Power supply device and electric circuit
AssigneeSanyo Electric Co., Ltd.
InventorTakashi Kabasawa
Life of this patent
Estimating the term…
Abstract
An FET for malfunction check is connected between the gate and source of an FET for power-source output control, which is connected in series in a power output line from a battery used as a power source for a load. A malfunction determination circuit determines whether the FET for power-source output control is operating normally or not, by monitoring output voltage of the FET for malfunction check. Further, the malfunction determination circuit identifies malfunction of the FET for power-source output control due to short-circuiting during actual use.
Claims6
A power supply device used as a power source for a load, comprising:
- an FET for power-source output control connected in series in a power output line,
- an FET for malfunction check connected between the gate and source of the FET for power-source output control, and
- a malfunction determination circuit for determining whether the FET for power-source output control is operating normally or not, by monitoring output voltage of the FET for malfunction check,
- wherein the FET for power-source output control is controlled to be in on- or off-state by a charge/discharge control circuit controlling gate voltage of the FET for power-source output control, and
- when the output voltage of the FET for malfunction check disappears while the FET for power-source output control is controlled to be in on-state, the malfunction determination circuit determines that this indicates malfunction of the FET for power-source output control due to short-circuiting.
The A power supply device used as a power source for a load, comprising:
- an FET for power-source output control connected in series in a power output line,
- an FET for malfunction check connected between the gate and source of the FET for power-source output control, and
- a malfunction determination circuit for determining whether the FET for power-source output control is operating normally or not, by monitoring output voltage of the FET for malfunction check,
- wherein the FET for power-source output control forms a power output line from a positive electrode of a rechargeable battery, with its source connected to the positive electrode of the rechargeable battery and its drain connected to a load,
- the FET for malfunction check is connected between the gate and source of the FET for power-source output control, with its source and gate connected to the source and gate of the FET for power-source output control, respectively, and
- the malfunction determination circuit detects drain voltage of the FET for malfunction check.
Dependencies are inferred from the claim text.