SU1488772A1 - Multichannel power supply source with combined protection - Google Patents

Description

The invention relates to electrical engineering and can be used in power sources of automation and communication devices. The purpose of the invention is to expand the functionality and simplify the device for

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the expense of introducing protection against changes in the input voltage level of each of the channels and lowering each of the output channels and in control of the actuating element of protection. The source contains sensors of input and output voltages on the elements, regulating elements of 1 channels, switch 6, operational amplifier 8, optoelectronic devices 14 and 11, and actuating node 18 of protection. When changing the input or output voltage of the cell signal, switched

$ 6, enters one of the inputs of the operational amplifier 8, a current begins to flow through the light emitter 10 or 13, one of the photodetectors 12 or 15 turns on and a

U signal that enters the input of the actuating node 18 protection.1 Il.

The invention relates to electrical engineering and can be used in the sources of secondary power automation, computing, receiving and transmitting discrete information.

The purpose of the invention is to expand the functionality and simplify the device.

The drawing shows the structural principle of a multichannel source.

The source contains converter cells (voltage stabilizers) with regulating elements (of any type) 1.1-1.P, connected between voltages υ _0χ , -υ _βχη and and _{b | x1} - ^and vyh ' ^{sensors of} input voltage on resistors 2.1-2.P , 3.1-З.п, output sensors-on resistors 4.14 p, 5.1-5 p, the outputs of the input and output voltage sensors are connected to the corresponding input of the switch 6 controlled by the clock generator of 7 pulses, the output of the switch is connected to one of the inputs of the operational amplifier 8 , at the other entrance, which is connected source 9 e Alon voltage. The output of the operational amplifier 8 is connected to the light emitter 10 of the optoelectronic device 11, the photodetector 12 of which is connected to the Eid _{op circuit} , and the light _emitter 13 of the optoelectronic device 14, connected oppositely to the light beam 10, the photoreceiver 15 is connected parallel to the photoreceiver 12 through a resistor 16

11 and 13 are connected via resistor 17 to the midpoint (C ^ d-) of the source υ _Α0Πι to the connection point of the photodetectors

12 and 15 and limiting resistor

16 is included executive node 18 protection.

20 Elements 8, 9, 11, 14 and 17 form the protection actuator 19, the output of the 20.1-20.η protection blocks against overcurrent and short circuits is connected to the corresponding input of the switch 6, the operational amplifier 8 is powered by a bipolar power supply 21.

The power source works as follows.

30 In normal operation, i.e. in the absence of current overloads in each of the channels and the presence of their input and output voltages within the specified norms, all controlled

35 voltage values, switched to one input of the operational amplifier 8 with the frequency of the clock generator, adequate for the allowable time of avariyno40 specific mode such that the output voltage of the operational amplifier is close to the midpoint voltage source CSD _op. Through the light emitter 10 optocoupler 11 and the light emitter 13

45 and the optocoupler 14 current is not flowing. Photodetectors 12 and 15 of the specified optocouplers are not included and the signal to turn off the node 18 is not received.

Source Cdop. It can be formed using a parametric voltage regulator and a resistive divider, the midpoint of which is Q _srt — due to the very low power consumption from the source and the additional “skew” voltage does not play a significant role. As an executive protection node, a key amplifier acting on the control can be used5

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stabilizer element 1 or key element included in the common power bus of a multichannel source.

When the input or output voltage of the cell increases or decreases, the signal switched by node 6 enters one of the inputs of the operational amplifier 8, current begins to flow (depending on the polarity of the output signal of the amplifier 8) through the light ’emitter 10 or 13, one turns on

from photodetectors 12 or 15 and a signal is formed at node 18.

In case of short circuit or re-. load on. to the load current, the signal goes through the switch 6 to the amplifier 8 (the signal can be generated from an overload sensor connected in series with the regulating element, and then a key amplifier).

Thus, the proposed power supply provides combined protection when the load current or the input and (or) output voltage of any channel changes both upwards and downwards, thereby expanding the functionality of the power supply and using an operational amplifier with a source with midpoint and two optocouplers simplifies the actuator protection.

In addition, the LEDs of the optocouplers can, in the first approximation, carry out an indication of faults.

Claims (1)

Claim Multichannel power supply with a combined protection, containing converter cells, output voltage sensors by the number of cells,. Overload protection unit by current and short circuit, additional bipolar power source, reference voltage source ₅ , executive protection node, executive protection element, two resistors, characterized in that, in order to expand functionality and simplify 10 devices, a switch with a clock generator is introduced into it impulses, input voltage sensors according to the number of converter cells, two optoelectronic devices, with the outputs of the input and output voltage sensors of the needles of the overcurrent protection and short circuit protection devices connected to the inputs of the switch, the control input of which is connected to the output 20 of the pulse generator, the executive protection element is made on the operational amplifier, one of the inputs of which is connected to the output of the switch, the other to the output of the reference voltage source, the output to the first combined pins are counter-parallel switched on light emitters of optoelectronic devices;; · the second combined outputs of which 30 are connected through a resistor to the midpoint of an additional bipolar power source, light optoelectronic receivers are connected in parallel and connected to the first output of the additional bipolar power source by the first combined leads, and to the second output of the additional two-polar power supply to the second combined leads through a resistor, and the input of the actuating protection node, and the power inputs the op amp is connected to the outputs of an additional bipolar power source.