POWER SUPPLY DEVICE AND METHOD FOR CONTROLLING SAME
First Claim
1. A power supply device that can be switched to a normal operation for supplying electric power to a circuit connected to said power supply device by an instruction issued by an instructor that operates with electric power from said power supply device and a standby operation for not supplying electric power to the circuit connected to said power supply device, comprising:
- a voltage generator that generates a DC voltage;
a first switch;
a voltage converter that is connected to said voltage generator via said first switch, and converts the DC voltage generated by said voltage generator into a DC voltage for supplying electric power to the circuit connected to said power supply device and said instructor;
a second switch;
a control circuit that is operable to control an opening and closing operation of said first switch by receiving an output voltage of said voltage converter as a power supply voltage via said second switch; and
a switch controller that closes said second switch in said normal operation, and opens said second switch when a first period has elapsed since said instructor issued an instruction to perform said standby operation.
1 Assignment
0 Petitions
Accused Products
Abstract
In a normal operation, a switch control circuit in a control IC for switching power supply operates to control an opening and closing operation of a switching element. When a remote control receiving circuit issues an instruction to perform a standby operation, an energy saving switch is opened in a period elapsed until an output voltage of a rectification/smoothing circuit for secondary output winding falls below a predetermined value. Thus, an operation of a switch control circuit in the control IC for switching power supply is stopped such that the opening and closing operation of the switching element is not performed. In this case, the remote control receiving circuit and a timer microcomputer are operable with electric power based on a voltage at a smoothing capacitor in the rectification/smoothing circuit for secondary output winding.
19 Citations
14 Claims
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1. A power supply device that can be switched to a normal operation for supplying electric power to a circuit connected to said power supply device by an instruction issued by an instructor that operates with electric power from said power supply device and a standby operation for not supplying electric power to the circuit connected to said power supply device, comprising:
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a voltage generator that generates a DC voltage; a first switch; a voltage converter that is connected to said voltage generator via said first switch, and converts the DC voltage generated by said voltage generator into a DC voltage for supplying electric power to the circuit connected to said power supply device and said instructor; a second switch; a control circuit that is operable to control an opening and closing operation of said first switch by receiving an output voltage of said voltage converter as a power supply voltage via said second switch; and a switch controller that closes said second switch in said normal operation, and opens said second switch when a first period has elapsed since said instructor issued an instruction to perform said standby operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A power supply device that can be switched to a normal operation for supplying electric power to a circuit connected to said power supply device by an instruction issued by an instructor that operates with electric power from said power supply device and a standby operation for not supplying electric power to the circuit connected to said power supply device, comprising:
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a voltage generator that generates a DC voltage; a voltage converter that is connected to said voltage generator, and converts the DC voltage generated by said voltage generator into a DC voltage for supplying electric power to the circuit connected to said power supply device and said instructor; and a control circuit that controls said voltage converter such that an output voltage of said voltage converter has a first value in said normal operation, and controls said voltage converter such that an output voltage of said voltage converter falls to a second value lower than said first value when said instructor issues an instruction to perform said standby operation.
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13. A method for controlling a power supply device that can be switched to a normal operation for supplying electric power to a circuit connected to said power supply device by an instruction issued by an instructor that operates with electric power from said power supply device and a standby operation for not supplying electric power to the circuit connected to said power supply device, wherein
said power supply device includes a voltage generator that generates a DC voltage, a voltage converter that is connected to said voltage generator via said first switch, and converts the DC voltage generated by said voltage generator into a DC voltage for supplying electric power to the circuit connected to said power supply device and said instructor, and a control circuit that is operable to control an opening and closing operation of the first switch by receiving an output voltage of said voltage converter as a power supply voltage via a second switch, said control method comprising the steps of: -
operating said control circuit by closing said second switch in said normal operation; and opening said second switch when a first period has elapsed since said instructor issued an instruction to perform said standby operation, to stop an operation of said control circuit.
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14. A method for controlling a power supply device that can be switched to a normal operation for supplying electric power to a circuit connected to said power supply device by an instruction issued by an instructor that operates with electric power from said power supply device and a standby operation for not supplying electric power to the circuit connected to said power supply device, wherein
said power supply device includes a voltage generator that generates a DC voltage, and a voltage converter that is connected to said voltage generator, and converts a DC voltage generated by said voltage generator into a DC voltage for supplying electric power to the circuit connected to said power supply device and said instructor, said control method comprising the steps of: -
controlling said voltage converter such that an output voltage of said voltage converter has a first value in said normal operation; and controlling said voltage converter such that an output voltage of said voltage converter falls to a second value lower than said first value when said instructor issues an instruction to perform said standby operation.
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Specification