JP2005039050A - Power supply apparatus and wire-wound transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire-wound transformer adapted to an optional primary resonance frequency by increasing a resonance frequency of the wire-wound transformer for a high voltage output without decreasing the number of secondary windings. <P>SOLUTION: A primary resonance circuit is configured by connecting a resonance capacitor C1 to a primary winding 40 of the wire-wound transformer 44. The primary side of the 44 is connected to a control circuit for driving a plurality of switching elements, a primary resonance voltage is extracted from the primary resonance circuit to apply a primary resonance phase signal whose phase is matched with that of a primary resonance current to cause self-oscillation to the control circuit, thereby exciting the wire-wound transformer 44. An air gap 24 formed to the core 2 of the wire-wound transformer 44 corresponding to the resonance frequency of the primary resonance circuit increases the resonance frequency of the wire-wound transformer 44 itself. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power supply device for driving a load such as a cold cathode fluorescent lamp, and a high-voltage output winding transformer used in the power supply device.

When supplying a high voltage from a winding transformer, such as lighting a CCFL tube (cold cathode tube), the number of secondary windings of the winding transformer is increased so that a high voltage is output from the winding transformer. I have to. When a fluorescent lamp such as a CCFL tube is driven by a high voltage output winding transformer, a ballast capacitor is used to absorb voltage fluctuations of the winding transformer. Further, a power supply device is known in which a ballast capacitor is omitted by using a leakage transformer in which the degree of coupling between the secondary winding and the primary winding is sparse, and two discharge lamps are driven simultaneously (for example, Patent Document 1). reference).
In addition, in order to form a leakage gap in the core, there is known one in which a protrusion is specially prepared (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 2002-75756 (paragraph 0012, FIG. 11) JP 2001-148318 A (paragraph 0007, FIG. 3)

  In order to obtain a high voltage output, the number of secondary windings must be increased. As an example, if each of the two secondary windings is 1500 turns, the transformer has 3000 turns of secondary windings. Number. As described above, when the number of turns of the secondary winding increases, the resonance frequency of the transformer itself decreases. In general, if the primary side is switched at 50 KHZ and the primary side is to resonate at 50 KHZ, the resonant frequency of the transformer itself must be higher. Usually set to more than double (100KHZ or more).

If this state cannot be realized after 3000 turns, the number of turns of the secondary winding must be reduced. Also, when driving a fluorescent lamp such as a CCFL tube with the output of a high voltage output transformer, it is necessary to use a leakage transformer to omit the ballast capacitor and increase the voltage applied to the fluorescent lamp. Is special in structure and expensive. Therefore, the conventional leakage transformer has a problem that it is not suitable for driving a large number of loads with one transformer.
The present invention aims to solve the above problems.

  In order to achieve the above object, according to the present invention, a primary resonance circuit is configured by connecting a resonance capacitor to a primary side winding of a winding transformer, and a control for driving a plurality of switching elements on the primary side of the winding transformer. A primary resonance phase signal obtained by extracting a primary resonance voltage from the primary resonance circuit and aligning the phase with the primary resonance current is supplied to the control circuit to cause the control circuit to perform a self-excited oscillation operation. In the power supply device configured to drive the winding transformer, a gap is provided in the core of the winding transformer corresponding to the primary resonance frequency to increase the resonance frequency of the winding transformer itself.

  In addition, the present invention relates to a pair of E-type cores or E-type and I-type cores, and three longitudinal core portions that are parallel to each other with a predetermined distance therebetween, and an appropriate position of the longitudinal core portion. Right-angled core parts on both sides are formed integrally, and a primary winding and two or more secondary windings are installed at appropriate positions on the core part to constitute a winding transformer for high voltage output with one input and multiple outputs. In addition, a gap for frequency correction for increasing the resonance frequency of the wound transformer itself is provided at an appropriate position of the core portion.

According to the present invention, a leakage gap is provided at an appropriate position of the core portion.
In addition, the present invention relates to a pair of E-type cores or E-type and I-type cores, and three longitudinal core portions that are parallel to each other with a predetermined distance therebetween, and an appropriate position of the longitudinal core portion Right-angled core parts on both sides are formed integrally, and a primary winding and two or more secondary windings are installed at appropriate positions on the core part to constitute a winding transformer for high voltage output with one input and multiple outputs. In addition, a gap having both functions for leakage and for frequency correction for increasing the resonance frequency of the winding transformer itself is provided at an appropriate position of the core portion.

  The present invention also provides a pair of E-type cores or E-type and I-type cores, and three longitudinal core portions that are parallel to each other at a predetermined interval, and perpendicular to the longitudinal core portions. The core part is formed integrally with each other, and a primary winding and two or more secondary windings are installed at appropriate positions of the core part to form a one-input multiple-output high-voltage output winding transformer. Then, a gap for frequency correction for increasing the resonance frequency of the winding transformer itself is provided at an appropriate position of the core portion, and a resonance capacitor is connected to the primary side winding of the winding transformer to form a primary resonance circuit. And the primary side of the wire wound transformer is connected to a control circuit for driving a plurality of switching elements, and the primary resonance voltage is extracted from the primary resonance circuit and phased to the primary resonance current. Supply a phase signal to the control circuit to self-excited the control circuit It is obtained so as to drive the wire-wound transformer is operated.

  The present invention also provides a pair of E-type cores or E-type and I-type cores, and three longitudinal core portions that are parallel to each other at a predetermined interval, and perpendicular to the longitudinal core portions. The core part is formed integrally with each other, and a primary winding and two or more secondary windings are mounted at appropriate positions of the core part to constitute a winding transformer for high voltage output with one input and multiple outputs. A gap for correcting the frequency for increasing the resonance frequency of the winding transformer itself is provided at an appropriate position of the core portion, and a resonance capacitor is connected to the primary side winding of the winding transformer to constitute a primary resonance circuit. The primary side of the wound transformer is connected to a control circuit that drives a plurality of switching elements, and the primary resonance phase is obtained by extracting the primary resonance voltage from the primary resonance circuit and matching the phase with the primary resonance current. A signal is supplied to the control circuit and the control circuit is self-excited. The winding transformer is driven, and one electrode of the first fluorescent lamp is directly connected to the secondary high-voltage output terminal of the winding transformer without a ballast capacitor. A second fluorescent lamp is connected in series with the lamp, and the second fluorescent lamp is directly connected to the other secondary high-voltage output terminal of the winding transformer without a ballast capacitor.

  The present invention also provides a pair of E-type cores or E-type cores and I-type cores connected to each other and three longitudinal core portions parallel to each other at a predetermined interval, and perpendicular to the longitudinal core portions. The core portions are formed integrally with each other, the primary winding is mounted on the middle longitudinal core portion of the longitudinal core portions, and the outer longitudinal core portion sandwiching the middle core portion is disposed on the outer core portion. A single-input multiple-output high-voltage output winding transformer is configured by mounting one or more secondary windings, respectively, to increase the resonance frequency of the winding transformer itself at an appropriate position in the core portion. A space is provided.

  The present invention also provides a pair of E-type cores or E-type cores and I-type cores connected to each other and three longitudinal core portions parallel to each other at a predetermined interval, and perpendicular to the longitudinal core portions. And a primary winding is mounted in the middle of the middle longitudinal core portion of the longitudinal core portions, and the secondary windings are arranged on both sides of the middle primary winding, respectively. A winding-type transformer for high-voltage output with one input and multiple outputs is constructed by installing a winding, and a gap is provided in the middle of the longitudinal core portion in the middle to increase the resonance frequency of the winding-type transformer itself. is there.

  The present invention also provides a pair of E-type cores or E-type cores and I-type cores connected to each other and three longitudinal core portions parallel to each other at a predetermined interval, and perpendicular to the longitudinal core portions. The cores are formed integrally with each other, the primary winding is mounted on the middle longitudinal core portion of the longitudinal core portions, and the outer longitudinal core sandwiching the middle longitudinal core portion. One or more secondary windings are attached to each part to constitute a one-input multiple-output high-voltage output winding transformer, and the resonant frequency of the winding transformer itself is increased at an appropriate position in the core part. A primary resonance circuit is configured by connecting a resonance capacitor to the primary side winding of the winding transformer, and the primary side of the winding transformer is used as a control circuit for driving a plurality of switching elements. Connected to the primary resonant circuit It was supplied to the primary resonance phase signal in phase with the primary resonant current is taken out a voltage to the control circuit the control circuit is operated self-oscillation that so as to drive the wire-wound transformer.

