CN110649688B - Wireless charging control system and method based on battery temperature detection - Google Patents

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 of a relatively complex structure and relatively high circuit cost of a secondary side circuit in the wireless charging control system that has the function of protecting the battery. The wireless charging control system disclosed in the present invention includes a primary side charging platform module and a secondary side power taking module. The primary side charging platform module is provided with a power adjustment module and a control unit, and a temperature detection module is also provided on the battery. The detected battery temperature data controls the output power of the power regulation module, so as to realize the protection of the battery on the secondary side and simplify the circuit structure of the power-taking module on the secondary side, reducing the power regulation control circuit and the voltage and current detection circuit on the secondary side. The setting makes the circuit structure simple and easy to control.

Description

A wireless charging control system and method based on battery temperature detection

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 technique

With the development of wireless charging technology, its application is becoming more and more extensive. Common wireless charging systems are equipped with controllers on both the primary side and the secondary side. The primary side controller is mainly used to realize high-frequency inverter and wireless transmission power adjustment. The secondary side controller is mainly used to realize the detection of charging voltage and charging current, so as to realize the protection of the rechargeable battery. However, its disadvantages are: the structure of the secondary side circuit is relatively complex, and the circuit cost is relatively high, which does not meet the needs of some application products.

Contents of the invention

In view of the above deficiencies, the present invention provides a wireless charging control system and method based on battery temperature detection, which solves the problem of relatively complex structure and relatively high circuit cost of the secondary side circuit in the wireless charging control system, which has the function of protecting the battery.

In order to achieve the above object, the concrete technical scheme adopted in the present invention is as follows:

A wireless charging control system based on battery temperature detection, including a primary side charging platform and a secondary side power-taking module, the primary side charging platform is electrically connected to a transmitting coil, and a power adjustment module and a control unit in the primary side charging platform Electrically connected: the secondary power-taking module is electrically connected to the pickup coil, the secondary compensation circuit, the rectification filter circuit and the over-current and over-voltage protection circuit in the secondary-side power-taking module are electrically connected in sequence, and the over-current and over-voltage The protection circuit is electrically connected to the battery, the transmitting coil is wirelessly connected to the pickup coil, the battery is provided with a temperature detection module, and the control unit receives the battery temperature data detected by the temperature detection module to process and control The output power of the power regulation module.

Further, the temperature detection module is a wireless temperature sensor, which is wirelessly connected with the control unit.

Further, a wireless charging control method based on battery temperature detection of the control unit includes the following steps:

S1: Set three sequentially increasing temperature thresholds T1, T2, T3 in the control unit;

S2: The temperature detection module detects the battery temperature T0 and transmits it to the control unit of the primary charging platform;

S3: The control unit adjusts the output power through the duty cycle, where:

When T0<T1, the control unit sequentially increases the duty cycle of the power regulation module according to the first unit amount;

When T1≤T0<T2, the control unit increases the duty cycle of the power regulation module according to the second unit amount;

When T2≤T0<T3, the control unit sequentially reduces the duty cycle of the power regulation module according to the third unit amount;

When T3<T0, the control unit sequentially reduces the duty cycle of the power regulation module according to the fourth unit growth rate;

The first unit quantity is greater than the second unit quantity, and the third unit quantity is smaller than the fourth unit quantity.

Further, in step S1, the temperature of the battery is detected by a wireless temperature sensor to obtain data, and the data is transmitted wirelessly to the control unit of the primary-side charging platform.

Further, the three successively increasing temperature thresholds are T1=40°C, T2=50°C, and T3=60°C. .

Compared with prior art, the beneficial effect of the present invention is:

By increasing the setting of the temperature detection module, the charging power of the primary side can be adjusted only through the battery temperature detection and transmitted to the control unit, so as to realize the protection of the battery on the secondary side and simplify the circuit structure of the power-taking module on the secondary side , can reduce the setting of the secondary side power control regulation circuit and the voltage and current detection circuit of the secondary side power taking module, so that the circuit structure is simple and the control is convenient.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment, in the accompanying drawing:

Fig. 1 is a schematic diagram of a system circuit in a specific embodiment of the present invention;

Fig. 2 is a schematic flowchart of a system control method in a specific embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the invention.

As shown in Figure 1, a wireless charging control system based on battery temperature detection includes a primary-side charging platform and a secondary-side power-taking module, a soft-start control circuit in the primary-side charging platform, a rectification and filtering module, a power adjustment module, a high The frequency inverter module is electrically connected to the primary side resonant circuit in turn, the primary side charging platform is electrically connected to the transmitting coil, and the power adjustment module in the primary side charging platform is electrically connected to the control unit. The secondary power-taking module is electrically connected to the pick-up coil, the secondary compensation circuit, the rectification filter circuit and the over-current and over-voltage protection circuit in the secondary-side power-taking module are electrically connected in turn, the over-current and over-voltage protection circuit is electrically connected to the battery, and the transmitting coil Connects wirelessly with pickup coils. The battery is provided with a temperature detection module, and the control unit processes the battery temperature data detected by the temperature detection module and controls the output power of the power regulation module. The temperature detection module is a wireless temperature sensor and is wirelessly connected to the control unit.

The power-taking device of the original side charging platform obtains power-frequency AC power. The input terminal of the soft-start control module takes power through the power-taking device, passes through the soft-start control module, and converts it into a stable DC power supply by the rectifier and filter module. The high-frequency inverter module converts the high-frequency inverter current into high-frequency inverter current, and then transmits wireless energy through the transmitting coil after resonating with the primary side resonant circuit. The battery is charged after the rectification and filtering circuit and the overcurrent and overvoltage protection circuit. A wireless temperature detection module is installed on the battery. The temperature detection module uses a wireless temperature sensor and is connected to the control unit of the primary side power regulation module. Adjust the wireless charging power according to the temperature change to ensure its safe charging.

As shown in Figure 2, during specific implementation, the control method of the above-mentioned system includes the following steps:

S1: Set three sequentially increasing temperature thresholds T1, T2, T3 in the control unit;

S2: The temperature detection module detects the battery temperature T0 and transmits it to the control unit of the primary charging platform

S3: a step in which the control unit adjusts the output power through the duty cycle, wherein:

When T0<T1, the control unit sequentially increases the duty cycle of the power regulation module according to the first unit amount, that is, PWMP=PWMP+10, and usually increases from 0;

When T1≤T0<T2, the control unit increases the duty cycle of the power regulation module according to the second unit amount, that is, PWMP=PWMP+5;

When T2≤T0<T3, the control unit sequentially reduces the duty cycle of the power regulation module according to the third unit amount, that is, PWMP=PWMP-10;

When T3≤T0, the control unit decreases the duty cycle of the power regulation module sequentially according to the fourth unit increase rate, that is, PWMP=PWMP-20; it can be seen that the first unit amount is greater than the second unit amount, and the third The unit amount is less than the fourth unit amount.

Combined with the specific battery capacity and related parameters, in this embodiment, three successively increasing temperature thresholds are T1=40°C, T2=50°C, and T3=60°C.

The present invention can feed back the charging state of the battery only based on the wireless temperature sensor of the secondary side, and can realize the dynamic control of the battery charging process in the wireless charging system by using the power adjustment of the primary side, and can reduce the power control and adjustment of the secondary side of the power taking module of the secondary side The setting of the circuit and the voltage and current detection circuit can effectively reduce the cost of the secondary side circuit, and also ensure the safe charging of the battery.

Embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementations, and the above-mentioned specific implementations are only illustrative, rather than restrictive, and those of ordinary skill in the art will Under the enlightenment of the present invention, many forms can also be made without departing from the gist of the present invention and the protection scope of the claims, and these all belong to the protection of the present invention.

Claims (4)

1. A wireless charging control system based on battery temperature detection, comprising a primary side charging platform and a secondary side power-taking module, the primary side charging platform is electrically connected to the transmitting coil, the power adjustment module and the secondary side charging platform in the primary side charging platform The control unit is electrically connected; the secondary power-taking module is electrically connected to the pickup coil, and the secondary compensation circuit, rectification and filtering circuit and overcurrent and overvoltage protection circuit in the secondary power-taking module are electrically connected in sequence, and the overcurrent The overvoltage protection circuit is electrically connected to the battery; the transmitting coil is wirelessly connected to the pickup coil, characterized in that: The battery is provided with a temperature detection module, and the control unit processes the battery temperature data detected by the temperature detection module and controls the output power of the power regulation module; A wireless charging control method based on battery temperature detection of the control unit includes the following steps: S1: Set three sequentially increasing temperature thresholds T1, T2, T3 in the control unit; S2: The temperature detection module detects the battery temperature T0 and transmits it to the control unit of the primary charging platform; S3: a step in which the control unit adjusts the output power through the duty cycle, wherein: When T0<T1, the control unit sequentially increases the duty cycle of the power regulation module according to the first unit amount, that is, PWMP=PWMP+10, and increases from 0; When T1≤T0<T2, the control unit increases the duty cycle of the power regulation module according to the second unit amount, that is, PWMP=PWMP+5; When T2≤T0<T3, the control unit sequentially reduces the duty cycle of the power regulation module according to the third unit amount, that is, PWMP=PWMP-10; When T3≤T0, the control unit sequentially reduces the duty cycle of the power regulation module according to the fourth unit increase rate, that is, PWMP=PWMP-20; the first unit amount is greater than the second unit amount, and the third unit amount is smaller than the first unit amount Four units. 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, which is wirelessly connected to the control unit. 3. The wireless charging control system based on battery temperature detection according to claim 1, characterized in that: step S2 detects the battery temperature through a wireless temperature sensor to obtain data, and transmits the data wirelessly to the control unit of the primary-side charging platform. 4. The wireless charging control system based on battery temperature detection according to claim 1, characterized in that: three sequentially increasing temperature thresholds are T1=40°C, T2=50°C, and T3=60°C.

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