Circuit and device for testing rectifier

Abstract

The utility model relates to a circuit and a device used for testing a rectifier, the circuit comprises a power supply module, a protection module and a measurement module, the power supply module inputs 380V three-phase power through an L1 and L2 two-phase AC power supply, the 380V three-phase power is converted into 220V power through a control transformer, and a selection switch can switch a voltage mode; the protection module comprises a circuit breaker and a fuse, the circuit breaker is used for cutting off a power supply during overload or short circuit, and the fuse prevents the circuit from being damaged by overlarge current; the test module comprises a voltage and current integrated instrument, an operation button, a relay and a test interface, the voltage and current integrated instrument is used for measuring input and output voltage and current, and the operation button controls the relay; the test interface is used for connecting a rectifier to be tested. The rectifier test circuit and device provided by the utility model are simple in structure and convenient to operate, a tester only needs to set the voltage selection switch and press the test button to complete the test, and the efficiency, the precision and the safety of the rectifier test are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical test technical field, concretely relates to a circuit and device for testing rectifier. BACKGROUND

[0002] With the wide application of electrical equipment, especially the popularity of electromagnetic brake and power rectifier equipment, how to efficiently and accurately test the performance of rectifier has become a key problem in electrical engineering and testing field. The traditional rectifier test method usually relies on manual use of multimeter or other test instruments for segmented measurement, and the tester needs to measure the input voltage, current and output DC voltage and current of the rectifier one by one, and analyzes according to the measured results. However, this manual test method has many shortcomings: first, the test process is tedious and time-consuming, and the settings of the test instrument need to be adjusted frequently, which increases the complexity of operation; second, due to the high dependence on manual operation, errors or omissions are easy to occur, especially when dealing with complex circuits, which may lead to inaccurate test results; in addition, manual test cannot reflect the voltage and current changes of the rectifier in different working states in real time, and cannot timely find potential problems, which affects the efficiency of fault diagnosis and performance evaluation. Therefore, the existing rectifier test has great defects in efficiency, accuracy and reliability. SUMMARY

[0003] To solve the above problems, the utility model provides a circuit for testing rectifier, comprising: power module, protection module and measurement module, wherein:

[0004] The power module includes an AC power supply, a control transformer and a selection switch, the circuit provides three-phase power input for the test circuit through L1 and L2 two-phase AC power supply, the control transformer is used for voltage conversion, and the selection switch is used for switching voltage;

[0005] The protection module includes a circuit breaker and a fuse, the circuit breaker is used to cut off the power supply when overload or short circuit occurs, and the fuse prevents damage to the circuit caused by excessive current;

[0006] The test module includes a voltage and current integrated instrument, an operation button, a relay and a test interface, the voltage and current integrated instrument includes an input voltage and current meter and an output voltage and current meter, which are used to measure input and output voltage and current respectively, and the operation button controls the relay; the test interface is used to connect the rectifier to be tested.

[0007] On the basis of the above scheme, a resistor is further included, which is connected in parallel with the output voltage and current meter, and is used to simulate the load, limit the current and adjust the measurement range of voltage and current.

[0008] On the basis of the above scheme, the selection switch is connected with the primary side and the secondary side of the control transformer through the normally open contact and the normally closed contact respectively, and switches the 380V or 220V voltage mode; the coil of the relay is connected with the operation button in series, and the normally open contact of the relay is connected with the selection switch in series.

[0009] On the basis of the above scheme, the input voltage and current meter is connected between the relay and the to-be-tested rectifier, and the output voltage and current meter is connected at the output end of the rectifier.

[0010] The utility model also provides a device for testing rectifier, the device includes the circuit for testing rectifier provided above;

[0011] On the basis of the above scheme, the device is equipped with a plurality of test interfaces for inserting different models of rectifiers (the symbol of the rectifier should correspond to the symbol of the device), and the test interfaces are connected with the contact points of the to-be-tested rectifier.

[0012] Compared with the prior art, the utility model has the advantages that a rectifier test circuit and device with simple structure and convenient operation are provided, a tester only needs to set a voltage selection switch and press a test button to complete the test, and the rectifier test efficiency, precision and safety are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The circuit schematic diagram provided for the application;

[0014] Figure 2 The device schematic diagram provided for the application; DETAILED DESCRIPTION

[0015] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and the like terms should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication of two elements or the interaction of two elements.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0016] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like are all based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the devices or elements indicated must have a particular orientation, a particular orientation and operation, so it can not be understood as the limitation of the utility model.

[0017] The utility model makes further illustration in combination with the drawings below:

[0018] The application provides a circuit diagram for testing a rectifier, comprising a power module, a protection module and a measurement module, wherein:

[0019] The power module comprises an AC power supply, a control transformer BK-50 and a selection switch SA1, the power supply is provided with 380V AC power supply by two live wires L1 and L2, the control transformer converts 380V voltage into 220V, the working voltage of the power supply is selected through the selection switch, the power supply mode of 380V and 220V can be selected, and different working voltage conditions are provided for the test of the rectifier.

[0020] The protection module comprises a circuit breaker QF and a fuse FU, which are used for preventing overloading, short circuit and overcurrent and the like fault conditions of the circuit, and ensuring the safety of the circuit and electrical elements. When the circuit is overloaded or short-circuited, the circuit breaker automatically cuts off the power supply to protect the circuit from being damaged; the fuse is fused when the current exceeds the set threshold, more accurate overcurrent protection is provided, and the safety of the electrical elements is ensured.

