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Fault detection circuit and method for detecting circuit failure by using fault detection circuit

A fault detection circuit and fault technology, applied in electronic circuit testing, circuit devices, emergency protection circuit devices, etc., can solve problems such as failure to detect electronic device faults, and achieve the effect of simple structure and low cost

Inactive Publication Date: 2015-08-26
ZHANJING TECH SHENZHEN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pulse sequence signal is generally composed of high and low potentials. Therefore, traditional constant current detection devices (such as DC ammeters) or constant voltage detection devices (such as DC voltmeters) have been unable to detect alternating high and low potentials. failure of electronic devices driven by pulse train signals

Method used

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  • Fault detection circuit and method for detecting circuit failure by using fault detection circuit
  • Fault detection circuit and method for detecting circuit failure by using fault detection circuit
  • Fault detection circuit and method for detecting circuit failure by using fault detection circuit

Examples

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no. 1 example

[0020] See figure 1 , the fault detection circuit 100 of the first embodiment of the present invention includes a microprocessor 10, a driver 20 connected to the microprocessor 10, a load 30 driven by the driver 20, and a load 30 connected to the microprocessor 10 Comparator 40 between.

[0021] The microprocessor 10 includes at least one output terminal 11 , at least one input terminal 13 , a PWM (Pulse Width Modulation) module 12 and a detection module 14 inside the microprocessor 10 .

[0022] The PWM module 12 outputs a first pulse sequence signal from the output terminal 11 of the microprocessor 10 to trigger the driver 20 to drive the load 30 to work. In this embodiment, the PWM module 12 outputs the first pulse sequence signal to trigger the driver 20 to output the second pulse sequence signal.

[0023] The first pulse sequence signal output by the PWM module 12 is a square wave sequence signal with a volt value of U and a period of T (such as figure 2 ). The duty ...

no. 2 example

[0036] See image 3 , the comparator 40 also includes an anti-jamming circuit module 50 . The anti-jamming circuit module 50 includes a first resistor 51 , a second resistor 52 and a Zener diode 53 .

[0037] One end of the first resistor 51 is connected to the negative pole of the load 30 , and the other end of the first resistor 51 is connected to the non-inverting input end 41 of the comparator 40 . One end of the second resistor 52 is connected to the other end (non-inverting input end 41 ) of the first resistor 51 , and the other end of the second resistor 52 is connected to the output end 43 of the comparator 40 . The anode of the Zener diode 53 is connected to a ground terminal, and the cathode of the Zener diode 53 is connected to the output terminal 43 of the comparator 40 .

[0038] Figure 4 The second sequence signal U taken out from the output terminal 43 of the comparator 40 in the first embodiment is shown in 0 And the second sequence signal U taken out from...

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Abstract

A fault detection circuit includes a micro processing unit configured to output a first pulse width modulation (PWM) signal, a driver electrically coupled to the micro processing unit, and a comparator configured to electrically connect the micro processing unit and the driver. The first PWM signal is configured to drive the driver to output a second PWM signal configured to drive the electrical device. The comparator is configured to compare the second PWM signal with a reference level to output a third PWM signal to the micro processing unit. The third PWM signal contains a number of high level signals and low level signals. The micro processing unit is configured to detect the number of the high level signals and the number of the low level signals during at least one time period to determine a status of an electrical device.

Description

technical field [0001] The invention relates to a circuit structure, in particular to a fault detection circuit of an electronic device driven by a PWM (Pulse Width Modulation) signal and a method for using the fault detection circuit to detect a circuit fault of an electronic device driven by a PWM signal. Background technique [0002] Traditional electronic devices are generally driven by a constant current, and their faults can be detected by a DC ammeter or a voltmeter. However, in order to be used in different occasions, an electronic device driven by a pulse sequence signal with an adjustable duty ratio is usually designed so that the electronic device can work in different states according to different occasions. The pulse sequence signal is generally composed of high and low potentials. Therefore, traditional constant current detection devices (such as DC ammeters) or constant voltage detection devices (such as DC voltmeters) have been unable to detect alternating hi...

Claims

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Application Information

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IPC IPC(8): G01R31/28
CPCH02H3/00H02H3/50H02H3/04
Inventor 陈源庆
Owner ZHANJING TECH SHENZHEN
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