KR100617088B1 - Controller reset Apparatus - Google Patents

Abstract

The present invention relates to a control unit reset device capable of resetting a control unit to a normal state by solving an error occurring after an initial reset. The present invention is a power supply unit for supplying a DC voltage of a predetermined level, the controller is reset according to an externally input reset signal, the control unit for outputting a status signal for informing its operation state to the outside, according to the lamp enable signal (Enable) signal A switch for outputting or cutting off the DC voltage supplied from the power supply unit, a delay unit for delaying the DC voltage output from the switch for a predetermined time, and outputting a determination signal according to an external load operation detect signal and a state signal of the controller. A second switch for outputting or interrupting the DC voltage output from the power supply unit according to the signal determination unit for outputting the determination signal, the DC voltage output through the delay unit and the DC voltage output through the second switch; Control unit configured to include a reset circuit unit so that the control unit is reset by synthesizing the output to the control unit To provide Therefore, after initial reset, the controller detects an error due to noise and resets the controller to enable normal operation of the controller, thereby improving system reliability.

Control Unit / Reset / Lamp / Noise

Description

Controller reset device {Controller reset Apparatus}

1 is a block diagram showing the configuration of a controller reset device according to the prior art;

2 is a waveform diagram according to FIG.

3 is a block diagram showing the configuration of a controller reset device according to the present invention;

4 is a waveform diagram according to FIG.

5 is a circuit diagram illustrating an embodiment of FIG. 3.

* Description of the symbols for the main parts of the drawings *

11: power supply unit 21: control unit

22: expansion IC 23: signal determination unit

24: second switch 25: second delay unit

26: reset circuit

The present invention relates to a controller reset device for restoring a control unit to a normal operation state when an error occurs.

Currently, most electronic devices have a control unit including a microcomputer, a memory, and a signal input / output configuration for controlling the operation of the device.

The controller of such an electronic device requires a reset process during initial operation.

The video apparatus also includes the above-described control unit, which also requires a reset.

In particular, in the case of a digital lighting processing (DLP) type projector or a projection TV using a liquid crystal display (LCD) or a digital micro mirror device (DMD), light emission of the display element itself is impossible. Therefore, a lamp is used as the light source, which generates noise during initial startup of the lamp, which may adversely affect the operation of the controller. Therefore, a reset process for normalizing the control unit is essential.

Hereinafter, referring to FIGS. 1 and 2, a controller reset device applied to an image apparatus using a lamp will be described as an embodiment according to the related art.

As shown in FIG. 1, the control unit reset apparatus according to the related art includes a power supply unit 11 for power supply, a control unit 12 that operates using a DC voltage supplied from the power supply unit 11, and a lamp enable ( A switch 13 for outputting or cutting off the DC voltage supplied from the power supply unit 11 according to the Enable) signal, and a reset signal for delaying the DC voltage output from the switch 13 for a predetermined time to the controller 12. The delay unit 14 is configured.

Referring to the operation of the prior art configured as described above is as follows.

When the power of the device is 'on', the power supply unit 11 converts the commercial AC power to a DC voltage of a predetermined level and outputs it to the control unit 12 and the switch 13.

Subsequently, the switch 13 is 'on' according to the lamp enable signal to output the DC voltage input from the power supply unit 11 to the delay unit 14.

In addition, the delay unit 14 outputs a reset signal for delaying the DC voltage output from the switch 13 to the controller 12.

Therefore, the control part 12 is reset.

However, as shown in FIG. 2, when the lamp enable signal is applied, power is supplied to the lamp, and noise is generated due to a current applied during initial startup of the lamp.

Therefore, an error of the controller 12 may occur due to the generated noise, and thus may not be restored to normal.

As described above, the controller for resetting the controller according to the related art has a problem in that an error of the controller due to noise after reset cannot be solved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a control unit reset apparatus capable of restoring a control unit to a normal state by solving an error occurring after a reset.

In order to achieve the above object, the present invention is a power supply unit for supplying a DC voltage of a predetermined level, the controller is reset according to an externally input reset signal, and outputs a status signal for notifying the operation state of the outside, lamp enable A switch for outputting or cutting off the DC voltage supplied from the power supply unit according to an enable signal, a delay unit for delaying and outputting the DC voltage output from the switch for a predetermined time, an external load operation detect signal, and A signal determination unit for outputting a determination signal according to a status signal, a second switch for outputting or blocking a DC voltage output from the power supply unit according to the determination signal output of the signal determination unit, and a DC voltage output through the delay unit and the second switch; The DC circuit output through the switch is synthesized and output to the controller to reset the controller. It provides a control unit reset device configured to include. Therefore, after initial reset, the controller detects an error due to noise and resets the controller to enable normal operation of the controller, thereby improving system reliability.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

The same components as in the prior art are given the same names and the same reference numerals for convenience of description, and detailed description thereof will be omitted.

