Power device
First Claim
1. A power device comprising:
- a switching regulator having a switching element connected to a transformer or a coil, and a control circuit for generating an on/off signal to control the switching element, and supplying an input voltage from a power source to a first load by the on/off operation of the switching element in accordance with the on/off signal; and
a charge pump circuit for accumulating an electric charge in accordance with the input voltage from the power source during an operation for turning on the switching element, and discharging the accumulated electric charge to a second load during an operation for turning off the switching element.
1 Assignment
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Accused Products
Abstract
To control individually a plurality of loads to be turned on by combining a switching regulator with a charge pump circuit using some of the components of the switching regulator. An LED is controlled to be turned on by a switching regulator having an NMOS transistor connected to a transformer and a control circuit for generating an on/off signal. An LED is controlled to be turned on by a charge pump circuit that shares the NMOS transistor and the control circuit with the switching regulator to charge a condenser with an electric charge during an operation for turning on the NMOS transistor and discharge the electric charge accumulated in the condenser during an operation for turning off the NMOS transistor. Thus, circuit structure is simplified.
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Citations
10 Claims
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1. A power device comprising:
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a switching regulator having a switching element connected to a transformer or a coil, and a control circuit for generating an on/off signal to control the switching element, and supplying an input voltage from a power source to a first load by the on/off operation of the switching element in accordance with the on/off signal; and
a charge pump circuit for accumulating an electric charge in accordance with the input voltage from the power source during an operation for turning on the switching element, and discharging the accumulated electric charge to a second load during an operation for turning off the switching element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification