CN211263599U - Multi-loop high-voltage indicating circuit for current transformer and current transformer - Google Patents
Multi-loop high-voltage indicating circuit for current transformer and current transformer Download PDFInfo
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- CN211263599U CN211263599U CN201921832647.5U CN201921832647U CN211263599U CN 211263599 U CN211263599 U CN 211263599U CN 201921832647 U CN201921832647 U CN 201921832647U CN 211263599 U CN211263599 U CN 211263599U
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Abstract
The utility model discloses a multiloop high voltage indicating circuit and converter for converter specifically includes a high voltage indicating unit, first diode and second diode, the one end of high voltage indicating unit be used for with the input circuit negative pole of converter links to each other, the other end of high voltage indicating unit with the negative pole of first diode links to each other, the positive pole of first diode be used for with the positive pole of input circuit links to each other; and the anode of the second diode is used for being connected with the output end of the main input switch of the converter or the output end of the charging switch, and the cathode of the second diode is connected with one end of the high-voltage indicating unit and the cathode of the first diode. The technical scheme has the advantages of simple structure, low cost, low energy consumption and the like.
Description
Technical Field
The utility model mainly relates to a multiloop high voltage indicating circuit and converter for converter is refered in particular to in track traffic technical field.
Background
When the rail transit vehicle assists the inverter base to be overhauled, the overhaul is required to be confirmed under the condition of no high voltage. In order to ensure the safety of personnel, it is necessary to intuitively display whether the device has a high voltage or not, and therefore, both the high voltage input circuit 1 and the intermediate dc circuit 2 of the subordinate inverter need to be provided with high voltage indicating units (HVD1 and HVD2), as shown in fig. 1. The high-voltage indicating unit 4 is internally provided with a high-voltage processing circuit, adopts a red LED as an indicating lamp and is used for displaying the voltage state of a direct-current bus of the converter, the indicating lamp is turned on when the voltage is more than DC36V +/-5V, and the indicating lamp is turned off when the voltage is less than DC21V +/-5V. However, the 2 high-voltage indicating units are high in cost, large in size and high in consumed energy.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in: to the technical problem that prior art exists, the utility model provides a simple structure, with low costs and consume energy few multiloop high voltage indicating circuit and converter.
In order to solve the technical problem, the utility model provides a technical scheme does:
a multi-loop high-voltage indicating circuit for a current transformer comprises a high-voltage indicating unit, a first diode and a second diode, wherein one end of the high-voltage indicating unit is used for being connected with the cathode of an input circuit of the current transformer, the other end of the high-voltage indicating unit is connected with the cathode of the first diode, and the anode of the first diode is used for being connected with the anode of the input circuit; and the anode of the second diode is used for being connected with the output end of the main input switch of the converter or the output end of the charging switch, and the cathode of the second diode is connected with one end of the high-voltage indicating unit and the cathode of the first diode.
The utility model also discloses a converter, including input circuit, middle direct current circuit, inverter circuit, main input switch, pre-charge circuit and as above be used for the multiloop high-voltage indicating circuit of converter, input circuit, middle direct current circuit and inverter circuit link to each other in proper order, main input switch establishes ties on the anodal direct current bus between input circuit and the middle direct current circuit, pre-charge circuit with main input switch connects in parallel; the pre-charging circuit comprises a charging resistor and a charging switch which are connected in series; one end of a high-voltage indicating unit of the multi-loop high-voltage indicating circuit is connected with a negative direct-current bus of the input circuit, the anode of the first diode is connected with a positive direct-current bus of the input circuit, and the anode of the second diode is connected with the output end of the main input switch or the output end of the charging switch.
As a further improvement of the above technical solution:
the middle direct current circuit comprises a middle direct current capacitor, two ends of the middle direct current capacitor are connected with a positive direct current bus and a negative direct current bus of the middle direct current circuit, and the middle direct current capacitor is connected with a fixed discharge resistor in parallel.
And a reactor is connected in series on the positive direct current bus between the intermediate direct current capacitor and the main input switch.
The main input switch and the charging switch are both contactors.
Compared with the prior art, the utility model has the advantages of:
the utility model discloses a multiloop high voltage indicating circuit and converter for converter adopts a high voltage indicating unit, links to each other with input circuit and middle direct current circuit respectively to can show the high-pressure state of input circuit and middle direct current circuit (get the high demonstration of voltage), simple structure, small, with low costs and consume energy little; and in addition, a first diode and a second diode are arranged, so that the normal operation of each circuit is ensured without being influenced by the indicating circuit.
Drawings
Fig. 1 is a schematic circuit diagram of a high voltage indicating circuit in the prior art.
Fig. 2 is a schematic circuit diagram of an indicating circuit and a converter according to an embodiment of the present invention.
The reference numbers in the figures denote: 1. an input circuit; 2. an intermediate DC circuit; 3. an inverter circuit; 4. a high voltage indicating unit.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments.
As shown in fig. 2, the multi-loop high voltage indicating circuit for the current transformer of the present embodiment includes a high voltage indicating unit 4 (HVD1 in fig. 2), a first diode VT1 and a second diode VT2, wherein one end of the high voltage indicating unit 4 is configured to be connected to a negative dc bus of the input circuit 1 of the current transformer, the other end of the high voltage indicating unit 4 is connected to a negative electrode of the first diode, and an anode of the first diode is configured to be connected to a positive dc bus of the input circuit 1; the anode of the second diode is used for being connected with the output end of the main input switch of the converter or the output end of the charging switch, and the cathode of the second diode is connected with the other end of the high-voltage indicating unit 4 and the cathode of the first diode.
The utility model discloses a multiloop high voltage indicating circuit for converter adopts a high voltage indicating unit 4 (like xi' an hua xin voltage detection display module DJ-4000A), links to each other with input circuit 1 and middle dc circuit 2 respectively to can show the high-pressure state (get the high demonstration of voltage) of input circuit 1 and middle dc circuit 2, simple structure, small, with low costs and consume energy little; and in addition, a first diode and a second diode are arranged, so that the normal operation of each circuit is ensured without being influenced by the indicating circuit.
As shown in fig. 2, the utility model also discloses a traction auxiliary converter, including input circuit 1, middle dc circuit 2, inverter circuit 3, main input switch, pre-charge circuit and as above the multiloop high-voltage indicating circuit who is used for the converter, input circuit 1, middle dc circuit 2 and inverter circuit 3 link to each other in proper order, main input switch establishes ties on the positive pole dc bus between input circuit 1 and middle dc circuit 2, pre-charge circuit and main input switch are parallelly connected; the pre-charging circuit comprises a charging resistor and a charging switch which are connected in series; one end of a high-voltage indicating unit 4 of the multi-loop high-voltage indicating circuit is connected with a negative direct-current bus of the input circuit 1, the anode of the first diode is connected with a positive direct-current bus of the input circuit 1, and the anode of the second diode is connected with the output end of the main input switch or the output end of the charging switch. The utility model discloses a pull auxiliary converter, owing to include as above multiloop high voltage indicating circuit, have equally as above multiloop high voltage indicating circuit's advantage is whole simple, easily realize moreover.
In this embodiment, the intermediate dc circuit 2 includes an intermediate dc capacitor, both ends of the intermediate dc capacitor are connected to the positive dc bus and the negative dc bus of the intermediate dc circuit 2, and the intermediate dc capacitor is connected in parallel with a fixed discharge resistor; a reactor is connected in series on a positive direct current bus between the intermediate direct current capacitor and the main input switch; the main input switch and the charging switch are both contactors.
When the input voltage is higher than a certain value, the KM2 contactor is closed for charging, and when the KM2 contactor is charged to a certain voltage, the KM1 contactor is closed and the KM2 contactor is opened. The high voltage indicating unit 4 can display the high voltage state (high voltage display) of the input circuit 1 side and the intermediate direct current circuit 2 side no matter the contactors KM1 and KM2 are closed or opened.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. A multi-loop high-voltage indicating circuit for a current transformer is characterized by comprising a high-voltage indicating unit (4), a first diode and a second diode, wherein one end of the high-voltage indicating unit (4) is used for being connected with the cathode of an input circuit (1) of the current transformer, the other end of the high-voltage indicating unit (4) is connected with the cathode of the first diode, and the anode of the first diode is used for being connected with the anode of the input circuit (1); and the anode of the second diode is used for being connected with the output end of a main input switch of the converter or the output end of a charging switch, and the cathode of the second diode is connected with one end of the high-voltage indicating unit (4) and the cathode of the first diode.
2. A converter, characterized by comprising an input circuit (1), an intermediate dc circuit (2), an inverter circuit (3), a main input switch, a pre-charge circuit and the multi-loop high voltage indicating circuit for a converter according to claim 1, wherein the input circuit (1), the intermediate dc circuit (2) and the inverter circuit (3) are connected in sequence, the main input switch is connected in series on an anode dc bus between the input circuit (1) and the intermediate dc circuit (2), and the pre-charge circuit is connected in parallel with the main input switch; the pre-charging circuit comprises a charging resistor and a charging switch which are connected in series; one end of a high-voltage indicating unit (4) of the multi-loop high-voltage indicating circuit is connected with a negative direct-current bus of the input circuit (1), the anode of the first diode is connected with an anode direct-current bus of the input circuit (1), and the anode of the second diode is connected with the output end of the main input switch or the output end of the charging switch.
3. The converter according to claim 2, characterized in that the intermediate dc circuit (2) comprises an intermediate dc capacitor, the two ends of which are connected to the positive dc bus and the negative dc bus of the intermediate dc circuit (2), and the intermediate dc capacitor is connected in parallel with a fixed discharge resistor.
4. The converter according to claim 3, wherein a reactor is connected in series to a positive DC bus between the intermediate DC capacitor and the main input switch.
5. The converter according to claim 2, 3 or 4, wherein said main input switch and charging switch are contactors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921832647.5U CN211263599U (en) | 2019-10-29 | 2019-10-29 | Multi-loop high-voltage indicating circuit for current transformer and current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921832647.5U CN211263599U (en) | 2019-10-29 | 2019-10-29 | Multi-loop high-voltage indicating circuit for current transformer and current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211263599U true CN211263599U (en) | 2020-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921832647.5U Active CN211263599U (en) | 2019-10-29 | 2019-10-29 | Multi-loop high-voltage indicating circuit for current transformer and current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211263599U (en) |
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2019
- 2019-10-29 CN CN201921832647.5U patent/CN211263599U/en active Active
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