SWITCH CONTROL CIRCUIT, SWITCH CONTROLLING METHOD, AND POWER SUPPLY DEVICE USING THE SWITCH CONTROL CIRCUIT
First Claim
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1. A power supply device comprising:
- a DC-link wire connected between a full-wave rectification voltage and a first output terminal and having a protection switch formed therein;
an inductor charging power using the full-wave rectification voltage and supplying the power to a load connected between the first output terminal and a second output terminal;
a power switch connected to the inductor and controlling power supplied to the load; and
a switch control circuit generating a reference signal according to the full-wave rectification signal, controlling a switching operation of the power switch according to a result of comparison between a sense voltage corresponding to a current flowing to the power switch and the reference voltage, determining whether an open line between the first output terminal and the second output terminal using the sense voltage, and turning off the protection switch when the line open is generated.
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Abstract
Embodiments of the present invention relate to a switch control circuit, a switch control method, and a power supply device using the same.
Embodiments generate a reference signal according to a full-wave rectification voltage and control a switching operation of a power switch according to a comparing result of a sense voltage corresponding to a current flowing to the power switch and the reference voltage. Embodiments determine whether a line is opened between a first output terminal and a second output terminal of the power supply device using the sense voltage. When the line is opened, Embodiments turn off the protection switch.
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Citations
20 Claims
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1. A power supply device comprising:
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a DC-link wire connected between a full-wave rectification voltage and a first output terminal and having a protection switch formed therein; an inductor charging power using the full-wave rectification voltage and supplying the power to a load connected between the first output terminal and a second output terminal; a power switch connected to the inductor and controlling power supplied to the load; and a switch control circuit generating a reference signal according to the full-wave rectification signal, controlling a switching operation of the power switch according to a result of comparison between a sense voltage corresponding to a current flowing to the power switch and the reference voltage, determining whether an open line between the first output terminal and the second output terminal using the sense voltage, and turning off the protection switch when the line open is generated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A switch control circuit controlling operation of a protection switch connected between a full-wave rectification voltage rectified from an AC input and a first output terminal and controlling a switching operation of a power switch that controls power supplied to a load connected between the first output terminal and a second output terminal through an inductor charged with power by the full-wave rectification voltage, the switch control circuit comprising:
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a reference signal generator generating a reference signal according to the full-wave rectification voltage; a PWM controller controlling the switching operation of the power switch according to a comparison result between a sense voltage corresponding to a current flowing to the power switch with the reference signal; and an open protection operator determining whether a line between the first output terminal and the second output terminal is opened using the sense voltage and turning off the protection switch when the line open occurs. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A switch control method for controlling a switching operation of a power switch that controls an operation of a protection switch connected between a full-wave rectification voltage rectified from an AC input and a first output terminal and controls a switching operation of a power switch that controls power supplied to a load connected between the first output terminal and a second output terminal through an inductor charged with power by the full-wave rectification voltage, the switch control method comprising:
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generating a reference signal according to the full-wave rectification voltage; controlling the switching operation of the power switch according to the comparison result between a sense voltage corresponding to a current flowing to the power switch with the reference signal; and determining whether a line between the first output terminal and the second output terminal is opened using the sense voltage, and turning off the protection switch controlling the open protection operation when the line open occurs. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification