KR200182145Y1 - Operation tester power back-up circuit - Google Patents

Abstract

The present invention relates to a power back up function of a VCR (Video Cassette Record) and a television. In particular, when the input power is cut off due to a power failure while using an electronic device, the power stored in the backup capacitor The present invention relates to a device that can check the status of a backup capacitor by compensating power by supplying power and outputting a power supply status on a screen. In the present invention, a high signal is applied from the microcomputer to the base terminal of the first transistor to block the signal flow of the second transistor supplying power from the power supply to the memory IC and the timer IC. Therefore, the memory IC and the timer IC are Since the discharge voltage of the backup capacitor is applied to the microcomputer, the microcomputer detects the discharge voltage of the backup capacitor and outputs the operation state of the backup capacitor to the OSD screen, so that the operation state of the power backup circuit can be visually confirmed. Is presented.

Description

Operation check device of power backup circuit

The present invention relates to the power up (Back Up) function of VCR (Video Cassette Record). Especially, when the input power is cut off due to power outage during the use of electronic devices, the backup power can be supplied automatically. The operation of the power backup circuit that the microcomputer senses the power accumulated in the capacitor and displays the information on the power of the capacitor detected by the program embedded in the microcomputer on the television screen so that the viewer can confirm it. Apparatus for checking process of power back-up circuit.

In general, the back up function automatically supplies the power of the pre-charged backup capacitor when the power is cut off due to a momentary power failure or a predetermined power outage during the use of electronic devices such as televisions, computers, and audio. This means that the driving operation of the electronic device is prevented from being stopped to prevent the contents stored in the memory from being erased. The power charged in the backup capacitor is not supplied to all the circuit parts of the electronic device, but is supplied to the memory IC part and the timer IC part to which power is always supplied to compensate for the power for a predetermined time. Therefore, the VCR currently being used also has a function called a power backup and a timer backup. The power backup and the timer backup, as described above, also have a timer unit for preserving the microcomputer program in which the timer is stored for instantaneous power failure and constant power failure. This function compensates the power for a certain time.

1 is a block diagram showing a power backup apparatus according to the prior art.

FIG. 1, which shows a power backup device, includes a power supply unit 10, other drivers 20, a memory IC unit 30, a timer IC unit 40, a resistor 11, and a capacitor 12.

Referring to the prior art configured as described above, the power supply unit 10 supplies the power required by the other driver 20, the memory IC unit 30 and the timer IC unit 40. The memory IC unit 30 stores reservation recording and other programs, and the timer IC unit 40 stores information on time. Therefore, when the power supply is cut off due to the instantaneous power failure and the power failure state for a predetermined time as described above, the power charged in the capacitor 12 is stored in the memory IC unit 30. And the timer IC unit 40. The reason why the power charged in the capacitor is not fed back to the power supply 10 and the other driver 20 is because the high value resistor 11 is used so that the power cannot be reversed. The power is compensated by using a supercapacitor that can charge a super capacity. However, as described above, the viewer can check the operation state of the capacitor supplying power in the power failure state, so if the backup capacitor supplying power in the event of power failure occurs, it is troublesome to check the power supply again after turning off the power. In the event of a power outage in the unprotected state, important information may be lost.

The present invention is to solve the above problems, in the present invention by using a diode, a transistor and a resistor to detect the power supply of the backup capacitor from the microcomputer even in the normal and abnormal state of the power supply. An apparatus and a method for confirming an operation of a power backup circuit, which enables the display of a detected power supply to be displayed on a television screen, to confirm an operation state of a backup capacitor, have been proposed.

1 is a circuit diagram of a conventional power backup device

Figure 2 is a block diagram showing an apparatus capable of confirming the operation of the power backup circuit according to the present invention

3 is a flowchart illustrating a method for confirming an operation of a power backup circuit according to the present invention.

4 is an operation state display diagram of the backup capacitor displayed by FIG.

