JP2002176193A - Insulating mounting module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulation mounting module in which low power genera tion efficiency and low optical output of a photovoltaic element can be complemented and a required power can be obtained while reducing the overall size. SOLUTION: The insulation mounting module comprises first and second multilayer printed boards 31 and 32 wherein the first multilayer printed board 31 is provided with recesses 33 for mounting a plurality of light emitting elements 21 constituting power generation pairs 2 and the second multilayer printed board 32 is provided with recesses 34 for mounting a plurality of photovoltaic elements 22 constituting the power generation pairs 2. The multilayer printed boards 31 and 32 are bonded through adhesive such that the recesses 33 and 34 face each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated mounting module having an improved configuration and mounting of a direct current (DC) power supply circuit requiring electrical insulation among electronic circuits.

[0002]

2. Description of the Related Art Although there are many examples of conventional isolated DC power supplies, most of them are switching power supplies using transformers.

FIG. 6 shows a simple half-wave rectification type insulated regulator as an example of the prior art. This includes a transformer 11, a switching element 12, an oscillator 13, a snubber circuit 14, a rectifying diode 15, and a commutating diode 1.
6. Smoothing filter inductor 17 and smoothing filter capacitor 18.

A transformer 11 converts a voltage Vin applied to a primary terminal into a switching element (transistor or the like) 12.
To obtain an output voltage transformed to the secondary side. The oscillator 13 is for driving the switching element 12.

[0005] The snubber circuit 14 protects the switching element 12 from a surge caused by switching. A voltage proportional to the turns ratio between the primary side and the secondary side is generated on the secondary side of the transformer 11. Rectifier diode 1
The secondary side voltage of the transformer 11 half-wave rectified by 5 is smoothed by removing a ripple by a filter including an inductor 17 and a capacitor 18, and is output as an output voltage Vout of an isolated regulator. The commutation diode 16 has a function of commutating the energy stored in the inductor 17 when the rectifier diode 15 conducts, when the rectifier diode 15 cuts off.

[0006] In the above-mentioned conventional insulated regulator, the transformer 11 is formed by winding the primary winding and the secondary winding 11b around the iron core 11a. Due to the high cost, special measures are required for the fixing method in harsh environments. Also, radiation noise and conduction noise due to switching harmonics are large, and many additional parts such as filters are required as countermeasures. In particular, it is difficult to use it for a device having high noise sensitivity.

In view of the above, in the case where electrical isolation between circuits is performed in order to reduce noise and avoid the influence of ground level displacement, recently, an isolated independent power supply using a DC / DC converter, a photocoupler, and an isolator have been proposed. Some are configured to two-dimensionally mount an insulation type component such as a configuration amplifier on the surface of a printed circuit board.

[0008]

As described above, when components such as an isolated type independent power supply and a photocoupler are two-dimensionally mounted on the surface of a printed circuit board, a large mounting area is required and the device becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and compensates for the problems of the prior art, that is, the power generation efficiency of the photovoltaic element is low and the light output of the light emitting element is small. It is an object of the present invention to provide an insulated mounting module that can obtain required electric power and can be downsized as a whole.

[0010]

According to a first aspect of the present invention, a light emitting device and a photovoltaic device that receives light from the light emitting device to obtain an electromotive force are provided. A plurality of power generating pairs arranged are mounted on the same substrate, and a plurality of power generating pair serial circuits are formed by connecting some of the power generating pairs in series, and the power generating pair serial circuits are connected in parallel. An insulation-type mounting module characterized by the following.

In order to achieve the above object, an invention according to claim 2 comprises a first and a second multilayer printed circuit board, wherein the first multilayer printed circuit board includes a plurality of light emitting elements constituting the power generation pair. The second multilayer printed circuit board is provided with a recess for accommodating a plurality of photovoltaic elements constituting the power generation pair, and the first multilayer printed circuit board is provided with a recess for accommodating a plurality of photovoltaic elements. 2. The insulated mounting module according to claim 1, wherein the two are coupled such that the depressions of the second multilayer printed board face each other. 3.

