RU6951U1 - RADIO ELECTRONIC DEVICE PROTECTION DEVICE - Google Patents

Abstract

A device for protecting a radio electronic device, comprising two voltage limiters connected in series and opposite to each other and connected between conductors, through which the supply voltage to the electronic device is supplied, characterized in that it contains the first and second LEDs, the first and second diodes and the first and second resistors, a first resistor, a first diode and a first LED are connected in series and form a first LED circuit, a second resistor, a second diode and a second LED are connected in series they form a second LED circuit, both LED circuits being connected in series and connected to the conductors that supply voltage to the electronic device, the first LED and the first diode connected in accordance with each other, the second LED and second diode connected in accordance with each other, the LED chains are interconnected so that the first and second LEDs are turned on one against the other, and the connection point of the LED chains is connected to the connection point of the voltage limiters, the polarity of the terminals of the LEDs connected to the connection point of the LEDs are opposite to the polarity of the terminals of the voltage limiters connected to the connection point of the voltage limiters.

Description

Device for protecting an electronic device

The utility model relates to electrical engineering, and in particular, to devices

protection of electronic devices connected to AC power.

It is known that in an alternating current network with a voltage of 220 (127) volts, high-frequency overvoltages up to SOO V and more occur, short-term pulses with an amplitude of more than 1 kV are possible. These power surges, passing through a power source, can damage semiconductor devices and IC circuits or cause malfunctions in electronic devices.

In order to prevent voltages, special circuits are used with gas dischargers, all-fistors, and zener diodes. But all these devices have a large interelectrode capacitance, limiting their use at high frequencies (V.A. Kolosov, Power supply of stationary electronic equipment. Moscow, Tadio and Communications, 1992, p. 111).

Therefore, to protect electronic devices from high-frequency overvoltages in the power supply network, voltage limiters (restrictive diodes) are used, which have high-frequency (diodes) voltage limiters are crushed in case of applying voltage to them, which outperforms the voltage value of their breakdown. Device for protecting electronic devices from overvoltage in the network power supply using voltage limiters (prototype) is described, for example, in the reference book Electronic circuits to protect CEA from electrical overloads, authors V.P. Cherepanov, A.K. and I.P. Bludov, Moscow, Tadio and communication, 1994 (p. 42, Fig. 10.6).

Н02Н 9/02

The DSh1 device for supplying electronic circuits from short-circuit overvoltages to AC mains contains two voltage limiters, connected in series and opposite each other and connected between conductors, through which a supply voltage is supplied to the device. When an overvoltage appears in the network, one of the voltage limiters is in a conductive state, and the other one fails apart, while the overvoltage pulse is limited and does not lead to interference or malfunctions in the electronic device. Two limiters of the bottom bar, connected in series and opposite to each other, can be made in the form of another device - a symmetrical voltage limiter, or the connection point of the limiters is introduced.

However, if one of the voltage limiters fails (an open in it, for example, due to a short circuit due to a large current), the power supply to the device will not be disturbed, but 1 fiber will be deprived of surge protection. A malfunction in the protection device is thus not updated immediately and therefore is not eliminated. This undermines the reliability of electronic equipment.

The proposed utility model solves the technical problem of increasing the reliability of electronic equipment. In addition, more favorable operating conditions for electronic equipment are provided by reducing interference.

The essence of the claimed utility model lies in the fact that the device for protecting the electronic device contains two voltage limiters, connected in series with one another and opposite each other and connected between

conductors, through which the voltage is supplied to the electronic Ephibor (the following are the distinguishing features of the utility model), while it contains the first and second LEDs, the first and second diodes and the first and second resistors, the first resistor, the first diode and the first LED are connected in series and form the first LED circuit, the second resistor, the second diode and the second (the diode are connected in series and form the second LED circuit, 1 by both (the diode chains are connected in series and connected to to the conductors through which the voltage is supplied to the radio-electronic device, while the first LED and the first diode are switched on according to each other, the second LED and the second diode are connected according to each other, the LED circuits are interconnected so that the first and second (the same diodes are connected opposite to each other friend, and the connection point of the LED circuits is connected to the connection point of the voltage limiters, and the polarity of the terminals of the LEDs connected to the connection point of the LEDs are opposite to the polarity of the terminals ichiteley voltage ies connected to the junction of voltage limiters.

The proposed device for protecting the radio electronic device from short-term overvoltages in the AC power network is illustrated in the figure in figure I, which shows the device using two LEDs.

