CN108279339B - Alternating-current charging box testing device - Google Patents
Alternating-current charging box testing device Download PDFInfo
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- CN108279339B CN108279339B CN201710015300.0A CN201710015300A CN108279339B CN 108279339 B CN108279339 B CN 108279339B CN 201710015300 A CN201710015300 A CN 201710015300A CN 108279339 B CN108279339 B CN 108279339B
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- 238000012360 testing method Methods 0.000 title claims abstract description 49
- 238000006243 chemical reaction Methods 0.000 claims abstract description 43
- 238000012544 monitoring process Methods 0.000 claims description 13
- 230000032683 aging Effects 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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Abstract
The embodiment of the invention provides an alternating-current charging box testing device, and relates to the technical field of electronics. The device comprises a voltage conversion unit, a first power storage unit, a second power storage unit, a first switch unit, a second switch unit and an inverter power supply unit; the input end of the voltage conversion unit is connected with the output end of the alternating current charging box, the output end of the voltage conversion unit is connected with the input end of the first switch unit, the first output end and the second output end of the first switch unit are respectively connected to the first input end and the second input end of the second switch unit through the first power storage unit and the second power storage unit, and the output end of the second switch unit is connected to the input end of the alternating current box through the inverter power supply unit. According to the embodiment of the invention, the AC charging box is subjected to the aging test in an energy feedback mode, so that the energy consumption can be saved in the aging test process of the AC charging box, the energy utilization rate is improved, and the test and production cost of the product are greatly reduced.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to an alternating current charging box testing device.
Background
With the popularization of domestic electric vehicles, a large number of electric vehicle charging equipment manufacturers are generated. In order to ensure the reliability of the electric vehicle charging equipment in the subsequent use process, the electric vehicle charging equipment must be subjected to an aging function test before leaving the factory, so that almost every manufacturer of the electric vehicle charging equipment faces the aging function test problem of the electric vehicle charging equipment in the production process.
However, at present, the aging function testing technology of the electric vehicle charging device adopted by most manufacturers of the electric vehicle charging device generally directly adopts a resistor or a battery as a load to perform the aging function test on the electric vehicle charging device, and the testing principle is as shown in fig. 1 and 2, so that the energy utilization rate of the testing mode is low and the cost is higher.
Disclosure of Invention
The embodiment of the invention aims to provide an alternating-current charging box testing device, which aims to solve the problems of low energy utilization rate and high cost of the existing aging function testing technology of electric automobile charging equipment.
The embodiment of the invention is realized in such a way that an alternating current charging box testing device comprises a voltage conversion unit, a first electric storage unit, a second electric storage unit, a first switch unit, a second switch unit and an inverter power supply unit;
The input end of the voltage conversion unit is connected with the output end of the alternating current charging box, the output end of the voltage conversion unit is connected with the input end of the first switch unit, the first output end and the second output end of the first switch unit are respectively connected to the first input end and the second input end of the second switch unit through the first power storage unit and the second power storage unit, and the output end of the second switch unit is connected to the input end of the alternating current box through the inverter power supply unit;
Wherein when the voltage conversion unit is connected with the first electric storage unit through the first switch unit, the voltage conversion unit is disconnected with the second electric storage unit; the inverter power supply unit is communicated with the second electric storage unit through the second switch unit, and when the inverter power supply unit is disconnected with the first electric storage unit, the voltage conversion unit converts alternating current output by the alternating current charging box into direct current to charge the first electric storage unit, and the inverter power supply unit converts direct current output by the second electric storage unit into alternating current to provide working voltage for the alternating current charging box; or alternatively
When the voltage conversion unit is connected with the second electric storage unit through the first switch unit, the voltage conversion unit is disconnected with the first electric storage unit; the inverter power supply unit is connected with the first electric storage unit through the second switch unit, when the inverter power supply unit is disconnected with the second electric storage unit, the voltage conversion unit converts alternating current output by the alternating current charging box into direct current to charge the second electric storage unit, and the inverter power supply unit converts direct current output by the first electric storage unit into alternating current to provide working voltage for the alternating current charging box.
