JP2002078347A - Inverter device, discharge lamp lighting device, and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter device, a discharge lamp lighting device, and luminaire where stable switching operation can be consistently made, regardless of the state of load circuit. SOLUTION: A switching circuit 2 for converting direct-current power supply 1 into high-frequency waves, a load circuit 4 connected with the output point of the switching circuit 2, and a driver circuit 3 for driving the switching circuit 2 are provided. The switching circuit 2 comprises an N-channel FET 2a and a P-channel FET 2b into a complementary connection, and the driver circuit 3 is connected with the output point of the switching circuit 2, independently of the load circuit 4 and feeds back voltage produced in the driver circuit 3 for driving the switching circuit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter for supplying high frequency power to a load.

[0002]

2. Description of the Related Art FIG.
No. 84, a circuit diagram of a fluorescent lamp lighting device, FIG.
FIG. 7 is a block diagram of FIG. In the figure, reference numeral 1 denotes a power supply circuit, in which 1a is a diode bridge, and 1b is a smoothing capacitor. 2 is a switching circuit 2 in which 2a is an N-channel MOS
The FET 2b is a P-channel MOSFET. Reference numeral 3 denotes a driver circuit, 3f denotes a resonance inductor, 3g denotes a resonance capacitor, 3h denotes a capacitor,
d and 3e are constant voltage diodes, and 3i is a secondary winding of a ballast coil 4a described later. Reference numeral 4 denotes a load circuit, in which 4a is a ballast coil, 4b is a lamp,
c is a starting capacitor, and 4d is a coupling capacitor. Reference numeral 5 denotes a starting circuit.
Reference numerals a, 5b and 5c denote starting resistors, and 8 denotes a commercial power supply.
As described above, the configuration is such that the load circuit 4 and the driver circuit 3 are connected by the ballast coil 4a and the secondary winding 3i.

Next, the operation will be described. Commercial power supply 8
Is subjected to full-wave rectification by a diode bridge 1a constituting the power supply circuit 1, and is smoothed by a smoothing capacitor 1b to be converted to direct current. The DC power supply is a switching circuit 2
And the switching elements 2a and 2b are alternately turned on.
The high-frequency current that is converted to a high frequency by being turned off and output is supplied to a discharge lamp (hereinafter, “lamp”) of the load circuit 4.
4b). The switching circuit 2 comprises an N-channel MOSFET 2a and a P-channel MOSFET 2b. Both MOSFETs are complementary-connected, the drain terminal of the N-channel MOSFET 2a is connected to the DC power source 1, the source terminals of both MOSFETs are connected to each other, and the P-channel MOSFET 2b is connected. The drain terminal is grounded and both gate terminals are connected to each other.

During stable operation, MOSFETs 2a and 2b
Are driven by the driver circuit 3. The driver circuit 3 takes a voltage from the secondary winding 3i of the ballast coil 4a, forms a voltage resonance circuit with the resonance inductor 3f and the resonance capacitor 3g, and generates a resonance voltage generated in the resonance inductor 3f and the resonance capacitor 3g. And the capacitor 3
The gate signal of the MOSFETs 2a and 2b is set via the signal h. The N-channel MOSFET 2a turns on when the voltage of the gate terminal with respect to the source terminal takes a positive value, and turns off when the voltage is near 0 V or a negative value. On the other hand, P-channel MO
The SFET 2b turns on when the voltage of the gate terminal takes a negative value with respect to the source terminal, and turns off when the voltage is near 0 V or positive.
FF. Accordingly, the obtained gate signal alternately inverts the positive side and the negative side with reference to the common source terminal, so that the switching circuit 2 is driven in that cycle, and both MOSFETs are simultaneously turned on. Never. At this time, the MOSFET used by the gate signal voltage
Constant voltage diodes 3d and 3d so as not to exceed the rated value of
e is connected in series with the anode and cathode reversed, and inserted between the source terminal and the gate terminal.

The load circuit 4 is connected to the output of the switching circuit 2 and includes a ballast coil 4a, a lamp 4b, a starting capacitor 4c, and a coupling capacitor 4d. The lamp 4b and the starting capacitor 4c are connected in parallel, and 4a, the lamp 4b and the coupling capacitor 4d are connected in series.

Further, before the stable lighting, that is, at the time of starting, it is driven by the starting circuit 5. The starting circuit 5 includes a resistor 5a,
5b and 5c or constant voltage diodes 3d and 3e. After the power is turned on, the DC voltage of the power supply circuit 1 is divided, a predetermined voltage is applied to the gate of the N-channel MOSFET 2a, and the N-channel MOSFET 2a is first turned on.
I do. Once the N-channel MOSFET 2a turns ON,
A current flows from the DC power supply 1 to the load circuit 4, and the voltage obtained from the secondary winding of the ballast coil 4a causes the driver circuit 3 to start oscillating and reach stable operation.

[0007]

However, the fluorescent lamp lighting device shown in the prior art has mainly five problems. The first problem is that a load such as overvoltage or overcurrent is imposed on the driver circuit in a transient state such as preheating or starting the lamp. Usually, when starting to turn on the lamp, the electrodes of the lamp are preheated, and then the discharge is started by applying a high voltage to the lamp. The period of preheating or high voltage application differs depending on the type of lamp and the design method, but high voltage must be applied to the lamp immediately before the lamp is discharged. At this time, the voltage applied to the ballast coil becomes several times (3 to 4 times) the voltage during stable lighting, and becomes the maximum during use. Accordingly, during a period in which a voltage several times the normal voltage is applied to the ballast coil, a corresponding voltage is also applied to the secondary winding 3i, and the energy generated there is consumed in the driver circuit. Therefore, the driver circuit has a high possibility that a failure will occur during this period.
The size cannot be reduced.

[0008] The second problem is that the brightness of the lamp greatly changes in response to a voltage change of the commercial power supply. In the configuration of the conventional example, as shown in FIG. 18B, during the dead time when the switching operation is reversed, as shown in FIG.
The resonance voltage waveform of f is discontinuous. This discontinuous period becomes longer as the voltage value of the power supply circuit increases, and becomes shorter as the voltage value decreases. Thus, the longer the discontinuous period, the longer the switching period, and the shorter the period, the shorter the switching period. Therefore, the switching frequency monotonously decreases with respect to the voltage value of the commercial power supply.

Regarding the output of the switching circuit, if the commercial power supply voltage increases, the switching frequency decreases and acts to increase the load current. Conversely, if the commercial power supply decreases, the switching frequency increases and the load current increases. It works in the direction of reduction. Therefore, if the voltage of the commercial power supply increases even a little, it increases due to the decrease in frequency in addition to the increase in the commercial power supply voltage. It will be darker than the rate of voltage decrease. Therefore, the brightness of the lamp varies greatly depending on the power supply environment in which the device is used. For the same reason, when the commercial power supply voltage rises, the power consumption of the apparatus increases more than that caused by the increase in the commercial power supply voltage, which is not preferable from the viewpoint of energy saving.

A third problem is that the ripple of the light output increases. FIG. 19A is a waveform diagram showing the relationship between the switching frequency and the lamp current with respect to the ripple of the power supply circuit output in the circuit shown in FIG.
Since the light output is almost proportional to the lamp current, the lamp current is used here as an index of the light output. Normally, the output of the power circuit is converted to DC by a smoothing capacitor, etc.
There is a limit to increasing the capacity for reducing the size of the smoothing capacitor or reducing the high frequency. Therefore, the output voltage of the power supply circuit has a pulsating current synchronized with the commercial power supply as shown in FIG. At this time, as in the second problem, the switching frequency is high in the valley of the pulsating flow and low in the hill. As a result, as shown in FIG.
As compared with the case of driving at a completely constant switching frequency as shown in (b), the load current becomes smaller at the trough of the pulsating flow of the output voltage of the power supply circuit and becomes larger at the peak. Therefore, the ripple of the lamp current becomes large and the light output not only has a ripple, but also the luminous efficiency of the lamp deteriorates, which is not preferable from the viewpoint of energy saving.

[0011] A fourth problem is that performance variations of components easily affect output variations. In the driver circuit 3 shown in FIG. 16, the switching frequency is mainly determined by the resonance inductor 3f and the resonance capacitor 3g that constitute the resonance circuit. In the circuit configuration of FIG. 16, the gate capacitance and the capacitor of both MOSFETs 2a and 2b are set. The series circuit of 3h is connected in parallel with the resonance capacitor 3g. Normally, a capacitor 3h having a capacity sufficiently larger than the gate capacity is used, so that the effect can be ignored. However, usually, the capacity of the resonance capacitor 3g is close to the gate capacity, so that the variation of the gate capacity is affected by the switching frequency. Influence is inevitable.
In addition, it is very difficult to select a MOSFET by managing the gate capacitance, and an unmanageable element will contribute to the frequency determination.

A fifth problem is that the cost of parts is increased because the ballast coil 4a has the secondary winding 3i.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can provide a stable switching operation irrespective of the state of a load circuit with a simple configuration. It is an object of the present invention to provide an inverter device, a discharge lamp lighting device, and a lighting device capable of suppressing fluctuations and fluctuations in circuit power consumption.

[0014]

An inverter device according to the present invention includes a switching circuit for converting a DC power supply to a high frequency, a load circuit connected to an output point of the switching circuit, and a driver circuit for driving the switching circuit. Wherein the switching circuit comprises a complementary-connected N-channel FET and a P-channel FET.
The driver circuit is connected to an output point of the switching circuit independently of the load circuit, and feeds back a voltage generated in the driver circuit to drive the switching circuit.

The driver circuit drives the switching circuit at a frequency that monotonically increases with respect to the voltage value when the voltage of the DC power supply is higher than the rated voltage.

The driver circuit has a point having a predetermined voltage value higher than the potential of the ground point and lower than the voltage of the DC power supply;
It is connected between the output point of the switching circuit.

The predetermined voltage value is one half of the voltage of the DC power supply.

The driver circuit is connected between a point for dividing the DC power supply and an output point of the switching circuit.

Further, the driver circuit comprises a resonance circuit including an inductor and a capacitor.

A power supply circuit for converting a commercial power supply to DC;
A switching circuit for converting the output of the power supply circuit to a high frequency, a load circuit connected to an output point of the switching circuit, a driver circuit for driving the switching circuit,
The switching circuit is composed of complementary-connected N-channel FETs and P-channel FETs, and in the load circuit, between an output point of the driver circuit and a ground point terminated from the output point of the switching circuit. Or, it has a coupling capacitor connected between the output point of the power supply circuit, the driver circuit,
A resonance circuit of a capacitor and an inductor is connected between an output point of the switching circuit and the coupling capacitor, and extracts a gate signal of the switching circuit from the resonance circuit.

A power supply circuit for converting a commercial power supply into DC power;
A switching circuit for converting the output of the power supply circuit to a high frequency, a load circuit connected to an output point of the switching circuit, a driver circuit for driving the switching circuit,
The switching circuit is composed of an N-channel FET and a P-channel FET which are complementary connected, and in the load circuit, between a ground point terminated from the output point of the switching circuit and an output point of the power supply circuit. The driver circuit has two coupling capacitors connected in series, and the driver circuit has a resonance circuit of a capacitor and an inductor connected between an output point of the switching circuit and a connection point of the two coupling capacitors. The gate signal of the switching circuit is extracted from the resonance circuit.

A power supply circuit for converting a commercial power supply into DC power;
A switching circuit that converts the output of the power supply circuit to a high frequency, a driver circuit that drives the switching circuit, and a load circuit that is connected to an output point of the switching circuit, wherein the switching circuit is complementarily connected. N channel FET and p channel FE
T, the driver circuit is connected to the output point of the switching circuit via a driver power supply capacitor from an output point of a power supply circuit or from a ground point, and comprises a resonance circuit of a capacitor and an inductor. The gate signal of the switching circuit is extracted from the circuit.

A power supply circuit for converting a commercial power supply to DC;
A switching circuit for converting an output of the power supply circuit into a high frequency, a driver circuit for driving the switching circuit, and first and second driver power supplies connected in series between an output point of the power supply circuit and a ground point. A capacitor, and a load circuit connected to an output point of the switching circuit, wherein the switching circuit includes N-channel FETs and P-channel FETs connected in a complementary manner. A resonance circuit of a capacitor and an inductor is connected between a point and a connection point of the first and second driver power supply capacitors, and a gate signal of the switching circuit is extracted from the resonance circuit.

Also, a rectifier circuit for rectifying a commercial power supply, a smoothing circuit for smoothing the output of the rectifier circuit and converting the output to a direct current, the switching circuit for converting the output of the smoothing circuit to a high frequency, and a driving circuit for the switching circuit And a load circuit connected to an output point of the switching circuit, wherein the switching circuit comprises a complementary-connected N-channel FET and P-channel FE.
T, two smoothing capacitors are connected in series in the smoothing circuit, and a resonance between the capacitor and the inductor is provided between an output point of the switching circuit and a middle point of the two smoothing capacitors in the driver circuit. A circuit is connected to extract a gate signal of the switching circuit from the resonance circuit.

Also, a voltage doubler rectifier circuit for voltage doubler rectifying a commercial power supply, a switching circuit for converting the output of the voltage doubler rectifier circuit to a high frequency, a driver circuit for driving the switching circuit, and an output point of the switching circuit Wherein the switching circuit comprises an N-channel FET and a P-channel FET which are complementarily connected, and the driver circuit comprises an output point of the switching circuit and the voltage doubler rectifier circuit. Between the middle points of the two smoothing capacitors
A resonance circuit of a capacitor and an inductor is connected, and a gate signal of the switching circuit is extracted from a resonance voltage of the capacitor and the inductor.

In the driver circuit, the capacitor of the resonance circuit in which a capacitor and an inductor are connected in series is connected to an output point of the switching circuit, and a gate signal of the switching circuit is extracted from a connection point of the capacitor and the inductor. It is.

In the driver circuit, the capacitor of the resonance circuit in which the capacitor and the inductor are connected in series is connected to the output point of the switching circuit, and the connection point of the capacitor and the inductor is connected to the switching circuit of the switching circuit via a gate resistor. The gate signal is extracted.

In the driver circuit, two constant voltage diodes connected in series by connecting anodes or cathodes are connected in parallel to a capacitor constituting the resonance circuit via a gate resistor, and When the output of the circuit is equal to or higher than the rated voltage, a constant of a capacitor or an inductor, a gate resistor, or a constant voltage diode constituting a resonance circuit is set so as to have a period in which the two constant voltage diodes are turned on. .

Further, the discharge lamp lighting device according to the present invention comprises:
The load circuit of the inverter device according to claim 1, wherein a discharge lamp is connected.

Further, a lighting fixture according to the present invention incorporates the inverter device or the discharge lamp lighting device according to claims 1 to 16.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a circuit diagram showing a first embodiment of the present invention, FIG. 3 is an equivalent circuit of a driver circuit, FIGS. 6 and 7 are waveform diagrams showing the relationship between the switching frequency and the lamp current with respect to the ripple of the power supply circuit output. In the figure, 1 is a power supply circuit, in which 1a is a diode bridge, and 1b is a smoothing capacitor. Reference numeral 2 denotes a switching circuit, which is composed of an N-channel MOSFET 2a and a P-channel MOSFET 2b.
Connect the drain terminal of SFET2a and connect both MOSFETs
Source terminals of the P-channel MOSFET
The drain terminal of 2b is grounded, and both gate terminals are connected to each other.

3 is a driver circuit, and 6 is 1 / x of the power supply voltage.
(Hereinafter referred to as “driver power supply”). The driver circuit 3 is connected between the output point of the switching circuit 2 and the driver power supply 6, and its gate signal output is configured to have a symmetric waveform with respect to the potential of the common source terminal.

The driver circuit 3 includes an inductor 3
a, a capacitor 3b, a gate resistor 3c, and constant voltage diodes 3d and 3e.
The series circuit b is inserted between the coupling capacitor 4d and the source connection point in the switching circuit 2 by connecting the inductor 3a to the coupling capacitor 4d side. A gate resistor 3c is connected between a connection point between the inductor 3a and the capacitor 3b and the gate terminals of the MOSFETs 2a and 2b. Also, the MO used by the gate signal voltage
Constant voltage diode 3 so as not to exceed the rated value of SFET
d and 3e are connected in series with the anode and cathode reversed, and inserted between the source terminal and the gate terminal. In addition,
In the present embodiment, two constant voltage diodes are used with their anodes connected, but the cathodes may be connected with each other.

Reference numeral 4 denotes a load circuit, and a switching circuit 2
, The ballast coil 4a, the lamp 4b,
The lamp 4b and the starting capacitor 4c are connected in parallel, and the ballast coil 4a, the lamp 4b and the coupling capacitor 4d are connected in series. The voltage generated at the coupling capacitor 4d is the MOSFET 2a and the MOSFET 2a.
If b is driven at the same on-duty, the coupling capacitor 4d is used in the present embodiment, utilizing the fact that the voltage value is constant at の of the output of the power supply circuit regardless of the lamp state. Is equivalent to the driver power supply 6.

Reference numeral 5 denotes a starting circuit. In this circuit,
5a and 5b are starting resistors, 8 is a commercial power supply, and the starting circuit 5 is configured such that the resistor 5a is connected between the drain terminal and the gate terminal of the N-channel MOSFET 2a, and the resistor 5b is connected to the P-channel MO.
It is configured to be connected between the source terminal and the drain terminal of the SFET 2b.

Next, the outline of the operation will be described. The commercial power supply 8 is a diode bridge 1a constituting the power supply circuit 1.
, And is smoothed by the smoothing capacitor 1b to be DC. The DC power is applied to the switching circuit 2 and is converted into a high frequency by alternately turning on and off the switching elements 2a and 2b. The output high-frequency current turns on the lamp 4b of the load circuit 4.

Next, the operation until the stable operation is reached is shown in FIG.
This will be described below. The following four steps are required to reach stable operation. The charge / discharge of the charge in the capacitor 3b or the sign of the voltage will be described in each embodiment with reference to the source connection point side. (1) When commercial power is turned on, a current flows from the output of the power supply circuit 1 to the driver circuit 3 via the resistor 5a,
a, a voltage divided by a series circuit of the constant voltage diodes 3d, 3e and the resistor 5b is applied to the gate, and when reaching a predetermined potential, the N-channel MOSFET 2a is turned on.
Further, before the gate voltage reaches a predetermined potential, charge is accumulated in the capacitor 3b via the resistor 5a and the gate resistor 3c.

(2) N-channel MOSFET 2a is ON
Then, a current flows through the power supply circuit 1 → N-channel MOSFET 2a → capacitor 3b → inductor 3a → coupling capacitor 4d. At this time, the N-channel MOSFE
The charge stored before T2a turns on maintains the N-channel MOSFET 2a on. It is assumed that the gate resistance 3c is sufficiently smaller than the resistance 5a, and that the presence of the resistance 5 can be ignored after startup. Thereafter, the electric current stored in the capacitor 3b is discharged by the flow of the current, the gate voltage is inverted from positive to negative, and the MOSFET 2a is turned off and the MOSFET 2b is turned on.

(3) P-channel MOSFET 2b is ON
After that, the energy stored in the inductor 3a causes the inductor 3a → the coupling capacitor 4d → P
A current flows from the built-in regenerative diode of the channel MOSFET 2b to the capacitor 3b, and thereafter, the current is inverted. When the current is reversed, the capacitor 3b starts to be charged again, and the voltage of the capacitor 3b changes from negative to positive.

(4) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
A current flows through a path from the built-in regenerative diode of the SFET 2a to the power supply circuit 1, and thereafter, the current is inverted and the capacitor 3b
Is discharged, the gate voltage changes from positive to negative, and MOSFE
T2a is OFF and 2b is ON. Thereafter, by repeating the above (3) and (4), stable operation is achieved.

Next, the details of the operation of the driver circuit 3 during stable operation will be described with reference to FIGS. FIG. 3A is an equivalent circuit of the driver circuit 3 when the N-channel MOSFET 2a is ON, and FIG. 3B is an equivalent circuit when the P-channel MOSFET 2b is ON. In both figures, Cissa and Cis
sb is the gate capacitance of each of the MOSFETs 2a and 2b. 3A and 3B, the gate resistance 3c
As seen from the above, since the impedance of the inductor 3a and the capacitor 3b is low and the gate side is high, the operation of the inductor 3a and the capacitor 3b is not affected by the gate capacitance.

With the circuit shown in FIG. 3A, basically, the switching circuit 2 is driven at a frequency governed by the resonance frequency f of the inductor 3a and the capacitor 3b. Assuming that the inductance of the inductor 3a is L and the capacitance of the capacitor 3b is C, f = 1 / (2π (LC) ^-1/2 ), and the voltage generated in the capacitor 3b is Vb (based on the source connection point). ), Vb is applied to the gate terminal with a delay of a time constant formed by the gate resistance 3c and the gate capacitance Cissa + Cissb.

In practice, the gate voltage is clamped by the constant voltage diodes 3d and 3e. The period during which the clamp is performed is equivalent to a case where a new resistor is connected in parallel to the capacitor 3b via the gate resistor 3c. As shown in FIG. 4, ω becomes smaller than the unclamped period, and as a result, the oscillation frequency becomes higher. The oscillation frequency of the driver circuit 3 in this case is
Let f + Δf. As a result, the gate waveform during operation and the voltage generated in the inductor 3a are as shown in FIG. That is, as shown in the drawing, the voltage generated in the inductor 3a has a continuous waveform even during the dead time, and the operation during the dead time does not affect the switching frequency.

Here, when the output voltage of the power supply circuit 1 rises, Vb also increases in proportion thereto, and the period of clamping by the constant voltage diodes 3d and 3e becomes longer,
Δf also increases. When the output voltage of the power supply circuit 1 decreases, Δf decreases. Therefore, if the output voltage of any power supply circuit 1 is configured to have a period in which the gate voltage is clamped, the switching frequency is monotonic with respect to the ripple of the power supply circuit output voltage, as shown in FIG. Because of the increase, the ripple of the lamp current is also reduced.

Further, when the output of the power supply circuit 1 is in a rated state, or when the voltage value of the commercial power supply 8 is a rated output, the constant voltage diode 3d is set so that the gate voltage becomes equal to the voltage value of the constant voltage diode. If 3f is set so that Δf = 0, the gate voltage is clamped and the oscillation frequency rises only when the power supply voltage rises, and becomes constant when the power supply voltage is below the rating. it can.
At this time, as shown in FIG. 7, since the switching frequency is constant or monotonically increased with respect to the ripple of the output voltage of the power supply circuit, the ripple of the lamp current is further reduced.

Although the coupling capacitor 4d is connected to the ground side in this embodiment, the power supply circuit 1
A circuit having the same operation can be obtained by connecting to the output side.

As described above, the coupling capacitor 4
Since the driver circuit 3 is configured by using the potential difference of E / 2 generated between d and the output of the switching circuit 2, even during a transitional period for the lamp such as when starting the lamp, the same as during normal lighting. Operation can be obtained. In addition, since it can be driven at a constant or monotonically increasing frequency with respect to power supply voltage fluctuations, it is possible to suppress light output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations, and also reduce optical output ripple, The lamp can be turned on without impairing luminous efficiency. Further, since the configuration is such that the gate capacitance does not affect the oscillation frequency, it is possible to easily manage variations in the output frequency. In addition, this makes it possible to configure an apparatus having a simple configuration with a small number of components, so that it can be applied to a circuit that requires miniaturization, such as a bulb-type fluorescent lamp apparatus.

