CN210514414U - High-voltage pulse detection circuit - Google Patents
High-voltage pulse detection circuit Download PDFInfo
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- CN210514414U CN210514414U CN201920841280.7U CN201920841280U CN210514414U CN 210514414 U CN210514414 U CN 210514414U CN 201920841280 U CN201920841280 U CN 201920841280U CN 210514414 U CN210514414 U CN 210514414U
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Abstract
The utility model discloses a high-voltage pulse detection circuit, which comprises a transformer, a diode, a first capacitor and a first resistor; one end of the primary side of the transformer is used for receiving high-voltage pulses, and the other end of the primary side of the transformer is connected to a high-voltage ground; one end of the secondary side of the transformer is connected with the anode of the diode, and the other end of the secondary side of the transformer is connected to a signal ground; the cathode of the diode is connected to signal ground through a parallel circuit formed by the first capacitor and the first resistor. The transformer is used for coupling the confirmation needle and the post-stage circuit, so that high-voltage ignition pulses flowing through the confirmation needle can be completely led into a high-voltage ground, arc discharge and ignition caused by the high-voltage ignition pulses are avoided, impact of the high-voltage ignition pulses on the post-stage circuit can be avoided, the service life of the detection circuit is prolonged, the stability of the detection circuit is improved, and the personal safety of a user is protected. The utility model discloses the wide application is in electronic circuit technical field.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit technique and specifically relates to a high-voltage pulse detection circuitry.
Background
High-voltage pulse type ignition devices are widely used for ignition of equipment such as gas cookers and gas water heaters, and in the process of testing, maintaining and repairing the ignition devices, the high-voltage ignition pulse signals generated by the ignition devices are often sampled, and the pulse number and the ignition time are extracted, so that the performance or fault points of the ignition devices are detected and analyzed.
The pulse signal output by the ignition device has very high voltage, which can cause impact on the sampling device, and the existing high-voltage pulse detection technology is difficult to effectively prevent the impact of the high-voltage pulse signal, so that the sampling device faces the danger of damage. Fig. 1 shows a conventional high voltage pulse detection circuit, in which a transformer and a firing pin are shown for generating a pulsed electric spark for ignition, and a confirmation pin is used for receiving the electric spark output from the firing pin and introducing the electric spark to a ground terminal through a photocoupler VB; the light emitting diode inside the photoelectric coupler VB is lightened when the pulse signal flows, the phototriode inside the photoelectric coupler VB is triggered to be conducted, the corresponding pulse signal output by the photoelectric coupler VB is supplied to the triode V1 for amplification and output, and finally output detection signals are received by a sampling device such as a single chip microcomputer and then are sampled and analyzed. One of the main principles of the high-voltage pulse detection circuit shown in fig. 1 is to isolate a pulse signal through a photoelectric coupler VB, so as to prevent the high-voltage pulse signal from damaging devices such as a triode, a singlechip and the like. The high voltage pulse detection circuit shown in fig. 1 has a disadvantage in that the voltage of the pulse signal may be as high as 10kV, and at this time, arcing and damage may occur between two pins of the light emitting diode inside the photoelectric coupler VB, and since the internal resistance of the light emitting diode inside the photoelectric coupler VB is large, it may not be possible to guide all the pulse signal to the ground terminal, so that the pulse signal is propagated to the phototriode inside the photoelectric coupler VB, thereby damaging the photoelectric coupler VB and the rear-stage circuits such as the triode and the single chip microcomputer. The above principles make the existing high-voltage pulse detection circuit have poor stability and reliability.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, an object of the present invention is to provide a high voltage pulse detection circuit.
The embodiment of the utility model provides an in the embodiment of the utility model provides a high-voltage pulse detection circuitry, including transformer, diode, first electric capacity and first resistance;
one end of the primary side of the transformer is used for receiving high-voltage pulses, and the other end of the primary side of the transformer is connected to a high-voltage ground; one end of the secondary side of the transformer is connected with the anode of the diode, and the other end of the secondary side of the transformer is connected to a signal ground;
the first capacitor is connected with the first resistor in parallel;
the cathode of the diode is connected to signal ground through a parallel circuit formed by the first capacitor and the first resistor.
Furthermore, the high-voltage pulse detection circuit further comprises a triode, a second resistor, a third resistor, a fourth resistor, a second capacitor and a third capacitor;
the second resistor is connected with the second capacitor in parallel;
the base electrode of the triode is connected with the cathode of the diode through a parallel circuit formed by the second resistor and the second capacitor; the base electrode of the triode is used for being connected to a power supply through the third resistor, and the collector electrode of the triode is used for being connected to the power supply through the fourth resistor; the collector of the triode is connected to the signal ground through the third capacitor; the emitter of the triode is connected to signal ground.
