SU1467695A1 - D.c. to d.c. voltage converter - Google Patents

Abstract

The invention relates to converter technology and can be used to charge high-capacity storage capacitors. The aim of the invention is to reduce the weight and size of the converter. The device contains w 7.1-7.t inductive drives with series-connected 1.1-1.t power thyristors. The switching circuit is made in the form of t / 2 + 1 chains of 2,3, 4.1-4. T series-connected thyristors, switching capacitor 6 and throttles 5. The next inductive storage device 7.1-7.t is put into operation with a certain shift in time relative to the previous one, the minimum value of which is determined by the time of recharging capacitor 6. 2 Il. (L

Description

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The invention relates to converter technology and can be used to charge high-capacity storage capacitors.

The aim of the invention is to reduce the weight and size of the converter.

FIG. 1 is a schematic diagram of a t-stroke charge converter; in fig. 2 - schematic diagram of the converter at.

Voltage converter contains 1.1-1.t thyristor thyristor m, the first chain of additional thyristors 2 and 3, t / 2 chains consisting of 4.1-4.t switching thyristors, a charging choke 5, a switching capacitor 6, hectares of inductive drives 7 ., m step-by-step diodes 8.1-8. t, load 9, for example, a storage capacitor and a control unit 10 (Fig. 2).

The principle of operation of the t-cycle voltage converter should be considered on the example of a converter with. In the initial state, the supply voltage is applied to the circuit, the thyristors 1.1 and 1.2 are closed, the current in inductive accumulators 7.1 and 7.2 is absent, and the voltage on the switching 6 and accumulative 9 capacitors is zero. At the first moment of time, the control pulses are applied to thyristors 1.1 and 3, which are opened and the charge of the inductive accumulator 7.1 starts along the circuit: + source, accumulator 7.1, thyristor 1.1, O source. At the same time, the source O, the capacitor 6, the choke 5, the thyristor 3, the source is forced to charge the switching capacitor 6 to twice the supply voltage with the polarity shown in FIG. 2 in brackets, after which the thyristor 3 is locked.

i It should be noted that the next inductive storage device is put into operation with a certain shift in time relative to the previous one, the minimum value of which is determined by the recharge time of the switching capacitor, and the maximum value is, in principle, not limited. Moreover, the charge of the accumulators included in the circuits of positive and negative supply voltages (Fig. 1) is alternated.

for example, in the following sequence: .7.1, 7.4,7.2, 7.5, etc. For the purpose of uniform power consumption from the network, the magnitude of the time shift Lt should be equal to t (t3 + tp) / / m, where tj, tp are the charge and discharge times of the first inductive storage device, respectively.

0 After a certain time interval relative to the moment of turning on the thyristor 1.1 in FIG. 2, a control pulse is applied to the thyristor 1.2, which is turned on, and begins for the 5th row of accumulator 7.4 along the circuit: About source, thyristor 1.2, accumulator 7.4, - source. At the point in time when the current in the inductive storage device 7.1 reaches the specified value,

0 includes switching thyristor 4.1. The voltage of the capacitor 6 is applied to the thyristor 1 and, it is locked, opening the charging circuit of the accumulator 7.1. On the circuit: + source, coil 7.1, thyristor 4.1, capacitor 6, On the source, recharging of the switching capacitor 6 begins. When the voltage on it reaches zero, the thyristor 2 turns on

0 which along the circuit: + source, thyristor 2, choke 5, capacitor 6, O of the source performs a forced recharge of the switching con- stant. the sensor to double the value of the supply voltage with the polarity shown in fig. 2 without brackets. At the same time, the discharge of accumulator 7.1 starts at load 9 along the circuit: drive 7.1, capacitor 9, diode 8.1. The control pulses are formed and their output to the power thyristors at the appropriate times is carried out by the control unit 10, to the input of which the voltage of the switching capacitor 6 is applied.

Shown in FIG. 2 polarity (without brackets) of the voltage of the switching capacitor is suitable for switching the thyristor 1.2. When the current in drive 7.4 reaches the specified value, the thyristor 4.2 is turned on. The voltage of the capacitor 6 is applied to the thyristor 1.2 and it is locked, opening the storage circuit of the accumulator 7.4. According to the circuit: About the source, capacitor 6, thyristor 4.2, drive 7.4, - the source begins to reverse the recharge of the capacitor 6. If the voltage on it is zero, it turns on

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Claims (1)

Claim. DC / DC Converter, containing TP inductive drives, where m is even 8.1 is connected to the positive and the cathode to the negative input terminals, and each of the remaining w / 2 chains of additional thyristors, the midpoints of which are interconnected and connected through the switching capacitor to the zero input terminal, and through the choke to the midpoint of the first additional circuit thyristors, connected in parallel to the corresponding pair of series-connected power thyristors, the midpoints of which are connected to the zero input terminal. FIG. 2