CN215072183U

CN215072183U - Bidirectional thyristor driven sub-resonance capacitor power supply with anti-resonance function

Info

Publication number: CN215072183U
Application number: CN202120629023.4U
Authority: CN
Inventors: 郑计平; 郭以贺; 谭明义
Original assignee: Jiangsu Huawang Rongzhi Technology Co ltd
Current assignee: Jiangsu Huawang Rongzhi Technology Co ltd
Priority date: 2021-03-29
Filing date: 2021-03-29
Publication date: 2021-12-07
Anticipated expiration: 2031-03-29

Abstract

The utility model discloses a bidirectional thyristor driven subresonance electric capacity gets power with anti resonance function relates to transformer transmission technical field, including alternating current bus voltage unit AC, the electric capacity unit C of being connected with alternating current bus voltage unit AC, the transformer unit T of being connected with electric capacity unit C, transformer unit T is connected with rectifier and filter circuit D, is connected with bidirectional thyristor unit H1 between transformer unit T and the rectifier and filter circuit D, and rectifier and filter circuit D is connected with output voltage sampling unit H2. The utility model provides an output voltage sampling unit H2 detectable rectification filter circuit D's output voltage value to accessible silicon controlled rectifier drive unit H3 and bidirectional thyristor unit H1 adjust the circuit between rectification filter circuit D and the transformer unit T, make rectification filter circuit unit D's output voltage remain stable.

Description

Bidirectional thyristor driven sub-resonance capacitor power supply with anti-resonance function

Technical Field

The utility model relates to a transformer transmission of electricity technical field especially relates to the power is got to bidirectional thyristor driven subresonance electric capacity with anti resonance function.

Background

The rectifier circuit is a circuit that converts ac power into dc power. The filter is a filter circuit consisting of a capacitor, an inductor and a resistor. The filter can effectively filter the frequency point of the specific frequency in the power line or the frequencies except the frequency point to obtain a power signal of the specific frequency or eliminate the power signal of the specific frequency. A transformer is a device that changes an alternating voltage using the principle of electromagnetic induction.

The 10KV high-voltage transmission line has the characteristics of large line current and severe load current change. The branch is many, and the line impedance changes violently. When the load current changes drastically, resonance of the power supply device is easily caused, and line resonance is formed. During resonance, the original PT power supply mode can cause over-voltage damage and even explosion of a PT (potential transformer). After the PT is damaged, the power cannot be supplied to the following controller, the controller loses power, the switch cannot be operated, the fault range may be expanded, and huge loss is brought.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main objective is in order to provide the subresonance electric capacity of bidirectional thyristor driven who has anti resonance function and gets the electric power, makes the transformer when meetting the short circuit, can avoid the damage of spare part on transformer and the relevant circuit.

The purpose of the utility model can be achieved by adopting the following technical scheme:

the bidirectional thyristor driven sub-resonance capacitor electricity-taking power supply with the anti-resonance function comprises an alternating current bus voltage unit AC, a capacitor unit C connected with the alternating current bus voltage unit AC, and a transformer unit T connected with the capacitor unit C, wherein the transformer unit T is connected with a rectification filter circuit D, the transformer unit T is also connected with a transformer primary current sampling unit G1 for detecting the input current value on the transformer unit T, the secondary side of the transformer unit T is also connected with a relay KA, a relay driving unit G2 is connected between the transformer primary current sampling unit G1 and the relay KA for receiving the detection value of the transformer primary current sampling unit G1 and opening and closing the relay KA, a bidirectional thyristor unit H1 is connected between the transformer unit T and the rectification filter circuit D, and the rectification filter circuit D is connected with an output voltage sampling unit H2, and a thyristor driving unit H3 is connected between the output voltage sampling unit H2 and the bidirectional thyristor unit H1, and is used for receiving the detection value of the output voltage sampling unit H2 and controlling the bidirectional thyristor unit H1.

Preferably, a coupler OC is connected between the capacitor unit C and the transformer unit T for data transmission.

Preferably, an arrester B is connected between the capacitor unit C and the transformer unit T, and the arrester B is grounded.

Preferably, the relay KA is connected between the transformer unit T and the triac unit H1, and the relay KA and the transformer primary current sampling unit G1 are both connected to ground.

Preferably, the rectifying and filtering circuit D includes a rectifying circuit unit and a filtering circuit unit, the transformer unit T is connected to the rectifying circuit unit, and the output voltage sampling unit H2 is configured to detect an output voltage value of the filtering circuit unit.

Preferably, the triac unit H1 is connected to a circuit between the transformer unit T and the rectifier circuit unit.

The utility model has the advantages of:

1. the utility model provides an output voltage sampling unit H2 detectable rectification filter circuit D's output voltage value to accessible silicon controlled rectifier drive unit H3 and bidirectional thyristor unit H1 adjust the circuit between rectification filter circuit D and the transformer unit T, make the DC voltage after the rectification filter remain stable.

2. The utility model provides a primary current value on transformer primary current sampling unit G1 detectable transformer unit T to accessible relay drive unit G2 and relay KA are with the current ground on the transformer, avoid transformer excessive pressure to overflow back transformer or other parts on its circuit to receive the damage.

Drawings

Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention clearer and clearer for those skilled in the art, the present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

As shown in fig. 1, the current-getting power supply of the triac driven sub-resonant capacitor with anti-resonant function provided in this embodiment includes an AC bus voltage unit AC for outputting AC power, a capacitor unit C connected to the AC bus voltage unit AC, a transformer unit T connected to the capacitor unit C for receiving and changing a voltage value of the AC power, a rectifying and filtering circuit D connected to the transformer unit T, a triac unit H1 connected between the transformer unit T and the rectifying and filtering circuit D, an output voltage sampling unit H2 connected to the rectifying and filtering circuit D for detecting an output voltage value of the rectifying and filtering circuit D, a triac driving unit H3 connected between the output voltage sampling unit H2 and the triac unit H1 for receiving a detection value of the output voltage sampling unit H2 and for controlling the triac unit H1,

when the output voltage sampling unit H2 detects that the output voltage value of the rectifying and filtering circuit D is unstable, the output voltage value is fed back to the thyristor driving unit H3, and the triac driving unit H1 is controlled by the thyristor driving unit H3 to adjust the output voltage value of the rectifying and filtering circuit D, so that the output voltage value of the rectifying and filtering circuit D tends to be stable.

In this embodiment, as shown in fig. 1, a transformer primary current sampling unit G1 is further connected to the transformer unit T for detecting an input current value of the transformer unit T, a relay KA is further connected to the secondary side of the transformer unit T, a relay driving unit G2 is connected between the transformer primary current sampling unit G1 and the relay KA for receiving a detection value of the transformer primary current sampling unit G1 and turning on/off the relay KA,

in the circuit, the relay KA is in a normally open state, when the transformer primary current sampling unit G1 detects that the current value of the AC bus voltage unit AC input transformer unit T is greater than a set upper limit value, the feedback is given to the relay driving unit G2, the relay KA is controlled to be in a closed state through the relay driving unit G2, overlarge current is grounded, the transformer unit T is prevented from being damaged, when the transformer primary current sampling unit G1 detects that the current value of the AC bus voltage unit AC input transformer unit T is less than the set upper limit value, the feedback is given to the relay driving unit G2, the relay KA is controlled to be in an open state through the relay driving unit G2, the transformer works normally, and the transformer short-circuit mode is divided into an AC short circuit mode and a rectified DC short circuit mode; the circuit can ensure that the transformer can still work normally, and can not generate resonance overvoltage and overcurrent, thereby avoiding fatal defects of explosion and the like of electric components used in the circuit due to the resonance overvoltage.

In this embodiment, as shown in fig. 1, a coupler OC is connected between the capacitor unit C and the transformer unit T for data transmission, and a communication circuit can be connected to facilitate transmission of the detected value of the AC bus voltage unit AC.

In this embodiment, as shown in fig. 1, a lightning arrester B is connected between the capacitor unit C and the transformer unit T, and the lightning arrester B is grounded, so that the safety is improved and lightning stroke is avoided.

In the present embodiment, as shown in fig. 1, the relay KA is connected to the circuit between the transformer unit T and the triac unit H1, and the relay KA and the transformer primary current sampling unit G1 are both grounded to ensure the safety of the electrical components and prevent the electrical components from being damaged.

In this embodiment, as shown in fig. 1, the rectifying and filtering circuit D includes a rectifying circuit unit and a filtering circuit unit, the filtering circuit unit is a filter, the transformer unit T is connected to the rectifying circuit unit, the output voltage sampling unit H2 is used for detecting the output voltage value of the filtering circuit unit, and the triac unit H1 is connected to the circuit between the transformer unit T and the rectifying circuit unit, so as to further refine the action position of the output voltage sampling unit H2.

In summary, in the present embodiment, the output voltage sampling unit H2 provided in the present embodiment can detect the output voltage value of the rectifying and filtering circuit D, and can adjust the circuit between the rectifying and filtering circuit D and the transformer unit T through the thyristor driving unit H3 and the triac unit H1, so that the rectified and filtered dc voltage is kept stable. The transformer primary current sampling unit G1 can detect the input current value on the transformer unit T, and can ground the current on the transformer through the relay driving unit G2 and the relay KA, so as to prevent the transformer or other parts on the circuit thereof from being damaged after the current of the transformer is too large.

The above description is only a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can replace or change the technical solution and the concept of the present invention within the scope of the present invention.

Claims

1. The power supply is got to bidirectional thyristor driven subresonance electric capacity with anti resonance function, its characterized in that: the device comprises an alternating current bus voltage unit AC, a capacitor unit C connected with the alternating current bus voltage unit AC, and a transformer unit T connected with the capacitor unit C, wherein the transformer unit T is connected with a rectifying and filtering circuit D, and is also connected with a transformer primary current sampling unit G1 for detecting the input current value on the transformer unit T, the secondary side of the transformer unit T is also connected with a relay KA, a relay driving unit G2 is connected between the transformer primary current sampling unit G1 and the relay KA for receiving the detection value of the transformer primary current sampling unit G1 and opening and closing the relay KA,

and a bidirectional thyristor unit H1 is connected between the transformer unit T and the rectifying and filtering circuit D, the rectifying and filtering circuit D is connected with an output voltage sampling unit H2 and used for detecting the output voltage value of the rectifying and filtering circuit D, and a thyristor driving unit H3 is connected between the output voltage sampling unit H2 and the bidirectional thyristor unit H1 and used for receiving the detection value of the output voltage sampling unit H2 and controlling the bidirectional thyristor unit H1.

2. The triac-driven subresonant capacitor power supply with an anti-resonance function according to claim 1, further comprising: and a coupler OC is connected between the capacitor unit C and the transformer unit T and is used for data transmission.

3. The triac-driven subresonant capacitor power supply with an anti-resonance function according to claim 1, further comprising: and an arrester B is connected between the capacitor unit C and the transformer unit T, and the arrester B is grounded.

4. The triac-driven subresonant capacitor power supply with an anti-resonance function according to claim 1, further comprising: the relay KA is connected between the transformer unit T and the bidirectional thyristor unit H1, and the relay KA and the transformer primary current sampling unit G1 are both connected to the ground.

5. The triac-driven subresonant capacitor power supply with an anti-resonance function according to claim 1, further comprising: the rectification filter circuit D comprises a rectification circuit unit and a filter circuit unit, the transformer unit T is connected with the rectification circuit unit, and the output voltage sampling unit H2 is used for detecting the output voltage value of the filter circuit unit.

6. The triac-driven subresonant capacitor power supply with an anti-resonance function according to claim 5, further comprising: the triac unit H1 is connected to a circuit between the transformer unit T and the rectifier circuit unit.