CN215990293U - Novel medium-voltage alternating-current power supply circuit - Google Patents
Novel medium-voltage alternating-current power supply circuit Download PDFInfo
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- CN215990293U CN215990293U CN202122303117.5U CN202122303117U CN215990293U CN 215990293 U CN215990293 U CN 215990293U CN 202122303117 U CN202122303117 U CN 202122303117U CN 215990293 U CN215990293 U CN 215990293U
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Abstract
The utility model discloses a novel medium-voltage alternating-current power supply circuit, wherein a medium-voltage alternating-current power supply phase line is connected with the ground through a high-voltage capacitor series voltage dependent resistor, and a power supply processing circuit is connected with the voltage dependent resistor in parallel. The medium-voltage alternating current power supply passes through the high-voltage capacitor and then passes through the power taking processing circuit which is connected with the input end of the micro current transformer and the input end of the rectifier bridge in series. The micro current transformer outputs a current monitoring signal, the rectifier bridge direct current output charges the energy storage capacitor through the diode, and the energy storage capacitor outputs a direct current voltage-stabilizing working power supply after passing through the switching power supply circuit for the weak current circuit. The voltage of the energy storage capacitor is processed and then a control signal is output, the MOS tube is controlled to short-circuit and open the output two ends of the rectifier bridge, and the charging process of the energy storage capacitor is controlled so as to ensure the voltage stability of the energy storage capacitor.
Description
Technical Field
The utility model relates to the technical field of medium and high voltage switch equipment, in particular to the field of medium and high voltage switch equipment with primary and secondary fusion.
Background
At present, the smart grid technology based on the one-time and two-time integration is developed vigorously, and aiming at low-voltage power supplies required by the operation of various grid-associated equipment, the main solution is to supply power in a centralized manner through a PT unit, and various grid-associated weak-current equipment obtains a direct-current voltage-stabilized working power supply through the transformation of the low-voltage power supply provided by a PT. The smart grid has more and more weak electric devices and is distributed more and more widely. In many cases, these weak electric devices do not consume much power, and when they are used independently, they are not economical because they are equipped with PT units, and the PT units also occupy a large installation space, which is not favorable for system integration.
Disclosure of Invention
In order to solve the problems, the utility model provides a novel medium-voltage alternating current power supply circuit, wherein a medium-voltage alternating current power supply is grounded (earth) through a high-voltage capacitor, a miniature current transformer and a rectifier bridge in series, and a piezoresistor is connected in parallel on the current transformer and rectifier bridge series circuit to serve as protection grounding. The micro current transformer outputs a current monitoring signal, the rectifier bridge direct current output charges the energy storage capacitor through the switch diode, and the energy storage capacitor outputs a direct current voltage stabilization working power supply through the switch power supply. The voltage of the energy storage capacitor is processed and then a control signal is output to control the MOS tube, so that the anode and the cathode of the direct current output end of the rectifier bridge are short-circuited or disconnected. Namely, the charging process of the energy storage capacitor is controlled by switching on and off the direct current output end of the rectifier bridge, and the voltage stability of the energy storage capacitor is ensured.
The specific scheme of the utility model is as follows:
a novel medium-voltage alternating-current power supply circuit comprises a high-voltage capacitor C1, a voltage dependent resistor VR, a miniature current transformer TA, a rectifier bridge B, MOS tube K, a diode D, an energy storage capacitor C2, a current signal monitoring circuit, a voltage sampling circuit, a return difference comparison circuit, a driving circuit and a switching power supply circuit; the single-phase medium-voltage alternating current power supply is respectively connected with one end of a piezoresistor VR and one end of a micro current transformer TA input coil through a high-voltage capacitor C1, the other end of the micro current transformer TA input coil is connected with one alternating current input port of a rectifier bridge B, and the other alternating current input port of the rectifier bridge B is connected with the other end of the piezoresistor VR and then connected with the ground; an output coil of the micro current transformer TA is connected with a current signal monitoring circuit, the positive end and the negative end of the direct current output of the rectifier bridge B are respectively connected with the drain electrode and the source electrode of the MOS transistor K, and the positive end of the direct current output is connected with the positive electrode of an energy storage capacitor C2 through a diode D; the positive electrode of the energy storage capacitor C2 is connected with a switching power supply circuit, the switching power supply circuit outputs a direct current stabilized power supply for a weak current circuit, the positive electrode of the energy storage capacitor C2 is connected with a voltage sampling circuit, a voltage sampling signal output by the voltage sampling circuit outputs a control signal through a return difference comparison circuit, and the control signal is connected with the grid electrode of the MOS tube K through a driving circuit to control the conduction and the cut-off of the MOS tube K.
Selecting a high-voltage capacitor according to different medium-voltage alternating-current power supply voltage grades and power supply power requirements; the high-voltage capacitor is formed by connecting a single high-voltage capacitor or a plurality of high-voltage capacitors in series or in parallel so as to meet different power requirements and different voltage grade requirements of a power supply.
When the medium-voltage alternating-current power supply is powered by three phases, the three-phase medium-voltage alternating-current power supply is divided into three paths to be respectively connected with a high-voltage capacitor, a piezoresistor, a miniature current transformer, a rectifier bridge and a current monitoring circuit; and the three rectifier bridge direct current outputs are connected in parallel and then charge the energy storage capacitor through a diode.
Drawings
Fig. 1 is a novel medium voltage ac power supply circuit.
Detailed Description
Referring to fig. 1, a novel medium-voltage ac power supply circuit includes a high-voltage capacitor C1, a voltage dependent resistor VR, a micro current transformer TA, a rectifier bridge B, MOS tube K, a diode D, an energy storage capacitor C2, a current signal monitoring circuit, a voltage sampling circuit, a return difference comparison circuit, a driving circuit, and a switching power supply circuit; the single-phase medium-voltage alternating current power supply is respectively connected with one end of a piezoresistor VR and one end of a micro current transformer TA input coil through a high-voltage capacitor C1, the other end of the micro current transformer TA input coil is connected with one alternating current input port of a rectifier bridge B, and the other alternating current input port of the rectifier bridge B is connected with the other end of the piezoresistor VR and then connected with the ground; an output coil of the micro current transformer TA is connected with a current signal monitoring circuit, the positive end and the negative end of the direct current output of the rectifier bridge B are respectively connected with the drain electrode and the source electrode of the MOS transistor K, and the positive end of the direct current output is connected with the positive electrode of an energy storage capacitor C2 through a diode D; the positive electrode of the energy storage capacitor C2 is connected with a switching power supply circuit, the switching power supply circuit outputs a direct current stabilized power supply for a weak current circuit, the positive electrode of the energy storage capacitor C2 is connected with a voltage sampling circuit, a voltage sampling signal output by the voltage sampling circuit outputs a control signal through a return difference comparison circuit, and the control signal is connected with the grid electrode of the MOS tube K through a driving circuit to control the conduction and the cut-off of the MOS tube K.
Selecting a high-voltage capacitor C1 according to different medium-voltage alternating-current power supply voltage grades and power supply power requirements; the high-voltage capacitor C1 is composed of a single high-voltage capacitor or a plurality of high-voltage capacitors connected in series or in parallel to meet different power requirements and different voltage grade requirements of power supplies.
When the three phases of the medium-voltage alternating-current power supply get electricity, the three-phase medium-voltage alternating-current power supply is divided into three paths to be respectively connected with a high-voltage capacitor C1, a voltage dependent resistor VR, a micro current transformer TA, a rectifier bridge B and a current monitoring circuit; the three-way rectifier bridge direct current output is connected in parallel and then charges an energy storage capacitor C2 through a diode D, the voltage of the energy storage capacitor C2 is processed through a voltage sampling circuit and a return difference comparison circuit, the MOS transistor K is controlled to be switched on and switched off through a driving circuit, the charging process of the energy storage capacitor C2 is controlled, and the voltage of the energy storage capacitor C2 is stable.
In the implementation process of the embodiment, the high-voltage capacitor C1 is formed by connecting 18 220nF/2000V high-voltage capacitors in series, the voltage-sensitive resistor VR protects the voltage to be 470V, and the return difference comparison circuit is adjusted, so that the energy storage voltage of the energy storage capacitor C2 is set to be 290V-315V. The novel medium-voltage alternating-current power supply circuit is used for a 10kV power grid system, can obtain 7W power supply power in a single phase at most, can obtain 21W power supply power in a three phase at most, and can completely meet the power supply requirements of various weak current small systems.
Claims (3)
1. A novel medium-voltage alternating-current power supply circuit is characterized by comprising a high-voltage capacitor C1, a piezoresistor VR, a micro current transformer TA, a rectifier bridge B, MOS tube K, a diode D, a capacitor C2, a current signal monitoring circuit, a voltage sampling circuit, a return difference comparison circuit, a driving circuit and a switching power supply circuit; the single-phase medium-voltage alternating current power supply is respectively connected with one end of a piezoresistor VR and one end of a micro current transformer TA input coil through a high-voltage capacitor C1, the other end of the micro current transformer TA input coil is connected with one alternating current input port of a rectifier bridge B, and the other alternating current input port of the rectifier bridge B is connected with the other end of the piezoresistor VR and then connected with the ground; an output coil of the micro current transformer TA is connected with a current signal monitoring circuit, the positive end and the negative end of the direct current output of the rectifier bridge B are respectively connected with the drain electrode and the source electrode of the MOS transistor K, and the positive end of the direct current output is connected with the positive electrode of a capacitor C2 through a diode D; the positive electrode of the capacitor C2 is connected with a switching power supply circuit, the switching power supply circuit outputs a direct current stabilized power supply for a weak current circuit, the positive electrode of the capacitor C2 is connected with a voltage sampling circuit, a voltage sampling signal output by the voltage sampling circuit outputs a control signal through a return difference comparison circuit, and the control signal is connected with the grid electrode of the MOS tube K through a driving circuit to control the conduction and the cut-off of the MOS tube K.
2. The novel medium-voltage alternating-current power supply circuit as claimed in claim 1, wherein a high-voltage capacitor is selected according to different medium-voltage alternating-current power supply voltage levels and power supply power requirements; the high-voltage capacitor is formed by connecting a single high-voltage capacitor or a plurality of high-voltage capacitors in series or in parallel so as to meet different power requirements and different voltage grade requirements of a power supply.
3. The novel medium-voltage alternating-current power supply circuit as claimed in claim 1, wherein when the medium-voltage alternating-current power supply is powered by three phases, the three-phase medium-voltage alternating-current power supply is divided into three paths, and the three paths are respectively connected with the high-voltage capacitor, the piezoresistor, the micro current transformer, the rectifier bridge and the current monitoring circuit; and the three-way rectifier bridge direct current output is connected in parallel and then charges a capacitor C2 through a diode D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122303117.5U CN215990293U (en) | 2021-09-23 | 2021-09-23 | Novel medium-voltage alternating-current power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122303117.5U CN215990293U (en) | 2021-09-23 | 2021-09-23 | Novel medium-voltage alternating-current power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN215990293U true CN215990293U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122303117.5U Active CN215990293U (en) | 2021-09-23 | 2021-09-23 | Novel medium-voltage alternating-current power supply circuit |
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| Country | Link |
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| CN (1) | CN215990293U (en) |
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2021
- 2021-09-23 CN CN202122303117.5U patent/CN215990293U/en active Active
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