JP4075158B2 - High frequency inverter and discharge lamp lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency inverter using FETs as switching means and a discharge lamp lighting device using the same.
[0002]
[Prior art]
A conventional start circuit for a high-frequency inverter includes, for example, a resistor R3 and a capacitor C1 connected in series to a DC power source, a contact point of the resistor R3 and the capacitor C1, and a control pole of a switching element as disclosed in Japanese Patent Laid-Open No. 3-59998. This is a configuration using a trigger diode connected between (base, gate).
[0003]
In this starting circuit, at the time of starting, the trigger diode applies a voltage to the control electrode of the switching element Q2 on the reference potential side (low side), and the switching element Q2 is turned on. When the switching element Q2 is turned on, a current flows through the load circuit on the secondary side and a resonance voltage having a reverse polarity is generated. On the other hand, the winding n1 magnetically coupled to the load circuit applies a reverse polarity voltage to the control pole of the switching element Q2 to turn off the switching element Q2, and the magnetically coupled winding n2 is also connected to the high potential side. A voltage is applied to the control pole of the (high side) switching element Q1 to turn on the switching element Q1. When the switching elements Q1 and Q2 are turned on / off, the inverter oscillates.
[0004]
[Problems to be solved by the invention]
  In conventional high-frequency inverters,It was difficult to simplify the starting circuit and to reduce the cost. Also,If the switching element Q1 on the high potential side deteriorates and does not oscillate due to any trouble, for example, the generation of an undesired current or voltage due to tracking in the circuit, the switching element on the reference potential side will not oscillate. If Q2 remains normal, the starting circuit intermittently supplies voltage to the control pole to turn on the switching element Q2, and the inverter continues the abnormal oscillation operation.
[0005]
This abnormal oscillation is due to the aging of the high-frequency inverter, but if the insulation performance of the surface of circuit boards, parts, etc. has deteriorated due to the aging, if the abnormal oscillation continues for a long time, normal oscillation will occur due to intermittent oscillation. It is conceivable that current due to tracking flows at a location different from the current loop, and heat generation and burning occur.
[0006]
  The present invention has been made in view of the above problems,An object of the present invention is to provide a high-frequency inverter and a discharge lamp lighting device capable of reducing the cost by simplifying the starting circuit. Also,It is an object of the present invention to provide a high-frequency inverter and a discharge lamp lighting device that stops oscillation without causing abnormal oscillation even when the FET is deteriorated and does not reach tracking.
[0007]
[Means for achieving the object]
  The high-frequency inverter according to claim 1 includes a DC power source; an N-channel FET and a P-channel FET connected in series between the DC power sources, and each gate and source connected in common; A load circuit that operates at a high frequency generated by alternating switching of a P-channel FET; feedback means for feeding back the load current of the load circuit, a series resonance circuit that resonates with the feedback voltage, and positive and negative based on the resonance voltage of the series resonance circuit A capacitor that outputs a gate voltage is provided, and the gate voltage output by the capacitor acts in common on the N-channel FET and the P-channel FET to alternately switch the N-channel FET and the P-channel FET. A gate circuit; one end is the positive pole of the DC power supply and the other end is the gate Each circuit has a positive resistance connected to the circuit and one end connected to the gate circuit and a negative resistance connected to the negative electrode of the DC power supply at the other end. The positive and negative resistances are connected in series via the gate circuit. When a DC voltage is applied from a DC power source, a gate voltage is generated in the capacitor of the gate circuit via the positive and negative resistors.Turn on the N-channel FET firstAnd a starting circuit.
[0008]
In the present invention and each of the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.
[0009]
“High frequency inverter” refers to circuit means for converting direct current to high frequency.
[0010]
“High frequency” refers to a frequency of 1000 Hz or more.
[0011]
The direct current power source may be either a rectified direct current power source that rectifies alternating current or a battery power source.
[0012]
Connecting an N-channel FET and a P-channel FET in series between DC power supplies means that both FETs are connected in series as viewed from the DC power supply, and other circuits are connected between the FETs and the DC power supply. Components such as resistors may be interposed. Further, a circuit component may be interposed between both FETs.
[0013]
The gate circuit is arranged to supply each required gate voltage in common to the N-channel FET and the P-channel FET. That is, a positive voltage is applied to the N channel FET to turn it on, and a negative voltage is applied to the P channel FET to turn it on. N-channel FETs and P-channel FETs are turned on alternately.
