KR20080097861A - Power supply having surge protection circuit - Google Patents

Abstract

A power supply having a surge protection circuit protects a connected circuit from surge by bypassing the surge to the ground and discharging the surge when the surge is inputted to an AC input terminal. A bypass unit(120) is electrically connected to an AC input terminal in parallel. The bypass unit bypasses the AC if the voltage level of the AC power supply is greater than a predetermined level. A discharge unit(130) is electrically connected between the bypass terminal and the ground of the bypass unit in series. The discharge unit discharges the AC power supply from the bypass terminal. The power supply is protected by discharging the surge after bypassing the surge if the surge is inputted though the AC input terminal.

Description

Power supply with surge protection circuit {POWER SUPPLY HAVING SURGE PROTECTION CIRCUIT}

1 is a block diagram of a power supply apparatus of the present invention.

Figure 2 (a) and (b) is an embodiment in which the power supply of the present invention is mounted on a substrate.

<Detailed Description of Major Symbols in Drawing>

100 ... Power supply unit 110 ... Overcurrent protection unit

111 ... first fuse 112 ... second fuse

120 ... Bypass section 121 ... First varistor

122 Second Varistor 130

131 ... first discharger 132 ... second discharger

140 Power supply 141 EMI removal unit

142 Rectifier ... 143 Power factor correction unit

144.Converter

The present invention relates to a power supply device, and more particularly, a power supply device having a surge protection circuit that effectively protects a product from a surge by discharging it when a surge voltage or a surge current is applied to the product through an AC power input terminal when the product is used. It is about.

Recently, PDP (Plasma Cisplay Panel) products have been in the spotlight as the size of display devices has increased. In these PDP products, a power supply unit for supplying power for operation is essential.

On the other hand, the power supply device adopted in the above-described PDP product is to convert the AC power into a predetermined DC power supply to supply to each circuit inside the PDP product, at this time, the surge due to lightning or switching of the power system to the AC power input terminal ( Surge) Voltage or surge current may be input, which can cause serious problems such as damage to electronic components inside the PDP product, fatal damage to electrical and electronic equipment, and malfunction of programs.

In order to solve the above problems, studies are being actively conducted on a surge protection circuit that protects internal components by blocking a surge input to a power supply device. As a result, most of the power supply devices are equipped with a surge absorber (Surge Absurber) at the AC power input terminal to form a protection circuit to protect the circuit in the event of a surge. However, the surge absorber is expensive compared to other passive devices, so There is a problem to raise.

In order to solve the above problems, an object of the present invention is to effectively discharge the surge voltage or surge current when the product is applied through the AC power input terminal when using the product to effectively protect the product from the surge and to provide a low-cost surge protection circuit It is to provide a power supply provided.

In order to achieve the above object, the power supply device of the present invention is a power supply device for converting AC power into a predetermined DC power, electrically connected in parallel to the input terminal of the AC power supply voltage level of the AC power in advance An AC power input terminal including a bypass unit for bypassing the AC power when the voltage level is higher than a predetermined voltage level, and a discharge unit electrically connected in series between the bypass terminal and the ground of the bypass unit to discharge AC power from the bypass terminal. When the surge power is applied through, the surge power is bypassed and then discharged to protect the power circuit.

According to an embodiment of the present disclosure, the bypass unit may include a first varistor connected in parallel with a live end of the AC power input terminal, and a second varistor connected in parallel with a neutral terminal among the AC power input terminals.

According to one embodiment of the invention, the discharge portion is a first discharger, one end is connected to the first varistor and the other end is connected to the ground and arc discharge of the AC power, and one end is connected to the second varistor and the other end to the ground It may be connected to include a second discharger for arc-discharging the AC power.

According to one embodiment of the present invention, an over-current protection unit having a plurality of fuses mounted between the first and second varistors of the bypass unit and the live and neutral terminals of the AC input terminal may be further included.

According to an embodiment of the present invention, the bypass unit and the discharge unit may be mounted on a patterned substrate, and the first discharger may be electrically connected to a first pattern electrically connected to the first varistor and the ground. And a second pattern spaced apart from the first pattern by a predetermined distance, wherein the second discharger is electrically connected to the ground and the third pattern electrically connected to the second varistor. And a fourth pattern spaced apart from each other by a preset distance.

According to an embodiment of the present invention, the ground may be a frame ground formed on the substrate and connected to a case covering the substrate.

According to the exemplary embodiment of the present invention, the first pattern and the second pattern of the first discharger may be spaced apart by 3.2 mm or more, and the third pattern and the fourth pattern of the second discharger may be spaced apart by 3.2 mm or more. Can be.

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

1 is a configuration diagram showing the configuration of the power supply apparatus of the present invention.

Referring to FIG. 1, the power supply device 100 of the present invention includes an overcurrent protection unit 110 connected in series to an AC power input terminal, a bypass unit 120 connected in parallel to the overcurrent protection unit 110, and a bypass unit. And a power supply unit 140 connected in series with the discharge unit 130 connected in series and the overcurrent protection unit 110.

The overcurrent protection unit 110 may include a plurality of fuses each connected in series to an AC power input terminal. That is, the overcurrent protection unit 110 may include a first fuse 111 connected in series to a live terminal of the AC power input terminal and a second fuse 112 connected in series to a neutral terminal of the AC power input terminal. have. The first and second fuses 111 and 112 are short-circuited if the current level of the AC power from the AC power input terminal is greater than or equal to a preset current level, thereby protecting a circuit connected thereafter from overcurrent.

The bypass unit 120 is connected in parallel to the overcurrent protection unit 110 to bypass the AC power to ground when the voltage level of the AC power from the AC power input terminal is higher than or equal to a preset voltage level. The bypass unit 120 includes a first varistor and a second varistor, respectively, and the first varistor 121 is connected in parallel to the first fuse 111 connected to the live terminal of the AC power input terminal and grounded (FG). ) Similarly, the second varistor 122 is connected in parallel to the second fuse 112 connected to the neutral terminal of the AC power input terminal and is connected to the ground F.G. In general, the varistor has an electrical characteristic in which the resistance value is sharply reduced when the voltage applied between the both ends is greater than or equal to a preset voltage. Accordingly, the voltage level of the first and second varistors 121 and 122 is increased. Bypass the AC power supply to ground if it is above a preset voltage level.

The discharge unit 130 is formed between the bypass unit 120 and the ground to arc discharge the AC power from the bypass unit 120. Accordingly, the discharge unit 130 may include the first discharger 131 connected between the first varistor 121 of the bypass unit 120 and the ground, and the second varistor 122 of the bypass unit 120. It may include a second discharger 132 connected between the ground.

The power supply unit 140 switches the AC power from the overcurrent protection unit 110 in a PWM (Pulse Width Modulation) method to convert the DC power into a predetermined DC power source.

Accordingly, the power supply unit 140 includes an electromagnetic interference removing unit 141 for removing electromagnetic interference (EMI) of AC power from the overcurrent protection unit 110, and an electromagnetic interference removing unit 141. AC power rectified part 142 for rectifying and smoothing AC power, power factor correcting part 143 for power factor correcting rectified and smoothed AC power from rectifying part 142, and power factor corrected power factor from power factor correcting part 143 It may include a conversion unit 144 for converting to a DC power source having a predetermined voltage level by switching to the PWM method.

2 (a) and 2 (b) show an embodiment in which the power supply device of the present invention is mounted on a substrate.

Referring to (a) and (b) of FIG. 2 together with FIG. 1, the overcurrent protection unit 110, the bypass unit 120, the discharge unit 130, and the components of the power supply device 100 of the present invention and The power supply unit 140 may be mounted on the substrate B.

Referring to FIG. 2A, an AC power input terminal C through which live and neutral of AC power is input is formed on the upper surface of the substrate B, and is serially connected to the live terminal L of the AC power input terminal C. A second fuse 112 connected in series to the neutral terminal N of the first fuse 111 connected to the AC power input terminal C is mounted. In addition, the first varistor 121 connected in parallel to the first fuse 111 and the second varistor 122 connected in parallel to the second fuse 112 are mounted on the upper surface of the substrate B. Subsequently, the power supply unit 140 is mounted.

