The function of the mainboard power management chip is to output each supply or control voltage according to the feedback information in the circuit, after internal adjustment, mainly responsible for identifying the CPU power supply amplitude, and providing power for the CPU, memory, AGP, chipset, etc. The power supply of the mainboard power management chip is usually 12V or 5V. If the power management chip is damaged, the motherboard will not work.
Battery management chips: include chips that provide charge control, battery protection, and charge detection for lithium batteries and other rechargeable batteries. LED driver chip: Used to control the light source in LED lamps and displays, including constant current output control and dimming functions.
Accordingly, the classification of power management chips also includes these aspects, such as linear power chip, voltage reference chip, switching power chip, LCD driver chip, LED driver chip, voltage detection chip, battery charge management chip, gate driver, load switch, broadband gap switch, etc.
The temperature is high. The power of the 7930 power chip causes a common problem of high temperature, but it can be effectively compensated with an upper radiator and coolant.
Calculate, the efficiency is only 82%, for this power of the LED constant current is a little low, our power supply (meet the certification requirements) are about 87%. There are a lot of things that affect efficiency.
Power chip 7930 should be able to replace 7602 thieves, because their compilation should be
1, LM317 as the output voltage variable integrated three-terminal regulator block, is a convenient to use, widely used integrated regulator block. There are many models of 317 series regulator block: such as LM317HVH, W317L and so on. Electronics enthusiasts often use 317 regulator blocks to make regulated power supplies with variable output voltage.
2, the power transformer can choose a 25W transformer with an output voltage of 15V, which has a sub-side output voltage peak of 189V when the grid voltage falls by 10%, and the voltage after bridge rectification and filtering is about 17V.
3, adjustable three-end stabilityThe function of voltage LM317 V1 and V2 is: when the output short-circuit, the voltage on C2 is discharged by V2, so as to achieve the purpose of reverse bias protection. In addition, when the input is short-circuited, the voltage stored on components such as C3 is drained through V1 to prevent the internal regulator from reverting. C2 is used to improve the ripple suppression ability of IC.
4, DC power supply is mostly AC power supply, when the voltage or load resistance of the AC power supply changes, the DC output voltage of the regulator will remain stable. Dc regulated power supply with electronic equipment to the direction of high precision, high stability and high reliabilityDevelopment has put forward high requirements for the power supply of electronic equipment.
5, if the component is no problem, I personally think that the circuit output 17V above will not appear the fuse often burned. If the output is below 16V, the current will exceed 5A. That's why the fuse burns out all the time. I wonder if the insurance you're using is 5A.
6, the output voltage and proportional resistance in the equation Iadj is very small not more than 100μA, so it can be ignored. As long as the resistance ratio of R1 to R2 is equal to 25:75, the output voltage is equal to 12V. By LM317 The circuit to achieve 800mA constant current output is shown in the lower circuit diagram, so that R1 is equal to 5Ω.
Disconnect the power supply and discharge the capacitor before testing. After measurement, the suspected damaged component is separated from the circuit and measured separately. Due to the limitations of the table, many measurement results can only be used as a reference and cannot be used as a conclusion of the quality of the component. There is a basic principle: what is good does not necessarily work; Measure up to the worstOf course it's bad.
Power supply UC3843 chip repair method first check the 7Pin connected electrolytic capacitor (or the feedback coil connected electrolytic capacitor), to see whether its capacity meets the requirements, such as the capacitor capacity is significantly reduced, the replacement should not be able to recover the failure of vibration; If the capacitor is normal, go to the next step.
Replace the power chip: If you confirm the power coreThe chip is faulty, then you need to replace this chip. You can purchase a new power chip and remove and replace it according to the projector's instructions.
First check the electrolytic capacitor connected to 7Pin (or the electrolytic capacitor connected to the feedback coil) to see whether its capacity meets the requirements, such as the capacity of the capacitor is significantly reduced, the replacement should not be able to recover the failure of vibration; If the capacitor is normal, go to the next step.
When the power switch tube is damaged, the current limiting resistance outside the uc3842 and g pole will be broken. You can replace it directly at this time. Both are consistent with uc3843 (ka384)3) The difference is very far, therefore, they can not be directly replaced, which must be paid attention to in the maintenance work.
If the microwave power chip is broken, it may cause the microwave to not work properly or not start at all. This kind of problem requires professional technicians to repair and replace the power chip, because it needs to involve wiring and electrical repair.
The main power management chips are dual-in-line chips, and some are surface mount packages, in which HIP630x series chip is a classic power management chip, designed by the famous chip design company Intersil. < / p > < p > common power management chip are HIP630IS653RT923ADP316KA7500, TL494, etc. The following will detail the main types of power management chips, and illustrate four common power management chips. < / p > < p > common power management chip are HIP630IS653RT923ADP316KA7500, TL494, etc.
TPS61085 is a modelHigh efficiency boost converter, input voltage range is 5V to 12V, output voltage range is 8V to 15V, maximum output current is 2A, with low power consumption, high efficiency and stable output characteristics.
There are 8 kinds of power management chips: AC/DC modulation ics. Includes low voltage control circuit and high voltage switching transistor. DC/DC modulation IC. Includes boost/buck regulators, and charge pumps. Power factor control PFC pre-tuned IC. A power input circuit with power factor correction is provided.