SU485559A1 - Dc circuit switch - Google Patents

Description

(54) DC SWITCH CIRCUIT

one

This invention relates to impulse.

technology and can find use of B devices for regulating and controlling

different values (for example, creeping speed of electric drives, temperature), which must be maintained in specified

the limits.

DC switches are known to contain the first and second controlled switches with an S-shaped volt-ampere characteristic, the first transistor, the emitter of which is connected to the common bus of the switch, and the collector is connected to the control electrode of the first switch with an S-shaped volt-ampere characteristic and through a resistor ; - to the power supply bus, the second transistor, the base of which is connected to the midpoint of the first resistive voltage divider connected between the input and the total commutator width, and the second resistive voltage divider.

However, the known switch does not provide a sufficiently deep adjustment of the return coefficient, and in a small signal

The mode does not have a relay characteristic at all.

The aim of the invention is to provide a relay characteristic in a small signal mode and to increase the depth of return coefficient control.

For this, a second switch with an S-shaped volt-ampere characteristic is connected to the output of the power supply through the first switch connected in series with the load and its control electrode is connected to the midpoint of the second resistive voltage divider connected in parallel to the first resistive voltage divider, and the second transistor connected by its emitter to the emitter of the first transistor, the collector - to the base of the first transistor and through a resistor to the supply bus, the nerve and the second keys with an S-shaped volt-ampere This characteristic is connected in accordance with each other, and the first and second resistive voltage dividers contain variable resistors. The drawing shows a circuit diagram of a switch. The switch of the direct current circuit contains the first and second controlled keys 1, 2 with the S-shaped current-voltage characteristic, the first transistor 3, the second transistor 4, the power supply bus 5, the common bus b, the input 7, the resistors 8 and 9, the first a resistive voltage divider containing a variable resistor 11, a second resistive voltage divider containing an interchangeable resistor 12, with the second depot 12 connected in parallel with the first divider 11. Transistor 3 is connected by an emitter. to bus 6 and to the emitter of transistor 4 by a collector to the control electrode of key 1 and through a resistor 8 to the supply bus 5, and the base to the collector of transistor 4 and through a resistor 9 to the bus 5. The base of transistor 4 is connected to the midpoint of the divider 10 connected between input 7 and common bus 6, Key 2 under the keys to the output of the power source through serially connected key 1 and load 14, and its control electrode is connected to the midpoint of the resistive divider 12. I Keys 1 and 2 are connected according to each other with a friend. The switch works as follows. At small values of the signal at input 7, transistor 4 is turned off, transistor 3 is saturated with current / flowing through resist 9, and key 1 is closed. As the signal at input 7 grows, transistor 4 turns on, transistor 3 is KJHoled and a positive voltage from supply wiring 5 is applied to control electrode of key 1 through resistor 8. Key 1 is ready for unlocking, but current does not pass through it, as key | 2 is closed. With a further increase in the signal at input 7, key 2 is unlocked. As a result, key 1 is unlocked and the load circuit is closed. Thanks to the relay characteristic of switches 1 and 2 D1, the increase in the signal at input 7 does not change the load current 14. When the signal at input 7 decreases, the transistor 4 turns off. Transistor 3 switches to a saturated state and connects the control electrode of key 1 to a common bus 6, which ensures locking the key 1 and opening the load circuit 14 ,, Thus, the moment of switching on the proposed switch is determined by the moment of unlocking the key 2 and controlled by the variable resistor 13, and the moment of switching the switch off is determined by Key 1, caused by saturation of transistor 3 due to switching off of transistor 4, is controlled by resistor 11. Subject of invention A switch of a direct current circuit containing first and second controlled keys with an S-shaped volt-ampere characteristic, the first transistor, the emitter of which is connected to a common bus switch and the collector is connected to the control electrode of the first switch with a S-shaped volt-ampere characteristic and through a resistor to the power bus, the second transistor, the base of which is connected to the midpoint A first resistive voltage divider connected between the input and the commutator common bus and a second resistive voltage divider, which is the second key with an S-shaped voltamper to provide a relay characteristic in the small signal mode and increase the depth of the return ratio control The characteristic is connected to the output of the power source through the first switch connected in series with the load and connected to the midpoint of the second resistive divider by its control electrode. connected parallel1) BUT to the first resistive voltage divider, and the second transistor is connected by its emitter to the emitter of the first transistor, KOJi.ueKTOpoM - to the base of the first transistor I through a resistor to the power supply1 | e, and the first and second shifts with Om-shaped volt-ampere characteristic according to another1 On the other hand, and the 5th and second resistive voltage dividers contain variable resistors.

ABOUT

at

€)

Have