KR20090131801A - Power supply for protecting microcomputer by surge voltage - Google Patents

Abstract

The present invention relates to a power supply for the protection of the microcomputer by the surge voltage, in particular, to separate the general components and the microcomputer among the components installed inside the device by blocking the surge generated around the device including the commercial power source and different power supply unit A printed circuit board in which a ground terminal of the microcomputer power supply unit supplying power to the microcomputer as well as supplying power to the microcomputer is directly connected to the ground terminal of the microcomputer without being in contact with the ground terminal of the general power supply unit; An iron case having an open rectangular shape and having an epoxy molding in a state in which the printed circuit board itself is received to block a noise signal flowing from the outside; A substrate having a plurality of gap keeping and terminal soldering holes and installed to block openings of the steel case; The small diameter soldering hole inserts are formed at both ends of the large rod-shaped body portion, and are vertically inserted between the power supply input / output terminals of the printed circuit board and the soldering holes of the board, and then soldered to the printed circuit board and the steel case. It consists of several interval maintaining and terminals between the ceiling surface and the printed circuit board and the board to maintain a constant distance from each other, as well as soldered and fixed to the main printed circuit board of the device in parallel with the function of the commercial power supply and DC voltage output terminal. It features.

Therefore, even if a surge voltage such as a lightning strike flows into the power supply, it is possible to prevent the microcomputer from operating abnormally, thereby improving reliability according to the operation of the device, and when insulating the power supply, a separate insulating plate, etc. Without using it, the bottom surface of the printed circuit board and the ceiling of the steel case can be kept in contact with each other without maintaining contact with each other, thereby improving workability as well as stabilizing the quality. In addition, the production cost of the product can be prevented in advance.

Description

A power supplying apparatus for protecting micoms from surge voltages}

The present invention relates to a power supply for the protection of the microcomputer by the surge voltage, and more particularly, in the construction of a power supply device used in various electrical and electronic devices and communication equipment, through the separation of the secondary winding of the transformer and the surge voltage It is formed by the microcomputer power supply which has the cut-off function, but the ground terminal of the microcomputer power supply can be connected through the microcomputer to prevent the microcomputer from abnormal operation due to lightning or surge voltage. The device itself is modularized by inserting it into the steel case, but the gap between the printed circuit board with the power supplies installed and the board blocking the opening of the steel case are installed to form the power supply device when molding the power supply device. The ceilings of the cases do not touch each other and are spaced apart In order to improve the workability and stabilization of the quality as well as maintaining the need to install a separate terminal does not invent a product that can significantly reduce the production cost itself.

In general, electrical and electronic devices, such as electrical devices or industrial machines that operate using electricity, have a withstand voltage that is a limit voltage that can withstand the applied voltage when the applied voltage is gradually increased. If an overvoltage exceeding this flows into a device, the devices and components connected to and built into the device will be damaged or the operation of the device will be disturbed.

As described above, a surge is introduced to a voltage applied to an electric device, an industrial machine, an electric electronic device, or a communication device to damage a device, a part, or the like, or to hinder the operation of the device.

These surges can be caused by natural lightning strikes or voltage imbalances in power systems or large industrial installations, causing them to enter the equipment through power lines, data communications lines and ground.

On the other hand, impulse or oscillatory waveforms with very high amplitudes such as lightning strikes, very fast rise times, and short duration times (0.5µs) are within 0.5 Hz. An electrical waveform that flows very quickly, overlaid on sinusoidal power and signals.

Since a method for blocking a surge such as a lightning strike is already known, a surge blocking circuit is generally added to a power supply terminal to block a surge flowing from a power supply terminal.

Such a surge blocking circuit may be composed of a coil, which is an inductive element, and a capacitor, which is a capacitive element, or may be blocked by a simple configuration, such as by using a varistor, a variable resistor, in which a fuse and a resistance value are changed.

Such a surge cut-off circuit is connected to an input of a power supply terminal and a varistor to block the surge of the voltage introduced from the power supply terminal. When an overvoltage of more than a predetermined standard flows in, the fuse is shorted by heat to be used as an electric device. To prevent ingress.

In the varistor, when the surge flows in, the resistance value decreases, thereby increasing the current to ground, thereby preventing the surge from flowing into the electric device.

