KR970005552B1 - Driving control circuit for multi-pump - Google Patents

Driving control circuit for multi-pump Download PDF

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Publication number
KR970005552B1
KR970005552B1 KR1019940024318A KR19940024318A KR970005552B1 KR 970005552 B1 KR970005552 B1 KR 970005552B1 KR 1019940024318 A KR1019940024318 A KR 1019940024318A KR 19940024318 A KR19940024318 A KR 19940024318A KR 970005552 B1 KR970005552 B1 KR 970005552B1
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KR
South Korea
Prior art keywords
pump
signal
output
driving
control circuit
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KR1019940024318A
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Korean (ko)
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KR960011598A (en
Inventor
허태석
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엘지전자 주식회사
이헌조
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Publication of KR960011598A publication Critical patent/KR960011598A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0215—Electrical pumps

Abstract

A driving control circuit for a multi-pump automatically switches a driving signal to another pump when a malfunction occurs to a pump receiving a driving signal. The driving control circuit for a multi-pump includes: switching elements for switching a common AC power provided to the first and second pumps; first and second drivers for selectively driving the switching elements according to a provided control signal; first and second current detectors for detecting a current provided to each pump according to an operation of the switching element; and a multi-pump driving determining part for enabling the first and second drivers according to an output current level from the first and second current detectors.

Description

멀티펌프의 구동제어회로Multi-pump drive control circuit

제1도는 선행기술에 의한 펌프 구동제어회로의 실시예시도.1 is an exemplary view of a pump drive control circuit according to the prior art.

제2도는 본 발명에 따른 멀티펌프의 구동제어회로도.2 is a drive control circuit diagram of a multipump according to the present invention.

제3도는 제2도에 도시된 멀티펌프 구동제어회로의 일부 상세도.3 is a partial detailed view of the multipump drive control circuit shown in FIG.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 정류부 2 : 리세트부1: rectification part 2: reset part

3 : 교호운전 구동신호 발생부 4 : 제1비교부3: Alternating operation drive signal generator 4: First comparison unit

5 : 우선신호 발생부 6 : 제2비교부5: priority signal generator 6: second comparison unit

7 : 제1구동부 8 : 제2구동부7: first driving unit 8: second driving unit

10 : 제1전류검출부 15 : 제2전류검출부10: first current detector 15: second current detector

20 : 멀티펌프 구동결정부 P1,P2 : 펌프20: Multipump drive determining unit P1, P2: Pump

본 발명은 적어도 2개 이상의 펌프를 선택적으로 구동하는 멀티펌프의 구동제어회로에 관한 것으로서, 보다 상세하게는 구동신호가 공급된 펌프가 고장일 때 자동으로 다른 펌프로 구동신호가 절환되는 멀티펌프의 구동제어회로에 관한 것이다.The present invention relates to a drive control circuit of a multipump that selectively drives at least two or more pumps, and more particularly, to a multipump in which a drive signal is automatically switched to another pump when a pump supplied with a drive signal fails. It relates to a drive control circuit.

선행기술에 의한 펌프구동 제어회로의 실시예는 제1도에 도시된 바와 같이 압력스위치(S1)의 작동상태에 따라 정류부(1)를 통과하는 상용교류전원에 의해 구동신호를 발생하는 교호운전 구동신호 발생부(3)와, 상기 교호운전 구동신호 발생부(3)에 접속되어 리세트 신호를 공급하는 리세트부(2)와, 상기 교호운전 구동신호 발생부(3)에서 출력된 구동신호와 압력스위치(S1)의 작동에 따라 출력되는 신호(DC 전압)을 비교하는 제1비교부(4)와, 상기 정류부(1)의 출력단에 접속된 압력스위치(S2)의 작동에 따라 우선구동신호를 발생하는 우선신호 발생부(5)의 출력과 제1비교부(4)의 출력을 입력으로 하여 비교하는 제2비교부(6)와, 상기 제2비교부(6)에서 출력되는 2개의 제어신호에 따라 각각 구동되어 제1, 2펌프(P1)(P2)에 공급되는 상용교류전원(AC)을 스위칭하는 스위칭소자(T1)(T2)의 작동을 제어하는 제1, 2구동부(7)(8)로 구성되어 있다.In the embodiment of the pump drive control circuit according to the prior art drive alternate driving operation to generate a drive signal by the commercial AC power supply passing through the rectifier 1 in accordance with the operating state of the pressure switch (S1) as shown in FIG. A drive signal output from the alternating drive signal generator 3 and a reset unit 2 connected to the signal generator 3, the alternating drive signal generator 3 to supply a reset signal; And the first comparator 4 for comparing the signal (DC voltage) output according to the operation of the pressure switch S1 and the pressure switch S2 connected to the output terminal of the rectifying unit 1, prior to driving. A second comparator 6 for comparing the output of the priority signal generator 5 for generating a signal with the output of the first comparator 4 as an input, and 2 output from the second comparator 6; Switches for switching the commercial AC power supplied to the first and second pumps P1 and P2 respectively according to the two control signals. First, that controls the operation of the generic element (T1) (T2) consists of a drive unit 2 (7) (8).

