Converter detection circuit

Abstract

The utility model discloses a converter detection circuit, and relates to the technical field of converter detection. According to the main technical scheme, the device comprises a switch module, a detection module, a load module and an adjusting module, wherein the input end of the switch module is used for connecting a working power supply and a converter; the first input end of the detection module is connected with the output end of the switch module; the second input end of the detection module is used for being connected with a converter. The input end of the load module is connected with the output end of the detection module and the output end of the switch module; the output end of the load module is used for being connected with a converter. The output end of the adjusting module is used for being connected with a converter. The purposes of starting test, heating test, rated data test, no-load current test, automatic disconnection device test and the like of the converter are expected to be achieved.

Description

Technical Field

[0001] This utility model relates to the field of converter testing technology, and specifically to a converter testing circuit. Background Technology

[0002] With the continuous development of the wind power industry, the voltage level of converters is constantly increasing. The traditional two-level and three-level voltage level topologies are no longer suitable for the current development of converters. As a result, cascaded converters have emerged. This topology can improve the voltage level, and under the same power, the equipment current is small, the size is small, and the cost is low.

[0003] Single-phase cascaded converters raise the voltage phase by phase through the series connection of cascaded power modules, enabling the converter to operate normally. Therefore, how to achieve functional testing of single-phase cascaded converters is a technical problem that urgently needs to be solved. Utility Model Content

[0004] The purpose of this invention is to provide a converter detection circuit, which aims to achieve the functional detection of a single-phase cascaded converter.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A converter detection circuit includes a switching module, a detection module, a load module, and a regulating module. The input terminal of the switching module is used to connect to the operating power supply and the converter. The first input terminal of the detection module is connected to the output terminal of the switching module. The second input terminal of the detection module is used to connect to the converter. The input terminal of the load module is connected to both the output terminal of the detection module and the output terminal of the switching module. The output terminal of the load module is used to connect to the converter. The output terminal of the regulating module is used to connect to the converter.

[0007] A further technical solution is: the switching module includes a working power switch; one end of the working power switch is used to connect to the L terminal of the working power supply; the other end of the working power switch is connected to the first input terminal of the detection module.

[0008] A further technical solution is as follows: the detection module includes a first connector J2, a current transformer, an AC voltage and current dual-display meter, and a digital frequency meter; the first connector J2 is used to connect to the converter; the first end of the current transformer is connected to pins 2 and 4 of the first connector; the second end of the current transformer is connected to the input end of the load module, pin 4 of the AC voltage and current dual-display meter, and pin 7 of the digital frequency meter; the third end of the current transformer is connected to pin 1 of the AC voltage and current dual-display meter; the fourth end of the current transformer is connected to pin 3 of the AC voltage and current dual-display meter; pin 5 of the AC voltage and current dual-display meter, pin 8 of the digital frequency meter, pin 6 of the first connector J2, and the output end of the load module are all connected to pin 8 of the first connector; pin 7 of the AC voltage and current dual-display meter and pin 1 of the digital frequency meter are both connected to the other end of the power switch; pin 8 of the AC voltage and current dual-display meter and pin 2 of the digital frequency meter are both used to connect to the N pole of the power supply.

[0009] A further technical solution is that the switch module also includes a start switch; pin 1 of the start switch is connected to pin 5 of the first connector J2; and pin 2 of the start switch is connected to the input terminal of the load module.

[0010] A further technical solution is as follows: the switch module further includes a load switch and an overload switch; one end of the load switch and one end of the overload switch are both connected to pin 2 of the start switch; the other end of the load switch is connected to the input terminal of the load module; and the other end of the overload switch is connected to the output terminal of the load module.

