CN204347193U - Electric capacity internal explosion pick-up unit - Google Patents

Abstract

Electric capacity internal explosion pick-up unit, it comprises voltage change detection unit and processor U9; This voltage change and the change in voltage threshold value preset for detecting the voltage change of electric capacity Cx to be aging, and are compared by this voltage change detection unit, when this voltage change is greater than change in voltage threshold value, send voltage jump signal to processor U9; Processor U9 is used for according to the cue of this voltage jump signal output for pointing out electric capacity internal explosion.Above-mentioned utility model can detect the electric capacity that internal explosion or scintillation occur rapidly and accurately in electric capacity operation to be aging.

Description

Capacitor internal explosion detection device

technical field

The utility model relates to an explosion detection device inside a capacitor.

Background technique

Sometimes there are some technical problems in the production process of capacitors. For example, burrs will be generated when the electrode foil is cut, and the electrolyte or electrolytic paper contains impurities; Through the voltage, the electricity in the capacitor is discharged through the burr and the tip of the electrode foil, and it will be consumed in a large amount in an instant, and there will be a danger of internal explosion. If the degree of internal explosion is relatively large, the exploded shell may endanger personal safety. If the degree of internal explosion is small, the potential danger cannot be known from the appearance of the capacitor, even through conventional capacity or leakage may not be detected. For products containing impurities in the electrolyte, when the voltage rises to the breakdown point, it will flash suddenly, and the electrolyte at the flash point will also be evaporated by high temperature, and then the electrolyte in the normal part will be absorbed by the dry electrolytic paper and repeat. If there is a flash fire, the internal pressure of the capacitor will increase accordingly, and the capacitor will explode at any time after multiple flash fires.

Finished capacitors have to go through an aging process before leaving the factory. The aging process is the first time the capacitor is charged. The time required for aging is longer, ranging from more than one hour to dozens of hours, and it is carried out in a high temperature environment. The traditional Capacitor aging boxes and fully automatic aging machines only charge the capacitors with resistance-limited current during the aging process, and do not have the function of discovering and detecting implosion flash fires. In this way, capacitors with internal explosion risks may be regarded as compliant Capacitors are shipped from the factory.

Utility model content

Aiming at the deficiencies of the prior art, the utility model aims to provide a capacitor internal explosion detection device which can solve the above technical problems.

In order to achieve the above object, the utility model adopts the following technical solutions:

A capacitor internal explosion detection device, which includes a voltage change detection unit and a processor U9;

The voltage change detection unit is used to detect the voltage change value of the capacitor Cx to be aged, and compare the voltage change value with a preset voltage change threshold, and send a voltage mutation signal to the Processor U9; the processor U9 is configured to output a prompt signal for prompting internal explosion of the capacitor according to the voltage mutation signal.

Preferably, the capacitor internal explosion detection device also includes a current sampling unit; the current sampling unit is used to detect the current of the aging capacitor Cx to generate a current sampling signal, and the processor U9 is also used to receive the current sampling of the current sampling unit in real time signal to detect a sudden change in the current sampling signal.

Preferably, the capacitor internal explosion detection device further includes a constant current adjustment unit; the constant current adjustment unit is used to adjust the current of the capacitor Cx to be aged to a preset constant current value.

Preferably, the capacitor internal explosion detection device also includes a voltage sampling unit, which is used to detect the voltage of the aging capacitor to generate a voltage sampling signal; the processor U9 is also used to receive the voltage sampling signal in real time to detect a sudden change in voltage Signal.

Preferably, the capacitor internal explosion detection device also includes a rectifier bridge stack U1, and the positive terminal of a DC charging power supply VCC is connected to the negative terminal of the DC charging power supply VCC through the AC terminal of the aging capacitor Cx and the rectifying bridge stack U1;

The voltage change detection unit includes resistor R3, capacitor C2, resistor R4, integrated operational amplifier U2A, resistor R5, capacitor C5 and resistor R12; the DC output terminal V+ of the rectifier bridge stack U1 is grounded through resistor R3, capacitor C2 and resistor R4 in turn The non-inverting end of the integrated operational amplifier U2A is connected between the capacitor C2 and the resistor R4; the inverting end of the integrated operational amplifier U2A is connected to the PWM signal output terminal PB2 of the processor through the resistor R12, and grounded through the capacitor C5.

Preferably, the current sampling unit includes a resistor R8, a resistor R9, a capacitor C3, and an analog-to-digital converter U8; the constant current regulation unit includes a field effect transistor Q1, an integrated operational amplifier U2B, a resistor R11, and a capacitor C4; the rectifier bridge stack U1 The DC output terminal V+ is connected to the drain of the field effect transistor Q1, and the source of the field effect transistor Q1 is grounded through the resistor R8, and also grounded through the resistor R9 and the capacitor C3 in turn; the input terminal +IN of the analog-to-digital converter U8 is connected to the capacitor C3 and the resistor Between R9, the output terminal DOUT of the analog-to-digital converter U8 is connected to the input terminal PD6 of the processor U9, the enabling terminal CS of the analog-to-digital converter U8 is connected to the PD7 of the processor U9; the gate of the field effect transistor Q1 is connected to the integrated operational amplifier The output terminal of U2B, the non-inverting terminal of the integrated operational amplifier U2B is grounded through the capacitor C4, and also connected to the PWM signal output terminal PB1 of the processor U9 through the resistor R11; the inverting terminal of the integrated operational amplifier U2B is connected between the resistor R8 and the resistor R9.

Preferably, the voltage sampling unit includes a resistor R1, a resistor R2, a capacitor C1, and an analog-to-digital converter U7; the DC output terminal V+ of the rectifier bridge stack U1 is grounded through the resistor R1 and the resistor R2 in turn, and the capacitor C1 and the resistor R2 are connected in parallel; The input terminal +IN of the converter U7 is connected between the resistor R1 and the resistor R2, the output terminal DOUT of the analog-to-digital converter U7 is connected to the input terminal PD6 of the processor U9, and the enabling terminal CS of the analog-to-digital converter U7 is connected to the output terminal PB0.

Preferably, the capacitor internal explosion detection device also includes a serial communication unit for communicating with a host computer; the serial communication unit is connected to the processor U9; the processor U9 is also used to pass the current sampling signal through the serial The communication unit sends it to the host computer for storage.

Preferably, the capacitor internal explosion detection device also includes a serial communication unit for communicating with a host computer; the serial communication unit is connected to the processor U9; the processor U9 is also used to pass the voltage sampling signal through the serial The communication unit sends it to the host computer for storage.

The above-mentioned utility model can quickly and accurately detect the capacitor with internal explosion or flash fire in the aging process of the capacitor.

Description of drawings

Fig. 1 is a circuit diagram of a preferred embodiment of a capacitor internal explosion detection device of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described:

Please refer to FIG. 1 , the utility model relates to a capacitor internal explosion detection device, and its preferred embodiment includes a voltage change detection unit and a processor U9.

The voltage change detection unit is used to detect the voltage change value of the capacitor to be aged, and compare the voltage change value with the preset voltage change threshold, and when the voltage change value is greater than the voltage change threshold, send a voltage mutation signal to the processing device.

The processor U9 is used to output a prompt signal for prompting the internal explosion of the capacitor according to the voltage mutation signal.

In this embodiment, the capacitor internal explosion detection device further includes a rectifier bridge stack U1, the positive terminal of a DC charging power supply VCC is connected to the negative terminal of the DC charging power supply VCC through the aging capacitor Cx and the AC terminal of the rectifying bridge stack U1. The DC charging power supply VCC, the aging capacitor Cx and the bridge rectifier U1 constitute a charging circuit for the aging capacitor Cx.

The voltage change detection unit includes a resistor R3, a capacitor C2, a resistor R4, an integrated operational amplifier U2A, a resistor R5, a capacitor C5 and a resistor R12.

