Voltage tester

Abstract

The present disclosure relates to a voltage tester, comprising: a first filter connected to a voltage input terminal, used for filtering out a carrier signal of an input voltage, and obtaining a filtered input voltage; a boost rectifier connected to the first filter, used for boosting the filtered input voltage, and obtaining a boosted voltage; a DC / DC converter connected to the boost rectifier, used for converting the boosted voltage into a plurality of groups of voltages with different voltage ranges; a second filter comprising a plurality of low-pass filters, the plurality of low-pass filters being connected to a plurality of step-down DC / DC converters in a one-to-one correspondence, and used for filtering out switching harmonics in the plurality of groups of voltages, and obtaining an output voltage; an output module connected to both the second filter and a high-voltage vacuum contactor, used for receiving the output voltage and providing a target voltage range for the high-voltage vacuum contactor; and an action discrimination module connected to the high-voltage vacuum contactor, used for judging the closing and tripping actions of the high-voltage vacuum contactor.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy industry, and in particular to a voltage tester. Background Art

[0002] High-voltage vacuum contactors are commonly used in the energy industry to frequently connect and disconnect normal operating currents, and are usually used to remotely connect and disconnect frequently started and stopped high-voltage motors. Due to product quality issues and the degradation of electrical and mechanical performance after long-term frequent operation, high-voltage vacuum contactors are prone to erroneous opening and closing or refusal to open and close, which seriously threatens the safe operation of the system and affects corporate production.

[0003] In order to avoid the above problems of high-voltage vacuum contactors, it is necessary to use a voltage tester to test its minimum operating voltage to ensure the correct opening and closing of the high-voltage vacuum contactor. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a voltage tester, including a first filter, a boost rectifier, a second filter, a DC / DC converter, an output module and an action determination module;

[0005] The first filter is used to be connected to the voltage input terminal, and is used to filter out the carrier signal of the input voltage to obtain a filtered input voltage;

[0006] The boost rectifier is connected to the first filter and is used to boost the filtered input voltage to obtain a boosted voltage;

[0007] The DC / DC converter is connected to the boost rectifier and is used to convert the boosted voltage into multiple groups of voltages with different voltage ranges;

[0008] The second filter includes a plurality of low-pass filters, which are connected to the plurality of step-down DC / DC converters in a one-to-one correspondence and are used to filter out switching harmonics in the plurality of voltage groups to obtain an output voltage;

[0009] The output module is used to be connected to both the second filter and the high-voltage vacuum contactor, and is used to receive the output voltage and provide a target voltage range for the high-voltage vacuum contactor;

[0010] The action determination module is used to be connected to the high-voltage vacuum contactor and is used to determine the closing and tripping actions of the high-voltage vacuum contactor.

[0011] Optionally, a main control chip is further included, the main control chip is connected to the output module and the action identification module, and the main control chip is used to:

[0012] Control the output module to output a pulse voltage signal from low to high within the target voltage range to provide a target voltage for the high-voltage vacuum contactor;

[0013] When the action determination module determines that the high-voltage vacuum contactor has a closing or tripping action, the target voltage is determined to be the minimum action voltage of the high-voltage vacuum contactor.

[0014] Optionally, the main control chip is a DSP dedicated control chip, the main control chip is connected to the first filter, the boost rectifier, the second filter and the DC / DC converter, and the main control chip is used for:

[0015] Acquire the filtered input voltage, and output a PWM control signal of the boost rectifier to control the boost rectifier to boost the filtered input voltage;

[0016] The boosted voltage is acquired, and a PWM control signal of the DC / DC converter is output to control the DC / DC converter to convert the boosted voltage into a plurality of voltage groups with different voltage ranges.

[0017] Optionally, the input voltage is 220VAC.

[0018] Optionally, the boost rectifier is a single-phase full-bridge control, and the boost rectifier is used for:

[0019] The input voltage is boosted to 400 VDC.

[0020] Optionally, the DC / DC converter is a plurality of step-down DC / DC converters, and the DC / DC converter is full-bridge controlled, and the DC / DC converter is used for:

[0021] The boosted voltage is converted into two sets of voltages with voltage ranges of 66V-220VDC and 33V-110VDC.

[0022] Optionally, a first switching button is further included, wherein the first switching button is connected to the main control chip, and the main control chip is used to switch the target voltage range of the high-voltage vacuum contactor in response to a switching operation of the first switching button.

