Switching power supply circuit
First Claim
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1. A switching power supply circuit of current resonance type comprising:
- a switching element;
an LC resonance circuit to resonate current flowing through the switching element; and
a detection circuit to perform a detection associated with an output current amount of the switching power supply circuit;
wherein the detection circuit comprises;
an operation detection circuit to detect an operating timing of the switching element;
a voltage detection circuit to detect a voltage under resonating operation of the LC resonance circuit; and
a current value pulse generating circuit to generate a current value pulse, which becomes high during a time from when a detection signal of the operation detection circuit is output until a time when a detection signal of the voltage detection circuit is output, and to output the current value pulse as the output current amount.
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Abstract
Disclosed a switching power supply circuit of current resonance type including: a switching element; an LC resonance circuit to resonate current flowing through the switching element; and a detection circuit to perform a detection associated with an output current amount on the basis of an operation timing of the switching element and a voltage under resonating operation of the LC resonance circuit.
6 Citations
11 Claims
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1. A switching power supply circuit of current resonance type comprising:
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a switching element; an LC resonance circuit to resonate current flowing through the switching element; and a detection circuit to perform a detection associated with an output current amount of the switching power supply circuit; wherein the detection circuit comprises; an operation detection circuit to detect an operating timing of the switching element; a voltage detection circuit to detect a voltage under resonating operation of the LC resonance circuit; and a current value pulse generating circuit to generate a current value pulse, which becomes high during a time from when a detection signal of the operation detection circuit is output until a time when a detection signal of the voltage detection circuit is output, and to output the current value pulse as the output current amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification