1, MC14060BCP is a CMOS timer, it can be used to control the time, its working principle is: it has an internal clock oscillator, it can produce a regular clock signal, the clock signal can be used to control the timing function of the timer.
2, carry, borrow output. 14011B PWM square wave circuit is used to control the switching of bipolar transistor, the high electrical signal is converted into switching signal, and the reduced power is obtained by borrowing output.
3, carry, borrow output. With 14011B PWM square wave circuit, through the control of bipolar transistor break, the high electrical signal into switching signals, mc14011bcp pin function is carry, borrow output, through the approximate loss-free filtering, get reduced power supply.
4, characteristics; 1; Static work 2;d=' What is the principle of switching power supply chip '> What is the principle of switching power supply chip
It works by comparing the input comparison voltage with an internal reference voltage to control the switching frequency and duty cycle of the switching power supply. The UC3843 inputs include comparison voltage inputs, transient response control inputs, switching control inputs, and current limit control inputs. These inputs can be used to adjust the output power of the switching power supply and keep it within a predetermined range.
Switching power supply is the use of modern power electronics technology, control the switching tube on and off the time ratio, maintain stabilityA power supply with a fixed output voltage, a switching power supply is generally composed of a pulse width modulation (PWM) control IC and MOSFET. Let's take a look at the switching power supply circuit diagram and the working principle of the switching power supply.
The working principle of the switching power supply control chip r7731: the VDD pin of the chip connects a capacitor to the ground, a resistor to the positive input voltage, and the input voltage charges the capacitor through the resistor during power-on. When the voltage on the capacitor is charged to the starting voltage threshold of the chip, the chip starts to work.
UC3842 is a PWM control chip commonly used in switching powerSource control circuit. The working principle is as follows: The controller receives feedback signals: In the switching power supply, a feedback loop is usually formed through components such as inductors and capacitors, and the output voltage or current information is fed back to the controller. The UC3842 receives the feedback signal through an internal comparator and converts it into a digital signal.
The working principle of the switching power supply is different from the linear power supply, the linear power supply is to let the power transistor work in linear mode, and the switching power supply is to let the power transistor work in two working states of on and off, in other words, through the "chopper", that is, the amplitude of the input DC voltageTo achieve a pulse voltage equal to the input voltage amplitude.
PWM technology. M51995A is an off-line switching power supply primary control chip specially designed for AC, DC and converter. The principle of m51995afp switching power supply is to control the duty cycle of the switch through PWM technology to adjust the output voltage, so as to achieve the purpose of stable output.
Digital integrated circuits can be divided into TTL (bipolar triode) and CMOS (field effect tube) two categories according to the different switching components.
Thyristors can be used as DC switches and AC switches, thyristors are divided into unidirectional and bidirectional, and also derived from fast thyristors, thyristors that can be turned off, reverse-guided thyristors, light-controlled thyristors, etc. 2. Power Transistor (GTR). 3, the gate pole can turn off the thyristor (GTO). 4, Power field effect transistor (Power MOSFET).
Classified by component device, TTL andCMOS two series. According to the work logic energy classification, there are combinatorial logic circuit and sequential logic circuit.
Bipolar integrated circuit is mainly based on silicon material as substrate, and adopts buried layer technology and isolation technology on the basis of plane technology, and takes bipolar transistor as the basic component. According to the function can be divided into digital integrated circuit and analog integrated circuit two categories.
Integrated circuits include SOP, SOJ, PLCC, LCCC, QFP, BGA, CSP, FC, MCM and so on. Examples are as follows: Interconnect: Provides mechanical and electrical connection/disconnection byConnecting plugs and sockets to connect cables, brackets, chassis or other PCBS to PCBS; However, the actual connection to the plate must be through the surface mount type contact k.
optically controlled switching circuit, photoelectric switching circuit, etc. Fet junction type and insulated gate type (MOS) can be used as switching circuit.
When a current passes through a Hall chip, under the irradiation of a magnetic field, a Hall voltage will be generated at the other ends of the chip, which is called the Hall effect. There are threeA line, respectively, power supply positive, power supply negative, signal line. Generally used as a sensor.
Hall sensors are Hall components and amplifier circuits, temperature compensation circuits and regulated power supply circuits, which are integrated on a chip. We say that Hall sensors are sometimes called Hall integrated circuits. This is precisely because of its small shape, which can be said to be the shape of one of them.
Compass chip principle: First of all, the earth is a large magnet, and there will be a magnetic field between the north and south poles. The geographical North Pole happens to be the magnetic South Pole, and the geographical southThe pole is the North Pole of the magnetic field. So the small magnetic needle (or magnet) in this natural magnetic field will be deflected by its magnetic force, so you can judge the north and south direction through this principle. Hall elements are made through the Hall effect.
Hall 477 and 277 processors are different, the central control is different, the price is different. Hall 477 uses Qualcomm Snapdragon 888 processor, which supports 5G network, and supports full blood flash memory and memory, Hall 277 uses Qualcomm Snapdragon 870 processor, and the performance of the upper and lower screen lags behind about 15%.