SU1520636A1 - Reversing converter - Google Patents

Abstract

The invention relates to a converter technique and can be used to power the DC drives. The purpose of the invention is to improve the dynamic characteristics and expand the range of adjustment. The device contains a switch on the keys of direct current (QPT) 2-5. Additional KPT 19 - 22 are connected in series with the working windings 6-9. The cathode group KPT 13, 19 is connected via an additional diode 25 to the positive pole of the power source 11. In this case, the electromagnetic method of engine braking with the recovery of the electromechanical energy of the engine through saturation thrusts 10 to the power source 11 is implemented. 3 il.

Description

40

-ABOUT

with

The invention relates to a converter technique and can be used to supply DC electric drives,

The purpose of the invention is to improve the dynamic characteristics and expand the range of adjustment.

Figure 1 shows the reversing converter circuit; Fig. 2 is a functional diagram of the control unit of the reversing converter; FIG. 3 shows time diagrams of operation of controlled, DC switches of the converter,

The reversing converter (FIG. 1) contains a bridge switch 1 with direct current switches 2-5. The anode and cathode groups of these keys are combined and connected via working windings 6–9 saturation throttles (DN) 10 to the corresponding poles of power supply 11, Control windings 12 and 13 DN 10 are connected in series to control power source 14 via an IS choke. The diagonal of the alternating current of the bridge switch 1 includes the motor 16, On the rack of keys 2 and 3 of the bridge switch 1, the working windings 6 and 7 of one core 17 of DN 10 are switched on, and on the rack of keys A and 5 of the bridge switch 1 - working windings 8 and 9 of the secondcore 18 DN 10, Consecutively with each of the working windings 6-9, additional switches 19-22 of direct current are connected, respectively, forming the anode and cathode groups of the additional bridge. The cathode group of keys 20 and 21 is shunted by counter-parallel-connected diodes 23 and 24, and between the positive pole of the power source 11 and the cathode group of keys 3 and 5 of the bridge switch 1, an additional diode 25 of the cathode is connected to the positive pole of the power source 11 .

The control inputs of the keys 2–5 of the bridge switch 1 are connected via amplifiers 26 and 27 to a modulator 28 of duration, by an indicator 29 of the sign of the input signal of the control unit. The control inputs of the keys 19-22 of the additional bridge are connected via amplifiers 30 and 31 to a modulator 28 of duration, which is clocked by the master oscillator 32,

The device works as follows.

The keys 19 and 22 operate in opposite phase by a half-period (FIG. 3), the keys 20 and 21 are unlocked synchronously with the keys 22 and 19, respectively, and the duration of their switch-on state is determined by the duration of the switch 28 depending on the magnitude of the signal Ug. With one direction of rotation of the motor 16, an unlocking signal is supplied to the amplifier-driver 26 from the 29-character indicator of the input signal, and keys 2 and 5 of the bridge switch 1 are opened with a first pulse from the duration modulator 28, and the locking signal comes to the amplifier-driver 27 the keys 3 and 4 are locked with a delay TC determined by the electromagnetic constant motor. When the input signal changes its polarity, the unlocking signal goes to the amplifier-shaper 27, and the locking signal goes to the shaper-amplifier 26, while the keys 3 and 4 of the bridge switch-on switch 1 are opened, and the keys 2 and 5 are closed with a delay T , and there is a reverse engine,

When voltage is applied from power supply sources 11 and 14, keys 2 and 5 are open. The motor load current in one of the half periods flows through the circuit: plus power supply 1, key 19, working winding 6 of core 17, key 2, measles of engine 16, key 5, winding 8 of core 18, key 21, minus power supply 11. In this case, the core 17 tends to go out of place, and the core 18 is saturated, the moment of time specified by the angle of control, the key 21 is closed and a pause is formed in the output voltage of the converter. The inductance current of the motor flows through the circuit: measles of the engine 16, key 5, diode 25, key. 19, the working winding 6. of the core 17, the key 2, the measles of the engine 16 In the next half-period the load current flows through the circuit: plus the power source 11, the key 22, the working winding 9 of the core 8, the key 2, the measles of the engine. 16, the key 5, the winding 7 of the core 17, the key 20, minus the descaler of the nickname II. At the same time, the core 18 tends to get out of saturation and the core 17 is pressed, At the time specified by the angle of control, the key

20. In the pause, the motor inductance current flows through the circuit: measles of engine 16, key 5, diode 25, key 22, working winding 9 of core 18, key 2, engine measles 16,

It is known from DN operation in the forced magnetizing mode that the maximum operating current of the DN and the successive operating current, and hence the maximum current of the core, and the load are determined

by

where is 1,

Ipwp

one.

