JPS6236275Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic component that includes a nonlinear capacitor and is mainly used in a discharge lamp lighting circuit.

As conventional discharge lamp lighting circuits, those of a glow starter type and a rapid starter type are well known. However, the glow starter type has disadvantages such as it takes a long time for the discharge lamp to light up, the glow starter is a contact point, so it must be replaced if it fails, and the discharge lamp tends to deteriorate. . Furthermore, although the rapid starter type has a relatively short start-up time, it requires a dedicated large ballast and a dedicated lamp, which has the disadvantage of being expensive.

To eliminate this drawback of the conventional discharge lamp lighting circuit, as shown in FIG. Connect Cn to the ballast 2 and the preheating filament 1 of the discharge lamp 1
so as to form a serial loop with a and 1b,
A discharge lamp lighting circuit has been proposed in which a three-terminal controlled rectifier Q1 such as a thyristor is connected.

The nonlinear capacitor Cn is made of a ferroelectric ceramic material whose main component is barium titanate, for example, and the relationship between the applied voltage V and the accumulated charge Q has a square characteristic as shown in FIG. shows.

Q2 is a three-terminal controlled rectifier element connected in series with the non-linear capacitor Cn to constitute a charging circuit for the non-linear capacitor Cn, and in this example is constituted by a reverse blocking three-terminal thyristor. A rectifying diode D2 is connected in parallel between the gate and cathode of the three-terminal control rectifier Q2, and the diode D2 is connected in the opposite direction to the gate of the three-terminal control rectifier Q2. Further, a constant voltage diode D3 is connected in parallel between the gate and anode of the three-terminal controlled rectifier Q2. R4 is a resistor connected in parallel with the rectifying diode D2, R5 is a resistor connected in series with the constant voltage diode D3, and R6 is a resistor connected in parallel with the three-terminal control rectifying element Q2.

C2 is connected in parallel to the three-terminal controlled rectifier Q2,
That is, it is a capacitor connected between the anode and cathode of the three-terminal controlled rectifier Q2. This capacitor C2, together with the resistor R6, bypasses the terminal voltage peak value appearing at both ends of the discharge lamp 1 after the discharge lamp is turned on.

D1 is a diode, Q1 is a three-terminal controlled rectifying element through which a preheating current flows, R1 to R3 are resistors constituting the gate circuit of this switching circuit Q1, C1 is also a capacitor, and Q3 is a gate trigger diode.

The nonlinear capacitor Cn is, in this example,
It is constructed by connecting two nonlinear capacitors Cn1 and Cn2 in parallel.

Next, the circuit operation of the above discharge lamp lighting circuit will be explained.

In a positive cycle in which the power supply voltage e rises with the terminal U side being positive, when the three-terminal control rectifier Q1 is turned on, a preheating current flows in the path of the ballast 2 - filament 1a - three-terminal control rectifier Q1 - filament 1b, Filaments 1a, 1b are preheated.

At the same time, nonlinear capacitors Cn1 and Cn2
In order to obtain sufficient switching characteristics, when the power supply voltage e is in the positive cycle, the diode D
2. Through the resistor R5 connected in series to this diode D2 and the constant voltage diode D3 connected in series to the diode D2 and resistor R5, A
Make the side positive and the B side negative and it will be fully charged. In this case, a voltage in the opposite direction is applied between the gate and cathode of the three-terminal controlled rectifier Q2, but since the diode D2 is connected in the opposite direction between the gate and the cathode, the peak gate voltage of the three-terminal controlled rectifier Q2 is reversed. By suppressing the voltage to the forward voltage of the diode D2, it is possible to prevent an overvoltage in the reverse direction from being applied to the gate of the three-terminal control rectifier Q2, thereby preventing its destruction.

In the negative cycle of the power supply voltage e when the preheating current i becomes less than the holding current of the three-terminal controlled rectifier Q1, the three-terminal controlled rectifier Q1 turns off, and a negative power supply voltage is applied between terminals 3 and 4 of the discharge lamp 1. e is applied. When the power supply voltage e is in a negative cycle, a resistor R6 and a capacitor C2 connected in parallel to the resistor R6,
When the voltage Vq divided by the nonlinear capacitor Cn connected in series with these voltages becomes equal to or higher than the operating voltage of the voltage regulator diode D3, a current flows through the voltage regulator diode D3. When current flows through the constant voltage diode D3, a voltage drop is created across the resistor R4 that forward biases the gate of the three-terminal controlled rectifier Q2, which turns on the three-terminal controlled rectifier Q2 and turns it off. Linearity capacitor Cn
Charging current flows into. In this way, if the circuit configuration is such that the voltage at which the three-terminal controlled rectifying element Q2 is turned on is determined by the constant voltage diode D3, the three-terminal controlled rectifying element Q2 will remain unchanged even if the discharge lamp 1 has a different power consumption. , constant voltage diode D3
By selecting , it becomes possible to arbitrarily set the firing timing of the three-terminal control rectifying element Q2. Therefore, it is possible to use the three-terminal control rectifier Q2 having the same characteristics for discharge lamps 1 having different power consumptions, improving mass productivity and reducing costs.

When the nonlinear capacitor Cn is saturated by the charging current, a pulsed back electromotive force is generated by the ballast 2 and is applied between the terminals 3 and 4 of the discharge lamp 1.
When the current flowing into the nonlinear capacitor Cn becomes less than the holding current of the three-terminal controlled rectifier Q2, the three-terminal controlled rectifier Q2 turns off, and the power supply voltage increases until the three-terminal controlled rectifier Q2 turns on again. A voltage is applied to both ends of the discharge lamp 1. Thereafter, this state continues until the discharge lamp 1 is lit.

After the discharge lamp 1 is lit, the voltage across both terminals of the discharge lamp 1 is the voltage applied to the nonlinear capacitor Cn.
The voltage is divided into Vcn and the aforementioned terminal voltage Vq. In this case, it consists of a capacitor C2 connected in series with the nonlinear capacitor Cn and a resistor R6 connected in parallel to this capacitor C2.
The RC bypass circuit connects terminals 3-4 of discharge lamp 1.
Since the peak voltage containing a high frequency component of 1 to 2 KHz indicating the peak value of the voltage between the three terminals is bypassed, the three-terminal control rectifier Q2 is turned on again by the voltage Vq after the discharge lamp 1 is turned on. There is no light, the lighting is stable, and filament 1
It won't hurt a or 1b.

As mentioned above, this discharge lamp lighting circuit cleverly utilizes the characteristics of the nonlinear capacitor Cn to
The startup time from power on to the discharge lamp lighting is about 0.8 seconds at the longest, which is much shorter than the 2 to 8 seconds startup time of conventional glow starters, and it is a rapid starter method. It is possible to realize a discharge lamp lighting circuit that is significantly smaller than the conventional one.

However, the nonlinear capacitor Cn, which constitutes the main component of the discharge lamp lighting circuit, is always accompanied by an electrostrictive phenomenon when voltage is applied. For this reason, when commercializing the discharge lamp lighting circuit, if the nonlinear capacitor Cn is mounted on a printed circuit board using the conventional method, the nonlinear capacitor Cn will be damaged during lighting operation. There was a problem that vibration noise was generated due to the electrostrictive phenomenon. This vibration noise gives the user a sense of discomfort and anxiety, and the number of occurrences of the high pulse voltage peculiar to this element Cn may burn out the filaments 1a and 1b or have a negative impact on other circuit elements. It is something. Moreover, the vibration noise accompanying this electrostrictive phenomenon is caused by the nonlinear capacitor Cn
If a thick lead wire is used to increase the support stability of the lead wire, the lead wire tends to become larger in proportion to its thickness and hardness. In other words, when a nonlinear capacitor Cn is supported only by its lead wires, it is modeled as a cantilever beam as shown in Figure 3, and its natural frequency fo is fo = √ where α is the stiffness of the lead wires. m is the mass of the nonlinear capacitor Cn. Here, when the natural frequency fo exceeds a certain frequency, it becomes an audible range, and the nonlinear capacitor
The radiation efficiency of sound from Cn also increases, and these become noises that cause discomfort to humans. The stiffness α of the lead wire is α=E・S/L where S is the wire diameter of the lead wire L is the length of the lead wire E is the Young's modulus of the lead wire As is clear from the above formula, the stiffness α is the lead wire tends to increase in proportion to the wire diameter S and Young's modulus E.

