Electromagnetic compatibility test power supply device

Abstract

The utility model discloses a power supply device for an electromagnetic compatibility test. The power supply device comprises a power supply module, a voltage comparison module and a relay, wherein the first end of the power supply module is connected with the first end of the voltage comparison module, and the second end of the voltage comparison module is connected with the first end of the relay; the voltage comparison module is used for outputting a first indication signal to the relay when the power supply voltage output by the power supply module is smaller than a first preset voltage, or the power supply voltage is larger than a second preset voltage; the relay is used for connecting a tested element to be subjected to electromagnetic compatibility test through a second end of the relay when the first indication signal is not received, and outputting power supply voltage to the tested element; and the relay is also used for disconnecting the connection with the tested element when receiving the first indication signal. According to the device provided by the invention, the connection with the tested element can be disconnected when the power supply voltage is unstable, so that the unstable power supply voltage is prevented from supplying power to the tested element, and the line protection is realized.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to an electromagnetic compatibility test power supply device. Background Art

[0002] As the electrification of vehicles accelerates, the number and types of electronic components in vehicles are also increasing, which greatly improves the entertainment and driving experience of passengers. However, due to the poor electromagnetic compatibility (EMC) of electronic components in traditional vehicles, there are many usage problems caused by EMC in traditional vehicles, such as interference with broadcasting equipment and inability to play normally, inability to start the car computer normally, and false faults of the instrument, which affects the entertainment and driving experience of passengers. Therefore, at present, car companies have higher and higher requirements for the EMC of electronic components in vehicles. EMC testing has not only changed from a recommended test to a required test, but also the requirements and content of EMC testing are increasing.

[0003] When performing EMC testing on electronic components, since EMC testing is extremely sensitive to electrical signals and switching power supplies will generate electromagnetic interference when working, switching power supplies cannot be used to power electronic components during EMC testing. Therefore, in order to avoid obvious electromagnetic interference, only batteries without switching characteristics can be used to power electronic components during EMC testing.

[0004] However, although batteries do not generate electromagnetic interference, when batteries are used to power electronic components undergoing EMC testing, if the battery power supply voltage is unstable, the battery’s simple structure will prevent it from quickly cutting off the power supply to protect the circuit, thus affecting the effective implementation of the EMC test and further affecting the accuracy of the EMC test results. Utility Model Content

[0005] The present application provides an electromagnetic compatibility test power supply device to solve the problem in the prior art that when a battery is used to power electronic components undergoing EMC testing, if the battery power supply voltage is unstable, the battery cannot quickly cut off the power supply to protect the circuit due to its simple structure, thereby affecting the effective implementation of the EMC test and further affecting the accuracy evaluation of the EMC test experimental results.

[0006] The present application provides an electromagnetic compatibility test power supply device, comprising a power supply module, a voltage comparison module and a relay; wherein a first end of the power supply module is connected to a first end of the voltage comparison module, and a second end of the voltage comparison module is connected to a first end of the relay;

[0007] The voltage comparison module is used to output a first indication signal to the relay when the supply voltage output by the power supply module is less than a first preset voltage, or when the supply voltage is greater than a second preset voltage; wherein the second preset voltage is greater than the first preset voltage;

[0008] The relay is used for connecting the component under test to be subjected to the electromagnetic compatibility test through the second end of the relay when the first indication signal is not received, and outputting the supply voltage to the component under test;

[0009] The relay is further configured to disconnect the measured element when receiving the first indication signal.