[0021] The test module comprises a voltage and current integrated instrument VA, an operation button SB1, a relay KA and a test interface D1. The voltage and current integrated instrument comprises two independent instruments: an input voltage and current meter VA1 for measuring the AC voltage and current of the input end, and an output voltage and current meter VA2 for measuring the DC voltage and current of the output end; the operation button SB1 is used for starting and stopping the test process, when the button is pressed, the relay coil is electrified, the normally open contact is closed, and the circuit starts to work, when the button is released, the test is stopped, and the circuit is disconnected; the normally open contact of the relay KA is connected in series with the selection switch SA1 to control the conduction and disconnection of the circuit; and the test interface is used for connecting the rectifier to be tested.

[0022] The circuit of the application further comprises a resistor R, the resistor is a load resistor 800Ω with a power of 50W, is connected in parallel with the output voltage and current meter VA2, simulates the actual load of the rectifier, ensures the stability of the output current and voltage of the rectifier under the working load, and in addition, the resistor also plays a role in current limiting, prevents the voltage and current meter from being overloaded due to excessive current, and thus protects the voltage and current meter from being damaged.

[0023] As Figure 1As shown, the firewire L1 and L2 are connected to the fuse FU through the circuit breaker QF, and then connected to the control transformer BK-50, the normally open contact of the selection switch SA1 is connected to the primary side of the control transformer, and the normally closed contact is connected to the secondary side of the control transformer, for selecting the circuit operating voltage of 380V or 220V, the normally open contact of the relay KA is connected in series with the selection switch SA1, and the coil of the relay is connected in series with the operation button SB1, and the working state of the relay is controlled by the operation button. The input voltage and current meter VA1 is connected between the relay KA and the tested rectifier, and the output voltage and current meter VA2 is connected at the output end of the rectifier. In addition, the power supply of the voltage and current meter is connected to the secondary side of the control transformer, and the working voltage of 220V is used.

[0024] To realize the test of the rectifier, when the power supply is connected, the user selects the appropriate voltage mode (380V or 220V) through the selection switch SA1, presses the operation button SB1, the normally open contact is closed, the test circuit starts to work, and the voltage and current integrated instrument VA1, VA2 starts to measure the input and output voltage and current of the rectifier in real time; when the test is completed, the operation button is released, the relay KA is powered off, the normally open contact is disconnected, the test circuit stops, and the voltage and current integrated instrument stops measuring and clears all data, ensuring that each test is independent and accurate.

[0025] According to another embodiment, the application provides a device for testing a rectifier, as shown in Figure 2 As shown, the internal contains the above-mentioned test circuit, the user accesses the rectifier, selects the test voltage through the selection switch SA1, and presses the operation button SB1 to start the test. The device is equipped with multiple rectifier test interfaces D1, which facilitates the insertion of different models of rectifiers, and at the same time ensures good electrical contact through elastic pins to avoid inaccurate testing caused by poor contact. The elastic pins are made of elastic material to ensure that the contact points can be in close contact after being inserted into the rectifier, and to avoid measurement errors caused by poor contact. The elastic design allows the pins to adapt to different models and specifications of rectifiers, ensuring the universality and accuracy of the test.

[0026] Specifically, in the test interface D1, “~” represents alternating current, and “+ / -” represents direct current. The rectifier to be tested can be different models and different manufacturers, and can be tested corresponding to the symbol of the test interface. The device supports the selection of different operating voltages, can be widely used in the testing of different types of rectifiers, has good universality and adaptability, and has good effect on testing electromagnetic brake rectifier bridge in actual application.

[0027] The basic principle and main features of the present application are shown and described above, and for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, so the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, so all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0028] In addition, it should be understood that, although the present application is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A circuit for testing a rectifier, characterized in that, It includes a power supply module, a protection module, and a measurement module, among which: The power module includes an AC power supply, a control transformer, and a selection switch. The circuit provides a three-phase power input to the test circuit through two-phase AC power supplies L1 and L2. The control transformer is used for voltage conversion, and the selection switch is used for switching voltage. The protection module includes a circuit breaker and a fuse. The circuit breaker is used to cut off the power supply in case of overload or short circuit, and the fuse prevents excessive current from damaging the circuit. The measurement module includes an integrated voltage and current meter, an operation button, a relay, and a test interface. The integrated voltage and current meter includes an input voltage and current meter and an output voltage and current meter, which are used to measure the input and output voltage and current, respectively. The operation button controls the relay. The test interface is used to connect to the rectifier under test.

2. The circuit for testing a rectifier according to claim 1, characterized in that, It also includes a resistor connected in parallel with the output voltage and current meter to simulate load, limit current, and adjust the measurement range of voltage and current.

3. The circuit for testing a rectifier according to claim 1, characterized in that, The selector switch is connected to the primary and secondary sides of the control transformer through its normally open and normally closed contacts, respectively, to switch between 380V and 220V voltage modes; the coil of the relay is connected in series with the operation button, and the normally open contact of the relay is connected in series with the selector switch.

4. A circuit for testing a rectifier according to claim 3, characterized in that, The input voltage and current meter is connected between the relay and the rectifier under test, and the output voltage and current meter is connected to the output terminal of the rectifier.

5. An apparatus for testing rectifiers, characterized in that, The device includes the circuit for testing a rectifier as described in any one of claims 1-4.

6. The apparatus for testing a rectifier according to claim 5, characterized in that, The device is equipped with multiple test interfaces for inserting different types of rectifiers, and the test interfaces are connected to the contact points of the rectifier under test.

Images