On the other hand, the surge suppression circuit can be applied to many places, such as to the charger for interrupting the surge flowing into the antenna from the electrical equipment connected to the cable connected to the antenna, or to supply power to portable devices such as digital cameras, portable computers, etc. It can also be used to block incoming surges, and can also be used in power supplies that supply power.

However, the general power supply having such a surge blocking circuit can block the surge of the voltage introduced from the power terminal, but cannot control the input voltage, so it uses a different power voltage than the input voltage and is sensitive to the surge. This is a situation that is becoming a more serious problem in the electric and electronic devices with a microcomputer that works abnormally.

In addition, in order to protect the power supply from external noise, when molding, a separate insulating board is embedded for electrical insulation between the soldering part of the printed circuit board and the steel case, and the board which blocks the opening of the steel case; In order to maintain the gap of the printed circuit board, several gap retaining rods are fixed through screws and power input / output terminals are separately installed. Therefore, the workability of molding is not good and the production cost of the product is high due to the large number of parts used. There is also a problem such as rising.

The present invention has been made to solve the above-mentioned conventional problems, and when converting the primary rectified DC voltage back to AC voltage when constructing a power supply device used in various electronics and communication devices, such as primary The secondary winding of the transformer to be supplied to the winding is separated into two and formed into a general power supply for supplying power voltage to general components and a microcomputer power supply having a surge voltage blocking function, but the ground terminal of the microcomputer power supply is By adopting a method of connecting through a microcomputer without grounding like a power supply, it is possible to prevent the microcomputer from operating abnormally even when a surge voltage such as a lightning strike flows into the power supply, thereby improving reliability according to the operation of the device. The power supply itself is inserted into the steel case When installing the power supply by molding the power supply device by installing the terminals between the printed circuit board with the power supplies installed and the board blocking the opening of the steel case, the bottom surface of the printed circuit board and the steel are not used. The surges can not only improve the workability and stabilize the quality by maintaining a constant interval without touching the ceiling of the case, but also prevent the increase in production cost of the product by installing a terminal separately in addition to the interval holder. It is an object of the present invention to provide a power supply for protecting microcomputer by voltage.

The present invention for achieving the above object, the surge filter unit for blocking the surge flowing through the input terminal with a commercial voltage primarily, and the high AC voltage input in a state where the surge is blocked through the surge filter unit Rectifier for rectifying to low DC voltage, DC / AC converter for converting DC voltage output from the rectifier to AC voltage, and having two secondary windings and the AC voltage output from the DC / AC converter Transformer which separates and supplies power supply unit and microcomputer power supply unit. General power supply unit rectifies AC voltage induced by one of the secondary windings of the transformer and supplies it to the general component through the output terminal, and secondary of the transformer. Rectifies the AC voltage induced through the other winding among the windings and supplies it to the microcomputer through the output terminal. A microcomputer power supply, a surge blocking capacitor connected between one side of the primary winding of the transformer and a ground terminal of the microcomputer power supply to block a surge voltage from outside, and whether the output voltage of the microcomputer power supply is greater than or equal to a predetermined voltage. An overvoltage detector for detecting a voltage and a voltage transformer that stabilizes the voltage supplied to the microcomputer by automatically lowering an AC voltage applied to the primary winding of the transformer when the overvoltage detector determines that the output voltage of the microcomputer power supply A printed circuit board having an integrated primary winding voltage adjusting unit;

An iron case having an open rectangular shape and having an epoxy molding in a state in which the printed circuit board itself is received to block a noise signal flowing from the outside;

A substrate having a plurality of gap maintaining and terminal soldering holes and installed in a form of blocking an opening of the steel case;

The small diameter soldering hole inserts are formed at both ends of the large rod-shaped body portion, and are vertically inserted between the power supply input / output terminals of the printed circuit board and the soldering holes of the board, and then soldered to the printed circuit board and the steel case. It consists of several interval maintaining and terminals between the ceiling surface and the printed circuit board and the board to maintain a constant distance from each other, as well as soldered and fixed to the main printed circuit board of the device in parallel with the function of the commercial power supply and DC voltage output terminal. It features.

