JP2001016871A - Power supply equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply equipment which can be easily reduced in size by suppressing the interference between power lines and load lines. SOLUTION: Wiring patterns 6a connected by power lines and shorter wiring patterns 7a connected by load lines 7 are formed on opposite faces of a printed wiring board 5. Since these two types of wiring patterns are distributed to the front and the rear face of the double-sided printed wiring board, interference between these wiring patterns can be suppressed, preventing interference between the power lines and the load lines. Due to this structure, the connections between the power lines and the corresponding wiring patterns and those between the load lines and the corresponding wiring patterns can be disposed close to each other, thus facilicating reduction in size of power supply equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, and more particularly to a power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying it to a lighting load.

[0002]

2. Description of the Related Art As shown in FIG. 4, a conventional power supply device for converting an AC voltage of a commercial power supply to a high-frequency voltage has a printed wiring on which circuit components for converting the AC voltage of the commercial power supply to a high-frequency voltage are mounted. A power supply unit 8 for inputting an AC voltage supplied from a commercial power supply; a power supply line 6 connecting the power supply unit 8 and a connection point 5 a on the printed wiring board 5; A load line 7 for connecting the connection point 5b, the printed wiring board 5, a power supply unit 8, and a power line 6
And a housing 1a for accommodating a part of the load line 7. Further, a supporting housing 4 protruding from the lower surface of the housing 1a.
Is provided with a lamp socket (not shown) and a shank 3 at the end thereof, and an incandescent lamp (not shown) whose high-frequency output is an illumination load through a load wire 7 inserted into the support housing 4 and connected to the lamp socket. ).

[0003] The conventional power supply 1 constructed as described above
As shown in FIG. 5, by connecting a power supply unit 8 to a wiring duct 2 disposed on a ceiling or the like, electrical connection is made, and at the same time, the housing 1a is mechanically connected to the wiring duct 2. Supported.

[0004]

However, in the above-mentioned conventional configuration, the wiring pattern formed on the printed wiring board 5 and connected to the load line 7 via the connection point 5b is:
Since a high-frequency current flows, noise is apt to occur, and interferes with a wiring pattern formed on the printed wiring board 5 and connected to the power supply line 6 via the connection point 5a. In order to avoid such interference, For example, the connection points 5a and 5b need to be arranged at both ends of the printed wiring board 5 at a distance from each other, which is an obstacle to downsizing the power supply device 1.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a power supply device in which interference between a power supply line and a load line is suppressed to facilitate downsizing.

[0006]

According to the first aspect of the present invention, there is provided a power supply apparatus for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying the high-frequency voltage to a lighting load. A power supply device includes a power supply line to be connected, a printed wiring board on which a circuit component for converting an AC voltage supplied through the power supply line to a high-frequency voltage is mounted, and a load line for supplying a high-frequency voltage to a lighting load. And a wiring pattern to which a power supply line is connected and a wiring pattern to which a load line is connected are formed on different surfaces of the printed wiring board. Because it was distributed to
Mutual interference can be suppressed, and as a result, the connection point between the power supply line and the wiring pattern and the connection point between the load line and the wiring pattern can be arranged close to each other, which facilitates miniaturization of the power supply device. be able to.

According to a second aspect of the present invention, there is provided a power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying it to a lighting load, wherein the power supply line is connected to the commercial power supply, and the AC voltage supplied through the power supply line. Wiring pattern on a printed wiring board connected to a load line in a power supply device including a printed wiring board on which a circuit component for converting the power to a high frequency voltage is mounted, and a load line for supplying a high frequency voltage to a lighting load. The effect of noise is reduced by shortening the wiring pattern where noise is likely to occur.
Thereby, interference with the wiring pattern on the printed wiring board connected to the power supply line can be suppressed. As a result, the connection point between the power supply line and the wiring pattern and the connection point between the load line and the wiring pattern can be arranged close to each other, and the power supply device can be easily reduced in size.

