SU1551209A1 - Triac control device - Google Patents

Description

(46) 15.01.91. Bul 2

(21) 4427590/07

(22) 05/17/88 (72) S. F. Gibalin

(53) 621.316.727 (088.8)

(56) .J. Lenk. Electronic circuits, practical guide. - M .: Mir, 1985, p. 199, fig. 7.7.

USSR Author's Certificate 665390, cl. H 02 M 1/08, 1979.

(54) DEVICE OF THE BALLET FOR CONTROL OF THE SISTOSTER

(57) The invention relates to electrical engineering and can be used for triac switching switches. The purpose of the invention is to reduce the turn-on angle of the simulator 4 by increasing the rate of rise of the control current. This goal is achieved by introducing the switching element 6, which provides the discharge of the capacitor 2 to the control. The blue junction 4 transition to the MOMent mains voltage zero crossing. 2 Il.

&

Yes

1

The invention is RELATED to electrical engineering and can be used to control the proximity switch of switches

The purpose of the invention is to reduce the switching angle of the triac by increasing the slew rate of the control current.

Fig. 1 shows the circuit diagram of the device; in fig. 2 - diagram of the switching element „

The device for controlling a triac contains a limiter, for example, 1s, made, for example, in the form of two zener diodes — switched on. Through a chain of series-connected capacitor 2 and key 3, voltage suppressor 1 is connected to the control electrode of triac 4. Limiting raznete 5 is connected to one output of switching element 6 and to the junction point of voltage suppressor 1 and capacitor 2, On the anode circuit of the triac 4 is on load 7 connected to the terminal 8 of the AC voltage; terminal 8 also has a resistor 5 and a control output of the switching element 6; a second terminal of the alternating voltage 9 is connected to the cathode; pa 4 (limiter voltage 1 and to the other terminal of the switching element b. Parallelcho a control transition triac 4 included shuntiru- yuschy resistor. The load 7 may be different heaters ispopeovan ,, engines and

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Ko, mutating element-, 6 (fig „2) contains two parallels about connected gray-cell elements with conduction frame, to the transistor O, 1 13 respectively, In the circuit of the switching element 6, I also WITHOUT ™ limiting diodes 14, 15 and resistors 6, 17 ,

The device works as follows.,

Upon receipt of a positive (negative) half-wave of the mains voltage, capacitor 2 through a resistor 5, a switch 3 and a control circuit of the simisto ™

Step 4 is charged before the voltage defined by the voltage limiter 3. When the network voltage is over the zero voltage, the viipas

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the output of the switching element 6 through a resistor 1 7 turns on a pair of transistors 10, II (12, 13), and the capacitor 2 impelles down the control transistor of the triac 4 through the terminals of the switching element 6 and through the switch 3, after the discharge of the capacitor 2 switching element 6 comes to its original (closed) state. The switching-on angle of the triac 4 is due to its pulse start when the mains voltage goes over zero, with the energy of the capacitor 2 stored in the previous half-period of the mains voltage.

Claims (1)

Invention Formula A device for controlling a triac, whose cathode is connected to the first AC mains terminal, and the anode to the first load terminal, the second high-1 of which is connected to the second AC mains terminal, containing a key, the first output of which is connected to the first capacitor terminal The second terminal is designed to be connected to the control electrode of the triac, and a voltage limiter, the first terminal of which is intended to be connected to the cathode of the triac, characterized in that, in order to reduce the switching angles of the triac, the first and second resistors and the switching element, the first output of which is connected to the first output of the voltage limiter and the first output of the first resistor, the second output to the second output of the capacitor, the second output of the voltage limiter and the first output of the second resistor, the second output of which is connected to the control the output terminal of the switching element and is designed to connect to the second output of the load, and the second output of the first resistor is connected to the first output of the key, and the switching element is designed as an x antiparallel two diodovj first total point which is the first terminal of the switching element and is connected to a first terminal of a first resistor, a second terminal connected to the collector and base of the first and second transistors forward conduction, respectively, and the collector and base of the first and second 5155 reverse-conductance transistors, respectively, the emitters of the second direct-transistor and the second reverse-transistor, are connected and connected to the second common point of two diodes and the first terminal of the second resistor, the second terminal of which is the control terminal of the first 1P R L .. 09 direct transducer transistor and the first reverse transistor transistor, the bases of which are connected to the collectors of the second transistor, direct transistor transistor and second reverse transistor transistor, respectively, are combined and used as the second output of the switching element. 71 Yes TO GC J7 L-Ј Ch-b J 1