[0014]
  The starting circuit generates a gate voltage to the gate circuit through the positive and negative resistors when a DC voltage is applied from the DC power source at the start.N-channel FET firstIt is configured to turn on.
[0015]
The load circuit operates at a high frequency generated by alternating switching of an N-channel FET and a P-channel FET. The load allows any desired one including a discharge lamp.
[0016]
When the load is a discharge lamp, for example, a current-limiting inductance is connected in series with the load as ballast means in order to compensate for the negative characteristics of the load.
[0017]
Further, when the discharge lamp is a low-pressure discharge lamp such as a fluorescent lamp, it is common to use a filament electrode as an electrode and to start the hot cathode and turn on the hot cathode. In such a case, there are the following two methods for heating the filament electrode at the time of starting.
[0018]
The first is to connect a resonance capacitor in parallel with the discharge lamp via at least one filament electrode at the time of starting. If it does so, since an electric current will flow into a filament via a current-limiting inductance and a resonance capacitor at the time of starting, the filament connected in series with these will be heated. At the same time, the current-limiting inductance and the resonance capacitor moderately resonate in series, and the terminal voltage of the resonance capacitor increases, so that the starting of the discharge lamp is facilitated.
[0019]
The second is to heat the filament electrode using a filament heating transformer. The filament heating transformer may be provided separately from the current limiting inductance, but if necessary, the filament heating winding can be magnetically coupled to the current limiting inductance. Then, the increase in the number of circuit components can be suppressed.
[0020]
Further, the load circuit can supply energy for self-oscillation and a specified operating frequency to the gate circuit of the N-channel FET and the P-channel FET, if necessary.
[0021]
The high frequency inverter of the present invention is preferably provided with a feedback means, a series resonance circuit, and a gate voltage output means as required.
[0022]
The feedback means feeds back the load current and supplies the gate circuit with energy for self-excited oscillation and a specified operating frequency. For example, the feedback means can be configured using a current transformer, a resistor, a photocoupler, or the like. .
[0023]
When the voltage obtained from the feedback means is supplied to the series resonance circuit, series resonance is generated, and an oscillating voltage of positive and negative polarity boosted from the feedback voltage is generated between the terminals of the capacitor or the inductance constituting the series resonance circuit. Let
[0024]
The gate voltage output means takes out the positive and negative boosted voltage generated in the series resonance circuit as a gate voltage through an appropriate impedance, and applies it between the gate and source of each FET.
[0025]
Thus, a positive gate voltage is applied between the gate and source of the N-channel FET to turn on the FET.
[0026]
A negative gate voltage is applied between the gate and source of the P-channel FET to turn on the FET. Since the feedback voltage is boosted by series resonance in the series resonance circuit, the feedback voltage may be low. This means that the size of the feedback means can be reduced and the size can be reduced.
[0027]
In the high-frequency inverter according to the present invention, the gate circuit includes gate protection means including a plurality of constant voltage elements in which the gate voltage output means is connected in series with opposite polarities, and the voltage across the constant voltage element is N-channel FET and P It may be configured to be applied between the gate and the source of the channel FET.
[0028]
As the constant voltage element, a Zener diode or the like can be used.
[0029]
The number of constant voltage elements may be determined by the relationship between the constant voltage and the gate voltage.
[0030]
A plurality of constant voltage elements connected in series with opposite polarities constitute gate protection means for both N-channel FETs and P-channel FETs which are complementary. Thus, since the voltage that becomes an overvoltage with respect to the gate is short-circuited and absorbed by the gate protection means, only an appropriate voltage is applied to each gate. If an overvoltage is applied between the gate and source of the FET, it will cause destruction of the FET, so it is common to add gate protection means.
[0031]
However, since only one set of gate protection means needs to be used, circuit components can be reduced and the high-frequency inverter can be miniaturized.
[0032]
  According to the high frequency inverter of claim 1, the complementary FET is used,Generate a gate voltage in the capacitor of the gate circuitSince it has a starting circuit,An inexpensive and simple starting circuitSimplification of circuit configuration and cost reduction.
[0033]
  2. The high frequency inverter according to claim 1, wherein the starting circuit generates a voltage between a gate and a source common contact of the gate circuit.Let meN channel FET is turned on firstResistanceIt is characterized by comprising an anti-resistor and a capacitor.
[0034]
  According to the high frequency inverter of the second aspect, even if the FET is deteriorated, the oscillation is stopped before the abnormal oscillation. Therefore, even if the insulation performance is deteriorated by dust, a high voltage due to the resonance operation is not generated, and other than the normal current loop. The current is suppressed from flowing in the place and the starting circuit isResistanceSince it is comprised by resistance and a capacitor | condenser, it can be set as the starting circuit of a cheap and simple structure.
[0035]
According to a third aspect of the present invention, there is provided a discharge lamp lighting device comprising: a discharge lamp; and the high-frequency inverter according to the first or second aspect having the discharge lamp as a load.
[0036]
As the discharge lamp, a fluorescent lamp or the like can be used.
[0037]
Since the discharge lamp is used as a load, a current-limiting impedance is connected in series as a ballast means to compensate for the negative characteristics.
[0038]
When an inductance is used as the current limiting impedance, a small feedback means can be configured by adding one auxiliary winding to the inductance by magnetic coupling.
[0039]
However, in the present invention, the feedback means may have any configuration.
[0040]
Further, a series resonance circuit having a current-limiting inductance as a constituent element can be added to the load circuit to regulate the operating frequency of the high-frequency inverter.
[0041]
Further, the discharge lamp can be connected to the load circuit via the insulation transformer with an insulation transformer interposed.
[0042]
However, it may be directly connected without using an insulating transformer. Direct connection is effective for downsizing the entire discharge lamp lighting device. In the case of direct connection, a coupling capacitor is preferably connected in series with the discharge lamp so that a direct current does not flow through the discharge lamp as a load.
[0043]
According to the discharge lamp lighting device of the third aspect, the discharge lamp having the effect of the first or second aspect can be provided.
[0044]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0045]
FIG. 1 is a circuit diagram showing an embodiment of a high-frequency inverter and a discharge lamp lighting device according to the present invention.
[0046]
In the figure, 1 is an AC power supply, 2 is an overcurrent fuse, 3 is a noise prevention circuit, 4 is a rectified DC power supply, SN is an N-channel FET, SP is a P-channel FET, GC is a gate circuit, and ST is a starting circuit. , PT is a gate protection means, and LC is a load circuit.
[0047]
The AC power source 1 is a commercial 100V AC power source.
[0048]
The overcurrent fuse 2 is formed of, for example, a pattern fuse integrally formed on the wiring board, and protects the circuit from being burned out when the overcurrent flows and the circuit from burning.
[0049]
The noise prevention circuit 3 includes an inductance L1 interposed in series between the AC power supply 1 and the rectified DC power supply 4, a parallel connection to the AC power supply 1 on the AC power supply 1 side of the inductance L1, and a reverse L together with the inductance L1. The high-frequency noise generated by the operation of the high-frequency inverter is removed so as not to flow to the power source side.
[0050]
The rectified DC power supply 4 includes a bridge-type full-wave rectifier circuit 4a and a smoothing circuit 4b.
[0051]
The bridge-type full-wave rectifier circuit 4a has an AC input terminal connected to the AC power source 1 via the noise prevention circuit 3, and a DC output terminal connected to the smoothing circuit 4b.
[0052]
The smoothing circuit 4b includes a series resistor R1 and a smoothing capacitor C2.
[0053]
The series resistor R1 has a resistance value of several ohms or less, and acts to reduce the harmonics by gradually reducing the current waveform when the charging current flows into the smoothing capacitor C2.
[0054]
The drain of the N channel type FET SN is connected to the positive electrode of the smoothing capacitor C2.
[0055]
On the other hand, the P channel type FET SP has its source connected to the saw of the N channel type FET SN and its drain connected to the negative electrode of the smoothing capacitor C2.
[0056]
The gate circuit GC comprises feedback means S, series resonance circuit SR, and gate voltage output means OG.
[0057]
The feedback means S includes an auxiliary winding that is magnetically coupled to a current limiting inductance L2 described later.
[0058]
The series resonance circuit SR is composed of a series circuit of an inductance L3 and a capacitor C3, and both ends thereof are connected to both ends of the feedback means S.
[0059]
The gate voltage output means OG is configured to take out the resonance voltage appearing at both ends of the capacitor C3 of the series resonance circuit SR via the capacitor C4. One end of the capacitor C4 is connected to a connection point between the capacitor C3 and the inductance L3, and the other end of the capacitor C4 is connected to the gates of the N channel type FET SN and the P channel type FET SP.
[0060]
Furthermore, the other end of the capacitor C3 is connected to the source of each FET. In this way, the resonance voltage appearing across the capacitor C3 is applied between the gate and source of each FET via the gate voltage output means OG.
