KR19990085984A - Charge test circuit of capacitor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge test circuit of a capacitor, in particular a voltage supply controller (3) for selectively supplying voltage to the rectifier (1), the constant voltage rectifier (2) and the first switching unit (6), for charging a capacitor A first switching unit 6 for selectively passing a voltage input through the voltage sensing unit 4 and the capacitor charging voltage sensing unit 4, a clock signal generating unit 8, and a reset signal generating unit 9 ), An abnormal current detection unit 10 for detecting when an overcurrent flows to the jig 13 to which several test capacitors are bitten, a control signal generator 11 for generating a control signal to the second switching unit, and the control It consists of a second switching unit 7 which is switched in response to the output signal of the signal generating unit 11 and a light emitting diode LED4 for detecting abnormal current detection. If a fault occurs in any of the condensed capacitors, By allowing the charging voltage to be applied to the jig to be automatically cut off, the overcurrent flowing into the bad capacitor may affect other capacitors, the body may explode, and consequently the adjacent capacitors may be cascaded or tested. Damage to the equipment itself and severe fires can be prevented in advance. Jig with a bad capacitor can be easily identified with the naked eye. Capacitors with different charging rated voltages can be inspected with one tester. This can significantly reduce the test cost of the capacitor, the installation cost of the equipment, and the installation space.

Description

Charge test circuit of capacitor

The present invention relates to a charging test circuit of a capacitor, and more particularly, in a capacitor tester for checking whether or not a defect of capacitors bite by each jig is moved while moving several jigs that can ask several capacitors at a time. If a failure occurs in any one or more of the capacitors in the jig, the charging voltage applied to the jig is cut off to prevent overcurrent flow and explode. The explosion of capacitors affects adjacent capacitors, which can prevent cascading explosions, damage to the test equipment itself, including substrates, or fire that can occur in severe cases. It is possible to visually check whether the condenser bit is bad or not. It is invented so that different capacitors can be tested with one tester.

Conventional condenser testers have a configuration in which several capacitors (for example, 20) are buried in each jig, and a predetermined charging voltage is supplied unconditionally, so that if one of several capacitors installed on one jig is defective, When over current flows, it cannot cut off the charging voltage supplied to this jig.

Therefore, as described above, a failure occurs in any one of the capacitors tested in each jig and the overcurrent flows to the capacitors, so that the charging current does not flow to the other capacitors in the parallel connection state. In addition to the possibility of a failure, overcurrent flows to the defective capacitors as described above, and there is a risk of explosion due to overcharging. In addition, when any one of several capacitors explodes, the adjacent capacitors are affected. In addition, there is a risk of chain explosion, as well as damage to the test equipment itself, including the substrate, and even a fire may occur.

In addition, there is a problem in that the test cost of the capacitor is high because each of the tests according to the charging rated voltage of the capacitor to be inspected separately.

The present invention has been made to solve the above-mentioned problems, the first object of the present invention is that when a failure occurs in any one of the capacitors that are bitten by several jigs that can inquire several capacitors at once. The present invention provides a charging test circuit for a capacitor that can block an applied charging voltage to prevent other capacitors from being affected.

The second object of the present invention is to prevent overcurrent flow and explode in a defective capacitor, as well as affect the adjacent capacitors due to the explosion of the defective capacitor, such as a chain explosion or a test device itself. It is to provide a charging test circuit of a capacitor which can prevent the damage and the serious fire that can occur.

The third object of the present invention is to provide a charging test circuit of a capacitor which can visually check the jig when a predetermined capacitor is inferior to any one of several jigs in which several capacitors are respectively held. have.

A fourth object of the present invention is to provide a test circuit for a capacitor that can significantly reduce the test cost of the capacitor, the installation cost of the equipment and the installation space by allowing the capacitors having different charging rated voltages to be inspected by a single tester. have.

The object of the present invention is to rectify the output voltage of the transformer for lowering the commercial voltage to a low AC voltage to rectify the predetermined DC voltage to supply to the first switching unit; A constant voltage rectifier for rectifying the AC voltage output from the transformer into a constant DC voltage and supplying the voltage to a driving voltage of each part; A voltage supply controller for selectively supplying the output voltage of the rectifier to the first switching unit according to a control signal output from the main controller in response to the charging rated voltage of the capacitor to be tested; A capacitor charging voltage sensing unit for directly supplying a capacitor charging voltage applied from a power supply unit to the test capacitors selectively fed to the jig through the first switching unit; A first switching unit for selectively passing a voltage input through the capacitor charging detection unit; A clock signal generator for generating clock pulses at predetermined time intervals under the control of the main controller; A reset signal generator for generating reset signals at predetermined time intervals under the control of the main controller; An abnormal current detector for outputting predetermined data to the control signal generator when an overcurrent flows in a jig into which several capacitors are bitten; When predetermined data is output from the abnormal current detector or a predetermined signal is generated from the reset signal generator, a control to output a corresponding control signal to the second switching unit at a time interval of the clock pulse generated from the clock signal generator. A signal generator; And a second switching unit which determines whether to supply the charging voltage supplied through the first switching unit or the capacitor charging voltage sensing unit to the test capacitors by performing a switching function corresponding to the output signal of the control signal generator. This can be achieved by

Therefore, when a failure occurs in any one of the capacitors that are bitten by several jigs that can ask several capacitors at a time, the charging voltage applied to the jig is automatically cut off, so that the overcurrent flowing through the defective capacitor is different. It is possible to prevent the impact on the capacitor and to cause the overcurrent flow to the defective capacitor and to explode as well as to cause the capacitor to cascade or damage the test equipment itself, including the substrate, and to cause severe damage. The fire can be prevented in advance, and the inspector can easily check the jig in which the bad capacitor is bite during the test of the capacitor, and can test the capacitors with different charging rated voltages with a single tester. It can greatly reduce installation cost and installation space of equipment and equipment.

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

1 is a circuit diagram of the present invention.

Explanation of symbols on main parts of drawing

1: rectifier 2: constant voltage rectifier

3: voltage supply control unit 4: capacitor sensing voltage sensing unit

5: power supply unit 6,7: first and second switching unit

8: Clock signal generator 9: Reset signal generator

10: abnormal current detection unit 11: control signal generator

12: main control roll 13: jig

1 shows a circuit diagram of the present invention, which is composed of a bridge diode (BD1) and a smoothing capacitor (C1), the output of the transformer (T) for lowering the commercial voltage input through a general power line to a low AC voltage A rectifier 1 for rectifying the voltage to a predetermined DC voltage and supplying the voltage to the first switching unit 6;

A constant voltage rectifier (2) comprising a bridge diode (BD2), a capacitor (C2-C5) and a regulator (IC1) to rectify the AC voltage output from the transformer (T) to a constant DC voltage and supply it to the driving voltage of each part (2). Wow;

It consists of a protection resistor (R1), a light emitting diode (LED1) and a photo coupler (PT1) of the rectifier (1) according to the control signal output from the main control unit 12 in response to the charging rated voltage of the capacitor to be tested. A voltage supply controller 3 for selectively supplying an output voltage to the first switching unit 6;

It is composed of series resistors (R2, R3) and the connector (41) for the test of the capacitor charging voltage applied from the power supply unit (5) selectively through the first switching unit (6) or in the jig (13) A capacitor charging voltage sensing unit 4 which directly supplies the capacitors C₁-Cn;

Two transistors Q1 and Q2, base bias voltage supply resistors R4 and R5, and reverse current blocking diode D1 selectively select the voltage input through the capacitor charging voltage detector 4. A first switching unit 6 passing therethrough;

It consists of several resistors (R6-R9), a light emitting diode (LED2), a photo coupler (PT2), a capacitor (C6, C7), a reverse current blocking diode (D2) and an inverter (IN1). A clock signal generator 8 for generating clock pulses at predetermined time intervals under the control of 12);

It consists of several resistors (R10-R13), light-emitting diodes (LED3), photocouplers (PT3), condensers (C8, C9) and inverters (IN2) and is controlled by the main controller 12 at predetermined time intervals. A reset signal generator 9 for generating a reset signal;

