The switching voltage pressure supply generally refers to the switch -type voltage voltage power supply. The switching voltage voltage power supply is composed of a full -wave rectifier, switching tube, incentive signal, continuous flow diode, energy storage inductor and filter capacitor.In fact, the core part of the switching voltage power supply is a DC transformer."Switching voltage voltage power supply" is highly efficient and energy -saving compared to "tandem -tilted and integrated stabilization power supply"; strong ability to adapt to municipal power changes; the output voltage can be widely adjusted;Power; small volume, light weight and other advantages, and are widely used.
Switch voltage voltage power supply price
1. DC12V2A monitoring power supply security camera hard disk video dedicated DC voltage voltage switch reference price 11 yuan 2. Walshida 12V20A steadystrole switch power supply monitoring power supervision reference price 85 yuan 3. STJIATU monitoring voltage voltage switch power supply 12v10a monitoring power adapter monitoring monitoringReference price 47 yuan
Working principle of switching voltage pressure power supply
For a single polar rectangular pulse, its DC average voltage UO depends on the width of the rectangular pulse. The wider the pulse, the higher the average voltage value of its DC.DC average voltage U.Can be calculated by the formula, that is, UO = UM × T1/T.Mid -formation UM: - The maximum voltage value of the rectangular pulse; T: - rectangular pulse cycle; T1: rectangular pulse width.It can be seen from the above formula that when UM and T are unchanged, the DC average voltage UO will be proportional to the pulse width T1.In this way, as long as we try to make the pulse width narrow with the increase in the output voltage of the stable power supply, we can achieve the purpose of a stable voltage.
Design and application of switching voltage pressure power supply
The output voltage is 5V and the current is the maximum of 1A.The input voltage is best than the 2.5-5V of the output voltage, so that the power consumption of the voltage voltage voltage voltage IC can also be guaranteed, and the stability of the output when the level fluctuates, turn left to the right.After the switching voltage voltage power supply (hereinafter referred to as the switching power supply) came out, the linear voltage voltage power supply and the phase control power of the crystal tube were gradually replaced in many areas.In the early days, the series switching power supply appeared. The main circuit topology is similar to the linear power supply, but the power transistor works in the switch state.With the development of pulse width modulation (PWM) technology, the PWM switching power supply came out. It is characterized by the pulse width of 20kHz carrier. The efficiency of the power supply can reach 65%~ 70%, and the efficiency of linear power supply is only 30%~40%.Therefore, the PWM switching power supply with a working frequency of 20kHz replaces the linear power supply, which can greatly save energy, which has attracted widespread attention from people. It is hailed as the 20KHz revolution in the history of power technology development.With the continuous decrease in the size of the Ultra-Large-SCALE-Integrated-Ulsi chip, the size of the power supply is much larger than the microprocessor; while the aerospace, submarine, military switch power supply, and portable battery portable portable types of battery are portable.Electronic devices (such as computer, mobile phones, etc.) require a miniaturized and lightweight power supply.Therefore, a small lightweight requirement for switching power supply, including magnetic elements and capacitors, must also be small.In addition, the efficiency of switching power supply is higher, better, and more reliable.All these high -tech requirements have promoted the continuous development and progress of the switching power supply.

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