Power supply apparatus
First Claim
1. A power supply apparatus comprising:
- a switching means for relaying electrical current to be supplied to a transformer and a digital signal processor (DSP) means for controlling an operation of said switching means, wherein said DSP means memorizes a plurality of pulse patterns for controlling an operation of said switching means continuously or intermittently and wherein said DSP selects a suitable pulse pattern for driving said switching means from the memorized patterns in accordance with an amount of load current and wherein the switching means is driven in accordance with the thus selected pulse pattern.
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Abstract
A power supply apparatus includes a switching element for relaying electrical current to be supplied to a transformer and a controlling circuit for controlling an operation of said switching element. The controlling circuit has a first oscillator which works to continuously drive the switching element and a second oscillator which works to intermittently operate the switching element. An amount of electrical current to be supplied to the transformer is controlled by changing a duty cycle or an oscillating period of the second oscillator in accordance with a variation of the amount of load current. Further, an initiating resistance for initiating the controlling circuit and a "cut-off" circuit cutting the resistance off: it is arranged such that the resistance is "cut-off" from the controlling circuit after initiating the controlling circuit in order to avoid that a significant amount of current is consumed at the resistance after initiating the circuit.
51 Citations
6 Claims
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1. A power supply apparatus comprising:
- a switching means for relaying electrical current to be supplied to a transformer and a digital signal processor (DSP) means for controlling an operation of said switching means, wherein said DSP means memorizes a plurality of pulse patterns for controlling an operation of said switching means continuously or intermittently and wherein said DSP selects a suitable pulse pattern for driving said switching means from the memorized patterns in accordance with an amount of load current and wherein the switching means is driven in accordance with the thus selected pulse pattern.
- View Dependent Claims (2, 3, 4, 5)
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6. A power supply apparatus comprising:
- a switching means for relaying electrical current to be supplied to a transformer and a digital signal processor (DSP) means for controlling an operation of said switching means, wherein said DSP means previously memorizes an algorithm for computing a suitable pulse pattern for driving said switching means continuously or intermittently, and wherein said DSP computes the suitable pulse pattern for driving said switching means using the memorized algorithm in accordance with an amount of load current and wherein the switching means is driven in accordance with the thus computed pulse pattern.
Specification