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1. 发明专利

JP2000308363A MULTICHANNEL INVERTER 失效
公开(公告)号：JP2000308363A
公开(公告)日：2000-11-02
申请号：JP10908799
申请日：1999-04-16
申请人： TOKO INC
发明人： ARAKAWA KOJI
IPC分类号： H02M7/48 , H02M7/538 , H05B41/24
摘要： PROBLEM TO BE SOLVED: To obtain a multichannel inverter by which a plurality of discharge tubes can be turned on simultaneously, without generating flickers and whose shape can be reduced as a whole so as to be lightweight and to easily turn on the discharge tubes by the inverter. SOLUTION: A plurality of resonance power supply circuits RS1 to RS4 which are constituted respectively of step-up transformers, resonance capacitors and switching transistors are provided. The transistors are driven near the resonance frequency of the resonance power supply circuits. All inverters 10 to 13 are driven at the same timing. A plurality of discharge tubes DS1 to DS4 on the secondary side of the step-up transformers in the resonance power supply circuits RS1 to RS4 are turned on by high-frequency voltages at the same frequency. When the inverters 10 to 13 are started, they are driven in a short time at a frequency which is lower than the resonance frequency by taking into consideration that the discharge tubes are easily turned on. When the discharge tubes are abnormal, the turning-on operations of all the discharge tubes are stopped by using the output of an OR circuit as the abnormal signal of every discharge tube.

2. 发明专利

JPH11299248A INVERTER CIRCUIT 失效
公开(公告)号：JPH11299248A
公开(公告)日：1999-10-29
申请号：JP11601598
申请日：1998-04-10
申请人： TOKO INC
发明人： ARAKAWA KOJI
IPC分类号： H05B41/24 , H02M7/48 , H03H7/01 , H05B41/392
摘要： PROBLEM TO BE SOLVED: To provide an inverter circuit which can set the time of the beginning of lighting in the first and second operating modes respectively, eliminate the lighting error of a fluorescent light in the first mode, and improve the accuracy of modulation of the light in the second mode. SOLUTION: A time constant circuit consisting of a resistor R1 for setting the time of the beginning of lighting in the first mode mainly and a capacitor C1, and a time constant circuit which consists of a resistor R2 for setting the time of the beginning of the lighting in the second mode mainly and a capacitor C2 are parallel-connected to the control terminal 11 for controlling the discharging current of a frequency modulator 6. In a first mode, an oscillating frequency fosc of the frequency modulator 6 gradually decreases to a frequency f1 in a stable lighting condition, therefore the time at the beginning of the lighting gets longer. In a second mode, the oscillating frequency fosc rapidly decreases to the frequency f1 , as compared with the first mode, the time at the beginning of the lighting becomes shorter.

3. 发明专利

JPH09260076A LIGHTING DIMMING CIRCUIT FOR COLD CATHODE FLUORESCENT LAMP 失效
公开(公告)号：JPH09260076A
公开(公告)日：1997-10-03
申请号：JP9321496
申请日：1996-03-22
申请人： TOKO INC
发明人： ARAKAWA KOJI , KOGA TOMOYUKI
IPC分类号： H05B41/24 , H05B41/282 , H05B41/392 , H05B41/29
摘要： PROBLEM TO BE SOLVED: To improve the overall efficiency by simplifying the circuit structure to light and dim a fluorescent lamp with a waveform similar to a sine wave with less harmonics based on the parasitic element. SOLUTION: A DC-AC converter is formed of a voltage resonator of only one switching element, the current resonance is occurred when the switching element is 'on', to pulse width modulate in a range narrower than the half of the cycle of current resonance frequency, to adjust the AC current level of the DC-AC converter output to approximate to sin wave to ignite and dim a fluorescent lamp 1. The switching element is served by a transistor Q1.