[0023] Optionally, a second switching button is further included, wherein the second switching button is connected to the main control chip, and the main control chip is used to switch the increase or decrease mode of the target voltage to manual or automatic in response to a switching operation of the second switching button.

[0024] Optionally, a first hand control is further included, wherein the first hand control is connected to the main control chip, and the main control chip is used to adjust the starting value of the target voltage in response to the operation of the first hand control.

[0025] Optionally, a second hand control is also included, which is connected to the main control chip, and the main control chip is used to adjust at least one of the increase or decrease range, increase or decrease step size and increase or decrease rate of the target voltage in response to the operation of the second hand control.

[0026] Optionally, a third hand control is further included, wherein the third hand control is connected to the main control chip, and the main control chip is used to adjust the output duration of the target voltage in response to the operation of the third hand control.

[0027] Optionally, a display screen is further included, which is connected to the main control chip and is used to display the target voltage and current.

[0028] Optionally, the network interface is connected to the main control chip, and the network interface is used to control the voltage tester through networking with a computer.

[0029] The voltage tester provided by the embodiments of the present disclosure may have the following beneficial effects:

[0030] The voltage tester first uses a first filter to filter out the carrier signal of the input voltage, then uses a boost rectifier to boost the filtered voltage, and then uses a step-down DC / DC converter to step down the boosted voltage to obtain multiple groups of voltages with different voltage ranges. In this way, the voltage test requirements of high-voltage vacuum contactors with different control voltages can be met, with strong pertinence, high measurement accuracy, and convenient operation. Secondly, the output current of the voltage tester can be adjusted to 30A within the output voltage range, which increases the output current of the voltage tester, meets the minimum action voltage test of the high-voltage vacuum contactor, and avoids the problem of the tester tripping during the test. Furthermore, the boost rectifier adopts single-phase full-bridge control, which is simple to control and has a high power factor. The DC / DC converter adopts full-bridge control, has high power, and high resonant conversion efficiency.

[0031] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0033] Figure 1 The figure is a schematic diagram of the structure of a voltage tester according to an exemplary embodiment.

[0034] Figure 2The present invention is a structural schematic diagram and a circuit diagram of a voltage tester according to an exemplary embodiment.

[0035] Figure 3 The figure is a schematic diagram of the structure of a voltage tester according to an exemplary embodiment.

[0036] Description of Reference Numerals

[0037] 1- First filter 2- Boost rectifier

[0038] 3-DC / DC converter 4-Second filter

[0039] 5-Output module 6-High voltage vacuum contactor

[0040] 7-Action identification module 8-Main control chip

[0041] 9- First switch button 10- Second switch button

[0042] 11- First Hand Controls 12- Second Hand Controls

[0043] 13- Third hand controls 14- Display screen

[0044] 15-Network Interface DETAILED DESCRIPTION

[0045] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0046] The inventors have found that in the prior art, a switch characteristic meter is usually used for testing to detect the minimum operating voltage of a high-voltage vacuum contactor. However, the switch characteristic meter is mainly designed for the mechanical characteristics of the switch device, with a focus on mechanical characteristics. Various test lines are not suitable for the minimum operating voltage test, which is inconvenient for on-site operation. Moreover, the minimum operating voltage tested by the meter often has deviations and insufficient accuracy, and is not targeted for the minimum operating voltage test. Secondly, the switch characteristic meter often has a small output capacity and cannot meet the minimum operating voltage test of the high-voltage vacuum contactor. During the test, the switch characteristic meter often has a protection tripping problem. The switch characteristic meter is expensive and difficult to maintain, resulting in a high cost for the minimum opening and closing operating voltage test of the high-voltage vacuum contactor.

