The method of controlling the vacuum fluorescent indicators and device for its implementation

 

(57) Abstract:

The invention relates to indicator technique and can be used in the application of vacuum fluorescent indicator (VLI) with directly heated cathode. The technical result of the invention consists in increasing the comfort of reading information from INFLUENCE by reducing the non-uniformity of illumination of the phosphor of the anode along the length of the cathodes. The essence of the invention: method of controlling vacuum fluorescent indicators, including the supply voltages on the control electrodes: mesh and coated with a phosphor anode, filament voltage fed to the cathode pulses from the source of DC power in the time intervals of cessation of current anodes, and displaying information carried out during the time between filament pulses, both the cathode output are close or equal potentials. In the control device, a vacuum fluorescent lights containing switches voltages of the control electrodes, the control conclusions which are connected with the block control signals, and supply conclusions - sources of DC power positive and negative polarity, have a common point, the cathodes of indicators seinen unit control signals, the first conclusion filament key connected to the first cathode output of the first indicator and the second output filament of the key - with a positive source of DC power, the second output of the last indicator is connected to a common point sources of power. 2 c. and 2 C.p. f-crystals, 1 Il.

The invention relates to indicator technique and can be used in the application of vacuum luminescene indicator (VLI) with directly heated cathode.

In the indicator technique known methods and devices for controlling vacuum luminescene indicators, in which the filament voltage of the cathode is supplied from a secondary winding of the transformer (Garfinkel B. I. and other Low-voltage cathodoluminescence indicators. M.: Radio and communication, 1983, S. 64). The average point of this winding is connected with the negative terminals of the source of DC power feeding the anode and grid and the positive clamp of the source of DC power for supply to the anode and grid of the blocking voltage.

However, at the specified technical solution cannot achieve high uniformity of illumination of the phosphor anode in time and along the length of the cathode, especially in the indicators set in the objects subjected to vibration>/P>Known technical solutions for pulsed heating tel glow under vacuum (Boguslavsky R. E., Severinsky N. With. Of the dynamic model of miniature incandescent lamps for optoelectronic devices. Semiconductor technology and microelectronics. 1981, vol. 33, S. 79-86).

However, in this technical solution is not used possible preservation emissivity of the body of the filament as the electron source in a vacuum luminescent indicator to maintain almost the same electric mode indicator electrodes when forming the image.

The closest analogue to the technical nature of the proposed solution prototype is a method of managing POWER and device for its implementation: vacuum fluorescent display stable brightness (U.S. patent N 4859912, CL G 09 G 3/10, publ. 29.08.89). Scheme brightness vacuum fluorescent display having anode, grid and filament electrode contains a unit for supplying alternating current to the filament electrode, resulting in the voltage of the cathode-anode and the brightness of the emitted light vary in time and space of the display scheme for aperiodic feed control pulses, RAZRUShENIYa thereby the brightness of the display and the unit coordinate resolution scheme glow with the magnitude of the filament current to run the control pulses or groups of control pulses at the sites of opposite phase, the filament current with a sufficiently high frequency, in order to obtain uniform brightness of the display.

The method of controlling INFLUENCE in U.S. patent N 4859912 is that the power to the filament of the cathode from the secondary winding to the middle point of the transformer is synchronized with the feed of the anode and grid of control signals. In each elementary time interval, the amount of which is formed an image on the display, there are the same number of periods of the AC filament voltage.

However, a significant disadvantage of this technical solution is that the current intensity causes varies along the length of the cathode fall voltage in different parts of the cathode relative to the midpoint of the secondary winding of the supply transformer connected to the sources of the anode and grid power.

For example, if the total current anodes and grids in each moment of time is much less than the filament current, when a rectangular pulse intensity amplitude Uand, measured from the middle point, the potential difference between points a cathode and a grid Ug,xwill be

< / BR>
where Eg- voltage power grids;

L is the length of the cathode;

x - distance of points of the cathode, measured from its CR is Ki cathode-anode leads to uneven illumination of luminophore anodes of the indicator, which increases when approaching the voltages of the power grids, anodes with filament voltage.

The invention consists in the following. The challenge which seeks the invention is to improve the comfort of reading information from a vacuum fluorescent indicators by reducing the non-uniformity of illumination of the phosphor of the anode along the length of the cathodes.

This technical result in the implementation of the invention is achieved in that in the known method of controlling vacuum fluorescent indicators, including the supply voltages on the control electrodes: mesh and coated with a phosphor anode, filament voltage fed to the cathode pulses from the source of DC power in the time intervals of cessation of anode current, the amplitude of the filament pulse UN. I.their durationandand the time between the filament pulse fromrelated ratios

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from< 2 MS,

where Ueff- the effective value of voltage intensity, and displaying information carried out in the time between the filament pulsefromwhile both cathodic export are close or equal potentials.

The decree is of the vacuum luminescene indicators containing switches voltages of the control electrodes, the control terminals of the switches connected to the block control signals, and supply conclusions - sources of DC power positive and negative polarity, have a common point, the cathodes of LEDs connected in a series circuit, a device was introduced filament key controlling the output of which is connected to the block control signals, the first output of the filament of the key is connected to the first cathode output of the first indicator and the second output filament key - on power source DC positive polarity, the second output of the last indicator is connected to a common point sources of power.

In addition, the control unit vacuum fluorescent indicatorname additional key controlling the output of which is connected to the block control signals, the first output of the additional key is connected to the first cathode output of the first indicator and the second output of the additional key from a common point sources of DC power.

In the control unit vacuum luminescene indicators can be entered diodes, the cathodes of which are connected with the first spacecraft the following indicators.

Used in vacuum fluorescent indicators directly heated cathodes are heated when applying filament voltage faster 0,6 - 0,8 MS than cool down when disconnecting the filament voltage 20 - 40 MS. The specific value of the specified time is determined by the length, weight, emissivity and mounting structure cathodes of different types of indicators. Therefore, when the time interval between the filament pulses less than 2 MS, the temperature of the cathode is almost constant. The temperature of the cathode of the LEDs is determined by the average dissipated power. Therefore, the amplitude of the filament pulse must be equal to the product of the effective values of the voltage by the square root of the duty cycle of the pulses, which is equivalent to the expression:

Intimacy or equality of the potentials of the terminals of the cathodes of the indicator is determined by the total value of the anode and grid currents and the resistance of the cathode at operating temperature. For example, when the sum of the currents of the anodes and grids of 10 mA and the resistance of the cathode 30 Ohms and connect the negative clip of the anode and grid power supply voltage 27 In only one output of the cathode, the maximum potential difference between the cathode is

The drawing shows a control device, a vacuum fluorescent lights.

The device comprises a first vacuum fluorescent indicator 1, the second vacuum fluorescent indicator 2, and so on, the last vacuum fluorescent indicator 3, with the anodes 4, grid 5 and filamentary cathodes 6. The anodes 4 and grid 5 is connected to the switch 7. The first supply pin 8 switch 7 is connected to a power source DC positive polarity 9, the second feeding pin 10 of the switch 7 is connected to a power source of direct current of negative polarity 11. Control outputs 12 of the switch 7 is connected to the unit control signals 13. The device comprises a filament key 14, upravlyaushiy output 15 which is connected to the block control signals 13. The first conclusion filament 16 key 14 is connected to the first cathode output 17 of the first indicator is 1, the second terminal filament 18 key 14 is connected to the power source DC positive polarity 9. The second cathode output 19 of the first led 1 is connected to the first cathode output 20 of the second indicator 2, and so on successively to the first cathode output 21 of the last indicator 3. The second cathode output 22 of posledstviya DC power negative polarity 11. The device also contains a key 24, the control pin 25 which is connected to the block control signals. The first output 26 of the key 24 is connected to the first cathode output 17 of the first led 1 and the cathodes 27, diode 28, the anodes 29 which are connected respectively with the first cathode output 20 of the second indicator 2, and so on, with the first cathode output 21 of the last indicator 3. The second conclusion 30 key 24 is connected to a common point 23.