4. 发明专利

JPH06121535A AC-DC CONVERTER 失效
公开(公告)号：JPH06121535A
公开(公告)日：1994-04-28
申请号：JP28931292
申请日：1992-10-02
申请人： TOKO INC
发明人： ARAKAWA KOJI
IPC分类号： H02M3/28 , H02M7/06 , H02M7/12
摘要： PURPOSE:To minimize increase of outline and cost while ensuring positive starting by simplifying the circuitry of an improved power factor AC-DC converter. CONSTITUTION:In an AC-DC converter comprising a rectifier circuit 8, a booster type converter circuit 9, and a DC-DC converter circuit, driving power is fed to both a DC-DC converter control circuit 3 and booster converter control circuit 2 from a winding N3 of a converter transformer 4 in the DC-DC converter circuit 9. When the AC-DC converter is started, the DC-DC converter 10 is operated at first followed by operation of the booster converter circuit 9. This constitution minimizes increase in the outline and cost of the AC-DC converter. Furthermore, the AC-DC converter can be started positively.

5. 发明专利

JPH05328727A AC-DC CONVERTER 失效
公开(公告)号：JPH05328727A
公开(公告)日：1993-12-10
申请号：JP15565092
申请日：1992-05-22
申请人： TOKO INC
发明人： ARAKAWA KOJI
IPC分类号： G05F1/70 , H02M1/15 , H02M3/28 , H02M7/12 , H02M7/21
摘要： PURPOSE:To improve a power factor and reduce the occurrence of voltage distortion or higher harmonics at power supply line without making a complicated circuit configuration and without increasing the shape. CONSTITUTION:A step-down type DC-DC converter 9 is connected to a rectifier 1 at the, input side, and an output current is of the rectifier 1 flows only in the time period when the output voltage V3 of the rectifier 1 is higher than the voltage V4 of an output capacitor C4 of DC-DC converter 9. By doing this, the power factor can be improved without using an active filter, and the occurrence of harmonics or voltage distortion of a power supply line can be reduced. Compared to the case of using the active filter, the shape of a choke coil of the input circuit can be reduced, and this is advantageous for reducing the shape of the AC-DC converter.

6. 发明专利

JPS583833B2 失效
公开(公告)号：JPS583833B2
公开(公告)日：1983-01-22
申请号：JP4968579
申请日：1979-04-24
申请人： TOKO INC
发明人： NAKAMURA KATSURO , ARAKAWA KOJI , SAKURAI MASAO
IPC分类号： B41J2/28

7. 发明专利

JP2003068480A Dimmer control circuit 有权
标题翻译：调光器控制电路
公开(公告)号：JP2003068480A
公开(公告)日：2003-03-07
申请号：JP2001254128
申请日：2001-08-24
申请人： Toko Inc , 東光株式会社
发明人： ARAKAWA KOJI , KOGA TOMOYUKI
IPC分类号： H05B37/02
摘要： PROBLEM TO BE SOLVED: To provide a control circuit which can cope with analog dimmer and digital dimmer. SOLUTION: A dimmer control signal from the outside is inputted into a (+) terminal of an error amplifier OP1 via the first circuit to set the maximum value of an LED current IL. A signal corresponding to the LED current IL is inputted into the (-) terminal of the error amplifier OP1. Then, the second circuit to set the minimum value of the LED current by emitting a signal is connected with the output part of the error amplifier OP1 (output terminal on the chart) when the light control signal is lower than prescribed.
摘要翻译：要解决的问题：提供可以应付模拟调光器和数字调光器的控制电路。解决方案：来自外部的调光控制信号经由第一电路输入到误差放大器OP1的（+）端，以设置LED电流IL的最大值。对应于LED电流IL的信号被输入到误差放大器OP1的（ - ）端。然后，当光控制信号低于规定值时，通过发出信号来设定LED电流的最小值的第二电路与误差放大器OP1（图表上的输出端子）的输出部分连接。

8. 发明专利

JP2002186252A CONTROL CIRCUIT OF PIEZOELECTRIC TRANSFORMER 失效
公开(公告)号：JP2002186252A
公开(公告)日：2002-06-28
申请号：JP2000378743
申请日：2000-12-13
申请人： TOKO INC
发明人： ARAKAWA KOJI , TAKAHASHI TOSHIHIRO , INOKUCHI TAKAHIRO , UMEKI TAKAHIRO
IPC分类号： H05B41/24 , H02M3/155 , H02M3/24 , H02M7/48 , H02M7/537
摘要： PROBLEM TO BE SOLVED: To obtain a piezoelectric transformer in which discharge can be started smoothly when the discharge start voltage of a cathode ray tube is increased, deterioration of a component or discharge due to open circuit or short circuit on the secondary electrode side of the piezoelectric transformer is prevented, and heating of a drive switch can be prevented. SOLUTION: The control circuit for a piezoelectric transformer comprises at least one of a circuit for returning the drive frequency back to an upper limit and then lowering it gradually when a voltage not lower than a preset level is detected at the secondary electrode side of the piezoelectric transformer, and a circuit for stopping operation of a drive circuit when a preset firing current can not be obtained from the secondary electrode.

9. 发明专利

JPH07272951A INDUCTANCE ELEMENT 失效
公开(公告)号：JPH07272951A
公开(公告)日：1995-10-20
申请号：JP8734594
申请日：1994-03-31
申请人： TOKO INC
发明人： ARAKAWA KOJI , ISHII IZUMI , SASAMORI KUNIO
IPC分类号： H01F27/29
摘要： PURPOSE:To prevent metal-sheet terminals from being stripped off from a drum-shaped core even when heat is applied by a method wherein recessed parts having a depth in the axial direction are formed in the bottom face of the drum-shaped core, tail parts which have been bent respectively vertically are formed at the metal-sheet terminals and the tail parts for the metal-sheet terminals are bonded to, or force-fitted to, the recessed parts in the drum-shaped core. CONSTITUTION:One pair of metal-sheet terminals 15A, 15B are fixed to the bottom face of a drum-shaped core 13 having a winding groove 12 between flange 11 and a flange 11. Tail parts 16 are formed at the metal-sheet terminals 15A, 15B in such a way that ends, on one side, of respective slender metal sheets are bent vertically over the whole width. In addition, recessed parts 18A, 18B having a depth in the axial direction of the drum-shaped core 13 are formed in the rear of the flange 11 on the lower side as the bottom face of the drum-shaped core 13. The tail part 16 for the metal-sheet terminal 15A is inserted into the recessed part 18A and the tail part 16 for the metal-sheet terminal 15B is inserted into the recessed part 16B so as to be fixed by an adhesive.

10. 发明专利

JPH07135774A AC-DC CONVERTER 失效
公开(公告)号：JPH07135774A
公开(公告)日：1995-05-23
申请号：JP4507894
申请日：1994-02-21
申请人： TOKO INC
发明人： ISHII MASANORI , ARAKAWA KOJI
IPC分类号： H02M7/217 , H02M1/42 , H02M3/155 , H02M3/28 , H02M3/335 , H02M7/06 , H02M7/12
摘要： PURPOSE:To provide an AC-DC converter which has a wide applicable AC input voltage range by a method wherein the increase of the voltage in a circuit at the time of a light load is suppressed. CONSTITUTION:A PWM circuit 6, a one-shot multivibrator 7, a pulse synthesizing circuit 8 and a comparing circuit 9 are provided in an AC-DC converter which is composed of a rectifier 3, a step-up chopper circuit 4 and a DC-DC converter circuit 5. The PWM circuit 6 generates a first pulse signal Vps and the one-shot multivibrator 7 generates a delay pulse VpD. In accordance with the first pulse signal Vpa and the delay pulse VpD, the pulse synthesizing circuit 8 generates a second pulse Vpa whose width is smaller than the width of the first pulse signal Vpa by the width of the delay pulse VpD. The comparator circuit 9 compares a voltage Vc which is stepped up by the step-up chopper circuit 4 with a reference voltage VREF and, if the voltage Vc is declined below the reference voltage VREF the generation of the delay pulse is stopped.

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