A Step-Up-Buck Converter
A step-down converter and node technology, applied in the direction of output power conversion devices, instruments, DC power input conversion to DC power output, etc., can solve the problems of high cost, high price, large conduction resistance, etc., and achieve energy improvement Conversion efficiency, high energy conversion efficiency, effect of reducing conduction loss
Active Publication Date: 2017-06-06
WUXI ZGMICRO ELECTRONICS CO LTD
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Problems solved by technology
[0007] From the above description, it can be known that the four switching devices used in the existing converter realize the conversion of the energy storage and release of the inductor, but multiple switching devices bring the defects of complex circuit structure and high cost
At the same time, each switching device has an on-resistance, and the current flowing through the switching device will cause energy loss
In addition, usually the switches S1 and S4 need to be composed of PMOS transistors, because of their large on-resistance and high price, which also makes the converter have a higher cost
Method used
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Embodiment 2
[0032] The working process of the second embodiment is as follows: In the first stage, the switch S21 is turned on, the switch S22 is turned off, the inductor L21 stores energy, the current flows from the power input node VIN through the inductor L21, and then flows to the ground, and the switch S22 is turned off at this time. Open, that is, in the blocking state, blocking the loop between the film input node VIN and the output negative node VON; in the second stage, the switch S21 is turned off, the switch S22 is turned on, the inductor releases energy, and the current flows from the power supply input node VIN to The inductor L21 flows to the switch S22 through the load Load2 and the output capacitor C22. At this time, the switch S22 is turned on, and the current returns to the power input node VIN through the switch S22 to form a loop for releasing energy. The voltage conversion formula is also the same as that of Embodiment 1, and will not be repeated here.
[0033] Among ...
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The present invention relates to a boost - buck converter includes a power input node, an inductor, an input capacitor and an output capacitor, said input capacitor is connected between the power input node and ground, further comprising a first switch , a blocking element, a positive output node and an output node of the negative electrode, the inductor is connected between the positive power supply input node and an output node, the output capacitor is connected between the positive output node and an output node of the negative electrode, the first switch is connected between the output node and the cathode, the blocking element is connected between the input node and the output negative power input node, the input node from the block into the circuit between the output node of the negative electrode when the inductive storage. The present invention is achieved with fewer switching boost - down effect, not only can the cost be reduced, but also reduces the use of the switch conduction loss is generated, thereby improving the energy conversion efficiency.
Description
technical field [0001] The present invention relates to a step-up-buck converter. Background technique [0002] In some applications, a voltage converter is usually required, which can simultaneously realize the step-up and step-down functions of the input power supply. A practical example is a power supply formed by three lithium batteries connected in series. When the lithium battery is fully charged, the voltage of each battery is 4.2V. When it is continuously discharged, its voltage will drop to 3V, so that the voltage range of each battery is 3~4.2V , three series connection is 9 ~ 12.6V, that is, the input power supply voltage varies between 9V ~ 12.6V; if the load is 3 series LED lights, the conduction voltage of each LED is 3.5V, you need to input 10.5V voltage to drive normally. Therefore, when the power supply voltage is between 10.5 and 12.6V, the converter needs to work in step-down mode to drop the power supply voltage to 10.5V; when the power supply voltage i...
Claims
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IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD