CS257807B1 - Connecting the control part of the transistor converter - Google Patents

Abstract

The connection of the control part of the transistor converter ensures reliable generation of control pulses using a simple reference signal generator without any requirements for special parameters of the components used and settings, prevents by simple means the unwanted generation of multiple control pulses during the duration of one reference signal period and the generation of pulses for both converter branches simultaneously, ensures the minimum duration of the generated pulses according to the requirements resulting from the design of the power part of the converter. The control part of the transistor converter is intended for use in converters for regulating DC electric motors.

Description

257807 2

BACKGROUND OF THE INVENTION The invention relates to the connection of a control part of a transistor converter.

So far known analogue wiring solves the generation of control pulses for individual branches of the converter by comparing the output voltage and the reference signal of the triple-solenoid. Saw shape, the switching circuit of the converter and the associated switching logic determine the auxiliary circuits. The amplitude and the unidirectional component of the reference signal affect the shape of the control pulses, so they need to be precisely adjusted. Typically, the wiring misses the blocking of multiple pulses during one reference signal period and also provides a minimum control pulse duration.

The above mentioned drawbacks are eliminated by the connection of the control part according to the invention, which is that the output of the triple generator signal is connected to the input of the inverter and simultaneously to the first input of the second comparator, the output of the inverter is connected to the first input comparator, while the output of the controller is connected to the second inputs of the comparator. The output of the first comparator is connected to the first input of the summing member and simultaneously via the first protection resistor to the first input of the locking member and to the input of the first monostable flip-flop. The output of the second comparator is connected to the second input of the summator member and at the same time a second protective resistor is provided to the second input of the locking member and to the input of the second monostable tip. The output of the first monostable flip-flop is connected via a first separation diode to the first output of the locking member. The output of the second monostable flip-flop is coupled to a second separation diode with a second output of the locking member. The outputs of the blocking element simultaneously outputs the control part of the transistor converter. The output of the summing member is connected to the input of the bistable flip-flop whose input is connected to the auxiliary output of the triangular signal generator. The output of the bistable flip-flop is connected to the control input of the locking member. In the triangular signal generator, which is formed by the integrator and the operational amplifier of the function of the comparator with the hysteresis, the non-inverting input of the operational amplifier is coupled to the anode of the Zener diodes connected in series. The cathode of the first Zener diode is connected to the zero potential of the power supply and the cathode of the second Zener diode through the third protective resistor connected to the output of the operational amplifier. Inverting the input op-amp is connected via a resistor to the positive terminal of the power supply, and a diode anode, whose cathode is coupled to the power supply zero potential, is connected.

The connection of the control part of the transistor converter according to the invention is based on the reference signals used for the individual branches of the converter. The base reference signal is generated by a generator whose circuit connection provides, without adjusting elements, a single signal reference signal. The control part of the converter, supplemented with flip-flops and locking circuits to ensure reliable generation of control pulses of the desired shape, and sequentially eliminates the possibility of switching the two branches of the converter on and off at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a particular embodiment of a control portion according to the invention, wherein FIG. 1 shows the overall control portion and FIG. 2 shows a reference signal generator with opposite signal polarity. The output of the trolley signal generator 2 and the output of the inverter 2 are connected to the first inputs of the comparators 3 and 4, on which the second inputs of the converter are connected to the output of the controller 14. The outputs of the comparators 3 and 4 are connected to the inputs of the summing member 12 and simultaneously through the protective resistors 5 and 6 to the inputs The outputs of the monostable flip-flops 2 and 5 are connected via the diodes 9 and 10 to the outputs of the locking member 11, which at the same time form the outputs of the converter control part. The output of the sucking member 12 is connected to a first input of a bistable flip-flop 13, the second output of which is connected to the auxiliary output of the triple signal generator 2. The output of the bistable flip-flop 13 is connected to the control input of the locking member. 3 257807 In the triangular pulse generator 1-fig. X is the non-inverting input of the operational amplifier 16 connected via a resistor 20 to the common anodes of the Zener diodes 18 and 19, the inverting input of the operational amplifier 16 is connected to the anode of the diode 21 and simultaneously the resistor 22 of the power supply terminal. The output of the operational amplifier 16 is via a protective resistor 17 connected to the cathode of the Zener diode 18. The cathodes of the Zener diode 19 and the diode 21 are connected to the zero potential of the power supply. In the triangular pulse generator 2 of Fig. 2, the non-inverting input of the operational amplifier 16 is connected via a resistor 20 to the common cathodes of the Zener diodes 18 and 19, the inverting input operative amplifier 16 is connected to the cathode of the diode 21 and simultaneously via a resistor 22 to the negative terminal of the power supply. The output of the operational amplifier 16 is via a protective resistor 17 connected to the anode of the Zener diode 18. The anodes of the Zener diode 19 and the diodes 21 are connected to the zero potential of the power supply.

