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Battery current-limiting protection circuit and battery current-limiting protecting method

A technology of current-limiting protection and current-limiting resistors, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, protections that respond to overcurrents, etc. High, low circuit efficiency, safety hazards and other issues, to achieve high explosion-proof safety protection level, reduce electrical power consumption, increase the effect of safety

Pending Publication Date: 2018-05-29
北京拓盛智联技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the explosion-proof requirements are relatively high and the current output is relatively large, none of the above circuits can meet the explosion-proof requirements.
Its defects mainly include: 1. The integrated circuit itself is prone to failures such as breakdown, which is an unreliable device in the explosion-proof standard; 2. When the output current is relatively large, the larger sampling current-limiting resistor has lower circuit efficiency and will A large amount of heat is generated on the sampling current-limiting resistor, and the rated power of the resistor is required to be high; especially in a fault state such as a short circuit, a large amount of heat will be generated, causing the temperature of the component to be too high, even exceeding the temperature level requirements of the explosion-proof equipment. pose a serious safety hazard

Method used

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  • Battery current-limiting protection circuit and battery current-limiting protecting method
  • Battery current-limiting protection circuit and battery current-limiting protecting method
  • Battery current-limiting protection circuit and battery current-limiting protecting method

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Embodiment 1

[0035] Embodiments of the present invention provide a battery current limiting protection circuit composed of all discrete components to avoid defects caused by the integrated circuit itself. figure 1 It is a schematic diagram of the component connection relationship of the battery current limiting protection circuit in an embodiment of the present invention. Such as figure 1 As shown, the battery current limiting protection circuit includes: current limiting resistor Rsense, differential amplifier 12, reference voltage generator 13, MOSFET 15 for output current control and its drive circuit ( figure 1 not shown).

[0036] The sampling current limiting resistor Rsense is connected in series with the battery at the input end of the circuit.

[0037] The reference voltage generator 13 is used to generate a reference voltage (or referred to as reference voltage) Vref. exist figure 1 In the schematic circuit diagram shown, the reference voltage generator 13 is connected to the...

Embodiment 2

[0049] image 3 Shown is a schematic diagram of the component connection relationship of the battery current limiting protection circuit in the second embodiment. image 3 The present embodiment shown, in addition to having figure 1 In addition to all the components shown in , there is also a shutdown control circuit 16 for controlling the battery powered circuit. The shutdown control circuit 16 is used to shut down the battery power supply circuit when the battery output current is higher than a predetermined value, for example, when the battery output current is higher than a predetermined value, so that the actual power consumption and / or voltage on the MOSFET 15 is constantly increasing and exceeds a predetermined value. value, MOSFET 15 is turned off.

[0050] Figure 4 shows an example of the drive circuit and turn-off control circuit of the MOSFET in Embodiment 2 of the present invention, such as Figure 4 As shown, the shutdown control circuit 16 includes a transis...

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Abstract

The invention provides a battery current-limiting protection circuit and a battery current-limiting protecting method. The battery current-limiting protection circuit comprises a current-limiting resistor, a reference voltage generator, a differential amplifier and an MOSFET, wherein the current-limiting resistor is in series connection with a battery, the reference voltage generator is used for generating a reference voltage signal, and the differential amplifier is connected with the current-limiting resistor and the reference voltage generator, and voltage drop on the current-limiting resistor and the reference voltage signal serve as input for differential amplification; the MOSFET is connected with the output end of the current-limiting resistor and the output end of the differentialamplifier, and controls battery output current flowing through the current-limiting resistor based on output of the differential amplifier. By means of the battery current-limiting protection circuitconstituted by full discrete components, when the circuit has a low sampling current-limiting resistance value, the current sampling signal resolution precision and protection circuit control which can only be achieved by an integrated circuit amplifier in the prior art are also achieved by the battery current-limiting protection circuit; meanwhile, the safety of the protection circuit is improved, and the higher anti-explosion safety protection level is achieved.

Description

technical field [0001] The invention relates to the technical field of battery protection, in particular to a battery current limiting protection circuit and a battery current limiting protection method. Background technique [0002] The existing battery current limiting protection circuit is generally composed of an integrated circuit amplifier and a sampling circuit, or a current limiting protection circuit composed of a relatively large sampling current limiting resistor. However, when the explosion-proof requirements are relatively high and the current output is relatively large, none of the above circuits can meet the explosion-proof requirements. Its defects mainly include: 1. The integrated circuit itself is prone to failures such as breakdown, which is an unreliable device in the explosion-proof standard; 2. When the output current is relatively large, the larger sampling current-limiting resistor has lower circuit efficiency and will A large amount of heat is gener...

Claims

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Application Information

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IPC IPC(8): H02H9/02H02H3/08H02H7/18
CPCH02H3/08H02H7/18H02H9/025Y02E60/10
Inventor 马昂马云龙
Owner 北京拓盛智联技术有限公司
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