Controller for controlling phase-shifted full-bridge circuit, power supply module, and electronic device
A controller for controlling a phase-shifted full-bridge circuit, a power supply module, and an electronic device. The phase-shifted full-bridge circuit includes a first leg and a second leg. A working state of the phase-shifted full-bridge circuit includes a first working state and a second working state. The controller is configured to: detect a load level of a load circuit coupled to the phase-shifted full-bridge circuit, and control, based on the load level, the phase-shifted full-bridge circuit to switch the running working state. When the phase-shifted full-bridge circuit runs in the first working state, the first leg is a leading leg, and the second leg is a lagging leg. When the phase-shifted full-bridge circuit runs in the second working state, the first leg is a lagging leg, and the second leg is a leading leg.
1 . A controller for controlling a phase-shifted full-bridge circuit, wherein the phase-shifted full-bridge circuit comprises a first leg and a second leg, the first leg comprises a first high-side switch and a first low-side switch, the second leg comprises a second high-side switch and a second low-side switch, a working state of the phase-shifted full-bridge circuit comprises a first working state and a second working state, and the controller is configured to:
detect a load level of a load circuit coupled to the phase-shifted full-bridge circuit; and
control, based on the load level, the phase-shifted full-bridge circuit to switch the working state, wherein,
when the phase-shifted full-bridge circuit runs in the first working state, the first leg is a leading leg, and the second leg is a lagging leg; or
when the phase-shifted full-bridge circuit runs in the second working state, the first leg is a lagging leg, and the second leg is a leading leg;
detect the load level based on a comparison result between an output current of the phase-shifted full-bridge circuit and a first current threshold or a second current threshold, wherein the second current threshold is greater than the first current threshold;
in response to that the output current is less than or equal to the first current threshold, and the load level detected by the controller is a light load, the controller controls the phase-shifted full-bridge circuit to run in the second working state; or
in response to that the output current is greater than or equal to the second current threshold, and the load level detected by the controller is a heavy load, the controller controls the phase-shifted full-bridge circuit to run in the first working state.
2 . The controller according to claim 1 , wherein, when controlling, based on the load level, the phase-shifted full-bridge circuit to switch the working state, the controller is further configured to:
when the load level is a heavy load, and a current working state of the phase-shifted full-bridge circuit is the second working state, switch the working state of the phase-shifted full-bridge circuit to the first working state; or
when the load level is a light load, and a current working state of the phase-shifted full-bridge circuit is the first working state, switch the working state of the phase-shifted full-bridge circuit to the second working state.
3 . The controller according to claim 1 , wherein, when controlling the phase-shifted full-bridge circuit to switch the working state, the controller is further configured to:
stop sending turn-on drive signals to the first high-side switch, the first low-side switch, the second high-side switch, and the second low-side switch, so that the phase-shifted full-bridge circuit stops running in the current working state; and
after a preset duration, send the turn-on drive signals to the first high-side switch, the first low-side switch, the second high-side switch, and the second low-side switch based on a working state after switching.
4 . The controller according to claim 1 , wherein, when controlling the phase-shifted full-bridge circuit to switch the working state, the controller is further configured to:
adjust a phase angle and a sequence between the turn-on drive signals sent to the first high-side switch and the second low-side switch, and
adjust a phase angle and a sequence between the turn-on drive signals sent to the first low-side switch and the second high-side switch.
5 . The controller according to claim 4 , wherein the controller is further configured to:
adjust the phase angle to be greater than 0° and less than or equal to 180°; and
control the first high-side switch to be turned on before the second low-side switch, and the second high-side switch to be turned on before the first low-side switch, so that the phase-shifted full-bridge circuit runs in the first working state; or
control the first high-side switch to be turned on after the second low-side switch, and the second high-side switch to be turned on after the first low-side switch, so that the phase-shifted full-bridge circuit runs in the second working state.
6 . The controller according to claim 4 , wherein the controller is further configured to:
adjust the phase angle to be greater than 180° and less than or equal to 360°; and
control the first high-side switch to be turned on before the second low-side switch, and the second high-side switch to be turned on before the first low-side switch, so that the phase-shifted full-bridge circuit runs in the second working state; or
control the first high-side switch to be turned on after the second low-side switch, and the second high-side switch to be turned on after the first low-side switch, so that the phase-shifted full-bridge circuit runs in the first working state.
