Power interface circuit with control chip powered from power chip

In a power interface circuit for switchably applying power from a voltage source to an electrical load in a controllable manner, said circuit including a power switching device contained in a power chip and having a gate terminal, the improvement comprising, in combination with the foregoing;

• a control chip separate from said power chip and providing a control signal on an output lead;
• means for receiving said control signal and transferring a corresponding signal to said gate terminal for controlling the switching state of the power switching device;
• and
• said power chip including an auxiliary region deriving a regulated voltage from said voltage source for powering said control chip.

A power interface circuit, comprising:

• (a) a control chip having an input lead on which power to operate the chip is supplied and an output lead;
• (b) a power chip separate from said control chip and including a power switching device having a control lead and being for supplying power to an electrical load from a source voltage, said power chip integrally including a conductor on which said source voltage is applied and a means for deriving a regulated voltage from said source voltage;
• (c) means for applying said regulated voltage to said input lead of said control chip so that the control chip is powered from the power chip;
• and
• (d) means to couple said output lead to said control lead of said power switching device whereby the switching device is controllable by said control chip.

In a power interface circuit for switchably applying power from a voltage source to an electrical load in a controllable manner;

• said circuit including a power switching device contained in a power chip and having a gate terminal, the improvement comprising, in combination with the foregoing;
• a control chip separate from said power chip and providing a control signal on an output lead;
• means for receiving said control signal and transferring a corresponding signal to said gate terminal for controlling the switching state of the power switching device;
• and
• said power chip including an auxiliary region deriving a regulated voltage from said voltage source for powering said control chip.