CN216387274U - Voltage and current sampling circuit in alternating current-direct current voltage withstand test - Google Patents
Voltage and current sampling circuit in alternating current-direct current voltage withstand test Download PDFInfo
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- CN216387274U CN216387274U CN202122551040.3U CN202122551040U CN216387274U CN 216387274 U CN216387274 U CN 216387274U CN 202122551040 U CN202122551040 U CN 202122551040U CN 216387274 U CN216387274 U CN 216387274U
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Abstract
The utility model discloses a voltage and current sampling circuit in an alternating current-direct current withstand voltage test, which comprises a resistor R1, a resistor R2, a high-voltage relay K1, a diode D1, a capacitor C1 and a high-voltage transformer W, wherein one end of the high-voltage transformer W is connected with an input power supply, the other end of the high-voltage transformer W is connected with a resistor R1, the other end of the resistor R1 is connected with a resistor R2, a high-voltage relay K1 and a diode D1, and the other end of the resistor R2 is connected with an alternating current voltage sampling end.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a voltage and current sampling circuit in an alternating current-direct current withstand voltage test.
Background
In a general alternating current/direct current voltage withstand test, alternating current/direct current voltage sampling needs to be carried out through a special alternating current/direct current voltage channel, a high-voltage relay needs to be used for isolation, the price of the general high-voltage relay is very high, and the general high-voltage relay is easy to damage due to the fact that the general high-voltage relay is often used in a high-voltage environment, so that great troubles are brought to manufacturers and customers. Conventional current-voltage sampling is shown in fig. 1. It is seen from the conventional circuit that 4 separate high voltage relays are required.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a voltage and current sampling circuit in an alternating current-direct current withstand voltage test, so as to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides a voltage current sampling circuit among alternating current-direct current withstand voltage test, includes resistance R1, resistance R2, high-voltage relay K1, diode D1, electric capacity C1 and high-voltage transformer W, input power is connected to high-voltage transformer W's one end, high-voltage transformer W's other end connecting resistance R1, another single connection resistance R2, high-voltage relay K1 and diode D1 of resistance R1, alternating voltage sample end is connected to resistance R2's the other end, electric capacity C1, high-voltage relay K1's the other end and high voltage output end are connected to diode D1's the other end, electric capacity C1's the other end ground connection.
As a further technical solution of the present invention, the diode D1 is a rectifier diode.
As a further technical solution of the present invention, the capacitor C1 is a filter capacitor.
As a further technical solution of the present invention, the resistor R1 is a current limiting resistor.
As a further technical solution of the present invention, the resistor R2 is a sampling resistor.
Compared with the prior art, the utility model has the beneficial effects that: by adopting the design, the original four high-voltage relays can be reduced to 1 high-voltage relay, so that the cost of manufacturers is greatly saved in the actual use, meanwhile, the problem of about 75 percent of high-voltage relays is reduced, and the after-sale maintenance cost of customers is also greatly reduced.
Drawings
Fig. 1 is a circuit diagram of the prior art.
Fig. 2 is a circuit diagram of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 2, example 1: the utility model provides a voltage current sampling circuit among alternating current-direct current withstand voltage test, includes resistance R1, resistance R2, high-voltage relay K1, diode D1, electric capacity C1 and high-voltage transformer W, input power is connected to high-voltage transformer W's one end, high-voltage transformer W's other end connecting resistance R1, another single connection resistance R2, high-voltage relay K1 and diode D1 of resistance R1, alternating voltage sample end is connected to resistance R2's the other end, electric capacity C1, high-voltage relay K1's the other end and high voltage output end are connected to diode D1's the other end, electric capacity C1's the other end ground connection.
Fig. 2 can analyze that when the high-voltage relay is switched on during alternating current test, the point a to the high-voltage output end is in a short-circuit state, the rectifier diode and the filter capacitor below do not work, and the output is in a pure alternating current state. And the sampling resistor obtains the current high-voltage output alternating current signal. When the relay is switched off, the output of the high-voltage transformer can only pass through the rectifier diode, and then is filtered by the high-voltage capacitor, and the output is direct-current voltage. Although the voltage sampling signal is still an alternating current signal, the accurate direct current voltage signal can be calculated only by calculating the specific proportion of an alternating current signal and a direct current signal through software.
In embodiment 2, the diode D1 is a rectifier diode in addition to embodiment 1. The capacitor C1 is a filter capacitor. Resistor R1 is a current limiting resistor. Resistor R2 is a sampling resistor.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a voltage current sampling circuit among alternating current-direct current withstand voltage test, includes resistance R1, resistance R2, high-voltage relay K1, diode D1, electric capacity C1 and high-voltage transformer W, its characterized in that, input power is connected to high-voltage transformer W's one end, high-voltage transformer W's other end connecting resistance R1, another single connection resistance R2, high-voltage relay K1 and diode D1 of resistance R1, the alternating voltage sample end is connected to resistance R2's the other end, electric capacity C1, the other end and the high voltage output of high-voltage relay K1 are connected to diode D1's the other end, the other end ground connection of electric capacity C1.
2. The voltage and current sampling circuit for AC/DC withstand voltage test according to claim 1, wherein the diode D1 is a rectifier diode.
3. The voltage and current sampling circuit in AC/DC withstand voltage test of claim 1, wherein said capacitor C1 is a filter capacitor.
4. The voltage and current sampling circuit in AC/DC withstand voltage test of claim 1, wherein said resistor R1 is a current limiting resistor.
5. The voltage and current sampling circuit in the AC/DC withstand voltage test of claim 1, wherein the resistor R2 is a sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122551040.3U CN216387274U (en) | 2021-10-22 | 2021-10-22 | Voltage and current sampling circuit in alternating current-direct current voltage withstand test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122551040.3U CN216387274U (en) | 2021-10-22 | 2021-10-22 | Voltage and current sampling circuit in alternating current-direct current voltage withstand test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216387274U true CN216387274U (en) | 2022-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122551040.3U Active CN216387274U (en) | 2021-10-22 | 2021-10-22 | Voltage and current sampling circuit in alternating current-direct current voltage withstand test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216387274U (en) |
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2021
- 2021-10-22 CN CN202122551040.3U patent/CN216387274U/en active Active
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