CN112158096A - Charging control circuit, control box and charging wire - Google Patents
Charging control circuit, control box and charging wire Download PDFInfo
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- CN112158096A CN112158096A CN202011073962.1A CN202011073962A CN112158096A CN 112158096 A CN112158096 A CN 112158096A CN 202011073962 A CN202011073962 A CN 202011073962A CN 112158096 A CN112158096 A CN 112158096A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/60—Monitoring or controlling charging stations
- B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/12—Electric charging stations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging control circuit, a control box and a charging wire, and relates to the technical field of electric automobile charging. The charging control circuit is formed by arranging a control chip, a relay driving circuit, a power supply circuit and a temperature sensor. The power supply circuit is used for providing a working power supply for the control chip; the temperature sensor is used for detecting the ambient temperature, generating a temperature signal according to the ambient temperature and transmitting the temperature signal to the control chip; the control chip is used for generating a relay control signal according to the temperature signal and transmitting the relay control signal to the relay drive circuit; the relay driving circuit is used for driving the relay according to the relay control signal so as to control the on-off of the power supply bus. In the invention, the ambient temperature can reflect the working temperature of the charging circuit; the control chip can be higher detecting the temperature of charging, through the disconnection of drive relay to cut off the power supply bus bar power supply, thereby avoid appearing overheated or ablation scheduling problem when charging.
Description
Technical Field
The invention relates to the technical field of electric automobile charging, in particular to a charging control circuit, a control box and a charging wire.
Background
According to the charging characteristics of the electric vehicle, the charging mode is mainly divided into an alternating current charging mode and a direct current charging mode. Wherein, direct current mode adopts direct current to fill electric pile to electric automobile charging, and the charging speed is fast. Alternating current mode adopts the electric pile and the domestic charging wire that fill of vehicle-mounted configuration to charge to electric automobile, and is not high to the installation environment requirement that charges, and the installation cost is low, uses the 220V power of family, and it is convenient to charge.
At present, when an electric automobile is charged, problems such as overheating or ablation easily occur, and the safety and the service life of charging equipment are affected, so how to ensure the charging safety of a battery automobile is a technical problem to be solved urgently.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a charging control circuit, a control box and a charging wire, and aims to solve the technical problem that an electric automobile is easy to overheat or ablate when being charged in the prior art.
To achieve the above object, the present invention provides a charge control circuit, including: the temperature control circuit comprises a control chip, a relay driving circuit, a power circuit and a temperature sensor, wherein the output end of the power circuit is connected with the control chip, the output end of the control chip is connected with the input end of the relay driving circuit, the output end of the relay driving circuit is connected with the relay, and the relay is arranged on a power bus; the output end of the temperature sensor is connected with the control chip;
the power supply circuit is used for providing a working power supply for the control chip;
the temperature sensor is used for detecting the ambient temperature, generating a temperature signal according to the ambient temperature and transmitting the temperature signal to the control chip;
the control chip is used for generating a relay control signal according to the temperature signal and transmitting the relay control signal to the relay driving circuit;
and the relay driving circuit is used for driving the relay according to the relay control signal so as to control the on-off of the power supply bus.
Optionally, the charging control circuit further includes a filter circuit, an input end of the filter circuit is connected to the power bus, and a first output end of the filter circuit is connected to an input end of the power circuit;
the filter circuit is used for collecting the voltage on the power bus and filtering the collected voltage to obtain a filtered voltage signal;
the power circuit is further configured to convert the filtered voltage signal into a working voltage of the control chip.
Optionally, the charging control circuit further includes a voltage detection circuit, and an input end of the voltage detection circuit is connected to the second output end of the filter circuit; the output end of the voltage detection circuit is connected with the control chip;
the voltage detection circuit is used for generating a voltage protection signal according to the filtered voltage signal and transmitting the voltage protection signal to the control chip;
the control chip is further configured to generate an over-voltage and under-voltage control signal according to the voltage protection signal, and use the over-voltage and under-voltage control signal as the relay control signal.
