Power source
First Claim
1. A power source for driving an electrical device comprising:
- a DC supply providing a rectified and smoothed DC voltage from an AC power supply;
a self-excited oscillator comprising an FET transistor energized by said DC power supply to generate a high frequency voltage; and
a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage,wherein said self-excited oscillator comprises a Class-C amplifier and includes a bias stabilizing circuit comprising a diode and a resistor connected in series between a first end of a feedback winding of said transformer and a drain terminal of said FET transistor, wherein a second end of said feedback winding is connected to a gate terminal of said FET transistor, wherein said bias stabilizing circuit provides a stabilized bias to said Class-C amplifier for assuring constant Class-C operation at an optimum efficiency.
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Abstract
A power source driving an electrical device includes a DC power supply providing a rectified and smoothed DC voltage from an AC main power, a self-oscillator energized by the DC power supply to generate a high frequency voltage, and a transformer which provides an output voltage from the high frequency voltage for driving a load circuit of the device. The characterizing feature of the power source resides in that the self-oscillator comprises a class C amplifier and includes a bias stabilizing circuit which provides a stabilized bias to the class C amplifier for assuring constant and optimum operation irrespective of possible variations in the supply voltage as well as load variations.
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Citations
20 Claims
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1. A power source for driving an electrical device comprising:
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a DC supply providing a rectified and smoothed DC voltage from an AC power supply; a self-excited oscillator comprising an FET transistor energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a bias stabilizing circuit comprising a diode and a resistor connected in series between a first end of a feedback winding of said transformer and a drain terminal of said FET transistor, wherein a second end of said feedback winding is connected to a gate terminal of said FET transistor, wherein said bias stabilizing circuit provides a stabilized bias to said Class-C amplifier for assuring constant Class-C operation at an optimum efficiency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power source for driving an electrical device, comprising:
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a DC power supply providing a rectified and smoothed DC voltage from an AC power source; a self-excited oscillator energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a capacitor providing a bias voltage in a bias stabilizing circuit, which provides a stabilized bias to said Class-C amplifier for assuring constant Class-C operation at an optimum efficiency. - View Dependent Claims (8, 9, 10, 11)
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12. A power source for driving an electrical device, comprising:
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a DC power supply providing a rectified and smoothed DC voltage from an AC power source; a self-excited oscillator comprising an amplifier element energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a bias stabilization circuit comprising a resistor and a diode connected in series between one end of a feedback winding of said transformer and an output end of said amplifier element in order to provide a stabilized bias voltage for Class-C amplification. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification