Wide-range direct-current meter with auxiliary power supply

The invention discloses a wide-range direct-current meter with an auxiliary power supply, which comprises a voltage conversion circuit, a current conversion circuit, a power electric energy calculation module, a storage module, a display module, a communication module and a power supply module, wherein the voltage conversion circuit and the current conversion circuit are isolated from each other,the power supply module comprises an auxiliary power supply circuit, the auxiliary power supply circuit comprises an integrated circuit, and the model of the integrated circuit is UC3843. The wide-range direct-current meter with an auxiliary power supply has the beneficial effects that the protection circuit can carry out input protection on the auxiliary power supply circuit, overvoltage, over current and over-temperature protection is achieved, and the reliability of the direct-current meter is improved; interference filtering can be carried out by the filter circuit, so that the reliabilityof the direct-current met