  The present invention also provides a pair of E-shaped cores or I-shaped cores, three longitudinal core portions that are parallel to each other at a predetermined interval, and both core portions that are perpendicular to the longitudinal core portions. And the primary winding is mounted on the middle longitudinal core portion of the longitudinal core portions, and 1 is respectively disposed on the outer longitudinal core portion sandwiching the middle longitudinal core portion. Two or more secondary windings are mounted to form a one-input multiple-output high-voltage output winding transformer, and a gap for increasing the resonance frequency of the winding transformer itself is provided at an appropriate position of the core portion. Providing a primary resonance circuit by connecting a resonance capacitor to a primary winding of the winding transformer, and connecting a primary side of the winding transformer to a control circuit for driving a plurality of switching elements, The primary resonant voltage is taken from the primary resonant circuit. A primary resonance phase signal that is phase-matched to the primary resonance current is supplied to the control circuit to cause the control circuit to self-oscillate to drive the winding transformer, and one of the first fluorescent lamps Are directly connected to the secondary high-voltage output terminal of the winding transformer without a ballast capacitor, a second fluorescent lamp is connected in series with the first fluorescent lamp, and the second fluorescent lamp is connected The ballast capacitor is directly connected to the other secondary side high voltage output terminal without interposing a ballast capacitor.

  The present invention also provides a pair of E-type cores or E-type cores and I-type cores connected to each other and three longitudinal core portions parallel to each other at a predetermined interval, and perpendicular to the longitudinal core portions. The cores are formed integrally with each other, a primary winding is mounted on one of the longitudinal core portions on the outer longitudinal core portion, and one or two on the other longitudinal core portion. A winding transformer for high-voltage output is configured by attaching two or more secondary windings, and for frequency correction and leakage for increasing the resonance frequency of the winding transformer itself at a suitable position in the middle longitudinal core portion. A frequency correction / leakage air gap having two functions is provided.

  The present invention also provides a pair of E-type cores or E-type cores and I-type cores connected to each other and three longitudinal core portions parallel to each other at a predetermined interval, and perpendicular to the longitudinal core portions. And a primary winding is mounted in the middle of the middle longitudinal core portion of the longitudinal core portions, and the secondary windings are arranged on both sides of the middle primary winding, respectively. A winding type transformer for high voltage output with one input and multiple outputs is constructed by mounting a winding, and a gap for increasing the resonance frequency of the winding type transformer itself is provided at an appropriate position in the middle longitudinal core portion. Leakage gaps are provided at appropriate positions in the longitudinal core portion.

  Since the present invention is configured as described above, the resonance frequency of the high-voltage output winding transformer can be increased without reducing the number of turns of the secondary winding, so that the number of turns on the secondary side is increased. Even so, the resonance frequency on the primary side can be dealt with, and a high voltage can be efficiently extracted from the secondary side. In addition, since a large number of windings can be mounted on the secondary side, multiple outputs are possible, and a large number of loads can be driven efficiently.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
In FIG. 4, reference numeral 2 denotes a core used in the one-input two-output winding transformer 44 shown in FIG. 1, and a pair of E-type cores 2 a and 2 b are joined to constitute one core 2 as a whole. is doing. Three longitudinal core portions 4a, 4b, and 4c that are parallel to each other at predetermined intervals are inserted into bobbins 6, 8, and 10 shown in FIG. Terminal blocks 13 and 15 are arranged on both side core portions 4d and 4e perpendicular to the longitudinal core portions 4a, 4b and 4c, and the terminal blocks 13 and 15 and the bobbins 6, 8 and 10 are integrated. Is bound to.

  The bobbin 8 is wound with a primary winding 40 having a predetermined inductance, and the lead wire on the winding start end side is connected to the primary side input terminal 12 through a groove formed in the terminal block 15. is doing. The lead wire on the terminal end side of the primary winding 40 is connected to the primary side input terminal 14 through a groove formed in the terminal block 15. Secondary windings 39 and 48 for obtaining a high voltage are wound around the bobbins 6 and 10, and lead wires extended from one ends on the high voltage side of the secondary windings 39 and 48 are connected to the terminal block 13. The other end on the low voltage side of the secondary windings 39 and 48 is connected to the ground terminals 20 and 22 through the groove and connected to the secondary high voltage terminals 16 and 18. As shown in FIG. 4, the core 2 is formed with a gap 24 for increasing the resonance frequency of the winding transformer 44, and the resonance frequency of the winding transformer 44 itself corresponds to the primary input resonance frequency. It is adjusted to be the value of.

  Between the primary winding 40 and the secondary windings 39 and 48, barrier materials 26 and 28 made of an insulator for preventing creeping discharge are disposed. FIG. 5 shows a power supply device for the cold cathode fluorescent lamps 46 and 46 using the winding transformer 44 having one input and two outputs. A primary series resonance circuit is formed at the primary side input terminal 12 of the winding transformer 44 by the capacitor C1. In FIG. 5, reference numeral 51 denotes a phase detection circuit, which is connected to one end of the primary side of the winding transformer 44, that is, the midpoint P of the primary series resonance circuit via a lead wire 27 connected to a capacitor C3 for removing a direct current component. is doing. The phase detection circuit 51 extracts the primary resonance voltage from the middle point of the series resonance circuit on the primary side, matches the phase with the primary resonance current, and supplies this phase signal to the logic circuit 78.

  Reference numerals 52, 54, 56, and 58 denote switching elements made of FETs, and commutation diodes 60, 62, 64, and 66 are connected between the sources and drains of the respective switching elements. The capacitor C1 is connected between the drains of the switching elements 52 and 54, and the other end of the primary winding 40 is connected between the drains of the switching elements 56 and 58. Gate control circuits 68, 70, 72, 74 are connected to the gates of the switching elements 52, 54, 56, 58. Of these, the gate control circuits 68, 72 are connected to the PWM control circuit 76 for gate control. The circuits 70 and 74 are connected to the logic circuit 78. The PWM control circuit 76 receives a signal from the rectifying / smoothing circuit 80 that detects the current flowing through the lamps 46, 46 formed of cold cathode tubes, and the switching element 52 so that the level of this signal becomes a set value given from the line 82. , 56 are controlled.

  The lamps 46, 46 are connected in series, one lamp 46 is connected to the high voltage terminal 16 of the winding transformer 44, and the other lamp 46 is connected to the high voltage terminal 18 of the winding transformer 44. The ground terminals 20 and 22 of the winding transformer 44 are grounded via a resistor 48. The logic circuit 78 generates a signal for turning on and off the switching element based on the primary side series resonance phase signal of the transformer 44 from the phase detection circuit 51, and gate control circuits 68 and 72 via the PWM control circuit 76. An on / off control signal is sent to the gate control circuit 70 and an on / off control signal is sent to the gate control circuits 70 and 74.

  Further, the logic circuit 78 generates a dimming control signal based on the output signal of the dimming control circuit 84 to which the dimming signal is input, and burst control and PWM control of switching element on / off by the dimming control signal. The switch-on pulse width of the circuit 76 is controlled to keep the brightness of the lamps 46 and 46 constant, and based on the dimming signal, the brightness can be set to any value from zero to 100%. . Further, an overcurrent detection circuit 86 is connected to the logic circuit 78, and when an overcurrent flows through the lamps 46, 46, the logic circuit 78 detects this and sends a signal for preventing the overcurrent to the PWM control circuit 76. It is configured to prevent feed overcurrent.

  The start-up compensation circuit 88 is connected to the energization circuit of the lamps 46 and 46 so that the current signal of the lamps 46 and 46 is input from a line connected to the resistor 48. The start-up compensation circuit 88 inputs a start-up compensation signal to the phase detection circuit 51 so that the self-excited oscillation circuit starts up reliably when the power is turned on / off. The phase detection circuit 51 receives this start compensation signal and outputs a start signal for self-excited oscillation to the logic circuit 78. Even when the primary resonance signal whose phase has been corrected from the phase detection circuit 51 enters the logic circuit 78 and the current flows in the direction determined by the logic to the primary side of the transformer 44, the start-up compensation circuit 88 is connected to the lamps 46 and 46. Discharging may not start.

  The start-up compensation circuit 88 is provided for start-up compensation in such a case. In this case, in order to surely turn on the lamps 46, 46, the start-up compensation circuit 88 detects the current flowing through the lamps 46, 46 to determine whether the lamps 46, 46 are lit. Sends a startup compensation signal to the phase detection circuit 51 until it is lit. The phase detection circuit 51 receives the activation compensation signal and outputs an activation signal to the activation signal logic circuit 78 until the lamps 46 and 46 are turned on. Also, in the dimming operation, the entire logic signal is turned on and off with a burst signal whose ON width is PWM-controlled at a frequency lower than the primary resonance frequency of the transformer 44, and consequently the brightness is controlled. Yes.

