FI89316C - ANORDNING FOER STYRNING AV TERMINALSTYRDON - Google Patents

Description

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DEVICE FOR CONTROLLING TERMINAL CONTROLLERS - ANORDNING FÖR STYRNING AV TERMINALSTYRDON

The present invention relates to a device for controlling terminal controllers according to the preamble of claim 5.

The terminal controllers of the control output used to control the electrical power supplied to the load (transistors, FETs, etc.) break when overloaded or short-circuited. A device for overload and short circuit protection is disclosed, for example, in U.S. Patent No. 4,695,915. the publication lacks a setpoint, in which case the overload current limit cannot be set to the desired value. In addition, as the load supply voltage varies, the current limit changes as the base current changes. The terminal transistor requires in the publication of a high control current. This results in large heat losses. In this case, it is practically impossible to integrate several outputs on the same integrated circuit. In addition, the coupling is not in the release, it occurs immediately when the control turns on 20, but requires a separate external pulse.

The object of the present invention is to obviate the above-mentioned drawbacks and to further provide a protection which does not require resistors in series with the load, which consume power and thus generate heat. Due to the resistors, it is not possible to integrate several protection units in the same housing due to thermal power losses. The device according to the invention for controlling terminal controllers is characterized by what is stated in the characterizing part of the appended claim.

.ALREADY

The invention achieves the significant advantage that even in the event of a short overload, the controller is completely closed, whereby heating is immediately prevented. In addition, the invention periodically examines the presence of an overload or short circuit with a very short pulse, and in order for reconnection to take place, the load current must be lower than in an overload situation. This arrangement ensures that 2 89316 overheating does not occur at any stage. This makes it possible to integrate several outputs, for example seven outputs, into one circuit. In addition, the connection can be controlled directly by a microprocessor. In addition, the same control can be made both feeding and swallowing.

The connection protects the terminal controller from all kinds of short circuits as well as from overload. There is virtually no way for the controller to heat up, which improves its reliability and prolongs its service life. No power resistors or any heating components are required for the connection. Thus, it is possible to make, for example, a microcircuit with eight controls, in which case no complicated housing solutions are required. Likewise, a pin compatible with the current commonly used circuit can be made, in which case short-circuit protection can be implemented by replacing the former with a new circuit.

In the following, the invention will be described in more detail by way of examples with reference to the accompanying drawings, in which

Figure 1a shows a block diagram of the short-circuit and overload protection of a source-type control output.

Fig. Ib shows a block diagram of the short-circuit and overload protection of a drain-type control output.

Figure 2 shows a source type overload and short circuit protection.

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Figure 3 shows a drain-type overload and short-circuit protection.

Figure 4 shows the operating cycles in the normal situation.

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Figure 5 shows the operating cycles in an overload or short circuit situation.

Let us first consider the source-type controller of the control output 5 (transistor, FET, etc.), which breaks when overloaded or short-circuited. Fig. 1a shows as a block diagram the operation of the overload and short-circuit protection of said controller. When the input is switched on, the control logic 1 'gives a short sensing pulse to the controller and at the same time examines the oi-10 obstruction and overload. If there is no short circuit or overload situation, the control logic gives the control required by the control reference value 2 'to the controller 3', and thus the switching takes place. However, if an overload or oi short-circuit situation is on, short-circuit and overload monitoring 15 4 'prevents continuous control of the controller. The oscillator 5 'handles the redirection after the overload or short circuit has disappeared. It monitors the duration of the overload / short circuit, periodically giving a short sensing pulse through the control logic to the controller, and when the short circuit / overload is no longer detected, the controller 20 is controlled to operate to match the input.

Figure 2 shows the control units of the source-type controller for the seven inputs II ... 17, of which Figure 2 shows the control units of the inputs II and 17. All oh-25 control units are similar in structure and operation, so only the input II control unit will be examined in the following. Input 17 has the last number 7 of the component reference marks when it is 1 in input II.

- 30 The emitter of a terminal controller consisting of a Darlington connection of two transistors Q31 and Q41 is connected to the supply voltage + Vcc and the collector to the output OI. In the terminal control circuit, the emitter of the first transistor Q1 is connected to the collector of the auxiliary transistor Q21, the collector -35 to the base of the second transistor Qli and the base to a first resistor R71 having a second terminal connected to supply voltage + Vcc and a second resistor R61 having a second terminal connected to the oscillator. for the collector of transistor Q50. Auxiliary transistor Q21 is connected via the emitter to the supply voltage + Vcc. Its emitter and base are connected via a third resistor R1. Input II is passed through a fourth resistor R21 to the base of the third transistor Q51. The emitter of the third transistor is connected to ground and the collector through a capacitor C1 to the base of the first transistor. The collector is further connected via the fifth resistor 10 R41 to the base of the auxiliary transistor and via the sixth resistor R31 to the base of the fourth transistor Q61. The emitter of the second transistor Q11 is connected to the collector of the auxiliary transistor, the base through the seventh resistor R11 to the output Oi and the collector to the base of the terminal controller and through the eighth resistor R51 to the emitter of the fourth transistor. The collector of the fourth transistor Q61 is connected in all controllers between the Zener diode D8, one pole of which is connected to the supply voltage + Vcc, and the ninth resistor RIO, the other pole of which is ground, which gives the reference value-20 voltage Vd.

