A boost power conversion circuit, method, inverter, device and system
A technology of conversion circuit and voltage control circuit, which is applied in the output power conversion device, the conversion of DC power input to DC power output, and the conversion of AC power input to DC power output, etc., can solve the problems of difficult diode selection and high device cost. , to achieve the effect of convenient selection and reduction of voltage stress
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Embodiment 1
[0077] see Figure 13 , which is a schematic diagram of a boost power conversion circuit provided in an embodiment of the present application.
[0078] The boost power conversion circuit provided in this embodiment includes: a first switch tube T1, a second switch tube T2, an inductor L, a flying capacitor Cfly, a first diode D1, a second diode D2 and a voltage control circuit 300.
[0079] The inductance L, the first diode D1 and the second diode D2 are sequentially connected in series to form a first branch circuit, and the first branch circuit is connected in series with the input positive pole and the input negative pole of the step-up power conversion circuit to form a main circuit; The inductance L, the first switching tube T1 and the second switching tube T2 are connected in series to form a first closed loop, and the first switching tube T1, the second switching tube T2, the first diode D1 and the The second diode D2 forms a second closed loop; one end of the flying ...
Embodiment 2
[0091] see Figure 14 , which is a schematic diagram of another boost power conversion circuit provided by the embodiment of the present application.
[0092] In this embodiment, the voltage control circuit includes at least a controllable switch as an example. The controllable switch can be a relay, a contactor, a semiconductor switch or a reverse conduction switch. The semiconductor switch includes a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor, and the reverse conduction switch includes a metal oxide semiconductor field effect transistor or a reverse conduction insulated gate bipolar transistor. When the controllable switch is a relay or a contactor, the normally closed type can be used, that is, when there is no input source, it is in the closed state; when it is powered on, it is in the open state.
[0093] For semiconductor switches and reverse conduction switching tubes, a controller is required to control their switching st...
Embodiment 3
[0110] see Figure 17 , which is a schematic diagram of another boost power conversion circuit provided in the embodiment of the present application.
[0111] The voltage control circuit in the boost power conversion circuit provided by this embodiment includes at least a third diode D5.
[0112] The anode of the third diode D5 is connected to the reference point, and the cathode of the third diode D5 is connected to the common point of the first diode D1 and the second diode D2.
[0113] Here's how it works after adding S:
[0114] The input terminal of the step-up power conversion circuit has not been powered on (V in = 0) but the voltage of the bus has been established, for example, the output sides of multiple boost power conversion circuits are connected in parallel and share the same bus, and other circuits have been powered on, but this boost power conversion circuit has no input voltage V in . If D5 is not added, the flying capacitor voltage V Cfly and the input v...
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