Multipath high voltage output power supply circuit for smectic phase liquid crystal electronic label, and boost method

Abstract

The invention discloses a multipath high voltage output power supply circuit for a smectic phase liquid crystal electronic label, and a boost realization method based on the circuit. The circuit comprises a primary boost circuit, a rectification circuit, N charge pump dual-voltage circuits in cascade connection, and a voltage adjusting circuit. The N charge pump dual-voltage circuits perform voltage multiplying for N times on inputted low voltages, and then the voltages are transmitted to the smectic phase liquid crystal electronic label through a selected high-voltage output end. The boost method comprises: inputting DC low voltages, and after voltage adjustment through the voltage adjusting circuit, the voltage at each high-voltage output end respectively rises slowly to a corresponding needed high voltage value and is finally continuously outputted. According to the invention, high voltage output of multipath different voltage values is provided, each high voltage output is also provided with multiple high voltage value changes, outputted DC high voltages are stable and reliable, and the circuit and the method provided by the invention are particularly suitable for satisfying the demand for a quite good display effect only when the smectic phase liquid crystal electronic label displays different gray scales and different high voltages are needed at different temperature conditions.

Description

technical field [0001] The invention relates to a multi-channel high-voltage output power supply circuit for smectic-phase liquid crystal electronic labels and a boosting method based on the multi-channel high-voltage output power supply circuit for smectic-phase liquid crystal electronic labels, belonging to the field of power supplies for smectic-phase liquid crystal electronic labels. Background technique [0002] At present, the price of the existing power supply circuit used by ordinary electronic tags is very high. Generally, the input voltage is provided by a button battery, and after a certain boost, it finally outputs a required, definite, and lower voltage value. However, the smectic phase The pixels on the liquid crystal electronic label (that is, the electronic label made by the smectic liquid crystal display) need to be driven by a higher voltage, and the voltage values ​​required for the pixels to show different states are different, that is to say, the smectic ...

AI Technical Summary

Problems solved by technology

[0002] At present, the price of the existing power supply circuit used by ordinary electronic tags is very high. Generally, the input voltage is provided by a button battery, and after a certain boost, it finally outputs a required, definite, and lower voltage value. However, the smectic phase The pixels on the liquid crystal electronic label (that is, the electronic label made by the smectic liquid crystal display) need to be driven by a higher voltage, and the voltage values ​​required for the pixels to show different states are different, that is to say, the smectic liquid crystal Electronic tags need to be driven by multiple high voltages with different amplitudes, and when displaying different gray scales under different temperature conditions, smectic liquid crystal electronic tags need more and different high voltage drives to get better display effects

However, the existing power supply circuit used by ordinary electronic tags can only output a fixed voltage value, and the voltage value cannot be adjusted, and the output voltage value is not high. If the 6V voltage of two button batteries is converted to achieve smectic phase The driving voltage requirements of liquid crystal electronic tags are generally difficult to achieve, and high power conversion efficiency cannot be guaranteed

[0003] In addition, for the existing power circuit used by ordinary electronic tags, it is necessary to directly set its enable pin high when starting, but this will cause the power circuit to charge all its capacitors in a very short time, so that all capacitors reach Therefore, the existing power supply circuit will generate a large transient current at the moment of power-on, causing the output voltage to be pulled down instantly, which will easily cause a restart phenomenon

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