Wireless connector system
Various embodiments of a wireless connector system are described. The system has a transmitter module and a receiver module that are configured to wirelessly transmit electrical energy and/or data via near field magnetic coupling. The wireless connector system is designed to increase the amount of wirelessly transmitted electrical power over a greater separation distance. The system is configured with various sensing circuits that alert the system to the presence of the receiver module to begin transfer of electrical power as well as undesirable objects and increased temperature that could interfere with the operation of the system. The wireless connector system is a relatively small footprint that is designed to be surface mounted.
1 . A method of operating a transmitter module configured for wireless power transfer within a given frequency range, the transmitter module comprising (i) a transmitter antenna and (ii) control circuitry, the method comprising:
detecting an impedance, via the transmitter antenna, wherein a given impedance range comprises values for the impedance that indicate that any receiver module configured for wireless power transfer within the given frequency range is in a near field of the transmitter module;
based on the impedance, determining a voltage level that is indicative of the impedance detected, via the transmitter antenna, wherein a given voltage level range comprises values for the voltage level that correlate with the values of the given impedance range;
based on if the voltage level is within the given voltage level range, sense whether any receiver module configured for wireless power transfer within the given frequency range is in the near field of the transmitter module;
based on the voltage level, determining whether the voltage level has changed by a threshold amount;
based on determining whether the voltage level has changed by the threshold amount, determining an activation state for the transmitter antenna whereby:
if the voltage level is not determined to have changed by the threshold amount, determining that the activation state of the transmitter antenna's wireless transmission of electrical energy need not be changed;
if the voltage level is determined to have increased by the threshold amount, determining that the activation state of transmitter antenna's wireless transmission of electrical energy is to be changed from deactivated to activated; or
if the voltage level is determined to have decreased by the threshold amount, determining that the activation state of transmitter antenna's wireless transmission of electrical energy is to be changed from activated to deactivated; and
based on the activation state, causing the transmitter antenna to engage in wireless transmission of electrical energy via near-field magnetic coupling.
2 . The method of claim 1 , wherein the transmitter module further comprises an envelope detector that comprises first and second resistors that are electrically connected in series to one another, and
wherein determining the voltage level that is indicative of the impedance detected comprises determining, as the voltage level, a voltage level at a node residing between the first and second resistors.
3 . The method of claim 2 , wherein the envelope detector further comprises a diode that is electrically connected between the first resistor and the transmitter antenna.
4 . The method of claim 2 , wherein the envelope detector further comprises a capacitor that is connected to the node residing between the first and second resistors, and
wherein determining, as the voltage level, a voltage level at a node residing between the first and second resistors comprises determining, as the voltage level at the node residing between the first and second resistors, a voltage level across the capacitor.
5 . The method of claim 1 , wherein the transmitter module further comprises an amplifier, and
the method further comprising:
after determining a voltage level that is indicative of the impedance detected, using the amplifier to amplify the voltage level.
6 . The method of claim 5 , wherein the amplifier is an operational amplifier.
7 . The method of claim 1 , wherein the transmitter module further comprises an analog to digital converter, and
the method further comprising:
using the analog to digital converter to convert the voltage level to a digital representation of the voltage level.
8 . The method of claim 1 , wherein determining whether the voltage level has changed by the threshold amount comprises:
monitoring the voltage level by periodically sampling the voltage level.
9 . The method of claim 1 , further comprising based on the activation state, determining a control signal indicating whether the activation state of the transmitter antenna's wireless transmission of electrical energy is to be changed.
10 . The method of claim 9 , wherein causing the transmitter antenna to engage in wireless transmission of electrical energy via near-field magnetic coupling comprises:
in response to the control signal, causing the transmitter antenna to engage in wireless transmission of electrical energy via near-field magnetic coupling.
11 . The method of claim 10 , further comprising initiating an identification stage for a receiver module if the control signal indicates that the activation state of the transmitter antenna's wireless transmission of electrical energy is to be changed from deactivated to activated.
12 . The method of claim 10 , wherein the transmitter module further comprises a microcontroller,
wherein causing the transmitter antenna to engage in wireless transmission of electrical energy via near-field magnetic coupling comprises, (i) in response to the control signal and (ii) using the microcontroller, causing the transmitter antenna to engage in wireless transmission of electrical energy via near-field magnetic coupling.
13 . The method of claim 1 , wherein the transmitter module further comprises: (i) a power stage inverter and (ii) an impedance matching circuit, wherein the power stage inverter is connected to the transmitter antenna via the impedance matching circuit, and
wherein determining the voltage level comprises determining the voltage level at a node residing between the transmitter antenna and the impedance matching circuit.
14 . The method of claim 1 , further comprising:
sensing whether any undesired object is in the near field of the transmitter module; and
based on the sensing whether any undesired object is in the near field of the transmitter module, control the activation state of the transmitter antenna's wireless transmission of electrical energy.
15 . The method of claim 1 , further comprising monitoring a temperature level within the transmitter module, and
wherein determining the activation state for the transmitter antenna comprises based on the monitored temperature level, determining the activation state for the transmitter antenna.
16 . The method of claim 1 , wherein the given frequency range is a 13.56 megahertz (“MHz”) frequency band.
17 . The method of claim 1 , wherein the given frequency range is a 6.78 megahertz (“MHz”) frequency band.