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US 9,240,735 B2Granted
Standby power reduction device
AssigneeKorchip Corporation
InventorsSoon Joo Choi, Jin Hyoung Son
Life of this patent
Estimating the term…
Abstract
A standby power reduction device is provided, including a capacitor connected in parallel to a main switch controlling a switching mode power supply, without the necessity of providing a starting circuit, thereby reducing the cost and enabling miniaturization of product.
Claims20
A standby power reduction device comprising:
- a switching mode power supply (SMPS) receiving a power voltage rectified from AC power and generating a first output voltage and a second output voltage;
- a voltage-dividing circuit electrically connected to the SMPS, receiving the second output voltage and generating a divided voltage;
- a control circuit electrically connected to the voltage-dividing circuit, operated by the divided voltage and including a control transistor;
- a charging circuit electrically connected to the control circuit, operated by the control circuit and including a booster transistor;
- an electric double layer capacitor (EDLC) electrically connected to the charging circuit and charging electric energy by the charging circuit;
- a voltage detector connected in parallel to the EDLC and detecting a charge voltage of the EDLC;
- a control switch electrically connected to the control circuit, operated by the control circuit and including a first switching transistor;
- a main switch operated by the control switch, controlling the operation of the SMPS and including a second switching transistor and a wired OR circuit;
- a photo-coupler controlling the operation of the main switch according to a command of a device operated by a first output voltage;
- and
- a first capacitor connected in parallel to the second switching transistor of the main switch,
- wherein the first capacitor operates the SMPS using a current flowing in the first capacitor when an electronic device is connected to the AC power for the first time.
9 more elements
A standby power reduction device comprising:
- a switching mode power supply (SMPS) receiving a power voltage rectified from AC power and generating a first output voltage and a second output voltage;
- a voltage-dividing circuit electrically connected to the SMPS, receiving the second output voltage and generating a divided voltage;
- a control circuit electrically connected to the voltage-dividing circuit, operated by the divided voltage and including a control transistor;
- a charging circuit electrically connected to the control circuit, operated by the control circuit and including a booster transistor;
- an electric double layer capacitor (EDLC) electrically connected to the charging circuit and charging electric energy by the charging circuit;
- a voltage detector connected in parallel to the EDLC and detecting a charge voltage of the EDLC;
- a control switch electrically connected to the control circuit, operated by the control circuit and including a first switching transistor;
- a main switch operated by the control switch, controlling the operation of the SMPS and including a second switching transistor and a wired OR circuit;
- a photo-coupler controlling the operation of the main switch according to a command of a device operated by a first output voltage;
- and
- a time constant circuit electrically connected between an input terminal of the SMPS and the main switch,
- wherein the time constant circuit operates the SMPS using a current flowing in the time constant circuit when an electronic device is connected to the AC power for the first time.
9 more elements
Dependencies are inferred from the claim text.