KR101635009B1 - SMPS circuit for water purifier - Google Patents

SMPS circuit for water purifier Download PDF

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Publication number
KR101635009B1
KR101635009B1 KR1020150154144A KR20150154144A KR101635009B1 KR 101635009 B1 KR101635009 B1 KR 101635009B1 KR 1020150154144 A KR1020150154144 A KR 1020150154144A KR 20150154144 A KR20150154144 A KR 20150154144A KR 101635009 B1 KR101635009 B1 KR 101635009B1
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South Korea
Prior art keywords
unit
power
driving
transformer
cold water
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KR1020150154144A
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Korean (ko)
Inventor
강현모
오학수
이현도
노국왕
김동우
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(주)토즈테크
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/285—Single converters with a plurality of output stages connected in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/18—Heating or cooling the filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The present invention relates to an SMPS circuit for a water purifier, which drives the water purifier by supplying driving power, and more specifically, to an SMPS circuit for a water purifier which provides cold water of high quality by enabling a cold water driving unit to control the strength of driving power applied to a thermoelectric element, and reduces manufacturing costs by using power induced in the transformer without using a separate regulator as the driving power of a PWM unit, and has a secondary auxiliary power supply unit to stably drive the cold water driving unit which is a variable load. According to the present invention, the SMPS circuit for a water purifier comprises: a hot water driving unit to apply driving power to a heater for hot water; a valve driving unit which includes a first transformer, a first switching device which switches input power to the first transformer, a first PWM unit to control switching of the first switching device, and a first smoothing unit to smooth the output power of the first transformer and to apply the driving power to a switch valve; a cold water driving unit which includes a second transformer, a second switching device to switch input power to the second transformer, a second PWM unit to control switching of the second switching device, and a second smoothing unit to smooth the output power to the second transformer and to apply the driving power to a thermoelectric element for cold water; and a CPU to control the strength of the driving power outputted by the cold water driving unit to keep the temperature of cold water uniform.

Description

SMPS circuit for water purifier {SMPS circuit for water purifier}

The present invention relates to an SMPS circuit for a water purifier that supplies driving power to a water purifier, and more particularly, to a water purifier for a water purifier that adjusts the intensity of driving power applied to a thermoelectric element to provide cool water of better quality, The present invention relates to an SMPS circuit for a water purifier having a secondary auxiliary power unit for reducing the manufacturing cost by using a power source induced in the transformer without using a separate regulator as a power source and stably driving the cold water driving unit as a variable load.

The water purifier is a device that removes foreign substances contained in raw water such as tap water (drinking water) and supplies purified water. There are natural filtration type, direct filtration type, ion exchange water type, and reverse osmosis type according to the purification method .

A cold / warm water purifier capable of adopting one of these various integer methods can usually supply hot water and cold water.

The water purifier uses the heater to heat the purified water in the hot water tank and cool the purified water in the cold water tank by using the cooler.

As a conventional technology related to a water purifier, Patent Document 10-0645107 entitled " Method and Apparatus for Temperature Control of Hot & Cold Water Purifier "and Patent Document 10-1146398 entitled " Cold Water Purifier and Control Method"

As a method of keeping the temperature of the cold water constant in the water purifier according to the related art, a method of setting a reference upper limit temperature and a method of setting a reference lower limit temperature and a reference upper limit temperature are used.

When the temperature of the cold water in the cooling tank becomes higher than the upper limit temperature, the cooler is stopped for a certain period by using the timer.

This method suffers from the problem that when the set time of the timer is long, the cold water is overcooled and unnecessary power is consumed. If the set time of the timer is short, the cold water is not cool and the cooler is frequently operated / stopped.

In the latter method, the cooler is started when the cold water temperature in the cooling tank becomes higher than the reference upper limit temperature, and the cooler is stopped when the cold water temperature is lower than the reference lower limit temperature.

