SU1545290A1 - Device for stabilized supply of energy receivers - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to electric power supply by a direct current to consumers of their own needs at power plants, and can be used to power receivers that consume electricity, which differ in their characteristics. The purpose of the invention is to improve the reliability of power. The device contains a power source and terminals for connecting the load. Between them, two conversion channels are included, each of which is made in the form of a controllable key, a constant-voltage converter and a separating diode element. New in the device is supplying it with a current sensor, and the protection unit additionally contains an RS trigger, two intermediate relays, an OR element, a delay element, a driver, an amplifier, and the converter also includes an output voltage control unit and a key sensor regulatory element converter. In the event of a fault in one of the conversion channels, the load is supplied from the other parallel channel. 1 hp f-ly, 5 ill.

Description

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a battery 3, two identical channels 4 and 4 converting a constant voltage into a constant voltage and terminals 5 for connecting energy receivers. Each channel A (4) converts a constant voltage into a constant rectifier controlled key 6, a converter. 1 7 a constant voltage is permanent, a separating diode element 8, a current sensor 9 and a protection unit 10

The constant voltage to constant voltage converter 7 consists of a key regulating element 11, an output voltage control unit I2 of the converter and a sensor 13 of the state of the regulating element 1-1.

The control input of the regulating element 11 is connected to the output of the control unit 12 and the first input of the state sensor 13, the second and third inputs of which are connected to the power input and the output of the regulating element 1 1. The outputs of the sensor 13 of the state and the protection unit 10 are combined and connected with the control input of the control key bis inputs Turning on the dropping of the unit 10 is sewn up and the unit 12 for controlling the other channel 4 for converting a constant voltage into a constant voltage. The first control input of the protection unit 10 is connected to the output of the DC / DC converter 7. The second control input of protection unit 10 and the feedback input of control unit 12 are connected to the output of separation element 8. The third control input of protection block 10 is connected to the measuring output of current sensor 9.

The protection unit 10 includes an RS trigger 14 with an orienting RC chain 15, sensors 16 and 17 for controlling the maximum and minimum voltages, respectively, the first and second intermediate relays 18 and 19, the logic element OR 20, the delay element 21, and the driver Amplifier 22 output signal. On the inverse R-input RS-trigger 14, the signal is turned on

channel, the formation of another channel 4 conversion of constant voltage to constant. The direct output of the RS flip-flop 14 is connected to the first intermediate relay 18 and through the first input of the logic element OR 28 is connected to the second intermediate relay 19. The second input of the logic element OR 20 is connected to the measuring output of the current sensor 12. First entry

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control unit 10 protection through the sensor

16 maximum voltage control and second control input via sensor

17 minimum voltage control

and the opening contacts of the second intermediate relay 19 are combined and connected via a delay element 21 to the driver-amplifier 22 of the output signal of the block 10. Parallel to the delay element 21, the closing contacts of the first intermediate relay 18 are turned on.

The output voltage control unit 12 (converter 2) can be made of RS flip-flop 23 with an orienting RC-chain 24, a comparison element 25, an integrator 26, a threshold element 27, a clock pulse generator 28, and two logic elements AND 29 and 30 The feedback output of the control unit 12 through the comparison element 25, the integrator 26 and the threshold element 27 is connected to the first input of the first AND 30 logic element. The first input of the second AND 29 logic element is connected to the output of the clock pulse generator 28. The second inputs of logic elements 29 and 30 are connected to the inverse output of the RS flip-flop 23,

inverse R-input of which forms the input Turn on the channel. The outputs of the logic elements 29 and 30 form the control outputs of the regulating element 1 1. Moreover, the element 29 controls the switching off of the element 11, the element 30 controls the switching off

The sensor 13 of the state of the regulating element (Fig. 3) contains an opto-diode pair 31, the photodiode of which operates in the photoresistance mode, and the led together with the series-connected resistor is connected in parallel with the regulating element 1 1. The output of the optocoupler 31 through the threshold element 32 connected to the 5 R input of the counter 33, to the clock input of which receives a control signal for switching off the regulating element 1 1.

As a control key 6, a circuit breaker having an independent trip with a guaranteed tripping time can be used. Current reed relays can be used as a current sensor.

The key regulating element 1 1 (FIG. 4) can be made of a main power thyristor 34, in parallel with which serially connected switching thyristor 35, a capacitor 36 and a choke are connected

37. The diodes 38 and 39 are switched in parallel with the thyristors J4 and 35. A shunt diode 40 is connected between the output bus of the regulating element 1 1 and the common bus of the source I and load.

For powering receivers that consume improved energy, the device contains a filter 41 with output terminals 42.

The device works as follows.

In normal operation, the device controlled switches 6 channels 4 and 41 of the DC voltage transformer are in a closed state. To all nodes of the DC voltage converter 7 and the protection unit 10 is stable. voltage. When the supply voltage is applied, the RS-triggers 14 and 23 of blocks 10 and 12 are oriented by RC-chains 15 and 24, to the input of which the voltage Un is applied (Fig. 1 and 2) to the supply of the device elements. The data state of the RS flip-flops 14 and 23 corresponds to the operation of the channels in reserve.

The device is turned on by giving a signal similar to the signal. The channel is turned on to one of the conversion channels, while the other channel remains in reserve. The constant voltage converter 7 of the switched on channel 4 converts the input DC voltage to a pulsed voltage that goes to the output terminals of energy receivers that are not sensitive to the shape of the input voltage, such as windings of electromagnets, DC motors, etc. . The continuity of the current in inductive energy receivers is provided by a diode 40 (Fig. 4).

FIG. 5 shows the diagrams of the operation of the device in the event of a malfunction in the transform backup channel. The following notation is used: UH is the voltage at the output of the converter of the working conversion channel; UH is the voltage at the output of the converter of the backup conversion channel; UH is the voltage at terminals 5; UH is the voltage at the output of integrator 26 of control unit 12; Ua is the response voltage of the threshold element 27 of the control unit 12; U VK signal to turn on the regulatory element 1 I; U 0-gk-signal to disable the regulating element I 1 with a period T; Uvs is the voltage on the power thyristor of the regulating element of the operating channel; Uea) (t (p mvu. Max. Voltage gages of the backup channel maximum voltage; U6J-voltage at the output of the unit is protected by the backup channel; Uy K is the output voltage controlled by the backup channel key.

The principle of compensatory-parametric stabilization is based on the operation of the regulation block I2. Since the key regulating element 11 of the constant-voltage converter 7 is used as the switching key, the feedback signal is taken after the regulating element 11. The feedback signal and the reference voltage U, (Fig. 2) are fed to the inputs of the comparison element 25, the output signal of the element 25 is integrated by the integrator 26 and is fed to the input of the threshold element 27, which generates a signal to open the regulating element 1I. Disabling the regulating element occurs with a frequency of 28 clock pulses. The operation mode of the control unit 12 is determined by the state of the trigger 23. When the RS-trigger 23 is energized, the RC-chain 24 is set to the state corresponding to the operation in standby. The signal at the inverse output of the RS flip-flop 23 blocks through logic gates And 29 and 30 the formation of the output signal of the control unit for controlling the control element. The RS-flip-flop 23 is reoriented by the signal Turning on a channel, which is generated when there is a fault in another conversion channel, with the help of a protection unit or a state sensor of this channel.

The state sensor 13 is a high-speed protection sensor. When the thyristor 34 is closed, the voltage across it through the opto-diode pair 31 and the comparator 32 sets the counter 33 to the zero state. The counter operates according to a periodic control signal of the regulating element 1I. Upon breakdown or false opening of the thyristor 34 of the regulating element 11, the reset of the counter 33 does not occur and after some time the output of the second discharge of the counter 33 is the signal from which the signal is turned on of the channel of the other conversion channel. This signal, acting on the controlled key 6, turns it off and simultaneously switches on another conversion channel 4.

The protection unit 10 is designed to independently control the output voltage of the DC-DC converter 7 in all modes of operation of the device, disconnect the faulty conversion channel and put another conversion channel into operation. The RS flip-flop 14 is set to the working condition by a signal. Channel is turned on. Deviation of the output voltage beyond the allowable range determined by sensors 16 and 17 controls the maximum and minimum voltages, respectively, when this process is longer than the response time of the fast protection. using the sensor 13 specified by the delay element 21, causes the block 10 to form a fault signal. The effect of this signal is similar to the effect of the signal of the state sensor 13.

When monitoring the conversion channel in reserve, the first intermediate relay 18, controlled by the direct output of the RS flip-flop 14, locks the delay element 21 by means of closed contacts and the formation of a fault signal occurs immediately after the occurrence of voltage at the output of the regulating element 11. The second intermediate relay 19, which is also controlled by the direct output of the RS flip-flop 14 via the logic element OR 20, in this mode of operation of the conversion channel, disconnects the minimum voltage protection from the break contacts.

The minimum voltage protection is also disconnected at high jolt current loads, which cause a short-term decrease in the voltage on the battery 3 and, as a result, a decrease in the output voltage. The protection is disconnected by the signal from the current sensor 9, which is supplied to the second input of the logic element OR 20.

If there is a malfunction in the conversion channel, which is in reserve, causing the voltage of the power supply source 1 at the terminals 5, the integrator 26 of the control unit 12 goes to a positive saturation state and the threshold element 27 does not generate a signal to turn on the regulating element 1I. However, the clock pulse generator 28 with a period T (FIG. 5) generates signals for the shutdown of the regulating element 11. The first signal to turn off after the occurrence of the fault turns off the power thyristor 34 of the regulating element 1 and a direct voltage applied to it on the switching capacitor 36, This voltage is fed to the input of the opto-one pair 31 of the state sensor 13, blocking its operation. When a voltage appears at the output of the backup converter, the sensor 16 monitors the maximum voltage of the protection channel protection block 10. when the regulating element 11 of the working conversion channel is turned off, the output signal of the sensor 16 for monitoring the maximum voltage of the block 10 is reset to the protection of the working conversion channel. Due to the absence of a delay in the output signal forming circuit of the protection block 10 of the backup conversion channel, a fault signal in it is generated immediately. The control key 6 of the malfunctioning conversion channel is disconnected, the voltage at the terminals 5 decreases to permissible limits and the device continues to operate.

The device for supplying loads sensitive to the shape of the input voltage contains a filter 41 common to both conversion channels 4 and 4, the output of which is connected to the output terminals 42 and forms the second output of the device (Fig. 1).

Claims (2)

Invention Formula 0 1. A device for stabilized power supply of energy receivers, containing a power source and terminals for connecting power receivers, between which two DC-DC conversions can be connected in parallel, each of which is designed as a controllable switch, DC-DC converter to a constant and separating diode element, as well as a protection unit, including sensors for monitoring maximum and minimum voltages, sensor input The control of the maximum voltage is connected to the output of the DC / DC converter, and the output of the protection unit is connected to the control input of the control key, characterized in that, in order to increase the reliability of the power supply, it is equipped with a current sensor connected between the separating diode element - coping and output terminals, and the protection block additionally contains a RS-trigger, two intermediate relays, an OR gate, a delay element, and a high-frequency output amplifier-amplifier; the inverse R-input of the RS flip-flop forms the channel is turned on, and the inverse S-input is connected to the orienting RC-chain, the RS-flip-flop direct output is connected to the winding of the first intermediate relay and the first input of the OR logic element, the inputs of the control of the maximum and minimum voltages form the first and second inputs control unit protection, respectively, and the second input of the OR element forms the third control input of the protection unit to which the measuring output of the current sensor is connected, the second input of the control unit is protected by the undervoltage control sensor, the closing contacts of the second intermediate relay, the winding of which is connected to the output of element a OR, and the first input of the protection unit, through the overvoltage sensor, are combined and connected to the delayed elements connected in series and the driver-amplifier, and the closing contacts of the first intermediate element are connected in parallel to the delaying element the relay, moreover, the constant voltage converter D constant consists of a key regulating -element, output voltage control unit of the converter using pulse-width modulation, having a feedback input, a channel enable input and a control output of a key regulating element, and a state sensor of a regulating element with one output and three inputs, the state sensor contains an opto-single pair, an LED which is connected in series with a resistor is connected between the second and third inputs of the state sensor, the output of the opto-diode pair is connected via a threshold element to the R input of the zero-voltage unit A binary counter, the clock input of which forms the first input of the state sensor, the output of the second discharge of the counter forms the output of the state sensor, the first input of the last is connected to the control output of the key regulating element of the control unit, and the second and third are connected respectively to the power input and output the key regulating element, the outputs of the state sensor and the protection unit are combined and connected to the inputs. Turning on the channel of the block is sewn up and the control block of another channel the aprons into the constant, the feedback input of the control unit and the second input of the control unit of the protection unit are connected to the output of the coupling diode element. 2. The device according to claim 1, characterized in that, in order to improve the mass and size parameters, a filter is connected parallel to the terminals for connecting the energy receivers, which forms the second output of the device for powering the receivers requiring improved energy quality. w o o cm in r m I