[0011] A further technical solution is as follows: the load module includes a first contactor T3, inductors L1 and L2, resistors R1-1, R1-2, R2-1, R2-2, R3, and R4; one end of the coil of the first contactor T3 is connected to the other end of the load switch; the other end of the coil of the first contactor T3 is grounded; the moving contact of the first contactor T3 is connected to the second end of the current transformer; the stationary contact of the first contactor T3 is connected to one end of inductor L1 and one end of resistor R3; the other end of inductor L1 is connected to one end of resistors R1-1 and R2-1; the other ends of resistors R1-1, R2-1, and R1-2 are all connected to one end of resistor R2-2; the other ends of resistors R1-2 and R2-2 are all connected to one end of inductor L2; the other ends of inductor L2 and resistor R3 are both connected to pin 8 of the first connector.

[0012] A further technical solution is as follows: the load module further includes a second contactor T2; one end of the coil of the second contactor T2 is connected to the other end of the overload switch; the other end of the coil of the second contactor T2 is grounded; the moving contact of the second contactor T2 is connected to one end of the resistor R2-2; and the stationary contact of the first contactor T3 is connected to pin 8 of the first connector.

[0013] A further technical solution is as follows: the adjustment module includes a voltage regulator connector, a filter connector, a second connector J9, and a centrifugal control potentiometer; the voltage regulator connector is used to connect to a spring-loaded voltage regulator; the filter connector is used to connect to a filter; the second connector J9 is used to connect to a converter; pin 1 of the voltage regulator connector is connected to pin 5 of the second connector J9; pins 2 of both the voltage regulator connector and the second connector J9 are grounded; pin 3 of the voltage regulator connector is connected to one end of the centrifugal control potentiometer; the other end of the centrifugal control potentiometer is connected to pin 1 of the second connector J9; pins 4 of the voltage regulator connector and pin 7 of the filter connector are both connected to pin 3 of the second connector J9; pin 5 of the voltage regulator connector is connected to pin 6 of the filter connector; and pin 8 of the filter connector is connected to pin 4 of the second connector J9.

[0014] A further technical solution is: the converter detection circuit also includes a display module; the display module includes a first indicator LED1 and a second indicator LED2; the positive terminal of the first indicator LED1 is connected to pin 3 of the first connector J2, and the negative terminal of the first indicator LED1 is grounded;

[0015] The positive terminal of the second indicator LED2 is connected to pin 9 of the first connector J2, and the negative terminal of the second indicator LED2 is grounded.

[0016] A further technical solution is that the converter detection circuit also includes a voltage regulating potentiometer; one end of the voltage regulating potentiometer is connected to pin 7 of the first connector, and the other end of the voltage regulating potentiometer is grounded.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The aim is to achieve the following: converter start-up test, heating test, rated data test, no-load current test, automatic disconnection device test, etc. Attached Figure Description

[0019] Figure 1 This is a structural topology diagram of a converter detection circuit in this embodiment. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Example

[0022] This embodiment provides a converter detection circuit, including a switching module, a detection module, a load module, and a regulating module. The input terminal of the switching module is used to connect to the operating power supply and the converter; the first input terminal of the detection module is connected to the output terminal of the switching module; the second input terminal of the detection module is used to connect to the converter; the input terminal of the load module is connected to both the output terminal of the detection module and the output terminal of the switching module; the output terminal of the load module is used to connect to the converter; and the output terminal of the regulating module is used to connect to the converter.

[0023] In this embodiment, the switching module includes a power switch; one end of the power switch is connected to the L terminal of the power supply; the other end of the power switch is connected to the first input terminal of the detection module.

[0024] In this embodiment, as Figure 1 As shown, the detection module includes a first connector J2, a current transformer, an AC voltage and current dual-display meter, and a digital frequency meter. The first connector J2 is used to connect to the converter. The first end of the current transformer is connected to pins 2 and 4 of the first connector. The second end of the current transformer is connected to the input terminal of the load module, pin 4 of the AC voltage and current dual-display meter, and pin 7 of the digital frequency meter. The third end of the current transformer is connected to pin 1 of the AC voltage and current dual-display meter. The fourth end of the current transformer is connected to pin 3 of the AC voltage and current dual-display meter. Pin 5 of the AC voltage and current dual-display meter, pin 8 of the digital frequency meter, pin 6 of the first connector J2, and the output terminal of the load module are all connected to pin 8 of the first connector. Pin 7 of the AC voltage and current dual-display meter and pin 1 of the digital frequency meter are both connected to the other end of the power switch. Pin 8 of the AC voltage and current dual-display meter and pin 2 of the digital frequency meter are both used to connect to the N pole of the power supply.

