JP2001036347A - Amplitude correction circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce amplitude fluctuation due to the external disturbance voltage of a current flowing to a resonance circuit and to eliminate power loss generated in a resistor. SOLUTION: This amplitude correction circuit is provided with a pulse generating circuit a proper pulse voltage to cancel amplitude fluctuation in the resonance current of a resonance circuit 1 caused by an external disturbance voltage, a power supply voltage modulating circuit 102 that modulates a power supply voltage VB with the pulse voltage, and a rectangular voltage generating circuit 101 that generates a rectangular voltage V1 for driving the resonance circuit 1, on the basis of a modulated power supply voltage 104. Modulation of the power supply voltage by the pulse voltage and correction of the rectangular voltage V1 reduce the amplitude fluctuation in the resonance current caused by an external disturbance voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amplitude correction circuit for reducing an amplitude fluctuation of a current flowing through a resonance circuit including a coil and a capacitor due to a disturbance voltage.

[0002]

2. Description of the Related Art FIG. 4A shows a resonance circuit. here,
VB is a power supply voltage supplied to the rectangular voltage generation circuit 402;
1 is a resonance circuit, C1 is a capacitor forming the resonance circuit 1, L1 is a coil forming the resonance circuit 1, and I1 is a current flowing through the resonance circuit 1 (hereinafter referred to as resonance current). V1 is a rectangular voltage generated by the rectangular voltage generating circuit 402 and used to drive the resonance circuit 1, and FIG.
As shown in the waveform example, 0V and the power supply voltage VB are alternately repeated.

In FIG. 4A, a switch 401 is inserted between a resonance circuit 1 and a rectangular voltage generation circuit 402. When a sufficient time has elapsed since the switch 401 was turned on, the resonance current I1 is in a steady state as shown in FIG. However, immediately after the switch 401 is turned on, the amplitude of the resonance current I1 fluctuates as shown in FIG. Reference numeral 501 shows an extracted amplitude fluctuation waveform of the resonance current I1 in a vibrating state. Reference numeral 502 denotes a maximum value of the amplitude fluctuation waveform 501, and reference numeral 503 denotes an amplitude fluctuation waveform 501.
Is the cycle of The frequency of the amplitude fluctuation waveform 501 is 50
It is given by the reciprocal of 3.

Similarly to the state where the switch 401 is turned on and off, when a disturbance voltage is applied to the circuit, the resonance current I
1 causes the amplitude to fluctuate. FIG. 6 shows an example of the circuit.
(A) and its waveform is shown in FIG. The disturbance voltage referred to here is a voltage generated from a voltage source other than the rectangular voltage V1, and in the case of FIG. 6, a pulse 602 of positive polarity is assumed. Reference numeral 601 denotes a disturbance voltage source that generates a pulse 602 of a positive polarity. As shown in FIG. 6B, the disturbance voltage source 60
Immediately after the 1 is applied, the fluctuation of the amplitude occurs (period 60).
3) As the time elapses, the steady state (period 60)
4).

As a conventional circuit for eliminating the amplitude fluctuation of the resonance current I1, a damping circuit as shown in FIG. 7 is known. This damping circuit includes a resonance circuit 1, a damping capacitor C2, a damping inductor L2, and a damping resistor R2. A resonance circuit 701 is constituted by C2 and L2, and C2 and L2 are set to a frequency at which damping is to be performed (hereinafter referred to as a damping frequency).
Set the value of. The damping frequency is given by the following equation.

[0006]

(Equation 1)

Therefore, at the damping frequency, the impedance of the resonance circuit 701 becomes almost 0, and at that time, the current is consumed by R2, and the current component having the damping frequency in the fluctuating current is reduced. Therefore, in the damping circuit, the amplitude fluctuation can be reduced by matching the frequency of the amplitude fluctuation waveform with the damping frequency.

[0008]

However, in the above-mentioned conventional damping circuit, power is consumed by the resistor, so that there is a problem that a power loss occurs and amplitude fluctuation cannot be sufficiently removed.

An object of the present invention is to provide an amplitude correction circuit which can eliminate the power loss at the resistor and sufficiently reduce the amplitude fluctuation in consideration of such problems in the conventional resonance circuit. And

[0010]

According to a first aspect of the present invention, there is provided a rectangular voltage generating circuit for generating a rectangular voltage for driving a resonance circuit having a coil and a capacitor, and the generated rectangular voltage is applied to the resonance circuit. A correction voltage generating means for generating a correction voltage for reducing amplitude fluctuations caused by a disturbance voltage generated in the current; and a power supply voltage modulation circuit for modulating a power supply voltage applied to the rectangular voltage generation circuit by the correction voltage. An amplitude correction circuit that modulates a power supply voltage applied to a rectangular voltage generation circuit with a correction voltage to correct a rectangular voltage applied to the resonance circuit, thereby reducing amplitude fluctuations occurring in a current of the resonance circuit.

According to a second aspect of the present invention, there is provided a rectangular voltage generation circuit for generating a rectangular voltage for driving a resonance circuit having a coil and a capacitor, and a disturbance voltage generated in a current flowing through the resonance circuit by applying the generated rectangular voltage. A correction voltage generating means for generating a correction voltage for reducing the resulting amplitude fluctuation, and an electromagnetic transmission means for transmitting the correction voltage to the resonance circuit, wherein the correction voltage is supplied via the electromagnetic transmission means. This is an amplitude correction circuit that reduces amplitude fluctuations that occur in the current of the resonance circuit by transmitting to the resonance circuit.

According to a fourth aspect of the present invention, there is provided a rectangular voltage generating circuit for generating a rectangular voltage for driving a resonance circuit having a coil and a capacitor, an electromagnetic transmission means for extracting a current flowing through the resonance circuit as a voltage, and the electromagnetic transmission means. Amplitude detection circuit that performs amplitude detection of the voltage extracted in step 1, an inversion circuit that inverts the polarity of the output voltage of the amplitude detection circuit, and power supply voltage modulation that modulates the power supply voltage applied to the rectangular voltage generation circuit by the output of the inversion circuit And a circuit for modulating a power supply voltage applied to the rectangular voltage generating circuit with an output of the inverting circuit to correct the rectangular voltage applied to the resonant circuit, thereby reducing an amplitude variation occurring in the current of the resonant circuit. .

According to a sixth aspect of the present invention, there is provided a rectangular voltage generating circuit for generating a rectangular voltage for driving a resonance circuit having a coil and a capacitor, an electromagnetic transmission means for extracting a current flowing through the resonance circuit as a voltage, and the electromagnetic transmission means. An amplitude detection circuit that performs amplitude detection of the voltage extracted in step 1, an inversion circuit that inverts the polarity of the output voltage of the amplitude detection circuit, and another electromagnetic transmission unit that transmits the output of the inversion circuit to the resonance circuit. And an amplitude correction circuit for transmitting an output of the inversion circuit to the resonance circuit via another electromagnetic transmission means, thereby reducing an amplitude fluctuation occurring in a current of the resonance circuit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment. (First Embodiment) FIG. 1A is a block diagram showing an amplitude correction circuit according to a first embodiment of the present invention. In FIG. 1A, reference numeral 101 denotes a rectangular voltage generation circuit that generates a rectangular voltage V1 using a power supply voltage 104. The rectangular voltage V1 is a voltage for driving the resonance circuit 1, and has a waveform in which 0V and the power supply voltage 104 are alternately repeated as shown in a waveform example in FIG. A power supply voltage modulation circuit 102 modulates the power supply voltage VB in proportion to the input voltage S1 and outputs a voltage 104. Reference numeral 103 denotes a pulse generation circuit as a correction voltage generation means, which generates an input pulse voltage S1 for a power supply voltage modulation circuit. The resonance circuit 1 includes a capacitor C1 and a coil L1. I1 is a current flowing through the resonance circuit 1 (resonance current). In FIG. 1A,
Although not shown, there is a disturbance voltage source that causes the amplitude of the resonance current I1 to fluctuate, as shown at 601 in FIG.