Furthermore, the high-voltage pulse detection circuit further comprises an operational amplifier, a fifth resistor, a fourth capacitor and an adjustable resistor;
the input end of the adjustable resistor is used for being connected to a power supply, and the output end of the adjustable resistor is connected with the inverting input end of the operational amplifier;
the non-inverting input end of the operational amplifier is connected with the collector electrode of the triode; the output end of the operational amplifier is used for being connected to a power supply through the fifth resistor; the output end of the operational amplifier is connected to the signal ground through the fourth capacitor.
Further, the high-voltage pulse detection circuit further comprises a sixth resistor and a light emitting diode; the anode of the light emitting diode is used for being connected to a power supply through the sixth resistor; and the cathode of the light emitting diode is connected with the output end of the operational amplifier.
Further, one end of the primary side of the transformer, which is used for receiving the high-voltage pulse, and one end of the secondary side of the transformer, which is connected with the anode of the diode, are homonymous ends.
Further, the transformer is a power frequency transformer.
Further, the number of turns of the primary side coil of the transformer is smaller than that of the secondary side coil.
The utility model has the advantages that: through using transformer coupling to confirm needle and back stage circuit, can all leading-in to high-pressure ground with the high-pressure pulse of striking sparks that flows through the confirmation needle, the arc that draws that avoids high-pressure pulse of striking sparks itself to lead to strikes sparks, can avoid high-pressure pulse of striking sparks to the impact of back stage circuit in addition, extension detection circuitry's life improves detection circuitry's stability, protection user's personal safety.
Drawings
Fig. 1 is a circuit diagram of a conventional high voltage pulse detection circuit;
fig. 2 is a circuit diagram of a high voltage pulse detection circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of a working flow of the high voltage pulse detection circuit according to an embodiment of the present invention.
Detailed Description
Referring to fig. 2, the high voltage pulse detection circuit described in this embodiment includes a transformer T1, a diode D1, a first capacitor C1, and a first resistor R1;
one end of the primary side of the transformer T1 is used for receiving a high-voltage pulse, and the other end of the primary side of the transformer T1 is connected to a high-voltage ground; one end of the secondary side of the transformer T1 is connected to the positive electrode of the diode D1, and the other end of the secondary side of the transformer T1 is connected to signal ground;
the first capacitor C1 is connected with a first resistor R1 in parallel;
the cathode of the diode D1 is connected to signal ground through a parallel circuit formed by the first capacitor C1 and the first resistor R1.
In this embodiment, the high-voltage pulse detection circuit is used to detect a high-voltage ignition pulse generated by a high-voltage pulse type ignition device used in a gas cooker, a gas water heater, and other devices. In particular, the high voltage pulse type ignition device uses a step-up transformer or other high voltage generating device to obtain a high voltage, and applies the high voltage to the firing pin, so that the firing pin has a high voltage relative to a high voltage ground. When the detection circuit of the present embodiment is used, one end of the primary side of the transformer T1 is connected to the firing pin, and the other end of the primary side of the transformer T1 is connected to a high voltage ground, so that when the firing pin approaches the firing pin, the air between the firing pin and the confirmation pin is broken down and discharged to generate an electric spark pulse, and the confirmation pin receives a pulse signal which is a high voltage pulse current.
In this embodiment, the transformer T1 used is a commercial transformer T1, and the number of turns of the primary side coil is smaller than that of the secondary side coil, and the primary side coil is wound with a wire having a larger wire diameter, and the secondary side coil is wound with a wire having a smaller wire diameter. At this time, since the primary side resistance of the transformer T1 is small and the number of turns is small, the primary side of the transformer T1 can introduce all of the high-voltage pulse current received by the validation pin to the high-voltage ground.
In this embodiment, the transformer T1 used may have a transformation ratio of primary side 12V: secondary side 220V or primary side 15V: secondary side 110V. The transformer T1 boosts the pulse signal and outputs the boosted pulse signal from the secondary side of the transformer T1. One end of the secondary side of the transformer T1 is connected to the positive electrode of the diode D1, and the other end of the secondary side of the transformer T1 is connected to signal ground. Preferably, referring to fig. 2, a terminal of the primary side of the transformer T1 for receiving a high voltage pulse and a terminal of the secondary side of the transformer T1 connected to the positive electrode of the diode D1 are dotted terminals.
