WO2016058214A1

WO2016058214A1 - Monitoring and protection apparatus and method for electric field coupling wireless charging system

Info

Publication number: WO2016058214A1
Application number: PCT/CN2014/089168
Authority: WO
Inventors: 汤晓君; 娄阳; 王金明; 管智岑; 徐萍
Original assignee: 江苏嘉钰新能源技术有限公司
Priority date: 2014-10-14
Filing date: 2014-10-22
Publication date: 2016-04-21
Also published as: CN104319740A

Abstract

A monitoring and protection apparatus and method for an electric field coupling wireless charging system. The monitoring and protection apparatus comprises a wireless charging system as well as a charged device parameter monitoring apparatus and a charging apparatus parameter monitoring apparatus which are used for monitoring and protecting the wireless charging system; and when a charging process begins, a charged device sends a rated voltage, current and working temperature range of a storage battery to a charging apparatus, and during the charging process, the charged device detects the charging voltage, current and working temperature in real time and sends same to the charging apparatus. The charging apparatus monitors the working current, voltage and working temperature per se at the same time, and a controller on the charging apparatus switches off a charging circuit by means of a relay so as to guarantee the safety of the charging system during the charging process and displays a reason on a display. Reliability and rapidness in detection can be realized, and charging safety is guaranteed.

Description

Monitoring and protection device for electric field coupled wireless charging system and method thereof

Technical field

The present invention relates to the field of wireless charging, and more particularly to the field of wireless charging based on electric field coupling.

Background technique

In recent years, there have been more and more cars, and the world's traffic has become more and more crowded, which has led to more and more serious urban pollution. The smog weather in China's cities has occurred. In order to reduce urban pollution, electric vehicles have become more and more promising as the next generation of urban transportation. However, the charging problem of electric vehicles has not been satisfactorily resolved. The conventional wired charging method, on the one hand, dragging a "tail" on the car makes the limited volume of the car more limited; on the other hand, there are some safety hazards in the wired charging, and more importantly, some female drivers are plugging and unplugging. The power cord is struggling. At present, in order to overcome this difficulty, many researchers and engineers have studied many wireless charging methods.

In order to implement safe and efficient wireless charging, the parameters of the charging device and the device to be charged must be monitored and fed back to the charging device to make a comprehensive status assessment and make a decision. Currently, commonly used wireless charging methods include methods such as electromagnetic induction, magnetic resonance, and microwave. These charging methods are all in one coil. In the range of coil alignment, the electromagnetic field is very strong, and it is difficult to implement radio wave wireless communication. If optical signals are transmitted by optical means, it is susceptible to dust, leaves, paper dust, etc.; Conventional wireless charging method, because of the presence of the coil, causes the resistance in the coil to consume part of the energy, and the charging efficiency thereof is difficult to improve. To this end, the applicant applied for a patent for a wireless charging method and apparatus based on electric field coupling, which can perform wireless communication of radio waves between the charging device and the device to be charged, and the charging device and the device to be charged Both have no coils, higher charging efficiency, no electromagnetic radiation, and safer charging.

The wireless charging method and device are equipped with a wireless communication device and a voltage, current and temperature detecting device for inter-parameter communication between the charged device and the charging device, and on the basis of these parameters, different pairs are implemented on the same charging device. The rated voltage is wirelessly charged by the charging device.

Although the electric field coupled wireless charging method has no electromagnetic radiation and is more efficient, if there is an abnormal phenomenon in the charging process, resulting in charging control, the battery may be burned out or even a life safety accident may occur, so strict monitoring is required. The patent proposes a monitoring and protection device for an electric field coupled wireless charging system that is bidirectionally monitored by a charging device and a charging device.

Summary of the invention

It is an object of the present invention to provide a monitoring and protection apparatus and method for ensuring safe operation of a wireless charging system during wireless charging based on electric field coupling.

In order to achieve the above object, the technical solution adopted by the device of the present invention is:

A monitoring and protection device for an electric field coupled wireless charging system, comprising: a wireless charging system; and a charged device parameter monitoring device and a charging device parameter monitoring device for monitoring and protecting the wireless charging system; In the charging system, the mains grid voltage V1 is connected to the first rectifier bridge T1, and the positive end of the first rectifier bridge T1 is connected to the switch K1 and the resistor R1, respectively, and the other end of the switch K1 and the resistor R1 is connected to the first filter capacitor C1, A filter capacitor C1 is connected at both ends of the inverter to the two input terminals, and the direct current is converted into an intermediate frequency alternating current, and the first output end of the inverter is sequentially connected to the first charging device plate and the first charged device plate, The second output end of the transformer is connected to the second charging device plate and the second charged device plate in sequence, and the other end of the first charged device plate and the second charged device plate are respectively connected to the second rectification Two input ends of the bridge T2, the two output ends of the second rectifier bridge T ₂ are sequentially connected in parallel with the second filter capacitor C2 and the battery voltage V2; the charged device parameter monitoring device includes a microprocessor, a first voltage detection, a first current detection, a first temperature detection, a first wireless transmission device, a first normally closed relay, a first closed switch, the microprocessor and the first voltage detection, respectively The current detection, the first temperature detection, the first wireless transmission device, and the first normally closed relay are connected, the first normally closed relay is connected to the first closed switch, and the microprocessor is used for comparing and determining the operating condition of the parameter of the charged device. And controlling the switch and the first normally closed relay state to obtain the first voltage detection, the first current detection, the first temperature detection result, and the control data transmission; the first voltage detection, the first current detection, and the first temperature detection respectively For detecting a battery actual operating voltage, an operating current, and an operating temperature, the first wireless transmission device is configured to transmit a rated voltage, a current, and an operating temperature range of the battery to a second wireless transmission device of the charging device; The parameter monitoring device includes a controller, a second voltage detection, a second current detection, a second temperature detection, and a second wireless transmission a second normally closed relay, a second closed switch, a liquid crystal display, an alarm, the controller and the second voltage detection, the second current detection, the second temperature detection, the second wireless transmission device, and the second normally closed The relay, the liquid crystal display and the alarm are connected, the second normally closed relay and the second closed switch are connected, and the controller is used for comparing and determining the operating condition of the charged device parameter and the charging device parameter, and controlling the switch and the second normally closed relay The second voltage detection, the second current detection, and the second temperature detection are respectively used to detect the operating voltage, the operating current, and the operating temperature of the charging device itself.

Further, the first charged device plate and the second charged device plate are all mounted on the chassis of the electric vehicle, parallel to the ground, and the electrode plate is covered by the insulating sheath.

Further, the wireless transmission device is used for wireless signal data transmission, and is installed in a radio mode, a photoelectric mode, or an ultrasonic mode, or both.

Further, the microprocessor is a single chip microcomputer, or a digital processor, or an Arm system.

Further, the microprocessor stores a rated voltage, a rated charging current, and an operating temperature range of the battery.

Further, the controller is an Omron programmable controller.

The technical solution of the method of the invention is:

A method for monitoring and protecting an electric field coupled wireless charging system includes the following steps:

1) At the beginning of the charging process, the charged device transmits the rated voltage, current, and operating temperature range of the battery to the charging device through its wireless data transmission device; during the charging process, the charged device detects the battery charging voltage, current, and current in real time. The operating temperature is sent to the charging device through the wireless data transmission device. At the same time, the microprocessor compares the monitored current with the rated working current, the operating temperature and the battery operating temperature, and also the charging voltage and the rated voltage of the battery. For comparison, if the actual voltage is less than or equal to the rated voltage and the current is greater than the rated current, it indicates that the charging system is abnormal, the first normally closed relay is disconnected, and the charging circuit is disconnected. If the operating temperature of the charged device is higher than the allowable battery The operating temperature range, also disconnects the first normally closed relay to prevent accidents, the first normally closed relay must manually close the closed switch on the charged device to close it again;

2) The charging device will only close the switch K1 and start the inverter after receiving the charging request from the charged device. Otherwise, the inverter is always in the off state; whether in the charging state or the non-charging state, the charging device At the same time, monitor its working voltage, working current and working temperature, and compare the monitoring result with the rated working voltage, rated working current and working temperature range of the charging device. If one of the items exceeds the corresponding rated value, the second normally closed is disconnected. In addition, the charging device simultaneously performs the comparison in step 1). If the abnormal phenomenon occurs in step 1), the controller on the charging device similarly turns off the charging circuit through the second relay to ensure the charging system during charging. Safety, while displaying the type of fault on the display and activating the alarm, the second normally closed relay on the charging device can only be closed when the closing switch is pressed.