In order to achieve the above object, a third aspect of the present invention comprises a plurality of insulated power supplies, each of which is provided with a surface light emitting element and a light input from the surface light emitting element. A plurality of power generation pairs each having a photovoltaic element array for obtaining electric power disposed opposite to each other are mounted on the same substrate, and a plurality of power generation pair series circuits formed by connecting some of the power generation pairs in series are provided. The insulated power supplies are connected in parallel in a predetermined direction so that the voltage, current capacity and the number of independent power supplies can be changed by external wiring. An insulated power supply module characterized in that:

According to a fourth aspect of the present invention, there is provided a power generation pair comprising a light emitting element and a photovoltaic element which receives light from the light emitting element and obtains an electromotive force. Are mounted on the same substrate, a plurality of power generation pair series circuits formed by connecting some of the power generation pairs in series, a plurality of sets are configured, and the power generation pair series circuits are connected in parallel, An isolated power supply module characterized in that the primary input power supply of the power generation pair series circuit is switched by a pulse width modulation signal and regenerated by a circuit including an inductor and a diode.

[0014]

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

FIG. 1 is a circuit diagram showing a first embodiment of the insulated mounting module according to the present invention. This insulated mounting module includes a plurality of power generation pairs 2 in which a light emitting element 21 and a photovoltaic element 22 that receives light from the light emitting element 21 to obtain an electromotive force are arranged on the same substrate. A plurality of power generation pair series circuits, each of which includes a plurality of power generation pairs 2 connected in series, are configured, and the power generation pair series circuits are connected in parallel.

The specific configuration is as follows: a light emitting element 21 composed of a light emitting diode, a semiconductor laser or the like; a photovoltaic element (so-called solar cell) 22 composed of a photodiode or the like; a current limiting resistor 23; a capacitor 24; The switching device 26 includes a diode 25 and a transistor.

The light emitting element 21 is opposed to the photovoltaic element 22, and the light from the light emitting element 21 is received by the photovoltaic element 22 to generate power. Since the power generation efficiency of the photovoltaic element 22 is low and the light output of the light emitting element 21 is small, in order to obtain an output voltage, the power generation pair 2 composed of the light emitting element 21 and the photovoltaic element 22 is connected in series, In order to obtain the capacity, a plurality of them are connected in parallel to obtain the required power. The current limiting resistor 23 is for limiting the current flowing through the light emitting element 21.

The capacitor 24 is a capacitor that also serves as a bypass capacitor for stabilizing the output and for supplying instantaneous power. The smoothing diode 25 prevents the charge of the capacitor 24 from decreasing due to leakage of the solar cell 22 when the switching device 26 is off.

Since the primary side consumes constant power irrespective of the power consumption of the secondary load, in order to increase the power efficiency, the switching device 26 is set in accordance with the secondary side load power consumption. The power supply to the primary side is turned on / off to minimize necessary power.

FIGS. 2A and 2B are views for explaining a mounting state in the first embodiment according to the present invention. FIG. 2A is an exploded perspective view (separated bird's-eye view), and FIG. ,
FIG. 2C shows a sectional view after assembly. This insulated mounting module comprises a first multilayer printed circuit board 31 and a second
The first multilayer printed circuit board 31 has a recess (a recess cut in accordance with the shape of a pair chip) 33 for accommodating and fixing a plurality of light emitting elements 21 constituting the power generation pair 2. The second multilayer printed circuit board 32 is formed with a depression (a depression cut in accordance with the shape of the paired chip) 34 for accommodating and fixing a plurality of photovoltaic elements 22 constituting the power generation pair 2. The multilayer printed circuit boards 31 and 32 are bonded to each other by, for example, an adhesive (not shown) so that the depressions 33 and 34 of the first multilayer printed board 31 and the second multilayer printed board 32 face each other. .

The light emitting element 21, the photovoltaic element 22, the current limiting resistor 23, the capacitor 24, and the leakage current limiting diode 2 will be described below with reference to the drawings.
5 and the switching device 26 show implementations corresponding to the respective components of FIG.

The multilayer printed circuit boards 31 and 32 are for mounting and wiring these components 21 to 26. The depression 33 is formed so that the surface layer and the second to fourth layers of the multilayer printed board 31 are housed and fixed in the light emitting element 21. A recess 34 for accommodating and fixing a plurality of photovoltaic elements 22 to the surface layer and about the second to fourth layers of the multilayer printed board 32 is formed.

