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Floating power supply detecting circuit of ignition circuit

A technology for detecting circuits and ignition circuits, applied in electronic circuit testing, measuring electricity, measuring devices, etc., can solve the problems affecting the reliability of ignition circuits, complex circuits and strong switching noise, etc., to reduce the number and types, improve reliability, The effect of simplifying the circuit

Active Publication Date: 2012-02-01
中国航天科工集团第二研究院二一〇所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the prior art that affect the reliability of the ignition circuit, the circuit is complex and there is strong switching noise, the present invention provides a floating power supply detection circuit for the ignition circuit, which can greatly improve the safety of the ignition circuit during the detection process and simplify the circuit. Reduced circuit cost and improved circuit reliability

Method used

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  • Floating power supply detecting circuit of ignition circuit
  • Floating power supply detecting circuit of ignition circuit
  • Floating power supply detecting circuit of ignition circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0016] For a certain type of ignition circuit, it is known that the external working power supply voltage is 5V, and the charging power supply is 27V. The task requires that there should be no third DC power supply higher than 5V in the ignition circuit except the power supply in the above state. The voltage collected by the detection circuit is 0V, 5V and 27V. The test output value of the detection circuit is collected by the control circuit only when the input terminal is 0V and 5V. When the input terminal is 27V, the test output value is not collected by the control circuit. collection.

[0017] For the above situation, the present invention can be adopted to supply power to the detection circuit (see image 3 ), when the ignition circuit is in the detection state, the comparator LM139 is powered by the 5V working power supply through the diode V1 (model 1N4148), when the ignition circuit is in the ignition charging state, the 27V power supply at the charging end passes thr...

Embodiment 2

[0019] For a certain type of ignition circuit, it is known that the external working power supply voltage is 5V, and the charging power supply is 27V. The task requires that there should be no third DC power supply higher than 5V in the ignition circuit except the power supply in the above state. like Figure 4 As shown, the detection circuit collects three kinds of voltages: 0V, 5V and 27V. When the detection circuit input is 0V, 5V and 27V, the test output value is collected by the control circuit. When the ignition circuit is in the detection state, the 5V working power supply supplies power to the comparator LM139 through the field effect transistor V3 (model IRF3205SR). When the ignition circuit is in the ignition charging state, the 27V power supply at the charging end passes through the field effect transistor V4 (The model is IRF3205SR) to supply power to the comparator, so that the voltage at the power supply terminal of the comparator is always greater than the volta...

Embodiment 3

[0021] For a certain type of sensor circuit, it is known that the externally detected voltage signals are 5V signal, 12V signal and 28V signal. The detection circuit needs to switch to provide different voltage power supply for the circuit according to the difference of the externally detected voltage signal. like Figure 5 As shown, when the detection voltage signal is 5V, give signal 3 a high level of 5V, and a power supply of 9V supplies power to the circuit through the field effect transistor V5 (model IRF3205SR); when the detection voltage signal is 12V, give signal 4 a high level 5V, power supply 2 15V supplies power to the circuit through FET V6 (model IRF3205SR); when the detection voltage signal is 28V, give signal 5 high level 5V, power supply 2 30V supplies circuit through FET V7 (model IRF3205SR) powered by. In this way, the function of power supply switching is completed.

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Abstract

The invention discloses a floating power supply detecting circuit of an ignition circuit. A 5V working power source and a 0 / 5 / 27V charging end power source supply power for a comparator, the working power source is connected with the anode of a diode V1, the cathode of the diode V1 is connected with a VCC (Virtual Channel Connection) positive pin of the comparator, the charging end power source is connected with the anode of a diode V2, the cathode of the diode V2 is connected with the VCC positive pin of the comparator, and the grounds of the two power sources are connected to a VCC negativepin of the comparator; the working power source is connected to one end of a resistor R4, the other end of the resistor R4 is connected to a reverse input end of the comparator and one end of a resistor R5, the other end of the resistor R5 is connected to the grounds of the power sources, the working power source is connected with one end of a resistor R6, and the other end of the R6 is connectedto an output end of the comparator. The invention has the advantages of greatly improving the safety of the ignition circuit in the detection process, simplifying the circuit, reducing the cost of the circuit and improving the reliability of the circuit.

Description

technical field [0001] The invention relates to a circuit power supply floating switching technology. Background technique [0002] The engine ignition circuit is generally composed of a control circuit, a drive circuit, an ignition circuit, a detection circuit, an auxiliary power supply, an igniter, etc. (see the block diagram of the ignition circuit figure 1 ). The detection circuit is used to detect whether the ignition circuit and the igniter are working normally (see the circuit diagram for the working principle of the detection circuit figure 2 ), the detection circuit is mainly composed of comparators. Since the voltage collected by the input terminal of the comparator is 0V, 5V and 27V, the test output value of the detection circuit is collected by the control circuit only when the input terminal is 0V and 5V. When the input terminal is 27V, the test output value is not collected by the control circuit. The ignition circuit provides two kinds of power supply ext...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/28
Inventor 孙柯王省科何军
Owner 中国航天科工集团第二研究院二一〇所
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