상기와 같이 구성된 펌프구동제어회로는 압력스위치(S1)(S2)의 작동에 따라 제2비교부(6)에서 출력되는 2개의 제어신호중 어느 하나가 선택되어 제1구동부(7)나 제2구동부(8)를 구동시켜 스위칭소자(T1)(T2)를 작동하므로 선택된 펌프(P1)(P2)만 교호운전 구동신호발생부(3)에서 출력되는 신호에 의해 기동된다.In the pump driving control circuit configured as described above, any one of two control signals output from the second comparing unit 6 is selected according to the operation of the pressure switches S1 and S2, so that the first driving unit 7 or the second driving unit is selected. Since the switching elements T1 and T2 are operated by driving (8), only the selected pumps P1 and P2 are activated by a signal output from the alternate driving drive signal generator 3.

이와같이 작동하는 펌프구동제어회로에서는 선택된 펌프가 고장일 경우 구동제어신호가 다른 펌프로 자동으로 절환되지 않으므로 펌프를 운전해야 할 시점에서 운전하지 못하는 문제가 발생하는 경우가 있었다.In the pump drive control circuit operating as described above, when the selected pump fails, the drive control signal is not automatically switched to another pump.

따라서, 본 발명은 상기와 같은 제반결점을 해소하기 위하여 창출한 것으로서, 본 발명의 목적은 적어도 2개의 이상의 펌프를 선택적으로 구동할 때 구동신호가 공급된 펌프가 고장일 경우 자동으로 선택되지 않은 펌프로 구동신호가 절환되어 펌프를 기동시키는 멀티펌프의 구동제어회로를 제공하는데 있다.Therefore, the present invention has been created to solve the above-mentioned shortcomings, and an object of the present invention is a pump that is not automatically selected when a pump supplied with a drive signal fails when selectively driving at least two or more pumps. The present invention provides a drive control circuit for a multipump which switches a furnace driving signal to start a pump.

상기의 목적을 달성하기 위하여 본 발명에 따른 멀티펌프의 구동제어회로는, 제1, 2펌프에 공급되는 상용교류전원을 각각 스위칭하는 스위칭소자와, 상기 스위칭소자들을 공급된 제어신호에 따라 선택적으로 구동하는 제1, 2구동부와, 상기 스위칭소자의 작동에 따라 각 펌프에 공급되는 전류를 검출하는 제1, 2전류검출부와, 상기 제1, 2전류검출부에서 출력되는 전류레벨에 따라 제1, 2구동부를 인에이블시키는 멀티펌프 구동결정부로 구성된 것을 특징으로 한다.In order to achieve the above object, the driving control circuit of the multipump according to the present invention may include: a switching element for switching commercial AC power supplied to the first and second pumps, and the switching elements selectively according to the supplied control signal. First and second driving units for driving, First and second current detection unit for detecting the current supplied to each pump in accordance with the operation of the switching element, and First and second according to the current level output from the first and second current detection unit It is characterized by consisting of a multi-pump drive determination unit for enabling the two drive unit.

이하, 예시된 도면을 참조하여 본 발명을 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to the illustrated drawings.

제2도는 본 발명에 따른 멀티펌프의 구동제어회로이고, 제3도는 제2도에 도시된 멀티펌프 구동결정부(20)의 상세 회로도이다.2 is a drive control circuit of the multipump according to the present invention, and FIG. 3 is a detailed circuit diagram of the multipump drive determination unit 20 shown in FIG.

제2도에 도시된 멀티펌프의 구동제어회로는, 압력스위치(S1)의 작동상태에 따라 정류부(1)를 통과하는 상용교류전원에 의해 구동신호를 발생하는 교호운전 구동신호 발생부(3)와, 상기 교호운전 구동신호 발생부(3)에 접속되어 리세트 신호를 공급하는 리세트부(2)와, 상기 교호운전 구동신호 발생부(3)에서 출력된 구동신호와 압력스위치(S1)의 작동에 따라 출력되는 신호(DC전압)를 비교하는 제1비교부(4)와, 상기 정류부(1)의 출력단에 접속된 압력스위치(2)의 작동에 따라 우선구동신호를 발생하는 우선신호 발생부(5)의 출력과 제1비교부(4)의 출력을 입력으로 하여 비교하는 제2비교부(6)와, 상기 제2비교부(6)에서 출력되는 제어신호와 후술하는 제1, 2전류검출부(10)(15)에서 출력되는 전류레벨에 따라 제1, 2펌프(P1)(P2)에 공급되는 상용교류전원(AC)을 스위칭하는 스위칭소자(T1)(T2)를 구동하는 제1, 2구동부(7)(8)에 소정의 제어신호를 공급하는 멀티펌프 구동결정부(20)와, 상기 스위칭소자(T1)(T2)와 펌프(P1)(P2) 사이에 전류검출용 트랜스포머를 접속하여 된 제1, 2전류검출부(10)(15)로 구성되어 있다.The drive control circuit of the multipump shown in FIG. 2 has an alternate driving drive signal generator 3 generating a drive signal by a commercial AC power supply passing through the rectifying unit 1 according to the operating state of the pressure switch S1. And a reset unit 2 connected to the alternating operation drive signal generation unit 3 and supplying a reset signal, and a drive signal and a pressure switch S1 output from the alternating operation drive signal generation unit 3. Priority signal for generating a priority drive signal according to the operation of the first comparison unit (4) for comparing the output signal (DC voltage) and the pressure switch (2) connected to the output terminal of the rectifier (1) The second comparator 6 comparing the output of the generator 5 and the output of the first comparator 4 as inputs, the control signal output from the second comparator 6 and the first to be described later. Switching the commercial AC power supplied to the first and second pumps P1 and P2 according to the current level output from the second current detectors 10 and 15. Is a multipump drive determination section 20 for supplying a predetermined control signal to the first and second drives 7 and 8 for driving the switching elements T1 and T2, and the switching elements T1 and T2. And the first and second current detection units 10 and 15 connected by a current detection transformer between the pump P1 and P2.

한편, 제3도는 멀티펌프 구동결정부(20)의 상세회로도로서, 제1, 2전류검출부(10)(15)의 트랜스포머 2차측 코일에 유기된 전류를 정류하는 정류회로(BD1)(BD2)와, 상기 정류회로(BD1)(BD2)에서 출력된 전압과 설정된 기준전압(Vref1)(Vref2)을 비교하여 펌프의 구동신호와 고장신호에 해당된 하이 또는 로우 전압을 출력하는 비교기(OP1)(OP2)와, 상기 비교기(OP1)의 출력과 제1펌프구동신호(PS1)를 논리곱하는 앤드게이트(AND1)와, 상기 비교기(OP2)의 출력과 제2펌프구동신호(PS2)를 논리곱하는 앤드게이트(AND2)와, 상기 앤드게이트(AND2)의 출력과 제1펌프구동신호(PS1)를 논리합하여 제1구동부(7)에 소정의 제어신호를 공급하는 오아게이트(OR1)와, 상기 앤드게이트(AND1)의 출력과 제2펌프 구동신호(PS2)를 논리합하여 제2구동부(8)에 소정의 제어신호를 공급하는 오아게이트(OR2)로 구성되어 있다.3 is a detailed circuit diagram of the multi-pump drive determination unit 20. Rectification circuits BD1 and BD2 rectify the current induced in the transformer secondary coils of the first and second current detection units 10 and 15. FIG. And a comparator (OP1) for comparing the voltage output from the rectifier circuit (BD1) (BD2) and the set reference voltage (V ref1 ) (V ref2 ) to output a high or low voltage corresponding to the driving signal and the fault signal of the pump. ) OP2, an AND gate AND1 that logically multiplies the output of the comparator OP1 and the first pump driving signal PS1, and the output of the comparator OP2 and the second pump driving signal PS2. An OR gate AND1 for multiplying the AND gate AND2 multiplied with the output of the AND gate AND2 and the first pump driving signal PS1 to supply a predetermined control signal to the first driving unit 7, and The output of the AND gate AND1 and the second pump driving signal PS2 are ORed together to supply a predetermined control signal to the second driving unit 8. Consists of.

상기한 바와 같은 실시예를 가진 본 발명의 멀티펌프 구동제어회로의 작동관계를 기술하면 다음과 같다.Referring to the operation relationship of the multi-pump drive control circuit of the present invention having the embodiment as described above is as follows.

제2도 및 제3도에 도시된 본 발명의 멀티펌프 구동제어회로에서, 압력 스위치(S1)(S2)의 개폐여부에 따라 제2비교부(6)에서 펌프(P1)를 작동시키기 위한 제어신호가 출력되면 멀티펌프 구동검출부(20)를 통해 제1구동부(7)에 공급된다.In the multipump drive control circuit of the present invention shown in FIG. 2 and FIG. 3, a control for operating the pump P1 in the second comparison section 6 according to whether the pressure switches S1 and S2 are opened or closed. When the signal is output, the signal is supplied to the first driving unit 7 through the multi-pump driving detecting unit 20.