[0047] In order to solve the above problems, the present invention provides a voltage tester for a high-voltage vacuum contactor. Figure 1is a schematic diagram of a voltage tester according to an exemplary embodiment. Figure 1 As shown, the voltage tester includes a first filter 1, a boost rectifier 2, a second filter 4, a DC / DC converter 3, an output module 5 and an action determination module 7;

[0048] The first filter 1 is used to be connected to the voltage input terminal, and is used to filter out the carrier signal of the input voltage to obtain a filtered input voltage;

[0049] The boost rectifier 2 is connected to the first filter 1 and is used to boost the filtered input voltage to obtain a boosted voltage;

[0050] The DC / DC converter 3 is connected to the boost rectifier 2 and is used to convert the boosted voltage into;

[0051] The second filter 4 includes a plurality of low-pass filters, which are connected to the plurality of step-down DC / DC converters 3 in a one-to-one correspondence, and are used to filter out switching harmonics in the plurality of voltage groups to obtain an output voltage;

[0052] The output module 5 is used to be connected to both the second filter 4 and the high-voltage vacuum contactor 6, and is used to receive the output voltage and provide a target voltage range for the high-voltage vacuum contactor 6;

[0053] It is used to connect with the high-voltage vacuum contactor 6 and to judge the closing and tripping actions of the high-voltage vacuum contactor 6.

[0054] First of all, it should be understood that the first filter 1 is used to filter out the carrier signal, and the cut-off frequency can be determined according to the carrier frequency, and can be set to between one tenth and one fifteenth of the carrier frequency. The first filter 1 can be of L type, which is simple to control and does not have resonance problems. LC type, LCL type or higher order filters can also be selected, which is not limited in the embodiments of the present disclosure. The second filter 4 is a low-pass filter, which is used to filter out switching harmonics and ensure the waveform quality of the output voltage and current. The embodiments of the present disclosure do not limit the type of the second filter 4.

[0055] The output module 5 can be connected to the closing (tripping) coil of the high-voltage vacuum contactor 6, and after receiving the output voltage output by the second filter 4, it provides a target voltage range for the high-voltage vacuum contactor 6. The action judgment module 7 can be connected to the main contacts of the high-voltage vacuum contactor 6, and judge the closing and tripping actions of the high-voltage vacuum contactor 6 according to the opening and closing conditions of the main contacts of the high-voltage vacuum contactor 6.

[0056] By using the above-mentioned voltage tester, the carrier signal of the input voltage can be filtered out by using a first filter, and then the voltage after filtering can be boosted by a boost rectifier, and then the boosted voltage can be stepped down by a buck DC / DC converter to obtain multiple groups of voltages with different voltage ranges. In this way, the voltage test requirements of high-voltage vacuum contactors with different control voltages can be met, which is highly targeted, has high measurement accuracy, and is easy to operate. Secondly, the output current of the voltage tester can be adjusted to 30A by adjusting the voltage within the output voltage range, which increases the output current of the voltage tester, meets the minimum action voltage test of the high-voltage vacuum contactor, and avoids the problem of the tester tripping during the test. Furthermore, the boost rectifier adopts single-phase full-bridge control, which is simple to control and has a high power factor. The DC / DC converter adopts full-bridge control, has high power, and has high resonant conversion efficiency.

[0057] In one embodiment, the input voltage is 220VAC.

[0058] In one embodiment, the boost rectifier 2 is a single-phase full-bridge control, and the boost rectifier 2 is used to boost the input voltage to 400 VDC.

[0059] For example, Figure 2 As shown, the boost rectifier 2 can be a single-phase full-bridge control, using the unidirectional conductivity of the diode for rectification, and has the characteristics of simple control and high power factor. The boost rectifier 2 converts the AC voltage after filtering output by the first filter 1 into a DC voltage. Of course, other control methods can also be used to boost and rectify the filtered input voltage, which is not limited in the embodiments of the present disclosure.

[0060] In addition, since the peak value of the 220V AC input voltage is 311V, the boost rectifier 2 is a boost circuit. Under no-load conditions, if the DC side voltage is greater than 311V, rectification can be achieved, but too low or too high a DC bus voltage will cause a large number of narrow pulses to appear in the switch, resulting in poor waveform quality. Too low a DC bus voltage will result in a decrease in load capacity. Therefore, the bus voltage can usually be selected to be 1.15 to 1.35 times the peak value of the AC input voltage. The embodiment of the present disclosure uses 400V as the bus voltage. Of course, voltages with other multiples of the voltage peak value can also be selected as the bus voltage, and the embodiment of the present disclosure is not limited to this.

[0061] In one embodiment, if Figure 2 As shown, the DC / DC converter 3 is a plurality of step-down DC / DC converters, and the DC / DC converter 3 is full-bridge controlled. The DC / DC converter 3 is used to convert the boosted voltage into two sets of voltages in the voltage range of 66V-220VDC and 33V-110VDC.

