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Charge pump circuit

A technology of charge pump and circuit, which is applied in the direction of conversion equipment without intermediate conversion to AC, and can solve the problem that two or more power supplies cannot be generated by one charge pump circuit

Active Publication Date: 2014-11-05
成都市深思创芯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a charge pump circuit, which provides two kinds of output voltages at the same time through one charge pump circuit, and can also expand the circuit to provide more modes of output voltages, so as to solve the problem that some current driving chips need two or more output voltages at the same time. The problem that multiple power supplies cannot be generated by one charge pump circuit

Method used

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Experimental program
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Embodiment 1

[0021] As shown in Figure 4, the charge pump circuit of the present invention includes a capacitor C1 of fast charging type. The two sides of the capacitor C1 are the first side C11 and the second side C12 respectively, and the first input terminal Vin1 and the second input terminal Vin2 are connected in parallel to each other. The first side C11 of the capacitor C1 is connected, and a second switch K2 is provided between the first input terminal Vin1 and the first side C11, and a first switch K1 is provided between the second input terminal Vin2 and the first side C11, The first side C11 is also connected to the first output terminal Vout1 through the fourth switch K4; and

[0022] The second side C12 of the capacitor C1 is connected to the parallel second output terminal Vout2 and the ground terminal GND, and a sixth switch K6 is provided between the second side C12 and the second output terminal Vout2, and between the second side C12 and the ground terminal GND A fifth swit...

Embodiment 2

[0033]On the basis of Embodiment 1, an extended circuit structure is that the first side C11 of the capacitor C1 is also connected with a third input terminal Vin3 parallel to the first input terminal Vin1 and the second input terminal Vin2, and the first side C11 is connected to the second input terminal Vin3. A seventh switch K7 is provided between the third input terminal Vin3; the second side C12 of the capacitor C1 passes through the eighth switch K8 and the fourth input terminal Vin4. The circuit has four input terminals, and the input voltages are 2Vin at the first input terminal Vin1, 2Vin at the second input terminal Vin2, -Vin at the third input terminal Vin3, and Vin at the fourth input terminal Vin4. According to the principle similar to that of Embodiment 1, the output voltage of the first output terminal Vout1 can be 3Vin or 4Vin, and the output voltage of the second output terminal Vout2 can be 3Vin or 4Vin. From this, the output voltage combinations of four mod...

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Abstract

The invention relates to a charge pump circuit. The charge pump circuit comprises a capacitor. One side of the capacitor is parallelly connected with a first side face of the capacitor through a first input end and a second input end at least, and is further connected to a first output end through a fourth switch, a second switch is arranged between the first input end and the side, and a first switch is arranged between the second input end and the side. The other side of the capacitor is connected with a second output end and a grounding end which are parallel, a sixth switch is arranged between the side and the second output end, a fifth switch is arranged between the side and the grounding end, and the side is further connected between the first input end and the second switch through a third switch. Simultaneous outputting of two types of voltage or multiple modes of output voltage can be provided only through one charge pump circuit, the power consumption and the area of the whole circuit are greatly reduced, the circuit can be further expanded, and the problem that two or more power supplies are simultaneously required by some drive chips cannot be provided by one charge pump circuit at preset is effectively solved.

Description

technical field [0001] The present invention relates to analog integrated circuits, and more particularly to charge pump circuits. Background technique [0002] The charge pump circuit is a type of switched capacitor DC / DC (direct current to direct current) converter, which can realize various positive and negative multiples of voltage conversion through several boosts and reverse voltages. Because the circuit does not contain inductive components, it is more suitable to be made into an integrated circuit, and is widely used in portable devices such as LED driver chips and large and medium screen AMOLED driver chips that require high power efficiency. At present, the mainstream large and medium screen AMOLED driver chips generally use two or more secondary boost charge pump circuits to achieve multiple transformations of the input voltage and output two voltages at the same time, which requires more power switching tube and charging capacitor. [0003] figure 1 It shows a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 于奇左迪虎童振霄李鹏陈荣冠邓睿宁宁王海王超
Owner 成都市深思创芯科技有限公司