The DC output terminal V+ of the rectifier bridge stack U1 is grounded sequentially through the resistor R3, the capacitor C2 and the resistor R4. The non-inverting terminal of the integrated operational amplifier U2A is connected between the capacitor C2 and the resistor R4. The inverting terminal of the integrated operational amplifier U2A is connected to the PWM signal output terminal PB2 of the processor through the resistor R12, and is also grounded through the capacitor C5.

When the aging capacitor Cx implodes or flashes during the charging process, it will consume a large amount of itself in an instant, so that the voltage of the aging capacitor Cx will drop sharply instantly. Since the output voltage of the DC charging power supply VCC is constant, the output voltage of the rectifier bridge stack U1 The direct current voltage will increase greatly instantaneously, and the calculus circuit composed of resistor R3 and capacitor C2 will transmit the voltage change value to the integrated operational amplifier U2A. The processor U9 outputs a first PWM signal with a preset duty cycle, and the PWM signal is converted into an analog voltage change threshold through an integrating circuit composed of a resistor R12 and a capacitor C5, and then sent to the integrated operational amplifier U2A. The integrated operational amplifier U2A compares the voltage change value with the voltage change threshold, and outputs a high level signal to the first input terminal PB7 of the processor U9 when the voltage change value is greater than the voltage change threshold. The processor U9 outputs a prompt signal for prompting internal explosion of the capacitor according to the high-level signal.

Wherein, by setting the duty cycle of the first PWM signal, the size of the voltage change threshold can be correspondingly changed to adjust the detection sensitivity of the voltage change detection unit. The prompt signal for prompting the internal explosion of the capacitor may be a signal for driving a speaker or/and a light emitting diode to work.

The voltage change detection unit includes a voltage regulator diode D2, which is connected in parallel with a resistor R4, and is used to clamp the instantaneously changing voltage to prevent the integrated operational amplifier U2A from being damaged by excessive voltage.

In this embodiment, the capacitor internal explosion detection device further includes a current sampling unit and a constant current regulating unit. The current sampling unit is used to detect the current of the capacitor Cx to be aged to generate a current sampling signal, and the processor U9 is also used to receive the current sampling signal of the current sampling unit in real time to detect a sudden change in the current sampling signal; thus, it can be treated The aging capacitor implodes for secondary judgment. The constant current regulating unit is used to regulate the current of the aging capacitor Cx to a preset constant current value, so as to limit the charging current when the capacitor implodes or flashes.

The current sampling unit includes a resistor R8, a resistor R9, a capacitor C3 and an analog-to-digital converter U8. The constant current regulating unit includes a field effect transistor Q1, an integrated operational amplifier U2B, a resistor R11 and a capacitor C4.

The DC output terminal V+ of the rectifier bridge stack U1 is connected to the drain of the field effect transistor Q1, and the source of the field effect transistor Q1 is grounded through the resistor R8, and also grounded through the resistor R9 and the capacitor C3 in turn. The input terminal +IN of the analog-to-digital converter U8 is connected between the capacitor C3 and the resistor R9, the output terminal DOUT of the analog-to-digital converter U8 is connected to the input terminal PD6 of the processor U9, and the enabling terminal CS of the analog-to-digital converter U8 is connected to the processor PD7 of U9. The gate of the FET Q1 is connected to the output terminal of the integrated operational amplifier U2B, the non-inverting terminal of the integrated operational amplifier U2B is grounded through the capacitor C4, and connected to the PWM signal output terminal PB1 of the processor U9 through the resistor R11. The inverting terminal of the integrated operational amplifier U2B is connected between the resistor R8 and the resistor R9.

The direct current from the bridge rectifier stack U1 passes through the integration circuit formed by the capacitor C3 and the resistor R9, and then the analog-to-digital conversion is performed by the analog-to-digital converter U8, and then the current sampling signal is sent to the processor U9. At the same time, the integrated potential signal is sent to the integrated operational amplifier U2B. The PWM signal output terminal PB2 of the processor U9 outputs a second PWM signal with a preset duty ratio, and the second PWM signal is converted into an analog potential threshold through an integrating circuit composed of a resistor R11 and a capacitor C4, and the integrated operational amplifier U2B will The integrated potential signal is compared with the current threshold. When the current signal is greater than the current threshold, the integrated operational amplifier U2B outputs a low-level signal, which makes the field effect transistor Q1 cut off, thereby disconnecting the rectifier bridge stack U1 from the current sampling unit. , the resistor R8, the resistor R9 and the capacitor C3 form a discharge circuit, the voltage of the resistor R9 decreases until the potential signal of the inverting terminal of the integrated operational amplifier U2B is less than the potential threshold, and the output terminal of the integrated operational amplifier U2B outputs a high-level signal, so that The field effect transistor Q1 is turned on, and the bridge rectifier U1 and the current sampling unit are turned on again. In this way, the current of the aging capacitor Cx is dynamically adjusted to a preset constant current value, so as to limit the charging current when the capacitor implodes or flashes.

In this embodiment, the capacitor internal explosion detection device further includes a voltage sampling unit for detecting the voltage of the aging capacitor Cx to generate a voltage sampling signal. The processor U9 is also used to receive the voltage sampling signal in real time, so as to detect a sudden change in the voltage signal. In this way, a second judgment can be made on the implosion of the aging capacitor.

The voltage sampling unit includes a resistor R1, a resistor R2, a capacitor C1 and an analog-to-digital converter U7. The DC output terminal V+ of the rectifier bridge stack U1 is grounded sequentially through the resistor R1 and the resistor R2, and the capacitor C1 and the resistor R2 are connected in parallel. The input terminal +IN of the analog-to-digital converter U7 is connected between the resistor R1 and the resistor R2, the output terminal DOUT of the analog-to-digital converter U7 is connected to the input terminal PD6 of the processor U9, and the enabling terminal CS of the analog-to-digital converter U7 is connected to the processor The output terminal PB0 of U9.

The processor U9 controls the analog-to-digital converter U7 and the analog-to-digital converter U8 to work alternately, so as to respectively read the voltage sampling signal and the current sampling signal through the input terminal PD6.

The capacitor internal explosion detection device also includes a serial communication unit 10 for communicating with a host computer. The serial communication unit 10 is connected to the processor U9. The processor U9 is also used to send the current sampling signal and the voltage sampling signal to the host computer through the serial communication unit for storage.

For those skilled in the art, various other corresponding changes and modifications can be made according to the technical solutions and ideas described above, and all these changes and modifications should fall within the protection scope of the claims of the present invention .

Claims (9)

