A lot of charger online search information, the principle is much the same, the general power chip, comparator, optocoupler chip, there are different combinations, the schematic diagram is also introduced, the chip is polished, there is no way to identify.
The role of the foot integrated block should be to generate the switch tube drive signal, 358 is to control the charging mode and the battery saturation state detection. Electric car charger is specializedThe door is a charging device for the battery of the electric bicycle! Classification of chargers: with and without power frequency (50 Hz) transformers, can be divided into two categories.
Your circuit board is not a charger, it is a switching power supply, that is, an AC to DC circuit board. There are many kinds of circuits, and different types of integrated blocks on the upper 8 pins are different. For example, UC384LM358. It's labeled on it. Look at it.
This octagonal integrated block is used for regulating voltage sampling current and many other purposes.
Electric car charger has no repair value, the new only tens of dollarsWrong signal connection.
The reasons are as follows: The working voltage and output power of UC3842 (KA3842) are very different from that of UC3843 (KA3843).
First check whether the reference voltage of pin 8 of the 3842 chip is 5V. If the voltage is lower than or no 5V, it should be further checked whether the pin of IC1 has a voltage of 10V ~ 18V. If not, check whether R2, rectifier circuit, D7, R10 are faulty.
A. ⑦ Pin: power input. The starting voltage cannot be lower than 16 vAfter starting, if the supply voltage is lower than 10 V, the ⑥ pin modulation pulse output is automatically turned off to achieve undervoltage protection. The power input terminal is connected with a 36 V voltage regulator tube to prevent the chip from being damaged when the input voltage is too high. ⑧ Pin: 5 V reference voltage output end.
Pin 2 of the KA3842 is the inverting input to the error amplifier, which is usually connected through a resistance voltage division and switching power supply. The 5 pin of KA3842 is the ground terminal, and there should be a fixed resistance between it and the 2 pin. If the divider resistance measurement of disconnect pin 2 to the ground is straight through, it may be an internal loss of KA3842It doesn't work.
TL3842P can be replaced by UC3482 or KA3842A.
1, p3482. P3484 power chip and p3482 power chip belong to the same type of chip can be replaced. Power Management Integrated Circuits (Power Management Integrated Circuits) are responsible for the transformation, distribution, detection and other electrical energy in an electronic device systemThe power management responsibility of the chip.
2, TL3842P can be replaced by UC3482 or KA3842A.
3, fault code: P3482 The fault code is No. 11 cylinder deactivation system/intake valve control - performance problem. Specifically, there is a problem with cylinder 11 deactivation/intake valve control performance. The fault falls into the cylinder stop category.
4, check whether the power supply of the power chip of the p3482 tron chip is normal, and then see whether the control voltage required to output to the field tube is normal, if not normal, most of the chip is broken. if-changeThe power chip is not good, it is necessary to check the voltage of the CPU VID0~4.
5, TOP224 TOP225 TOP226 TOP227 These four can be replaced.
If bad, the most common is breakdown damage, you can use a multimeter to measure the chip's power supply end to the ground resistance or voltage, generally if within dozens of ohms or the power supply voltage is lower than normal, most can be regarded as breakdown damage, you can disconnect the supplyElectrical end, separately measure whether the power supply is normal.
The P3482 on Skyworth LCD color TV is the power management integrated block. A P3482 is an EUP3482.
Failure code P3482 is Cylinder 11 Deactivation/Intake Valve Control Performance. For some high-power cars, when the load is small, the throttle will be closed, and the engine needs to do work to obtain air intake, resulting in efficiencyThe rate is low.
can be directly substituted with 1482. The pin functions of the TL3842P power management chip are as follows: ① the output end of the internal error amplifier; The foot is the reverse input end of the internal error amplifier; The RC network between the ① and ② feet is used to determine the gain and frequency of the amplifier; ③ The foot is the input end of overcurrent detection; ④ foot resistance capacitance timing element.
p3482. P3484 power chip and p3482 power chip belong to the same type of chip can be replaced. Power Management Integrated Circuits is a chip responsible for the transformation, distribution, detection and other power management of electrical energy in an electronic device system.
The P3482 on Skyworth LCD color TV is the power management integration block. A P3482 is an EUP3482.
can be directly substituted with 1482. The pin functions of the TL3842P power management chip are as follows: ① the output end of the internal error amplifier; ② The foot is the interiorError amplifier reverse input; The RC network between the ① and ② feet is used to determine the gain and frequency of the amplifier; ③ The foot is the input end of overcurrent detection; ④ foot resistance capacitance timing element.
p component refers to a class of electronic components with p marking components, usually refers to the amplifier or switching characteristics of the diode, transistor or field effect tube. p refers to positive materials, corresponding to N-type materials.
No matter what kind of power supply, its structure is much simpler than the power supply of the crt display, and the vulnerable components are generally some small components, such as safety tubes and rectification Bridges. Power board commonly used ic: 6841203d06, these commonly used pmw chips in my professional LCD accessories store can be bought.
1, the working conditions, 7 pin voltage "15 volts to start, 4 pin will have 1 volt pulse triangle wave signal.
2, C3 should be connected to the left end of R9 and ground, pin 1 to 2The compensation network of the foot cannot cut off the DC, that is, there must be a direct crossover resistance between the two feet.
3, single-end excited switching power supply circuit diagram Single-end excited switching power supply typical circuit is shown in Figure 4. This circuit is similar in form to the single-ended flyback circuit, but the operation situation is different.
4, modify the error, which will completely destroy the isolation effect of the switching transformer, so that the output end with 220V high voltage, is a fatal defect. In order to feedback from the output, an optocoupler isolation circuit must be designed.