3 to 5, an embodiment of a controller reset device according to the present invention will be described.

As shown in FIG. 3, the controller reset apparatus according to the present invention includes a power supply unit 11, a switch 13, a delay unit 14, a control unit 21, an expansion IC 22, a signal determination unit 23, The second switch 24, the second delay unit 25, and the reset circuit unit 26 are configured to be included.

The power supply unit 11 supplies a DC voltage of a predetermined level to the switch 13, the control unit 21, and the second switch 24.

In this case, the DC voltage supplied from the power supply unit 11 may be the operating voltage level 5V of the controller 21.

The switch 13 outputs or cuts off the DC voltage supplied from the power supply unit 11 according to a lamp enable signal.

The delay unit 14 outputs to the controller 21 a reset signal obtained by delaying the DC voltage output from the switch 13 for a predetermined time.

The control unit 21 controls the entire device, is reset according to an externally input reset signal, and outputs a state signal for notifying its operation state to the outside through the expansion IC 22.

At this time, the status signal is a pulse type signal suitable for a predetermined timing.

The expansion IC 22 is connected to the spare port of the control unit 21 and receives and outputs a status signal from the control unit 21.

The signal determiner 23 receives a lamp detect signal and an output signal of the expansion IC 22, and turns on or off the second switch 24 according to the two signals.

At this time, the lamp detection signal is output from the lamp driving related configuration, and the lamp driving related configuration may be a ballast.

At this time, when the output of the extended IC 22 is recognized as an error in the controller 21 at the time when the lamp detection signal is determined to be operating normally, the signal determiner 23 turns on the second switch 24. Let's do it. Of course, when the output of the expansion IC 22 is also recognized as the normal operation of the controller 21 at the time when the lamp is determined to operate normally, the second switch 24 maintains the 'off' state.

When the second switch 24 is 'on' by the signal determination unit 23, the second switch 24 allows the DC voltage output from the power supply unit 11 to be input to the second delay unit 25.

The second delay unit 25 delays the DC voltage supplied through the second switch 24 for a predetermined time and outputs the delayed voltage to the reset circuit unit 26.

The reset circuit unit 26 synthesizes the DC voltage waveforms output from the delay unit 14 and the second delay unit 25 and outputs the synthesized DC voltage waveform to the controller 21 so that the controller 21 is reset.

The operation of the embodiment according to the present invention described above will be described with reference to the waveform diagram of FIG. 4 as follows.

First, the operation of the present invention in the case where the control unit 21 operates normally after the noise is generated is as follows.

The controller 21 causes the output of the expansion IC 22 to be at the 'high' level at the initial power supply.

Then, the control unit 21 changes the output of the expansion IC 22 from 'high' to 'low' before outputting the lamp enable signal through communication with the lamp driving related configuration, and then, for a predetermined time (for example, 3 seconds). ) And then change back to 'high'.

At this time, after the lamp enable signal is changed from 'low' to 'high' (ramp operation starts when the lamp enable signal is at 'high' level), the point at which the lamp detect signal changes from 'high' to 'low' is actually When the driving of the lamp is completed (normal operation start time of the lamp), for example, it may take 6 seconds. Therefore, the control unit 21 changes the output of the expansion IC 22 from 'low' to 'high' within less than 6 seconds (3 seconds) as described above.

Here, the control unit 21 changing the output of the expansion IC 22 from 'high' to 'low' and 'high' is to determine whether the control unit 21 is in normal operation. That is, since the output can be changed only when the controller 21 is normal, the output of the expansion IC 22 is changed as described above. If the output of the expansion IC 22 is kept unchanged, the output level of the previous expansion IC 22 can be maintained even after a failure of the control unit 21. In this case, it is impossible to determine whether the control unit 21 is abnormal.

The above-described extension IC 22 output is possible when the controller 21 operates normally without being affected by the noise generated after the lamp enable signal is changed to 'high'. Alternatively, the controller 21 may operate normally even when noise is not generated.

On the other hand, the switch 13 is 'on' according to the lamp enable signal and outputs the DC voltage input from the power supply unit 11 to the delay unit 14.

The delay unit 14 delays the DC voltage output from the switch 13 for a predetermined time and outputs the reset circuit unit 26 to the reset circuit unit 26.