Since the electric field-coupled wireless charging method has no coil, the loss due to the large internal resistance existing in the coil can be avoided, and the charging efficiency is high. Moreover, the method has no electromagnetic leakage, so there is no electromagnetic radiation around the wireless charging system. For the human body, its safety is good.

The invention has the beneficial effects as the monitoring system of the wireless charging method and system:

The invention makes the wireless charging system based on electric field coupling safe and reliable, and can quickly detect and effectively protect the charged device and the charging device in the event of a fault or abnormality, thereby reducing or even avoiding the wireless failure due to system failure. In addition to the damage caused by the components of the charging system, it can also ensure that in the event of a malfunction, the body of the person or animal surrounding the wireless charging system is not injured.

Secondly, the invention adopts the double relay protection control, can effectively protect the safety of the articles and personnel on the electric vehicle caused by the leakage in time, and further improves the safety of the electric vehicle.

Furthermore, the present invention adopts a method of exchanging information before charging, thereby avoiding burning of the battery due to a change in the rated voltage of the charged device, which improves the reliability of the monitoring and protection system.

In addition, radio communication equipment is currently the most mature and relatively inexpensive wireless communication equipment. Compared with optical communication methods, it can avoid the influence of obstacles such as dust and leaves, compared with conventional electromagnetic induction, magnetic resonance and The microwave wireless charging method, the method uses the wireless communication method to exchange the monitoring parameter information between the charging device and the charged device, and can effectively avoid the influence of the space electromagnetic field, which further improves the reliability of the monitoring and protection system.

DRAWINGS

1 is a schematic structural view of a charging device based on electric field coupling according to the present invention;

2 is a block diagram showing the principle of an automatic monitoring and protection system on a device to be charged according to the present invention;

3 is a block diagram showing the principle of an automatic monitoring and protection system on the charging device of the present invention;

Figure 4 is a working flow chart of the automatic monitoring and protection system of the present invention.

In the figure: 1 is the inverter, 2 is the first charging device plate, 3 is the second charging device plate, 4 is the first charged device plate, 5 is the second charged device plate, 6 is insulated Jacket; V ₁ is the mains grid, T ₁ is the first rectifier bridge, C ₁ is the first filter capacitor, V ₂ is the battery, T ₂ is the second rectifier bridge, C ₂ is the second filter capacitor, and R ₁ is Resistance, K ₁ is a switch.

detailed description

To illustrate the embodiments of the above solution, the present invention is described in connection with an automatic protection device for an electric vehicle based wireless charging device of an electric vehicle.

The schematic diagram of the electric field-coupled wireless charging device of the present invention is shown in FIG. 1. V1 is the mains grid voltage, which can be 380V three-phase power, 220V two-phase power, or special power conversion. Output voltage, T1 is the first rectifier bridge, C1 is the first filter capacitor, C1 is filtered by the DC filter after T1 rectification to obtain less harmonic DC current, and the inverter becomes intermediate frequency AC, and the two outputs of the AC pass respectively. Two different capacitive couplings are connected to the charging circuit of the electric vehicle. One electrode plate of each capacitor is connected to the output end of the inverter on the charging device, and the other electrode plate is mounted on the chassis of the electric vehicle, substantially parallel to the ground, connected to the charging circuit of the electric vehicle, and the electrode plate is insulated Set of quilts. The charging circuit of the electric vehicle is connected with a second rectifier bridge T2 and a second filter capacitor C2, and the DC voltage V2 is obtained to charge the battery. Due to the high-frequency and low-frequency characteristics of the capacitor, the AC output from the inverter is coupled to the charging circuit of the electric vehicle through a capacitive electric field.

The automatic monitoring and protection system includes the parameter detection and protection part on the device to be charged (as shown in Figure 2), and the parameter monitoring and protection part on the charging device (as shown in Figure 3). The former is installed on the electric vehicle, then Installed on the charging device.