  This method can be freely adjusted from extinction to full lighting, but since the lamps 46 and 46 are turned on and off at the cycle of this dimming signal, startup confirmation and reliable startup are required at each cycle. It becomes. Therefore, the start compensation circuit 88 first sends a start compensation signal to the phase detection circuit 51 in order to realize reliable lighting as described above. The start-up compensation operation will be described. When the power is turned on for the first time or when the lamp is not lit, for example, the switching elements 52 and 58 are turned on with a predetermined pulse width so that the current flows in the direction I1. . As a result, a current flows through the capacitor (C1) constituting the series resonance circuit and the primary winding 35 of the transformer 44, a signal enters the phase detection circuit 51 through the lead wire 27, and a current flows alternately as I2, I1, I2, and I1. The oscillation starts at the detected primary resonance frequency.

  The start-up compensation circuit 88 also makes an initial reset (at start-up) of the logic circuit 78. If the lamps 46 and 46 are not lit, the resetting is performed again, and the first start signal is sent to the logic circuit 78 through the phase detection circuit 51. The lamp open / short detection circuit 90 is connected to the secondary side of the wire wound transformer 44 and detects the voltage and current on the secondary side. When the lamps 46 and 46 are not lit or when the lamps 46 and 46 are not attached, that is, when the lamp is open or when the lamp wiring is short-circuited, that is, when the lamp is short-circuited, a signal is sent to the logic circuit 78 through the phase detection circuit 51. The feed and logic circuit 78, the PWM control circuit 76 and the gate control circuits 68, 70, 72, and 74 are configured to be cut off.

  The overcurrent detection circuit 86 sends a signal to the logic circuit 78 to shut off the control circuit when the PWM control circuit 76 is defective or the wiring of the lamps 46 and 46 is short-circuited. In FIG. 5, a logic circuit 78, a PWM control circuit 76, and gate control circuits 68, 70, 72, and 74 constitute a control circuit that drives a plurality of switching elements.

  In the above configuration, when the power switch is turned on and an ON signal is instantaneously supplied from any of the PWM control circuit 76 and the logic circuit 78 to any one of the gate control circuits 68, 74 or 72, 70, the DC power supply is switched to the switching element. A current flows through the primary side winding of the wound transformer 44 in the direction of I1 through 52 and 58 or in the direction of I2 through the switching elements 56 and. As a result, the self-excited oscillation circuit is activated, and the wound transformer 44 generates a resonance voltage. The frequency of the resonance voltage on the primary side of the wound transformer 44 is supplied to the phase detection circuit 51 through the lead wire 27.

  The logic circuit 78 and the PWM control circuit 76 drive the gate control circuits 68, 70, 72, 74 based on the phase signal from the phase detection circuit 51, and turn on / off the switching elements 52, 54, 56, 58. When the switching elements 52, 54, 56, 58 are turned on and off, current flows alternately in the directions of I 1 and I 2, and the self-excited oscillation circuit self-oscillates at the primary resonance frequency of the wound transformer 44. Note that the present invention is not particularly limited to a self-excited oscillation circuit using primary side series resonance, and a Royer type self-excited oscillation circuit using parallel resonance can be used on the primary side.

In the above embodiment, the primary winding 40 is attached to the central longitudinal core portion 4a of the E-type coupling core 2, and the secondary windings 39 and 48 are attached to the outer longitudinal core portions 4b and 4c, so that one input and two outputs are provided. Although the winding type transformer is realized, as shown in FIG. 2, the primary winding 40 and the secondary windings 39 and 48 may be mounted on the central longitudinal core portion 4a.
Next, a 1-input / 4-output winding transformer will be described.
In FIG. 6, 91 is a primary winding bobbin, 92 and 94 are secondary winding bobbins, and 96 and 98 are terminal blocks, each of which has a core stored therein. As shown in FIG. 4, the shape of the core is one in which E-type cores 2a and 2b are integrally coupled, and has the same configuration as the core of the wire-wound transformer of the first embodiment. A primary winding 100 is attached to a central longitudinal core portion 4 a of the core 2 in which a gap 24 is formed via a primary winding bobbin 91. The secondary windings 102 and 104 and the secondary windings 106 and 108 are mounted on the longitudinal core portions 4b and 4c of the core 2 via the secondary winding bobbins 92 and 94, respectively.

