JP2015133857A - High-voltage electric power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an electric power unit compact while enabling the electric power unit to output a plurality of high voltages.SOLUTION: An electric power unit includes one drive circuit 16 which supplies electric power to a primary winding 17, output parts 18, 19, and 20 comprising magnetic cores 21, 24, and 27, secondary windings 22, 25, and 28, and control windings 23, 26, and 29, and control parts 30, 31, and 32 which control the control windings 23, 26, and 29. The drive circuit 16 supplies a constant voltage to the primary winding 17, and the control parts 30, 31, and 32 switch the control windings 23, 26, and 29 between a short-circuit state and an open-circuit state to adjust voltages of the output parts 18, 19, and 20; and the primary winding 17 is arranged at one of three magnetic legs that the magnetic cores 21, 24, and 27 arranged in a θ shape have, the secondary windings 22, 25, and 28 and the control windings 23, 26, and 29 are arranged at one of the remaining magnetic legs, and a magnetic gap provided at the remaining magnetic leg determines the degree of coupling between the primary winding 17 and the secondary windings 22, 25, and 28.

Description

  The present invention relates to a high voltage power supply device used in various electronic devices.

  Hereinafter, a conventional high-voltage power supply device will be described with reference to the drawings. FIG. 7 is a block diagram showing a configuration of a printing apparatus using a conventional high-voltage power supply device. Here, first, a charger 2 for charging the outer periphery of the photosensitive drum 1 to a negative potential is disposed in contact with the outer periphery of the rotating photosensitive drum 1. The charger 2 charges the entire outer peripheral surface of the photosensitive drum 1 to a negative potential, and then the exposure device 3 exposes a portion unnecessary for printing on the outer peripheral surface of the photosensitive drum 1. Only the portion necessary for printing on the surface is left negatively charged, and the other portions are left uncharged.

  Next, the developing device 4 supplies toner (not shown) in a state charged in advance to a positive charge to the outer periphery of the photosensitive drum 1. As a result, on the outer periphery of the photosensitive drum 1, toner (not shown) is attached to a portion necessary for printing. Next, the paper 6 is charged to a negative potential by bringing the transfer roller 5 rotating in the opposite direction to the photosensitive drum 1 close to or in contact with the paper 6. The toner (not shown) attached to the outer periphery of the photosensitive drum 1 is transferred to the paper 6 by this negative potential. Thereafter, toner (not shown) is fixed onto the paper 6 by the fixing device 7, and printing on the paper 6 is completed. Further, the transfer roller 5 has a function of supplying a negative potential for transferring the toner (not shown) to the paper 6 and, for example, transferring toner (not shown) between the pieces of the paper 6. The function of preventing the paper 6 from being caught in the transfer roller 5 is provided by reversing and charging the positive potential once at a timing that does not require the toner.

  Finally, by removing the charged state of the photosensitive drum 1 with the static eliminator 8, the outer peripheral front surface of the photosensitive drum 1 is returned to the initial state, thereby completing the printing process.

  In the above example, there are generally three systems of high-voltage power supply units, one corresponding to charge the charger 2 to a negative potential and one corresponding to charge the transfer roller 5 to a positive potential and a negative potential. Was what was needed.

  For example, Patent Document 1 is known as prior art document information related to the invention of this application.

JP-A-1-304514

  However, as described above, since three types of high-voltage power supply units having different output potentials are required for the charger 2 and the transfer roller 5, the circuit block diagram of the conventional high-voltage power supply device of FIG. As shown, the control drive unit 9 to the charger 2 and the transfer roller 5 via the primary winding 11 and the secondary winding 12 of the individual transformer 10 and the drive circuit 13 for supplying electric power thereto, respectively. A voltage for charging was supplied.

  That is, in order to charge the charger 2 to a negative potential, the transformer 10, the drive circuit 13, the power line 14 that supplies power from the control drive unit 9 to the drive circuit 13, and the control line 15 that sends a control signal are controlled. This is necessary between the drive unit 9 and the charger 2. Similarly, in order to charge the transfer roller 5 to a negative potential or to charge the transfer roller 5 to a positive potential, the transformer 10 and the drive circuit 13 are separately required.

  Accordingly, since one drive circuit and one transformer are required for one high voltage output, there is a problem that it is difficult to reduce the size of the power supply device.

  Accordingly, an object of the present invention is to reduce the size of a power supply device while enabling a plurality of high voltages to be output.

And in order to achieve this purpose, one drive circuit unit for supplying power to one primary winding,
A plurality of output units configured by a magnetic core, a secondary winding, and a control winding and individually supplied with power from the primary winding to the secondary winding by magnetic coupling, and the control winding individually A control unit that controls, the drive circuit unit supplies power to the primary winding at a constant voltage, and the control unit switches the control winding between short-circuiting and opening-up so that the secondary winding Adjusting the voltage output from the output section to the output section, and the primary winding is wound around any one of the three magnetic legs of the magnetic core in the shape of a Japanese character, and the secondary winding The wire and the control winding are wound around one magnetic leg of the other magnetic legs of the magnetic core, and the primary winding and the secondary winding are formed by a magnetic gap provided in the remaining one magnetic leg. And the voltage output from the secondary winding is adjusted by determining the degree of coupling with A.

  According to the present invention, since it is possible to output a plurality of voltages while sharing the primary winding of the drive circuit and the transformer, the power supply device can be reduced in size.

1 is a circuit block diagram of a high voltage power supply device according to an embodiment of the present invention. The 1st lineblock diagram of the transformer of the high voltage power unit in one embodiment of the present invention. (A)-(k) The timing chart of the high voltage power supply device in one Embodiment of this invention The 2nd lineblock diagram of the transformer of the high voltage power unit in one embodiment of the present invention. (A) 1st perspective view of the transformer of the high voltage power supply device in one Embodiment of this invention, (b) Top view of the transformer of the high voltage power supply device in one embodiment of this invention (A) 2nd perspective view of the transformer of the high voltage power supply device in one embodiment of the present invention, (b) 3rd perspective view of the transformer of the high voltage power supply device in one embodiment of the present invention Block diagram of a printing device using a conventional high-voltage power supply Circuit block diagram of conventional high-voltage power supply

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a circuit block diagram showing a configuration of a high-voltage power supply device according to an embodiment of the present invention. A primary winding 17 is connected to the drive circuit 16, and the drive circuit 16 supplies power to the primary winding 17. As a plurality of secondary side output circuits magnetically coupled to the primary winding 17, a first output unit 18, a second output unit 19, and a third output unit 20 are provided. The first output unit 18 is provided with a first magnetic core 21, and a first secondary winding 22 and a first control winding 23 are wound around the first magnetic core 21. Similarly, the second output section 19 has a second magnetic core 24, a second secondary winding 25 and a second control winding 26, and the third output section 20 has a third magnetic core 27, Three secondary windings 28 and a third control winding 29 are provided, respectively, or arranged by winding.

  The first control unit 30 corresponds to the first output unit 18, the second control unit 31 corresponds to the second output unit 19, and the third control unit 32 corresponds to the third output unit 20. Is provided. Here, the first control unit 30 detects the output voltage of the first output unit 18 and issues a signal for switching the first control winding 23 to an open state or a short-circuit state based on the output voltage. Is controlled to a predetermined value. The relationship between the second control unit 31 and the second output unit 19 or the relationship between the third control unit 32 and the third output unit 20 is the same as that of the first control unit 30 and the first output unit. This is the same as the relationship with.

  As shown in the first block diagram of the transformer in FIG. 2, the primary winding 17 is wound around the magnetic leg 21 a of the first magnetic core 21 having a Japanese character shape. Further, the first secondary winding 22 and the first control winding 23 are wound around a magnetic leg 21b different from the magnetic leg 21a. Further, a magnetic gap 21g is formed in the magnetic leg 21c in which the primary winding 17, the first secondary winding 22 and the first control winding 23 are not wound. The degree of coupling between the primary winding 17 and the first secondary winding 22 is determined by the connection state of the magnetic gap 21 g and the first control winding 23. That is, the output voltage from the first secondary winding 22 depends on the size of the magnetic gap and the connection state of the first control winding 23. Here, the second magnetic core 24 and the third magnetic core 27 shown in FIG. The relationship between the second secondary winding 25 and the second control winding 26 with respect to the primary winding 17 and the magnetic gap (not shown), or the third secondary winding 28 and the second control winding 26. The relationship between the three control windings 29 and the primary winding 17 and the magnetic gap (not shown) is set individually in the same manner as described above with reference to FIG.

  Here, the primary winding 17 is used in common for the first magnetic core 21, the second magnetic core 24, and the third magnetic core 27.

  With the above configuration, the output voltages of the first output unit 18, the second output unit 19, and the third output unit 20 are different from each other by one primary winding 17 from one drive circuit 16, and It becomes possible to take out with arbitrary polarity. For this reason, the function of the multi-output power supply is achieved by the arrangement in which the drive circuit 16 and the primary winding 17 are suppressed to the minimum, and as a result, the power supply apparatus can be miniaturized.

  Further, the drive circuit 16 does not make any adjustments regarding the output voltages of the first output unit 18, the second output unit 19, and the third output unit 20. The adjustment of the output voltage is performed by the first control unit 30 and the second control based on the magnetic gap formed in the first magnetic core 21, the second magnetic core 24, and the third magnetic core 27 determined in advance, and the output voltage. According to instructions from the unit 31 and the third control unit 32, the first control winding 23, the second control winding 26, and the third control winding 29 are individually opened and closed. In other words, the adjustment of the output voltage is all performed by the response on the secondary side and the signal transfer limited to the secondary side. For this reason, since it becomes possible to isolate | separate between the drive circuit 16 and the primary winding 17 and each component of a secondary side by high insulation, the primary side and a secondary side have high insulation reliability. It can be secured.

  Here, the operation of the primary winding 17, the first secondary winding 22, and the first control winding 23 will be described in detail with reference to the first configuration diagram of the transformer shown in FIG.

  First, when a predetermined voltage is applied to the primary winding 17 from the primary terminal 17a, a voltage corresponding to the voltage applied to the primary terminal 17a is generated at the secondary terminal 22a of the first secondary winding 22. become. Here, when the load 33 is connected to the secondary terminal 22a, the magnetic flux φ1 is generated in the first magnetic core 21 corresponding to the voltage applied to the primary winding 17, and the first magnetic flux φ1 is canceled in order to cancel the magnetic flux φ1. The secondary winding 22 generates φ2 in the first magnetic core 21.

  Here, in order to output from the primary winding 17 to a plurality of other secondary sides not shown here, a substantially constant AC voltage is always applied to the primary winding 17. Yes. Therefore, the first control winding 23 is used as means for adjusting the voltage generated at the secondary terminal 22a. The first control winding 23 is arranged adjacent to the first secondary winding 22 and wound around the same magnetic leg 21b, and is short-circuited or opened when the load 33 is connected. It is repeatedly controlled so that Specifically, the voltage generated at the secondary terminal 22a is fed back to control the opening / closing of the open / close switch 34, whereby the first control winding 23 is formed into a short ring shape or an open ring shape. Since the voltage generated at the secondary terminal 22a is suppressed when the first control winding 23 is in the short ring shape, the time for making the first control winding 23 in the short ring shape is controlled. As a result, the voltage generated at the secondary terminal 22a is controlled. Here, as the load 33, although not shown, a charger or a transfer roller connected to a high voltage power supply device is generally applied. In this embodiment, as described above, a case where the open / close switch 34 is controlled by feeding back the voltage generated at the secondary terminal 22a is shown as an example. However, the control method of the open / close switch 34 is not limited to this. For example, when the allowable range of the voltage value supplied to the secondary terminal 22a is large, the open / close switch 34 may be controlled to open / close by a predetermined signal. Alternatively, the open / close switch 34 may be controlled to reflect the state of a related portion in a printing apparatus in which a high-voltage power supply device (not shown) is arranged. As a result, the high-voltage power supply device can directly control the printing state of the printing device, not indirectly.

  Here, the magnetic leg 21c provided with the magnetic gap 21g is provided in parallel with the magnetic leg 21a around which the primary winding 17 is wound and the magnetic leg 21b around which the first secondary winding 22 is wound. As a result, the following effects are obtained at each timing when the first control winding 23 is formed in an open ring shape or a short ring shape.

  First, when the open / close switch is open and the first control winding 23 is in an open ring shape, a part of the magnetic flux φ1 generated by the primary winding 17 flows to the magnetic leg 21c. For this reason, the magnetic flux φ2 generated by the first secondary winding 22 is also reduced as compared with the case where the magnetic leg 21c is not present. That is, at this time, when a voltage is applied to the primary winding 17, the voltage excited in the first secondary winding 22 is reduced by providing the magnetic leg 21 c, and the primary winding 17 and the first winding 17 Compared with the case where the magnetic leg 21c does not exist, the coupling of the secondary winding 22 of 1 is sparse.

