Converter control method, converter control apparatus, and readable storage medium
Embodiments of this application provide a converter control method, a converter control apparatus, and a readable storage medium. The control method includes: obtaining a real-time input voltage and a real-time output voltage of a converter; determining a corresponding real-time closed-loop control output value of the converter based on the real-time input voltage and the real-time output voltage by using a closed-loop control algorithm; determining a real-time control strategy of a switch tube of the converter from at least three control strategies based on the real-time closed-loop control output value; and controlling the switch tube based on the determined real-time control strategy. The control method is used to implement efficient and high-precision voltage stabilization control.
1. A method for controlling a converter, wherein the converter comprises a switch tube, and the method comprises:
obtaining a real-time input voltage and a real-time output voltage of the converter;
determining a corresponding real-time closed-loop control output value of the converter based on the real-time input voltage and the real-time output voltage by using a closed-loop control algorithm;
determining a real-time control strategy of the switch tube from a plurality of control strategies based on the real-time closed-loop control output value; and
controlling the switch tube based on the determined real-time control strategy;
wherein when the converter is an isolated resonant direct current converter, determining the real-time control strategy of the switch tube from the plurality of control strategies based on the real-time closed-loop control output value comprises:
when the real-time closed-loop control output value is greater than or equal to a first preset value, determining the real-time control strategy as a pulse frequency modulation control strategy;
when the real-time closed-loop control output value is less than the first preset value and greater than a second preset value, determining the real-time control strategy as a pulse width modulation control strategy, wherein the first preset value is greater than the second preset value; and
when the real-time closed-loop control output value is less than or equal to the second preset value, determining the real-time control strategy as a pulse density modulation control strategy.
2. The method according to claim 1 , wherein the plurality of control strategies comprise at least three of:
a pulse frequency modulation control strategy,
a pulse width modulation control strategy,
a pulse density modulation control strategy, and
a pulse phase modulation control strategy.
3. The method according to claim 1 , wherein when the real-time control strategy is determined to be the pulse frequency modulation control strategy, controlling the switch tube based on the determined real-time control strategy comprises:
modulating a switch frequency of the switch tube to a reciprocal of the real-time closed-loop control output value; and
modulating a duty cycle of the switch tube to a first preset duty cycle.
4. The method according to claim 1 , wherein when the real-time control strategy is determined to be the pulse width modulation control strategy, controlling the switch tube based on the determined real-time control strategy comprises:
modulating a switch frequency of the switch tube to a reciprocal of the first preset value; and
modulating a duty cycle of the switch tube based on the real-time closed-loop control output value and the first preset value.
5. The control method according to claim 1 , wherein when the real-time control strategy is determined to be the pulse density modulation control strategy, controlling the switch tube based on the determined real-time control strategy comprises:
when the real-time closed-loop control output value is equal to the second preset value, modulating a switch frequency of the switch tube to a reciprocal of the first preset value, and modulating a duty cycle of the switch tube to a second preset duty cycle; and
when the real-time closed-loop control output value is less than the second preset value, modulating a duty cycle of the switch tube to 0.
6. The control method according to claim 1 , wherein when the converter is a phase-shifted full-bridge converter, determining the real-time control strategy of the switch tube from the plurality of the control strategies based on the real-time closed-loop control output value comprises:
when the real-time closed-loop control output value is less than a third preset value, determining the real-time control strategy as a pulse phase modulation control strategy;
when the real-time closed-loop control output value is greater than the third preset value, determining the real-time control strategy as the pulse width modulation control strategy; and
when the real-time closed-loop control output value and the third preset value satisfy a preset relationship, determining the real-time control strategy as the pulse density modulation control strategy.
7. The method according to claim 6 , wherein when the real-time control strategy is determined to be the pulse phase modulation control strategy, controlling the switch tube based on the determined real-time control strategy comprises:
adjusting a phase-shift angle of a pulse waveform between two legs of the phase-shifted full-bridge converter; and
modulating a duty cycle of the switch tube to a third preset duty cycle, and modulating a switch frequency of the switch tube to a preset frequency.
