# US 10,245,956 B2 · Preventing high induced voltage from being applied to discharge control device

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- Number: US 10,245,956 B2
- Document ID: US10245956B2
- Status: Granted
- Kind: B2
- Application number: 14/800,994
- Filed: 2015-07-16
- Published: 2016-03-03
- Granted: 2019-04-02
- Earliest claimed: 2014-08-28
- Assignees: Keihin Corporation
- Applicants: Keihin Corporation
- Inventors: Ryutaro Minesawa
- Web page: https://patentgrep.com/patent/US10245956B2

## CPC

- B60L 3/04: Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H)
- B60L 3/0007: {Measures or means for preventing or attenuating collisions}
- B60L 7/18: Controlling the braking effect (B60L7/12, B60L7/14, B60L7/16 take precedence)
- B60L 2240/427: Voltage
- B60L 2240/527: Voltage
- H02J 7/345: {using capacitors as storage or buffering devices}
- Y02T 10/64: Electric machine technologies in electromobility
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A discharge control device controls a discharge bypass circuit for discharging a charge in a capacitor provided in a drive device for a motor that rotates wheels of a vehicle at time of a collision of the vehicle. The discharge control device includes a control circuit that makes the discharge bypass circuit start discharge if an induced voltage by the motor surpasses a predetermined threshold.

## Claims

### Claim 1

A discharge control device that controls a discharge bypass circuit for discharging, at time of a collision of a vehicle, a charge in a capacitor provided in a drive device for a motor that rotates wheels of the vehicle, the drive device supplying a power received from a battery to the motor to drive the motor, the drive device supplying the power to the discharge control device,
the discharge control device comprising
a control circuit that makes the discharge bypass circuit start discharge at the time of the collision of the vehicle by receiving a discharge instruction signal, and after discharge of the charge in the capacitor, makes the discharge bypass circuit start discharge when an induced voltage induced by the motor surpasses a predetermined threshold,
wherein the drive device is electrically connected to the motor and the discharge control device such that the induced voltage induced by the motor is applied to the discharge control device via the drive device,
wherein the control circuit includes:
(i) a flip-flop circuit that:
outputs an output signal that is a discharge instruction to the discharge bypass circuit at the time of the collision of the vehicle by receiving the discharge instruction signal to an input terminal of the flip-flop circuit,
stops, after discharge of the charge in the capacitor, the output of the output signal upon receiving a reset signal, and
resumes output of the output signal when a reset release signal is input to the flip-flop circuit, and
(ii) a reset control circuit that outputs the reset release signal to the flip-flop circuit when the induced voltage induced by the motor surpasses the predetermined threshold,
wherein the drive device is connected to the discharge control device via a power line such that the drive device supplies power to the discharge control device via the power line,
wherein the reset control circuit is connected to the power line, the reset control circuit determines whether the induced voltage induced in the power line surpasses the predetermined threshold,
wherein the flip-flop circuit and the reset control circuit are supplied with power through the power line.

### Claim 2 (depends on 1)

The discharge control device according to claim 1, wherein the discharge bypass circuit discharges the induced voltage.

### Claim 3 (depends on 1)

A vehicle comprising the discharge control device according to claim 1.