CN110649688B - Wireless charging control system and method based on battery temperature detection - Google Patents
Wireless charging control system and method based on battery temperature detection Download PDFInfo
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- CN110649688B CN110649688B CN201911002342.6A CN201911002342A CN110649688B CN 110649688 B CN110649688 B CN 110649688B CN 201911002342 A CN201911002342 A CN 201911002342A CN 110649688 B CN110649688 B CN 110649688B
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Abstract
The invention discloses a wireless charging control system and method based on battery temperature detection, relates to the technical field of wireless charging, and solves the problems that a secondary side circuit with a battery protection function in a wireless charging control system is relatively complex in structure and relatively high in circuit cost. The invention discloses a wireless charging control system which comprises a primary charging platform module and a secondary side electricity taking module, wherein the primary charging platform module is provided with a power adjusting module and a control unit, a battery is also provided with a temperature detecting module, and the control unit controls the output power of the power adjusting module according to battery temperature data detected by the temperature detecting module, so that the circuit structure of the secondary side electricity taking module can be simplified while the secondary side battery is protected, the arrangement of a secondary side power adjusting control circuit and a voltage and current detecting circuit is reduced, the circuit structure is simple, and the control is convenient.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a wireless charging control system and method based on battery temperature detection.
Background
Along with the development of wireless charging technology, the application of the wireless charging system is more and more extensive, the primary side and the secondary side of a common wireless charging system are both provided with controllers, the primary side controller is mainly used for realizing high-frequency inversion and adjustment of wireless transmission power, and the secondary side controller is mainly used for realizing the detection of charging voltage and charging current, so that the protection of a rechargeable battery is realized. But the disadvantages are: the secondary side circuit structure is relatively complex, the circuit cost is relatively high, and the requirements of partial application products are not met.
Disclosure of Invention
In view of the above disadvantages, the present invention provides a wireless charging control system and method based on battery temperature detection, which solves the problems of relatively complex secondary side circuit structure and relatively high circuit cost in the wireless charging control system, wherein the secondary side circuit structure has a battery protection function.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
a wireless charging control system based on battery temperature detection comprises a primary charging platform and a secondary electricity taking module, wherein the primary charging platform is electrically connected with a transmitting coil, and a power adjusting module in the primary charging platform is electrically connected with a control unit; the secondary side electricity taking module is electrically connected with the pickup coil, a secondary side compensation circuit, a rectification filter circuit and an overcurrent and overvoltage protection circuit in the secondary side electricity taking module are sequentially and electrically connected, the overcurrent and overvoltage protection circuit is electrically connected with a battery, the transmitting coil is wirelessly connected with the pickup coil, a temperature detection module is arranged on the battery, and the control unit receives battery temperature data detected by the temperature detection module and then processes the battery temperature data and controls the output power of the power regulation module.
Furthermore, the temperature detection module is a wireless temperature sensor and is in wireless connection with the control unit.
Further, a wireless charging control method of the control unit based on battery temperature detection includes the steps of:
s1: three sequentially increasing temperature thresholds T1, T2 and T3 are arranged in a control unit; (ii) a
S2: the temperature detection module detects the battery temperature T0 and transmits the battery temperature T0 to the control unit of the primary charging platform;
s3: the control unit adjusts the output power through a duty cycle, wherein:
when T0 is less than T1, the control unit increases the duty ratio of the power regulation module in sequence according to the first unit quantity;
when T1 is less than or equal to T0 and less than T2, the control unit increases the duty ratio of the power regulation module according to a second unit quantity;
when T2 is less than or equal to T0 and less than T3, the control unit reduces the duty ratio of the power regulation module in sequence according to a third unit quantity;
when T3 is smaller than T0, the control unit reduces the duty ratio of the power regulation modules in sequence according to the fourth unit amount acceleration rate;
the first unit amount is greater than the second unit amount and the third unit amount is less than the fourth unit amount.
Further, in the step S1, the battery temperature is detected by a wireless temperature sensor to obtain data, and the data is wirelessly transmitted to the control unit of the primary charging platform.
Further, the three sequentially increasing temperature thresholds are T1=40 ℃, T2=50 ℃, T3=60 ℃. .
Compared with the prior art, the invention has the beneficial effects that:
through the setting that increases temperature detection module, can only need detect through the battery temperature and spread into the control unit and can adjust the charging power on primary side to make the secondary limit get the circuit structure of electric module and simplify when realizing the protection of secondary limit battery, reducible secondary limit gets the setting of electric module's secondary limit power control regulating circuit and voltage current detection circuit, make circuit structure simple, control is convenient.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a system in accordance with an embodiment of the present invention;
fig. 2 is a flow chart illustrating a system control method according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
As shown in fig. 1, a wireless charging control system based on battery temperature detection includes a primary charging platform and a secondary power-taking module, wherein a soft start control circuit, a rectification filter module, a power regulation module, a high-frequency inverter module and a primary resonant circuit in the primary charging platform are electrically connected in sequence, the primary charging platform is electrically connected with a transmitting coil, and the power regulation module in the primary charging platform is electrically connected with a control unit. The secondary side electricity-taking module is electrically connected with the pickup coil, a secondary side compensation circuit, a rectification filter circuit and an overcurrent and overvoltage protection circuit in the secondary side electricity-taking module are sequentially and electrically connected, the overcurrent and overvoltage protection circuit is electrically connected with the battery, and the transmitting coil is wirelessly connected with the pickup coil. The battery is provided with a temperature detection module, the control unit receives battery temperature data detected by the temperature detection module and then processes the battery temperature data and controls the output power of the power regulation module, and the temperature detection module is a wireless temperature sensor and is in wireless connection with the control unit.
The power taking device of the primary charging platform acquires a power frequency alternating current power supply, the input end of the soft start control module obtains power through the power taking device, the power is converted into a stable direct current power supply through the rectifying and filtering module after passing through the soft start control module, the stable direct current power supply is converted into a high-frequency inversion current after passing through the power adjusting module, the high-frequency inversion current is converted into a high-frequency inversion current after passing through the primary resonant circuit, wireless energy is transmitted outwards through the transmitting coil after being resonated, the secondary power taking module acquires wireless energy through the pickup coil and charges a battery after sequentially passing through the secondary compensation circuit, the rectifying and filtering circuit and the overcurrent and overvoltage protection circuit, the wireless temperature detection module is arranged on the battery, the wireless temperature detection module adopts a wireless temperature sensor and is connected with the control unit of the primary power adjusting module, and the control unit adjusts the wireless charging power according to the temperature change condition of the battery to ensure the safe charging of the battery.
As shown in fig. 2, in a specific implementation, the control method of the system includes the following steps:
s1: setting three sequentially increasing temperature thresholds T1, T2 and T3 in a control unit;
s2: the temperature detection module detects the temperature T0 of the battery and transmits the temperature to the control unit of the primary charging platform
S3: a step of the control unit adjusting the output power by a duty cycle, wherein:
when T0< T1, the control unit increases the duty cycle of the power regulating modules in sequence by a first unit amount, i.e. PWMP = PWMP +10, and typically increments from 0;
when T1 is larger than or equal to T0 and smaller than T2, the control unit increases the duty ratio of the power regulating module according to a second unit quantity, namely PWMP = PWMP +5;
when T2 is larger than or equal to T0 and smaller than T3, the control unit reduces the duty ratio of the power regulating module in sequence according to a third unit quantity, namely PWMP = PWMP-10;
when T3 is less than or equal to T0, the control unit reduces the duty ratio of the power regulating modules in sequence according to the fourth unit amount of speed increase, namely PWMP = PWMP-20; it can be seen that the first unit amount is greater than the second unit amount and the third unit amount is less than the fourth unit amount.
In combination with specific battery capacity and related parameters, the three sequentially increasing temperature thresholds T1=40 ℃, T2=50 ℃, and T3=60 ℃ in this embodiment.
The charging state of the battery can be fed back only based on the secondary wireless temperature sensor, the dynamic regulation and control of the charging process of the battery in the wireless charging system can be realized by utilizing the primary power regulation, the arrangement of a secondary power control regulation circuit and a voltage and current detection circuit of a secondary electricity taking module can be reduced, the secondary circuit cost is effectively reduced, and the safe charging of the battery is ensured.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A wireless charging control system based on battery temperature detection comprises a primary charging platform and a secondary electricity taking module, wherein the primary charging platform is electrically connected with a transmitting coil, and a power adjusting module in the primary charging platform is electrically connected with a control unit; the secondary side electricity-taking module is electrically connected with the pickup coil, a secondary side compensation circuit, a rectification filter circuit and an overcurrent and overvoltage protection circuit in the secondary side electricity-taking module are sequentially and electrically connected, and the overcurrent and overvoltage protection circuit is electrically connected with a battery; the transmitting coil is wirelessly connected with the pickup coil, and is characterized in that:
the battery is provided with a temperature detection module, and the control unit receives battery temperature data detected by the temperature detection module, processes the battery temperature data and controls the output power of the power regulation module;
a wireless charging control method of the control unit based on battery temperature detection comprises the following steps:
s1: setting three sequentially increasing temperature thresholds T1, T2 and T3 in a control unit;
s2: the temperature detection module detects the battery temperature T0 and transmits the battery temperature T0 to the control unit of the primary charging platform;
s3: a step of the control unit adjusting the output power by a duty cycle, wherein:
when T0< T1, the control unit sequentially increases the duty ratio of the power regulating module by a first unit amount, i.e., PWMP = PWMP +10, and increases from 0;
when T1 is larger than or equal to T0 and smaller than T2, the control unit increases the duty ratio of the power regulating module according to a second unit quantity, namely PWMP = PWMP +5;
when T2 is more than or equal to T0 and less than T3, the control unit reduces the duty ratio of the power regulating module in sequence according to a third unit quantity, namely PWMP = PWMP-10;
when T3 is less than or equal to T0, the control unit reduces the duty ratio of the power regulating modules in sequence according to the fourth unit amount of speed increase, namely PWMP = PWMP-20; the first unit amount is greater than the second unit amount and the third unit amount is less than the fourth unit amount.
2. The wireless charging control system based on battery temperature detection according to claim 1, wherein: the temperature detection module is a wireless temperature sensor and is in wireless connection with the control unit.
3. The wireless charging control system based on battery temperature detection according to claim 1, characterized in that: and S2, detecting the temperature of the battery through a wireless temperature sensor to obtain data, and transmitting the data to the control unit of the primary charging platform through wireless transmission.
4. The wireless charging control system based on battery temperature detection according to claim 1, wherein: three sequentially increasing temperature thresholds are T1=40 ℃, T2=50 ℃, T3=60 ℃.
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