Control circuit and switching power supply unit
First Claim
1. A control circuit that controls a switching element in a switching power supply unit, the control circuit comprising:
- a controller connected to the switching element;
a signal generating circuit connected to an input part provided for the controller;
a reference voltage source connected to the signal generating circuit; and
a comparator having a first input terminal to which an output voltage is input from the switching power supply unit, a second input terminal to which a comparison signal is input from the signal generating circuit, and an output terminal connected to the signal generating circuit and to the input part provided for the controller;
whereinthe comparison signal is created according to an output signal from the comparator and to a reference voltage of the reference voltage source,the comparison signal is raised when the output signal from the comparator is switched from a second level to a first level,the comparison signal is lowered with a first inclination during a period in which the output signal from the comparator is at the first level,the comparison signal is further lowered when the output signal from the comparator is switched from the first level to the second level, andthe comparison signal is raised with a second inclination during a period in which the output signal from the comparator is at the second level.
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Accused Products
Abstract
A control circuit controls a switching element in a switching power supply unit. The control circuit includes: a controller connected to the switching element; a signal generating circuit connected to the input part of the controller; a reference voltage source connected to the signal generating circuit; and a comparator having a first input terminal to which an output voltage is input from the switching power supply unit, a second input terminal to which a comparison signal is input from the signal generating circuit, and an output terminal connected to the signal generating circuit and to the input part of the controller.
18 Citations
20 Claims
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1. A control circuit that controls a switching element in a switching power supply unit, the control circuit comprising:
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a controller connected to the switching element; a signal generating circuit connected to an input part provided for the controller; a reference voltage source connected to the signal generating circuit; and a comparator having a first input terminal to which an output voltage is input from the switching power supply unit, a second input terminal to which a comparison signal is input from the signal generating circuit, and an output terminal connected to the signal generating circuit and to the input part provided for the controller;
whereinthe comparison signal is created according to an output signal from the comparator and to a reference voltage of the reference voltage source, the comparison signal is raised when the output signal from the comparator is switched from a second level to a first level, the comparison signal is lowered with a first inclination during a period in which the output signal from the comparator is at the first level, the comparison signal is further lowered when the output signal from the comparator is switched from the first level to the second level, and the comparison signal is raised with a second inclination during a period in which the output signal from the comparator is at the second level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19)
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12. A control circuit that controls a switching element in a switching power supply unit, the control circuit comprising:
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a controller connected to the switching element; a signal generating circuit; and a comparator having a first input terminal to which an output voltage is input from the switching power supply unit, a second input terminal to which a comparison signal is input from the signal generating circuit, and an output terminal connected to an input part provided for the controller;
whereinthe signal generating circuit has a first input terminal to which a signal is input according to an output signal output from the output terminal of the comparator and also has a second input terminal to which a reference voltage is input from a reference voltage source, the comparison signal is created according to a signal based on the output signal output from the output terminal of the comparator and to the reference voltage of the reference voltage source, the comparison signal is raised when the signal based on the output signal output from the output terminal of the comparator is switched from a second level to a first level, the comparison signal is lowered with a first inclination during a period in which the signal based on the output signal output from the output terminal of the comparator is at the first level, the comparison signal is further lowered when the signal based on the output signal output from the output terminal of the comparator is switched from the first level to the second level, and the comparison signal is raised with a second inclination during a period in which the signal based on the output signal output from the output terminal of the comparator is at the second level. - View Dependent Claims (20)
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Specification