A fast detection method for determining the short circuit of electronic devices in parallel circuits
A detection method and technology of electronic devices, applied in the field of electronics, can solve problems such as the inability to determine the location of short-circuit resistance, equipment or systems not working properly, and circuit short-circuits
Active Publication Date: 2022-04-12
FUDAN UNIV
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Problems solved by technology
Due to improper welding and installation or during use, it will inevitably cause damage to one or several parallel devices, resulting in a short circuit and making the entire device or system unable to work normally.
[0003] In a resistor parallel circuit, if a resistor is short-circuited, the position of the short-circuit resistor cannot be determined with a multimeter
For circuits that are connected in parallel with inductors or capacitors or mixed in parallel with resistors, capacitors, and inductors, the multimeter cannot be used, because measuring the inductance with a multimeter is a short circuit.
Other measurement methods require special instruments and the detection process is cumbersome. It takes a long time to determine the location of the short-circuit device, and the efficiency of determining the short-circuit location of large-scale parallel devices is low.
Method used
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[0015] see figure 1 , for a circuit in which resistors, capacitors, and inductors are mixed in parallel, if one or several devices are short-circuited, the specific detection and determination methods are as follows:
[0016] First, choose an LCR digital bridge, set the parameters to the impedance Z measurement file, and select 1KHz as the frequency.
[0017] Secondly, use the two measurement leads of the LCR digital bridge to figure 1 Connect the A and B terminals of the A and B terminals to the C and D terminals, and test the impedance Z at both ends AB and Z CD The specific value can be read from the display screen of the LCR digital bridge. If Z AB CD , indicating that A and B terminals are close to the short-circuit device, then start from A and B terminals to quickly or leapfrogly move the measuring point, and find the minimum impedance point according to the trend of impedance decrease, at this time, the position of the short-circuit device is between the two meas...
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The invention belongs to the field of electronic technology, in particular to a detection method for quickly determining the short circuit of an electronic device in a parallel circuit. The invention utilizes the LCR digital bridge impedance file to measure the impedance of the parallel circuit, and the minimum impedance point is the position of the short-circuit device in the circuit; the parallel circuit is a circuit in which multiple pure resistances, multiple pure capacitors or multiple pure inductances are connected in parallel , or a mixed parallel circuit of resistors, capacitors, and inductors, or other parallel circuits that can determine whether a device is short-circuited or not by impedance. The invention has fast detection speed and is not limited by the number and types of parallel devices.
Description
technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a detection method for a short circuit of an electronic device. Background technique [0002] In various electronic circuits, different numbers and types of electronic components will be used in parallel, especially for some circuits that use parallel devices on a large scale, such as a large number of transducers used in electromagnetic wave or sound wave transmission or reception. Parallel connection, parallel connection of LED lights, etc., sometimes thousands of devices of the same or different types are used in parallel. Due to improper welding and installation or during use, it will inevitably cause damage to one or several parallel devices, resulting in a short circuit and making the entire device or system unable to work normally. [0003] In a resistor parallel circuit, if a resistor is short-circuited, the position of the short-circuit resistor cannot b...
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IPC IPC(8): G01R31/52
Inventor 马建敏
Owner FUDAN UNIV