US 2018/0026438 A1Published application

Embedded battery protection system

AssigneesShanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., BCD Semiconductor Manufacturing Limited

InventorsSHAOHUA PENG, Xuguang Zhang

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Abstract

A signal processing circuit includes a first circuit coupled between a power terminal and a first ground terminal and a second circuit coupled between the power terminal and a second ground terminal. The signal processing circuit is configured to receive a first signal at a voltage level relative to the first ground terminal and, in response to the first signal, provide a second signal at a voltage level relative to the second ground terminal. The signal processing circuit can be used in a battery protection circuit for a mobile device having an embedded battery. The battery protection circuit is configured with two NMOS transistors to allow the cell phone circuit to switch between the embedded battery and an external power source.

Claims18

Dependent claims

A battery control circuit for a mobile device, wherein the mobile device has an embedded battery and is configured for coupling to an external power source, the battery control circuit comprising:

first and second high-voltage NMOS transistors coupled in series and configured for connecting between a ground terminal of the embedded battery in the mobile device and a ground terminal of the external power source;
and
a battery protection IC (integrated circuit) including:
a power terminal for coupling to a power terminal of the embedded battery and a power terminal of the external power supply;
a first ground terminal for coupling to the ground terminal of the external power source;
and
a second ground terminal for coupling to the ground terminal of the embedded battery;
wherein the battery protection IC is configured to:
receive a signal from a functional block in the mobile device, the signal having a voltage level relative to the ground terminal of the external power source;
and
in response to the signal, provide one or more control signals having voltage levels relative to the ground terminal of the embedded battery, the control signals being configured to turn on the first and the second high-voltage NMOS transistors to connect the embedded battery to the functional block in mobile device, or to turn off the first and the second high-voltage NMOS transistors to disconnect the embedded battery from the functional block in the mobile device.

8 more elements

A control circuit, comprising:

a power terminal;
first and second ground terminals;
a signal processing circuit including:
a first circuit coupled between the power terminal and the first ground terminal;
and
a second circuit coupled between the power terminal and the second ground terminal,
wherein the signal processing circuit is configured to receive a first signal at a voltage level relative to the first ground terminal and, in response to the first signal, provide a second signal at a voltage level relative to the second ground terminal;
and
a logic circuit coupled between the power terminal and the second ground terminal, the logic circuit being configured to receive the second signal and to provide one or more output signals at voltage levels relative to the second ground terminal in response to the second control signal.

6 more elements

A signal processing circuit, comprising:

a first circuit coupled between a power terminal and a first ground terminal;
and
a second circuit coupled between the power terminal and a second ground terminal;
wherein the signal processing circuit is configured to receive a first signal at a voltage level relative to the first ground terminal and, in response to the first signal, provide a second signal at a voltage level relative to the second ground terminal.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 15/722,823Filed 2 Oct 2017
Priority: 3 Apr 2015
Published: 25 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H02H 7/18
Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection…:…
H02J 7/60
Circuit arrangements for charging or discharging batteries or for supplying loads from batteries: including safety or protection arrangements
G06F 1/263
Power supply means, e.g. regulation thereof: arrangements for using multiple switchable power supplies, e.g. battery and AC
G06F 1/30
Power supply means, e.g. regulation thereof: means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations

Family

Application15/722,823Continuation
US 10,483,753 B2Related patent
US 2018/0026438 A1This patent

From the US filing history. Foreign family members aren’t listed.

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