Search

CN-122001404-A - Wireless charging signal modulation circuit, method, chip and electronic equipment

CN122001404ACN 122001404 ACN122001404 ACN 122001404ACN-122001404-A

Abstract

The application provides a wireless charging signal modulation circuit, a wireless charging signal modulation method, a wireless charging signal modulation chip and electronic equipment, which comprise an analog circuit and a digital circuit, wherein the digital circuit comprises a configuration register circuit, an M-sequence buffer circuit, a data buffer circuit, a first exclusive-or operation circuit and a coding circuit, the configuration register circuit configures a first target M-sequence into the M-sequence buffer circuit and configures data to be transmitted to the data buffer circuit, the data buffer circuit processes the data to be transmitted to output target transmission data, each bit of the data is subjected to spread spectrum coding according to the length of the first target M-sequence to obtain a plurality of target spread spectrum coding data, the first exclusive-or operation circuit carries out bit exclusive-or operation on each target spread spectrum coding data and the first target M-sequence to obtain a first target operation result, and the coding circuit carries out Manchester coding on the first target operation result to obtain first target coding data so as to control a modulation capacitor. The modulation mode signal is stable and the error rate is lower.

Inventors

  • FANG LIANGJIE

Assignees

  • 珠海楠欣半导体科技有限公司

Dates

Publication Date
20260508
Application Date
20260210

Claims (10)

