Low-power lithium battery charging device with private protocol

Abstract

The invention discloses a low-power lithium battery charging device with a private protocol, and the device comprises a half-bridge rectification circuit and a private protocol module which are electrically connected with a wireless charging coil, the output end of the half-bridge rectification circuit is electrically connected with a constant voltage circuit, and the constant voltage circuit supplies power to the private protocol module and charges a battery; the protocol content of the private protocol module comprises 8-bit data bits, 2-bit data bits are adopted to transmit the voltage difference range between the rectified voltage Vrect output by the half-bridge rectifying circuit and the direct-current power supply voltage Vout output by the constant-voltage circuit, 2-3-bit data bits are adopted to transmit the direct-current power supply voltage Vout output by the constant-voltage circuit, and the voltage difference range between the rectified voltage Vrect output by the half-bridge rectifying circuit and the direct-current power supply voltage Vout output by the constant-voltage circuit and the direct-current power supply voltage Vout output by the constant-voltage circuit is within the range of 8-bit data bits. And transmitting the self-defined data by adopting data bits of 3-4 bits. The scanning power consumption of the transmitting end is saved, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of low-power charging devices, and in particular to a low-power lithium battery charging device with a private protocol. Background Art

[0002] Existing dedicated wireless charging ICs are basically aimed at mobile phone charging applications. There is no targeted design for low-power and low-energy lithium battery products. The cost of matching existing wireless charging devices for such products is relatively high.

[0003] The current wireless charging IC on the market uses a magnetic induction rectifier bridge and transmits a large amount of communication data (power communication, ID identification) through the QI protocol. Its peripherals are complex, the protocol is complex, and the cost is too high for low-power (less than 5w) products. For example: the complexity of the QI protocol will lead to a large chip size and require a long period of scanning, which will cause the transmitter to be unable to significantly reduce the transmission power. For low-power market applications, it cannot meet the strict power consumption requirements (such as: the US DOE energy consumption certification). In addition, the QI protocol is mainly for constant voltage 5V output and not for direct charging of the battery.

[0004] Therefore, there is an urgent need for a low-power lithium battery charging device with a private protocol that can solve one or more of the above problems. Summary of the invention

[0005] In order to solve one or more problems existing in the prior art, the present invention provides a low-power lithium battery charging device with a private protocol. The technical solution adopted by the present invention to solve the above problems is: the device comprises: a half-bridge rectifier circuit and a private protocol module electrically connected to a wireless charging coil, the output end of the half-bridge rectifier circuit is electrically connected to a constant voltage circuit, and the constant voltage circuit supplies power to the private protocol module and charges the battery;

[0006] The protocol content of the private protocol module includes 8 bits of data, wherein 2 bits of data are used to transmit the voltage difference range between the rectified voltage Vrect output by the half-bridge rectifier circuit and the DC power supply voltage Vout output by the constant voltage circuit, 2 to 3 bits of data are used to transmit the DC power supply voltage Vout output by the constant voltage circuit, and 3 to 4 bits of data are used to transmit custom data.

[0007] In some embodiments, the voltage difference range is: the voltage difference between the DC voltage Vrect and the rectified voltage Vrect is greater than a first set value or less than a second set value, for example: the first set value is 0.5V, and the second set value is 0.3V.

[0008] In some embodiments, when transmitting the DC supply voltage Vout, the DC supply voltage Vout is first segmented, and then the segmented data is transmitted using 2 to 3 bits of data, for example: the DC supply voltage Vout is segmented into 4 to 8 segments.

[0009] The technical effect achieved by the present invention is: the above-mentioned device can meet the needs of simple low-power applications (≤5w), allowing the transmitting end to adjust the transmitting power in time, and then realize the execution of low-power trickle charging, normal power charging and full charging on the receiving end; due to the use of 8-bit data bits, the transmitting end can detect the status of the receiving end with a shorter transmitting waveform (8.5MS), saving scanning power consumption and achieving energy saving; relative to traditional QI protocol charging, this protocol only needs 8.5MS to complete the communication content, while the QI protocol requires at least 25MS, which enables the present application to greatly shorten the length of the transmitting scanning wave and achieve energy saving and consumption reduction at the charger end. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the circuit of the present invention.