It is preferable that the temperature of the cold water supplied by the water purifier is kept constant in order for the consumer to receive the high quality cold water. That is, the smaller the difference between the maximum temperature and the minimum temperature of the cold water provided by the water purifier, the more preferable.

When the difference between the reference lower limit temperature and the reference upper limit temperature is set to a large value, there is a problem that the cold water is supplied to the consumer at different temperatures depending on the use time. When the difference between the reference lower limit temperature and the reference upper limit temperature is set small, (High-quality cold water having a small temperature difference) can be provided. However, there is a problem that the cooler frequently operates / stops, shortening the lifespan of the cooler, and significantly increasing power consumption of the cooler and the like.

The present invention is conceived to solve the problems of the water purifier according to the prior art. The present invention has been made to solve the problems of the conventional water purifier, and it is an object of the present invention to provide a water purifier which is capable of providing cold water of a constant temperature, And it is an object of the present invention to provide an SMPS circuit for a water purifier that can be stably driven without using a separate regulator, thereby reducing manufacturing cost.

To this end, the SMPS circuit for a water purifier according to the present invention comprises:

A hot water drive unit for applying driving power to the hot water storage heater;

A first transformer, a first switching device for switching the input power to the first transformer, a first PWM device for controlling the switching of the first switching device, a second PWM device for smoothing the output power of the first transformer, A valve driving unit including a first smoothing unit for applying a first smoothing unit;

A second switching unit for switching the input power to the second transformer, a second PWM unit for controlling the switching of the second switching unit, a second PWM unit for smoothing the output power of the second transformer, A cold water driving unit including a second smoothing unit for applying power;

And a CPU for controlling the intensity of the driving power outputted from the cold water driving unit so that the temperature of the cold water is kept constant.

And a rectifying unit for rectifying external power and supplying the external power to the cold water driving unit and the valve driving unit, respectively,

The first PWM unit and the second PWM unit respectively use the output power of the rectifying unit as an initial start power,

The valve driving unit may further include a first auxiliary power unit for supplying driving power to the first PWM unit using a power source magnetically coupled to the first transformer,

Wherein the cold water driving unit includes a second auxiliary power unit for supplying driving power to the second PWM unit using a power source electri- cally coupled to the second transformer, And a secondary auxiliary power supply unit for supplying driving power to the second PWM unit using a power source induced in the auxiliary power unit,

The secondary auxiliary power unit

A diode D16 for rectifying the power output from the first auxiliary coil of the first auxiliary power unit,

A capacitor C51 for smoothing the power rectified by the diode D16,

A first transistor (Q4) turned on when the power supplied to the second auxiliary coil of the second auxiliary power unit is less than a reference value,

And a second transistor Q1 for turning on the first transistor Q4 when the first transistor Q4 is turned on so that the power of the capacitor C51 is applied to the second PWM unit.

And an electrostatic charge sensing unit for sensing a frequency of the external power source and whether the external power source is cut off by using a photocoupler,

And a capacitor for removing high frequency noise is connected to the light emitting element of the photocoupler in parallel.

The SMPS circuit for a water purifier according to the present invention configured as described above is provided with a cold water drive unit of a variable load that outputs a driving power of an intensity according to the temperature of cold water to provide the cold water of good quality,

In addition, a separate regulator is not used to supply the driving power to the second PWM section of the cold water drive section, and the manufacturing cost is lowered by using a power source induced in the transformer of the cold water drive section. The problem that the driving power becomes unstable due to the variable load, This is an SMPS circuit for a water purifier that is stabilized by using a power source induced in a transformer of a driving part, and is an extremely useful invention for industrial power generation.

1 is a schematic block diagram of an SMPS circuit for a water purifier according to the present invention;
2 is a circuit diagram of an electrostatic sensing unit in a SMPS circuit for a water purifier according to the present invention.
3A and 3B are circuit diagrams of a valve driving unit in a SMPS circuit for a water purifier according to the present invention.
4A and 4B are circuit diagrams of a cold water driving unit in an SMPS circuit for a water purifier according to the present invention.

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

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the numerals of the tens and the digits of the digits, the digits of the tens, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1, the SMPS circuit for a water purifier according to the present invention includes a hot water drive unit 1, a filter 2, a rectification unit 3, a valve drive unit 5, a cold water drive unit 6, a regulator 7, (8), a CPU (9), and the like.

The hot water driving unit 1 is provided in a hot water tank and applies driving power to a heater that heats the purified water stored in the hot water tank to become hot water. For reference, the heater generates heat by receiving a commercial power source as a driving power source.

The hot water driving unit 1 includes a current sensor 11 for preventing a driving power source (that is, a commercial power source including an overcurrent) from being applied to the heater when an external power source, that is, an AC commercial power source, And a switching element 13 for controlling the supply of driving power to the heater under the control of the CPU 9. The switching element may be a triac that receives a trigger signal (control signal) of the CPU 9 as a gate terminal and is turned on / turned on so that driving power is applied / cut off by the heater. Of course, transistors and thyristors can be used as switching elements in addition to triacs. A porter coupler (PC4) can be used as an electronic device for inputting a trigger signal to the gate terminal of the triac.

The filter 2 removes noise, surge, harmonics, and the like included in the external power source (i.e., commercial power source). The filter includes a fuse for blocking an overcurrent, a line filter for removing noise, a capacitor for removing harmonics, and a TNR for interrupting the surge voltage.

The rectifying unit (3) rectifies the external power having passed through the filter. A bridge diode (BD1) for full-wave rectifying an input AC power is used as the rectifying unit (3).

The valve driving unit 5 supplies driving power to a device such as an opening / closing valve provided in the water purifier and drives the valve.

The electrostatic detecting unit 8 senses whether or not external power is supplied, that is, whether the electronic apparatus is powered on and the frequency of the external power source, by using a photo coupler (PC8: A, PC8: B)

Referring to FIG. 2, the electrostatic charge sensing unit 8 includes a diode D81 for half-wave rectifying the input AC commercial power, a light emitting element of a photocoupler (PC8: A, PC8: B) Resistors R81, R82 and R83 for lowering the voltage of the PC 8: A and photocouplers PC8: A and PC8: B operated by the input AC commercial power source.

The photocouplers (PC8: A and PC8: B) include a light emitting device (PC8: A) for emitting commercial power and a light receiving device (PC8: B).

The capacitor C81 is connected in parallel to the light emitting device PC8 A to remove high frequency noise included in the commercial power supply to stably operate the light emitting device and the light receiving device PC8: And the resistor R84 and the capacitor C82 are connected in series and in parallel to each other to perform a stable operation.

When the commercial power is inputted, the light emitting element PC8: A flickers according to the frequency, and the light receiving element PC8: B receives the flickering signal of the light emitting element PC8: A and transmits it to the CPU 9 . If the flashing signal is not received from the light receiving element PC8 (B), the CPU 9 determines that the blackout is a blackout, and discriminates half of the frequency of the blinking signal (because D81 is half-wave rectified) as the frequency of the commercial power supply.

The water purifier supplies the purified water when the water level of the hot water tank and the cold water tank becomes low, the opening / closing valve that blocks the water supply when the water level becomes high, the lamp that indicates the operation of the heater and the thermoelectric element, Respectively. These are fixed loads that receive a constant voltage (or constant current) as the driving power.

Also, the thermoelectric element (Peltier) for cooling the purified water of the cold water tank is also a fixed load to which a constant voltage (or a constant current) is applied as a driving power source. However, in the present invention, It is a variable load which depends on it.

That is, in the present invention, when the water level is lowered in the cold water tank and the new water is supplied to increase the temperature of the cold water, the driving power of strong intensity is applied to the thermoelectric element so that the cold water of the cold water tank quickly reaches the set temperature, The temperature of the cold water is maintained at the predetermined temperature by reducing the intensity of the driving power to which the thermoelectric element is applied.

