1, [Overview] Non-isolated power supply scheme (AC-DC power chip BUCK circuit), generally using BUCK circuit topology, common in small home appliance control board power supply and industrial control power supply. Its typical circuit specifications include 5V/500mA, 12V/500mA and 24V/500mA, etc., meeting level 6Energy efficiency requirements. It can pass EFT, lightning, surge and other reliability tests, and can pass 3C, UL, CE and other certifications.
2. Typical scheme: SM7205 5V/1A PSR scheme. SM7205 5V1A PSR solution; SM7505 is a high-performance primary side feedback control power switch chip applied to off-line low-power AC/DC switching power supply. It can achieve high-precision constant voltage/constant current output within the full voltage input range, the accuracy is less than ±3%, and the system can save optocoupler and TL431 and other components, reducing costs.
3. Power managementThe chip model table is as follows: PIC24F32KA301. PIC24F16KA301. PIC24F16KA101. PIC18F14K22. PIC18F14K50. PIC16F1829. PIC16F1509. dsPIC33FJ12MC201. PIC24F08KA101. PIC18F13K22. 1PIC18F13K50. 1PIC16F685. 1PIC16F689. 1PIC16F690.
PN8044 Features: Built-in 650V high avalanche capability intelligent power MOSFET. Built-in high voltage start circuit. Optimized for 18V output non-isolated applications. PN8044 semi-enclosed steady state output power 4W @230VAC. PN8046 semi-enclosed steady state output power 9W @230VAC, improved EMI downfrequency modulation technology, good load adjustment rate and work efficiency, overload protection (OLP) over-temperature protection (OTP) under-voltage protection (UV)LO).
pn8034m pin function: 1 pin BP external capacitor provides a voltage regulator reference. Two thirds of the pins are connected and S is the source. 4 Pin EN is the switch. 5 Pin D is the drain. 6 Connect the pin in empty position. The 7/8 pin connected RTN is the output voltage feedback. The foot is the external pin of the quartz crystal oscillator, through which the quartz crystal connected to the outside and the internal circuit produce oscillations in the form of series resonance. The oscillation frequency is one quarter of the carrier frequency of the image IF signal.
Abnormal temperature If the temperature displayed by the induction cooker is different from the actual temperature, it may be due to a problem with the sensor. Sensors may need to be heavyNew calibration or replacement. The induction cooker may suddenly stop running when in use because the overload protection function is triggered. This means that the load on the induction cooker is too large, resulting in overcurrent. The solution is to restart the induction cooker and replace the more powerful plug.
Pn8044In can be replaced with ViPeR12. They are Pin-to-pin, the internal structure is exactly the same, but the built-in MOSFET power difference is only, but the high-power VIP22A can directly replace the low-power VIPER12A.
Pn8044In YesAnd ViPeR12 substitution.
Also known as bipolar transistor, crystal transistor, is a semiconductor device that controls current. Triode is one of the basic components of semiconductor, has the effect of current amplification, is the core component of electronic circuit. The transistor is in a semiconductor substrate to produce two PN junctions very close to each other, the two PN junctions divide the whole semiconductor into three parts, the middle part is the base region, the two sides of the part is the emission region and the collector region, the arrangement of PNP and NPN two kinds.
2, OB2226. teaThe model of the power integration block on the power supply board of the drinking water dispenser is 48OB2226. The tea bar machine can be said to be an upgraded version of the water dispenser. It is a machine that integrates the functions of water dispenser and tea stove, and is different from the traditional water dispenser.
3, the power management chip model table is as follows: PIC24F32KA301. PIC24F16KA301. PIC24F16KA101. PIC18F14K22. PIC18F14K50. PIC16F1829. PIC16F1509. dsPIC33FJ1Two Mc201. PIC24F08KA101. PIC18F13K22. 1PIC18F13K50. 1PIC16F685. 1PIC16F689. 1PIC16F690.
1, 0V to 5V step-down circuit: Input 12~380Vac, output 5V/500mA non-isolated power supply The circuit shown in Figure 1 has a typical output of 5V/500 mA non-isolated power supply, input power range: 12-380Vac. It is commonly used in household appliances (rice cookers, washing machines and other white goods).
2,. Non-isolated constant current power supply: Non-isolated means that there is a direct connection between the load and the input end, so there is a risk of electric shock when touching the load. At present, the most used non-isolated direct step-down power supply. That is, after the AC is rectified, the DC high voltage is obtained, and then the Buck circuit is directly used for buck and constant current control.
3, non-isolated constant current power supply: non-isolated load and input directly connectedMeasure whether the pin voltage of the v ¢Per12a chip is normal to the ground, if there is an anomaly, check the components around the chip abnormal feet, such as: to the photoelectric coupler and so on. (3) If the components around the abnormal foot of the above measurement chip are normal, then it is likely that the internal circuit of the chip is abnormal or damaged, and so on.
3, ①, ask this question first check whether the components in the power input loop are normal, such as: power supply insurance, varistor, and anti-interference circuit components, etc. 2, measure the switching power supply voltage stability oscillation thick mold chip pin to ground voltage is normal, if abnormal, check the coreComponents around the chip anomalous pin, such as feedback circuit components, optocoupler components, and sampling circuit components, etc.
4, the output voltage is unstable. There are also many reasons for the output voltage instability, such as excessive output load, damage to internal components of the inverter, power supply voltage fluctuations, etc. Solution: Check whether the output load of the inverter is too large. If it is too large, reduce the load or replace the inverter. Need to check whether the internal components of the inverter are damaged, such as capacitors, transistors, diodes, etc., check one by one, find the damaged components for replacement.
5. No power output.2, the power supply has output, but the host does not display. Fault type: No power output This type of fault is the most common, mainly because the power supply does not work. In the case of the host confirming that the power cable is connected (some AC switch power should be turned on), the boot does not respond, and the display does not display (the display indicator is blinking).
6, your 12 volt DC power supply if there is no output voltage, first check the power transformer secondary output voltage, check the method, you can use 12 volt small light bulbs, you can also use a multimeter measurement. If the secondary output voltage is intact, then measure whether the four rectifier diodes are intactYou can use the resistance of the multimeter Rxk to measure its quality, the reverse resistance is close to infinity, and the forward resistance is about 2kΩ. The second is to check whether the filter capacitor is short circuit.
2, different risk of electric shock Non-isolated power supply: the load side and input of the non-isolated power supplyThe end has a direct connection, and the non-isolated power supply will introduce the high voltage of the AC power supply to the load end, thereby causing the risk of electric shock. Isolated power supply: The load side and the input side of the isolated power supply are indirectly connected, so there is no danger of electric shock when touching the load.
3. cl is caused by holding down the "dehydration" du and pressing the zhi button and the "reservation" button while pressing the "power on/off" button. Solution dao: Then you can continue to set other required laundry procedures. After the laundry procedures are all set, press the "Start/pause" button, and the child lock function will be turned on. Washing machineThe use of electrical energy to produce mechanical action to wash clothes, according to its rated washing capacity is divided into two categories of household and collective use.