In this embodiment, the signal ground and the high-voltage ground are concepts for distinguishing two ground terminals isolated from each other, and it is not limited that the voltage of the high-voltage ground or the voltage of each part of the circuit where the high-voltage ground is located is higher than the voltage of the signal ground or the voltage of each part of the circuit where the signal ground is located.
The first diode D1 rectifies the pulse signal output by the transformer T1, and the first capacitor C1 and the first resistor R1 filter and limit the voltage of the pulse signal. In this embodiment, the pulse signal at the negative electrode of the first diode D1 may be further shaped and then input to a sampling device such as a single chip, and the sampling device performs sampling detection on the pulse signal.
The technical effect of detection circuitry's this embodiment lies in, uses transformer T1 coupling to confirm needle and back stage circuit, can be with the whole leading-in to high-pressure ground of the high-pressure pulse of striking sparks that flows through the confirmation needle, avoids the arc that draws that the high-pressure pulse of striking sparks itself leads to strike sparks, can avoid the high-pressure pulse of striking sparks to the impact of back stage circuit in addition, prolongs detection circuitry's life, improves detection circuitry's stability, protection user's personal safety.
Further as a preferred implementation manner, referring to fig. 2, the high-voltage pulse detection circuit described in this embodiment further includes a transistor Q1, a second resistor R2, a third resistor R3, a fourth resistor R4, a second capacitor C2, and a third capacitor C3;
the second resistor R2 is connected with a second capacitor C2 in parallel;
the base of the triode Q1 is connected with the cathode of the diode D1 through a parallel circuit formed by the second resistor R2 and the second capacitor C2; the base of the triode Q1 is used for being connected to a power supply through the third resistor R3, and the collector of the triode Q1 is used for being connected to the power supply through the fourth resistor R4; the collector of the transistor Q1 is connected to the signal ground through the third capacitor C3; the emitter of the transistor Q1 is connected to signal ground.
In this embodiment, the third resistor R3 and the fourth resistor R4 are used to form a bias circuit of the transistor Q1, and the second resistor R2 and the second capacitor C2 are used to rectify and limit the pulse signal output by the diode D1, and input the pulse signal into the transistor Q1 for signal amplification. The collector of the triode Q1 outputs an amplified pulse signal, which is filtered by a third capacitor C3.
The triode Q1, the second resistor R2, the third resistor R3, the fourth resistor R4, the second capacitor C2 and the third capacitor C3 form an amplifying circuit, and the pre-amplifying circuit can amplify the pulse signal output by the diode D1. When the sampling signal input end of a sampling device such as a single chip microcomputer is connected with the collector electrode of the triode Q1, the amplified pulse signal can be obtained, and the sampling result is more accurate.
Further as a preferred implementation manner, referring to fig. 2, the high voltage pulse detection circuit described in this embodiment further includes an operational amplifier U1, a fifth resistor R5, a fourth capacitor C4, and an adjustable resistor RJ 1;
the input end of the adjustable resistor RJ1 is used for being connected to a power supply, and the output end of the adjustable resistor RJ1 is connected with the inverting input end of the operational amplifier U1;
the non-inverting input end of the operational amplifier U1 is connected with the collector of the triode Q1; the output end of the operational amplifier U1 is used for being connected to a power supply through the fifth resistor R5; the output terminal of the operational amplifier U1 is connected to signal ground through the fourth capacitor C4.
In this embodiment, depending on the specific type of the operational amplifier U1, the operational amplifier U1 may further have a power supply terminal and a ground terminal, and the power supply terminal of the operational amplifier U1 needs to be connected to the +12V or +5V power supply, and the ground terminal of the operational amplifier U1 needs to be connected to the signal ground.
The operational amplifier U1, the fifth resistor R5, the fourth capacitor C4 and the adjustable resistor RJ1 form a comparator. The adjustable resistor RJ1 is used for adjusting the voltage division obtained at the inverting input terminal of the operational amplifier U1, thereby forming the reference voltage of the comparator. An amplifying circuit formed by the triode Q1, the second resistor R2, the third resistor R3, the fourth resistor R4, the second capacitor C2 and the third capacitor C3 can be used as a pre-amplifying circuit of the comparator, amplified pulse signals are input to a non-inverting input end of the operational amplifier U1, an output end of the operational amplifier U1 outputs a voltage comparison result, and the voltage comparison result can be directly used as a detection signal and transmitted to a sampling signal input end of a sampling device such as a single chip microcomputer for sampling analysis.
Further as a preferred implementation manner, referring to fig. 2, the high voltage pulse detection circuit described in this embodiment further includes a sixth resistor R6 and a light emitting diode LED; the anode of the light emitting diode LED is used for being connected to a power supply through the sixth resistor R6; and the cathode of the light emitting diode LED is connected with the output end of the operational amplifier U1.
