The 24v switch power is a power converter that is widely used in industrial and commercial applications. It enables the conversion of communication power to stable direct currents and controls output voltage, current and power through internal switches。
I. Rationale for the 24v switch
The 24v switch power is a high-frequency reverse switch power which is based on pwm control. It converts direct currents into high frequency communication by converting the incoming exchange power into a direct current power source and then using a switch (e. G. A field effect tube), and transforms direct currents into high frequency communications, and transforms the voltage through transformers to produce a stable 24v direct current voltage。
Specifically, the process of running the 24v switch can be divided into the following steps:
Enter the current filter: the exchange power entered is first processed through the current bridge and converts it to a direct current. The filtering is then carried out through the filtering of the capacitor to remove the pulsating components of the direct current and obtain a smoother direct current voltage. Pwm control: the pwm controller controls the size of the output voltage by adjusting the steering and closing time of the switch (i. E. The space ratio) to the feedback signal of the output voltage. When the output voltage is below the set value, the pwm controller increases the conductive time of the switch and increases the output voltage; on the other hand, when the output voltage is above the set value, the pwm controller reduces the conductive time of the switch and reduces the output voltage. Hf reverse: direct currents controlled by pwm are sent to the input end of the switch, which is controlled by the pwm signal for high-speed breakovers and conversion of direct currents to high-frequency communication. The frequency of this high frequency communication is usually between tens and hundreds of khz. Transformer transformer: hf communication power is converted by voltage through transformer and receives the required output voltage. The function of the transformer is to reduce the input voltage to the required output voltage level and to control the size of the output voltage by applying a round ratio. Output filtration wave: hf communication is re-routed through the current bridge after the transformer has changed, and receives direct current voltage. The filtering is then carried out through the filtering of the capacitor to remove the high-frequency pulsation in the direct current and to obtain a stable output voltage. Feedback control: the output voltage is returned to the pwm controller via the feedback circuit, compared to the set voltage. If the output voltage is higher or lower than the assigned voltage, the pwm controller adjusts the space ratio of the switch to maintain the stability of the output voltage. Ii. Circuit analysis for 24v power switches
The circuits of the 24v switch power supply consist mainly of input flow filter circuits, pwm control circuits, high frequency reverse circuits, transformer circuits and output flow filter circuits. The following is a detailed analysis of these circuits:
Enter flow filter circuit: pwm controlled circuit: hf reverse circuit: transformer transformer circuit: output stream filter circuit: common failure of three, 24v switches and maintenance methods
A number of common malfunctions may occur during the use of the 24v switch power, such as unstable output voltage, no output voltage, damage to switch tubes, etc. The following are common failures and maintenance methods:
Output voltage instability: no output voltage: switch damage:
