CN216794860U - Voltage clamping control circuit - Google Patents
Voltage clamping control circuit Download PDFInfo
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- CN216794860U CN216794860U CN202220373916.1U CN202220373916U CN216794860U CN 216794860 U CN216794860 U CN 216794860U CN 202220373916 U CN202220373916 U CN 202220373916U CN 216794860 U CN216794860 U CN 216794860U
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Abstract
The utility model discloses a voltage clamping control circuit, comprising: the first branch circuit and the second branch circuit are externally connected with alternating current through a port A and a port K; one end of the first branch circuit is respectively connected with the port A of the alternating current and the negative electrode of the diode D3, and the other end of the first branch circuit is respectively connected with the port K of the alternating current, one end of the resistor R2, the energy storage capacitor C1 and the negative electrode of the voltage regulator tube D4; the other end of the resistor R2 is respectively connected with the other end of the energy storage capacitor C1, the anode of the diode D3 and the anode of the voltage regulator tube D4; one end of the resistor R3 is connected with the anode of a voltage regulator tube D4, and the other end of the resistor R3 is connected with the emitting electrode and the base electrode of the phototriode Q1; the collector of the phototriode Q1 is connected with the port K of the alternating current. According to the utility model, the charging loop and the discharging loop are arranged, the charging loop charges the energy storage capacitor C1, and the discharging loop finishes discharging the energy storage capacitor C1 through the phototriode Q1 and the resistor R3, so that the clamping voltage can be controlled, and the anti-interference capability of the high-potential board card is improved.
Description
Technical Field
The utility model belongs to the field of electromagnetic interference, and relates to a voltage clamping control circuit.
Background
The extra-high voltage direct current transmission has the advantages of long transmission distance, large transmission capacity and low loss, and a high-potential board card for the converter valve is a main component for directly controlling and monitoring the voltage state of the converter valve. The high-potential board card mainly has the functions of controlling, monitoring and protecting the thyristor and is generally positioned in the thyristor level, so that the high-potential board card works in the environment of a strong magnetic field and a large electric field. Under the environment of strong electromagnetic field, the electrical performance of the electronic element is easily affected, which causes the performance of the high-potential board card to change, affects the working reliability of the high-potential board card, and even causes the fault of the current conversion system, thereby causing the power failure accident.
The clamping circuit in the high-potential board card for the existing light-operated converter valve adopts a voltage clamping circuit which is formed on the basis of a voltage stabilizing diode or a triode, the circuit is simple in design, easy to realize and low in cost, but the circuit is only suitable for controlling the clamping voltage value in the board card, and if remote control is needed, the circuit has a plurality of difficulties particularly in realizing remote control in a high-voltage direct-current power transmission converter valve.
In the actual operation process of the converter valve, if the scheme is applied, the control of the clamping voltage value is required to be carried out through a remote optical signal, compared with the prior art, a circuit is additionally designed to realize the control of the clamping voltage value, and in addition, the installation cost of the scheme is greatly increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems in the prior art and provides a voltage clamping control circuit which can improve the anti-electromagnetic interference capability of a high-potential board card for a light-operated converter valve.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
a voltage clamp control circuit comprising: a charging circuit and a discharging circuit;
the charging circuit comprises a first branch and a second branch; the first branch circuit and the second branch circuit are externally connected with alternating current through a port A and a port K; the first branch is used for a positive phase path of alternating current; the second branch circuit is used for a negative phase path of alternating current; the second branch circuit comprises a resistor R2, a diode D3, an energy storage capacitor C1 and a voltage regulator tube D4;
one end of the first branch circuit is respectively connected with the port A of the alternating current and the negative electrode of the diode D3, and the other end of the first branch circuit is respectively connected with the port K of the alternating current, one end of the resistor R2, the energy storage capacitor C1 and the negative electrode of the voltage regulator tube D4; the other end of the resistor R2 is respectively connected with the other end of the energy storage capacitor C1, the anode of the diode D3 and the anode of the voltage regulator tube D4; the energy storage capacitor C1 is connected with the voltage stabilizing tube D4 in parallel;
the discharging loop comprises a phototriode Q1 and a resistor R3, one end of the resistor R3 is connected with the anode of a voltage regulator tube D4, and the other end of the resistor R3 is connected with the emitting electrode and the base electrode of a phototriode Q1; the collector of the phototransistor Q1 is connected to a port K for ac power.
The utility model is further improved in that:
the first branch comprises a voltage regulator tube D1 and a voltage regulator tube D2; and the voltage-stabilizing tube D1 is connected with the voltage-stabilizing tube D2 in series in an opposite direction.
A voltage-stabilizing tube D1 and a voltage-stabilizing tube D2 are reversely connected in series, so that the anode of the voltage-stabilizing tube D1 is connected with the anode of the voltage-stabilizing tube D2; the negative electrode of the voltage-regulator tube D2 is respectively connected with the port K of alternating current, one end of the resistor R2, the energy-storage capacitor C1 and the negative electrode of the voltage-regulator tube D4; and the cathode of the voltage-stabilizing tube D1 is connected with the port A of the alternating current and the cathode of the diode D3.
Diode D3 is a schottky diode. The phototransistor Q1 is NPN.
The charging circuit further comprises a resistor R1, and one end of the resistor R1 is connected with the negative electrode of the voltage regulator tube D1 to form a port A; the other end of the resistor R1 is connected with the cathode of the diode D3.
The resistances of the resistor R1, the resistor R2 and the resistor R3 are the same. Diode D1, diode D2, and diode D4 are the same type of zener diode.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, the charging loop and the discharging loop are arranged, the charging loop charges the energy storage capacitor C1, and the discharging loop finishes discharging the energy storage capacitor C1 through the phototriode Q1 and the resistor R3, so that the control of the voltage value of the clamping voltage can be realized, and the anti-interference capability of the high-potential board card is improved.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a diagram of a voltage clamp control circuit according to an embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, the description is only for convenience and simplicity, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the present invention discloses a voltage clamp control circuit, comprising: a charging circuit and a discharging circuit;
the charging circuit comprises a first branch and a second branch; the first branch is used for a positive phase path of alternating current; when the alternating current is in a positive phase, the first branch and the alternating current applied to the port A and the port K form a loop to complete positive phase conduction of the alternating current; the second branch circuit is used for a negative phase path of alternating current; when the alternating current is in negative phase, the second branch forms a loop with the alternating current applied to the port a and the port K. And the resistor R2, the diode D3, the energy storage capacitor C1 and the voltage regulator tube D4 in the second branch are conducted.
One end of the first branch circuit is respectively connected with an alternating current port A and the negative electrode of a diode D3, and the other end of the first branch circuit is respectively connected with an alternating current port K, one end of a resistor R2, an energy storage capacitor C1 and the negative electrode of a voltage regulator tube D4; the other end of the resistor R2 is respectively connected with the other end of the energy storage capacitor C1, the anode of the diode D3 and the anode of the voltage regulator tube D4; the energy storage capacitor C1 is connected with the voltage regulator tube D4 in parallel;
the alternating current charges the energy storage capacitor C1 through the charging resistor R2, and when the charged voltage value exceeds the clamping voltage of the voltage stabilizing diode D4, the exceeding voltage part passes through the anode of the diode D3, and negative phase conduction of the alternating current is completed.
The discharging loop comprises a phototriode Q1 and a resistor R3, one end of the resistor R3 is connected with the anode of a voltage regulator tube D4, and the other end of the resistor R3 is connected with the emitting electrode and the base electrode of a phototriode Q1; the collector of the phototriode Q1 is connected with a port K of alternating current.
When the clamping circuit discharges, the energy storage capacitor C1 completes the discharge of the energy storage capacitor through the phototransistor Q1 and the resistor R3.
The first branch comprises a voltage regulator tube D1 and a voltage regulator tube D2; a voltage regulator tube D1 is connected in series with a voltage regulator tube D2 in an inverted manner. A voltage-stabilizing tube D1 and a voltage-stabilizing tube D2 are reversely connected in series, so that the anode of the voltage-stabilizing tube D1 is connected with the anode of the voltage-stabilizing tube D2; the negative electrode of the voltage-stabilizing tube D2 is respectively connected with the port K of the alternating current, one end of the resistor R2, the energy-storage capacitor C1 and the negative electrode of the voltage-stabilizing tube D4; the cathode of the voltage-stabilizing tube D1 is connected with the port A of the alternating current and the cathode of the diode D3. When the first branch circuit is a voltage regulator tube D1 and a voltage regulator tube D2 which are connected in series in the reverse direction, the effect of forward and reverse voltage regulation clamping can be achieved.
The diode D3 is a Schottky diode, and the Schottky diode has the characteristics of large current resistance, small self power consumption, high efficiency and high surge current resistance. The phototriode Q1 is NPN type, one end of the resistor R1 is connected with the port A together with the negative electrode of the voltage regulator tube D1; the other end of the resistor R1 is connected with the cathode of the diode D3, and the resistor R1 is used for a voltage division protection circuit. Diode D1, diode D2, and diode D4 are the same type of zener diodes. The resistances of the resistor R1, the resistor R2 and the resistor R3 are the same.
