CN-121978489-A - Capacitor high voltage resistant detection response protection circuit and method

CN121978489ACN 121978489 ACN121978489 ACN 121978489ACN-121978489-A

Abstract

The invention discloses a capacitor high voltage resistance detection response protection circuit and a capacitor high voltage resistance detection response protection method, and relates to the technical field of capacitor detection. The circuit comprises a main control module, a voltage generation module, a first current limiting module, a second current limiting module, a constant voltage power module, a short-circuit protection module, a main control module and a driving feedback module, wherein the voltage generation module is connected with the main control module, the first current limiting module is connected with the voltage generation module, the input end of the second current limiting module is connected with the output end of the first current limiting module, the output end of the second current limiting module is connected with one end of a capacitor to be tested, the other end of the capacitor to be tested is connected with the input end of the voltage generation module, the current limiting threshold module is connected with the main control module, the input end of the driving feedback module is connected with the output end of the current limiting threshold module, the output end of the driving feedback module is connected with the controlled end of the second current limiting module, the input end of the switching module is connected with the main control module, the output end of the driving feedback module is connected with the constant voltage power module, the constant voltage power module is connected with the first current limiting module, and the input end of the short-circuit protection module is connected with the main control module and the driving feedback module. The circuit can improve the voltage endurance and perform short-circuit protection.

Inventors

LIAO SHENGJIAN
LIU DONG
LI YANGYUN
Zheng Wenhang
MA ZONGHUA

Assignees

珠海禅光科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (10)

