RU183017U1 - Led indicator - Google Patents

Abstract

The proposed utility model relates to the field of information-measuring and computer engineering and can be used to display alphanumeric information. The technical result is to simplify the indicator and reduce power consumption. The technical result is achieved due to the fact that the indicator contains a transformer 1, a half-wave diode rectifier 2, a capacitor 3, the first 4 and second 5 sources of stabilized voltage, a variable resistor 6, n (where n ≥ 1 is the number of decimal places of a multi-bit indicator) of seven-segment indicators 7 - 8 on LEDs 9 with a common cathode connected to a common bus of the device, n information inputs 10-11, which are information inputs of n decoders 12-13 from a binary-decimal code to a seven-segment code, 7 × n keys 14. 2 ill.

Description

The proposed utility model relates to the field of information-measuring and computer engineering and can be used to display alphanumeric information.

A device for indicating [1], containing a reception register, a binary code decoder, decoupling diodes, a scale, keys, LEDs, limiting resistors, a power source, is known.

The disadvantage of the analogue is its complexity. The closest technical solution to the proposed one is the second embodiment of the LED indicator (options) ([2], the 2nd independent claim), the circuit of which contains n (where n ≥ 1 is the number of decimal places of the multi-digit indicator) of seven-segment indicators on LEDs with a common cathode, n decoders from the binary decimal code to a seven-segment code limiting the resistor, n information inputs, which are information inputs of the decoders, each output of which is connected respectively to the anodes of the LED in the respective seven-segment indicators combined decoders power terminals connected to the positive supply rail through a current limiting resistor.

The disadvantage of the prototype is its complexity due to the use of a limiting resistor, as well as the additional energy consumption of this resistor.

The technical problem solved by the utility model is to simplify the device and reduce power consumption.

This technical problem is solved due to the fact that the LED indicator containing n (where n ≥ 1 is the number of decimal places of the multi-digit indicator) has seven-segment indicators on LEDs with a common cathode connected to the device’s common bus, n information inputs, which are information inputs of n decoders from binary-decimal code into a seven-segment code, the power pins of which are interconnected and connected to the output “+” of the first stabilized voltage source, the inputs “+” and “-” of which are connected h capacitor and are connected respectively to the terminals “+” and “-” of a half-wave diode rectifier, the alternating voltage terminals of which are connected to the mains via a transformer, an additional variable resistor, a second stabilized voltage source and 7 × n keys are connected, the control inputs of which are connected respectively to the outputs of n decoders from the binary decimal code to the seven-segment code, the output “+” of the second stabilized voltage source is connected via keys to the anodes of the n seven-segment LEDs and cators outputs "+" and "-" of the second stabilized voltage source are interconnected through a variable resistor, the movable terminal of which is connected to the control input of the second stabilized voltage source, the input "+" is connected to the terminal "+" full-wave diode rectifier.

Significant differences of the proposed indicator are the introduction of additional elements (7 × n keys, a variable resistor and a second stabilized voltage source), as well as the exclusion of a limiting resistor from the circuit. These significant differences provide a positive effect - simplifying the device and reducing power consumption.

The indicator diagram is shown in FIG. 1. The indicator circuit (Fig. 1) contains a transformer 1, a half-wave diode rectifier 2, a capacitor 3, the first 4 and second 5 sources of stabilized voltage, a variable resistor 6, n (where n ≥ 1 is the number of decimal places of a multi-bit indicator) of seven-segment indicators 7 -8 on LEDs 9 with a common cathode connected to the device’s common bus, n information inputs 10-11, which are information inputs of n decoders 12-13 from a binary-decimal code to a seven-segment code, 7 × n keys 14, whose control inputs are connected respectively directly to the outputs of n decoders 12-13 from the binary-decimal code to a seven-segment code, the power leads of which are interconnected and connected to the output “+” of the first stabilized voltage source 4, the inputs “+” and “-” of which are connected via capacitor 3 and connected respectively to the terminals “+” and “-” of a half-wave diode rectifier 2, the AC voltage terminals of which are connected through the transformer 1 to the mains, the “+” output of the second stabilized voltage source 5 is connected via LEDs 14 to the anodes 9 n seven-segment indicators 7-8, outputs “+” and “-” of the second stabilized voltage source 5 are interconnected via a variable resistor 6, the movable output of which is connected to the control input of the second stabilized voltage source 5, the “+” input of which is connected to the conclusion "+" of a half-wave diode rectifier 2.