Power is supplied to the paired chip by bonding or soldering the anode-side surface of the paired chip to the inner layer wiring of the printed circuit board with a conductive adhesive. The cathode side is also connected to the inner layer pattern by wire bonding 28. A plurality of such structures are two-dimensionally arranged on one printed circuit board, and the electrical connection between the respective light emitting elements is also realized by the printed pattern of the printed circuit board.

The primary side resistor 23 and the primary power supply switching device 26 are mounted on the surface of the printed circuit board on the light emitting element side (the back side in FIG. 2). The secondary-side capacitor 24 and the diode 25 are mounted on the surface of the printed circuit board on the solar cell side.

According to the first embodiment described above, the following operational effects can be obtained. Since a plurality of power generation pairs 2 including the light emitting element 21 and the photovoltaic element 22 are connected in series, and a plurality of power generation pair series circuits obtained thereby are connected in parallel, the power generation efficiency of the photovoltaic element 22 is low. In addition, the light output of the light emitting element 21 can compensate for a small point, and required power can be obtained.

The output power per unit area achievable with the present power supply is very small in the energy efficiency of the conventional light emitting element and solar cell, so that many power generation pairs (light emitting element + photovoltaic element) are required. For example, if the output of one light emitting element is 10 mW and the conversion efficiency of the photovoltaic element is 10%, 1000 pairs are required to obtain an output of 1 W. If it is simply realized by using a commercially available device (LED lamp or LD) and a solar cell panel, the size becomes very large. However, by employing the mounting method shown in FIG. 2, most of the necessary components are three-dimensionally mounted inside the printed circuit board, so that the space required for the power supply can be significantly reduced.

Since the primary side and the secondary side transmit energy in space by light, they have high electrical insulation. If the switching operation by the switching device 26 is further restricted (or remains ON),
The output on the secondary side can be suppressed to extremely low noise.

When the light-emitting elements 21 are formed into a light-emitting element array in which a plurality of light-emitting elements 21 are arranged one-dimensionally or two-dimensionally on one semiconductor chip, the degree of integration is increased and the power output per unit area of the power supply is reduced. The primary side, which can improve and reduce the number of manufacturing steps, consumes constant power regardless of the power consumption of the secondary side load. By turning on / off the switching device 26 in accordance with the load power consumption on the primary side, the supply power on the primary side can be minimized. When the switching device 26 is turned off by the smoothing diode 25, it is possible to prevent the charge of the capacitor 24 from decreasing due to leakage of the light receiving element 22.

The above-described pair chip of the surface emitting type light emitting diode (LED) or laser diode (LD) is a light emitting element in which a plurality of light emitting elements are arranged one-dimensionally or two-dimensionally on one semiconductor chip. It may be an array.

FIG. 3 is a circuit diagram for explaining a second embodiment according to the present invention, and FIG. 4 is a diagram for explaining a mounting state corresponding to the circuit diagram of FIG. In the above-described first embodiment, the insulated power supply is formed in one stage. However, in the second embodiment, one (one sheet) is obtained by combining three-dimensionally independent insulated power supplies 48, 49, and 50. 2) shows a power supply circuit formed on the multilayer printed circuit board.

Each of the insulated power supplies 48, 49, and 50 includes a power generation pair in which a surface light-emitting element and a photovoltaic element array that receives light from the surface light-emitting element to obtain an electromotive force are opposed to each other. A plurality of power generation pair series circuits are mounted on the same substrate, and some of the power generation pairs are connected in series to form a plurality of sets, and the power generation pair series circuits are connected in parallel. The mold power supplies 48, 49, and 50 are three-dimensionally combined in a predetermined direction, for example, in a vertical direction, and the voltage, current capacity, and number of independent power supplies can be changed by external wiring. Each of the insulated power supplies 48, 49, 50
A surface light emitting element 41, a photovoltaic element array (so-called solar cell) 42, and a current limiting resistor 4 for the surface light emitting element 41, respectively.
3. Consisting of an output stabilizing capacitor 44, a common output stabilizing capacitor 45, a leakage current limiting diode 46, and a common switching element (eg, a transistor)
It consists of 47.

The surface light emitting elements 41 are two-dimensionally arranged in each layer. The switching element 47 is for turning on / off the primary current.

