Wireless transmission can charger circuit analysis - circuit selection
Wireless charging is the result of radio transmission technology, low power wireless charging electromagnetic induction type, is often used to power wireless charging resonant is often used by power supply equipment (charger) to transfer energy to the utilization device, the device using the received energy of the battery, and at the same time for its own operation.
Because of the energy between the charger and power device to transmit field, without wires, between so charger and electric device can do no conductive contact the leakage.
Introduced in this paper is a simple and practical scheme of wireless transmission to the charger, it is through the coil to transmit power wireless to the bulb (battery).The wireless transmission can charger by two major part is energy sending unit and receiver unit, can be within 5 cm for rechargeable bulb (battery).
The power supply circuit
Wireless charging is the result of radio transmission technology, low power wireless charging electromagnetic induction type, is often used to power wireless charging resonant is often used by power supply equipment (charger) to transfer energy to the utilization device, the device using the received energy of the battery, and at the same time for its own operation.
Because of the energy between the charger and power device to transmit field, without wires, between so charger and electric device can do no conductive contact the leakage.
Introduced in this paper is a simple and practical scheme of wireless transmission to the charger, it is through the coil to transmit power wireless to the bulb (battery).The wireless transmission can charger by two major part is energy sending unit and receiver unit, can be within 5 cm for rechargeable bulb (battery).
The power supply circuit
Using the 24 v and 5 v power supply to supply power field effect tube namely NE555 respectively by use of transformer substation using 7812 and 7912 the voltage source module to produce 24 v points and then by the power supply voltage to produce 7805 5 v battery.And it is important to note that two power supply.
Signal circuit
Signal circuit
Applied by NE555 oscillation frequency is about 500 KHZ signal generator, excitation signal for power amplifier circuit.Adjust the rheostat size of 555 May be changes in a certain range of the output pulse frequency and duty ratio, and get the required frequency adjustment.
Receiver charging control circuit design
Receiver charging control circuit design
Electricity after receiving coil, high frequency ac voltage through IN4007 full-wave rectifier rectifier tube, 2200 uf capacitor filter, and then woke up with 3.3 V zener diode voltage, the output direct current for the bulb (battery) to provide a stable working voltage.
Power amplifier drive circuit
By LC resonance power amplifier and parallel resonant circuit switch tube IRF640 composition.Front-end oscillation circuit of power amplifier drive circuit is mainly used for amplification of vibration signals, thus send the higher oscillation signal in the junior high frequency power circuit.
LC resonance circuit design
Rf output energy sending unit adopts the transmitter coil (inductance and capacitance) and constitute a resonance circuit.Gain more voltage, in order to improve the energy receiving unit is able to work at greater distances, energy receiving unit adopts parallel resonant circuit.
When power amplifier circuit of frequency selective resonant frequency and the excitation signal frequency at the same time, the power amplifier in resonance, the maximum voltage and current in coil, resulting in a maximum of alternating electromagnetic field.When the receiver coil and the transmitter coil near the output voltage is induced in the receiving coil, when the resonance frequency of the receiver coil circuit and transmitting frequency resonate at the same time, the voltage of the maximum value.So the transmitter coil circuit and receiving coil circuit are in a state of resonance, has the best effect of energy transmission.Coil transfer energy efficiency is higher, the greater the distance between.
Receiver charging control circuit design
Electricity after receiving coil, high frequency ac voltage through IN4007 full-wave rectifier rectifier tube, 2200 uf capacitor filter, and then woke up with 3.3 V zener diode voltage, the output direct current for the bulb (battery) to provide a stable working voltage.
Power amplifier drive circuit
By LC resonance power amplifier and parallel resonant circuit switch tube IRF640 composition.Front-end oscillation circuit of power amplifier drive circuit is mainly used for amplification of vibration signals, thus send the higher oscillation signal in the junior high frequency power circuit.
LC resonance circuit design
Rf output energy sending unit adopts the transmitter coil (inductance and capacitance) and constitute a resonance circuit.Gain more voltage, in order to improve the energy receiving unit is able to work at greater distances, energy receiving unit adopts parallel resonant circuit.
When power amplifier circuit of frequency selective resonant frequency and the excitation signal frequency at the same time, the power amplifier in resonance, the maximum voltage and current in coil, resulting in a maximum of alternating electromagnetic field.When the receiver coil and the transmitter coil near the output voltage is induced in the receiving coil, when the resonance frequency of the receiver coil circuit and transmitting frequency resonate at the same time, the voltage of the maximum value.So the transmitter coil circuit and receiving coil circuit are in a state of resonance, has the best effect of energy transmission.Coil transfer energy efficiency is higher, the greater the distance between.
Receiver charging control circuit design
Electricity after receiving coil, high frequency ac voltage through IN4007 full-wave rectifier rectifier tube, 2200 uf capacitor filter, and then woke up with 3.3 V zener diode voltage, the output direct current for the bulb (battery) to provide a stable working voltage.
The wireless transmission charger solutions and improvement need pay attention to the following points:
(1)in the transmission distance, under the condition of coil parameter is set, the sender must have the higher frequency, the transmitting coil in the resonance state, etc. Make transfer efficiency increases.
(2)methods for the improvement of distance is to improve the transmission circuit of voltage.
(3)the design adopts IN4007 rectifier rectifier tube, pipe pressure drop an average of 0.8 V.Conduction loss is big, not suitable for use in the receiving circuit.And if the schottky diode can greatly reduce the loss of the pipe, electrical energy utilization is higher.
(4) copper wire diameter, coil diameter size, number of turns and winding method not only determines the coil inductance value, also affects the efficiency of its transport.
(1)in the transmission distance, under the condition of coil parameter is set, the sender must have the higher frequency, the transmitting coil in the resonance state, etc. Make transfer efficiency increases.
(2)methods for the improvement of distance is to improve the transmission circuit of voltage.
(3)the design adopts IN4007 rectifier rectifier tube, pipe pressure drop an average of 0.8 V.Conduction loss is big, not suitable for use in the receiving circuit.And if the schottky diode can greatly reduce the loss of the pipe, electrical energy utilization is higher.
(4) copper wire diameter, coil diameter size, number of turns and winding method not only determines the coil inductance value, also affects the efficiency of its transport.
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