ONBOARD ELECTRIC SYSTEM
First Claim
1. An onboard electric system comprising:
- a drive circuit that drives an electric motor mounted to a vehicle based on an output voltage of a direct current power supply;
a first smoothing capacitor that stabilizes the output voltage applied between two power input electrodes of the drive circuit from the direct current power supply;
a drive signal generator that outputs to the drive circuit, a control signal controlling the drive circuit, causing the electric motor to be driven based on the output voltage of the direct current power supply;
a first discharge resistor that is connected between a positive electrode and a negative electrode of the first smoothing capacitor;
a first discharge switcher that is connected in series to the first discharge resistor between the positive electrode and the negative electrode of the first smoothing capacitor, and releases or makes a connection between the positive electrode and the negative electrode of the first smoothing capacitor; and
an off-signal generator that outputs to the first discharge switcher, an off signal causing the first discharge switcher to release the connection between the positive electrode and the negative electrode of the first smoothing capacitor,wherein;
the first discharge switcher is provided by a switcher of a normally-ON type that makes the connection between the positive electrode and the negative electrode of the first smoothing capacitor through the first discharge resistor in a period other than a period while the off-signal generator provides the off signal.
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Accused Products
Abstract
An onboard electric system includes a drive circuit that drives an electric motor based on an output voltage of a direct current power supply; a first smoothing capacitor; a drive signal generator; a first discharge resistor that is connected between a positive electrode and a negative electrode of the first smoothing capacitor; a first discharge switcher that is connected in series to the first discharge resistor between the positive electrode and the negative electrode, and releases or makes a connection between the positive electrode and the negative electrode; and an off-signal generator that outputs an off signal to the first discharge switcher. The first discharge switcher is provided by a switcher of a normally-ON type that makes the connection between the positive electrode and the negative electrode through the first discharge resistor in a period other than a period while the off-signal generator provides the off signal.
19 Citations
16 Claims
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1. An onboard electric system comprising:
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a drive circuit that drives an electric motor mounted to a vehicle based on an output voltage of a direct current power supply; a first smoothing capacitor that stabilizes the output voltage applied between two power input electrodes of the drive circuit from the direct current power supply; a drive signal generator that outputs to the drive circuit, a control signal controlling the drive circuit, causing the electric motor to be driven based on the output voltage of the direct current power supply; a first discharge resistor that is connected between a positive electrode and a negative electrode of the first smoothing capacitor; a first discharge switcher that is connected in series to the first discharge resistor between the positive electrode and the negative electrode of the first smoothing capacitor, and releases or makes a connection between the positive electrode and the negative electrode of the first smoothing capacitor; and an off-signal generator that outputs to the first discharge switcher, an off signal causing the first discharge switcher to release the connection between the positive electrode and the negative electrode of the first smoothing capacitor, wherein; the first discharge switcher is provided by a switcher of a normally-ON type that makes the connection between the positive electrode and the negative electrode of the first smoothing capacitor through the first discharge resistor in a period other than a period while the off-signal generator provides the off signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification