DC-DC converter capable of soft starting function by slowly raising reference voltage
First Claim
1. A DC-DC converter comprising:
- an oscillation circuit for oscillating a predetermined frequency and generating a pulse with a predetermined pulse width;
a reference voltage generating circuit for generating a reference voltage;
means mounted in said reference voltage generating circuit for slowly rising said reference voltage;
a switching circuit for chopping the current inputted from a DC primary electric power source in accordance with said pulse; and
feedback control means for stopping/restarting the oscillation of said oscillation circuit on the basis of the voltage that the output of said switching circuit is smoothed and further comprising said reference voltage with a detection voltage upon stopping control.
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Accused Products
Abstract
A DC-DC converter includes an oscillation circuit for oscillating at a predetermined frequency and generating a pulse with a predetermined pulse width, a reference voltage generating circuit for generating a reference voltage, means mounted in the reference voltage generating circuit for slowly rising the reference voltage, a switching circuit for chopping the current inputted from a DC primary electric power source in accordance with the pulse, and feedback control means for stopping/restarting the oscillation of the oscillation circuit on the basis of the voltage that the output of the switching circuit is smoothed and including the reference voltage with a detection voltage upon stopping control, so that the DC-DC converter having a soft starting function is provided with a simple structure and a compact size without utilizing a PWM circuit and a VCO.
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Citations
27 Claims
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1. A DC-DC converter comprising:
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an oscillation circuit for oscillating a predetermined frequency and generating a pulse with a predetermined pulse width;
a reference voltage generating circuit for generating a reference voltage;
means mounted in said reference voltage generating circuit for slowly rising said reference voltage;
a switching circuit for chopping the current inputted from a DC primary electric power source in accordance with said pulse; and
feedback control means for stopping/restarting the oscillation of said oscillation circuit on the basis of the voltage that the output of said switching circuit is smoothed and further comprising said reference voltage with a detection voltage upon stopping control. - View Dependent Claims (2, 3, 4, 5)
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6. A DC-DC converter comprising:
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an oscillation circuit for oscillating at a predetermined frequency and generating a pulse with a predetermined pulse width;
feedback control means for stopping/restarting the oscillation of the oscillation circuit by inputting a feedback control signal to the oscillation circuit; and
a switching circuit for chopping current inputted from a DC primary electric power source in accordance with the pulse from the oscillation circuit, wherein the feedback control means includes a reference voltage generating circuit for generating a reference voltage and means for slowly raising the reference voltage connected between the reference voltage generating circuit and ground. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A DC-DC converter comprising:
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an oscillation circuit for oscillating at a predetermined frequency and generating a pulse with a predetermined pulse width;
feedback control means for stopping/restarting the oscillation of the oscillation circuit by inputting a feedback control signal to the oscillation circuit, including a reference voltage generating circuit for generating a reference voltage and means for slowly raising the reference voltage connected between the reference voltage generating circuit and ground; and
a switching circuit for chopping current inputted from a DC primary electric power source in accordance with the pulse from the oscillation circuit;
an over current detection circuit including a resistor connected to a transistor in the switching circuit, a threshold voltage generating circuit for generating a threshold voltage, and a comparator for generating an over current detection signal by comparing an over current detection voltage generated due to the resistor connected to the transistor and the threshold voltage; and
stopping/restarting means for receiving the feedback control signal and the over current detection signal as inputs and providing an output to the oscillation circuit. - View Dependent Claims (22, 23)
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24. A circuit comprising:
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an electric power source for supplying an electric power;
a DC-DC converter having an input connected to the electric power source, and an output; and
a load connected to the output of the DC-DC converter;
wherein the DC-DC converter comprises;
an inductance element section connected to the input;
a switching circuit for chopping current inputted from the electric power source through the inductance element section in accordance with the pulse from the oscillation circuit;
an oscillation circuit for oscillating at a predetermined frequency and generating a pulse with a predetermined pulse width; and
feedback control means for stopping/restarting the oscillation of the oscillation circuit by inputting a feedback control signal to the oscillation circuit, wherein the feedback control means includes a reference voltage generating circuit for generating a reference voltage and means for slowly raising the reference voltage connected between the reference voltage generating circuit and ground. - View Dependent Claims (25, 26, 27)
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Specification