A kind of three-state boost circuit and modulation method thereof
A modulation method and circuit technology, applied in the field of electronics, can solve the problems of large loss of inductor core, inability of boost circuit to meet efficiency density, hard turn-off loss of synchronous rectifier tube, etc.
Active Publication Date: 2019-05-21
CHANGSHA VICTORY ELECTRICITY TECH
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Problems solved by technology
[0003] The traditional Boost circuit is widely used because it can realize the boosting effect. However, due to the large loss of the magnetic core of the inductor and the hard turn-off loss of the synchronous rectifier, the traditional Boost circuit cannot meet the requirements of extremely high efficiency density. application
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[0060] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0061] figure 1 It is a tri-state Boost circuit diagram provided by an embodiment of the present invention, including:
[0062] A first branch, a second branch, a third branch and a fourth branch, the first branch is connected in parallel with the second branch, the second branch is connected in series with the third branch, The fourth branch is connected in parallel with the third branch;
[0063] Wherein, the first branch includes: a capacitor and a rectifier, the capacitor and the rectifier are connected in series;
[0064] The second branch circuit includes: a power switch tube;
[0065] The third branch includes: a first inductor;
[0066] The fourth branch circuit...
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The invention provides a tristate Boost circuit and a modulation method thereof. The method comprises the following steps: turning on a power switch tube and a bidirectional switch tube; when current flowing through a second inductor is zero, turning off the bidirectional switch tube; when current flowing through a first inductor reaches a maximum state, turning off the power switch tube, so that a rectifier tube is switched on; turning on the bidirectional switch tube at a preset moment before the end of switch-on of the rectifier tube; and when the current flowing through the second inductor is equal to the current flowing through the first inductor, turning off the rectifier tube and ending modulation. Improvements are made on the basis of a conventional Boost circuit, and the modulation method of the tristate Boost circuit is provided, so that continuous current flow is kept inside the inductors, thereby lowering the ripple current of the inductors, reducing magnetic core loss, and increasing the efficiency of the Boost circuit.
Description
technical field [0001] The present invention relates to the field of electronic technology, and more specifically, to a three-state Boost circuit and a modulation method thereof. Background technique [0002] At present, with the increasing energy crisis, it is necessary to have a higher efficiency power supply. In low-voltage and high-current situations, the switching tube loss and inductor current loss constitute the vast majority of the circuit loss. Reducing this part of the loss will save a lot of heat loss. Security matters. [0003] The traditional Boost circuit is widely used because it can realize the boosting effect. However, due to the large loss of the magnetic core of the inductor and the hard turn-off loss of the synchronous rectifier, the traditional Boost circuit cannot meet the requirements of extremely high efficiency density. application. Contents of the invention [0004] The present invention provides a tri-state Boost circuit and a modulation metho...
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IPC IPC(8): H02M3/158
CPCH02M3/1588
Inventor 董密万江湖谭汝雅杨建王辉粟梅
Owner CHANGSHA VICTORY ELECTRICITY TECH