SU1480054A1 - Dc-to-dc voltage converter - Google Patents

Abstract

The invention relates to converter equipment and is intended for charging high-capacity storage capacitors. The purpose of the invention is to improve the mass and size parameters by increasing the conversion frequency. The converter contains thyristors 1.6, thyristors 2.4 are connected in series between the power supply terminals, and thyristors 3.5 in series between the anode of the thyristor 6 and the cathode of the thyristor 5. Between the connection points of thyristors 2.4 and 3.5, respectively, choke 7, and between the point of connection of thyristors 3.5 and the average output of the power supply is capacitor 8. The cathode of thyristor 1 and the anode of thyristor 6 are connected to the average output of the power supply, respectively, through primary passages of inductive drives 9,10. The secondary windings of the accumulators 9,10 through rectifying diodes 11, 12 are connected to the storage capacitor 13. In the circuit, the accumulation-reset cycles repeat at a certain frequency. The next pumping of accumulator 9 begins at the moment of the fall to its zero discharge current. 3 il.

Description

(21) 4284101 / 24-07

(22) 05/19/87

(46) 05/15/89. Bul Number 18

(71) Istra branch of the All-Union Electrotechnical Institute

them. V.I. Lenin

(72) Vl. G. Filippov and V. G. Filippov

(53) 621.314.57 (088.8)

(56) USSR Author's Certificate No. 412674, cl. H 02 M 3/315, 1972.

Bulatov O. G. and others. Semiconductor charging devices of capacitive energy storage. M .: Radio and Communications, 1986, p. 45, fig. 3.36.

(54) CONSTANT VOLTAGE CONVERTER TO PERMANENT

(57) The invention relates to converter technology and is intended to charge high-capacity storage capacitors. The purpose of the invention is to improve the mass and size parameters by increasing the conversion frequency. The converter contains thyristors 1, 6, thyristors 2, 4 are connected in series between the terminals of the power source, and thyristors 3, 5 - in series between, the anode of the thyristor 6 and the cathode of thyristor 5. Between the connection points of the thyristors 2, 4 and 3, 5, respectively, the choke 7 is turned on and between the connection point of the thyristors 3, 5 and the middle output of the power source is a capacitor 8. The cathode thyristor 1 n of the anode of the thyristor 6 is connected to the middle output of the power source, respectively, through the primary windings of the inductive drives 9, 10. The secondary windings accumulate Telephones 9, 10 through rectifying diodes 11, 12 are connected to a storage capacitor 13. In the circuit there is a repetition of cycles of accumulation - a reset with a certain frequency. The next pumping of accumulator 9 begins at the moment of the fall to its zero discharge current. 3 il.

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The invention relates to converter equipment and is intended for charging high-capacity storage capacitors.

The purpose of the invention is to improve the overall dimensions by increasing the conversion frequency.

FIG. 1 shows a circuit diagram of the device; in fig. 2 - diagrams of currents and voltages, explaining his work; in fig. 3 is a diagram of the second modification of the device.

The device (Fig. 1) contains thyristors 1-6, the thyristor 1 being connected by an anode to the positive terminal of the power source, and the thyristor 6 by the cathode to the negative terminal of the power source, the thyristors 2, 4 are connected in series between the indicated terminals of the power source, and the thyristors 3, 5 - sequentially between the anode of the thyristor 6 and the cathode of the thyristor 5. Between the connection points of the thyristors 2, 4 and 3, 5, the choke 7 is connected and between the connection point of the thyristors 3, 5 and the zero output of the litany source - switching capacitor 8. Cathode Ristors 1 and anode thyristor b are connected to the middle output of the power source, respectively, through the primary windings of inductive drives 9, 10, the secondary windings of which are connected to storage capacitor 13 via rectifier diodes 11, 12. The thyristors are turned on by signals from control unit 14 connected by input pins with a capacitor 8.

The device works as follows.

In the initial state, the supply voltage is applied to the converter, thyristors 1-6 are closed, the current in the inductive accumulators 9, 10 is absent, and the voltage on the storage capacitor 13 is zero. The first accumulation of energy can start the drive 9

or accumulator 10. Suppose that the first two pulses simultaneously arrive at the control electrodes of thyristors 1 and 2, which open and the current grows along the circuit: + Un, thyristor 1, the primary winding of drive 9, O. Simultaneously, along the circuit: + Un, thyristor 2, inductance 7, capacitor 8, O, a rapid oscillatory charge of the switching capacitor 8 occurs up to twice the value of the supply voltage with the polarity shown in fig. 1 in brackets.

The accumulator 10 is put into operation with a certain constant time delay (Fig 2) with respect to the moment of switching on the accumulator 9. The minimum value of this delay is determined by the recharge time of the switching capacitor 8.

After a time interval t0, during which the current ig in the inductive drive 9 reaches a predetermined value, the switching thyristor 3 "turns on. The thyristor 1 is applied to the opposite voltage equal to the difference of the voltage of the capacitor 8 and the power source Uh, and it is locked. From the time tz, the commutation capacitor 8 recharges (Ug in Fig. 2) across the circuit: thyristor 3, the primary winding of accumulator 9, capacitor 8. At the time of zero voltage U8, a control pulse is applied to the thyristor 4, which opens, providing forirb recharge capacitor 8 to twice the value of the supply voltage (polarity shown in fig. without brackets) along the circuit: O, capacitor 8, choke 7, thyristor 4, - Uh, the discharge of the energy of the inductive storage device 9 to the capacitor 13 at the same time begins circuit: accumulator secondary element 9, capacitor 13, diode 11. The voltage on the capacitor 13 in this case increases by an amount determined by the dose of the transmitted energy. At time t, when the current i 10 in the accumulator 10 reaches a predetermined value, the thyristor 5 is turned on. In this case, the reverse voltage equal to the voltage difference between the switching capacitor 8 and the power supply is applied to the thyristor 6 and it is locked. On the circuit: Oh, the primary winding of the drive 10, the thyristor 5, the capacitor 8 is the reverse recharge of the switching capacitor. When the voltage U reaches the zero level, the thyristor 2 is turned on, which along the circuit: + Uh, thyristor 2, choke 7, capacitor 8, O performs a forced recharge of capacitor 8 to twice the value of the supply voltage with polarity. 2

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ABOUT

/ T 28

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Claims (1)

SUMMARY OF THE INVENTION A DC to DC converter containing a switching capacitor, two inductive 'drives, the secondary windings of which are connected in parallel with the storage capacitor through rectifier diodes, and thyristors are connected in series with the primary windings, the control electrodes of which are connected to the corresponding outputs of the control unit, which is that, in order to improve overall dimensions by increasing the conversion frequency, the first thyristor is connected and one to the positive input terminal, and the second cathode to the negative input terminal, and an inductor and four thyristors are additionally introduced, the first and second of 20 of which form a series circuit connected in the forward direction between the positive and negative input terminals, and the third and fourth also form - a sequential circuit connected counterclockwise to the input terminals and shunting the series-connected primary windings of inductive drives, the combined terminals of which are connected to zero input terminal, and a choke is connected between the connection points of the first and second and third and fourth additional thyristors, a switching capacitor is connected to one of the output terminals with a zero input terminal, and the other to the connection point of the third and fourth additional thyristors. 4g g π j * 3 t _s \ j i 1 If 1 FIG. 2 1 -Composer V. Polyakov