| 摘要 |
An electrical power supply includes DC source outputting Vm and a device that detects insulation defects in the DC source. The device includes input terminals connected to the source's terminals, impedances Z1 and Z2 connected in series between the input terminals, where Z1=Z2=Z and Vm/Imax<z<(3/2)*Vm/Imax, wherein Imax is a maximum insulation defect current defined by a standardized safety threshold, and a current-detection circuit connected between ground and an intermediate point between the impedances. The current-detection circuit includes a microcontroller that receives a voltage proportional to the defect current originating from the intermediate point, the input terminal being connected by Z3 to a power supply with Vcc<Vm, the input terminal being connected to ground by way of Z4. The microcontroller is configured to determine amplitude of an insulation defect as a function of the voltage applied to the input terminal, wherein Z*Vcc/(4*Vm)<(Z3,Z4)<Ztmax=Z*Vcc/2Vm. |
