CN112994255A - Transmitter, receiver, wireless power supply system and household appliance - Google Patents
Transmitter, receiver, wireless power supply system and household appliance Download PDFInfo
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- CN112994255A CN112994255A CN202110277180.8A CN202110277180A CN112994255A CN 112994255 A CN112994255 A CN 112994255A CN 202110277180 A CN202110277180 A CN 202110277180A CN 112994255 A CN112994255 A CN 112994255A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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Abstract
The invention relates to the technical field of wireless charging, in particular to a transmitter, a receiver, a wireless power supply system and a household appliance, wherein alternating current is rectified into direct current through a rectifying circuit, and a regular half-wave bus voltage is provided for the transmitter; the alternating current is detected by the first zero-crossing detection circuit to obtain a zero-crossing signal, the transmission control circuit controls the first resonant circuit to modulate a communication instruction to a carrier signal according to the zero-crossing signal, and the carrier signal is coupled to the receiver through an alternating magnetic field, so that communication between the transmitter and the receiver can be still completed in a carrier communication mode when medium and high power wireless power supply is carried out; furthermore, the transmission control circuit takes the zero-crossing signal obtained by detecting the alternating current by the first zero-crossing detection circuit as the clock reference for modulating the communication instruction to the carrier signal, so that the receiver can accurately demodulate the carrier signal carrying the communication instruction, and the modulation and demodulation accuracy of the wireless carrier communication is improved.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a transmitter, a receiver, a wireless power supply system and a household appliance.
Background
Along with the research and exploration in the wireless power supply field, the electrical equipment application of wireless power supply and charging is also more mature, at present, the more common QI wireless power supply equipment in the market is the miniwatt power supply equipment, and what the QI agreement adopted is that the coil carrier wave accomplishes the data information exchange in the transmission and reception detection communication pairing and charging. However, the communication of the medium-power and high-power wireless power supply equipment cannot directly adopt a QI coil carrier communication mode, because the medium-power and high-power wireless power supply equipment usually has serious voltage ripples before resonance conversion, and the size of the ripples can change according to the size of a load, thereby affecting the accuracy of QI wireless carrier communication modulation and demodulation.
Disclosure of Invention
Embodiments of the present invention are directed to a transmitter, a receiver, a wireless power supply system and a household appliance, which can improve the accuracy of modulation and demodulation of wireless carrier communication.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
in a first aspect, an embodiment of the present invention provides a transmitter for wirelessly powering a receiver, where the transmitter includes:
a rectifying circuit for rectifying the alternating current into direct current;
the first resonant circuit is electrically connected with the rectifying circuit and is used for generating an alternating magnetic field according to the direct current so that the receiver is coupled with the alternating magnetic field to generate a load power supply;
the first zero-crossing detection circuit is electrically connected with the rectifying circuit and used for detecting the alternating current to obtain a zero-crossing signal;
and the transmitting control circuit is respectively electrically connected with the first zero-crossing detection circuit and the first resonant circuit and is used for controlling the first resonant circuit to modulate a communication command to a carrier signal according to the zero-crossing signal, and the carrier signal is coupled to the receiver through the alternating magnetic field.
Optionally, the transmission control circuit comprises:
a switching circuit electrically connected to the first resonant circuit;
and the controller is respectively electrically connected with the switching circuit and the zero-crossing detection circuit and is used for controlling the first resonant circuit to modulate the communication command to the carrier signal through the switching circuit.
Optionally, the transmission control circuit further comprises: and the first demodulation circuit is electrically connected with the controller and the first resonant circuit respectively and is used for demodulating the communication instruction modulated by the receiver in the carrier signal.
Optionally, the first demodulation circuit includes:
the differential amplification circuit is electrically connected with the first resonant circuit and used for sampling the carrier signal to obtain differential voltage;
and the comparison circuit is respectively electrically connected with the controller and the differential amplification circuit and is used for generating a demodulation signal according to the reference voltage and the differential voltage, so that the controller demodulates the communication command modulated by the receiver according to the demodulation signal.
In a second aspect, an embodiment of the present invention provides a receiver for receiving wireless power supply of a transmitter, the receiver including:
the second resonant circuit is used for coupling the carrier signal transmitted by the transmitter to obtain a load power supply;
the load switch circuit is electrically connected with the second resonant circuit and is used for transmitting the load power supply to a load;
the second zero-crossing detection circuit is electrically connected with the second resonant circuit and used for detecting the alternating current coupled with the second resonant circuit to obtain a zero-crossing signal;
and the receiving control circuit is respectively electrically connected with the second zero-crossing detection circuit and the load switch circuit and is used for controlling the load switch circuit to be switched on or switched off according to the zero-crossing signal so as to modulate a communication instruction to a carrier signal, and the carrier signal is coupled to the transmitter through the second resonant circuit.
Optionally, the reception control circuit includes:
the microprocessor is connected with the second zero-crossing detection circuit and the load switch circuit and is used for controlling the load switch circuit to be conducted according to the zero-crossing signal and modulating a communication instruction to the carrier signal;
and the second demodulation circuit is respectively connected with the second resonant circuit and the microprocessor and is used for demodulating the communication instruction modulated by the transmitter in the carrier signal.
Optionally, the receiving control circuit further includes a current detection circuit, connected to the second resonant circuit and the microprocessor, respectively, for detecting a current signal of the transmitter coupled to the receiver, and transmitting the current signal to the microprocessor.
In a third aspect, an embodiment of the present invention provides a wireless power supply system, including:
a transmitter as claimed in any one of the preceding claims and a receiver as claimed in any one of the preceding claims.
In a fourth aspect, an embodiment of the present invention provides a wireless home appliance, including:
a wireless transmitting board provided with a first receiving cavity, wherein the transmitter as claimed in claims 1-6 is mounted in the first receiving cavity;
a heating body provided with a second receiving cavity, the receiver of claims 7-9 being mounted in the second receiving cavity.
The invention has the beneficial effects that: compared with the prior art, the embodiment of the invention provides the transmitter, the receiver, the wireless power supply system and the household appliance, alternating current is rectified into direct current through the rectifying circuit, and a regular half-wave bus voltage is provided for the transmitter; the alternating current is detected by the first zero-crossing detection circuit to obtain a zero-crossing signal, the transmission control circuit controls the first resonant circuit to modulate a communication instruction to a carrier signal according to the zero-crossing signal, and the carrier signal is coupled to the receiver through the alternating magnetic field, so that communication between the transmitter and the receiver can be still completed in a carrier communication mode when medium and high power wireless power supply is carried out; furthermore, the transmission control circuit takes the zero-crossing signal obtained by detecting the alternating current by the first zero-crossing detection circuit as the clock reference for modulating the communication instruction to the carrier signal, so that the receiver can accurately demodulate the carrier signal carrying the communication instruction, and the modulation and demodulation accuracy of the wireless carrier communication is improved.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a block diagram of a circuit structure of a wireless power supply system according to an embodiment of the present invention;
fig. 2a is a block diagram of a circuit structure of a transmitter according to an embodiment of the present invention;
FIG. 2b is a block diagram of a circuit structure of another transmitter according to an embodiment of the present invention;
fig. 2c is a block diagram of a circuit structure of a transmitter according to an embodiment of the present invention;
fig. 3a is a block diagram of a circuit structure of a receiver according to an embodiment of the present invention;
FIG. 3b is a block diagram of a circuit structure of a receiver according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a wireless power supply system according to an embodiment of the invention;
FIG. 5 is a waveform diagram of a transmitter according to an embodiment of the present invention;
fig. 6 is a waveform diagram of a receiver according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a block diagram of a circuit structure of a wireless power supply system according to an embodiment of the present invention. As shown in fig. 1, the wireless power supply system 100 includes a transmitter 10 and a receiver 20, and the transmitter 10 is wirelessly connected to the receiver 20. The transmitter 10 is located in a power supply device, the transmitter 10 is connected to a direct current power supply or a power grid side (such as a mains supply), the receiver 20 is located in a device to be powered, the receiver 20 can be installed in an electronic device to be powered to provide wireless power for the electronic device, and the electronic device includes various large, medium and small power electronic devices such as an electric vehicle, an underwater naval vessel, a mobile phone and a household appliance. For example, when the wireless charging system 10 is applied to a wireless household appliance, generally, the wireless household appliance includes a wireless transmitting board and a heating body, wherein the wireless transmitting board is provided with a first accommodating cavity, the transmitter 10 is installed in the first accommodating cavity, the heating body is provided with a second accommodating cavity, and the receiver 20 is installed in the second accommodating cavity. Specifically, taking an electric cooker as an example, the transmitter 10 is located on a power supply seat of the electric cooker, the receiver 20 is installed on the electric cooker, and no data connection line exists between the power supply seat and the electric cooker.
