KR101210738B1 - Sequence regulation circuit in a television - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sequence control circuit of a TV, wherein a DC voltage supplied to a brown-out pin of a standby IC is divided by a voltage drop caused by a plurality of resistors, and a bridge diode ( a voltage distribution unit for monitoring a voltage (BBR) of a bulk capacitor behind the bridge diode; And biasing the current to the brown-out pin of the standby IC to smooth the Vcc voltage supplied to the standby IC and to prevent the standby IC from restarting due to a drop in the voltage applied to the brown-out pin of the standby IC. and a Vcc voltage smoothing circuit portion.
The present invention utilizes a brown-out function, but satisfies the sequence of the TV set by using the self Vcc charge start function, which is a basic operation characteristic of the standby IC, and prevents the IC from restarting. By doing so, malfunction of the TV set can be prevented.

Description

Sequence regulation circuit in a television

The present invention relates to a sequence control circuit of a TV, and in particular, a brown-out function is used, but a sequence of TV sets is satisfied using a magnetic Vcc charge start function, which is a basic operating characteristic of a standby IC. The present invention relates to a sequence control circuit of a TV capable of preventing a malfunction of the TV set.

Currently, the sequence control circuit of the TV which is mass-produced is to stop the driving of the IC by using the AC-det (detection) circuit and the brown-out pin installed in the IC, or use the external discharge circuit to The sequence is satisfied.

1 is a view showing an example of configuring an AC-det circuit for adjusting the sequence of the TV according to the prior art.

As shown in Fig. 1, in the related art, an AC-det circuit 101 is configured to adjust the sequence of a TV, thereby fitting the sequence of the TV.

FIG. 2 is a diagram illustrating an AC-det circuit according to the related art to block feedback elements of an IC to satisfy brown-out specifications of a sequence and a TV.

As shown in FIG. 2, the AC-det circuit 201 is conventionally configured to block the feedback element 202 of the IC to satisfy the sequence of the TV and the brown-out specification of the TV.

However, the sequence control circuit of the conventional TVs of FIGS. 1 and 2 described above has a different sequence required for each TV set, and may have a 5V re-start depending on the operation mode of the TV. There is a problem that many and expensive manufacturing costs.

The present invention has been made in consideration of the above-described matters, but uses a brown-out function, but satisfies the sequence of a TV set by using a magnetic Vcc charge start function, which is a basic operation characteristic of a standby IC, It is an object of the present invention to provide a sequence control circuit of a TV that can prevent malfunction of the TV set.

In order to achieve the above object, the sequence control circuit of the TV according to the present invention,

The DC voltage supplied to the brown-out pin of the standby IC is divided by the voltage drop caused by a plurality of resistors, and when the AC power is turned off, the bulk capacitor behind the bridge diode A voltage divider for monitoring a voltage (BBR); And

Bias the current to the brown-out pin of the standby IC to smooth the Vcc voltage supplied to the standby IC and to prevent the standby IC from restarting due to a drop in the voltage applied to the brown-out pin of the standby IC. Vcc voltage smoothing circuit unit is characterized in that it includes.

Here, the voltage divider,

A fifth resistor branched at a common node of the first to fourth resistors in series connection relationship and the fourth resistor in association with the voltage drop; At least one capacitor connected in parallel to said fifth resistor, involved in an off sequence. In this case, the capacitor may be composed of two capacitors, a general capacitor and an electrolytic capacitor.

In addition, the first embodiment of the Vcc voltage smoothing circuit unit,

A general diode which allows a current to flow in one direction only according to the Vcc voltage;

A first resistor and a first zener diode connected in series between a high potential first node and a low potential common node connected to a cathode end of the general diode to form a circuit end;

A first smoothing capacitor connected in parallel to a circuit terminal comprising the first resistor and the first zener diode;

A second resistor provided between the common node at the high potential of the Vcc voltage smoothing circuit portion connecting the brown-out pin of the standby IC and the Vcc voltage smoothing circuit portion and the first smoothing capacitor;

A second smoothing capacitor disposed between the high potential common node and the low potential common node; And

And a second zener diode connected in parallel to the second smoothing capacitor.

Also, between the brown-out pin of the standby IC and the high-voltage common node on the side of the Vcc voltage smoothing circuit portion connecting the Vcc voltage smoothing circuit portion to bias the current from the Vcc of the standby IC to the brown-out pin of the standby IC. A resistor is installed.

