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Charge/discharge control circuit and battery device

A charge and discharge control and control circuit technology, applied in the field of charge and discharge control circuits, can solve the problems of large layout area, large leakage current, and large number of components, and achieve the effect of reducing layout area and leakage current

Inactive Publication Date: 2012-04-04
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, in the prior art, there is a problem that the number of components is large and the layout area is large
Furthermore, there is a problem that the gate voltage of the enhancement type N-channel MOSFET 306 drops only to the source or drain voltage +VF (approximately 0.6V), and the leakage current becomes large when the enhancement type N-channel MOSFET 306 is off.

Method used

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  • Charge/discharge control circuit and battery device
  • Charge/discharge control circuit and battery device
  • Charge/discharge control circuit and battery device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 It is a circuit diagram of the battery device having the charge and discharge control circuit 151 according to the first embodiment.

[0029] The battery device having the charge and discharge control circuit 151 of this embodiment includes a secondary battery 101, a control circuit 102, a bidirectional conduction field effect transistor 114, external terminals 120 and 121 to which a charger 132 or a load 131 is connected, a Schottky Barrier diodes 112 and 113 , PMOS transistor 110 and NMOS transistor 111 . The switch circuit 152 is constituted by the PMOS transistor 110, the NMOS transistor 111, the terminal 124 (second terminal), and the terminal 125 (first terminal).

[0030] Both ends of the secondary battery 101 are connected to a positive power supply terminal 122 and a negative power supply terminal 123 . The control circuit 102 is connected to the positive power supply terminal 122 as the positive power supply, and connected to the terminal 125 as th...

Embodiment 2

[0038] figure 2 It is a circuit diagram of a battery device having a charge and discharge control circuit 251 according to the second embodiment.

[0039] The battery device having the charge and discharge control circuit 251 of the second embodiment has a secondary battery 101, a control circuit 102, a bidirectional conduction field effect transistor 214, external terminals 120 and 121 to which a charger 132 or a load 131 is connected, a Schott Base barrier diodes 212 and 213, PMOS transistor 210, and NMOS transistor 211. The switch circuit 252 is constituted by the PMOS transistor 210, the NMOS transistor 211, the terminal 124 (second terminal), and the terminal 125 (first terminal).

[0040] Both ends of the secondary battery 101 are connected to a positive power supply terminal 122 and a negative power supply terminal 123 . The control circuit 102 is connected to the terminal 125 as a positive power supply, connected to the negative power supply terminal 123 as a negati...

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PUM

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Abstract

Provided is a battery device including, in a charge / discharge protection circuit for controlling charge / discharge of a secondary battery by a single bidirectionally conductive field effect transistor, a charge / discharge control circuit with which the layout area is reduced and a leakage current of the bidirectionally conductive field effect transistor is reduced to perform stable operation. The charge / discharge control circuit includes: a switch circuit for controlling a gate of the bidirectionally conductive field effect transistor based on an output of a control circuit for controlling the charge / discharge of the secondary battery; and two Schottky barrier diodes for preventing back-flow of a charge current and a discharge current. The first Schottky barrier diode has a cathode connected to a drain of the bidirectionally conductive field effect transistor, and the second Schottky barrier diode has a cathode connected to a source of the bidirectionally conductive field effect transistor.

Description

technical field [0001] The present invention relates to a charge and discharge control circuit and a battery device for detecting the voltage and abnormality of a secondary battery, in particular to a charge and discharge control circuit and a battery device that can be controlled by one charge and discharge control MOSFET. Background technique [0002] image 3 A circuit diagram of a conventional battery device having a charge and discharge control circuit is shown. In a conventional battery device having a charge and discharge control circuit, an enhancement type N-channel MOSFET 306 capable of bidirectional on-off is connected in series to the negative side of the secondary battery 101 . A charging circuit or a load is connected to the terminals 120 and 121 , and a charging and discharging current is supplied or discharged to the secondary battery 101 through the terminals. The control circuit 102 detects the voltage of the secondary battery 101 and the enhancement type ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0034Y02E60/10H01M10/44H02J7/04
Inventor 樱井敦司小池智幸佐野和亮前谷文彦
Owner SEIKO INSTR INC