An electronic control board fault feedback time detection device

Abstract

The present invention discloses a device for detecting the fault feedback time of an electronic control board. The electrical output end of the electronic control board is connected to the electrical input end of a fault generator, and the signal acquisition end of the electronic control board is connected to the signal output end of the fault generator. A manual switch is connected between the electrical output end of the electronic control board and the electrical input end of the fault generator. The positive terminal of a DC power supply, a voltage dividing resistor, a feedback output passive contact, and the negative terminal of the DC power supply form a feedback loop. The negative terminal of the DC power supply, the reference voltage terminal of the electronic control board, and the reference voltage terminal of an oscilloscope are commonly connected to ground. The A channel of the oscilloscope is electrically connected between the signal acquisition end of the electronic control board and the signal output end of the fault generator, and the B channel of the oscilloscope is electrically connected between the voltage dividing resistor and the feedback output passive contact. The present invention can achieve time detection at the millisecond level by using the time difference between the waveform jumps of different channels in the oscilloscope.

Description

Technical Field

[0001] The present invention relates to the field of cold liquid machine fault parameter detection devices, and specifically to an electronic control board fault feedback time detection device. Background Art

[0002] The main function of a cold liquid machine is to provide a circulating coolant, that is, a cooling liquid, with certain temperature, flow rate, and pressure requirements for the object to be cooled. With the rapid development of some high-power radar, laser, cabinet and other equipment in recent years, the requirements for the cold liquid machine as a guarantee equipment are also increasing, such as a perfect fault feedback system. A perfect feedback system not only requires the electronic control board to feedback all faults, but also needs to detect the fault feedback time of the electronic control board, and there are strict requirements for the detection of the electronic control board fault feedback time, such as time detection at the ms level. In the past, when a cold liquid machine failed, only the fault feedback time of the electronic control board could be detected in units of seconds of delay, which could not meet the demanding feedback time detection requirements of equipment such as lasers. Therefore, a fault feedback time detection device capable of achieving millisecond-level detection is needed. Summary of the Invention

[0003] The purpose of the present invention is to provide an electronic control board fault feedback time detection device to solve the problem that the detection of the fault feedback time of the electronic control board in high-power equipment in the prior art cannot reach the millisecond level.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] An electronic control board fault feedback time detection device, the electrical output end of the electronic control board is connected to the electrical input end of a fault generator, and the signal acquisition end of the electronic control board is connected to the signal output end of the fault generator. The electronic control board supplies power to the fault generator and receives the signal output by the fault generator. It is characterized in that: it includes a normally open feedback output passive contact, a manual switch, an oscilloscope, a DC power supply, and a voltage dividing resistor that come with the electronic control board. The manual switch is connected in series between the electrical output end of the electronic control board and the electrical input end of the fault generator. The positive terminal of the DC power supply is sequentially connected to the negative terminal of the DC power supply through the voltage dividing resistor and the feedback output passive contact to form a feedback loop, and the negative terminal of the DC power supply, the reference voltage terminal of the electronic control board, and the reference voltage terminal of the oscilloscope are commonly grounded. The oscilloscope has channel A and channel B. Among them, channel A operates in the signal falling edge trigger mode, and channel B operates in the smooth waveform mode. The A channel of the oscilloscope is electrically connected between the signal acquisition end of the electronic control board and the signal output end of the fault generator, and the B channel of the oscilloscope is electrically connected between the voltage dividing resistor and the feedback output passive contact.

[0006] The device for detecting fault feedback time of an electric control board is characterized in that the fault generator is a parameter detection component in a liquid cooler, and a manual switch is used to manually disconnect the circuit between the electrical output end of the electric control board and the electrical input end of the fault generator to simulate a fault of the fault generator.

[0007] The fault feedback time detection device of an electric control board is characterized in that: the signal acquisition end of the electric control board connected to the fault generator is used as a fault detection point, and the feedback output passive contacts of the electric control board are normally open when the circuit between the electric output end of the electric control board and the electric input end of the fault generator is connected, and are closed when the circuit between the electric output end of the electric control board and the electric input end of the fault generator is disconnected.

[0008] The electric control board fault feedback time detection device is characterized in that the oscilloscope is a dual-channel digital filter of model F123, and the A channel and the B channel of the oscilloscope work at different levels.

[0009] The device for detecting the fault feedback time of an electric control board is characterized in that: channel A in the oscilloscope operates in a falling edge trigger mode, and the level of channel A triggers a waveform jump based on a signal from a signal acquisition end connecting the electric control board and the fault generator; channel B in the oscilloscope operates in a waveform smoothing mode, and the level of channel B triggers a waveform jump when the passive contact of the feedback output is closed.

[0010] The electric control board fault feedback time detection device is characterized in that: the model of the electric control board is JC-10 / P1, and the electric control board includes a single-chip microcomputer and a feedback output relay. The analog input terminal of the single-chip microcomputer in the electric control board is connected to the signal output terminal of the fault generator, and the analog output terminal of the single-chip microcomputer is connected to the coil of the feedback output relay. The normally open contact of the feedback output relay serves as a feedback output passive contact.

[0011] The present invention utilizes the feedback output passive contacts of the electric control board in the high-power equipment, and forms a fault feedback time detection device of the electric control board with an oscilloscope, a DC power supply, a manual switch, a voltage-dividing resistor, etc., and utilizes the time difference of waveform jumps of different channels in the oscilloscope to achieve millisecond-level time detection. Compared with the prior art, the present invention has the following advantages:

[0012] 1. The present invention is provided with a manual switch, which can conveniently and quickly switch between the working mode and the fault mode.

[0013] 2. The present invention is provided with a voltage-dividing resistor and an external DC power supply, which are used to form a voltage loop with the feedback output passive contacts of the electric control board to generate voltage changes before and after a fault.

[0014] 3. The present invention is provided with a high-precision core detection device - an oscilloscope, and the detection voltage and scanning time are adjustable to facilitate time detection of different orders of magnitude, and can achieve time detection at the millisecond level. It has a dual-channel detection function, channel A works in the signal falling edge trigger mode, which is used to capture the sudden drop in voltage at the fault detection point when the fault occurs, and channel B works in the automatic mode of smooth waveform, which is used to output waveform changes with the feedback output of the passive contact voltage. The time difference between the waveform jumps of channels A and B is the fault feedback time. The oscilloscope can save waveform data, and the recording is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural principle diagram of the present invention.

[0016] Figure 2 1 is a circuit diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 As shown, a fault feedback time detection device for an electric control board, wherein the electric output terminal 8 of the electric control board 1 is connected to the electric input terminal 14 of the fault generator 3, the signal acquisition terminal 9 of the electric control board 1 is connected to the signal output terminal 15 of the fault generator 3, the electric control board 1 supplies power to the fault generator 3 and receives the signal output by the fault generator 3, including the normally open feedback output passive contact 7 of the electric control board 1, the manual switch 2, and the oscilloscope 4, the DC power supply 5, and the voltage dividing resistor 6, wherein the manual switch 2 is connected in series between the electric output terminal 8 of the electric control board 1 and the electric input terminal 14 of the fault generator 3, and the positive terminal 16 of the DC power supply 5 is connected in sequence through The voltage-dividing resistor 6, the feedback output passive contact 7 are connected to the negative terminal 17 of the DC power supply 5 to form a feedback loop, and the negative terminal 17 of the DC power supply 5, the reference voltage terminal 10 of the electric control board 1, and the reference voltage terminal 11 of the oscilloscope 4 are connected to the ground. The oscilloscope 4 has an A channel 12 and a B channel 13, wherein the A channel 12 works in a signal falling edge trigger mode, and the B channel 13 works in a smooth waveform mode. The A channel 12 of the oscilloscope 4 is electrically connected between the signal acquisition terminal 9 of the electric control board 1 and the signal output terminal 15 of the fault generator 3, and the B channel 13 of the oscilloscope 4 is electrically connected between the voltage-dividing resistor 6 and the feedback output passive contact 7.

[0019] In the present invention, the fault generator 3 is a parameter detection component in the cold liquid machine, such as a flow meter for flow detection, a thermometer for temperature detection, a press for pressure detection, etc. in the cold liquid machine, and the manual switch 2 manually disconnects the circuit between the electrical output end of the electric control board 1 and the electrical input end of the fault generator 3. When the manual switch 2 is manually disconnected, the power supply from the electric control board 1 to the fault generator 3 is interrupted, and the fault generator 3 stops working, thereby simulating a fault of the fault generator 3.

[0020] In the present invention, the signal collection terminal 10 of the electric control board 1 connected to the fault generator 3 is used as a fault detection point, and the feedback output passive contact 7 of the electric control board 1 is normally open when the circuit between the electric output terminal of the electric control board 1 and the electric input terminal of the fault generator 3 is connected, and is closed when the circuit between the electric output terminal of the electric control board 1 and the electric input terminal of the fault generator 3 is disconnected. Therefore, when the manual switch 2 is manually disconnected, the feedback output passive contact 7 is converted from a normally open state to a closed state.

[0021] In the present invention, the oscilloscope 4 is a dual-channel digital filter of model F123, and the A channel 12 and the B channel 13 of the oscilloscope 4 work at different levels. Specifically, the A channel 12 of the oscilloscope 4 works at a high level of 5V, and the B channel 13 of the oscilloscope 4 works at a high level of 24V. The A channel 12 of the oscilloscope 4 works in a falling edge trigger mode, and the level of the A channel 12 of the oscilloscope 4 triggers a waveform jump based on the signal of the signal acquisition terminal 10 connected to the fault generator 3 by the electric control board 1. The B channel 13 of the oscilloscope 4 works in a waveform smoothing mode, and the level of the B channel 13 of the oscilloscope 4 triggers a waveform jump when the feedback output passive contact 7 is closed.

[0022] That is, when the fault generator 3 fails, the signal acquisition terminal 10 of the electric control board 1 cannot obtain the signal sent by the fault generator 3. At this time, the A channel 12 in the oscilloscope 4 captures the voltage drop of the signal acquisition terminal 10, thereby triggering the waveform jump of the A channel 12, that is, jumping from a high level 5V to 0V. When the electric control board 1 stops supplying power to the fault generator 3, the feedback output passive contact 7 is converted from a normally open state to a closed state, so that the voltage divider resistor 6 is directly grounded through the negative terminal 17 of the DC power supply 5, and the B channel 13 captures the voltage change between the voltage divider resistor 6 and the feedback output passive contact 7 and triggers the waveform jump, that is, jumping from a high level 24V to 0V.

[0023] The time difference between the waveform jumps of channel A 12 and channel B 13 is observed through an oscilloscope. Channel A 12 jumps first and channel B 13 jumps later. This time difference is the fault feedback time of the electric control board.

[0024] In the present invention, the model of the electronic control board 1 is JC-10 / P1. The interior of the electronic control board 1 includes a single-chip microcomputer and a feedback output relay. The analog input terminal of the single-chip microcomputer in the electronic control board is connected to the signal output terminal of the fault generator. The analog output terminal of the single-chip microcomputer is connected to the coil of the feedback output relay. The normally open contact of the feedback output relay serves as the feedback output passive contact. The analog input terminal of the single-chip microcomputer is used to collect external input signals such as flow rate, pressure and other external signals. The single-chip microcomputer processes digital information and completes logical judgment and output. The feedback output relay is used to execute the output command of the single-chip microcomputer. When a fault occurs, a high level is output at the corresponding pin of the single-chip microcomputer, the coil of the feedback output relay is energized, and the normally open contact of the feedback output relay, that is, the feedback output passive contact, is closed.

[0025] In the present invention, by using the waveform holding function in the oscilloscope 4, it is possible to prevent interference from clutter signals when the A channel 12 and the B channel 13 are working, and improve the accuracy of feedback time detection.

[0026] In the present invention, taking the flowmeter with the model LS-A-DN20 as the fault generator 3 as an example, the specific circuit connection structure of the present invention is described as follows Figure 2 as shown:

[0027] The flowmeter BF1 with the model LS-A-DN20 is connected to the analog input terminal AI1 of the electronic control board AP with the model JC-10 / P1; in the analog input terminal AI1, pin 3 and pin 1 are the power input of the flowmeter, and the power + (pin 3) terminal is connected in series with the manual switch SA with the model XB2BD25C. Pin 2 of the analog input terminal AI1 is for collecting the output signal of the flowmeter and converting it into an input of 1-5V to the single-chip microcomputer. This part is the fault acquisition circuit.

