Universal load testing device

Abstract

The utility model relates to a universal load testing device, which is characterized by comprising a rectifier bridge, an electronic load, a power switch relay, a ground switch relay, a port A, a port B and a sampling unit, one end of the power switch relay is connected with an anode of the electronic load, the other end of the power switch relay is connected with a power supply, and one end of the ground switch relay is connected with a cathode of the electronic load. The rectifier bridge comprises a first pin of a positive electrode, a second pin of a negative electrode, and a third pin and a fourth pin of an internal alternating current end, the port A is connected with the first pin, the port B is connected with the second pin, the third pin is connected with the positive electrode of the electronic load, the fourth pin is connected with the negative electrode of the electronic load, and the port A and the port B are connected with the sampling unit. By adopting the technical scheme, the universal load testing device provided by the utility model can automatically identify the type of the driving port, automatically match the corresponding load according to the type of the port, carry out automatic testing, and improve the testing efficiency.

Description

Technical Field

[0001] The utility model relates to a testing device, in particular to a universal load testing device. Background Art

[0002] During product development, driver ports often need to be connected to loads during testing.

[0003] However, the operation methods will be different for different drive port types:

[0004] High-side driver port: A resistor needs to be connected in series to the ground and the resistor needs to be replaced when the current parameters change.

[0005] Low-side driver port: A resistor needs to be connected in series to the power supply and the resistor needs to be replaced when the current parameters change.

[0006] Bridge drive port: A resistor needs to be connected in series at both ends and the resistor needs to be replaced when the current parameters change.

[0007] This results in low test efficiency and the need to frequently change resistance. Summary of the invention

[0008] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a universal load testing device, which can automatically identify the drive port type, automatically match the corresponding load according to the port type, perform automated testing, and improve test efficiency.

[0009] The technical solution of the utility model is as follows: a universal load testing device comprises a rectifier bridge, an electronic load, a power switch relay, a ground switch relay, an A port, a B port and a sampling unit, wherein one end of the power switch relay is connected to the positive electrode of the electronic load, and the other end is connected to the power supply, one end of the ground switch relay is connected to the negative electrode of the electronic load, and the other end is grounded, the rectifier bridge comprises a first pin of the positive electrode, a second pin of the negative electrode, and a third pin and a fourth pin of the internal AC end, the A port is connected to the first pin, the B port is connected to the second pin, the third pin is connected to the positive electrode of the electronic load, the fourth pin is connected to the negative electrode of the electronic load, and the A port and the B port are connected to the sampling unit.

[0010] Further configuration: the sampling unit includes a first sampling circuit, the first sampling circuit includes a resistor R138, a resistor R141, a resistor R144, a resistor R147 and a first operational amplifier, the first operational amplifier includes a positive input terminal, a negative input terminal, an output terminal, a power supply terminal and a ground terminal, the positive input terminal of the first operational amplifier is connected to the A port through the resistor R141, the negative input terminal of the first operational amplifier is connected to the output terminal of the operational amplifier, the output terminal of the first operational amplifier is connected to the resistor R144, the resistors R138 and R147 are connected in series, the resistor R144 is connected to one end of the resistor R138, and one end of the resistor R147 is grounded through the ground terminal of the first operational amplifier.

[0011] Further configuration: the sampling unit includes a second sampling circuit, the second sampling circuit includes a resistor R139, a resistor R142, a resistor R144, a resistor R148 and a second operational amplifier, the second operational amplifier includes a positive input terminal, a negative input terminal and an output terminal, the positive input terminal is connected to the B port through the resistor R142, the negative input terminal of the second operational amplifier is connected to the output terminal, the output terminal of the second operational amplifier is connected to one end of the resistor R145, the resistor R139 is connected in series with the resistor R148, the other end of the resistor R145 is connected to the resistor R139, and the other end of the resistor R148 is grounded.

[0012] Further configuration: the first sampling circuit also includes a voltage regulator diode DZ1 and a capacitor C126, the positive electrode of the voltage regulator diode DZ1 is connected to the power supply, and the negative electrode is connected to the positive input terminal of the first operational amplifier, one end of the capacitor C126 is connected to the positive input terminal of the first operational amplifier, and the other end is grounded.

[0013] Further configuration: the second sampling circuit also includes a voltage regulator diode DZ2 and a capacitor C127, the positive electrode of the voltage regulator diode DZ2 is connected to the power supply, and the negative electrode is connected to the positive input terminal of the second operational amplifier, one end of the capacitor C127 is connected to the positive input terminal of the second operational amplifier, and the other end is grounded.

[0014] Beneficial effects: the port type can be automatically identified, and the load can be automatically adapted according to the port type, and the load size can also be adjusted. At the same time, the application circuit is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the principle diagram of the test device of the utility model;

[0016] Figure 2 is a schematic diagram of a first sampling circuit;

[0017] Figure 3 is a schematic diagram of a second sampling circuit. DETAILED DESCRIPTION

[0018] The technical scheme in this embodiment will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0020] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that technical personnel in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0021] like Figure 1-3 As shown, a universal load testing device includes a rectifier bridge, an electronic load, a power switch relay, a ground switch relay, an A port, a B port and a sampling unit, wherein one end of the power switch relay is connected to the positive electrode of the electronic load, and the other end is connected to the power supply, one end of the ground switch relay is connected to the negative electrode of the electronic load, and the other end is grounded, the rectifier bridge includes a first pin of the positive electrode, a second pin of the negative electrode, and a third pin and a fourth pin of the internal AC end, the A port is connected to the first pin, the B port is connected to the second pin, the third pin is connected to the positive electrode of the electronic load, the fourth pin is connected to the negative electrode of the electronic load, and the A port and the B port are connected to the sampling unit.

[0022] Further configuration: the sampling unit includes a first sampling circuit, the first sampling circuit includes a resistor R138, a resistor R141, a resistor R144, a resistor R147 and a first operational amplifier, the first operational amplifier includes a positive input terminal, a negative input terminal, an output terminal, a power supply terminal and a ground terminal, the positive input terminal of the first operational amplifier is connected to the A port through the resistor R141, the negative input terminal of the first operational amplifier is connected to the output terminal of the operational amplifier, the output terminal of the first operational amplifier is connected to the resistor R144, the resistors R138 and R147 are connected in series, the resistor R144 is connected to one end of the resistor R138, and one end of the resistor R147 is grounded through the ground terminal of the first operational amplifier. The first sampling circuit also includes a voltage regulator diode DZ1 and a capacitor C126, the positive electrode of the voltage regulator diode DZ1 is connected to the power supply, the negative electrode is connected to the positive input terminal of the first operational amplifier, one end of the capacitor C126 is connected to the positive input terminal of the first operational amplifier, and the other end is grounded.

[0023] Further configuration: the sampling unit includes a second sampling circuit, the second sampling circuit includes a resistor R139, a resistor R142, a resistor R144, a resistor R148 and a second operational amplifier, the second operational amplifier includes a positive input terminal, a negative input terminal and an output terminal, the positive input terminal is connected to the B port through the resistor R142, the negative input terminal of the second operational amplifier is connected to the output terminal, the output terminal of the second operational amplifier is connected to one end of the resistor R145, the resistor R139 is connected in series with the resistor R148, the other end of the resistor R145 is connected to the resistor R139, and the other end of the resistor R148 is grounded. The second sampling circuit also includes a voltage zener diode DZ2 and a capacitor C127, the positive electrode of the voltage zener diode DZ2 is connected to the power supply, the negative electrode is connected to the positive input terminal of the second operational amplifier, one end of the capacitor C127 is connected to the positive input terminal of the second operational amplifier, and the other end is grounded.

[0024] The two sampling circuits are mounted on the A and B ports respectively. The status of the power switch relay and the ground switch relay are shown in Table 1:

[0025] Table 1

[0026] If the drive port type is identified as high-side, the MCU controls the ground switch relay to close and the power switch relay to disconnect.

[0027] If the driving port type is identified as low side, the MCU controls the ground switch relay to be disconnected and the power switch relay to be closed.

[0028] If the drive port type is identified as a bridge type or the wiring is wrong or there is no drive, the MCU controls the power switch and the ground switch relay to be disconnected.

[0029] Beneficial effects: The port type can be automatically identified, and the load can be automatically adapted according to the port type. The load size can also be adjusted, thereby improving the test efficiency. This solves the problem in the prior art that when the current parameters are changed, the resistance needs to be replaced, resulting in low test efficiency. At the same time, the application circuit is simple and the cost is low.

Claims

1. A universal load testing device, characterized in that: The invention comprises a rectifier bridge, an electronic load, a power switch relay, a ground switch relay, an A port, a B port and a sampling unit. One end of the power switch relay is connected to the positive electrode of the electronic load, and the other end is connected to the power supply. One end of the ground switch relay is connected to the negative electrode of the electronic load, and the other end is grounded. The rectifier bridge comprises a first pin of the positive electrode, a second pin of the negative electrode, and a third pin and a fourth pin of the internal AC end. The A port is connected to the first pin, the B port is connected to the second pin, the third pin is connected to the positive electrode of the electronic load, and the fourth pin is connected to the negative electrode of the electronic load. The A port and the B port are connected to the sampling unit.

2. The universal load testing device according to claim 1, characterized in that: The sampling unit includes a first sampling circuit, which includes a resistor R138, a resistor R141, a resistor R144, a resistor R147 and a first operational amplifier. The first operational amplifier includes a positive input terminal, a negative input terminal, an output terminal, a power supply terminal and a ground terminal. The positive input terminal of the first operational amplifier is connected to the A port through the resistor R141, the negative input terminal of the first operational amplifier is connected to the output terminal of the operational amplifier, the output terminal of the first operational amplifier is connected to the resistor R144, the resistors R138 and R147 are connected in series, the resistor R144 is connected to one end of the resistor R138, and one end of the resistor R147 is grounded through the ground terminal of the first operational amplifier.

3. The universal load testing device according to claim 1 or 2, characterized in that: The sampling unit includes a second sampling circuit, which includes a resistor R139, a resistor R142, a resistor R144, a resistor R148 and a second operational amplifier. The second operational amplifier includes a positive input terminal, a negative input terminal and an output terminal. The positive input terminal is connected to the B port through the resistor R142, the negative input terminal of the second operational amplifier is connected to the output terminal, the output terminal of the second operational amplifier is connected to one end of the resistor R145, the resistor R139 and the resistor R148 are connected in series, the other end of the resistor R145 is connected to the resistor R139, and the other end of the resistor R148 is grounded.

4. The universal load testing device according to claim 2, characterized in that: The first sampling circuit also includes a voltage stabilizing diode DZ1 and a capacitor C126. The positive electrode of the voltage stabilizing diode DZ1 is connected to the power supply, and the negative electrode is connected to the positive input terminal of the first operational amplifier. One end of the capacitor C126 is connected to the positive input terminal of the first operational amplifier, and the other end is grounded.

5. The universal load testing device according to claim 3, characterized in that: The second sampling circuit also includes a voltage stabilizing diode DZ2 and a capacitor C127. The positive electrode of the voltage stabilizing diode DZ2 is connected to the power supply, and the negative electrode is connected to the positive input terminal of the second operational amplifier. One end of the capacitor C127 is connected to the positive input terminal of the second operational amplifier, and the other end is grounded.

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