Patent ID: 8633772

Claim:
A power conversion circuit for converting a voltage of a power source to a positive voltage and a negative voltage to power a power amplifier, the power conversion circuit comprising: a path switch, electrically connected between a power port and the power amplifier, the power port connected to the power source; a feedback module, connected to a positive voltage input port of the power amplifier, configured to obtain the voltage of the positive voltage input port and produce a feedback signal reflecting the voltage of the positive voltage input port of the power amplifier; a pulse width modulator, connected to the path switch and the feedback module, configured to receive the feedback signal from the feedback module, and produce a pulse signal with a corresponding duty cycle according to the received feedback signal, and output the pulse signal to the path switch to cause the path switch to turn on or off alternately, then convert the voltage of the power source to a switching power supply signal; a rectifier module, connected between the path switch and the positive voltage input port of the power amplifier, configured to convert the switching power supply signal to a direct current signal with a suitable positive voltage and provide the suitable positive voltage to the positive voltage input port of the power amplifier; a negative voltage producing module, electrically connected between the path switch and a negative voltage input port of the power amplifier, configured to produce a first negative voltage when the path switch is turned on, and produce a second negative voltage when the path switch is turned off; and a voltage regulating module; connected between the negative voltage producing module and the negative voltage input port of the power amplifier, configured to regulate the first negative voltage and the second negative voltage to a suitable negative voltage and provide the suitable negative voltage to the negative voltage input port of the power amplifier.