Power supply variable-voltage isolation output heating device and variable-frequency electric water heater thereof

The utility model discloses a power supply transformation isolation output heating device and a variable frequency electric water heater thereof, which comprise a variable frequency controller and a transformer, and the power supply output of the variable frequency controller is direct current; the power output end of the variable frequency controller is connected with a primary magnetic induction coil winding of the transformer and obtains direct current, and a secondary magnetic induction coil winding of the transformer is connected with an electric heating device. Copper wires between the primary magnetic induction coil winding and the secondary magnetic induction coil winding are isolated and are not in contact; according to the electric heating device, the output voltage can be adjusted through the variable frequency controller, direct separation of the input voltage and the output voltage is achieved, indirect voltage output is achieved, the safety of electricity utilization is improved, variable voltag