SU1226425A1 - Device for controlling power - Google Patents

Abstract

This invention relates to power regulators in a load supplied from an AC network. The purpose of the invention is to simplify and increase reliability. The controller contains a series-connected full-wave rectifier 4, a phase extraction block 5 (BVNF), a key 6 and a single-vibrator 7. The rectifier input 4 is connected to the secondary winding of the transformer 3 of the mater 3. The primary winding of the transformer 3 is connected to a variable source current and is connected in parallel with the circuit of the series - connected load 1 and the alternating current thyristor switch 2 (TCTP). The control input of TSCPT 2 is connected to the output of the one-shot 7. Power outputs (L

Description

BVNF 5 are connected to the power supply terminals of a single vibrator 7. In the event of an accident in trans ™ formatter 3 or rectifier 4, the voltage at the output of the latter disappears, and the output voltage increases at BVNF 5. Key 6 opens 5 off ™

The invention relates to converter technology and can be used to control the power of a load supplied from an AC network, for example, to control the temperature in various electric heaters.

The purpose of the invention is to simplify and increase the reliability of the device.

FIG. Fig. 1 shows a diagram of a pea-- (device lization; Fig. 2 shows time diagrams of currents and voltages.

The device circuit contains UZZKU 1, thyristor key 2 of alternating current, transformer 3, two-half; - cyclical rectifier 4, block 5 of separation of phase zero, key 6 and one-oscillator 7, At this load I is connected in series with thyristor klkg- 2 AC, the control of the PCLI input of which is connected to the output of the one-vibrator 7, the synchronization input of which is connected to the output of Ksyuch 6, and its power bus connection: to the terminals for connecting the power supply, and to the para-linearly connected load I and the thyristor 2 key the primary winding of the transformer 3, the secondary winding of which is connected to the input of the full-wave rectifier 4, the output of which through the extraction unit 5 of the phase zero is connected to the input of the key 6, besides the foro, the power supply of the block-phase zero zero is connected to power supply one-shot.

The phase selection block 5 is made on the transistor 8 and resistors, the key 6 is made on the transistor 12 and the resistor 13, the one-shot 7 is better on the resistor 14, the dual-base

The odnnobrator 7 is closed and the TCTP 2 is closed. The introduction of BVNF 5 ensures that the voltage applied to the load I is greater than the required voltage, which leads to d, more than the set goal, 2 sludge.

five

0

5 0 5 0

0

di: ode IS, pulse transformer 16, EC circuit 17 and 18.

The principle of operation of the device for ™ is as follows.

When the input voltage passes a zero value (phase zero), the alternating current thyristor switch 2 is turned off. In this case, the input voltage of the full-wave rectifier 4 is close to or equal to zero (C, Fig. 2) ja the voltage at the output of the allocation unit 5 phase zero is equal to the supply voltage of the single-oscillator power supply (and e; Fig. 2) . The key 6 is opened, producing a discharge of the capacity of the time - driving circuit of the single vibrator 7. This discharge ensures the synchronization of the start of charging, the time of the rear of the capacity of the single vibrator 7 and the passage time of zero value (zero phase) by the input voltage. After the input voltage passes a zero value, the active device of the allocation unit zero phase 5 opens, thereby closing key 6, Immediately for the time of the single-vibrator 7 master capacitance begins to increase (U, fig 2) when the threshold value of the one-vibrator 7 is reached generates an AND) a pulse (i.;, fig 2) that unlocks the thyristor ac KJBo4 2. In this case, a current appears in the load circuit, which flows through the input voltage of zero value to the next transition (if, Fig. 2). Changing the time parameters — the QC circuit of the one-cycle 7 can change the output power level. In the event that the parameters are time for a chain, such that the single vibration 7 produces not one, but two pulses for. the half-period of the supply voltage, this does not lead to a change in the principle of operation S since

/

3

the second pulse arrives at the already open thyristor key 2 of alternating current.

Claims (1)

In the event of an accident in the transformer 3 or full-wave rectifier 4, the voltage at its output disappears, which leads to an increase in the voltage at the output of the block 5 in the split section of the phase. In this case, the key 6 is unlocked, thereby ensuring the shutdown of the single vibrator 7. When the supply voltage of the single vibrator 7 disappears. Due to an accident at the power source, the thyristor switch / 2 AC is closed, since its control input does not receive start-up pulses. This eliminates the possibility of applying to the load 1 a voltage greater than necessary, i.e. reliability of its trouble-free work increases. Invention Formula A power control device comprising in series 26425 connected leads for connecting the load and an AC thyristor key, the control input of which is connected to the output of a single vibrator; the synchronization input of which is connected to the output of the key, and its power leads are connected to the outputs for connecting a power source; 10 connected pins for connecting the load and the AC thyristor switch of the alternating current included the primary winding of the transformer, the secondary winding of which is connected to the input 15 of the full-wave rectifier, due to the fact that, in order to simplify and increase the reliability, a separation block zero phase is entered into it, the input of which is connected 20 with the output of the full-wave rectifier, and the output with the key input, while the power supply leads of the phase zero phase unit are connected to the power supply leads of a single-vibrator. TO Well one , gh Editor E. Papp Compiled by Y. Andreev Tehred I.Veres Order 2132/47 Circulation 836 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, F-33, Raushsk nab., ld. 4/5 Production and printing company, Uzhgorod, st. Design one t FIG. 2 I / Proofreader T. Kolb