[0025] In this embodiment, as Figure 1 As shown, the switch module also includes a start switch; pin 1 of the start switch is connected to pin 5 of the first connector J2; pin 2 of the start switch is connected to the input terminal of the load module.

[0026] In this embodiment, as Figure 1 As shown, the switch module further includes a load switch and an overload switch; one end of the load switch and one end of the overload switch are both connected to pin 2 of the start switch; the other end of the load switch is connected to the input terminal of the load module; and the other end of the overload switch is connected to the output terminal of the load module.

[0027] In this embodiment, as Figure 1 As shown, the load module includes a first contactor T3, inductors L1 and L2, resistors R1-1, R1-2, R2-1, R2-2, R3, and R4. One end of the coil of the first contactor T3 is connected to the other end of the load switch. The other end of the coil of the first contactor T3 is grounded. The moving contact of the first contactor T3 is connected to the second end of the current transformer. The stationary contact of the first contactor T3 is connected to one end of inductor L1 and one end of resistor R3. The other end of inductor L1 is connected to one end of resistors R1-1 and R2-1. The other ends of resistors R1-1, R2-1, and R1-2 are all connected to one end of resistor R2-2. The other ends of resistors R1-2 and R2-2 are all connected to one end of inductor L2. The other ends of inductor L2 and resistor R3 are both connected to pin 8 of the first connector.

[0028] In this embodiment, as Figure 1 As shown, the load module further includes a second contactor T2; one end of the coil of the second contactor T2 is connected to the other end of the overload switch; the other end of the coil of the second contactor T2 is grounded; the moving contact of the second contactor T2 is connected to one end of the resistor R2-2; and the stationary contact of the first contactor T3 is connected to pin 8 of the first connector.

[0029] In this embodiment, as Figure 1 As shown, the adjustment module includes a voltage regulator connector, a filter connector, a second connector J9, and a centrifugal control potentiometer. The voltage regulator connector is used to connect to a spring-loaded voltage regulator. The filter connector is used to connect to a filter. The second connector J9 is used to connect to a converter. Pin 1 of the voltage regulator connector is connected to pin 5 of the second connector J9. Pins 2 of both the voltage regulator connector and the second connector J9 are grounded. Pin 3 of the voltage regulator connector is connected to one end of the centrifugal control potentiometer. The other end of the centrifugal control potentiometer is connected to pin 1 of the second connector J9. Pins 4 of the voltage regulator connector and pin 7 of the filter connector are both connected to pin 3 of the second connector J9. Pin 5 of the voltage regulator connector is connected to pin 6 of the filter connector. Pin 8 of the filter connector is connected to pin 4 of the second connector J9.

[0030] In this embodiment, as Figure 1 As shown, the converter detection circuit also includes a display module; the display module includes a first indicator LED1 and a second indicator LED2; the positive terminal of the first indicator LED1 is connected to pin 3 of the first connector J2, and the negative terminal of the first indicator LED1 is grounded;

[0031] The positive terminal of the second indicator LED2 is connected to pin 9 of the first connector J2, and the negative terminal of the second indicator LED2 is grounded.

[0032] In this embodiment, as Figure 1 As shown, the converter detection circuit also includes a voltage regulating potentiometer; one end of the voltage regulating potentiometer is connected to pin 7 of the first connector, and the other end of the voltage regulating potentiometer is grounded.

[0033] In one optional implementation, the load switch includes load-1 and load-2, which synchronously open / close. One end of load-1 is connected to pin 2 of the start switch, and the other end is connected to one end of the coil of the first contactor T3. One end of load-2 is connected to the other end of the power supply switch. The converter detection circuit also includes a forced-draft fan, one end of which is connected to the other end of load-2, and the other end of the forced-draft fan is used to connect to the N pole of the power supply.