On the basis of the technical scheme, the system further comprises a monitoring unit, wherein the data acquisition end of the monitoring unit is respectively connected with the data output ends of the alternating current charging box, the first electric storage unit and the second electric storage unit;
and the monitoring unit is used for monitoring the electric quantity information of the alternating-current charging box, the first electric storage unit and the second electric storage unit in real time.
On the basis of the technical scheme, the power supply system further comprises a third switch unit and a mains supply unit, wherein the output end of the third switch unit is connected with the input end of the alternating current charging box, and the first input end and the second input end of the third switch unit are respectively connected with the output end of the inverter power supply unit and the output end of the mains supply;
And if the circulating electric quantity of the alternating current charging box, the first electric storage unit and the second electric storage unit is completely consumed, the third switch unit is used for controlling the alternating current charging box to be connected with the mains supply unit and disconnected with the inverter supply unit, so that the mains supply unit provides working voltage for the alternating current charging box.
On the basis of the technical scheme, if the total electric quantity of the alternating current charging box, the first electric storage unit and the second electric storage unit reaches a preset electric quantity threshold value, the third switch unit is used for controlling the alternating current charging box to be disconnected from the mains supply unit and connected with the inverter power supply unit, so that the inverter power supply unit provides working voltage for the alternating current charging box.
On the basis of the technical scheme, the first switch unit comprises a first single-pole double-throw switch, the moving end of the first single-pole double-throw switch is the input end of the first switch unit, and the two fixed ends of the first single-pole double-throw switch are the first output end and the second output end of the first switch unit respectively.
On the basis of the technical scheme, the first switch unit comprises two first switches and two second switches which are electrically interlocked, wherein the input ends of the first switches and the second switches are commonly connected to form the input end of the first switch unit, and the output ends of the first switches and the second switches are respectively a first output end and a second output end of the first switch unit.
On the basis of the technical scheme, the second switch unit comprises a second single-pole double-throw switch, the movable end of the second single-pole double-throw switch is the output end of the second switch unit, and the two fixed ends of the second single-pole double-throw switch are the first input end and the second input end of the second switch unit respectively.
On the basis of the technical scheme, the second switch unit comprises a third switch and a fourth switch which are electrically interlocked, wherein the output ends of the third switch and the fourth switch are commonly connected to form the output end of the second switch unit, and the input ends of the third switch and the fourth switch are respectively a first input end and a second input end of the second switch unit.
On the basis of the technical scheme, the third switch unit comprises a third single-pole double-throw switch, the movable end of the third single-pole double-throw switch is the output end of the third switch unit, and the two fixed ends of the third single-pole double-throw switch are the first input end and the second input end of the third switch unit respectively.
On the basis of the technical scheme, the third switch unit comprises a fifth switch and a sixth switch which are electrically interlocked, wherein the output ends of the fifth switch and the sixth switch are commonly connected to form the output end of the third switch unit, and the input ends of the fifth switch and the sixth switch are respectively a first input end and a second input end of the third switch unit.
According to the alternating current charging box testing device provided by the embodiment of the invention, the aging test is carried out on the alternating current charging box in an energy feedback mode, so that the energy consumption can be saved in the aging test process of the alternating current charging box, the energy utilization rate is improved, and the testing and production cost of products are greatly reduced.
Drawings
Fig. 1 is a test schematic diagram of an aging function test technique of an electric vehicle charging device employed in the prior art;
FIG. 2 is a test schematic diagram of another technique for testing the burn-in function of an electric vehicle charging device employed in the prior art;
FIG. 3 is a schematic block diagram of an AC charging cartridge testing apparatus provided by an embodiment of the present invention;
Fig. 4 is a schematic block diagram of an ac charging testing device according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic block diagram of an ac charging cartridge test device provided in an embodiment of the present invention, and only a portion related to the embodiment is shown for convenience of explanation.