1. A capacitor internal explosion detection device is characterized in that: it comprises a voltage change detection unit and a processor U9; The voltage change detection unit is used to detect the voltage change value of the capacitor Cx to be aged, and compare the voltage change value with a preset voltage change threshold, and send a voltage mutation signal to the Processor U9; the processor U9 is configured to output a prompt signal for prompting internal explosion of the capacitor according to the voltage mutation signal. 2. capacitor internal explosion detection device as claimed in claim 1, is characterized in that: this capacitor internal explosion detection device also comprises current sampling unit; This current sampling unit is used for detecting the electric current of capacitor Cx to be aged, to generate current sampling signal , the processor U9 is also used to receive the current sampling signal of the current sampling unit in real time, so as to detect a sudden change in the current sampling signal. 3. The capacitor internal explosion detection device as claimed in claim 2, characterized in that: the capacitor internal explosion detection device also includes a constant current adjustment unit; the constant current adjustment unit is used to adjust the current of the aging capacitor Cx to be preset constant current value. 4. capacitor internal explosion detection device as claimed in claim 1, is characterized in that: this capacitor internal explosion detection device also comprises a voltage sampling unit, is used for detecting the voltage of capacitor to be aged, to generate voltage sampling signal; U9 is also used to receive the voltage sampling signal in real time to detect a sudden change in the voltage signal. 5. The capacitor internal explosion detection device according to claim 1, characterized in that: the capacitor internal explosion detection device also includes a rectifier bridge stack U1, and the positive terminal of a DC charging power supply VCC passes through the capacitor Cx to be aged and the rectifier bridge stack U1 The AC terminal is connected to the negative terminal of the DC charging power supply VCC; The voltage change detection unit includes resistor R3, capacitor C2, resistor R4, integrated operational amplifier U2A, resistor R5, capacitor C5 and resistor R12; the DC output terminal V+ of the rectifier bridge stack U1 is grounded through resistor R3, capacitor C2 and resistor R4 in turn The non-inverting end of the integrated operational amplifier U2A is connected between the capacitor C2 and the resistor R4; the inverting end of the integrated operational amplifier U2A is connected to the PWM signal output terminal PB2 of the processor through the resistor R12, and grounded through the capacitor C5. 6. The capacitor internal explosion detection device as claimed in claim 3, characterized in that: the capacitor internal explosion detection device also includes a rectifier bridge stack U1, and the positive terminal of a DC charging power supply VCC passes through the capacitor Cx to be aged and the rectifier bridge stack U1 The AC end of the battery is connected to the negative end of the DC charging power supply VCC; The current sampling unit includes a resistor R8, a resistor R9, a capacitor C3, and an analog-to-digital converter U8; the constant current regulation unit includes a field effect transistor Q1, an integrated operational amplifier U2B, a resistor R11, and a capacitor C4; the DC output terminal of the rectifier bridge stack U1 V+ is connected to the drain of the field effect transistor Q1, and the source of the field effect transistor Q1 is grounded through the resistor R8, and then grounded through the resistor R9 and the capacitor C3 in turn; the input terminal +IN of the analog-to-digital converter U8 is connected between the capacitor C3 and the resistor R9 , the output terminal DOUT of the analog-to-digital converter U8 is connected to the input terminal PD6 of the processor U9, the enabling terminal CS of the analog-to-digital converter U8 is connected to the PD7 of the processor U9; the gate of the field effect transistor Q1 is connected to the output of the integrated operational amplifier U2B The non-inverting terminal of the integrated operational amplifier U2B is grounded through the capacitor C4, and connected to the PWM signal output terminal PB1 of the processor U9 through the resistor R11; the inverting terminal of the integrated operational amplifier U2B is connected between the resistor R8 and the resistor R9. 7. The capacitor internal explosion detection device as claimed in claim 4, characterized in that: the capacitor internal explosion detection device also includes a rectifier bridge stack U1, and the positive terminal of a DC charging power supply VCC passes through the aging capacitor Cx and the rectifier bridge stack U1 The AC end of the battery is connected to the negative end of the DC charging power supply VCC; The voltage sampling unit includes a resistor R1, a resistor R2, a capacitor C1 and an analog-to-digital converter U7; the DC output terminal V+ of the rectifier bridge stack U1 is grounded through the resistor R1 and the resistor R2 in turn, and the capacitor C1 and the resistor R2 are connected in parallel; the analog-to-digital converter U7 The input terminal +IN of the A/D converter is connected between the resistor R1 and the resistor R2, the output terminal DOUT of the analog-to-digital converter U7 is connected to the input terminal PD6 of the processor U9, and the enabling terminal CS of the analog-to-digital converter U7 is connected to the output terminal PB0 of the processor U9 . 8. capacitor internal explosion detection device as claimed in claim 2, is characterized in that: this capacitor internal explosion detection device also includes a serial communication unit for communicating with a host computer; this serial communication unit connects processor U9 ; The processor U9 is also used to send the current sampling signal to the host computer through the serial communication unit for storage. 9. capacitor internal explosion detection device as claimed in claim 7, is characterized in that: this capacitor internal explosion detection device also includes a serial communication unit for communicating with a host computer; this serial communication unit connects processor U9 ; The processor U9 is also used to send the voltage sampling signal to the host computer through the serial communication unit for storage.