JPH03217171A - High voltage regulator device - Google Patents

Abstract

PURPOSE:To obtain a speed-up capacitor with high breakdown strength by utilizing a high voltage conductive film and a glass wall provided in a CRT. CONSTITUTION:Small metallic pieces are stack as external electrodes 13 on the glass wall outer surface of a CRT 7 while being faced to a high voltage conductive film 11 of the CRT 7 and therefore, a high voltage capacitor is constituted while sandwiching a suitable dielectric like glass. Only by connecting this external electrode 13 to a connecting point between potential dividing resistors RX and RY, a circuit can be constituted to parallelly connect the potential dividing feedback resistor RX and a capacitor CX.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-voltage regulator device, and more particularly to a method of using a capacitor configured between glass walls of a CRT to improve the responsiveness of a regulator device. ．． [Prior Art] A high voltage regulator device is used in a television receiver, a CRT display device, or the like to supply high voltage to a CRT. High pressure regulator device
If the anode current of the CRT changes depending on the brightness of the screen, the size of the rask changes or the focus changes, so a high dynamic stabilization ability is required.

FIG. 3 shows a high voltage regulator device used in conventional CRT display devices and the like. The device in the figure has a control voltage of ■. A high-voltage output circuit 1 whose output voltage can be adjusted by 1, resistors RX and R forming a voltage-dividing circuit for dividing the high-voltage output 1, an error amplifier 3, and a control circuit 5.
It is composed of and etc.

In this high voltage regulator device, high voltage output circuit 1
The output voltage VH of is divided by the resistors Rx and RY to generate a detection voltage ■, which is applied to the negative input terminal of the error amplifier 3. A reference voltage VR is applied to the positive input terminal of the error amplifier 3, and the error amplifier 3 compares these voltages (1) and (8) and inputs an output corresponding to the difference between them to the control circuit 5. The control circuit 5 uses this error amplifier 3
■ Control signal according to the output voltage. is generated and applied to the control input terminal of the high voltage output circuit. Assume that a high voltage output voltage V1 is supplied to the anode electrode of a CRT, for example, and when the screen of the CRT becomes brighter, the anode current increases and the high voltage output VH decreases. As a result, the detection voltage (2) also decreases, and the control circuit 5 outputs the control signal (V). For example, by increasing the voltage level of V. control in the direction of raising. This stabilizes the high voltage output VH.

In the device shown in Figure 3, the high voltage output ■1 is, for example, 25
KV, whereas the detection voltage Vd is several volts. For this reason, the resistors R and Rv that constitute the voltage dividing circuit
The ratio of For this reason, a small-capacity speed-up capacitor C is usually connected in parallel with the resistor Rx.
By connecting x, the response of the regulator device can be improved. Further, the capacitor C is added to the input capacitance of the error amplifier 3 as necessary, and serves to remove noise from the feedback circuit.

[Problems to be Solved by the Invention]However, in the device shown in FIG.
The speed-up capacitor connected in parallel with the regulator needs to have an extremely high withstand voltage, which has the disadvantage of increasing the price of the regulator device and increasing the space it occupies. Furthermore, since a high withstand voltage capacitor for smoothing is normally connected to the output terminal of the high voltage output circuit 1, using the aforementioned high withstand voltage speed-up capacitor in addition to this high withstand voltage smoothing capacitor will avoid the above-mentioned disadvantages. This contributes to an increase in the price of the device and an increase in the space it occupies.

SUMMARY OF THE INVENTION Therefore, in view of the above-mentioned problems in the conventional device, an object of the present invention is to configure a speed-up capacitor in a high-voltage regulator device using a CRT glass wall, thereby preventing an increase in the price and occupying volume of the regulator device. while improving responsiveness.

[Means for Solving the Problems] A high voltage regulator device according to the present invention includes a high voltage generation circuit, a voltage division feedback circuit that divides and feeds back an output voltage of the high voltage generation circuit using an impedance element, and the voltage division feedback circuit. and a control circuit that generates a control signal based on the output of the high voltage generating circuit to adjust the output voltage of the high voltage generating circuit, and supplies the adjusted high voltage to the CRT. And said C
A high voltage capacitor is constructed by providing a high voltage conductive portion on the inner surface of the glass wall of the RT and an electrode on the outer surface of the glass wall of the CRT opposite to the high voltage conductive portion, and this high voltage capacitor is used for feedback of the voltage dividing feedback circuit. Connected in parallel to the impedance element.

