SU1086502A1 - Automatic load switching device - Google Patents

Abstract

DEVICE FOR AUTOMATIC SWITCHING, LOAD, containing the main and backup sources; power supply, the first driver of two synchronized rectified sinusoidal signals, a comparator and the executive body, the first driver of two synchronized rectified sinusoidal signals contains a transformer with two secondary windings, an autogenerator of stabilized sinusoidal voltage, the first and second rectifier bridges, the primary generator of a transformer with a sinusoidal voltage, the first and second rectifier bridges, the primary generator of a transformer with a sinusoidal voltage, the first and second rectifier bridges, the primary generator of a transformer with a sinusoidal voltage, the first and second rectifier bridges, the primary generator of a transformer with a sinusoidal voltage, the first and second rectifier bridges, the primary generator of the transformer, and the input of the first shaper of two dix-rectified rectified sinusoidal signals, one secondary winding a first transformer via a rectifier bridge connected to the first output of the first two synchronized ers the formation rectified sinusoidal signals, another secondary winding of the transformer is connected to the clock input of the oscillator to stabilize. a sinusoidal voltage, the output of which is connected via the second rectifier bridge to the second output of the first one. synchronized rectified sinusoidal signals, the latter input is connected to the main power source, and the load is connected via short-circuit contacts of the actuator to the main power source, and through the disconnecting contacts of the executive body, the load is connected to the backup power source This is due to the fact that, in order to increase reliability, the second shaper of two i synchronized rectifiers is additionally introduced into it. sinusoidal signals similar to (L first, first and second analog dividers, bias voltage source and first and second separator diodes, the input of the second driver of two synchronized rectified sinusoidal signals connected to the backup power source, the first and second outputs of the first driver of two synchronized rectified sinusoidal signals are connected respectively to the first and second inputs of the first analog divider, the first and second outputs of the second shaper of two synchronized rectified sinusoidal signals are connected respectively to the first and second inputs of the second analog divider, the outputs of the first and second analog dividers are connected to the inputs of the comparator, the output of the comparator is connected to the input of the actuator, and the voltage source is biased

Description

Neither through the first and second partitions with the second inputs of the first and second diodes are connected, respectively, analog dividers.

1086502

The invention relates to energy and can be used in systems of redundant and guaranteed power supply equipment.

A device for automatic switching of a load is known, which contains a transformer with two secondary windings, the primary winding of which is connected to the main network, a stabilized on-voltage auto-oscillator, a differential amplifier, a rectifier, a key element and an execution relay D J.

The disadvantage of this device is the low reliability of the power supply with a possible decrease in the voltage in the backup network, because the device does not have voltage control elements of the backup network.

It is also known a device for automatically switching a load from one source to another, containing two similar source voltage analysis blocks, each of which includes a voltage sensor connected to a threshold element, a trigger, a Banning logic circuit, and an impulse generating unit with a SRI command connected to input element with memory memory2

The disadvantage of this device is also low reliability. supply the load, since, with the possible simultaneous reduction of the voltage of the main and backup networks to a level below the threshold settings, the load is not transferred to the source having the highest voltage.

The closest in technical terms to the invention is a device for switching power supply, containing a main and backup power source, the first generator of two synchronized rectified sinusoidal signals.

comparator and an actuator, wherein the first shaper two synchronized rectifying signals comprises tra1nsformator with secondary windings oscillator stabilized synusovdalnogo voltage, first and second rectifier bridges, the primary winding of the transformer is connected to the input of the first two synchronized rectified sinusoidal signals, one secondary winding transformer through the first rectifying bridge connected to the first output of the first two synchronizer driver rectified sinusoidal signals, the other secondary winding of the transformer is connected to the synchronizing input of a stabilized sinusoidal voltage oscillator, the output of which is connected to the second source of the two synchronized rectified sinusoidal signals via the second rectifying bridge, the last and the second outputs of the imager of two sihroiizirovannyh rectifying sinusoidal with gnalov connected corresponding continuously with the first and second inputs of the comparator, the comparator output is connected to the input of the executive body, and a load is connected via make contacts of the main body with the power source, and through the break contacts executive load connected to the standby power source Cs.

The disadvantage of this device is also the low reliability of the power supply at a possible voltage of the backup network, since the device does not have voltage control elements in the backup network.

However, there are a number of responsible ac electricity consumers that do not allow interruption of power (for example, information transmission equipment), for ensuring their reliable operation, the supply of electrical energy from a source having the highest voltage is required.

The aim of the invention is to increase the reliability of the device.

This goal is achieved by the fact that the first shaper of two synchronized straightened sinusoidal signals, a comparator and an actuator, the first shaper of two synchronized straighteners, are included in the device for switching the loading, containing the main and re-source power sources. -negative sinusoidal signals -contains transformer with two secondary windings oscillator stabilized sinusoidal voltage, the first and second rectifier bridges, the primary winding of the transformer is connected to the input of the first two synchronized rectified sinusoidal signals, one secondary winding of the transformer via the first-in bridge wp mitelny connected to the first output of the first imager of two synchronized rectified sinusoidal signals, another secondary washing The transformer weave is connected to the synchronizing input of a stabilized sinusoidal voltage oscillator, the output of which is connected via the second rectifier bridge to the second output of the first driver of two synchronized rectified sinusoidal signals, the input of the latter is connected to the main power source, and the load is connected through the actuator closing contacts with the main power source, and through the breaker contacts of the executive body the load is connected to the backup source th power additionally introduced second generator synchronized two rectified sinusoidal signal similar to the first, the first and second analog dividers bias voltage source and the first and second separating diodes, wherein the input

The second shaper of two synchronized rectified sinusoidal signals is connected to a backup power source; the first and second outputs of the first shaper of two synchronized rectified sinusoidal signals are connected respectively to the first and second inputs of the first analog splitter, the first and second outputs of the second shaper of two synchronized rectified sinusoidal signals connected respectively to the first and second inputs of the second analog divider, the outputs of the first and second ana Ogove dividers are connected to the inputs of the comparator, the comparator output is connected to the input of the executive body, and the source of bias voltage via first and second diodes coupled separator; us respectively to second inputs of the first and second amplifiers .analogovyh.

The drawing shows the functional diagram of the device; the diagram shows: UQ, Up, U — instantaneous values of the voltages of the main source, backup source and self-generator of stabilized sinusoidal voltage, respectively; t - time

The device contains a load 1, the executive body 2 (for example, an electromagnetic relay) with opening contacts 3 and closing contacts 4, a comparator 5, two analog dividers 6 and 7 ,. performed, for example, on the basis of operational amplifiers, performing logarithm operations on the input signal value, subtracting and taking the difference anti-logarithm, mixing source 8, dividing diode 9, and shapers 10 and 11 of two synchronized rectified s1 (use signals, each of which consists of a transformer 1 with two secondary windings 13 and .14, an oscillator 15 of stabilized sinusoidal voltage and two rectifying bridges 16 and 17. The secondary winding 13 of the transformer is connected to the blue the autogenerator 15 input; the other secondary winding 14 and the aBToresiepaTopa output are connected via the rectifier bridges 16 and 17 to the first and second inputs of the analog divider. The inputs of the drivers 10 and 11 (the primary winding 18 of the transformer) are connected to the main and backup sources. The device operates as follows. The voltage U 11 s taken from the secondary winding 14 of the transformer and proportional to the voltage of the main network is rectified by bridge 16 and fed to the first input. Divisible analog divides L voltage, and a second input fed Dely Tel rectified voltage output from the oscillator 15 biJshzipovannogo art. sinusoidal voltage. The voltage at the output of the oscillator Up is synchronized by the voltage of the main source through the secondary winding 13, i.e. ip Up sintuit, therefore, at the output of the analogue voltage divider 6 there is a constant signal proportional to the ratio of the instantaneous values of U and Uj., i.e. UQ / UP for any point in time (except for the moment). Zero crossing voltage of the oscillator .15). . The rectifying bridges 16 and 17 are intended to be fed to the inputs of analog voltage dividers having the same sign. . Since the driver 11, connected to the backup source with the voltage Up, is controlled similarly to the driver 10, and its frequency of the autogenerator is equal to the voltage of the backup source, the output of the analog divider 7 is absent-. There is a constant signal proportional to the value of Up / U. To ensure the correct operation of the device, it is necessary that the amplitudes of the voltages of the drivers of both drivers be equal. The voltages from the outputs of the dividers 6 and 7 of the voltage are supplied to the input of the compressor 5. In the case when the amplitude (action) value of the voltage of the main source exceeds the voltage of the backup source, i, e, when the Ug device is in the initial state : the output signal of the divider 6 exceeds the signal of the divider 7, the comparator 5 is in the initial state of the scientific research institute, the executive body 2 is de-energized, and the power to the load. 1 is carried out from the main source through closed contacts 3. When the voltage of the main source decreases, there comes a moment at which UQ Up. The output signal of the divider 7 exceeds the signal of the divider 6, the comparator 5 is triggered, the actuator 2 is triggered, and the load is automatically connected to backup source contacts 4,. . It should be noted that the appearance of the signal at the output of the comparator 5 occurs almost instantaneously in the zone of voltages other than zero. The delay is possible only in the zone of voltage crossing through zero, whose width is defined by the smallest voltage value at the second input of the analog divider, which ensures the specified accuracy of the division operation produced by elements 6 and 7b. To eliminate the operation Division into zero in the circuit of the device - a source 8 of a constant voltage of a small magnitude, connected through dividing diodes 9 to the second inputs of elements 6 and 7, is introduced, which ensures the supply of voltage to these inputs at the time of Zero transition voltage of the oscillator 1.5, the effect of interference caused by a short-term decrease in the voltage at the output of the divider LR at the moment Pere (the passage through the voltage of the oscillator 15 is eliminated, for example, by using an electromagnet A relay that has a delay for switching on and off. The device possesses higher reliability than the prototype due to the automatic connection of the load to the source having the highest voltage (actually the value of sinusoidal voltage) while practically maintaining the speed of the prototype device. and a wider field of application of the proposed device. It should be noted that the main and backup networks can have voltages different in frequency and phase,

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Claims (1)

DEVICE FOR AUTOMATIC SWITCHING, LOADS, containing primary and backup power sources, a first shaper of two synchronized rectified sinusoidal signals, a comparator and an actuator, the first shaper of two synchronized rectified sinusoidal signals contains a transformer with two secondary windings, a first sinusoidal voltage regulator and a second oscillator rectifier bridges, the primary winding of the transformer is connected to the 'input of the first form rovatelya two binhronizirovannyh rectified sinusoidal signals, one secondary winding of the transformer through. a first rectifier bridge connected to the first output of the first two synchronized You are a ^driver; direct sinusoidal signals, another secondary winding of the transformer is connected to the synchronizing input of a stabilized sinusoidal voltage oscillator, the output of which through the second rectifier bridge is connected to the second output of the first, shaper of two. synchronized rectified sinusoidal signals, and the input of the latter is connected to the main power source, and the load is connected through the closing contacts of the executive body to the main power source, and through the opening contacts of the executive body the load is connected to the backup power source, characterized in that / in order to increase reliability , a second shaper of two synchronized rectified ones is additionally introduced into it. sinusoidal signals, similar to the first, the first and second analog dividers, a bias voltage source and the first and second. Separating diodes, the input of the second driver of two synchronized rectified sinusoidal signals connected to a backup power source, the first and second outputs of the first driver of two synchronized rectified sinusoidal signals connected respectively with the first and second inputs of the first analog divider, the first and second outputs of the second shaper of two synchronization th e rectified sinusoidal signals are respectively connected to first and second inputs of the second analog divider, the outputs of the first and second analog dividers are connected to the inputs of the comparator, the comparator output is connected to the input of the executive body, and the source voltage displacements <5 ώ and.L o 00 □ 5 SL О N0 Niya through the first and second partitions with the second inputs of the first and second · diode connected respectively to the analog dividers.