The present invention includes a valve driving unit 5 and a cold water driving unit 6 for supplying driving power to a fixed load such as an open / close valve and supplying driving power to a variable load to a thermoelectric element (Peltier) for cold water.

The valve driving unit 5 and the cold water driving unit 6 generate driving power by pulse width modulation (PWM) by switching.

As shown in FIGS. 3A and 3B, the valve-

A first transformer T1, a first switching device Q3 for switching an input power to the first transformer T1, a first PWM device U6 for controlling switching of the first switching device Q3, A first smoothing unit 51 for smoothing an output power of the first transformer T1 and applying a driving power to the first transformer T1 by using a power source electromagnetically coupled to the first transformer T1, A first auxiliary power supply unit 53 for supplying driving power to the first power unit U6 and a photocoupler PC2 A to A6 for sensing the secondary output power of the first transformer T1 and transmitting the power to the first PWM unit U6, PC2: B).

The first switching device Q3 switches the output power of the rectifying part 3 (BD1) to supply the switched power to the primary side of the transformer T1,

The first smoothing unit 51 converts the power output from the secondary side of the first transformer T1 into a voltage to be applied to elements such as a diode D11, capacitors C27 and C44, a coil L2 and a line filter LF2 And is converted into a direct current by smoothing and smoothing, and is made into a driving power source in which noises are removed,

The first PWM unit U6 receives the output voltage of the first transformer T1 sensed by the photocoupler PC2: A and PC2: B to control the switching of the first switching device Q3, And the portion 51 outputs a stable constant voltage as the driving power.

A direct drive power source is required as the first PWM unit U6. A separate regulator may be used to supply the driving power to the first PWM unit U6, but if a separate regulator is used, the manufacturing cost is greatly increased. Therefore, in the present invention, the first auxiliary power supply unit 53 generates and supplies driving power using a power source induced in the first transformer T1 without using a separate regulator.

The first PWM unit U6 can drive the first auxiliary power unit 53 so that the first PWM unit U6 outputs the output power B + of the rectifying unit 3 BD1 And is used as an initial start power source through the resistors R51 and R11 and is then driven by receiving driving power from the first sub power source unit 53. [

The first auxiliary power supply unit 53 includes a first auxiliary coil t1 that is magnetically coupled to the first transformer T1 and a second auxiliary coil t2 that rectifies and smoothens the power supplied from the auxiliary coil t1 And diodes D4 and D8 and a capacitor C9 for supplying the first PWM signal to the first PWM unit U6.

As shown in FIGS. 4A and 4B, the cold water-

A second transformer T2, a second switching device Q1 for switching the input power to the second transformer T2, a second PWM device U5 for controlling the switching of the second switching device Q1, A second smoothing unit 61 for smoothing the output power of the second transformer T2 and applying driving power to the thermoelectric element and a second smoothing unit 61 for smoothing the output power of the second PWM unit U5 A second auxiliary power supply unit 63 for supplying driving power to the first auxiliary power supply unit 53 when the output of the second auxiliary power supply unit 63 is low, (PC1: A, PC1: B) that senses the secondary output power of the second transformer T2 and transmits it to the second PWM unit U5; a cold water driving unit 6 And an intensity adjusting unit 67 for adjusting the intensity of the driving power outputted by the driving unit.

The second switching device Q2 switches the output power B + of the rectifying part 3 to supply the switched power to the primary side of the second transformer T2,

The second smoothing unit 61 converts the power outputted from the secondary side of the second transformer T2 into electric power by the diodes D9 and D10, the capacitors C14 and C15, the coil L1 and the line filter LF1 The device is rectified and smoothed using a device to convert it into a direct current, and a driving power source from which noises are removed is applied to an opening / closing valve,

The second PWM unit U5 receives the output voltage of the second transformer T2 sensed by the photocouplers PC3: A and PC3: B to control the switching of the second switching device Q2, And the portion 61 outputs a stable constant voltage as the driving power.

Also, the second PWM unit U5 does not use a separate regulator, and the second auxiliary power supply unit 63 generates and supplies driving power using a power source induced in the second transformer T2.

The second PWM unit U5 can drive the second auxiliary power unit 63 so that the second PWM unit U5 outputs the output power B + of the rectifying unit 3 (BD1) And is used as an initial start power source through the resistors R50 and R3 and is then driven by receiving driving power from the second sub power source unit 63. [

The second auxiliary power source unit 63 includes a second auxiliary coil t2 that is magnetically coupled to the second transformer T2 and a second power source that rectifies and smoothes the power source induced in the auxiliary coil t2 And diodes D3 and D7 and a capacitor C8 for supplying the second PWM signal to the second PWM unit U5.

In the cold water drive unit 6, the intensity of the driving power applied to the thermoelectric device varies depending on the temperature of the cold water. That is, the intensity of the power supplied to the second subcoil T2 of the second sub power unit 63 varies according to the temperature of the cold water, so that the power output from the second sub power unit 63 is supplied to the second PWM unit 63, There is a situation in which it is not enough to drive the U5.

The second auxiliary power supply unit 65 is driven to the second PWM unit U5 by using the power supply VCC-B induced in the first auxiliary coil t1 of the first auxiliary power supply unit 53, Supply power.

The secondary auxiliary power supply unit 65 includes a diode D16 for rectifying the power output from the first auxiliary coil of the first auxiliary power supply unit 53 and a capacitor for smoothing the power rectified by the diode D16, A first transistor Q4 turned on when the power supplied from the second auxiliary coil of the second sub power source 63 is lower than a reference value and a second transistor Q4 turned on when the first transistor Q4 is turned on, And a second transistor Q1 for applying power of the capacitor C51 to the second PWM unit U5.

The second PWM unit U5 is driven by using the output power B + of the rectifying unit 3 (BD1) as an initial start power in the initial stage when the external power is turned on and then the second power T2 is supplied with power The second auxiliary power supply unit 63 is driven by using the power generated by the power supplied to the second auxiliary coil t2 and the temperature of the cold water is lowered so that the intensity of the output power of the cold water drive unit 6 becomes weak The vehicle auxiliary power supply unit 65 is driven by using the power generated by the power supply VCC-B induced in the first auxiliary coil t1 of the valve driving unit 5. [

The intensity controller 67 controls the intensity of the driving power outputted from the cold water driving unit 6 under the control of the CPU 9. [

The intensity controller 67 includes a first comparator U9 (A) for receiving a reference voltage as a non-inverting terminal and receiving a control signal of the CPU 9 as an inverting terminal for comparison and a second comparator A second comparator U2: B for receiving and comparing the control signal of the CPU 9 to the inverting terminal and for comparing the output of the first comparator U9: A and the second comparator U2: And a photocoupler (PC3: A, PC3: B) for transmitting the signals to the 2PWM unit U5.

When the control signal of the CPU 9 inputted to the inverting terminal is smaller than the reference voltage inputted to the non-inverting terminal, the first comparator U9: A outputs the photocoupler (PC3: A.PC3: B) (U5) to prevent the cold water drive unit 6 from outputting driving power. The off signal of the second PWM unit U5 is a case where the cold water is overcooled, a command signal according to the user's operation is inputted, and the like.

The second comparator U2: B outputs a voltage having an intensity proportional to the difference between the two voltages input to the inverting terminal and the non-inverting terminal to the photocoupler (PC3: A, PC3: B) (U5) outputs the driving power of the intensity corresponding thereto.

When the inverting terminal of the second comparator U2: B receives a voltage of a certain range (for example, 0V to 2.5V) from the CPU 9 as a control signal, a second comparator A resistor R1 is connected to the inverting terminal of U2: B.