Therefore, the reset circuit unit 26 outputs a reset signal corresponding to the DC voltage output from the delay unit 14 to the controller 21 so that the controller 21 is reset.

Subsequently, when the output of the expansion IC 22 is' high 'when the lamp detection signal is' low', the signal determination unit 23 maintains the second switch 24 in the 'off' state, and the lamp detection signal is' 'Low' when the output of the expansion IC 22 is 'low' is configured by a logic circuit or a software program to 'on' the second switch 24.

Therefore, when the control unit 21 operates normally, the output of the expansion IC 22 is 'high' when the lamp detection signal is 'low', so that the second switch 24 is kept in the 'off' state, and eventually the reset circuit unit Another reset signal is not output at (26).

Next, the operation of the present invention in the case where an error of the control unit 21 occurs after the noise is described as follows.

The controller 21 causes the output of the expansion IC 22 to be 'high' level after the initial power supply, and the output of the expansion IC 22 is 'high' before the lamp enable signal is output through communication with the lamp driving related configuration. Change from 'low' to 'low'

On the other hand, the switch 13 is 'on' according to the lamp enable signal and outputs the DC voltage input from the power supply unit 11 to the delay unit 14.

The delay unit 14 delays the DC voltage output from the switch 13 for a predetermined time and outputs the reset circuit unit 26 to the reset circuit unit 26.

Therefore, the reset circuit unit 26 outputs a reset signal corresponding to the DC voltage output from the delay unit 14 to the controller 21 so that the controller 21 is reset.

Meanwhile, the controller 21 should change the output of the expansion IC 22 from 'high' to 'low', and then change it back to 'high' after a predetermined time (for example, 3 seconds).

In this case, the above-described extension IC 22 output is possible when the controller 21 operates normally without being affected by noise after the lamp enable signal is changed to 'high'.

However, as shown in FIG. 4, when the controller 21 error occurs due to noise generated at the initial stage of driving the lamp, the controller 21 does not change the output of the expansion IC 22 from 'low' to 'high'. can not do it.

Thus, the expansion IC 22 output remains at the 'low' level even after the ramp detection signal is changed to 'low'.

Meanwhile, when the output of the expansion IC 22 is 'high' when the lamp detection signal is 'low', the signal determination unit 23 maintains the second switch 24 in the 'off' state, and the lamp detection signal is When the output of the expansion IC 22 is 'low' when the 'low', the logic circuit or a software program is configured to turn on the second switch 24.

Therefore, when an error occurs in the controller 21, when the lamp detection signal is 'low', the output of the expansion IC 22 is 'low', thereby switching the second switch 24 to the 'on' state.

Subsequently, the second switch 24 outputs the DC voltage to the second delay unit 25, and the DC voltage is delayed for a predetermined time through the second delay unit 25 and applied to the reset circuit unit 26.

4, the reset circuit unit 26 resets the control unit 21 by outputting another reset signal.

Therefore, the control unit 21 is reset to resume normal operation.

On the other hand, the actual circuit configuration example of the present invention described above is shown in FIG.

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

The controller reset apparatus according to the present invention as described above detects a controller error due to noise after performing a reset and resets the controller to enable normal operation of the controller, thereby improving system reliability.

Claims (6)

A power supply unit supplying a DC voltage of a predetermined level; A control unit which is reset according to an externally input reset signal and outputs a state signal for notifying its operation state to the outside; A switch for outputting or blocking a DC voltage supplied from the power supply unit according to a lamp enable signal; A delay unit for delaying and outputting the DC voltage output from the switch for a predetermined time; A signal determination unit configured to output a determination signal according to an external load operation detect signal and a state signal of the controller; A second switch outputting or blocking a DC voltage output from a power supply unit according to the determination signal output of the signal determination unit; And And a reset circuit unit configured to synthesize a DC voltage output through the delay unit and a DC voltage output through the second switch and output the synthesized circuit to the controller. The method of claim 1, And a status signal output from the controller is a pulse signal corresponding to a preset timing. The method of claim 2, And the pulse signal is a signal having a timing transitioned before the external load driving time and transitioned again before the external load operating time. The method of claim 1, And an expansion IC configured to expand the control unit output port to enable output of the state signal of the control unit. The method of claim 1, And the signal determiner is configured to turn on the switch when the state signal output from the controller is 'low' when the load operation detection signal is 'low' level. The method of claim 1, And a second delay unit configured to delay the DC voltage outputted to the reset circuit unit through the second switch for a predetermined time.

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