Controllable power supply sequence The power supply sequence of the traditional power distribution box is basically dead. It is what it is designed to be, and it is difficult to change it later; but after each channel is individually controllable, the power supply sequence and power-off sequence can be achieved. Fully controllable, programmable, and OTA available. The iteration speed is fast and the design change cost is low. We can find that the traditional power distribution box has fixed functions and cannot be upgraded. The wiring harness allowance needs to be checked during design. The design verification is complicated, the calculation is many, the test cycle is long, and the update iteration speed is slow. In order to ensure the compatibility of different models and configurations, a large number of reservations are required. The above reasons lead to increased design complexity, high design cost, and poor use flexibility.