JPH05153783A - Printed board structure for inverter - Google Patents

Abstract

PURPOSE:To reduce influence of mutual interference of a plurality of inverters as much as possible. CONSTITUTION:Control circuits of a plurality of inverters are integrally formed as a control circuit section F. Main circuit sections K1, K2, the section F and a power supply section G are mounted one printed board 6 in a block manner. Power supply patterns e1, e2 or ground patterns g1, g2 are so formed as to from isolation among the sections K1, K2, the sections F, and G.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board structure for mounting a plurality of inverter devices on one printed circuit board.

[0002]

2. Description of the Related Art FIG. 4 shows an inverter device used as a discharge lamp lighting device. In this inverter device, switching elements Q ₁ and Q ₂ are connected in series at both ends of a DC power source E ₁ , and a switching element Q composed of one transistor is connected.
_A load circuit 1 including a drive transformer T ₁ , a capacitor C ₁₀ and a discharge lamp La is connected to both ends of 1. here,
Resonant circuit with the primary winding L ₁ and the capacitor C ₁₀ of the driving transformer T ₁ is configured.

In this inverter device, the switching element Q ₂ composed of the other FET is turned on and off by using the control circuit 2, and when the switching element Q ₂ is turned on, the switching element Q ₂ is stored in the primary winding L ₁ of the drive transformer T _1. The switching element Q ₁ is turned on and off by the so-called self-excited type with the generated energy, so that the switching elements Q ₁ and Q ₂ are turned on and off alternately to supply a high frequency current to the discharge lamp La. That is, this inverter device is of a so-called self-excited other control system. The detailed operation will be described later.

FIG. 5 shows a specific configuration of this inverter device. The control circuit 2 in FIG. 5 detects the operating state of the inverter circuit section by the resistors R ₆ and R ₇ connected to both ends of the switching element Q ₂ . That is, the resistance R ₆ ,
R ₇ constitutes the detection unit 2c in FIG. Then, a monostable multivibrator (eg NEC μP
D4538) 3 and transistors Q ₄ and Q ₅
The timer 2a and the trigger unit 2b in FIG.
The control circuit 2 is supplied with power from the control power supply E ₂ .

The control circuit 2 includes a switching element Q ₂
When the voltage across both ends of the voltage drops below a predetermined voltage, the monostable multivibrator 3 is triggered. At this time, the transistor Q ₄ is turned on and the transistor Q ₅ is turned off, as shown in FIG. Switching element Q
Apply gate voltage to ₂ . 6 (e) and 6 (f)
Outputs Q and R of the monostable multivibrator 3 are shown in FIG.

This state is maintained for a time determined by the time constants of the resistor R ₉ and the capacitor C ₄ externally attached to the monostable multivibrator 3. After the lapse of the above time, the transistor Q ₄ is turned off, the transistor Q ₅ is turned on, and the application of the gate voltage to the switching element Q ₂ is stopped. That is, the operating state of the inverter circuit section is detected from the voltage across the switching element Q ₂ , and the detection output is used as a trigger to apply the gate voltage to the switching element Q ₂ for a certain period.

The switching element Q₂The gate of
・ Because there is a junction capacitance between the sources, Fig. 6 (g)
Switching element Q₂Is forward biased
When it is turned on, the large peak shown in (h) of the figure
Pulsed current I _GFlows. By the way
In the case of the self-excited other type inverter device of
DC power supply E when switch SW is closed₁When was supplied
Then, the inverter device is not oscillating and the switch
Element Q₂Since the voltage across both ends of the
By the control circuit 2 described above, the switching element Q₂To the game
The operation of applying the voltage does not work. So the inverter
The starting circuit 4 is required to start the oscillation operation of the device.
is there. This start-up circuit 4 is a 2-terminal thyristor such as a diac.
Star Q₃, Diode D₃, Capacitor C₂And resistance R
_FiveIt is composed of.

In the starting circuit 4, the power switch SW is closed.
DC power source E₁Is supplied, the resistance R_FiveThrough
Condenser C₂Is charged, this capacitor C₂Both
Terminal voltage is 2-terminal thyristor Q₃Reached the breakover voltage of
Then, the 2-terminal thyristor Q ₃Is turned on and the switch
Element Q₂The gate voltage is applied to. This allows you to
Switching element Q when power is turned on₂Turns on and the resistance R
₆, R₇Causes the detection voltage to drop below the specified voltage.
When the control circuit 2 is switching element Q₂On / off system
Control causes the inverter device to continue oscillating.
To do.

