JP3297967B2 - Electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic apparatus having a plurality of microcomputers , and is suitable for preventing a malfunction of a microcomputer at the moment of a commercial power failure.
It is something.

[0002]

2. Description of the Related Art In a recent electronic device such as a television receiver, for example, a main microcomputer (hereinafter, referred to as a main microcomputer) for controlling the whole according to a model and a plurality of sub-controllers for controlling individual operations such as additional functions. Some microcomputers are provided with a microcomputer (hereinafter referred to as a sub-microcomputer) for control.

FIG. 4 is a block diagram showing a configuration of a power supply related to a microcomputer (hereinafter referred to as a microcomputer) of a television receiver as an example. In this figure, reference numeral 1 denotes a main power supply circuit unit (not shown) for supplying a predetermined voltage to each circuit unit constituting the television receiver, and 2 denotes an on / off state of the television receiver.
This is a standby power supply circuit section that is supplied with commercial power regardless of the OFF operation and supplies a predetermined operating voltage to the microcomputer.

[0004] Reference numeral 3 denotes a memory unit for storing information necessary for controlling each unit. Reference numeral 4 denotes a control bus CB (not shown) based on the operation of a remote controller (not shown) or a key operation provided on the apparatus main body. It is a main microcomputer that controls the entire device via I ² C ). 4a-4n
Reference numeral denotes a sub-microcomputer which controls, for example, three to five or more provided individual functional circuits depending on the model. Reference numeral 5 denotes a reset circuit for resetting the main microcomputer 4, and reference numerals 5a to 5n denote reset circuit units for resetting the sub-microcomputers 4a to 4n when the power is turned on.

[0005] Reference numerals 6a to 6n denote readable and writable random access memories (hereinafter referred to as RAMs).
The information of each functional circuit unit stored in the control bus CB, for example, the adjustment value of the image set by the user, etc.
And input via the sub-microcomputers 4a to 4n. S
A switch, which is turned on / off by the main microcomputer 4 by a key operation provided on a remote controller (not shown) or a device body (not shown).

When the microcomputer is configured to supply an operating voltage from the standby power supply circuit unit 2 to the main microcomputer 4 and the sub-microcomputers 4a to 4n as shown in FIG. 4, the television receiver is turned off, That is, even when the switch S is off, the main microcomputer 4 and the sub-microcomputers 4a to 4n are always connected via the standby power supply circuit 2.
Is supplied with the operating voltage.

For this reason, when the additional functions increase depending on the model, the number of sub-microcomputers controlling the additional function section also increases, and the current flowing when the power of the device is turned off (hereinafter referred to as standby current) increases, resulting in wasted power. The problem of consuming is generated.

Thus, there is a configuration example of a microcomputer for suppressing an increase in standby current when the power is turned off as shown in FIG. In this figure, 1a denotes a regulator circuit for converting the voltage supplied from the main power supply circuit 1 to a predetermined voltage V _R (REG), the main power supply circuit section 1
Although not shown, a predetermined voltage is supplied to each circuit unit constituting the television receiver, and a voltage is supplied to the regulator circuit unit 1a.
Further, the standby power supply circuit section 2 supplies a predetermined operating voltage V _S only to the main microcomputer 4. Others are the same as those in FIG. 4 described above, and the description is omitted.

[0009] As shown in this figure, so as to supply the operating voltage V _S only the main microcomputer 4 from standby power supply circuit unit 2, the regulator circuit section 1a to each sub-microcomputer 4a~4n from the main power supply circuit section 1 when configured to supply operating voltage V _R through, when the television receiver is off, the switch S is also the voltage on the main power supply circuit 1 is off is not supplied, the standby power supply circuit unit 2, the operating voltage V _S is supplied only to the main microcomputer 4. Therefore, the standby current is configured to be only the current consumed by the main microcomputer 4 even when the additional functions increase depending on the model.

