Microwave generator with power factor correction function and control method thereof

A microwave generator, comprising:

• a power supply for converting an input voltage and an input current into an output voltage and an output current;
• an output circuit connected with an output terminal of the microwave generator, wherein the output circuit generates a microwave signal to the output terminal and generates a feedback signal according to the microwave signal;
• a feedback oscillator electrically connected with the output circuit, wherein the feedback oscillator generates an oscillation signal according to the feedback signal;
• a pulse controller for receiving a reference signal related to the input voltage and/or harmonics of the input voltage and generating a pulse signal, wherein the pulse controller comprises:
• a triangular wave generator for generating a triangular wave signal;
• and
• a comparator, wherein a first input terminal of the comparator receives the reference signal, a second input terminal of the comparator is electrically connected with the triangular wave generator to receive the triangular wave signal, and an output terminal of the comparator is electrically connected with a semiconductor amplifier;
• wherein the comparator generates the pulse signal to the semiconductor amplifier according to a result of comparing the reference signal and the triangular wave signal;
• a signal combination circuit for combining the oscillation signal with the pulse signal to generate a control signal;
• and
• wherein the semiconductor amplifier is electrically connected with the power supply, the signal combination circuit and the output circuit, wherein the semiconductor amplifier receives the output voltage and the output current, generates and adjusts an amplified signal according to the control signal, wherein the output circuit generates the microwave signal according to the amplified signal, and the output current is adjusted according to the amplified signal, so that the input current and the input voltage are in phase.

A microwave generator, comprising:

• a power supply for converting an input voltage and an input current into an output voltage and an output current;
• an output circuit connected with an output terminal of the microwave generator, wherein the output circuit generates a microwave signal to the output terminal and generates a feedback signal according to the microwave signal;
• a feedback oscillator electrically connected with the output circuit, wherein the feedback oscillator generates an oscillation signal according to the feedback signal;
• a splitter electrically connected with the feedback oscillator for splitting the oscillation signal into plural segmented oscillation signals;
• a pulse controller for receiving a reference signal related to the input voltage and/or harmonics of the input voltage and generating a pulse signal;
• plural signal combination:
• circuits for combining the corresponding segmented oscillation signal with the pulse signal to generate corresponding control signals;
• and
• plural semiconductor amplifiers electrically connected with the power supply, the corresponding signal combination circuits and the output circuit, wherein each semiconductor amplifier receives the output voltage and the output current, generates and adjusts a respective amplified signal according to the respective control signal, wherein the output circuit generates the microwave signal according to the respective amplified signals outputted from the plural semiconductor amplifiers, and the output current is adjusted according to the amplified signals outputted from the plural semiconductor amplifiers, so that the input current and the input voltage are in phase.