[0062] It should be understood that the common control voltage of the common high-voltage vacuum contactor is 110VDC or 220VDC, and the voltage test specification requirements are 33V-110V and 66V-220VDC. Therefore, to meet the needs of two groups at the same time, a step-down DC / DC converter can be used to step down the boosted voltage. Specifically, the boosted voltage output by the boost rectifier 2 can be converted into two groups of voltages with a voltage range of 33V-110V and 66V-220VDC, so as to perform voltage testing on the high-voltage vacuum contactor controlled by the two control voltages. Of course, for other types of high-voltage vacuum contactors, the boosted voltage output by the boost rectifier 2 can be converted into a voltage of a corresponding voltage range for voltage testing, and the disclosed embodiment is not limited to this.

[0063] For example, the DC / DC converter 3 can be full-bridge controlled, and has the characteristics of high power and high resonant conversion efficiency. Of course, other control methods can also be used to convert the boosted voltage output by the boost rectifier 2, and the embodiments of the present disclosure are not limited to this.

[0064] In one embodiment, if Figure 3 As shown, the voltage tester also includes a main control chip 8, which is connected to the output module 5 and the action discrimination module 7. The main control chip 8 is used to: control the output module 5 to output a pulse voltage signal from low to high within the target voltage range, so as to provide a target voltage for the high-voltage vacuum contactor 6, and when the action discrimination module 7 determines that the high-voltage vacuum contactor 6 has a closing or tripping action, the target voltage is determined to be the minimum action voltage of the high-voltage vacuum contactor 6.

[0065] It should be understood that when testing the minimum operating voltage of the high-voltage vacuum contactor 6, in order to improve the test efficiency, the output module 5 can output the pulse voltage signal in the process of the voltage value from low to high. In this way, in the process of outputting the pulse voltage signal from low to high within the target voltage range, when the action discrimination module 7 determines that the high-voltage vacuum contactor 6 has a closing or tripping action, the target voltage at this time can be determined to be the minimum operating voltage of the high-voltage vacuum contactor 6. Of course, in other test scenarios, the output mode of the pulse voltage signal can also be adjusted to perform voltage testing, and the embodiments of the present disclosure are not limited to this.

[0066] In one embodiment, the main control chip 8 is a DSP dedicated control chip, and the main control chip 8 is connected to the first filter 1, the boost rectifier 2, the second filter 4 and the DC / DC converter 3. The main control chip 8 is used to: first obtain the filtered input voltage, and output the PWM control signal of the boost rectifier 2 to control the boost rectifier 2 to boost the filtered input voltage, and then obtain the boosted voltage, and output the PWM control signal of the DC / DC converter 3 to control the DC / DC converter 3 to convert the boosted voltage into multiple groups of voltages with different voltage ranges.

[0067] For example, an ARM chip or other chips may also be used as the main control chip 8, which is not limited in the embodiments of the present disclosure.

[0068] In one embodiment, if Figure 3 As shown, the voltage tester also includes a first switching button 9 , which is connected to a main control chip 8 , and the main control chip 8 is used to switch the target voltage range of the high-voltage vacuum contactor 6 in response to a switching operation of the first switching button 9 .

[0069] It should be understood that the common control voltage of the common high-voltage vacuum contactor is 110VDC or 220VDC. Therefore, for different high-voltage vacuum contactors, the corresponding voltage range can be selected as the target voltage range of the high-voltage vacuum contactor. In this case, the target voltage range of the high-voltage vacuum contactor 6 can be switched by operating the first switching button 9.

[0070] For example, the first switch button 9 can be a button, by pressing the button to trigger the switching signal of the target voltage range, so that the target voltage range of the high-voltage vacuum contactor 6 can be switched from 66V-220VDC to 33V-110VDC, or from 33V-110VDC to 66V-220VDC, that is, from the current voltage range to another voltage range. The first switch button 9 can also be a knob, by twisting the knob to point to 66V-220VDC or 33V-110VDC to trigger the switching signal of the target voltage range, thereby switching the target voltage range of the high-voltage vacuum contactor 6. The disclosed embodiment does not limit the specific form of the first switch button 9 and its triggering method.