The multilayer printed circuit board 51 includes surface light emitting devices 41 to 41.
This is for mounting components up to the switching element 47. The wire bonding 52 is for connecting the surface light emitting element 41 and the photovoltaic element array 42, and the wiring 53 is for connecting input and output of the power supplies 48 to 50.

In the second embodiment described above, each of the power supplies 48 to 50 in FIG. 3 has the same configuration as that of the first embodiment, and as shown in FIG. It is realized by connecting in three directions and connecting three-dimensionally. The connection of each block is performed by bonding. Also, as shown in FIG. 5, electrical connection between the blocks can be made by wiring on the printed circuit board and wiring 53 outside.
These external wirings can be in the form of a harness using a connector.

As described above, in the second embodiment, the three-dimensional combination of the two-dimensionally configured power supplies in the first embodiment enables the area of the printed circuit board to be increased without increasing the area only by increasing the thickness of the printed circuit board. Power supply voltage and capacity can be increased. Since the thickness of the printed circuit board and the semiconductor chip are thin, the increase in thickness due to the combination is small.

The power supply voltage can be increased by wiring the power outputs of the insulated power supplies 48 to 50 in series, and the current capacity can be increased by wiring in parallel. Further, when the wiring between the outputs is not performed, a plurality of (three types in FIG. 5) independent power supplies can be formed. Since the current capacity can be increased by the parallel connection, the occupied area per stage can be reduced. The primary components of the power supply (current limiting resistor 43 and switching element 47) are mounted on the back of the assembled board.
The secondary components are mounted on the respective surfaces. These wirings also become patterns on the printed circuit board and external wirings 53.

FIG. 5 is a circuit diagram for explaining a third embodiment according to the present invention. In the third embodiment, the input is a pulse input by PWM (Pulse Width Modulation). As shown in FIG. 5, this includes a surface-emitting type light emitting diode or laser diode group 61, a photovoltaic element group (so-called solar cell) 62, a ripple removing capacitor 63, a smoothing diode 64, and a PWM switching element ( Transistor 65), an inductor 66, and a current regeneration diode 67.

The inductor 66 is for retaining energy.

In FIG. 5, the power generation principle is the same as in the first embodiment. However, the current limiting resistor 23 for limiting the input current of the first embodiment is omitted, and the input power V
Power is supplied to the laser diode group 61 by chopping in at a constant period by the switching element 65 and regenerating by the inductor 67 and the diode 68.
The supplied power is determined by the duty ratio of the rectangular wave signal for driving the switching element 65. The diode 64 prevents the voltage drop on the secondary side due to the current drop on the primary side, and the capacitor 63 reduces the pulsation of the output on the secondary side.

The specific mounting method in the third embodiment is exactly the same as the first embodiment (FIG. 2) and the second embodiment (FIG. 4).

In the first embodiment, most of the power supplied to the primary side is consumed by the current limiting resistor, resulting in poor efficiency. On the other hand, in the third embodiment shown in FIG. 5, when the switching element is turned on, the light emitting element power is supplied. However, even when the switching element 65 is turned off, the energy of the inductor 66 is transferred to the laser diode group via the diode 67. 61. If the duty ratio of the drive signal to the switching element 65 is increased, the output light quantity of the switching element 65 is increased, and the output obtained on the secondary side is also increased. The power consumed on the primary side is the switching element 6
5, only the small resistance components included in the regenerative diode 67 and the inductor 66 are consumed, and when the difference between the input voltage and the voltage between both ends of the laser diode group 61 is large, power efficiency is improved. However, since switching is performed, it is disadvantageous in terms of electromagnetic interference as compared with the first embodiment.

It should be noted that the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the gist of the invention. Furthermore, the above embodiments include inventions at various stages, and various inventions are extracted by appropriate combinations of a plurality of disclosed constituent features. For example, even if some components are deleted from all the components shown in the embodiments, at least one of the problems described in the problem to be solved by the invention is described.
In the case where one of them can be solved and the effect (at least one of the effects) described in the section of the effect of the invention is obtained, a configuration from which this component is deleted can be extracted as the invention.

[0043]

According to the present invention, it is possible to provide an insulated mounting module having the following functions and effects.

