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Overload judgment method of triode inductive load circuit

An inductive load, triode technology, applied in the field of load abnormality detection and protection of triode load circuit, can solve problems such as the inability to turn off Q1 and the damage of triode Q1, etc.

Inactive Publication Date: 2021-04-27
河南嘉晨智能控制股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the load coil is mistakenly connected to a large current load or short-circuited, the current flowing through the transistor Q1 is too large, and Q1 will enter the saturation region
At this time, even when the PWM drive signal Q1_PWM is switched to a low level, Q1 cannot be turned off, but it will cause the transistor Q1 to be damaged due to overload.

Method used

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  • Overload judgment method of triode inductive load circuit
  • Overload judgment method of triode inductive load circuit

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Embodiment Construction

[0009] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0010] figure 1 The load properties of the triode Q1 in the triode inductive load circuit shown will affect the delay time of the voltage at both ends of C and E to completely establish relative to the falling edge of the PWM signal. Specific effects such as figure 2 As shown, when its inductive load is normal, the PWM drive signal Q1_PWM( figure 2 When the falling edge of the shown waveform a) arrives, the voltage waveforms at both ends of the transistors C and E will not immediately jump to the voltage of the power supply DC ( figure 2 The shown waveform b), but due to the taili...

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Abstract

The invention discloses an overload judgment method of a triode inductive load circuit. According to the method, based on different sampling voltages at the C end and the E end caused by the load difference of triodes, whether the load is overloaded or not is judged by comparing the sampling voltages at the C end and the E end of the triodes. On the basis of an original triode inductive load circuit, the overload of the triode inductive load circuit can be found in time through the method provided by the invention, and the damage to a triode in the circuit is avoided.

Description

technical field [0001] The invention relates to the field of abnormal load detection and protection of a triode load circuit, in particular to an overload judging method of a triode inductive load circuit. Background technique [0002] It is common to use triode inductive loads in practical applications. For example, the loads in drive circuits such as buzzer circuits, speakers, and solenoid valves are all inductive. figure 1 It is a schematic diagram of a typical triode inductive load drive circuit. Wherein, Q1 is a triode, and usually the triode Q1 is driven by a PWM signal Q1_PWM to realize the regulation of the voltage at both ends of the load. In order to avoid overload damage to the triode inductive load circuit, the traditional solution is to replace the triode Q1 with a MOS transistor with short-circuit protection function, or add a coil current sampling circuit to sample the voltage at both ends of the load, and trigger overload protection when the sampling voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26
CPCG01R31/2608
Inventor 王川李飞姚欣
Owner 河南嘉晨智能控制股份有限公司