  Therefore, when the first control winding 23 is in an open ring shape, the magnetic legs 21c are provided so that the primary and secondary are loosely coupled, and the first magnetic core 21 as a whole is less likely to cause magnetic saturation. Become. As a result, the set value of the primary voltage, which is a fixed value, can be selected from a wide range of non-saturation regions.

  On the other hand, when the open / close switch is connected and the first control winding 23 is in a short ring shape, most of the magnetic flux φ1 generated by the primary winding 17 flows to the magnetic leg 21c as leakage flux. Then, since the first control winding 23 having a short ring shape generates a magnetic flux φc repelling the magnetic flux φ1, the magnetic flux φ2 generated by the first secondary winding is the first control winding 23. It will be significantly reduced compared to when it is in an open ring shape. Therefore, the voltage generated at the secondary terminal 22a is also greatly reduced as compared to when the first control winding 23 is in an open ring shape. That is, at this time, the primary winding 17 and the first secondary winding 22 are in a very sparse state where they are hardly coupled.

  In order to utilize the above characteristics, as an actual circuit operation, opening / closing of the open / close switch 34 is controlled by a PWM signal of a switching element (not shown). As a result, opening / closing of the open / close switch 34 is performed as an operation of switching at high speed, and the voltage value generated at the secondary terminal 22a can be finely changed or finely adjusted as a continuous value.

  For example, the open / close switch 34 is controlled by the PWM signal, and when the PWM signal is HIGH, the open / close switch 34 is closed and the first control winding 23 is in a short ring shape. At this time, the voltage excited in the first secondary winding 22 is significantly lower than the voltage when the PWM signal is LOW and the first control winding 23 is in an open ring shape. At the same time, the degree of decrease in voltage excited in the first secondary winding 22 can be controlled by controlling the duty ratio of the PWM signal (the time during which the HIGH state continues).

  In the above description, since the control for the open / close switch 34 is performed using the PWM signal, it is common to use an FET for the open / close switch 34 and to turn it ON / OFF using the PWM signal. However, the control method of the open / close switch 34 is not limited to using a PWM signal. For example, by using a transistor for the open / close switch 34, an impedance is connected to the transistor, and the first control winding 23 is opened or shorted. It is good to change continuously to a low closed loop. That is, the control for the open / close switch 34 may be performed by an analog signal. As a result, the voltage excited in the first secondary winding 22 is less likely to include a sudden voltage, and as a result, the output voltage can be stably obtained.

  And by providing the magnetic leg 21c for allowing the leakage magnetic flux to pass, it is possible to secure a magnetic path through which the magnetic flux generated in the primary winding 17 passes even when the first control winding 23 is short-circuited. It becomes a state. Therefore, even when the first control winding 23 has a short ring shape, the power supply from the drive circuit 16 shown in FIG. 1 to the primary winding 17 can be continued without failure.

  Here, if the first control winding 23 has a short ring shape without the magnetic legs 21c shown in FIG. 2, all of the magnetic flux φ1 generated by the primary winding 17 is changed to the magnetic flux by the first control winding 23. φc will cancel out. Therefore, since the drive circuit 16 and the primary winding 17 shown in FIG. 1 operate in an overload state, the drive circuit 16 and the primary winding 17 cause troubles such as overcurrent and accompanying heat generation. A possibility arises. For this reason, the stable operation | movement of the whole circuit is attained by providing the magnetic leg 21c for allowing a leakage magnetic flux to pass through.

  Here, the magnetic leg 21a wound with the primary winding 17 and the magnetic leg 21b wound with the first secondary winding 22 are described using an example in which no magnetic gap is provided. In consideration of characteristics, a magnetic gap may be provided for each or one of them. Basically, the maximum value of the output voltage is defined by defining the degree of coupling between the primary side and the secondary side by the magnetic gap. Then, by operating the first control winding 23, the degree of decrease from the maximum value of the output voltage is defined.

  As described above, in this high-voltage power supply device, the magnetic leg 21c for allowing the leakage magnetic flux to pass is provided in the first magnetic core 21, and the first control winding 23 is repeated in a short ring shape and an open ring shape. By switching, the output voltage to the secondary terminal 22a is controlled. As described above, the output voltage can be quickly set to an appropriate voltage value by a voltage value having continuity, and a constant voltage power source is used on the primary side. In addition, the secondary-side output voltage can be controlled and set only on the secondary side, and the primary-side power supply can be maintained in a stable operating state.

  In addition, the primary side and the secondary side are arranged in an insulated state by a transformer, and further, the primary side and the secondary side are not connected by a feedback circuit or the like, and the feedback circuit is a connection completed only on the secondary side. It has become. For this reason, even if an accident such as a short circuit occurs on the secondary side, which is on the high voltage side, the influence on the primary side is limited, and propagation to a major accident can be suppressed.

  Here, the relationship between the primary winding 17, the first magnetic core, the first secondary winding 22, and the first control winding 23 is shown as a representative of the first output unit 18, but the second output The relationship between the primary side and the secondary side and the function of the secondary side are the same for the unit 19 and the third output unit 20 as well. In this embodiment, the first output unit 18 is used for positive potential output, the second output unit 19 is used for negative potential output, and the third output unit 20 is used for positive potential output. However, in all output units, whether the output is a positive potential output or a negative potential output can be dealt with according to a request, and is not limited to this embodiment. In addition, here, the output unit is described as an example of a power supply device that obtains three systems of output, that is, the first output unit 18, the second output unit 19, and the third output unit 20. Or it may be a plurality of four or more systems.

  For example, the operation when the first output unit 18, the second output unit 19, and the third output unit 20 are all positive potential outputs and the respective output voltages are different values will be described. In FIG. 1, the second output unit 19 is illustrated as a connection for outputting a negative potential. However, in the following description, for the sake of convenience, description will be made assuming a connection for outputting a positive potential. FIG. 3 is a timing chart of the high-voltage power supply device according to the embodiment of the present invention. 3A shows a curve of a signal for controlling the voltage of the primary winding, FIG. 3B shows a voltage curve of the primary winding, and FIG. 3C shows a control winding of the first output unit. 3 (d) shows the voltage curve of the secondary winding of the first output section, FIG. 3 (e) shows the output voltage curve of the first output section, and FIG. f) is a curve of a signal for controlling the control winding of the second output section, FIG. 3G is a voltage curve of the secondary winding of the second output section, and FIG. The output voltage curve of the output unit, FIG. 3 (i) shows the curve of the signal for controlling the control winding of the third output unit, and FIG. 3 (j) shows the voltage curve of the secondary winding of the third output unit. 3 (k) shows an output voltage curve of the third output unit, respectively.

  Here, as shown in FIG. 3A, in order to supply the primary side voltage, a control signal having a fixed frequency is generated from the drive circuit 16, and the primary side switch 16a is opened and closed in response to the control signal. Is done. By opening and closing the primary side switch 16a, a primary voltage is supplied to the primary winding 17 as shown in FIG. The primary voltage shown here uses a resonant voltage generated in the primary winding 17 and the resonant capacitor 17b connected in parallel by the primary side switch 16a being opened and closed at a predetermined frequency. The secondary voltage is excited in each of the first secondary winding 22, the second secondary winding 25, and the third secondary winding 28 by the primary voltage supplied to the primary winding 17. Here, the first secondary winding 22, the second secondary winding 25, and the third secondary winding 28 all have the same characteristics including the number of turns and the degree of coupling with the primary winding 17. Each secondary voltage is controlled according to the time during which the first control winding 23, the second control winding 26, and the third control winding 29 are short-circuited. Is done.

  First, as shown in FIG. 3C, when the control signal for controlling the output voltage of the first output unit 18 always instructs opening and the open / close switch 34 is always opened, the first signal shown in FIG. The voltage curve of the first secondary winding 22 shows that the smoothed DC output voltage V1 shown in FIG. 3E is obtained when the period during which the voltage is excited in the first secondary winding 22 becomes the longest. Is the maximum value. Next, as shown in FIG. 3 (f), the control signal for controlling the output voltage of the second output unit 19 instructs short-circuiting during a limited period t1, and instructs opening during other periods. When the opening / closing switch 35 is repeatedly opened and closed, the voltage curve of the second secondary winding 25 shown in FIG. 3 (g) shows that the period during which the voltage is excited by the second secondary winding 25 is limited. The smoothed DC output voltage V2 shown in FIG. 3 (h) is lower than V1. Further, as shown in FIG. 3 (i), the control signal for controlling the output voltage of the third output unit 20 indicates a short in a period t2 longer than t1, and indicates an open in other periods. When the opening / closing switch 36 is repeatedly opened and closed, the voltage curve of the third secondary winding 28 shown in FIG. 3 (j) further limits the period during which the voltage is excited by the third secondary winding 28. As a result, the smoothed DC output voltage V3 shown in FIG. 3 (k) becomes lower than V2. Although not shown here, if any of the first output unit 18, the second output unit 19, or the third output unit 20 is instructed to short-circuit over the entire period, No voltage is excited on the secondary side and no DC voltage is output.

  Here, all the control signals for the secondary side shown in FIG. 3C, FIG. 3F, and FIG. 3J are synchronized with the control signal for the primary side shown in FIG. . As a result, the secondary voltages excited in each of the first secondary winding 22, the second secondary winding 25, and the third secondary winding 28 are also substantially synchronized. Accordingly, the potential difference generated between the first secondary winding 22, the second secondary winding, and the third secondary winding 28 can be accurately captured. As a result, appropriate characteristics can be set for the insulation between the first secondary winding 22, the second secondary winding, and the third secondary winding 28, and the reliability can be improved. Can do.

  Further, in order to keep the voltage supplied to the primary winding 17 constant, as shown in FIG. 3A, the drive circuit 16 is driven and the control signal is a constant signal with a fixed frequency. For this reason, the frequency of the noise radiated from the drive circuit 16 and the primary winding 17 is also a fixed frequency. Therefore, it is possible to facilitate measures and measures for shielding and suppressing this noise. This also applies to the secondary side, and by giving instructions to the open / close switches 34, 35, and 36 at the same frequency as the primary side, means and measures for noise shielding and suppression can be facilitated.

  In the present embodiment, particularly in the example of FIG. 2, the magnetic leg 21 c for allowing the leakage magnetic flux to pass is a magnetic leg 21 a around which the primary winding 17 is wound and a magnetic leg 21 b around which the first secondary winding 22 is wound. Between the magnetic leg 21a and the first secondary winding 22 wound with the primary winding 17, as shown in the second configuration diagram of the transformer of FIG. You may arrange | position the magnetic leg 21b and the magnetic leg 21c for allowing a leakage magnetic flux to pass in order in parallel.

  In addition, as shown in FIG. 1, the primary winding 17 is used in common for the first magnetic core 21, the second magnetic core 24, and the third magnetic core 27. An example of a specific structure will be described with reference to the perspective view of the transformer in FIG. 5A and the top view of the transformer in FIG.

  Here, the first magnetic core 21, the second magnetic core 24, and the third magnetic core 27 are arranged in parallel as a spatial positional relationship, and a magnetic core for winding the primary winding 17 is wound around each magnetic core. Legs 21a, 24a, and 27a are provided. These magnetic legs 21a, 24a, 27a are arranged in a state of being bundled by a single primary winding 17.

  The first secondary winding 22 is on the magnetic leg 21 b of the first magnetic core 21, and the second secondary winding 25 is on the magnetic leg 24 b of the second magnetic core 24, and the third secondary winding. 28 are wound around the magnetic legs 27b of the third magnetic core 27, respectively. A first control winding (not shown here) is adjacent to each of the first secondary winding 22, the second secondary winding 25, and the third secondary winding 28, A second control winding 26 and a third control winding 29 are wound. As described above, these control windings control the output voltage of each secondary winding.

  Further, magnetic legs 21c, 24c, and 27c are provided in the first magnetic core 21, the second magnetic core 24, and the third magnetic core 27, respectively, for making them correspond to the leakage magnetic flux. Further, here, with the primary winding 17 as a boundary, the first secondary winding 22 and the third secondary winding 28 are disposed on one side of the primary winding 17, and the second secondary winding 25 is disposed on the primary side. Arranged on the other side of the winding 17. Further, the magnetic legs 21c, 24c, and 27c for corresponding to the leakage magnetic flux are arranged between the primary winding 17 and the second secondary winding 25 after being arranged in a line on substantially the same line.

  By configuring the transformer as described above, the single primary winding 17 bundles the magnetic legs 21a, 24a, 27a, the first secondary winding 22, the second secondary winding 25, the third secondary winding. The configuration is commonly applied to the next winding 28. For this reason, the magnetic flux excited by the primary winding 17 passes through the magnetic legs 21a, 24a, 27a substantially evenly. Accordingly, it is possible to stabilize the voltage output from each of the first secondary winding 22, the second secondary winding 25, and the third secondary winding 28 and the power that can be supplied. High reliability can be maintained as a power source.

  In addition, since the first magnetic core 21, the second magnetic core 24, and the third magnetic core 27 are arranged in parallel as positions, and the magnetic legs 21 a, 24 a, 27 a are bundled by the primary winding 17, The external appearance of the primary winding 17 from the winding axis direction tends to be rectangular. The first secondary winding 22 and the third secondary winding 28 are arranged on one side with the rectangular primary winding 17 as a boundary, and the second secondary winding is arranged on the other side. 25 is arranged. Therefore, the spatial distance is increased regardless of the polarity of each winding, and the insulation of each secondary winding that outputs a high voltage can be improved. Furthermore, the first secondary winding 22 and the third secondary winding 28 are arranged on the one side as the same polarity output with the rectangular primary winding 17 as the boundary, and the other as the reverse polarity output. A second secondary winding 25 is arranged on the side. Therefore, it is possible to improve the insulation of each secondary winding that outputs a high voltage.

  For example, when the first secondary winding 22 and the third secondary winding 28 are high-voltage positive potential side outputs, and the second secondary winding 25 is high-voltage negative potential side output, the potential difference The second secondary winding 25 and the first secondary winding 22 or the third secondary winding 28 have a large positional relationship through the primary winding 17 with a large distance therebetween. . At the same time, the second magnetic core 24 is disposed between the first magnetic core 21 and the third magnetic core 27, and the second secondary winding 25 includes the first secondary winding 22 and Since the arrangement direction is different with respect to the third secondary winding 28 and the primary winding 17, there is also a space between the first secondary winding 22 and the third secondary winding 28. It will be. Thereby, it becomes possible to improve the insulation between the secondary windings between the same polarity and between the opposite polarities.

  Here, the magnetic legs 21c, 24c, and 27c for corresponding to the leakage magnetic flux are further positioned between the primary winding 17 and the second secondary winding 25. As a result, the spatial distance between the individual secondary windings can be further increased, and the insulation can be improved.

  In these descriptions, the first secondary winding 22 and the third secondary winding 28 are for high-voltage positive potential side output, and the second secondary winding 25 is for high-voltage negative potential side output. There is no problem even if the first secondary winding 22 and the third secondary winding 28 are used for high-voltage negative potential side output, and the second secondary winding 25 is used for high-voltage positive potential side output.

  Regarding the structure of the above transformer, only the relationship between the magnetic core and the winding is described. However, in actually configuring the transformer, a bobbin (not shown) is used to hold and fix the magnetic core and the winding to each other. ), But the explanation is omitted here.

  Further, the transformer shown in this embodiment is configured by arranging the first magnetic core 21, the second magnetic core 24, and the third magnetic core 27, which are individual magnetic cores, in parallel as a spatial positional relationship. In this example, the configuration in which the magnetic legs 21a, 24a, and 27a are bundled by the primary winding 17 among the respective magnetic cores is shown as an example. However, the individual magnetic cores may be integrated without being arranged in parallel. In the top view of the transformer in FIG. 5B, the magnetic legs 21a, 24a, and 27a for winding the primary winding 17 are individually provided as described above. On the other hand, as shown in the perspective views of the transformers in FIGS. 6A and 6B, the integral magnetic core 37 includes a common magnetic leg 38 for winding the primary winding 17.