In this way, the inverter device is activated.
After starting the operation, the inverter device
Will continue to oscillate, so the starter circuit 4 switches
Element Q₂It is not necessary to apply a gate voltage to. this
Therefore, the starting circuit 4 has a diode D₃Is installed
Touching element Q₂When the diode turns on, the diode D ₃
Through the capacitor C₂By discharging the charge of
The startup circuit 4 does not work after the inverter device has started.
I have it.

Hereinafter, the operation of the main circuit portion of the inverter device will be described.
Explain the work. In the following explanation, the load circuit 1 is inductive.
The case will be described. Now by the control circuit 2
Switching element Q₂If is turned on, this
When DC power supply E₁→ Capacitor C₀→ load circuit 1 → switch
Touching element Q₂The current flows through the path. At this time
Touching element Q₂The current I shown in FIG. _Q2Flows
It At this time, the drive transformer T₁Secondary winding L₂To
Is the switching element Q shown in FIG.₁Reverse via
Voltage is applied, and as shown in Fig. 2 (b).
Sea urchin switching element Q₂Switch on while is on
Element Q₁Is kept off. Note that FIG. 6 (b)
Is a switching element Q₁Collector-emitter voltage
V_Q1The switching element Q is shown in FIG.₂The de
Rain-source voltage V_Q2Indicates.

After that, the gate voltage from the control circuit 2 is printed.
Is stopped, and the switching element Q₂Turns off
And the drive transformer T₁Primary winding L₁Energy accumulated in
Switching element Q by Rugi₂Same direction as when
A back electromotive force that continues to flow in the
Su T₁Primary winding L₁→ Diode D₁→ Capacitor C
₀→ Current flows through the load circuit 1. At this time
Iodo D₁The current I shown in FIG._D1Flows.
At this time, the drive transformer T₁Secondary winding L₂On
Due to the counter electromotive force, the switching element Q shown in FIG.
₁A voltage that forward biases is induced.

The drive transistor T₁Primary winding
L₁The energy stored in the
₁When the current flowing through the
Child Q ₁Turns on. In this case, due to the above-mentioned current
Capacitor C₀The charge stored in the
Sensor C₀→ Switching element Q₁→ Route of load circuit 1
Then, a current in the opposite direction to that before flows through the load circuit 1.
At this time, the switching element Q₁Drive transformer T
₁Secondary winding L₂Positive feedback is applied by the voltage induced in
And the switching element Q₁The on state of is deep
Collector current I _Q1Rapidly increases and the base current h
A saturation state of fe times is reached.

After that, the capacitor C₀Charge is discharged
As it is charged, the transistor Q ₁Applied to the base of
Drive transformer T₁Secondary winding L₂Induced voltage
Decrease, and finally the switching element Q₁To turn on
Can no longer hold the switching element Q₁Is off
It Switching element Q at this time₁By turning off
Dynamic transformer T₁Primary winding L₁With the energy stored in
A back electromotive force that maintains the current flowing through the load circuit 1 is generated.
The drive transformer T₁Primary winding L₁→ load
Circuit 1 → capacitor C₀→ DC power supply E₁→ Diode D
₂The current flows through the path. At this time, the diode D₂In
Current I shown in FIG._D2Flows.

In this way, the diode D₂Is on
The switching element Q ₂The voltage across
The voltage drops below the voltage, which causes the control circuit 2 to operate and
Itching element Q₂As shown in Fig. 6 (g),
Pressure is applied. However, at this time, the diode D₂But
Since it is on, switching element Q₂Turned off
There is.

The energy accumulated in the primary winding L ₁ of the drive transformer T ₁ is consumed and the diode D
_When the current flowing through ₂ becomes zero, the switching element Q ₂ is turned on at that point, and the DC power supply E ₁ → capacitor C
_A current flows through the path of ₀ → load circuit 1 → switching element Q ₂ . Hereinafter, by repeating the above-described operation, the inverter device continues the oscillating operation.

By the way, in the case of the above-mentioned inverter device, one discharge lamp La is turned on. However, as shown in FIG. 7, a plurality of discharge lamps are used by using a plurality of inverter devices having the above-mentioned configuration. Some lights up. Here, these inverter devices operate by being supplied with power from the same DC power supply E ₁ . In order to downsize the device and reduce the cost, it has been attempted to integrally integrate the control circuits 2 ₁ and 2 ₂ of the respective inverter devices and further mount the respective inverter devices on the same printed circuit board. ing.

However, since the respective inverter devices individually detect the voltage across the switching elements Q ₂₁ and Q ₂₂ and oscillate, that is, they operate independently of each other,
Even if the respective inverter devices K ₁ and K ₂ have the same oscillation frequency, they do not oscillate at the same timing. In addition, when the loads are different, the oscillation frequency of each inverter device may be intentionally changed to operate.

