RU22728U1 - AC VOLTAGE REGULATOR - Google Patents

Abstract

An AC voltage regulator containing a serial circuit of a triac and a load connected to the terminals for connecting the network, a network voltage converter, an RS-trigger, a synchronization device, a digital counter, a matching device, a control device, an adjustable clock generator, while the output of the network voltage converter is connected with an RS flip-flop, a digital counter and with a synchronization device, and the outputs of the digital counter are connected to a matching device that is connected to the second input of the RS-tr ggera, which is connected to the output of the control device, characterized in that it triac control pulse forming is carried out without the use of charging or discharging the capacitor is used only digital integrated circuits and devices operating in switching mode, i.e., the digital principle of the formation of control pulses of the triac is used.

Description

DESCRIPTION OF THE INVENTION AC VOLTAGE REGULATOR.

The invention relates to electrical engineering and can be used to power active or reactive consumers of electricity, including welding machines, electric motors, lighting devices, electric resistance furnaces.

A known voltage regulator with a regulating element in the form of a triac 1, the disadvantage of which is the analogue method of generating control pulses of the triac, the drawback is that a capacitor is involved in the formation of the triac control signals, which, when the environment changes} | The capacitance can change at the temperature that affects the stability of the output voltage of the device. A prototype of this invention was not found among the known analogues, since even when constructing circuits on digital integrated circuits, the processes of charging or discharging a capacitor are used, as, for example, in 2.

The operation of the proposed AC voltage regulator is based on a change in the delay of the connection of the hub, relative to the beginning of half-periods of the mains voltage. Connection is made by an electronic key made on the triac. Since the triac is turned off only when the 7th load passes through zero, therefore, it is possible to power the inductive load. The delay is generated digitally, while the output voltage of the regulator can be changed not discretely, but smoothly.

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The technical result is to increase the stability of the parameters of the AC voltage regulator.

This goal is achieved due to the fact that the AC voltage regulator contains a serial circuit of a triac and a load connected to the terminals for connecting the network, the mains voltage converter, which generates short pulses, at the moment the mains voltage passes through zero. An RS trigger is connected to its output, which generates a triac enable signal, a synchronization device that prepares an adjustable clock, a digital counter that plays the role of a delay element. The output of the adjustable TaicroBoro generator is connected to the counting input of a digital counter, the outputs of the counter are connected to a matching device, the output of which is connected to the second input of the RS-trigger. A control device that performs the function of matching the output of the RS trigger and the control circuit of the triac is connected to the output of the RS-trigger and is a current amplifier. The control electrode of the triac is connected to the output of the control device.

The invention is illustrated in the drawing, which shows: a voltage converter 1, a synchronization device 2, an adjustable clock 3, a flash counter 4, a coincidence device 5, an RS-trigger 6, a control device 7, a serial circuit consisting of a triac 8 and a wire 9, which leads 10 and 11 are connected to the network.

The device according to the invention operates as follows. The voltage converter 1 forms a rectangular

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pulses from half-periods of the sinusoidal voltage of the network; as a result, short pulses are formed at its output at the moments when the network voltage passes through zero. Further, from the output of the mains voltage converter, the pulses are fed to the input R of the RS-flip-flop 6, which is set to zero, prohibiting the tripping of the triac 8, to the reset input of the digital counter 4, setting it also to zero, to the device cin) qx down 2 preparing an adjustable clock 3. By cutting the pulse from the line voltage converter, the adjustable clock starts to issue pulses to the digital counter. After the arrival of 15 pulses, at the output of coincidence device 5, logical level 1 appears, including thereby the RS trigger, which, through the control device 7, turns on the triac. Since the logic 1 signal at the output of the RS-flip-flop is maintained until the end of the half-cycle of the mains voltage, the reliability increases with (} the tripping of the triac during inductive fault. When the load current 9 passes through zero, the triac closes, and the cycle repeats for the next half-cycle. generator, you can smoothly change the delay on the triac and thus adjust the voltage on the hub.

Sources of information

1. The copyright certificate of the Russian Federation1 and No. 2108652 cl. H 02 M 5/257

2. Copyright certificate of the Russian Federation No. 2149494 class. H 02 M 5/257

Claims (1)

An AC voltage regulator containing a series circuit from a triac and a load connected to the terminals for connecting a network, a network voltage converter, an RS-trigger, a synchronization device, a digital counter, a matching device, a control device, an adjustable clock generator, while the output of the network voltage converter is connected with an RS-trigger, a digital counter and a synchronization device, and the outputs of the digital counter are connected to a matching device, which is connected to the second input of the RS-tr ggera, which is connected to the output of the control device, characterized in that it triac control pulse forming is carried out without the use of charging or discharging the capacitor is used only digital integrated circuits and devices operating in switching mode, i.e., the digital principle of the formation of control pulses of the triac is used.