Output voltage control circuit used for fast charging power supply
An output voltage control, charging source technology, applied in charging/discharging current/voltage regulation, battery circuit devices, circuit devices, etc., can solve the problems of high cost, high MCU resource requirements, complex circuits, etc., and achieve high-quality products. Cost-effective, simplifies the output voltage control circuit of the fast charging source, and reduces the effect of resource requirements
Active Publication Date: 2017-04-05
北京鸿智电通科技有限公司
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Problems solved by technology
In this case, if the GPIO of the MCU is used to control the MOS transistor array to change the DC-DC feedback resistance to realize the control mode of the output voltage level control, the required MOS transistors will be very complex, the cost is very expensive, and the MCU’s Resource requirements are also very high, at least 83-1=82 GPIO resources are required to control 82 MOS tubes
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[0023] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0024] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have meanings consistent with the meanings in the co...
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The invention provides an output voltage control circuit used for a fast charging power supply. The output voltage control circuit includes an intelligent control module, an NMOS transistor, a first resistor, a second resistor, a third resistor and a DCDC power supply module. The first resistor is connected between the voltage output end of the DCDC power supply module and the reference voltage input end of the DCDC power supply module, the second resistor is connected between the reference voltage input end of the DCDC power supply module and a power ground, the third resistor is connected between a drain electrode of the NMOS transistor and the reference voltage input end of the DCDC power supply module, the intelligent control module outputs PWM waves with the duty ratio adjustable, a PWM wave output pin of the intelligent control module is connected with a grid electrode of the NMOS transistor, and the source electrode of the NMOS transistor is connected with the power ground. Not only is the requirement that the fast charging power supply can adjust multiple output voltage classes met, but also the output voltage control circuit used for the fast charging power supply is simplified, the cost of the control circuit is reduced, the MCU resource demand is reduced, and a higher product cost performance is achieved.
Description
technical field [0001] The invention relates to the technical field of fast charging sources, in particular to an output voltage control circuit applied to fast charging sources. Background technique [0002] In the traditional power supply industry and the era of feature phones in the past, the requirements for power adapters are relatively simple and the output voltage level requirements are single. Generally, only a fixed output voltage is required. For example, power adapters in the monitoring industry generally require a 12V output voltage, and most consumer electronics products and feature mobile phone power adapters generally require a 5V output voltage. In the power adapter application of these products, there is no power transmission protocol identification, and the MCU is not required to control or intervene in the power chip. [0003] Times are changing, and the power consumption of smartphones with large screens has reached a new level. People's dependence on m...
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Login to View More IPC IPC(8): H02J7/00H02M3/00
CPCH02J7/007H02M3/00H02J2207/20H02M1/0003
Inventor 李仕炽谢宝森谢志斌钟裕捷李仕胜
Owner 北京鸿智电通科技有限公司