The device operates as follows.

First is preheated cathodes 6 indicators 1, 2, 3 during the timep. Why block control signals 13 delivers such voltage switches voltage 7, the filament of the key 14 and key 24, which is connected to the grid 5 (anodes 4) to the negative power source 11, completing the first cathode output 17 of the first indicator 1 power source DC positive polarity 9, and the key 24 unlock.

Further, upon completion of the warm-up timepthere comes a time displayfrom. Why block control signals 13 gives such power to the switches 7, which correspond to the currently displayed information, closing the anodes 4 and grid 5 with a source of DC power positive p is th key 14 and closes the key 24. Current anodes 4 and grid 5 indicators 1, 2, 3 in this case, flow in parallel through the first cathode output 17, the key 24 at a common point 23 through the cathode conclusions 19, 20, 21, the diodes 28 and the key 24 at a common point 23 through the second cathode output 22 of the last indicator 3 common point 23. At the end of time displayfromrepeated the process a preheating of the cathodes 6 indicators 1, 2, 3, and so on warm-up Time between pulses of the cathodes 6 should be less than 2 MS, duty cycle Qnand their amplitude UI. p.connected by the relation:

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or

< / BR>
where UAFUAF, ..., Ueff- the effective value of the voltage of the glow cathodes 6 indicators 1, 2, 3, in the sequential chain.

Naturally, in a sequential chain of cathodes 6 indicators 1, 2, 3 with the same current intensity.

If the indicators have different currents of heat, it is necessary combinations of parallel connections of the cathodes 6, using, if necessary, additional external load, to achieve the same current of each successive link in the filament circuit.

Made according to the scheme described device control two indicators type IL-16/5X7, having an effective filament voltage and 6B and the length of the cathodes image in the whole range of HR frequency from 40 Hz to 10 kHz.

Thus, the separation in time of the processes of heating the cathodes of the LEDs and display information in sufficient alignment of the potentials of the cathodes is achieved by reduction of the uneven illumination of the phosphor anode vacuum fluorescent indicators with directly heated cathodes both in time and along the length of the cathode.

The use of the proposed technical solutions way management vacuum fluorescent indicators and device for its implementation allow to improve the comfort of the reading information by reducing the non-uniformity of illumination of the phosphor anode as the length of the cathode, and in time, and also use in some specific implementations as a source of filament voltage source DC power intended to supply the anodes, which reduces the dimensions of the indicator device.

1. The method of controlling the vacuum fluorescent indicators, including the supply voltages on the control electrodes, characterized in that the filament voltage is fed to the cathode pulses from the source of DC power in the time intervals of cessation of current anodes, the amplitude of the filament pulse UN. HR>from< 2 MS,

where Ueff- the effective value of voltage of the glow,

and displaying information carried out in the time between the filament pulsefromwhile both cathode output are close or equal potentials.

2. The control unit vacuum fluorescent lights containing connected to the anodes and grids of the indicators switches, the first supply conclusions which are connected to a power source DC positive polarity, the second supply terminals of the switches connected to the power source of direct current of negative polarity, and the control terminals of the switches connected to the unit control signals, power supplies, direct current positive and negative polarity have a common point, wherein the cathodes of the LEDs are connected in series circuit, a device was introduced filament key controlling the output of which is connected to the block control signals, the first conclusion filament key connected to the first cathode output of the first indicator and the second output filament key - on power source DC positive polarity, the second output of the last indicator">

3. The device according to p. 2, characterized in that it introduced an extra key that controls the output of which is connected to the block control signals, the first output of the additional key is connected to the first cathode output of the first indicator and the second output of the additional key from a common point sources of DC power.

4. The device under item 2 or 3, characterized in that it introduced the diodes, the cathodes of which are connected with the first cathode output of the first indicator and the anodes of which are respectively with the first cathode pins of the second and subsequent indicators.

 

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