It consists of several resistors (R14-R16), diodes (D3, D4), variable resistor for abnormal current setting (VR), capacitor (C10), transistor (Q6) and inverter (IN3). An abnormal current detector 10 which detects when an overcurrent flows to the bites 13 and outputs predetermined data to the control signal generator 11;

Under the control of the clock pulse generated by the clock signal generator 8 and set when the predetermined data is output from the abnormal current detector 10, and when the predetermined signal is generated by the reset signal generator 9 A control signal generator 11 to be reset;

The first switch is composed of several resistors R17-R21, a reverse current blocking diode D5, and transistors Q7-Q9 to perform a switching action corresponding to the output signal of the control signal generator 11. To the second switching section 7 which determines whether to supply the charging voltage supplied to the test capacitors C₁-Cn through the section 6 or directly through the capacitor charging voltage sensing section 4. What constitutes it is a basic characteristic.

In addition, an abnormality such as a short in any one or more of the capacitors C₁-Cn bited by the jig 13 between the output terminal of the control signal generator 11 and the input terminal of the second switching unit 7. This feature is characterized in that the light emitting diode (LED4) that is turned off when the charge voltage supply is cut off is generated.

Referring to the operation and effect of the circuit of the present invention configured as described above are as follows.

First, when the commercial power is supplied to the circuit of the present invention while transferring the capacitors C₁-Cn to be tested to the unit capacitor biting devices installed in each jig, respectively, the rectifying unit including the bridge diode BD1 and the smoothing capacitor C1. In (1), the AC voltage supplied in the down state through the transformer T is rectified to a predetermined DC voltage to be supplied to the first switching unit 6, and at the same time, the bridge diode BD2 and the capacitor C2-C5 In the constant voltage rectifying unit (2) consisting of a) and the regulator (IC1) rectifies the AC voltage output from the transformer (T) to a constant DC voltage and supplies it to the driving voltage of each part.

At this time, when the output terminal of the external power supply unit 5 is connected to the input terminal of the capacitor charge voltage sensing unit 4 composed of the series resistors R2 and R3 and the connector 41, the power supply unit 5 outputs the output terminal. Since the voltages falling on the series resistors R2 and R3 respectively vary according to the magnitude of the voltages, the capacitor charging voltage supplied to the first switching unit 6 is different.

That is, for example, when the voltage output from the power supply unit 5 is low, when the voltage dropped from the resistor R2 is supplied to the first switching unit 6, the voltage output from the power supply unit 5 is high The first switching unit 6 is applied with a voltage dropped by two resistors R2 and R3.

Of course, by appropriately selecting the value of the series resistance (R2, R3) of the capacitor charging voltage detection unit 4 it is possible to adjust the charge voltage of the capacitor to be tested.

In addition, the control signal of the main control unit 12, which is input to the voltage supply controller 3 composed of the protection resistor R1, the light emitting diode LED1, and the photo coupler PT1, may be any one of a "high" and "low" signal. For example, when a "low" signal is input from the main controller 12, the light emitting diode LED1 and the photo coupler PT1 are turned on and driven, respectively, so that the output voltage of the rectifier 1 is changed to the first switching unit 6. When the "high" signal is input from the main controller 12, the light emitting diode LED1 and the photo coupler PT1 are not driven, so that the supply of the output voltage of the rectifier 1 to the first switching unit 6 is reduced. Is blocked.

At this time, the light emitting diode LED1 is installed so that the operator of the capacitor tester can know how much the charging rated voltage of the capacitor currently being tested is turned on through its flashing state, and the photo coupler PT1 is the main control unit. It is provided to electrically insulate the voltage or control signal of (12) and the output voltage of the rectifier 1 supplied to the first switching unit 6, respectively.

On the other hand, when the charging rated voltage of the capacitor to be tested as described above is low, the main control unit 12 outputs a "low" signal to the input terminal of the voltage supply control unit 3 so that the output voltage of the rectifying unit 1 is increased. When the charging rated voltage of the capacitor to be tested is high, a high signal is output to the input terminal of the voltage supply controller 3 so that the output of the rectifier 1 is output to the first switching unit 6. Do not supply to the switching section (6).

