KR930003569Y1 - Vertical size control circuit for crt - Google Patents

Abstract

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Description

Vertical Size Adjustment Circuit of Monitor Using Flyback Trans

1A and 1B are high voltage generation and vertical size adjustment circuit diagrams of a conventional monitor.

Figure 2 is a vertical size adjustment circuit of the monitor using the flyback transformer of the present invention of FIG.

* Explanation of symbols for main parts of the drawings

1: Vertical deflection integrated element SMPS: Switching mode power supply

P ₁ , P ₂ : Input terminal P ₃ : Vertical size adjustment terminal

P ₄ : vertical deflection FBT: flyback transformer

R ₁₀₁ , R ₁ -R ₈ : Resistance VR ₁₀₁ , VR ₁₀₂ , VR ₁ , VR ₂ : Variable resistor

C ₁₀₁ , C ₁ , C ₂ : condenser Q ₁₀₁ , Q ₁ -Q ₄ : transistor

B ⁺ , V ₁ , V ₂ : Power L ₁ : Coil

The present invention relates to a vertical size adjustment circuit of a monitor, in particular, by using an input power supply of a flyback transformer and an output power supply of a switching mode power supply (SMPS). It relates to a vertical size adjustment circuit of a monitor using a flyback lance that allows the vertical size to be adjusted.

In the high voltage generation and vertical size adjustment circuit of the conventional monitor, as shown in FIGS. 1A and 1B, the power supply V ₁ to which the horizontal drive signal passing through the input terminal P ₁ is applied to the horizontal deflection coil L ₁ . Power supply (B ⁺ ) passing through the noise canceling capacitor (C ₁₀₂ ) after the transistor Q ₁₀₁ is turned on and is applied to the primary side of the flyback transformer (FBT) and the capacitor (C ₁₀₁ ) and resonates. The high pressure is induced from the secondary side of the flyback transformer (FBT) and is applied to the CRT. The vertical deflection integrated element (1) has a vertical synchronous signal and a variable resistor (VR ₁₀₁ ) (VR ₁₀₂ ) passing through the input terminal (P ₂ ). The vertical deflection is performed by the power supply (V ₂ ) that passes through), but the vertical size is adjusted by adjusting the variable resistor (VR ₁₀₁ ) (VR ₁₀₂ ), but the power supply () is applied to the primary side of the flyback transformer (FBT). since B ⁺⁾ is input as it is so that the voltage regulation is not good, the critical point of the variable resistor (VR ₁₀₁₎ (VR ₁₀₂₎ Because by limiting the vertical size had a defect that a large dose not apply to prevent cathode-ray tube.

In view of such deficiencies, the flyback transformer is designed to improve the power regulation and widen the vertical size by adjusting the vertical size of the vertical deflection with the driving voltage of the flyback transformer and the switching power supply of the flyback transformer. The vertical size adjustment circuit of the monitor was devised, which will be described in detail with reference to the accompanying drawings.

FIG. 2 is a vertical size adjustment circuit diagram of a monitor using a flyback transformer. As shown therein, a drawing power supply of the switching mode powder fly (SMPS) is connected to each of the bias resistors R ₂ (R ₆ -R ₈ ). Amplified continuously through the transistors Q ₂ -Q ₄ to supply power to the primary side of the flyback transformer FBT through the distribution resistor R ₁ and the noise canceling capacitor C ₃ together with the variable resistor VR ₁ . (B ⁺ ) is applied to the transistor Q through the bias resistor (R ₃ ) (R ₄ ) with the power passing through the variable resistor (VR ₁ ) passed through the vertical size adjustment stage (P ₃ ). After driving ₁ ,), the vertical size of the vertical deflection stage P ₄ is adjusted by adjusting the noise removing capacitor C ₂ , the distribution resistor R ₅ , and the variable resistor VR ₂ .

Referring to the effect of the present invention configured as described above are as follows.

As shown in FIG. 2, the drawing power of the switching mode powder supply SMPS is applied through the resistor R ₂ and the high potential is applied to the base side of the transistor Q ₄ through the bias resistor R ₆ . As the transistor Q ₄ is turned on and then the transistors Q ₃ and Q ₂ are continuously turned on, the power drawn from the switching mode powder supply SMPS passes through the transistors Q ₂ -Q ₄ . It is amplified to supply sufficient power (B ⁺ ) to the primary side of the flyback transformer (FBT).

Then, the power supply B ⁺ passing through the primary side of the flyback transformer FBT is applied to the distribution resistor R ₁ , R ₂ , the noise canceling capacitor C ₁ , and the variable resistor VR ₁ to supply the current. LOOP, wherein a power applied to the variable resistor VR ₁ applies a high potential to the base side of the transistor Q ₁ through a bias resistor R ₃ (R ₄ ), thereby providing a transistor Q ₁ . after turning on the adjusting the vertical size only (P ₃₎ the power transistor output power is noise reduction applied to the collector side of the transistor (Q ₁₎ as through the (Q ₁₎ is on the base side of the transistor (Q ₁₎ of The vertical size is formed by being applied to the vertical deflection stage P ₄ through the condenser C ₃ , the distribution resistor R ₅ , and the variable resistor VR ₂ .

Here, the resistor R ₅ and the variable resistor VR _{2 change} the vertical size.

That is, when increasing the vertical size, the current I of the vertical size adjusting stage P ₃ is formed by the sum of the collector current Ic of the transistor Q ₁ and the current I _DY of the vertical deflection stage P ₄ . a power supply (B ⁺⁾ amplified in the primary side of the after transistor (Q ₁₎ collector current (I _c) to the transistor _{(Q 4) (Q 3)} (Q 2) to by the flyback transformer (FBT) bias in sequence of the It is sikineunde, wherein the variable resistor (VR ₁₎ to when to reduce the base-side current of the transistor (Q ₁₎ to adjust, as soon reducing the collector-side current (I _C) of the transistor (Q ₁₎ as well as the vertical deflection stage (P ₄₎ of the current (I _DY) that will greatly by being that the vertical dimension significantly, this time becomes a vertical size by adjusting the current (I _DY) of the variable resistor (VR ₂₎ to the vertical deflection stage (P ₄₎ adjustment.

When the vertical size is reduced, the collector power supply I _c of the transistor Q ₁ is increased by adjusting the variable resistor VR ₁ , and the current I _DY of the vertical deflection stage P ₄ is reduced. The vertical size is adjusted small.

As described above, the present invention amplifies and controls the draw power of the switching mode powder and supplies it to the flyback transformer so that the regulation of the power is corrected and the monitor screen can be stably adjusted even if the vertical size is adjusted to the maximum. It works.

Claims (1)

In a high-voltage generator circuit in which a flyback transformer (FBT) is driven by a horizontal drive signal and a power supply (B ⁺ ) to generate a high voltage, the power drawn from the switching mode power supply (SMPS) is biased (R ₆ -R). ₈ ) and a power supply to the primary side of the flyback transformer (FBT) through the resistor (R ₁ ) (R ₂ ), the variable resistor (VR ₁ ) after being heavy through the transistor (Q ₂ -Q ₄ ) connected to B ⁺ ) is applied to the transistor Q ₁ through the bias resistors R ₃ and R ₄ together with the power supplied to the variable resistor VR ₁ through the vertical size adjustment stage P ₃ . The vertical size adjustment circuit of the monitor using a flyback transformer, characterized in that configured to adjust the vertical size of the vertical deflection stage (P ₄ ) through a variable resistor (VR ₂ ) after driving.