[0061]
The starting circuit ST includes resistors R2, R3, R4 and a capacitor C4.
[0062]
The resistor R2 has one end connected to the positive electrode of the smoothing capacitor C2, the other end connected to the gate of the N-channel FET SN, and one end of the resistor R3 and the gate side of the gate voltage output means OG of the gate circuit GC. The output is connected to the other end of the capacitor C4.
[0063]
The other end of the resistor R3 is connected to a connection point between the inductance L3 of the series resonance circuit LC and the feedback means S.
[0064]
One end of the resistor R4 is connected to the connection point of the FETs SN and SP, that is, the source and the output side on the source side of the gate voltage output means OG, and the other end is connected to the negative electrode of the smoothing capacitor C2.
[0065]
The gate protection means PT is connected to the gate voltage output means OG by connecting a pair of Zener diodes in reverse polarity in series.
[0066]
The load circuit LC includes a discharge lamp DL, which is a load, a current limiting inductance L2, a coupling capacitor C5, and a resonance capacitor C6.
[0067]
The discharge lamp DL uses a fluorescent lamp. One electrode of the discharge lamp DL is connected to one end of the coupling capacitor C5, and the other end is connected to the drain of the P-channel type FET SP.
[0068]
The resonance capacitor C6 is connected to the non-power supply side terminal of the lower filament electrode in the figure of the discharge lamp DL. This filament electrode is heated by the current flowing through the resonant capacitor C6.
[0069]
The current-limiting inductance L2 has one end connected to the sources of the FETs SN and SP and the other end connected to the other end of the coupling capacitor C5.
[0070]
The resonant capacitor C6 is connected in parallel with the discharge lamp DL.
[0071]
Thus, the load circuit LC forms a series resonance circuit including a current limiting inductance L2, a capacitor C5, and a resonance capacitor C6.
[0072]
Further, a capacitor C7 is connected between the source and drain of the P-channel FET SP, and the load during the switching period of the P-channel FET SP is reduced.
[0073]
Next, the circuit operation in this embodiment will be described.
[0074]
When the AC power source 1 is turned on, a DC voltage smoothed by the rectified DC power source 4 appears across the smoothing capacitor C2. A DC voltage is applied between the drains of the N-channel FET SN and P-channel FET SP connected in series. However, since no gate voltage is applied to both FETs SN and SP, both FETs SN and SP remain off.
[0075]
Since the DC voltage is simultaneously applied to the starting circuit ST, a voltage corresponding to an appropriate proportion of the resistance values of the resistors R2, R3, and R4 appears at both ends of the capacitor C4 and the resistor R3. The terminal voltage of the capacitor C4 and the resistor R3 is applied as a positive voltage between the gate and source of each FET. As a result, the N-channel type FET SN is set to exceed the threshold voltage, and is turned on. On the other hand, the voltage applied between the gate and source of the P-channel type FET SP has the opposite polarity to the required gate voltage, and therefore remains off.
[0076]
When the N-channel FET SN is turned on, a current flows from the rectified DC power source 4 through the load circuit LC, that is, the current-limiting inductance L2, the coupling capacitor C5, and the resonance capacitor C6 through the drain and source of the N-channel FET SN. The series resonance circuit of the current limiting inductance L2, the coupling capacitor C5, and the resonance capacitor C6 of the load circuit LC resonates and the terminal voltage of the resonance capacitor C6 increases.
[0077]
On the other hand, when a current flows through the current-limiting inductance L2, a voltage is induced in the feedback means S that are magnetically coupled.
[0078]
The series resonance circuit SR starts series resonance by the voltage induced in the feedback means S by the current. Due to this series resonance, a boosted negative voltage is generated in the capacitor C3, so that it is regulated to a constant voltage by the gate protection means PT, and the gates of the P-channel type FET SP and the N-channel type FET SN via the gate voltage output means OG. • Applied between sources. As a result, the gate of the P-channel FET SP exceeds the threshold voltage and is turned on. On the other hand, the N-channel FET SN that has been turned on until now has a reverse polarity and does not have a predetermined gate voltage, so it is turned off.
[0079]
When the P-channel type FET SP is turned on, the electromagnetic energy accumulated in the current-limiting inductance L2 of the load circuit LC and the charge of the capacitor C6 are discharged, and the source / drain of the P-channel type FET SP and the closed circuit of the load circuit LC are discharged. A current flows in a direction opposite to that when the N-channel FET SN is turned on.
