Ripple converter
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakashi NOMA, Hiroshi TAKEMURA
Life of this patent
Estimating the term…
Abstract
A ripple converter includes a transistor for switching an input direct-current voltage, a choke coil and a smoothing capacitor for smoothing the switched direct-current voltage, a flywheel diode for causing a current to flow through the choke coil when the transistor is turned off, and a comparing unit for controlling the ON/OFF of the transistor according to ripple in an output voltage. In the ripple converter, a waveform converter is provided on a connecting path between an output terminal and a non-inverting input terminal of a comparator in the comparing unit. A result of converting the waveform of the output voltage is compared with a reference voltage, and a result of the comparison is fed back to the transistor.
Claims15
A self-oscillation ripple converter comprising:
- a switching element arranged to switch an input direct-current voltage;
- a choke coil and a smoothing capacitor arranged to smooth the switched direct-current voltage;
- a flywheel device arranged to cause a current to flow through the choke coil when the switching element is turned off;
- and
- a control circuit arranged to perform feedback control as to whether the switching element is on or off according to ripple in an output voltage;
- wherein
- the control circuit includes a waveform converter arranged to convert a waveform of a signal that is proportional to the output voltage and output a resulting signal, and a comparing unit arranged to compare the output of the waveform converter with a reference voltage and output a result of the comparison to the switching element;
- the waveform converter includes at least one of a differentiator arranged to differentiate an input signal and output the resulting signal and an integrator arranged to integrate the input signal and output the resulting signal;
- and
- the ripple converter maintains a desired oscillation status using a delay caused by at least one of the switching element and the comparing unit.
A self-oscillation type ripple converter comprising:
- a switching element arranged to switch an input direct-current voltage;
- a smoothing element arranged to smooth the switched direct-current voltage;
- a flywheel device arranged to cause a current to flow through the smoothing element when the switching element is turned off, and
- a control circuit arranged to perform feedback control as to whether the switching element is on or off according to ripple in an output voltage;
- wherein
- the control circuit includes a waveform converter arranged to convert a waveform of a signal that is proportional to the output voltage and output a resulting signal, and a comparing unit arranged to compare the output of the waveform converter with a reference voltage and output a result of the comparison to the switching element;
- the smoothing element includes a choke coil and a smoothing capacitor;
- the waveform converter converts a waveform of the signal that is proportional to the output voltage and outputs the resulting signal;
- and
- the ripple converter maintains a desired oscillation status using a delay caused by at least one of the switching element and the comparing unit.
Dependencies are inferred from the claim text.