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Control board with test function

A control board and control circuit technology, applied in the direction of electrical testing/monitoring, digital circuit testing, electronic circuit testing, etc., can solve the problems of difficult testing, low versatility, high cost, etc., to reduce the difficulty of testing, eliminate self- The effect of zero drift and improving test efficiency

Active Publication Date: 2019-05-21
DAYU ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the specially built test bench is not only expensive, but also has complicated connection lines, and its versatility is not high. Different series of control boards need to be equipped with different needle beds or signal sources.
Therefore, in the process of mass production of frequency converters, the existing control board production test method is inefficient and difficult to test
[0004] In addition, when the control board is separated from the FCT test bench, it cannot be tested. If the control board is assembled in the inverter and there is a fault, the fault cannot be predicted in advance before operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: a kind of control board with testing function, see figure 1 As shown, including MCU, analog conditioning circuit, switching input circuit, switching output circuit, 4-20mA input circuit and 4-20mA output circuit, MCU is connected with analog conditioning circuit, switching input circuit, switching output circuit respectively , The 4-20mA input circuit is electrically connected with the 4-20mA output circuit, and the analog quantity conditioning circuit is used to process the input analog quantity signal, and outputs a voltage signal of 0-3V to the MCU; the control board also includes a first switching control circuit, the second switching control circuit, the third switching control circuit and the reference voltage circuit, the input terminals of the first switching control circuit, the second switching control circuit and the third switching control circuit are all connected with the control signal output terminal of the MCU, and the reference voltage Th...

Embodiment 2

[0045] Embodiment 2: on the basis of embodiment 1, refer to figure 2 As shown, the first switching control circuit, the second switching control circuit and the third switching control circuit all include a selection signal receiving terminal A0, a selection signal receiving terminal A1, a NOT gate U1A, a NOT gate U1B, a NOT gate U1C, a NOT gate U1D, NAND gate U2A, NAND gate U2B, NAND gate U2C, the first switching channel, the second switching channel and the third switching channel, the selection signal receiving end A0 and the selection signal receiving end A1 are used to receive the channel sent by the MCU Select a signal.

[0046] The input end of the NOT gate U1A is connected to the selection signal receiving end A0, the output end of the NOT gate U1A is connected to the input end of the NOT gate U1B; the input end of the NOT gate U1C is connected to the selection signal receiving end A1, and the output end of the NOT gate U1C Connect to the input of the NOT gate U1D. ...

Embodiment 3

[0056] Embodiment 3: on the basis of embodiment 2, refer to figure 2 As shown, a voltage dividing resistor R2 is connected between the b-pole and the e-pole of the triode Q1 to stabilize the voltage difference (about 0.7V) between the b-pole and e-pole of the triode Q1, so as to ensure that the triode Q1 can reliably conduct Pass.

[0057] Based on the same principle, a voltage dividing resistor R5 is connected between the b pole and the e pole of the transistor Q3, and a voltage dividing resistor R8 is connected between the b pole and the e pole of the transistor Q5, which are used to stabilize the b poles of the transistors Q3 and Q5 respectively. The pressure difference between pole and e.

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Abstract

The invention discloses a control board with a test function, which relates to the technical field of circuit test. The control board comprises a first switching control circuit, a second switching control circuit, a third switching control circuit and a reference voltage circuit. The reference voltage circuit is used to generate positive reference voltage and negative reference voltage. The control terminals of the first switching control circuit, the second switching control circuit and the third switching control circuit are all connected with the control signal output terminal of an MCU. By adding the three switching control circuits and using the MCU to send control signals, the control board of a frequency converter also has a test function, the test efficiency of the frequency converter control board can be improved, the test difficulty is also reduced, the control board assembled in the frequency converter can also be tested, whether hidden fault dangers exist in the control board can be tested before operation of the frequency converter, and safety operation of the frequency converter is facilitated.

Description

technical field [0001] The invention relates to the technical field of circuit testing, in particular to a control board with a testing function. Background technique [0002] The inverter control board is the control center of the entire inverter and also the core unit of the inverter. Its reliability directly determines the stability of the inverter. In order to improve the reliability of the control board, the FCT test (Forwarders Certificate of Transport, functional test) of the circuit board is generally carried out in the factory test. The FCT test requires a special test bench, supporting power supply, external signal source, needle bed, PLC (Programmable Logic Controller, programmable logic controller) or industrial computer and other equipment. [0003] At present, the specially built test bench is not only expensive, but also has complicated connection lines, and its versatility is not high. Different series of control boards need to be equipped with different nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02G01R31/01G01R31/317
Inventor 李崇波邹缙肖少兵王怡华王琴陈志国
Owner DAYU ELECTRIC
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