When the detection signal is at a low level, the light emitting diode LED is conducted to emit light; when the detection signal is high, the light emitting diode LED does not emit light. The light emitting diode LED can visually display the detection signal.
In summary, the structure and principle of the circuit shown in FIG. 2 are shown in FIG. 3. The transformer T1, the diode D1, the first capacitor C1, and the first resistor R1 constitute a detection portion of the detection circuit of this embodiment, the triode Q1, the second resistor R2, the third resistor R3, the fourth resistor R4, the second capacitor C2, and the third capacitor C3 constitute a pre-amplification portion of the detection circuit of this embodiment, and the operational amplifier U1, the fifth resistor R5, the fourth capacitor C4, and the adjustable resistor RJ1 constitute a comparator portion of the detection circuit of this embodiment. The detection part is used for coupling the confirmation needle and the post-stage circuit and acquiring a pulse signal of the confirmation needle, the pre-amplification part is used for pre-amplifying the pulse signal acquired by the detection part, and the comparator part is used for comparing the voltage of the pre-amplified pulse signal so as to output a detection signal adapted to the single chip microcomputer.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of the constituent parts of the present disclosure in the drawings. As used in this disclosure, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, unless defined otherwise, all technical and scientific terms used in this example have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this embodiment, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as, "etc.), provided with the present embodiments is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, as long as it achieves the technical effects of the present invention by the same means, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention. The technical solution and/or the embodiments of the invention may be subject to various modifications and variations within the scope of the invention.
Claims (7)
1. A high-voltage pulse detection circuit is characterized by comprising a transformer, a diode, a first capacitor and a first resistor;
one end of the primary side of the transformer is used for receiving high-voltage pulses, and the other end of the primary side of the transformer is connected to a high-voltage ground; one end of the secondary side of the transformer is connected with the anode of the diode, and the other end of the secondary side of the transformer is connected to a signal ground;
the first capacitor is connected with the first resistor in parallel;
the cathode of the diode is connected to signal ground through a parallel circuit formed by the first capacitor and the first resistor.
2. The high voltage pulse detection circuit according to claim 1, further comprising a transistor, a second resistor, a third resistor, a fourth resistor, a second capacitor and a third capacitor;
the second resistor is connected with the second capacitor in parallel;
the base electrode of the triode is connected with the cathode of the diode through a parallel circuit formed by the second resistor and the second capacitor; the base electrode of the triode is used for being connected to a power supply through the third resistor, and the collector electrode of the triode is used for being connected to the power supply through the fourth resistor; the collector of the triode is connected to the signal ground through the third capacitor; the emitter of the triode is connected to signal ground.
3. The high voltage pulse detection circuit according to claim 2, further comprising an operational amplifier, a fifth resistor, a fourth capacitor and an adjustable resistor;
the input end of the adjustable resistor is used for being connected to a power supply, and the output end of the adjustable resistor is connected with the inverting input end of the operational amplifier;
the non-inverting input end of the operational amplifier is connected with the collector electrode of the triode; the output end of the operational amplifier is used for being connected to a power supply through the fifth resistor; the output end of the operational amplifier is connected to the signal ground through the fourth capacitor.
4. The high voltage pulse detection circuit according to claim 3, further comprising a sixth resistor and a light emitting diode; the anode of the light emitting diode is used for being connected to a power supply through the sixth resistor; and the cathode of the light emitting diode is connected with the output end of the operational amplifier.
5. The circuit of claim 3, wherein the terminal of the primary side of the transformer for receiving the high voltage pulse and the terminal of the secondary side of the transformer connected to the positive electrode of the diode are homonymous terminals.
6. The circuit for detecting high voltage pulses according to any one of claims 1 to 5, wherein said transformer is a line frequency transformer.
7. The circuit of any one of claims 1-5, wherein the number of turns of the primary side of the transformer is less than the number of turns of the secondary side of the transformer.
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|---|---|---|---|
| CN201920841280.7U CN210514414U (en) | 2019-06-04 | 2019-06-04 | High-voltage pulse detection circuit |
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| CN201920841280.7U CN210514414U (en) | 2019-06-04 | 2019-06-04 | High-voltage pulse detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325040A (en) * | 2021-12-06 | 2022-04-12 | 东莞声索电子有限公司 | Pulse voltage detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114325040A (en) * | 2021-12-06 | 2022-04-12 | 东莞声索电子有限公司 | Pulse voltage detection circuit |
| CN114325040B (en) * | 2021-12-06 | 2024-06-04 | 东莞声索电子有限公司 | Pulse voltage detection circuit |
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