  1. 1. The wireless charging signal modulation circuit is characterized by being applied to a wireless charging receiving end and comprises an analog circuit and a digital circuit, wherein the analog circuit is respectively and electrically connected with a secondary coil of the wireless charging receiving end, a modulation capacitor of the wireless charging receiving end and the digital circuit; The digital circuit comprises a configuration register circuit, an M sequence buffer circuit, a data buffer circuit, a first exclusive-or operation circuit and a coding circuit, wherein the configuration register is respectively and electrically connected with the M sequence buffer circuit and the data buffer circuit, a first input end of the first exclusive-or operation circuit is electrically connected with the M sequence buffer circuit, a second input end of the first exclusive-or operation circuit is electrically connected with the data buffer circuit, and an output end of the first exclusive-or operation circuit is electrically connected with the coding circuit; The analog circuit is used for detecting the voltages at two ends of the secondary coil to obtain an alternating voltage signal, and detecting zero crossing points of the alternating voltage signal to obtain a digital clock driving signal so as to enable the digital circuit; the configuration register circuit is used for configuring a first target M sequence into the M sequence buffer circuit and configuring data to be transmitted to the data buffer circuit; the data buffer circuit is used for storing the data to be transmitted, adding a packet head and a packet tail when the data to be transmitted is read, and outputting target transmission data; performing spread spectrum coding on each bit in the target transmission data to obtain a plurality of target spread spectrum coded data, wherein the length of each target spread spectrum coded data is the same as the length of the first target M sequence; The first exclusive-or operation circuit is used for performing bitwise exclusive-or operation on each target spread spectrum coded data and the first target M sequence respectively to obtain a first target operation result; the encoding circuit is used for performing Manchester encoding on the first target operation result to obtain first target encoded data, and the first target encoded data is used for controlling the modulation capacitor so as to modulate the alternating voltage signal.
  2. 2. The wireless charging signal modulation circuit of claim 1, wherein the digital circuit further comprises a linear feedback shift register circuit, a second exclusive-or operation circuit, and a multiplexer; The linear feedback shift register circuit is respectively and electrically connected with the first input end of the second exclusive-or operation circuit and the configuration register circuit, the second input end of the second exclusive-or operation circuit is electrically connected with the data buffer circuit, the output end of the second exclusive-or operation circuit is electrically connected with the first input end of the multiplexer, the second input end of the multiplexer is electrically connected with the output end of the first exclusive-or operation circuit, the output end of the multiplexer is electrically connected with the encoding circuit, the control end of the multiplexer is electrically connected with the configuration register circuit, and the output end of the encoding circuit is electrically connected with the analog circuit; the configuration register circuit is further configured to configure the linear feedback shift register circuit with a characteristic polynomial; the linear feedback shift register circuit is used for generating a second target M sequence according to the characteristic polynomial, and the length of the second target M sequence is the same as that of the first target M sequence; the second exclusive-or operation circuit is used for performing bitwise exclusive-or operation on each target spread spectrum coded data and the second target M sequence respectively to obtain a second target operation result; the multiplexer is used for selecting the first target operation result and the second target operation result according to a control signal accessed by the control terminal of the multiplexer to obtain a target operation result, wherein the target operation result is the first target operation result or the second target operation result; The encoding circuit is also used for performing Manchester encoding on the target operation result to obtain second target encoded data, and the second target encoded data is used for controlling the modulation capacitor so as to realize modulation of the alternating voltage signal.
  3. 3. The wireless charging signal modulation circuit of claim 2, wherein the analog circuit comprises a signal receiving circuit, a zero crossing detection circuit, and a modulation switching circuit; The signal receiving circuit is respectively and electrically connected with the secondary coil of the wireless charging receiving end and the zero-crossing detection circuit, and the zero-crossing detection circuit is electrically connected with the digital circuit; the signal receiving circuit is used for detecting the voltages at two ends of the secondary coil to obtain the alternating voltage signal; the zero-crossing detection circuit is used for detecting zero crossing points of the alternating voltage signals to obtain the digital clock driving signals; The modulation switch circuit is used for controlling the modulation capacitor according to the first target coding data or the second target coding data so as to realize modulation of the alternating voltage signal.
  4. 4. The wireless charging signal modulation circuit of claim 2, wherein the data buffer circuit comprises a data storage circuit, a data supplementation circuit, and a data spread spectrum encoding circuit; The data storage circuit is electrically connected with the configuration register circuit, the data storage circuit is electrically connected with the data supplementing circuit, the data supplementing circuit is electrically connected with the data spread spectrum coding circuit, and the data spread spectrum coding circuit is electrically connected with the second input end of the first exclusive-or operation circuit and the second input end of the second exclusive-or operation circuit respectively; The data storage circuit is used for storing the data to be transmitted; The data supplementing circuit is used for adding a packet head and a packet tail when the data to be transmitted are read and outputting target transmission data; The data spread spectrum coding circuit is used for performing spread spectrum coding on each bit in the target transmission data to obtain a plurality of target spread spectrum coded data.
  5. 5. The wireless charging signal modulation circuit of claim 4, wherein the data storage circuit has a storage capacity of 4 bytes, the first target M-sequence is 16 bits or 32 bits long, and the second target M-sequence is 16 bits or 32 bits long.
  6. 6. The wireless charging signal modulation circuit of claim 1, wherein the configuration register circuit is further configured to turn the wireless charging signal modulation circuit on or off.
  7. 7. A wireless charging signal modulation method, wherein the wireless charging signal modulation method is applied to the wireless charging signal modulation circuit according to claim 2, the wireless charging signal modulation method comprising: Detecting voltages at two ends of the secondary coil to obtain an alternating voltage signal, and detecting zero crossing points of the alternating voltage signal to obtain a digital clock driving signal so as to enable a digital circuit; Configuring a first target M sequence into an M sequence buffer circuit, and configuring data to be transmitted to a data buffer circuit; The method comprises the steps of storing data to be transmitted, adding a packet header and a packet tail when the data to be transmitted is read, and outputting target transmission data, and performing spread spectrum coding on each bit in the target transmission data to obtain a plurality of target spread spectrum coded data, wherein the length of each target spread spectrum coded data is the same as the length of a first target M sequence; Performing bitwise exclusive OR operation on each target spread spectrum coded data and the first target M sequence respectively to obtain a first target operation result; and performing Manchester encoding on the first target operation result to obtain first target encoded data, wherein the first target encoded data is used for controlling the modulation capacitor so as to realize modulation of the alternating voltage signal.
  8. 8. The wireless charging signal modulation method according to claim 7, characterized in that the wireless charging signal modulation method further comprises: Configuring a characteristic polynomial for a linear feedback shift register circuit; Generating a second target M sequence according to the characteristic polynomial, wherein the length of the second target M sequence is the same as that of the first target M sequence; Performing bit exclusive OR operation on each target spread spectrum coded data and the second target M sequence respectively to obtain a second target operation result; Selecting the first target operation result and the second target operation result to obtain a target operation result, wherein the target operation result is the first target operation result or the second target operation result; And performing Manchester encoding on the target operation result to obtain second target encoded data, wherein the second target encoded data is used for controlling the modulation capacitor so as to modulate the alternating voltage signal.
  9. 9. A chip comprising the wireless charging signal modulation circuit according to any one of claims 1 to 6.
  10. 10. An electronic device comprising a chip as claimed in claim 9.