Embodiment 2 In the first embodiment,
Although the configuration is such that the coupling capacitor 4d is used as the driver power supply 6, an embodiment in which the driver power supply capacitor is independent will be described below. FIG. 8 is a circuit diagram showing a second embodiment of the present invention. The block diagram is similar to FIG. 8, 1 to 5 and the inside thereof and 8
Are the same in configuration and operation as those in the first embodiment, and therefore description thereof is omitted. In FIG. 8, reference numeral 6a denotes a capacitor constituting the driver power supply 6. Note that, as in the case of the first embodiment, half the voltage of the power supply circuit 1 is applied to the capacitor 6a.

Next, the operation will be described with reference to FIG. The following four steps are required to reach stable operation. (1) When commercial power is turned on, the power supply circuit 1
A current flows through the driver circuit 3 through the a, and a voltage divided by a series circuit of the resistor 5a, the constant voltage diodes 3a, 3b, and the resistor 5b is applied to the gate. When the voltage reaches a predetermined potential, the N-channel MOSFET 2a is turned on. Turn ON. In addition, before the gate voltage reaches a predetermined potential, charge is accumulated in the capacitor 3b via the gate resistor 3c.

(2) N-channel MOSFET 2a is ON
Then, a current flows through the power supply circuit 1 → N-channel MOSFET 2a → capacitor 3b → inductor 3a → capacitor 6a. At this time, the electric charge stored before the switching element 2a is turned on becomes the N-channel MOSFET 2a.
Is kept ON. The gate resistance 3c is equal to the resistance 5a
, And the existence of the resistor 5 can be neglected after startup. Thereafter, the electric charge stored in the capacitor 3b is discharged by the above-mentioned current flowing, the gate voltage is inverted from positive to negative, and the MOSFET 2a
Is OFF and 2b is ON.

(3) P-channel MOSFET 2b is ON
After that, the inductor 3a → the capacitor 6a → the P-channel MO
A current flows from the built-in regenerative diode of the SFET 2b to the capacitor 3b, and thereafter, the current is inverted. When the current is reversed, the capacitor 3b starts to be charged again, and the voltage of the capacitor 3b changes from negative to positive.

(4) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
A current flows through a path from the built-in regenerative diode of the SFET 2a to the power supply circuit 1, and thereafter, the current is inverted and the capacitor 3b
Is discharged, the gate voltage changes from positive to negative, and MOSFE
T2a is OFF and 2b is ON. Thereafter, by repeating the above (3) and (4), stable operation is achieved.

The details of the driver circuit 3 and the waveforms of the respective parts are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, since the driver circuit 3 is constructed by utilizing the potential difference of E / 2 between the capacitor 6a and the output of the switching circuit 2, the transient state of the lamp at the time of starting the lamp or the like. In the period, the same operation as in normal lighting can be obtained. Also, a coupling capacitor 4d and a capacitor 6a for the driver power supply 6
Are independent of each other, it is possible to select a capacitor according to each current value. In addition, since it can be driven at a constant or monotonically increasing frequency with respect to power supply voltage fluctuations, it is possible to suppress light output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations, and also reduce optical output ripple, The lamp can be turned on without impairing luminous efficiency.
Further, since the configuration is such that the gate capacitance does not affect the oscillation frequency, it is possible to easily manage variations in the output frequency. In addition, this makes it possible to configure an apparatus having a simple configuration with a small number of components, so that it can be applied to a circuit that requires miniaturization, such as a bulb-type fluorescent lamp apparatus.

Embodiment 3 In the second embodiment, the capacitor 6a for the driver power supply 6 is grounded.
In this configuration, the power supply circuit 1 is connected to the output side. FIG. 9 is a circuit diagram showing the third embodiment. The block diagram is similar to FIG. In FIG. 9, 1 to 5, the inside thereof, and 8 have the same configuration and operation as those of the first embodiment, and thus description thereof will be omitted. In FIG. 8, reference numeral 6a denotes a capacitor constituting the driver power supply 6, which is connected to the output side of the power supply circuit 1. In addition, similarly to the case of Embodiment 1,
A voltage that is half the voltage value of the power supply circuit 1 is applied to the capacitor 6a.

Next, the operation will be described with reference to FIG. The following four steps are required to reach stable operation. (1) When the commercial power is turned on, a current flows from the power supply circuit 1 to the capacitor 6a → the inductor 3a → the capacitor 3b → the ballast coil 4a → the starting capacitor 4c → the coupling capacitor 4d, and the voltage generated in the capacitor 3b is reduced. When applied to the gate and reaches a predetermined potential, the N-channel MOSFET 2a turns on. Further, before the gate voltage reaches a predetermined potential, electric charge is accumulated in the capacitor 3b via the inductor 3a.

(2) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
Regenerative diode built into SFET2a → Power supply circuit 1
→ Immediately after the current flows through the closed loop of the capacitor 6a, the current is reversed by the resonance action of the inductor 3a and the capacitor 3b. At this time, the N-channel MOSFET 2a
The electric charge stored in the capacitor 3b before the N is turned on and before the current is inverted is transferred to the N-channel MOSFET 2b.
Maintain ON of a. Note that the gate resistance 3c is equal to the resistance 5
It is assumed to be sufficiently smaller than a, and the existence of the resistor 5 can be neglected after startup. Thereafter, the electric charge stored in the capacitor 3b is discharged by the above-mentioned current flowing, the gate voltage is inverted from positive to negative, and the MOSFET 2
a is OFF and 2b is ON.

(3) P-channel MOSFET 2b is ON
After that, the energy stored in the inductor 3a causes the inductor 3a → the coupling capacitor 6a → P
A current flows from the built-in regenerative diode of the channel MOSFET 2b to the capacitor 3b, and thereafter, the current is inverted. When the current is reversed, the capacitor 3b starts to be charged again, and the voltage of the capacitor 3b changes from negative to positive.

(4) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
A current flows through a path from the built-in regenerative diode of the SFET 2a to the power supply circuit 1, and thereafter, the current is inverted and the capacitor 3b
Is discharged, the gate voltage changes from positive to negative, and MOSFE
T2a is OFF and 2b is ON. Thereafter, by repeating the above (3) and (4), stable operation is achieved.

The details of the driver circuit 3 and the waveforms of the respective parts are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, since the driver circuit 3 is configured by utilizing the potential difference of E / 2 between the capacitor 6a and the output of the switching circuit 2, the transient state of the lamp at the time of starting the lamp or the like. In the period, the same operation as in normal lighting can be obtained. Also, a coupling capacitor 4d and a capacitor 6a for the driver power supply 6
Are independent of each other, it is possible to select a capacitor according to each current value. In addition, since it can be driven at a constant or monotonically increasing frequency with respect to power supply voltage fluctuations, it is possible to suppress light output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations, and also reduce optical output ripple, The lamp can be turned on without impairing luminous efficiency.
Further, since the configuration is such that the gate capacitance does not affect the oscillation frequency, it is possible to easily manage variations in the output frequency. In addition, the starting circuit can also serve as a driver and a divided power supply, which makes it possible to configure a device having a simple structure with a small number of components, and is applied to a circuit such as a light-bulb-type fluorescent lamp device that requires miniaturization. be able to.

Embodiment 4 In Embodiments 1 and 2,
Although the configuration is such that the driver power supply is created by using the operation of the switching circuit, in the present embodiment, the configuration corresponding to the driver power supply is created independently of the switching circuit. FIG. 10 is a block diagram showing Embodiment 4 of the present invention. In the figure, 1 to 5 and the inside thereof are the same as those of the first embodiment, and therefore the description is omitted. Reference numeral 7 denotes a voltage dividing circuit for dividing the output point of the power supply circuit 1 and the ground point. The voltage dividing circuit 7 is composed of passive elements.
It is necessary that the impedance at the dividing point be low.

FIG. 11 is a circuit diagram showing a fourth embodiment of the present invention. In the figure, 1 to 4 and the inside and 8 are the same as those in the first embodiment, and therefore, the description is omitted. The starting circuit 5 includes a driver circuit 3, a voltage dividing circuit 7, and a resistor 5b for connecting a source connection point to a ground point. The voltage dividing circuit 7 includes a series circuit of capacitors 7a and 7b. The capacitors 7a and 7b do not need to have the same capacitance, but in the present embodiment, capacitors having the same capacitance are used.

Next, the operation will be described with reference to FIG.
The following four steps are required to reach stable operation. (1) When commercial power is turned on, capacitors 7a and 7b
From the point that the output of the power supply circuit 1 is divided, the current flows through the inductor 3a → the capacitor 3b → the ballast coil 4a → the starting capacitor 4c → the coupling capacitor 4d, and the voltage generated in the capacitor 3b is applied to the gate, and When voltage is reached, N-channel MOSFET
2a turns ON. Further, before the gate voltage reaches a predetermined potential, electric charge is accumulated in the capacitor 3b via the inductor 3a.

(2) N-channel MOSFET 2a is ON
Then, a current flows through the power supply circuit 1 → the N-channel MOSFET 2a → the capacitor 3b → the inductor 3a → the voltage dividing circuit 7. At this time, the charge stored before the N-channel MOSFET 2a is turned on is changed to the N-channel MOSFET 2a.
Maintain ON of a. Thereafter, the electric charge stored in the capacitor 3b is discharged by the above-mentioned current flowing, the gate voltage is inverted from positive to negative, and the MOSFET 2a
Is OFF and 2b is ON.

(3) P-channel MOSFET 2b is ON
After this, a current flows through the built-in regenerative diode of the P-channel MOSFET 2b → the capacitor 3b → the inductor 3a → the voltage dividing circuit 7 by the energy stored in the inductor 3a, and thereafter, the current is inverted. When the current reverses,
The capacitor 3b starts to be charged again, and the voltage of the capacitor 3b changes from negative to positive.

(4) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
A current flows through a path from the built-in regenerative diode of the SFET 2a to the power supply circuit 1, and thereafter, the current is inverted and the capacitor 3b
Is discharged, the gate voltage changes from positive to negative, and MOSFE
T2a is OFF and 2b is ON. Thereafter, by repeating the above (3) and (4), stable operation is achieved.

The details of the driver circuit 3 and the waveforms of the respective parts are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, since the driver circuit 3 is configured by utilizing the potential difference of E / 2 generated between the voltage dividing circuit 7 and the output of the switching circuit 2, the transient for the lamp at the time of starting the lamp or the like. In a typical period, the same operation as in normal lighting can be obtained. In addition, since it can be driven at a constant or monotonically increasing frequency with respect to power supply voltage fluctuations, it is possible to suppress light output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations, and also reduce optical output ripple, The lamp can be turned on without impairing luminous efficiency. Further, since the configuration is such that the gate capacitance does not affect the oscillation frequency, it is possible to easily manage variations in the output frequency. In addition, since the starting circuit can be used as both a driver circuit and a voltage dividing circuit, and a device with a small number of parts and a simple configuration can be configured, it is applied to a circuit that requires miniaturization, such as a compact fluorescent lamp device. be able to.

Embodiment 5 FIG. FIG. 12 is a circuit diagram showing Embodiment 5 of the present invention.
Is similar to FIG. In the figure, 1 to 5 and the inside and 8 are the same as those of the fourth embodiment, and therefore the description is omitted. A voltage dividing circuit 7 divides the voltage between the output point of the power supply circuit 1 and the ground point. In the present embodiment, the coupling capacitor 4d also serves as a part of the voltage dividing circuit. 7b
Is a capacitor.

Next, the operation will be described with reference to FIG. The following four steps are required to reach stable operation. (1) When the commercial power is turned on, the output of the power supply circuit 1 is divided by the capacitor 7a and the coupling capacitor 4d, so that the inductor 3a → the capacitor 3b → the ballast coil 4a → the starting capacitor 4c → the coupling capacitor 4d. A current flows, a voltage generated in the capacitor 3b is applied to the gate, and when a predetermined potential is reached, the N-channel MOSFET 2a is turned on. Further, before the gate voltage reaches a predetermined potential, electric charge is accumulated in the capacitor 3b via the inductor 3a.

(2) N-channel MOSFET 2a is ON
Then, a current flows through the power supply circuit 1 → the N-channel MOSFET 2a → the capacitor 3b → the inductor 3a → the voltage dividing circuit 7. At this time, the charge stored before the N-channel MOSFET 2a is turned on is changed to the N-channel MOSFET 2a.
Maintain ON of a. Thereafter, the electric charge stored in the capacitor 3b is discharged by the above-mentioned current flowing, the gate voltage is inverted from positive to negative, and the MOSFET 2a
Is OFF and 2b is ON.

(3) P-channel MOSFET 2b is ON
After this, a current flows through the built-in regenerative diode of the P-channel MOSFET 2b → the capacitor 3b → the inductor 3a → the voltage dividing circuit 7 by the energy stored in the inductor 3a, and thereafter, the current is inverted. When the current reverses,
The capacitor 3b starts to be charged again, and the voltage of the capacitor 3b changes from negative to positive.

(4) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
A current flows through a path from the built-in regenerative diode of the SFET 2a to the power supply circuit 1, and thereafter, the current is inverted and the capacitor 3b
Is discharged, the gate voltage changes from positive to negative, and MOSFE
T2a is OFF and 2b is ON. Thereafter, by repeating the above (3) and (4), stable operation is achieved.

The details of the driver circuit 3 and the waveforms of the respective parts are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, since the driver circuit 3 is configured by utilizing the potential difference of E / 2 generated between the voltage dividing circuit 7 and the output of the switching circuit 2, the transient for the lamp at the time of starting the lamp or the like. In a typical period, the same operation as in normal lighting can be obtained. In addition, since the coupling capacitor also serves as a part of the voltage divider circuit, and most of the starter circuit can also serve as the driver circuit and the voltage divider circuit, a simple device with a small number of components is required. It can be applied to a circuit that requires miniaturization, such as a bulb-type fluorescent lamp device. In addition, since it can be driven at a constant or monotonically increasing frequency with respect to power supply voltage fluctuations, it is possible to suppress light output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations, and also reduce optical output ripple, The lamp can be turned on without impairing luminous efficiency. Further, since the configuration is such that the gate capacitance does not affect the oscillation frequency, it is possible to easily manage variations in the output frequency.

Embodiment 6 FIG. FIG. 13 is a circuit diagram showing a sixth embodiment of the present invention, and the block diagram is the same as that of the first embodiment shown in FIG. In FIG. 13, reference numerals 1 a, 2 to 5, the inside thereof, and 8 are the same as those in the fifth embodiment, and thus description thereof will be omitted. In the power supply circuit 1, 1c and 1
d is a smoothing capacitor connected in series, and the driver power supply 6 is constituted by the smoothing capacitor 1d. Although the smoothing capacitors 1c and 1d do not need to have the same capacity, they have the same capacity in the present embodiment.

Next, the operation will be described with reference to FIG. The following four steps are required to reach stable operation. (1) When commercial power is turned on, the inductor 3a → the capacitor 3b → from the connection point of the smoothing capacitors 1c and 1d.
A current flows through the ballast coil 4a, the starting capacitor 4c, and the coupling capacitor 4d, and a voltage generated in the capacitor 3b is applied to the gate. When a predetermined potential is reached, the N-channel MOSFET 2a is turned on. Also, before the gate voltage reaches a predetermined potential, the capacitor 3b
Also, electric charges are accumulated via the inductor 3a.

(2) N-channel MOSFET 2a is ON
Then, a current flows from the power supply circuit 1 → the N-channel MOSFET 2a → the capacitor 3b → the inductor 3a → the driver power supply 6. At this time, the N-channel MOSFET 2a is turned on.
The charge stored before the N-channel MOSFE
Maintain ON of T2a. Thereafter, the electric charge stored in the capacitor 3b is discharged by the above-mentioned current flowing, the gate voltage is inverted from positive to negative, and the MOSFET 2
a is OFF and 2b is ON.

(3) P-channel MOSFET 2b is ON
After this, a current flows through the built-in regenerative diode of the P-channel MOSFET 2b → the capacitor 3b → the inductor 3a → the driver power supply 6 by the energy stored in the inductor 3a, and thereafter, the current is inverted. When the current is reversed, the capacitor 3b starts to be charged again, and the voltage of the capacitor 3b changes from negative to positive.

(4) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
A current flows through a path from the built-in regenerative diode of the SFET 2a to the power supply circuit 1, and thereafter, the current is inverted and the capacitor 3b
Is discharged, the gate voltage changes from positive to negative, and MOSFE
T2a is OFF and 2b is ON. Thereafter, by repeating the above (3) and (4), stable operation is achieved.

The details of the driver circuit 3 and the waveforms of the respective parts are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, since the driver circuit 3 is configured by utilizing the potential difference of E / 2 generated between the driver power supply 6 and the output of the switching circuit 2, the transient for the lamp at the time of starting the lamp or the like. The same operation as in the normal lighting can be obtained even in a short period. In addition, since the smoothing capacitor is configured to also serve as a part of the divided power supply, and most of the starting circuit is configured to also serve as the driver circuit and the divided power supply, an apparatus having a simple configuration with a small number of components can be configured. It can be applied to circuits that require miniaturization, such as a fluorescent lamp device. In addition, since it can be driven at a constant or monotonically increasing frequency even with fluctuations in the power supply voltage,
Light output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations can be suppressed. In addition, light output ripples are reduced, and the lamp can be turned on without impairing luminous efficiency. Further, since the configuration is such that the gate capacitance does not affect the oscillation frequency, it is possible to easily manage variations in the output frequency.

Seventh Embodiment FIG. 14 is a circuit diagram showing a seventh embodiment of the present invention, and the block diagram is the same as FIG. 1 of the embodiment. In FIG. 14, 2 to 5, the inside thereof, and 8 are the same as those in the sixth embodiment, and thus description thereof will be omitted. In the power supply circuit 1, 1c and 1d are smoothing capacitors, 1e and 1f are diodes, and constitute a voltage doubler circuit. The driver power supply 6 is constituted by the smoothing capacitor 1d. Although the smoothing capacitors 1c and 1d do not need to have the same capacity, they have the same capacity in the present embodiment.

Next, the operation will be described with reference to FIG. The following four steps are required to reach stable operation. (1) When commercial power is turned on, the inductor 3a → the capacitor 3b → from the connection point of the smoothing capacitors 1c and 1d.
A current flows through the ballast coil 4a, the starting capacitor 4c, and the coupling capacitor 4d, and a voltage generated in the capacitor 3b is applied to the gate. When a predetermined potential is reached, the N-channel MOSFET 2a is turned on. Also, before the gate voltage reaches a predetermined potential, the capacitor 3b
Also, electric charges are accumulated via the inductor 3a.

(2) N-channel MOSFET 2a is ON
Then, a current flows from the power supply circuit 1 → the N-channel MOSFET 2a → the capacitor 3b → the inductor 3a → the driver power supply 6. At this time, the N-channel MOSFET 2a is turned on.
The charge stored before the N-channel MOSFE
Maintain ON of T2a. Thereafter, the electric charge stored in the capacitor 3b is discharged by the above-mentioned current flowing, the gate voltage is inverted from positive to negative, and the MOSFET 2
a is OFF and 2b is ON.

(3) P-channel MOSFET 2b is ON
After this, a current flows through the built-in regenerative diode of the P-channel MOSFET 2b → the capacitor 3b → the inductor 3a → the driver power supply 6 by the energy stored in the inductor 3a, and thereafter, the current is inverted. When the current is reversed, the capacitor 3b starts to be charged again, and the voltage of the capacitor 3b changes from negative to positive.

(4) N-channel MOSFET 2a is ON
Then, by the energy stored in the inductor 3a, the inductor 3a → the capacitor 3b → the N-channel MO
A current flows through a path from the built-in regenerative diode of the SFET 2a to the power supply circuit 1, and thereafter, the current is inverted and the capacitor 3b
Is discharged, the gate voltage changes from positive to negative, and MOSFE
T2a is OFF and 2b is ON. Thereafter, by repeating the above (3) and (4), stable operation is achieved.

The details of the driver circuit 3 and the waveforms of each part are the same as those in the first embodiment, and a description thereof will be omitted.

As described above, since the driver circuit 3 is constructed by utilizing the potential difference of E / 2 between the driver power supply 6 and the output of the switching circuit 2, the transient for the lamp at the time of starting the lamp or the like. The same operation as in the normal lighting can be obtained even in a short period. In addition, since the series circuit of the smoothing capacitor is configured to also serve as a part of the voltage doubler rectifier circuit and the divided power supply, and most of the startup circuit is configured to also serve as the driver circuit and the divided power supply circuit, the number of parts is simple and the configuration is simple Since the power supply voltage can be set higher than the lamp voltage, the device can be downsized and can be applied to a wide range of models such as a dimming type. In addition, since it can be driven at a constant or monotonically increasing frequency with respect to power supply voltage fluctuations, it is possible to suppress light output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations.
In addition, the ripple of the light output is reduced, and the lamp can be turned on without impairing the luminous efficiency. Further, since the configuration is such that the gate capacitance does not affect the oscillation frequency, it is possible to easily manage variations in the output frequency.

Embodiment 8 FIG. FIG. 15 is a configuration diagram of a lighting fixture according to Embodiment 8 of the present invention. In the figure, 9
Is a circuit board, 10 is a base, 11 is a glove, and 12 is a cover. The circuit board 9 and the lamp 4b are the same as those of the first embodiment.
6 are lighting fixtures in which a base for supplying commercial power, a discharge lamp lighting device, and a housing are integrated.

As described above, since the number of components is small even if the circuits of any of the embodiments are used, a compact lighting fixture such as a bulb-type fluorescent lamp device can be constructed.

[0093]

As described above, the inverter device according to the present invention comprises a switching circuit for converting a DC power supply to a high frequency, a load circuit connected to an output point of the switching circuit, and a driver for driving the switching circuit. A switching circuit, wherein the switching circuit comprises a complementary-connected N-channel FET and a P-channel FE.
T, the driver circuit is connected to the output point of the switching circuit independently of the load circuit, and feeds back the voltage generated in the driver circuit to drive the switching circuit. With the configuration, a stable switching operation can always be obtained regardless of the state of the load circuit.

When the voltage of the DC power supply is equal to or higher than the rated voltage, the driver circuit drives the switching circuit at a frequency that monotonically increases with respect to the voltage value. Can be suppressed, and in addition, when the load is a lamp, the ripple of the light output is reduced, and the lamp can be turned on without impairing the luminous efficiency.

Also, the driver circuit has a point having a predetermined voltage value higher than the potential of the ground point and lower than the voltage of the DC power supply;
Since it is connected between the output point of the switching circuit and the load, the driver circuit can always oscillate at a constant potential difference even when the load is in a transient state, and the stress on the driver circuit can be reduced.

Further, since the predetermined voltage value is one half of the voltage of the DC power supply, even if the load is in a transient state,
The driver circuit can always oscillate between the potential difference of half the power supply voltage, and the stress on the driver circuit can be reduced.

Further, since the driver circuit is connected between the point for dividing the DC power supply and the output point of the switching circuit, even if the load is in a transient state, the driver circuit is always at half the power supply voltage. The driver circuit can be oscillated between the potential differences, so that stress on the driver circuit can be reduced.

Further, since the driver circuit comprises a resonance circuit including an inductor and a capacitor, the driver circuit can be configured with a simple configuration.

A power supply circuit for converting a commercial power supply into DC power,
A switching circuit for converting the output of the power supply circuit to a high frequency, a load circuit connected to an output point of the switching circuit, a driver circuit for driving the switching circuit,
The switching circuit is composed of complementary-connected N-channel FETs and P-channel FETs, and in the load circuit, between an output point of the driver circuit and a ground point terminated from the output point of the switching circuit. Or, it has a coupling capacitor connected between the output point of the power supply circuit, the driver circuit,
A resonance circuit of a capacitor and an inductor is connected between an output point of the switching circuit and the coupling capacitor, and a gate signal of the switching circuit is extracted from the resonance circuit. Even if there is, the driver circuit can always oscillate between the potential difference of half of the power supply voltage, the stress of the driver circuit can be reduced, and the device can be configured with a small number of parts.

Also, a power supply circuit for converting a commercial power supply to DC,
A switching circuit for converting the output of the power supply circuit to a high frequency, a load circuit connected to an output point of the switching circuit, a driver circuit for driving the switching circuit,
The switching circuit is composed of an N-channel FET and a P-channel FET which are complementary connected, and in the load circuit, between a ground point terminated from the output point of the switching circuit and an output point of the power supply circuit. The driver circuit has two coupling capacitors connected in series, and the driver circuit has a resonance circuit of a capacitor and an inductor connected between an output point of the switching circuit and a connection point of the two coupling capacitors. Since the gate signal of the switching circuit is extracted from the resonance circuit, the driver circuit can always oscillate at a potential difference of half of the power supply voltage even when the load such as a lamp is in a transient state, thereby reducing the stress of the driver circuit. The device can be reduced and the device can be configured with a small number of parts.

A power supply circuit for converting a commercial power supply into DC power,
A switching circuit that converts the output of the power supply circuit to a high frequency, a driver circuit that drives the switching circuit, and a load circuit that is connected to an output point of the switching circuit, wherein the switching circuit is complementarily connected. N channel FET and p channel FE
T, the driver circuit is connected to the output point of the switching circuit via a driver power supply capacitor from an output point of a power supply circuit or from a ground point, and comprises a resonance circuit of a capacitor and an inductor. Since the gate signal of the switching circuit is extracted from the circuit,
Even if the load is in a transient state, the driver circuit can always oscillate between the potential difference of half the power supply voltage, so that the stress of the driver circuit can be reduced and the device can be configured with a small number of components.

Also, a power supply circuit for converting a commercial power supply to DC,
A switching circuit for converting an output of the power supply circuit into a high frequency, a driver circuit for driving the switching circuit, and first and second driver power supplies connected in series between an output point of the power supply circuit and a ground point. A capacitor, and a load circuit connected to an output point of the switching circuit, wherein the switching circuit includes N-channel FETs and P-channel FETs connected in a complementary manner. A resonance circuit of a capacitor and an inductor is connected between a point and a connection point of the first and second driver power supply capacitors, and a gate signal of the switching circuit is extracted from the resonance circuit. Driver circuit can always oscillate between half the power supply voltage potential difference , It is possible to reduce stress of the driver circuit can configure devices with a small number of parts.

A rectifier circuit for rectifying a commercial power supply, a smoothing circuit for smoothing the output of the rectifier circuit and converting the output to a direct current, the switching circuit for converting the output of the smoothing circuit to a high frequency, and a driving circuit for the switching circuit And a load circuit connected to an output point of the switching circuit, wherein the switching circuit comprises a complementary-connected N-channel FET and P-channel FE.
T, two smoothing capacitors are connected in series in the smoothing circuit, and a resonance between the capacitor and the inductor is provided between an output point of the switching circuit and a middle point of the two smoothing capacitors in the driver circuit. Since the circuit is connected and the gate signal of the switching circuit is extracted from the resonance circuit, the driver circuit can always oscillate between the potential difference of half the power supply voltage even when the load such as the lamp is in a transient state. In addition, the stress of the driver circuit can be reduced, and the device can be configured with a small number of components.

Further, a voltage doubler rectifier circuit for voltage doubler rectifying a commercial power supply, a switching circuit for converting the output of the voltage doubler rectifier circuit to a high frequency, a driver circuit for driving the switching circuit, and an output point of the switching circuit Wherein the switching circuit comprises an N-channel FET and a P-channel FET which are complementarily connected, and the driver circuit comprises an output point of the switching circuit and the voltage doubler rectifier circuit. Between the middle points of the two smoothing capacitors
Since the resonance circuit of the capacitor and the inductor is connected and the gate signal of the switching circuit is extracted from the resonance voltage of the capacitor and the inductor, the potential difference is always half the power supply voltage even when the load such as a lamp is in a transient state. The driver circuit can be oscillated between them, stress on the driver circuit can be reduced, and the device can be configured with a small number of components.

Also, in the driver circuit, the capacitor of the resonance circuit in which the capacitor and the inductor are connected in series is connected to the output point of the switching circuit, and the gate signal of the switching circuit is extracted from the connection point of the capacitor and the inductor. The driver circuit can be configured with a simple configuration.

In the driver circuit, the capacitor of the resonance circuit in which the capacitor and the inductor are connected in series is connected to the output point of the switching circuit, and the connection point of the capacitor and the inductor is connected to the switching circuit of the switching circuit via a gate resistor. Since the gate signal is extracted, M
The configuration can be such that the input capacitance of the OSFET does not affect the oscillation frequency, and the driver circuit can be configured with a simple configuration.

In the driver circuit, two constant voltage diodes connected in series by connecting anodes or cathodes are connected in parallel to a capacitor constituting the resonance circuit via a gate resistor, and When the output of the circuit is equal to or higher than the rated voltage, the constants of the capacitor or inductor, the gate resistor, or the constant voltage diode constituting the resonance circuit are set so as to have a period during which the two constant voltage diodes are ON. With such a configuration, it is possible to suppress output fluctuations and circuit power consumption fluctuations due to power supply voltage fluctuations. In addition, when the load is a lamp, the ripple of light output is reduced, and the lamp can be turned on without impairing luminous efficiency.

In the discharge lamp lighting device according to the present invention, in the inverter device according to any one of the first to fifteenth aspects, the discharge lamp is connected in the load circuit. It is possible to secure a stable switching operation, suppress a change in power consumption and light output with respect to a change in power supply voltage, and obtain a discharge lamp lighting device with less variation in power consumption and light output even when MOSFET characteristics vary. it can.

Further, since the lighting device according to the present invention incorporates the inverter device or the discharge lamp lighting device according to claims 1 to 16, a stable switching operation can be ensured even in a transient state such as discharge, and the power supply voltage can be secured. It is possible to suppress a change in power consumption and light output with respect to the change in the power supply, and to obtain a lighting fixture with less variation in power consumption and light output even if the characteristics of the MOSFET vary.

[Brief description of the drawings]

FIG. 1 is a block diagram of an inverter device showing Embodiments 1, 2, 6, and 7 of the present invention.

FIG. 2 is a circuit diagram of the inverter device according to the first embodiment of the present invention.

FIG. 3 is an equivalent circuit diagram of a driver circuit of the inverter device according to the first embodiment of the present invention.

FIG. 4 is a waveform chart illustrating an operation of the first embodiment of the present invention.

FIG. 5 is a waveform chart illustrating an operation of the first embodiment of the present invention.

FIG. 6 is a waveform chart illustrating an operation of the first embodiment of the present invention.

FIG. 7 is a waveform chart illustrating an operation of the first embodiment of the present invention.

FIG. 8 is a circuit diagram of an inverter device according to a second embodiment of the present invention.

FIG. 9 is a circuit diagram of an inverter device according to a third embodiment of the present invention.