The working principle of the voltage clamping control circuit is as follows:
before the voltage clamping control circuit works, alternating voltage needs to be applied to the two ends of the port A and the port K, and in a converter valve system, the two ends of a converter valve bear direct current voltage and alternating current voltage, so that the operating condition of the circuit is met just. The first branch and the alternating current applied between the port A and the port K form a loop and act on a positive phase path of the alternating current; meanwhile, the alternating current charges the energy storage capacitor C1 through the charging resistor R2, and the finally charged voltage value is determined by the voltage stabilizing diode D4. When the voltage clamp control circuit needs to control signal output, the remote control end needs to control light signal output to the phototriode Q1, so that the phototriode Q1 is turned on, and at the moment, the energy storage capacitor C1 completes discharge of the energy storage capacitor through the phototriode Q1 and the resistor R3. During the discharge of the storage capacitor, the collector of the phototransistor Q1 gradually increases in voltage relative to port K. A depletion type MOS tube is required to be connected behind the circuit, and the gate-source voltage value (Vgs) conduction value of the MOS tube is a negative value. When the clamping voltage value is gradually increased and meets the voltage value of the control circuit, the corresponding logic control function is realized.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A voltage clamp control circuit, comprising: a charging circuit and a discharging circuit;
the charging loop comprises a first branch and a second branch;
the first branch circuit and the second branch circuit are externally connected with alternating current through a port A and a port K; the first branch is used for a positive phase path of alternating current; the second branch circuit is used for a negative phase path of alternating current; the second branch circuit comprises a resistor R2, a diode D3, an energy storage capacitor C1 and a voltage regulator tube D4;
one end of the first branch circuit is respectively connected with an alternating current port A and the negative electrode of a diode D3, and the other end of the first branch circuit is respectively connected with an alternating current port K, one end of a resistor R2, an energy storage capacitor C1 and the negative electrode of a voltage regulator tube D4; the other end of the resistor R2 is connected with the other end of the energy storage capacitor C1, the anode of the diode D3 and the anode of the voltage regulator tube D4 respectively; the energy storage capacitor C1 is connected with the voltage regulator tube D4 in parallel;
the discharging loop comprises a phototriode Q1 and a resistor R3, one end of the resistor R3 is connected with the anode of a voltage regulator tube D4, and the other end of the resistor R3 is connected with the emitter and the base of a phototriode Q1; the collector of the phototriode Q1 is connected with a port K of alternating current.
2. The voltage clamp control circuit of claim 1, wherein the first branch comprises a regulator D1 and a regulator D2; and the voltage-stabilizing tube D1 is connected with the voltage-stabilizing tube D2 in series in an opposite direction.
3. The voltage clamp control circuit of claim 2, wherein the stabilivolt D1 is connected in series with a stabilivolt D2 in reverse order such that the anode of the stabilivolt D1 is connected to the anode of the stabilivolt D2; the negative electrode of the voltage-regulator tube D2 is respectively connected with the port K of alternating current, one end of the resistor R2, the energy-storage capacitor C1 and the negative electrode of the voltage-regulator tube D4; the cathode of the voltage-stabilizing tube D1 is connected with the port A of the alternating current and the cathode of the diode D3.
4. The voltage-clamp control circuit of claim 1, wherein the diode D3 is a Schottky diode.
5. The voltage-clamp control circuit of claim 1, wherein the phototransistor Q1 is NPN.
6. The voltage clamp control circuit of claim 1, wherein the charging loop further comprises a resistor R1, one end of the resistor R1 is connected to the port A together with the negative electrode of the voltage regulator tube D1; the other end of the resistor R1 is connected with the cathode of the diode D3.
7. The voltage clamp control circuit of claim 6, wherein the resistors R1, R2 and R3 have the same resistance.
8. The voltage-clamp control circuit of claim 1, wherein the diode D1, the diode D2, and the diode D4 are the same type of zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220373916.1U CN216794860U (en) | 2022-02-22 | 2022-02-22 | Voltage clamping control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220373916.1U CN216794860U (en) | 2022-02-22 | 2022-02-22 | Voltage clamping control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216794860U true CN216794860U (en) | 2022-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220373916.1U Active CN216794860U (en) | 2022-02-22 | 2022-02-22 | Voltage clamping control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216794860U (en) |
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- 2022-02-22 CN CN202220373916.1U patent/CN216794860U/en active Active
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