Consider the operation of the indicator (Fig. 1).

At the input terminals 10-11 of the indicator multidigit digital information is supplied in binary decimal code 8-4-2-1.

At the outputs of the decoders 12-13, the input information is converted from a binary-decimal code to a seven-segment code a-b-c-d-e-f-g in accordance with truth table 1 (see [3], p. 439, table 23.5).

Binary-decimal seven-segment decoders 12 - 13, produced in the form of integrated circuits (ICs) of type K514ID1 [4]) have outputs with a closed collector and are designed to control seven-segment indicators 7-8 on LEDs 9 with a common cathode.

When the unit voltage at the output of one of the decoders 12 -13, providing the operating current I _{p1 of the} LED, the corresponding LED goes into a radiating state.

When zero voltage is applied to the anode of the corresponding LED, the current does not flow through the LED, the LED does not emit, the segment is in a quenched state.

For example, when applying the numbers 456 to the inputs 10-11, the code “4” according to the table. 1 corresponds to the output code of the decoder 13 of the highest decimal place 0110011, which, in turn, corresponds to the emitting state of the segments b, c, f, g and the canceled state of the segments a, d, e. Segments a and d are the upper and lower segments, e - the lower left segment. Therefore, the decimal digit “4” is displayed on the indicator 8 of the highest digit, etc.

As a disadvantage of the K514ID1 type IC, it is worth noting the small limiting output current - the current through the segment, equal to 5.6 mA. This allows the use of the K514ID1 decoder only for controlling small-sized, low-power seven-segment indicators (for example, type AL113 ([5]).

To control more powerful seven-segment indicators with several LEDs connected in series (see Fig. 2) and high current through the keys, keys 14 are introduced into the indicator circuit.

Using a variable resistor 6, the output voltage level of the second stabilized voltage source 5 is set, which sets the required current through the LEDs 9 of the seven-segment indicators 7-8, which ensures the most acceptable brightness of the LEDs 9.

The advantage of the proposed indicator in comparison with analogues is its simplification, as well as a reduction in energy consumption by eliminating the limiting resistor from the indicator circuit.

Sources of information taken into account when drawing up the description of the application:

1. A. p. 318968 USSR, IPC G06K 15/18. Device for indication / Dolganov V.V., Kolomnin V.V. and Prizenko S.V. (THE USSR). - Declared. 03/26/70; Publ. 10/28/71, Bull. Number 32.

2. Patent for utility model 81364 RF, IPC G09G 3/14, G09G 3/32. LED indicator (options) - No. 2008134655/22; declared 08/25/2008; publ. 03/10/2009, bull. Number 7.

3. Titze U., Schenk K. Semiconductor circuitry: a reference guide. Per. with him. - M: World, 1982.

4. Nefedov A.V. Integrated circuits and their foreign analogues: Reference. At 12 vol. T. 4. - M .: KubK-a, 1997. - P.106 - 114.

5. Lisitsyn B.L. Low-voltage indicators: Reference.

Claims (1)

An LED indicator containing n (where n≥1 is the number of decimal places of a multi-bit indicator) of seven-segment indicators on LEDs with a common cathode connected to the device common bus, n information inputs, which are information inputs of n decoders from a binary-decimal code to a seven-segment code, outputs the power of which are interconnected and connected to the “+” output of the first stabilized voltage source, whose “+” and “-” inputs are connected through a capacitor and connected to the “+” and “-” terminals, respectively a half-wave diode rectifier, the alternating voltage terminals of which are connected through the transformer to the mains supply, characterized in that an alternating resistor, a second stabilized voltage source and 7 × n keys are added to it, the control inputs of which are connected respectively to the outputs of n decoders from the binary decimal code into the seven-segment code, the output “+” of the second source of stabilized voltage through the keys is connected to the anodes of the LEDs n seven-segment indicators, the outputs “+” and “-” of the second The stabilized voltage source is interconnected through a variable resistor, the movable output of which is connected to the control input of the second stabilized voltage source, the “+” input of which is connected to the “+” terminal of the half-wave diode rectifier.

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