[0034] The working principle of a converter detection circuit in this embodiment is as follows:

[0035] Connect the voltage regulator connector to the spring-loaded voltage regulator (TY-8 type), the filter connector to the filter (LBQ-12), the first connector J2 to the converter (DBL-4500), the second connector J9 to the converter (DBL-4500), and the converter (DBL-4500) to the DC regulated power supply using cables respectively;

[0036] Adjust the voltage regulator potentiometer so that the resistance between pin 7 of the first connector J2 and pin 2 of the second connector J9 is 200Ω±10%.

[0037] The power supply for the DC regulated power supply is 27VDC;

[0038] When the power switch is closed, the AC voltage and current dual display meter and the digital display frequency meter are connected to the 220VAC power supply and are in working condition.

[0039] When the start switch is closed, the converter (DBL-4500) starts, the first indicator LED1 lights up, and the AC voltage and current dual display shows 115V±3%, while the digital frequency display shows 388-420Hz. The above operations aim to achieve the purpose of testing the converter's start-up.

[0040] Based on the above operations, further:

[0041] When the load switch is closed, load-1 and load-2 close simultaneously. At this time, the forced exhaust fan starts running and the load module is connected.

[0042] Close the overload switch to connect the rated full load or 10% overload load;

[0043] Under an ambient temperature of 20±10℃ and a rated voltage (27V) of the DC regulated power supply, a heating test was conducted according to the parameters shown in Table 1, as shown below:

[0044]

[0045]

[0046] Table 1

[0047] The experimental results were as follows: the DC regulated power supply voltage was 27VDC, the current consumption was no more than 280A, the output voltage was 115V±3%, the frequency was 388-420Hz, the output current under full load was 39.1A, the output current under 10% overload was 43A, and the efficiency of the DC regulated power supply was no less than 52%, where efficiency = output power / input power × 100%. The above operations were intended to achieve the purpose of testing the converter's heating and rated data.

[0048] Building upon the above operations, we can go a step further:

[0049] After the heating test, under thermal conditions and at the rated voltage of the DC regulated power supply, the no-load current of the converter is checked to be no greater than 75A. This is to achieve the purpose of testing the no-load current of the converter.

[0050] Building upon the above steps, the following further steps can be taken:

[0051] Use a screwdriver to remove the DC end cover and attach the reflective strip to the rotor;

[0052] Run the converter under no-load conditions at its rated voltage (27VDC regulated power supply). Slowly adjust the centrifugal control potentiometer while simultaneously using a non-contact tachometer aligned with the reflector strip to measure the converter's speed. When the second indicator LED2 illuminates, record the tachometer reading; it should be within the range of 9600±500 R / min. This aims to test the converter's automatic disconnection device.

[0053] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A converter detection circuit, characterized by, It includes: Switch module, the input end of the switch module is used to connect the working power supply and the converter; Detection module, the first input end of the detection module is connected with the output end of the switch module; the second input end of the detection module is used to connect the converter; Load module, the input end of the load module is connected with the output end of the detection module and the output end of the switch module; the output end of the load module is used to connect the converter; Adjustment module, the output end of the adjustment module is used to connect the converter.

2. The converter detection circuit according to claim 1, wherein: The switch module includes a working power supply switch; One end of the working power supply switch is used to connect the L pole of the working power supply; The other end of the working power supply switch is connected with the first input end of the detection module.

3. The converter detection circuit according to claim 2, wherein: The detection module includes a first connector J2, a mutual inductor, an AC voltage and current double display meter, and a digital frequency meter; The first connector J2 is used to connect the converter; The first end of the mutual inductor is connected with the 2nd and 4th pins of the first connector; The second end of the mutual inductor is connected with the input end of the load module, the 4th pin of the AC voltage and current double display meter, and the 7th pin of the digital frequency meter; The third end of the mutual inductor is connected with the 1st pin of the AC voltage and current double display meter; The fourth end of the mutual inductor is connected with the 3rd pin of the AC voltage and current double display meter; The 5th pin of the AC voltage and current double display meter, the 8th pin of the digital frequency meter, the 6th pin of the first connector J2, and the output end of the load module are all connected with the 8th pin of the first connector; The 7th pin of the AC voltage and current double display meter and the 1st pin of the digital frequency meter are both connected with the other end of the working power supply switch; The 8th pin of the AC voltage and current double display meter and the 2nd pin of the digital frequency meter are both used to connect the N pole of the working power supply.