Therefore, the present invention is designed to
When configuring a circuit that requires a nonlinear capacitor, it can be easily and reliably mounted on a printed circuit board, etc., and the noise caused by the electrostrictive phenomenon of the nonlinear capacitor can be reduced. The purpose is to provide electronic components.

In order to achieve the above object, an electronic component according to the present invention includes a support made of an insulating elastic material having a groove on the outer periphery and a hole in the center, and a nonlinear capacitor. It is characterized in that it is inserted into a mounting hole of a printed circuit board, an edge of the printed circuit board is elastically held in the groove, and the nonlinear capacitor is press-fitted and locked in the hole.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically described below with reference to the accompanying drawings, which are examples. FIG. 4 is a front sectional view of the electronic component according to the present invention, FIG. 5 is a plan view thereof, and FIG. 6 is a side view thereof. In the figure, Cn is a nonlinear capacitor. The number of nonlinear capacitors Cn may be two or more depending on the circuit configuration of the discharge lamp lighting circuit.

5 is a support made of an insulating elastic material such as rubber. This support 5 is the non-linear capacitor.
It is for supporting Cn, and is formed into a substantially rectangular shape, and the nonlinear capacitor is placed in the center of the rectangular shape.
A through hole 6 that matches the external shape and number of Cn is provided, and a nonlinear capacitor is placed inside this hole 6.
Cn is inserted, and the elastic force of the support body 5 is applied to the Cn to press fit into the hole 6 and lock it.

Furthermore, a groove 7 is provided on the outer periphery of the support body 5 to serve as an insertion portion when the support body 5 is inserted into a printed circuit board or the like. In this embodiment, the groove 7 is provided around the entire circumference of the support 5.

Since the electronic component according to the present invention has the above-described structure, when the discharge lamp lighting circuit is mounted on a printed circuit board and commercialized as a circuit unit, it is necessary to prepare the printed circuit in advance as shown in FIG. 7A. A mounting hole 9 that fits into the groove 7 of the support 5 is provided in the board 8, and the support 5 is inserted into the mounting hole 9 to elastically clamp the edge of the printed circuit board 8 in the groove 7. By doing so, the support 5 is elastically attached and fixed to the printed circuit board 8, and then a nonlinear capacitor is inserted into the hole 6 of the support 5, as shown in FIG. 7B.
It is only necessary to press-fit and lock Cn and solder the electrode leads 10 and 11 to the conductor patterns 12 and 13 on the printed circuit board 8. Thereby, the nonlinear capacitor Cn is elastically mounted on the printed circuit board 8 by the support 5.

electrode lead wire 10 of nonlinear capacitor Cn,
11 is soldered to the center of the nonlinear capacitor Cn, as shown in FIG. 8, or soldered to the end protruding from the hole 6 of the support 5, as shown in FIG. However, it is also possible to adopt a structure in which the conductor patterns 12 and 13 are led out through the inside of the hole 6. Furthermore, as shown in FIG. 10, by applying dip solder or insulation coating 14 to the entire nonlinear capacitor Cn, silver migration occurs when the electrodes of the nonlinear capacitor Cn are baked with silver paste. can be prevented and moisture resistance can be improved.

As mentioned above, according to the present invention, the support 5 is elastically inserted into the mounting hole 9 of the printed circuit board 8, and then the nonlinear capacitor Cn is inserted into the support 5.
Just press fit into the hole 6 of the printed circuit board 5.
Since the assembly of the nonlinear capacitor Cn is completed, the assembly work becomes very simple and easy, and automatic insertion by an automatic insertion machine becomes possible.
Moreover, when the nonlinear capacitor Cn is press-fitted into the hole 6 of the support 5, the support 5 swells outward.
This acts to press the bottom part 7a of the groove 7 provided on the outer periphery against the edge of the mounting hole 9 of the printed circuit board 8, so that the space between the printed circuit board 8 and the support 5 and between the support 5 and the The elastic force of the support body 5 is applied to the linear capacitor Cn, and each part is fixed to each other in close contact with no gaps, without causing any loosening.

In addition, in this invention, a nonlinear capacitor
Since Cn is mounted on the printed circuit board 8 by the support 5 made of an insulating elastic material, even if an electrostrictive phenomenon occurs in the nonlinear capacitor Cn, it will not be affected by the elastic buffering effect of the support 5. The vibration noise is alleviated. Moreover, since a strong mounting structure can be formed by the support body 5, non-linear capacitors can be
The Cn electrode lead wires 10 and 11 can be used exclusively as conduction wires rather than as support wires. Therefore, the lead wires 10 and 11 can be made very thin, and the vibration noise caused by the electrostrictive phenomenon can be further reduced. The wire diameter of lead wires 10 and 11 is
A material with a diameter of 0.3φ or less is effective in damping vibration noise.
By using lead wires 10 and 11 with such wire diameters and increasing their length, the natural frequency of the system modeled in FIG. 3 can be lowered, and the level of audible sound having an adverse effect can be lowered. I can do it. Further, the sound components transmitted to the printed circuit board 8 through the lead wires 10 and 11 are only low frequency components, and the noise transmitted to and radiated from the board 8 is reduced to a level that does not pose a problem.

As mentioned above, the electronic component according to the present invention is
A support made of an insulating elastic material having a groove on the outer periphery and a hole in the center, and a non-linear capacitor, and the support is inserted into a mounting hole of a printed circuit board into the groove. Since the edge of the printed circuit board is elastically held and the nonlinear capacitor is press-fitted into the hole, the nonlinear capacitor is not required, such as in a discharge lamp lighting circuit. To provide an electronic component that can be easily and reliably mounted on a printed circuit board, etc., and that can reduce noise caused by the electrostrictive phenomenon of a nonlinear capacitor when configuring a circuit. I can do it.

[Brief explanation of drawings]

Figure 1 is an electric circuit connection diagram of a discharge lamp lighting circuit, Figure 2 is a diagram of applied voltage vs. accumulated charge characteristics of a non-linear capacitor, and Figure 3 is a model of the non-linear capacitor supported by a lead wire. 4 is a front partial sectional view of an electronic component according to the present invention, FIG. 5 is a plan view thereof, FIG. 6 is a side partial sectional view thereof, and FIGS. 7 A and B are according to the present invention. A diagram showing a method of assembling electronic components to a printed circuit board,
8 to 10 are front partial cross-sectional views showing still other embodiments of the electronic component according to the present invention. 1... Discharge lamp, 2... Ballast, 5... Support,
6...hole, 7...groove, 8...printed circuit board,
9...Mounting hole, Cn...Nonlinear capacitor.

Claims (1)

[Claims for Utility Model Registration] (1) A support made of an insulating elastic material having a groove on the outer periphery and a hole in the center, and a nonlinear capacitor, and the support is attached to a printed circuit board. An electronic component, characterized in that the nonlinear capacitor is inserted into a mounting hole, an end edge of a printed circuit board is elastically held in the groove, and the nonlinear capacitor is press-fitted into the hole. (2) The electronic component according to claim 1, wherein the nonlinear capacitor has an electrode lead wire with a wire diameter of 0.3φ or less.