Biasing dc voltage combined protection

 

(57) Abstract:

Usage: in the power supply. The inventive voltage regulator combined protection, containing the control unit and connected in series in the power bus key regulatory element in parallel, which included the Zener diode, and a control unit connected with the control electrode of the regulating element, characterized in that it introduced an optocoupler, the light emitter through a limiting resistor connected in series with the Zener diode, the first phototransistor optocoupler emitter and base connected to the output pins connected in series with the regulating element of the current sensor, the collector of the first phototransistor of the optocoupler is connected to a control input of the regulating element and the output of the control unit, the second phototransistor optocoupler emitter connected to the control input of the key, and the collector through a current limiting resistor or restrictive Zener diode to a common bus. The technical result is a simplification of the stabilizer and extending its functionality. 2 C.p. f-crystals, 4 Il.

The invention relates to the field of electrical engineering and can be used in the sources of the elect, and protection against short circuits. In the stabilizer DC voltage [1] containing the sensor overload overvoltage Zener protection, regulatory element, consistently included in current bus, the master regulator in series with a Zener diode included the Executive element is a transistor protection.

A disadvantage of the known device is the lack of protection from overcurrent.

Closest to the proposed device to the technical essence is the stabilizer DC containing connected in series regulating element and the load, a control unit connected with the control input of the regulating element, which is parallel to the regulatory element is a thyristor with a first Zener diode in its anode circuit between the cathode of the thyristor and its control electrode included in the second Zener diode, and between the control electrode of the thyristor and the cathode of the first Zener diode is included a third Zener diode in the circuit to connect the load key is entered, the controlled input connected to the reference resistor [2].

The disadvantage of this device is its complexity and the lack of protection against overcurrent (saisie its functionality.

This goal is achieved by the fact that the device contains a voltage regulator combined protection, containing the control unit and connected in series in the power bus key regulatory element in parallel, which included the Zener diode, and a control unit connected with the control electrode of the regulating element, introduced the optocoupler, the light emitter through which a current limiting resistor connected in series with the Zener diode, the first phototransistor optocoupler emitter and base connected to the output pins connected in series with the regulating element of the current sensor, the collector of the first phototransistor of the optocoupler is connected to a control input of the regulating element and the output of the control unit, the second phototransistor optocoupler emitter connected to the control input of the key, and the collector through restrictive first additional resistor or restrictive additional Zener diode to a common bus.

In addition, it introduced an led, is connected in series with the Zener diode.

Entered the optocoupler, the light emitter which is connected in series with the Zener diode and the photodetector through the second additional limiting resistor p is certain the device is characterized by the presence of new units (for example, optocouplers) and their connections with other nodes and circuit elements. Thus, the claimed device is new, because it is unknown in the prior art.

A comparison of the claimed device and other technical solutions shows that the introduction of new nodes with the specified relationship with the other elements of the new properties, such as protection against overcurrent, fault indication. This allows us to conclude that the technical solution involves an inventive step, because for the authors it is not obvious from the prior art.

In Fig. 1 shows a diagram of the proposed device, Fig. 2 - output characteristic, Fig. 3, 4 - options.

The device comprises a regulating element 1 included in the power bus, a control unit 2 connected to the output with the control input of the regulating element 1, the inputs to the load 3; in series with the emitter of the regulating element 1 includes a current sensor 4, parallel to the regulating member 1 is included the Zener diode 5, the light emitter 6 of optocoupler 7, a current limiting resistor 8 and diode 9, parallel to the elements 6, 5, 9 switched capacitor 10, the emitter and base of the first phototransistor 11 is connected to the sensor is connected to the input key 13, included in the power bus, the collector element 12 is connected to the shared bus via an additional limiting resistor 14 and diode 15. Items 5, 6, 8, 9, 10 are parallel branch connected in parallel to the control element. 1 When performing key 13 on the thyristor (Fig. 3) its management is carried out through the elements 12, 16, 17 and diode 18 connected between the controlled input element 1 and the collector element 12, the emitter of which is connected to the shared bus. Instead of the element 9 may be equipped with a light emitter 19 triac optocoupler 20, the photodetector 22 which is enabled through a current limiting resistor 23 (Fig. 4).

The device shown in Fig. 1, operates as follows. In normal operation element 5 is in the closed state, the emitter 6 is de-energized, the photointerrupter 11 and 12 are closed, the key 13 is turned on and the stabilizer performs its basic functions. The Zener diode 5 is chosen from the condition that at the maximum input voltage and minimum load current it is not breaking, but if for any reason (excess input voltage, short circuit in the load) voltage regulating element 1 exceeds the nominal value, the Zener diode 5 is included in section proein current limitation (section AB in Fig. 2) and then an avalanche opens the item 1 (section CB). Opens and the phototransistor 12, begins to flow the current through the resistor 14, which may be designed in such a way that at a certain, but a valid UIthe key 13 is not turned off. Item 9 indicates that an alarm condition. For protection against high voltage input instead of the element 14 is set to the threshold element (for example, the additional stabilizer) 15. In this case, when reaching UIthe maximum value of the key 13 is activated, disconnecting the input voltage from the stabilizer. The capacitor 10 provides noise immunity of the device while switching transients.

When the execution key 13 in the form of a thyristor in normal operation, the thyristor 13 is turned on (the control current flows through the element 16), the diode 18 is closed, closed photointerrupter 11, 12. When any of the emergency operation (overvoltage on the regulating element, the current overload) open elements 11, 12, 18, thyristor 13 is closed. When connecting the point b to the point c 9 led indicates a fault, and the voltage at the element 1 is allocated to the elements 1 and 13.

If necessary, display the total alarm status is thus, the proposed device provides combined protection system with fault indication. The proposed data confirm the possibility of implementation of the invention.

Sources of information

1. A. S. USSR N 413470, G 05 F 1/58, BI 4, 1974.

2. A. S. USSR N 573803, G 05 F 1/58, B 35, 1977.

1. The voltage regulator combined protection, containing the control unit and connected in series in the power bus key regulatory element in parallel, which included the Zener diode, and a control unit connected with the control electrode of the regulating element, characterized in that it introduced an optocoupler, the light emitter through which a current limiting resistor connected in series with the Zener diode, the first phototransistor optocoupler emitter and base connected to the output pins connected in series with the regulating element of the current sensor, the collector of the first phototransistor of the optocoupler is connected to a control input of the regulating element and the output of the control unit, the second phototransistor optocoupler emitter connected to the control input of the key, and the collector through the first additional limiting resistor or additional restrictive Zener - it is consistent with the Zener diode.

3. The Zener diode under item 1, characterized in that it introduced the optocoupler, the light emitter which is connected in series with the Zener diode and the photodetector through the second additional limiting resistor connected to the source of the input voltage.

 

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