CN212781125U - Adhesion fault detection system and alternating-current charging stake of relay - Google Patents
Adhesion fault detection system and alternating-current charging stake of relay Download PDFInfo
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- CN212781125U CN212781125U CN202021422039.XU CN202021422039U CN212781125U CN 212781125 U CN212781125 U CN 212781125U CN 202021422039 U CN202021422039 U CN 202021422039U CN 212781125 U CN212781125 U CN 212781125U
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Abstract
The application discloses an adhesion fault detection system of a relay and an alternating-current charging pile, wherein the adhesion fault detection system of the relay detects the voltage value of a first end and the voltage value of a second end of a break contact of the relay through a voltage detection module, judges whether the relay has an adhesion fault according to the voltage value of the first end and/or the voltage value of the second end after sending a turn-off instruction of an electric signal form to the relay through an electric signal generation module, controls a leakage current generation module to generate leakage current and transmit the leakage current to a protection module after judging that the relay has the adhesion fault, so that the protection module cuts off a connecting channel of an external power supply and a load, and realizes the purpose of cutting off the connecting channel of the external power supply and the load when the relay has the adhesion fault on the basis of realizing the detection of the adhesion fault of the relay of the alternating-current charging pile, the use safety of alternating-current charging stake is improved.
Description
Technical Field
The application relates to the technical field of circuit design, more specifically to an adhesion fault detection system and alternating-current charging stake of relay.
Background
For high-power and high-current electric equipment such as an alternating-current charging pile, a relay is an important device for realizing the turn-off or turn-on of the alternating-current charging pile and also an important device for protecting the use safety of the alternating-current charging pile.
But in the in-service use in-process discovery, in case the adhesion trouble takes place for the relay among the alternating-current charging stake, alternating-current charging stake can't discern this trouble, also can't break off alternating-current charging stake's output path, if there is the user this moment under the condition that does not have insulation protection measure, the exposed Pin needle pole that contacts alternating-current charging stake's the rifle end that charges easily takes place the incident of electrocuteeing.
Therefore, it is necessary to provide an adhesion fault detection system for a relay to improve the safety of the ac charging pile.
SUMMERY OF THE UTILITY MODEL
For solving above-mentioned technical problem, this application provides an adhesion fault detection system and alternating-current charging stake of relay to the realization is to the detection of the adhesion fault of alternating-current charging stake's relay and the purpose of cutting off the connecting channel of external power source and load when the adhesion fault appears in the relay.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
the utility model provides an adhesion fault detection system of relay for whether adhesion trouble appears in the relay that detects alternating-current charging stake, the relay includes the break contact, external power supply is connected to the first end of break contact, the second end of break contact is used for connecting the load, the adhesion fault detection system of relay includes: the device comprises a voltage detection module, an electric signal generation module, a leakage current generation module and a protection module; wherein the content of the first and second substances,
the voltage detection module comprises two detection ends which are respectively electrically connected with the first end and the second end, and is used for detecting the voltage value of the first end and the voltage value of the second end and transmitting the voltage value of the first end and the voltage value of the second end to the electric signal generation module;
the receiving end of the electric signal generating module is electrically connected with the output end of the voltage detecting module, the electric signal generating module is used for judging whether the relay has adhesion faults or not according to the voltage value of the first end and/or the voltage value of the second end after sending a turn-off instruction in the form of an electric signal to the relay, and if yes, the leakage current generating module is controlled to generate leakage current and transmit the leakage current to the protection module;
the protection module is connected to a connecting path between an external power supply and a load and used for cutting off the connecting path between the external power supply and the load after receiving the leakage current.
Optionally, the electrical signal generating module determines whether the relay has the adhesion fault according to the voltage value of the first end and/or the voltage value of the second end, and determines that the relay has the adhesion fault when the voltage value of the first end is equal to the voltage value of the second end or when the voltage value of the second end is greater than a preset voltage value.
