Definition:

In most EV’s, there is a high voltage system (battery pack, drive system), and a low voltage system (sensors, telemetry, control unit). Most EV’s use a DC-DC converter to efficiently step down The vehicle’s battery pack voltage (200V-800V) to the vehicle’s low voltage system operating voltage (usually 12V/24V).

The DC/DC CON is usually deviated to two types of converters Galvanic Isolation and non Galvanic Isolation.

FSG Rules:

1. FSG rules demands that TS and LVS will be galvanically isolated according to the following standard (EV 1.2.1):

Galvanic Isolation – two electric circuits are defined as galvanically isolated if all of the following are true:

• the resistance between both circuits is _500 W=V, related to the maximum TS voltage of the vehicle, at a test voltage of maximum TS voltage or 250V, whichever is higher.

• the isolation voltage RMS, AC for 1 min, between both circuits is higher than three times the maximum TS voltage or 750 V, whichever is higher.

2. T11.1.5 [EV ONLY] The LVS must not use orange wiring or conduit.

3. T11.1.6 [EV ONLY] The LVS must be grounded to the chassis.

There are not specific Rules on the DC/DC Converter, except they need to be Galvanic Isolated and regulated.

Last Year's Inverter:

Deutronic DVCH1503 DC/DC converter (12V model)

Input Voltage: 200 - 470 VDC

Output Voltage: 12 VDC

(https://drive.google.com/drive/folders/1rkoHQTEXycO-Gmotjo0fRKmc5dRGaKc3).