RU84130U1 - DEVICE CONTROLLER FOR CONTROL OF ULTRA-LIGHT LEDS IN ACTIVE LIGHT HEADS - Google Patents

Abstract

A controller device for controlling superbright LEDs in active traffic light heads, comprising blocking means, an evaluation unit, a signal device including high-brightness light emitting diodes (LEDs) connected in series and controlled by direct current, characterized in that the device is made of functional units connected electrically and in accordance with the block diagram and consists of a block of light sources (LSI) containing superbright LEDs connected in series-parallel, an individual blocking circuit for dangling LEDs, a two-channel circuit for monitoring failed LEDs through optocouplers, connected to two BMK galvanically isolated channels, which in turn contains a two-channel microprocessor controller (BMK) unit containing two independent microcontroller sets with the function of mutual testing and comparison of received data, individual sets crystal oscillators for each microcontroller; a safe control and shutdown unit (BBCO), which contains a physical line disconnection circuit consisting of four independent sets, two for each power line for each microcontroller, diode bridge control circuit containing an analog-to-digital converter, and an input signal analysis circuit consisting of two cascades: triggering, generating a “saw” type signal with stable time and amplitude characteristics, and an adder performing the addition of signals from the triggering stage and the rectified input -stand voltage; a power supply unit (PSU) containing a protection device

Description

The claimed technical solution relates to the field of microelectronics and can be used in traffic light heads of traffic control systems.

Known technical solution for the patent No. 2248107 from 2000.11.03, HB 37/02, JP,

LED tube system has:

a unit for connecting to an AC power source,

a converter for forming a DC power source and an LED group consisting of a plurality of LEDs.

The LED group is equipped with a preliminary message unit service life, which includes a counting means for measuring the period of power supply based on the frequency of the AC power source,

integrating means for supplying power measured by the counting means and storing the integrated value in a non-volatile storage device; and means for controlling the power supply mode for controlling the LED illumination in various modes, including normal lighting modes.

The preliminary message block is designed to integrate the period of power supply for issuing a preliminary message indicating the approaching end of the service life.

The advantage is the presence of a preliminary service life block indicating the approaching end of the service life.

However, the system does not provide control over the health of circuit elements during device operation and the system locks in case of violations of the power supply mode, which excludes its use in traffic control devices.

The closest analogue is the technical solution according to patent EP 1777533 from 10.21.2005, G01R 31/26, HB05 33/08, DE,

A control device for a group of electrical units, preferably a group of high-brightness light emitting diodes (LEDs), connected in series and controlled by a well-known electric current,

including:

locking means, evaluation unit,

signaling device

including:

a group of lighting devices, in particular light emitting diodes (LEDs) of high brightness, connected in series; DC source, control device, control unit, specific mirror / lens system, signal device is used as a railway signal lamp.

The advantage is the presence of an individual lockout of blown LEDs, which allows the device to be used in traffic control systems in vehicles.

However, the device does not provide dynamic control of the elements of the blocking circuit, and involves the accumulation and masking of failures, reducing the time between failures, in critical traffic control devices

The purpose of the development of the proposed technical solution is to increase the reliability of devices to a failure rate of 10 ^-10 hour ^-1 , the safety of their use, the adaptability of use in relay or microprocessor-based traffic control systems.

The goal is achieved as follows.

The controller device for controlling superbright LEDs in active traffic light heads comprises a blocking device, an evaluation unit, a signal device including high-brightness light emitting diodes (LEDs) connected in series and controlled by direct electric current, while the device is made of functional blocks:

- a block of light sources (LSI), containing:

- superbright LEDs connected in series-parallel,

- scheme for individual blocking of dangling LEDs,

- a two-channel control circuit of failed LEDs through optocouplers connected to two BMK galvanically isolated channels.

- block two-channel microprocessor controller (BMK), containing:

- two independent sets of microcontrollers with the function of mutual testing and comparison of the received data,

- individual sets of crystal oscillators for each microcontroller.

- safe control and shutdown unit (BBCO), containing:

- a circuit for the physical opening of the line,

consisting of four independent sets, two for each power line for each microcontroller,

- a control circuit of diode bridges containing:

- analog-to-digital converter,

- input signal analysis circuit,

consisting of two cascades:

- triggering, generating a signal of the "saw" type with stable time and amplitude characteristics;

- an adder performing the addition of signals from the starting stage and the rectified input voltage.

- power supply unit (PSU) containing:

- surge protection device,

- two rectifiers,

- filter

- a device for switching on traffic light signal modes (“day”, “night”, “SDS”) with a stabilized LED power supply current,

- two power sources, providing a stabilized power supply of two microprocessor channels BMK.

- current stabilizers connected in series-parallel, which are controlled by a microprocessor controller.

In the presented drawing:

Figure 1 is a block diagram of a device where

1 - control device

2 - Power supply unit (PSU),

3 - Block two-channel microprocessor controller (BMK),

4 - Block light sources (LSI),

5 - Block of safe control and shutdown (BBKO).

The device operates as follows.

From control device 1, a signal arrives:

Signal head glow modes AC voltage, V DC voltage, V Day 10-15 10-15 Night 8-10 8-10 SDS 4-7.5 4-7.5 Thread Integrity Cold Control 0.5-3 0.5-3

The signal may be continuous and blinking.

1. The system is operational.

The signal enters block 2 (PSU). After passing through the anti-jamming devices and filters, it gets to two power sources that provide stabilized power to the two microprocessor channels of unit 3 (BMK) and two channels of unit 5 (BBCO), a safe shutdown circuit in case of failures.

Next, unit 3 (BMK) tests hardware and software, unit 2 (PSU) and light emitting diodes (LEDs), transmits signals for monitoring the operability of hardware and software of processors to unit 5 (BBCO), monitors the voltage level coming from external devices and turns on traffic signal “day”, “night”, “SDS”.

Next, block 4 (LSI) emits a luminous flux of a set color and a given light intensity set by block 3 (BMC). The color of the light flux is determined by the type of installed light emitting diodes (LEDs), which provide five primary colors of the signals: red, yellow, green, blue, moon white. The luminous intensity of the signal is determined by the number of light emitting diodes (LEDs) simultaneously switched on in each mode (“day”, “night”, “SDS”) and the current flowing through them. The signal enable modes (“day”, “night”, “SDS”) are set by block 3 (BMK) depending on the voltage level coming from the devices. Block 4 (LSI) is monitored and controlled by block 3 (BMC).

2. The system is malfunctioning.

If a different type of internal malfunction is detected, block 3 (BMC) makes a decision to switch to a safe, irrevocable state by disconnecting the device from power using block 5 (LSC).

Functioning algorithm

Receipt of input voltage in the power line (main or backup);

1. The input signal is rectified, filtered and turns on the microcontrollers.

2. The first test of microcontroller resources. In the event of a malfunction, a physical disconnection from the power line occurs.

3. Analysis of the input signal and making a decision on the need to turn on the LEDs (control signal or interference). The choice of the glow mode: "day"; "night"; "SDS".

4. Turning on the light sources. The start of the countdown.

5. Monitoring the health of the LEDs.

6. Monitoring the health of the physical disconnect circuit from the line.

7. Control circuit health diode bridges.

8. Analysis of the signal glow time (continuously burning or blinking signal - one second glow, half a second pause). If continuously burning - continuation of the algorithm. If blinking, go to the beginning of the algorithm.

9. Short-term shutdown of LEDs to control LED control circuits.

10. The second test of the resources of microcontrollers. In the event of a malfunction, physical disconnection from the power line.

11. Repeated implementation of paragraphs 4-11.

12. Turning off the power to the signal by the control devices.

If 30% of the LEDs fail, the main signal power line is turned off. Information about failed LEDs is recorded and stored in non-volatile memory of microcontrollers. In case of malfunctions of the remaining elements of the circuit, a physical disconnection from the power line occurs.

The claimed technical solution is industrially applicable and does not present difficulties for the current level of production.

The claimed technical solution is developed, tested and passed an examination for safety in the test center of railway automation-telemechanics of St. Petersburg State University of Railway Engineering.

In operating conditions, the signal can be in the on state for a long time, it becomes necessary to monitor the health of circuit elements. Control is carried out by the method of short-term removal of the supply voltage with an interval of one minute. The ability to control the health of circuit elements increases the reliability of the device.

The safety of the device is as follows. In the event of a breakdown or a break in the key in the secondary winding, there will be no signal, therefore there will be no power to the LEDs, which is fixed by the LED health monitoring circuit. In the event of a power failure on the LED, there will be no voltage, which is recorded by microprocessors.

By reducing the weight and dimensions of the device, the processability of application in relay or microprocessor-based traffic control systems is increased.

Claims (1)

A controller device for controlling superbright LEDs in active traffic light heads, comprising blocking means, an evaluation unit, a signal device including high-brightness light emitting diodes (LEDs) connected in series and controlled by direct current, characterized in that the device is made of functional units connected electrically and in accordance with the block diagram and consists of a block of light sources (LSI) containing superbright LEDs connected in series-parallel, an individual blocking circuit for dangling LEDs, a two-channel circuit for monitoring failed LEDs through optocouplers, connected to two BMK galvanically isolated channels, which in turn contains a two-channel microprocessor controller (BMK) unit containing two independent microcontroller sets with the function of mutual testing and comparison of received data, individual sets crystal oscillators for each microcontroller; a safe control and shutdown unit (BBCO), which contains a physical line disconnection circuit consisting of four independent sets, two for each power line for each microcontroller, diode bridge control circuit containing an analog-to-digital converter, and an input signal analysis circuit consisting of two cascades: a trigger that generates a “saw” signal with stable temporal and amplitude characteristics, and an adder that adds signals from the trigger cascade and the rectified input -stand voltage; a power supply unit (PSU) containing an overvoltage protection device, two rectifiers, a filter, a device for switching on traffic light signal modes ("day", "night", "SDS") with a stabilized LED power supply current, two power supplies that provide stabilized power to two microprocessor BMK channels, current stabilizers connected in series-parallel, which are controlled by a microprocessor controller.