Multi-level boosted circuit and device and system thereof

A step-up circuit and multi-level technology, applied in control/regulation systems, output power conversion devices, electrical components, etc., can solve the problems of easy control of the bus voltage and easy breakdown of the lower arm switch tube, etc., to achieve The effect of reducing the probability of electric shock accidents

Pending Publication Date: 2020-03-31
厦门科华数能科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the above-mentioned technical problems, and provide a multi-level boost circuit and its device and system, which can at least solve the problem that the lower arm switch tube is easily broken down when the power is turned on, and does not affect the normal operation of the circuit. Bus voltage is easy to control

Method used

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  • Multi-level boosted circuit and device and system thereof
  • Multi-level boosted circuit and device and system thereof
  • Multi-level boosted circuit and device and system thereof

Examples

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Embodiment 1

[0067] refer to figure 2 , Embodiment 1 of the present invention provides a three-level boost circuit, which has an input terminal and an output terminal. The input end includes a first input end and a second input end, and the output end includes a first output end and a second output end.

[0068] Generally speaking, the boost circuit of this embodiment can be used in various application scenarios, so its input terminal can be coupled with various power input devices to receive power input therefrom. In each embodiment of the present invention, the application scenario in the field of photovoltaic power generation is used as an example for introduction. Therefore, the input terminal of the boost circuit is coupled to the photovoltaic module PV1, which converts light energy into DC power and then inputs it to the boost circuit. Boost for efficient use of light energy. The positive pole of the photovoltaic module PV1 is connected to the first input terminal, and the negativ...

Embodiment 2-6

[0090] refer to Figure 3-7 , which respectively correspond to Embodiments 2-6 of the present invention, which are all improved on the basis of Embodiment 1, aiming at solving the problem that after Embodiment 1 introduces the first TVS tube TVS1 configured as a unidirectional TVS tube, Because it is equivalent to an ordinary diode when it works in the forward direction, under the condition of low input voltage, the midpoint voltage of the bus can be transmitted to the input terminal through the body diode of the first TVS transistor TVS1 and the first controllable switch Q1, which is easy to cause the The problem of electric shock accidents.

[0091] image 3 In the illustrated embodiment 2, the fourth branch is further provided with a third diode D3, the cathode of which is connected to the cathode of the first TVS transistor TVS1, and the anode of which constitutes the first end of the fourth branch. In the case of the low input voltage, through the reverse cut-off of the...

Embodiment 7-8

[0096] refer to Figure 8-9 , which respectively correspond to Embodiment 7-8 of the present invention, which are all in image 3 The improvement on the basis of the illustrated embodiment 2 aims to solve the problem that the second diode D2 is easily broken down under the condition of low input voltage.

[0097] It can be seen that the circuit further includes a fifth branch on which a fourth diode D4 is arranged, for the input voltage between the first input terminal and the second input terminal is lower than the start-up voltage of the booster circuit When , that is, in the case of the low input voltage, the common point of the first diode D1 and the second diode D2 is clamped.

[0098] One end of the fifth branch is connected to the common point of the first diode D1 and the second diode D2, and the other end can be connected to the second end of the fourth branch, or can be connected to the first diode D2. A common point of the TVS transistor TVS1 and the third diode D...

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Abstract

The invention discloses a multi-level boosted circuit, and a device and a system thereof. TVS tubes are arranged between an output node and a first capacitor as well as between the output node and a second diode, and other auxiliary devices are matched, so that the problem that a lower arm switching tube is easy to break down during power-on can be solved, the breakdown problem of the second diodeunder the condition of low input voltage can also be solved, the model selection of related devices is easier, and the cost is lower; moreover, after corresponding devices are added to the circuit, the normal boosting process is not affected, the voltage at the output end is easy to control, Meanwhile, the probability of electric shock accidents when the input end is operated is also reduced.

Description

technical field [0001] The invention relates to the technical field of circuit boosting, and more specifically, relates to a multi-level boosting circuit and its device and system. Background technique [0002] The input voltage of the photovoltaic power generation system is gradually increasing, and it has been raised to 1500V at present. Considering the cost and other factors, the pre-stage boost circuit of the photovoltaic inverter is usually changed from a two-level to a three-level circuit. Such as figure 1 When the flying capacitor type three-level boost circuit shown is initially powered on, since the voltage on the flying capacitor C1 is zero, the lower arm switching tube Q2 will bear all the input voltage, which may easily cause damage to the switching tube Q2 . [0003] In addition, the above-mentioned boost circuit has another defect, because when it is applied in the field of photovoltaic power generation and forms a distributed photovoltaic power generation sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/32H02M7/483H02J3/38
CPCH02M1/32H02M3/158H02M7/483H02M3/07H02M1/0095
Inventor 陈书生曾春保苏先进
Owner 厦门科华数能科技有限公司
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