Next, the operation of the amplitude correction circuit of the above embodiment will be described with reference to the drawings.

The object of this embodiment is to reduce the amplitude fluctuation of the resonance current by generating and canceling the amplitude fluctuation of the phase opposite to the amplitude fluctuation of the resonance current caused by the disturbance voltage. That is, by inputting an appropriate pulse voltage S1, the power supply voltage VB is modulated by the power supply voltage modulation circuit 102, and the power supply voltage 104 supplied to the rectangular voltage generation circuit 101 is changed. The change in the voltage 104 results in a change in the rectangular voltage V1 for driving the resonance circuit 1, and the amplitude of the resonance current I1 fluctuates. The pulse voltage S1 is adjusted so that the amplitude fluctuation of the resonance current I1 due to the pulse voltage S1 and the amplitude fluctuation caused by the disturbance voltage cancel each other.
Is determined, the amplitude fluctuation of the resonance current I1 can be reduced.

The embodiment of FIG. 1 will be described below using the waveform example of FIG.

FIG. 8 shows a resonance current 803 having a variation in amplitude.
This is an example of correcting. 801 is an input voltage to the rectangular voltage generation circuit 101 before correction, 802 is a rectangular voltage V1 before correction, 803 is a resonance current I1 before correction, and 804 is a disturbance assumed in the present embodiment. Voltage,
805 is the pulse voltage S1, 806 is the input voltage to the rectangular voltage generation circuit 101 after the correction, 807 is the rectangular voltage V1 after the correction, and 808 is the resonance current I1 after the correction. 809 is a pulse voltage S1
This is another example.

Before the correction, since the pulse voltage S1 is not input, the output of the power supply voltage modulation circuit 102 outputs the power supply voltage VB as it is (waveform 801). Therefore, the output V1 of the rectangular voltage generation circuit 101 repeats 0 and VB like 802. If there is no disturbance voltage source,
The resonance current I1 is in a steady state and has a waveform like 808. However, when a disturbance voltage is input, the resonance current I1
Is in a vibrating state. 803 is an example of the resonance current I1 when there is a disturbance voltage 804 that periodically changes in voltage.
Shown in Reference numeral 803 repeats a vibration state and a steady state.

On the other hand, when the correction pulse 805 generated by the pulse generation circuit 103 is input to the power supply voltage modulation circuit 102, the power supply voltage modulation circuit 102
Output becomes a voltage of 810, and becomes like a waveform 806. Therefore, the output V1 of the rectangular voltage generation circuit 101 is 8
07, and the change in the amplitude of the output V1 (816
The part indicated by. Normally, the value of VB decreases to 810. ) Causes a new amplitude fluctuation of the resonance current I1. This pulse 8
By offsetting the amplitude fluctuation caused by 05 and the amplitude fluctuation caused by the disturbance voltage, the resonance current I1 becomes like 808, and the fluctuation of the amplitude is reduced.

Here, the pulse S1 is a pulse synchronized with the period of the disturbance voltage source. The pulse S1 is optimized so that the fluctuation of the amplitude of the resonance current 803 is minimized while referring to the resonance current 803 using a measuring device. The appropriate pulse. The parameters for determining the pulse include the width (812) and the amplitude (8
13), phase (811), fall time (814),
Rise time (815), polarity.

Next, as a specific example of this embodiment, a TV
A case where the invention is applied to sine wave deflection in a cathode ray tube of a receiver will be described. This sine wave deflection is to form a deflecting circuit with a resonance circuit and perform sine wave deflection with respect to conventional so-called sawtooth wave deflection (US Pat. No. 4,672,44).
No. 9).