As described above, according to the present invention, when constructing a power supply device used in various electrical electronics and communication equipment, the transformer converts the primary rectified DC voltage back into an AC voltage and supplies it to the primary winding. The secondary winding is separated into two and formed into a general power supply unit for supplying power voltage to a general component and a microcomputer power supply unit having a surge voltage blocking function, and the ground terminal of the microcomputer power supply unit is not grounded like a general power supply unit. By adopting a method of connecting through a microcomputer instead of a microcomputer, it is possible to prevent the microcomputer from operating abnormally even when a surge voltage such as a lightning strike enters the power supply device, thereby improving reliability according to the operation of the device. Insert itself into steel case and modularize power supply The gap between the power input and output terminals of the printed circuit board and the terminal soldering hole of the board that blocks the opening of the steel case is provided so that the terminals are spaced and there is no need for a separate insulating board when molding the power supply device. Since the floor and the ceiling of the steel case can be kept in contact with each other without being in contact with each other, the workability can be improved and the quality can be stabilized. It is a very useful invention, such that the rise can be prevented beforehand.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows an exploded perspective view of the power supply device to which the present invention is applied, Figure 2 shows an assembled perspective view of the power supply device to which the present invention is applied, Figure 3 is a schematic longitudinal cross-sectional view of the power supply device to which the present invention is applied. 4 shows an electrical block diagram of the apparatus of the present invention.

Accordingly, the present invention, the surge filter unit 11 for blocking the surge flowing through the input terminals (AC1, AC2) with a commercial voltage primarily, and the surge is blocked through the surge filter unit 11 Rectifier 12 for rectifying the high AC voltage input from the low DC voltage, DC / AC converter 13 for converting the DC voltage output from the rectifier 12 to AC voltage, two secondary windings A transformer 14 having the L21 and the L22 and separating and supplying the AC voltage output from the DC / AC converter 13 to the general power supply 15 and the microcomputer power supply 16; The general power supply unit 15 rectifies the AC voltage induced by one winding L21 of the secondary windings L21 and L22 of 14) and supplies it to the general component through the output terminals DC1 + and DC1-. , Through the other winding (L22) of the secondary winding (L21) (L22) of the transformer (14) Rectifies the AC voltage and connects the microcomputer power supply unit 16 to supply the microcomputer through the output terminals (DC2 +, DC2-), one side of the primary winding of the transformer 14 and the ground terminal of the microcomputer power supply unit (16). Surge blocking capacitor 17 for secondary blocking the surge voltage introduced from the outside, an overvoltage detector 18 for detecting whether the output voltage of the microcomputer power supply 16 is greater than or equal to a predetermined voltage, and the overvoltage detector 18 In the case that it is determined that the output voltage of the microcomputer power supply unit 16 is greater than or equal to a certain voltage, the transformer primary winding which stabilizes the voltage supplied to the microcomputer by automatically lowering the AC voltage applied to the primary winding of the transformer 14. A printed circuit board 1 having a voltage automatic adjustment unit 19 integrally therewith;

A steel case (2) having an open rectangular shape and having an epoxy molding in a state where the printed circuit board (1) is housed in order to block a noise signal flowing from the outside;

A substrate (3) having a plurality of gap keeping and terminal soldering holes (31) and installed in such a way as to block an opening of the steel case (2);

A small diameter soldering hole inserting portion 42 is formed at both ends of the rod-shaped body 41 having a large diameter, and the power input / output terminals AC1, AC2 (DC1 +, DC1-) of the printed circuit board 1 are formed. Vertically inserted between (DC2 +, DC2-) and the soldering holes 31 of the substrate 3, and then soldered, between the printed circuit board 1 and the ceiling surface of the steel case 2 and the printed circuit board 1 ) And the board 3 to maintain a constant distance from each other, as well as soldering and fixed to the main printed circuit board of the device, several interval maintenance and terminal (4) functioning in parallel with the function of the commercial power supply and DC voltage output terminal; It is done.

At this time, the area of the substrate 3 is characterized in that it has an area that can be over the outside of the opening of the steel case (2).

Referring to the operation and effect of the power supply for the microcomputer protection by the surge voltage of the present invention configured as described above are as follows.

First, the present invention mainly consists of a printed circuit board (1), a steel case (2), a board (3), and several gap keeping and terminals (4) on which various power supply-related components are installed.

In this case, the printed circuit board 1 includes a surge filter 11, a rectifier 12, a DC / AC converter 13, a transformer 14, a general power supply 15, and a microcomputer power supply 16. And a surge suppression capacitor 17, an overvoltage detection unit 18, and a transformer primary winding voltage automatic adjustment unit 19 are integrally provided.

In the above, the surge filter unit 11 performs a function of primarily blocking surges, which are included in the commercial voltage applied through the input terminals AC1 and AC2, and the rectifier 12 is a surge filter unit ( 11) it performs the function of rectifying and smoothing the high AC voltage input in the state where the primary surge is cut off to the low DC voltage.

In addition, the DC / AC converter 13 converts the DC voltage output from the rectifier 12 into an AC voltage through oscillation, and supplies the DC voltage to the primary winding of the transformer 14, and the transformer 14 Induces the AC voltage output from the DC / AC converter 13 through the two secondary windings (L21) (L22) respectively to separate and supply to the general power supply unit 15 and the microcomputer power supply unit (16). Will be performed.

At this time, the secondary winding of the transformer 14 is separated into two, as well as one end of the secondary winding L22 connected to one side of the primary winding of the transformer 14 and the ground terminal of the microcomputer power supply unit 16. The AC voltage output from the DC / AC converter 13 is applied to the primary winding by providing a surge interruption capacitor 17 to block the surge voltage flowing from the outside for two times. When it is induced to the side, the AC voltage to be supplied to the general power supply unit 15 and the AC voltage to be supplied to the microcomputer power supply unit 16 are separated from each other, as well as the surge voltage introduced from the outside to the transformer 14. Even though it is introduced, the surge blocking capacitor 17 installed between the primary winding side of the transformer 14 and the ground terminal of the microcomputer power supply unit 16 blocks it, so that the power supply voltage supplied to the microcomputer Or more of the microcomputer operation, caused by the inlet magazine is full protection surge voltage is capable of preventing in advance.

In addition, the general power supply unit 15 rectifies the AC voltage induced in one of the windings (L21) of the secondary winding (L21) (L22) of the transformer 14 to the general configuration through the output terminals (DC1 +, DC1-). The microcomputer power supply 16 rectifies the AC voltage induced through the other winding L22 of the secondary windings L21 and L22 of the transformer 14 and outputs the output terminal. DC2 +, DC2-) will be supplied to the microcomputer.

In this case, the ground terminal of the microcomputer power supply unit 16 may be directly connected to the ground terminal of the microcomputer, not shown, like the general power supply unit 15 so that a surge voltage such as a lightning strike flows into the power supply device. Unlike the power supply unit 15, since it is directly connected to the microcomputer through the surge interruption and the long ground wire, the microcomputer does not flow into the microcomputer and is cut off and destroyed before the microcomputer can be prevented from operating abnormally. It can greatly improve the reliability.

In addition, the overvoltage detector 18 continuously detects the output voltage of the microcomputer power supply unit 16 and detects whether the voltage is equal to or greater than a predetermined voltage (ie, overvoltage) to the transformer primary winding voltage automatic control unit 19. The transformer primary winding voltage automatic control unit 19 that has received such an abnormal voltage automatically lowers an AC voltage applied to the primary winding of the transformer 14 in response to an overvoltage, thereby providing the microcomputer power supply. Since the voltage output from the supply unit 16 always maintains a constant voltage, the microcomputer operates stably.

On the other hand, when the printed circuit board (1) in which the circuits are installed is connected to the main printed circuit board (not shown) as it is, the power supply voltage may be unstable due to noise or various surges generated from the surroundings. The power supply device itself was molded by inserting (1) into a steel case 2 having a rectangular box shape having an open bottom, and then molding it with epoxy.

In this case, the opening of the steel case (2) is blocked through the substrate (3) having a plurality of interval maintaining and terminal soldering hole 31, the power input and output terminals (AC1, AC2) of the printed circuit board (1) Between the DC1 +, DC1- (DC2 +, DC2-) and the soldering holes 31 of the substrate 3, soldering hole inserts 42 having a small diameter are formed at both ends of the rod-shaped body portion 41 having a large diameter. By inserting and extending a plurality of the interval maintaining and terminal (4) formed vertically and fixed to each by soldering, the printed circuit including the printed circuit board 1 and the ceiling surface of the steel case (2) in which the above circuits are installed Since the distance between the substrate 1 and the substrate 3 is maintained at a predetermined interval as shown in FIG. 3, the bottom surface of the printed circuit board 1 and the steel case 2 may be used when molding the power supply without using an insulating board. ) 'S ceilings can be kept in constant contact with each other without Productivity and workability can be improved and quality can be stabilized.

