JP2002352683A - Automatic electronic flasher unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic electronic flasher unit capable of preventing operation fault due to drop in insulation impedance of an internal circuit caused by intrusion of water from external environment. SOLUTION: In a circuit block 6, a solar cell 11 for generating a voltage according to the brightness of the external light and a MOSFET 12 turned on and off by the voltage generated by the solar cell 11 are mounted on the front side of a printed circuit board 10, a voltage control circuit for controlling the voltage generated by the solar cell 11 is composed of a resistor 13 and a capacitor 14 of surface-mounted components and mounted on the back side of the circuit board 10, and the resistor 13 and the capacitor 14 are sealed with a sealing material 15, so that the intrusion of water from the outside environment can be prevented and thus the operation fault due to the drop in insulation impedance of the voltage control circuit can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic automatic blinker for turning on and off a power supply to a load according to the brightness of external light.

[0002]

2. Description of the Related Art Conventionally, there has been provided an electronic automatic flasher which detects the brightness of external light and turns on an illumination load when the external light becomes equal to or less than a specified brightness. This conventional electronic flasher includes a solar cell that is a photovoltaic element that generates a voltage according to the brightness of external light, a voltage control circuit that controls the voltage generated by the solar cell, And a MOSFET which is a semiconductor switch which is turned on / off in response to a voltage generated by the MOSFET.
T, or an electromagnetic relay or a semiconductor power switch driven by this MOSFET turns on and off according to the brightness of external light, thereby causing the lighting load to blink. According to this conventional configuration, since the MOSFET is directly controlled by the power generated by the solar cell, a control power supply is unnecessary, the standby power at the time of turning off can be eliminated, and the size of a control circuit such as a power supply circuit can be reduced. It is possible to reduce the cost.

[0003]

However, in the configuration of the above-mentioned conventional electronic automatic blinker, since the solar cell as the photovoltaic element is very small, a voltage control circuit for controlling the generated electromotive voltage is required. Controls the on / off of the MOSFET with a voltage corresponding to the brightness of the external light using a resistor having a very large resistance value.Therefore, between the elements such as the resistance of the voltage control circuit, between the electrodes of the solar cell, and the gate of the MOSFET. -The impedance between the sources is very large, and when the voltage control circuit is mounted on a printed circuit board, moisture may enter inside depending on the external moisture environment, and the insulation impedance between elements such as the resistance of the voltage control circuit will decrease. Therefore, the insulation impedance between the electrodes of the solar cell and between the gate and source of the MOSFET also decreases, and the electromotive force generated in the solar cell flows as a leakage current and the MOS There is a problem that can not be controlled with ET.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an electronic automatic flashing device which prevents malfunctions due to a decrease in insulation impedance of an internal circuit caused by intrusion of moisture from an external environment. To provide equipment.

[0005]

According to a first aspect of the present invention, there is provided a photovoltaic element for generating a voltage between output electrodes in accordance with the brightness of external light, and a photovoltaic element which is turned on and off by a voltage generated by the photovoltaic element. A semiconductor switch to be turned off, output means for turning on / off an external load by turning on / off the semiconductor switch, and a control terminal-ground terminal between the output electrodes of the photovoltaic element mounted on a printed circuit board and the semiconductor switch A voltage control circuit connected between the photovoltaic elements to control a voltage generated by the photovoltaic element, wherein the voltage control circuit is sealed on the printed circuit board by a sealing material, and the photovoltaic element is A battery, wherein the semiconductor switch is a MOSFE
T, wherein the output means is the MOSFET or an electromagnetic relay driven by the output of the MOSFET.

According to a second aspect of the present invention, in the first aspect, the voltage control circuit comprises a resistor and a capacitor, which are surface mount components.

According to a third aspect of the present invention, in the first aspect of the present invention, silk-screen printing is performed on the printed circuit board around a region where the sealing material seals the voltage control circuit. Is provided.

A fourth aspect of the present invention is characterized in that, in the third aspect of the present invention, the silk printing has a plurality of concentric ring shapes.

According to a fifth aspect of the present invention, in the first aspect, the voltage control circuit is mounted on one surface of the printed circuit board, and the photovoltaic element and the semiconductor switch are connected to each other on the other side of the printed circuit board. The voltage control circuit is mounted on a surface, and the voltage control circuit, the photovoltaic element, and the semiconductor switch are connected via a through hole formed in the printed circuit board.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the printed circuit board includes a circuit pattern for connecting the voltage control circuit, the photovoltaic element, and the semiconductor switch to each other. It is characterized by silk printing on the top.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 5, the electronic automatic blinker according to the present embodiment includes a circuit block 6 for detecting ambient light and blinking a lighting device or the like based on the amount of external light, a terminal plate 4 and the terminals. A terminal block 24 composed of a screw block 5 screwed into a notch of the plate and connected to wiring from an external power supply and a load such as a fluorescent lamp; and a circuit block 6 formed in a box shape having an opening on the front surface. A base 1 for holding the terminal block 24 in the opening, a light-receiving cover 2 attached to the front surface of the base 1 to take in external light into the circuit block 6 via the transmission section 2a, and a portion corresponding to the transmission section 2a. A cover 3 having an opening and attached to the front surface of the light receiving cover 2;
And a mounting bracket 7 for fixing the electronic automatic flasher to a structure such as a utility pole by screwing it to a protrusion on the rear surface of the electronic flasher.

FIG. 1 is a sectional view of the circuit block 6,
FIG. 2 is an enlarged partial sectional view, FIGS. 3A and 3B are a front view and a rear view, respectively, and FIG. 4 is a perspective view. The circuit block 6
A solar cell 11 that is a photovoltaic element that generates a voltage corresponding to the brightness of external light, and a MOSFET that is a semiconductor switch that is turned on and off by the voltage generated by the solar cell 11
12 are mounted on the front side of the printed circuit board 10, and the electrodes 11a and 11b of the solar cell 11 are connected to the gate 12a and the source 12b of the MOSFET 12 via the circuit pattern 19a.

A voltage control circuit for controlling the voltage generated by the solar cell 11 includes a resistor 13 and a capacitor 1 which are surface mount components.
4 and mounted on the rear surface side of the printed circuit board 10 and connected to the circuit pattern 19a on the front surface via the circuit pattern 19b and the through hole 22.

The electromagnetic relay 23 disposed on the rear side of the printed circuit board 10 is controlled to open and close a contact by turning on and off the MOSFET 12, and an output means for controlling the blinking of a load such as a lighting fixture by opening and closing the contact. (The electromagnetic relay 23 is not shown in FIGS. 1 and 2).
In the present embodiment, the electromagnetic relay 23 is used as the output means. However, a semiconductor power switch may be used, and when the load capacity is small, the MOSFET 12 may be directly connected to the load to constitute the output means.

A liquid crystal plate 18 is held by a holding frame 25 on the front side of the solar cell 11 which is an incident path of external light, and the liquid crystal plate 18 is a light amount whose transmittance changes according to the strength of an electric field applied to the liquid crystal. It is an adjustment member, and the external light and the MOSFET 12
A hysteresis characteristic is given to the relationship between the on and off states of the switch.

Here, the resistor 1 constituting the voltage control circuit
3. Since the capacitor 14 is sealed with the sealing material 15, the penetration of moisture from the external environment is prevented, and the insulation impedance of the voltage control circuit including the resistor 13 and the capacitor 14 is reduced, so that the solar cell 11 can be used. It is possible to prevent an operation failure due to the generated electromotive force flowing as a leakage current. Since the resistor 13 and the capacitor 14 are surface mount components, the sealing material 1 is placed on the printed circuit board 10.
5 can be applied directly, and a silk sealing frame 2 made of an epoxy material is
1 is silk-printed in a ring shape.
Moisture entering from the interface between the substrate and the printed circuit board 10 can be further reduced.

The solar cell 11 and the MOSFET 1
2 is also sealed by the sealing materials 16 and 17, respectively, so that the invasion of moisture from the external environment is prevented, and the insulation impedance between the electrodes 11a and 11b of the solar cell 11 and the gate and source of the MOSFET 12 is reduced. It is possible to prevent malfunction due to the decrease. Further, the sealing material 16, 1
7, silk-sealing frames 26 and 27 made of an epoxy material are silk-printed on the outer periphery of each application region.
Moisture entering from the interface between the printed circuit board 10 and the printed circuit board 10 can be further reduced.

A voltage control circuit composed of a resistor 13 and a capacitor 14, and a solar cell 11 and a MOSFET 12, which are sealed in a process different from the voltage control circuit, are mounted on different surfaces of the printed circuit board 10. Circuit pattern 1
Since 9a and 19b are connected by through hole 22,
The entire circuit is configured to be small and the electrodes 11a of the solar cell 11 are
11b, the gate 12a of the MOSFET 12, the source 1
2b, the circuit pattern between the resistor 13 and the capacitor 14 can be shortened, the area where moisture enters from the external environment can be reduced, and malfunctions due to a decrease in insulation impedance can be prevented. it can.

Further, a water-proof silk pattern 20 is formed on the circuit pattern 19a by silk-screen printing to prevent moisture from entering the circuit pattern 19a.

As shown in FIGS. 6A and 6B,
The silk sealing frame 21 made of an epoxy material applied to the outer periphery of the application region of the sealing material 15 may be formed in a concentric double ring shape, and penetrates from an interface between the sealing material 15 and the printed circuit board 10. The moisture can be further reduced as compared with the case where the sealing material 15 is applied, and even if the sealing material 15 leaks from the inner silk sealing frame 21 to the outside during the application of the sealing material 15, the outer silk sealing is performed. The frame 21 can prevent the outflow to the outside.

[0022]

According to the first aspect of the present invention, there is provided a photovoltaic element for generating a voltage between output electrodes in accordance with the brightness of external light, and a semiconductor which is turned on / off by the voltage generated by the photovoltaic element. A switch, output means for turning on / off an external load by turning on / off the semiconductor switch, and connected between output electrodes of the photovoltaic elements mounted on a printed circuit board and between a control terminal and a ground terminal of the semiconductor switch. A voltage control circuit for controlling the voltage generated by the photovoltaic element, the voltage control circuit is sealed with a sealing material on the printed circuit board, the photovoltaic element is a solar cell, The semiconductor switch is a MOSFET, and the output means is the MOSFET or the MOSFET.
Since the electromagnetic relay is driven by the output of the voltage control circuit, it is possible to prevent water from invading from an external environment and to prevent malfunction due to a decrease in insulation impedance of the voltage control circuit.

According to a second aspect of the present invention, in the first aspect, the voltage control circuit includes a resistor and a capacitor, which are surface-mounted components, so that a sealing material can be directly applied on a printed circuit board. The effect can be obtained.

According to a third aspect of the present invention, in the first aspect of the present invention, silk-screen printing is performed on the printed circuit board around a region where the sealing material seals the voltage control circuit. Is applied, it is possible to obtain an effect that the moisture entering from the interface between the sealing material and the printed board can be further reduced.

According to a fourth aspect of the present invention, in the third aspect of the present invention, since the silk printing has a plurality of concentric ring shapes, the silk printing removes moisture entering from an interface between the sealing material and the printed board. Even if the sealing material leaks from the inside silk printing to the outside at the time of application of the sealing material, it can be prevented from flowing out by the outside silk printing even when the sealing material is applied. The effect that can be obtained can be obtained.

