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US 6,603,673 B2Granted
Charge-pump circuit and a load-driving circuit utilizing the same
AssigneeDenso Corporation
InventorTomohisa Yamamoto
Life of this patent
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AssigneeDenso Corporation
InventorTomohisa Yamamoto
Estimating the term…
The present invention discloses a charge-pump circuit, which contributes to the improvement of the reliability of capacitor for boosting provided inside even under the condition where supply voltage is changed, and which also contributes to the reduction of consumption current. In this charge-pump circuit, a constant voltage generation circuit generates a reference voltage VS lower by a fixed voltage VT than a supply voltage VB of a power source +B and gives the reference voltage to a booster circuit. The booster circuit comprises an inverter circuit for alternately changing output voltage between the supply voltage VB and the reference voltage VS in response to reverse operation in synchronization with the output of an oscillation circuit, and also an inverter circuit for alternately changing output voltage between the reference voltage VS and the supply voltage VB in response to periodic reverse operation with a phase by 180° different from the phase of said inverter, whereby charging current is supplied via a diode to a first capacitor from the power source +B during the period when output of the inverter circuit is changed to the reference voltage VS, and electric charge charged on the first capacitor is shifted to the second capacitor via the diode during the period when output of the inverter circuit is changed to the reference voltage VS.
A charge pumping circuit provided with a booster circuit for boosting and comprising a first capacitor and a second capacitor each with a terminal thereof connected to a power source, charging operation is performed intermittently from said power source to the first capacitor, an electric charge charged on said first capacitor being shifted to said second capacitor via reverse-blocking means to carry out boosting of supply voltage, said charge pumping circuit further comprising:
A load drive circuit, using a charge pumping circuit, said charge pumping circuit being provided with a booster circuit for boosting and comprising a first capacitor and a second capacitor each with a terminal thereof connected to a power source, charging operation is performed intermittently from said power source to the first capacitor, an electric charge charged on said first capacitor being shifted to said second capacitor via reverse-blocking means to carry out boosting of supply voltage, said charge pumping circuit further comprising:
Dependencies are inferred from the claim text.