CS208246B1 - Connection of continuous voltage stabilizer with Saxon and voltage-dependent fuse - Google Patents

Abstract

Connection of a continuous voltage stabilizer with a time- and voltage-dependent current fuse. The connection according to the invention can be achieved by limiting the current temporarily to a higher current first and after a certain adjustable time permanently to a lower current, which is already dependent on the limited voltage due to heat loss on the regulating transistors. This effect is achieved with minimal means, which is an advantage over the previous state of the art. The connection of the continuous stabilizer described in the subject of the invention is suitable wherever appliances with a higher starting current are connected to the stabilized voltage, for example DC motors.

Description

(54) Continuous voltage stabilizer wiring with Sax and voltage-dependent fuse

Connection of continuous voltage stabilizer with time and voltage dependent current fuse. With the circuit according to the invention, it is possible to achieve a limitation first temporarily to a high current and after a certain adjustable time permanently to a lower current which is already dependent on a limited voltage due to heat loss on the regulating transistors. This effect is achieved by minimal means, which is an advantage over the prior art. The continuous stabilizer circuit described in the present invention is suitable wherever appliances with higher starting current, such as DC motors, are connected to the stabilized voltage.

Fig.1

US

Fig.2

208 246

The invention relates to the connection of a continuous voltage stabilizer with a time-dependent and voltage-dependent fuse.

In the known continuous voltage stabilizers, the operation of the current fuse is derived from the shunt voltage which opens the transistor, reducing the stabilized voltage.

To the shunt voltage is added the signal from the stabilized voltage and from the constant auxiliary voltage, for which it is necessary to use a separate power supply with at least two stabilized voltages. The fuse operates with only one current so that it does not allow even temporarily higher short-circuit currents, such as necessary for starting the motor.

These disadvantages are overcome by the connection of a continuous voltage stabilizer with a time and voltage-dependent current fuse according to the invention, in which the base of the auxiliary transistor is connected both via a second auxiliary resistor to ground and through a series combination of second resistor, first resistor, first shunt and second shunt with auxiliary emitter. transistor and a common terminal of the first and second resistors is connected via the first auxiliary resistor to the auxiliary terminal of the circuit. SUMMARY OF THE INVENTION The invention is based on the fact that the output terminal of the integrated circuit is connected to the common terminal of the first shunt and the first resistor and the input terminal of the flip-flop. The flip-flop output terminal is coupled via a series of charge capacitors and charge resistor to the cathode of the diode at the base of the shorting transistor whose collector is coupled to the base of the first auxiliary transistor. The collector of the first auxiliary transistor is coupled to the ground through the stabilizing capacitor and to the IC lowering terminal, and to the collector of the second auxiliary transistor, the base of which is connected via a third resistor to the common terminal of the first shunt and second shunt. with a first auxiliary transistor emitter with a shorting transistor emitter, a diode anode, a flip-flop, and a wiring output terminal.

By connecting a continuous voltage stabilizer with a time and voltage-dependent current fuse according to the invention, it is possible first to temporarily limit to a higher current, regardless of the limited voltage, and after a certain adjustable period of time regulating transistors dependent on limited voltage. This effect is achieved by minimal means, which is an advantage over the prior art.

1 is a circuit diagram and FIG. 2 shows the stress characteristic of FIG. 1.

In Fig. 1, the continuous voltage stabilizer circuit is formed by an integrated stabilizer circuit 4 with power to the first and second power terminals 7, 8 from the input voltage terminal JL of the unstabilized voltage supply source U _(] and output at the input terminal 6 of the stabilizer integrated circuit 4. The stabilizer integrated circuit 4 is grounded and a stabilizing capacitor 3 is connected to the stabilizing voltage stabilization voltage reduction terminal U _s 9. The output current I is from the stabilizer integrated circuit output terminal 6 via the first and second shunts 10, 11 to the continuous stabilizer output terminal 26. to which the individual load resistors 27 are connected. The drop on the second shunt 11 is converted to current by the third resistor 18 and opens the second auxiliary transistor 17 of the current fuse, reducing the regulated stabilized voltage U _with the broken line in FIG. currents. The loss of the sum of the first and second shunts 10, 11 is passed through the first and second resistors 12, 14 based on the first auxiliary transistor 16, which opens when the smaller of the monitored voltage stabilizer currents is reached as shown in solid line in FIG. The auxiliary current derived from the first auxiliary resistor 13 flows from the auxiliary voltage P _{p through the} auxiliary terminal 2, generating a voltage drop, co-opening the first auxiliary transistor 16 of the fuse. Similarly, the current derived through the second auxiliary resistor 15 flows from the stabilized voltage Π through the second resistor 14. the voltage drop again closes the first auxiliary transistor 16. This effect has disappeared at ground on the output terminal 26 of the continuous stabilizer from the outside of the stabilizer, while the loss on the first resistor 12 increases. This results in a less monitored current for zero voltage, adjustable by the first auxiliary resistor 13. The elbow of the current characteristic can be adjusted separately by the size of the second