In such a case, if the respective inverter devices are mounted on the same printed circuit board as described above, there is a problem that normal operation cannot be performed due to mutual interference between the respective inverter devices. For example, since the respective inverter devices are mounted on the same printed circuit board, for example, between X _{11 and} B _{1 of} one inverter device, between the gates of Y _{11 and} Q ₂₁ , and the other inverter device shown in FIG. The wiring patterns between X _{12 and} B _{2 and} between the gates of Y _{12 and} Q ₂₂ are formed close to each other, so that electrostatic induction or magnetic coupling between the wiring patterns causes switching of one inverter device. signal for turning on the element Q ₂ is, happen to be superimposed on the wiring pattern for turning on the switching element Q ₂ of the other inverter. In this case, as shown in FIG. 8B, the voltage waveform of the gate-source voltage V _GS of the switching element Q ₂ is greatly disturbed, the inverter device abnormally oscillates, and the discharge lamp La flickers. When this abnormal state is severe, the inverter device K may stop oscillating.

Therefore, in order to improve this point, as shown in FIG. 9, an IC in which control circuits 2 ₁ and 2 ₂ are integrally integrated.
5, for example dual inline package (DIP)
Forming a mold or package shape corresponding thereto, and an output terminal for applying an input terminal and the gate voltage of the switching element Q _21, Q ₂₂ of the voltage across the switching element Q _21, Q ₂₂ of each of the inverter device, the switching element Q
₂₁ and Q ₂₂ are separately provided in the terminal rows arranged on both sides, and the main circuit portions K ₁ and K ₂ except the control circuit 2 of each inverter device are provided on the side where the corresponding input / output terminals are provided. There are some that are implemented.

In FIG. 9, the control of the inverter device is
K for main circuit except control circuit 2₁, K ₂Is indicated by
Control circuit 2₁, 2₂The control circuit consisting of
Power supply circuit that rectifies and smoothes AC power to create DC power
Parts are indicated by G. In this way, the inverter
Oki K₁X₁₁-B₁Meanwhile, Y₁₁-Q_{twenty one}Between the gates of the
Barter device K₂X₁₂-B₂Meanwhile, Y₁₂-Q_{twenty two}Between the gates
The wiring pattern of and is close to or intersects
And each inverter device
Interference can be reduced.

[0021]

However, there are cases where mutual interference of the inverter devices cannot be prevented even by the above method. For example, when there are restrictions on the shape or dimensions of the printed circuit board as shown in FIGS. 10A and 10B due to restrictions due to the outer shape of the lighting device and the shape of the load such as the discharge lamp, description will be given with reference to FIG. As described above, it may not be possible to arrange each circuit unit in an ideal state. Figure 1
0 (a) shows the case where the printed circuit board 6 has to be formed in an elongated rectangle, and FIG. 0 (b) shows the case where it has to be formed in an arc shape.

In such a case, for example, an inverter
Device Y₁₁-Q_{twenty one}Between gates and Y ₁₂-Q_{twenty two}Between the gates
Pattern to connect (a in the figure₁, A₂, And X₁₁
-B ₁Between and X₁₂-B₂The pattern for connecting between (b in the figure
₁, B₂(Indicated by) and
Therefore, the abnormal oscillation and the like due to the mutual interference described above occur.

The present invention has been made in view of the above points, and an object thereof is to provide a printed circuit board structure of an inverter device which can minimize the influence of mutual interference of a plurality of inverter devices. To do.

[0024]

According to the present invention, in order to achieve the above object, a main circuit portion excluding control circuits of a plurality of inverter devices and a control circuit for independently controlling these main circuit portions are integrated. The control circuit section formed in the above and the power supply circuit section for supplying power to each circuit section are mounted on one printed board in a block manner, and a power supply pattern or a ground pattern is provided so as to separate the respective circuit sections. Has been formed.

When the control circuit section detects the operating state of the load connected to each inverter device to control the operation of the inverter device, the load state detecting pattern may be a power source pattern or a ground pattern. It is preferable to be separated from the circuit section.

[0026]

The present invention has the above-mentioned configuration,
By separating each circuit part in a pattern with stable potential and low impedance, it is possible to reduce electrostatic induction or magnetic coupling between the circuit parts and to minimize the effect of mutual interference of multiple inverter devices. It was made possible.