In the present embodiment, the transmitter 10 couples power to the receiver 20 through the coil, and at the same time, the transmitter 10 communicates with the receiver 20, and the transmitter 10 modulates the communication command to the carrier signal and couples the carrier signal carrying the communication command to the receiver 20 through the coil. Similarly, the receiver 20 may couple the corresponding command of the communication command to the transmitter 10 through a coil coupling.
Currently, there are four different ways to wirelessly power: the wireless power supply equipment is low-power supply equipment, and the wireless power supply QI protocol adopts coil carrier waves to complete the data information exchange in the detection communication pairing and charging between transmitting and receiving. However, in the communication of the medium and high power wireless power supply device, since the medium and high power is before the resonance transformation, the voltage of the bus of the transmitter of the unipolar PFC circuit usually has a serious voltage ripple, and the size of the ripple may change according to the size of the load, thereby seriously affecting the demodulation accuracy in the carrier communication.
Thus, referring to fig. 2a, in an embodiment of the present invention, a transmitter is provided for wirelessly supplying power to a receiver, wherein the transmitter 10 includes a rectifying circuit 11, a first resonant circuit 12, a first zero-crossing detection circuit 13, and a transmission control circuit 14.
The rectifier circuit 11 is configured to rectify an alternating current into a direct current, in this embodiment, the rectifier circuit 11 is connected to a power supply on a power grid side (e.g., a commercial power), and after the power supply on the power grid side is connected, an alternating current obtained after EMC filtering is first sent to the rectifier circuit.
In some embodiments, referring to fig. 4, the rectifier circuit 11 includes a rectifier bridge 111 and a filter circuit 112, wherein the rectifier bridge 111 is a full-wave rectifier bridge and includes a diode D1, a diode D2, a diode D3, and a diode D4, the filter circuit 112 includes an inductor L1 and a capacitor C1, one end of the inductor L1 is connected to one end of the capacitor C1, the other end of the inductor L1 is connected to a cathode of the diode D2, and the other end of the capacitor C1 is connected to a cathode of the diode D1. Preferably, L1 takes the value 150uH and C2 takes the value 2 uF. In the present embodiment, the rectifying circuit 11 filters out the influence of the harmonic current of the switching frequency or higher on the power grid, so that the first resonant circuit 12 passes a relatively stable current in the high-frequency operation.
The first resonant circuit 12 is electrically connected to the rectifying circuit 11, and is configured to generate an alternating magnetic field according to the direct current, so that the receiver 20 couples the alternating magnetic field to generate a load power. Specifically, in some embodiments, referring to fig. 4, the first resonant circuit 12 includes an inductor L2 and a capacitor C2, the inductor L2 and the capacitor C2 form a series resonant circuit, and the inductor L2 also serves as a transmitting coil, and it can be understood that a resonant frequency is determined by values of the inductor L2 and the capacitor C2.
The first zero-crossing detection circuit 13 is electrically connected with the rectification circuit 11 and is used for detecting the alternating current to obtain a zero-crossing signal. In some embodiments, referring to fig. 4, the first zero-cross detection circuit 13 includes a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a resistor R19, an optocoupler IC1, and an optocoupler IC2, where the resistor R1, the resistor R2, the resistor R3, and the resistor R5 are current-limiting resistors and are connected to the optocoupler IC1 and the optocoupler IC2 on the light emitter side, and in this embodiment, the turn-on time width of the optocoupler IC1 and the optocoupler IC2 can be changed by adjusting the resistances of the resistor R1, the resistor R2, the resistor R3, and the resistor R5. Meanwhile, a pull-up resistor R6 is added on one side of the light receivers of the optical coupler IC1 and the optical coupler IC2, so that zero-crossing sampling of the voltage of the alternating current is completed.