Referring to fig. 1, the present embodiment provides an ac charging cartridge test device including a voltage conversion unit 2, a first power storage unit 4, a second power storage unit 5, a first switching unit 3, a second switching unit 6, and an inverter power supply unit 7;
The input end of the voltage conversion unit 2 is connected with the output end of the alternating current charging box 1, the output end of the voltage conversion unit is connected with the input end of the first switch unit 3, the first output end and the second output end of the first switch unit 3 are respectively connected to the first input end and the second input end of the second switch unit 6 through the first electric storage unit and the second electric storage unit 5, and the output end of the second switch unit 6 is connected to the input end of the alternating current charging box through the inverter power supply unit 7;
When the voltage conversion unit 2 is turned on with the first electric storage unit 4 through the first switching unit 3, it is turned off with the second electric storage unit 5; the inverter power supply unit 7 is connected to the second electric storage unit 5 through the second switch unit 6, and when disconnected from the first electric storage unit 4, the voltage conversion unit 2 converts the alternating current output by the alternating current charging box 1 into direct current to charge the first electric storage unit 4, and the inverter power supply unit 7 converts the direct current output by the second electric storage unit 5 into alternating current to provide working voltage for the alternating current charging box 1; or alternatively
When the voltage conversion unit 2 is connected with the second electric storage unit 5 through the first switch unit 3, the voltage conversion unit is disconnected with the first electric storage unit 4; the inverter power supply unit 7 is turned on to the first power storage unit 4 through the second switch unit 6, and when turned off to the second power storage unit 5, the voltage conversion unit 2 converts the ac power output from the ac charging box 1 into dc power to charge the second power storage unit 5, and the inverter power supply unit 7 converts the dc power output from the first power storage unit 4 into ac power to supply the ac charging box 1 with an operating voltage.
Further, in the present embodiment, the voltage converting unit 2 includes, but is not limited to, an AC-DC conversion chip.
Further, in the present embodiment, the first electric storage unit 4 and the second electric storage unit 5 include, but are not limited to, lithium batteries, secondary batteries, and the like.
Further, in the present embodiment, the inverter power supply unit 7 includes, but is not limited to, a DC-AC conversion chip.
Further, in this embodiment, the test device for the ac charging box 1 further includes a third switch unit 8 and a mains supply unit 9, where an output end of the third switch unit 8 is connected to an input end of the ac charging box 1, and a first input end and a second input end of the third switch unit 8 are respectively connected to an output end of the inverter power supply unit 7 and an output end of the mains supply;
If the circulation power of the ac charging box 1, the first power storage unit 4 and the second power storage unit 5 is consumed, the third switch unit 8 controls the ac charging box 1 to be connected with the mains supply unit 9 and disconnected with the inverter power supply unit 7, so that the mains supply unit 9 provides the working voltage for the ac charging box 1.
Further, in this embodiment, if the total electric quantity of the ac charging box 1, the first electric storage unit 4 and the second electric storage unit 5 reaches a preset electric quantity threshold value, the third switch unit 8 controls the ac charging box 1 to be disconnected from the mains supply unit 9 and to be connected to the inverter power supply unit 7, so that the inverter power supply unit 7 provides an operating voltage for the ac charging box 1.
In this embodiment, the preset electric quantity threshold is an electric quantity value corresponding to the first electric storage unit 4 or the second electric storage unit 5 when fully charged, and is set by a tester according to the electric quantity of the first electric storage unit 4 or the second electric storage unit 5.
In this embodiment, the first switch unit 3 includes a first single-pole double-throw switch S1, a moving end of the first single-pole double-throw switch S1 is an input end of the first switch unit 3, and two stationary ends of the first single-pole double-throw switch S1 are a first output end and a second output end of the first switch unit 3 respectively.
In this embodiment, the second switch unit 6 includes a second single-pole double-throw switch S2, the active end of the second single-pole double-throw switch S2 is the output end of the second switch unit 6, and the two inactive ends of the second single-pole double-throw switch S2 are the first input end and the second input end of the second switch unit 6 respectively.
In this embodiment, the third switch unit 8 includes a third single-pole double-throw switch S3, the active end of the third single-pole double-throw switch S3 is the output end of the third switch unit 8, and the two inactive ends of the third single-pole double-throw switch S3 are the first input end and the second input end of the third switch unit 8 respectively.
In this embodiment, the first single-pole double-throw switch S1 is used for controlling the on/off of the first electric storage unit 4 and the second electric storage unit 5 and the voltage conversion unit 2, the second single-pole double-throw switch S2 is used for controlling the on/off of the first electric storage unit 4 and the second electric storage unit 5 and the inverter power supply unit 7, and the third single-pole double-throw switch S3 is used for controlling the on/off between the ac charging box 1 and the commercial power and the inverter power supply.
In this embodiment, since the electric storage units cannot be charged and discharged simultaneously, if one of the first electric storage unit 4 and the second electric storage unit 5 is charged as a load, the other electric storage unit is used as a power source to supply power to the ac charging box, and the first electric storage unit 4 and the second electric storage unit 5 may be used as a load and a power source alternately; the utility power unit 9 is only used as energy supplement after energy loss, if one of the first electric storage unit 4 and the second electric storage unit 5 is fully charged, the electric quantity in the electric storage unit can be recycled in the whole system until the electric quantity is consumed through the system internal loss, and then the utility power unit 9 is used for supplementing energy.
It can be seen from the above that, in the ac charging box testing device provided in this embodiment, the aging test is performed on the ac charging box by adopting the energy feedback manner, so that energy consumption can be saved in the aging test process of the ac charging box, the energy utilization rate is improved, and the testing and production costs of the product are greatly reduced.
Fig. 4 is a schematic block diagram of an ac charging cartridge testing apparatus according to another embodiment of the present invention. Only the portions relevant to the present embodiment are shown for convenience of explanation.
Referring to fig. 4, the present embodiment provides an ac charging cartridge test device including a voltage conversion unit 2, a first power storage unit 4, a second power storage unit 5, a first switching unit 3, a second switching unit 6, and an inverter power supply unit 7;
The input end of the voltage conversion unit 2 is connected with the output end of the alternating current charging box 1, the output end of the voltage conversion unit is connected with the input end of the first switch unit 3, the first output end and the second output end of the first switch unit 3 are respectively connected to the first input end and the second input end of the second switch unit 6 through the first electric storage unit and the second electric storage unit 5, and the output end of the second switch unit 6 is connected to the input end of the alternating current charging box through the inverter power supply unit 7;
When the voltage conversion unit 2 is turned on with the first electric storage unit 4 through the first switching unit 3, it is turned off with the second electric storage unit 5; the inverter power supply unit 7 is connected to the second electric storage unit 5 through the second switch unit 6, and when disconnected from the first electric storage unit 4, the voltage conversion unit 2 converts the alternating current output by the alternating current charging box 1 into direct current to charge the first electric storage unit 4, and the inverter power supply unit 7 converts the direct current output by the second electric storage unit 5 into alternating current to provide working voltage for the alternating current charging box 1; or alternatively
When the voltage conversion unit 2 is connected with the second electric storage unit 5 through the first switch unit 3, the voltage conversion unit is disconnected with the first electric storage unit 4; the inverter power supply unit 7 is turned on to the first power storage unit 4 through the second switch unit 6, and when turned off to the second power storage unit 5, the voltage conversion unit 2 converts the ac power output from the ac charging box 1 into dc power to charge the second power storage unit 5, and the inverter power supply unit 7 converts the dc power output from the first power storage unit 4 into ac power to supply the ac charging box 1 with an operating voltage.
Further, in the present embodiment, the voltage converting unit 2 includes, but is not limited to, an AC-DC conversion chip.
Further, in the present embodiment, the first electric storage unit 4 and the second electric storage unit 5 include, but are not limited to, lithium batteries, secondary batteries, and the like.
Further, in the present embodiment, the inverter power supply unit 7 includes, but is not limited to, a DC-AC conversion chip.
Further, in this embodiment, the test device for the ac charging box 1 further includes a monitoring unit, where a data collecting end of the monitoring unit is connected to data output ends of the ac charging box 1, the first electric storage unit 4, and the second electric storage unit 5, respectively;
the monitoring unit is used for monitoring the electric quantity information of the alternating-current charging box 1, the first electric storage unit 4 and the second electric storage unit 5 in real time.
In this embodiment, the charging process of the electric automobile may be reproduced by the monitoring unit from time to time, so that a tester at the monitoring unit may acquire the electric quantity data in the ac charging box 1 and the electric storage unit in real time during the charging process, and ensure the reality and accuracy of the test data.
Further, in this embodiment, the test device for the ac charging box 1 further includes a third switch unit 8 and a mains supply unit 9, where an output end of the third switch unit 8 is connected to an input end of the ac charging box 1, and a first input end and a second input end of the third switch unit 8 are respectively connected to an output end of the inverter power supply unit 7 and an output end of the mains supply;
If the circulation power of the ac charging box 1, the first power storage unit 4 and the second power storage unit 5 is consumed, the third switch unit 8 controls the ac charging box 1 to be connected with the mains supply unit 9 and disconnected with the inverter power supply unit 7, so that the mains supply unit 9 provides the working voltage for the ac charging box 1.
Further, in this embodiment, if the total electric quantity of the ac charging box 1, the first electric storage unit 4 and the second electric storage unit 5 reaches a preset electric quantity threshold value, the third switch unit 8 controls the ac charging box 1 to be disconnected from the mains supply unit 9 and to be connected to the inverter power supply unit 7, so that the inverter power supply unit 7 provides an operating voltage for the ac charging box 1.
In this embodiment, the preset electric quantity threshold is an electric quantity value corresponding to the first electric storage unit 4 or the second electric storage unit 5 when fully charged, and is set by a tester according to the electric quantity of the first electric storage unit 4 or the second electric storage unit 5.
In this embodiment, the first switch unit 3 includes two electrically interlocked first switches K1 and second switches, where input ends of the first switches K1 and the second switches K2 are commonly connected to form an input end of the first switch unit 3, and output ends of the first switches K1 and the second switches K2 are respectively a first output end and a second output end of the first switch unit 3.
In this embodiment, the second switch unit 6 includes two electrically interlocked third switches K3 and fourth switches K4, where output ends of the third switches K3 and the fourth switches K4 are commonly connected to form an output end of the second switch unit 6, and input ends of the third switches K3 and the fourth switches K4 are respectively a first input end and a second input end of the second switch unit 6.
In this embodiment, the third switch unit 8 includes two electrically interlocked fifth switches K5 and sixth switches K6, where output ends of the fifth switches K5 and the sixth switches K6 are commonly connected to form an output end of the third switch unit 8, and input ends of the fifth switches K5 and the sixth switches K6 are respectively a first input end and a second input end of the third switch unit 8.
In this embodiment, the first switch K1 and the second switch K2 are respectively used to control the on/off of the first electric storage unit 4 and the second electric storage unit 5 and the voltage conversion unit 2, the third switch K3 and the fourth switch K4 are respectively used to control the on/off of the first electric storage unit 4 and the second electric storage unit 5 and the inverter power supply unit 7, and the fifth switch K5 and the sixth switch K6 are respectively used to control the on/off between the ac charging box 1 and the utility power and the inverter power supply, wherein the first switch K1 and the second switch K2 cannot be closed simultaneously, the first switch K1 and the third switch K3 cannot be closed simultaneously, the second switch K2 and the fourth switch K4 cannot be closed simultaneously, and the fifth switch K5 and the sixth switch K6 cannot be closed simultaneously, and all of the switches that cannot be closed simultaneously can be realized by electrical interlocking.
It should be noted that the above-mentioned respective switch units implemented by electrical interlocking are only a preferred implementation example of the present invention, and are not intended to limit the present invention, and may be implemented by other forms of switches in other embodiments.
In this embodiment, since the electric storage units cannot be charged and discharged simultaneously, if one of the first electric storage unit 4 and the second electric storage unit 5 is charged as a load, the other electric storage unit is used as a power source to supply power to the ac charging box, and the first electric storage unit 4 and the second electric storage unit 5 may be used as a load and a power source alternately; the utility power unit 9 is only used as energy supplement after energy loss, if one of the first electric storage unit 4 and the second electric storage unit 5 is fully charged, the electric quantity in the electric storage unit can be recycled in the whole system until the electric quantity is consumed through the system internal loss, and then the utility power unit 9 is used for supplementing energy.
Therefore, it can be seen that the ac charging box testing device provided in this embodiment also performs an aging test on the ac charging box by adopting an energy feedback manner, so that energy consumption can be saved in the aging test process of the ac charging box, the energy utilization rate is improved, and the testing and production costs of the product are greatly reduced.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. An alternating current charging box testing device is characterized by comprising a voltage conversion unit, a first electric storage unit, a second electric storage unit, a first switch unit, a second switch unit and an inverter power supply unit;
The input end of the voltage conversion unit is connected with the output end of the alternating current charging box, the output end of the voltage conversion unit is connected with the input end of the first switch unit, the first output end and the second output end of the first switch unit are respectively connected to the first input end and the second input end of the second switch unit through the first power storage unit and the second power storage unit, and the output end of the second switch unit is connected to the input end of the alternating current charging box through the inverter power supply unit;
When the voltage conversion unit is connected with the first electric storage unit through the first switch unit, the voltage conversion unit is disconnected with the second electric storage unit; the inverter power supply unit is communicated with the second electric storage unit through the second switch unit, and when the inverter power supply unit is disconnected with the first electric storage unit, the voltage conversion unit converts alternating current output by the alternating current charging box into direct current to charge the first electric storage unit, and the inverter power supply unit converts direct current output by the second electric storage unit into alternating current to provide working voltage for the alternating current charging box; or alternatively
When the voltage conversion unit is connected with the second electric storage unit through the first switch unit, the voltage conversion unit is disconnected with the first electric storage unit; the inverter power supply unit is communicated with the first electric storage unit through the second switch unit, and when the inverter power supply unit is disconnected with the second electric storage unit, the voltage conversion unit converts alternating current output by the alternating current charging box into direct current to charge the second electric storage unit, and the inverter power supply unit converts the direct current output by the first electric storage unit into alternating current to provide working voltage for the alternating current charging box;
The power supply system further comprises a third switch unit and a mains supply unit, wherein the output end of the third switch unit is connected with the input end of the alternating current charging box, and the first input end and the second input end of the third switch unit are respectively connected with the output end of the inverter power supply unit and the output end of the mains supply;
If the circulating electric quantity of the alternating current charging box, the first electric storage unit and the second electric storage unit is completely consumed, the third switch unit is used for controlling the alternating current charging box to be connected with the mains supply unit and disconnected with the inverter supply unit, so that the mains supply unit provides working voltage for the alternating current charging box;
the data acquisition end of the monitoring unit is respectively connected with the data output ends of the alternating current charging box, the first electric storage unit and the second electric storage unit;
the monitoring unit is used for monitoring the electric quantity information of the alternating-current charging box, the first electric storage unit and the second electric storage unit in real time;
If the total electric quantity of the alternating current charging box, the first electric storage unit and the second electric storage unit reaches a preset electric quantity threshold value, the third switch unit is used for controlling the alternating current charging box to be disconnected from the mains supply unit and connected with the inverter power supply unit, so that the inverter power supply unit provides working voltage for the alternating current charging box; and the preset electric quantity threshold value is an electric quantity value corresponding to the condition that the first electric storage unit or the second electric storage unit is fully charged.
2. The ac charging cartridge testing device of claim 1, wherein the first switch unit comprises a first single pole double throw switch, the active end of the first single pole double throw switch being the input end of the first switch unit, the two inactive ends of the first single pole double throw switch being the first output end and the second output end of the first switch unit, respectively.
3. The ac charging cartridge testing device of claim 1, wherein the first switch unit comprises two electrically interlocked first and second switches, wherein the inputs of the first and second switches are commonly connected to form the input of the first switch unit, and the outputs of the first and second switches are the first and second outputs of the first switch unit, respectively.
4. The ac charging cartridge testing device of claim 1, wherein the second switch unit comprises a second single pole double throw switch, the active end of the second single pole double throw switch being the output end of the second switch unit, the two inactive ends of the second single pole double throw switch being the first input end and the second input end of the second switch unit, respectively.
5. The ac charging cartridge testing device of claim 1, wherein the second switch unit comprises two electrically interlocked third and fourth switches, wherein the outputs of the third and fourth switches are commonly connected to form the output of the second switch unit, and the inputs of the third and fourth switches are the first and second inputs of the second switch unit, respectively.
6. The ac charging cartridge testing device of claim 1, wherein the third switch unit comprises a third single pole double throw switch, the active end of the third single pole double throw switch being the output end of the third switch unit, the two inactive ends of the third single pole double throw switch being the first input end and the second input end of the third switch unit, respectively.
7. The ac charging cartridge testing device of claim 1, wherein the third switch unit comprises two electrically interlocked fifth and sixth switches, wherein the outputs of the fifth and sixth switches are commonly connected to form the output of the third switch unit, and the inputs of the fifth and sixth switches are the first and second inputs of the third switch unit, respectively.
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