Auxiliary power generation circuit

An auxiliary power generation circuit used on a filter power circuit consisting of a main duty power output end and a ground end, characterized in that the main duty power output end connecting to a first voltage stabilization capacitor, a first diode connecting to another end of the first voltage stabilization capacitor opposing the main duty power output end and a second voltage stabilization capacitor connecting to the first voltage stabilization capacitor through the first diode, the second voltage stabilization capacitor having another end opposing the first diode and connecting to the ground end, the first and second voltage stabilization capacitors forming a capacitor voltage division circuit, the first and second voltage stabilization capacitors being interposed by a first connection point connected to a short circuit element which contains a control end set on to form a short circuit with the ground end and a second diode set on by a current opposite to the short circuit element, the short circuit element being connected to a first Zener diode via the control end, the first Zener diode containing another end opposing the short circuit element and connecting to a first resistor with a selected resistance, the first resistor containing another end opposing the first Zener diode to connect to a second connection point between the second voltage stabilization capacitor and the first diode.