SU1422222A1 - Programmed pulsed stabilized voltage source with transformer-less input - Google Patents

Abstract

The invention relates to electrical engineering and can be used in power supply systems of various electronic equipment. The aim of the invention is to increase the stability of operation and the expansion of the control range while reducing the ripple of the output voltage. The device contains a single-ended transistor converter 5 with an output transformer, a diode 9, a smoothing DLC filter 10, a master oscillator 1, a control driver 2, an integrator 13 with a reset, a comparator 16, an error amplifier 17, the input of the integrator 13 through a capacitor 8 and The first diode 11 is connected to the first output of the secondary winding of the output transformer 7, the second output of which through the second diode 12 is connected to the junction point of the capacitor 8 and diode 11, a new implementation of parametric contour allowing t exclude the dependence of the voltage of the pulses at the input of the integrator a 13 on the duty cycle and compensate for the decrease in the stabilization factor while reducing the duty cycle, 3 sludge. W with

Description

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The invention relates to electrical engineering and can be used in power supply systems of various electronic equipment,

The aim of the invention is to increase the stability of operation and to expand the range of adjustment of the source of voltage, while the pulse decreases, due to a change in the power supply voltage.

. Fig. 1 shows a functional diagram of a programmed stabilizer; irovinogr voltage source with a transformator input | Fig. 2c; pulsed voltage cellar at the output of the SECONDARY winding of the transformer at Borehole x and Q 2; Fig. 3 shows plots of pulse voltages at the output of the atoric winding of a transformer.

According to the diagram (Fig. 1), the Voltage regulator comprises a master oscillator 1, a driver 2 for control pulses comprising trigger 3 and a power amplifier 4 with galvanic open, a single-contact transistor Voltage converter 5, imitating a switch on the transistor 6 and an output transformer 7, one of the conclusions of the secondary winding of which is connected to capacitor 8, a diode 9 transmitter, a DLC filter 10, a first diode 11, a second diode 12, an integrator 13 with a reset, including an RC circuit 14, a discharge transistor 15, a comparator 16, power 17 p coordination

Figure 2 and 3 shows the following charts:

) - voltage at the output of master oscillator 1} UjCt) - voltage at the secondary winding of the transformer 7; UijCt) —the output voltage of the detector 13, U, (t) —the voltage at the output of the comparator 16, UjCt) the voltage at the output of the trigger 3,

The device works as follows.

The pulses from the output of the master oscillator 1 are fed to the trigger input

Former 2 control pulses and at the same time a differentiating chain of integrator 13 with reset 13 (FIG. 3). In this case, the trigger 3 is set to a state with a high output logic level, which is amplified in power and through an electrical isolation circuit.

4power shaper 2 postzshaet to the input of the transistor 6 power one

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| about

5 d

0 5

five

five

clock converter 5. The transistor opens and at the output of the secondary winding of the pulse transformer 7, a positive pulse appears, which flows through the capacitor 8 and the diode 11 to the integrator 13 with a reset. The latter integrates until the voltage at its output becomes equal to the voltage at the output of the error amplifier 17. A high logic level appears at the output of the comparator 16, which flips the trigger 3 of the driver 2 to a state where logical O is present at its output. At the same time, the transistor turns off and a negative pulse appears at the output of the secondary winding of the transformer 7, which will charge the capacitor 8 through diode 12 to equal the amplitude of the negative part of the pulse. With the arrival of the second pulse from the master oscillator 1 to the input of the integrator 13, its key transistor 15 opens and the integrator 13 is reset. The trigger 3 of the driver 2 again assumes a state in which the transistor 6 of the converter 5 is open and a positive pulse is present at the output of the transformer 7, the value of which is added to the charge value of the capacitor 8, and therefore the integrator 13 receives a positive pulse, the amplitude of which equal to the sum of the amplitudes of the positive and negative parts of the pulses when changing their duty cycle.

In the steady-state mode, the voltage at the first input of the error amplifier 17 differs from the voltage supplied to its second input from an external programmable low-power voltage source by the magnitude of the static control error.

Thus, the proposed technical solution allows to expand the range of output voltage regulation and reduce the ripple voltage due to the final stabilization ratio and output voltage in case of accidental changes in the supply voltage of the mains voltage and in the presence of alternating voltage ripples that are multiple of the frequency network, as it eliminates the reduction of the stabilization factor of the parametric control channel while reducing the duty cycle Q of control pulses. From below this value is limited by the values, and from above it is determined by the switching time of the transistor

+ c

v1kl

where T is the period of control pulses;

 -

Vv1kl - constant on and off time.

Claims (1)

Formula and addiction " A programmed pulse stabilized voltage source with a transformer-free input, containing a single-cycle transistor voltage converter with an output transformer, the secondary winding of which is connected to the output terminals via a voltage converter and DLC filter, the control driver, which output is connected to the control input of the voltage converter, the error amplifier, the first input of which is connected to the output output, pulse-width pulse 2 A a modulator comprising a driver (a generator, a comparator, one of the inputs of which is connected to the output of the error amplifier, characterized in that, in order to increase operation stability and expand the control range while reducing pulsations due to a change in supply voltage, integrator with reset, capacitor, the first and second diodes, while the output of the master oscillator is connected to one of the shaper inputs the impulse control ratios and the control input of the integrator, the output of which is connected to the second input of the comparator, the output of the comparator is connected to the second input of the control driver, the first output of the secondary winding of the output transformer through the capacitor and the second diode connected to the second diode connected with the connection point of the capacitor and the first diode, the second input of the error amplifier is connected to the input terminal for connecting the programmed control signals. Ig na..e on the second hand of the coil of the trance format 7 Min FIG. 2 and i ig.Z