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Current-limiting delay protection circuit of lithium battery charge drill

A technology of time-delay protection and lithium battery, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of short service life, motor burnout, troublesome use, etc., achieve long service life, protect motor and battery, structure Design simple and scientific effects

Inactive Publication Date: 2012-07-11
东莞市妙达电动工具制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, lithium batteries are used in electric tools and electric drills. Generally, there is no current monitoring for lithium batteries. Only the voltage and temperature of lithium batteries are used to protect the battery and the motor of the electric drill. If the electric drill is stuck, it will immediately stop powerless. Rotating, or not stopping when the drill is stuck, will cause the motor to burn out, causing great trouble to use, and the service life of the product is not long

Method used

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  • Current-limiting delay protection circuit of lithium battery charge drill
  • Current-limiting delay protection circuit of lithium battery charge drill
  • Current-limiting delay protection circuit of lithium battery charge drill

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Embodiment Construction

[0011] see Figure 1 to Figure 3 Shown: The present invention includes lithium battery 1, switch control 2, current sampling module 3, signal amplification module 4, microprocessor 5, drive circuit module 6, motor 7, lithium battery 1, switch control 2, current sampling module 3. The signal amplifying module 4 and the microprocessor 5 are connected in series in sequence. The current sampling module 3 and the microprocessor 5 are electrically connected to the drive circuit module 6, the output end of the drive circuit module 6 is electrically connected to the motor 7, the lithium battery 1, the switch control 2 It is electrically connected to the microprocessor 5 through the temperature / voltage and control signal generator 8.

[0012] The signal amplification module 4 inputs current information sampling for the microprocessor 5.

[0013] The microprocessor 5 is electrically connected to the input terminal of the driving circuit module 6 through pulse width modulation.

[0014] A hig...

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Abstract

The invention relates to the technical field of supply circuits, in particular relates to a current-limiting delay protection circuit of a lithium battery charge drill, which comprises a lithium battery, a switch control, a current sampling module, a signal amplifying module and a microprocessor which are sequentially connected in series, wherein the current sampling module and the microprocessor are electronically connected with a driving circuit module, the output end of the driving circuit module is electronically connected with a motor, and the lithium battery and the switch control are electronically connected with the microprocessor after passing through a temperature / voltage and control signal generator. The current-limiting delay protection circuit has a simple and scientific structure design; the current is fed back in the circuit, a driving circuit is controlled through the microprocessor, so as to realize limiting of maximum current of the motor, and the current-limiting delay protection circuit is turned on or off within a certain time after reaching the maximum current, so that the effect of protecting the motor and the battery is achieved, meanwhile, the drill is powerful, and the current-limiting delay protection circuit has long service life.

Description

Technical field: [0001] The invention relates to the technical field of power supply circuits, in particular to a lithium battery charging drill current-limiting delay protection circuit. Background technique: [0002] At present, lithium batteries are used in power tools and hand drills. Generally, there is no current monitoring of the lithium battery. Only the voltage and temperature of the lithium battery are tested to protect the battery and the electric drill motor. If the hand drill is stuck, it will immediately be unable to stop. Rotating or not stopping when the drill is stuck will cause the motor to burn out, which will cause a lot of trouble in use, and the service life of the product will not be long. Summary of the invention: [0003] The purpose of the present invention is to provide a lithium battery charging drill current-limiting delay protection circuit for the shortcomings of the prior art. Its structure is simple and scientific, and the current feedback in the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/085H02H7/18
Inventor 张耀霞
Owner 东莞市妙达电动工具制造有限公司
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