Resonance type switching power supply unit
First Claim
1. A resonance type switching power supply unit having a switching circuit for carrying out a switching operation on an inputted direct current, a converter transformer supplied with a switched output from the switching circuit, a resonator including a coil of said converter transformer as a resonator element, a rectifier for rectifying an output of said converter transformer and supplying a rectified output to a load connected to said resonance type switching power supply unit, and a switching controller for controlling a switching frequency of said switching circuit depending on the rectified output deriving from said rectifier, said converter transformer being arranged as one capable of varying a leakage inductance thereof, and said resonance type switching power supply unit comprising:
- a detector for detecting an input voltage applied to said switching circuit and an output current supplied from said rectifier to the load; and
a leakage inductance controller for variably controlling the leakage inductance of said converter transformer.
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Abstract
An object of the present invention is to create the optimum resonating condition to constantly decrease switching losses. A converter transformer capable of varying the leakage inductance is employed as a converter transformer, and a control circuit is arranged to detect an input voltage applied to a switching circuit and a voltage drop brought about in a current detecting resistor which allows a load current to flow. Thus, the leakage inductance of the converter transformer can be controlled.
59 Citations
13 Claims
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1. A resonance type switching power supply unit having a switching circuit for carrying out a switching operation on an inputted direct current, a converter transformer supplied with a switched output from the switching circuit, a resonator including a coil of said converter transformer as a resonator element, a rectifier for rectifying an output of said converter transformer and supplying a rectified output to a load connected to said resonance type switching power supply unit, and a switching controller for controlling a switching frequency of said switching circuit depending on the rectified output deriving from said rectifier, said converter transformer being arranged as one capable of varying a leakage inductance thereof, and said resonance type switching power supply unit comprising:
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a detector for detecting an input voltage applied to said switching circuit and an output current supplied from said rectifier to the load; and
a leakage inductance controller for variably controlling the leakage inductance of said converter transformer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification