Emergency light and indicator circuit thereof

Patent metadata

Field	Value
Publication number	US-11644159-B2
Application number	US-202016878940-A
Country	US
Kind code	B2
Filing date	May 20, 2020
Priority date	Jan 17, 2020
Publication date	May 9, 2023
Grant date	May 9, 2023

Abstract

An indicator circuit for an emergency light, including: a charging circuit, in connection with a positive terminal of a lithium battery and configured to charge the lithium battery; a battery protection circuit, in connection with a negative terminal of the lithium battery and configured to provide protection against overvoltage and overcurrent of an electrical signal output by the lithium battery; a main control circuit, in connection with the negative terminal of the lithium battery and configured to compare the electrical signal output by the lithium battery with a reference voltage signal and output a control signal; and a drive circuit, in connection with the main control circuit and an indicator light, and configured to drive the indicator light to illuminate according to the control signal and turn off the indicator light in case of abnormal conditions.

First claim

What is claimed is:

1. An indicator circuit for an emergency light, comprising:
a charging circuit, in connection with a positive terminal of a lithium battery and configured to charge the lithium battery;
a battery protection circuit, in connection with a negative terminal of the lithium battery and configured to provide protection against overvoltage and overcurrent of an electrical signal output by the lithium battery;
a main control circuit, in connection with the negative terminal of the lithium battery and configured to compare the electrical signal output by the lithium battery with a reference voltage signal and output a control signal; and
a drive circuit, in connection with the main control circuit and an indicator light, and configured to drive the indicator light to illuminate according to the control signal and turn off the indicator light in case of abnormal conditions;

wherein
the main control circuit comprises:
a comparison sub-circuit, in connection with the negative terminal of the lithium battery and configured to compare the electrical signal output by the lithium battery with the reference voltage signal and output a feedback signal; and
a control sub-circuit, in connection with the comparison sub-circuit and configured to process the feedback signal and output the control signal; and

the comparison sub-circuit comprises:
a first resistor, a second resistor, and a comparison assembly; and
a first terminal of the first resistor is in connection with a power supply, a second terminal of the first resistor and a first terminal of the second resistor are in common connection with a first input terminal of the comparison assembly, the first input terminal of the comparison assembly is input with the reference voltage signal, a second input terminal of the comparison assembly is in connection with the negative terminal of the lithium battery, a second terminal of the second resistor is grounded, and an output terminal of the comparison assembly is in connection with the control sub-circuit.

2. The indicator circuit according to claim 1 , further comprising:
a charging protection circuit, in connection with the charging circuit and the lithium battery and is configured to perform filtration and anti-electromagnetic interference on the electrical signal output by the charging circuit.

3. The indicator circuit according to claim 1 , wherein the control sub-circuit adopts a microcontroller unit.

4. The indicator circuit according to claim 1 , wherein the charging circuit comprises an AC/DC power supply with a preset voltage value.

5. The indicator circuit according to claim 1 , wherein the control signal is regulated according to a state of the lithium battery and variation of a value of the reference voltage signal.

6. The indicator circuit according to claim 5 , wherein the state of the lithium battery comprises: a charge state, a discharge state, a fully charged state, and an unplugged state of the lithium battery.

Assignees

• Xiamen Eco Lighting Co Ltd

Inventors

• Xie Jianxin
• Xu Mingshu
• Lan Tian

Classifications

• H02J2105/44

  Portable electronic devices · CPC title

• H02J7/64

  against overvoltage · CPC title

• H02J7/62

  against overcurrent · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title