Optionally, the charging control circuit further includes a leakage detection circuit and a transformer, the transformer is disposed on the power bus, a first input end of the leakage detection circuit is connected to an output end of the transformer, and an output end of the leakage detection circuit is connected to the control chip;
the mutual inductor is used for detecting the current of the power supply bus;
the leakage detection circuit is used for generating a leakage protection signal according to the first current signal output by the mutual inductor and transmitting the leakage protection signal to the control chip;
the control chip is further configured to determine a leakage current according to the leakage protection signal, generate a leakage control signal when the leakage current is greater than a preset value, and use the leakage control signal as the relay control signal.
Optionally, the charging control circuit further includes a current sensor, the current sensor is disposed on the power supply bus, and an output end of the current sensor is connected to the second input end of the leakage detection circuit;
the leakage detection circuit is also used for generating an overcurrent protection signal according to a second current signal output by the current sensor and transmitting the overcurrent protection signal to the control chip;
the control chip is further used for determining an overcurrent current according to the leakage overcurrent protection signal, generating an overcurrent control signal according to a preset switch control strategy when the overcurrent current is larger than a preset value, and taking the overcurrent control signal as the relay control signal.
Optionally, the charging control circuit further includes a pilot signal generating circuit, an input end of the pilot signal generating circuit is connected to the control chip, and an output end of the pilot signal generating circuit is connected to an output end of the power bus;
the guide signal generating circuit is used for generating a charging control signal so as to regulate the voltage output by the output end of the power bus.
Optionally, the charging control circuit further includes a pilot signal acquisition circuit, an input end of the pilot signal acquisition circuit is connected to the pilot signal generation circuit, and an output end of the pilot signal acquisition circuit is connected to the control chip;
the guide signal acquisition circuit is used for acquiring the charging control signal and transmitting the charging control signal to the control chip;
the control chip is further configured to generate a pilot control signal according to the charging control signal, and use the pilot control signal as the relay control signal.
Optionally, the charging control circuit further includes an LED circuit, and the LED circuit is connected to the control chip;
and the LED circuit is used for receiving the display signal transmitted by the control chip and driving the LED lamp to display according to the display signal.
To achieve the above object, the present invention also provides a charging control box, which includes the charging control circuit as described above.
In order to achieve the above purpose, the invention further provides an electric vehicle charging cable, which is characterized in that the electric vehicle charging cable comprises an input cable, an output cable, a charging plug, a charging gun and the charging control box, wherein the input end of the charging control box is connected with the charging plug through the input cable, and the output end of the charging control box is connected with the charging gun through the output cable.
The charging control circuit is formed by arranging a control chip, a relay driving circuit, a power supply circuit and a temperature sensor. The power circuit is used for providing a working power supply for the control chip; the temperature sensor is used for detecting the ambient temperature, generating a temperature signal according to the ambient temperature and transmitting the temperature signal to the control chip; the control chip is used for generating a relay control signal according to the temperature signal and transmitting the relay control signal to the relay driving circuit; and the relay driving circuit is used for driving the relay according to the relay control signal so as to control the on-off of the power supply bus. In the invention, the ambient temperature can reflect the working temperature of the charging circuit; the control chip can be higher detecting the temperature of charging, through the disconnection of drive relay to cut off the power supply bus bar power supply, thereby avoid appearing overheated or ablation scheduling problem when charging.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic circuit diagram of a charging control circuit according to a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a charging control circuit according to a second embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a charge control circuit according to a third embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a charge control circuit according to a fourth embodiment of the present invention
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | |
800 | |
| 200 | Relay with a |
900 | Electric |
| 300 | |
1000 | |
| 400 | |
1100 | |
| 500 | |
1200 | Pilot |
| 600 | |
1300 | Guide |
| 700 | |
1400 | LED circuit |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a circuit structure diagram of a charging control circuit according to a first embodiment of the present invention.
As shown in fig. 1, in the present embodiment, the charge control circuit includes: the temperature control circuit comprises a control chip 100, a relay 200, a relay driving circuit 300, a power circuit 400 and a temperature sensor 500, wherein the output end of the power circuit 400 is connected with the control chip 100, the output end of the control chip 100 is connected with the input end of the relay driving circuit 300, the output end of the relay driving circuit 300 is connected with the relay 200, and the relay 200 is arranged on a power bus 600; the output end of the temperature sensor 500 is connected to the control chip 100.
It should be noted that the power bus 600 may be an ac bus or a dc bus, and the power bus 600 refers to a cable for transmitting electric energy from a power supply device to a device to be charged. For example, when electric automobile charges, electric automobile passes through the charging wire and is connected with charging pile, contains the power supply bus who transmits electric energy in the charging wire. The charging wire usually includes the control box, and the control circuit that charges in this embodiment can set up in the control box on the charging wire.
In the charging control circuit of the present embodiment, the power circuit 400 is configured to provide a working power supply for the control chip 100. The temperature sensor 500 is configured to detect an ambient temperature, generate a temperature signal according to the ambient temperature, and transmit the temperature signal to the control chip 100. The control chip 100 is configured to generate a relay control signal according to the temperature signal, and transmit the relay control signal to the relay driving circuit 300. The relay driving circuit 300 is configured to drive the relay 200 according to the relay control signal to control on/off of the power bus 600.
The operating voltage of the control chip 100 is usually 5V, and the power circuit 400 may be a battery circuit, and the operating voltage is provided to the control chip by a built-in battery. The power circuit 400 may also provide a power conversion circuit for converting an external power into a control chip to provide a working voltage. For example, the external 24V or 12V voltage is converted into 5V voltage by the power management chip.
In this embodiment, the temperature sensor 500 may be disposed on an inner wall of the control box, so as to better detect the charging temperature and prevent the charging circuit from being damaged due to overheating. The control chip 100 may be an STM series chip, and determines the current ambient temperature by detecting a temperature signal; and generating a relay control signal according to the built-in control logic. For example, when the current ambient temperature exceeds 45 ℃, a relay-off control signal is generated to turn off the relay 200. Or when the current environment temperature lasts for 10 seconds and exceeds 40 ℃, generating a relay cut-off control signal; and if the duration time is less than 40 ℃ for 10 seconds, generating a relay connection control signal to recover the power supply.
It is understood that the relay control signal may be a voltage signal, and the relay driving circuit 300 controls the on/off of the power bus after receiving the voltage signal. In a specific implementation, the relay driving circuit 300 may include a switching circuit configured based on a triode. The triode can be conducted when the base receives high level, so that the relay is driven to be switched on and off. The relay can be selected to be a normally closed type or a normally open type. Of course, the relay driver circuit 300 may be formed by other components, and this embodiment mode is not limited thereto.
The charging control circuit is formed by arranging a control chip, a relay driving circuit, a power supply circuit and a temperature sensor. The power circuit is used for providing a working power supply for the control chip; the temperature sensor is used for detecting the ambient temperature, generating a temperature signal according to the ambient temperature and transmitting the temperature signal to the control chip; the control chip is used for generating a relay control signal according to the temperature signal and transmitting the relay control signal to the relay driving circuit; and the relay driving circuit is used for driving the relay according to the relay control signal so as to control the on-off of the power supply bus. In the present embodiment, the ambient temperature can reflect the operating temperature of the charging circuit; the control chip can be higher detecting the temperature of charging, through the disconnection of drive relay to cut off the power supply bus bar power supply, thereby avoid appearing overheated or ablation scheduling problem when charging.
Referring to fig. 2, fig. 2 is a circuit structure diagram of a charging control circuit according to a second embodiment of the present invention. Based on the first embodiment, a second embodiment of the charge control circuit of the present invention is provided.
As shown in fig. 2, in the second embodiment, the charging control circuit further includes a filter circuit 700, an input terminal of the filter circuit 700 is connected to the power bus 600, and a first output terminal of the filter circuit 700 is connected to an input terminal of the power circuit 400.
In order to improve the integration of the charge control circuit, in the present embodiment, the power supply circuit 400 directly converts the voltage on the power bus 600 to obtain the operating voltage of the control chip 100.
The filter circuit 700 is configured to collect a voltage on the power bus 600, and filter the collected voltage to obtain a filtered voltage signal.
In the present embodiment, the power bus is described as an ac bus as an example. Since the amplitude of the alternating current varies with time, it is also susceptible to external environmental influences. Therefore, it is necessary to filter the alternating current to obtain a voltage signal of the temperature.
The power circuit 400 is further configured to convert the filtered voltage signal into a working voltage of the control chip 100.
It is understood that, usually, the voltage of the ac bus is 220V, and the power circuit 400 may further include a step-down circuit formed based on a transformer, where the transformer converts the 220V voltage into 24V or 12V voltage, and then converts the voltage into 5V voltage through the voltage management chip, so as to supply power to the control chip 100.
In the second embodiment, in order to protect charging more fully, the charging control circuit further includes a voltage detection circuit 800, an input terminal of the voltage detection circuit 800 is connected to the second output terminal of the filter circuit 700; the output end of the voltage detection circuit 800 is connected to the control chip 100.
It should be noted that the voltage detection circuit 800 may include a voltage sensor for detecting the voltage value of the power bus 600. In order to make the detection more accurate and stable, in the present embodiment, the voltage sensor is disposed in the filter circuit 700.
The voltage detection circuit 800 is configured to generate a voltage protection signal according to the filtered voltage signal, and transmit the voltage protection signal to the control chip 100. The control chip 100 is further configured to generate an over-voltage and under-voltage control signal according to the voltage protection signal, and use the over-voltage and under-voltage control signal as the relay control signal.
It should be noted that the voltage detection circuit 800 can detect the voltage value of the power bus 600, so as to determine whether the power bus 600 has an overvoltage or an undervoltage. For example, when the voltage value of the power bus 600 continuously exceeds 200mS and exceeds the set value 250V, overvoltage protection is performed to generate an overvoltage control signal, so that the control chip 100 cuts off the relay; and when the voltage value of the power bus 600 is continuously lower than the safety value 230V by 30S, the power supply is recovered. Or, when the voltage value of the power bus 600 is continuously 200mS and is lower than the set value 180V, performing under-voltage protection, and generating an under-voltage control signal to enable the control chip 100 to cut off the relay; and when the voltage value of the power bus 600 is continuously higher than the safe value 210V by 30S, the power supply is recovered. Of course, the above numerical values are only exemplary, and the safety value, the setting value, and the time value may be freely set according to the user requirement, which is not limited in this embodiment.
In the second embodiment, a filter circuit and a voltage detection circuit are added to the charge control circuit. On the one hand, after the voltage on the power bus is filtered by the filter circuit, the voltage is converted into the working voltage of the control chip through the power circuit, and the integration level is improved. The inconvenience caused by the built-in battery is avoided. In another mode, the voltage filtered by the filter circuit is used for voltage detection by the voltage detection circuit, so that the voltage condition of the power bus is monitored more accurately, overvoltage and undervoltage protection is performed in time, and the charging safety is further improved.
Referring to fig. 3, fig. 3 is a circuit structure diagram of a charge control circuit according to a third embodiment of the present invention. Based on the first embodiment and the second embodiment described above, a third embodiment of the charge control circuit of the present invention is proposed. The present embodiment is explained based on the first embodiment.
As shown in fig. 3, in the third embodiment, the charging control circuit further includes a leakage detection circuit 900 and a transformer 1000, the transformer 1000 is disposed on the power bus 600, a first input end of the leakage detection circuit 900 is connected to an output end of the transformer 1000, and an output end of the leakage detection circuit 900 is connected to the control chip 100. The transformer 1000 is configured to detect a current of the power bus 600.
It should be noted that the transformer 1000 is a leakage detecting transformer, two power lines of the power bus pass through the transformer 1000, and since the currents on each wire are equal in magnitude and opposite in direction, the total current vector sum is equal to 0. When the wire below the transformer 1000 leaks electricity, the sum of the current vectors passing through the transformer 1000 is no longer equal to 0 due to the branch of the loop, and the induced potential is generated on the secondary side of the transformer, so that the detection of the leakage current is realized.
The leakage detection circuit 900 is configured to generate a leakage protection signal according to the first current signal output by the transformer 1000, and transmit the leakage protection signal to the control chip 100.
It is understood that the leakage detecting circuit 900 includes a leakage detecting chip, and the leakage detecting chip analyzes the first current signal output by the receiving transformer 1000, determines the magnitude of the leakage current, and transmits a leakage protection signal to the control chip 100. The leakage protection signal includes a leakage current.
The control chip 100 is further configured to determine a leakage current according to the leakage protection signal, generate a leakage control signal when the leakage current is greater than a preset value, and use the leakage control signal as the relay control signal.
After receiving the leakage protection signal, the control chip 100 determines whether the leakage current satisfies the safety condition, and if not, performs leakage protection. The control chip 100 generates a leakage control signal and takes the leakage control signal as the relay control signal. For example, if the leakage current continues for 100ms longer than the set value 2A, it is determined that the safety condition is not satisfied.
In the third embodiment, in order to protect charging more fully, the charging control circuit further includes a current sensor 1100, the current sensor 1100 is disposed on the power bus 600, and an output terminal of the current sensor 1100 is connected to the second input terminal of the leakage detecting circuit 900. The leakage detection circuit 900 is further configured to generate an overcurrent protection signal according to the second current signal output by the current sensor 1100, and transmit the overcurrent protection signal to the control chip 100.
It should be noted that the current sensor 1100 is used to detect the current on the power bus 600, and monitor the current to prevent the overcurrent. The leakage detecting circuit 900 amplifies the second current signal of the current sensor 1100 so as to facilitate the signal analysis of the control chip 100.
The control chip 100 is further configured to determine an overcurrent current according to the leakage overcurrent protection signal, generate an overcurrent control signal according to a preset switch control strategy when the overcurrent current is greater than a preset value, and use the overcurrent control signal as the relay control signal.
The control chip 100 determines the current according to the second current signal, and performs relay control by combining a preset control strategy. For example, different monitoring times are set according to different current set value sizes. For example, at the set value of 20A, the detection time is 3 minutes; at a set value of 30A, the detection time was 10 seconds. When detecting that the current continuously exceeds the set value 20A for 3 minutes or exceeds the set value 30A for 10 seconds, the control chip 100 generates an overcurrent control signal to turn off the relay. At the same time, recovery is automatically restarted after 10 seconds. After circulating for 3 times, the flow still overflows, and the automatic recovery is not carried out. The above numerical values are merely examples, and may be freely set according to user requirements, and this embodiment is not limited thereto.
In a third embodiment, the charging control circuit includes a transformer, a circuit sensor and a leakage detection circuit, and adds leakage detection and overcurrent protection functions to the charging control circuit. Meanwhile, different control strategies are set according to different electric leakage or overcurrent conditions, and therefore charging safety is improved.
Referring to fig. 4, fig. 4 is a circuit structure diagram of a charge control circuit according to a third embodiment of the present invention. A fourth embodiment of the charge control circuit of the present invention is proposed based on the above-described first, second, and third embodiments. The present embodiment is explained based on the first embodiment.
As shown in fig. 4, in the fourth embodiment, the charging control circuit further includes a pilot signal generating circuit 1200, an input terminal of the pilot signal generating circuit 1200 is connected to the control chip 100, and an output terminal of the pilot signal generating circuit 1200 is connected to an output terminal of the power bus 600; the pilot signal generating circuit 1200 is configured to generate a charging control signal to adjust a voltage output by the output terminal of the power bus.
It should be noted that, a charging gun is generally connected to the output end of the power bus 600, and when the charging gun completes the charging and electrifying actions, a guiding signal is required to complete the guiding. In this embodiment, the control chip 100 communicates with the signal generation circuit 1200, and when the charging operation is performed, the control signal generation circuit 1200 generates a charging control signal as a pilot signal according to a preset parameter. The charging control signal may be a PWM signal, and the duty ratio thereof may be set by a user according to a requirement.
In order to ensure the normal operation of the signal generating circuit 1200, in this embodiment, the charging control circuit further includes a pilot signal collecting circuit 1300, an input end of the pilot signal collecting circuit 1300 is connected to the pilot signal generating circuit 1200, and an output end of the pilot signal collecting circuit 1300 is connected to the control chip 100. The guidance signal acquisition circuit 1300 is configured to acquire the charging control signal and transmit the charging control signal to the control chip 100. The control chip 100 is further configured to generate a pilot control signal according to the charging control signal, and use the pilot control signal as the relay control signal.
It should be noted that the guidance signal acquisition circuit 1300 acquires the charging control signal, and performs filtering, so as to facilitate analysis by the control chip 100. The control chip 100 detects a duty ratio of the charge control signal, and determines whether the pilot signal generation circuit 1200 normally operates according to the duty ratio. For example, when the pilot signal generation circuit 1200 fails or is disconnected, the charge control signal duty ratio is 100%, and no output is made; when the pilot signal generating circuit 1200 is short-circuited, the charge control signal voltage is 0 and no output is made; and if no fault exists, the duty ratio of the charging control signal is a preset value. When detecting that the charging control signal is abnormal, the control chip 100 generates a guide control signal to turn off the relay; and after the fault is eliminated, the relay is communicated again to recover charging.
In addition, in the fourth embodiment, the charging control circuit further includes an LED circuit 1400, and the LED circuit 1400 is connected to the control chip 100; the LED circuit 1400 is configured to receive the display signal transmitted by the control chip 100, and drive the LED lamp to display according to the display signal.
It should be noted that the LED circuit 1400 may include a plurality of LED lamps, and the display modes of the LED lamps may include off, on, or off. The LED circuit 1400 may indicate different charging states by combining the display modes of the LED lamps. For example, the LED circuit 1400 may include 4 LED lamps, and when all of the 4 LED lamps are on for a long time, it indicates that the charging control circuit is overheated, an overheat protection state has been entered, and the relay has been turned off; when 2 LED lamps are on in 4 LED lamps, and 2 LED lamps twinkle, can show the control circuit electric leakage that charges, have got into the earth leakage protection state, and the relay has disconnected. Of course, the display mode combination of the LED lamps can be freely set by the user according to the requirement, and this embodiment mode is not limited thereto.
In the fourth embodiment, a pilot signal generating circuit is provided for generating a charging control signal to complete a charging power-on action when charging pilot is required. Meanwhile, a guide signal acquisition circuit is arranged to detect the charging control signal, and when the charging control signal is abnormal, the charging is stopped, so that the charging control circuit is prevented from being damaged. In addition, the LED circuit is arranged to display the state of the charging control circuit, so that a user can know the charging state conveniently.
In order to achieve the above object, the present invention further provides a charging control box, which includes the circuit as described above. The specific structure of the circuit refers to the above embodiments, and since the charging control box adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
In order to achieve the above purpose, the invention further provides an electric vehicle charging wire, which comprises an input cable, an output cable, a charging plug, a charging gun and the charging control box, wherein the input end of the charging control box is connected with the charging plug through the input cable, and the output end of the charging control box is connected with the charging gun through the output cable. Because this electric automobile charging wire has adopted all technical scheme of above-mentioned all embodiments, consequently have at least all beneficial effects that the technical scheme of above-mentioned embodiment brought, no longer give unnecessary details here.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A charge control circuit, comprising: the temperature control circuit comprises a control chip, a relay driving circuit, a power circuit and a temperature sensor, wherein the output end of the power circuit is connected with the control chip, the output end of the control chip is connected with the input end of the relay driving circuit, the output end of the relay driving circuit is connected with the relay, and the relay is arranged on a power bus; the output end of the temperature sensor is connected with the control chip;
the power supply circuit is used for providing a working power supply for the control chip;
the temperature sensor is used for detecting the ambient temperature, generating a temperature signal according to the ambient temperature and transmitting the temperature signal to the control chip;
the control chip is used for generating a relay control signal according to the temperature signal and transmitting the relay control signal to the relay driving circuit;
and the relay driving circuit is used for driving the relay according to the relay control signal so as to control the on-off of the power supply bus.
2. The charge control circuit of claim 1, further comprising a filter circuit, an input of the filter circuit being connected to a power bus, a first output of the filter circuit being connected to an input of the power circuit;
the filter circuit is used for collecting the voltage on the power bus and filtering the collected voltage to obtain a filtered voltage signal;
the power circuit is further configured to convert the filtered voltage signal into a working voltage of the control chip.
3. The charge control circuit of claim 2, further comprising a voltage detection circuit having an input terminal connected to the second output terminal of the filter circuit; the output end of the voltage detection circuit is connected with the control chip;
the voltage detection circuit is used for generating a voltage protection signal according to the filtered voltage signal and transmitting the voltage protection signal to the control chip;
the control chip is further configured to generate an over-voltage and under-voltage control signal according to the voltage protection signal, and use the over-voltage and under-voltage control signal as the relay control signal.
4. The charging control circuit of claim 1, further comprising a leakage detection circuit and a transformer, wherein the transformer is disposed on the power bus, a first input terminal of the leakage detection circuit is connected to an output terminal of the transformer, and an output terminal of the leakage detection circuit is connected to the control chip;
the mutual inductor is used for detecting the current of the power supply bus;
the leakage detection circuit is used for generating a leakage protection signal according to the first current signal output by the mutual inductor and transmitting the leakage protection signal to the control chip;
the control chip is further configured to determine a leakage current according to the leakage protection signal, generate a leakage control signal when the leakage current is greater than a preset value, and use the leakage control signal as the relay control signal.
5. The charge control circuit according to claim 4, further comprising a current sensor disposed on the power bus, wherein an output terminal of the current sensor is connected to the second input terminal of the leakage detection circuit;
the leakage detection circuit is also used for generating an overcurrent protection signal according to a second current signal output by the current sensor and transmitting the overcurrent protection signal to the control chip;
the control chip is further used for determining an overcurrent current according to the leakage overcurrent protection signal, generating an overcurrent control signal according to a preset switch control strategy when the overcurrent current is larger than a preset value, and taking the overcurrent control signal as the relay control signal.
6. The charge control circuit according to claim 1, further comprising a pilot signal generating circuit, wherein an input terminal of the pilot signal generating circuit is connected to the control chip, and an output terminal of the pilot signal generating circuit is connected to an output terminal of the power bus;
the guide signal generating circuit is used for generating a charging control signal so as to regulate the voltage output by the output end of the power bus.
7. The charge control circuit according to claim 6, further comprising a pilot signal acquisition circuit, wherein an input terminal of the pilot signal acquisition circuit is connected to the pilot signal generation circuit, and an output terminal of the pilot signal acquisition circuit is connected to the control chip;
the guide signal acquisition circuit is used for acquiring the charging control signal and transmitting the charging control signal to the control chip;
the control chip is further configured to generate a pilot control signal according to the charging control signal, and use the pilot control signal as the relay control signal.
8. The charge control circuit according to any one of claims 1 to 7, wherein the charge control circuit further comprises an LED circuit, the LED circuit being connected to the control chip;
and the LED circuit is used for receiving the display signal transmitted by the control chip and driving the LED lamp to display according to the display signal.
9. A charging control box characterized in that it comprises a charging control circuit according to any one of claims 1 to 8.
10. The electric vehicle charging wire is characterized by comprising an input cable, an output cable, a charging plug, a charging gun and the charging control box according to claim 9, wherein the input end of the charging control box is connected with the charging plug through the input cable, and the output end of the charging control box is connected with the charging gun through the output cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011073962.1A CN112158096A (en) | 2020-09-30 | 2020-09-30 | Charging control circuit, control box and charging wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011073962.1A CN112158096A (en) | 2020-09-30 | 2020-09-30 | Charging control circuit, control box and charging wire |
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| CN112158096A true CN112158096A (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011073962.1A Pending CN112158096A (en) | 2020-09-30 | 2020-09-30 | Charging control circuit, control box and charging wire |
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Cited By (1)
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Application publication date: 20210101 |