Gain-variable cross-coupled charge pump
A cross-coupling, charge-pump technology, applied in conversion equipment without intermediate conversion to AC, electrical components, climate sustainability, etc., can solve the problems of low charge pump charging efficiency, unadjustable gain, etc., to avoid reverse conduction. Loss, increase efficiency, increase efficiency effect
Active Publication Date: 2020-05-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0005] Aiming at the problems of non-adjustable gain and low charging efficiency of the charge pump in the traditional boost circuit, the present invention proposes a cross-coupled charge pump with variable gain, which not only improves the charging efficiency of the charge pump but also enables adjustable gain
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[0065] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.
[0066] The present invention proposes a cross-coupled charge pump with variable gain, which includes a gain selection module and four boost modules. In each boost module, a group of NMOS body diodes with a cross-coupling structure are used to pre-charge the capacitance. Charge, and then lift the voltage on the capacitor through the control of non-overlapping clock signals, so as to achieve different multiples of the output voltage.
[0067] Such as figure 1 (a) shows the first boost module, including the first NMOS transistor NM1, the second NMOS transistor NM2, the third NMOS transistor NM3, the fourth NMOS transistor NM4, the fifth NMOS transistor NM5, the sixth NMOS transistor NM6, the A capacitor C11, a second capacitor C12, a first transmission gate and a second transmission gate, the source of the first NMOS transistor NM1 is connected ...
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A gain-variable cross-coupled charge pump comprises a first boosting module, a second boosting module, a third boosting module, a fourth boosting module and a gain selection module. The first boostingmodule can realize double boosting of input voltage; the second boosting module can realize three or four times of boosting of input voltage on the basis of the first boosting module; the third boosting module can realize six times or eight times of boosting of the input voltage on the basis of the first boosting module and the second boosting module; and the fourth boosting module can achieve four, five, seven and nine times of boosting of the input voltage on the basis of the first boosting module, the second boosting module and the third boosting module. The charge pump can achieve flexible adjustment of gain through superposition use of the boosting modules and the selection effect of the gain selection module. In addition, a clock generation module uses a non-overlapping clock signalto control a switch tube of the charge pump, so that reverse conduction loss is avoided, and the efficiency of the charge pump is improved.
Description
technical field [0001] The invention belongs to the technical field of power management circuits, and in particular relates to a gain-adjustable cross-coupling charge pump. Background technique [0002] In the field of power management circuits, boost circuits are often used in power chips to generate a voltage higher than the power supply voltage, which is a commonly used voltage control technology. Since the switching power supply chip tends to have high efficiency and low power consumption, the requirements for the boost circuit in the switching power supply chip are getting higher and higher. [0003] There are generally two technologies for boost circuits, Boost converter and charge pump technology. Boost has high efficiency, but requires an inductor, occupies a large area, and is not easy to integrate; while the charge pump adopts a capacitive method, which has an advantage over Boost in terms of volume. But its efficiency reaches its maximum only when the output volt...
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IPC IPC(8): H02M3/07
CPCH02M3/07H02M1/0041H02M1/0048Y02B70/10
Inventor 周泽坤王佳文李响石跃王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA