A multi-state three-level boost circuit
A boost circuit and three-level technology, applied in the field of circuits, can solve the problems that the boost circuit cannot guarantee efficiency and power density, reduce sampling costs and control complexity, etc., to improve system power density, reduce size, improve efficiency effect
Active Publication Date: 2017-09-12
EMERSON NETWORK POWER CO LTD
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to provide a multi-state three-level boost circuit implemented by a multi-state switch for the defect that the existing boost circuit cannot reduce sampling cost and control complexity while ensuring efficiency and power density circuit
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[0048] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0049] see image 3 , is a circuit diagram of the first embodiment of the multi-state three-level boost circuit according to the present invention. like image 3 As shown, the multi-state three-level boost circuit provided by this embodiment includes: a DC voltage source Vin, a first boost inductor L1, a second boost inductor L2, a first bus capacitor C1, a second bus capacitor C2 and a control device (not shown in the figure). The first bus capacitor C1 and the second bus capacitor C2 are connected in series between the first main output terminal and the second main output terminal of the multi-state three-level boost circuit. The boosted direct current is output at the first main output terminal and the second main output terminal of the multi...
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The invention relates to a multi-state three-level boost circuit, comprising: a DC voltage source, a first boost inductor, a second boost inductor, a first bus capacitor, a second bus capacitor and a controller; The flat boost circuit further includes: a first multi-state switch and a second multi-state switch, the bridge arms of the first multi-state switch and the second multi-state switch are all controlled by the controller, according to the conduction state of each bridge arm A plurality of switch modes are formed differently, so that the multi-state three-level boost circuit presents three levels. The circuit of the present invention increases the frequency of the boost inductor and the DC bus capacitor while maintaining a low switching frequency, thereby reducing the size of the inductor and capacitor, improving the efficiency of the circuit, and improving the system power density, and the use of the multi-state switch makes the current The cost of sampling is low, and current sharing control is not required, and the complexity of the controller is greatly reduced.
Description
technical field [0001] The present invention relates to the technical field of circuits, and more specifically relates to a multi-state three-level voltage boosting circuit. Background technique [0002] Boost (Boost) circuit is used to convert low DC voltage to high DC voltage. The three-level topology is widely used because the voltage stress of the switching tube is only half of that of the two-level, which is beneficial to the selection of switching devices and reduces the size of the required inductor. [0003] see figure 1 , which is a circuit diagram of a common three-level boost circuit in the prior art. In this circuit, Vin is the DC input power supply, inductors L1 and L2 are boost inductors, switching tubes S1 and S2 are switching elements for boost control, diodes D1 and D2 are freewheeling diodes, capacitors C1 and C2 are bus capacitors, and are load R L powered by. The voltage stress of the switch tubes S1 and S2 is half of the bus voltage, so it is called...
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IPC IPC(8): H02M3/28
Inventor 武志贤
Owner EMERSON NETWORK POWER CO LTD