FIG. 9A is a schematic diagram of a sine wave deflection circuit including crosstalk of a deflection magnetic field from a vertical deflection coil to a horizontal deflection coil. Here, 901 and 902 are components of the drive voltage generation circuit, and are switching FETs. Reference numeral 903 denotes a vertical pin correction circuit, that is, a power supply voltage modulation circuit. Reference numeral 904 denotes an output voltage of the vertical pin correction circuit, which is an input voltage of the drive voltage generation circuit. 9
05 is a resonance capacitor, 906 is a crosstalk of the deflection magnetic field from the vertical deflection coil to the horizontal deflection coil, 907 is a horizontal deflection coil, and 908 is an input voltage of a vertical pin correction circuit.

FIG. 9B shows a waveform example. 909 is 90
1, a gate signal 910 is a gate signal input to 902, and 911 is an input signal 908 input to the vertical pin correction circuit. 912 is a horizontal rate and 913 is a vertical rate.

As shown in FIG. 10, since the vertical deflection coil 1001 and the horizontal deflection coil 1002 intersect at right angles, their mutual coupling coefficient is zero and their mutual inductance is zero. However, it is difficult to exactly achieve the coupling coefficient 0, and the coupling coefficient exists in the actual deflection yoke. Therefore, the crosstalk 906 of the deflection magnetic field from the vertical deflection coil to the horizontal deflection coil cannot be avoided due to the performance of the deflection coil.

In the above-described configuration, the crosstalk 906 of the deflecting magnetic field acts as a disturbance voltage source, causing a change in the amplitude of the deflecting current. An example is shown at 1105 in FIG. This fluctuation in the amplitude has an adverse effect on the image at the top of the screen, and the image is output as the image sways. Here, 1101 is a vertical synchronization signal, 1102 is a vertical deflection pulse, 1103 is an input signal of a vertical pin correction circuit, and 1104 is a horizontal deflection current.

FIG. 12 shows an example of an implementation circuit to which the present invention is applied. The difference from FIG. 9 is that a pulse generation circuit 1204 is added. Reference numeral 1201 denotes a correction pulse voltage;
2 is an inverting circuit, and 1203 is a pulse voltage before being inverted by the inverting circuit. The inverting circuit 1202 is a circuit for inverting the polarity, and may be a common emitter circuit or the like.

FIG. 13 shows the input voltage 904 of the drive voltage generation circuit before and after the correction by the pulse voltage. Here, 1301 is a vertical synchronizing signal, 1302 is a voltage 904 before correction, 1303 is a pulse voltage 1203, and 1304 is a voltage 9 after correction.
04.

FIG. 14 shows the horizontal deflection current before and after the correction by the pulse voltage. (A) is a horizontal deflection current waveform before performing the correction, and (b) is a horizontal deflection current waveform after performing the correction. 1401 is a vertical synchronization signal, a horizontal deflection current waveform before 1402 performs correction,
Reference numeral 1403 denotes a horizontal deflection current waveform after the correction. As is clear from the figure, it can be confirmed that the amplitude fluctuation is considerably reduced.

Although the present embodiment has been described using the crosstalk of the deflection magnetic field from the vertical deflection coil to the horizontal deflection coil as the disturbance voltage, other discontinuous points of the input signal of the vertical pin correction circuit (see FIG. 11 (1106) may be a disturbance voltage. In this case, similarly, correction can be performed using the above-described pulse generation circuit. (Second Embodiment) FIG. 2A is a block diagram showing an amplitude correction circuit according to a second embodiment of the present invention. In FIG. 2A, reference numeral 201 denotes a rectangular voltage generation circuit, which has a power supply voltage VB.
Is a circuit that generates a rectangular voltage V1 by using The rectangular voltage V1 is a voltage for driving the resonance circuit 1, and an example of the waveform is shown in FIG. This is a waveform in which 0 V and the power supply voltage VB are alternately repeated. 202 is an electromagnetic transmission means. The electromagnetic transmission means 202 transmits the amplitude fluctuation correction pulse voltage S1 generated from the pulse generation circuit 203 as the correction voltage generation means to the resonance circuit 1. C1 is a capacitor forming the resonance circuit 1, and L1 is a coil forming the resonance circuit 1. I1 is a current flowing through the resonance circuit 1 (resonance current). In FIG. 2A, a disturbance voltage source which causes a change in the amplitude of the resonance current I1 as shown at 601 in FIG. 6 is not shown, but is present.

