SU588603A1 - Ac-to-dc voltage converter - Google Patents

Description

one

This invention relates to a converter technique and can be used for charging capacitor storage devices.

Current-to-constant voltage converters are known that contain rectifier and linear limiting chokes, which can be switched on either before the rectifier or after it. A device with a choke connected before the rectifier is characterized by the presence of reactive currents in the supply circuits, which leads to a decrease in efficiency, an increase in the installed power of the power supply and the need to include additional elements B when capacitors are charged from a constant voltage source through a voltage converter ( inverters in inverter, filter capacitors). Devices with a choke connected after the rectifier have significant weight and dimensions of the throttle, if the rectifier is uncontrollable, the current consumption pauses, the sum of which is more than half of the storage capacitor charging time, and the complicated control circuit, if the rectifier or inverter power supply from a constant voltage source) -controllable. The closest to the invention is an alternating voltage converter into a constant voltage containing a rectifier assembled according to a bridge circuit, in two adjacent arms of which linear chokes are connected in series with the valves.

The proposed device differs from the known one in that both drossel are included in the shoulders connected to one of the output pins of the bridge. This makes it possible to increase the efficiency of the device by eliminating the flow of reactive currents on the alternating voltage side.

The drawing shows a diagram of the proposed device.

It contains four valves 1, 2, 3 and 4, a storage capacitor 5 and two throttles 6 and 7.

Claims (1)

Let the moment of application of the alternating voltage to the input of the device coincide with the beginning of the half-period of the voltage at which terminal a is positive and terminal b negative. In the circuit there is an increasing current in the circuit: terminal a, throttle 6, valve 2, storage capacitor 5, valve 3, terminal b. When this happens, capacitor 5 is charged and energy is accumulated in choke 6. When the input voltage is misaligned, a current arises along the circuit: terminal b, inductor 7, fan-capacitor 5, valve 1, terminal a, which continues to charge the regulator 5 and creates an energy reserve in the choke 7. Simultaneously, the discharge current of the throttle b through the circuit flows in the rectifier gradually: the choke 6, the septile 2, the capacitor 5, the valve 1, which decreases to a certain value or zero by the end of the half period depending on the voltage condenser. When the potential of terminal a becomes positive again, the choke 7 is discharged along the circuit of elements 7–4–5–3 to capacitor 5, and the choke 6 begins to be charged by the input current along the circuit of the following elements: a-6-2-5-3-b . Further, the processes are periodically repeated. The input variable voltage may be sinusoidal, rectangular, or quasi-right-angled. When adjusting the frequency of the input nanowire, the rectifier stabilizes the charging current of the capacitor 5. 7/4 To reduce the frequency control range or to limit the current buildup at the beginning of the charging process, a differential rectifier with a stepped output voltage can be applied, in which throttles are included similarly. Claims of an alternating voltage converter into a constant voltage containing a rectifier assembled according to a bridge circuit, in two adjacent arms of which linear chokes are connected in series with the valves, characterized in that, in order to increase efficiency, both throttles are included in the shoulders connected to one of the output pins of the bridge. 0