CN216792413U - Short circuit detection device of output end of alternating current charging equipment and alternating current charging equipment - Google Patents
Short circuit detection device of output end of alternating current charging equipment and alternating current charging equipment Download PDFInfo
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- CN216792413U CN216792413U CN202121710741.0U CN202121710741U CN216792413U CN 216792413 U CN216792413 U CN 216792413U CN 202121710741 U CN202121710741 U CN 202121710741U CN 216792413 U CN216792413 U CN 216792413U
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Abstract
The utility model provides a short circuit detection device of an output end of alternating current charging equipment and the alternating current charging equipment, wherein the short circuit detection device comprises: a switch assembly; the other end of each switch component is correspondingly connected with the first end of one sampling component; the signal emission assembly is used for emitting square waves with different frequencies and same amplitude duty ratio to the second end of each sampling assembly; the signal analysis assembly is used for acquiring the sampling signal output by the third end of each sampling assembly and carrying out signal analysis according to the sampling signal; and the micro control assembly is used for judging whether the output end of the alternating current charging equipment is short-circuited according to the analysis result and controlling the switch assembly. The utility model can realize short-circuit fault detection between any two or more phases of three-phase four-wire output by the AC charging equipment, can accurately position the fault position, has no influence of a vehicle end circuit on the detection precision, and has simple structure, small required space and low cost.
Description
Technical Field
The utility model relates to the technical field of detection, in particular to a short circuit detection device of an output end of alternating current charging equipment and the alternating current charging equipment.
Background
With the rapid development of new energy, especially the high-speed development of the electric automobile industry, the charging equipment and the matching equipment thereof will also become the basic position of the new energy industry in the traffic field.
At present, the alternating current charging equipment part in the market does not meet the requirement of output short circuit protection, or only can realize single-phase detection or only can realize single-gun detection. The short circuit detection mode of the output end of the charging equipment in the related art is voltage detection of a control signal, and the mode has the defect that the RC (resistance capacitance) parameters of different charging vehicles are different, so that the detection accuracy cannot be ensured due to the change of the RC value of the vehicle end.
SUMMERY OF THE UTILITY MODEL
The utility model provides a short circuit detection device for the output end of alternating current charging equipment, which adopts square wave signal injection and spectrum analysis, can realize short circuit fault detection between any two or more phases of three-phase four lines output by the alternating current charging equipment, can accurately position the fault position, has no influence of a vehicle end circuit on the detection precision, and has the advantages of simple structure, small required space and low cost.
The utility model also provides alternating current charging equipment.
The technical scheme adopted by the utility model is as follows:
the utility model provides a short circuit detection device for an output end of alternating current charging equipment in a first aspect, which comprises: one end of the switch assembly is connected with the output end of the alternating current charging equipment, and each output line of the output end of the alternating current charging equipment is correspondingly connected with one switch assembly; the other end of each switch assembly is correspondingly connected with the first end of one sampling assembly; the second end of each sampling assembly is correspondingly connected with the signal transmitting assembly, and the signal transmitting assembly is used for transmitting square waves with different frequencies, same amplitudes and same duty ratios to the second end of each sampling assembly; the signal analysis assembly is respectively connected with the third end of each sampling assembly and is used for acquiring the sampling signal output by the third end of each sampling assembly and carrying out signal spectrum analysis on the sampling signal; and the micro control assembly is respectively connected with the switch assembly and the signal analysis assembly, and is used for judging whether the output end of the alternating current charging equipment is short-circuited according to an analysis result and controlling the switch assembly according to a judgment result and the working state of the alternating current charging equipment.
The short circuit detection device for the output end of the alternating current charging equipment provided by the utility model can also have the following accessory technical characteristics:
specifically, each of the switch assemblies includes: and the static contact of the relay is connected with the output end of the alternating current charging equipment, and the movable contact of the relay is connected with the first end of the sampling assembly.
Further, each of the sampling assemblies includes: a TVS (Transient Voltage super, Transient diode) tube, wherein one end of the TVS tube is used as a first end of the sampling component, and the other end of the TVS tube is grounded; one end of the first resistor is connected with one end of the TVS, and the other end of the first resistor is used as a second end of the sampling component; one end of the second resistor is connected with one end of the TVS, the anode of the diode is connected with the other end of the second resistor, and the cathode of the diode is used as the third end of the sampling assembly.
In a second aspect, the present invention provides an ac charging apparatus, including the short circuit detection device at the output end of the ac charging apparatus according to the first aspect of the present invention.
Specifically, the alternating current charging equipment is an alternating current charging pile.
The utility model has the beneficial effects that:
the utility model adopts square wave signal injection and spectrum analysis, can realize short-circuit fault detection between any two or more phases of three-phase four-wire output by the AC charging equipment, can accurately position the fault position, has no influence of a vehicle end circuit on the detection precision, and has simple structure, small required space and low cost.
Drawings
Fig. 1 is a block diagram of a short circuit detection device at an output terminal of an ac charging apparatus according to an embodiment of the present invention;
fig. 2 is a circuit topology diagram of a short circuit detection device at an output terminal of an ac charging apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a block diagram of a short circuit detection apparatus for an output terminal of an ac charging device according to an embodiment of the present invention, as shown in fig. 1, the apparatus includes: a switch component 1, a sampling component 2, a signal transmitting component 3, a signal analyzing component 4 and a micro-control component 5, wherein,
one end of the switch assembly 1 is connected with the output end of the alternating current charging device, and each output line L1, L2, L3 and N (fig. 1 takes a three-phase four-wire system as an example) of the output end of the alternating current charging device is correspondingly connected with one switch assembly 1; the other end of each switch component 1 is correspondingly connected with the first end of one sampling component 2; the second end of each sampling assembly 2 is connected with a signal transmitting assembly 3, and the signal transmitting assembly 3 is used for transmitting square waves with different frequencies, same amplitudes and same duty ratios to the second end of each sampling assembly; the signal analysis component 4 is respectively connected with the third end of each sampling component 2, and the signal analysis component 4 is used for acquiring the sampling signal output by the third end of each sampling component 2 and carrying out signal spectrum analysis on the sampling signal; the micro control assembly 5 is respectively connected with the switch assembly 1, the signal transmitting assembly 3 and the signal analyzing assembly 4, and the micro control assembly 5 is used for judging whether the output end of the alternating current charging equipment is short-circuited according to the analysis result and controlling the switch assembly 1 according to the judgment result and the working state of the alternating current charging equipment.
Specifically, as shown in fig. 1, when a working instruction of the ac charging device is not received, the micro control module 5 may control the switch module 1 to be turned off to isolate the short circuit detection circuit from the charging circuit; when a working instruction of the alternating current charging equipment is received, the micro control component 5 firstly controls the switch component 1 to be closed so as to carry out short circuit detection before charging, and the micro control component 5 controls the signal transmitting component 3 to transmit square waves with different frequencies, same amplitudes and same duty ratios to the second end of each sampling component 2. For the subsequent convenience of analyzing the waveform, the difference between the frequencies of the square waves transmitted on each line should be larger than a certain threshold, and should not be too small.
Then, the micro-control component 5 controls the signal analysis component 4 to perform signal spectrum analysis on the signal waves on each phase line, the spectrum analysis can be performed by utilizing Fourier transform, and the micro-control component 5 controls the signal analysis module to solve the main amplitude and the frequency value of energy distribution of the signal waves on each phase line. The micro-control component 5 can judge whether the output end of the alternating current charging equipment is short-circuited according to the analysis result, if a sampling signal output by the third end of the sampling component in a certain phase has components with different frequencies and similar amplitudes with the square wave sent by the phase, and the two-phase line is short-circuited by comparing the component frequency with the square wave frequency of the phase; if the sampling signal output by the third end of the sampling component in a certain phase does not have components with different frequencies and similar amplitudes with the square wave emitted by the phase, no short-circuit fault exists.
For example, if the frequency of input L1 is 4KHZ, the frequency of input L2 is 400HZ, the frequency of input L3 is 7K, the frequency of input N is 1KHZ, and if a 4KHZ frequency component is detected at L3 and the amplitude of the frequency component is close to the amplitude of the L3 input signal, L3 and L1 are shorted; if the frequency components of 4KHZ and 400HZ are detected at L3 and the amplitudes of the frequency components are close to the amplitudes of the input signals of L1 and L2, respectively, then the short circuit condition exists in L3, L1 and L2, and other similar short-circuit fault states can be sequentially judged. If the frequency components of 4KHZ, 400HZ and 1KHZ are detected at L3, but the amplitude of the frequency components is much smaller than that of the input signals of L1, L2 and L4, no short-circuit fault exists.
After the short circuit detection is finished, the micro control assembly 5 can control the switch assembly 1 to be switched off. If the micro control component 5 judges that the output end of the alternating current charging equipment has no short-circuit fault according to the analysis result, the alternating current charging equipment is allowed to be charged, if the micro control component 5 judges that the output end of the alternating current charging equipment has the short-circuit fault according to the analysis result, the alternating current charging equipment is forbidden to be charged, and the short-circuit detection can allow the charging through the rear part to be cleared.
Therefore, short-circuit fault detection between any two or multiple phases of lines in three-phase four lines output by the alternating-current charging equipment can be realized, the fault position can be accurately positioned, the detection precision is not influenced by a vehicle-end circuit, and the device has the advantages of simple structure, small required space and low cost
According to an embodiment of the present invention, as shown in fig. 2, each switch assembly 1 may include: and a static contact of the relay K is connected with the output end of the alternating current charging equipment, and a movable contact of the relay K is connected with the first end of the sampling component 2.
According to an embodiment of the present invention, as shown in fig. 2, each signal transmission assembly 2 includes: TVS tube, first resistor R1, second resistor R2 and diode D, wherein,
one end of the TVS is used as the first end of the sampling assembly, and the other end of the TVS tube is grounded; one end of the first resistor R1 is connected with one end of the TVS, and the other end of the first resistor R1 is used as the second end of the sampling assembly; one end of the second resistor R2 is connected to one end of the TVS, the anode of the diode D is connected to the other end of the second resistor R2, and the cathode of the diode D serves as the third end of the sampling assembly.
The circuit topology of the sampling component in fig. 2 is only an example, and the sampling component may be in other forms, which can achieve the purpose of the present invention.
In summary, according to the short circuit detection apparatus for the output terminal of the ac charging device of the present invention, one end of the switch component is connected to the output terminal of the ac charging device, each output line of the output terminal of the ac charging device is correspondingly connected to one switch component, the other end of each switch component is correspondingly connected to the first end of one sampling component, the second end of each sampling component is connected to the signal transmitting component, the signal transmitting component is configured to transmit square waves with different frequencies, same amplitudes, and same duty ratios to the second end of each sampling component, the signal analyzing component is respectively connected to the third end of each sampling component, the signal analyzing component is configured to obtain a sampling signal output from the third end of each sampling component, and perform signal spectrum analysis on the sampling signal, the micro control component is respectively connected to the switch component, the signal transmitting component, and the signal analyzing component, and the micro control assembly is used for judging whether the output end of the alternating current charging equipment is short-circuited according to the analysis result and controlling the switch assembly according to the judgment result and the working state of the alternating current charging equipment. The device adopts square wave signal injection and spectrum analysis, can realize not only that the short-circuit fault between arbitrary two-phase or the multiphase line in the three-phase four-wire of alternating current charging equipment output detects, and can pinpoint the fault location, and the detection precision is not influenced by car end circuit moreover, and simple structure, required space are little, with low costs.
In addition, the utility model also provides alternating current charging equipment which comprises the short circuit detection device of the output end of the alternating current charging equipment.
In the utility model, the alternating current charging equipment can be an alternating current charging pile.
According to the alternating-current charging equipment disclosed by the utility model, square wave signal injection and spectrum analysis are adopted, so that short-circuit fault detection between any two or more phases of three-phase four lines output by the alternating-current charging equipment can be realized, the fault position can be accurately positioned, the detection precision is not influenced by a vehicle-end circuit, and the alternating-current charging equipment is simple in structure, small in required space and low in cost.
In the description of the present invention, it is to be understood that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (3)
1. A short circuit detection device of an output end of an alternating current charging device is characterized by comprising:
one end of the switch assembly is connected with the output end of the alternating current charging equipment, and each output line of the output end of the alternating current charging equipment is correspondingly connected with one switch assembly;
the other end of each switch component is correspondingly connected with the first end of one sampling component;
the second end of each sampling assembly is connected with the signal transmitting assembly, and the signal transmitting assembly is used for transmitting square waves with different frequencies, same amplitudes and same duty ratios to the second end of each sampling assembly;
the signal analysis assembly is respectively connected with the third end of each sampling assembly and is used for acquiring a sampling signal output by the third end of each sampling assembly and carrying out signal spectrum analysis on the sampling signal;
the micro-control assembly is respectively connected with the switch assembly, the signal transmitting assembly and the signal analyzing assembly, and is used for judging whether the output end of the alternating-current charging equipment is short-circuited according to an analysis result and controlling the switch assembly according to a judgment result and the working state of the alternating-current charging equipment;
wherein each of the switch assemblies comprises: the static contact of the relay is connected with the output end of the alternating current charging equipment, and the movable contact of the relay is connected with the first end of the sampling assembly;
each of the sampling assemblies includes:
one end of the TVS is used as a first end of the sampling assembly, and the other end of the TVS is grounded;
one end of the first resistor is connected with one end of the TVS, and the other end of the first resistor is used as a second end of the sampling component;
a second resistor having one end connected to one end of the TVS,
and the anode of the diode is connected with the other end of the second resistor, and the cathode of the diode is used as the third end of the sampling component.
2. An ac charging apparatus comprising the short circuit detection device of the output terminal of the ac charging apparatus according to claim 1.
3. An AC charging apparatus as claimed in claim 2, wherein the AC charging apparatus is an AC charging post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121710741.0U CN216792413U (en) | 2021-07-27 | 2021-07-27 | Short circuit detection device of output end of alternating current charging equipment and alternating current charging equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121710741.0U CN216792413U (en) | 2021-07-27 | 2021-07-27 | Short circuit detection device of output end of alternating current charging equipment and alternating current charging equipment |
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| Publication Number | Publication Date |
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| CN216792413U true CN216792413U (en) | 2022-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121710741.0U Active CN216792413U (en) | 2021-07-27 | 2021-07-27 | Short circuit detection device of output end of alternating current charging equipment and alternating current charging equipment |
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2021
- 2021-07-27 CN CN202121710741.0U patent/CN216792413U/en active Active
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