Therefore, when the charging rated voltage of the capacitor to be tested is low, the voltage output from the rectifier 1 is supplied to the first switching unit 6, respectively, and the voltage output from the power supply unit 5 is low. Therefore, since the voltage dropped from the resistor R2 of the capacitor charging voltage sensing unit 4 is supplied to the first switching unit 6, the transistors Q1 and Q2 of the first switching unit 6 are " "ON". When the transistors Q1 and Q2 of the first switching unit 6 are "ON", the low output voltage of the power supply unit 5 passes through the first switching unit 6 to the second switching unit. (7) and the abnormal current detection unit 10 are supplied.

In addition, when the charging rated voltage of the capacitor to be tested is high, since the output voltage of the rectifier 1 supplied to the first switching unit 6 is cut off by the voltage supply controller 3, the power supply unit 5 Even though the voltage outputted from the first switching unit 6 is in a state of being supplied to the first switching unit 6 after it has dropped from the resistors R2 and R3 of the capacitor charging voltage sensing unit 4, Since the transistors Q1 and Q2 maintain " off, " the capacitor charging voltage output from the power supply unit 5 does not pass through the first switching unit 6 but the second switching unit 7 and the abnormal current detection unit 10. Are supplied directly.

As such, since the first switching unit 6 is automatically switched according to the charging rated voltage of the capacitors, capacitors having different charging rating voltages can be inspected by a single tester, thereby greatly reducing the test cost of the capacitor, installation cost, and installation space of the capacitor. It can be saved.

On the other hand, the main control unit 12 alternately outputs a "low" signal for generating a clock pulse and a reset signal at predetermined time intervals during the test of the capacitor, if the main control unit to the clock signal generator 8 When the "low" signal is input from (12), the light emitting diode (LED2) and the photo coupler (PT2) are turned on and driven. Therefore, the delay of the inverter (IN1) is delayed by the time constant by the resistor (R8) and the capacitor (C6). One clock signal is applied to the clock terminal of the D flip-flop constituting the control signal generator 11 with the output signal becoming high.

In addition, when the "low" signal is input from the main control unit 12 to the reset signal generator 9, the light emitting diode LED3 and the photo coupler PT3 are turned on and driven, so that the resistor R12 and the capacitor C8 are turned on. After a delay by a time constant by?), The output signal of the inverter IN2 becomes "high" and one reset signal is applied to the reset terminal of the D flip-flop constituting the control signal generator 11.

Therefore, the control signal generator 11 is controlled when the clock pulse generated by the clock signal generator 8 is controlled and predetermined data is output from the abnormal current detector 10, thereby inverting the previous state. If a predetermined signal is generated in the reset signal generator 9, the reset signal generator 9 resets the signal.

At this time, if the capacitor being tested by the predetermined jig 13 is normal and the " low " signal is output from the control signal generator 11, the output terminal of the first switching unit 6 and the voltage sensing capacitor charging Since the transistors Q7-Q9 of the second switching unit 7 provided between the output terminal of the connector 41 of the unit 4 remain in the "on" state, the capacitor sensing voltage sensing unit 4 and the first switching The output voltage of the power supply unit 5, which is applied through the unit 6 or directly through the capacitor charging voltage sensing unit 4, is passed through the second switching unit 7 to the bite of each jig. It is applied as a charging voltage to the test capacitor (C) -Cn) under test.

However, when a defect occurs in any one or more of the several capacitors held by the predetermined jig 13 as described above and an overcurrent flows in the corresponding capacitor, the output terminal and the control of the second switching unit 7 are controlled. The voltage dropped by the variable resistor VR and the resistor R16 of the abnormal current detection unit 10 provided between the input terminals of the signal generator 11 is increased by that much.

If an overcurrent flows over the current set by the variable resistor VR, and the voltage dropped by the variable resistor VR and the resistor R16 becomes equal to or greater than the base bias voltage, the transistor in the second switching unit 7 Since Q6) is turned on, the output of the inverter IN3 becomes "high".

Accordingly, a "high" signal is input to the input terminal of the control signal generator 11, and when the clock pulse is input from the clock signal generator 8, the output signal of the control signal generator 11 is "low". Is reversed from "high" state.

