Wireless radio frequency communication system

Patent metadata

Field	Value
Publication number	US-10992327-B2
Application number	US-202016930659-A
Country	US
Kind code	B2
Filing date	Jul 16, 2020
Priority date	Sep 12, 2018
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A system comprises an antenna, a port converting device, an information transmission device, a shield case, and a reference voltage end; wherein the antenna, the port converting device, and the information transmission device are connected sequentially, and the information transmission device is disposed within the shield case, and both the shield case and the port converting device is connected with the reference voltage end; the antenna is configured for a conversion between a radio frequency signal and a single-ended signal; the port converting device is configured for a conversion between the single-ended signal and target differential mode signals; the information transmission device is configured to transmit and process the target differential mode signals; and parameters of components in the port converting device is determined according to a preset communication frequency and a voltage amplitude and phase of a differential mode signal.

First claim

What is claimed is:

1. A battery management system, comprising a battery monitoring unit and a battery controlling unit, wherein each of the battery monitoring unit and the battery controlling unit comprises a wireless radio frequency communication system, and wherein the wireless radio frequency communication system comprises an antenna, a port converting device, an information transmission device, a shield case, and a reference voltage end; wherein:
the antenna, the port converting device, and the information transmission device are connected sequentially, the information transmission device is disposed within the shield case, and both the shield case and the port converting device are connected with the reference voltage end;
the antenna is configured for a conversion between a radio frequency signal and a single-ended signal;
the port converting device is configured for a conversion between the single-ended signal and a target differential mode signal;
the information transmission device is configured to transmit and process the target differential mode signal; and
parameters of components in the port converting device are determined according to a preset communication frequency, and a voltage amplitude and phase of the target differential mode signal.

2. The battery management system of claim 1 , wherein the port converting device comprises a first inductor L 1 , a second inductor L 2 , a first capacitor C 1 , and a second capacitor C 2 ; wherein
a first end of the first inductor L 1 is connected with a first end of the second capacitor C 2 , a second end of the first inductor L 1 is connected with a first end of the first capacitor C 1 , a second end of the second capacitor C 2 is connected with a first end of the second inductor L 2 , and a second end of the first capacitor C 1 and a second end of the second inductor L 2 are connected with the reference voltage end; and
an inductance value of the first inductor L 1 , an inductance value of the second inductor L 2 , an capacitance value of the first capacitor C 1 , and an capacitance value of the second capacitor C 2 are determined according to a voltage amplitude and phase of an output signal of the second end of the first inductor L 1 , as well as a voltage amplitude and phase of an output signal of the second end of the second capacitor C 2 .

3. The battery management system of claim 1 , wherein the port converting device comprises a first LC serial-parallel network T 1 , a second LC serial-parallel network T 2 , a third LC serial-parallel network T 3 , and a fourth LC serial-parallel network T 4 ; wherein
a first end of the T 1 is connected with a first end of the T 2 , a second end of the T 1 is connected with a first end of the T 3 , a second end of the T 2 is connected with a first end of the T 4 , and a second end of the T 3 and a second end of the T 4 are connected with the reference voltage end;
the T 1 comprises at least one third inductor, and the T 2 comprises at least one third capacitor; and
the T 3 comprises at least one fourth capacitor, and the T 4 comprises at least one fourth inductor.

4. The battery management system of claim 1 , wherein the shield case is a metal case.

5. The battery management system of claim 1 , wherein the system further comprises: a pre-stage filtering device;
a first end of the pre-stage filtering device is connected with the antenna, and a second end of the pre-stage filtering device is connected with the port converting device; and
the pre-stage filtering device is configured to filter the single-ended signal.

6. The battery management system of claim 1 , wherein the information transmission device comprises a transmitting module and a receiving module;
the receiving module is connected with the port converting device, and configured to receive a first differential mode signal from the port converting device and convert the first differential mode signal into a first baseband signal; and
the transmitting module is connected with the port converting device, and configured to receive a second baseband signal, convert the second baseband signal into a second differential mode signal, and input the second differential mode signal to the port converting device.

7. The battery management system of claim 6 , wherein the system further comprises: a radio frequency controller connected with the information transmission device;
the radio frequency controller is configured to output the second baseband signal and control the transmitting module to output the second differential mode signal; and
the radio frequency controller is further configured to receive the first baseband signal and control the receiving module to receive the first differential mode signal.

8. The battery management system of claim 7 , wherein the receiving module comprises: a post-stage filtering sub-module, a low-noise amplifying sub-module, a demodulating sub-module, and a demodulation reference frequency signal generating sub-module that are connected sequentially,
a first end of the post-stage filtering sub-module is connected with the port converting device, a second end of the post-stage filtering sub-module is connected with a first end of the low-noise amplifying sub-module, a second end of the low-noise amplifying sub-module is connected with a first end of the demodulating sub-module, and a second end of the demodulating sub-module is connected with the radio frequency controller;
the post-stage filtering sub-module is configured to filter the first differential mode signal;
the low-noise amplifying sub-module is configured to perform a signal amplification on the filtered first differential mode signal to obtain a first amplified differential mode signal;
the demodulating sub-module is configured to demodulate the first amplified differential mode signal based on a received demodulation reference frequency signal to obtain the first baseband signal;
the demodulation reference frequency signal generating sub-module is configured to generate the demodulation reference frequency signal.

9. The battery management system of claim 8 , wherein the demodulation reference frequency signal generating sub-module comprises: a local oscillation signal generating unit, a first phase detecting unit, a first voltage-controlled oscillating unit, and a first frequency sampling unit; wherein
the local oscillation signal generating unit is connected with a first end of the first phase detecting unit, a second end of the first phase detecting unit is connected with a first end of the first voltage-controlled oscillating unit, a second end of the first voltage-controlled oscillating unit is connected with the demodulating sub-module, a first end of the first frequency sampling unit is connected with the first phase detecting unit, and a second end of the first frequency sampling unit is connected with a second end of the first voltage-controlled oscillating unit;
the first phase detecting unit is configured to receive a local oscillation frequency signal from the local oscillation signal generating unit and a first oscillation frequency signal from the first frequency sampling unit, determine a first phase difference between the local oscillation frequency signal and the first oscillation frequency signal, and output a first voltage signal corresponding to the first phase difference;
the first phase detecting unit is further configured to determine whether the first phase difference satisfies a first stable condition, wherein the first stable condition is that a number of consecutive occurrences of the first phase difference within a first preset phase difference threshold range reaches a first preset number threshold;
if the first stable condition

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Hou Yizhen
• Dan Zhimin
• Zhang Wei
• Luo Jiechao
• Lu Wenbin
• Xu Jia
• Yu Teng

Classifications

• H04B1/38

  Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving · CPC title

• H04B1/0078

  with a common intermediate frequency amplifier for the different intermediate frequencies, e.g. when using switched intermediate frequency filters · CPC title

• H03H7/0115

  comprising only inductors and capacitors (H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence) · CPC title

• H01Q1/526

  Electromagnetic shields · CPC title

• H04B1/1018

  noise filters connected between the power supply and the receiver · CPC title