208 246 of the auxiliary resistor 15. Next, the drop on the first and second shunts 10, 11 is fed to the input terminal 22 of the flip-flop 21, the output terminal 23 of which is routed through the RC RC charging capacitor 24 and charging resistor 25 based on shorting transistor 19. its collector and emitter short-circuit the base-emitter path of the first current fuse 16. A short-circuit diode 20 is disposed parallel to the base-emitter of the short-circuit transistor 19.

The function of the circuit according to the invention is as follows:

The integrated circuit of the stabilizer 4 maintains a constant stabilized voltage U on the output terminal 6 if the current drawn nepř does not exceed the smaller of the monitored values. Once tot occurs opens loss on pevním and second shunt 10, 11 of the first auxiliary transistor 16 and starts decreasing the lowering terminal 9 via the stabilized voltage U _g. At the same time, the flip-flop 21 is turned over and the shorting transistor 19 is temporarily opened via the RC member of the charging capacitor 24 and the charging resistor 25, whereby the influence of the first auxiliary transistor 16 is blocked again for a defined time. When the charging capacitors 24 are charged, the short-circuiting; The transistor 19 closes again and the stabilized voltage begins to decrease. In this case, the drop on the second resistor 14 decreases and the drop to. This helps to open the first auxiliary transistor 16 of the current fuse and thus causes the characteristic shown by the solid line in Fig. 2, which has a small short-circuit current I at a low output voltage U _o. In the second shunt 11, the second auxiliary transistor 17 opens via the third resistor 18 and the monitored current is limited as shown by the dashed characteristic in FIG. Here again, the flip-flop 21 acts and blocks the first current fuse 16 of the current fuse for a defined period of time, so that the characteristic shown in broken lines in FIG. 2 can be applied. After the charging capacitors 24 have been charged, the first fuse 16 of the current fuse acts and the limited current proud returns to the fully extended characteristic shown in FIG.

Said connection of the continuous stabilizer according to the invention is suitable wherever appliances with higher starting current, such as DC motors, are connected to the stabilized voltage.

Claims (1)

SUBJECT OF THE INVENTION Connection of a continuous voltage stabilizer with a time and voltage dependent current fuse, in which the base of the auxiliary transistor is connected both via a second auxiliary resistor to ground and through a series combination of a second resistor, a first resistor, a first shunt and a second shunt with an auxiliary transistor. and a second resistor connected via the first auxiliary resistor to the auxiliary terminal, characterized in that the output terminal (6) of the integrated circuit (4) is connected to a common terminal of the first shunt (10) and the first resistor (12) simultaneously with the input terminal (22) a flip-flop (21) whose output terminal (23) is coupled via a series combination of charging capacitors (24) and charging resistor (25) to the cathode of the diode (20) and simultaneously to the base of the shorting transistor (19) connected to the base of the first auxiliary transistor (16), the collector of which is connected via stabilization k an earth-leakage capacitor (3) with an integrated circuit (4) lowering terminal (9) and a collector of a second auxiliary transistor (17), the base of which is connected via a third resistor (18) to a common terminal of the first shunt (10) and the second shunt (11) and the emitter of the second auxiliary transistor (17) are coupled to the emitter of the first auxiliary transistor (16), the emitter of the shorting transistor (19), the diode anode (20), the flip-flop (21) and the output terminal (26) of the wiring.