[0011] exist Figure 1 In: 1. Private protocol module 2. Half-bridge rectifier circuit 3. Constant voltage circuit. DETAILED DESCRIPTION

[0012] In order to make the above-mentioned objects, features and advantages of the present invention more understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from this description, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0013] The present invention discloses a low-power lithium battery charging device with a private protocol, combined with Figure 1 As shown, the device includes: a half-bridge rectifier circuit 2 and a private protocol module 1 electrically connected to the wireless charging coil, the output end of the half-bridge rectifier circuit 2 is electrically connected to a constant voltage circuit 3, and the constant voltage circuit 3 supplies power to the private protocol module 1 and charges the battery (single / double lithium battery);

[0014] The protocol content of the private protocol module 1 includes 8 bits of data, wherein 2 bits of data are used to transmit the voltage difference range between the rectified voltage Vrect output by the half-bridge rectifier circuit 2 and the DC power supply voltage Vout output by the constant voltage circuit 3, 2 to 3 bits of data are used to transmit the DC power supply voltage Vout output by the constant voltage circuit 3, and 3 to 4 bits of data are used to transmit custom data.

[0015] The circuit part of the device can be referred to Figure 1 As shown, the adjustment method of the protocol communication is: the private protocol module 1 uses the transistor Q4 to output the pulse signal, and changes the LC resonant frequency of the external receiving coil through the capacitor C3 in the line, thereby changing the load weight of the receiving end, and feeding back different current size codes to the transmitting end. After receiving the current information code, the transmitting end can decode to obtain the corresponding information and make corresponding control changes. The half-bridge rectifier circuit 2 and the constant voltage circuit 3 can be conventional circuits in the field, wherein the purpose of using the half-bridge rectifier circuit 2 is to simplify the peripheral circuit to reduce costs.

[0016] It should be noted that the private protocol module 1 can be a communication circuit or a protocol chip; the low-power lithium battery charging device with a private protocol of the present application can be packaged as a chip for use.

[0017] Specifically, the voltage difference range is: the voltage difference between the DC voltage Vrect and the rectified voltage Vrect is greater than the first set value or less than the second set value, for example: the first set value is 0.5V, the second set value is 0.3V, and the actual value can be adjusted according to demand. Furthermore, when transmitting the DC power supply voltage Vout, the DC power supply voltage Vout is first segmented, and then the segmented data is transmitted using 2 to 3 bits of data, for example: the DC power supply voltage Vout is segmented into 4 to 8 segments, and the actual number of segments can be adjusted according to demand.

[0018] The charger detects the state of the receiving end. For example, if the scan is fixed once every 1 second, the QI protocol requires at least 25MS of power output during scanning, and the device requires 8.5MS of power output during scanning. The power consumed when using the device is 34% of that when using the QI protocol.

[0019] In summary, the device can meet the needs of simple low-power applications (≤5w), allowing the transmitter to adjust the transmission power in time, and then realize the execution of low-power trickle charging, normal power charging and full charging on the receiving end; due to the use of 8-bit data bits, the transmitter can detect the status of the receiving end with a shorter transmission waveform (8.5MS), saving scanning power consumption and achieving energy saving; relative to traditional QI protocol charging, this protocol only needs 8.5MS to complete the communication content, while the QI protocol requires at least 25MS, which enables the present application to greatly shorten the length of the transmission scanning wave and achieve energy saving and consumption reduction at the charger end.

[0020] The above-described embodiments only express one or more implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A low-power lithium battery charging device with a private protocol, characterized in that: The device comprises: a half-bridge rectifier circuit and a private protocol module electrically connected to the wireless charging coil, wherein the output end of the half-bridge rectifier circuit is electrically connected to a constant voltage circuit, and the constant voltage circuit supplies power to the private protocol module and charges a battery; The protocol content of the private protocol module includes 8 bits of data, wherein 2 bits of data are used to transmit the voltage difference range between the rectified voltage Vrect output by the half-bridge rectifier circuit and the DC power supply voltage Vout output by the constant voltage circuit, 2 to 3 bits of data are used to transmit the DC power supply voltage Vout output by the constant voltage circuit, and 3 to 4 bits of data are used to transmit custom data.

2. The low-power lithium battery charging device with a private protocol according to claim 1, characterized in that: The voltage difference range is: the voltage difference between the DC voltage Vrect and the rectified voltage Vrect is greater than a first set value or less than a second set value.

3. The low-power lithium battery charging device with a private protocol according to claim 2, characterized in that: The first set value is 0.5V, and the second set value is 0.3V.

4. The low-power lithium battery charging device with a private protocol according to claim 1, characterized in that: When transmitting the DC power supply voltage Vout, the DC power supply voltage Vout is first segmented, and then the segmented data is transmitted using 2 to 3 bits of data.

5. The low-power lithium battery charging device with a private protocol according to claim 4, characterized in that: The DC supply voltage Vout is divided into 4 to 8 segments.

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