FIG. 10 is a block diagram of an inverter device showing Embodiments 4 and 5 of the present invention.

FIG. 11 is a circuit diagram of an inverter device according to a fourth embodiment of the present invention.

FIG. 12 is a circuit diagram of an inverter device according to a fifth embodiment of the present invention.

FIG. 13 is a circuit diagram of an inverter device according to a sixth embodiment of the present invention.

FIG. 14 is a circuit diagram of an inverter device according to a seventh embodiment of the present invention.

FIG. 15 is a circuit diagram of an inverter device according to an eighth embodiment of the present invention.

FIG. 16 is a circuit diagram showing a conventional fluorescent lamp lighting device.

FIG. 17 is a block diagram showing a conventional fluorescent lamp lighting device.

FIG. 18 is a waveform diagram illustrating an operation of a conventional fluorescent lamp lighting device.

FIG. 19 is a waveform diagram illustrating the operation of a conventional fluorescent lamp lighting device.

[Explanation of symbols]

1 power supply circuit, 1a diode bridge, 1b, 1
c, 1d smoothing capacitor, 2 switching circuit, 2
a N-channel MOSFET, 2b P-channel MOS
FET, 3 driver circuit, 3a inductor, 3b
Capacitor, 3c Gate resistance, 3d, 3e Constant voltage diode, 4 Load circuit, 4a Ballast coil, 4b
Lamp, 4d coupling capacitor, 5 starter circuit, 5a, 5b resistor, 6 driver power supply, 7 voltage divider circuit, 7a, 7b capacitor, 8 commercial power supply.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K072 AA02 AA05 BA03 BB01 BB09 BC01 CA03 DB03 DC06 DD04 EB01 GA03 GB12 GC02 HA06 5H007 BB03 CA02 CB09 CB17 DB03 DB09

Claims (17)

[Claims] 1. A switching circuit for converting a DC power supply to a high frequency, a load circuit connected to an output point of the switching circuit, and a driver circuit for driving the switching circuit, wherein the switching circuit is complementary. The driver circuit is connected to an output point of the switching circuit independently of the load circuit, and feeds back a voltage generated in the driver circuit. An inverter device for driving a switching circuit. 2. The inverter device according to claim 1, wherein the driver circuit drives the switching circuit at a frequency that increases monotonically with the voltage value when the voltage of the DC power supply is equal to or higher than a rated voltage. 3. The driver circuit is connected between a point having a predetermined voltage value higher than a potential of a ground point and lower than a voltage of a DC power supply, and an output point of the switching circuit. The inverter device according to claim 1 or 2. 4. The inverter device according to claim 3, wherein the predetermined voltage value is one half of a voltage of the DC power supply. 5. The inverter device according to claim 1, wherein the driver circuit is connected between a point at which the DC power is divided and an output point of the switching circuit. 6. The driver circuit according to claim 1, wherein the driver circuit comprises a resonance circuit including an inductor and a capacitor.
The inverter device according to any one of claims 1 to 5, 7. A power supply circuit for converting a commercial power supply into a direct current, a switching circuit for converting an output of the power supply circuit to a high frequency, a load circuit connected to an output point of the switching circuit, and a driver circuit for driving the switching circuit Wherein the switching circuit comprises an N-channel FET and a P-channel FET connected in a complementary manner, and in the load circuit, an output point of the driver circuit and a ground point terminated at the output point of the switching circuit. Or a coupling capacitor connected between the output point of the power supply circuit and the driver circuit, and the resonance between the capacitor and the inductor is provided between the output point of the switching circuit and the coupling capacitor. A circuit is connected, and a gate signal of the switching circuit is extracted from the resonance circuit. An inverter device characterized by the above-mentioned. 8. A power supply circuit for converting a commercial power supply into a direct current, a switching circuit for converting an output of the power supply circuit to a high frequency, a load circuit connected to an output point of the switching circuit, and a driver circuit for driving the switching circuit. Wherein the switching circuit comprises complementary-connected N-channel FETs and P-channel FETs. In the load circuit, a ground point terminated from the output point of the switching circuit and an output point of the power supply circuit. And two driver capacitors connected in series between the output terminal of the switching circuit and a connection point of the two coupling capacitors.
An inverter device, wherein a resonance circuit of a capacitor and an inductor is connected, and a gate signal of the switching circuit is extracted from the resonance circuit. 9. A power supply circuit for converting a commercial power supply into DC, a switching circuit for converting an output of the power supply circuit to a high frequency, a driver circuit for driving the switching circuit, and a load connected to an output point of the switching circuit. The switching circuit is composed of a complementary-connected N-channel FET and a p-channel FET, and the driver circuit is connected to a driver power supply capacitor from an output point of a power supply circuit or from a ground point. An inverter device connected to an output point of the switching circuit, comprising a resonance circuit of a capacitor and an inductor, and extracting a gate signal of the switching circuit from the resonance circuit. 10. A power supply circuit for converting a commercial power supply into a direct current, a switching circuit for converting an output of the power supply circuit to a high frequency, a driver circuit for driving the switching circuit, and an output point and a ground point of the power supply circuit. And a load circuit connected to an output point of the switching circuit. The switching circuit comprises a complementary-connected N-channel FET and P A channel FET, wherein a resonance circuit of a capacitor and an inductor is connected between an output point of the switching circuit and a connection point of the first and second driver power supply capacitors in the driver circuit; An inverter device for extracting a gate signal of the switching circuit from the inverter. 11. A rectifier circuit for rectifying a commercial power supply, a smoothing circuit for smoothing the output of the rectifier circuit and converting the output to a direct current, the switching circuit for converting the output of the smoothing circuit to a high frequency, and driving the switching circuit. And a load circuit connected to an output point of the switching circuit, wherein the switching circuit comprises an N-channel FET and a P-channel FET connected in a complementary manner. And a resonance circuit of a capacitor and an inductor is connected between an output point of the switching circuit and a middle point of the two smoothing capacitors in the driver circuit. An inverter device for extracting a gate signal of the inverter. 12. A voltage doubler rectifier for rectifying voltage of a commercial power supply, a switching circuit for converting an output of the voltage rectifier to a high frequency, a driver circuit for driving the switching circuit, and an output point of the switching circuit. And a load circuit connected to the switching circuit. The switching circuit is composed of an N-channel FET and a P-channel FET connected in a complementary manner. In the driver circuit, an output point of the switching circuit and the voltage doubler rectifier circuit are configured. An inverter device, wherein a resonance circuit of a capacitor and an inductor is connected between a middle point of the two smoothing capacitors and a gate signal of the switching circuit is extracted from a resonance voltage of the capacitor and the inductor. 13. A driver circuit, wherein the capacitor of a resonance circuit in which a capacitor and an inductor are connected in series is connected to an output point of a switching circuit, and a gate signal of the switching circuit is extracted from a connection point of the capacitor and the inductor. 2. The method according to claim 1, wherein
2. The inverter device according to 2. 14. In a driver circuit, the capacitor of a resonance circuit in which a capacitor and an inductor are connected in series is connected to an output point of a switching circuit, and a connection point of the capacitor and the inductor is connected to the switching circuit of the switching circuit via a gate resistor. 13. The inverter device according to claim 1, wherein a gate signal is extracted. 15. In the driver circuit, two constant voltage diodes connected in series by connecting anodes or cathodes are connected in parallel to a capacitor constituting the resonance circuit via a gate resistor, and When the output of the circuit is equal to or higher than the rated voltage, a constant of a capacitor or an inductor, a gate resistor, or a constant voltage diode constituting the resonance circuit is set so as to have a period in which the two constant voltage diodes are turned on. The inverter device according to claim 14, wherein 16. The discharge lamp lighting device according to claim 1, wherein a discharge lamp is connected to the load circuit. 17. A lighting device comprising the inverter device or the discharge lamp lighting device according to claim 1 incorporated therein.