Quasi-resonant buck-type converter of continuous high-frequency voltage
A technology of voltage converter and DC voltage, which is applied in the direction of high-efficiency power electronic conversion, conversion of DC power input to DC power output, output power conversion device, etc., which can solve the problem of inability to minimize the size of the converter and the impact of this stable output load , Adjusting the speed limit, etc.
Active Publication Date: 2019-09-13
3D PLUS
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Problems solved by technology
According to the regulation principle implemented in the prior art, the regulation speed is limited by the speed of the error amplifier and the stability margin for stable control of the output voltage
This stability may also be affected by the nature of the output load (user's choice)
In order to have a stable system, the maximum regulation speed is fixed at the design stage and cannot be improved by user's choice (e.g. adding an output capacitor)
This type of regulation leads to a compromise that needs to be compensated by increasing the output capacitance and does not minimize the size of the converter
Method used
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[0043] In the following description, the terms switch and transistor are used interchangeably. Likewise, the converter's output voltage is sometimes identified as Vout and other times as the converted voltage level.
[0044] figure 2 A buck converter according to one embodiment of the invention is shown. In this embodiment, only the "ON" phase of the converter has a predetermined constant duration. The latter (which corresponds to the closure duration of the first switch Qhs) is calculated to obtain soft switching, in other words, at closure, switching occurs at zero current due to the presence of the resonant inductor Lr in series, at When off, switching occurs when the current in the switch is negative and therefore flows into the diode in parallel. The converter has an input port 201 designed to receive the voltage level to be converted and an output port 206 capable of supplying the converted voltage level. The input port 201 includes first and second terminals, 202 a...
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A Buck-type quasi-resonant continuous voltage converter comprising an input gate (201) having a first terminal (202) capable of receiving a voltage level to be converted, an output gate (206) having afirst terminal (204) capable of supplying a converted voltage level, a first switch (Qhs) connected in series to said first terminal of the input gate and a regulating circuit (211) configured for: -generating a voltage ripple (Ond), increasing or decreasing according to a state of closure or opening of said first switch; - generating a setpoint signal (Vcons) proportional to a difference between an average converted voltage level and a reference voltage (Vref); - carrying out a first comparison (210) between the setpoint signal and said converted voltage level (Vout) to which said voltage ripple has been added; and - depending on the result of the first comparison, generating or otherwise, on its output, an activation signal (Hs_Cmd) controlling the closure of said first switch during apredefined period (Ton).
Description
technical field [0001] The field of the invention is that of switching power supplies. More specifically, the present invention relates to a quasi-resonant step-down non-isolated DC / DC voltage converter, especially a quasi-resonant step-down non-isolated DC / DC voltage converter for point-of-load regulator applications. DC voltage conversion is used in many technical fields where there is a need to convert the supply voltage of devices, such as converting the voltage delivered from the battery of a laptop computer to the processor, and from the battery of a laptop computer to the The voltage of the application operating in the environment (for example, the environment of the space application) is converted. Background technique [0002] In general, the function of a DC / DC voltage converter at its output is to increase or decrease the voltage at its input in order to power devices located downstream. figure 1 A buck converter according to the prior art is shown. The convert...
Claims
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IPC IPC(8): H02M3/156
CPCH02M3/156H02M3/158Y02B70/10H02M1/0025H02M1/0058H02M1/0061H02M3/1582
Inventor P·迪比N·佩罗
Owner 3D PLUS