CN214539917U - Relay detection circuit of alternating-current charging pile - Google Patents
Relay detection circuit of alternating-current charging pile Download PDFInfo
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- CN214539917U CN214539917U CN202120301061.7U CN202120301061U CN214539917U CN 214539917 U CN214539917 U CN 214539917U CN 202120301061 U CN202120301061 U CN 202120301061U CN 214539917 U CN214539917 U CN 214539917U
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Abstract
The application discloses alternating-current charging stake's relay detection circuitry, it includes: a first relay K1 configured on the L line, a first end of the first relay K1 being electrically connected to the first sampling point of the L line, a second end of the first relay K1 being electrically connected to the second sampling point of the L line, a second relay K2 configured on the N line, a first end of the second relay K2 being electrically connected to the third sampling point of the N line, a second end of the second relay K2 being electrically connected to the fourth sampling point of the N line, a ninth impedance element Z9, one end of which being electrically connected to the fourth sampling point D and the other end being electrically connected to the first sampling point a; MCU processing module, it is respectively through sampling circuit electric connection first sampling point, second sampling point, third sampling point and fourth sampling point in order to obtain its voltage information to judge first relay K1 and second relay K2's state based on the voltage information who obtains, whether take place the adhesion, make the testing result more reliable, the false detection can not appear, promotes the reliability of product.
Description
Technical Field
The application relates to the technical field of detection, and specifically relates to an alternating-current charging stake's relay detection circuitry.
Background
Alternating-current charging stake is extensively used for charging for the electric motor car, if the relay adhesion can not in time detect the damage that can lead to charging circuit during its operation. At present, a voltage comparison method is mostly adopted in alternating-current charging pile detection, whether the L-line relay is adhered or not can only be detected during detection, and for the N-line relay, because the voltage of the N-line to the ground is close to 0V, certain impedance exists in the output N-line to the ground, and the voltage of the N-line to the ground is close to 0V, so that misjudgment easily occurs during voltage comparison and the misjudgment cannot be accurately judged.
Therefore, there is a need to improve the existing L-line/N-line relay sticking detection circuit.
Disclosure of Invention
To overcome the above disadvantages, the present application aims to: provided is a relay adhesion detection circuit.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the utility model provides a relay detection circuitry of alternating-current charging stake which characterized in that includes:
a first relay K1 disposed on the L line, wherein a first end of the first relay K1 is electrically connected to a first sampling point of the L line, a second end of the first relay K1 is electrically connected to a second sampling point of the L line,
a second relay K2 disposed on the N line, wherein a first end of the second relay K2 is electrically connected to a third sampling point of the N line, a second end of the second relay K2 is electrically connected to a fourth sampling point of the N line,
a ninth impedance element Z9, one end of which is electrically connected to the fourth sampling point D and the other end of which is electrically connected to the first sampling point a;
and the MCU processing module is electrically connected with the first sampling point, the second sampling point, the third sampling point and the fourth sampling point through the voltage division sampling circuit respectively so as to acquire voltage information of the first sampling point, the second sampling point, the third sampling point and the fourth sampling point, and judges the states of the first relay K1 and the second relay K2 based on the acquired voltage information. By the design, the impedance element Z9 is introduced between the input L line and the output N line, the impedance network of the system is changed, and compared with the existing N line, the voltage of the ground is close to 0V, stable comparison voltage is obtained, so that whether the first relay K1 and the second relay K2 are adhered or not is accurately detected according to the comparison voltage, and the detection and judgment precision is greatly improved.
Preferably, the voltage division sampling circuit includes:
one end of the sixth impedance element Z6 is electrically connected to the first sampling point a of the L-line, the other end is electrically connected to the MCU processing module and one end of the first impedance element Z1, the other end of the first impedance element Z1 is electrically grounded,
one end of the seventh impedance element Z7 is electrically connected to the second sampling point B of the L-line, the other end is electrically connected to the MCU processing module and one end of the second impedance Z2, the other end of the second impedance Z2 is electrically grounded,
a first relay K1 disposed between the first sampling point A and the second sampling point B,
one end of the fifth impedance element Z5 is electrically connected to the third sampling point C of the N line, the other end is electrically connected to the MCU processing module and one end of the third impedance element Z3, the other end of the third impedance element Z3 is electrically grounded,
one end of the eighth impedance element Z8 is electrically connected to the fourth sampling point D of the N line, the other end is electrically connected to the MCU processing module and one end of the fourth impedance element Z4, the other end of the fourth impedance element Z4 is electrically grounded, the second relay K2 is disposed between the third sampling point C and the fourth sampling point D,
one end of the tenth impedance element Z10 is electrically connected to the fourth sampling point D, and the other end is electrically connected to the ground GND,
one end of the eleventh impedance element Z11 is electrically connected to the second sampling point B, and the other end is electrically grounded to GND.
Preferably, the ninth impedance element Z9 is a capacitor.
Preferably, the ninth impedance element Z9 is a combination of a capacitor and a resistor.
Preferably, this alternating-current charging stake's relay detection circuitry, its characterized in that includes:
when the second relay K2 is in the off state,
and if the difference value between the voltage of the first sampling point and the voltage of the second sampling point, which is obtained by the MCU processing module, is smaller than a preset value, the first relay is judged to be adhered (namely the relay contact is adhered).
Preferably, this alternating-current charging stake's relay detection circuitry, its characterized in that includes:
when the second relay K2 is in the off state,
and if the difference value of the voltage of the third sampling point and the voltage of the fourth sampling point obtained by the MCU processing module is smaller than a preset value, judging that the second relay is adhered (namely the relay contact is adhered).
Advantageous effects
Compared with the prior art, the relay detection circuit of alternating-current charging stake that this application provided can detect L simultaneously, whether the relay of N line adheres for it is more reliable to detect, can not appear the false detection, has promoted the reliability of product.
Drawings
FIG. 1 is a schematic diagram of a relay open topology of a relay detection circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a closed topology of a relay according to the embodiment of the present application in fig. 1.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present application. The conditions employed in the examples may be further adjusted as determined by the particular manufacturer, and the conditions not specified are typically those used in routine experimentation.
In the present application, the terms "upper", "lower", "inside", "middle", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Examples
The application provides a relay detection circuitry of alternating-current charging stake (for detecting relay contact adhesion), this detection circuitry includes: an MCU processing module for processing the signals of the MCU,
a first sampling point a and a second sampling point B are disposed on the L-line, a first relay K1 (also called contactor K1) is disposed between the first sampling point a and the second sampling point B, the L-line is electrically disconnected by the first relay K1,
a third sampling point C and a fourth sampling point D are disposed on the N line, a second relay K2 (also called contactor K2) is disposed between the third sampling point C and the fourth sampling point D, the N line is electrically disconnected by the second relay 2,
this MCU processing module electric connection these 4 sampling points to judge L based on the voltage information of sampling, whether the adhesion takes place for the relay of N line, make the testing result more reliable, the false detection can not appear, has promoted the reliability of product. The detection circuit judges whether the relay is adhered or not by detecting the voltage between the relay contacts (the relay contacts are adhered).
Next, a relay detection circuit of an ac charging pile according to an embodiment of the present application will be described with reference to fig. 1 and 2.
The detection circuit includes: the impedance elements Z1-Z8,
one end of the impedance element Z6 is electrically connected to the first sampling point a (sampling voltage Va) of the L-line, the other end is electrically connected to one end of the MCU processing module and impedance element Z1, the other end of the impedance element Z1 is electrically grounded, one end of the impedance element Z7 is electrically connected to the second sampling point B (sampling voltage Vb) of the L-line, the other end is electrically connected to one end of the MCU processing module and impedance element Z2, the other end of the impedance element Z2 is electrically grounded, the first relay K1 is disposed between the first sampling point a and the second sampling point B, and is electrically connected to a control module (not shown) for turning on/off based on a command,
one end of the impedance device Z5 is electrically connected to the third sampling point C (sampling voltage Vc) of the N line, the other end is electrically connected to the MCU processing module and one end of the impedance device Z3, the other end of the impedance device Z3 is electrically grounded,
one end of the impedance element Z8 is electrically connected to the fourth sampling point D (sampling voltage Vd) of the N line, the other end is electrically connected to the MCU processing module and one end of the impedance element Z4, the other end of the impedance element Z4 is electrically grounded, the second relay K2 is disposed between the third sampling point C and the fourth sampling point D, and is electrically connected to the control module (not shown) for turning on/off based on the command,
one end of the impedance element Z10 is electrically connected to the fourth sampling point D, and the other end is electrically grounded GND,
one end of the impedance element Z11 is electrically connected to the second sampling point B, the other end is electrically grounded GND,
one end of the impedance element Z9 is electrically connected to the fourth sampling point D, and the other end is electrically connected to the first sampling point a.
Thus when the first relay K1 and the second relay K2 are not closed (see figure 1),
the voltage Va at the point a (first sampling point) is close to 220V, and the voltage Vb at the point B (second sampling point) is close to 0V due to the impedance Z11.
The voltage Vc at point C (third sampling point) is close to 0V, and the voltage Vd at point D (fourth sampling point) is Va
(Z10/(Z9+ Z10)). When the first relay K1 and the second relay K2 are closed (see fig. 2),
the voltage Va at the point a (first sampling point) is the same as the voltage Vb at the point B (second sampling point).
The voltage Vc at point C (third sampling point) is the same as the voltage at point D (fourth sampling point).
In the above embodiment, the voltage value of Vd can be controlled to a preset value (e.g. 30V) by adjusting the resistance voltage division, the voltage difference between the voltage Va at the point a and the voltage Vb at the point B is set to V1, and the voltage difference between the voltage Vc at the point C and the voltage Vd at the point D is set to V2, so that when the first relay K1 and the second relay K2 are not attracted, the voltage value of V1 is close to 220V, the voltage value of V2 is close to the preset value (e.g. 30V), and if it is detected that V1 or V2 is less than 5V (for reliable determination, the comparison value is reduced to 5V), it is determined that the first relay K1 or the second relay K2 is stuck. In the mode, the impedance element Z9 is introduced between the input L and the output N, so that the impedance network of the system is changed, and compared with the existing N line to ground voltage which is close to 0V (V2 is close to 0V), stable and reasonable comparison voltage is obtained, whether the first relay K1 and the second relay K2 are adhered or not is accurately detected according to the comparison voltage, and the detection and judgment precision is greatly improved. In this embodiment, Z9 is a capacitor. In other embodiments, Z9 may be a combination of resistance, resistance/capacitance.
In the above embodiments, the equivalent schematic diagrams of the impedance elements Z1-Z11 are shown, and in specific implementation, they may be one or a combination of more.
Foretell alternating-current charging stake's relay detection circuitry for detect relay contact adhesion. This alternating-current charging stake disposes suggestion module (if, LED pilot lamp), and this suggestion module electric connection MCU processing module if detect out when taking place the adhesion, sends the suggestion through the suggestion module and shows the information.
The above embodiments are merely illustrative of the technical concepts and features of the present application, and the purpose of the embodiments is to enable those skilled in the art to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the present application are intended to be covered by the scope of the present application.
Claims (5)
1. The utility model provides a relay detection circuitry of alternating-current charging stake which characterized in that includes:
a first relay K1 disposed on the L line, wherein a first end of the first relay K1 is electrically connected to a first sampling point of the L line, a second end of the first relay K1 is electrically connected to a second sampling point of the L line,
a second relay K2 disposed on the N line, wherein a first end of the second relay K2 is electrically connected to a third sampling point of the N line, a second end of the second relay K2 is electrically connected to a fourth sampling point of the N line,
a ninth impedance element Z9, one end of which is electrically connected to the fourth sampling point D and the other end of which is electrically connected to the first sampling point a;
and the MCU processing module is electrically connected with the first sampling point, the second sampling point, the third sampling point and the fourth sampling point through the voltage division sampling circuit respectively so as to acquire voltage information of the first sampling point, the second sampling point, the third sampling point and the fourth sampling point, and judges the states of the first relay K1 and the second relay K2 based on the acquired voltage information.
2. The relay detection circuit of an ac charging pile according to claim 1, wherein the voltage division sampling circuit includes:
one end of the sixth impedance element Z6 is electrically connected to the first sampling point a of the L-line, the other end is electrically connected to the MCU processing module and one end of the first impedance element Z1, the other end of the first impedance element Z1 is electrically grounded,
one end of the seventh impedance element Z7 is electrically connected to the second sampling point B of the L-line, the other end is electrically connected to the MCU processing module and one end of the second impedance Z2, the other end of the second impedance Z2 is electrically grounded,
a first relay K1 disposed between the first sampling point A and the second sampling point B,
one end of the fifth impedance element Z5 is electrically connected to the third sampling point C of the N line, the other end is electrically connected to the MCU processing module and one end of the third impedance element Z3, the other end of the third impedance element Z3 is electrically grounded,
one end of the eighth impedance element Z8 is electrically connected to the fourth sampling point D of the N line, the other end is electrically connected to the MCU processing module and one end of the fourth impedance element Z4, the other end of the fourth impedance element Z4 is electrically grounded, the second relay K2 is disposed between the third sampling point C and the fourth sampling point D,
one end of the tenth impedance element Z10 is electrically connected to the fourth sampling point D, and the other end is electrically connected to the ground GND,
one end of the eleventh impedance element Z11 is electrically connected to the second sampling point B, and the other end is electrically grounded to GND.
3. The relay detection circuit of the ac charging pile according to claim 1, wherein the ninth impedance element Z9 is a capacitor.
4. The relay detection circuit of an ac charging post according to claim 1, wherein said ninth impedance element Z9 is a combination of a capacitor and a resistor.
5. The relay detection circuit of the alternating-current charging pile according to claim 1, wherein the alternating-current charging pile is provided with a prompting module, and the prompting module is electrically connected with the MCU processing module and receives an instruction action of the MCU processing module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120301061.7U CN214539917U (en) | 2021-02-02 | 2021-02-02 | Relay detection circuit of alternating-current charging pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120301061.7U CN214539917U (en) | 2021-02-02 | 2021-02-02 | Relay detection circuit of alternating-current charging pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900019A (en) * | 2021-11-02 | 2022-01-07 | 浙江广为电器工具有限公司 | Charging pile relay bonding detection circuit and method |
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2021
- 2021-02-02 CN CN202120301061.7U patent/CN214539917U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113900019A (en) * | 2021-11-02 | 2022-01-07 | 浙江广为电器工具有限公司 | Charging pile relay bonding detection circuit and method |
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