Sanyo Electric Co., Ltd.

Tokyo Sanyo Electric Co.

Takeshi Osawa

Kimihiko Furukawa

Junya Yano

Masaki Yugou

Kouichi Noma

Kazuto Matsuda

Toshio Sakurai

Toshiaki Kawada

Ryuta Iwasaki

Toshio Fukamachi

The car power source apparatus is provided with a leakage detection circuithaving a batterywith a plurality of battery unitsconnected in series, a first series circuitmade up of first leakage detection resistorsand a first leakage detection switchto connect the first connection nodeof the series connected battery unitsto ground, a second series circuitmade up of second leakage detection resistorsand a second leakage detection switchto connect the second connection nodeof the series connected battery unitsto ground, and voltage detection circuitsto detect voltage of the first leakage detection resistorsand the second leakage detection resistors. Further, the car power source apparatus is provided with a failure detection circuitto control the first leakage detection switchand the second leakage detection switchON and OFF and determine failure of the leakage detection circuitfrom voltages detected by the voltage detection circuits

Car power source apparatus

An electric power source for a motor vehicle is equipped with a welded state discriminator, and while a positive-side contactor and negative-side contactor are controlled to be switched off, the welded state discriminator detects a voltage of a positive-side contactor or negative-side contactor on its loading side with respect to a connecting point of a battery unit on a positive side and a battery unit on a negative side. Accordingly, when in a plus voltage where the detected voltage thus obtained is larger than a predetermined voltage, the positive-side contactor is judged to be in a welded state, and when in a minus voltage where the detected voltage is larger than the predetermined voltage, the negative-side contactor is judged to be in a welded state.

Electric power source for motor vehicle

The car power source apparatus is provided with a plurality of batteries, a temperature detection circuit, and an abnormal temperature rise prevention circuit. The temperature detection circuit detects electrical resistance change of a plurality of temperature sensors via a voltage conversion circuit, converts voltage conversion circuit output voltage into a digital signal via an A/D converter, and inputs that signal into a control circuit as a temperature signal. The abnormal temperature rise prevention circuit is provided with comparators to compare output voltage from the voltage conversion circuit of the temperature detection circuit with a reference voltage and output an abnormal temperature signal if battery temperature rises to a specified temperature, and a forced current cut-off circuit connected to the comparators to detect a comparator abnormal temperature signal and cut-off battery current. The control circuit and the abnormal temperature rise prevention circuit monitor battery temperature, and cut-off battery current.

The car power source apparatus switches a pair of contactors (driving battery relays) connected to positive and negative output sides of a driving battery via a switching circuit with an auxiliary battery as power supply. The switching circuit is provided with a voltage detection circuit to detect auxiliary battery voltage, a series switching circuit to connect coils of the pair of contactors in series and switch both contactor contacts on, and a parallel switching circuit to connect coils of the pair of contactors in parallel and switch both contactor contacts on. When auxiliary battery voltage is higher than a set voltage, it connects the pair of contactor coils in series to switch the contacts on via the series switching circuit, and when auxiliary battery voltage is lower than a set voltage, it connects the pair of contactor coils in parallel to switch the contacts on via the parallel switching circuit.

The present provides a leakage detection circuit for an electric vehicle, and so on, capable of calculating a leakage resistance. The leakage detection circuit for an electric vehicle detects a current I(t) that flows in leakage resistances Rand Rwhen one leakage detection switch SWis closed at tand the other leakage detection switch SWis opened, and detects a current I(t) when the switch SWis opened at tand the switch SWis closed. In addition, the circuit detects voltages V(t, t) and V(t, t) of portions where these leakage detection resistances Rare connected. A combined value Rof the leakage resistances is calculated by a leakage calculator based on the following equation 34

Battery leakage detection circuit for electric vehicle and leakage detection method for electric vehicle

An ultrasonic humidifier for atomizing water in a vessel by an ultrasonic oscillator and supplying atomized water with air into a room by a blower comprising a humidity sensor detecting the humidity in the room and a thermosensor detecting the temperature in the room. The operation of said ultrasonic oscillator is controlled in such a manner that the value of the detected humidity compensated by said thermosensor may be set for the desired value.

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Takasago, Japan

Takeshi Osawa