Simple driving circuit with load short circuit protection and self recovery functions

A technology of load short circuit and drive circuit, which is applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve the problems of high cost, complex structure, and many devices, and achieve the effect of convenient and simple production, simple control, and cost reduction

Active Publication Date: 2015-07-29
雅安小航电器有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the main power consumption of the drive circuit is the load, once the load is short-circuited, it may cause damage to the drive, so it is generally necessary to design a load short-circuit protection circuit
[0003] Patent CN100570978C discloses a current sinking constant current output drive circuit with load short circuit protection function, which is designed with a load short circuit protection unit, which includes a sampling circuit, a

Method used

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  • Simple driving circuit with load short circuit protection and self recovery functions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] like figure 1 As shown, the simple drive circuit with load short-circuit protection and self-recovery function includes the first triode Q1, the second triode Q2, the control switch SW, the capacitor C, the diode D, and the current limiting resistor R, where:

[0022] The first transistor Q1 is a PNP transistor, and the second transistor Q2 is an NPN transistor;

[0023] The emitter of the first triode Q1 is connected to the power supply V, the base is connected to the collector of the second triode Q2, and the collector is connected to the load RL through the diode D; the anode of the diode D is connected to the collector of the first triode Q1 , the negative pole is connected to the load RL, and the negative pole of the diode D is the output terminal out of the simple drive circuit, which provides the output current for the load RL;

[0024] The second triode Q2 is used as the core protection tube, its base is connected to the collector of the first triode Q1, and th...

Embodiment 2

[0040]The difference between this embodiment and Embodiment 1 is that in this embodiment, a resistor is used to replace the diode D of the unidirectional conduction device. One end of the resistor is connected to the collector of the first triode Q1, and the other end is connected to the load RL.

[0041] When the load RL is short-circuited, the output terminal out is directly pulled down to the power ground (GND), and the base voltage of the second transistor Q2 is equal to the voltage of the resistor. Maintaining the slight conduction of the second transistor Q2, the second transistor Q2 quickly returns to the slight conduction state from the normal conduction state, and the base current of the first transistor Q1 decreases rapidly accordingly, so that Q1 conducts The passing current Ice, that is, the current at the output terminal out also decreases rapidly. The whole circuit is in the micro-conduction state of extremely low current output (the output current is about a few...

Embodiment 3

[0044] The difference between this embodiment and Embodiment 1 is that in this embodiment, the diode D is canceled or a 0 ohm resistor is used instead of the diode D. In this solution, the second transistor Q2 is the core protection tube for load short-circuit protection. When the load RL is short-circuited, the output terminal out of the simple drive circuit is directly pulled down to the ground, so the second transistor Q2 is turned on from normal The state quickly returns to the micro-conduction state, and the base current of the first triode Q1 decreases rapidly accordingly, so that the driving current of the output terminal of the first triode Q1 also decreases rapidly, and the entire circuit is at an extremely low current output The micro-conduction state realizes the short-circuit protection function. When the short circuit of the load RL is eliminated, the micro-conduction current of the first transistor Q1 passes through the load RL to generate a micro voltage superim...

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Abstract

The invention discloses a simple driving circuit with load short circuit protection and self recovery functions, which comprises a first triode, a second triode, a control switch, a capacitor and a current-limiting resistor, wherein the first triode is a PNP-type triode; the second triode is an NPN-type triode; the emitter of the first triode is connected with a power supply, the base is connected with the collector of the second triode, and the collector is connected with a load; the base of the second triode is connected with the collector of the first triode, and the emitter is grounded via the current-limiting resistor and the control switch serially connected together; and two ends of the capacitor are connected with the collector and the emitter of the second triode respectively. Two triodes are mainly adopted to build an extremely simple and practical driving circuit with short circuit protection and self recovery functions, the circuit uses few devices, the cost is low, manufacturing is simple and easy, the control is simple, and the circuit can be widely applied to various driving circuits.

Description

technical field [0001] The invention relates to the technical field of drive circuits, in particular to a simple drive circuit with load short-circuit protection and self-recovery functions. Background technique [0002] At present, with the development of electronic technology, drive circuits are widely used in many fields such as automotive electronics, power supply circuits, and LED drivers. The drive circuit drives the load according to the control signal, which has the advantage of intelligent and convenient control. However, since the main power consumption of the drive circuit is the load, once the load is short-circuited, it may cause damage to the drive, so it is generally necessary to design a load short-circuit protection circuit. [0003] Patent CN100570978C discloses a current sinking constant current output drive circuit with load short circuit protection function, which is designed with a load short circuit protection unit, which includes a sampling circuit, a...

Claims

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Application Information

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IPC IPC(8): H03K17/687
Inventor 古秋翔
Owner 雅安小航电器有限责任公司
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