According to the first aspect of the present invention, a plurality of power generating pairs each composed of a light emitting element and a photovoltaic element are connected in series, and a plurality of power generating pair series circuits obtained thereby are connected in parallel. In addition, the power generation efficiency of the photovoltaic element is low, and the light output of the light emitting element is small, so that required power can be obtained.

According to the invention corresponding to claim 2, most of the necessary components are three-dimensionally mounted inside the printed circuit board.
The space required for this power supply can be significantly reduced.

According to the third aspect of the present invention, by combining the two-dimensionally configured power supply in the three-dimensional configuration with the configuration described in the first aspect, the area can be increased only by increasing the thickness of the printed circuit board. In this case, the thickness of the printed circuit board and the semiconductor chip are thin, so that the increase in the thickness due to the combination is small.

According to the invention corresponding to claim 4, the primary side input power supply in the power generation pair series circuit is switched by the pulse width modulation signal, and is regenerated by the circuit including the inductor and the diode. In addition, efficiency of power supply to the light emitting element can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an insulated mounting module according to a first embodiment of the present invention.

FIG. 2 is a view for explaining a mounting state in the embodiment of FIG. 1;

FIG. 3 is a circuit diagram of an insulated mounting module according to a second embodiment of the present invention.

FIG. 4 is a view for explaining a mounting state in the embodiment of FIG. 3;

FIG. 5 is a circuit diagram of an insulated mounting module according to a third embodiment of the present invention.

FIG. 6 is a circuit diagram for explaining an insulation regulator that is an example of a conventional insulation DC power supply.

[Description of Signs] 2 ... Power generation pair 21 ... Light emitting element 22 ... Photovoltaic element (so-called solar cell) 23 ... Current limiting resistor 24 ... Capacitor 25 ... Leakage current limiting diode 26 ... Switching device 31 ... First multilayer Printed circuit board 32 ... Second multilayer printed circuit board 33, 34 ... Depression 41 ... Surface emitting element 42 ... Photovoltaic element array (so-called solar cell) 43 ... Current limiting resistor 44, 45 ... Output stabilizing capacitor 46 ... Leakage current limiting Diode for use 47 ... Switching element 48, 49, 50 ... Insulated power supply 51 ... Multilayer printed circuit board 52 ... Wire bonding 53 ... Wiring 61 ... Surface emitting type light emitting diode or laser diode group 62 ... Photovoltaic element group (so-called solar cell) 63: Ripple removing capacitor 63 64: Smoothing diode 65: PWM Switching element (transistor, etc.) 66 ... inductor 67 ... current regeneration diode

Claims (4)

[Claims] 1. A plurality of power generation pairs each comprising a light emitting element and a photovoltaic element for obtaining electromotive force by inputting light from the light emitting element are mounted on the same substrate, and a plurality of power generation pairs are mounted on the same substrate. Characterized in that a plurality of pairs of power generation pairs are connected in series, and a plurality of pairs of power generation series circuits are connected in parallel. 2. A printed circuit board comprising a first and a second multilayer printed circuit board, wherein the first multilayer printed circuit board is formed with a recess for accommodating a plurality of light emitting elements constituting the power generation pair. The second multilayer printed board is formed with a recess for accommodating and mounting a plurality of photovoltaic elements constituting the power generation pair, and the first and second multilayer printed boards are opposed to each other. The insulated mounting module according to claim 1, wherein both are combined. 3. An insulated power supply comprises a surface-emitting element and a photovoltaic element array which receives light from the surface-emitting element to obtain an electromotive force and opposes each other. A plurality of power generation pairs are mounted on the same substrate, and a plurality of power generation pair series circuits are formed by connecting some of the power generation pairs in series, and the power generation pair series circuits are connected in parallel. Yes, three-dimensionally combine the respective insulated power supplies in a predetermined direction,
An isolated power supply module wherein the voltage, current capacity, and number of independent power supplies can be changed by external wiring. 4. A plurality of power generating pairs each having a light emitting element and a photovoltaic element for obtaining electromotive force by inputting light from the light emitting element are mounted on a same substrate, and , A plurality of sets of power generation pair series circuits formed by serially connecting some of the power generation pair series circuits, and the power generation pair series circuits are connected in parallel. An insulated power supply module configured to be switched by a pulse width modulation signal and regenerated by a circuit including an inductor and a diode.