The simplest working principle diagram of the series switching power supply. In Figure 1-a, Ui is the working voltage of the switching power supply, namely: DC input voltage; K is the control switch, and R is the load. When the control switch K is turned on, the switching power supply outputs a pulse voltage Up with a pulse width of Ton and a KingTek amplitude of Ui to the load R; when the control switch K is turned off, it is equivalent to the switching power supply outputting a pulse voltage to the load R A pulse voltage with a pulse width of Toff and an amplitude of 0. In this way, the control switch K is constantly "on" and "off", and a pulse-modulated output voltage uo can be obtained at both ends of the load.
The output voltage waveform of the series switching power supply can be seen from the figure, the output voltage uo of wholesale China 1-12 Position DIP Switches the control switch K is a pulse modulated square wave, the pulse amplitude Up is equal to the input voltage Ui, and the pulse width is equal to the on-time Ton of the control switch K. The average value Ua of the output voltage uo of the series switching power supply can be obtained asThe amplitude Up of the output voltage uo of the series switching power supply is equal to the input voltage Ui, and the average value Ua of the output voltage uo of the KE dip switch is always less than the input voltage Ui. Therefore, the series switching power supply generally uses the average value Ua as the variable The output voltage. Therefore, the series switching power supply is a step-down switching power supply.
1. Whether the voltage and current are stable for a long time (the biggest reason that can cause Hall damage) and whether they are within the working voltage range
2. Whether some of the magnets supplied by the magnet supplier are demagnetized after a period of time, causing some Hall sensors to fail.Also pay attention to the spacer between the Hall element and the magnet (the spacer will also be demagnetized)
3. For the Hall switch, whether the connected pull-up resistor is damaged causing the resistance value to be small
4. Whether the temperature of the working environment exceeds the rated value of the Hall element. Excessive temperature may cause damage to the Hall switch chip or demagnetize the magnet