The connection also has an oscillator common to all control units, which consists of a capacitor C2 and Schmitt triggers IC, over which a resistor R9 25 and a series connection of a diode D9 and a resistor R8 are connected. The amplifier is connected via resistor R50 to the base of transistor Q50. The emitter of transistor Q50 is connected to ground.

When the input II is raised above the threshold voltage, the third transistor Q51 starts to conduct, whereby the auxiliary transistor Q21 begins to conduct. In this case, through the capacitor C1, the first transistor Q1 is directed to conduct, whereby the signal coming to the base of the second transistor Q11 prevents it from conducting. Em. as a result of the functions, the fourth transistor Q61 starts to conduct 35, giving control to the terminal controller. Diode D8 forms a standard control section, preventing small supply voltage fluctuations 5 b 9 31 6 from affecting the output stage control. The second transistor Q11 and the seventh resistor R11 form an overload and short circuit monitoring circuit. When the voltage of the output signal OI drops, the second transistor Q11 switches to conducting, whereby the base of the terminal controller 5 starts to prevent the terminal controller from conducting. It, in turn, follows that the output 01 continues to decrease rapidly, and thus the control of the terminal controller ceases very quickly. The leakage current is blocked by the auxiliary transistor Q21, the third resistor R1 and the fifth resistor R41.

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The oscillator circuit, on the other hand, periodically gives a short pulse, which senses, for example, the duration of the short circuit. The oscillator controls the first transistor Q1 to conduct, thereby preventing the second transistor Q11 from conducting. 15 In this case, the terminal controller receives its control via the fourth transistor Q61. If the short circuit is removed, the voltage at output 01 will not drop, and thus the terminal controller will remain conductive. When the input II is directed down, the third transistor Q51 stops conducting, whereby the fourth transistor Q61 stops conducting. In this case, the base control of the terminal controller stops, closing the terminal controller.

Second, consider a drain-type control output controller (transistor, FET, etc.) that breaks when overloaded-2f * is measured or short-circuited. The overload and short-circuit protection is based here on the principle of Figure Ib, which fully corresponds to the principle shown in Figure 1a. The only difference is that the load in this case is on the supply voltage side when it is on the ground side in the source-type protection.

Figure 3 shows the control units of the drain-type controller for the seven inputs II '... 17' All control units are similar in structure and operation, whereby all controllers 55 have the same components. The components of the various inputs are denoted by reference numerals so that the last digit of the reference numeral corresponds to the input number. Let us examine the control unit of the input 11 'as an example.

5 Here too, the terminal controller consists of a Darlington connection of two transistors, Q31 'and Q41'. The collector of the first transistor Q1 'of the controller control circuit is connected to a first resistor R11', the second pole of which is connected to the output 01 ', and the second to the base of the transistor Q11', the emitter to the emitter of the second transistor Q11 'and the base to the input II'. The base of the controller and the collector of the second transistor Q11 'are connected via a second resistor R31' between a third resistor R100 'common to all controllers, the second terminal of which is connected to the supply voltage + Vcc', and the Zener diode D8 'connected to ground, from which the setpoint voltage Vd 'is obtained. In addition, a second diode D1 'is connected between the input II' and the second resistor R31 '. The base of the auxiliary transistor Q21 'is connected to the input via a fourth resistor R1', the collector supplied to the emitter of the transistor and the emitter together with the emitter of the controller to ground. The base of the first transistor Q1 'is further connected to the oscillator via a fifth resistor R21'.

The oscillator common to all control units has a capacitor C8 'and Schmitt triggers IC' connected to it, over which the series connection of the diode D9 'and the resistor R8' and the resistor R9 'are connected.

When the input II 'is raised, the first transistor Q1' is guided through the capacitor C1 ', which in turn causes the conduction of the second transistor Q11' to be prevented. In this case, the current flowing through the second resistor R31 'is directed to the base of the terminal controller. If the collector of the terminal controller 35 has a suitable load, then the collector voltage of the terminal controller drops below a certain voltage, and then the second transistor Q11 'is not controlled and the terminal controller remains in the conductive state. The auxiliary transistor Q21 'prevents, when the input is low, no leakage current 5 from the collector of the terminal controller enters the ground through the base of the first resistor R11' and the second transistor Q11 ', because the auxiliary transistor does not conduct.

If the collector of the terminal controller is short-circuited to the supply voltage, then at the end of the 10 short pulses directed to the base through the capacitor C1 ', the second transistor Q11' is switched on because it receives the base control from the collector of the terminal controller. This in turn causes the current coming through the second resistor R31 'to be directed to the ground through the second transistor Q11', whereby the terminal controller does not receive control, and it remains non-conductive.

Capacitor C1 'directs the output directly to the state required by the input without waiting for a pulse from the oscillator.

20 For example, in a short-circuit situation, the pulse coming from the oscillator at regular intervals examines the exit of the short-circuit. If the short circuit is still from the collector to the supply voltage, then the control applied to the terminal controller base will not cause its collector voltage to decrease sufficiently, and thus the terminal controller will remain: 25 non-conductive.

When the short circuit is removed, the pulse from the oscillator causes the collector voltage of the terminal controller to decrease, whereby the second transistor Q11 'does not receive control, and it enters the non-conductive -... 30 ground state. In this case, the current coming through the second resistor R31 'is directed to the base of the terminal controller, keeping it conductive.

If desired, the control is switched off and the input II 'is pulled down, whereby the current coming through the second resistor R31' does not go to the base of the terminal controller, and thus it ceases to conduct. Similarly, the pulse from the oscillator does not cause control to the terminal controller.

The Zener diode D8 'causes the base control to remain the same, even if the supply voltage Vcc' varies.

Fig. 4 shows the operating cycles in the normal situation, and Fig. 5 in the case of overload or short circuit at the points shown in Fig. Ib the input 1, the controller input 2, 10 the controller output 3 and the oscillator 4. The arrows indicate the course of events. The input normally controls the input of the controller and this further controls the output of the controller. In Figure 5, a short circuit or overload situation occurs at time 1 "and exits at time 2". During such a situation 15, the oscillator sends a pulse which is displayed at the input of the controller and thus at the output of the controller. When the situation is gone, the pulse given by the oscillator causes the situation to return to normal.

It will be apparent to those skilled in the art that the various embodiments of the invention are not limited to the examples set forth above, but may vary within the scope of the appended claims.

Claims (2)

9 89316 CLAIMS Device for controlling terminal controllers, the device having a control unit (1 ') for controlling each controller (3') with a setpoint (+ Vd; 5 from setpoint units (2 ') set independently of the external control (11-17; Il'-17'). + Vd '), short-circuit / overload unit (4') for detecting and removing short-circuit and overload situations, in which the semiconductor switch (Q11, Q11 ') in the short-circuit / overload unit is used to limit the current to the terminal controller , to which at least part of the control is controlled in the event of a short circuit or overload, and which short circuit / overload unit monitors the current of the terminal controller without a resistor connected in series with the terminal controller, and an oscillator (5 ') from which the control unit that the control unit has a first semiconductor switch (Q1, Q1 '), that the short-circuit / overload unit consists of a second semiconductor switch (Q11, Q11') and a resistor connected to its control electrode and the controller output (01-07,01'-07 ') ( R11, Rii ') that the first switch is connected to the control electrode of the second switch so that when the first switch is normally conductive it releases control to the terminal controller while preventing the second switch from conducting the second switch in a short circuit or overload situation by means of a control signal that the oscillator (5 ') emits sensing signals continuously, -30 that the control unit has constant voltage means (D8, D8') for keeping the control setpoint constant, and that the control unit has a capacitor (C1, Cl ') connected to the first switch control electrode responsible for external control an state without 35 controls from the oscillator. See J 9 31 6 1. Anordning styrning av ett antal terminalstyrdon, vil-ken anordning omfattar en styrenhet (1 *) för styrning av vart vart 5 och et av styrdonen (3 ') med hjälp av et frän en börvärdes-enhet (2') erhället börvärde ( + Vd; + Vd ') with an external signal at the end of the signal signal (II .., I7; I1' ... 17 '), with card slots / overflows (4') for detection and elimination of corkscrews- and overturned, 10-cell and / or short-circuited cells (Q11, Q11 ') are sometimes corroded or overturned by a styrene signal on the end-to-end genome of the field, which is the same as in the field. och vilken kortslutnings-15 / överlastenhet avkänner terminalstyrdonets Ström utan is not connected to a series of terminal terminals as well as to the oscillator (5 ') with an external detection signal with a signal to the busy styrene of the end of the night. in the case of spare parts, which can be used for a period of 20 hours or less (see Q1, Q1 '); .07,01 '... 07') to be replaced by a standard (Rll, Rll '), which may be connected to a total of 25 accounts with a fixed number of styrene electrodes at the end of the period according to the normal standard of the styrene electrode the signal at the terminal terminal and at the same time on the other side of the account, the signal at the end of 30 years at the end of the year on the other side of the account at the account of the account holder (s) to the account external detection signal, which can be used with a constant voltage element (D8, D8 ') up to 35 ter the minimum current is constant, and the styrene electrodes are connected to a low voltage styrene electrode with a capacitor (Cl, Cl ') in which the styrene terminal stays out to the external signal signal after the signal signal.