current output by the charging circuit is adjusted based on the voltage and / or temperature of the energy storage unit to charge the energy storage unit.
24. The auxiliary power supply control method according to claim 23, characterized in that, The charging current output by the charging circuit is adjusted based on the voltage and temperature of the energy storage unit to charge the energy storage unit, including: When the voltage of the energy storage unit is less than or equal to a third voltage threshold, and the temperature of the energy storage unit is greater than or equal to a first temperature threshold and less than a second temperature threshold, the charging circuit is controlled to output a first charging current. When the voltage of the energy storage unit is less than or equal to the fourth voltage threshold and the temperature of the energy storage unit is greater than or equal to the second temperature threshold and less than the third temperature threshold, the charging circuit is controlled to output a second charging current. When the voltage of the energy storage unit is less than or equal to the fifth voltage threshold and the temperature of the energy storage unit is greater than or equal to the third temperature threshold and less than the fourth temperature threshold, the charging circuit is controlled to output a third charging current. Wherein, the second charging current is greater than the first charging current, and the second charging current is greater than the third charging current.
25. The auxiliary power supply control method according to claim 24, characterized in that, The control method further includes: When the temperature of the energy storage unit is lower than the first temperature threshold or higher than the fourth temperature threshold, the charging circuit is controlled to stop working.
26. The auxiliary power supply control method according to claim 22, characterized in that, Under preset conditions, controlling the second power conversion module to convert the electrical energy stored in the energy storage unit into an auxiliary power supply voltage includes: Obtain the voltage and temperature of the energy storage unit; When the voltage of the energy storage unit is greater than or equal to the sixth voltage threshold and the temperature of the energy storage unit is within the normal operating range, it is determined that the preset condition is met. The second power conversion module is controlled to convert the electrical energy stored in the energy storage unit into an auxiliary power supply voltage.
27. The auxiliary power supply control method according to claim 26, characterized in that, After the determination meets the preset conditions, it also includes: Start delay timer; When the delay time reaches the preset delay time, the second power conversion module is activated to convert the power of the energy storage unit into an auxiliary power supply voltage.
28. A computer program product, characterized in that, include: The acquisition module is used to acquire the output voltage of the first power conversion module; The first control module is used to control the charging circuit to charge the energy storage unit using the output voltage of the first energy conversion module when the output voltage of the first energy conversion module is greater than the first voltage threshold. The second control module is used to control the second power conversion module to convert the electrical energy stored in the energy storage unit into an auxiliary power supply voltage when the output voltage of the first power conversion module is less than or equal to the first voltage threshold and when preset conditions are met.
29. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein the computer program, when executed by a processor, implements the control method for the auxiliary power supply according to any one of claims 1-7.
30. A power distribution system, characterized in that, It includes a power distribution terminal and an auxiliary power supply according to any one of claims 1-20, wherein the power distribution terminal is electrically connected to the output port of the auxiliary power supply.