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US 9,853,540 B2Granted
Power supply circuit
AssigneeAsahi Kasei Microdevices Corporation
InventorMasami Aiura
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AssigneeAsahi Kasei Microdevices Corporation
InventorMasami Aiura
Estimating the term…
A power supply circuit is intended to suppress power consumption when a load is not driven and to shorten a required time to be taken until a boosted voltage to be supplied to a high-side MOS transistor is stabilized when the load is changed from a deactivated state to an activated state. The power supply circuit (power supply circuit 3) supplying power to a load driving circuit (motor driving circuit 2) that drives a load by controlling a high-side MOS transistor M1 on the basis of an input load control signal includes a booster circuit (charge pump 23) configured to boost a voltage of input power and supplies the power of which the voltage is boosted as power for driving the high-side MOS transistor. The booster circuit has power supply capability which varies depending on the load control signal.
A power supply circuit comprising:
A power supply circuit comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Using resistors or capacitors, e.g. potential divider: using capacitors charged and discharged alternately by semiconductor devices with control…
With automatic control of output voltage or current, e.g. switching regulators: including plural semiconductor devices as final control devices…
Apparatus for conversion between ac and ac, between ac and dc, or
About 7 years 10 months of term left · ends 15 Aug 2034 (estimated)
The present invention relates to a power supply circuit that supplies a control voltage and the like for on-off control of transistors used in a DC power supply device such as a motor driver, a DC-DC converter, and a power supply coupler circuit.
A DC power supply device such as a motor driver, a DC-DC converter, and a power supply coupler circuit includes a high-side MOS transistor that converts an input voltage into an output voltage used to drive a load. As an example of such a DC power supply device including the high-side MOS transistor, a circuit has been proposed which generates an ON voltage for driving the high-side MOS transistor through a charging and boosting operation using a charge pump circuit and supplies the generated ON voltage (for example, see Patent Document 1). Patent Document 1: JP 2007-214647 A
However, in the circuit which generates the ON voltage for driving the high-side MOS transistor through a charging operation using the charge pump circuit as described above, the charge pump circuit is driven to supply the ON voltage to the high-side MOS transistor when a driving permission signal for driving a load is input, and the charge pump circuit is deactivated to stop the supply of the ON voltage when a driving permission signal for stopping the load is input.
FIG. 1 is a schematic configuration diagram illustrating an example of a DC power supply device employing a power supply circuit according to the present invention.
FIG. 2 is a configuration diagram illustrating an example of a clock generating unit.
FIGS. 3A to 3H are timing diagrams illustrating examples of signals at the parts of the clock generating unit.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, a first embodiment will be described below.
FIG. 1 is a schematic configuration diagram illustrating an example of a DC power supply device 1 employing a power supply circuit according to the present invention.