7 . A power supply module, comprising a phase-shifted full-bridge circuit and a controller, wherein the phase-shifted full-bridge circuit comprises a first leg and a second leg, the first leg comprises a first high-side switch and a first low-side switch, the second leg comprises a second high-side switch and a second low-side switch, and the controller is configured to control the phase-shifted full-bridge circuit to supply power to a load circuit of the power supply module;
a working state of the phase-shifted full-bridge circuit comprises a first working state and a second working state; and
when the phase-shifted full-bridge circuit runs in the first working state, the first leg is a leading leg, and the second leg is a lagging leg; or
when the phase-shifted full-bridge circuit runs in the second working state, the first leg is a lagging leg, and the second leg is a leading leg; and
the controller is configured to control, based on a load level of the load circuit, the phase-shifted full-bridge circuit to switch the working state; and the controller comprises:
a detection terminal, wherein the detection terminal is configured to detect the load level of the load circuit; and
a drive terminal, wherein the drive terminal is configured to send turn-on drive signals to the first high-side switch and the first low-side switch of the first leg, and the second high-side switch and the second low-side switch of the second leg, wherein the controller is configured to adjust, based on the load level detected by the detection terminal, the drive signals output by the drive terminal, to control the phase-shifted full-bridge circuit to run in the first working state or the second working state;
the load level comprises a light load and a heavy load, when detecting the load level of the load circuit, the detection terminal of the controller is further configured to:
detect the load level based on a comparison result between an output current of the phase-shifted full-bridge circuit and a preset first current threshold or a preset second current threshold, wherein the second current threshold is greater than the first current threshold, wherein,
when the output current is less than or equal to the first current threshold, the load level is the light load; or
when the output current is greater than or equal to the second current threshold, the load level is the heavy load.
8 . The power supply module according to claim 7 , wherein the load level of the load circuit of the power supply module comprises a light load and a heavy load;
in response to switching the load level from the light load to the heavy load, the controller controls the phase-shifted full-bridge circuit to switch from the second working state to the first working state; and
in response to switching the load level from the heavy load to the light load, the controller controls the phase-shifted full-bridge circuit to switch from the first working state to the second working state.
9 . The power supply module according to claim 7 , wherein, when controlling the phase-shifted full-bridge circuit to switch the working state, the controller is further configured to:
adjust a phase angle and a sequence between the turn-on drive signals sent to the first high-side switch and the second low-side switch; and
adjust a phase angle and a sequence between the turn-on drive signals sent to the first low-side switch and the second high-side switch.
10 . The power supply module according to claim 9 , wherein the controller is further configured to:
adjust the phase angle to be greater than 0° and less than or equal to 180°, and
control the first high-side switch to be turned on before the second low-side switch, and the second high-side switch to be turned on before the first low-side switch, so that the phase-shifted full-bridge circuit runs in the first working state; or
adjust the phase angle to be greater than 0° and less than or equal to 180°, and
control the first high-side switch to be turned on after the second low-side switch, and the second high-side switch to be turned on after the first low-side switch, so that the phase-shifted full-bridge circuit runs in the second working state.
11 . The power supply module according to claim 9 , wherein the controller is further configured to:
adjust the phase angle to be greater than 180° and less than or equal to 360°, and
control the first high-side switch to be turned on before the second low-side switch, and the second high-side switch to be turned on before the first low-side switch, so that the phase-shifted full-bridge circuit runs in the second working state; or
adjust the phase angle to be greater than 180° and less than or equal to 360°, and
control the first high-side switch to be turned on after the second low-side switch, and the second high-side switch to be turned on after the first low-side switch, so that the phase-shifted full-bridge circuit runs in the first working state.
12 . The power supply module according to claim 7 , wherein, when controlling the phase-shifted full-bridge circuit to switch the working state, the controller is further configured to:
stop sending the turn-on drive signals to the first high-side switch, the first low-side switch, the second high-side switch, and the second low-side switch; and after a preset duration,
send the turn-on drive signals to the first high-side switch, the first low-side switch, the second high-side switch, and the second low-side switch based on a working state after switching.
13 . An electronic device, wherein the electronic device comprises a phase-shifted full-bridge circuit and a controller for controlling a phase-shifted full-bridge circuit, wherein the phase-shifted full-bridge circuit comprises a first leg and a second leg, the first leg comprises a first high-side switch and a first low-side switch, the second leg comprises a second high-side switch and a second low-side switch, a working state of the phase-shifted full-bridge circuit comprises a first working state and a second working state, and the controller is configured to:
detect a load level of a load circuit coupled to the phase-shifted full-bridge circuit; and
control, based on the load level, the phase-shifted full-bridge circuit to switch the working state, wherein,
when the phase-shifted full-bridge circuit runs in the first working state, the first leg is a leading leg, and the second leg is a lagging leg; or
when the phase-shifted full-bridge circuit runs in the second working state, the first leg is a lagging leg, and the second leg is a leading leg;
detect the load level based on a comparison result between an output current of the phase-shifted full-bridge circuit and a first current threshold or a second current threshold, wherein the second current threshold is greater than the first current threshold;
in response to that the output current is less than or equal to the first current threshold, and the load level detected by the controller is a light load, the controller controls the phase-shifted full-bridge circuit to run in the second working state; or
in response to that the output current is greater than or equal to the second current threshold, and the load level detected by the controller is a heavy load, the controller controls the phase-shifted full-bridge circuit to run in the first working state.