H Wp, W

tel. Developed braking torque; The motor will be maximal and constant until the motor is completely stopped. The electromechanical energy of the motor, partially dissipated on the active resistance of the core winding and reflected 10 coils of the magnetic amplifier, is alternately stored in the DN cores and reduced to source 11 of the power supply.

Thus, the proposed structure of the converter allows, due to the amplitude limitation of the current, to start the motor at the maximum duty cycle of the output voltage pulses, which excludes

-current flowing through the working windings NAM;

- DN control current;

- the number of turns of the working and control windings.

Operating current NAM set equal to the maximum current of the engine. Therefore, in 20 jerky currents and improves the dynamics of the nominal mode of operation of the engine acceleration, when braking ensures both cores of the bottoms are in a saturated state and the bottoms do not affect the operation of the engine. As a result, there are no losses at the restrictive level of the reverse, the cop are absent. When starting, braking and overloading the motor, the load current is limited by the operating current of the DN

and, the flow through the working windings of the Reversing Converter, containing 6 and 9 cores 17 and 18, creates a magnetic flux 30 directed bridge switches on the keys, meeting the maximum and constant braking torque to a full stop, and in the aggregate improves the dynamics of the formula

DC, anodic and cathodic groups of which are combined and connected to the working I windings of saturation throttles, the control inputs of these keys 25 are connected via amplifiers-formers to the input signal indicator and the duration modulator. clocked from the master oscillator, the operating current of the DD, The heart-controlled windings of the throttles of the nick 17 and 18 alternately in the working 40 are intended to be connected 1–1 luperiod store their electromagnetic supply to the control power source, and the diagonal of the alternating current is bridge the switch is connected to the output of the motor body connecting dp 45, characterized in that, with the aim of improving the dynamic characteristics and expanding the range of control by using the properties of the amplitude current, the winding 8 , diode 25, source AND, diode 50 of saturation droplets, magnetic circuit 24, winding 8, also donates saturation reserve of saturation made in the form of an energy in non-two cores in the working half-period. with two working points 11. windings each, one of which

When the engine is reversed, the first electromagnetic method of braking is implemented in the anodic one and 55 in the cathodic circuit of the bridge engine. the neural choke is also summed; in series with the motor core current, it is equal to the maximum of each working winding of the throttle saturated with the magnetic flux created by the windings 12 and 13 of the control. This leads to an increase in the inductive resistance of the DN 10, and the supply voltage of the 1I source is redistributed between the DN and the motor so that the load current is equal to

energy, Into the controlling half-period core 17, turning over the circuit; winding 7, diode 25, power supply 11, diode 23, winding 7, transfers the energy stored in the working half-period to power supply 11. Similarly, the core 18 in its control half-period, reversal of the circuit:

to the nominal operating current, and consequently, to the maximum current of the core 15

jerky currents and improves the dynamics of acceleration, while braking provides a push-reverse,

with maximum and constant braking torque to a full stop, and in the aggregate, the dynamics of continuous currents are improved and the dynamics of acceleration are improved; while braking, the reverse pressure is maintained;

Claims (1)

Invention Formula This includes additional DC switches that form the anode and cathode groups of the additional BRIDGE} connected to the terminals for connection to the poles of the power source, the keys of the cathode group of which are bridged by oppositely connected input diodes, the control inputs of the keys the cut-formers are connected to a duration modulator, and an additional diode is connected to the cathode group of the bridge switch by an anode, the cathode of which is connected to the input terminal for connecting it to the positive pole of the power source,