Switch box

Patent metadata

Field	Value
Publication number	US-10164628-B2
Application number	US-201514933138-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Nov 6, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A switch box includes a relay transistor circuit connecting a pair of batteries in parallel, and an breaker circuit that breaks the relay transistor circuit when a sign of a potential difference between a potential of at least one of the pair of batteries connected to the relay transistor circuit and a predetermined reference potential is reversed with respect to the sign of the potential difference in which the batteries are correctly connected.

First claim

What is claimed is:

1. A switch box comprising:
a relay transistor circuit configured to connect a pair of batteries in parallel; and
a breaker circuit configured to break the relay transistor circuit when a sign of a potential difference between a potential of at least one of the pair of batteries connected to the relay transistor circuit and a predetermined reference potential is reversed with respect to the sign of the potential difference in which the batteries are correctly connected,
wherein the relay transistor circuit includes a pair of N-channel MOSFETs having source terminals connected back to back,
wherein the breaker circuit includes a short-circuiting circuit that short-circuits the source terminal and a gate terminal of each of the N-channel MOSFETs, and
wherein the short-circuiting circuit includes a short-circuiting N-channel MOSFET connected serially between the source terminal and the gate terminal of each of the N-channel MOSFETs, and having a gate terminal set at the reference potential.

2. The switch box according to claim 1 , further comprising:
an off circuit configured to apply a high level voltage to the gate terminal of the short-circuiting N-channel MOSFET so as to switch off the N-channel MOSFETs included in the relay transistor circuit, based on an all-off control signal from outside.

3. The switch box according to claim 2 , wherein
the reference potential is set to a ground potential.

4. The switch box according to claim 2 , wherein
the pair of N-channel MOSFETs have gate terminals commonly connected, and
the short-circuiting circuit is commonly connected to the N-channel MOSFETs included in each of the relay transistor circuits, and short-circuits the source terminal and the gate terminal of each of the N-channel MOSFETs simultaneously.

5. The switch box according to claim 1 , wherein
the reference potential is set to a ground potential.

6. The switch box according to claim 1 , wherein
the pair of N-channel MOSFETs have gate terminals commonly connected,
the relay transistor circuit includes a plurality of pairs of relay transistor circuits provided in parallel between the pair of batteries, and
the short-circuiting circuit is commonly connected to the N-channel MOSFETs included in each of the relay transistor circuits, and short-circuits the source terminal and the gate terminal of each of the N-channel MOSFETs simultaneously.

Assignees

• Yazaki Corp

Inventors

• Serizawa Akira

Classifications

• H02J2105/33

  exchanging power with road vehicles · CPC title

• H02J7/63

  against overdischarge · CPC title

• H02J7/61

  against overcharge · CPC title

• H02J7/575

  Parallel/serial switching of connection of batteries to charge or load circuit · CPC title

• H02J1/10

  Parallel operation of DC sources · CPC title