In addition, when the power supply device of the present invention is installed on the main printed circuit board of the device, several interval maintaining and terminals 4 can be directly fixed by soldering, so that the printed circuit board 1 and the board 3 There is no need to install a separate spacing port, as well as the need for separate installation of a power supply terminal and an input / output terminal can significantly reduce the production cost itself of the product.

Although the above-described embodiments have been described with respect to the most preferred embodiments of the present invention, it is not limited to the above embodiments, and it will be apparent to those skilled in the art that various modifications can be made without departing from the technical spirit of the present invention.

1 is an exploded perspective view of a power supply device to which the present invention is applied.

Figure 2 is a perspective view of the assembled state of the power supply device to which the present invention is applied.

Figure 3 is a schematic longitudinal sectional view of the power supply device to which the present invention is applied.

Figure 4 is an electrical block diagram of the device of the present invention.

Explanation of symbols on the main parts of the drawings

1: printed circuit board 2: steel case

3: board | substrate 4: space | interval maintenance terminal

11: surge filter unit 12: rectifier unit

13 DC / AC converter 14: transformer

15: general power supply 16: microcomputer power supply

17: surge blocking capacitor 18: overvoltage detector

19: transformer primary winding voltage automatic control unit

31: spacing and terminal soldering hole

41 body portion 42 soldering hole insert

AC1, AC2: Input terminal DC1 +, DC1-, DC2 +, DC1-: Output terminal

L21, L22: secondary winding

Claims (3)

The microcomputer power supply unit that cuts off the surge generated in the vicinity of the device, including commercial power, separates general components and microcomputers from the components installed inside the device and supplies them through different power supplies. A printed circuit board in which a ground terminal is connected to a ground terminal of a microcomputer without directly contacting a ground terminal of a general power supply unit; An iron case having an open rectangular shape and having an epoxy molding in a state in which the printed circuit board itself is received to block a noise signal flowing from the outside; A substrate having a plurality of gap keeping and terminal soldering holes and installed to block openings of the steel case; The small diameter soldering hole inserts are formed at both ends of the large rod-shaped body portion, and are vertically inserted between the power supply input / output terminals of the printed circuit board and the soldering holes of the board, and then soldered to the printed circuit board and the steel case. It consists of several interval maintaining and terminals between the ceiling surface and the printed circuit board and the board to maintain a constant distance from each other, as well as soldered and fixed to the main printed circuit board of the device in parallel with the function of the commercial power supply and DC voltage output terminal. Power supply for micom protection by the surge voltage. The method according to claim 1, The printed circuit board, A surge filter unit which firstly blocks surges flowing through the input terminal together with the commercial voltage; A rectifier for rectifying the high AC voltage input while the surge is blocked through the surge filter to a low DC voltage; A DC / AC converter converting the DC voltage output from the rectifier into an AC voltage; A transformer having two secondary windings and separating and supplying an AC voltage output from the DC / AC converter into a general power supply unit and a microcomputer power supply unit; A general power supply unit for rectifying an AC voltage induced in one of the secondary windings of the transformer and supplying it to a general component through an output terminal; A microcomputer power supply unit rectifying the AC voltage induced through the other winding of the secondary winding of the transformer and supplying the microcomputer to the microcomputer through an output terminal; A surge blocking capacitor connected between one side of the primary winding of the transformer and a ground terminal of the microcomputer power supply unit to block secondary surge voltage from the outside; An overvoltage detector for detecting whether an output voltage of the microcomputer power supply unit is greater than or equal to a predetermined voltage; When the output voltage of the microcomputer power supply is determined to be greater than or equal to the predetermined voltage by the overvoltage detector, the transformer primary winding voltage automatic control unit automatically lowers the AC voltage applied to the primary winding of the transformer to stabilize the voltage supplied to the microcomputer. Power supply device for the protection of the microcomputer by the surge voltage, characterized in that provided integrally. The method according to claim 1, The width of the substrate is a power supply for micom protection by the surge voltage, characterized in that it has an area that can be covered over the outside of the opening of the steel case.

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