AC-to-DC voltage converter
The invention relates to electrical engineering, and more particularly to AC-to-DC voltage converters, and can be used in secondary power supply systems for power factor correction, conversion, and DC output voltage regulation.
It is an object of the invention to form a constant output voltage from an alternating input voltage, implement galvanic isolation between input and output circuits, combine the control circuits of the counter-series connected controlled switches, improve the performance of the power factor corrector, simplify the control circuit.
The claimed device contains a regulating switch (3), the control electrodes of which are combined into a common point connected to a control circuit (10), and a power transformer (2), a primary winding (1) of which is connected via the regulating switch (3) to a source of alternating voltage, and a secondary winding (4) of which is connected via rectifying diodes (5, 8) to series-connected filter capacitors (6, 7), to which a load (9) is connected in parallel.
In the proposed AC-to-DC converter, the beginning of the primary winding 1 of the transformer 2 is connected to the first pole of the input AC voltage source, and the end of the primary winding 1 via the controllable counter-series connected switch 3 is connected to the second pole of the input AC voltage source. The anode of the rectifier diode 5 is connected to the beginning of the secondary winding 4 of the transformer 2, the cathode of which is connected to one of the leads of the capacitor 6. Second lead of capacitor 6 is connected to end of winding 4. The end of winding 4 is connected to one of leads of capacitor 7 whose second lead is connected to anode of rectifier diode 8 whose cathode is connected to beginning of winding 4. The load 9 is connected in parallel to the series-connected capacitors 6 and 7. The control electrodes of the counter-series connected switch 3 are combined into a common point and connected to the pulse-width controller 10, the second output of which is connected to the common connection point of switches of the counter-series connected switch 3.
The invention relates to electrical engineering, and more particularly to AC-to-DC voltage converters, and can be used in secondary power supply systems for power factor correction, conversion, and DC output voltage regulation.
AC voltage regulators are known to directly connect the load via rectifier diodes and a smoothing capacitive filter [US Pat. No. 6,282,109 b1 28.08.2001].
The disadvantage of known AC voltage regulators is the absence of galvanic isolation between the source of input sinusoidal voltage and constant output voltage, as well as separate control of switches connected to the AC voltage circuit, which complicates the control circuit.
The most close in technical essence to the proposed device a regulator of alternating sinusoidal voltage into a constant output voltage, comprising a choke winding connected via counter-series connected controlled switches to terminals of a source of alternating sinusoidal voltage, rectifier diodes connected by anodes to output terminals of counter-series connected controlled switches, the cathodes of which are connected to the capacitive filter and load [FIG. 1 US Pat. No. 6,282,109 b1 28.08.2001].
The disadvantages of this regulator are that there is no galvanic isolation of the input and output circuits of the regulator, as well as separate switch control, which complicates the switch control device.
It is an object of the invention to form a constant output voltage from an alternating input voltage, implement galvanic isolation between input and output circuits, combine the control circuits of the counter-series connected controlled switches, improve the performance of the power factor corrector, simplify the control circuit.
This object is achieved by the fact that in the AC voltage regulator, a secondary winding is introduced to the primary winding of the choke connected in series with the AC voltage sources and the counter-series connected controlled switches, which is connected through the rectifier diodes to the capacitive filter and the load, and the control electrodes of the counter-series connected controlled switches are combined and the common electrode are connected to the control device.
The proposed AC-to-DC voltage converter allows, in comparison with the known device, allows to implement the electrical isolation of the output direct voltage from the alternating input voltage, as well as simplify the control of the counter-series connected switch 3 by combining the control electrodes to a common point.
Complete Specification
| Country | Current Status | Patent Application Number | Patent Applicant | Patent Number | Title | Google Patent Link |
| USA | Patent Pending | 19/153,541 | Polikarpov Vladimir Anatolyevich | AC-to-DC voltage converter | Click to open |