[0010]

By the way, in some foreign countries, such as the United States and Southeast Asia, there is a momentary power failure (for example, a phenomenon in which a commercial power failure occurs momentarily for a few seconds).
Can often occur. When a normal long-time power failure occurs, the voltage of the power supplied to both the main power supply circuit unit 1 and the standby power supply circuit unit 2 disappears, and all the microcomputers are in a system down state. And
For example, when the main microcomputer 4 is started when the power is restored, the initial setting data stored in the memory unit 3 is stored in the control bus CB by the start program of the main microcomputer 4.
Is supplied to each of the sub-microcomputers 4a to 4n, and the data is stored in the RAMs 6a to 6n of the sub-microcomputers 4a to 4n.
Is controlled to be stored.

As a result, after recovery from the power failure, the television receiver loses some user setting data, but standard data is temporarily supplied to the sub-microcomputers 4a to 4n for other control data. Has been made to work almost normally.

However, when an instantaneous power failure occurs, if the microcomputer is configured as shown in FIG. 5, only the voltage of the main power supply circuit unit 1 may be extinguished earlier in some cases. This is because the standby power supply circuit unit 2 and the main power supply circuit unit 1 are normally charged up by capacitors (not shown) added to the respective units. This is because the load (each circuit unit) connected to the main power supply circuit unit 1 is heavier than the main microcomputer 4), so that the charge-up voltage of the main power supply circuit unit 1 disappears first.

Accordingly, the operating voltage of each of the sub-microcomputers 4a to 4n is extinguished even by an instantaneous power failure, and image information such as white balance, convergence, and linearity stored in the RAMs 6a to 6n added thereto is extinguished. May be done.

Therefore, in the case of an instantaneous power failure, the main microcomputer 4 remains in the standby power supply circuit section despite the fact that the charge-up voltage of the main power supply circuit section 1 has disappeared and the operation of each of the sub-microcomputers 4a to 4n has stopped. In some cases, normal operation is performed with the charge-up voltage of 2. At this time, even if the power is restored and the sub-microcomputers 4a to 4n are in operation, the main microcomputer 4 keeps the sub-microcomputers 4a to 4n.
Since the control for transmitting the initial setting data from the memory unit 3 is not performed, there is a problem that an image displayed on the screen remains largely disturbed, for example.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in order to solve this problem, the standby power supply (static
Power supply circuit section), and the overall
Control means (main microcomputer) that performs various controls
And the main power supply (main power supply circuit section)
The initial setting information of the electronic device obtained from the main control means
Sub-control means (sub-macro) for controlling predetermined functions of the electronic device.
Micro computer) and commercial power supplied to electronic devices.
Detection means for detecting a momentary interruption of the power source, and a standby power supply (standby
B) a power supply circuit for branching and supplying the sub-control means
To the power line
Switch means for turning on / off. And Sui
The switch means is turned off when a momentary interruption is detected by the detection means.
Control so that

[0016]

According to the electronic device of the present invention, the instantaneous interruption of the commercial power supply
When the sub control means (sub microcomputer)
Main control means (main microcomputer)
The standby power supply that is supplied to the
Operating voltages supplied to the main control means and the sub control means.
Can be expected.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a microcomputer control device according to the present invention, which is used in a television receiver or the like, will be described below. FIG. 1 is a block diagram in the case where the microcomputer control device of the present embodiment is applied to a television receiver. In this figure, reference numeral 11 denotes a PLL tuner that selects a reception radio wave of UHF / VHF broadcast received by an antenna, and 12 denotes a PL tuner.
A switching unit that switches between a reception signal output from the L tuner 11 and an external input signal (not shown) input from outside.

A block surrounded by a chain line 13 is a video signal processing unit, and 13a is an analog / digital converter for converting an analog video signal output from the input switching unit 12 into a digital video signal. Reference numeral 13b denotes a luminance signal processing unit that extracts a luminance signal from the digitally converted video signal using, for example, a comb filter, and 13c denotes a color signal processing unit that extracts only a color component from the digitally converted video signal. A digital / analog converter 13d converts a digital luminance signal and a color signal into an analog luminance signal and a color signal. M1 is a video signal processing unit 13
Sub-microcomputer that performs various controls.

Reference numeral 14 denotes a matrix circuit for converting an analog color signal and a luminance signal output from the digital / analog converter 13d into predetermined three primary color signals. Reference numeral 15 denotes a predetermined RGB signal output from the matrix circuit 14. And a CRT 16 for displaying an image based on RGB signals output from the drive circuit 15.

Reference numeral 17 denotes an audio IF for amplifying / detecting an intermediate frequency (IF) signal of the audio output from the input switching unit 12.
An amplification / detection unit 18 is an audio IF amplification / detection unit 17
Is an audio signal processing unit (audio processor) that performs a predetermined process on the audio signal detected by. 19 is an amplifier unit for amplifying the audio signal output from the audio signal processing unit 18,
Reference numeral 20 denotes a speaker that outputs the audio signal amplified by the amplifier unit 19 as audio.

A block surrounded by a chain line 21 is a synchronization circuit section, and a synchronization separation circuit section 21a extracts vertical and horizontal synchronization signals from a digital video signal. 21
b is a P that outputs a predetermined frequency to the synchronization separation circuit 21a.
An oscillator constituted by an LL circuit, a reference numeral 21c denotes a horizontal synchronization processing unit for performing predetermined processing on a horizontal synchronization signal output from the synchronization separation circuit unit 21a, and a reference numeral 21d denotes a synchronization separation circuit unit 2
This is a vertical synchronization processing unit that performs a predetermined process on the vertical synchronization signal output from 1a. M2 is a sub-microcomputer that performs various controls of the synchronous circuit section 21.

Reference numeral 22 denotes a horizontal deflection circuit for outputting a horizontal deflection current in response to a horizontal synchronization signal output from the horizontal synchronization processor 21c. Reference numeral 23 denotes a vertical deflection current in accordance with a vertical synchronization signal output from the vertical synchronization processor 21d. A vertical deflection circuit unit 24 is added to a cathode ray tube that deflects the RGB signals output from the drive circuit 15 by the horizontal and vertical currents output from the horizontal deflection circuit unit 22 and the vertical deflection circuit unit 23. Horizontal and vertical deflection coil units.

A block surrounded by a chain line 25 indicates the configuration of an additional function circuit unit such as a two-screen television, and a reference numeral 25a denotes a video signal processing unit which processes a video signal received by the PLL tuner 11. 25b converts an analog signal output from the video signal processing unit 25a into a digital signal and outputs the digital signal to a memory 25c described later,
A digital signal processing unit which converts a digital signal stored in the memory 25c into an analog signal and outputs the analog signal to the matrix circuit 14, and 25c is a digital signal processing unit 25b
And a field memory unit for processing the luminance signal and the chrominance signal that have been converted into digital signals. M3 is a sub-microcomputer that performs various controls of the additional function circuit unit 25.

[0024] 31 voltage detection unit for detecting a power failure of the commercial power supply, 32 denotes a main power supply circuit section for supplying an operating voltage V _B to each circuit unit converts the AC voltage to a predetermined DC voltage, 33 Voltage V supplied from main power supply circuit 32
The _B is a regulator circuit which converts the operating voltage V _M (e.g. 5V) for each sub-microcomputer.

Reference numeral 34 denotes a standby power supply circuit section to which an AC voltage from a commercial power supply is constantly supplied, which converts the AC voltage into a predetermined DC voltage and outputs it.
M is a main unit that performs overall control based on, for example, an operation of a remote controller (not shown) operating at a predetermined voltage (for example, 5 V) output from the standby power supply circuit unit 34 or a key operation provided on the device body. It is a microcomputer.
Reference numeral 35 denotes, for example, a display unit provided on the front surface of the device for displaying various control states, and reference numeral 36 denotes a switch unit which will be described later and operates when a power failure occurs. S is a switch that is turned on / off by the main microcomputer M.

Next, the operation of the main microcomputer and the sub-microcomputer by the power ON / OFF operation of the television receiver of the embodiment will be briefly described with reference to the timing waveform chart shown in FIG. Normally, the television receiver is supplied with AC 100 V from a commercial power supply as shown in FIG. 2A, and the voltage is supplied to the standby power supply circuit section 34 even when the television receiver is off. ing. Therefore, a predetermined voltage V _S (for example, 5 V) as shown in FIG. 2B is output from the standby power supply circuit unit 34,
It is supplied to the main microcomputer M. Thus, the main microcomputer M is prepared for the operation of the timer function and for input from a remote controller (not shown).

When a power-on signal is input to the main microcomputer M by a key operation or the like provided on a remote controller (not shown) or the main body of the apparatus, the main microcomputer M connects the switch S and Power supply circuit 3
2 is controlled to supply the voltage of the commercial power supply.

As a result, a predetermined operating voltage and a regulator circuit 33
2 supplies a predetermined voltage V _R (for example, 5 V) as shown in FIG. 2D to each of the sub-microcomputers M1 to M3. Each sub-microcomputer M1~M3 than the rise of the operating voltage V _R supplied as shown in (C) of FIG. 2, at a predetermined timing slightly delayed, stored in a memory unit (not shown) by the main microcomputer M Initial data
(DATA0), setting data (DATA1), and the like are transmitted via a Philips bus interface (I ² C) formed of, for example, two lines.

Also, for example, a remote controller (not shown)
When a power-off signal is input to the main microcomputer M by key operation or the like, the main microcomputer M
Is turned off so that the supply of commercial power to the main power supply circuit section 32 is stopped. Therefore, the supply of voltage to each circuit unit is stopped, and the television receiver is turned off.

Next, the operation when an instantaneous power failure occurs is shown in FIG.
This will be described with reference to an example of a specific circuit of the switch circuit section 36 shown in FIG. In this figure, R _{1 to} R ₃ are resistors, C
A capacitor, Q ₁ denotes a switching element by an NPN transistor, a switching element by Q ₂ is a PNP transistor, D a diode. Terminal A is shown in FIG.
Is connected to the output voltage V _S from the standby power supply circuit portion 34 shown in, the terminal B is connected to the main microcomputer M, the terminal C is the output voltage V _R of the regulator circuit 33 parts
, Respectively.

First, for example, when an instantaneous power failure as shown in FIG. 2A occurs, the power failure is detected by the detection circuit 31 and a detection signal S of, for example, an HI voltage as shown in FIG. Output to the main microcomputer M. By the detection signal S, the main microcomputer M causes the terminal B shown in FIG.
Is applied with the HI voltage.

As a result, the switching elements Q ₁ and Q ₂ are turned on, and the terminals A and C are connected by the diode D. That is, the output voltages of the standby power supply circuit section 34 and the regulator circuit section 33 shown in FIG.

On the other hand, normally, the main power supply circuit section 32 and the standby power supply circuit section 34 are charged up by a capacitor (not shown) added to each circuit section. Is supplied to each circuit unit, but the load (each circuit unit) connected to the main power supply circuit unit 32 is heavier than the load (the main microcomputer M) connected to the standby power supply circuit unit 34. Therefore, the main power supply circuit section 3
The charge-up voltage of No. 2 falls earlier than the charge-up voltage of the standby power supply circuit unit 34.

Therefore, during a power failure, the main power supply circuit 32
The output voltage V _R of the regulator circuit section 33 to which the voltage is supplied from is output as shown by the dashed line in FIG. 2D, and is indicated by the dashed line in FIG. 2B output from the standby power supply circuit section. decrease of voltage is fast with respect to the charge-up voltage V _S. That is, the terminal C shown in FIG.
Will drop earlier.

However, when the voltage V _{R at the} terminal C (the voltage of the regulator circuit section 33) becomes lower than a predetermined value with respect to the voltage V _{S of the} terminal A (the voltage of the standby power supply circuit section 34), the diode D becomes conductive. The voltage V _{S at the} terminal A is supplied to the terminal C.

That is, when a power failure occurs, the sub microcomputer M
When the output voltage V _R from the regulator circuit 33 supplied to the sub-microcomputers M1 to M3 falls below a predetermined value, the charge-up voltage V _S of the standby power supply circuit 34 supplied to the main microcomputer M becomes lower than the sub-microcomputer M1. To M3.

[0037] Therefore, even if the charge-up voltage of the main power supply circuit portion 32 disappears, so that the charge-up voltage V _S of the standby power supply circuit 34 is supplied as an operating voltage to the sub microcomputer M1 to M3. Charge-up voltage V _S of the standby power supply circuit unit 34, if the instantaneous power failure (power failure for about 2 to 3 seconds), the main microcomputer M as shown by the solid line in FIG. 2 (b), and (d), In addition, the operation voltages of the sub-microcomputers M1 to M3 can be sufficiently satisfied, and the microcomputers can operate normally after the recovery from the momentary power failure.

Further, at the time of the recovery from the instantaneous power failure, the voltage of the commercial power supply is detected by the detection circuit section 31, and the detection signal S is changed from the HI voltage to the LO voltage (0) as shown in FIG.
V) and output to the main microcomputer M. The detection signal S causes the voltage applied from the main microcomputer M to the terminal B shown in FIG.
The voltage is inverted to the O voltage (0 V), and the switching elements Q ₁ and Q ₂ are turned off again. Thus, the main power supply circuit section 32 and the standby power supply circuit section 34 are separated again.

Further, if the power failure is for example more than 5-6 seconds relatively long, and reduced charge-up voltage V _S which is added to the standby power supply circuit unit 34, the voltage is the operating voltage supplied to the microcomputers In the following, the main microcomputer M and the sub-microcomputers M1 to M3 stop operating synchronously.

Therefore, after a relatively long power recovery from the power failure, the startup program of the main microcomputer M starts up, the initial setting data is transmitted to each of the sub-microcomputers M1 to M3, and the television receiver operates almost normally. .

When the operating voltage of the main microcomputer M is substantially equal to the operating voltage of the sub-microcomputers M1 to M3, FIG.
May be deleted. Although the detection signal S of the detection circuit unit 31 is output to the main microcomputer 4, the detection signal S may be output directly to the terminal B of the switch circuit unit 36.

[0042]

As described above, according to the electronic apparatus of the present invention, when the commercial power supply is momentarily interrupted, the sub control means (sub micro
Computer), the main control hand through the switch means
Standby power supplied to the stage (main microcomputer)
Are branched and supplied, so that the main control means and the sub-control means
The operating voltage supplied to the power supply can be synchronized
become. Therefore, even if instantaneous interruption of commercial power
The operation can be performed continuously. During normal operation, the main power supply (main power supply circuit) and standby power supply
(Standby power supply circuit) separated by switch means
It is the main control means (main microcomputer) during standby
Power supply during standby, power consumption during standby
There is also the advantage that the force does not increase.

[Brief description of the drawings]

FIG. 1 is a block diagram of a television receiver to which a microcomputer control device of the present invention is applied.

FIG. 2 is a waveform diagram of each part of a television receiver to which the microcomputer control device of the present invention is applied.

FIG. 3 is a circuit diagram showing a switch circuit unit of the microcomputer control device of the present invention.

FIG. 4 is a diagram illustrating an example of a configuration related to a power supply related to a microcomputer of a conventional television receiver.

FIG. 5 is a diagram illustrating an example of a configuration related to a power supply related to a microcomputer of a conventional television receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 Detection circuit 32 Main power supply circuit part 33 Regulator circuit part 34 Standby power supply part 36 Switch circuit part M Main microcomputer M1-M3 Sub microcomputer

Continuation of the front page (56) References JP-A-5-241688 (JP, A) JP-A-6-284307 (JP, A) JP-A-5-176258 (JP, A) JP-A-58-33325 (JP) JP-A-6-67762 (JP, A) JP-A-5-57976 (JP, U) JP-A-1-115380 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) G06F 1/26-1/30 H04N 5/63

Claims (3)

(57) [Claims] A main control means for receiving a supply from a standby power supply and performing overall control of the electronic device; and a power supply for receiving a supply from the main power supply and obtained from the main control means.
Depending on the initial setting information of the slave device, the specified function of the electronic device
Sub-control means for controlling the power supply, detecting means for detecting an instantaneous interruption of commercial power supplied to the electronic device, and power supply for branching the standby power and supplying the power to the sub-control means.
Power line, and
Switch means for turning on / off , wherein the switch means detects a momentary interruption in the detection means.
An electronic device, which is controlled so as to be turned on when touched . 2. The apparatus according to claim 1, wherein said main control means includes a detecting means.
When the instantaneous interruption is detected, the switch is turned on.
Electrodeposition of claim 1, wherein the controller controls the so that
Child equipment . 3. The electronic apparatus according to claim 1, wherein said main control means is remotely controlled .