In the learning design of switching power supplies, we often encounter names that are not well explained or difficult to distinguish. For example, the AC switching power supply and the DC switching power supply, what is the difference between the two, what is the difference? Let’s first understand the AC power supply. AC power is a proper term, usually referred to as a plug and socket finger used to connect the AC power provided by the utility, to make the home appliance and the portable small device energized and usable. Knowing the AC power, then we continue to talk about AC switching power supplies and DC switching power supplies.
The DC switching power supply uses high-speed conduction and cut-off through the circuit control switch tube, and the AC power is supplied to the transformer for voltage transformation into high-frequency DC power, thereby generating one or more sets of voltages required! The reason for the conversion to high-frequency AC is that the efficiency of high-frequency AC in the transformer transformer circuit is much higher than that of 50HZ, so the switching transformer can be made very small, and it is not very hot when working! The cost is very low. If you do not turn 50HZ into a high frequency, then there is no point in switching the power supply.
Usually, when the surface is understood, the AC switching power supply input voltage is AC. The DC switching power supply input voltage is DC. The AC power is also equal to DC AC power inverter , and the DC power is equal to DC/DC, but sometimes DC/AC is also called DC power. The DC switching power supply is generally said to be relative to the alternating current. The switching power supply is a method of changing from alternating current to direct current, that is to say, the switching power supply is actually a converter that converts the power supply to the direct current. Therefore, in practical terms, AC switching power supply is only a general term, and there is no actual principle.
The difference between DC and AC switches is essentially the same. DC AC power inverter It is the same function, controlling the disconnection and connection of the power input line.
In actual use, the AC switch is generally installed on the positive circuit of the front end of the appliance, and the AC switch is installed on the live line of the front end of the appliance.
The only difference between the two is.
Usually, when the surface is understood, the AC switching power supply input voltage is AC. The DC switching power supply input voltage is DC. The AC power is also equal to AC/DC, and the DC power is equal to DC/DC, but sometimes DC/AC is also called DC power. The DC switching power supply is generally said to be relative to the alternating current. The switching power supply is a method of changing from alternating current to direct current, that is to say, the switching power supply is actually a converter that converts the power supply to the direct current. Therefore, in the practical sense, the AC switching power supply is only a general term, and there is no practical principle.
Sixth, the working principle of switching power supply
First of all, as the name suggests, switching power supplies use electronic switching devices (such as transistors, FETs, thyristors, etc.), through the control circuit, so that the electronic switching device is constantly “on” and “off”, let The electronic switching device modulates the input voltage to achieve DC/AC, DC/DC voltage conversion, and adjustable output voltage and automatic regulation.
The working process of the switching power supply is:
Power → Input Filter → Full Bridge Rectifier → DC Filter → Switch Tube (Oscillation Inverter) → Switching Transformer → Output Rectification and Filtering.
AC power input is rectified and filtered into DC
The switching tube is controlled by a high frequency PWM (Pulse Width Modulation) signal, and that DC is applied to the switching transformer primary
The secondary of the switching transformer induces a high-frequency voltage, which is supplied to the load through rectification and filtering.
The output part is fed back to the control circuit through a certain circuit to control the PWM duty cycle to achieve stable output.
When the AC power input is input, it generally passes through something like the E-flow circle to filter out the interference on the power grid and also filter out the interference of the power supply to the power grid;
When the power is the same, the higher the switching frequency, the smaller the volume of the switching transformer, but the higher the requirements for the switching tube;
The secondary of the switching transformer can have multiple windings or one winding with multiple taps to obtain the desired output;
Generally, some protection circuits should be added, such as no-load, short-circuit, etc., otherwise the switching power supply may be burnt.
Mainly used in industry and some household appliances, such as televisions, computers, etc.
The switching power inverter supply uses high-speed conduction and cut-off through the circuit control switch.
Converting DC power to high frequency AC power is supplied to the transformer for voltage transformation to produce one or more sets of voltages required! The reason for switching to high-frequency AC is that the efficiency of high-frequency AC in the transformer transformer circuit is much higher than that of 50HZ. So the switching transformer can be done very small, and it is not very hot when working! ! The cost is very low. If you do not turn 50HZ into a high frequency, then there is no point in switching the power supply.
POWER INVERTER 