[0027]

FIG. 1 shows an embodiment of the present invention. In this example
Are two invars on a long and narrow rectangular printed circuit board 6.
Shows the case where the circuits that make up the
K ₁, K₂, The control circuit F and the power supply circuit section G are respectively
Are placed on the printed circuit board 6 like a
K₁, K₂, F is the main circuit section K₁, K₂The grand
Line pattern g₁, G₂Forming each circuit part
K₁, K₂, F are electrically and magnetically separated from each other.
That is, each circuit part K₁, K₂, F potential is stable and
By providing a ground line with low speed,
Each circuit part K₁, K₂Between F and F
The phase of multiple inverter devices can be reduced by reducing air coupling.
The influence of mutual interference is minimized. Na
Oh, load La₁, La₂Is one end side of the printed circuit board 6, respectively
Since it is designed to be connected to,
Main circuit section K₁, K₂Pattern forming the output line of
₁, O₂Is formed on one end side.

By the way, in the case of electrically and magnetically separating the respective circuit parts K ₁ , K ₂ and F by the ground line as described above, it is expected that a good effect is obtained by simply wiring the ground line. Is difficult In other words, if the ground line also pays attention to the current, the potential of the ground line cannot be said to be stable at any place, because it fluctuates relatively large. Therefore, even if they are separated by a ground line at a place where the potential is unstable, the effect of reducing electrostatic induction or magnetic coupling is not expected.

Therefore, in the case of the present embodiment, one point (for example, the negative electrode side of the smoothing capacitor) P ₁ of the power supply circuit section G where the potential is relatively stable is connected to the main circuit sections K ₁ and K ₂ . The ground lines are connected to stabilize the potentials of the patterns g ₁ and g ₂ . If there is another point at which the potential is stable, for example, one that is grounded with respect to the ground, it may be connected to that point.

By the way, since the power supply line of the power supply circuit section G has a relatively stable potential and a low impedance, the patterns e ₁ and e ₂ forming this power supply line are used.
It is also possible to electrically and magnetically separate the respective circuit parts K ₁ , K ₂ and F. Also at this time, the power supply lines of the main circuit units K ₁ and K ₂ may be connected to one point (for example, the positive electrode side of the smoothing capacitor) P ₂ of the power supply circuit unit G where the potential is relatively stable. preferable.

In the case of this embodiment, the power supply circuit section G
The DC voltage supplied from the resistor is divided by resistors r ₁ and r ₂ to be supplied to the control circuit section F through a pattern d ₁ forming a control power supply line, and the ground line of the control circuit section F is The pattern g _{3 to} be formed is also connected to the point P _{1 of the} power circuit section G. By the way, in the case where each of the control circuits 2 ₁ and 2 ₂ forming the control circuit unit F has a function of detecting the operating state of the load and stopping the oscillation at the time of abnormality or varying the operating state of the load There is. The operating state of the load at this time (for example, the Emiles state at the end of life when the load is a discharge lamp, the lighting state of the discharge lamp, or the no-load state when the load is removed) is
Generally, it is detected by a voltage change or current change of the outputs of the main circuit units K ₁ and K ₂ . Then, the main circuit parts K ₁ , K ₂
And the control circuit section F are connected by patterns c ₁ and c ₂ forming a load operation detection line.

[0032] In the case where this manner include the pattern c _1, c _2, and approaches the pattern c _1, c ₂ is the inverter device (including the inverter device itself is connected), electrostatic induction or magnetic mentioned above There is a problem that the control circuit unit F malfunctions due to the superposition of signals due to static coupling. For example, when the patterns c ₁ and c ₂ are used for detecting an abnormality such as an emily state,
There is a possibility that the control circuit unit F malfunctions, causing malfunction such as stopping the oscillation of the inverter device.

Therefore, in this embodiment, the patterns c ₁ ,
c ₂ is the pattern g ₁ , g ₂ forming the ground line
I am passing between By doing so, it is possible to prevent unnecessary signals from being superimposed on the load state detection line. By the way, as a further unfavorable state, for example, the load L
When a ₁ and La ₂ are connected to one end side of the printed circuit board 6, the output lines of the inverter device (o ₁ , o in the figure)
₍ Indicated by ₂ ) passes near the other inverter device,
Alternatively, as shown in FIG. 10B, patterns a ₁ , a
_It may pass near ₂ , b ₁ and b ₂ . Even in such a case, the above-mentioned problem of abnormal oscillation or oscillation stop occurs due to electrostatic induction or magnetic coupling between the respective wiring patterns, and in this case, since the output energy of the inverter device is large, The above phenomenon becomes remarkable.

Therefore, in order to prevent this, the patterns o ₁ and o forming the output lines of the main circuit portions K ₁ and K ₂ are formed.
_It is necessary to mount 2 so that it is as close to the other inverter device as possible. Further, as shown in FIG. 10B, when the pattern d _{1 which} is the control power supply line of the control circuit unit F is close to the main circuit units K ₁ and K ₂ of the inverter device, control is performed by electrostatic induction or magnetic coupling. The ripple component of the power supply becomes large, which may cause the IC 5 to malfunction. Therefore, it is preferable to form the pattern d _{1 serving} as the control power supply line so as to be separated from the main circuit portions K ₁ and K ₂ of the inverter device.

FIG. 2 shows the present invention as in the case of FIG.
When applied to the case where the printed circuit board 6 has a substantially arc shape,
In this case, large parts are shown. In the figure
FU is a fuse, LF is a line filter, DI₁, DI
₂Is a rectifier diode for commercial power, CN₁, CN₂Is smooth
Capacitor, r₁Is the drop resistance for the control circuit, T
O ₁, TO₂Is a connecting portion for connecting a load.

In the above, the case where two inverter devices are provided on one printed circuit board has been described, but the present invention can be applied to a case where three or more inverter devices are provided by the same method. For example, FIG. 3 shows a case where three inverter devices are provided on one printed circuit board 6. Also in this case, there is basically no difference from the configuration described in FIG.
The pattern c ₃ forming the load state detection line of the main circuit portion K ₃ of the third inverter device extends through the outermost part of the printed circuit board 6, and the pattern g forming the ground line of the main circuit portion K ₃ inside the pattern c _{3. 4} is provided. The electrical and magnetic separation from the main circuit portions K ₂ and K ₃ is performed by the patterns e ₂ and e ₃ forming the power supply line. Here, since the patterns e ₂ and e ₃ which are the power supply lines have the same potential, they may be integrated, but it is preferable to form them separately when a noise component is taken into consideration. Moreover, since the patterns e ₂ and e ₃ have the same potential as described above, problems such as insulation distance may be caused rather than separating the main circuit portions K ₂ and K ₃ from the pattern e ₂ and the pattern g ₄ forming the ground line. And the wiring efficiency is improved.

[0037]

As described above, the present invention has a main circuit section excluding the control circuits of a plurality of inverter devices, and a control circuit section integrally formed with a control circuit for independently controlling these main circuit sections, A power supply circuit section for supplying power to the respective circuit sections is mounted on one printed board in a block manner, and a power supply pattern or a ground pattern is formed so as to separate the respective circuit sections from each other. By separating the circuit parts in a stable and low-impedance pattern, electrostatic induction or magnetic coupling between the circuit parts can be reduced, and the influence of mutual interference between the plurality of inverter devices can be minimized.

In the case where the control circuit section detects the operating state of the load connected to each inverter device to control the operation of the inverter device, the load state detecting pattern may be a power source pattern or a ground pattern. Separation from the circuit section can reduce electrostatic induction or magnetic coupling from each circuit section to the load state detection pattern, and thus prevent the inverter device from malfunctioning.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a method for forming a wiring pattern according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a method for forming a wiring pattern according to another embodiment.

FIG. 3 is an explanatory diagram showing a method for forming a wiring pattern according to still another embodiment.

FIG. 4 is a circuit diagram showing a schematic configuration of an inverter device to which the above is applied.

FIG. 5 is a specific circuit diagram of the above inverter device.

FIG. 6 is an operation explanatory diagram of the above.

FIG. 7 is a circuit diagram in the case of including a plurality of inverter devices.

FIG. 8 is an explanatory diagram of the above problem.

FIG. 9 is an explanatory diagram of a conventional method for preventing adverse effects due to mutual interference between inverter devices.

10 (a) and 10 (b) are explanatory views of the problems described above.

[Explanation of symbols]

K _1, K ₂ main circuit unit F control circuit unit G power supply circuit _{a 1 ~a 3, b 1 ~b} 3, c 1 ~c 3, g 1 ~g 4 pattern 6 printed circuit board

Claims (2)

[Claims] 1. A main circuit unit excluding control circuits of a plurality of inverter devices, a control circuit unit integrally formed with a control circuit for independently controlling the main circuit units, and power supply to each of the circuit units. A printed circuit board structure of an inverter device, characterized in that a power supply circuit unit and a power supply circuit unit are mounted on one printed circuit board in a block manner, and a power supply pattern or a ground pattern is formed so as to separate the respective circuit units. 2. When the control circuit section detects the operating state of a load connected to each inverter device to control the operation of the inverter device, the load state detecting pattern may be a power supply pattern or a ground pattern. A printed circuit board structure for an inverter device, characterized in that the printed circuit board structure is separated from the circuit part.