FIG. 2B shows a specific example of the electromagnetic transmission means 202 when a transformer is used. FIG.
In FIG. 2B, reference numeral 204 denotes a transformer.

In the following, using the waveform example of FIG.
A configuration example of (b) will be described.

FIG. 15 shows a resonance current 15 having a variation in amplitude.
02 is an example of correcting the “02”. 1501 is a waveform of V1-V2 before correction, 1502 is a resonance current I1 before correction, 1503 is a disturbance voltage assumed in this embodiment, 1504 is a pulse voltage S1, and 1505 is after correction. Waveform of voltage V2 (see FIG. 2B), 1508
Is an amplitude value of the pulse voltage of 1505, 1506 is a waveform of the rectangular voltage V1-V2 after the correction, and 1507 is a resonance current I1 after the correction.

Before the correction, the pulse voltage S1 is not input, so that the voltage V2 becomes 0 [V]. Therefore, the potential difference between the outputs V1 and V2 of the rectangular voltage generation circuit 201 is 15
0 and VB are repeated like 01. When there is no disturbance voltage source, the resonance current I1 is in a steady state,
It becomes a waveform like 07. However, when a disturbance voltage is input, the resonance current I1 is in an oscillating state. Reference numeral 1502 denotes an example of the resonance current I1 when there is a disturbance voltage 1503 that periodically changes in voltage. 1502 repeats a vibration state and a steady state.

On the other hand, when the correction pulse 1504 generated by the pulse generation circuit 203 is transmitted using the transformer 204, the voltage value of V2 becomes 1508 only during the period when the pulse exists.
, And a waveform 1505 is obtained. Therefore, V1-V2 becomes like 1506, and this output V1-V2 is obtained.
The change in the amplitude of V2 (the portion indicated by 1509; the value of VB usually decreases to VB-1508) is newly added to the resonance current I1.
Causes amplitude fluctuations. By canceling the amplitude fluctuation caused by the pulse 1504 and the amplitude fluctuation caused by the disturbance voltage, the resonance current I1 becomes as shown by 1507, and the fluctuation of the amplitude is reduced.

Here, the pulse S1 is a pulse synchronized with the period of the disturbance voltage source. The pulse S1 is optimized so that the fluctuation of the amplitude of the resonance current 1502 is minimized while referring to the resonance current 1502 using a measuring device. The appropriate pulse. Third Embodiment FIG. 3A is a block diagram showing an amplitude correction circuit according to a third embodiment of the present invention. In FIG. 3A, reference numeral 301 denotes a rectangular voltage generation circuit;
This is a circuit that generates a rectangular voltage V1 using the power supply voltage 306. The rectangular voltage V1 is a voltage for driving the resonance circuit 1, and FIG. 3B shows a waveform example thereof. This is a waveform in which 0 V and the power supply voltage 306 are alternately repeated. A power supply voltage modulation circuit 302 modulates the power supply voltage VB in proportion to the input voltage 309 and outputs a voltage 306. 303 is an electromagnetic transmission means. Resonant current I1 flowing through resonance circuit 1
Is converted to a voltage 307 and transmitted to the amplitude detection circuit 304. The voltage 308 output from the amplitude detection circuit 304
Is input to the inversion circuit 305 and output as the polarity inversion voltage 309. C1 is a capacitor forming the resonance circuit 1, and L1 is a coil forming the resonance circuit 1. Note that, in FIG. 3A, the resonance current I as indicated by 601 in FIG.
Although a disturbance voltage source that causes the amplitude of 1 to fluctuate is not shown, it exists.

