Power supply circuit
First Claim
1. A power supply circuit for receiving an input voltage at an input terminal, converting the input voltage to an output voltage and outputting the output voltage to a load connected to an output terminal, comprising:
- a power supply circuit unit for converting the input voltage to a predetermined constant voltage and outputting the converted voltage to the output terminal, the power supply circuit unit operating in accordance with a first control signal;
an output current detecting circuit unit for detecting a current output from the power supply circuit unit, and outputting a second control signal when the detected current is smaller than a predetermined value i1; and
an output voltage detecting circuit unit for detecting a voltage output from the power supply circuit unit, and operating while the output current detecting circuit unit outputs the second control signal, the output voltage detecting circuit unit stopping operation of the power supply circuit unit with the first control signal when the detected voltage exceeds a predetermined value Vdet1;
whereby the output supply voltage detecting circuit unit causes the power supply circuit unit to operate when the detected voltage becomes equal to or lower than a predetermined value Vdet2 that is lower than the predetermined value Vdet1, thereby the power supply circuit unit performs intermittent operations.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a power supply circuit that can intermittently operate when its load is small and therefore can reduce current consumption at a sleep mode. The power supply circuit for receiving an input voltage at an input terminal, converting the input voltage to an output voltage and outputting the output voltage to a load connected to an output terminal, comprises: a power supply circuit unit; an output current detecting circuit unit; and an output voltage detecting circuit unit; whereby the output supply voltage detecting circuit unit makes the power supply circuit unit operate when the detected voltage becomes equal to or lower than a predetermined value, and thereby the power supply circuit unit performs intermittent operations.
8 Citations
14 Claims
-
1. A power supply circuit for receiving an input voltage at an input terminal, converting the input voltage to an output voltage and outputting the output voltage to a load connected to an output terminal, comprising:
-
a power supply circuit unit for converting the input voltage to a predetermined constant voltage and outputting the converted voltage to the output terminal, the power supply circuit unit operating in accordance with a first control signal;
an output current detecting circuit unit for detecting a current output from the power supply circuit unit, and outputting a second control signal when the detected current is smaller than a predetermined value i1; and
an output voltage detecting circuit unit for detecting a voltage output from the power supply circuit unit, and operating while the output current detecting circuit unit outputs the second control signal, the output voltage detecting circuit unit stopping operation of the power supply circuit unit with the first control signal when the detected voltage exceeds a predetermined value Vdet1;
whereby the output supply voltage detecting circuit unit causes the power supply circuit unit to operate when the detected voltage becomes equal to or lower than a predetermined value Vdet2 that is lower than the predetermined value Vdet1, thereby the power supply circuit unit performs intermittent operations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification