Overload and short circuit test device for current limiter

Abstract

The utility model discloses a current limiter overload and short circuit test device which comprises an analog circuit, a test circuit and a power supply circuit. The analog circuit comprises a current limiter, a capacitor, a first switch and a second switch, two ends of the first switch are connected to two ends of the current limiter in parallel through lines, two ends of the second switch are connected to two ends of the current limiter in parallel through lines, and the capacitor is connected to a line on one side of the second switch in parallel; the test circuit comprises a test mainboard and an input and output module, the input and output module comprises a verification chip, an input circuit and an output circuit, the input circuit and the output circuit are electrically connected with the verification chip, two ends of the current limiter are connected with the test mainboard in parallel, and an enabling output end and an enabling input end of the test mainboard are connected with the output circuit in parallel; the two ends of the power supply circuit are electrically connected with the test mainboard and provide power for the test mainboard. By adopting the above arrangement, overload and short circuit of the current limiter can be tested and detected, so that the use safety of the current limiter is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of performance testing technology of electronic and electrical product components, and specifically relates to a current limiter overload and short circuit test device. Background Art

[0002] With the continuous improvement of living and technological standards, IC current limiters have gradually become popular in products such as power adapters, circuit boards, motors, etc.; current limiters are used when overload and short circuit faults occur in the circuit, and the short circuit current exceeds the IC. Under normal circumstances, the current limiter fails to exceed the overload limit, and plays a current limiting role in the circuit. However, if the current limiter is not of good quality and does not play a protective role, it will cause damage to the entire circuit and may cause more serious power safety or even fire. However, there is no device in the prior art that can test and detect overload and short circuit problems of current limiters, thereby improving the safety of current limiters. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a current limiter overload and short circuit test device, which can test and detect the overload and short circuit of the current limiter, thereby improving the safety of the current limiter.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A current limiter overload and short circuit test device, comprising a simulation circuit, a test circuit and a power supply circuit;

[0006] The analog circuit includes a current limiter, a capacitor, a first switch and a second switch, two ends of the first switch are connected in parallel to two ends of the current limiter through a line, two ends of the second switch are connected in parallel to two ends of the current limiter through a line, and the capacitor is connected in parallel to the line on one side of the second switch;

[0007] The test circuit comprises a test mainboard and an input-output module, the input-output module comprises a verification chip and an input circuit and an output circuit electrically connected to the verification chip, the two ends of the current limiter are connected in parallel with the test mainboard, and the enable output end and the enable input end of the test mainboard are connected in parallel with the output circuit;

[0008] Both ends of the power supply circuit are electrically connected to the test mainboard to provide power to the test mainboard;

[0009] The input circuit transmits a standard power value to the verification chip, and the output circuit transmits a test power value to the verification chip. The verification chip compares the test power value with the standard power value. If the power value exceeds the set value of the power range, the analog circuit is loaded or short-circuited.

[0010] Furthermore, the output circuit includes a normally open relay and a display light, the display light is connected in parallel with the normally open relay, both ends of the test mainboard are connected in parallel with the normally open relay, one end of the normally open relay is electrically connected to the DO output terminal of the verification chip, and the other end of the normally open relay is electrically connected to the power input terminal of the verification chip; the input circuit includes a contact switch, one end of the contact switch is electrically connected to the DI input terminal of the verification chip, and the other end of the contact switch is electrically connected to the ground terminal of the verification chip.

[0011] Furthermore, the test circuit also includes a voltage stabilizer, which is electrically connected between the enable output terminal of the test mainboard and the output circuit to stabilize the load enable and power generated by the analog circuit.

[0012] Furthermore, the test circuit also includes a photoelectric relay, which is electrically connected between the test main board and the output circuit to achieve signal switching based on the photoelectric effect and the electronic switch.

[0013] Furthermore, the current limiter adopts IT8513C+ load meter.

[0014] Furthermore, the voltage stabilizer adopts MT152DS voltage stabilizer.

[0015] Furthermore, the photoelectric relay adopts a PHOTO MOS photoelectric relay.

[0016] Furthermore, the verification chip adopts a wp8028adam digital input and output chip, the DO output end of the verification chip has an NPN transistor connected to the ground end, the DI input end of the verification chip has an optocoupler and a resistor connected in series, and the optocoupler is electrically connected to the power input end.

[0017] Furthermore, the power supply circuit adopts an ANS power supply, and the ANS power supply is charged through a three-phase circuit.

[0018] The utility model has the following beneficial effects:

[0019] The current limiter overload and short-circuit test device of the utility model adopts automatic control technology, and realizes automatic detection by built-in experimental steps and test logic set in accordance with standard requirements, including a cyclic test of automatic opening and closing of the load enable end, a cyclic test of opening and closing of the load at the power input end, a cyclic test of opening and closing of the load at the power output end, and a cyclic test of opening and closing of the enable end load. The DO signal of the output circuit is compared or verified with the DI signal of the input circuit, thereby realizing cyclic testing or testing to determine whether the analog circuit is overloaded or short-circuited, thereby improving the safety of the current limiter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is a circuit diagram of the current limiter overload and short circuit test device. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "inner", "middle", "left", "right" and "one" used in this specification are only used to facilitate the description and are not used to limit the scope of the present invention. The changes or adjustments in their relative relationships shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0022] like Figure 1 As shown, a current limiter overload and short circuit test device includes a simulation circuit, a test circuit and a power supply circuit.

[0023] The simulation circuit of the utility model includes a current limiter (the current limiter adopts IT8513C+ load meter, and the load can be adjusted according to the required practical scene), a capacitor (the capacitor adopts a 470UF capacitor), a first switch (the first switch is defined as K2), a second switch (the second switch is defined as K3) and two third switches (the third switch is defined as K4). The two ends of the first switch K2 are connected in parallel at the two ends of the current limiter through a line, and the two ends of the second switch K3 are connected in parallel at the two ends of the current limiter through a line. The capacitor is connected in parallel to the line on one side of the second switch, and the two third switches K4 are connected at the two ends of the current limiter to control the start and stop of the current limiter. Therefore, when simulating a short circuit, the first switch K2 is controlled to be closed and the second switch K3 is opened; when simulating an overload, the first switch K2 is controlled to be opened and the second switch K4 is closed.

[0024] The test circuit of the utility model comprises a test mainboard and an input-output module, the input-output module comprises a verification chip and an input circuit and an output circuit respectively electrically connected to a DI input terminal and a DO output terminal of the verification chip, two ends of a current limiter are connected in parallel with an input terminal (OUT+) and an output terminal (OUT-) of the test mainboard, and an enable output terminal and an enable input terminal of the test mainboard are connected in parallel with the output circuit.

[0025] In order to realize the function of cyclic test through input and output module. The verification chip of this embodiment adopts wp8028adam digital input and output chip, the DO output terminal of the verification chip has an NPN transistor connected to the ground terminal, the output circuit includes a normally open relay and a display light, the display light is connected in parallel with the normally open relay, the enable output terminal and the enable input terminal of the test mainboard are connected in parallel with the normally open relay, one end of the normally open relay is electrically connected to the DO output terminal of the verification chip, and the other end of the normally open relay is electrically connected to the power input terminal of the verification chip. The DI input terminal of the verification chip has an optocoupler and a resistor in series, and the optocoupler is electrically connected to the power input terminal; the input circuit includes a contact switch, one end of the contact switch is electrically connected to the DI input terminal of the verification chip, and the other end of the contact switch is electrically connected to the ground terminal of the verification chip.

[0026] Therefore, by setting the verification chip, input circuit and output circuit, and connecting the two ends of the test mainboard in parallel with the normally open relay, the enable signal, power signal and load condition generated by the analog circuit are connected in parallel at the two ends of the normally open relay. Therefore, according to the instructions for use of wp8028adam, the user can adjust the overload, short circuit or normal (the first switch K2 and the second switch K3 are both disconnected) working mode of the analog circuit according to the actual situation, and compare the power generated by the output circuit with the power generated by the input circuit, so as to realize the load enable end, the load at the power input end, the load at the power output end, and the enable end load. The cycle test of automatic opening and closing is realized, so as to test and verify whether the analog circuit is overloaded or short-circuited.

[0027] In order to stabilize the load enable and power generated by the analog circuit, the test circuit of this embodiment also includes a voltage stabilizer. The voltage stabilizer adopts an MT152DS voltage stabilizer. The voltage stabilizer is electrically connected between the enable output terminal and the output circuit of the test mainboard, thereby achieving the function of stabilizing the power and load enable signals.

[0028] In order to realize the function of signal switching, the test circuit of this embodiment also includes a photoelectric relay, which adopts a PHOTO MOS photoelectric relay. The photoelectric relay is electrically connected between the test main board and the output circuit to realize signal switching based on the photoelectric effect and the electronic switch, and the switched signal is connected in parallel at both ends of the normally open relay to compare or verify the DO signal of the output circuit with the DI signal of the input circuit, thereby realizing a cyclic test or test to determine whether the analog circuit is overloaded or short-circuited.

[0029] The power supply circuit of the utility model adopts an ANS power supply, which is charged through a three-phase circuit. Both ends of the power supply circuit are electrically connected to the test mainboard to provide power to the test mainboard.

[0030] Therefore, the input circuit transmits the standard power value to the verification chip (the standard power value belongs to the DI signal), and the output circuit transmits the test power value to the verification chip (the test power value belongs to the DO signal). The verification chip compares the test power value with the standard power value. If it exceeds the power range setting value, there is a load or short circuit in the analog circuit.

[0031] When the utility model is actually working, the following parameter adjustment methods can be adopted:

[0032] 1) Adjust the test voltage of the input and output module: DC0-60.00V digitally adjustable, with a setting accuracy of 0.1%+0.01V, and a display accuracy of 0.1%+0.01V. The test current setting is: 0-9.999A.

[0033] 2) Select the test station for the output circuit in the input / output module: station 1.

[0034] 3) Delay control: Enable end on / off time: 0.5-99.99 seconds adjustable; input power-on, disconnection time: 0.5-99.99 seconds adjustable; load open circuit, 0Ω time: 0.5-99.99 seconds adjustable; test times: 1-99999 times adjustable.

[0035] 4) Load selection (automatic selection): A. Adjustable constant current load: 0.1-10A adjustable, accuracy: ± (0.1% test value + 0.1% range); B. 0Ω||470uF; C. Controllable open circuit and short circuit state.

[0036] 5) Enable end interface: high level enable, low level enable optional; interface level: 3-12V manually adjustable; signal isolation: electrical isolation control output.

[0037] 6) Parameter setting and display operation: A. Computer screen control and Chinese menu operation; B. Digital setting of test voltage, current and program number, fully automatic operation.

[0038] In summary, the current limiter overload and short-circuit test device of the present invention adopts automatic control technology, and realizes automatic detection according to the built-in experimental steps and test logic set in accordance with the standard requirements, including a cyclic test of automatic opening and closing of the load enable end, a cyclic test of opening and closing of the load at the power input end, a cyclic test of opening and closing of the load at the power output end, and a cyclic test of opening and closing of the load at the enable end. The DO signal of the output circuit is compared or verified with the DI signal of the input circuit, thereby realizing a cyclic test or test to determine whether the analog circuit is overloaded or short-circuited, thereby improving the safety of the current limiter.

[0039] The implementation methods of the utility model are not limited to this. According to the above content of the utility model, by using common technical knowledge and customary means in the field, without departing from the above basic technical ideas of the utility model, the utility model can also make other various forms of modification, replacement or combination, all of which fall within the scope of protection of the utility model.

Claims

1. A current limiter overload and short circuit test device, characterized in that: Including simulation circuit, test circuit and power supply circuit; The analog circuit includes a current limiter, a capacitor, a first switch and a second switch, two ends of the first switch are connected in parallel to two ends of the current limiter through a line, two ends of the second switch are connected in parallel to two ends of the current limiter through a line, and the capacitor is connected in parallel to the line on one side of the second switch; The test circuit comprises a test mainboard and an input-output module, the input-output module comprises a verification chip and an input circuit and an output circuit electrically connected to the verification chip, the two ends of the current limiter are connected in parallel with the test mainboard, and the enable output end and the enable input end of the test mainboard are connected in parallel with the output circuit; Both ends of the power supply circuit are electrically connected to the test mainboard to provide power to the test mainboard; The input circuit transmits a standard power value to the verification chip, and the output circuit transmits a test power value to the verification chip. The verification chip compares the test power value with the standard power value. If the power value exceeds the set value of the power range, the analog circuit is loaded or short-circuited.

2. The current limiter overload and short circuit test device according to claim 1, characterized in that: The output circuit includes a normally open relay and a display light, the display light is connected in parallel with the normally open relay, both ends of the test mainboard are connected in parallel with the normally open relay, one end of the normally open relay is electrically connected to the DO output end of the verification chip, and the other end of the normally open relay is electrically connected to the power input end of the verification chip; the input circuit includes a contact switch, one end of the contact switch is electrically connected to the DI input end of the verification chip, and the other end of the contact switch is electrically connected to the ground end of the verification chip.

3. The current limiter overload and short circuit test device according to claim 1, characterized in that: The test circuit also includes a voltage stabilizer, which is electrically connected between the enable output terminal of the test mainboard and the output circuit to perform voltage stabilization processing on the load enable and power generated by the analog circuit.

4. The current limiter overload and short circuit test device according to claim 1, characterized in that: The test circuit also includes a photoelectric relay, which is electrically connected between the test main board and the output circuit to achieve signal switching based on the photoelectric effect and the electronic switch.

5. The current limiter overload and short circuit test device according to claim 1, characterized in that: The current limiter adopts IT8513C+ load meter.

6. The current limiter overload and short circuit test device according to claim 3, characterized in that: The voltage stabilizer adopts MT152DS voltage stabilizer.

7. The current limiter overload and short circuit test device according to claim 4, characterized in that: The photoelectric relay adopts PHOTO MOS photoelectric relay.

8. The current limiter overload and short circuit test device according to claim 2, characterized in that: The verification chip adopts the wp8028adam digital input and output chip. The DO output end of the verification chip has an NPN transistor connected to the ground end. The DI input end of the verification chip has an optocoupler and a resistor in series. The optocoupler is electrically connected to the power input end.

9. The current limiter overload and short circuit test device according to claim 1, characterized in that: The power supply circuit adopts an ANS power supply, and the ANS power supply is charged through a three-phase circuit.

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