The standby IC is restarted by biasing the current to the brown-out pin of the standby IC by the Vcc voltage smoothing circuit unit to maintain the voltage of the brown-out pin at or above an off threshold voltage. prevent (restart).

In addition, the second embodiment of the Vcc voltage smoothing circuit unit,

A general diode which allows a current to flow in one direction only according to the Vcc voltage;

A first smoothing capacitor disposed between the first node of high potential connected to the cathode of the general diode and the common node of low potential;

A second smoothing capacitor provided between the high potential common node and the low potential common node on the side of the Vcc voltage smoothing circuit portion connecting the brown-out pin and the Vcc voltage smoothing circuit portion of the standby IC;

A second zener diode connected in parallel to the second smoothing capacitor; And

Vcc is installed between the high potential first node N1 and the common node N2 of the high potential, and stabilizes the Vcc voltage by adjusting the level variation of the Vcc voltage supplied to the brown-out pin of the standby IC. It includes a voltage regulator.

Here, the Vcc voltage adjusting unit,

The emitter terminal is connected to the high potential common node N2, the collector terminal is connected to the high potential first node N1, and the base terminal is connected to the low potential common node N3 side. A transistor (Q1) for switching and amplifying the current according to the Vcc voltage supplied to the brown-out pin of the standby IC;

A resistor connected at one end to a collector terminal of the transistor Q1 and at the other end to a base terminal of the transistor Q1 and configured to flow a current according to a Vcc voltage to a base terminal of the transistor Q1; And

The cathode stage is connected to the base terminal of the transistor Q1, and the anode stage includes a first zener diode connected to the common node N3 of the low potential.

According to the present invention, the brown-out function is used, but the sequence of the TV set is satisfied using the magnetic Vcc charge start function, which is the basic operating characteristic of the standby IC, and the IC restarts. There is an advantage that can prevent the malfunction of the TV set by preventing it.

1 is a view showing an example of configuring an AC-det circuit for adjusting the sequence of the TV according to the prior art.
FIG. 2 illustrates an AC-det circuit according to the prior art to block the feedback element of the IC to satisfy the brown-out specification of the sequence and the TV. FIG.
3 is a view showing a configuration of a sequence control circuit of a TV according to the present invention.
Figure 4 shows a second embodiment of the Vcc voltage smoothing circuit portion of the sequence control circuit of the TV according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing the configuration of the sequence control circuit of the TV according to the present invention.

Referring to FIG. 3, the sequence control circuit of the TV according to the present invention includes a voltage divider 310 and a Vcc voltage smoothing circuit 320.

The voltage divider 310 divides the DC voltage supplied to the brown-out pin pin5 of the standby IC 302 by the voltage drop caused by a plurality of resistors, and bridges the AC power when the power is off. The voltage (BBR) of the bulk capacitor (not shown) behind the bridge diode (not shown) is monitored.

The Vcc voltage smoothing circuit unit smoothes the Vcc voltage supplied to the standby IC 302, and the standby IC 302 restarts when the voltage applied to the brown-out pin pin5 of the standby IC 302 drops. To prevent this, bias the current to the brown-out pin (pin5) of the standby IC (302).

Here, the voltage divider 310 is involved in the voltage drop, and at a common node with the first to fourth resistors R106, R107, R108, and R108A in series connection relationship and the fourth resistor R108A. A fifth resistor R109 which is branch-connected; At least one capacitor connected in parallel to the fifth resistor (R109) to participate in the off sequence (off sequence). In this case, the capacitor may be composed of two capacitors, a general capacitor C104A and an electrolytic capacitor C104.

In addition, the Vcc voltage smoothing circuit unit 320 (first embodiment) includes: a general diode D107 which allows a current to flow in one direction only according to the Vcc voltage; The first resistor R104 and the first resistor R104 which are connected in series between the high potential first node N1 and the low potential common node N3 connected to the cathode terminal of the general diode D107 to form a single circuit terminal. 1 Zener diode (ZD101); A first smoothing capacitor (C102) connected in parallel to a circuit terminal consisting of the first resistor (R104) and the first zener diode (ZD101); Between the brown-out pin (pin5) of the standby IC 302 and the high potential common node (N2) on the side of the Vcc voltage smoothing circuit portion 320 connecting the Vcc voltage smoothing circuit portion 320 and the first smoothing capacitor (C102). A second resistor R102 installed; A second smoothing capacitor (C103) disposed between the high potential common node (N2) and the low potential common node (N3); And a second zener diode ZD102 connected in parallel to the second smoothing capacitor C103.

In addition, the Vcc of the standby IC 302 is connected between the brown-out pin pin5 of the standby IC 302 and the common node N2 at the high potential side of the Vcc voltage smoothing circuit portion 320 connecting the Vcc voltage smoothing circuit portion 320. A resistor R108B for biasing the current from the standby IC 302 to the brown-out pin pin5 is provided.

In addition, the Vcc voltage smoothing circuit unit 320 biases a current to the brown-out pin pin5 of the standby IC 302 to off-threshold the voltage of the brown-out pin pin5. Keeping above the threshold voltage prevents the standby IC from restarting.

On the other hand, Figure 4 is a view showing a second embodiment of the Vcc voltage smoothing circuit portion of the sequence control circuit of the TV according to the present invention.

Referring to FIG. 4, the Vcc voltage smoothing circuit section (second embodiment) 420 includes a general diode D107 which allows the flow of current according to the Vcc voltage in only one direction; A first smoothing capacitor C102 provided between the high potential first node N1 and the low potential common node N3 connected to the cathode end of the general diode D107; Between the brown-out pin (pin5) of the standby IC 402 and the high potential common node (N2) on the side of the Vcc voltage smoothing circuit portion connecting the Vcc voltage smoothing circuit portion 420 and the low potential common node (N3). A second smoothing capacitor C103 installed; A second zener diode (ZD102) connected in parallel to the second smoothing capacitor (C103); And a level change of the Vcc voltage provided between the first node N1 of the high potential and the common node N2 of the high potential, and supplied to the brown-out pin 5 of the standby IC 402. Vcc voltage adjusting unit 421 for stabilizing the Vcc voltage.

Here, the Vcc voltage adjusting unit 421 has an emitter terminal E connected to the common node N2 of the high potential, and a collector terminal C connected to the first node N1 of the high potential. The base terminal (B) is connected to the low potential common node (N3) side of the transistor for switching and amplifying the current according to the Vcc voltage supplied to the brown-out pin (pin5) of the standby IC (402) (Q1); One end is connected to the collector terminal C of the transistor Q1, the other end is connected to the base terminal B of the transistor Q1, and a current according to the Vcc voltage is supplied to the base terminal B of the transistor Q1. Resistance to flow (R104); And a cathode terminal is connected to the base terminal B of the transistor Q1, and an anode terminal includes a first zener diode ZD101 connected to the low potential common node N3.

In FIG. 4, reference numeral 401 denotes a brown-out voltage (VBR), 402 denotes a standby IC, and 410 denotes a voltage divider. The configuration and function of the voltage divider 410 in FIG. Since the configuration and function of the 310 is the same, a description thereof will be omitted.

Then, the operation of the sequence control circuit of the TV according to the present invention having the above configuration will be briefly described with reference to FIG.

Referring to FIG. 3, when the AC power is off, the voltage (BBR) of the bulk capacitor (not shown) behind the bridge diode (not shown) drops (VBR) 301, and The voltage of the brown-out pin (pin5) of the standby IC 302, which is monitoring the VBR 301 by dividing by the first to fifth resistors R106, R107, R108, R108A, and R109 of the voltage divider 310, When the standby IC 302 falls below the off threshold voltage (IC shut down threshold voltage), the standby IC 302 stops operating.

If the voltage of the brown-out pin pin5 of the standby IC 302 continues to drop, the standby IC 302 is reset, and the standby IC 302 is restarted to output the standby IC 302. The voltage appears to temporarily hic-cup. At this time, the standby IC 302 repeats the restart until the PFC (Power Factor Correction) voltage (DC 400V in FIG. 3) drops to the minimum input voltage of the standby IC 302.

The present invention uses the self-start up function, which is a unique operation of the standby IC 302, to prevent restart of the standby IC 302 as described above. The current is biased to the out pin 5 to maintain the voltage supplied to the brown out pin 5 above the off threshold voltage. As a result, the standby IC 302 may not restart.

On the other hand, in the above process, the off sequence is adjusted by adjusting the charge and discharge voltage of the capacitors (C104A, C104) connected to the brown-out pin (pin5) of the standby IC (302).

As described above, the sequence control circuit of the TV according to the present invention uses a brown-out function, but satisfies the sequence of the TV set by using the magnetic Vcc charge start function, which is a basic operation characteristic of the standby IC. In addition, the IC can prevent the TV set from malfunctioning by preventing the IC from restarting.

