Block for modeling overload in electric power circuits

FIELD: technology for testing radio-electronic equipment devices complex for resistance to interference effects.

SUBSTANCE: block for modeling overload in electric power circuits contains two controlled elements, connected serially and forming two-pole force output, two diodes, first outputs of which are connected and form a controlling input, and second outputs are connected to controlling inputs of controlled elements, two threshold stabilitron-resistor devices, outputs of which are connected to controlling inputs of controlled elements, stabilitrons of threshold stabilitron-resistor devices are connected to one pole of force output, resistor of first threshold stabilitron-resistor device is connected to second pole of force output, and resistor of second stabilitron-resistor device is connected to common point of enabled serially controlled elements.

EFFECT: increased reliability of used radio-electronic equipment.

4 dwg

 

Block modeling overload in the power supply circuits of electronic equipment (REE) relates to the fields of electrical engineering and electronics and can be used when testing devices REA in relation to durability and resistance to interference, in particular, dangerous impulse current and voltage overload in the circuit.

The known device in which noise generated when the work is connected to the power supply CEA (power supply output) closing regulatory body or contact [1]. This type of device can be used to simulate overload or short circuit in the power supply circuit REA.

Pulsed interference occurs first, due to the abrupt change in current and the magnetic flux at the time of occurrence of an overload or short circuit and, secondly, due to the EMF of self-induction inductance of the power bus at the time of turn-off current overload or short circuit. When the impact of such interference REA may not only wrong to do (or not do) this or that team, which in itself is unacceptable, but to fail. To simulate such interference when testing REA stability and resistance to interference requires a powerful simple and reliable base, be sure to provide at the same time protecting the audited REA, if your protection is and CEA does not cope with the level of simulated noise. Otherwise, the emission voltage at or after the intervention is able to instantly incapacitate tested REA containing semiconductor devices and integrated circuits.

However, the aforesaid device is not redundant, does not have regulatory and protective properties, so unreliable and being used as a simulator overload may be damaged itself and disable tested CEA or its power source. In this regard, it cannot be recommended for use as a simulator of noise in the circuit.

Increase the reliability of such devices is possible by their redundancy and ensure regulatory and protective properties. However, in available to the author and to the applicant the information sources not detected device that is able to simulate congestion and interference on the power supply circuits arising from these overloads, and similar technical performance and the achieved effect to the proposed device. In this regard, then the proposal is considered without the characteristics of known (restrictive) part.

The objective of the proposal was to increase the reliability of the test CEA by providing testing in terms of actuation blocks enable and protect the electronic equipment from overcurrent and voltage determine the level of SIP is ostoichivisti by providing a given simulation mode overload and protecting REA in case of failure of protective equipment the REA.

This task is solved in that the block modeling overload in a circuit contains two managed element, connected in series and forming a bipolar power output, two diodes, the first conclusions which are connected and form a control input, and the second terminals of the diodes are connected to control inputs of managed elements, two threshold stabilitron-resistor device, the Zener diodes which are connected with one pole of the power output, the resistor of the first threshold stabilitron-resistor device connected with the second pole of the power output and the resistor of the second threshold stabilitron-resistor device is connected to a common point connected in series managed elements, the outputs of the threshold stabilitron-resistor devices are connected to control inputs of managed elements.

In addition, the block modeling overload in a circuit with two additional resistors are connected in parallel to the first and second driven elements.

Figure 1 shows a basic block circuit simulation overload in the power supply circuits of the inspected equipment. Figure 2 presents the block diagram modeling overload in the power supply circuits of the inspected equipment, equipped with additional resistors.

By function, the Prince of the PU activities and methods of application of both schemes are equivalent. Certain characteristics of their operating modes are described below.

Figure 3 and 4 shows examples of usage (connection) of the device under test CEA in terms of its operation units overload protection by current and voltage respectively. Moreover, the device according to scheme 1 and 2 connected in the same way.

Figure 1 and other drawings used the following notation:

VT1 and VT2 - driven elements that provide current overload;

VD1, VD2 - diode Zener providing together with VT1 and VT2 specified voltage limits of impulse noise on the power supply circuits (at the level of the maximum allowable voltage u n and mMAXfor tested devices REA);

R1 and R2 resistors, to which is allocated the control voltage, if the noise voltage is more acceptable, with the diodes VD1 and VD2 in conjunction with resistors R1 and R2 form a threshold stabilitron-resistor device VD - R1 and VD2 - R2, and their outputs connected to control inputs of managed elements VT1 and VT2;

VD3, VD4 - diodes, one of the electrodes (in the drawings - anodes) which form a control input device for modeling noise in the power supply circuits, and the second (cathode) is connected to the control inputs of the controllable elements VT1 and VT2;

R3 and R4 is an additional resistors connected to 2 computers is Ino managed elements VT1 and VT2;

U0, U1, U2 - circuit diagrams of the proposed device and the corresponding voltage on them (see below). Chain U0 adopted for the bus.