At the outputs of the comparators 2 and A, after comparing the output voltage of the regulator and the reference signal, pulses of rectangular shape, which, with their leading edges, trigger monostable flip-flops 1 and θ are generated. determining the minimum duration of the excitation pulse. The output pulse member 12 flips the bistable flip-flop 13 with its downward edges, which actuates the locking member 11 with its output. The leading edge of the pulse from the auxiliary output of the triangular signal generator 2 flips the bistable flip-flop 13 into the initial state at the beginning of each reference signal period. The locking member 11 in the inactive state allows the signal to be transmitted from its inputs to the outputs.

On each of the outputs of the drive control part, there is a logical sum of the signals from the comparator and the monostable flip-flop of the respective inverter branch. In each reference signal period, after generating a single pulse in comparator 2 or 2, the blocking member 11 is provided with an active state in which it blocks the transmission of pulses from the inputs to the outputs as well as the triggering of the stable and stable Z and J-L circuit ends. In the triangular generator 2 of Fig. 1 formed by the integrator 15 and the operational amplifier 16 as a comparator with hysteresis, with positive voltage at the output of the operational amplifier 17, its tilting is determined by the voltage on the diode 21 in the forward direction and voltage on the Zener diode 19 also in forward direction. Since these voltages are the same, the operational amplifier 16 is tilted at the same voltage value at the output of the integrator 15, regardless of the set triangle amplitude. 2 ° Br. 1 is a positive polarity signal with a constant low signal voltage level.

Since the negative polarity reference signal is formed by inverting the positive polarity signal in the inverter 2, pulses cannot be generated simultaneously at the outputs of the comparators 2 and A. The operation of the generator of the analog signal 2 of FIG. 2 is identical to that of the generator of FIG. the Zener diodes 18, 19 and the diode 21 are polarized, the output is a negative polarity signal with a constant upper signal voltage level.

Another way of circuitry the control part of the transistor converter while maintaining the ground function is to connect the outputs of the comparators directly without the protective resistors to the input blocking member, the outputs of the blocking member being connected to the inputs of the monostable flip-flops and simultaneously to the first inputs of the summing members and the second inputs of the summing members are connected to the outputs monostable flip-flops without isolation diodes. The summation member outputs are simultaneously outputs of the drive control part.

Claims (2)

257807 4 SUBJECT OF THE INVENTION Connection of a transistor converter control part characterized in that the output of the triangular signal generator (I) is connected to the input of the inverter (2) and simultaneously to the first input of the second comparator (4), the output of the inverter (2) is connected to the first input of the first comparator (3), whereby the output of the controller (14) is connected to the second inputs of the comparators (3, 4), the output of the first comparator (3) is connected to the first input of the summing member (12) and simultaneously via the first coil resistor (5) to the first input of the locking member (11) and to the input of the first monostable hinge circuit (7), the output of the second comparator (4) is connected to the second input of the summation member (12) and simultaneously via the second protective resistor (6) to the second input of the locking member (11) and to the input of the second monostable the flip-flop (8), the output of the first monostable flip-flop (7) is connected via the first decoupling diode (9) to the first output of the locking member (II), output the The monostable flip-flop (8) is connected via a separation diode (10) with a second output of the locking member (11), the outputs of the locking member (11) being simultaneously outputs of the control part of the transistor converter, the output of the summing member (12) being connected to the first the input of the bistable flip-flop (13), the second input of which is connected to the auxiliary output of the triangular signal generator (1) and the output of the bistable flip-flop (13) is connected to the control input of the locking member (11). 2. Connection of a control part of a transistor converter according to claim 1, characterized in that a non-inverting input of the operational amplifier (16) is present in the triangular signal generator (1) formed by the integrator (15) and the operational amplifier (16) as a comparator with hysteresis. ) connected via a resistor (20) to the anodes of the zener diodes (18, 19) connected in series, wherein the cathode of the first Zener diode (19) is connected to the zero potential of the power supply and the cathode of the second Zener diode (18) is via the third protective resistor (17) ) connected to the output of the operational amplifier (16), the inverting input of the operational amplifier (16) is connected to the diode diode (21) and at the same time via the resistor (22) to the positive terminal of the power supply, wherein the cathodadiode (21) is connected to the zero potential of the power supply. 2 drawings