5. [Operation] In the above-described configuration, the output voltage of the high voltage generation circuit is divided into a low voltage by the voltage dividing feedback circuit and input to the control circuit. The control circuit generates a control signal based on this divided voltage to adjust the output voltage of the high voltage generation circuit.

As a result, the adjusted high voltage output voltage from the high voltage generation circuit is supplied to the CRT. In such an operation, a high-voltage capacitor formed between the glass walls of the CRT is connected to the feedback impedance element of the voltage-dividing feedback circuit and acts as a speed-up capacitor. Therefore, the response characteristics of the adjustment of the high-voltage output voltage are accelerated. And C as a speed-up capacitor
Utilizing the RT wall eliminates the need for a separate, independent high voltage capacitor, thus reducing the volume occupied by the high voltage regulator device and reducing cost.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows gXq of a high-voltage regulator device according to an embodiment of the present invention.6 The device shown in the same figure is constructed on the wall surface of the CRT 7 in place of the speed-up capacitor Cx in the conventional regulator device shown in FIG. The high-voltage capacitor C8 is used. The CRT 7 is normally provided with an anode electrode 9, and the CR.
A high voltage is applied to the high voltage conductive film 11 formed on the inner surface of the glass wall of T7. Therefore, the high voltage conductive film 1 of the CRT 7
By attaching a small piece of metal as an external electrode 13 to the outer surface of the glass wall of the CRT 7 facing the CRT 7, a high voltage capacitor can be constructed by sandwiching a suitable dielectric material such as glass. Furthermore, by simply connecting this external electrode 13 to the connection point between the voltage dividing resistor R and RY, a circuit in which the voltage dividing feedback resistor R and the capacitor Cx are connected in parallel can be constructed. Note that the external electrode 13 is a CRT7
It may be attached to the outer surface of the glass wall by, for example, vapor deposition, adhesive bonding, or any other method.

FIG. 2 shows in detail the structure of a high pressure regulator device according to another embodiment of the present invention.

The device in the figure includes transistors Ql, Q2, Q3Q4, diodes DI, D2, coupling transformer T1, flyback transformer T2, capacitors ci, c2, C3, CY,
Resistance Rl. R2, R3, R. x,R,, operational amplifier 19
, and a speed-up capacitor Cx, which is sandwiched between the glass walls of the CRT as explained in FIG.

Transistor Q2, diode D1, capacitor C1,
Flyback transformer T2, high voltage rectifier diode D2
, smoothing capacitor 02, etc. constitute a general high voltage generation circuit. Among the components of the high voltage generation circuit, the flyback transformer T2, high voltage diode D2, smoothing capacitor C2, and voltage division feedback resistor Rx are, for example, the high voltage output circuit unit 17.
It is integrated as a. The base of the transistor Q1 is connected to the input terminal IN, the collector is connected to one end of the primary coil of the coupling transformer [1], and the emitter is grounded.

The other end of the primary coil of the coupling transformer T1 is connected to the power supply Vcc, and one end of the secondary coil is connected to the transistor Q2.
The other end is connected to the base and grounded. The emitter of the transistor Q2 is grounded, and the collector is connected to one terminal P1 of the primary coil N1 of the flyback transformer T2. A tamper diode D1 and a capacitor C1 are connected in parallel between the terminal P1 and ground.

One end of the secondary coil N2 of the flyback transformer T2 is connected to a high voltage output terminal P2 via a diode D2, and the output terminal P2 is connected to the 62nd coil N2 which is connected to the internal conductive film 11 via the anode 9 of the CRT. The other end is terminal P
It is grounded via 4. A capacitor C2 is connected between the output terminal P2 and ground. The output terminal P
2 is further connected to one end of a resistor R, and the other end of the resistor RX is connected to one end of the resistor R via a terminal 23. The other end of the resistor RY is grounded. A capacitor C is connected in parallel to the resistor R.

The Y resistors R and R constitute a voltage dividing feedback circuit, and the output point P3 of this voltage dividing feedback circuit is connected to the positive polarity input terminal of an operational amplifier 19 forming an error amplifier. The negative polarity input terminal of one operational amplifier has a reference voltage of 1.

connected to f. The output of the operational amplifier 19 is connected to the base of the transistor Q3, and the negative input terminal is further connected to the emitter of the transistor Q3 via a resistor R3.

The emitter of transistor Q3 is grounded via resistor R2, and the collector is connected to the base of transistor Q4 and resistor R.
1 to the power supply 1B. One end P5 of the primary coil N1 of the flyback transformer T2 is connected to the power supply voltage 10B via the emitter-collector circuit of the control transistor Q4. The emitter of transistor Q4 is grounded via capacitor C3.

In such a circuit, it should be noted that the aforementioned high voltage capacitor CX is connected in parallel with the voltage division feedback resistor RX in the high voltage output circuit unit 17. This high voltage capacitor CX is connected to the internal conduction II of the glass wall 15 of the CRT! 11 and an external electrode 13. The internal conductive film 11 is made of C10R. It is connected to the output terminal P2 of the high voltage output circuit unit via the anode 9 of the T.

In the regulator device of FIG. 2, a horizontal synchronizing pulse with a duty of 50%, for example, is applied to the input terminal IN. As a result, the transistor Q1 is turned on and off, and the transistor Q2 is also turned on and off via the drive transformer T1. When the transistor Q2 changes from the on state to the off state, as is well known, the flyback transformer T2
A flyback pulse is generated at one end P1 of the next coil N1. The peak voltage of this flyback pulse is, for example, IK
This flyback pulse is boosted to several tens of kilovolts by the flyback transformer T2 and converted to direct current by a rectifying and smoothing circuit including a diode D2 and a capacitor C2, thereby generating a high sweat output voltage VH at the output terminal P2. This high voltage output voltage (1) has a voltage value of, for example, about 25 KV and is supplied to the internal conductive film 11 and other parts via the anode 9 of the CRT.

The above-mentioned high-voltage output voltage ■ is divided by a voltage dividing circuit composed of a high resistance Rx and a resistor H 11 resistor R, to generate, for example, several detection voltages ■, which are applied to the positive input terminal of the operational amplifier 19. applied. As a result, the detection voltage
and a reference voltage of 10 V. The voltage corresponding to the difference between f and d is applied to the operational amplifier 19 and the transistor Q3.
to the base of the control transistor Q4. Therefore, for example, the brightness of the display screen by CRT increases and the output voltage becomes high. When the voltage decreases, the output voltage of the operational amplifier 9 decreases, the collector voltage of the transistor Q3 increases, and the emitter voltage of the transistor Q4 also increases. As a result, the power supply voltage supplied to the high voltage generation circuit increases, and the amplitude of the flyback pulse increases. Therefore, the high voltage output voltage vFI is adjusted in the direction of increasing. When the high-voltage output voltage V1 increases, adjustment is performed to lower it by a similar operation.

As described above, in such a high output voltage adjustment operation, the speed-up capacitor Cx connected in parallel to the voltage division feedback resistor RX improves the responsiveness of the voltage adjustment operation. 12 Then, the value of speed-up capacitor Cx is C
By selecting x = C Y R Y , accurate adjustment operation can be performed. Therefore, the value of Cx is usually the number 1
0PF is also sufficient.

[Effects of the Invention J As described above, according to the present invention, it is possible to construct a high-voltage speed-up capacitor by using the high-voltage conductive film and glass wall originally provided in a CRT, and it is possible to construct a speed-up capacitor with a high withstand voltage. The circuit performance of a high-voltage regulator device can be improved without using a high-voltage capacitor. Additionally, the volume occupied by the device can be reduced and the cost can be lowered.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram schematically showing a high-pressure regulator device according to one embodiment of the present invention, FIG. 2 is an electric circuit diagram showing details of a high-pressure regulator device according to another embodiment of the present invention, and 13 FIG. 3 is a block circuit diagram showing a conventional high voltage regulator. Outline of the equipment 1: High voltage output circuit, 3: Error amplifier, 5: Control circuit,
7: CRT, 9: Anode, 11: Internal high voltage conductive film, 13: External electrode, 15: Glass wall, 17: High voltage output circuit unit, 19: Operational amplifier, RX, R,,, R,, Rl, R2, R3: resistance, Cx,
CY, CI, C2, C3: Capacitor, Ql. Q2,
Q3, Q4: }Transistor, DI, D2: Diode, T1: Coupling transformer, T2: Flyback transformer.

Claims (1)

[Claims] 1. A high voltage generation circuit whose output voltage can be adjusted according to a control signal, a voltage division feedback circuit which divides and feeds back the output voltage of the high voltage generation circuit using an impedance element, and the voltage division circuit. and a control circuit that generates the control signal based on the output of the feedback circuit, and supplies a regulated high voltage to a CRT, the high voltage regulator device comprising: a high voltage conductive portion on an inner surface of a glass wall of the CRT; A capacitor constituted by an electrode provided on the outer surface of the glass wall of the CRT facing the voltage conductive portion is provided, and the high voltage output is A high-voltage regulator device characterized by faster voltage adjustment.