1, it may be that the power supply voltage is unstable, or the current is insufficient to cause the electronic components to work normally. Other componentsThe problem may be a problem with other components inside the induction cooker, such as capacitors, inductors, etc., if there is a problem with these components, it may cause the voltage detected by the feedback pin of the power chip to be unstable.
2, This power supply design has two output voltages, respectively 12V and 5V. The maximum power processing capacity is 10W, and the output voltage is 12V. The peak current of the first output is 900mA.
3, first turn off the load circuit to measure the voltage, if normal, it indicates that the load circuit is abnormal, check the load circuit. If the voltage is still low after disconnecting the load, it indicates that the power circuit itself hasFault, check whether the components change value, especially each electrolytic capacitor and voltage regulator diode, and finally change the power chip to try.
4, if the eight-pin integrated block is OK, focus on detecting whether the regulator diode is bad, the replaced regulator diode must be consistent with the original model, otherwise it is difficult to get the original voltage is consistent, or can not oscillate, of course, the oscillation coil is damaged without oscillation.
1, the power chip on the induction cooker is related to the 5v voltage, 5V is the main control chip and the key display driver chip power supply.
2. This is an 18V power module. Built-in field effect switching tube. 12 Grounding 4 The output is 18V5678 connected to 300V. 3 Sampling circuit problem, no 18V output, check 3 peripheral circuit, voltage regulator and capacitor is wrong.
3, the chip provides over temperature, over current, over voltage, under voltage and other protection functions to ensure the reliability of the system.
4, induction cooker power supply is how to produceThe main power loop of the induction cooker is directly input with AC voltage, but the power supply of the control part requires low voltage, and the power supply voltage of this part is generated using a separate power supply, generally a switching power supply.
5, the principle is electromagnetic induction phenomenon. There is a magnet, but also a coil, the coil and the magnet should have relative motion, resulting in electromagnetic induction phenomenon, that is, power generation, can make the lamp light.
1, foot connectionGround, 3-pin sampling circuit, 4-pin output 18V, 8-connected 300V.
2, This power supply design has two operating voltages, respectively 12V and 5V. The maximum power processing capacity is 10W, and the output voltage is 12V. The peak current of the first output is 900mA.
3, in the induction cooker is generally from the 18v group output end through a diode to introduce voltage to this pin. ⑤⑥⑦⑧ foot is the internal switch tube drain of the chip.
4, with a fixed 60kHz switching frequency, the chip's power supply voltage range is very wide (9V-38V) : with currentControl-type PWM modulator; Undervoltage, overvoltage, overcurrent and overheat protection with hysteresis characteristics. The peripheral circuit of the chip is simple and energy-saving.
5, VIPer12 is a switching power supply integrated circuit (IC) suitable for induction cooker. It is suitable for power applications below 13W under 220V voltage conditions in China. Although the VIPer12 and VIPer22 pin the same, the package is the same, but their power range is different. The VIPer22 is suitable for power applications below 20W.
The functions of the AP8012 VIPER12A pin are as follows: pin 5678 is connected to the leakage set of the internal FET, pin 12 is the source pole of the internal FET, pin 3 is the feedback input, and pin 4 is the VDD.
DRAIN: Drain pin for the drain end of the high-voltage power switch MOS-FET, but also for internal high-voltage current sources and charging, with a maximum voltage resistance of 730 V.
viper12A is a power chip. 1/2Grounding of the feet. 3 Pin feedback voltage input. 4-pin power supply. 5/6/7/8 is the drain of the power tube, connected to the switching transformer. If pin 1/2 communicates with any other pin, the chip is damaged.
This is an 18V power module. Built-in field effect switching tube. 12 Grounding 4 The output is 18V5678 connected to 300V. 3 Sampling circuit problem, no 18V output, check 3 peripheral circuit, voltage regulator and capacitor is wrong.
VIPer12A has the characteristics of simple circuit, stable operation and excellent performance, and is often widely used in low-power switching power supplies