  Each of the secondary winding bobbins 92 and 94 is provided with a partition 110 made of a plurality of insulators, and the secondary windings 102, 104, 106, and 108 are partitioned into a plurality of winding regions by the partition 110. Yes. The high-voltage side of the secondary windings 102, 104, 106, 108 is set to the side located at the shortest distance from the terminal blocks 96, 98, and the secondary high-voltage terminals in which the lead wires on the high-voltage side are at the shortest distance, respectively. Connected to g, h, a, and n as shown. The lead wires on the low voltage side of the secondary windings 102, 104, 106, 108 are connected to the ground terminals e, j, c, l of the terminal blocks 96, 98 from the substantially central portions of the corresponding bobbins 92, 94. . The lead wires at both ends of the primary winding 100 are connected to primary input terminals d and k that are at the shortest distance, respectively. A resonance capacitor C1 is connected in series to the primary winding 100 of the one-input multiple-output winding transformer to form a primary series resonance circuit. Two cold-cathode tubes 46 and 46 are connected in series between the high-voltage terminals g and h of the four-output winding transformer, and the terminals e and j are grounded through a current detection resistor 48.

Similarly, two cold cathode tubes 46 and 46 are connected in series between the high voltage terminals a and n, and the terminals c and l are grounded through a current detection resistor 48. The lead wire 27 connected to the midpoint P of the series resonance circuit composed of the resonance capacitor C1 and the inductance of the primary winding 100 is connected to the phase detection circuit 51 shown in FIG. The primary side of the transformer is connected to a power supply device including a self-excited oscillation circuit shown in FIG. The lead wires 112 and 114 connected to the current detection resistors 48 and 48 are connected to a lamp open / lamp short detection circuit 90, a rectifying / smoothing circuit 80, and a start compensation circuit 88 of the self-excited oscillation circuit shown in FIG. is doing.
In the configuration described above, when the primary resonance input is supplied from the self-excited oscillation circuit shown in FIG. 5 to the series primary resonance circuit on the primary winding side of the winding transformer, a high voltage is applied to the secondary side of the winding transformer. And four cold cathode tubes 46 are driven. In the embodiment of the winding transformer shown in FIGS. 1 and 6, the primary winding is mounted on the longitudinal core portion 4a in the center of the E-type coupling core, and the secondary windings are mounted on the longitudinal core portions 4b and 4c on both sides. Therefore, the coupling between the primary and secondary windings is sparse.

  Therefore, leakage characteristics can be obtained in the wound transformer, and as a result, voltage fluctuations in the wound transformer are reduced, so that it is not necessary to attach a ballast capacitor to the cold cathode tube 46 as a load, and this can be omitted. . The cold cathode tube 46 may be provided with a ballast capacitor, and there is no problem even if a ballast capacitor is attached. Further, since the core 2 is provided with the air gap 24, even if a large number of windings are wound on the secondary side, the resonance frequency of the primary side input can be accommodated. A large number of loads such as cold cathode fluorescent lamps can be driven efficiently. Further, since the ballast capacitor can be omitted, there is no voltage division of the voltage applied to the load, and a high secondary voltage can be directly applied to the load, and the load can be driven efficiently.

Next, an EE coupling core provided with a gap having both functions of frequency correction and leakage will be described with reference to FIGS.
The upper and lower joint portions 122 and 124 of the E-type cores 102a and 102b are joined to the polished end surfaces of the cores 120a and 120b. A leakage gap 128 and a frequency correction gap 130 are formed in the central core portion 140 of the EE coupling core 126, and the core end faces 132, 134, and 136 forming the gaps 128 and 130 are polished. Has been. Various shapes of the core end surface forming the gap are conceivable. For example, as shown in FIG. 10, the core end surface 138 for forming the leakage gap may be inclined and polished. good. The leakage gap is used to control the current to a constant level when the magnetic circuit of the core of the wound transformer is saturated, the magnetic flux leaks from the core, and the impedance of the wound transformer changes.

As shown in FIG. 11, the middle longitudinal core portion 140 is provided with a leakage / frequency correction gap 142, and when the primary winding 144 is attached to the core portion 140 via a bobbin, The winding is divided into two parts, 144a and 1444b, separated by partitions 146 and 148, and the winding is eliminated from the gap 142 portion. This prevents the magnetic flux leaking from the gap 142 from crossing the electric wire. The mounting of the secondary winding is the same as in FIGS. In FIG. 12, a leakage / frequency correction gap 150 is provided in the central core portion 140 of the EE coupling core 126, and the primary winding 152 is attached to the outer core portion via a bobbin (not shown). A winding transformer is shown in which secondary windings 154 and 156 are mounted on the outer core portion via bobbins.

In FIG. 13, a leakage and frequency correction dual-use gap 166 is provided between the central core portion 164 and the I-type core 160 of the E-type core 158 and the EI coupling core 162 composed of the I-type core 160, and the outer side The winding type | mold transformer which attached | subjected the primary winding 52 to the core part of this through the bobbin, and attached secondary windings 154 and 156 to the other outer core part via the bobbin is shown. In any of the wound transformers shown in FIGS. 12 and 13, a gap for frequency correction may be formed in the joints 122, 124, 168, and 170.

FIG. 14 shows another embodiment of the wire-wound transformer, and a frequency correction gap 178 is provided in the central core portion 176 of the EE coupling core 174, and a leakage gap 180 is provided in the outer core portion. Yes. The primary winding 152 and the secondary windings 154 and 156 are attached to the central core portion 176 via a bobbin. FIG. 15 shows another embodiment of the wire-wound transformer, in which an E-type core 182 and an I-type core 184 are joined, a leakage gap 186 is provided in the outer longitudinal core portion, and a central longitudinal core portion is provided. A gap 188 for frequency correction is provided. A primary winding 152 and secondary windings 154 and 156 are attached to both sides of the central longitudinal core portion through bobbins. The winding transformers described in FIGS. 12, 13, 14, and 15 are all connected to the self-excited oscillation circuit shown in FIG. 5 and driven by the circuit.

FIG. 3 is an explanatory plan view of a wire wound transformer of the present invention. It is explanatory drawing which shows other embodiment of a winding type | mold transformer. It is explanatory drawing of a bobbin. It is explanatory drawing of a core. It is a block circuit diagram of a power supply device. It is explanatory drawing which shows other embodiment of a winding type | mold transformer. It is a partial circuit explanatory drawing which shows other embodiment of a power supply device. It is explanatory drawing which shows other embodiment of a core. It is explanatory drawing which shows other embodiment of a core. It is explanatory drawing which shows other embodiment of a core. It is explanatory drawing which shows other embodiment of a winding type | mold transformer. It is explanatory drawing which shows other embodiment of a winding type | mold transformer. It is explanatory drawing which shows other embodiment of a winding type | mold transformer. It is explanatory drawing which shows other embodiment of a winding type | mold transformer. It is explanatory drawing which shows other embodiment of a winding type | mold transformer.

Explanation of symbols

2 Core 2a E-type core 2b E-type core 4a Central part 4b Parallel part 4c Parallel part 6 Bobbin
8 Bobbins
10 Bobbin 12 Input end 13 Terminal block 14 Input end 15 Terminal block 16 Secondary high voltage terminal 18 Secondary high voltage terminal 20 Ground terminal 22 Ground terminal 24 Air gap 26 Barrier material 27 Lead wire 28 Barrier material 39 Secondary winding 40 Primary winding Wire 41 Secondary winding 44 Winding transformer 46 Cold cathode fluorescent lamp 48 Resistance 50 Malfunction prevention circuit 51 Phase detection circuit 52-58 Switching element 62-66 Commutation diode 68 Gate control circuit 70 Gate control circuit 72 Gate control circuit 74 Gate control circuit 76 PWM control circuit 78 Logic circuit 80 Rectification control circuit 82 Line 84 Dimming control circuit 86 Overcurrent detection circuit 88 Start-up compensation circuit 90 Lamp open / short detection circuit 91 Bobbin 92 Bobbin 94 Bobbin 96 Terminal block 98 Terminal block 100 Primary winding 102 Secondary winding 104 Secondary winding 10 6 Secondary winding 108 Secondary winding 110 Partition
120a E-type core 120b E-type core 122 joint 124 joint 126 joint core 128 gap 130 gap 132 core end face 134 core end face 136 core end face 138 core end face 140 core part 142 gap 144 primary winding 146 partition 148 partition 150 gap 152 Primary winding 154 Secondary winding 156 Secondary winding 158 E type core 160 I type core 162 Coupling core 164 Core portion 166 Gap 168 Junction 170 Junction 174 Coupling core 176 Core portion 178 Gap 180 Gap 182 E type core 184 Type I core 186 Gap 188 Gap

Claims (6)

A primary resonance circuit is configured by connecting a resonance capacitor to the primary side winding of the winding transformer, and the primary side of the winding transformer is connected to a control circuit for driving a plurality of switching elements. A primary resonance phase signal obtained by extracting a primary resonance voltage from the primary resonance current and supplying a primary resonance phase signal in phase with the primary resonance current to the control circuit to drive the winding transformer by causing the control circuit to self-oscillate. An apparatus according to claim 1, wherein a gap is provided in a core of the winding transformer corresponding to the primary resonance frequency to increase a resonance frequency of the winding transformer itself. A pair of E-type cores or E-type and I-type cores connected to each other and three longitudinal core portions parallel to each other at a predetermined interval, and both side core portions perpendicular to the appropriate position of the longitudinal core portion And a primary transformer and two or more secondary windings are installed at appropriate positions in the core portion to form a one-input multiple-output high-voltage output winding transformer, and the core portion A winding transformer characterized in that a gap for frequency correction for increasing the resonance frequency of the winding transformer itself is provided at an appropriate position. 3. The wound transformer according to claim 2, wherein a leakage gap is provided at an appropriate position of the core portion. A pair of E-type cores or E-type and I-type cores connected to each other and three longitudinal core portions parallel to each other at a predetermined interval, and both side core portions perpendicular to the appropriate position of the longitudinal core portion And a primary transformer and two or more secondary windings are installed at appropriate positions in the core portion to form a one-input multiple-output high-voltage output winding transformer, and the core portion A wound transformer having a gap having functions for both leakage and frequency correction for increasing the resonance frequency of the wound transformer itself. A pair of E-type cores or E-type and I-type cores connected to each other and three longitudinal core parts parallel to each other at a predetermined interval; and both side core parts perpendicular to the longitudinal core parts; Are formed integrally, and a primary winding and two or more secondary windings are mounted at appropriate positions of the core portion to form a one-input multiple-output high-voltage output winding transformer, and the core portion A frequency correction gap for increasing the resonance frequency of the winding transformer itself is provided at an appropriate position of the winding transformer, and a resonance capacitor is connected to the primary winding of the winding transformer to form a primary resonance circuit. The primary side of the linear transformer is connected to a control circuit that drives a plurality of switching elements, and the primary resonance phase signal obtained by extracting the primary resonance voltage from the primary resonance circuit and matching the phase with the primary resonance current is controlled. Supply to the circuit and let the control circuit self-oscillate Power supply being characterized in that so as to drive the wire-wound transformer. A pair of E-type cores or E-type and I-type cores connected to each other and three longitudinal core parts parallel to each other at a predetermined interval; and both side core parts perpendicular to the longitudinal core parts; Is formed integrally, and a primary winding and two or more secondary windings are mounted at appropriate positions of the core portion to form a single-input multiple-output high-voltage output winding transformer, A gap for frequency correction for increasing the resonance frequency of the winding transformer itself is provided at an appropriate place, and a primary capacitor is connected to the primary winding of the winding transformer to form a primary resonance circuit. A primary side of the transformer is connected to a control circuit for driving a plurality of switching elements, and a primary resonance phase signal obtained by extracting a primary resonance voltage from the primary resonance circuit and matching the phase with the primary resonance current is supplied to the control circuit. To supply the control circuit with self-excited oscillation A linear transformer is driven, and one electrode of the first fluorescent lamp is directly connected to the secondary high-voltage output terminal of the winding transformer without a ballast capacitor, and the first fluorescent lamp is connected in series with the first fluorescent lamp. A power supply apparatus comprising: a second fluorescent lamp connected; and the second fluorescent lamp connected directly to another secondary high-voltage output terminal of the winding transformer without a ballast capacitor.

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