[0010] The electromagnetic compatibility test power supply device provided in the present application includes a power supply module, a voltage comparison module and a relay; wherein the first end of the power supply module is connected to the first end of the voltage comparison module, and the second end of the voltage comparison module is connected to the first end of the relay; the voltage comparison module is used to output a first indication signal to the relay when the power supply voltage output by the power supply module is less than a first preset voltage, or the power supply voltage is greater than a second preset voltage; wherein the second preset voltage is greater than the first preset voltage; the relay is used to connect to a component under test to be subjected to an electromagnetic compatibility test through the second end of the relay when the first indication signal is not received, and output the power supply voltage to the component under test; the relay is also used to disconnect from the component under test when the first indication signal is received. That is, the voltage comparison module in the electromagnetic compatibility test power supply device provided in the present application can compare the power supply voltage with the first preset voltage, and the power supply voltage with the second preset voltage, so as to output a first indication signal when the power supply voltage is less than the first preset voltage, or when the power supply voltage is greater than the second preset voltage, that is, when the power supply voltage is unstable, so that the relay disconnects the connection with the component under test when receiving the first indication signal, thereby avoiding the unstable power supply voltage from supplying power to the component under test, realizing the protection of the line, ensuring the effective implementation of the EMC test, and improving the accuracy evaluation of the EMC test experimental results. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a structural schematic diagram of the electromagnetic compatibility test power supply device provided by this application;

[0013] Figure 2is another structural schematic diagram of the electromagnetic compatibility test power supply device provided by the present application;

[0014] Figure 3a is another structural schematic diagram of the electromagnetic compatibility test power supply device provided by the present application;

[0015] Figure 3b is another structural schematic diagram of the electromagnetic compatibility test power supply device provided by the present application;

[0016] Figure 4 It is an exemplary structural diagram of the electromagnetic compatibility test power supply device provided in this application. DETAILED DESCRIPTION

[0017] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only the parts related to the present application, rather than all structures, are shown in the accompanying drawings.

[0018] Figure 1 is a structural schematic diagram of the electromagnetic compatibility test power supply device provided by this application, such as Figure 1 As shown, the electromagnetic compatibility test power supply device 10 provided in the present application includes: a power supply module 11, a voltage comparison module 12 and a relay 13. Among them, the first end of the power supply module 11 is connected to the first end of the voltage comparison module 12, and the second end of the voltage comparison module 12 is connected to the first end of the relay 13.

[0019] The voltage comparison module 12 is used to output a first indication signal to the relay 13 when the supply voltage output by the power supply module 11 is less than a first preset voltage, or when the supply voltage is greater than a second preset voltage.

[0020] The second preset voltage is greater than the first preset voltage.

[0021] The relay 13 is used to connect the component under test 01 to be subjected to the electromagnetic compatibility test through the second end of the relay 13 when the first indication signal is not received, and output a power supply voltage to the component under test 01 .

[0022] The relay 13 is further used to disconnect the measured element 01 when receiving the first indication signal.

[0023] Specifically, in the scenario of performing electromagnetic compatibility test on the tested component 01, it is necessary to power the tested component 01 to complete the electromagnetic compatibility test after the tested component 01 is powered. The electromagnetic compatibility test power supply device 10 is a device for supplying power to the tested component 01 to be tested for electromagnetic compatibility.

[0024] The power supply module 11 in the electromagnetic compatibility test power supply device 10 can be a battery, such as a lead-acid battery, a lithium-ion battery or a nickel-cadmium battery. Using a battery as the power supply module 11 can avoid electromagnetic interference generated when power supply equipment such as a switching power supply is powered. The first preset voltage can be the minimum voltage value when the power supply module 11 is working normally. For example, the first preset voltage can be 10V. The second preset voltage can be the maximum voltage value when the power supply module 11 is working normally. For example, the second preset voltage can be 15V. Because the power supply module 11 has a voltage range for normal operation, the second preset voltage is greater than the first preset voltage. If the selected power supply module 11 is different, the first preset voltage and the second preset voltage may be different.

[0025] The voltage comparison module 12 is a device that can output a signal according to the power supply voltage, for example, the voltage comparator can output a first indication signal according to the power supply voltage. The first indication signal is a signal that can disconnect the relay 13 from the measured element 01. In the present embodiment, the first indication signal can be a high level signal or a low level signal. The specific implementation of the first indication signal is determined according to the working principle of the relay 13. For example, if the relay 13 disconnects the connection with the measured element 01 when receiving a low level signal, the first indication signal is a low level signal, and if the relay 13 disconnects the connection with the measured element 01 when receiving a high level signal, the first indication signal is a high level signal. The relay 13 is an electrical control device that can complete the connection and disconnection of the circuit according to different input quantities. For example, when the relay 13 receives a low level signal, the low level signal reaches the preset input quantity requirement of the relay 13, thereby disconnecting the relay 13.