[0071] In one embodiment, if Figure 3 As shown, the voltage tester also includes a second switch button 10, which is connected to the main control chip 8. The main control chip 8 is used to switch the increase or decrease mode of the target voltage to manual or automatic in response to the switching operation of the second switch button 10.

[0072] It should be understood that when the control output module 5 outputs the pulse voltage signal from low to high within the target voltage range, the pulse voltage signal can be automatically increased or decreased by the main control chip 8, or can be manually controlled to increase or decrease, and the embodiment of the present disclosure does not limit this. In this case, the increase or decrease method of the target voltage can be switched by operating the second switch button 10.

[0073] For example, the second switch button 10 can be a switching signal that triggers the increase or decrease mode of the target voltage, so that the increase or decrease mode of the target voltage can be switched from automatic to manual, or from manual to automatic, that is, from the current increase or decrease mode to another increase or decrease mode. The second switch button 10 can also be a knob, and the switch signal of the increase or decrease mode of the target voltage is triggered by twisting the knob to point to automatic increase or decrease or manual increase or decrease, thereby switching the increase or decrease mode of the target voltage of the high-voltage vacuum contactor 6. The embodiment of the present disclosure does not limit the specific form of the second switch button 10 and its triggering mode.

[0074] In one embodiment, if Figure 3 As shown, the voltage tester further includes a first-hand control 11 , which is connected to the main control chip 8 , and the main control chip 8 is used to adjust the starting value of the target voltage in response to the operation of the first-hand control 11 .

[0075] It should be understood that, for different high-voltage vacuum contactors 6 and different voltage test requirements, the starting value of the target voltage can be set within the selected target voltage range to perform a more targeted voltage test. In this case, the starting value of the target voltage can be set by operating the first-hand control 11.

[0076] For example, the first-hand control 11 can be a button. By pressing the button, according to the selected target voltage range, one of the multiple starting values ​​set in the voltage range is selected as the starting value of the target voltage. For example, the selected target voltage range is 33V-110VDC. Corresponding to the voltage range, the multiple starting values ​​set for selection are 43V, 53V, 53V, 63V, etc. The default starting value is 33V. For this button, the starting value of the first target voltage is switched to 43V, and the starting value of the second target voltage is switched to 53V, and so on. The first-hand control 11 can also be two buttons, which are used to control the increase and decrease of the starting value of the target voltage, respectively. Each time the increase or decrease button is pressed, the starting value can be increased or decreased by 1V or 5V. Long pressing the increase or decrease button can make the starting value continuously added or subtracted. The first-hand control 11 can also be a knob, and the starting value of the target voltage is set by twisting the knob to point to the corresponding voltage value. The embodiment of the present disclosure does not limit the specific form of the first-hand control 11 and its triggering method.

[0077] In one embodiment, if Figure 3 As shown, the voltage tester also includes a second-hand control 12, which is connected to the main control chip 8. The main control chip 8 is used to adjust at least one of the increase or decrease range, increase or decrease step size, and increase or decrease rate of the target voltage in response to the operation of the second-hand control 12.

[0078] It should be understood that for different high-voltage vacuum contactors 6 and different voltage test requirements, a more targeted voltage increase or decrease range can be selected within the selected target voltage range, such as 60V-90VDC can be selected for increase or decrease within the voltage range of 33V-110VDC. On this basis, the step size of each increase or decrease of the target voltage and the rate of increase or decrease can also be set, so that voltage tests can be performed for different high-voltage vacuum contactors 6 and to meet different test requirements. In this case, the increase or decrease range, increase or decrease step size, and increase or decrease rate of the target voltage can be set by operating the second-hand control 12.

[0079] For example, the second hand control 12 can be three buttons. By pressing the three buttons respectively, one of the set multiple increase and decrease steps, multiple boost ranges and multiple boost rates is selected as the increase and decrease range, increase and decrease step and increase and decrease rate of the target voltage. The second hand control 12 can also be three groups of buttons, each group of buttons includes two buttons, which are used to control the increase and decrease of the increase and decrease range, increase and decrease step and increase and decrease rate, respectively. Each press of the increase or decrease button can increase or decrease the corresponding preset increase and decrease value in the increase and decrease range, increase and decrease step and increase and decrease rate. Long press the increase or decrease button to perform continuous addition or continuous subtraction. The second hand control 12 can also be three knobs. By twisting the three knobs to point to the corresponding increase and decrease range, increase and decrease step and increase and decrease rate, the increase and decrease range, increase and decrease step and increase and decrease rate can be set respectively. The embodiment of the present disclosure does not limit the specific form of the second hand control 12 and its triggering method.

