New charge pump circuits for high output voltage and large current drivability

Abstract

New charge pump circuits with high current drivability in low supply voltage are proposed. It generates a large gate-overdrive voltage of charge transfer MOSFET by pulling down the gate node voltage by deliberate leakage. A proper clock circuit is also presented to effectively suppress accompanied loss effects. The characteristics of the proposed charge pumps were investigated through simulation and measurement of fabricated circuit. The measurement result shows an excellent pumping performance especially under the condition of heavy load current.

A hybrid input charge‐pump using micropower thermoelectric generators

“…To realize better performance and longer battery lifetime, several types of wireless transmitters have been proposed [1][2][3][4], where switching converters [1][2][3][4][5][6][7][8][9][10][11][12][13] are used to utilize thermoelectric energy [1][2][3][4]12] from waste heat 1 in manufacturing processes. For example, Dalola et al . proposed an autonomous sensor system using an inductor-based DC-DC converter [1], where the boost converter [1][2][3]5,6] TPS61200 is employed to step up the voltage of the thermoelectric generator (TEG).…”

“…Unlike the above-mentioned approaches, Doms et al . realized capacitive power management circuit [4] employing a chargepump [4,7,8]. The charge-pump can achieve small size, light weight, thin circuit composition, no flux of magnetic induction, and so on, because the capacitor-based converter requires no magnetic components.…”

“…The theoretical analysis of the conventional converter is discussed in the Appendix 8. In Mode-2, the output voltage is given by V in1 + 3V in2 where the typical voltage of a lithium-ion battery, V in1 , is about 3.7 V.…”

A Hybrid-Input Negative Ring-type Converter Using Clean Energy Power Supplies

“…In the conventional converter such as the 2×/1.5× charge-pump [1]- [7], the positive stepped-up voltage is generated to drive the LED's anodes. However, when the LEDs are mismatched, the converter must switch to step-up mode due to the bad forward voltage of only one LED.…”

“…Figure 1 shows the block diagram of the conventional drivers. In Figure 1 (a), the positive stepped-up voltage is generated to drive the LED's anodes by using the 2×/1.5× charge-pump [1]- [7]. Thus, when the LEDs are mismatched, the converter must switch to step-up mode due to the bad forward voltage of only 1 The target voltage to drive WLEDs is 3.5 ∼ 3.8 V. Figure 1 (a) is difficult to achieve high power efficiency.…”