RU1774318C - Pulse-operated dc voltage regulator - Google Patents

Abstract

Usage: in secondary power supply devices. The inventive device comprises a power transistor (5), a transformer (4) with primary (1), additional (2), secondary (3) and switching (18) windings, a rectifier diode (6), a DLC filter on elements 7 , 8 and 9, the inductor of which is double-wound, the control unit (10), an additional power transistor (17), limiting resistors 14 and 19, a magnetization reversal transistor 13, a storage inductor and capacitor 14 and 19, a magnetization reversal transistor 13, a storage inductor and an input capacitor filter (11). The device is characterized by improved overall dimensions due to the reduced dimensions of the DLC filter. Energy enters the load (15) through two circuits; through the transformer (4) and the first winding of the throttle (8) and through the power transistor (17) and the second winding (16) of the throttle (8). As a result of the addition of the voltages supplied to the input of the filter, the amplitude of the variable component of the filtered voltage decreases. 1 ill. / C 1 J Jb. w to

Description

The invention relates to electrical engineering and can be used in automation power supplies.

Known are pulse stabilizers built on the basis of single-phase converters with a demagnetizing winding (Moin BC, Laptev N.N., Stabilized Transistor Converters, M., Energi, 1972, p. 192; Electronic Engineering in Automation, under the editorship of Yu.I. Konev, M, Energie, Issue 11, 1980, p. 25), in which, due to the core operating in a private hysteresis cycle, the core of the power transformer is not rationally used. The mass and weight of the core is actually much larger than in push-pull converters, the output throttle is not rationally used, which works with long magnetization, which worsens its mass-dimensional characteristics (MHP), the partial modulation is not implemented in the circuits, which reduces the MHP of the output filters.

Known pulsed constant voltage stabilizer according to the author's certificate N ° 902011. This one-phase pulsed voltage stabilizer with a demagnetizing winding works by limiting the voltage level on the collector of the power transistor at the level of 2En, which helps to reduce the level of high-frequency interference, allows to increase the duty cycle of the pulse stabilizer with demagnetizing winding.

The disadvantage of such a stabilizer is the irrational use of the material of the core of the power transformer, which operates by private hysteresis, which leads to an overestimation of the mass and volume of the power transformer. In such a circuit, there are through currents along the output circuits, which reduces the efficiency and MHP of the device. Partial modulation is not implemented in the stabilizer, which degrades the MHP of the output filter and the stabilizer as a whole. The output choke works by magnetizing, which reduces its IHL.

Of the known pulsed constant voltage stabilizers, the closest in technical essence is a pulsed constant voltage stabilizer for autowork. No. 1597868, class G 05 F 1 / 46.1988. A single-phase constant current stabilizer contains a power transformer, a primary winding, an additional winding, a secondary winding, an output filter capacitor, a rectifier diode, a recovery diode, an output inductor, an output capacitor, a magnetization reversal transistor, a limiting resistor, a storage

throttle control unit. The end of the primary winding is connected to the collector of the power transistor, the emitter of which is connected to a common bus. The beginning of the secondary winding is connected to the rectifier diode anode, the cathode of which is connected to the recovery diode cathode, and through the output inductor to the positive output output of the stabilizer. The end of the secondary winding and the anode of the recovery diode are connected to the negative output terminal of the stabilizer, an output capacitor and an input of the control unit are connected in parallel with the output terminals, output

which is connected in parallel with the control input of the transistor. The beginning of the primary winding is connected to the end of the additional winding and the storage choke, the beginning of the magnetization reversal transistor, the base of which is connected through the limiting resistor to the middle terminal of the storage choke. The collector of the magnetization reversal transistor is connected to the start of the auxiliary winding. Start

the primary winding through the capacitor of the input filter is connected to a common bus of the primary source.

The disadvantage of this device is the efficiency of using the output

Throttle, which works with strong magnetization, which reduces its IHL and IHL of the entire device. The lack of partial modulation in the implementation of the operating principle emphasizes the presence of large reserves in the prototype to improve its IHL as a whole.

An object of the invention is to improve the MHP of a pulse stabilizer.

This goal is achieved by the fact that in the pulse stabilizer containing the primary, secondary and secondary windings of the power transformer, a rectifying diode, a recovery diode,

an output choke, an output capacitor, a control unit, an input filter capacitor, a storage choke, a magnetization reversal transistor and a terminating resistor, are additionally introduced: an additional winding of the output inlet, a second power transistor, a switching winding of the power transformer and a limiting resistor, with the beginning of the additional winding connected to the positive the output terminal of the stabilizer, and the end to the collector of the second power transistor, the emitter of which is connected to the input terminal stabilizer and output circuit of the second power transistor. Through a limiting resistor

a switching winding is turned on beginning to the base of the second power transistor.

Thanks to new elements and communications, the device provides an increase in specific indicators by 20%.

The invention is illustrated in the drawing, which shows a simplified diagram of the proposed device.

The proposed stabilizer, as well as the prototype, contains primary 1, additional 2 and secondary 3 windings of transformer 4, power transistor 5, rectifier diode b, recovery diode 7. output inductor 8, output capacitor 9, control unit 10, capacitor an input filter 11, a storage choke 12, a magnetization reversal transistor 13. a limiting resistor 14, output terminals to which a load 15 is connected.

