CN213425778U - Charging control system for electric vehicle charging device - Google Patents
Charging control system for electric vehicle charging device Download PDFInfo
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- CN213425778U CN213425778U CN202021636060.XU CN202021636060U CN213425778U CN 213425778 U CN213425778 U CN 213425778U CN 202021636060 U CN202021636060 U CN 202021636060U CN 213425778 U CN213425778 U CN 213425778U
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Abstract
The utility model provides a charging control system for electric automobile charging device. The charge control system includes: a relay; the temperature sensor is used for detecting and acquiring temperature data of the relay control element; the current transformer is coupled with the relay and modulates the load current of the relay to generate a load current signal; a processing circuit coupled to the relay, the temperature sensor, and the current transformer, the processing circuit comprising: the temperature management module and/or the temperature gradient management module respectively receive the temperature data of the relay control element, adjust the temperature protection threshold value and/or the temperature change gradient threshold value according to the load current signal, and send a control signal to disconnect the relay when the temperature data exceeds the temperature protection threshold value and/or the temperature change gradient threshold value, so that more accurate over-temperature protection is realized.
Description
Technical Field
The utility model relates to a charge control system especially relates to a charge control system for electric automobile charging device.
Background
In the current charging control and protection of the electric vehicle, the charging protection is usually performed based on a fixed temperature range, that is, if a certain temperature is exceeded in the charging process, a power generation relay is turned off. However, in practical applications, if the charging current is small, the temperature should be generally small, and at the same time, the charging current may be small or normal due to a circuit fault, but the temperature still rapidly rises, and exceeds the temperature during normal charging, but does not exceed the preset temperature range, and the circuit cannot be timely disconnected, which are problems existing in the current charging system.
In order to solve the above-mentioned drawbacks, a need exists in the art to develop a new charging control system to achieve more accurate over-temperature protection.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a charging control system for electric automobile charging device realizes more accurate excess temperature protection to promote the reliability of electric automobile charging device work.
The embodiment of the utility model provides a charge control system is used for electric automobile charging device's charge control system, it includes: a relay; the temperature sensor is used for detecting and acquiring temperature data of the relay control element; the current transformer is coupled with the relay and modulates the load current of the relay to generate a load current signal; a processing circuit coupled to the relay, the temperature sensor, and the current transformer, the processing circuit comprising: the temperature management module and/or the temperature gradient management module respectively receive temperature data of the relay control element, adjust a temperature protection threshold value and/or a temperature change gradient threshold value according to the load current signal, and send a control signal to disconnect the relay when the temperature data exceeds the temperature protection threshold value and/or the temperature change gradient threshold value.
The embodiment of the utility model provides an in, acquire relay control element's temperature data through temperature sensor to adopt temperature management module and/or temperature gradient management module according to load current signal dynamic adjustment temperature protection threshold value and/or temperature variation gradient threshold value, can realize more accurate excess temperature protection based on temperature protection threshold value and/or temperature variation gradient threshold value.
In one exemplary embodiment of a charging control system for an electric vehicle charging device, the charging control system further includes: the driving circuit is respectively coupled with the relay and the processing circuit, the processing circuit receives a request signal for closing or opening the relay and generates a control signal at the zero-crossing point moment of the input voltage of the relay, and the driving circuit receives the control signal sent by the processing circuit and drives the relay to perform closing or opening operation according to the control signal. After the relay is determined to be required to be closed or opened, the processing circuit indicates the driving circuit to be closed or opened at the zero crossing point moment of the input voltage of the relay, so that the situation that large voltage and current flow through the two ends of a contact of the relay is avoided, the contact of the relay is prevented from being damaged, and the service life of the relay is prolonged.
In one exemplary embodiment of the charging control system for an electric vehicle charging device, the relay control element includes at least one of a charging plug terminal, a charging connector, or a charging box.
In one exemplary embodiment of a charge control system for an electric vehicle charging device, the system further comprises: a partial pressure conditioning module; the voltage division conditioning module is respectively connected with the input end and the output end of the relay and the processing circuit, and conditions to generate an input voltage signal and an output voltage signal of the relay; the processing circuit also comprises a relay contact quality monitoring module which receives the input voltage signal and the output voltage signal, determines the difference between the input voltage and the output voltage of the relay according to the input voltage signal and the output voltage signal, and outputs an electric signal representing the quality of the relay contact. Therefore, the potential quality hazard of the contact of the relay can be found in time, and the charging fault caused by poor contact or damage of the contact is avoided.
In one exemplary embodiment of a charge control system for an electric vehicle charging device, the processing circuit includes: the zero crossing point module is connected with the partial pressure conditioning module, receives the input voltage signal and determines the zero crossing point moment of the load voltage; and the delay module is respectively coupled with the zero crossing point module and the driving circuit, and sends the control signal to the driving circuit at the zero crossing point moment of the input voltage, so that the zero crossing point moment is more accurately judged and determined.
In an exemplary embodiment of a charging control system for an electric vehicle charging device, the processing circuit includes a charging power calculating module, the charging power calculating module is respectively coupled to the voltage dividing conditioning module and the driving circuit, obtains a load current passing through the relay, and sends the control signal to the driving circuit according to a comparison result between a charging power determined by at least one of the input voltage and the output voltage and the load current and a preset power threshold. Thereby avoiding circuit problems caused by excessive charging power, and the protection of the charging control system in the above embodiment is more comprehensive compared with a circuit based on only voltage or current.
In one exemplary embodiment of a charge control system for an electric vehicle charging apparatus, the system includes an excitation zero sequence current transformer coupled to an excitation circuit and the relay, respectively; the excitation circuit is respectively coupled with the processing circuit and the zero sequence current transformer and excites the zero sequence current transformer to generate a leakage current signal; correspondingly, the processing circuit further comprises an electric leakage fault management module, and the electric leakage fault type is determined according to the magnitude and the waveform of the leakage current signal sent by the zero sequence current transformer. And realizing efficient fault diagnosis.
In an exemplary embodiment of a charge control system for an electric vehicle charging device, the system further includes a Human Machine Interface (HMI) coupled to the processing circuitry for displaying a state of charge and/or a type of electrical fault. The system with the human-computer interface can meet the actual requirement that a user knows the circuit state in real time, and improves the user experience.
The above features, technical features, advantages and implementations of a charging control system for an electric vehicle charging device will be further described in the following detailed description of preferred embodiments in a clearly understandable manner with reference to the accompanying drawings.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present application. Wherein the content of the first and second substances,
fig. 1 is a schematic view of a charging system architecture for an electric vehicle charging device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another charging control system for an electric vehicle charging device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an example of a charging control system for an electric vehicle charging device according to an embodiment of the present invention.
List of reference numerals:
201: a relay;
202: a drive circuit;
203: a processing circuit;
2031: a temperature management module; 2032: a temperature gradient management module;
2033: a relay contact quality monitoring module; 2034: a zero crossing point module; 2035: a delay module;
2036: a charging power calculation module; 2037: a leakage fault management module;
204: a temperature sensor;
205: a current transformer;
206: a partial pressure conditioning module;
207: an excitation circuit;
208: a zero sequence current transformer;
209: a human-machine interface.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings, wherein the same reference numerals in the drawings denote the same or similar components.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, for simplicity and clarity of understanding, only one of the components having the same structure or function is schematically illustrated or labeled in some of the drawings.
In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate positional relationships between the relevant portions, and do not limit their absolute positions.
In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate their degree of importance, order, and the like.
Fig. 1 is a schematic diagram of a charging system for an electric vehicle charging device according to an embodiment of the present disclosure. In the charge control system, comprising: a relay 201; the temperature sensor 204 is used for detecting and acquiring temperature data of the relay control element; the current transformer 205 is coupled with the relay 201, modulates the load current of the relay 201 and generates a load current signal; a processing circuit 203 coupled to the relay 201, the temperature sensor 204 and the current transformer 205, the processing circuit 203 comprising: a temperature management module 2031 and/or a temperature gradient management module 2032, where the temperature management module 2031 and/or the temperature gradient management module 2032 respectively receive the temperature data of the relay control element, adjust a temperature protection threshold and/or a temperature change gradient threshold according to the load current signal, and send a control signal to turn off the relay 201 when the temperature data exceeds the temperature protection threshold and/or the temperature change gradient threshold.
The temperature management module 2031 and/or the temperature gradient management module 2032 respectively receive the temperature data of the relay control element, calculate the gradient of the temperature data, and adjust the temperature protection threshold and/or the temperature change gradient threshold according to the load current signal, so as to determine whether the received temperature data exceeds the threshold according to the adjusted temperature protection threshold and/or the temperature change gradient threshold.
Specifically, if the temperature changes rapidly, the temperature change gradient threshold is exceeded, even if the temperature threshold is not exceeded, and over-temperature protection is triggered. And, in the case of a small or normal charging current, an over-temperature protection is triggered as long as the temperature exceeds a temperature threshold value related to the current, even if the current temperature is not high.
The embodiment of the utility model provides an in, acquire relay control element's temperature data through temperature sensor to adopt temperature management module and/or temperature gradient management module according to load current signal dynamic adjustment temperature protection threshold value and/or temperature variation gradient threshold value, can realize more accurate excess temperature protection based on temperature protection threshold value and/or temperature variation gradient threshold value.
The processing circuitry may also determine whether the relay needs to be closed or opened from a number of other aspects. It is possible for the relay to be closed in a conventional manner when the charging switch on the electric vehicle side is closed, i.e. the relay is closed. For opening the relay, embodiments of the present invention may determine from a number of aspects.
As shown in fig. 2, a schematic diagram of another charging control system for an electric vehicle charging device according to an embodiment of the present invention is provided. In this schematic diagram, the modules included in the processing circuit 203 are illustrated in the form of dashed boxes.
Optionally, the charging control system further includes: the driving circuit 202, the driving circuit 202 is coupled to the relay 201 and the processing circuit 203 respectively, the processing circuit 203 receives a request signal for closing or opening the relay 201 and generates a control signal at a zero-crossing point of an input voltage of the relay 201, and the driving circuit 202 receives the control signal sent by the processing circuit 203 and drives the relay 201 to perform a closing or opening operation according to the control signal.
In other words, even when it is determined that the relay needs to be closed or opened, the connection state of the relay is not immediately changed in the present embodiment. But with a certain time delay. The specific time delay needs to be determined based on the zero crossings of the load current or the load voltage.
The zero crossing point refers to a time point when a zero point is passed when a sinusoidal load current or a load voltage is switched from a positive half cycle to a negative half cycle in an alternating current system. Obviously, the moments of the zero crossings are many. Thus. The zero-crossing points used in particular as time delays may be a specified number of zero-crossings after the determination that the opening or closing of the relay is required, for example the 1 st or 2 nd zero-crossing after the determination that the opening of the relay is required. The specified number is usually not too large, and it is not so large that protection against an abnormal state in the charging process is not achieved. For example, the specified number is typically no greater than 5.
After the relay is determined to be required to be closed or opened, the processing circuit controls the driving circuit to perform closing or opening operation at the zero crossing point moment of the input voltage of the relay, so that large voltage and current at two ends of a contact of the relay are prevented from flowing through, the contact damage of the relay is avoided, and the service life of the relay is prolonged.
I.e. electrical components that are affected by the relay state (including the connected state or the disconnected state). For example, the relay control element may be at least one of a charging plug terminal, a charging connector, or a charging box.
Optionally, the charging control system further includes a voltage division conditioning module 206, where the voltage division conditioning module 206 is respectively connected to the input end and the output end of the relay 201 and the processing circuit 203, and conditions to generate an input voltage signal and an output voltage signal of the relay 201; correspondingly, the processing circuit 203 further includes a relay contact quality monitoring module 2033 that receives the input voltage signal and the output voltage signal, determines a difference between the input voltage and the output voltage of the relay 201 according to the input voltage signal and the output voltage signal, and outputs an electrical signal that characterizes the quality of the contacts of the relay 201.
Wherein, the smaller the difference between the input voltage and the output voltage of the relay 201 is, the better the contact quality of the relay is. Through the real-time monitoring to the contact quality, can in time discover the contact quality hidden danger of relay, avoid the contact failure or damage the charging fault that brings.
Optionally, in the charging control system, the processing circuit 203 further includes: a zero crossing module 2034 coupled to the voltage dividing and conditioning module 206, wherein the zero crossing module 2034 receives the input voltage signal and determines a zero crossing time of the load voltage; a delay module 2035, coupled to the zero-crossing module 2034 and the driving circuit 202, respectively, and configured to send the control signal to the driving circuit 202 at a zero-crossing time of the input voltage. The zero crossing point moment can be more accurately judged by obtaining the voltage signal of the partial pressure conditioning module.
Optionally, in the charging control system, the processing circuit 203 includes a charging power calculating module 2036, the charging power calculating module 2036 is respectively coupled to the voltage dividing conditioning module 206 and the driving circuit 202, obtains a load current passing through the relay 201, and sends the control signal to the driving circuit 202 according to a comparison result between a charging power determined by at least one of the input voltage and the output voltage and the load current and a preset power threshold, so as to implement an over-power protection based on power monitoring, avoid a circuit problem caused by an excessive charging power, and provide a more comprehensive circuit protection compared to a circuit protection based on only voltage or current.
Optionally, the charging control system further comprises: the zero-sequence current transformer 208, the zero-sequence current transformer 208 is coupled with the relay 201; an excitation circuit 207, respectively coupled to the processing circuit 203 and the zero sequence current transformer 208, for exciting the zero sequence current transformer 208 to generate a leakage current signal; correspondingly, the processing circuit 203 further includes an electrical leakage fault management module 2037, which determines the type of the electrical leakage fault according to the magnitude and the waveform of the leakage current signal sent by the zero-sequence current transformer 208.
Specifically, if the waveform of the generated leakage current signal is an alternating current waveform, it can be considered that a short circuit has occurred; if the frequency of the generated leakage current signal is too high, the control loop in the rectifying circuit is considered to be damaged; if the waveform of the leakage current signal is a half-wave, it can be considered that a failure such as a breakdown of the rectifier has occurred. And the high-efficiency fault diagnosis is realized by modulating and analyzing the magnitude and the waveform of the leakage current signal.
Optionally, the charging control system further comprises a human machine interface 209. The human machine interface 209 is coupled to the processing circuitry 203 for displaying the charging status and/or the type of electrical fault. For example. The human-machine interface 209 may be an indicator lamp, and may display the charging state or the leakage fault type by a different color or a blinking type of the indicator lamp, or may also be a display screen, and may display the charging state or the leakage fault type by a fault code or a fault name on the display screen. The circuit state is indicated through the man-machine interface 209, the actual requirement that a user knows the circuit state in real time is met, and the user experience is improved.
Fig. 3 is a schematic diagram of an example of a charging control system for an electric vehicle charging device according to an embodiment of the present invention. In some embodiments, the circuit shown in fig. 3 may be employed as the driving circuit 202. In some embodiments, a microcontroller may be employed as the processing circuit 203, and an isolated high voltage flyback circuit may be employed as a power supply unit of the charging control system. The temperatures in the charging plug terminal, the charging connector, and the charging box are detected using 3 temperature sensors 204, respectively. The material of the current transformer 205 and the zero sequence current transformer 208 may be nanocrystalline.
In order to realize simpler circuit design, a resistance voltage division mode is adopted as the voltage division conditioning module 206, including input voltage conditioning and output voltage conditioning. The excitation circuit 207 modulates the leakage current of the zero-sequence current transformer 208. The processing circuit 203 detects the magnitude of the leakage signal and the leakage current waveform. When it is determined that the leakage current exceeds the threshold, the processing circuit 203 generates a control signal instructing the relay to be switched off, saves the leakage current value and the leakage current waveform in the flash memory, and can display the fault type at the human-machine interface 209.
In some embodiments, the processing circuit 203 calculates a charging power based on the load current and the input voltage. If the charging power exceeds a specified threshold, the processing circuit 203 will instruct the drive circuit to switch off the relay and display it on the human machine interface 209. Therefore, the circuit problem caused by overlarge charging power is avoided, and the circuit protection based on the charging power is realized.
In some embodiments, the difference between the input and output voltages is calculated using the processing circuit 203. If the difference exceeds a specified threshold, the processing circuit 203 will instruct the drive circuit to switch off the relay and instruct it at the human machine interface 209.
In some embodiments, the processing circuit 203 adjusts the temperature threshold and the temperature rate of change threshold by a change in magnitude of the load current. The processing circuit 203 is employed to obtain the temperature and rate of change of temperature of the various relay control elements. If the temperature and/or rate of change of temperature exceeds a set threshold, the processing circuit 203 will open the relay or reduce the charging load current. Thereby realizing more accurate over-temperature protection.
In some embodiments, in order to obtain a more accurate load current signal, an operational amplifier is used as a low-pass active filter, and gain amplification is performed to condition the load current signal. Specifically, 2 power supplies may be employed to drive the relay to conserve the static power consumption of the relay 201. The start voltage is first applied to the relay and then the hold voltage is applied to the relay. 3 power supply drive control guide circuits are adopted to compensate the voltage drop caused by the triode, so that the stability of the charging control system is improved.
In some embodiments, to achieve accurate Temperature sensing, the Temperature sensor 204 may employ a Negative Temperature Coefficient (NTC) Temperature sensor or a semiconductor Temperature sensor.
In some embodiments, to achieve better indication, the present invention employs a plurality of indicator lights as the human interface 209 to indicate the fault and/or the charging status.
It is to be understood that while the invention has been described in terms of various embodiments, it is not intended that each embodiment includes only a single embodiment, but rather that each embodiment is provided for clarity of description, and that all embodiments may be combined as suitable by one of ordinary skill in the art to form other embodiments that will be apparent to those of ordinary skill in the art.
The above is merely an exemplary embodiment of the present invention, and is not intended to limit the scope of the embodiments of the present invention. Any person skilled in the art should also realize that equivalent changes, modifications and combinations can be made without departing from the spirit and principle of the embodiments of the present invention.
Claims (8)
1. A charging control system for an electric vehicle charging device, comprising:
a relay (201);
the temperature sensor (204) is used for detecting and acquiring temperature data of the relay control element;
the current transformer (205) is coupled with the relay (201) and modulates the load current of the relay (201) to generate a load current signal;
a processing circuit (203), the processing circuit (203) being coupled to the relay (201), the temperature sensor (204) and the current transformer (205), the processing circuit (203) comprising: a temperature management module (2031) and/or a temperature gradient management module (2032), the temperature management module (2031) and/or the temperature gradient management module (2032) respectively receiving temperature data of the relay control element, adjusting a temperature protection threshold and/or a temperature change gradient threshold according to the load current signal, and sending a control signal to turn off the relay (201) when the temperature data exceeds the temperature protection threshold and/or the temperature change gradient threshold.
2. The charge control system of claim 1, further comprising:
the driving circuit (202), the driving circuit (202) is respectively coupled to the relay (201) and the processing circuit (203), the processing circuit (203) receives a request signal for closing or opening the relay (201) and generates a control signal at a zero-crossing point of an input voltage of the relay (201), and the driving circuit (202) receives the control signal sent by the processing circuit (203) and drives the relay (201) to perform a closing or opening operation according to the control signal.
3. The charging control system of claim 1, wherein the relay control element comprises at least one of a charging plug terminal, a charging connector, or a charging box.
4. The charge control system according to claim 2, characterized by comprising:
a voltage division conditioning module (206), wherein the voltage division conditioning module (206) is respectively coupled to the input end and the output end of the relay (201) and the processing circuit (203) and conditions an input voltage signal and an output voltage signal of the relay (201);
the processing circuit (203) comprises: a relay contact quality monitoring module (2033) that receives the input voltage signal and the output voltage signal, determines a difference between the input voltage and the output voltage of the relay (201) based on the input voltage signal and the output voltage signal, and outputs an electrical signal that characterizes the quality of the relay (201) contacts.
5. The charge control system of claim 4, wherein the processing circuit (203) comprises:
a zero crossing point module (2034) connected to the voltage dividing and conditioning module (206), wherein the zero crossing point module (2034) receives the input voltage signal and determines a zero crossing point time of the load voltage; and
a delay module (2035) respectively coupled to the zero-crossing module (2034) and the driving circuit (202), and configured to send the control signal to the driving circuit (202) at a zero-crossing time of the input voltage.
6. The charge control system of claim 4, wherein the processing circuit (203) comprises:
a charging power calculation module (2036), wherein the charging power calculation module (2036) is coupled to the voltage division conditioning module (206) and the driving circuit (202), respectively, obtains a load current passing through the relay (201), and sends the control signal to the driving circuit (202) according to a comparison result between a charging power determined by at least one of the input voltage and the output voltage and the load current and a preset power threshold.
7. The charge control system according to claim 1, characterized by comprising:
a zero sequence current transformer (208), the zero sequence current transformer (208) being coupled to the relay (201); and
an excitation circuit (207) coupled to the processing circuit (203) and the zero sequence current transformer (208), respectively, for exciting the zero sequence current transformer (208) to generate a leakage current signal;
the processing circuit (203) comprises: the leakage fault management module (2037) determines the type of the leakage fault according to the magnitude and the waveform of the leakage current signal sent by the zero sequence current transformer (208).
8. The charge control system of claim 1, further comprising: a human machine interface (209), the human machine interface (209) being coupled to the processing circuit (203) for displaying a charging status and/or an electrical fault type.
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| CN202021636060.XU CN213425778U (en) | 2020-08-07 | 2020-08-07 | Charging control system for electric vehicle charging device |
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| CN202021636060.XU CN213425778U (en) | 2020-08-07 | 2020-08-07 | Charging control system for electric vehicle charging device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114211996A (en) * | 2021-12-17 | 2022-03-22 | 山东智捷充科技有限公司 | Multichannel distributing type electric automobile alternating current charging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114211996A (en) * | 2021-12-17 | 2022-03-22 | 山东智捷充科技有限公司 | Multichannel distributing type electric automobile alternating current charging system |
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