[0080] In one embodiment, if Figure 3 As shown, the voltage tester also includes a third-hand control 13 , which is connected to the main control chip 8 , and the main control chip 8 is used to adjust the output duration of the target voltage in response to the operation of the third-hand control 13 .

[0081] For example, the third hand control 13 can be a button, by pressing the button, one of the multiple selected durations is selected as the output duration of the target voltage. For example, the multiple selected output durations are set to 2 seconds, 4 seconds, 6 seconds, 8 seconds, etc., and the default starting value is 1 second. For this button, the output duration of the target voltage is switched to 2 seconds by pressing the first time, and the starting value of the target voltage is switched to 4 seconds by pressing the second time, and so on. The third hand control 13 can also be two buttons, which are used to control the increase and decrease of the output duration of the target voltage, respectively. Each time the increase or decrease button is pressed, the output duration can be increased or decreased by 1 second or 2 seconds. Long pressing the increase or decrease button can make the output duration increase or decrease continuously. The third hand control 13 can also be a knob, and the starting value of the target voltage is set by twisting the knob to point to the corresponding duration. The specific form of the third hand control 13 and its triggering method are not limited in the embodiment of the present disclosure.

[0082] It should be understood that the above-mentioned first switch button 9, second switch button 10, first hand control 11, second hand control 12 and third hand control 13 can be integrated into one or more multi-functional buttons, and their corresponding functions can be realized through different triggering methods, which is not limited to the embodiments of the present disclosure.

[0083] In one embodiment, if Figure 3 As shown, the voltage tester further includes a display screen 14, which is connected to the main control chip 8 and is used to display the target voltage and current.

[0084] For example, the display screen 14 can be used to display the target voltage and current, as well as the target voltage range, increase and decrease method, starting value, increase and decrease range, increase and decrease step, increase and decrease rate, output duration and final voltage test result of the high-voltage vacuum contactor 6, which is not limited in the embodiment of the present disclosure. The display screen 14 can use a configuration screen or other screens, which is not limited in the embodiment of the present disclosure.

[0085] In one embodiment, if Figure 3 As shown, the voltage tester further includes a network interface 15, which is connected to the main control chip 8 and is used to connect the voltage tester to a computer for network control.

[0086] For example, the network interface 15 is used to connect the voltage tester to the computer for network control, such as controlling the target voltage range, increase / decrease mode, starting value, increase / decrease range, increase / decrease step, increase / decrease rate, and output duration of the high-voltage vacuum contactor 6 through the terminal, and displaying the above parameters and the final voltage test result on the terminal. The embodiment of the present disclosure does not limit the location and specific type of the network interface 15.

[0087] In one embodiment, a discharge circuit is also included. The discharge circuit includes a MOSFET and a discharge resistor. The MOSFET and the discharge resistor are connected in series and then connected in parallel to the two ends of the output capacitor of the output module 5 .

[0088] It should be understood that since the output module 5 is a coil, and the coil is an inductor, when a large current is applied to the output module 5 and then directly disconnected, the inductor will induce a high voltage, causing damage to the power supply device or the high-voltage vacuum contactor 6. Therefore, a discharge path can be set for the inductor to protect the power supply device and the high-voltage vacuum contactor 6.

[0089] For example, when the power supply outputs voltage, the MOS tube is open and the discharge circuit does not work. When the output voltage stops, the main control chip 8 can output a high level to turn on the MOS tube. Since the MOS tube is connected in series with a discharge resistor, the energy on the inductor will pass through the path formed by the MOS tube and the discharge resistor, and the energy will be consumed on the resistor.

[0090] It should also be understood that the switching characteristic meter in the prior art uses a linear power supply, which is difficult to output large currents and has large losses. Its efficiency is about 30% to 40%. The embodiment of the present disclosure uses a switching power supply, and its efficiency can reach more than 80%.

