KR19980086004A - Water supply unit power supply - Google Patents

Abstract

The present invention relates to a power supply device for a water distributor, comprising: filter means for removing noise components of an AC input power source, DC rectifying means for rectifying an AC input voltage from which noise components are removed by the filter means to a DC voltage; A resonator means for operating the driving element by a push-pull method, a DC output terminal for outputting a DC constant voltage at the secondary voltage induced by the switching transformer primary side by the operation of the driving element, and detecting an overcurrent and an overvoltage of the DC output terminal. It consists of overcurrent and overvoltage sensing means, and feedback means for detecting a change in AC input voltage and maintaining a constant output voltage of the DC output stage, and supplying a constant DC output voltage to the thermoelectric cooling element regardless of the change of the AC power supply voltage. By supplying a constant DC voltage, the efficiency of cold water function can be improved and stable circuit operation can be maintained.

Description

Water supply unit power supply

The present invention relates to a water distributor (e.g., cold and hot water purifier) that generates cold and hot water after purifying by removing harmful contaminants contained in raw water such as tap water. The present invention relates to a power supply device for a water distributor that supplies a DC output voltage.

In general, the water distributor removes harmful carcinogens contained in raw water such as tap water, and supplies purified water. The water distributor is largely divided into natural filtration, direct filtration, ion exchange resin, and reverse osmosis according to the water purification method. You can share it.

Among them, the reverse osmosis type applies pressure to raw water and passes water through a membrane (reverse osmosis filter), which is an artificial osmosis membrane, to purify the water. Since only the back can supply clean water, it is used for the cutting-edge science industry or for the cleaning of high-precision electronic components, or for medical purposes. Recently, it is also widely used in household water dispensers for drinking water.

As shown in FIGS. 1 to 4, the reverse osmosis water dispenser guides the introduction of external air into a predetermined position of the main body 200 at the same time, and at the same time, attaches a plurality of components on the upper surface thereof. The lower panel 210 is installed so that the front panel 220, the rear panel 230, and the side panel 250 are installed on each side of the lower panel 210 by a plurality of locking methods and fastening methods, respectively. The first and second support frames 260 and 270 are vertically installed at the same predetermined height, and the intermediate height of the main body 200 is between the first support frame 260 and the second support frame 270. The intermediate panel 280 is installed by a fastening method so as to form upper and lower spaces K and L of a predetermined area on the upper and lower sides, respectively.

In addition, the front panel 220 has a convex surface 221 integrally formed so that the control pad 290 is coupled to the upper side thereof, and the center of the lower side thereof is not shown by pressing force in close contact with the container. When the water intake switch is opened electronically and the passage is opened, and water (for example, cold water, hot water and purified water) is intake or the pressure is released, the water intake switch is turned off and the passage is closed to intake water. The water intake button 310 is installed to be resilient to be stopped, and at the bottom thereof, the water collecting container 320 is detachably installed to collect the remaining water flowing through the water intake hose 550 and to immediately drain it to the outside. .

In the upper space (K), the purified water container 330 is seated on the upper surface of the intermediate panel 280 to store a fixed amount of constant water in the center thereof, and is coupled in a screw manner, and the one side is contained in the raw water supplied. Filtration means 350 is installed to replace the filter fixing bracket 340 fastened and assembled to the second support frame 270 and the intermediate panel 280 to filter and filter various foreign matters. The hot water container 360 is provided on the upper surface of the intermediate panel 280 to receive the purified water stored in the purified water container 330 and to store the purified water at a predetermined capacity and to heat the purified water stored by the heating heat of an unillustrated heater housed therein. ) Is seated and screwed on.

The water purification container 330 is composed of a body 331 of a predetermined area with an upper portion opened, and a lid 332 for covering the upper opening of the body 331, the body 331 is the The through-hole 333 is formed so that the purified water filtered by the filtering means 350 is introduced into the body 331 or the water is discharged over a predetermined level inside the body 331, the body 331 at the front lower end The first outlet 334 is formed so that the purified water from the inside through the intake hose 550 to the outside, the purified water inside the body 331 at the lower end of the rear surface through the fourth connection hose 373 A second outlet 335 is formed to flow into the hot water tank 360, and a third outlet 336 is formed at the center of the bottom surface thereof so that the purified water inside the body 331 flows into the cold water tank described later.

The lid 332 is provided with a float sensor 380 in the vertical direction to detect the water level state of the purified water stored in the body 331 on one side thereof, the other side by the ultraviolet light on the other side ( 330) and the sterilization lamp 390 through the purified water container 330 in the vertical direction to suppress the secondary bacterial contamination of the purified water that has been left for a long time and at the same time as the secondary sterilization treatment of the purified water stored in the cold water container to be described later. It is installed to be inserted inside.

The filter fixing bracket 340 is bent in a L-shape when viewed from the front so that its upper end is screwed to the front and rear surfaces of the upper and lower ends of the second support frame 270, and the lower end is the intermediate panel 280. Screwed to one side of

The filtering means 350 is a sediment filter 351 is installed to be replaced on the bottom of the upper surface of the filter fixing bracket 340 to remove the suspended substances such as rust residues contained in the raw water when the raw water supplied from the tap water not shown is passed. And a pretreatment filter 352 installed through a filter fixing bracket 340 to remove various harmful organic compounds such as chlorine components contained in raw water passing through the precipitation filter 351, and the pretreatment filter 352. ) Is supplied to the pressure pump 400 installed on one side of the upper panel of the lower panel 210 and replaced on the bottom surface of the filter fixing bracket 340 to remove various heavy metals or carcinogens contained in the raw water when the pressurized raw water passes. Filter fixing bra to remove odorous components such as toxic gas contained in raw water when the membrane filter 353 and the raw water supplied from the membrane filter 353 are simultaneously passed. Post-processing filter 354 installed to be replaced on the bottom of the upper plate 340, and when the raw water supplied from the after-treatment filter 354 is passed through the sterilization of harmful bacteria contained in the raw water to be supplied to the purified water container 330 It consists of a sterilizing filter 355 installed on one side of the upper surface of the lower panel 210.

Meanwhile, the precipitation filter 351, the pretreatment filter 352, the membrane filter 353, the post treatment filter 354, the sterilization filter 355, and the cancer pump 400 are fifth connection hoses that guide the flow of raw water. Interconnected by 374.

In addition, as shown in FIG. 9, a water supply pipe 401 is connected to the lower side of the precipitation filter 351 so that raw water supplied from the tap water is supplied to the precipitation filter 351. The predetermined position of the flow sensor 380 is rotated by the raw water to detect the water pressure of the raw water supplied from the tap water to the water supply pipe 401, the lower one side of the membrane filter 353 passes through the inside Concentrated water pipe 410 is connected so that the generated concentrated water is discharged to the outside.

On the other hand, the upper side of the lower space (L) is supplied with the purified water stored in the purified water container 330 and stored in a predetermined capacity and at the same time cool the purified water stored by the electronic cooling method of the heat exchange means 490 installed on the lower portion The cold water tank 450 is attached to the center of the lower surface of the middle panel 280 in close contact with each other and screwed, and the lower side of the intermediate panel 280 is sterilized by the sterilization filter 355, the pressure pump 400, and the drainage. A switching means 460, a fan 472, and a transformer 480 are installed, and the fan 472 is configured to cool the heat radiated by the electronic cooling method of the heat exchange means 490 to release the fan to the outside. It is coupled to the shaft of the motor 471.

The outer side wall of the cold water tank 450 is provided with a switching mode power supply 500 (hereinafter referred to as SMPS), the outer side wall edge of the concentrated water quantity control valve 510 is installed, On the upper side, the thermistor 615 is received inside the cold water tank 450 and detects the cold water temperature.

In addition, the front of the intermediate panel 280, the purified water, cold water and on for controlling the water discharged to the outside from the purified water tank 330, the cold water tank 450, the hot water tank 360 according to the electronic signal The valve fixing bracket 281 is integrally bent and formed to be perpendicular to the vertical direction so that the intake intake valves 530, 531, and 532 are fixed. At one end of the intake valve 530, 531, 532, the cold water container 330 is provided. , The water intake hose 550 for collecting and discharging the water discharged from the hot water tank 360 to one place is connected.