[0080]
On the other hand, since one electrode of the discharge lamp DL is heated by the current flowing through the resonance capacitor C6, electron emission is performed in the discharge lamp DL.
[0081]
Since a high resonance voltage appearing at both ends of the resonance capacitor C6 is applied to the discharge lamp DL together with the electron emission, the discharge lamp DL starts up and lights up.
[0082]
The current that flows when the P-channel FET SP is turned on causes a current having the same polarity as the current that has flowed through the starting circuit ST to flow in the feedback means S, so that the N-channel FET SN is turned on again and the P-channel FET SP is turned off. Thereafter, the FETs SN and SP are alternately turned on and off, and the discharge lamp DL is lit at high frequency.
[0083]
A case will be described in which the discharge lamp lighting device of the present embodiment deteriorates with time and the FET deteriorates. In addition to the lifetime, the cause of FET degradation also occurs when undesired current flows through the FET due to changes in lamp characteristics or tracking in the secondary circuit, or when excessive voltage is applied to the FET. obtain.
[0084]
When the N-channel type FET SN deteriorates and no on / off operation is performed, the start operation itself is not performed, so that oscillation does not occur.
[0085]
On the other hand, when the P-channel FET SP is deteriorated, the N-channel FET SN is turned on by the starting circuit ST. However, since the resonance oscillation does not operate normally due to the deterioration of the P channel type FET SP, even if the P channel type FET SP is turned on, no current flows to turn on the N channel type FET SN again in the feedback means S. Since no voltage is generated in ST, the oscillation stops without the N-channel FET SN being turned on again.
[0086]
FIG. 3 is a schematic front view of a bulb-type fluorescent lamp which is an embodiment of the discharge lamp lighting device of the present invention, and shows the internal structure through for explanation.
[0087]
Reference numeral 10 denotes a bulb-type fluorescent lamp, which accommodates therein a fluorescent lamp (light emitting tube) 8 as a discharge lamp DL. The bulb-type fluorescent lamp 10 includes a cover 14 having a base 12, a high-frequency inverter 16 housed in the cover 14, and a globe 17 having translucency, and the fluorescent lamp 8 is housed in the globe 17. And the envelope comprised from the glove | globe 17 and the cover 14 is formed in the external shape which approximates the standard dimension of the incandescent lamp of rated power 60W. That is, the lamp length H including the base 12 is about 120 mm to 125 mm, the diameter, that is, the outer shape D1 of the globe 17 is about 60 mm, and the maximum diameter D2 of the cover 14 is about 40 mm. In the following description, the base 12 side is the upper side and the globe 17 side is the lower side.
[0088]
The cover 14 includes a cover main body 21 formed of a heat resistant synthetic resin such as polybutylene terephthalate (PBT). The cover body 21 has a substantially cylindrical shape that expands downward, and an upper end portion is covered with a base 12 such as an Edison type E26 type, and is fixed by an adhesive or caulking.
[0089]
The globe 17 is transparent or light diffusing milky white or the like, and is formed of glass or synthetic resin into a smooth curved surface having substantially the same shape as the glass bulb of the incandescent bulb.
[0090]
The high-frequency inverter 16 accommodated in the cover 14 includes a circuit board (PC board) 24 that is horizontally arranged, that is, perpendicular to the longitudinal direction of the fluorescent lamp 18, and on both sides of the circuit board 24, that is, on the base 12 side. A plurality of electrical components are mounted on a certain upper surface and a lower surface on the fluorescent lamp 8 side to constitute a high-frequency inverter lighting circuit. The circuit board 24 is substantially disk-shaped and has a diameter smaller than a substantially circle of 40 mm. A power supply lead wire (not shown) derived from the circuit board 24 is connected to the base 12 of the cover 14.
[0091]
The fluorescent lamp 8 is attached to a partition plate (not shown) as a holder that is a fluorescent lamp fixing member and a high-frequency inverter fixing member, and this partition plate is fixed to the cover 14. That is, an attachment hole is formed in the partition plate, and each end portion of the fluorescent lamp 8 is inserted and fixed by an adhesive or the like.
[0092]
The electrode 3 of the fluorescent lamp has a filament coil supported by a pair of lead wires 4. The lead wire 4 is an inner well that supports the filament coil, and a jumet wire that is pinch sealed at the end of the tubular bulb 1. The outer wells are led out to the outside through the jumet line. The outer wells of the lead wires 4 are electrically connected to electrical connection terminal pins (not shown) of the circuit board 24. One inner well is provided with auxiliary amalgam as required.
[0093]
The bulb-type fluorescent lamp 10 configured in this way has an input power rating of 14 W, and the arc tube 18 is applied with a high frequency of 12.5 W, a lamp current of 280 mA, a lamp voltage of 65 V, and three wavelengths. The total luminous flux is 810 lm due to the use of the light emitting phosphor.
[0094]
The bulb-type fluorescent lamp of the present embodiment has a portion near the base 12, for example, a portion of 30 mm from the vicinity of the base 12 to reduce the diameter so that it approaches a so-called general PS bulb size. The lamp shape can be realized. Therefore, the light bulb-type fluorescent lamp 10 can be widely mounted on a lighting fixture for an incandescent light bulb, can improve versatility, and can eliminate the uncomfortable feeling at the time of mounting, thereby improving the appearance.
[0095]
In this embodiment, the fluorescent lamp 8 is configured by connecting three U-shaped tubular bulbs 1, but the shape of the fluorescent lamp 8 is not limited to this, and for example, a U-shaped or H-shaped tube It is also possible to shorten the lamp length by arranging two, three, or four bodies in parallel, that is, forming a 4-axis, 6-axis, or 8-axis discharge path along the longitudinal direction.
[0096]
In the high-frequency inverter 16, one circuit board 24 is disposed horizontally, but a plurality of circuit boards may be provided.
[0097]
And the lighting fixture is comprised by mounting | wearing the fixture main body provided with sockets, such as an incandescent bulb, for the bulb-type fluorescent lamp 10 of each said structure. And in this structure, the lighting fixture provided with each effect of said lightbulb-type fluorescent lamp 10 can be comprised.
[0098]
【The invention's effect】
  According to the high frequency inverter of the first aspect, since the complementary FET is used and the starting circuit for generating the gate voltage in the capacitor of the gate circuit is provided, the circuit configuration can be simplified and the cost can be reduced.In addition, since it has a starting circuit that operates to turn on the N-channel FET first at the time of starting, even if the FET deteriorates, it stops oscillation before abnormal oscillation, so even if the insulation performance decreases due to dust, High voltage due to the resonance operation is not generated, and current is prevented from flowing in a place other than the normal current loop.
[0099]
  According to the high frequency inverter of claim 2,Start circuitResistanceSince it is comprised by resistance and a capacitor | condenser, it can be set as the starting circuit of a cheap and simple structure.
[0100]
According to the discharge lamp lighting device of the third aspect, the discharge lamp having the effect of the first or second aspect can be provided.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of a high-frequency inverter and a discharge lamp lighting device according to the present invention.
FIG. 2 is a schematic front view showing a light bulb shaped fluorescent lamp which is an embodiment of a discharge lamp lighting device of the present invention.
[Explanation of symbols]
4 ... DC power supply, DL, 8 ... discharge lamp, SN ... N-channel FET, SP ... P-channel FET, ST ... starting circuit, 16 ... high frequency inverter.

Claims (3)

DC power supply;
An N-channel FET and a P-channel FET connected in series between the DC power sources and having their gates and sources connected in common;
A load circuit operating at a high frequency generated by alternating switching of an N-channel FET and a P-channel FET;
Feedback means for feeding back the load current of the load circuit, a series resonance circuit that resonates with the feedback voltage, and a capacitor that outputs a positive and negative gate voltage based on the resonance voltage of the series resonance circuit, the gate voltage output by this capacitor A gate circuit acting in common on the N-channel FET and the P-channel FET to alternately switch the N-channel FET and the P-channel FET;
One end has a positive resistance connected to the positive electrode of the DC power supply and the other end connected to the gate circuit, and one end has a negative resistance connected to the gate circuit and the other end connected to the negative electrode of the DC power supply. The negative side resistor forms a series body via the gate circuit, and when a DC voltage is applied from the DC power source, the gate voltage is generated in the capacitor of the gate circuit via the positive side and negative side resistors to form the N channel. A starting circuit that first turns on the FET ;
A high-frequency inverter characterized by comprising: Starting circuit a high-frequency inverter according to claim 1, wherein that you have been a resistor and capacitor make generates a voltage between the gate and source common contact of the gate circuit. A discharge lamp;
The high-frequency inverter according to claim 1 or 2, wherein a discharge lamp is used as a load;
A discharge lamp lighting device comprising:

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