The list of symbols in the figure:

1- AC power supply

2 - radio-electronic device;

3- voltage limiter;

4- conductors for supply voltage

to electronic shchzhbor;

5- first year

6 - the first resistor;

7- first diode

8- second LED;

9- second resistor;

10- second diode

11- connection point of LED chains;

12- point of connection limit)

To fng. 1 shows a device dsh1 for protecting an electronic device 2 from short-term overvoltages in an AC power supply network 1. The ac supply voltage from the mains is supplied through conductors 4. Voltage limiters 3 are connected in series and counter to each other. They are connected between the conductors 4, through which the supply voltage to the electronic device 2.

The device for protecting the electronic device contains a first LED 5 and a second LED 8, a first resistor b and a second resistor 9, a first diode 7 and a second diode 10. The resistor 6, the first LED 5 and the first diode 7 are connected in series and form the first LED circuit. The second resistor 9, the second LED 8 and the second diode 10 are connected in series and form a second LED circuit. Both LED circuits are connected in series and connected to conductors 4. The first LED 5 and nqpBbiK diode 7 are turned on according to each other (i.e., the positive output of LED 3 with the negative output of diode 7). The second LED and the second diode 10 are also connected according to each other. The first and second LED chains

are connected in such a way that the first 5 and second 8 LEDs are turned on one against the other, and the connection point 11 of the LED circuits is connected to the connection point 12 of the voltage limiter. The polarity of the LEDs 5 and 8 half-connected to the point 11 of the input leads is opposite to the polarity of the voltage limiters 3 connected at the point 12 of the input 6 points.

The operation of the proposed device is described below.

The AC power supply voltage from the network 1 flows through the conductors 4 to the electronic device 2. During normal operation, the AC power supply, in the positive half-period of the mains voltage (on the upper wire 4 - plus), the upper voltage limiter 3, including the forward direction in this half-cycle, conducts current, and the second of the voltage guards 3 (lower), included counter to the upper one, is closed. The current passing through the upper voltage limiter 3 passes the second (lower) LED stick with a diode 10, LED 8 and resistor 9. During the negative half-wave of the mains voltage, the second (lower) voltage limiter 3 conducts current on the upper wire 4 times this current passes through the first (upper) LED circuit - the first diode 7, the first LED S n the first resistor b. LEDs 5 and 8 emit light, which indicates the absence of breaks in the current circuit inside the voltage limiters.

With a short-term voltage in the AC power supply network exceeding the permissible reverse voltage of voltage limiters 3, ODSH1 of them, included in the direct directional contact, conducts current, and the second, switched on counter to the first one, breaks briefly and thereby limits the overvoltage pulse in the network and does not pass it to the equipment.

If the power of the overvoltage pulse does not exceed the threshold power of the destruction of the voltage limiter, then the operation of the device then continues normally.

If the impulse power of the transferring voltage exceeds the threshold of destruction of the voltage limiter 3, then one of the voltage limiters 3 fails (for example, it burns). In this case, the current does not pass through the voltage limiter and one of the LEDs will not light. If the upper voltage and voltage limiter does not conduct current, then the second LED 8 stops illuminating. If the lower voltage limiter 3 fails, the first LED 5 ceases to light. The operating user receives information about the failure of OE by unloading voltage 3. Thus, Indication of the malfunction of the device of the day of protection of the electronic device and the operator (user) can take the necessary actions to replace the device for payment.

The inclusion of a sequence with LEDs S and 8 of diodes 7 and 10 makes it possible to use cheaper S and 8 LEDs with a small permissible reverse voltage in the protection device, for which diodes 7 and 10 must have a higher value of acceptable reverse voltage than the used LEDs.

From the point of view of industrial feasibility of the proposed device, oio can be manufactured using widespread elements. It does not require the development and introduction of special electro-radio elements. If necessary, the manufacture of the device lends itself to automation.

Structurally, it is advisable to place the device in a small hermetic sealed corne with subsequent pouring of radio elements, moreover, the case has two inputs and protruding luminous parts of the LEDs.

Claims (1)

A device for protecting a radio electronic device, comprising two voltage limiters connected in series and opposite to each other and connected between conductors, through which the supply voltage to the electronic device is supplied, characterized in that it contains the first and second LEDs, the first and second diodes and the first and second resistors, a first resistor, a first diode and a first LED are connected in series and form a first LED circuit, a second resistor, a second diode and a second LED are connected in series they form a second LED circuit, both LED circuits being connected in series and connected to conductors that supply voltage to the electronic device, with the first LED and the first diode turned on according to each other, the second LED and the second diode turned on according to each other, the LED chains are interconnected so that the first and second LEDs are turned on one against the other, and the connection point of the LED chains is connected to the connection point of the voltage limiters, the polarity of the terminals of the LEDs connected to the connection point of the LEDs are opposite to the polarity of the terminals of the voltage limiters connected to the connection point of the voltage limiters.