Multi-gear constant-power output device

Abstract

The invention discloses a multi-gear constant-power output device. The device comprises a power conversion module used for outputting voltage power supplies with different powers, and a voltage feedback module which is electrically connected to the power conversion module, wherein an input end of the power conversion module is connected with a battery, an output end of the power conversion moduleis connected with a load, the voltage feedback module is used for sending a feedback voltage to the power conversion module, and the power conversion module receives the feedback voltage and convertsa battery voltage into an output voltage of the corresponding magnitude. According to the scheme, the power conversion module has a boost function and a buck function at the same time, the magnitude of the output voltage can be adjusted according to the feedback voltage of the voltage feedback module, and the constant-voltage stable control of the output voltage is achieved. Meanwhile, the outputvoltage of a target value can be directly obtained through one time of voltage boost or buck, the voltage boost and then voltage buck of an input voltage are not needed, the conversion is completed ata time, and the conversion efficiency is improved.

Description

technical field [0001] The invention relates to a control device, more specifically a multi-gear constant power output device. Background technique [0002] Small volume and portable electronic cigarettes have become a new trend. At the same time, the output voltage of lithium batteries is 3.0-4.2V, and the battery voltage is uncertain in actual use. Therefore, when outputting at constant voltage, it is necessary to first judge the current battery voltage. If the voltage output target voltage, need to use step-down mode; if the battery voltage is lower than the target voltage of constant voltage output, need to use boost mode to achieve. Therefore, to realize the constant voltage output of the electronic cigarette, it is necessary to integrate the BOOST step-up circuit and the BUCK step-down circuit on the PCBA, but the small volume of the electronic atomizer cannot provide enough space for the simultaneous placement of the two circuits. [0003] Specifically, there is anot...

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Problems solved by technology

Therefore, to realize the constant voltage output of the electronic cigarette, it is necessary to integrate the BOOST step-up circuit and the BUCK step-down circuit on the PCBA, but the small volume of the electronic atomization cigarette cannot provide enough space for the simultaneous placement of the two circuits

[0003] Specifically, there is another solution in this field: first use a booster circuit to raise the battery voltage to 5V, and then reduce the voltage to the target voltage to achieve this. This method is simple, but it also faces two problems: 1. It is difficult to make the final efficiency high. Specifically, actual efficiency = boost efficiency * step-down efficiency = 85% * 85% = 0.72; 2. This method also faces problems such as a large number of components and a large PCB area

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