Current sampling circuit of arc resistance tester

Abstract

The utility model discloses a current sampling circuit of an arc resistance tester, which comprises a voltage regulating system, a current sampling system and a sample holder, a positive electrode and a negative electrode of the sample holder are connected through a sample, the voltage regulating system comprises a high-voltage transformer, and an output end of the high-voltage transformer is connected with the positive electrode of the sample holder. The current sampling system comprises a sampling transformer, a bridge rectifier circuit and an output connector, the input end of the sampling transformer is connected with the negative electrode of the sample holder, and the output end of the sampling transformer is connected with the output connector through the bridge rectifier circuit. When the current flowing through the sample changes, the voltage of the output connector J1 also changes synchronously, and the magnitude of the current in the experiment process can be displayed in real time by measuring the voltage of the output connector J1.

Description

Technical Field

[0001] The utility model relates to the technical field of arc resistance testers, in particular to a current sampling circuit of an arc resistance tester. Background Art

[0002] The existing arc resistance tester will not display the actual current, but will display the set current. The current changes during the experiment, and this change will not be displayed during the experiment using the existing arc resistance tester. Utility Model Content

[0003] The utility model aims to provide a current sampling circuit for an arc resistance tester to solve the problem that the existing arc resistance tester mentioned in the above background technology does not display the actual current but displays the set current and cannot display the real-time change of the current.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a current sampling circuit of an arc resistance tester, including a voltage regulating system and a current sampling system, a sample rack is arranged between the voltage regulating system and the current sampling system, the positive and negative poles of the sample rack are connected by a sample, the voltage regulating system provides voltage to the sample rack, and the current sampling system collects the current flowing through the sample.

[0005] The voltage regulation system includes a high-voltage transformer, and the output end of the high-voltage transformer is connected to the positive pole of the sample rack. The current sampling system includes a sampling transformer, a bridge rectifier circuit and an output connector. The input end of the sampling transformer is connected to the negative pole of the sample rack, and the output end of the sampling transformer is connected to the output connector through a bridge rectifier circuit. The high-voltage transformer outputs high voltage to the positive pole of the sample rack. When current is generated between the positive and negative poles of the sample rack, the current will cause the secondary coil of the sampling transformer to generate voltage. The voltage generated by the secondary coil of the sampling transformer passes through a bridge rectifier circuit composed of rectifier diodes to convert alternating current into direct current. Finally, the processed signal is output to the required location through the output connector.

[0006] The voltage regulation system also includes a regulating voltage regulator and a current limiting resistor. The input end of the regulating voltage regulator is connected to the live wire and the neutral wire respectively, and the output end of the regulating voltage regulator is connected to the input end of the high-voltage transformer through the current limiting resistor. The live wire and the neutral wire input 220V AC power to the regulating voltage regulator. The regulating voltage regulator can set the output voltage, and the output voltage of the regulating voltage regulator supplies power to the high-voltage transformer through the current limiting resistor.

[0007] The output end of the high-voltage transformer is connected to the positive electrode of the sample rack and GND respectively, and the high-voltage transformer outputs high voltage to the positive electrode of the sample rack and GND.

[0008] A filter capacitor is provided between the bridge rectifier circuit and the output connector. The direct current output by the bridge rectifier circuit is filtered by the filter capacitor to make the voltage more stable.

[0009] The bridge rectifier circuit includes four rectifier diodes, namely D1, D2, D3 and D4. One end of the secondary coil of the sampling transformer is connected to the anode of the rectifier diode D1 and the cathode of the rectifier diode D3; the other end of the secondary coil of the sampling transformer is connected to the anode of the rectifier diode D2 and the cathode of the rectifier diode D4; the cathode of the rectifier diode D1 and the cathode of the rectifier diode D2, and the voltage generated by the secondary coil of the sampling transformer is converted from AC to DC through the bridge rectifier circuit composed of rectifier diodes D1, D2, D3 and D4.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model adopts a current sampling system to be associated with the current flowing through the sample. When the current flowing through the sample changes, the voltage of the output connector J1 will also change synchronously. By measuring the voltage of the output connector J1, the current size during the experiment can be displayed in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the connection principle of the circuit elements of the utility model. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] like Figure 1 As shown, in the utility model, the voltage regulating system includes a regulating voltage regulator T1, a current limiting resistor R, and a high-voltage transformer T2; the current sampling system includes a sampling transformer T3, rectifier diodes D1, D2, D3, D4, a filter capacitor C1, and an output connector J1. The sample rack is arranged between the voltage regulating system and the current sampling system, and the positive and negative poles of the sample rack are connected by the sample. The voltage regulating system provides voltage for the sample rack, and the current sampling system collects the current flowing through the sample.

[0015] Schematic diagram component connection description: one end of the primary coil of the regulating voltage regulator T1 is connected to the live wire L and the other end is connected to the neutral wire N; one end of the secondary coil is connected to the current limiting resistor R, and the other end is connected to the primary coil of the high-voltage transformer T2; the other end of the current limiting resistor R is connected to the other end of the primary coil of the high-voltage transformer T2; one end of the secondary coil of the high-voltage transformer T2 is connected to the positive pole of the sample rack, and the other end of the secondary coil is grounded GND; one end of the primary coil of the sampling transformer T3 is connected to the negative pole of the sample rack, and the other end of the primary coil is grounded GND; one end of the secondary coil of the sampling transformer T3 is connected to the anode of the rectifier diode D1 and the cathode of the rectifier diode D3; the other end of the secondary coil of the sampling transformer T3 is connected to the anode of the rectifier diode D2 and the cathode of the rectifier diode D4; the cathode of the rectifier diode D1, the cathode of the rectifier diode D2, the positive pole of the filter capacitor C1 and the pin 1 of the output connector J1 are connected together; the anode of the rectifier diode D3, the anode of the rectifier diode D4, the negative pole of the filter capacitor C1 and the pin 2 of the output connector J1 are connected together.

[0016] The working process of the current sampling circuit of the arc resistance tester is as follows:

[0017] The live wire L and the neutral wire N input 220V AC to the regulating voltage regulator T1. The regulating voltage regulator T1 can set the output voltage. The output voltage of the regulating voltage regulator T1 is supplied to the high-voltage transformer T2 through the current limiting resistor R. The high-voltage transformer T2 outputs high voltage to the positive and GND of the sample rack; the positive and negative poles of the sample rack are connected by the sample, and the negative pole of the sample rack is connected to the primary coil of the sampling transformer T3. The other end of the primary coil of the sampling transformer T3 is grounded. When current is generated between the positive and negative poles of the sample rack, the current will flow to GND through the sampling transformer T3; the current flowing through the primary coil of the sampling transformer T3 causes the secondary coil of the sampling transformer T3 to generate voltage; the voltage generated by the secondary coil of the sampling transformer T3 is converted into DC through the bridge rectifier circuit composed of rectifier diodes D1, D2, D3, and D4; the DC output by the bridge rectifier circuit is filtered by the filter capacitor C1 to make the voltage more stable, and finally the processed signal is output to the required place through the output connector J1.

[0018] When the current flowing through the sample changes, the voltage of the output connector J1 will also change synchronously. By measuring the voltage of the output connector J1, the actual magnitude of the current can be known.

Claims

1. A current sampling circuit for an arc resistance tester, characterized in that: It includes a voltage regulating system and a current sampling system, wherein a sample rack is arranged between the voltage regulating system and the current sampling system, and the positive electrode and the negative electrode of the sample rack are connected by a sample; The voltage regulation system includes a high-voltage transformer (T2), the output end of the high-voltage transformer (T2) is connected to the positive pole of the sample rack, the current sampling system includes a sampling transformer (T3), a bridge rectifier circuit and an output connector (J1), the input end of the sampling transformer (T3) is connected to the negative pole of the sample rack, and the output end of the sampling transformer (T3) is connected to the output connector (J1) through the bridge rectifier circuit; The voltage regulating system also includes a regulating voltage regulator (T1) and a current limiting resistor (R), wherein the input end of the regulating voltage regulator (T1) is respectively connected to a live wire (L) and a neutral wire (N), and the output end of the regulating voltage regulator (T1) is connected to the input end of a high-voltage transformer (T2) through the current limiting resistor (R).

2. The current sampling circuit of the arc resistance tester according to claim 1 is characterized in that: A filter capacitor is provided between the bridge rectifier circuit and the output connector (J1).

3. The current sampling circuit of the arc resistance tester according to claim 2 is characterized in that: The bridge rectifier circuit includes four rectifier diodes.

Images