8. The method according to claim 6 , wherein when the real-time control strategy is determined to be the pulse width modulation control strategy, controlling the switch tube based on the determined real-time control strategy comprises:
adjusting a phase-shift angle of a pulse waveform between two legs of the phase-shifted full-bridge converter to the third preset value; and
modulating a duty cycle of the switch tube based on the third preset value and the real-time closed-loop control output value.
9. The method according to claim 6 , wherein when the real-time control strategy is determined to be the pulse density modulation control strategy, controlling the switch tube based on the determined real-time control strategy comprises:
adjusting a phase-shift angle of a pulse waveform between two legs of the phase-shifted full-bridge converter to the third preset value, and modulating a duty cycle of the switch tube to a fourth preset duty cycle; or
modulating a duty cycle of the switch tube to 0.
10. The method according to claim 1 , wherein controlling the switch tube based on the determined real-time control strategy comprises:
modulating a parameter of the switch tube based on the real-time control strategy;
wherein the parameter of the switch tube comprises at least one of:
a switch frequency,
a duty cycle, and
a phase-shift angle.
11. An apparatus for controlling a converter, wherein the converter comprises a switch tube, and the apparatus comprises:
a voltage censoring circuit, configured to obtain a real-time input voltage and a real-time output voltage of the converter; and
a control unit comprising a processor and a memory storing a program for execution by the processor, configured to:
determine a corresponding real-time closed-loop control output value of the converter based on the real-time input voltage and the real-time output voltage by using a closed-loop control algorithm;
determine a real-time control strategy of the switch tube from a plurality of control strategies based on the real-time closed-loop control output value; and
control the switch tube based on the determined real-time control strategy;
wherein when the converter is an isolated resonant direct current converter, in determining the real-time control strategy of the switch tube from the plurality of control strategies based on the real-time closed-loop control output value, the control unit is configured to:
when the real-time closed-loop control output value is greater than or equal to a first preset value, determine the real-time control strategy as a pulse frequency modulation control strategy;
when the real-time closed-loop control output value is less than the first preset value and greater than a second preset value, determine the real-time control strategy as a pulse width modulation control strategy, wherein the first preset value is greater than the second preset value; and
when the real-time closed-loop control output value is less than or equal to the second preset value, determine the real-time control strategy as a pulse density modulation control strategy.
12. The apparatus according to claim 11 , wherein the plurality of control strategies comprise at least three of:
a pulse frequency modulation control strategy,
a pulse width modulation control strategy,
a pulse density modulation control strategy, and
a pulse phase modulation control strategy.
13. The apparatus according to claim 11 , wherein when the real-time control strategy is determined to be the pulse frequency modulation control strategy, in controlling the switch tube based on the determined real-time control strategy, the control unit is configured to:
modulate a switch frequency of the switch tube to a reciprocal of the real-time closed-loop control output value; and
modulate a duty cycle of the switch tube to a first preset duty cycle.
14. The apparatus according to claim 11 , wherein when the converter is a phase-shifted full-bridge converter, in determining the real-time control strategy of the switch tube from the plurality of the control strategies based on the real-time closed-loop control output value, the control unit is configured to:
when the real-time closed-loop control output value is less than a third preset value, determine the real-time control strategy as a pulse phase modulation control strategy;
when the real-time closed-loop control output value is greater than the third preset value, determine the real-time control strategy as the pulse width modulation control strategy; and
when the real-time closed-loop control output value and the third preset value satisfy a preset relationship, determine the real-time control strategy as the pulse density modulation control strategy.