Parallel connection of identical control circuits VD1 - R1, VD2 - R2 and VD3, VD4 and serial controlled items VT1 and VT2 in the unit can improve its reliability and to avoid unexpected short circuits. If you use only one driven element, it is possible that it crashes during or after the simulation of congestion and, in turn, incapacitate not yet approved CEA or the power source.

Figure 3 and 4 and in the text the following notation is used:

1 - power supply G REA having the maximum voltage value equal to u n and mMAX,

2 - load resistance or normally operating the device scanned REA (or system of interconnected devices, equipped with necessary internal protection system), conventionally denoted by RN,

3 - block inclusion and protection device 2 RN and the power source 1 G from overcurrent, connected in series with a switched and protected by the device 2,

4 - protection block power bus and devices REA overload voltage, providing a full-time surge protection (as part CEA) level U4slightly above the maximum normal stress Pete the s u n and m MAX,

5 - the proposed modeling block overload in the circuit, while protecting the devices REA overload voltage level U5in that case, if the block 4 protection does not work at the level of U4in trials of CEA. Must always be respected ratio U5>U4>u n and mMAX. It should be borne in mind that the voltage protection U5provided by block 5 in figure 3 and figure 4, must not exceed the value at which the audited REA may reduce its reliability.

L11 and L12 - inductance in the circuit (shown conventionally) is equivalent to the inductance of the wires connecting the power source G and tested CEA. In justified cases, it can be a real choke filters.

Connection of measuring devices for monitoring of currents and voltages not shown because it does not affect the substance of the bid. This can be applied to any known devices and methods of measurement. The change of the amplitude of the current pulse overload can be performed by changing the amplitude of the input pulse.

Performed the modeling block overload in the circuit (figure 1) as follows.

The unit has a control input, which is formed by diodes VD3 and VD4 and power output (pins U0 and U2). The output of U2 (power bus) is clucene the diodes VD1 and VD2 threshold stabilitron-resistor device VD1 - R1 and VD2 - R2. The resistor R1 of the first threshold stabilitron-resistor device VD1 - R1 is connected to the bus UO, and the resistor R2 of the second threshold stabilitron-resistor device VD2 - R2 are connected to a common point U1 connected in series managed elements VT1 and VT2. Two connected in series managed element VT1 and VT2 (preferably field-effect transistors for high-voltage circuits - transistor type IGBT; can be used with bipolar transistors, for which it is necessary to take measures to limit the base currents; to control "one-off" systems can be used thyristors) is connected between terminals U0 and U2 of power output. The outputs of the threshold stabilitron-resistor devices (common point of diodes and resistors of each such device) connected to control inputs of the managed elements. The General point U1 of the two series-connected controllable elements forms a technological chain, which is used when checking the health of series-connected controllable elements VT1 and VT2 at the stage of manufacturing and configuration of the unit. The control input unit through diodes VD3 and VD4 is also connected to control inputs of managed elements VT1 and VT2. In figure 2 these elements are shunted by resistors R3 and R4.

The block (figure 1) works as follows.

While tension is giving the power output unit (conclusions U2, U0) does not exceed the voltage stabilizing Zener diodes VD1 and VD2, the Zener diodes are closed, the voltage at the control inputs of the controllable elements (resistors R1 and R2) is equal to zero. In this case, both series managed element VT1 and VT2 are closed, and the current through them is absent (at least the total current does not exceed the amount of the leakage current of the Zener diodes and controlled items). In this mode the unit is in standby mode and starts to operate when the voltage on its power output U2 exceeds the threshold, namely when its power output (as well as on the tires checked REA figure 2 and 3) impulse noise.

When the occurrence of impulse noise, at which the total supply voltage and impulse noise exceeds a certain level, the Zener diode VD1 begins to pass current, the resistor R1 stands out voltage, which is applied to the control input of the control element VT1, it opens, and the voltage at point U1 is reduced to zero, the Zener diode VD2 also begins to pass current, the resistor R2 is allocated the voltage that is applied to the control input of the control element VT2. At this point, both the managed element VT1 and VT2 are opened and form a shunt between pins U0 and U2. The higher the emission of impulse noise, the more the control voltage and the SIL is its open managed elements. The amplitude of the current is thus limited to the internal dynamic resistance of the source of interference (managed elements VT1 and VT2 should have the necessary settings for voltage and output current). At the end of the impulse noise Zener diodes are closed, the voltage from the control inputs of managed elements removed, they also closed, and the unit goes back into standby mode.

If the control input of the block (on the anodes of the diodes VD3 and VD4) apply a pulse of positive polarity, regardless of the voltage level of the power output U2 relative to the shared bus U0 unit, managed elements VT1 and VT2 are opened and begin to pass current. The current value is determined by the amplitude of the input control pulse and the parameters of the elements VT1 and VT2. The current pulse can reach tens to hundreds of amperes. The maximum value of the current limit will be limited only by the ohmic resistance of the circuit and the resistance of the public managed elements. This mode is equivalent to a short circuit circuit connected to the proposed block.

After the end of the input impulse control managed elements are closed, and the current through them is terminated. If the unit is connected to a circuit containing inductance, it immediately raises the pulse of the EMF of self-induction and release of tension is placed on the power output unit U2. At this point, the unit begins to limit the discharge voltage, as described above.

Thus, the proposed device, working in two modes, can simulate overload in the power supply system CEA, and to protect her from the consequences of such overloads, if CEA their means (block 4 in figure 4) is unable to fend off the strain.

In CEA, the protection blocks 3 and 4 staff work as follows. The device 2 (Fig 3) included with unit 3 inclusion and protection (in the simplest case, the block 3 is a toggle switch and fuse or circuit breaker). In the event of an overload or short circuit in the circuit device 2, an unmanaged overload current Iz flowing from the power source 1 through the chain of "+U" - 3 - 2 - "-U". This should trigger block 3 inclusion and protection and disable device 2 from the power bus.

If the circuit inductances (figure 4) actuation unit 3 inclusion and protection for current overload causes the voltage impulse is due to the EMF of self-induction power supply lines. Unit 4 protection REA pulses from overvoltage on the power bus restricts these impulses at the level of U4that is slightly higher than the maximum voltage equipment u n and mMAX.

So in REA all the protection blocks 3 and 4 operate normally. When testing equipment protection settings of these blocks dollars which have to be checked, and when you first turned on and configured.

Application of the proposed modeling block overload in a circuit for testing the resistance of CEA to the impulse overload and its protection units 3 and 4 can be illustrated as follows.

To test the protective effect of block 3 inclusion and protection unit 5 modelling overload in the power supply circuits connected to the audited REA, as shown in figure 3 in series with the power on and protection 3.

To test the protective effect of block 4 of the protection of the CEA against pulse overvoltage proposed unit 5 modelling overload in the power supply circuits to the test equipment connected as shown in figure 4 - parallel to the power bus U2 and U0.

When checking availability and security settings block 3 (figure 3) on the control input unit 5 is fed to the input pulse, managed elements VT1 and VT2 are opened and chain "+U" - box 3 - VT2 - VT1 - "-U" runs a pulse of current Iz (shown by arrows with dashed line), simulating an overload. With increasing current overload Iz above the allowable unit 3 should work and disable the protected device 2.

The efficiency and the parameters of inclusion and protection 3 can be checked without device 2.

When checking availability and security settings block 4 (figure 4) on the control input unit 5 is udaetsya input pulse, managed elements VT1 and VT2 are opened and chain "+U" - L11 - VT2 - L12 - "-U" runs a pulse of current Iz simulating overload (shown by an arrow with a solid line). At the end of this pulse, due to the EMF of self-induction of the circuit overvoltage occurs, airwave protection device 4. In this case, the current Iz begins to flow through the circuit "+U" - L11 - block 4 - L12 - "-U", is shown by an arrow with a dashed line, and the voltage on the power bus begins to be limited. If this voltage corresponds to the specified voltage level security U4the protection unit 4 is operating normally. If this voltage is U5that means, the protection unit 4 either defective or requires configuration, and overvoltage impulses parries unit 5 on level U5.

The efficiency and the parameters of the protection unit 4 can be tested and without blocks 2 and 3.

The proposed set of features proposed by the author in the power system are not met previously to solve the problem and not obvious from the prior art, which allows to conclude that the technical solutions according to the criteria of "novelty" and "inventive step". As for the device can be used in standard Zener diodes, and as managed elements - powerful field-effect transistors for low-voltage circuits or TRANS is story type IGBT for high-voltage power supply systems. Can be applied and other managed elements.

Literature

1. Power supply CEA. The Handbook. Edited Gshively, M., 1985, s, the penultimate scheme in tabl.

Block modeling overload in a circuit contains two managed element, connected in series and forming a bipolar power output, two diodes, the first conclusions which are connected and form a control input, and the second terminals of the diodes are connected to control inputs of managed elements, two threshold stabilitron-resistor device, the Zener diodes which are connected with one pole of the power output, the resistor of the first threshold stabilitron-resistor device connected with the second pole of the power output and the resistor of the second threshold stabilitron-resistor device is connected to a common point connected in series managed elements, the outputs of the threshold stabilitron-resistor device connected to control inputs of managed elements.



 

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