SU1669070A1 - Method for control of k-channel voltage converter - Google Patents

Abstract

The invention relates to electrical engineering and can be used to control K-channel voltage converters with load switching. The purpose of the invention is to increase reliability by eliminating emergency conditions in the converter cells associated with asymmetric remagnetization of power transformers. Change the phase of the control pulses N of the M inverted converter cells by 180 ° electrical degrees synchronously with the middle of the period of the clock pulses. 2 Il.

Description

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The invention relates to electrical engineering and can be used to control K-channel voltage converters with load switching.

The purpose of the invention is to increase reliability by eliminating emergency conditions in the converter cells associated with asymmetric remagnetization of power transformers.

Figure 1 shows the functional diagram of the device implementing the proposed method; 2 shows diagrams explaining the operation of the device.

The method of concluding that they form clock pulses, generate cell control pulses with a frequency two times lower than the frequency of clock pulses, to switch the load, form a permission signal for a single change in the phase of cell control pulses

180 el. for N of M inverted cells, and change their phase in synchronism with the middle of the clock period.

The device comprises a control pulse shaping unit 1, a clock generator 2 and a one-shot 3. Moreover, the clock generator 2 is connected to the clock inputs of the control pulse forming unit 1 and the one-vibration 3. The one-shot 3 output is connected to the switching input of the control pulse forming unit 1. The control input of the one-shot 3 is designed to provide a switching signal to it, which leads to the switching of the inverting inverted cells 4. The outputs of the control pulse-shaping unit 1 are designed to be connected to the inputs of the corresponding M inverted cells 4 and L non-inverted cells 5. Both

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cell types are appropriately connected to load 6.

On the timing diagram (figure 2) are shown: a - switching signal, b - clock generator pulses, c. d - control signals of the input (power) keys of the inverted converter cell 4, d - pulses at the input of the non-inverting converter cell 5, e is the switching characteristic of the load 6.

The operation of the device shown in FIG. 1, which implements the proposed (method, is carried out as follows.

Control pulses for all M + L cells are formed in control pulse shaping unit 1 and synchronized with clock generator 2. This unit generates signals and controls the input circuits of the converter cells (inverted 4 and non-inverted 5). The outputs of the Converter cells 4 and 5 are connected to block 6 of the K loads. The frequency of the conversion cells 4 and 5 in the normal mode is two times less than the frequency of the clock generator 2 and is determined by switching the triggers in block 1 along the leading (falling) edge of the clock pulses. If it is necessary to change the state of the load unit 6 on the address bus of the unit 1, the required address is set, and the one-shot 3 generates an Inversi signal. The single-oscillator 3 is brought to the active state by the next step of the operation of the 6 K load block, and returns to the initial state along the trailing (leading) edge of the clock pulses.

Along the trailing edge of the clock generator 2, the input voltage of the inverted converter cell 4 changes, which leads to the disconnection of one power switch and the inclusion of another power switch of the inverted converter cell 4. Accordingly, the polarity changes at the output of the converter cell 4, and load 6 is a voltage equal to the sum of the voltages taken from the converter cells 4 and 5. When the signal is removed, the switching operation of the power switches occurs in counter a phase with a primary pulse following at a frequency equal to half the frequency of the clock pulses of the master oscillator. On

load 6, the voltage remains applied (Fig. 2e). The master clock clock generator 2, through block 1, continues to control the input circuits of the converter cell 5 with an unchanged phase (Figure 2d). When the Switch command arrives again, the power switches again switch over the falling edge of the clock of the clock master oscillator 2

in phase with the primary following of pulses (figv, g). In this case, the opposite phase of the output cell of the converter cell 4 is changed and the voltage on the load 6 is zero. When the Switch command is removed, the output voltage does not change (Fig. 2a, c, d). The polarity of the output voltage from block 1 (point d in Fig. 2), as well as at the output of the converter cell 5, does not change in phase.

Thus, between the supply of two Inversi signals, the phase of the output pulses of one converter cell 4 is switched, which leads to the appearance of a pulse on the load 6, as

shown in the diagram at point e. When switching K loads, control over the Inversi signal occurs in N from M conversion cells, where N and M are the numbers of inverted cells. Number of inverted

The cells are determined by the address at the inputs of unit 1. At the same time, the proposed method makes it possible to increase the reliability of the voltage converter and to achieve complete symmetry of the magnetization reversal of the magnetic circuit of the power transformer.

Claims (1)

Claim Method Control K-channel voltage converter consisting of M Inverted and L non-inverted converter cells, consisting of forming clock pulses, generating cell control pulses with a frequency two times lower than the frequency of clock pulses, generating a resolution signal for a single phase change of cell control pulses by 180 electrical degrees for N of M inverted cells, characterized in that, in order to increase reliability, the phase change of the N control pulses from the M inverted converter cells is made synchronously with the middle of the clock pulse repetition period. Switching ABOUT at AND (Rig 1 P/ l P