Patent ID: 6201674
Filing Date: 2001-03-13
Classification: G05F

Abstract:
direct-current stabilization power supply device comprising:a first transistor for acting as a power element between input and output terminals;a resistor in series with said first transistor:an amplifier which compares an output voltage of said first transistor with a first predetermined reference voltage and applies a control current in accordance with a difference between said output voltage and said first predetermined reference voltage;a base current generating section which amplifies said control current so as to generate a base current of said first transistor, and thereby minimize the difference between said output voltage and said first predetermined reference voltage; andan overcurrent protective circuit, including,a first current mirror circuit being connected to both terminals of said resistor,a second current mirror circuit being connected with said resistor and said first current mirror circuit, anda second transistor receiving a current generated from said first current mirror circuit and said second mirror circuit, and being brought into conduction so as to reduce the base current when a voltage difference between both terminals of said resistor exceeds a second predetermined reference voltage.