1. A capacitor high voltage tolerant sense response protection circuit comprising: a main control module; The voltage generation module is electrically connected with the main control module; the input end of the first current limiting module is electrically connected with the output end of the voltage generating module; The input end of the second current limiting module is electrically connected with the output end of the first current limiting module, the output end of the second current limiting module is electrically connected with one end of a capacitor to be tested, and the other end of the capacitor to be tested is electrically connected with the input end of the voltage generating module; The input end of the current limiting threshold module is electrically connected with the main control module; the input end of the driving feedback module is electrically connected with the output end of the current limiting threshold module, and the output end of the driving feedback module is electrically connected with the controlled end of the second current limiting module; the input end of the switch module is electrically connected with the main control module, and the output end of the switch module is electrically connected with the input end of the driving feedback module; the output end of the constant voltage power supply module is electrically connected with the controlled end of the first current limiting module, and the constant voltage power supply module is also electrically connected with the main control module; the input end of the short-circuit protection module is electrically connected with the main control module and the driving feedback module, the output end of the short-circuit protection module is electrically connected with the second current limiting module, and the short-circuit protection module is used for switching off the second current limiting module and the first current limiting module when the capacitor to be tested is short-circuited.
2. The capacitor high voltage tolerant detection response protection circuit of claim 1 wherein a reverse isolation module is further provided between said constant voltage power supply module and said first current limiting module, said reverse isolation module comprising: The anode of the first diode is electrically connected with the output end of the constant voltage power supply module, and the cathode of the last diode is electrically connected with the controlled end of the first current limiting module through a first resistor.
3. The capacitor high voltage tolerant detection response protection circuit of claim 2 wherein said first current limiting module comprises: The first end of the first regulating tube is electrically connected with the output end of the voltage generation module, and the controlled end of the first regulating tube is electrically connected with the first resistor through a second resistor; The anode of the first zener diode is electrically connected with the input end of the second current limiting module, and the cathode of the first zener diode is electrically connected with the controlled end of the first regulating tube; one end of the third resistor is electrically connected with the second end of the first regulating tube, and the other end of the third resistor is electrically connected with the input end of the second current limiting module; The anode of the second zener diode is electrically connected with the input end of the second current limiting module, and the cathode of the second zener diode is electrically connected with the second end of the first regulating tube.
4. The capacitor high voltage tolerant detection response protection circuit of claim 1 wherein said second current limiting module comprises: the first end of the second regulating tube is electrically connected with the output end of the first current limiting module, and the controlled end of the second regulating tube is electrically connected with the output end of the driving feedback module through a fourth resistor; The anode of the third zener diode is electrically connected with one end of the capacitor to be tested, and the cathode of the third zener diode is electrically connected with the controlled end of the second regulating tube; One end of the fifth resistor is electrically connected with the second end of the second regulating tube, and the other end of the fifth resistor is electrically connected with one end of the capacitor to be tested; and the anode of the fourth zener diode is electrically connected with one end of the capacitor to be tested, and the cathode of the fourth zener diode is electrically connected with the second end of the second regulating tube.
5. The capacitor high voltage tolerant detection response protection circuit of claim 1 wherein said current limit threshold module comprises: the non-inverting input end of the first operational amplifier is electrically connected with the main control module through a sixth resistor, the non-inverting input end of the first operational amplifier is grounded through a first capacitor, the positive power end of the first operational amplifier is connected with a first positive voltage, and the negative power end of the first operational amplifier is connected with a first negative voltage; a seventh resistor, one end of which is grounded, and the other end of which is electrically connected with the inverting input end of the first operational amplifier; An eighth resistor, one end of which is electrically connected with the other end of the seventh resistor, and the other end of which is electrically connected with the output end of the first operational amplifier; and one end of the ninth resistor is electrically connected with the other end of the eighth resistor, and the other end of the ninth resistor is electrically connected with the input end of the driving feedback module.
6. The capacitor high voltage tolerant detection response protection circuit of claim 1 wherein said drive feedback module comprises: The non-inverting input end of the second operational amplifier is electrically connected with the output end of the current limiting threshold module and the output end of the switch module, the output end of the second operational amplifier is electrically connected with the controlled end of the second current limiting module, the positive power end of the second operational amplifier is connected with a first positive voltage, and the negative power end of the second operational amplifier is connected with a first negative voltage; and one end of the tenth resistor is electrically connected with the inverting input end of the second operational amplifier, and the other end of the tenth resistor is electrically connected with the second current limiting module and the short circuit protection module.
7. The capacitor high voltage tolerant detection response protection circuit of claim 1 wherein said switch module comprises: The positive power supply end of the third operational amplifier is connected with the second positive voltage, the negative power supply end of the third operational amplifier is connected with the first negative voltage, and the output end of the third operational amplifier is electrically connected with the input end of the driving feedback module through the twelfth resistor.
8. The capacitor high voltage tolerant detection response protection circuit of claim 1 wherein said short circuit protection module comprises: The short circuit threshold value adjusting unit comprises a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a second capacitor and a fourth operational amplifier, wherein the non-inverting input end of the fourth operational amplifier is electrically connected with the main control module through the thirteenth resistor, the non-inverting input end of the fourth operational amplifier is grounded through the second capacitor, one end of the fourteenth resistor is grounded, the other end of the fourteenth resistor is electrically connected with the inverting input end of the fourth operational amplifier and one end of the fifteenth resistor, the other end of the fifteenth resistor is electrically connected with the output end of the fourth operational amplifier, and one end of the sixteenth resistor is electrically connected with the output end of the fourth operational amplifier; The threshold window comparison unit comprises a fifth operational amplifier, a seventeenth resistor and an eighteenth resistor, wherein the non-inverting input end of the fifth operational amplifier is electrically connected with the other end of the sixteenth resistor, the inverting input end of the fifth operational amplifier is electrically connected with the driving feedback module through the seventeenth resistor, the positive power supply end of the fifth operational amplifier is connected with a second positive voltage, the negative power supply end of the fifth operational amplifier is grounded, one end of the eighteenth resistor is connected with the second positive voltage, and the other end of the eighteenth resistor is electrically connected with the output end of the fifth operational amplifier; the accelerating turn-off unit comprises an inverter, a switching tube and a nineteenth resistor, wherein the input end of the inverter is electrically connected with the output end of the fifth operational amplifier, the output end of the inverter is electrically connected with the controlled end of the switching tube, the first end of the switching tube is electrically connected with the controlled end of the second current limiting module through the nineteenth resistor, and the second end of the switching tube is grounded; And one end of the twentieth resistor is electrically connected with the main control module, and the other end of the twentieth resistor is electrically connected with the output end of the fifth operational amplifier.
9. The capacitor high voltage tolerant detection response protection circuit of claim 1 further comprising a voltage equalizing protection module electrically connected to said first current limiting module and said second current limiting module for voltage equalizing protection of said first current limiting module and said second current limiting module.
10. A capacitor high voltage resistant detection response protection method is characterized in that, the capacitor high voltage tolerant detection response protection circuit of any one of claims 1-9, the method comprising: the current limiting threshold module and the switch module are set through the main control module, so that the driving feedback module controls the second current limiting module to be in a conducting state; Setting a constant voltage power supply module through a main control module to enable a first current limiting module to be in a conducting state; Generating detection voltage and detection current through a voltage generation module, and enabling the detection voltage and the detection current to pass through the first current limiting module and the second current limiting module to detect a capacitor to be detected; And when the capacitor to be tested is short-circuited, the first current limiting module and the second current limiting module are turned off through the short-circuit protection module.