Therefore, the transistors Q7-Q9 in the second switching unit 7 are " off " so that the capacitor sensing voltage sensing unit 4 and the first switching unit 6 or the capacitor charging voltage sensing unit The output voltage of the power supply unit 5, which is applied to the capacitors (i.e., the capacitors bited by one jig) directly through (4), is automatically cut off by the second switching unit 7 described above.

Therefore, if a failure occurs in any one of the charging tests by applying several capacitors with one jig at a time, the voltage applied to the corresponding jig is automatically cut off, so that the current flowing through the defective capacitor will not be charged. It can prevent the impact or explosion due to overcurrent, and adjacent capacitors can prevent the fire from happening, including damage to the substrate and the test equipment itself due to chain explosion.

Of course, the control signal generator 11 is reset to a reset time inputted alternately at a predetermined time interval with a clock pulse and is reset again when the output thereof is inverted. It is possible to detect an abnormal charging state of the capacitors.

On the other hand, a light emitting diode LED4 is additionally installed between the output terminal of the control signal generator 11 and the input terminal of the second switching unit 7 to maintain a lighting state in a normal time, and to detect a predetermined current due to abnormal current detection. By turning off the supply of charge voltage to the jig, the tester of the capacitor can visually check whether the light-emitting diode is lit or off to easily identify whether a bad capacitor is included in the jig under test.

As described above, according to the present invention, first, when a failure occurs in any one of the capacitors that are bitten by several jigs that can inquire several capacitors at a time, the charging voltage applied to the jig is automatically applied. To prevent other capacitors from affecting it in advance, and secondly to prevent overcurrent flow through a defective capacitor and to explode, as well as to a chain explosion and a substrate of an adjacent capacitor due to an explosion of a defective capacitor. It is possible to prevent the damage of the test equipment and the fire which may occur in case of severe.In addition, the third capacitor may be defective due to any one of several jigs. In this case, the jig can be checked with the naked eye. Fourth, the capacitors with different charging rated voltages can be inspected with one tester. It will be effective, such as that can greatly reduce installation costs and installation space of the cost of the test equipment and the condenser.

Claims (2)

A rectifier 1 for rectifying the output voltage of the transformer T for lowering the commercial voltage to a low AC voltage and supplying the rectified voltage to a predetermined DC voltage to the first switching unit 6; A constant voltage rectifying unit (2) for rectifying the AC voltage output from the transformer (T) to a constant DC voltage and supplying it to the driving voltage of each unit; A voltage supply controller for selectively supplying the output voltage of the rectifier 1 to the first switching unit 6 according to a control signal output from the main controller 12 in response to the charging rated voltage of the capacitor to be tested ( 3) and; Capacitor charging voltage which directly supplies the capacitor charging voltage applied from the power supply unit 5 to the test capacitors C₁-Cn selectively through the first switching unit 6 or to the jig 13. A voltage sensing unit 4; A first switching unit 6 for selectively passing a voltage input through the capacitor charging voltage sensing unit 4; A clock signal generator 8 which generates clock pulses at predetermined time intervals under the control of the main controller 12; A reset signal generator 9 which generates a reset signal at predetermined time intervals under the control of the main controller 12; An abnormal current detector 10 which detects when an overcurrent flows to the jig 13 to which several test capacitors are bitten and outputs predetermined data to the control signal generator 11; Under the control of the clock pulse generated by the clock signal generator 8 and set when the predetermined data is output from the abnormal current detector 10, and when the predetermined signal is generated by the reset signal generator 9 A control signal generator 11 to be reset; The capacitor for testing the charging voltage supplied through the first switching unit 6 or directly through the capacitor charging voltage sensing unit 4 by performing a switching action corresponding to the output signal of the control signal generator 11. A charging test circuit for a capacitor, comprising: a second switching section (7) for determining whether to supply (C? -Cn). 2. The short circuit of claim 1, wherein a short is generated in any one or more of the capacitors C′-Cn bited by the jig 13 between the output terminal of the control signal generator 11 and the input terminal of the second switching unit 7. Charge test circuit of the capacitor, characterized in that the additional light emitting diode (LED4) that is turned off when the abnormality is generated and the charge voltage is cut off.