[0026] When the supply voltage output by the power supply module 11 is less than the first preset voltage, or the supply voltage is greater than the second preset voltage, that is, when the supply voltage output by the power supply module 11 is a voltage outside the normal working voltage range, it indicates that the power supply of the power supply module 11 is unstable. If the power supply device continues to supply power to the component under test 01 when the power supply of the power supply module 11 is unstable, it is possible to cause damage to the component under test 01. Therefore, the voltage comparison module 12 outputs a first indication signal to the relay 13 when the supply voltage is less than the first preset voltage, or the supply voltage is greater than the second preset voltage. When the relay 13 receives the first indication signal, it disconnects from the component under test 01, thereby protecting the component under test 01 and the circuit, thereby improving the test safety.

[0027] When the relay 13 does not receive the first indication signal, the component under test 01 to be subjected to the electromagnetic compatibility test is connected via the second end of the relay 13 , and a power supply voltage is output to the component under test 01 to complete power supply to the component under test 01 .

[0028] Optionally, the voltage comparison module 12 is further configured to output a second indication signal to the relay 13 when the supply voltage is greater than or equal to the first preset voltage and less than or equal to the second preset voltage. The relay 13 is configured to connect the measured element 01 through the second end of the relay 13 when receiving the second indication signal.

[0029] Further, the second indication signal is a signal that enables the relay 13 to connect to the measured element 01. In the present embodiment, the second indication signal may be a high level signal or a low level signal. The specific implementation of the second indication signal is determined according to the working principle of the relay 13. For example, if the relay 13 connects to the measured element 01 upon receiving a low level signal, the second indication signal is a low level signal, and if the relay 13 connects to the measured element 01 upon receiving a high level signal, the second indication signal is a high level signal.

[0030] When the power supply voltage output by the power supply module 11 is greater than or equal to the first preset voltage and less than or equal to the second preset voltage, that is, when the power supply voltage output by the power supply module 11 is a voltage within the voltage range of normal operation, it indicates that the power supply of the power supply module 11 is stable. If the power supply of the power supply module 11 is stable, the electromagnetic compatibility test power supply device 10 provided in this embodiment supplies power to the component under test 01 to complete the test of the component under test 01. Therefore, when the power supply voltage is greater than or equal to the first preset voltage and less than or equal to the second preset voltage, the voltage comparison module 12 outputs a second indication signal to the relay 13. When the relay 13 receives the second indication signal, it connects to the component under test 01 to be subjected to the electromagnetic compatibility test through the second end of the relay 13, and outputs the power supply voltage to the component under test 01 to complete the power supply to the component under test 01.

[0031] Optionally, the voltage comparison module 12 is a voltage comparator.

[0032] Specifically, the voltage comparator can compare the magnitudes of two voltages and output a high level or a low level.

[0033] Optionally, the power supply module 11 includes a vehicle-mounted battery.

[0034] Specifically, when performing EMC testing on electronic components of a vehicle, the power supply module 11 is a vehicle-mounted battery, which can simulate the power supply condition of the electronic components of the vehicle during daily use, thereby further improving the accuracy of the EMC test.

[0035] Furthermore, the first preset voltage is 12V, and the second preset voltage is 14V.

[0036] Specifically, the normal working voltage range of the vehicle-mounted battery is 12V to 14V. Therefore, when the vehicle-mounted battery is used as the power supply module 11, the first preset voltage is 12V and the second preset voltage is 14V.

[0037] For example, in Figure 1 In the structural diagram of the electromagnetic compatibility test power supply device 10 shown, the power supply module 11 is a vehicle-mounted battery, and the voltage comparison module 12 is a voltage comparator. When the power supply voltage is less than 12V, or the power supply voltage is greater than 14V, the voltage comparator outputs a low level, and the relay 13 disconnects from the component under test 01 after receiving the low level.

