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Third, LLC topology circuit

1. Structure of the LLC oscillation circuit

Figure 5 shows a single-resonant capacitor structure of an LLC resonant circuit. The LLC oscillator circuit comprises an oscillating capacitor Cr, a primary-side LP (inductor), a leakage magnetic inductance Lr, a magnetizing inductance Lm, and two MOSFET transistors and two half-bridge rectifier diodes on the secondary side. This circuit includes two oscillation networks made up of three components: Cr, Lr, and Lm. One oscillation network is formed by Cr and Lr, with its oscillation frequency being independent of the load. The other oscillation network is composed of Cr and Lm, along with Lr. The frequency of this network is influenced by the load; generally, the heavier the load, the higher the resonant frequency of the circuit.

For example, imagine you have a high-power device where the load can vary significantly. In such cases, the LLC topology ensures that the circuit maintains stable performance even when the load changes. This makes it ideal for applications like power adapters or industrial power supplies, where adaptability to varying loads is crucial.

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