High-voltage pulse signal detection circuit, PCB and detection device thereof

Abstract

The utility model discloses a high voltage pulse signal detection circuit, PCB board and detection device, including current transformer LH1, first triode Q1, level supply terminal, detection receiving unit, current transformer LH1 is provided with primary side coil and secondary side coil, the secondary side coil one end is connected with rectification unit, the other end of secondary side coil ground, the detection receiving unit is connected with the rectification unit, the detection receiving unit is connected with the detection receiving unit. The base electrode of the first triode Q1 is connected with the rectification unit, the collector electrode of the first triode Q1 is connected with the level supply end and the detection receiving unit, and the emitter electrode of the first triode Q1 is grounded; the current transformer is used for independently detecting the current change of the load parallel circuit of the electric field circuit so as to judge whether flashover discharge is generated on the high-voltage side of the original circuit, and the response speed of flashover voltage detection is greatly improved through the mode.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit detection equipment, in particular to a high-voltage pulse signal detection circuit, a PCB board and a detection device thereof. Background Art

[0002] The traditional high-voltage pulse detection method of the electric field circuit is generally to connect multiple voltage-dividing resistors in series with the high-voltage side coil of the transformer, and then connect a detection resistor in series with the secondary coil of the transformer, and use the voltage changes of the voltage-dividing resistors and the voltage changes of the detection resistors to determine whether a pulse discharge occurs. However, this detection method is not stable. Since the load resistor on the high-voltage side of the electric field circuit has a large resistance and consumes a small current, it is difficult to detect its current using the detection resistor. This makes it difficult to determine whether a flashover discharge occurs on the high-voltage side and it is impossible to determine whether the electric field is working normally.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a high-voltage pulse signal detection circuit, which uses a current transformer to separately detect the current changes in the load parallel circuit of the electric field circuit, so as to improve the detection accuracy and quickly determine whether flashover discharge occurs on the high-voltage side.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A high-voltage pulse signal detection circuit comprises a current transformer LH1, a first transistor Q1, a level supply end, and a detection receiving unit, wherein the current transformer LH1 is provided with a primary coil and a secondary coil, one end of the secondary coil is connected to a rectifier unit, the other end of the secondary coil is grounded, the base of the first transistor Q1 is connected to the rectifier unit, the collector of the first transistor Q1 is respectively connected to the level supply end and the detection receiving unit, and the emitter of the first transistor Q1 is grounded.

[0007] In the high-voltage pulse signal detection circuit, the rectifier unit includes a first diode D1 and a voltage divider and current limiting part, the cathode of the first diode D1 is respectively connected to one end of the secondary coil and one end of the voltage divider and current limiting part, the anode of the first diode D1 is grounded, and the other end of the voltage divider and current limiting part is connected to the base of the first transistor Q1.

[0008] In the high-voltage pulse signal detection circuit, the voltage divider and current limiting part includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the cathode of the first diode D1, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2 and the base of the first transistor Q1, and the other end of the second resistor R2 is grounded.

[0009] In the high-voltage pulse signal detection circuit, the detection receiving unit includes a voltage divider, a delay unit and a receiving unit, one end of the voltage divider is connected to the level supply end, the other end of the voltage divider is respectively connected to the collector of the first transistor Q1 and one end of the delay unit, and the other end of the delay unit is connected to the receiving unit.

[0010] In the high-voltage pulse signal detection circuit, the voltage divider includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the level supply end, the other end of the third resistor R3 is respectively connected to the collector of the first transistor Q1, one end of the delay part and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the receiving part.

[0011] In the high-voltage pulse signal detection circuit, the delay unit includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 and the second capacitor C2 are respectively connected to the collector of the first transistor Q1, and the other end of the first capacitor C1 and the second capacitor C2 are grounded.

[0012] The present application also provides a PCB board printed with the high-voltage pulse signal detection circuit as described above.

[0013] The present application also provides a detection device, which uses the high-voltage pulse signal detection circuit as described above to perform operation control.

[0014] Beneficial effects:

[0015] The utility model provides a high-voltage pulse signal detection circuit. When working, the primary coil of the current transformer LH1 is used to collect the voltage of the load resistor in the original circuit, and the output voltage of the secondary coil is 0. The first transistor Q1 enters the cut-off state when there is no conduction voltage at the base. At this time, the high level at the level supply end directly flows into the detection receiving unit. When the detection receiving unit receives the high-level signal, it is determined that no flashover discharge is generated on the high-voltage side of the original circuit; when the primary coil of the current transformer LH1 detects the voltage of the load resistor in the original circuit, the secondary coil will output a positive pulse voltage, and the first transistor Q1 will generate a positive pulse voltage at the base. When the positive pulse voltage is received, it enters the on state. At this time, the high level of the level supply end flows to the collector of the first transistor Q1 and is derived from the emitter, while the detection receiving unit has no high level signal input, that is, the signal received by the detection receiving unit changes from a high level to a low level. When the detection receiving unit receives a low level signal, it is determined that a flashover discharge occurs on the high-voltage side of the original circuit; the first transistor Q1 is used to detect the input voltage of the secondary coil to determine whether a flashover discharge occurs on the high-voltage side of the original circuit. In this way, the response speed of the detection output discharge pulse is greatly improved, so that the user can grasp the working state of the electric field. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a circuit structure diagram of the high-voltage pulse signal detection circuit provided by the utility model.

