Stabilized DC power supply circuit
AssigneeNanopower Solutions, Inc.
InventorShinichi Akita
Life of this patent
Estimating the term…
Abstract
A stabilized DC power supply circuit comprises an error amplifier circuit, an output amplifier circuit, an output voltage division circuit, and a reference voltage circuit. A bias current boost circuit capable of stabilized operation is added to the DC power supply circuit. Since the feedback loop of the bias current boost circuit is provided with a hysteresis function or an artificial hysteresis function by a large delay element, it is possible to adaptively control bias current without sacrifice of stability and realize a stabilized DC power supply circuit exhibiting high response and high stability with low current consumption.
Claims4
A stabilized DC power supply circuit, characterized in having,
- between first and second electrode terminals, which introduce power supply voltage,
- a reference voltage generating circuit, which generates a reference voltage;
- a voltage dividing circuit, which generates another reference voltage;
- a differential amplifier, which amplifies the voltage difference between the reference voltages;
- a voltage current output circuit, which is controlled by the differential amplifier in order to produce a stabilized output voltage;
- an output voltage dividing circuit, which detects output voltage changes;
- and
- a bias current boost circuit, which is controlled by the load current flowing from the voltage current output circuit and is connected to the differential amplifier,
- wherein the bias current boost circuit comprises
- an inverse amplification circuit exhibiting hysteresis;
- a first bias current generating circuit, which always supplies constant current;
- and
- a second bias current generating circuit, which is controlled by the inverse amplification circuit exhibiting hysteresis, and
- is designed such that the load current under which the second bias current generating circuit switches to the non-conducting state is lower than the load current under which the second bias current generating circuit is in the conducting state.
A stabilized DC power supply circuit, characterized in having,
- between first and second electrode terminals, which introduce power supply voltage,
- a reference voltage generating circuit, which generates a reference voltage;
- a voltage dividing circuit, which generates another reference voltage;
- a differential amplifier, which amplifies the voltage difference between the reference voltages;
- a voltage current output circuit, which is controlled by the differential amplifier in order to produce a stabilized output voltage;
- an output voltage dividing circuit, which detects output voltage changes;
- and
- a bias current boost circuit, which is connected to the differential amplifier,
- wherein the bias current boost circuit comprises
- an inverse amplification circuit having a delay circuit;
- a first bias current generating circuit, which always supplies constant current;
- and
- a second bias current generating circuit, which is controlled by the inverse amplification circuit having a delay circuit, and
- is designed such that the delay time by which the second bias current generating circuit is switched to the non-conducting state is at least ten times greater than the delay time by which the second bias current generating circuit is in the conducting state.
Dependencies are inferred from the claim text.