Patent ID: 7385313
Filing Date: 2008-06-10
Classification: G06F

Abstract:
1. A controller for on-off switching of one or more power supplies, comprising: a microprocessor; a power supply interface and reset circuit connected to the microprocessor; a communication interface connected to the microprocessor, for converting voltage signals between the microprocessor and an outside communication interface; an on-off control circuit which is connected to the microprocessor, comprising a first transistor, a second transistor, a first relay, and a second relay, the first and second transistors forming a two-level amplifying circuit, the base of the second transistor connected to the microprocessor via a first resistor, the emitters of the first and second transistors connected to ground, the base of the first transistor and the collector of the second transistor connected to a first input of the first and second relays via a second resistor, the collector of the first transistor connected to a second input of the first and second relays, the first input of the first and second relays also connected to a voltage source, an output of the first relay connected to a first valve and a second valve, while an output of the second relay connected to a third valve and a fourth valve, one or more pieces of electrical equipment connected to an AC supply via the first and second relays; a feedback portion connected between the microprocessor and the first, second, third, and forth valves of the on-off control circuit, for feeding on-off states of the power supplies to the microprocessor; a memory connected to the microprocessor, for storing the data processed by the microprocessor; and a voltage converter for providing steady voltage to the power supply interface and reset circuit, the communication interface, and the on-off control circuit.