SU1436104A1 - A.c. voltage stabilizer - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the power supply circuits of electronic and other devices. The purpose of the invention is to improve the shape of the output voltage curve and increase the accuracy of the Stabilivia at idle and in / close modes. In order to implement the algorithm of the stabilizer operating in the mode of voltage booster, short and voltage, it is necessary to ensure that the keys 6, 16 are switched off at any point in the half period, i.e. they must be fully manageable. The capacitors 22 and 23, connected in parallel to the keys 5 and 16, respectively, 5 provide a smooth change in the transformation ratio of the regulator made on the voltage transformer 1, eliminate the abrupt change in the output voltage. Due to the small distortion of the shape of the output voltage curve in the stabilizer, the output voltage is simultaneously stabilized by the amplitude, effective and average values. 1 sludge. i

Description

: The invention relates to electronics and can be used in power supply circuits for video electronic and other devices.

The purpose of the invention is to improve the shape of the output voltage curve and improve the accuracy of stabilization at idle and in modes close to it.

The drawing is a schematic diagram of a variable voltage regulator.

: The stabilizer contains a voltage transformer 1 in which oCjMOTKa 2 is connected to the primary and input- HbJM and output terminals and the windings 3 and 4 are connected in-series. The free voltages of the windings 4 and | 3, respectively, through the keys 5 and 6 in the full, for example, in the form of a DC bridge on the two diodes 7 and 8.1, two thyristors 9 and 10 and on four diodes 11-14, which are bridged by a transistor 15, are connected to the second input terminal, and the common you Zod windings 3 and 4 is connected to the first s input terminal. In parallel with the windings 3 and 4, a switch 16 is connected, made, in the form of a DC bridge on diodes 17-20, shunted by a transistor 21, In parallel to the tractors 5 and 6, resistance elements are made on capacitors 22 and 23, respectively. A source of alternating voltage can be an input or output of a stabilizer or any other source. The control inputs of all keys are connected to control block 24

The stabilizer works as follows.

If the network voltage is higher than the rated output voltage, then at the beginning of each half-period of the input voltage, the transistor 2 of the control key 16 is turned on. Turning on the latter causes the windings to be shorted and the output voltage is almost equal to the network voltage. From the shift time, the determined output deviation value . the voltage from the nominal, from the control unit 24, the control signal is removed from the transistor 2 of the key 16. In this case, none of the keys is closed and the capacitors of the capacitors 22 and 23 begin to recharge. At the moment of time when the capacitor capacitance 22 is str

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:-( OBIT equal to zero, the thyristor 9 or 10 of the key 5 is turned on from the control unit 24. Turning on the key 5 provides the connection of the winding 4 to the alternating voltage source, while the voltage on the output of the stabilizer is lower than the mains voltage.

If the mains voltage is lower than the rated voltage, then at the beginning of each half-cycle of the input voltage, transistor 15 of switch 6 is turned on. Turning on this transistor provides connection of the winding 3 to the alternating voltage source, as well as the operating mode on the voltage boost.

If the network voltage is greater than the minimum, with a time shift, determined by the magnitude of the output voltage deviation from the nominal, the control pulse from the transistor 15 is removed from the block 24 and, starting from this moment, neither. one of the keys is not closed until the voltage passes to the capacitor 23 through zero. At the moment when the voltage goes across the capacitor 23 capacitor 23, the transistor 21 of the switch 16 is turned on and the shorting windings 3 and 4 with the switch 16 are provided. In this case, the voltage at the output of the stabilizer is almost equal to the network voltage. Thus, the output voltage of the stabilizer is maintained equal to the nominal.

The stabilizer operation mode is possible when the key 6 is turned on at the beginning of each half-period, and after the key 6 is turned off, when the voltage goes to the capacitor 23, the key 16 turns on, after the key 16 is turned off, when the voltage goes to the capacitor 22, key 0 is turned on zero. At idle and in modes close to it, regardless of key 5 being turned on, the presence of a closed circuit containing an element of resistance, in this case the capacitor 22 capacity, ensures the operation of the booster in these modes transformer on voltvBGcheto Work keys 6 and. 16 in these directions does not differ from work under load.

To implement the stabilizer operation algorithm (transition from the rltobank mode to short circuit and from short circuit to voltage reduction), it is necessary to provide key 6 and 16 in

Any half point point, i.e. they must be fully manageable.

If, instead of diodes 13, 14 and 19, 20, thyristors are applied, the reliability of keys 6 and 16 is improved due to the redistribution of voltages between thyristors and transistors 15 and 21 in the off state of step transitions and the introduced nonlinear distortions are reduced.

Claims (1)

Formula of the invention Variable Voltage Stabilizer Containing Voltage Supplement SRI. Voltage on the private key de-jq transformer, three semiconductor There is a gap between the closed transistor and one of the thyristors, which reduces the voltage on each element. In addition, the device provides simultaneous stabilization of the output voltage with respect to amplitude, effective, and average values. The capacitors of the capacitors 22 and 23 provide a smooth change in the transformation ratio of the regulator, exclude a step-wise change in each voltage. The size of the capacitors of the capacitors 22 and 23 depends on the size of the subranges compensable changes in the input voltage and with the fact that, in order to improve the voltage and from the given value of the ko-shape of the output voltage curve nonlinear distortions. and an increase in the accuracy of stabilization on Technical and economic efficiency-idle and in modes close to the ability of the proposed stabilizer This means that, thanks to the keys, the keys are fully controlled by the fully controllable keys, and parallel to the first and three-time switches on the capacitor key, the entered output voltage by smoothing-capacitors. the key and the control unit of these keys, the input connected to the output pins, the secondary winding of the booster transformer included between the first input and output pins, and the two primary windings are connected in series, their free outputs through the first and second semiconductor switches are respectively connected to the second input terminal and the third semiconductor switch outputs, and the common output of the primary windings is connected to the first input terminal, which is different, second and third semiprivodniko