Self-discharge control for an emi filter capacitor
AssigneeRichtek Technology Corporation
InventorsYen-Te LEE, Kuo-Chi LIU, Wen-Wei CHEN, Yi-Fan CHEN, Kuang-Feng LI
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Abstract
An independent bleeding integrated circuit device is provided to replace the bleeding resistor for an EMI filter capacitor, to establish a discharge path between the two terminals of the EMI filter capacitor when the EMI filter capacitor is disconnected from an AC power source, for discharging the EMI filter capacitor. When the EMI filter capacitor is connected with an AC power source, the discharge path is cut off to avoid power loss.
Claims45
A self-discharge bleeding circuit connected between two terminals of an EMI filter capacitor, comprising:
- a bleeding switch connected between the two terminals of the EMI filter capacitor;
- and
- a controller connected to the bleeding switch, configured to turn on the bleeding switch when a time that a voltage of the EMI filter capacitor has continuously exceeded a threshold value reaches a threshold time, to thereby establish a discharge path between the two terminals of the EMI filter capacitor for the EMI filter capacitor to discharge through the discharge path.
An independent bleeding integrated circuit device connected between two terminals of an EMI filter capacitor, comprising:
- a first pin and a second pin connected to the two terminals of the EMI filter capacitor, respectively;
- a bleeding switch connected between the first pin and the second pin;
- and
- a controller connected to the bleeding switch, configured to turn on the bleeding switch when a time that a voltage of the EMI filter capacitor has continuously exceeded a threshold value reaches a threshold time, to thereby establish a discharge path between the two terminals of the EMI filter capacitor for the EMI filter capacitor to discharge through the discharge path.
A bleeding method for an EMI filter capacitor connected between two AC power input terminals, comprising:
- A.) connecting a bleeding switch between the two AC power input terminals, wherein the bleeding switch is open circuit when the two AC power input terminals are connected to an AC power source;
- and
- B.) turning on the bleeding switch when a time that a voltage of the EMI filter capacitor has continuously exceeded a threshold value reaches a threshold time, for establishing a discharge path between two terminals of the EMI filter capacitor for the EMI filter capacitor to discharge through the discharge path.
An AC/DC power interface connected between two AC power input terminals, comprising:
- an external bridge rectifier having two input terminals connected to the two AC power input terminals, respectively;
- an EMI filter capacitor connected between the two AC power input terminals;
- a bleeding switch connected between the two terminals of the EMI filter capacitor;
- and
- a controller connected to the bleeding switch, configured to turn on the bleeding switch when a time that a voltage of the EMI filter capacitor has continuously exceeded a threshold value reaches a threshold time, to thereby establish a discharge path between the two terminals of the EMI filter capacitor for the EMI filter capacitor to discharge through the discharge path.
Dependencies are inferred from the claim text.