According to a third aspect of the present invention, there is provided a power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying it to a lighting load, wherein the power supply line is connected to the commercial power supply, and the AC voltage supplied through the power supply line. In a power supply device including a printed wiring board on which a circuit component for converting the power to a high-frequency voltage is mounted, and a load line for supplying a high-frequency voltage to a lighting load, a wiring pattern to which the power line is connected, and a load line The wiring patterns to be connected are formed on the printed wiring board so as to be substantially parallel to each other for a predetermined length, and currents having opposite phases flow therethrough, and currents having phases opposite to each other flow through these wiring patterns. Therefore, noise generated in one wiring pattern is canceled by noise of the opposite polarity induced in the other wiring pattern, and interference can be suppressed. As a result, the connection point between the power supply line and the wiring pattern and the connection point between the load line and the wiring pattern can be arranged close to each other, and the power supply device can be easily reduced in size.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) The basic configuration in this embodiment is common to that of the conventional example. Only parts will be described in detail.

The power supply device according to the present embodiment is configured as shown in FIG. In this power supply device 1, a commercial AC power supply 11 is connected to a rectifier D composed of a diode bridge through a filter circuit composed of a capacitor C1 and an inductor 10.
A pulsating current input to B1 and obtained by full-wave rectification by the rectifier DB1 is converted to a high frequency by a self-excited half-bridge type inverter circuit. A series circuit of resistors R3, R4 and a capacitor C4 is connected between the output terminals of the rectifier DB1, and when the AC power supply 11 is turned on, the capacitor C4 is charged via the resistors R3, R4. Also, a pair of capacitors C2 and C3 connected in series and inserted between the output terminals of the rectifier DB1 are charged. When the voltage across the capacitor C4 reaches the breakover voltage (for example, about 8 V) of the trigger element Q3 made of SBS, the trigger element Q3 turns on and the transistor Q
2, the base current flows to turn on.

When the transistor Q2 turns on, the primary winding n of the step-down transformer 9 and the primary winding n of the current transformer CT1
1. The charge of the capacitor C2 is discharged through the transistor Q2, and a collector current flows through the transistor Q2.
When a current flows through the primary winding n1 of the current transformer CT1, further current flows through the base of the transistor Q2, so that the collector current of the transistor Q2 increases and quickly shifts to a saturation region. Some time after the collector current of the transistor Q2 becomes constant, the secondary winding n of the current transformer CT1
3 is reduced, the transistor Q2
, The base current decreases, and the region shifts from the saturation region to the active region. Then, since the collector current of the transistor Q2 decreases, the current of the secondary winding n3 of the current transformer CT1 further flows in a direction to turn off the transistor Q2. Therefore, the transistor Q2 rapidly shifts to the off state, and conversely, the base current of the transistor Q1 flows in the direction of turning on the transistor Q1, and the transistor Q1 rapidly turns on and shifts to the saturation state.

At this time, since the current flowing through the primary winding of the step-down transformer 9 cannot be rapidly reversed due to the self-inductance of the step-down transformer 9, a regenerative current IF1 flows through the circuit. This regenerative current IF1 is calculated by the primary winding of the step-down transformer 9 → the primary winding n of the current transformer CT1.
1 → secondary winding n2 of current transformer CT1 → resistor R1 → between base and collector of transistor Q1 → capacitor C2
Flows along the path. Then, the current flowing in one secondary winding n2 of the current transformer CT1 induces a current in the other secondary winding n3 to turn on the transistor Q2.
A resistor R2 and a capacitor C connected to the secondary winding n3
The current induced in the secondary winding n3 by the filter circuit constituted by 5 is absorbed to prevent the transistor Q2 from turning on. The time constant of the filter circuit is such that the current induced by the regenerative current IF1 is
2 is set to a value that cannot be turned on.

Next, shortly after the collector current of the transistor Q1 becomes constant, the current transformer CT1
, The current induced in the secondary winding n2 of the transistor Q1 decreases, and the base current of the transistor Q1 decreases to shift from the saturation region to the active region. Then, since the collector current of the transistor Q1 decreases, the secondary winding n2 of the current transformer CT1
Further flows in a direction to turn off the transistor Q1. Therefore, the transistor Q1 rapidly shifts to the off state, and conversely, the base current of the transistor Q2 flows in the direction of turning on the transistor Q2, and the transistor Q2 rapidly turns on and shifts to the saturation state.

At this time, the regenerative current IF2 is supplied from the primary winding of the step-down transformer 9, the capacitor C3, and the current transformer CT.
1, the current flows through the path of the secondary winding n3 → the resistor R2 → the base-collector of the transistor Q2 → the primary winding n1 of the current transformer CT1. Here, one of the two current transformers CT1
The current flowing in the secondary winding n3 induces a current in the other secondary winding n2 to turn on the transistor Q1.
A resistor R1 and a capacitor C6 connected to the next winding n2
Absorbs the current induced in the secondary winding n2 by the filter circuit formed by the filter circuit and prevents the transistor Q1 from turning on. The time constant of the filter circuit is such that the current induced by the regenerative current IF2 is the transistor Q1.
Is set to a value that cannot be turned on.

Thereafter, the same phenomenon is repeated, and the transistors Q1 and Q2 are alternately turned on and off. ")
Oscillation stops because there is no power supply for maintaining When the pulsating current output exceeds about 0 V, the voltage gradually increases, so that the capacitor C4 is again passed through the resistors R3 and R4.
When the breakover voltage of the trigger element Q3 is reached, the trigger element Q3 is turned on and the transistor Q3 is turned on.
2 is turned on by the base current flowing, and oscillation starts.
Then, a voltage corresponding to the turns ratio of the step-down transformer 9 is applied to the incandescent lamp 12 connected to the secondary winding of the step-down transformer 9, and the incandescent lamp 12 is turned on.

By adopting the circuit configuration as described above,
There is no need for a diode connected in parallel to the transistors Q1 and Q2 to flow the generally used regenerative currents IF1 and IF2, and there is an advantage that cost and size can be reduced.

Next, the gist of the present invention will be described. The power supply device according to the present embodiment can be realized by mounting the circuit components constituting the power supply device 1 on a printed wiring board and adopting the device configuration described below.

The printed wiring board 5 is a double-sided board. As shown in FIG. 1A, a wiring pattern 6a connected to the power supply line 6 via the connection point 5a is formed on the component mounting surface of the printed wiring board 5. Then, as shown in FIG. 1B, a wiring pattern 7a connected to the load line 7 via the connection point 5b is formed on the solder surface. That is, since the wiring pattern 6a and the wiring pattern 7a are formed separately on the component mounting surface and the solder surface of the printed wiring board 5, mutual interference can be suppressed.

Further, a step-down transformer 9 connected to the connection point 5b by the wiring pattern 7a is arranged near the connection point 5b to shorten the wiring pattern 7a. Although a high frequency current flows through the wiring pattern 7a, noise is likely to be generated. However, by reducing the length of the wiring pattern, noise can be hardly generated.

Further, the wiring pattern 6a and the wiring pattern 7a are arranged substantially parallel to each other by a predetermined length so that currents of opposite phases flow. For example, by adjusting the winding of the step-down transformer 9 and the winding of the inductor 10 for the filter shown in FIG. 3, it is possible to cause currents of opposite phases to flow through the wiring pattern 6a and the wiring pattern 7a. As a result, noise generated in one wiring pattern is canceled by noise of the opposite polarity induced in the other wiring pattern. Therefore, by setting the lengths of the wiring pattern 6a and the wiring pattern 7a, which are substantially parallel to each other, to appropriate values, interference with each other can be suppressed.

With the above configuration, the wiring patterns 6a, 7a
As a result, as shown in FIG. 2, the connection points 5 a and 5 b can be arranged at, for example, one end of the printed wiring board 5 near the power supply unit 8. Can be facilitated. In addition, by reducing the size of the power supply device 1, it is possible to make it harder to receive heat radiation from an incandescent lamp which is an illumination load.