4. The converter detection circuit according to claim 3, wherein: The switch module further includes a start switch; The 1st pin of the start switch is connected with the 5th pin of the first connector J2; The 2nd pin of the start switch is connected with the input end of the load module.

5. The converter detection circuit according to claim 4, wherein: The switch module further includes a load switch and an overload switch; One end of the load switch and one end of the overload switch are both connected with the 2nd pin of the start switch; The other end of the load switch is connected with the input end of the load module; The other end of the overload switch is connected with the output end of the load module.

6. The converter detection circuit according to claim 5, wherein: The load module includes a first contactor T3, an inductor L1, an inductor L2, a resistor R1-1, a resistor R1-2, a resistor R2-1, a resistor R2-2, a resistor R3, and a resistor R4; One end of the coil of the first contactor T3 is connected with the other end of the load switch; The other end of the coil of the first contactor T3 is grounded; The moving contact of the first contactor T3 is connected with the second end of the mutual inductor; The static contact of the first contactor T3 is connected with one end of the inductor L1 and one end of the resistor R3; The other end of the inductor L1 is connected with one end of the resistor R1-1 and one end of the resistor R2-1; The other end of the resistor R1-1, the other end of the resistor R2-1 and one end of the resistor R1-2 are connected with one end of the resistor R2-2; The other end of the resistor R1-2 and the other end of the resistor R2-2 are connected with one end of the inductor L2; The other end of the inductor L2 and the other end of the resistor R3 are connected with the No.8 pin of the first joint.

7. The detection circuit of the current transformer according to claim 6, characterized in that: The load module further comprises a second contactor T2; One end of the coil of the second contactor T2 is connected with the other end of the overload switch; The other end of the coil of the second contactor T2 is grounded; The moving contact of the second contactor T2 is connected with one end of the resistor R2-2; The static contact of the first contactor T3 is connected with the No.8 pin of the first joint.

8. The detection circuit of the current transformer according to any one of claims 3-7, characterized in that: The regulating module comprises a voltage regulator joint, a filter joint, a second joint J9 and a centrifugal control potentiometer; The voltage regulator joint is used for connecting a spring piece voltage regulator; The filter joint is used for connecting a filter; The second joint J9 is used for connecting a current transformer; The No.1 pin of the voltage regulator joint is connected with the No.5 pin of the second joint J9; The No.2 pin of the voltage regulator joint and the No.2 pin of the second joint J9 are both grounded; The No.3 pin of the voltage regulator joint is connected with one end of the centrifugal control potentiometer; The other end of the centrifugal control potentiometer is connected with the No.1 pin of the second joint J9; The No.4 pin of the voltage regulator joint and the No.7 pin of the filter joint are both connected with the No.3 pin of the second joint J9; The No.5 pin of the voltage regulator joint is connected with the No.6 pin of the filter joint; The No.8 pin of the filter joint is connected with the No.4 pin of the second joint J9.

9. The detection circuit of the current transformer according to claim 8, characterized in that: It further comprises a display module; The display module comprises a first indicator lamp LED1 and a second indicator lamp LED2; The positive electrode of the first indicator lamp LED1 is connected with the No.3 pin of the first joint J2, and the negative electrode of the first indicator lamp LED1 is grounded; The positive electrode of the second indicator lamp LED2 is connected with the No.9 pin of the first joint J2, and the negative electrode of the second indicator lamp LED2 is grounded.

10. The detection circuit of the current transformer according to claim 3, characterized in that: It further comprises a voltage regulating potentiometer; One end of the voltage regulating potentiometer is connected with the No.7 pin of the first joint, and the other end of the voltage regulating potentiometer is grounded.

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