<Description of the symbols for the main parts of the drawings>

10: power supply 20: other driving unit

30: memory IC unit 40: timer IC unit

50: micom R1, R2, R3, R4: resistance

12, 17: capacitor Q1, Q2: transistor

D1: diode A: output terminal of the microcomputer

B: input terminal of microcomputer 60a: switching unit

The present invention adds a diode (D1), resistors (R1, R2, R3, R4), two transistors (Q1, Q2) and a backup capacitor (C1) from the prior art, the power supply unit by the control operation of the microcomputer 50 The present invention relates to a device that detects the state of the backup capacitor (C1) by blocking the output voltage of the circuit and outputs it to the screen so that the operation of the power backup circuit can be checked. Electronic devices such as a Vedio Cassette Record and a television A power supply unit 10 for converting an AC voltage into a DC voltage to supply power required for each circuit portion of the system; Other drivers 20 for driving signals corresponding to video signal processing and audio signal processing by the power applied from the power supply unit 10; A memory IC unit 30 that requires supply of backup power to retain stored information even when the power is turned off; A timer IC unit 40 storing and outputting information on a date, a day, and a time; A microcomputer 50 which detects the power supply of the backup capacitor and controls the display of the state of the backup capacitor C1 so that the user can check the operation state; When the high signal is applied from the microcomputer 50, the first transistor Q1 is turned on and a low current is supplied to the base terminal of the second transistor Q2 to switch off the voltage output from the power supply unit 10. It consists of a part 60a.

FIG. 2 is a block diagram of a device capable of confirming an operation of a power backup circuit configured as described above. FIG.

As a basic circuit for operating an electronic device, a power supply unit 10 for converting an AC voltage into a DC voltage and supplying power required for each circuit part is composed of a power supply primary side and a power supply secondary side, and the power supply primary side is connected through a power cord. A filter and a capacitor filter power noise components, and the filtered AC power is transferred to a power conversion unit through a fuse and down to a required voltage at the secondary side. On the other hand, the AC voltage down through the power conversion section on the power supply secondary side is full-wave rectified in the bridge rectifier circuit, and the full-wave rectified pulse current is smoothed by a large electrolytic capacitor, and the voltage is supplied to the constant voltage circuit at each stage. . In the constant voltage circuit, a ripple voltage including a lot of ripple is converted into a DC voltage to supply power required by each circuit part. In addition, the constant voltage circuit used in the VCR, for example, uses a transistor constant voltage circuit or an IC constant voltage circuit as the most basic circuit. In the constant voltage circuit, the digital power supply and the analog power supply are separated to minimize the interference of the digital signal and the analog signal.

Therefore, according to the constitution according to the present invention, the power output from the power supply unit 10 is normally applied to the other driver 20, the memory IC unit 30, and the timer IC unit 40. As described above, a process in which power is applied from the power supply unit 10 to each circuit unit as usual will be described. First, the power supply unit 10 supplies power to the other driving unit 20 through the resistor R1, and the second transistor Q2. When a current is applied to the base terminal of the C1, the second transistor Q2 is brought into a conductive state, so that the emitter terminal is connected to the collector terminal of the resistor R1, diode D1 and second transistor Q2 from the power supply 10. The power is supplied to the memory IC unit 30 and the timer IC unit 40 via the resistor R3 again.

When the power is not output from the power supply unit 10 due to a power failure or other reasons, the backup IC C1, which is a supercapacitor having a supercapacitor, is used in the memory IC unit 30 and the timer IC unit 40 that require power. The charged power is supplied. On the other hand, in order to prevent the charge charged in the backup capacitor C1 from flowing backward to the rear end of the capacitor, an R3 resistor having a very large resistance value is used at the rear end of the backup capacitor C1.

Therefore, the circuits 20, 30, and 40 are supplied from the power supply unit 10 due to the process of applying power from the power supply unit 10 to the respective circuit units 20, 30, and 40, and for power failure and power off. The process of supplying power to each circuit unit requiring power supply by the backup capacitor C1 when the power is not supplied to the power supply circuit is explained. The two transistors Q1 and Q2 are supplied with the power supplied from the process. The power supply 10 is cut off, the microcomputer 50 detects the discharge current output from the backup capacitor C1, and the detected information is displayed on a television screen. You can check the status.

The process of checking the state of the backup capacitor C1 by the microcomputer 50 will be described in detail as follows. First, since the viewer needs a button to operate in order to check the state of the backup capacitor C1, the remote controller (not shown) is provided with a button such as 'check backup power'. When the button is selected by the viewer, a signal corresponding to 'backup power check' is applied to the microcomputer 50, and the microcomputer 50 detects the corresponding signal as an electrical signal to output an output terminal of the microcomputer 50 ( When the high signal High is applied to A), the first transistor Q1 is in a conductive state, so that the output power of the power supply unit 10 is not applied to the backup capacitor C1. Therefore, since power is not applied from the power supply unit 10, the power charged in the backup capacitor C1 is not reversed by the backflow prevention diode D1, and is supplied to the memory IC unit 30 and the timer IC unit 40. Since the microcomputer 50 is supplied, the microcomputer 50 detects the power applied to the memory IC unit 30 and the timer IC 40 by the input terminal B of the microcomputer 50, and the information on the detected power is The OSD is displayed on the television screen by the OSD blanking signal of the microcomputer 50.

Therefore, when the power supplied from the power supply unit 10 is cut off and the power supply of the backup capacitor C1 is checked, normal operation is performed when the specified voltage of the power supply unit 10 is detected, and the power supply unit 10 is defined. If a voltage lower than the voltage is detected, it may be determined that the abnormal state. In order to check the operation state determined as described above, there is a method of using an LED, a method of operating a speaker using a buzzer, and a method of displaying a state of a backup capacitor on a screen. By displaying the operation of the backup capacitor, the status of the backup capacitor can be checked.

3 is a flowchart illustrating a method of outputting the state of the backup capacitor detected from the microcomputer 50 to the screen. The flow chart consists of the initialization (S10), the backup function test (S20), the power supply detection of the backup capacitor (S30) and the display (S40) step, in the initialization step (S10) by the microcomputer 50, the recent backup capacitor. Reset is performed to detect the voltage charged in (C1). After the reset operation is completed in the initialization step (S10), in the backup function test (S20) step, whether the first output terminal of the microcomputer 50 is high by an electrical signal corresponding to the backup power check button caused by the viewer by the remote controller. If it is high, the next step is executed. If the state is low, the process returns to the previous step. When the backup function test (S20) is a high signal (S30), the power supply of the backup capacitor (S30) detects the voltage charged in the backup capacitor, and the detected voltage is programmed in advance of the microcomputer 50 The display device stored in the memory is displayed on the screen in the display step S40 by the OSD blanking signal.

4 shows a state in which a backup capacitor is displayed on a screen. The power applied from the power supply unit 10 is 100% (60), and the power of the current backup capacitor can be confirmed by a bar graph 62. At the same time, the power supplied from the power supply unit 10 and the power of the capacitor are checked to match the normal operation, if not matched with abnormal operation to check the state of the backup capacitor.

As described above, in the present invention, when a high signal is applied to the output terminal of the transistor through the output terminal A of the microcomputer, the power applied from the power supply unit is supplied to the transistor terminal at the collector terminal including the R ₂ resistance of the transistor. Flows to the backup terminal, blocks the flow to the backup capacitor, and detects the power charged to the backup capacitor through the input terminal of the microcomputer and checks the status of the backup capacitor on the screen by the OSD blanking signal through another output terminal of the microcomputer. It has the effect of making it possible.

Claims (3)

In the diode (D1), a transistor that can verify the operation of (Q1, Q2), the backup capacitor (C1), and _{R 1, R 2, R 3} , a power-up circuit having a resistance R ₄ of the device, As the most basic circuit for operating Vedio Cassette Record, it converts AC voltage into DC voltage and supplies power to other driver 20, memory IC 30, and timer IC 40. Power supply unit for supplying the; Other drivers 20 of the VCR for recording and reproducing image signals operated by a power source supplied from the power supply unit 10, A memory IC unit 30 for storing a program for a general, daily, weekly scheduled recording function, etc. for the VCR by the power applied from the power supply unit 10; A timer IC unit 40 storing and outputting information on a date, a day, and a time; And a microcomputer (50) configured to detect the power of the backup capacitor and display the state of the backup capacitor so that the user can check the operation state. 2. The microcomputer 50 of claim 1, wherein the microcomputer 50 applies a high signal to the first transistor Q1 through the A output terminal to supply power from the collector terminal of the first transistor Q1 to the emitter terminal. Since the second transistor Q2 is turned off, the power applied from the power supply unit 10 is cut off, and since the power charged in the backup capacitor C1 is discharged because the power is cut off, the microcomputer 50 discharges the discharge power. An operation check device for a power supply backup circuit, characterized in that for detecting. The apparatus of claim 1, wherein the backup capacitor (C1) supplies power to the memory IC unit (30) and the timer IC unit (40) during a power failure.