According to a fifth aspect of the present invention, in the first aspect, the voltage control circuit is mounted on one surface of the printed circuit board, and the photovoltaic element and the semiconductor switch are connected to each other on the other side of the printed circuit board. Mounted on a surface, the voltage control circuit, the photovoltaic element, and the semiconductor switch are connected via through holes formed in the printed circuit board, so that the entire circuit is configured to be small and the photovoltaic voltage is reduced. element,
A circuit pattern between the semiconductor switch and the voltage control circuit can be shortened, a region into which moisture enters from an external environment can be reduced, and operation failure due to a decrease in insulation impedance can be prevented. The effect described above can be obtained.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the printed circuit board includes a circuit pattern for connecting the voltage control circuit, the photovoltaic element, and the semiconductor switch to each other. Since silk printing is performed on the upper side, it is possible to obtain an effect that it is possible to prevent moisture from entering a circuit pattern and prevent an operation failure due to a decrease in insulation impedance.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a circuit block according to an embodiment of the present invention.

FIG. 2 is an enlarged partial cross-sectional view showing a circuit block according to the embodiment of the present invention.

FIG. 3A is a front view showing a circuit block according to an embodiment of the present invention. FIG. 2B is a rear view illustrating a circuit block according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a circuit block according to the embodiment of the present invention.

FIG. 5 is an overall perspective exploded view showing the electronic automatic flasher according to the embodiment of the present invention.

FIG. 6A is a plan view showing a multiple silk sealing frame according to an embodiment of the present invention. (B) It is sectional drawing which shows the multiple silk sealing frame of embodiment of this invention.

[Explanation of symbols]

 Reference Signs List 6 circuit block 10 printed circuit board 11 solar cell 12 MOSFET 13 resistor 14 capacitor 15 sealing material

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Norihiro Murata 1048 Kadoma Kadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd. (72) Inventor Yoshinori Akinari 1048 Kadoma Kadoma, Kadoma City, Osaka Prefecture, Japan Matsushita Electric Works, Ltd. (72) Inventor Kenji Okada, 1048 Kadoma Odashi, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. 1048 Kadoma Ichidai Matsushita Electric Works Co., Ltd. F-term (reference) 5G052 AA05 HA05 5G055 AA01 AA07 AA15 AD04 AE48 AE53 5J050 AA32 AA47 BB16 CC07 DD08

Claims (6)

[Claims] 1. A photovoltaic element that generates a voltage between output electrodes according to the brightness of external light, a semiconductor switch that is turned on and off by a voltage generated by the photovoltaic element, Turns on / off the external load
An output means for turning off, and a voltage control circuit mounted on a printed circuit board and connected between output electrodes of the photovoltaic element and between a control terminal and a ground terminal of the semiconductor switch to control a voltage generated by the photovoltaic element. Wherein the voltage control circuit is sealed in the printed circuit board with a sealing material, the photovoltaic element is a solar cell, the semiconductor switch is a MOSFET, and the output means is the M
An electronic automatic blinker, which is an electromagnetic relay driven by an output of an OSFET or the MOSFET. 2. The voltage control circuit according to claim 1, wherein the voltage control circuit includes a resistor and a capacitor, which are surface-mounted components.
Electronic flasher as described. 3. A silk screen forming a frame of the sealing material is applied to an outer periphery of a region of the printed circuit board where the sealing material seals the voltage control circuit. Electronic flasher according to claim 1. 4. The electronic automatic flasher according to claim 3, wherein the silk printing has a plurality of ring shapes concentrically. 5. The voltage control circuit is mounted on one surface of the printed circuit board, and the photovoltaic element and the semiconductor switch are mounted on the other surface of the printed circuit board,
The electronic automatic flasher according to claim 1, wherein the voltage control circuit, the photovoltaic element, and the semiconductor switch are connected through a through hole formed in the printed circuit board. 6. The printed circuit board includes the voltage control circuit,
6. The electronic automatic flasher according to claim 5, further comprising a circuit pattern for connecting the photovoltaic element and the semiconductor switch to each other, wherein silk circuit printing is performed on the circuit pattern.