A transmission control circuit 14 is electrically connected to the first resonant circuit 12 for controlling the first resonant circuit 12 to modulate a communication command to a carrier signal according to the zero-crossing signal, the carrier signal being coupled to the receiver 20 by the alternating magnetic field.
In some embodiments, referring to fig. 2b, the transmission control circuit 14 includes a switching circuit 141 and a controller 142, wherein the switching circuit 141 is electrically connected to the first resonant circuit 12, and the controller 142 is electrically connected to the switching circuit 141 and the zero-crossing detection circuit 13, respectively, for controlling the first resonant circuit 12 to modulate the communication command to the carrier signal through the switching circuit 141.
Referring to fig. 4, the switch circuit 141 includes a MOS transistor T1 and an IGBT driver circuit, and it should be noted that in the present embodiment, the switch circuit 141 may have a single-tube structure as shown in fig. 4, or may also have a half-bridge or full-bridge structure. The controller 142 controls the MOS transistor T1 to turn on or off through the IGBT driving circuit. The controller 142 herein may be comprised of a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the processor herein may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
In still other embodiments, with reference to fig. 2b, the transmission control circuit 14 further includes a first demodulation circuit 143, and the first demodulation circuit 143 is electrically connected to the controller 142 and the first resonant circuit 12, respectively, for demodulating the communication command modulated by the receiver 20 in the carrier signal.
In other embodiments, referring to fig. 2c, the first demodulation circuit 143 includes a differential amplifier circuit 1431 and a comparator circuit 1432, where the differential amplifier circuit 1431 is electrically connected to the first resonant circuit 12, and is configured to sample the carrier signal to obtain a differential voltage; the comparing circuit 1432 is electrically connected to the controller 142 and the differential amplifying circuit 1431, respectively, and is configured to generate a demodulation signal according to the reference voltage and the differential voltage, so that the controller 142 demodulates the communication command modulated by the receiver 20 according to the demodulation signal.
Specifically, referring to fig. 4, the differential amplifier circuit 1431 includes a resistor R8, a resistor R9, a resistor R10, and an operational amplifier IC4, wherein the resistor R10 is a constantan wire resistor, in this embodiment, a constantan wire resistor R10 is added between the negative output of the rectifier circuit 11 and GND, so that when the working circuit flows through R10, a slight voltage change occurs at two ends of R10, and a voltage signal on R10 is amplified by the operational amplifier IC4, and the amplified signal is connected to the comparator circuit 1432. The comparison circuit 1432 includes a resistor R7 and an operational amplifier IC5, the amplified signal is connected to the non-inverting terminal of the operational amplifier IC5, and the inverting terminal of the operational amplifier IC5 provides a reference voltage Vref, so as to complete the demodulation of the communication command modulated by the receiver 20.
In some embodiments, the transmitter 10 further comprises a step-down power supply, which takes power from the system bus and outputs a stable power to power the op amp IC4, the op amp IC5, and the controller 142.
In the embodiment of the invention, alternating current is rectified into direct current through a rectifying circuit, and a regular half-wave bus voltage is provided for the transmitter; the alternating current is detected by the first zero-crossing detection circuit to obtain a zero-crossing signal, the transmission control circuit controls the first resonant circuit to modulate a communication instruction to a carrier signal according to the zero-crossing signal, and the carrier signal is coupled to the receiver through the alternating magnetic field, so that communication between the transmitter and the receiver can be still completed in a carrier communication mode when medium and high power wireless power supply is carried out; furthermore, the transmission control circuit takes the zero-crossing signal obtained by detecting the alternating current by the first zero-crossing detection circuit as the clock reference for modulating the communication instruction to the carrier signal, so that the receiver can accurately demodulate the carrier signal carrying the communication instruction, and the modulation and demodulation accuracy of the wireless carrier communication is improved.
In an embodiment of the present invention, referring to fig. 3a, an embodiment of the present invention provides a receiver for receiving wireless power supply of a transmitter, where the receiver 20 includes a second resonant circuit 21, a load switch circuit 22, a second zero-crossing detection circuit 23, and a receiving control circuit 24.
The second resonant circuit 21 is configured to couple a carrier signal transmitted by the transmitter to obtain a load power. The second resonant circuit 21 comprises an inductor L3 and a capacitor C4, the inductor L3 and the capacitor C4 form a series resonant circuit, the inductor L3 is also used as a receiving coil, the capacitor C4 is a resonant capacitor, and magnetic resonance power transmission is completed by matching of transmitting and receiving resonant frequency.
A load switch circuit 22 is electrically connected to the second resonant circuit 21 for delivering the load power to a load. In this embodiment, the load switch circuit 22 is a thyristor.
The second zero-crossing detection circuit 23 is electrically connected to the second resonant circuit 21, and is configured to detect an alternating current coupled to the second resonant circuit 21 to obtain a zero-crossing signal. The second zero-crossing detection circuit 23 includes a diode D3, a resistor 15, and a resistor R16, and the second resonant circuit 21 couples the carrier signal transmitted by the transmitter to obtain a load power supply, half-wave rectifies the load power supply through the diode D3, and then divides the voltage through the resistor 15 and the resistor 16 to obtain an envelope waveform, so as to obtain a zero-crossing signal of the alternating current coupled by the second resonant circuit 21.
The receiving control circuit 24 is electrically connected to the second zero-crossing detection circuit 23 and the load switch circuit 22, respectively, and is configured to control the load switch circuit 22 to be turned on or off according to the zero-crossing signal, so as to modulate a communication command to a carrier signal, where the carrier signal is coupled to the transmitter 10 through the second resonant circuit. Specifically, when the load switch circuit 22 is in an open or closed state, the current level fed back by the receiver 20 to the transmitter 10 may also change. Thus, in this embodiment, the receiver 20 modulates the communication command to the carrier signal by controlling the on/off of the load switch circuit 22.
In some embodiments, referring to fig. 3b, the receiving control circuit 24 includes a microprocessor 241 and a second demodulation circuit 242, and the microprocessor 241 is connected to the second zero-crossing detection circuit 23 and the load switch circuit 22, and is configured to control the load switch 22 to be turned on according to the zero-crossing signal, so as to modulate a communication command to the carrier signal. Like the controller in transmitter 10, microprocessor 241 may be comprised of a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the processor herein may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The second demodulation circuit 242 is connected to the second resonant circuit 21 and the microprocessor 241, respectively, and is configured to demodulate the communication command modulated by the transmitter 10 in the carrier signal. Referring to fig. 4, the second demodulation circuit 242 includes a diode D2, a resistor R17, a resistor R18, a capacitor C3, and an operational amplifier IC7, the alternating current coupled by the second resonant circuit 21 is rectified by the diode D2, and the voltage of the resistor R17, the resistor R18, and the capacitor C3 is divided and filtered, and then the rectified alternating current is connected to the non-inverting terminal of the operational amplifier IC7, and the non-inverting terminal of the operational amplifier IC7 provides a reference voltage Vref, thereby completing demodulation of the communication command modulated by the transmitter 10.
In still other embodiments, with reference to fig. 3b, the receiving control circuit 24 further includes a current detection circuit 243, and the current detection circuit 243 is respectively connected to the second resonant circuit 21 and the microprocessor 241, and is configured to detect a current signal of the transmitter 10 coupled to the receiver 20 and transmit the current signal to the microprocessor 241. Referring to fig. 4, the current detection circuit 243 includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, and an operational amplifier IC6, and performs receiving working current sampling by adding a constantan wire R11 between the transmitting coil L3 and GND, and amplifies microsoft voltage signals at two ends of the R11 by using the operational amplifier IC6, and then inputs the amplified microsoft voltage signals to the microprocessor 241, thereby completing the acquisition of the current signal of the transmitter 10 coupled to the receiver 20.
In some embodiments, the receiver 20 further comprises a step-down power supply, which takes power from the system bus and outputs a stable power to provide power to the op-amp IC6, the op-amp IC7, and the microprocessor 241.