[0091] In addition, the output current of the switch characteristic tester in the prior art generally does not exceed 20A, while at the moment of closing and tripping of the high-voltage vacuum contactor, the coil working current can reach 20-25A, which will cause the instrument protection tripping during the test of the high-voltage vacuum contactor. Since the resistance of the coil of the high-voltage vacuum contactor is fixed at a fixed frequency, the current in the coil can be changed by changing the applied voltage. Therefore, through the above-mentioned voltage tester, the output current of the voltage tester can reach 30A by adjusting the voltage, which greatly increases the output current of the voltage tester, meets the minimum operating voltage test of the high-voltage vacuum contactor, and avoids the problem of the tester tripping during the test.

[0092] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0093] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0094] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A voltage tester, characterized in that: It includes a first filter, a boost rectifier, a second filter, a DC / DC converter, an output module and an action discrimination module; The first filter is used to be connected to the voltage input terminal, and is used to filter out the carrier signal of the input voltage to obtain a filtered input voltage; The boost rectifier is connected to the first filter and is used to boost the filtered input voltage to obtain a boosted voltage; The DC / DC converter is connected to the boost rectifier and is used to convert the boosted voltage into multiple groups of voltages with different voltage ranges; The second filter includes a plurality of low-pass filters, which are connected to a plurality of step-down DC / DC converters in a one-to-one correspondence, and are used to filter out switching harmonics in the plurality of voltage groups to obtain an output voltage; The output module is used to be connected to both the second filter and the high-voltage vacuum contactor, and is used to receive the output voltage and provide a target voltage range for the high-voltage vacuum contactor; The action determination module is used to be connected to the high-voltage vacuum contactor and is used to determine the closing and tripping actions of the high-voltage vacuum contactor; It also includes a main control chip, which is connected to the output module and the action identification module, and is used for: Control the output module to output a pulse voltage signal from low to high within the target voltage range to provide a target voltage for the high-voltage vacuum contactor; When the action discrimination module determines that the high-voltage vacuum contactor has a closing or tripping action, determining the target voltage to be the minimum action voltage of the high-voltage vacuum contactor; The main control chip is a DSP dedicated control chip, and the main control chip is connected to the first filter, the boost rectifier, the second filter and the DC / DC converter, and the main control chip is used for: Acquire the filtered input voltage, and output a PWM control signal of the boost rectifier to control the boost rectifier to boost the filtered input voltage; Acquire the boosted voltage, and output a PWM control signal of the DC / DC converter to control the DC / DC converter to convert the boosted voltage into a plurality of voltage groups with different voltage ranges; Also includes a first switching button, the first switching button is connected to the main control chip, the main control chip is used to switch the target voltage range of the high-voltage vacuum contactor in response to the switching operation of the first switching button; It also includes a second switching button, which is connected to the main control chip. The main control chip is used to switch the increase or decrease mode of the target voltage to manual or automatic in response to the switching operation of the second switching button.

2. The voltage tester according to claim 1, characterized in that: The input voltage is 220VAC.

3. The voltage tester according to claim 1, characterized in that: The boost rectifier is a single-phase full-bridge control, and the boost rectifier is used for: The input voltage is boosted to 400 VDC.

4. The voltage tester according to claim 3, characterized in that: The DC / DC converter is a plurality of step-down DC / DC converters, and the DC / DC converter is full-bridge controlled, and the DC / DC converter is used for: The boosted voltage is converted into two sets of voltages with voltage ranges of 66V-220VDC and 33V-110VDC.

5. The voltage tester according to claim 1, characterized in that: It also includes a first hand control, which is connected to the main control chip, and the main control chip is used to adjust the starting value of the target voltage in response to the operation of the first hand control.

6. The voltage tester according to claim 1, characterized in that: It also includes a second hand control, which is connected to the main control chip. The main control chip is used to adjust at least one of the increase or decrease range, increase or decrease step size and increase or decrease rate of the target voltage in response to the operation of the second hand control.

7. The voltage tester according to claim 1, characterized in that: It also includes a third-hand control, which is connected to the main control chip. The main control chip is used to adjust the output duration of the target voltage in response to the operation of the third-hand control.

8. The voltage tester according to claim 1, characterized in that: It also includes a display screen connected to the main control chip, and the display screen is used to display the target voltage and current.

9. The voltage tester according to claim 1, characterized in that: It also includes a network interface connected to the main control chip, and the network interface is used to connect the voltage tester to a computer for network control.

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