Power supply system

Abstract

A power supply system includes a power conversion circuit and a control circuit. The power conversion circuit includes a primary side, a secondary side, and a transformer. The control circuit is used to: detect a first load parameter and a second load parameter; respond to the first load parameter and the second load parameter being within a predetermined threshold, control the output of a first output power and a second output power in a time-division multiplexing mode according to a first ratio; respond to the first load parameter and the second load parameter not being within the predetermined threshold, output the first output power and the second output power in a duty cycle multiplexing mode according to the first ratio.

Claims

1. A power supply system, comprising: A power conversion circuit includes: a primary side including a primary side switch; a secondary side including a plurality of secondary side switches, the secondary side switches being respectively coupled to a first output terminal and a second output terminal, a ratio of a first output power of one of the first output terminals to a second output power of one of the second output terminals being a first ratio; a transformer coupled between the primary side and the secondary side; and a control circuit for: detecting a first load parameter of one of the first output terminals and a second load parameter of one of the second output terminals; responding that the first load parameter and the second load parameter are within a predetermined threshold, controlling the primary side switch and the secondary side switches in a time-division multiplexing manner to output the first output power and the second output power; and responding that one of the first load parameter and the second load parameter is not within the predetermined threshold, controlling the primary side switch and the secondary side switches in a duty cycle multiplexing manner according to the first ratio to output the first output power and the second output power.

2. The power supply system as described in claim 1, wherein, When the primary-side switch is turned on, the control circuit turns on one of the secondary-side switches at the first output terminal and the second output terminal, and turns off the other of the secondary-side switches at the first output terminal and the second output terminal.

3. The power supply system as described in claim 1, wherein, In the time-sharing multiplexing mode, when the first load parameter and the second load parameter are both within a predetermined threshold, the control circuit controls the primary side switch and the secondary side switches according to the first ratio in the time-sharing multiplexing mode.

4. The power supply system as described in claim 1, wherein, The control circuit is used to control the primary side switch according to a primary side control signal; wherein, in the shared responsibility cycle multiplexing mode, the primary side control signal includes a first excitation cycle and a second excitation cycle, the ratio of the first excitation cycle to the second excitation cycle is a second ratio, and the first ratio is equal to the second ratio.

5. The power supply system as described in claim 1, wherein, The secondary-side switches include a first switch group and a second switch group, the first switch group being coupled to the transformer and the first output terminal, and the second switch group being coupled to the transformer and the second output terminal.

6. The power supply system as described in claim 5, wherein, The first switch group includes a first sub-switch and a second sub-switch connected back-to-back to form bidirectional conduction, the first sub-switch and the second sub-switch being coupled between the transformer and the first output terminal; the second switch group includes a third sub-switch and a fourth sub-switch connected back-to-back to form bidirectional conduction, the third sub-switch and the fourth sub-switch being coupled between the transformer and the second output terminal.

7. The power supply system as described in claim 1, wherein, The secondary side further includes a current conductor, one side of which is coupled to the transformer and the other side of which is coupled to the secondary side switches.

8. The power supply system as described in claim 1, wherein, The predetermined threshold is that the variation of each load parameter at the corresponding output should be within 25%.

9. The power supply system as described in claim 1, wherein, Each of these load parameters corresponds to an output voltage, a load current, an output power, or a load feedback variation at the corresponding output terminal.

10. The power supply system as described in claim 1, wherein, The control circuit is further configured to: obtain a first load change rate, one of the first load parameters, and a second load change rate, one of the second load parameters; control the primary-side switch and the secondary-side switches in a time-division multiplexing manner to output the first output power and the second output power in response to the first load change rate and the second load change rate being within a predetermined threshold; and control the primary-side switch and the secondary-side switches in a duty cycle multiplexing manner according to the first ratio to output the first output power and the second output power in response to the first load change rate and the second load change rate being outside the predetermined threshold.

11. The power supply system as claimed in claim 10 further includes a feedback circuit, one side of which is coupled to the control circuit and the other side of which is coupled to the first output terminal and the second output terminal, the feedback circuit being used to obtain the first load change rate and the second load change rate according to the first load parameter and the second load parameter, respectively.

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