In the embodiment of the invention, the receiver comprises a second resonant circuit, a load switch circuit, a second zero-crossing detection circuit and a receiving control circuit, a load power supply is obtained by coupling a carrier signal transmitted by the transmitter through the second resonant circuit, the load switch circuit is electrically connected with the second resonant circuit and used for transmitting the load power supply to a load, and alternating current coupled with the second resonant circuit is detected through the second zero-crossing detection circuit to obtain a zero-crossing signal which provides a clock reference for the receiving control circuit to modulate a communication instruction, so that the receiving control circuit controls the load switch circuit to be switched on or switched off according to the zero-crossing signal, the communication instruction is modulated to the carrier signal by changing the current amplitude of the second resonant circuit, the carrier signal is coupled to the transmitter through the second resonant circuit, and wireless carrier communication is realized, meanwhile, the receiving control circuit takes the zero-crossing signal as a clock reference for modulating the communication instruction, so that the transmitter can accurately demodulate the carrier signal carrying the communication instruction, and the accuracy of wireless carrier communication modulation and demodulation is improved.
In order to better explain the carrier communication method of the wireless power supply system, the invention is explained by taking the wireless power supply electric cooker as a specific embodiment of the wireless household appliance.
Wherein, the transmitter 10 is located at the power supply seat of the electric cooker, the receiver 20 is installed at the electric cooker, and no data connecting line exists between the power supply seat and the electric cooker. Referring to fig. 4-6, after the sinusoidal AC power with 50HZ frequency is input at the AC input end of the power grid, the sinusoidal AC power with 50HZ passes through the EMC filtering module of the transmitter, the rectifying bridge 111 converts the AC signal into a half-wave dc signal with 100HZ, and the LC filtering circuit composed of the inductor L1 and the capacitor C1 is connected behind the rectifying bridge, so as to filter out the influence of the switching frequency or higher harmonic current on the power grid, so that the first resonant circuit 12 passes through a relatively stable current during high frequency operation, but does not affect the 100HZ envelope form of the bus to affect the demodulation operation of the communication carrier and the communication command. The emitter 10 includes a step-down power supply circuit, which outputs a stable +5V power supply after taking power from the system bus, and provides power for the components such as the operational amplifier IC4, the operational amplifier IC5, the controller 142, and the like. The first resonant circuit 12 comprises an inductor L2 and a capacitor C2, an oscillation circuit with an oscillation frequency of 25kHz is formed by the inductor L2 and the capacitor C2, the inductor L2 is a transmitting coil, the capacitor C2 is a resonant capacitor, the oscillation circuit is oscillated by an IGBT serving as a driving circuit, and the MOS transistor T1 is controlled by the controller 142 to be turned on or off by the IGBT driving circuit. A resistor R1, a resistor R2, a resistor R3 and a resistor R5 are connected in front of the rectifier bridge 111 and connected to one side of a light emitter of the optical coupler IC1 and the optical coupler IC2, the lighting time width of the optical coupler IC1 and the lighting time width of the optical coupler IC2 are changed by adjusting the resistance values of the resistor R1, the resistor R2, the resistor R3 and the resistor R5, and further, a pull-up resistor R6 is added on one side of a light receiver of the optical coupler IC1 and the optical coupler IC2, so that zero-crossing sampling of grid alternating-current voltage is completed, and the waveform input controller 142 of zero-crossing sampling shown in the figure 5 is obtained. A constantan wire resistor R10 is added between the negative output of the rectifier bridge 111 and GND, when working current flows through the resistor R10, a tiny voltage change is generated at two ends of the resistor R10, a voltage signal on the resistor R10 is amplified through a differential amplification circuit formed by an operational amplifier IC4, and the amplified voltage signal is accessed to an AD port of the controller 142 to serve as a working current sampling signal. On the other hand, the current sampling signal is connected to the non-inverting terminal of the operational amplifier IC5, and a reference voltage Vref is provided at the inverting terminal of the operational amplifier IC5, so as to demodulate the communication command modulated by the rice cooker transmitter, as shown in fig. 5. When the transmitter needs to transmit a signal, the controller 142 transmits a transmission signal packet to the IGBT driving circuit to control the MOS transistor T1 to be turned on or off by changing the pulse width form of the carrier signal according to the 100Hz reference signal. Therefore, the electromagnetic field output by the inductor L1 changes according to the frequency intensity of 100Hz (as shown in the envelope waveform of the driving tube in FIG. 5), and the transmitter continuously and constantly outputs after the content of the signal package is sent and waits for the response of the receiver of the electric cooker.
In the electric cooker receiver, an inductor L3 and a capacitor C4 form a series resonance circuit with the resonance frequency of 25KHz, wherein the inductor L3 is a receiving coil of the electric cooker and is arranged at the bottom of the electric cooker, the capacitor C4 is a resonance capacitor, and magnetic resonance is completed by transmitting and receiving the matching of the resonance frequency, so that electric energy transmission is completed. A constantan wire resistor R11 is added between the negative electrode of the inductor L3 and GND for sampling the coupling current, and the voltage signals at the two ends of the resistor R11 are amplified by an operational amplifier IC6 and then input into an AD interface of the microprocessor 241. One end of the resonant capacitor C4 is half-wave rectified into a step-down power supply through a diode D1 to generate stable VCC to supply power for the operation amplifier IC6, the operation amplifier IC7 and the microprocessor 241; the other end of the resonant capacitor C4 is subjected to half-wave rectification by a diode D2 and then is subjected to voltage division by a resistor R17 and a resistor R18, a capacitor C3 connected in parallel to the resistor R18 is a small-capacity filter capacitor and is used for filtering out resonant frequency voltage signals, then is connected with the in-phase end of the operational amplifier IC7 and is compared with a reference voltage Vref provided by the anti-phase end of the operational amplifier IC7, and then a communication command modulated by the transmitter is demodulated. In the process of receiving and transmitting the transmitted signals, the electric cooker receiver is coupled and transmits an alternating electromagnetic field with intensity conversion through a receiving coil L3 at the bottom, then 100Hz intensity conversion receiving coil induced voltage is generated, and after oscillation with a resonant capacitor C4, a 100Hz envelope voltage waveform as shown in figure 6 can be obtained, wherein the envelope comprises a 30kHz sine oscillation waveform. The voltage amplitude of the envelope is changed according to the PWM width of the communication command loaded by the transmitter, and is rectified by the diode D2, and the resistor R17, the resistor R18, and the capacitor C3 filter the voltage and then compare the voltage with the reference voltage Vref, thereby obtaining the receiving demodulation waveform shown in fig. 6. After half-wave rectification is performed through the diode D3, a 100Hz envelope waveform can be obtained through voltage division of the resistor R15 and the resistor R16, and a zero-crossing signal of the power grid voltage is obtained through processing of the microprocessor 241. When the microprocessor 241 in the rice cooker receiver needs to transmit data to the transmitter, the communication data packet is loaded by controlling the conduction of the controllable silicon T2 according to the zero-crossing signal obtained by sampling, the current sampling fed back to the transmitter can be changed due to the conduction or the disconnection of the load, and then the transmitter obtains the communication information responded by the receiver by analyzing the amplitude change of the current signal, so that the wireless power supply rice cooker coil communication work is realized.
Method embodiments are based on the same idea of product embodiments, and description of product embodiments may be referred to by method embodiments without conflicting contents.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A transmitter for wirelessly powering a receiver, the transmitter comprising:
a rectifying circuit for rectifying the alternating current into direct current;
the first resonant circuit is electrically connected with the rectifying circuit and is used for generating an alternating magnetic field according to the direct current so that the receiver is coupled with the alternating magnetic field to generate a load power supply;
the first zero-crossing detection circuit is electrically connected with the rectifying circuit and used for detecting the alternating current to obtain a zero-crossing signal;
and the transmitting control circuit is respectively electrically connected with the first zero-crossing detection circuit and the first resonant circuit and is used for controlling the first resonant circuit to modulate a communication command to a carrier signal according to the zero-crossing signal, and the carrier signal is coupled to the receiver through the alternating magnetic field.
2. The transmitter of claim 1, wherein the transmit control circuitry comprises:
a switching circuit electrically connected to the first resonant circuit;
and the controller is respectively electrically connected with the switching circuit and the zero-crossing detection circuit and is used for controlling the first resonant circuit to modulate the communication command to the carrier signal through the switching circuit.
