18650 lithium ion battery 3.7v

　　Switching power supply transformer pin wiring

　　Switching power supply transformer pin wiring - switching power supply transformer is not a regular transformer! It is both the energy storage tank inductor of the switching oscillator! It’s the load and feedback components of the switch tube again! Transformer output is just one of the features! Common switching transformer oscillating coils have two legs, three legs, four legs, five legs, and six legs. The secondary level depends on the output voltage level! The more voltage levels there are! The more secondary pins there are!

　　The main materials of switching power supply transformers are: insulating materials, wire materials, and magnetic materials. The switching power supply transformer and the switching tube together form a self-excited or separately excited intermittent oscillator, which modulates the DC voltage into a high-frequency pulse voltage, which ultimately plays the role of energy transfer and conversion. When the switch tube is turned on, the transformer converts electrical energy into magnetic field energy for storage, and when the switch tube is turned off, it is released. In the forward circuit, when the switch is turned on, the input voltage is directly supplied to the load and energy is stored in the energy storage inductor. When the switch tube is turned off, the energy storage inductor then carries out freewheeling and transfers it to the load. To put it more simply, the function of the switching power supply transformer is to convert the input DC voltage into the various low voltages we need for use.

　　Switching transformer pin related

　　The switching power supply transformer is not a conventional transformer! It is both the energy storage tank inductor of the switching oscillator! It’s the load and feedback components of the switch tube again! Transformer output is just one of the features!

　　Common switching transformer oscillating coils have two legs, three legs, four legs, five legs, and six legs. The secondary level depends on the output voltage level! The more voltage levels there are! The more secondary pins there are!

　　Switching transformer pin wiring

　　one

　　There should be 4 heads on one side and 2 heads on the other side. The side with the two heads should be the secondary, and the side with the 4 heads should be two coils. Use a multimeter to simply test it. The winding 1 with high resistance is connected to the power supply +. In addition, One end is connected to the collector of the power tube, and the remaining winding should be the feedback winding. For the specific wiring, if you search for the mobile phone charger circuit, you will understand. It is not troublesome. If the feedback winding is connected incorrectly, the circuit will not start to oscillate. Just replace the two wire ends of the winding and it should be fine.

　　two

　　This is a switching transformer that provides auxiliary power (standby power). Generally speaking, the 4-pin side is the high-voltage side (input), and the 3-pin side is the low-voltage side (output). Since the designs of various power supplies are different, the specific definition of the pins must be determined by looking at the wiring on the back of the circuit board.

　　This transformer rarely malfunctions, and there is nothing measurable: pin 4 should be completely disconnected from pin 3; pin 4 should be connected to both sides. If there is a short circuit inside the coil (usually burning peripheral devices), it will not be measured. come out.

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