15. The apparatus according to claim 14 , wherein,
when the real-time control strategy is determined to be the pulse phase modulation control strategy, in determining a real-time control strategy of the switch tube from the plurality of the control strategies based on the real-time closed-loop control output value, the control unit is configured to:
adjust a phase-shift angle of a pulse waveform between two legs of the phase-shifted full-bridge converter; and
modulate a duty cycle of the switch tube to a third preset duty cycle, and modulate a switch frequency of the switch tube to a preset frequency;
when the real-time control strategy is determined to be the pulse width modulation control strategy, in determining a real-time control strategy of the switch tube from the plurality of the control strategies based on the real-time closed-loop control output value, the control unit is configured to:
adjust a phase-shift angle of a pulse waveform between two legs of the phase-shifted full-bridge converter to the third preset value; and
modulate a duty cycle of the switch tube based on the third preset value and the real-time closed-loop control output value;
when the real-time control strategy is determined to be the pulse density modulation control strategy, in determining a real-time control strategy of the switch tube from the plurality of the control strategies based on the real-time closed-loop control output value, the control unit is configured to:
adjust a phase-shift angle of a pulse waveform between two legs of the phase-shifted full-bridge converter to the third preset value, and modulate a duty cycle of the switch tube to a fourth preset duty cycle; or
modulate a duty cycle of the switch tube to 0.
16. The control apparatus according to claim 11 , wherein in controlling the switch tube based on the determined real-time control strategy, the control unit is configured to:
modulate a parameter of the switch tube based on the real-time control strategy;
wherein the parameter of the switch tube comprises at least one of:
a switch frequency,
a duty cycle, and
a phase-shift angle.
17. The apparatus according to claim 11 , wherein when the real-time control strategy is determined to be the pulse width modulation control strategy, in controlling the switch tube based on the determined real-time control strategy, the control unit is configured to:
modulate a switch frequency of the switch tube to a reciprocal of the first preset value; and
modulate a duty cycle of the switch tube based on the real-time closed-loop control output value and the first preset value.
18. The apparatus according to claim 11 , wherein when the real-time control strategy is determined to be the pulse density modulation control strategy, in controlling the switch tube based on the determined real-time control strategy, the control unit is configured to:
when the real-time closed-loop control output value is equal to the second preset value, modulate a switch frequency of the switch tube to a reciprocal of the first preset value, and modulate a duty cycle of the switch tube to a second preset duty cycle; and
when the real-time closed-loop control output value is less than the second preset value, modulate a duty cycle of the switch tube to 0.
19. A non-transitory computer readable storage medium configured to store a computer program, wherein when the computer program is executed by a processor of a controlling apparatus, the apparatus performs a process for controlling a converter that comprises:
obtaining a real-time input voltage and a real-time output voltage of the converter;
determining a corresponding real-time closed-loop control output value of the converter based on the real-time input voltage and the real-time output voltage by using a closed-loop control algorithm;
determining a real-time control strategy of a switch tube of the converter from a plurality of control strategies based on the real-time closed-loop control output value; and
controlling the switch tube based on the determined real-time control strategy;
wherein when the converter is an isolated resonant direct current converter, determining the real-time control strategy of the switch tube from the plurality of control strategies based on the real-time closed-loop control output value comprises:
when the real-time closed-loop control output value is greater than or equal to a first preset value, determining the real-time control strategy as a pulse frequency modulation control strategy;
when the real-time closed-loop control output value is less than the first preset value and greater than a second preset value, determining the real-time control strategy as a pulse width modulation control strategy, wherein the first preset value is greater than the second preset value; and
when the real-time closed-loop control output value is less than or equal to the second preset value, determining the real-time control strategy as a pulse density modulation control strategy.
20. The non-transitory computer readable storage medium according to claim 19 , wherein when the converter is a phase-shifted full-bridge converter, determining the real-time control strategy of the switch tube from the plurality of the control strategies based on the real-time closed-loop control output value comprises:
when the real-time closed-loop control output value is less than a third preset value, determining the real-time control strategy as a pulse phase modulation control strategy;
when the real-time closed-loop control output value is greater than the third preset value, determining the real-time control strategy as the pulse width modulation control strategy; and
when the real-time closed-loop control output value and the third preset value satisfy a preset relationship, determining the real-time control strategy as the pulse density modulation control strategy.