KR20000009845U - Short circuit and open detection device of circuit - Google Patents

Abstract

end. TECHNICAL FIELD OF THE INVENTION

It is a technique regarding the detection apparatus of various electrical elements and circuits.

I. The technical problem the invention seeks to solve

A technique is disclosed for an apparatus capable of easily and conveniently detecting a short circuit or an opening of a circuit.

All. Summary of solution of design

The present invention is a device for detecting the opening and short circuit of the circuit, having a terminal for supplying power to the target circuit to be inspected state and a terminal connected to the common ground, through the two terminals to detect the resistance value of the circuit through the voltage value And a reference value setting section for variably setting the reference resistance value by the detector and changing the set reference resistance value to a voltage value, and outputting the voltage value output from the detection section and the reference value setting section. Comparing unit for comparing the voltage value to output the difference voltage, and different lamps are driven according to the case that the difference voltage value output from the comparison unit is the open state of the circuit and the short circuit state of the circuit to be tested It is composed of an alarm unit for short circuit and open status.

la. Important uses of the devise

It is used to detect short circuits and open states of circuits using various electrical and electronic devices.

Description

Short circuit and open detection device of circuit

The present invention relates to a detection device for checking the state of the element used in the circuit, and more particularly to a detection device for detecting the short circuit and open state of the circuit.

In general, many electronic devices are mounted on a PCB (Patten Copy Board) substrate to form an electronic product. In addition, the devices used in the electronic products are often using an integrated circuit semiconductor device, and when mounted on the substrate, most of the devices are drilled in the place where the elements of the substrate will be located and the pins of the elements are fixed by soldering through the holes. . Recently, when electronic devices are installed on a PCB, they are mounted on the PCB by using an automated device. However, in the course of designing the product, the experiment is usually done manually. In particular, in the completion stage of the product, since the elements must be arranged on the same board as the actual product to be sold, sophisticated technology is required for soldering. Therefore, due to the high degree of integration of the substrate, the mounting of the next device may be performed when the devices mounted are shorted or opened. Therefore, when soldering a board, designers repeatedly check the short circuit and the open circuit until assembly is completed to check whether a short circuit or an open element exists in the circuit. At this time, the short circuit test sets the expected resistance value of the circuits and measures several times using a resistance meter. Then, the tolerance range of the resistance value is calculated or predicted, and the next device is mounted only when the resistance value is within the tolerance range. Therefore, when mounting the devices on the PCB substrate, there was a difficulty in the inspection of short circuit and opening.

Therefore, an object of the present invention is to provide a detection device for inspecting the short circuit and open state of the elements of the PCB substrate.

The present invention for achieving the above object is a device for detecting the opening and short circuit of the circuit, having a terminal for supplying power to the target circuit to be inspected state and a terminal connected to the common ground and through the two terminals of the circuit A detector which detects a resistance value and outputs it as a voltage value, a reference value setting unit that changes and outputs a reference resistance value set by the detector to a voltage value, a voltage value output from the detection unit and a voltage output from the reference value setting unit A comparator for comparing the values and outputting a differential voltage, and driving different lamps according to a case where the difference voltage value output from the comparator is an open state of a circuit and a short circuit of a circuit. It is characterized by consisting of an alarm unit for notifying the short circuit and the open state.