[0017] Explanation of main component symbols: 1-primary coil, 2-secondary coil, 3-rectifier unit, 4-detection receiving unit. DETAILED DESCRIPTION

[0018] The utility model provides a high-voltage pulse signal detection circuit, a PCB board and a detection device thereof. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] In the description of the present utility model, it should be understood that the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0020] See also Figure 1The utility model provides a high-voltage pulse signal detection circuit, including a current transformer LH1, a first transistor Q1, a level supply end, and a detection receiving unit 4. The current transformer LH1 is provided with a primary coil 1 and a secondary coil 2. One end of the secondary coil 2 is connected to a rectifier unit 3, and the other end of the secondary coil 2 is grounded. The base of the first transistor Q1 is connected to the rectifier unit 3, the collector of the first transistor Q1 is respectively connected to the level supply end and the detection receiving unit 4, and the emitter of the first transistor Q1 is grounded.

[0021] The working principle of the present application is as follows: when working, the primary coil 1 of the current transformer LH1 is used to collect the voltage of the load resistor in the original circuit, and the output voltage of the secondary coil 2 is 0. The first transistor Q1 enters the cut-off state when there is no conduction voltage at the base. At this time, the high level at the level supply end directly flows into the detection receiving unit 4. When the detection receiving unit 4 receives a high level signal, it is determined that no flashover discharge has occurred on the high-voltage side of the original circuit; when the primary coil 1 of the current transformer LH1 detects the voltage of the load resistor in the original circuit, the secondary coil 2 will output a positive pulse voltage, and the first transistor Q1 receives the high level signal at the base. When a positive pulse voltage occurs, the device enters the on state. At this time, the high level at the level supply end flows to the collector of the first transistor Q1 and is derived from the emitter, while the detection receiving unit 4 has no high level signal input, that is, the signal received by the detection receiving unit 4 changes from a high level to a low level. When the detection receiving unit 4 receives a low level signal, it is determined that a flashover discharge occurs on the high-voltage side of the original circuit. The first transistor Q1 is used to detect the input voltage of the secondary coil 2 to determine whether a flashover discharge occurs on the high-voltage side of the original circuit. In this way, the response speed of the detection output discharge pulse is greatly improved, so that the user can grasp the working state of the electric field.

[0022] like Figure 1 As shown, further, the rectifier unit 3 includes a first diode D1 and a voltage divider and current limiting part, the cathode of the first diode D1 is respectively connected to one end of the secondary coil 2 and one end of the voltage divider and current limiting part, the anode of the first diode D1 is grounded, and the other end of the voltage divider and current limiting part is connected to the base of the first transistor Q1; when the primary coil 1 detects that the load resistance of the primary circuit generates a voltage, the output voltage of the secondary coil 2 is rectified by the first diode D1, and then the rectified voltage is subjected to voltage divider and current limiting processing by the voltage divider and current limiting part to prevent the rectified voltage from breaking through the first transistor Q1, so that the first transistor Q1 stably enters the on state.

[0023] like Figure 1As shown, further, the voltage-dividing and current-limiting unit includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the cathode of the first diode D1, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2 and the base of the first transistor Q1, and the other end of the second resistor R2 is grounded; the rectified voltage of the first diode D1 is divided by the first resistor R1 and the second resistor R2, so that the rectified voltage will not break down the base of the first transistor Q1, ensuring that the first transistor Q1 can stably achieve conduction.

[0024] like Figure 1 As shown, further, the detection receiving unit 4 includes a voltage divider, a delay part and a receiving part, one end of the voltage divider is connected to the level supply end, the other end of the voltage divider is respectively connected to the collector of the first transistor Q1 and one end of the delay part, and the other end of the delay part is connected to the receiving part; when the first transistor Q1 is in the cut-off state, the level supply end, the voltage divider, the delay part and the receiving part form a loop, so that the receiving part detects the high level signal of the level supply end; when the first transistor Q1 enters the on state, the collector voltage of the first transistor Q1 will become 0.6V, at this time, the delay part is required to delay the low level signal of 0.6V to ensure that the receiving part can receive the low level signal, thereby improving the stability of the detection receiving unit 4 during operation.

[0025] like Figure 1 As shown, further, the voltage divider part includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the level supply end, the other end of the third resistor R3 is respectively connected to the collector of the first transistor Q1, one end of the delay part and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the receiving part; a conduction link is formed between the receiving part and the level supply end through the third resistor R3 and the fourth resistor R4, when the first transistor Q1 enters the cut-off state, the third resistor R3 and the fourth resistor R4 will guide the high-level voltage to flow in the direction of the receiving part, thereby realizing the detection action of the receiving part.