As shown in FIG. 4, the heat exchange means 490 exhibits 'heat absorption' and 'heating' phenomena which appear at the contact portions of the thermoelectric circuits composed of two different n- and p-type thermoelectric semiconductor elements. First and second thermoelectrics installed under the outer surface of the cold water tank 450 to absorb heat from the purified water stored in the cold water tank 450 by using the electronic cooling method, and to dissipate heat as absorbed energy to cool the purified water. Cold water containers 450 contacting the first and second thermoelectric cooling elements 492 and 494 to widen the cross-sectional area for absorbing heat from the purified water stored in the cold water container 450 and the cooling elements 492 and 494 to facilitate heat exchange. Fastening screw 493 to increase the cooling efficiency by widening the cross-sectional area for dissipating the heat absorbed by the energy absorbed by the first and second thermoelectric cooling elements 492 and 494 and the cold sink 491 provided below the inner surface. Via the above It consists of a first and second thermoelectric cooling element (492 494) a heat sink (495) installed in the lower portion of the water jacket 450 is in contact with.

In addition, one side of the heat sink 495 may change the heat sink 495 when the first and second thermoelectric cooling elements 492 and 494 are cooled by the cold water tank 450 by the electronic cooling method. When the temperature is sensed and above a predetermined temperature (eg, about 60 ° C.), the power applied to the first and second thermoelectric cooling elements 492 and 494 is automatically cut off, thereby the first and second thermoelectric cooling elements 492 and 494. A thermostat 497 is attached to prevent overheating.

In the water distributor configured in this way, if the water level of the water purification tank 330 is below the low level, the water supply valve 641 is opened and raw water such as tap water starts to be supplied from the tap water.

As the water supply valve 641 is opened, the raw water supplied from the tap water passes through the precipitation filter 351 to remove suspended substances and debris, and the raw water passing through the precipitation filter 351 is a pretreatment filter 352. Various harmful organic compounds such as chlorine are removed while passing through.

The raw water passing through the pretreatment filter 352 is boosted to a predetermined pressure according to the driving of the pressure pump 400 to pass through the membrane filter 353. The raw water introduced into the membrane filter 353 is the membrane filter ( The various heavy metals contained in the raw water, the carcinogen, and the bacterium are removed while passing through a plurality of membrane membranes formed in 353).

The raw water passing through the membrane filter 353 passes through the post-treatment filter 354 to remove odors such as toxic gases, and the raw water passing through the post-treatment filter 354 passes through the sterilization filter 355 and deletes harmful bacteria. After sterilization, the water is supplied into the water purification tank 330 through the inlet hole 333 and then introduced into the hot water tank 360 and the cold water tank 450 through the second and third outlets 335 and 336.

At this time, the amount of purified water supplied into the purified water container 330 through the inflow hole 333, that is, the water level of the purified water container 330 is higher than the low water level, and detects the cold water temperature Tc of the cold water tank 450 in the thermistor 615. If the cold water temperature Tc is equal to or higher than the cold water reference temperature Tcs (hereinafter, referred to as a target temperature) of 8 ° C., the power control relays of the first and second thermoelectric cooling elements 492 and 494 are driven to output the output voltage of the SMPS 500. Since the first and second thermoelectric cooling elements 492 and 494 are applied to the first and second thermoelectric cooling elements 492 and 494, the first and second thermoelectric cooling elements 492 and 494 are turned on.

When a current is applied by applying power to the first and second thermoelectric cooling elements 492 and 494, 'heat absorption' and 'heating' phenomena appear on the contact portions of the first and second thermoelectric cooling elements 492 and 494, respectively. The cold sink 491 in contact with one side of the second thermoelectric cooling elements 492 and 494 desorbs and absorbs heat from the purified water stored in the cold water tank 450, and contacts the other sides of the first and second thermoelectric cooling elements 492 and 494. The heat sink 495 cools the purified water in the cold water tank 450 by dissipating heat as much as the absorbed energy. At this time, the fan 472 is rotated according to the driving of the fan motor 471 to radiate heat to the outside. Release to improve cooling efficiency.

At this time, the thermistor 615 detects the cold water temperature Tc of the cold water tank 450 lowered by the electronic cooling of the first and second thermoelectric cooling elements 492 and 494, and thus the cold water temperature Tc is the target temperature 3. If the temperature is lower than or equal to or lower than the low level, the power control relays of the first and second thermoelectric cooling elements 492 and 494 are driven to turn off the first and second thermoelectric cooling elements 492 and 494. At the same time, the fan 472 is also turned off with a predetermined delay time t1 (about 1 minute).

The predetermined delay time t1 is a heat dissipation time for preventing the temperature difference between the cold sink 491 and the heat sink 495 occurring when the first and second thermoelectric cooling elements 492 and 494 are turned off.

As such, the on / off driving of the first and second thermoelectric cooling elements 492 and 494 and the fan 472 is controlled according to the water level of the purified water tank 330 and the cold water temperature Tc of the cold water tank 450. The cold water temperature of 450) is maintained at the target temperature.

However, in such a conventional water distributor, since the DC output voltage of the SMPS 500 for supplying power to the first and second thermoelectric cooling elements 492 and 494 varies with the AC input power, the efficiency of the cold water function is improved. There is a problem that the SMPS (500) which is a DC power supply circuit is destroyed because there is no separate measures against overcurrent and overvoltage.

Therefore, the present invention has been made to solve the above problems, it is always supplying a constant DC output voltage regardless of the fluctuation of the AC power supply voltage to supply a constant DC voltage to the thermoelectric cooling element and the main circuit board of the cold water function It is an object of the present invention to provide a power distributor of a water distributor that increases efficiency and maintains stable circuit operation.

Another object of the present invention is to provide a power distributor of the water distributor that can prevent the circuit and operation because it detects and controls the over-current and over-voltage for the main circuit and the electric field driving voltage (DC voltage) supplied with the DC output voltage. It is.

In order to achieve the above object, the power supply apparatus of the water distributor according to the present invention includes a filter means for removing a noise component of an AC input power, and a DC for rectifying the AC input voltage from which the noise component is removed by the filter means to a DC voltage. A rectifying means, a resonating means for operating the driving element in a push-pull manner, a DC output stage for outputting a DC constant voltage at a secondary voltage induced at the switching transformer primary side by the operation of the driving means, and an overcurrent of the DC output stage. And an overcurrent and overvoltage detecting means for detecting an overvoltage, and feedback means for maintaining a constant output voltage of the DC output terminal by detecting a change in an AC input voltage.

1 is a perspective view showing a conventional water distributor,

Figure 2 is a perspective view showing the inside of the conventional water distributor,

3 is an exploded perspective view showing the inside of a conventional water distributor;

4 is a schematic longitudinal sectional view showing a conventional water distributor;

5 is a control block diagram of a power supply device of a water distributor according to an embodiment of the present invention;

6 is a detailed circuit diagram of a power supply device of a water distribution device according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: filter means 20: DC rectifying means

30: resonance means 31: control unit

40: DC output terminal 41: DC5V output terminal

43: DC12V output stage 45: DC24V output stage

50: overcurrent detection means 60: overvoltage detection means

70: feedback means

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

Since the basic configuration of the water distributor according to the present invention is the same as the conventional configuration shown in Figs. 1 to 4, redundant description is omitted.

5 is a circuit configuration diagram of a power supply device of a water distributor according to an embodiment of the present invention, and includes filter means 10 for removing line noise components of an AC input power and line noise by the filter means 10. DC rectifying means 20 for rectifying the filtered AC power source to DC voltage, resonating means 30 for operating the driving elements Q1 and Q2 (MOS FET) in a push-pull manner, and the driving elements Q1 and Q2. DC output stage 40 for outputting the DC constant voltage by the operation of the above, overcurrent sensing means 50 for detecting the overcurrent of the DC output stage 40, and overvoltage sensing means for sensing the overvoltage of the DC output terminal 40 And a pad back means 70 for keeping the output voltage of the DC output terminal 40 constant.

