SU433607A1 - CONVERTER WITH PARAMETRIC CONTROL OUTPUT HAnpfiJiEHilR - Google Patents

Description

The invention relates to the field of converter technology and can be used for secondary power supply sources. Transistor converters with parametric stabilization of the output voltage using the time of the master saturating transformer usually use a separate master oscillator of a stable frequency, which complicates the device.

For simplicity, it is proposed to include a diode voltage suppressor supplied by the secondary winding of a master transformer, the primary winding of which is connected to the converter smoothing filter via the reference voltage element, in a common basic transistor circuit of the converter auto-oscillator.

In addition, it is proposed to improve the stability of the output voltage of the proposed device when the load changes for which the primary circuit

the specified transformer included auxiliary winding droplet a smoothing filter.

FIG. I is a diagram of the proposed device; in fig. 2 - time diagrams of voltages.

In the diagram (see Fig. -1), a 1-stroke auto-generator; 2 supertiter; 3 - load; 4 output transformer; 5 and 6 left and right primary half windings of the output transformer; 7 and 8 - autogenerator transistors; 9 - feedback winding of the autogenerator; 10 - limiting resistor; M - diode limiter; 12 - time setting transformer; 13 - secondary winding time of the setting transformer; 14 - auxiliary winding of the throttle of the smoothing filter.

FIG. 2: a - voltage diagram on the windings of a switching transformer; b and c - voltage diagrams at transitions

collector - emitt-er transistors 7 and 8, respectively; g - H.anpFizhiye on load.

The device contains a push-pull auto-generator I with transformer feedback rectifier 2 and load 3 (with a smoothing 1C filter), one arm of the oscillator -i includes the primary semi-winding 5 of the power transformer f and transistor 7, the other is the primary semi-winding 6 and in series with The transistor 8 is turned on. Between the bases of the transistors 7,8 there is a feedback winding 9. In the combined part of the base transistors between the intermediate feedback winding and the combined emitters of the transistors are black a limiting resistor 10 of the output diode limiter included I-I. At the input of the limiter, the secondary winding 13 of transformer 12 is turned on, the primary winding of which is through the control (reference) voltage element EJ. connected to the smoothing

(RILTER,

Thus, the device has a double, semi-conductive inductive feedback: through a power transformer 9 and through a switching transformer 12 and a diode limiter Me. As a result, a four-step autogenerator mode of operation is implemented in the circuit.

At the first stage, for example, the transistor 7 is open. The transistor 8 is closed, the primary winding 5 is connected to the power supply source E, which is transformed into the secondary winding and the winding 9. The polarity of the voltage on the circuit 9 for the transistor 7 is open, for the transistor 8 closing. Under the action of the voltage on the secondary windings, one of the shoulders of the rectifier 2 is open and a voltage Ejj, |, is applied to the primary winding of the transformer 12. Polarity of voltage

The secondary winding of the transformer 12 is such that the current flowing through the circuit: the secondary winding 13 of the transformer 12, the resistor and the il limiter diode, keeps the limiter diode in the open state and the base emitter transitions of transistors 7.8 through the resistor 10 and winding 9 receive the polarity. Because

the voltage on the winding 9 is greater than the voltage on the open junction of the limiter II, then the total voltage in the base circuit of the transistor 8 has a closing polarity and therefore this transistor is maintained in the closed state.

The end of the first stage occurs when transformer 12 is saturated. At this time, the voltage on its secondary winding changes abruptly in magnitude and direction, limiter diode II closes, and the base circuit of transistor 7 breaks. At this moment, the throttle load current 3 begins to flow through the diode at the input of the smoothing filter and occurs at the moment of shutdown winding 5 emf will be applied through the other straightener shoulder to the low resistance of the diode installed at the input of the smoothing filter. Therefore, the energy stored in the magnetic field of the transformer 4 will be slowly discharged through its secondary winding, so that this process is not completed during the second cycle. All this time, the voltage on the windings of the transformer 12 will have a reverse polarity than in the first stage the AND limiter diode will be closed, and the voltage on the winding 13 will be applied through a resistor

10, the resistor limiter and 9 to the base-to-emitter transitions of the transistors in the closing polarity. Transistors 7.8 will be steadily closed.

The end of the second stage occurs when the transformer 12 is saturated in the opposite direction than in the first stage. At the same time, the voltage and polarity on its windings change again abruptly and become the same as in the first stage. The diode il of the delimiter opens again and a path is created for the current to flow in the base circuit of the transistor 8, since an emf is induced on the winding 9 of the trazistor 7. reverse polarity with respect to the first stage. Then the processes are repeated.

By biasing the winding 13 of the switching transformer 12 by an output voltage mismatch signal., It is possible to change the saturation time of it in the forward direction relative to the time of its magnetisation in the reverse direction and adjust the voltage to the load. When EQJJ is chosen to be stable (e.g. by turning on a zener diode), the output voltage will also remain stable. The inclusion in the primary winding circuit of the transformer 12 of the auxiliary winding 14 of the throttles allows one to disconnect the throttle and improve the accuracy of maintaining the voltage on the storage capacitor at the voltage level of the supporting element when changing the load. The subject matter of the invention is I. A paramarically controlled output voltage converter containing a push-pull key autogenerator on transistors with an output transformer, an output rectifier smoothing CS3. a filter and a circuit consisting of a primary winding, a time specifying the saturating transformer and a voltage element, characterized in that, for the purpose of simplification, the output of the voltage limiter is connected to the common circuit of transistor bases of the autogenerator; This circuit is connected to the output of the converter. 2. The converter according to clause I, which is i and i with the fact that the specified circuit is included at the input of the smoothing filter. 3. An inverter of n.-I, characterized in that, in order to increase the stability of the output voltage when the load current varies, this circuit is connected through an additional winding of the throttle of the smoothing filter to the output of this filter.

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