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Why can't the current be adjusted or the voltage be adjusted?
For operators who have just stepped in to use stable power supply, there is a lack of substantial understanding of the basic concept of power supply.Such as constant voltage, constant current, ohm's law, the main structure of the power supply. The analysis can be divided into three aspects:
In either case, the power supply is working properly, and the operator should check that his load is in good contact, that the load is short-circuited or open, that the load is compliant, etc.
In extreme terms, if the power supply has a voltage output (constant voltage state) and the load line is cut, the natural output current is zero.Similarly, if the power supply has a current output (constant current state), and the load is short-circuited, the natural output voltage is equal to zero.
Some operators like to turn the "current regulator" potentiometer left to the end, so that the power supply no-load voltage is not up.This shows his lack of substantive understanding of "current regulation". Because a power source consumes a little current even when it's empty, and if you turn the "current regulator" off to zero, you won't release even a little current, and of course the no-load voltage won't rise. So "current regulation" generally do not set to zero, (to the right around a quarter of the circle will not happen).
This is because the operator is not clear about the concept of "constant pressure" and "constant current".If the "constant voltage" lamp is on, it indicates that the power supply is working at constant voltage.The output current is determined by the load, not by the operator,(it can be said that the current is in a passive position), if you turn the right "current adjustment" knob, the current will not increase.But then go to the right "voltage regulation" knob, the output voltage will increase, the output current will also increase.Voltage is the main, current is from).
Similarly, if the "constant current" lamp is on, it means that the power supply is working in the state of constant current. At this time, the output voltage is not "adjusted", but determined by the load.Only by adjusting the "current adjustment" knob can the output current change and the output voltage change accordingly.(here the current is the main, the voltage is from).
In short, to clarify the relationship between the master and the slave.To change the voltage and current on the load, adjust the current when the power supply is in the "constant current" state, and adjust the voltage when it is in the "constant voltage" state.
Ten stable power supply knowledge q&a
This article is mainly to the stable power supply some common questions and answers, is conducive to the power industry practitioners better understand and use the stable power supply.
Answer: with the highest sensitivity, exchange coupling. If think the frequency of the oscilloscope exchange coupling limit are low enough, can use a thousands of the resistor in series with the above a few micro method of electrolytic capacitor, and then the probe. Use dc coupling. In order to shorten the time of the steady-state, to probe the short circuit between (that is, the first to use the power of capacitance charging through the resistance).
Answer: what is the switch voltage regulator power supply?After the invention of the switching voltage regulator power supply (hereinafter referred to as the switching power supply module v-60), it gradually replaces the linear voltage regulator power supply and the thyristor phase control power supply in many fields.Early on, series switching power supply appeared, whose main circuit topology was similar to that of linear power supply, but the power transistor worked in the switching state.With the development of pulse width modulation (PWM) technology, PWM switching power supply comes out. Its characteristic is to use 20kHz carrier for pulse width modulation. The efficiency of power supply can reach 65%~70%, while that of linear power supply is only 30%~40%.Therefore, replacing linear power supply with PWM switching power supply with working frequency of 20kHz can greatly save energy, which has aroused people's wide attention and been hailed as the 20kHz revolution in the development history of power supply technology.
Answer: 1. Mainly protect the filament;2. Secondly, it shows stability
Answer: with the development of electronic technology and the expansion of the application field of digital circuits, in today's society, intelligent and digitized products have become a trend that people pursue. The performance, price and development space of equipment have attracted people's attention, especially the precision and stability of electronic equipment.Electronic equipment with good performance cannot be separated from stable power supply. The higher the stability of power supply is, the better the equipment and peripheral conditions are, and the longer the service life of the equipment is.
Answer: when the power switch is pressed, if the power supply system is normal (3.3v and 5V and the CPU power supply is normal), the power chip will generate PG(good power supply) signals to be sent to the north-south bridge and CPU respectively.When the PG signal is received by nanqiao, two channels of clock control signals, PCISTOP and CPUSTOP, will be generated. The clock signals generated by the clock circuit include one PCI clock sent to nanqiao. When the clock signal is received by nanqiao, two channels of reset signals will be generated:PCIREST reset (signal) and DRVREST reset (equipment) to reset all the parts of the motherboard circuit, including PCIREST to reset chipset, when north board after receiving the reset signal, will produce CPUREST to reset CPU, when the CPU receives the reset signal (the CPU power supply, clock reset conditions possess), marks the hard starting process of the machine has been completed, the next will be soft start.
Answer: the modern communication industry is flourishing day by day, but it cannot do without the core power source of high reliability -- the parameter purification ac stable power source.The communication secondary power supply is a kind of high reliability and high performance voltage stabilized power supply used in the field of communication, which is usually installed near the communication digital board or the control drive board, and its input and use shall not affect the quality of the communication system.This requires its reasonable structure, convenient maintenance, small volume, high efficiency, low noise, high reliability.Classification and characteristics of ac stabilized power supply: the power supply that can provide a stable voltage and frequency is called ac stabilized power supply.
A: voltage regulator is the premise of providing voltage parameters and current parameters, which guarantees the power of the voltage regulator.If you want to do 12V voltage regulator, the first step of the transformer must provide 16V ~ 18V voltage, if your voltage regulator output current 5A, then the transformer must ensure 6.5A ~ 7A to achieve voltage regulator effect, otherwise it will not reach the voltage regulator effect.
A: digital voltage regulator ensures stable output voltage when the grid voltage fluctuates or the load changes.A low ripple, high precision voltage regulator source has important practical application value in the field of instrumentation, industrial control and measurement.
A: the automatic voltage regulator can't be manually adjusted at 0 position (when the power is switched on), but its function is to stabilize the voltage at a certain position.
Advantages: low power consumption, high efficiency.Disadvantages: the disadvantages of switching voltage regulator power supply is the existence of more serious switching interference.