[0022]

According to the first aspect of the present invention, there is provided a power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying it to a lighting load, wherein power is supplied through a power supply line connected to the commercial power supply and the power supply line. In a power supply device including a printed wiring board on which circuit components for converting an AC voltage to a high-frequency voltage are mounted, and a load line that supplies a high-frequency voltage to a lighting load,
Since the wiring patterns to which the power supply lines are connected and the wiring patterns to which the load lines are connected are formed on different surfaces of the printed wiring board, each wiring pattern is distributed to the front and back surfaces of the printed wiring board which is a double-sided board. As a result, mutual interference can be suppressed, and as a result, the connection point between the power supply line and the wiring pattern and the connection point between the load line and the wiring pattern can be arranged close to each other, and the size of the power supply device can be reduced. There is an effect that it can be facilitated.

According to a second aspect of the present invention, there is provided a power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying the high-frequency voltage to a lighting load, comprising: a power supply line connected to the commercial power supply; Wiring pattern on a printed wiring board connected to a load line in a power supply device including a printed wiring board on which a circuit component for converting the power to a high frequency voltage is mounted, and a load line for supplying a high frequency voltage to a lighting load. Since the length of the wiring pattern, which is likely to cause noise, is reduced, the influence of noise is reduced, thereby reducing interference with the wiring pattern on the printed wiring board connected to the power supply line. As a result, the power supply The connection point between the line and the wiring pattern and the connection point between the load line and the wiring pattern can be arranged close to each other, which facilitates downsizing of the power supply device. There is an effect that can be.

According to a third aspect of the present invention, there is provided a power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying the high-frequency voltage to a lighting load, comprising: a power supply line connected to the commercial power supply; In a power supply device including a printed wiring board on which a circuit component for converting the power to a high-frequency voltage is mounted, and a load line for supplying a high-frequency voltage to a lighting load, a wiring pattern to which the power line is connected, and a load line The wiring pattern to be connected is formed on the printed wiring board so as to be substantially parallel to each other by a predetermined length, so that currents in opposite phases flow, so that noise generated in one wiring pattern is
The noise is canceled by the opposite polarity noise induced in the other wiring pattern, and the interference can be suppressed. As a result, the connection point between the power supply line and the wiring pattern and the connection point between the load line and the wiring pattern are arranged close to each other. Therefore, there is an effect that downsizing of the power supply device can be facilitated.

[Brief description of the drawings]

FIG. 1 is a front view of a printed wiring board according to a first embodiment.

FIG. 2 is a schematic configuration diagram of the above.

FIG. 3 is a circuit diagram of the same.

FIG. 4 is a schematic configuration diagram of a conventional example.

FIG. 5 is an external view of the above.

[Explanation of symbols]

 Reference Signs List 1 power supply device 5 printed wiring board 5a, 5b connection point 6 power supply line 6a wiring pattern 7 load line 7a wiring pattern

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K073 AA21 AA29 AB01 CG00 CJ14 CK00 CL10 5H007 AA01 BB03 CA01 CB12 CC32 HA03 HA04

Claims (3)

[Claims] 1. A power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying it to a lighting load, wherein the power supply line is connected to a commercial power supply, and the AC voltage supplied through the power supply line is converted into a high-frequency voltage. And a wiring pattern to which the power line is connected in a power supply device having a printed circuit board on which circuit components for mounting the power supply circuit are mounted, and a load line for supplying a high frequency voltage to a lighting load. Are formed on different surfaces of the printed wiring board. 2. A power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying it to a lighting load, wherein the power supply line is connected to a commercial power supply, and the AC voltage supplied through the power supply line is converted into a high-frequency voltage. In a power supply device provided with a printed wiring board on which circuit components for mounting and a load line for supplying a high-frequency voltage to a lighting load, the wiring pattern on the printed wiring board connected to the load line is shortened. Power supply device characterized. 3. A power supply device for converting an AC voltage of a commercial power supply into a high-frequency voltage and supplying it to a lighting load, wherein the power supply line is connected to the commercial power supply, and the AC voltage supplied through the power supply line is converted into a high-frequency voltage. And a wiring pattern to which the power line is connected in a power supply device having a printed circuit board on which circuit components for mounting the power supply circuit are mounted, and a load line for supplying a high frequency voltage to a lighting load. "A power supply device characterized by being formed on a printed wiring board so as to be substantially parallel to each other by a predetermined length, and allowing currents of opposite phases to flow.