Voltage generation circuit

A voltage generation circuit for generating an output voltage by supplying a driving pulse to a transistor connected to a DC power source so as to be turned on, comprising:

• a voltage detection circuit that generates a detection voltage according to the output voltage;
• a reference voltage generation circuit that generates a reference voltage which changes periodically;
• a comparison circuit that generates a control signal according to a result of a comparison between the detection voltage and the reference voltage, wherein control pulses each having a pulse width according to the detection voltage are sequentially appeared in the control signal;
• and
• a driving pulse generation circuit that generates the driving pulse corresponding to the control pulse and supplies the generated driving pulse to the transistor when the pulse width of the control pulse exceeds a predetermined width, and stops generating the driving pulse when the pulse width of the control pulse becomes smaller than the predetermined width.