The filter means 10 includes a varistor VA for preventing a surge voltage generated when the AC input power is supplied, a resistor R1 for limiting the inrush current generated when the AC input power is supplied or cut off, and AC Coils FT1 and FT2 for canceling the high frequency and low frequency noise components of the input power supply, and capacitors C1 and C2 for supplying stable AC power by passing high impulse components of the AC input power to the ground line. have.

The DC rectifying means 20 filters the ripple component included in the bridge rectifier BD1 for full-wave rectifying the AC input power to a predetermined DC voltage and the DC voltage full-wave rectified by the bridge rectifier BD1. It consists of electrolytic capacitors C3 and C4 connected to the output terminal of the bridge rectifier BD1.

The resonator means 30 is a drive element (Q1, Q2) alternately operating in a push-pull method, a control unit 31 for controlling the drive element (Q1, Q2), and the control according to the control unit 31 A resonant transformer TN2 for inducing a voltage to operate the driving elements Q1 and Q2, and a power supply unit 33 for generating a voltage of the control unit 31. The power supply unit 33 includes the filter means ( 10) receives the AC input voltage from which the line noise component has been removed to the primary side, and decompresses the voltage to a predetermined low voltage to induce the secondary side, and the AC voltage reduced by the reduced pressure transformer TN3. Half-wave rectified diode D1, reverse voltage prevention diode D2, and electrolytic capacitor C5 are comprised.

The DC output terminal 40 is composed of a DC5V output terminal 41, a DC12V output terminal 43, and a DC24V output terminal 45. The DC5V output terminal 41 is induced by a voltage induced on the secondary side of the switching transformer TN1. Diodes D3 and D4 for rectifying the half-wave voltages into onion voltages, the incidence IM1 for preventing the voltage rectified by the diodes D3 and D4 from being affected by the current of the other output terminal, and the diode ( An electrolytic capacitor (C6) for filtering the noise component contained in the voltage rectified by the D3, D4), and a constant voltage device (REG) for receiving the voltage rectified by the diodes (D3, D4) and outputting a constant voltage of DC5V ) And an electrolytic capacitor C7 for filtering out noise components contained in the constant voltage of DC5V output from the constant voltage element REG.

The DV12V output terminal 43 is a diode D7, D8 for onion rectifying the voltage induced on the secondary side of the switching transformer 47, and the current of the output terminal different from the voltage rectified by the diodes D7, D8. And an electrolytic capacitor C10 to C12 for filtering the noise component contained in the voltage rectified by the diodes D7 and D8.

The DC24V output terminal 45 is boosted at the DC12V voltage of the DC12V output terminal 43, diodes D5 and D6 for onion rectifying the voltage induced on the secondary side of the switching transformer 47, and the diode D5. , The electrolytic capacitor for filtering the noise component contained in the voltage (IM2) and the rectified by the diodes (D5, D6) so that the voltage rectified by D6 is not affected by the current of the other output terminal. It consists of (C8, C9).

The overcurrent detecting means 50, if any one of the output terminal of the DC5V output terminal 41, the DC12V output terminal 43, and the DC24V output terminal 45 is greater than a set value, the control unit 31 in the resonance transformer (TN2-2) The over-current detecting means 50 detects the overcurrent of the DC5V output terminal 41, the DC12V output terminal 43, and the DC24V output terminal 45 so that the resonant frequency of the power supply is stopped to prevent the voltage of the DC output terminal 40 from being generated. ) Is a resistor (R22) for detecting a change in the amount of current of the DC5V output terminal 41, and the voltage received by the current flowing through the resistor (R2) generated through the resistor (R27) and at the same time the resistance ( A first comparator COM-1 for receiving and comparing the reference voltage set by R3 and R4, a resistor R5 for sensing a varying current amount of the DC12V output terminal 43, and a current flowing through the resistor R5; At the same time, the voltage received by the current is input through the resistor R29. A second comparator COM2 for receiving and comparing the reference voltages set by the terms R6 and R7, a resistor R8 for sensing a varying amount of current in the DV24V output terminal 45, and a current flowing through the resistor R8; The third voltage comparator COM3 receives the voltage generated by the current through the resistor R28 and receives the reference voltage set by the resistors R9, R10 and VR1 and compares them.

The overvoltage detecting means 60 stops the resonant frequency in the DC output terminal by detecting the resonance voltage of any one of the DC5V output terminal 41 and the DC12V output terminal 43 above a set value. By detecting the overvoltage of the DC5V output terminal 41 and the DC12V output terminal 43 so that the voltage of 40 is not generated, the overvoltage detecting means 60 divides a voltage dividing resistor for dividing the changing voltage of the DC5V output terminal 41. The voltage divided by the voltage divider resistors R13 and R14 and the voltage divider resistors R111 and R12 to the diode D9 and the resistor R15. The controller receives the voltage divided by the voltage dividing resistors R13 and R14 through the diode D10 and the resistor R15 and compares them with the reference voltages set by the resistors R16 and R17. A fourth comparator (COM4) that puts the 31 in shutdown mode. And a diode D11 that maintains the shutdown mode by continuously maintaining the output of the fourth comparator COM4 at a high level when the overcurrent and the overvoltage are sensed.

The overcurrent and overcurrent detecting means 50 and 60 protect the DC constant voltage circuit in case of abnormality of the main circuit and electrical equipment, and prevent overloading of other circuit parts, thereby supplying a stable DC voltage.

The padback means 70 resists the voltage of the DC12V output stage to adjust the on-time duty of the oscillation frequency in the control unit 31 when the AC input power is changed to maintain the output voltage of the DC output stage 40 constant. The voltage is divided by the R18 and VR2 and the resistors R19 and R20 to be connected to No. 3 of the controller 31.

Hereinafter, the effect of the power supply of the water distributor configured as described above will be described.

When the user inserts the power plug into the outlet and the main power is supplied to the power distributor of the water distributor, the high frequency and low frequency region noise components of the AC input power cancel each other by the coils FT1 and FT2 of the filter means 10. The high impulse component of the AC input power is passed to the ground line by the capacitors C1 and C2 to supply stable AC power.

The AC input power source from which the line noise component is removed by the filter means 10 is full-wave rectified by the bridge rectifier BD1 of the DC rectifying means 20 at a predetermined DC voltage. DC voltage of 220 * 1.414 = 311V, and the ripple component included in the DC voltage full-wave rectified by the bridge rectifier BD1 are filtered through the electrolytic capacitors C3 and C4.

At this time, the control unit 31 of the resonator means 30 operates the driving elements Q1 and Q2 in a push-pull manner at a resonant frequency of 32 KHz by the voltage induced by the resonant transformer TN2-2 (the driving elements Q1 and Q2 operates in reverse, Q2: OFF if Q1: ON)

Since the switching transformer 47 transmits the primary side voltage to the secondary side by the operation of the driving elements Q1 and Q2, DC5V, DC12V, and DC24V voltages are generated in the DC output terminal 40.

For each output stage, the DC5V output stage 41 rectifies the half-wave voltage from the diodes D3 and D4 to the onion voltage by the voltage induced on the secondary side of the switching transformer 47, and the diodes D3 and D4. The noise component included in the rectified voltage is filtered through the electrolytic capacitor C6, and the voltage filtered through the electrolytic capacitor C6 is of a predetermined level through the constant voltage device REG and the electrolytic capacitor C7. Converted to constant voltage, a constant voltage of DC5V is output.

The DC12V output terminal 43 rectifies the voltage induced on the secondary side of the switching transformer 47 into an onion voltage by the diodes D7 and D8 and is included in the voltage rectified by the diodes D7 and D8. The noise component is filtered through the electrolytic capacitors C10 to C12, and the voltage of DC12V is output. At the same time, the DC24V output terminal 45 receives the voltage induced on the secondary side of the switching transformer 47 by the diodes D5 and D6. The noise component included in the voltage rectified and rectified by the diodes D5 and D6 is filtered through electrolytic capacitors CD8 and C9 to output a voltage of DC24V boosted from the DC12V voltage of the DC12V output terminal 43. do.

At this time, the overcurrent sensing means 50 detects an overcurrent for the DC5V output terminal 41, the DC12V output terminal 43, and the DC24V output terminal 45, which is a resistor R2 at each of the DC output terminals 41, 43, and 45. The occurrence of the overcurrent is determined by using the voltage generated by the voltage flowing through the current flowing through R, R5 and R8.

Referring to each output stage, the overcurrent detection of the DC5V output stage 41 is a voltage comparable voltage generated by the current flowing through the resistor R2 in the DC5V output stage 41 through the resistor (R27) first comparator (COM1) At the point where the 11 terminal (+) terminal voltage is lower than the 10 terminal (-) voltage, compared to the 10 terminal voltage set by the resistors R3 and R4, The output (No. 13) terminal of the first comparator COM1 is inverted from high level to low level (normal: high level, over current detection: low level), so the voltage of terminal 6 (-) of the fourth comparator COM4 The voltage becomes lower than the seventh terminal voltage (+), and the output (number 1) terminal of the fourth comparator COM4 is inverted from the low level to the high level to make the controller 31 in the shotdown mode.

In addition, in the overcurrent detection of the DC12V output terminal 43, the voltage generated by the current flowing through the resistor R5 in the DC12V output terminal 43 is generated by the current of the second comparator COM2 through the resistor R29 (+). Comparator COM1 at the point where the 9th (+) terminal voltage is lower than the 8th (-) terminal voltage compared to the 8th terminal voltage set by the resistors R6 and R7. ) Output (No. 14) is inverted from high level to low level (normal: high level, over current detection: low level), so the voltage at terminal 6 (-) of the fourth comparator (COM4) is 7 (+). The terminal voltage is lower than the terminal voltage, and the output (No. 1) terminal of the fourth comparator COM4 is inverted from the low level to the high level, thereby putting the controller 31 in the shutdown mode.

At the same time, the overcurrent detection of the DC24V output terminal 45 is the voltage (4) of the third comparator COM3 through the resistor R28 is the voltage voltage generated by the current flowing through the resistor R8 in the DC24V output terminal 45 The third (+) terminal voltage is lower than the 5 (-) terminal voltage compared to the 5 (-) terminal voltage input to the + terminal and set by the resistors R9, R10, and VR1. The output (No. 2) terminal of the comparator COM3 is inverted from the high level to the low level (normal: high level, overcurrent detection: low level), so the voltage at terminal 6 (-) of the fourth comparator COM4 is 7 Since the voltage is lower than the + terminal voltage, the output (No. 1) terminal of the fourth comparator COM4 is inverted from the low level to the high level to make the controller 31 in the shutdown mode.

As such, when an overcurrent is detected in any one of the DC5V output terminal 41, the DC12V output terminal 43, and the DC24V output terminal 45, the control unit 31 stops the resonance frequency of the resonance transformer TN22-2. The voltage of the DC output terminal 40 is controlled not to be generated.

Simultaneously with the overcurrent sensing of each DC output stage 40 by the overcurrent sensing means 50, the overvoltage sensing means 60 senses the overvoltage of the DC5V output stage 41 and the DC12V output stage 43.

The overvoltage detection of the DC5V output terminal 41 is performed by the voltage dividing resistors R11 and R12 divided by the voltage dividing resistors R11 and R12 so that the voltage of the fourth comparator COM1 is increased by the diode D9 and the resistor R15. When the terminal 7 voltage is higher than the terminal 6 voltage compared to the reference voltage which is input to terminal (+) and set to terminal 6 by the resistors (R16, R17), the output ( Step 1) initially inverts from the low level to the high level to put the control unit 31 in the shot-down mode to cut off the supply of the DC output voltage.

The overvoltage detection of the DC12V output terminal 43 is performed by the voltage dividing resistors R13 and R14 divided by the voltage divider resistors R13 and R14 so that the voltage of the fourth comparator COM1 is increased by the diode D10 and the resistor R15. When the terminal 7 voltage is higher than the terminal 6 voltage compared to the reference voltage which is input to terminal (+) and set to terminal 6 by the resistors (R16, R17), the output ( Step 1) initially inverts from the low level to the high level to put the control unit 31 in the shutdown mode to cut off the supply of the DC output voltage.

