For high-power wireless charging roads such as new energy buses and new energy load trucks, whether they use constant current or constant voltage charging methods, byWhen the charging voltage is high and the charging flow is large, a NTC thermistor of constant power type can be set at the entrance of the input voltage at the transmitting end to prevent or weaken the harmful impact of the inrush current on the four MOS tubes, so as to increase the life of the MOS tubes and reduce the failure rate during charging.
The core of the principle of high-power wireless charger is energy transmission through the principle of electromagnetic induction. Specifically, the wireless charging system consists of two parts, namely the charger and the receiver. The charger converts electrical energy into a high-frequency electromagnetic field, while the receiver converts the electromagnetic field into electrical energy through an induction coil to achieve the process of charging. inIn the principle of high-power wireless charger, there are several key elements to consider.
Wireless charging technology is derived from radio energy transmission technology, can be divided into low-power wireless charging and high-power wireless charging two ways, its principle is through near-field induction, the wireless charging device will be transmitted by the energy to the charging terminal device, the terminal device will receive the energy into electricity stored in the battery of the device. Low-power wireless charging often uses electromagnetic induction, such as the Qi method of charging mobile phones.
Wireless charging transmitter input DC Voltage (DC Voltage). Dc voltage throughThe full power bridge, which produces AC Voltage at SW1 and SW2, is actually a square wave. Square wave loading generates an AC Current at both ends of the LC Tank. An alternating current passes through the coil to generate a magnetic field. The receiving coil senses this magnetic field and generates an AC Current in the receiving LC Tank.
Wireless charging technology is derived from radio energy transmission technology, low-power wireless charging often uses electromagnetic induction, such as the Qi method of charging mobile phones, but ZTE's electric vehicle wireless charging method is adoptedMultiple parameters such as V/67A and 10V/25A. Therefore, the two models of chargers are different in terms of parameters. The above information is for reference only.
2, to the MDY-08-EV and MDY-11-EM, are representative of the charger model, for example, MDY-08-EV original charger DC output: 5V/2A. The MDY-11-EM charger DC output is: 5V/3A, 9V/23A, 12V/67A, 10V/25A. Therefore, these two different models of chargers, the parameters are also different.
3, ①, about the above MDY-08-EV model of the charger DC output is: 5V/2A. ②, about the above MDY-11-EM charger DC output is: 5V / 3A, 9V / 23A, 12V / 67A, 10V / 25A. 3, to the above two charger models are different, the voltage, current and power of the two chargers are different.
4, the difference is that the millet 6 original charger supports 5V/3A output, and the millet 5 original charger only supports 5V/5A.
1, the most used is Ti's chip, about 12. There are many options for launch, and we're one of them.
2, wireless charging PCB, different functions, the required components are different. The required components are: resistor, capacitor, resonant capacitor, resonant coil, MOS tube, control chip, protocol chip.
3, the realization of wireless charging function requires a wireless transmitting module and receiving module, and now the new mobile phones launched by major mobile phone brands on the market have built-in wireless charging receiving modules, some of which are not insideThe mobile phone with the receiving module needs an external receiving chip, and the use of the receiving chip is also very simple (it can be inserted into the mobile phone charging port); The wireless charger needs to be connected to the power supply, but the phone can be placed on the wireless charger for wireless charging of the phone.
Application: LED driver power supply, stage lights, lamp, car lights and other LED lighting applications; Wireless charging, fast charging, mobile power, solar power, POE power; Electronic cigarette lighter, brushless motor; Beauty instrument, aromatherapy machine, water refill instrument, humidifier, hair removal instrument, atomizer, electric toothbrush and other small household appliance power switch applications.
For new energy vehicles. 100V20A, 100V23A, 100V26A MOS, 100V28A, 100V30A, these MOS are TO-3P package, 100V33A, 100V36A MOS tube, 100V38A, 100V41A, these are TO-247 package, 100V44A, 100V47A, 100V52A MOS, 100V55A, 100V57A theseIt is a MOS module in SOT-227 package.
The N7000 is a 60V, 0.115A TO-92 package MOS tube for low TO medium voltage applications. The 2N7002 is a 60V, 0.2A SOT-23 package suitable for small devices. For greater current requirements, the IRF510A provides 100V, 6A TO-220 packages, up TO the IRF540A 200V, 28A, are TO-220 packages, and the performance is gradually enhanced.
When VdVg-Vth, NMOS works onlineThe sex zone, that is, the unsaturated conduction zone, is not really conduction. Contrary to your understanding. The opening of high-voltage NMOS is about 2V, so the GS voltage of 30V is enough, or even high. Because the general DS can withstand a voltage of about 100V NMOS, its gate voltage is 20 or 30V, which depends on the instruction manual of your MOS.
Conduction condition 4V=Vgs=10V; P-MOS is generally used for high-end (side) drivers; Parameter Description: 1&2 problem incomplete; 3 The voltage of the gate to the source, that is, the turn-on voltage is up to 4V (reliable turn-on, preferably Vg)s is greater than 4V); 4 The resistance voltage of the gate to the source, measured at 10V when switched on (this is not the maximum, but let's say it is the maximum); 5 The drain withstand voltage to the source is 100V.
Depends on what circuit, what MOS is used. If it is a MOS with a VDS of 100V, then the general VGS is only 20V. Now that G and D are reversed, the VGS voltage may be higher than 20V, which may damage the MOS.
1, wireless devices also need power support, but if you can charge wirelessly, you do not need to plug in. The principle of wireless charging lights is to use wireless current. The voltage is placed on a fixed charging device for charging. But the charging disc still needs to be plugged in. That's why he charges the wireless charging light. There are many charging devices like this, such as mobile phones can now also achieve wireless charging.
2, the use method is as follows: After plugging in the power supply, touch the curved light pole with your finger at any position to light the light. Place the device that needs to be charged under the lightSwitch the mobile phone to wireless charging mode and put it into the wireless charging induction area of the lamp. Use the phone charging cable to connect the lamp USB port to the phone, and the phone can also be charged.
3, very simple, regular discharge. For example, every month (if there has been no power failure), do not plug in the AC plug, turn on the light, until the light is not bright, indicating that the electricity has been discharged. Plug in the AC power.