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English1. Single-ended forward excitation
Single-ended: One-way drive pulse transformer through switching device.
Forward: The phase relationship between the primary and secondary sides of the pulse transformer to ensure that when the switch is opened, the primary side of the pulse transformer is driven and the effective load on the transformer side is driven.
The biggest problem is that the t-off state in the switching circuit operates alternately. When the switch is open, the pulse transformer is in an "empty" state where the stored magnetic energy accumulates in the next cycle until the inductance saturates and the switching device burns. The magnetic flux formed by the reset circuit d3 and N3 provides the release of the excess magnetic energy channel.
2. Single-ended flyback
In contrast to a positive feedback circuit, the raw/paid phase relationship of the pulse transformer ensures that when the switch is on and the primary side of the pulse transformer is driven, the branch of the transformer does not supply power to the load, i.e. the primary/paid side is staggered on/off. The magnetic energy accumulation problem of the pulse transformer is easy to solve, but due to the leakage inductance of the transformer, a voltage spike will be formed on the primary side, and the switching device will be broken down. Need to build a circuit consisting of d3 and n3 and a voltage clamp circuit. From the circuit schematic, flyback and forward phase are very similar. Transformers have the same name on the surface, but the circuit works differently, and d3 and n3 do different things.
3. Push-Pull (central pump transformer)
The circuit structure has the characteristics of symmetrical structure, two symmetrical coils on the main side of the pulse transformer, symmetrical connection of two switches, and rotation interruption. Its working process is similar to that of a class B push-pull power amplifier in a linear amplifier circuit.
Its main advantages are: high frequency transformer core utilization (compared to single-ended circuits), high supply voltage, output power, low base two, and simple drive circuit (compared to the half-bridge circuit described later).
