The pulse width modulation control method and RF band power supply device according to the present invention are a pulse width modulation (PWM) control of a single phase PWM inverter in which the modulated wave frequency fs of a modulated wave is set in the RF band. The present control includes each of (a) a frequency synchronization control in which the carrier wave frequency fc of the carrier wave is set to even N times the modulated wave frequency fs, (b) an odd function control in which the modulated wave is set to a sine wave of an odd function and the carrier wave is set to a triangle wave of an odd function, and (c) a phase synchronization control in which the carrier wave is synchronized in phase with the modulated wave in each cycle of the modulated wave.

The pulse width modulation control method and RF band power supply device according to the present invention are a pulse width modulation (PWM) control of a single phase PWM inverter in which the modulated wave frequency fs of a modulated wave is set in the RF band. The present control includes each of (a) a frequency synchronization control in which the carrier wave frequency fc of the carrier wave is set to even N times the modulated wave frequency fs, (b) an odd function control in which the modulated wave is set to a sine wave of an odd function and the carrier wave is set to a triangle wave of an odd function, and (c) a phase synchronization control in which the carrier wave is synchronized in phase with the modulated wave in each cycle of the modulated wave.

A power supply circuit comprises control signal circuitry comprising power control command generation means for receiving or generating a power supply command and for generating internal switching control signals according to the power supply command for controlling power supply, and a first galvanic separation stage receiving at its input the internal switching control signals and producing at its separation output output control signals. It also comprises power control circuitry with power input terminals connectable to an input power supply, a signal input connected to said separation output, a semiconductor power switch for switching on and off power drawn from said power input terminals in accordance with the output control signal from said signal input, a first transformer comprising a first primary winding connected to said semiconductor power switch and to one of said power input terminals and a first secondary winding inductively coupled with said first primary winding, and a power output circuit connected to said first secondary winding and having power output terminals for supplying controlled supply power.

A power supply circuit comprises control signal circuitry comprising power control command generation means for receiving or generating a power supply command and for generating internal switching control signals according to the power supply command for controlling power supply, and a first galvanic separation stage receiving at its input the internal switching control signals and producing at its separation output output control signals. It also comprises power control circuitry with power input terminals connectable to an input power supply, a signal input connected to said separation output, a semiconductor power switch for switching on and off power drawn from said power input terminals in accordance with the output control signal from said signal input, a first transformer comprising a first primary winding connected to said semiconductor power switch and to one of said power input terminals and a first secondary winding inductively coupled with said first primary winding, and a power output circuit connected to said first secondary winding and having power output terminals for supplying controlled supply power.

This application discloses an electrical system and an electrical apparatus. The electrical system includes: a first-stage conversion module including a plurality of first controllable switches; a second-stage conversion module including a plurality of second controllable switches; a first digital signal processor configured to control the first controllable switch; and a second digital signal processor configured to control the second controllable switch, where a first output crossbar switch of the first digital signal processor is configured to supply a first internal signal to a first output port, so that the second digital signal processor receives the first internal signal within a preset time through a second input port. The internal signal of the first digital signal processor can be enabled to be transmitted to the second digital signal processor within a relatively short time, thereby reducing a time interval for triggering a protection action between the two digital signal processors.

In described examples, a resonant converter includes a primary side, a secondary side, and a controller. The primary side includes a primary full bridge coupled to a primary winding. The primary full bridge includes first and second high-side primary switches and first and second low-side primary switches. The secondary side includes a secondary full bridge coupled to a secondary winding. The secondary full bridge includes two high-side secondary switches and two low-side secondary switches. The controller operates the resonant converter in a phase shift mode with an overlapping phase and a non-overlapping phase. In the overlapping phase the first high-side primary switch and the first low-side primary switch are closed. In the non-overlapping phase either the first high-side primary switch or the first low-side primary switch is closed and the other is open. The controller closes either the two high-side or the two low-side secondary switches during the non-overlapping phase.

In described examples, a resonant converter includes a primary side, a secondary side, and a controller. The primary side includes a primary full bridge coupled to a primary winding. The primary full bridge includes first and second high-side primary switches and first and second low-side primary switches. The secondary side includes a secondary full bridge coupled to a secondary winding. The secondary full bridge includes two high-side secondary switches and two low-side secondary switches. The controller operates the resonant converter in a phase shift mode with an overlapping phase and a non-overlapping phase. In the overlapping phase the first high-side primary switch and the first low-side primary switch are closed. In the non-overlapping phase either the first high-side primary switch or the first low-side primary switch is closed and the other is open. The controller closes either the two high-side or the two low-side secondary switches during the non-overlapping phase.