More specifically, if there is no control signal input to the inverting terminal of the second comparator U2 (B) (that is, when 0 V is input), it is recognized as an OPEN state (the resistance (impedance) of the inverting terminal is recognized as 0 A capacitor C3 is connected to the first comparator U2 so that the control signal input to the inverting terminal is transmitted to the second comparator U2: B, The charging voltage is quickly changed and reacted through the resistor R1 so that the control signal of the CPU 9 is quickly transmitted.

The regulator generates a constant voltage by stepping down the output power of the first smoothing unit 51 and supplies driving power to the CPU 9 or the like.

While the present invention has been described in connection with the preferred embodiments thereof with reference to the accompanying drawings, it is to be understood that the invention is not limited to the disclosed embodiments, Should be interpreted as belonging to.

1: hot water driving part 3: rectifying part
5: valve driving part 6: cold water driving part

Claims (4)

A hot water drive unit for applying driving power to the hot water storage heater;
A first transformer, a first switching device for switching the input power to the first transformer, a first PWM device for controlling the switching of the first switching device, a second PWM device for smoothing the output power of the first transformer, A valve driving unit including a first smoothing unit for applying a first smoothing unit;
A second switching unit for switching the input power to the second transformer, a second PWM unit for controlling the switching of the second switching unit, a second PWM unit for smoothing the output power of the second transformer, A cold water driving unit including a second smoothing unit for applying power;
A CPU for controlling the intensity of the driving power outputted from the cold water driving unit so that the temperature of the cold water is kept constant;
And a rectifying unit for rectifying external power and supplying the external power to the cold water driving unit and the valve driving unit,
The first PWM unit and the second PWM unit respectively use the output power of the rectifying unit as an initial start power,
The valve driving unit may further include a first auxiliary power unit for supplying driving power to the first PWM unit using a power source magnetically coupled to the first transformer,
Wherein the cold water driving unit includes a second auxiliary power unit for supplying driving power to the second PWM unit using a power source electri- cally coupled to the second transformer, Further comprising a secondary auxiliary power unit for supplying driving power to the second PWM unit using a power source induced in the auxiliary power unit. delete The method according to claim 1,
The secondary auxiliary power unit
A diode D16 for rectifying the power output from the first auxiliary coil of the first auxiliary power unit,
A capacitor C51 for smoothing the power rectified by the diode D16,
A first transistor (Q4) turned on when the power supplied to the second auxiliary coil of the second auxiliary power unit is less than a reference value,
And a second transistor (Q1) for turning on the first transistor (Q4) when the first transistor (Q4) is turned on so that the power of the capacitor (C51) is applied to the second PWM unit. The method of claim 3,
And an electrostatic charge sensing unit for sensing a frequency of the external power source and whether the external power source is cut off by using a photocoupler,
And a capacitor for removing high frequency noise is connected in parallel to the light emitting element of the photocoupler.
KR1020150154144A 2015-11-03 2015-11-03 SMPS circuit for water purifier KR101635009B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980086004A (en) * 1997-05-30 1998-12-05 윤종용 Water supply unit power supply
KR20000008739A (en) * 1998-07-15 2000-02-15 배동만 Switching type power supply unit
JP2000188865A (en) * 1998-12-24 2000-07-04 Nec Home Electronics Ltd Power supply device
KR20150000754A (en) * 2013-06-25 2015-01-05 엘지전자 주식회사 A switching mode power supply driving thermoelectric module and water purifier including the switching mode power supply

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980086004A (en) * 1997-05-30 1998-12-05 윤종용 Water supply unit power supply
KR20000008739A (en) * 1998-07-15 2000-02-15 배동만 Switching type power supply unit
JP2000188865A (en) * 1998-12-24 2000-07-04 Nec Home Electronics Ltd Power supply device
KR20150000754A (en) * 2013-06-25 2015-01-05 엘지전자 주식회사 A switching mode power supply driving thermoelectric module and water purifier including the switching mode power supply

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