Description

Capacitor high voltage resistant detection response protection circuit and method Technical Field The invention relates to the technical field of capacitor detection, in particular to a capacitor high-voltage-resistant detection response protection circuit and method. Background At present, new energy markets are in explosive growth, the power supply platform of the new energy markets is also extended from 400V to 2000V or higher, so that the voltage platforms of corresponding functional products such as batteries, power distribution, power supply and the like are required to be matched with the power supply platform, and the requirements of high-voltage-resistant MLCC (Multilayer Ceramic Capacitor ) capacitors are continuously increased, and the yield is very high. In the field of MLCC capacitor high withstand voltage test, a 2000V high voltage power supply current limiting module is the last gateway of 2000V high voltage power supply to output, controls whether output and output current, needs to bear high withstand voltage above 2000V and high heat caused by high voltage drop, and avoids a series of potential safety hazards such as breakdown short circuit, fire and the like of the MLCC capacitor, and loss is caused. The current technical scheme generally adopts a single MOS tube to design a current limiting module, and the highest withstand voltage of a large number of MOS tubes sold in the market is 1500V, and the MOS tubes are restricted by withstand voltage and cannot work at 2000V high voltage for a long time. Moreover, when the MLCC capacitor is broken down and short-circuited in the detection process, a series of potential safety hazards such as fire are easily caused. In addition, the existing 2000V high-voltage power supply in the current market is very short, the output channel is single and the price is high, while the 2000V high-voltage resistant detection station of the MLCC capacitor high-speed multi-channel sorting tester is fixedly provided with a 2000V high-voltage power supply corresponding test in each track, for example, 8 channels are measured, namely, 8 2000V high-voltage power supplies are needed, so that the number of the 2000V high-voltage power supplies used by the high-speed multi-channel sorting tester is increased sharply, the volume and components of the MLCC capacitor high-speed multi-channel sorting tester are increased, the price of the 2000V high-voltage power supply is not very high, the control interface is increased, the process is complex, the components are numerous, the large-scale and batch production is difficult, and various customer demands cannot be met, and the MLCC capacitor high-voltage resistant multi-channel sorting tester is difficult to be widely applied. Disclosure of Invention The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a capacitor high voltage resistance detection response protection circuit and a capacitor high voltage resistance detection response protection method, which can improve the voltage resistance of a current limiting module and perform short circuit protection on the circuit. In a first aspect, a capacitor high voltage resistant detection response protection circuit according to an embodiment of the present invention includes: a main control module; The voltage generation module is electrically connected with the main control module and is used for providing detection voltage and detection current; the input end of the first current limiting module is electrically connected with the output end of the voltage generating module; The input end of the second current limiting module is electrically connected with the output end of the first current limiting module, the output end of the second current limiting module is electrically connected with one end of a capacitor to be tested, and the other end of the capacitor to be tested is electrically connected with the input end of the voltage generating module; The input end of the current limiting threshold module is electrically connected with the main control module, and the current limiting threshold module is used for setting a limiting threshold of the detection current; The input end of the driving feedback module is electrically connected with the output end of the current limiting threshold module, the output end of the driving feedback module is electrically connected with the controlled end of the second current limiting module, and the driving feedback module is used for driving the second current limiting module and feeding back the detection current; The input end of the switch module is electrically connected with the main control module, the output end of the switch module is electrically connected with the input end of the drive feedback module, and the switch module is used for controlling the on and off of the first current limiting module and the second current limiting module; the outp