The end of the primary winding, 1 of the transformer 4 is connected to the collector of the power transistor 5, the emitter of which is connected to the first input terminal, the beginning of the secondary winding 3 is connected to the anode of the rectifying diode 6, the cathode of which is connected to the cathode of the recovery diode 7 and the beginning of the first winding of the output cross-link 8, the end of which is connected to the first output terminal of the stabilizer. The end of the secondary winding 3 and the anode of the recovery diode 7 are connected to the second output terminal of the stabilizer. The output capacitor 9 is connected in parallel to the output terminals of the stabilizer and the input of the control unit 10, the output of which is connected to the control input of the transistor 5. The beginning of the accumulator interconnector 12 is connected to the second output of the stabilizer and the emitter of the magnetization reversal transformer 13, the base of which is connected through the limiting resistor 14 to the middle output of the accumulator throttle 12. The collector of the magnetization reversal transistor 13 is connected to the beginning of the additional winding 2. The beginning of the primary winding 1 through the input filter capacitor 11 with one with the first input terminal.

Unlike the prototype, the proposed device includes: an additional winding 16 of the output throttle 8, a second power transistor 17. a switching winding 18 of the transformer 4 and a limiting resistor 19, and the beginning of the additional winding 16 is connected to the first output terminal of the stabilizer, and the end to the collector the second power transistor 17, the emitter of which is connected to the second input terminal of the stabilizer. To the input circuit of the second power

a transistor 17 is connected via a limiting resistor 19 to the base of the second power transistor 17 with a start winding 18.

The proposed device operates as follows.

When the regulating transistor 5 is open, energy is transferred through the power transformer 4 to the secondary circuit formed by the secondary winding 3, the rectifier diode 6, the output choke 8, the resistance of the input load circuit 15, shunted by the capacitor 9, and the energy is accumulated in the transformer, while The driving transistor 13 is closed.

When the power transistor 5 is closed, the voltage polarity changes between the beginning and the midpoint of the accumulator throttle 12, which, through the limiting resistor 14, opens the magnetizing transistor 13, while the energy stored in the accumulator choke provides magnetization of the transformer along the additional winding circuit 2 and the emitter of the magnetizing transistor 13. Moreover, in addition to ensuring the magnetization reversal of the transformer, the storage choke 12 is also partially magnetized.

Almost simultaneously with the unlocking of the remagnetizing transistor 13, the second power transistor 17 also opens. After the power transistor 5 is turned off, the EMF on the switching winding 18 of negative polarity is supplied to the base of the transistor 17, and of a positive polarity through the limiting resistor 19 to its emitter. After closing the power transistor 5 and unlocking the transistor 17, the difference between the input and output voltage is applied to the additional winding 16 of the output choke 8. The number of turns and inductance of this winding significantly exceeds the number of turns of the main winding. In this case, a more intensive remagnetization of the core of the output throttle and replenishment of electric energy directly from the first source of the output capacitor 9, which significantly slows down the discharge process of the capacitor 9 and provides the necessary level of ripple of the output voltage with a significantly smaller capacitance of the output capacitor 9 and smaller dimensions and the mass of output throttle. Next, the operation cycle is repeated.

The dimensions of the output throttle are reduced due to the fact that the amplitude of the first

harmonics of the voltages supplied to the input of the output filter formed by the inductances of the windings of the output drossel 8 and the capacitance of the capacitor 9.

Electric energy is supplied to the load through two channels: through a power transformer 4, the first winding of a double-winding throttle and through a power transistor 17 and a winding 16 of a double-winding throttle 8. These two energy paths form two sequences of voltage pulses. At the load, these two pulse sequences add up to form a constant and a variable component. Moreover, the amplitude of the variable component is many times smaller than the amplitude of each sequence separately.

The presence of a constant component in the voltage and a corresponding decrease in the amplitude of the variable component of the filtered voltage, requires a lower suppression coefficient of the output filter, and therefore a lower value of the inductance of the windings of the double-winding intercourse 8 and the capacitance of the 9. A lower value of the inductance of the windings of the intercourse requires respectively smaller cross-section of the iron core.

In addition, the core of a double-winding throttle operates on an extended loop remagnetization cycle than in a conventional LC filter, when one pulse sequence is fed to it. It also significantly reduces the required steel cross section of the core of the Drossel 8 core.

Magnetization of the core of the magnetic circuit of the output throttle over an extended cycle is carried out due to the presence of a second winding 16 of the throttle 8.

magnetic flux generated by the current flowing through the winding and actively magnetizes the core.

Thus, in the proposed device, thanks to the introduction of new elements and connections, the pulse stabilizer with partial modulation and the magnetization reversal over the extended hysteresis loop of the core of the output filter interfering is ensured, which allows reducing the weight and dimensions of the LC filter of single-ended voltage converters by 40% wives (SNP) and, as a result, 25% improve the IHL of the arresters themselves.

Claims (1)

The invention is characterized by the fact that, in order to improve the overall dimensions, an additional power transistor and an additional limiting resistor are introduced into it, the transformer is equipped with a switching winding, and the DLC filter choke is double-wound, moreover, the beginning of the first winding of the drossel of the DLC filter is connected to the cathode of the rectifier diode, and the end is connected to the first output terminal, to which the beginning of the second winding of the drossel of the DLC filter is connected , the end of the additional power transistor connected to the collector, the emitter of which is connected to the second input terminal and, through the additional limiting resistor, to the end of the switching winding, the beginning of which is connected to the base of the additional power transistor, while the conductivity type of the additional power transistor is opposite to the conductivity type of the power transistor.