Description

Wireless charging signal modulation circuit, method, chip and electronic equipment Technical Field The present application relates to the field of wireless communications technologies, and in particular, to a wireless charging signal modulation circuit, a wireless charging signal modulation method, a wireless charging signal modulation chip, and an electronic device. Background In a wireless charging system, a wireless charging transmitting Terminal (TX) and a wireless charging receiving terminal (RX) are generally included, the wireless charging transmitting terminal is installed in a wireless charger, and the wireless charging receiving terminal is integrated in an electronic device to be charged. When the wireless charger is powered on, the primary coil of the wireless charging transmitting end can generate an alternating magnetic field under the action of alternating current, when the wireless charging receiving end is in the range of the magnetic field, induction current can be generated due to electromagnetic induction phenomenon, and after the treatment such as rectification, filtering and voltage stabilization of an internal circuit, electric energy is transmitted to the battery, so that the electronic equipment is charged. When the wireless charging system is applied to the field of mobile phone charging, a wireless charging transmitting end is usually arranged in a wireless charging base, and a wireless charging receiving end is arranged in a mobile phone. For wireless communication between a wireless charging base and a mobile phone, information is generally sent to a wireless charging transmitting end through a wireless charging receiving end, and an Amplitude keying (Amplitude SHIFT KEYING, ASK) modulation mode is generally adopted for the information. The ASK modulation mode is a common communication mode, information is transmitted by changing the amplitude of a signal, for example, the information is transmitted by controlling the amplitude of coil current to change, the coil current is greatly jumped in the realization process, so that charging power is unstable, in addition, the ASK modulation mode is used for controlling whether a capacitor is connected into a loop or not so as to control the amplitude of the coil current to change, noise can be generated in the connection process of the capacitor due to vibration of the capacitor, the overvoltage protection (Over Voltage Protection, OVP) function or the overcurrent protection (Over Current Protection, OCP) function can be triggered by a system error in the large-amplitude jump process of the voltage or the current of the coil, and the ASK modulation mode is easily disturbed in the transmission and decoding processes, so that the amplitude of the coil current is changed, the coil current is abnormal in the decoding process, and error rate is high. How to provide a modulation mode applied to wireless communication in a wireless charging system, so that signals cannot jump greatly, and the error rate of signal transmission is lower is an important problem to be solved. Disclosure of Invention The application provides a wireless charging signal modulation circuit, a wireless charging signal modulation method, a wireless charging signal modulation chip and electronic equipment, and provides a wireless communication modulation mode, so that signals cannot be jumped greatly, and the error rate of signal transmission is lower. The application provides a wireless charging signal modulation circuit which is applied to a wireless charging receiving end, and comprises an analog circuit and a digital circuit, wherein the analog circuit is respectively and electrically connected with a secondary coil of the wireless charging receiving end, a modulation capacitor of the wireless charging receiving end and the digital circuit; The digital circuit comprises a configuration register circuit, an M sequence buffer circuit, a data buffer circuit, a first exclusive-or operation circuit and a coding circuit, wherein the configuration register is respectively and electrically connected with the M sequence buffer circuit and the data buffer circuit, a first input end of the first exclusive-or operation circuit is electrically connected with the M sequence buffer circuit, a second input end of the first exclusive-or operation circuit is electrically connected with the data buffer circuit, and an output end of the first exclusive-or operation circuit is electrically connected with the coding circuit; The analog circuit is used for detecting the voltages at two ends of the secondary coil to obtain an alternating voltage signal, and detecting zero crossing points of the alternating voltage signal to obtain a digital clock driving signal so as to enable the digital circuit; the configuration register circuit is used for configuring a first target M sequence into the M sequence buffer circuit and configuring data to be transmitted to the data buffer circuit; the data