[0038] The electromagnetic compatibility test power supply device provided by the present application includes a power supply module, a voltage comparison module and a relay; wherein the first end of the power supply module is connected to the first end of the voltage comparison module, and the second end of the voltage comparison module is connected to the first end of the relay; the voltage comparison module is used to output a first indication signal to the relay when the power supply voltage output by the power supply module is less than the first preset voltage, or the power supply voltage is greater than the second preset voltage; wherein the second preset voltage is greater than the first preset voltage; the relay is used to connect the component under test to be subjected to the electromagnetic compatibility test through the second end of the relay when the first indication signal is not received, and output the power supply voltage to the component under test; the relay is also used to disconnect the connection with the component under test when the first indication signal is received. That is, the voltage comparison module in the electromagnetic compatibility test power supply device provided by the present application can compare the size of the power supply voltage with the first preset voltage, and the size of the power supply voltage with the second preset voltage. Therefore, when the power supply voltage is less than the first preset voltage, or the power supply voltage is greater than the second preset voltage, that is, when the power supply voltage is unstable, a first indication signal is output, so that the relay disconnects the connection with the component under test when receiving the first indication signal, thereby avoiding the unstable power supply voltage from supplying power to the component under test, realizing the protection of the line, ensuring the effective implementation of the EMC test, and improving the accuracy evaluation of the EMC test experimental results.

[0039] Optionally, Figure 2 It is another structural schematic diagram of the electromagnetic compatibility test power supply device 10 provided in the present application.

[0040] exist Figure 2 In the electromagnetic compatibility test power supply device 10 shown, the electromagnetic compatibility test power supply device 10 further includes a DC-DC voltage stabilizing module 14 .

[0041] A first end of the DC-DC voltage stabilizing module 14 is connected to a first end of the power supply module 11 , and a second end of the DC-DC voltage stabilizing module 14 is connected to a first end of the voltage comparison module 12 .

[0042] The voltage comparison module 12 is further configured to output a third indication signal to the DC-DC voltage stabilization module 14 when the supply voltage is less than the first preset voltage or when the supply voltage is greater than the second preset voltage.

[0043] The DC-DC voltage stabilizing module 14 is used to perform a first voltage stabilizing operation on the original power supply voltage output by the power supply module 11 and output the power supply voltage when the third instruction signal is not received.

[0044] The DC-DC voltage stabilizing module 14 is further configured to perform a second voltage stabilizing operation on the original supply voltage and output a supply voltage when receiving a third indication signal, so that the supply voltage is greater than or equal to the first preset voltage and less than or equal to the second preset voltage.

[0045] Specifically, the DC-DC voltage regulator module 14 is a module capable of adjusting the original supply voltage output by the power supply module 11 so that the supply voltage is greater than or equal to the first preset voltage and less than or equal to the second preset voltage. For example, the DC-DC voltage regulator module 14 can be a DC-DC regulator. The third indication signal is a signal that enables the DC-DC voltage regulator module 14 to adjust the original supply voltage output by the power supply module 11. In this embodiment, the third indication signal can be a high level signal or a low level signal. The specific implementation of the third indication signal is determined according to the working principle of the DC-DC voltage regulator module 14. For example, if the DC-DC voltage regulator module 14 performs a second voltage stabilization operation to adjust the original supply voltage when receiving a low level signal, the third indication signal is a low level signal, and if the DC-DC voltage regulator module 14 performs a second voltage stabilization operation to adjust the original supply voltage when receiving a high level signal, the third indication signal is a high level signal. The first voltage stabilization operation is an operation in which the DC-DC voltage stabilization module 14 eliminates the small-range fluctuations when the original power supply voltage fluctuates within a small range but the original power supply voltage is still greater than or equal to the first preset voltage and less than or equal to the second preset voltage. The second voltage stabilization operation is an operation in which the DC-DC voltage stabilization module 14 eliminates the large-range fluctuations when the original power supply voltage fluctuates within a large range, for example, when the original power supply voltage is less than the first preset voltage or greater than the second preset voltage.

[0046] Exemplarily, when the battery is overcharged, or when the battery voltage gradually decreases as the battery is used for a longer time, the DC-DC regulator can perform a second voltage stabilization operation on the original supply voltage of the battery, so that the supply voltage is greater than or equal to the first preset voltage and less than or equal to the second preset voltage.

[0047] When the DC-DC voltage stabilizing module 14 does not receive the third indication signal, it performs a first voltage stabilizing operation on the original power supply voltage output by the power supply module 11 to reduce fluctuations in the original power supply voltage and output the power supply voltage, thereby enhancing the stability of the power supply voltage.

[0048] When the power supply voltage is less than the first preset voltage, or the power supply voltage is greater than the second preset voltage, that is, when the power supply voltage output by the power supply module 11 is a voltage outside the normal working voltage range, it indicates that the power supply of the power supply module 11 is unstable. The voltage comparison module 12 is also used to output a third indication signal to the DC-DC voltage stabilizing module 14 when the power supply of the power supply module 11 is unstable. When the DC-DC voltage stabilizing module 14 receives the third indication signal, it performs a second voltage stabilizing operation on the original power supply voltage and then outputs the power supply voltage. At this time, the output power supply voltage is a voltage greater than or equal to the first preset voltage and less than or equal to the second preset voltage, that is, the power supply voltage used to supply power to the measured element 01 is a voltage greater than or equal to the first preset voltage and less than or equal to the second preset voltage.

[0049] The electromagnetic compatibility test power supply device provided in the present application adds a DC-DC voltage regulator module in the electromagnetic compatibility test power supply device, which can make the power supply of the power supply module more stable and avoid the power supply voltage being less than a first preset voltage or greater than a second preset voltage, thereby avoiding damage to the component under test, further improving the test safety of the electromagnetic compatibility test, and increasing the accuracy of the experimental results of the electromagnetic compatibility test.

[0050] Optionally, Figure 3a 1 is another structural diagram of the electromagnetic compatibility test power supply device 10 provided by the present application. Figure 1 or Figure 2 Based on the illustrated embodiment and various optional implementations, the electromagnetic compatibility test power supply device 10 further includes a voltage detection module 15 and a current detection module 16 . Figure 3a In Figure 1 Taking the example of adding a voltage detection module 15 and a current detection module 16 to the electromagnetic compatibility test power supply device 10, the electromagnetic compatibility test power supply device 10 is further described. Figure 3a As shown, the electromagnetic compatibility test power supply device 10 further includes a voltage detection module 15 and a current detection module 16 .

[0051] The first end of the voltage detection module 15 is connected to the second end of the power supply module 11 , and the second end of the voltage detection module 15 is connected to the target end, which is the first end of the power supply module 11 , the second end of the voltage comparison module 12 , or the second end of the relay 13 .

[0052] A first end of the current detection module 16 is connected to a second end of the relay 13 , a second end of the current detection module 16 is connected to the measured element 01 , and a third end of the current detection module 16 is also connected to a third end of the voltage comparison module 12 .

[0053] The voltage detection module 15 is used to measure and display the output voltage of the power supply module 11 .

[0054] The current detection module 16 is used to measure and display the power supply current, and send the power supply current to the voltage comparison module 12. The power supply current is the current input to the measured element 01.

[0055] The voltage comparison module 12 is further configured to output a fourth indication signal to the relay 13 when the voltage corresponding to the supply current is greater than a third preset voltage, so that the relay 13 is disconnected from the measured element 01. The third preset voltage is greater than or equal to the second preset voltage.

[0056] Specifically, the voltage detection module 15 is a module capable of measuring and displaying the output voltage of the power supply module 11, and the current detection module 16 is a module capable of measuring and displaying the current input to the measured element 01. The target end in this embodiment can be the first end of the power supply module 11, the second end of the voltage comparison module 12, or the second end of the relay 13. The first end of the voltage detection module 15 in this embodiment is connected to the second end of the power supply module 11, and the second end of the voltage detection module 15 is connected to the target end. Because the voltage detection module 15 itself has a resistance value far greater than that of other components in the circuit, the second end of the voltage detection module 15 is connected to any one of the first end of the power supply module 11, the second end of the voltage comparison module 12, or the second end of the relay 13, and the output voltage of the power supply module 11 can be measured. Figure 3a In the example, the connection between the second end of the voltage detection module 15 and the first end of the power supply module 11 is used for exemplary description. The output voltage of the power supply module 11 can be the power supply voltage or the original power supply voltage. For example, when the electromagnetic compatibility test power supply device 10 includes a DC-DC voltage regulator module 14, the output voltage of the power supply module 11 is the original power supply voltage. When the electromagnetic compatibility test power supply device 10 does not include a DC-DC voltage regulator module 14, the output voltage of the power supply module 11 is the power supply voltage. The fourth indication signal is a signal that enables the relay 13 to disconnect from the measured element 01 when the voltage comparison module 12 determines that the voltage corresponding to the power supply current is greater than the third preset voltage after receiving the power supply current sent by the current detection module. In this embodiment, the fourth indication signal can be a high-level signal or a low-level signal. The specific implementation method of the fourth indication signal is determined according to the working principle of the relay 13. For example, if the relay 13 disconnects from the measured element 01 when receiving a low level signal, the fourth indication signal is a low level signal, and if the relay 13 disconnects from the measured element 01 when receiving a high level signal, the fourth indication signal is a high level signal. The third preset voltage is a preset voltage for judging whether an overcurrent phenomenon occurs in the circuit.

[0057] The current detection module 16 measures and displays the power supply current, and sends the power supply current to the voltage comparison module 12, so that the voltage comparison module 12 can output a fourth indication signal to the relay 13 when the voltage corresponding to the power supply current is greater than the third preset voltage, so that the relay 13 is disconnected from the component under test 01 to protect the component under test 01. When an overcurrent phenomenon occurs in the electromagnetic compatibility test power supply device 10 provided in this embodiment, for example, when the current rise time of the power supply module 11 is greater than the preset current rise time, an overcurrent phenomenon may occur, and a large current is generated at this time. The current detection module 16 measures and displays the current, and sends the power supply current to the voltage comparison module 12. When the voltage corresponding to the power supply current is greater than the third preset voltage, the voltage comparison module 12 outputs a fourth indication signal to the relay 13, so that the relay 13 is disconnected from the component under test 01.

[0058] Optionally, the voltage detection module 15 includes a voltmeter, and the current detection module 16 includes an ammeter.

[0059] For example, Figure 3a As shown, the voltmeter measures and displays the output voltage of the power supply module 11, and the ammeter measures and displays the power supply current, and sends the power supply current to the voltage comparison module 12. When an overcurrent phenomenon occurs, the voltage comparison module 12 sends a low level to the relay 13, and the relay 13 disconnects from the measured element 01.

[0060] Optionally, the voltmeter is a mechanical voltmeter, and the ammeter is a mechanical ammeter.

[0061] Specifically, the voltmeter is a mechanical voltmeter, and the ammeter is a mechanical ammeter, which can avoid electromagnetic interference and further improve the accuracy of EMC testing.

[0062] Optionally, Figure 3b is another structural schematic diagram of the electromagnetic compatibility test power supply device 10 provided in the present application, such as Figure 3b As shown, the current detection module further includes a shunt 61 .

[0063] The first end of the shunt 61 is connected to the second end of the relay 13, the second end of the shunt 61 is connected to the measured element 01, the first end of the ammeter 62 is connected to the third end of the shunt 61, the second end of the ammeter 62 is connected to the fourth end of the shunt 61, and the third end of the ammeter 62 is also connected to the third end of the voltage comparison module 12.

[0064] The shunt 61 is used to shunt the supply current so that the shunt current flowing into the ammeter 62 is within the measuring range of the ammeter 62 .

[0065] The ammeter 62 is used to measure and display the shunt current, and send the shunt current to the voltage comparison module 12 .

[0066] The voltage comparison module 12 is used for outputting a fourth indication signal to the relay 13 when the shunt voltage corresponding to the shunt current is greater than a fourth preset voltage.

[0067] Specifically, after receiving the power supply current, the shunt 61 shunts the power supply current so that the shunt current obtained after shunting is within the range of the ammeter 62, thereby preventing the ammeter 62 from being damaged by excessive current. The ammeter 62 measures and displays the shunt current, and sends the shunt current to the voltage comparison module 12, so that the voltage comparison module 12 can output a fourth indication signal to the relay 13 when the shunt voltage corresponding to the shunt current is greater than the fourth preset voltage, thereby disconnecting the relay 13 from the measured component 01 to protect the measured component 01.

[0068] For example, the relay 13 will disconnect from the measured element 01 when receiving a low level signal. Figure 3b As shown, the voltmeter 51 measures and displays the output voltage of the power supply module 11, the shunt 61 shunts the power supply current, the ammeter 62 measures and displays the shunt current, and sends the shunt current to the voltage comparison module 12. When an overcurrent phenomenon occurs, the voltage comparison module 12 sends a fourth indication signal to the relay 13, and the fourth indication signal is a low-level signal at this time. After receiving the low-level signal, the relay 13 disconnects from the measured element 01.

[0069] The electromagnetic compatibility test power supply device provided by the present application adds a voltage detection module and a current detection module in the electromagnetic compatibility test power supply device. On the one hand, the power supply voltage and power supply current in the electromagnetic compatibility test power supply device can be obtained more intuitively, which is convenient for the experimenter to check and process. On the other hand, the voltage comparison module outputs a fourth indication signal to the relay according to the power supply current, so that the relay can disconnect from the component under test when an overcurrent phenomenon occurs, thereby further avoiding damage to the component under test and improving the test safety of the electromagnetic compatibility test.

[0070] For example, Figure 4 It is an exemplary structural diagram of the electromagnetic compatibility test power supply device 10 provided in this application. Figure 4 The electromagnetic compatibility test power supply device 10 shown in Figure 2 Based on the embodiment shown, it also includes a voltage detection module and a current detection module. And, Figure 4 In the description, an example is taken in which the voltage detection module includes a voltmeter 51 and the current detection module includes a shunt 61 and an ammeter 62 .

[0071] like Figure 4As shown, the first end of the power supply module 11 is connected to the first end of the DC-DC voltage regulator module 14, the second end of the DC-DC voltage regulator module 14 is connected to the first end of the voltage comparison module 12, the second end of the voltage comparison module 12 is connected to the first end of the relay 13, the second end of the relay 13 is connected to the first end of the shunt 61, and the second end of the shunt 61 is connected to the measured element 01. The first end of the voltmeter 51 is connected to the second end of the power supply module 11, the second end of the voltmeter 51 is connected to the second end of the voltage comparison module 12, the first end of the ammeter 62 is connected to the third end of the shunt 61, the second end of the ammeter 62 is connected to the fourth end of the shunt 61, and the third end of the ammeter 62 is connected to the third end of the voltage comparison module 12. When the power supply voltage is less than the first preset voltage, or greater than the second preset voltage, the voltage comparison module 12 sends a first indication signal to the relay 13, and sends a third indication signal to the DC-DC voltage regulator module 14, so that the relay 13 is disconnected from the measured element 01, and the DC-DC voltage regulator module 14 performs a second voltage stabilization operation. From the above two aspects, avoiding unstable voltage from being transmitted to the component under test 01 can further improve the safety of EMC testing. The voltmeter 51 measures and displays the output voltage of the power supply module 11, the shunt 61 shunts the power supply current, and the ammeter 62 measures and displays the shunt current. In addition, the ammeter 62 sends the shunt current to the voltage comparison module 12, so that the voltage comparison module 12 can output a fourth indication signal to the relay 13 when the shunt voltage corresponding to the shunt current is greater than the fourth preset voltage, so that the relay 13 disconnects the connection with the component under test 01 to protect the component under test 01.

[0072] It is worth noting that in the embodiment of the above-mentioned electromagnetic compatibility test power supply device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0073] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

Claims

1. An electromagnetic compatibility test power supply device, characterized in that: It includes a power supply module, a voltage comparison module and a relay; wherein the first end of the power supply module is connected to the first end of the voltage comparison module, and the second end of the voltage comparison module is connected to the first end of the relay; The voltage comparison module is used to output a first indication signal to the relay when the supply voltage output by the power supply module is less than a first preset voltage, or when the supply voltage is greater than a second preset voltage; wherein the second preset voltage is greater than the first preset voltage; The relay is used for connecting the component under test to be subjected to the electromagnetic compatibility test through the second end of the relay when the first indication signal is not received, and outputting the supply voltage to the component under test; The relay is further configured to disconnect the measured element when receiving the first indication signal.

2. The electromagnetic compatibility test power supply device according to claim 1, characterized in that: The voltage comparison module is further configured to output a second indication signal to the relay when the supply voltage is greater than or equal to the first preset voltage and less than or equal to a second preset voltage; The relay is used to connect the measured element through the second end of the relay when receiving the second indication signal.

3. The electromagnetic compatibility test power supply device according to claim 1, characterized in that: The electromagnetic compatibility test power supply device also includes a DC-DC voltage stabilization module; The first end of the DC-DC voltage stabilizing module is connected to the first end of the power supply module, and the second end of the DC-DC voltage stabilizing module is connected to the first end of the voltage comparison module; The voltage comparison module is further configured to output a third indication signal to the DC-DC voltage stabilization module when the supply voltage is less than the first preset voltage or when the supply voltage is greater than the second preset voltage; The DC-DC voltage stabilizing module is used to perform a first voltage stabilizing operation on the original power supply voltage output by the power supply module and output the power supply voltage when the third indication signal is not received; The DC-DC voltage stabilization module is also used to perform a second voltage stabilization operation on the original supply voltage when receiving the third indication signal, and output the supply voltage so that the supply voltage is greater than or equal to the first preset voltage and less than or equal to the second preset voltage.

4. The electromagnetic compatibility test power supply device according to claim 1, characterized in that: The electromagnetic compatibility test power supply device also includes a voltage detection module and a current detection module; The first end of the voltage detection module is connected to the second end of the power supply module, and the second end of the voltage detection module is connected to the target end; wherein the target end is the first end of the power supply module, the second end of the voltage comparison module or the second end of the relay; The first end of the current detection module is connected to the second end of the relay, the second end of the current detection module is connected to the measured element, and the third end of the current detection module is also connected to the third end of the voltage comparison module; The voltage detection module is used to measure and display the output voltage of the power supply module; The current detection module is used to measure and display the power supply current, and send the power supply current to the voltage comparison module; wherein the power supply current is the current input to the measured element; The voltage comparison module is also used to output a fourth indication signal to the relay when the voltage corresponding to the power supply current is greater than a third preset voltage, so that the relay disconnects from the measured element; wherein the third preset voltage is greater than or equal to the second preset voltage.

5. The electromagnetic compatibility test power supply device according to claim 4, characterized in that: The voltage detection module includes a voltage meter, and the current detection module includes an ammeter.

6. The electromagnetic compatibility test power supply device according to claim 5, characterized in that: The current detection module also includes a shunt; The first end of the shunt is connected to the second end of the relay, the second end of the shunt is connected to the measured element, the first end of the ammeter is connected to the third end of the shunt, the second end of the ammeter is connected to the fourth end of the shunt, and the third end of the ammeter is also connected to the third end of the voltage comparison module; The shunt is used to shunt the supply current so that the shunt current flowing into the ammeter is within the range of the ammeter; The ammeter is used to measure and display the shunt current, and send the shunt current to the voltage comparison module; The voltage comparison module is used for outputting the fourth indication signal to the relay when the shunt voltage corresponding to the shunt current is greater than a fourth preset voltage.

7. The electromagnetic compatibility test power supply device according to claim 5, characterized in that: The voltmeter is a mechanical voltmeter, and the ammeter is a mechanical ammeter.

8. The electromagnetic compatibility test power supply device according to claim 1, characterized in that: The power supply module includes an on-board battery.

9. The electromagnetic compatibility test power supply device according to claim 8, characterized in that: The first preset voltage is 12V, and the second preset voltage is 14V.

10. The electromagnetic compatibility test power supply device according to claim 1, characterized in that: The voltage comparison module is a voltage comparator.

Images