For the parameter detection and protection part on the device to be charged, the structure diagram is as shown in FIG. 2, the first voltage detection is to detect the voltage across the second filter capacitor C2 in FIG. 1, and the first current detection is to monitor FIG. The current at the output of the second rectifier bridge T2 can also be the current at its input. If the input is detected, the AC current sensor is used. If it is the output, the DC current sensor is used; the first normally closed relay is connected in series. 1 in the AC input of T2; the first temperature detection is to monitor the temperature of the battery; the first wireless transmission device is installed between the plates. The first voltage detection, the first current detection, and the first temperature detection signals are all transmitted to the microprocessor, and the microprocessor further controls the first normally closed relay and the first wireless transmission system. The microprocessor of this part can be a single-chip computer (such as C51 single-chip microcomputer), a digital processor, or an embedded system such as Arm. The closed switch is used to forcibly close the normally closed normally closed relay so that the system can be re-entered after the inspection.

For the parameter detection and protection part on the charging device, the structure diagram is as shown in FIG. 3, and the second voltage detection is to detect the voltage across the first filter capacitor C1 in FIG. 1 (input voltage at both ends of the inverter), The second current detection is to monitor the current at the output end of the first rectifier bridge T1 in FIG. 1, or the current at the input end thereof, if the detection input terminal, the alternating current sensor is used, and if it is the output terminal, the direct current sensor is used; The normally closed relay is connected in series with the AC input of T1 in Figure 1; the second wireless transmission is mounted between the plates. Compared with the parameter detection and protection part on the device being charged, this part also has obvious Screen and alarm system, and this part of the central processor is a controller (such as Omron programmable controller). The controller controls the inverter 1 of Fig. 1 in addition to the voltage, current and temperature signals, the control of the second normally closed relay, the display screen and the alarm system.

The workflow of the automatic monitoring and protection system of the wireless charging system is as shown in FIG. The monitored device and the monitoring device on the charging device operate in parallel. After the poles of the wireless charging system are docked, the charging circuit (charged device) on the electric vehicle sends the rated current, rated voltage and operating temperature range of the electric battery to the charging device, and then detects its actual working voltage and works. Current and battery temperature, and send these values to the charging device (at this time, these values are received by the second wireless transmission device), and then the microprocessor compares the measured result with the corresponding rating, if the voltage is within the normal range, If the current is too large, or the temperature is too large, the first normally closed relay is turned off, otherwise, the charging line voltage, current and temperature detection on the next charged device are restarted. After the charging device is docked, the second wireless transmission device first receives the rated rated current, the rated voltage and the operating temperature range of the electric vehicle battery, and stores it in the memory of the controller; and then detects the charging device's own line. Working voltage, working current, working temperature, and receiving the actual working voltage, working current and working temperature of the battery sent on the electric vehicle, and then performing the comparison performed in the microprocessor on the electric vehicle, and the working voltage and current of the line If the voltage on the charging line of the electric vehicle is normal, but the current is too high, or the temperature is too high, the second normally closed relay is cut off; if the line voltage is too high, or the current is too large, the second normally closed is also cut off. The relay, and the type of fault is displayed on the display, that is, whether the current on the charged device is too large, the battery temperature is too high, or the voltage of the charging device is too high. After the maintenance, after the maintenance person presses the first closed switch and the second closed switch, the first normally closed relay and the second normally closed relay are closed, and the next normal charging is entered.

The above is a detailed description of the present invention in conjunction with the specific preferred embodiments, and the specific embodiments of the present invention are not limited thereto, and those skilled in the art to which the present invention pertains, without departing from the scope of the present invention. In the following, it is also possible to make a number of simple deductions or substitutions, which should be considered as belonging to the invention as defined by the appended claims.

Claims

A monitoring and protection device for an electric field coupled wireless charging system, comprising: a wireless charging system; and a charged device parameter monitoring device and a charging device parameter monitoring device for monitoring and protecting the wireless charging system;

In the wireless charging system, the grid voltage V1 is connected to the input end of the first rectifier bridge T1, and the positive end of the first rectifier bridge T1 is respectively connected to the switch K1 and the resistor R1, and the other end of the switch K1 and the resistor R1 is connected to the first filter. Capacitor C1, the first filter capacitor C1 is connected in parallel with two input ends of the inverter (1), and the direct current is converted into an intermediate frequency alternating current, and the first output end of the inverter (1) is sequentially connected to the first charging device. a plate (2), a first device to be charged (4), and a second output of the inverter (1) is sequentially connected to the second charging device plate (3) and the second device to be charged (5) The other ends of the first charged device board (4) and the second charged device board (5) are respectively connected to two input ends of the second rectifier bridge T2, and the second rectifier bridge T 2 The two output terminals are sequentially connected in parallel with the second filter capacitor C2 and the battery voltage V2;

The charged device parameter monitoring device includes a microprocessor, a first voltage detection, a first current detection, a first temperature detection, a first wireless transmission device, a first normally closed relay, and a first closed switch; Separably connected to the first voltage detection, the first current detection, the first temperature detection, the first wireless transmission device, and the first normally closed relay, wherein the first normally closed relay is connected to the first closed switch, and the micro processing The device is configured to compare and determine the operating condition of the parameter of the charged device and control the switch and the first normally closed relay state, obtain the result of the first voltage detection, the first current detection, the first temperature detection, and control data transmission; the first voltage detection The first current detection and the first temperature detection are respectively used to detect the actual working voltage, the working current and the working temperature of the battery, and the first wireless transmission device is configured to send the rated voltage, current, and operating temperature range of the battery to the charging device. Second wireless transmission device;

The charging device parameter monitoring device comprises a controller, a second voltage detection, a second current detection, a second temperature detection, a second wireless transmission device, a second normally closed relay, a second closed switch, a liquid crystal display, an alarm; The controller is respectively connected to the second voltage detection, the second current detection, the second temperature detection, the second wireless transmission device, the second normally closed relay, the liquid crystal display, the alarm, the second normally closed relay and the second The closed switch is connected; the controller is configured to compare and determine the operating condition of the charged device parameter, the charging device parameter, and control the switch and the second normally closed relay state; the second voltage detection, the second current detection, and the second temperature detection They are used to detect the operating voltage, operating current and operating temperature of the charging device itself.
A monitoring and protection device for an electric field coupled wireless charging system according to claim 1 The first device to be charged (4) and the second device to be charged (5) are both mounted on the chassis of the electric vehicle, parallel to the ground, and the electrode plates are covered by an insulating sheath.
The apparatus for monitoring and protecting an electric field coupled wireless charging system according to claim 1, wherein said wireless transmission device is configured to transmit wireless signal data in a radio mode, or in a photoelectric mode, or an ultrasonic mode, or Both are installed.
The apparatus for monitoring and protecting an electric field coupled wireless charging system according to claim 1, wherein the microprocessor is a single chip microcomputer, or a digital processor, or an embedded system.
The apparatus for monitoring and protecting an electric field coupled wireless charging system according to claim 4, wherein said microprocessor stores a rated voltage, a rated charging current, and an operating temperature range of the battery.
The monitoring and protection device for an electric field coupled wireless charging system according to claim 1, wherein the controller is a programmable controller or an embedded system.
A method for monitoring and protecting an electric field coupled wireless charging system, comprising the steps of:

1) At the beginning of the charging process, the charged device transmits the rated voltage, current, and operating temperature range of the battery to the charging device through the first wireless data transmission device; during the charging process, the charged device detects the battery charging voltage, current, and current in real time. The operating temperature is sent to the charging device through the wireless data transmission device. At the same time, the microprocessor compares the monitored current with the rated working current, the operating temperature and the battery operating temperature, and also the charging voltage and the rated voltage of the battery. For comparison, if the actual voltage is less than or equal to the rated voltage and the current is greater than the rated current, it indicates that the charging system is abnormal, the first normally closed relay is disconnected, and the charging circuit is disconnected. If the operating temperature of the charged device is higher than the allowable battery The operating temperature range, also disconnects the first normally closed relay to prevent accidents, the first normally closed relay must manually close the closed switch on the charged device to close it again;

2) The charging device will only close the switch K1 and start the inverter after receiving the charging request from the charged device. Otherwise, the inverter is always in the off state; whether in the charging state or the non-charging state, the charging device At the same time, monitor its working voltage, working current and working temperature, and compare the monitoring result with the rated working voltage, rated working current and working temperature range of the charging device. If one of the items exceeds the corresponding rated value, the second normally closed is disconnected. In addition, the charging device simultaneously performs the comparison in step 1). If the abnormal phenomenon occurs in step 1), the controller on the charging device similarly turns off the charging circuit through the second relay to ensure the charging system during charging. Safe while displaying on the display The type of barrier and activation of the alarm, the second normally closed relay on the charging device can only be closed when the closing switch is pressed.