  When, for example, three systems of secondary power are extracted from the power of the primary winding 17 wound around the common magnetic leg 38, the power is radially centered around the common magnetic leg 38 as shown in FIG. The integrated magnetic core 37 may be formed by disposing the secondary magnetic leg 39 on the outermost side in the three directions. As a matter of course, the first secondary winding 22 and the first control winding 23 are adjacent to each secondary magnetic leg 39, and the second secondary winding 25 and the second control winding 26. Are adjacent to each other, and the third secondary winding 28 and the third control winding 29 are adjacently wound. A leakage magnetic leg 40 is provided between the common magnetic leg 38 and each secondary magnetic leg 39, and a magnetic gap 40 g is formed in the leakage magnetic leg 40. In particular, when the secondary magnetic legs 39 are arranged radially outward from the common magnetic legs 38 to form the integrated magnetic core 37, the magnetic fluxes passing through the secondary magnetic legs 39 interfere with each other. Since it becomes difficult to receive, the characteristic as a transformer can be stabilized. Further, the distance separating each of the first secondary winding 22, the second secondary winding 25, and the third secondary winding 28 can be maximized, thereby improving the insulation reliability. be able to.

  Alternatively, when taking out the power of the secondary side of the three systems, the second secondary winding 25 and the second control winding 26 are arranged on one side with the common magnetic leg 38 as a boundary as shown in FIG. A secondary side magnetic leg 39 for winding adjacent to each other, and a secondary side for winding adjacent to the first secondary winding 22 and the first control winding 23 on the other side A secondary side magnetic leg 39 for winding the magnetic leg 39 adjacent to the third secondary winding 28 and the third control winding 29 may be disposed. In this case, a voltage having the same polarity is generated in the first secondary winding 22 and the third secondary winding 28, and the first secondary winding 25 is provided in the first secondary winding 25. The winding 22 and the third secondary winding 28 may be set so as to generate voltages having opposite polarities. In the case of the same polarity, even if the first secondary winding 22 and the third secondary winding 28 approach each other, a large potential difference is unlikely to occur, and a reverse polarity winding in which a large potential difference is likely to occur. Therefore, the insulation reliability can be maintained even in a dense winding arrangement.

  Further, by using the common magnetic leg 38, the conductor length of the primary winding 17 wound around the common magnetic leg 38 can be shortened and the direct current resistance can be suppressed, so that the power loss in the primary winding 17 can be reduced. Therefore, the power efficiency of the entire high-voltage power supply device can be improved.

  The high-voltage power supply device of the present invention has an effect that the power supply device can be reduced in size, and is useful in various electronic devices.

DESCRIPTION OF SYMBOLS 16 Drive circuit 16a Primary side switch 17 Primary winding 17a Primary terminal 17b Resonance capacitor 18 1st output part 19 2nd output part 20 3rd output part 21 1st magnetic core 21a, 21b, 21c Magnetic leg 21g, 40g Magnetic gap 22 First secondary winding 22a Secondary terminal 23 First control winding 24 Second magnetic core 24a, 24b, 24c Magnetic leg 25 Second secondary winding 26 Second control winding 27 Second 3 magnetic cores 27a, 27b, 27c magnetic leg 28 third secondary winding 29 third control winding 30 first control unit 31 second control unit 32 third control unit 33 load 34, 35, 36 Open / close switch 37 Integrated magnetic core 38 Common magnetic leg 39 Secondary magnetic leg 40 Leak magnetic leg

Claims (4)

One drive circuit for supplying power to one primary winding;
A plurality of output units configured by a magnetic core, a secondary winding, and a control winding and individually supplied with electric power by magnetic coupling from the primary winding to the secondary winding;
A control unit for individually controlling the control winding,
The drive circuit unit supplies power at a constant voltage to the primary winding,
The control unit adjusts the voltage output from the secondary winding to the output unit by switching the control winding between short circuit and open, and
The primary winding is wound around any one of the three magnetic legs of the magnetic core in the shape of a sun,
The secondary winding and the control winding are wound around one of the other magnetic legs of the magnetic core;
A high-voltage power supply apparatus that adjusts a voltage output from the secondary winding by determining a degree of coupling between the primary winding and the secondary winding by a magnetic gap provided in the remaining one magnetic leg. 2. The high-voltage power supply device according to claim 1, wherein the primary winding is formed by bundling and arranging any one of the magnetic legs in the magnetic core of each of the plurality of output units. A drive control signal for controlling a voltage supplied to the primary winding by the drive circuit;
The output control signal for the control unit to short-circuit or open the control winding,
The high-voltage power supply device according to claim 1, which has the same frequency and is synchronized. The high-voltage power supply device according to claim 1, wherein the primary winding, the secondary winding, and the magnetic core constitute a transformer.

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