Self oscillation circuits
First Claim
1. A self oscillation circuit for use as a converter to convert a DC power source to AC power source, which circuit comprises a DC power source input unit, an output transformer, an LC primary side resonance circuit formed at primary side of an input of the output transformer, and a switching circuit that turns on and off the DC voltage and being provided with a drive circuit that turns the switching circuit on and off on the basis of a feedback signal of the primary side resonance voltage induced in the LC primary side resonance circuit and converts the energizing direction of the DC power source to the output transformer in clockwise and counter-clockwise direction to drive the output transformer, a phase detecting means for detecting the phase signal of a resonance waveform at the primary side of the output transformer and outputting the phase signal, and a control circuit for outputting the phase signal as the drive signal that controls the on-off of the switching circuit.
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Abstract
An object of the present invention is to provide a small size output transformer capable of producing sine wave oscillation at stability and high efficiency. A drive circuit including a switching circuit is connected to DC power source input units 12a, 12b, and an output transformer 10 is connected to the drive circuit. At the drive circuit, the switching circuit is turned on and off on the basis of a feedback signal of the primary side resonance voltage induced in the input side primary winding of the output transformer. The energizing direction of the DC power source to the output transformer is converted in clockwise and counter-clockwise direction by the on and off of the switching circuit, and the power source is applied as the AC signal to the input side primary winding of the output transformer. The phase detecting means detects the phase of the resonance waveform at the primary side of the output transformer 10 and outputs the phase signal. The control circuit connected to the drive circuit converts the signal of the phase detecting means to two phase signals of mutually reversal phases and outputs the drive signal for the on-off control of the switching circuit of the drive circuit.
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Citations
6 Claims
- 1. A self oscillation circuit for use as a converter to convert a DC power source to AC power source, which circuit comprises a DC power source input unit, an output transformer, an LC primary side resonance circuit formed at primary side of an input of the output transformer, and a switching circuit that turns on and off the DC voltage and being provided with a drive circuit that turns the switching circuit on and off on the basis of a feedback signal of the primary side resonance voltage induced in the LC primary side resonance circuit and converts the energizing direction of the DC power source to the output transformer in clockwise and counter-clockwise direction to drive the output transformer, a phase detecting means for detecting the phase signal of a resonance waveform at the primary side of the output transformer and outputting the phase signal, and a control circuit for outputting the phase signal as the drive signal that controls the on-off of the switching circuit.
Specification