[0028] The feedback circuit is composed of a DC power supply U, a power resistor R, and a feedback output relay X3. When the flow is normal, the coil of the feedback output relay X3 is disconnected, the normally open contact (between pin 2 and pin 5) of the feedback output relay X3 is disconnected, and pin 2 of the feedback output relay X3 is at a high level of 24V; when a flow fault occurs, the coil of the feedback output relay X3 is closed, the normally open contact (between pin 2 and pin 5) of the feedback output relay X3 is closed, and pin 2 of the feedback output relay X3 is connected to the power - and is 0V.

[0029] The core component for fault detection is a dual-channel digital filter PS (i.e., an oscilloscope). The test lead of the A channel of the dual-channel digital filter PS is connected to pin 2 of the analog input terminal AI1. The test lead of the B channel of the dual-channel digital filter PS is connected to pin 2 of the feedback output relay X3. The black test lead of the COM terminal of the dual-channel digital filter PS, the common terminal of the feedback output relay X, that is, pin 5, and pin 1 of the analog input terminal AI1 of the electronic control board AP are interconnected respectively, and the three points are at 0V.

[0030] When the manual switch SA is disconnected, the power supply of the flowmeter BF1 is cut off, the output of BF1 drops, and the voltage at pin 2 of the analog input terminal AI1 of the electronic control board triggers a falling edge. This falling edge is detected by channel A, and the moment of the falling edge is the fault occurrence time point. The voltage at pin 2 of the feedback output relay X3 is 24V when the flow is normal and 0V when the flowmeter fails. The moment when the voltage drops from 24V to 0V is the fault feedback time point, which is detected by channel B. The difference between the time points of the falling edges of the voltages of channels A and B is the fault feedback time.

[0031] The embodiments described in the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various variations and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. An electronic control board fault feedback time detection device, wherein the electrical output end of the electronic control board is connected to the electrical input end of a fault generator, and the signal acquisition end of the electronic control board is connected to the signal output end of the fault generator. The electronic control board supplies power to the fault generator and receives the signal output by the fault generator. It is characterized in that: It includes a normally open feedback output passive contact, a manual switch, an oscilloscope, a DC power supply, and a voltage divider resistor, wherein the manual switch is connected in series between the electrical output terminal of the electrical control board and the electrical input terminal of the fault generator, the positive terminal of the DC power supply is connected to the negative terminal of the DC power supply through the voltage divider resistor and the feedback output passive contact in sequence to form a feedback loop, and the negative terminal of the DC power supply, the reference voltage terminal of the electrical control board, and the reference voltage terminal of the oscilloscope are grounded in common, the oscilloscope has an A channel and a B channel, wherein the A channel works in a signal falling edge trigger mode, and the B channel works in a smooth waveform mode, the A channel of the oscilloscope is electrically connected between the signal acquisition terminal of the electrical control board and the signal output terminal of the fault generator, and the B channel of the oscilloscope is electrically connected between the voltage divider resistor and the feedback output passive contact; The fault generator is a parameter detection component in the liquid cooler, and the circuit between the electrical output end of the electric control board and the electrical input end of the fault generator is manually disconnected by a manual switch to simulate a fault of the fault generator; The signal collection end of the electric control board connected to the fault generator serves as a fault detection point. The feedback output passive contacts of the electric control board are normally open when the circuit between the electric output end of the electric control board and the electric input end of the fault generator is connected, and are closed when the circuit between the electric output end of the electric control board and the electric input end of the fault generator is disconnected.

2. The time detection device for feedback of electronic control board faults according to claim 1, characterized in that: The oscilloscope is a dual-channel digital filter of model F123, and the A channel and the B channel of the oscilloscope work at different levels.

3. An electronic control board fault feedback time detection device according to claim 1 or 2, characterized in that: Channel A in the oscilloscope works in a falling edge trigger mode, and the level of channel A is based on the signal trigger waveform jump of the signal acquisition end connected between the electric control board and the fault generator; The B channel in the oscilloscope works in waveform smoothing mode, and the level of the B channel triggers waveform jump when the feedback output passive contact is closed.

4. A detection device for the failure feedback time of an electronic control board according to claim 1, characterized in that: The model of the electric control board is JC-10 / P1, and the electric control board includes a single-chip microcomputer and a feedback output relay. The analog input terminal of the single-chip microcomputer in the electric control board is connected to the signal output terminal of the fault generator, and the analog output terminal of the single-chip microcomputer is connected to the coil of the feedback output relay. The normally open contact of the feedback output relay serves as a feedback output passive contact.

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