1-6kw Low Frequency Solar Inverter

FI series :1-6kw low frequency solar inverter

The DC regulated power supply is a device that converts 220V power frequency AC power into a DC voltage with a regulated output. It needs to go through four links of transformation, rectification, filtering, and voltage regulation.

The working principle of the four links is as follows:

(1) Power transformer: It is a step-down transformer, which converts the 220V AC voltage of the power grid into an AC voltage that meets the needs and sends it to the rectifier circuit. The transformation ratio of the transformer is determined by the secondary voltage of the transformer.

(2) Rectifier filter circuit: The rectifier circuit converts the AC voltage Ui into a pulsating DC voltage. Then, the larger ripple component is filtered out by the filter circuit, and the DC voltage U1 with smaller ripple is output. Commonly used rectifier and filter circuits include full-wave rectifier and filter, bridge rectifier and filter, etc.

(3) Filter circuit: It can filter out most of the AC components in the output voltage of the rectifier circuit, so as to obtain a relatively smooth DC voltage. Each filter capacitor C satisfies RL-C=(3~5)T/2, or medium T is the input AC signal cycle, and RL is the equivalent load resistance of the rectifier filter circuit.

(4) Voltage stabilizer circuit: The function of the voltage stabilizer circuit is to stabilize the output DC voltage, which does not change with the change of the AC grid voltage and load. Commonly used integrated voltage regulators include fixed three-terminal voltage regulators and adjustable three-terminal voltage regulators. Commonly used adjustable positive voltage integrated voltage regulators include CW317 (LM317) series, their output voltage is adjustable from 1.25V to 37V, and the external components of simpler circuits only need a fixed resistor and a potentiometer. Its chip has transient, overheating and safety protection, and the maximum output current is 1.5A.

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