DC-DC active clamp converter
The invention relates to electrical engineering, in particular to single-ended DC voltage converters, and can be used in secondary power supply systems to convert, regulate and stabilize the DC output voltage that is galvanically isolated from the DC input voltage and to reduce dynamic losses.
The object of the invention is to generate a constant output voltage from a constant input voltage and reduce dynamic losses.
The device contains a transformer 2, the beginning of the primary winding 1 of which is connected to the positive pole of the input DC voltage source, and the end of the primary winding 1, through a power switch 3, implemented in the form of a MOSFET field-effect transistor, is connected to the negative pole of the input DC voltage source. A clamping element is connected in parallel to the primary winding 1 of the transformer 2, consisting of a series-connected capacitor 4 and an additional switch 5, implemented in the form of a MOSFET field-effect transistor. The anode of the rectifier diode 7 is connected to the beginning of the secondary winding 6 of the transformer 2, the cathode of which is connected to one of the terminals of the capacitor 8, the second terminal of which is connected to the end of the winding 6. The beginning of winding 6 is connected to the end of winding 9, the beginning of which is connected to the anode of diode 10, the cathode of which is connected to inductance 11 of the LC filter, the second terminal of which is connected to capacitor 12, which is the output capacitor of the LC filter, connected in series with capacitor 8, in parallel to which load 13 is connected. The cathode of the shunt diode 14 is connected to the common connection point of the inductor 11 and the rectifier diode 10, the anode of which is connected to the common connection point of the capacitors 8, 12. The control electrodes of switches 3,5 are connected to the pulse-width controller 15.
The invention relates to electrical engineering, in particular to single-ended DC voltage converters, and can be used in secondary power supply systems to convert, regulate and stabilize the DC output voltage that is galvanically isolated from the DC input voltage and to reduce dynamic losses.
There are known DC voltage converters with active clamping [1].
The disadvantage of the known DC voltage converter with active clamping is the absence of the possibility of switching the power switch to the zero current value, which leads to an increase in dynamic losses in the power switch when it is turned on, as well as the trapezoidal shape of the current through the power switch, which leads to an additional losses in the power switch in the conductive state and dynamic losses when it is turned off.
The closest technical solution to the proposed device is a DC voltage converter with active clamping is given in [1], containing the primary winding of the transformer, connected through a controlled power switch to the terminals of the input DC voltage source, parallel to which a clamping element is connected, composed of a series-connected capacitor and an additional switch, a transformer performing electrical isolation and obtaining the required level of constant output voltage, secondary windings connected through rectifier diodes to the input of the LC filter, to the output of which the load is connected.
The object of the invention is to overcome these disadvantages.
The objective is accomplished by the fact that in a DC voltage converter with active clamping, the primary winding of the transformer of which is connected through a power switch to the terminals of the input DC voltage source, parallel to which the clamping element is connected, and the two secondary windings of the transformer operate simultaneously on the time interval of the on state of the power switch, wherein the first of them through the rectifier diode is connected to the first filter capacitor, and the second, through the rectifier diode is connected to the input of the LC filter, the output capacitor of which is connected in series with the first filter capacitor, parallel to which the load is connected, and the input of the LC filter through the shunt rectifier diode is connected to the common connection point of the filter capacitors, parallel to which the load is connected.
The proposed DC voltage converter with active clamping, in comparison with the known device, allows you to generate a constant output voltage from a constant input voltage with a decrease in dynamic losses, making it possible to turn on the power switch to zero current and, as a result, reduce dynamic losses in the power switch when it is switching on and due to the squareness of the current in the conductive state when switching off.
Complete Specification
| Country | Current Status | Patent Application Number | Patent Applicant | Patent Number | Title | Google Patent Link |
| China | Patent Pending | 202480024979.8 | Polikarpov Vladimir Anatolyevich | DC-DC active clamp converter | Click to open |