Referring to FIG. 2B, first and second dischargers 131 and 132 are formed on the bottom surface of the substrate B, respectively. A pattern is provided on the bottom surface of the substrate B to provide an electrical path between the parts, and the first and second dischargers 131 and 132 may be formed in a pattern on the bottom surface of the substrate. .

In this case, the first discharger 131 may be formed of a first pattern 131a electrically connected to the first varistor 121 and a second pattern 131b connected to the ground FG, and the first pattern 131a. The second pattern 131b is spaced apart from each other by a predetermined distance to arc discharge the surge voltage from the first varistor 121.

To this end, the first pattern 131a and the second pattern 131b are formed in a sawtooth shape facing each other to facilitate arc discharge, and are spaced apart by 3.2 mm or more in accordance with US or European safety standards. Can be.

Similarly, the second discharger 132 may be formed of a third pattern 132a electrically connected to the second varistor 122 and a fourth pattern 132b connected to the ground FG, and the third pattern 132a. And the fourth pattern 132b may be spaced apart from each other by a predetermined distance to arc-discharge the surge voltage from the second varistor 122, and for this purpose, portions facing each other may be formed in a sawtooth shape, and also Figures may be spaced apart by more than 3.2 mm to comply with European safety standards.

In addition, the substrate may be combined with a metal case to be protected from external shock, environmental contamination, and the like. Accordingly, the ground (FG) is not only a ground formed in a pattern on the substrate, but also connected to the case to connect the case. It may be a frame ground that can be used as a ground. This allows for a stable operation of the circuit by creating a wider ground to provide an accurate reference potential.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, but is defined by the claims below, and the configuration of the present invention may be modified in various ways without departing from the technical spirit of the present invention. It will be apparent to those skilled in the art that the present invention may be changed and modified.

As described above, according to the present invention, when a surge is input through the AC power input terminal, it immediately bypasses and discharges to the ground, thereby protecting the circuit connected thereafter from a surge, and does not use an expensive surge absorption element. It is effective to reduce the unit price.

Claims (7)

In the power supply unit for converting AC power into a preset DC power, A bypass unit electrically connected to an input terminal of the AC power source and bypassing the AC power source when the voltage level of the AC power supply is higher than or equal to a preset voltage level; And A discharge section electrically connected in series between the bypass section of the bypass section and ground to discharge AC power from the bypass section When the surge power is applied through the AC power input terminal, including a power supply having a surge protection circuit characterized by bypassing and discharging the surge power to protect the power circuit. The method of claim 1, wherein the bypass unit A first varistor connected in parallel with a live stage of the AC power input terminal; And A second varistor connected in parallel with a neutral terminal among the AC power input terminals; Power supply having a surge protection circuit comprising a. The method of claim 2, wherein the discharge unit A first discharger having one end connected to the first varistor and the other end connected to the ground to arc discharge the AC power; And A second discharger connected at one end to a second varistor and connected at the other end to the ground to arc-discharge the AC power; Power supply having a surge protection circuit comprising a. The method of claim 2, And an overcurrent protection unit having a plurality of fuses mounted between the first and second varistors of the bypass unit and the live and neutral terminals of the AC input terminal, respectively. The method of claim 3, The bypass portion and the discharge portion are mounted on a patterned substrate, The first discharger includes a first pattern electrically connected to the first varistor and a second pattern electrically connected to the ground and spaced apart from the first pattern by a predetermined distance, The second discharge device includes a third pattern electrically connected to the second varistor and a fourth pattern electrically connected to the ground and spaced apart from the third pattern by a predetermined distance. Power supply. The method of claim 5, And the ground is a frame ground formed on the substrate and connected to a case covering the substrate. The method of claim 5, The first pattern and the second pattern of the first discharger are spaced at least 3.2mm from each other, And a third pattern and a fourth pattern of the second discharger are separated from each other by 3.2 mm or more.

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