SU875361A1 - Pulsed stabilizer - Google Patents

Description

(54) PULSE STABILIZER

one

The invention relates to electrical engineering H can be used in secondary sources of power supply of radio devices.

Known DC voltage regulators containing an adjustable transistor operating in a key mode and an input connected to an isochrotism-modulated modulator, a filter consisting of a capacitor, a diode, and an additional transistor connected to it through a straightener, have an additional transistor active resistance, and an additional control unit, the output of which is connected to the input of the additional transistor | sistor 1 and 2.

The disadvantage of these impulse stabilizers is the complexity of the control system and the low efficiency, which is caused by the dissipation of excess energy in the additional transistor.

The closest in technical essence to the present invention is a pulse voltage stabilizer containing a regulating transistor, an LCD filter, an auxiliary transistor connected through 1 diode parallel to the LCD filter choke, a control pulse width modulator and a relay element, connected to output terminals the conclusions of the stabilizer 3.

A disadvantage of the known device is low efficiency, which is associated with the use of an active-mode transistor as a shunt element, i.e. the improvement of the stabilizer's danamic properties is achieved by dissipating the excess energy accumulated by the choke in the bypass element.

The purpose of the invention is to increase the efficiency of the stabilizer.

"five

Claims (3)

The goal is achieved by introducing an AND and OR NOT circuit into the voltage regulator, the output of the regulating transistor connected to the output of the AND circuit, the input of the additional transistor connected to the output of the OR-NOT circuit, and the inputs of these circuits are connected to the outputs of the modulator pulse width and relay element. In addition, an additional transistor is connected to the tap of the choke of the LCD-filter and to the additional winding of the choke of the LCD filter. FIG. 1 schematically shows the proposed device; in fig. 2 - timing diagrams explaining the principle of its operation. The pulse stabilizer contains a regulating transistor 1, an LCD filter consisting of diode 2, droplets 3 and a capacitor 4 connected to the output of the filter load 5, an additional transistor 6 connected through diode 7 parallel to the filter choke. The inputs of the regulating and additional transistors are connected, respectively, to the outputs of the circuits AND 8 and OR-NOT 9, the inputs of which, in turn, are connected to the outputs of the pulse width modulator 10 and the relay element 11. The inputs of the pulse width modulator and the relay element are connected to the stabilizer. Principle of operation: Stability: | Ator is illustrated by the timing diagrams in FIG. 2. Until that time, t t. The output potential of the relay terminal 11 is high, therefore the control pulses produced by the modulator of the pulse width 10 are passed to the input of the control transistor 1 through the circuit 8, and the transistor 6 is closed. The diode 7 excludes the supply of reverse voltage to the transistor 6 in the time intervals corresponding to the open state of the transistor 1. At the time t t. a jump-like increase in the load resistance 5 occurs, as a result of this the input voltage, the stabilizer will also increase at the time t tj. It reaches a value equal to the upper threshold of the relay element 11. At the output of this element, a low potential is established, c. as a result, transistor 1 is closed, and logically inverted control pulses are output to the input of transistor 6, produced by pulse width modulator 10. During the time period ty at which the throttle current 3 is greater than the load current, the voltage stabilizes by switching the transistor 6. The smaller the current in the filter choke, the more the relative duration of the closed state of the transistor 6. At time intervals when the transistor 6 is closed, the dross current flows through the load and decreases. In the time intervals when the transistor 6 is open and saturated, a current with small losses circulates in the circuit formed by the choke 3, the transistor 6 and the diode 7. At some instant of time t t – j the current is throttle. The village is reduced to zero, the voltage on the load is reduced to a value equal to the lower threshold of operation of the relay element 11 and the stabilizer returns to its original state. Thus, in the proposed device, the magnitude of the output voltage surge at c6pocje load does not exceed the threshold for triggering the relay element, which is limited from below only by the output voltage ripple, but unlike the well-known, the quality improvement of the output voltage occurs not at the expense of efficiency, since the transistor 6 operates in the key mode and practically all the energy accumulated in the choke is transferred to the load 5. Along with the main task, the task of expanding the range of the load current of one hundred ilizatora down to idling. In the low load modes, due to the rise of the stabilizer load characteristic, the relay element trips and the stabilizer disconnects from the primary source, which causes a decrease in the voltage on the stabilizer load and a new switching element of the relay element. Thus, the stabilizer starts operating in a combined relay-pulse-width mode and, in contrast to the known, operating in continuous mode, has in this case a higher efficiency. These objectives can also be achieved by connecting an additional transistor to the additional winding of the throttle filter. 1. An impulse stabilizer containing a regulating transistor, an LCD filter, an additional transistor connected through a diode in parallel to an LCD filter choke, a control pulse width modulator and a relay element, the inputs connected to the output pins of the stabilizer, differing in that higher efficiency, entered into the scheme AND and OR-NOT, with the input of the regulating transistor connected to the output of the circuit AND, the input of the additional transistor connected to the output of the circuit, and the inputs of these circuits are connected to the output am tsshrish pulse modulator and relay zlementy. 2. The stabilizer according to claim 1, wherein the additional transistor is connected to the LCD-fnlt droplet tap. 3. The stabilizer according to claim 1, characterized in that the additional transistor is connected to the additional winding of the LCD choke reset. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 277073 Cl. H 02 M 1/08, 1968. 8753616 2. USSR author's certificate N 408292, yut. G 05 F 1/56, 1971. 3. Authors' USSR fT 491936, cl. G 05 F 1/56, 1972, tftt Fig1