Optionally, the protection module comprises an air switch;
the air switch comprises a first connecting end, a second connecting end and a third connecting end; the first connecting end, the second connecting end and the third connecting end are used for being respectively connected with a zero line, a live line and a ground line of a connecting channel of the external power supply and the load when the air switch does not receive the leakage current, and the air switch is disconnected from the zero line, the live line and the ground line when receiving the leakage current.
Optionally, the leakage current generating module includes: an enabling unit, a switching unit and a current generating unit; wherein the content of the first and second substances,
the control end of the enabling unit is connected with the electric signal generating module, the first end of the enabling unit is connected with the first end of the switch unit, and the second end of the enabling unit is grounded;
the second end of the switch unit is used for receiving a first working voltage, and the output end of the switch unit is coupled with the control end of the current generation unit;
the first end of the current generating unit is used for receiving a second working voltage, and the second end of the current generating unit is grounded;
the control end of the enabling unit is conducted after receiving a first enabling signal of the electric signal generating module, so that the switch unit works by utilizing the first working voltage;
the switch unit is used for generating a second enabling signal during working and transmitting the second enabling signal to the control end of the current generating unit through the output end of the switch unit;
and after receiving the second enabling signal, the current generating unit works by using the second working voltage to generate the leakage current to be transmitted to a zero line or a live line of a connecting channel of the external power supply and the load.
Optionally, the enabling unit includes a first transistor;
the control end of the first transistor is electrically connected with the control end of the enabling unit and the electric signal generating module;
a first terminal of the first transistor is used as a first terminal of the enabling unit and is connected with a first terminal of the switch unit;
the second terminal of the first transistor is grounded as the second terminal of the enable unit.
Optionally, the enabling unit further includes a protection unit;
the protection unit comprises a first resistor and a second resistor; the first resistor is connected between the control end of the first transistor and the control end of the enabling unit in series;
one end of the second resistor is electrically connected with the control end of the first transistor, and the other end of the second resistor is connected with the second end of the first transistor.
Optionally, the switch unit includes: the first capacitor, the first diode and the input coil; wherein the content of the first and second substances,
one end of the first capacitor is connected with the negative electrode of the first diode and one end of the input coil to serve as a second end of the switch unit, and the other end of the first capacitor is grounded;
one end of the first diode, which is far away from the first capacitor, is connected with one end of the input coil, which is far away from the first capacitor, and the end of the first diode is used as a first end of the switch unit;
the input coil is used as the output end of the switch unit and is coupled with the control end of the current generation unit.
Optionally, the current generating unit includes: a first switch contact and a resistance unit; wherein the content of the first and second substances,
the first switch contact is used as a control end of the current generation unit and coupled with an output end of the switch unit, one end of the first switch contact is used as a first end of the current generation unit and used for receiving the second working voltage, and the other end of the first switch contact is connected with one end of the resistance unit;
one end of the resistance unit, which is far away from the first switch contact, is used as a second end of the current generation unit to be grounded;
the resistance unit comprises a plurality of third resistors which are sequentially connected in series.
An AC charging post comprising: a relay and an adhesion fault detection system for a relay as claimed in any one of the above; wherein the content of the first and second substances,
the relay comprises a break contact, the first end of the break contact is connected with an external power supply, and the second end of the break contact is used for connecting a load.
The method for detecting the adhesion fault of the relay is used for detecting whether the adhesion fault occurs in the relay of the alternating current charging pile, the relay comprises a dynamic break contact, a first end of the dynamic break contact is connected with an external power supply, and a second end of the dynamic break contact is used for being connected with a load; the adhesion fault detection method of the relay comprises the following steps:
acquiring a voltage value of the first end and a voltage value of the second end;
after a turn-off instruction in the form of an electric signal is sent to the relay, whether the relay has an adhesion fault or not is judged according to the voltage value of the first end and/or the voltage value of the second end, if yes, a leakage current is generated and transmitted to a protection module, and therefore the connection path between the external power supply and a load is cut off after the protection module receives the leakage current.
It can be seen from the above technical solutions that, the adhesion fault detection system of a relay and an ac charging pile are provided in the embodiments of the present application, wherein the adhesion fault detection system of the relay detects a voltage value of a first end and a voltage value of a second end of a break contact of the relay through a voltage detection module, determines whether an adhesion fault occurs in the relay according to the voltage value of the first end and/or the voltage value of the second end after an electrical signal generation module sends a turn-off instruction in the form of an electrical signal to the relay, and controls a leakage current generation module to generate a leakage current and transmit the leakage current to a protection module after it is determined that the adhesion fault occurs in the relay, so that the protection module cuts off a connection path between an external power supply and a load, on the basis of detecting the adhesion fault of the relay of the ac charging pile, the purpose of cutting off the connection path between an external power supply and a load when the relay is in adhesion fault is achieved, and the use safety of the alternating-current charging pile is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an adhesion fault detection system of a relay according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a sticking fault detection system of a relay according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a leakage current generating module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a leakage current generating module according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of a leakage current generating module according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a leakage current generating module according to yet another embodiment of the present application;
fig. 7 is a schematic structural diagram of a leakage current generating module according to an alternative embodiment of the present application.
Detailed Description
Just as the background art said, the alternating-current charging stake among the prior art does not have the detection function of relay adhesion trouble, also does not have the counter-measure after the relay adhesion trouble appears, this makes relay among the alternating-current charging stake in case the adhesion trouble appears, just very easily leads to the power consumption incident.
The adhesion fault of the relay refers to a fault that a break contact of the relay cannot be disconnected or cannot be disconnected in time after a Micro Control Unit (MCU) (or other controllers) of the ac charging pile sends a disconnection command to the relay without a charging requirement, or is called an adhesion fault of the relay when the on-off state of the relay cannot be controlled in an electrical manner. The relay adhesion can lead to the route between alternating-current charging stake's external power supply and the load to be in the on-state always, and if the user contacts alternating-current charging stake's the rifle that charges at the condition that does not have insulation protection this moment, the electric shock accident just very easily appears.
In order to solve this problem, there is a solution provided by researchers in which the researchers replace a general relay of an ac charging post with a relay having a signal communication function, and when the relay has an adhesion fault, an external air switch is turned off by a change of a contact pin signal inside the relay, thereby turning off the entire circuit. However, the relay with the signal communication function is usually expensive, and the cost of the alternating-current charging pile can be greatly improved.
In view of this, the embodiment of the present application provides an adhesion fault detection system for a relay for detecting whether an adhesion fault occurs in a relay of an ac charging pile, where the relay includes a break contact, a first end of the break contact is connected to an external power supply, a second end of the break contact is used for connecting a load, and the adhesion fault detection system for a relay includes: the device comprises a voltage detection module, an electric signal generation module, a leakage current generation module and a protection module; wherein the content of the first and second substances,
the voltage detection module comprises two detection ends which are respectively electrically connected with the first end and the second end, and is used for detecting the voltage value of the first end and the voltage value of the second end and transmitting the voltage value of the first end and the voltage value of the second end to the electric signal generation module;
the receiving end of the electric signal generating module is electrically connected with the output end of the voltage detecting module, the electric signal generating module is used for judging whether the relay has adhesion faults or not according to the voltage value of the first end and/or the voltage value of the second end after sending a turn-off instruction in the form of an electric signal to the relay, and if yes, the leakage current generating module is controlled to generate leakage current and transmit the leakage current to the protection module;
the protection module is connected to a connecting path between an external power supply and a load and used for cutting off the connecting path between the external power supply and the load after receiving the leakage current.
The adhesion fault detection system of the relay detects the voltage value of the first end and the voltage value of the second end of the break contact of the relay through the voltage detection module, after an electric signal generating module sends a turn-off command in the form of an electric signal to the relay, judging whether the relay has adhesion fault according to the voltage value of the first end and/or the voltage value of the second end, and after the relay is judged to have adhesion fault, the leakage current generation module is controlled to generate leakage current and transmit the leakage current to the protection module so as to enable the protection module to cut off a connecting path between the external power supply and the load, on the basis of the realization to the detection of the adhesion trouble of alternating-current charging stake's relay, realize cutting off the purpose of the connecting channel of external power source and load when the adhesion trouble appears in the relay, improve alternating-current charging stake's safety in utilization.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The embodiment of the application provides an adhesion fault detection system of relay, as shown in fig. 1 for whether adhesion trouble appears in the relay that detects alternating-current charging stake, the relay is including break contact K1, external power supply 400 is connected to break contact K1's first end, break contact K1's second end is used for connecting load 500, the adhesion fault detection system of relay includes: the protection circuit comprises a voltage detection module 100, an electric signal generation module, a leakage current generation module 200 and a protection module 300; wherein the content of the first and second substances,
the voltage detection module 100 includes two detection terminals, the two detection terminals are electrically connected to the first terminal and the second terminal respectively, and the voltage detection module 100 is configured to detect a voltage value of the first terminal and a voltage value of the second terminal, and transmit the voltage value of the first terminal and the voltage value of the second terminal to the electrical signal generation module;
the receiving end of the electric signal generating module is electrically connected with the output end of the voltage detecting module, the electric signal generating module is used for judging whether the relay has adhesion fault according to the voltage value of the first end and/or the voltage value of the second end after sending a turn-off instruction in the form of an electric signal to the relay, and if so, the leakage current generating module 200 is controlled to generate leakage current and transmit the leakage current to the protection module 300;
the protection module 300 is connected to a connection path between an external power source and a load, and is configured to cut off the connection path between the external power source and the load 500 after receiving the leakage current.
In fig. 1, the dynamic break contact K1 of the relay is arranged on the live wire, and in addition to the dynamic break contact K1 of the relay, in order to ensure safe use in all aspects, the neutral wire usually needs to be provided with a dynamic break contact K2 of the relay to realize the control of cutting off or conducting the neutral wire.
In this embodiment, the adhesion fault detection system of the relay detects a voltage value of a first end and a voltage value of a second end of a trip contact K1 of the relay through a voltage detection module 100, determines whether the relay has an adhesion fault according to the voltage value of the first end and/or the voltage value of the second end after sending a turn-off instruction in the form of an electrical signal to the relay through an electrical signal generation module, and controls the leakage current generation module 200 to generate a leakage current and transmit the leakage current to the protection module 300 after determining that the relay has the adhesion fault, so that the protection module 300 cuts off a connection path between the external power supply and a load 500, and on the basis of detecting the adhesion fault of the relay of the ac charging pile, the purpose of cutting off the connection path between the external power supply and the load 500 when the relay has the adhesion fault is realized, the use safety of alternating-current charging stake is improved.
The electric signal generating module can comprise a single chip microcomputer or a micro control unit or other integrated circuit structures, and the judgment of the voltage value of the first end and/or the voltage value of the second end by the electric signal generating module can be realized based on rich control logic built in the single chip microcomputer.
On the basis of the above embodiment, in an embodiment of the present application, the electrical signal generation module determines whether the relay has the adhesion fault according to the voltage value of the first end and/or the voltage value of the second end, specifically, when the voltage value of the first end is equal to the voltage value of the second end or when the voltage value of the second end is greater than a preset voltage value, it is determined that the relay has the adhesion fault.
In this embodiment, a specific method for determining whether the relay has the adhesion fault is provided, that is, after the electrical signal generating module sends the turn-off instruction in the form of the electrical signal to the relay, when the relay does not have the adhesion fault, the dynamic disconnection contact K1 should be disconnected, at this time, the voltage value of the first end should be equal to the voltage value of the external power supply 400, and the voltage value of the second end should be zero or close to zero. That is, the voltage value of the first terminal should be different from the voltage value of the second terminal, and if the voltage value of the first terminal is equal to the voltage value of the second terminal, the movable contact K1 of the relay is not opened, and an adhesion fault occurs.
Similarly, since the voltage value of the second terminal should be zero or approach to zero when the snap contact K1 of the relay is opened, after the electrical signal generating module sends a turn-off command in the form of an electrical signal to the relay, if the voltage value of the second terminal is still higher than the preset voltage value, it can be considered that the relay has a sticking fault.
The value of the preset voltage value may be any value greater than or equal to 0, and in order to ensure the safety of the use of the alternating-current charging pile, the value of the preset voltage value should not be greater than 36V, and in an optional embodiment of the present application, the value of the preset voltage value is 36V.
A possible structure of each component of the sticking failure detection system of the relay is described below.
On the basis of the above-mentioned embodiments, in another embodiment of the present application, as shown in fig. 2, the protection module 300 includes an air switch 310;
the air switch 310 includes a first connection terminal, a second connection terminal, and a third connection terminal; the first connection end, the second connection end and the third connection end are used for being respectively connected with a zero line, a live line and a ground line of a connection channel of the external power supply 400 and the load 500 when the air switch 310 does not receive the leakage current, and the connection with the zero line, the live line and the ground line is disconnected when the air switch 310 receives the leakage current.
One end of the first connection end, the second connection end and the third connection end of the air switch 310 can be disconnected with the hook of the overcurrent unhooking device through the chain, the other ends of the first connecting end, the second connecting end and the third connecting end are connected with the fixed end through springs, the over-current detacher of the air switch 310 detects the current of the neutral wire and the current of the live wire of the connection channel of the external power supply 400 and the load 500, when an overcurrent or short circuit condition occurs, the current of the zero line and the current of the live line of the connecting channel of the load 500 are not equal, at the moment, the hook of the overcurrent unhooking device is disconnected with the chain, and the springs connected with the first connecting end, the second connecting end and the third connecting end disconnect the first connecting end, the second connecting end and the third connecting end from the zero line, the live line and the ground wire, so that the disconnection of the path is realized.
In fig. 2, when the leakage current generating module 200 generates leakage current and transmits the leakage current to the protection module 300, since the energy on the live line and the neutral line detected by the protection module 300 is not conserved, the leakage protection action is triggered, and the air switch 310 is triggered, that is, the connection path between the external power supply and the load 500 is cut off, so as to achieve the protection purpose.
On the basis of the above embodiment, in another embodiment of the present application, as shown in fig. 3, the leakage current generating module 200 includes: an enable unit 220, a switching unit 210, and a current generation unit 230; wherein the content of the first and second substances,
the control end of the enabling unit 220 is connected to the electrical signal generating module, the first end of the enabling unit 220 is connected to the first end of the switching unit 210, and the second end of the enabling unit 220 is grounded;
a second terminal of the switching unit 210 is configured to receive a first operating voltage, and an output terminal of the switching unit 210 is coupled to a control terminal of the current generating unit 230;
a first end of the current generating unit 230 is configured to receive a second operating voltage, and a second end of the current generating unit 230 is grounded;
the control terminal of the enabling unit 220 is turned on after receiving the first enabling signal of the electrical signal generating module, so that the switching unit 210 operates by using the first operating voltage;
the switching unit 210 is configured to generate a second enable signal during operation, and transmit the second enable signal to the control terminal of the current generating unit 230 through the output terminal of the switching unit 210;
after receiving the second enable signal, the current generating unit 230 operates using the second operating voltage to generate the leakage current to be transmitted to the zero line or the live line of the connection channel between the external power supply 400 and the load 500.
Referring to fig. 4, the enable unit 220 includes a first transistor Q1;
a control terminal of the first transistor Q1 is electrically connected with a control terminal of the enable unit 220 and the electric signal generating module;
a first terminal of the first transistor Q1 is connected to the first terminal of the switching unit 210 as a first terminal of the enabling unit 220;
a second terminal of the first transistor Q1 is grounded as a second terminal of the enable unit 220.
Optionally, the first Transistor Q1 may be a Field Effect Transistor (FET) or a P-type FET, and when the first Transistor Q1 is an N-type FET, the first enable signal is a high level signal; when the first transistor Q1 is a P-type field effect transistor, the first enable signal is a low level signal.
Still referring to fig. 4, the enabling unit 220 further includes a protecting unit;
the protection unit comprises a first resistor R1 and a second resistor R2; the first resistor R1 is connected in series between the control terminal of the first transistor Q1 and the control terminal of the enable unit 220;
one end of the second resistor R2 is electrically connected to the control terminal of the first transistor Q1, and the other end is connected to the second terminal of the first transistor Q1.
The first resistor R1 and the second resistor R2 are used to protect the control terminal of the first transistor Q1 and the second terminal of the first transistor Q1, and prevent the control terminal of the first transistor Q1 from being damaged by an excessively high voltage signal. In addition, the first resistor R1 and the second resistor R2 are also used for biasing the first transistor Q1 in a correct working region, for example, when the first transistor Q1 receives a first enable signal, the first resistor R1 and the second resistor R2 bias the first transistor Q1 in a saturation region, so that the first transistor Q1 is in a conducting state; when the first transistor Q1 does not receive a first enable signal, the first resistor R1 and the second resistor R2 bias the first transistor Q1 in a cut-off region to place the first transistor Q1 in an off state.
Referring to fig. 5, the switching unit 210 includes: a first capacitor C1, a first diode D1, and an input coil L1; wherein the content of the first and second substances,
one end of the first capacitor C1 is connected to the cathode of the first diode D1 and one end of the input coil L1 as the second end of the switch unit 210, and the other end of the first capacitor C1 is grounded;
one end of the first diode D1, which is far from the first capacitor C1, is connected with one end of the input coil L1, which is far from the first capacitor C1, as a first end of the switching unit 210;
the input coil L1 serves as an output terminal of the switching unit 210 and is coupled to a control terminal of the current generating unit 230.
The first diode D1 is used for preventing current from flowing backwards;
the first capacitor C1 is used to store the power, and when the first transistor Q1 is turned on, the power stored in the first capacitor C1 passes through the input coil L1, so that the input coil L1 generates a changing magnetic field.
Referring to fig. 6, the current generation unit 230 includes: a first switch contact K3 and a resistance unit 231; wherein the content of the first and second substances,
the first switch contact K3 is coupled to the output terminal of the switch unit 210 as the control terminal of the current generating unit 230, one end of the first switch contact is used as the first terminal of the current generating unit 230 for receiving the second operating voltage, and the other end of the first switch contact is connected to one end of the resistor unit 231;
one end of the resistance unit 231, which is far away from the first switch contact K3, is grounded as a second end of the current generating unit 230;
referring to fig. 7, the resistance unit 231 includes a plurality of third resistors R3 connected in series.
CTRL in fig. 6 and 7 denotes a control terminal of the enable unit, and LIN denotes a first terminal of the current generation unit 230.
In the current generating unit 230 shown in fig. 7, the first switch contact is configured to induce a changing magnetic field generated by the input coil L1 to generate a current after the changing magnetic field is induced, so that the first switch contact is closed, so that the second operating voltage and the resistance unit 231 form a path, and the second operating voltage is applied to the resistance unit 231 to form the leakage current.
Correspondingly, this application embodiment still provides an alternating-current charging stake, includes: a relay and a sticking fault detection system for a relay as in any of the above embodiments, wherein,
the relay comprises a break contact, the first end of the break contact is connected with an external power supply, and the second end of the break contact is used for connecting a load.
Correspondingly, the embodiment of the application also provides an adhesion fault detection method of the relay, which is used for detecting whether the adhesion fault occurs in the relay of the alternating-current charging pile, wherein the relay comprises a break contact, the first end of the break contact is connected with an external power supply, and the second end of the break contact is used for connecting a load; the adhesion fault detection method of the relay comprises the following steps:
s101: acquiring a voltage value of the first end and a voltage value of the second end;
s102: after a turn-off instruction in the form of an electric signal is sent to the relay, whether the relay has an adhesion fault or not is judged according to the voltage value of the first end and/or the voltage value of the second end, if yes, a leakage current is generated and transmitted to a protection module, and therefore the connection path between the external power supply and a load is cut off after the protection module receives the leakage current.
To sum up, the embodiment of the present application provides an adhesion fault detection system of a relay and an ac charging pile, wherein the adhesion fault detection system of the relay detects a voltage value of a first end of a break contact of the relay and a voltage value of a second end through a voltage detection module, judges whether the relay has an adhesion fault according to the voltage value of the first end and/or the voltage value of the second end after sending a turn-off instruction in an electric signal form to the relay through an electric signal generation module, and controls the leakage current generation module to generate leakage current and transmit the leakage current to the protection module after judging that the relay has the adhesion fault, so that the protection module cuts off a connection path between an external power supply and a load, and on the basis of realizing the detection of the adhesion fault of the relay of the ac charging pile, the purpose of cutting off the connection path between the external power supply and the load when the adhesion fault occurs in the relay is realized, the use safety of alternating-current charging stake is improved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The utility model provides an adhesion fault detection system of relay for whether adhesion trouble appears in the relay that detects alternating-current charging stake, the relay includes the break contact, external power supply is connected to the first end of break contact, the second end of break contact is used for connecting the load, the adhesion fault detection system of relay includes: the device comprises a voltage detection module, an electric signal generation module, a leakage current generation module and a protection module; wherein the content of the first and second substances,
the voltage detection module comprises two detection ends which are respectively electrically connected with the first end and the second end, and is used for detecting the voltage value of the first end and the voltage value of the second end and transmitting the voltage value of the first end and the voltage value of the second end to the electric signal generation module;
the receiving end of the electric signal generating module is electrically connected with the output end of the voltage detecting module, the electric signal generating module is used for judging whether the relay has adhesion faults or not according to the voltage value of the first end and/or the voltage value of the second end after sending a turn-off instruction in the form of an electric signal to the relay, and if yes, the leakage current generating module is controlled to generate leakage current and transmit the leakage current to the protection module;
the protection module is connected to a connecting path between an external power supply and a load and used for cutting off the connecting path between the external power supply and the load after receiving the leakage current.
2. The system for detecting the sticking fault of the relay according to claim 1, wherein the electrical signal generating module determines whether the sticking fault occurs in the relay according to the voltage value of the first end and/or the voltage value of the second end, and is specifically configured to determine that the sticking fault occurs in the relay when the voltage value of the first end is equal to the voltage value of the second end or when the voltage value of the second end is greater than a preset voltage value.
3. The sticking fault detection system of a relay of claim 1, wherein the protection module comprises an air switch;
the air switch comprises a first connecting end, a second connecting end and a third connecting end; the first connecting end, the second connecting end and the third connecting end are used for being respectively connected with a zero line, a live line and a ground line of a connecting channel of the external power supply and the load when the air switch does not receive the leakage current, and the air switch is disconnected from the zero line, the live line and the ground line when receiving the leakage current.
4. The sticking fault detection system of a relay according to claim 3, wherein said leakage current generation module comprises: an enabling unit, a switching unit and a current generating unit; wherein the content of the first and second substances,
the control end of the enabling unit is connected with the electric signal generating module, the first end of the enabling unit is connected with the first end of the switch unit, and the second end of the enabling unit is grounded;
the second end of the switch unit is used for receiving a first working voltage, and the output end of the switch unit is coupled with the control end of the current generation unit;
the first end of the current generating unit is used for receiving a second working voltage, and the second end of the current generating unit is grounded;
the control end of the enabling unit is conducted after receiving a first enabling signal of the electric signal generating module, so that the switch unit works by utilizing the first working voltage;
the switch unit is used for generating a second enabling signal during working and transmitting the second enabling signal to the control end of the current generating unit through the output end of the switch unit;
and after receiving the second enabling signal, the current generating unit works by using the second working voltage to generate the leakage current to be transmitted to a zero line or a live line of a connecting channel of the external power supply and the load.
5. The sticking fault detection system of a relay according to claim 4, wherein the enabling unit includes a first transistor;
the control end of the first transistor is electrically connected with the control end of the enabling unit and the electric signal generating module;
a first terminal of the first transistor is used as a first terminal of the enabling unit and is connected with a first terminal of the switch unit;
the second terminal of the first transistor is grounded as the second terminal of the enable unit.
6. The sticking fault detection system of a relay according to claim 5, wherein the enabling unit further comprises a protection unit;
the protection unit comprises a first resistor and a second resistor; the first resistor is connected between the control end of the first transistor and the control end of the enabling unit in series;
one end of the second resistor is electrically connected with the control end of the first transistor, and the other end of the second resistor is connected with the second end of the first transistor.
7. The sticking fault detection system of a relay according to claim 4, wherein the switch unit includes: the first capacitor, the first diode and the input coil; wherein the content of the first and second substances,
one end of the first capacitor is connected with the negative electrode of the first diode and one end of the input coil to serve as a second end of the switch unit, and the other end of the first capacitor is grounded;
one end of the first diode, which is far away from the first capacitor, is connected with one end of the input coil, which is far away from the first capacitor, and the end of the first diode is used as a first end of the switch unit;
the input coil is used as the output end of the switch unit and is coupled with the control end of the current generation unit.
8. The sticking fault detecting system of a relay according to claim 4, wherein the current generating unit includes: a first switch contact and a resistance unit; wherein the content of the first and second substances,
the first switch contact is used as a control end of the current generation unit and coupled with an output end of the switch unit, one end of the first switch contact is used as a first end of the current generation unit and used for receiving the second working voltage, and the other end of the first switch contact is connected with one end of the resistance unit;
one end of the resistance unit, which is far away from the first switch contact, is used as a second end of the current generation unit to be grounded;
the resistance unit comprises a plurality of third resistors which are sequentially connected in series.
9. An alternating current charging pile, comprising: a sticking fault detection system for a relay and a relay according to any of claims 1-8; wherein the content of the first and second substances,
the relay comprises a break contact, the first end of the break contact is connected with an external power supply, and the second end of the break contact is used for connecting a load.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021422039.XU CN212781125U (en) | 2020-07-17 | 2020-07-17 | Adhesion fault detection system and alternating-current charging stake of relay |
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| CN202021422039.XU CN212781125U (en) | 2020-07-17 | 2020-07-17 | Adhesion fault detection system and alternating-current charging stake of relay |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200297A (en) * | 2021-12-14 | 2022-03-18 | 睿信汽车电器（荆州）有限公司 | Switch contact adhesion sensitivity quantitative measurement system and method |
| CN117250495A (en) * | 2023-11-16 | 2023-12-19 | 广州三晶电气股份有限公司 | Key adhesion detection device |
| CN117250497A (en) * | 2023-11-20 | 2023-12-19 | 苏州联讯仪器股份有限公司 | Relay self-checking circuit and power supply equipment |
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2020
- 2020-07-17 CN CN202021422039.XU patent/CN212781125U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200297A (en) * | 2021-12-14 | 2022-03-18 | 睿信汽车电器（荆州）有限公司 | Switch contact adhesion sensitivity quantitative measurement system and method |
| CN114200297B (en) * | 2021-12-14 | 2024-06-04 | 湖北睿信汽车电器股份有限公司 | Quantitative measurement system and method for adhesion sensitivity of switch contact |
| CN117250495A (en) * | 2023-11-16 | 2023-12-19 | 广州三晶电气股份有限公司 | Key adhesion detection device |
| CN117250495B (en) * | 2023-11-16 | 2024-04-26 | 广州三晶电气股份有限公司 | Key adhesion detection device |
| CN117250497A (en) * | 2023-11-20 | 2023-12-19 | 苏州联讯仪器股份有限公司 | Relay self-checking circuit and power supply equipment |
| CN117250497B (en) * | 2023-11-20 | 2024-04-09 | 苏州联讯仪器股份有限公司 | Relay self-checking circuit and power supply equipment |
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