CN212932773U

CN212932773U - High-precision power tester

Info

Publication number: CN212932773U
Application number: CN202021436835.9U
Authority: CN
Inventors: 李娜
Original assignee: Jiaxing Dingwang Electric Co ltd
Current assignee: Zhejiang Yunji Electrical Technology Co ltd
Priority date: 2020-07-21
Filing date: 2020-07-21
Publication date: 2021-04-09
Anticipated expiration: 2030-07-21

Abstract

The utility model discloses a high accuracy power tester for measure the power of alternating current, including casing and circuit board, the casing is equipped with alternating current contact jaw A and alternating current contact jaw B, alternating current contact jaw A with alternating current contact jaw B all with circuit board electric connection, place in the circuit board the casing, the circuit board includes power test circuit, power test circuit includes power test chip U1 and alternating current transformer CT, alternating current contact jaw A with 1 pin electric connection of alternating current transformer CT. The utility model discloses a high accuracy power tester, it can test the power of alternating current, through the power test chip, takes a sample voltage and the electric current of alternating current respectively, then reachs through calculating.

Description

High-precision power tester

Technical Field

The utility model belongs to the technical field of power test, concretely relates to high accuracy power tester.

Background

With the development of science and technology, large-scale access of various power devices, such as UPS, distributed power sources of wind power/solar energy, electric vehicles, LED lighting and other direct current devices, to an alternating current power grid becomes a normal state of a power distribution network. In the process, the electric energy change links are multiple, the efficiency is low, and adverse effects are generated on the safe operation and upgrading transformation of the power distribution network, so that the power of the alternating current can be tested before the electric appliance operates, and whether the alternating current meets the standards and stability of the electric appliance or not is judged.

The publication number is: CN111025062A, entitled SVG power module test system and method, the technical scheme discloses that the SVG power module test system comprises an upper computer, an SVG control box, a direct current power supply and an alternating current voltage tester; one end of the SVG control box is connected with the upper computer, and the other end of the SVG control box is connected with a power module control board of the SVG power module; the direct-current power supply is connected with a direct-current input end of a power module to be tested in the SVG power module, and the alternating-current voltage tester is connected with an alternating-current output end of the power module to be tested and an upper computer; the SVG control box is used for receiving a test instruction sent by the upper computer, generating a drive waveform according to the test instruction and sending the drive waveform to the power module control board; the power module control board is also used for receiving the state information of the power module to be tested, which is sent by the power module control board, generating state feedback information according to the state information of the power module to be tested and sending the state feedback information to the upper computer; and the alternating voltage tester is used for detecting the voltage data of the alternating current output end of the power module to be tested and sending the voltage data to the upper computer.

Taking the above invention patent as an example, although the power test is mentioned, the technical problem to be solved is: the defects of large test workload and long time consumption of the SVG power module in the prior art are overcome. Which is different from the present invention, and therefore, further improvement is made to the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

A primary object of the utility model is to provide a high accuracy power tester, it can test the power of alternating current, through the power test chip, takes a sample voltage and the electric current of alternating current respectively, then reachs through calculating to can show through the display screen.

Another object of the utility model is to provide a high accuracy power tester, it has advantages such as the accuracy is high, the security is high and easy operation.

In order to achieve the above object, the present invention provides a high precision power tester for measuring ac power, comprising a housing and a circuit board, wherein the housing is provided with an ac contact end a and an ac contact end B, the ac contact end a and the ac contact end B are both electrically connected to the circuit board, the circuit board is arranged in the housing, the circuit board comprises a power test circuit, the power test circuit comprises a power test chip U1 and an ac transformer CT, the ac contact end a is electrically connected to a pin 1 of the ac transformer CT, a pin 3 of the ac transformer CT is electrically connected to a pin 3 of the power test chip U1 through a resistor R7, a pin 4 of the ac transformer CT is electrically connected to a pin 4 of the power test chip U1 through a resistor R8, and a resistor R5 and a resistor R6 are connected in series between the pin 3 and the pin 4 of the ac transformer CT, a capacitor C1 and a capacitor C2 are connected between the 3 pin and the 4 pin of the power test chip U1 in series, and the common end of the resistor R5 and the resistor R6 is connected to the common end of the capacitor C1 and the capacitor C2 to the ground (the 3 pin and the 4 pin of the power test chip U1 are subjected to current sampling);

the 2 pin of the alternating current transformer CT is electrically connected with the 6 pin of the power test chip U1 through a resistor R1, one end of the resistor R1 close to the power test chip U1 is also electrically connected with the alternating current contact end B through a resistor R2 and a resistor R3, one end of the resistor R1 close to the power test chip U1 is also grounded through a capacitor C3, one path of the 7 pin of the power test chip U1 is grounded through a resistor R4, and the other path of the 7 pin of the power test chip U1 is grounded through a capacitor C4 (voltage sampling is performed on the 6 pin and the 7 pin of the power test chip U1).

As a further preferable technical solution of the above technical solution, the 2 pin of the ac transformer CT is grounded sequentially through a capacitor C5, a resistor R9, a diode VD1, a resistor R10 and a diode VD3, both ends of the diode VD1 are connected with a diode VD2 and a capacitor C6 which are connected in series, the anode of the diode VD1 is connected with the cathode of the diode VD2, and the common connection end of the diode VD2 and the capacitor C6 is grounded.

As a further preferable technical solution of the above technical solution, one path of the 1 pin of the power test chip U1 is grounded through a capacitor C7, and the other path of the 1 pin of the power test chip U1 is also grounded through a capacitor C8, and the 2 pin, the 1 pin and the 14 pin of the power test chip U1 are connected.

As a further preferable technical solution of the above technical solution, the pin 17 of the power test chip U1 is grounded through the resistor R11 and the light emitting diode LED in sequence.

As a further preferable technical solution of the above technical solution, a crystal oscillator X1 is connected in series between the 16 pin and the 15 pin of the power test chip U1, one end of the crystal oscillator X1, which is far away from the 16 pin of the power test chip U1, is grounded through a capacitor C11, and one end of the crystal oscillator X1, which is far away from the 15 pin of the power test chip U1, is grounded through a capacitor C12.

As a further preferable technical solution of the above technical solution, one path of the 8 pins of the power test chip U1 is grounded through a capacitor C9, the other path of the 8 pins of the power test chip U1 is grounded through a capacitor C10, and the 8 pins and the 9 pins of the power test chip U1 are connected.

As a further preferable technical solution of the above technical solution, the power test circuit further includes a display screen, and the display screen is electrically connected to the power test chip U1 (the display screen is used for displaying the power measured by the test).

Drawings

Fig. 1 is a power testing circuit diagram of the high-precision power tester of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

The utility model discloses a high accuracy power tester combines preferred embodiment below, further describes utility model's concrete embodiment.

Referring to fig. 1 of the drawings, fig. 1 is a power testing circuit diagram of a high-precision power tester according to the present invention.

In the embodiments of the present invention, those skilled in the art will note that the housing, circuit board, etc. of the present invention can be regarded as the prior art.

PREFERRED EMBODIMENTS

The utility model discloses a high accuracy power tester for measure the power of alternating current, including casing and circuit board, the casing is equipped with alternating current contact jaw A and alternating current contact jaw B, alternating current contact jaw A with alternating current contact jaw B all with circuit board electric connection, place in the circuit board the casing, the circuit board includes power test circuit, power test circuit includes power test chip U1 and alternating current transformer CT, alternating current contact jaw A with alternating current transformer CT's 1 pin electric connection, alternating current transformer CT's 3 pins through resistance R7 with power test chip U1's 3 pins electric connection, alternating current transformer CT's 4 pins through resistance R8 with power test chip U1's 4 pins electric connection, it has resistance R5 and resistance R6 to concatenate between alternating current transformer CT's 3 and 4 pins, a capacitor C1 and a capacitor C2 are connected between the 3 pin and the 4 pin of the power test chip U1 in series, and the common end of the resistor R5 and the resistor R6 is connected to the common end of the capacitor C1 and the capacitor C2 to the ground (the 3 pin and the 4 pin of the power test chip U1 are subjected to current sampling);

Specifically, the 2 pins of the alternating current transformer CT sequentially pass through a capacitor C5, a resistor R9, a diode VD1, a resistor R10 and a diode VD3 to be grounded, two ends of the diode VD1 are connected with a diode VD2 and a capacitor C6 which are connected in series, the anode of the diode VD1 is connected with the cathode of the diode VD2, and the common connection end of the diode VD2 and the capacitor C6 is grounded.

More specifically, one path of the 1 pin of the power test chip U1 is grounded through a capacitor C7, the other path of the 1 pin of the power test chip U1 is grounded through a capacitor C8, and the 2 pin, the 1 pin and the 14 pin of the power test chip U1 are connected.

Further, the pin 17 of the power test chip U1 is grounded through a resistor R11 and a light emitting diode LED (for displaying the connection state of the tester) in sequence.

Furthermore, a crystal oscillator X1 is connected in series between the 16 pin and the 15 pin of the power test chip U1, one end of the crystal oscillator X1, which is far away from the 16 pin of the power test chip U1, is grounded through a capacitor C11, and one end of the crystal oscillator X1, which is far away from the 15 pin of the power test chip U1, is grounded through a capacitor C12.

Preferably, one path of the 8 pins of the power test chip U1 is grounded through a capacitor C9, the other path of the 8 pins of the power test chip U1 is grounded through a capacitor C10, and the 8 pins and the 9 pins of the power test chip U1 are connected.

Preferably, the power test circuit further includes a display screen (partially embedded in the housing), and the display screen is electrically connected to the power test chip U1 (the display screen is used for displaying the power measured by the test).

Preferably, the utility model discloses focus protects the circuit structure of power test circuit, and mechanical structure all regards as prior art.

It is worth mentioning that the technical features such as the casing and the circuit board related to the patent application of the present invention should be regarded as the prior art, and the specific structure, the working principle of these technical features and the control mode and the space arrangement mode that may be related to adopt the conventional selection in the field, should not be regarded as the invention point of the present invention, and the present invention does not further specifically expand the detailed description.

It will be apparent to those skilled in the art that modifications and variations can be made in the above-described embodiments, or some features of the invention may be substituted or omitted, and any modification, substitution, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A high-precision power tester is used for measuring the power of alternating current and comprises a shell and a circuit board, wherein the shell is provided with an alternating current contact end A and an alternating current contact end B, the alternating current contact end A and the alternating current contact end B are both electrically connected with the circuit board, and the circuit board is arranged in the shell in a built-in mode, and is characterized in that the circuit board comprises a power test circuit, the power test circuit comprises a power test chip U1 and an alternating current transformer CT, the alternating current contact end A is electrically connected with a pin 1 of the alternating current transformer CT, a pin 3 of the alternating current transformer CT is electrically connected with a pin 3 of the power test chip U1 through a resistor R7, a pin 4 of the alternating current transformer CT is electrically connected with a pin 4 of the power test chip U1 through a resistor R8, and a resistor R5 and a resistor R6 are connected between the pin 3 and the pin 4 of, a capacitor C1 and a capacitor C2 are connected between the 3 pin and the 4 pin of the power test chip U1 in series, and the common end of the resistor R5 and the resistor R6 is connected to the common end of the capacitor C1 and the capacitor C2 and is connected to the ground;

the 2 pin of the alternating current transformer CT is electrically connected with the 6 pin of the power test chip U1 through a resistor R1, one end, close to the power test chip U1, of the resistor R1 is also electrically connected with the alternating current contact end B through a resistor R2 and a resistor R3, one end, close to the power test chip U1, of the resistor R1 is also grounded through a capacitor C3, one path of the 7 pin of the power test chip U1 is grounded through the resistor R4, and the other path of the 7 pin of the power test chip U1 is grounded through the capacitor C4.

2. The high-precision power tester as claimed in claim 1, wherein the 2 pin of the ac transformer CT is grounded through a capacitor C5, a resistor R9, a diode VD1, a resistor R10 and a diode VD3 in sequence, a diode VD2 and a capacitor C6 connected in series are connected to two ends of the diode VD1, an anode of the diode VD1 is connected to a cathode of the diode VD2, and a common terminal of the diode VD2 and the capacitor C6 is grounded.

3. A high precision power tester as claimed in claim 2, wherein the 1 pin of the power test chip U1 is connected to ground through a capacitor C7 on one side and the 1 pin of the power test chip U1 is also connected to ground through a capacitor C8 on the other side, and the 2 pin, the 1 pin and the 14 pin of the power test chip U1 are connected.

4. The high-precision power tester as claimed in claim 3, wherein the 17 pins of the power test chip U1 are grounded through a resistor R11 and a light emitting diode LED in sequence.

5. The high-precision power tester as claimed in claim 4, wherein a crystal oscillator X1 is connected in series between the 16 pin and the 15 pin of the power test chip U1, one end of the crystal oscillator X1, which is far away from the 16 pin of the power test chip U1, is grounded through a capacitor C11, and one end of the crystal oscillator X1, which is far away from the 15 pin of the power test chip U1, is grounded through a capacitor C12.

6. A high precision power tester as claimed in any one of claims 1-5, wherein 8 pins of the power test chip U1 are grounded through a capacitor C9 on one hand and 8 pins of the power test chip U1 are grounded through a capacitor C10 on the other hand, and 8 pins and 9 pins of the power test chip U1 are connected.

7. The high-precision power tester according to claim 5, wherein the power test circuit further comprises a display screen, and the display screen is electrically connected with the power test chip U1.