Next, the operation of the amplitude correction circuit of the above embodiment will be described with reference to the drawings.

The present embodiment aims at reducing the amplitude fluctuation of the resonance current by detecting the fluctuation of the amplitude of the resonance current caused by the disturbance voltage, and causing the resonance current to generate a vibration having a phase opposite to the detected waveform. . By inputting the detection waveform of the amplitude fluctuation of the resonance current and the waveform of the opposite phase,
The power supply voltage VB is modulated by the power supply voltage modulation circuit 302, and the power supply voltage 30 supplied to the rectangular voltage generation circuit 301 is modulated.
6 is changed. The change in the voltage 306 results in a change in the rectangular voltage V1 for driving the resonance circuit 1, and the amplitude of the resonance current I1 fluctuates. The amplitude fluctuation of the resonance current I1 due to the detection waveform and the amplitude fluctuation caused by the disturbance voltage cancel each other, thereby reducing the amplitude fluctuation of the resonance current I1.

In the following, using the waveform example of FIG.
The embodiment (a) will be described.

FIG. 16 shows a resonance current 16 having an amplitude fluctuation.
03 is an example of correcting 03. Reference numeral 1601 denotes input voltages 306 and 160 to the rectangular voltage generation circuit 301 before correction is performed.
2 is a rectangular voltage V1 before correction, 1603 is a resonance current I1 before correction, 1604 is a disturbance voltage assumed in the present embodiment, 1605 is detection waveforms 308, 160
Reference numerals 6 and 1607 denote input voltages 306 and 1607 to the rectangular voltage generating circuit 301 after correction, and reference numerals 1608 and 1608 denote resonance currents I1 after correction.

Since the detection waveform 308 is not output before the correction, the power supply voltage modulation circuit 302 outputs the power supply voltage VB as it is (waveform 1601). Therefore, the output V1 of the rectangular voltage generation circuit 301 repeats 0 and VB as indicated by 1602. When there is no disturbance voltage source, the resonance current I1 is in a steady state and has a waveform like 1608. However, when a disturbance voltage is input, the resonance current I1 is in an oscillating state. Reference numeral 1603 denotes an example of the resonance current I1 when there is a disturbance voltage 1604 that periodically changes in voltage. Reference numeral 1603 repeats a vibration state and a steady state.

On the other hand, a waveform 3 obtained by inverting the detection waveform 308
When 09 is input to the power supply voltage modulation circuit 302, the input voltage 306 to the rectangular voltage generation circuit 301 has a waveform 1606. Therefore, the output V of the rectangular voltage generation circuit 301
1 becomes 1607, and the change in the amplitude of the output V1 causes a new fluctuation in the amplitude of the resonance current I1. Since the amplitude fluctuation caused by the detection waveform 308 and the amplitude fluctuation caused by the disturbance voltage cancel each other, the resonance current I1 becomes 1608.
And the fluctuation of the amplitude is reduced.

In the example of FIG. 16, for simplification of the drawing, the frequency of the resonance current 1603 is shown as twice the frequency of the waveform 1605 obtained by extracting the amplitude fluctuation waveform by the detection circuit. In the correction circuit, the resonance current I1
Is assumed to be 10 times or more of the detection waveform 1605, so that it is sufficiently possible to perform detection using the amplitude detection circuit 304.

FIG. 17 shows a specific configuration example of the present embodiment. 3A is different from FIG.
Is limited to the transformer 1701 and the transformer 1
The point is that a capacitor 1702 is inserted between the 701 and the amplitude detection circuit. The capacitor 1702 is connected to the transformer 17
A resonance circuit 1703 is formed together with the secondary side of 01, and its value is set so as to resonate at the frequency of the fluctuation of the amplitude of the resonance current (the frequency of the waveform 1605 in FIG. 16). The configuration example of FIG. 17 is effective when the frequency of the fluctuation of the amplitude of the resonance current can be predicted in advance. The waveform resonated by the resonance circuit 1703 makes it easy to perform detection, and the amplitude of the resonance current becomes more accurate. Can be extracted.

FIG. 18 shows another configuration example of the present embodiment. 3A is different from FIG.
An amplifier 1801 is inserted between the amplitude detection circuit 304 and the amplitude detection circuit 304. The amplifier 1801 includes an amplitude detection circuit 304
It is intended to facilitate the detection performed in the above. Even if the voltage obtained by the electromagnetic transmission means 303 is very small and detection by the amplitude detection circuit 304 is difficult, the amplifier 1801
Facilitates detection by amplifying at
It is possible to extract an accurate waveform of the fluctuation of the amplitude of the resonance current.

FIG. 19A shows another example of the structure.
3A is different from FIG. 3A in that a waveform having the opposite polarity to the waveform obtained by the amplitude detection circuit 304 is not input to the power supply voltage modulation circuit, but another electromagnetic transmission means 1901 is used for the electromagnetic transmission means 303. Is transmitted to the resonance circuit 1 via the

[0047]

As is apparent from the above description, the present invention has the advantage that the power loss caused by consuming power by the resistor can be eliminated and the change in the amplitude of the resonance current due to the disturbance voltage source can be sufficiently reduced. Having.

[Brief description of the drawings]

FIG. 1A is a block diagram illustrating an amplitude correction circuit according to a first embodiment of the present invention, and FIG. 1B is a diagram illustrating an example of a V1 voltage;

FIG. 2A is a block diagram illustrating an amplitude correction circuit according to a second embodiment of the present invention, and FIG. 2B is a diagram illustrating a specific circuit thereof.

FIG. 3A is a block diagram illustrating an amplitude correction circuit according to a third embodiment of the present invention, and FIG. 3B is a diagram illustrating an example of a V1 voltage;

FIG. 4A is a diagram illustrating a resonance circuit, and FIG. 4B is a diagram illustrating a V1 voltage example.

5A is a diagram showing waveforms in the resonance circuit of FIG. 4 in a steady state, and FIG. 5B is a diagram showing each waveform of the resonance circuit in FIG. 4 when a switch is on. It is a figure showing a waveform.

FIG. 6A is a diagram illustrating a resonance circuit when a disturbance voltage source is present, and FIG. 6B is a diagram illustrating waveforms when the disturbance voltage source is present.

FIG. 7 is a configuration diagram showing a conventional amplitude correction circuit (damping circuit).

FIG. 8 is a diagram showing a waveform example for explaining the first embodiment.

9A is a diagram showing a sine wave deflection circuit before embodying the present invention, and FIG. 9B is a diagram showing each waveform of the circuit.

FIG. 10 is a diagram illustrating crosstalk of a deflection yoke.

FIG. 11 is a diagram showing waveforms in the circuit of FIG. 9A.

FIG. 12 is a diagram showing a sine wave deflection circuit when the present invention is applied to the circuit of FIG. 9A.

13A is a diagram showing each waveform of a sine wave deflection circuit before implementing the present invention in the configuration of FIG. 12, and FIG. 13B is a diagram showing a sine wave when the present invention is implemented; FIG. 3 is a diagram illustrating each waveform of a deflection circuit.

14A shows a horizontal deflection current waveform before the present invention is implemented in the configuration of FIG. 12, and FIG. 14B shows a horizontal deflection current waveform when the present invention is implemented; FIG.

FIG. 15 is a diagram showing an example of each waveform in the embodiment of FIG. 2 (b).

FIG. 16 is a diagram showing each waveform example in the embodiment of FIG. 3A.

FIG. 17 is a diagram showing another configuration example according to the third embodiment.

FIG. 18 is a diagram showing another configuration example according to the third embodiment.

FIG. 19 is a diagram showing another configuration example in the third embodiment.

[Explanation of symbols]

 Reference Signs List 1 resonance circuit 101, 201, 301, 402 rectangular voltage generation circuit 102, 302 power supply voltage modulation circuit 103, 203 pulse generation circuit 202, 303 electromagnetic transmission means 204 transformer 304 amplitude detection circuit 305 inversion circuit 401 switch 601 disturbance voltage source 603 vibration State period 604 Steady state period 811 Pulse phase (delay time) 812 Pulse width 813 Pulse amplitude 814 Pulse fall time 815 Pulse rise time 903 Vertical pin correction circuit 905 Resonance capacitor 907 Horizontal deflection coil 1001 Vertical deflection coil 1002 Horizontal deflection coil 1101 Vertical synchronization signal 1102 Vertical deflection pulse 1202 Inversion circuit 1204 Pulse generation circuit 1801 Amplifier

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyoshi Shimosaka 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C068 AA06 AA11 AA20 BA08 BA09 BA30 CA10 JA03 LA20

Claims (6)

[Claims] 1. A rectangular voltage generating circuit for generating a rectangular voltage for driving a resonant circuit having a coil and a capacitor, and an amplitude variation caused by a disturbance voltage generated in a current flowing in the resonant circuit by applying the generated rectangular voltage. A correction voltage generating means for generating a correction voltage for reduction, and a power supply voltage modulation circuit for modulating a power supply voltage to be applied to the rectangular voltage generation circuit by the correction voltage, and a power supply to be applied to the rectangular voltage generation circuit An amplitude correction circuit that modulates a voltage with the correction voltage to correct a rectangular voltage applied to the resonance circuit, thereby reducing amplitude fluctuations occurring in a current of the resonance circuit. 2. A rectangular voltage generating circuit for generating a rectangular voltage for driving a resonance circuit having a coil and a capacitor, and an amplitude fluctuation caused by a disturbance voltage generated in a current flowing through the resonance circuit by applying the generated rectangular voltage. A correction voltage generating means for generating a correction voltage for reduction, and an electromagnetic transmission means for transmitting the correction voltage to the resonance circuit, wherein the correction voltage is transmitted through the electromagnetic transmission means. An amplitude correction circuit for reducing amplitude fluctuations occurring in a current of the resonance circuit by transmitting the current to the resonance circuit. 3. The amplitude correction circuit according to claim 1, wherein the correction voltage is a pulse voltage having an opposite phase synchronized with a previously assumed period of a disturbance voltage. 4. A rectangular voltage generation circuit for generating a rectangular voltage for driving a resonance circuit having a coil and a capacitor, an electromagnetic transmission means for extracting a current flowing through the resonance circuit as a voltage, An amplitude detection circuit for performing amplitude detection, an inversion circuit for inverting the polarity of the output voltage of the amplitude detection circuit, and a power supply voltage modulation circuit for modulating a power supply voltage applied to the rectangular voltage generation circuit by an output of the inversion circuit Modulating a power supply voltage applied to the rectangular voltage generating circuit with an output of the inverting circuit to correct a rectangular voltage applied to the resonant circuit, thereby reducing an amplitude variation occurring in a current of the resonant circuit. Amplitude correction circuit. 5. The amplitude correction circuit according to claim 4, further comprising an amplifier between said electromagnetic transmission means and said amplitude detection circuit for amplifying a voltage extracted from a current of said resonance circuit. 6. A rectangular voltage generating circuit for generating a rectangular voltage for driving a resonant circuit having a coil and a capacitor, electromagnetic transmitting means for extracting a current flowing through the resonant circuit as a voltage, An amplitude detection circuit for performing amplitude detection, an inversion circuit for inverting the polarity of an output voltage of the amplitude detection circuit, and another electromagnetic transmission means for transmitting an output of the inversion circuit to the resonance circuit. An amplitude correction circuit for transmitting an output of the inverting circuit to the resonance circuit via the electromagnetic transmission means, thereby reducing an amplitude fluctuation occurring in a current of the resonance circuit.