3. The transmitter of claim 2, wherein the transmit control circuit further comprises: and the first demodulation circuit is electrically connected with the controller and the first resonant circuit respectively and is used for demodulating the communication instruction modulated by the receiver in the carrier signal.
4. The transmitter of claim 3, wherein the first demodulation circuit comprises:
the differential amplification circuit is electrically connected with the first resonant circuit and used for sampling the carrier signal to obtain differential voltage;
and the comparison circuit is respectively electrically connected with the controller and the differential amplification circuit and is used for generating a demodulation signal according to the reference voltage and the differential voltage, so that the controller demodulates the communication command modulated by the receiver according to the demodulation signal.
5. A receiver for receiving a wireless power supply of a transmitter, the receiver comprising:
the second resonant circuit is used for coupling the carrier signal transmitted by the transmitter to obtain a load power supply;
the load switch circuit is electrically connected with the second resonant circuit and is used for transmitting the load power supply to a load;
the second zero-crossing detection circuit is electrically connected with the second resonant circuit and used for detecting the alternating current coupled with the second resonant circuit to obtain a zero-crossing signal;
and the receiving control circuit is respectively electrically connected with the second zero-crossing detection circuit and the load switch circuit and is used for controlling the load switch circuit to be switched on or switched off according to the zero-crossing signal so as to modulate a communication instruction to a carrier signal, and the carrier signal is coupled to the transmitter through the second resonant circuit.
6. The receiver of claim 5, wherein the receive control circuit comprises:
the microprocessor is connected with the second zero-crossing detection circuit and the load switch circuit and is used for controlling the load switch circuit to be conducted according to the zero-crossing signal and modulating a communication instruction to the carrier signal;
and the second demodulation circuit is respectively connected with the second resonant circuit and the microprocessor and is used for demodulating the communication instruction modulated by the transmitter in the carrier signal.
7. The receiver of claim 5, wherein the reception control circuit further comprises a current detection circuit respectively connected to the second resonant circuit and the microprocessor, for detecting a current signal of the transmitter coupled to the receiver and transmitting the current signal to the microprocessor.
8. A wireless power supply system, comprising:
a transmitter according to any one of claims 1 to 4 and a receiver according to any one of claims 5 to 7.
9. A wireless home appliance, comprising:
the wireless transmitting board is provided with a first accommodating cavity, and the transmitter according to claims 1-4 is accommodated in the first accommodating cavity;
a heating body provided with a second housing chamber housing a receiver according to claims 5-7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110277180.8A CN112994255A (en) | 2021-03-15 | 2021-03-15 | Transmitter, receiver, wireless power supply system and household appliance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110277180.8A CN112994255A (en) | 2021-03-15 | 2021-03-15 | Transmitter, receiver, wireless power supply system and household appliance |
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| CN202110277180.8A Pending CN112994255A (en) | 2021-03-15 | 2021-03-15 | Transmitter, receiver, wireless power supply system and household appliance |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104995849A (en) * | 2013-01-11 | 2015-10-21 | 皇家飞利浦有限公司 | Wireless inductive power transfer |
| CN106560974A (en) * | 2016-10-28 | 2017-04-12 | 中兴新能源汽车有限责任公司 | Wireless charging system and automobile wireless charging device |
-
2021
- 2021-03-15 CN CN202110277180.8A patent/CN112994255A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104995849A (en) * | 2013-01-11 | 2015-10-21 | 皇家飞利浦有限公司 | Wireless inductive power transfer |
| CN106560974A (en) * | 2016-10-28 | 2017-04-12 | 中兴新能源汽车有限责任公司 | Wireless charging system and automobile wireless charging device |
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Effective date of registration: 20230625 Address after: Room 307 and 308, 3rd floor, Building 2, 2021 Qianshan Mingzhu South Road, Xiangzhou District, Zhuhai City, Guangdong Province, 519000 Applicant after: Zhuhai Hanxiang Technology Co.,Ltd. Address before: 518000 room 133-134, No.1 International Students (Longgang) Pioneer Park, Longcheng street, Longgang District, Shenzhen City, Guangdong Province Applicant before: ZONECHARGE (SHENZHEN) WIRELESS POWER TECHNOLOGY Co.,Ltd. |