[0026] like Figure 1 As shown, further, the delay unit includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 and the second capacitor C2 are respectively connected to the collector of the first transistor Q1, and the other end of the first capacitor C1 and the second capacitor C2 are grounded; the charging and discharging principle of the first capacitor C1 and the second capacitor C2 is utilized to delay the 0.6V low-level signal generated by the collector of the first transistor Q1 to ensure that the receiving unit can stably receive the low-level signal and make a corresponding response action.

[0027] It should be noted that the level supply end may be a voltage source with an output voltage of 3.3V.

[0028] It should be noted that the receiving unit may be a microprocessor chip of the existing model STM32F103C8T6, and the existing microprocessor chip is used to form a receiving component so that the circuit can make other alarm responses.

[0029] The present application also provides a PCB board printed with the high-voltage pulse signal detection circuit as described above.

[0030] The present application also provides a detection device, which uses the high-voltage pulse signal detection circuit as described above to perform operation control.

[0031] To sum up, when working, the primary coil 1 of the current transformer LH1 is used to collect the voltage of the load resistor in the original circuit, and the output voltage of the secondary coil 2 is 0. The first transistor Q1 enters the cut-off state when there is no conduction voltage at the base. At this time, the high level of the level supply end directly flows into the detection receiving unit 4. When the detection receiving unit 4 receives a high level signal, it is determined that no flashover discharge has occurred on the high-voltage side of the original circuit; when the primary coil 1 of the current transformer LH1 detects the voltage of the load resistor in the original circuit, the secondary coil 2 will output a positive pulse voltage, and the first transistor Q1 receives the positive pulse at the base. When the voltage is high, it enters the on state. At this time, the high level at the level supply end flows to the collector of the first transistor Q1 and is derived from the emitter, while the detection receiving unit 4 has no high level signal input, that is, the signal received by the detection receiving unit 4 changes from a high level to a low level. When the detection receiving unit 4 receives a low level signal, it is determined that a flashover discharge occurs on the high-voltage side of the original circuit; the first transistor Q1 is used to detect the input voltage of the secondary coil 2 to determine whether a flashover discharge occurs on the high-voltage side of the original circuit. In this way, the response speed of the detection output discharge pulse is greatly improved, so that the user can grasp the working state of the electric field.

[0032] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the claims attached to the utility model.

Claims

1. A high voltage pulse signal detection circuit, characterized in that: It includes a current transformer LH1, a first transistor Q1, a level supply end, and a detection receiving unit. The current transformer LH1 is provided with a primary coil and a secondary coil. One end of the secondary coil is connected to a rectifier unit, and the other end of the secondary coil is grounded. The base of the first transistor Q1 is connected to the rectifier unit, the collector of the first transistor Q1 is respectively connected to the level supply end and the detection receiving unit, and the emitter of the first transistor Q1 is grounded.

2. The high voltage pulse signal detection circuit according to claim 1, characterized in that: The rectifier unit includes a first diode D1 and a voltage divider and current limiting part, the cathode of the first diode D1 is respectively connected to one end of the secondary coil and one end of the voltage divider and current limiting part, the anode of the first diode D1 is grounded, and the other end of the voltage divider and current limiting part is connected to the base of the first transistor Q1.

3. The high voltage pulse signal detection circuit according to claim 2, characterized in that: The voltage divider and current limiting unit includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the cathode of the first diode D1, the other end of the first resistor R1 is respectively connected to one end of the second resistor R2 and the base of the first transistor Q1, and the other end of the second resistor R2 is grounded.

4. The high voltage pulse signal detection circuit according to claim 1, characterized in that: The detection receiving unit includes a voltage divider, a delay part and a receiving part. One end of the voltage divider is connected to the level supply end, the other end of the voltage divider is respectively connected to the collector of the first transistor Q1 and one end of the delay part, and the other end of the delay part is connected to the receiving part.

5. The high voltage pulse signal detection circuit according to claim 4, characterized in that: The voltage divider includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the level supply end, the other end of the third resistor R3 is respectively connected to the collector of the first transistor Q1, one end of the delay part and one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the receiving part.

6. The high voltage pulse signal detection circuit according to claim 4, characterized in that: The delay unit includes a first capacitor C1 and a second capacitor C2. One end of the first capacitor C1 and the second capacitor C2 are respectively connected to the collector of the first transistor Q1, and the other end of the first capacitor C1 and the second capacitor C2 are grounded.

7. A PCB board, characterized in that: The PCB board is printed with the high-voltage pulse signal detection circuit as described in any one of claims 1-6.

8. A detection device, characterized in that: The detection device uses the high-voltage pulse signal detection circuit as described in any one of claims 1-6 to control its operation.

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