As mentioned above, although the present invention has been described in detail with reference to the preferred embodiment, the present invention is not limited thereto, and it will be apparent to those skilled in the art that various changes and applications can be made without departing from the technical spirit of the present invention. Accordingly, the true scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the same should be construed as being included in the scope of the present invention.

101,201 ... AC-det circuit 202 ... feedback element of the IC
301,401 ... Brown-out Voltage (VBR) 302,402 ... Standby IC
310,410 ... Voltage divider 320,420 ... Vcc voltage smoothing circuit
421 ... Vcc voltage regulator

Claims (8)

The DC voltage supplied to the brown-out pin of the standby IC is divided by the voltage drop caused by a plurality of resistors, and when the AC power is turned off, the bulk capacitor behind the bridge diode A voltage divider for monitoring a voltage (BBR); And
Bias the current to the brown-out pin of the standby IC to smooth the Vcc voltage supplied to the standby IC and to prevent the standby IC from restarting due to a drop in the voltage applied to the brown-out pin of the standby IC. A sequence control circuit of a TV comprising a Vcc voltage smoothing circuit unit. The method of claim 1,
The voltage division unit,
A fifth resistor branched at a common node with the first to fourth resistors connected in series for voltage drop and the fourth resistor;
And at least one capacitor connected in parallel to the fifth resistor in an off sequence. The method of claim 2,
The capacitor is a sequence control circuit of the TV consisting of two capacitors of a normal capacitor and an electrolytic capacitor. The method of claim 1,
The Vcc voltage smoothing circuit unit,
A general diode which allows a current to flow in one direction only according to the Vcc voltage;
A first resistor and a first zener diode connected in series between a high potential first node and a low potential common node connected to a cathode end of the general diode to form a circuit end;
A first smoothing capacitor connected in parallel to a circuit terminal comprising the first resistor and the first zener diode;
A second resistor provided between the common node at the high potential of the Vcc voltage smoothing circuit portion connecting the brown-out pin of the standby IC and the Vcc voltage smoothing circuit portion and the first smoothing capacitor;
A second smoothing capacitor disposed between the high potential common node and the low potential common node; And
And a second zener diode connected in parallel to said second smoothing capacitor. The method of claim 1,
A resistor for biasing current from the Vcc of the standby IC to the brown-out pin of the standby IC is provided between the brown-out pin of the standby IC and the high-voltage common node on the side of the Vcc voltage smoothing circuit portion connecting the Vcc voltage smoothing circuit portion. Sequence control circuit of TV installed. The method of claim 1,
The standby IC is restarted by biasing the current to the brown-out pin of the standby IC by the Vcc voltage smoothing circuit unit to maintain the voltage of the brown-out pin above the off threshold voltage. TV sequence control circuit. The method of claim 1,
The Vcc voltage smoothing circuit unit,
A general diode which allows a current to flow in one direction only according to the Vcc voltage;
A first smoothing capacitor installed between the high potential first node N1 and the low potential common node N3 connected to the cathode of the general diode;
A second smoothing capacitor provided between the high potential common node (N2) and the low potential common node (N3) on the side of the Vcc voltage smoothing circuit portion connecting the brown-out pin and the Vcc voltage smoothing circuit portion of the standby IC;
A second zener diode connected in parallel to the second smoothing capacitor; And
Vcc is installed between the high potential first node N1 and the common node N2 of the high potential, and stabilizes the Vcc voltage by adjusting the level variation of the Vcc voltage supplied to the brown-out pin of the standby IC. Sequence control circuit of the TV comprising a voltage adjusting unit. The method of claim 7, wherein
The Vcc voltage adjusting unit,
The emitter terminal E is connected to the common node N2 of the high potential, the collector terminal C is connected to the first node N1 of the high potential, and the base terminal B is of the low potential. A transistor (Q1) connected to the common node (N3) side for switching and amplifying the current according to the Vcc voltage supplied to the brown-out pin of the standby IC;
One end is connected to the collector terminal C of the transistor Q1, the other end is connected to the base terminal B of the transistor Q1, and a current according to the Vcc voltage is supplied to the base terminal B of the transistor Q1. Resistance to shedding); And
And a cathode terminal is connected to a base terminal (B) of the transistor (Q1), and an anode terminal is connected to the low potential common node (N3).

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