POWER EFFICIENT CHARGE PUMP WITH CONTROLLED PEAK CURRENTS
First Claim
Patent Images
1. A charge pump circuit, having input terminals for an input voltage and an oscillating voltage and an output terminal for an output voltage, the circuit comprising:
- a flying capacitor provided in a circuit path between the terminal for the oscillating input voltage and the output terminal,a tank capacitor coupled to the output terminal and ground, anda current limiter provided in a circuit path between the terminal for the input voltage and the output terminal but outside the circuit path between the terminal for the oscillating input voltage and the output terminal.
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Abstract
A charge pump which uses a current limit resistor to limit in-rush current and peak currents. An additional advantage of such a charge pump is that, when being coupled to a boost converter or other switching converter utilizing an inductive energy storage element, it may avoid unnecessary power dissipation caused by the current limit resistor.
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Citations
20 Claims
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1. A charge pump circuit, having input terminals for an input voltage and an oscillating voltage and an output terminal for an output voltage, the circuit comprising:
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a flying capacitor provided in a circuit path between the terminal for the oscillating input voltage and the output terminal, a tank capacitor coupled to the output terminal and ground, and a current limiter provided in a circuit path between the terminal for the input voltage and the output terminal but outside the circuit path between the terminal for the oscillating input voltage and the output terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A charge pump, comprising:
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an input node for receiving an input voltage Vin; an output node for providing an output voltage Vout; a switching node for receiving an oscillating voltage Vosc; a first capacitor coupled between the output node and ground; a second capacitor, being charged by a charging current from the input node, and discharging through the first capacitor; and a current limiter, which limits the in-rush current of the charge pump, but is outside a discharging current path of the second capacitor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A charge pump, comprising:
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an input node for receiving an input voltage Vin; an output node for providing an output voltage Vout; a switching node for receiving an oscillating voltage Vosc from a buck converter; a first capacitor coupled between the output node and ground; a second capacitor discharging through the first capacitor; and a current limiter, which limits the in-rush current of the charge pump, but is outside a charging current path of the second capacitor.
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Specification