CHARGING CIRCUIT

• US 20150115875A1
• Filed: 10/22/2014
• Published: 04/30/2015
• Est. Priority Date: 10/25/2013
• Status: Abandoned Application

• Current Assignee: Yokogawa Test & Measurement Corporation (Yokogawa Electric Corporation)
• Original Assignee: Yokogawa Electric Corporation, Yokogawa Meters & Instruments Corporation (Yokogawa Electric Corporation)
• Inventors: KOMAMAKI, Moritoshi, OOMIYA, Masashi
• Application Number:
  US14/520,629
• Publication Number:
  US 20150115875A1
• Time in Patent Office: Days
• US Class Current: 320/107
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H02J 7/007 Regulation of charging or discharging current or voltage

Abstract

A charging circuit for charging a rechargeable battery, the charging circuit includes: a switching element connected to a power supply; a pulse width controller configured to control open and close of the switching element; and a MOSFET arranged between the switching element and the rechargeable battery. The charging circuit may further include a thermistor connected between a gate and a source of the MOSFET.

Claims

1. A charging circuit for charging a rechargeable battery, the charging circuit comprising:

a switching element connected to a power supply;

a pulse width controller configured to control open and close of the switching element; and

a MOSFET arranged between the switching element and the rechargeable battery.

2. The charging circuit according to claim 1 further comprising a thermistor connected between a gate and a source of the MOSFET.

3. The charging circuit according to claim 1 further comprising a voltage control unit configured to control a gate to source voltage of the MOSFET.

4. The charging circuit according to claim 2 further comprising a voltage control unit configured to control a gate to source voltage of the MOSFET.

5. The charging circuit according to claim 3 further comprising a load,

wherein the voltage control unit is configured to reduce the gate to source voltage of the MOSFET when a load current supplied to the load is larger, while to increase the gate to source voltage of the MOSFET when the load current is smaller.

6. The charging circuit according to claim 4 further comprising a load,

wherein the voltage control unit is configured to reduce the gate to source voltage of the MOSFET when a load current supplied to the load is larger, while to increase the gate to source voltage of the MOSFET when the load current is smaller.

7. The charging circuit according to claim 3,

wherein the voltage control unit includes a plurality of load circuits having different voltage values, and

the plurality of load circuits is configured to be selectively connected to a gate of the MOSFET.

8. The charging circuit according to claim 3,

wherein the voltage control unit includes a plurality of load circuits having different voltage values, and

the plurality of load circuits is configured to be selectively connected to a gate of the MOSFET.