In the overcurrent and overvoltage sense of the DC output terminal 40, the diode D11 maintains the output mode of the fourth comparator at a high level so that the power supply device maintains the shutdown mode unless the main power is turned off. Set the shutdown mode to work.

In addition, since the DC12V output terminal is the main output terminal in the DC output terminal 40, the divider voltages of the resistors R18 and VR2 and the resistors R19 and R20, which are the padback means 70, are connected to the third terminal of the controller 31. The controller 31 compares and analyzes the oscillation frequency (32KHz) by the sensed voltage and adjusts the oscillation frequency on time duty.

That is, when the AC input power is high based on AC220V, the output voltages (DC5V, DC12V, DC24V) of the DC output terminal 40 rise and the increased voltage is supplied to the terminal 31 of the controller 31 through the pad back means 70. When input, the control unit 31 compares and analyzes this to reduce the oscillation frequency on time duty, thereby keeping the output voltage of the DC output terminal 40 constant.

On the contrary, when the AC input power is low based on AC220V, when the output voltages (DC5V, DC12V, DC24V) of the DC output terminal 40 are lowered and the lowered voltage is input to the terminal 31 of the control unit 31 through the pad back means 70. The controller 31 compares and analyzes this to increase the oscillation frequency on-time duty, thereby keeping the output voltage of the DC output terminal 40 constant.

Therefore, this circuit supplies a constant DC voltage (12V) to the first and second thermoelectric cooling elements (492, 494) for making cold water in water purifier products, thereby improving the efficiency of the cold water function and supplying a constant DC voltage to the main control unit. In addition, stable circuit operation is possible regardless of AC input power fluctuation.

In addition, it detects and controls abnormality (overcurrent and overvoltage of the supplied DC output voltage) during circuit operation, thereby providing a DC constant voltage circuit containing an overcurrent and overvoltage detection circuit that prevents the risk of circuit operation and fire.

As described above, according to the power supply apparatus of the water distributor according to the present invention, cold water is supplied because the constant DC output voltage is always supplied to the thermoelectric cooling element and the main circuit board regardless of the AC power voltage variation. It improves the efficiency of functions, maintains stable circuit operation, and detects and controls overcurrent and overvoltage of main circuits and electric field driving voltages (DC voltage) supplied with DC output voltage, thereby preventing circuit and operation. have.

Claims (3)

Filter means for removing noise components of the AC input power source; DC rectifying means for rectifying the AC input voltage from which the noise component is removed by the filter means into a DC voltage; Resonator means for operating the drive element in the push-pull method, A DC output stage for outputting a DC constant voltage to a secondary voltage induced by the operation of the driving element at the primary side of the switching transformer; Overcurrent and overvoltage sensing means for sensing overcurrent and overvoltage of the DC output stage; And a feedback means for detecting a change in an AC input voltage and maintaining a constant output voltage of the DC output terminal. The method of claim 1, The resonator means includes a driving element operating in a push-pull method, a control unit for controlling the driving element, a resonant transformer for inducing a voltage to operate the driving element under control of the control unit, and creating a voltage of the control unit. Power supply device for water distributor, characterized in that consisting of a power supply. The method according to claim 1 or 2, The over-current and over-voltage detecting means detects a current change amount of the DC 5V output stage, a first comparator for comparing the voltage generated by the current flowing through the resistor with a set reference voltage, and a current change amount of the DC 12V output stage. And a second comparator for comparing the voltage generated by the current flowing through the resistor with a set reference voltage, a resistor for sensing the amount of change in the DC24V output terminal, and a current flowing through the resistor. A third comparator for comparing the generated voltage with a set reference voltage, a first voltage divider for dividing the changing voltage of the DC5V output terminal, a second voltage divider for dividing the changing voltage of the DC12V output terminal, and the first voltage divider; And a fourth comparator for comparing the voltage divided by the second voltage dividing resistor with a reference voltage to set the controller in a shutdown mode, and overcurrent and overvoltage detection. Power supply in the water dispenser, characterized in that it is composed of a diode for maintaining the output of the fourth comparator as a shot-down mode to maintain a high level.