1 is a block diagram for detecting a short circuit according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram for short circuit detection according to the present invention. The detector 10 includes two lead terminals A and B for measuring resistance values of devices mounted on the PCB, one lead terminal being grounded to a common ground on the PCB board, and the other lead terminal supplies power. To measure the resistance of the PCB circuit. In addition, the detector 10 converts the resistance values inspected through the two lead stages into voltage values and outputs them to the comparator 20. In addition, the reference value setting unit 40 is configured to allow the user to set the expected resistance value of the circuit board, and converts the resistance value set by the user to a voltage value and outputs the comparator 20. Then, the comparator 20 compares the resistance value converted into the voltage value received from the detector 10 and the voltage value output from the reference value setting unit 40. In addition, the comparator 20 compares the two voltage values and outputs the difference between the two voltage values to the alarm unit 30. The alarm unit 30 detects whether the difference voltage value received from the comparator 20 is within a tolerance range through a comparison circuit provided therein. The comparison circuit provided in the alarm unit 30 may use a window comparator. In addition, the alarm unit 30 drives an visible circuit (not shown in FIG. 1) configured as a light emitting lamp when the voltage value output from the comparator 20 is a voltage value at the time of short circuit of the PCB board, and at the same time, generates an audible sound The circuit (not shown in Fig. 1) can be driven to confirm the short circuit state of the substrate with visible and audible information. On the contrary, when the difference voltage value received from the comparator 20 is not the voltage value of the open state of the PCB, another open circuit (not shown in FIG. 1) configured as a light emitting lamp is driven to indicate the open state. In this case, the color of the lamp that is emitted when the PCB board is in the short state and the open state is configured differently so that the state of the circuit can be distinguished by the color of the lamp. In addition, when the audible circuit further includes an audible circuit that outputs an alarm sound according to a short state and an open state, the audible circuit may detect the same even when the circuit is opened. The power supply unit 50 supplies operation power for operation to the detector 10, the comparator 20, the alarm unit 30, and the reference value setting unit 40.

As described above, when the device is mounted on the PCB board required for the fabrication of the circuit or the verification of the design, the circuit board can be easily inspected because the status of the mounted PCB can be confirmed by visual or audible information. .

Claims (7)

In the device for detecting a short circuit, A detection unit having a terminal for supplying power to a target circuit to be inspected and a terminal connected to a common ground, and detecting a resistance value of the circuit through the two terminals and outputting it as a voltage value; A reference value setting unit for changing and outputting the reference resistance value set by the detector into a voltage value; A comparison unit for comparing the voltage value output from the detection unit with the voltage value output from the reference value setting unit and outputting a difference voltage; And an alarm unit for outputting visible information by driving a lamp circuit when the output value of the comparator is in a short circuit state by checking whether the output value is a short circuit state of the circuit. According to claim 1, wherein the alarm unit, And an audible circuit for outputting an alarm state with an audible sound in the case of a short circuit state of the circuit. In the device for detecting the opening of the circuit, A detection unit having a terminal for supplying power to a target circuit to be inspected and a terminal connected to a common ground, and detecting a resistance value of the circuit through the two terminals and outputting it as a voltage value; A reference value setting unit for changing and outputting the reference resistance value set by the detector into a voltage value; A comparison unit for comparing the voltage value output from the detection unit with the voltage value output from the reference value setting unit and outputting a difference voltage; And an alarm unit for outputting visible information by driving a lamp circuit when the output value of the comparator unit is in an open state by checking whether the output value of the comparator is in an open state. According to claim 3, The alarm unit, And an audible circuit for outputting an alarm state with an audible sound when the circuit is in an open state. In the device for detecting the opening and short circuit of the circuit, A detection unit having a terminal for supplying power to a target circuit to be inspected and a terminal connected to a common ground, and detecting a resistance value of the circuit through the two terminals and outputting it as a voltage value; A reference value setting unit for changing and outputting the reference resistance value set by the detector into a voltage value; A comparison unit for comparing the voltage value output from the detection unit with the voltage value output from the reference value setting unit and outputting a difference voltage; And an alarm unit which notifies the short circuit and the open state of the test target circuit by driving different lamps according to the case where the difference voltage value output from the comparison unit is an open state of the circuit and a short circuit state of the circuit. Short and open detectors. The method of claim 5, Short circuit and open detection device, characterized in that the different lamps of the alarm unit emits light in different colors when emitting light. The method according to claim 5 or 6, wherein the alarm unit, And an audible circuit for outputting a warning sound when the detection subject circuit is shorted or opened.