Wireless charger design and analytical - circuit selection principle
Wireless charger is not the traditional charging the power cord is connected to the need to recharge on the terminal equipment of the charger,Using the latest wireless charging technology, through the use of magnetic field between the coil,Magic power transmission, inductive coupling technology will become the bridge connecting charging stations and equipment.
Most of the current charger, tablet and iPhone, for example, by means of direct contact with the metal wire, to the device with a built-in battery.Wireless charging technology has the advantage of convenience and versatility.The disadvantage is low efficiency and can only provide electricity.And Apple Dock connector not only provide electricity, as well as the audio and video files via USB sync on the device.However, wireless charging technology will bring progress to WiFi and battery technologies.For does not require data transmission equipment, this new technology will greatly reduce the number of user needs all kinds of charger.In addition, through the adoption of wireless charging technology, public mobile charging stations will likely become a reality.
Wireless charger principle and structure
Wireless charger is not the traditional charging the power cord is connected to the need to recharge on the terminal equipment of the charger,Using the latest wireless charging technology, through the use of magnetic field between the coil,Magic power transmission, inductive coupling technology will become the bridge connecting charging stations and equipment.
Most of the current charger, tablet and iPhone, for example, by means of direct contact with the metal wire, to the device with a built-in battery.Wireless charging technology has the advantage of convenience and versatility.The disadvantage is low efficiency and can only provide electricity.And Apple Dock connector not only provide electricity, as well as the audio and video files via USB sync on the device.However, wireless charging technology will bring progress to WiFi and battery technologies.For does not require data transmission equipment, this new technology will greatly reduce the number of user needs all kinds of charger.In addition, through the adoption of wireless charging technology, public mobile charging stations will likely become a reality.
Wireless charger principle and structure
Figure 1 wireless charger principle and structure
Wireless charging system mainly adopts electromagnetic induction principle, to realize the energy transfer through the coil energy coupling.As shown in figure 1, the system will work when the input ac mains by full bridge rectifier circuit into direct current, or directly with 24 v direct current for power supply system.After H H power management module of the output dc by 2 m active crystals into high frequency inverter ac supply primary winding.Through 2 H H inductor coil coupling energy, electricity flows through the secondary coil output to accept change to dc conversion circuit for the battery.
The power management module
Wireless charging system mainly adopts electromagnetic induction principle, to realize the energy transfer through the coil energy coupling.As shown in figure 1, the system will work when the input ac mains by full bridge rectifier circuit into direct current, or directly with 24 v direct current for power supply system.After H H power management module of the output dc by 2 m active crystals into high frequency inverter ac supply primary winding.Through 2 H H inductor coil coupling energy, electricity flows through the secondary coil output to accept change to dc conversion circuit for the battery.
The power management module
Figure 2 power supply circuit
Emission circuit module
Figure 3 emission circuit module
As shown in figure 3, the main vibration active crystal up 2 MHZ used for oscillator circuit.Active crystals square-wave output, a second-order low-pass filter filter HHG, get stable sine wave output,The triode 13003 and its peripheral circuit composed of c class after the amplifier circuit output to coil with parallel resonant circuit of capacitance radiation. Provide energy for receiving part.
Receiving circuit module and charging circuit
Receiving circuit module and charging circuit
Figure 4 receiving circuit
Measured with parallel resonant circuit of capacitance of tubular coupling coil wire diameter for o. 5 mm, 7 cm diameter, inductance of 47 uh, carrier frequency of 2 MHZ.According to the parallel resonant formula to match the capacitance C is about 140 pf.Thus. Launch part adopts 2 MHZ active crystals produce energy carrier frequency and resonant frequency is close to.
Measured with parallel resonant circuit of capacitance of tubular coupling coil wire diameter for o. 5 mm, 7 cm diameter, inductance of 47 uh, carrier frequency of 2 MHZ.According to the parallel resonant formula to match the capacitance C is about 140 pf.Thus. Launch part adopts 2 MHZ active crystals produce energy carrier frequency and resonant frequency is close to.
Figure 5 charging circuit
Wireless charger basic function is through the coil will be H electricity H in H H wireless transmission to the battery.Simply put battery and receiving device on the charging platform can be recharged.Experiments show. Although the system also can't charging in invisible. But have more than one school can do to charge platform charging at the same time, placed in the same connection problems.
没有评论:
发表评论