이와같이 제1구동부(7)에 제어신호가 공급되면 상기 제1구동부(7)에서는 스위칭소자(T1; 트라이막)의 게이트단에 하이를 출력하여 상기 스위칭소자(T1)를 작동시키므로 펌프(P1)에 상용교류전원이 공급되어 펌프(P1)가 기동된다.As such, when the control signal is supplied to the first driving unit 7, the first driving unit 7 outputs high to the gate terminal of the switching element T1 (tri film) to operate the switching element T1 and thus the pump P1. Commercial AC power is supplied to the pump to start the pump P1.

상기 펌프(P1)에 상용교류전원이 공급되어 기동되면 제1전류검출부(10)인 트랜스포머의 2차 코일에 고전류가 유기되고, 이 전류는 정류회로(BD1) 및 평활콘덴서(C1)를 통해 정류되고, 평활된 후 저항(R1)(R3)을 거쳐 비교기(OP1)의 반전단자(-)에 입력되어 비반전단자(+)에 인가된 기준전압(Vref1)과 비교되는데, 이때 비교기(OP1)의 반전단자(-)에 공급되는 전압이 기준전압(Vref1)보다 높게 되므로 비교기(OP1)의 출력은 로우 상태가 된다.When commercial AC power is supplied to the pump P1 and started, a high current is induced in the secondary coil of the transformer, which is the first current detector 10, and the current is rectified through the rectifying circuit BD1 and the smoothing capacitor C1. After smoothing, the input voltage is input to the inverting terminal (-) of the comparator OP1 through the resistors R1 and R3 and compared with the reference voltage V ref1 applied to the non-inverting terminal (+). Since the voltage supplied to the inverting terminal (-) of the () is higher than the reference voltage (V ref1 ), the output of the comparator (OP1) is a low state.

따라서, 제1펌프구동신호(PS1)와 비교기(OP1)의 출력을 논리곱하는 앤드게이트(AND1)의 출력도 로우상태가 되므로 오아게이트(OR1)의 출력은 제어신호인 제1펌프구동신호(PS1)가 되어 제1구동부(7)에 계속 공급되고, 이에 따라 펌프(P1)는 계속 기동된다.Therefore, the output of the AND gate AND1 that logically multiplies the output of the first pump driving signal PS1 and the comparator OP1 is also in a low state, so the output of the OR gate OR1 is the control signal of the first pump driving signal PS1. ) And continues to be supplied to the first driving unit 7, whereby the pump P1 is continuously started.

이와같이 작동하는 도중에 펌프(P1)가 기동되지 않을 때는 전류검출부(10)인 트랜스포머의 2차측 코일에 전류가 유기되지 않아 결국 비교기(OP1)에서 하이 신호가 출력되므로 앤트게이트(AND1)에서 제1펌프 구동제어신호(PS1)가 오아게이트(OR2)를 통해 제2구동부(8)에 공급된다.When the pump P1 is not started during the operation, no current is induced in the secondary coil of the transformer, which is the current detector 10, and a high signal is output from the comparator OP1. Thus, the first pump at the ant gate AND1. The driving control signal PS1 is supplied to the second driving unit 8 through the ora gate OR2.

상기 제2구동부(8)에 제1펌프 구동제어신호(PS1)가 공급되면 제2펌프(P2)에 상용교류전원을 공급하는 스위칭소자(T2)가 작동되므로 제2펌프(P2)가 기동된다.When the first pump driving control signal PS1 is supplied to the second driving unit 8, the switching device T2 for supplying a commercial AC power supply to the second pump P2 is operated, so that the second pump P2 is started. .

한편, 제어신호인 제2펌프구동신호(PS2)가 제2구동부(8)에 공급되어 제2펌프(P2)가 기동하는 도중에 고장이 발생하면 전술한 바와같이 비교기(OP2)의 출력이 하이 상태가 되어 앤드게이트(AND2)에서 제2펌프구동신호(PS2)가 출력되므로 제1구동부(7)가 작동하여 제1펌프(P1)를 기동시킨다.On the other hand, if a failure occurs while the second pump driving signal PS2 serving as the control signal is supplied to the second driving unit 8 and the second pump P2 is started, the output of the comparator OP2 is high as described above. Since the second pump driving signal PS2 is output from the AND gate AND2, the first driving unit 7 operates to start the first pump P1.

상술한 바와 같이 작동하는 본 발명에 따른 회로를 급. 배수 시스템에 채용하게 되면 하나의 펌프에서 고장이 발생하더라도 다른 펌프를 자동으로 기동하므로 원활한 급.배수를 할 수 있는 효과가 있다.Feeding circuits according to the invention which operate as described above. When it is adopted in the drainage system, even if a failure occurs in one pump, the other pump is automatically started, so that the smooth supply and drainage can be achieved.

Claims (3)

제1, 2펌프에 공급되는 상용교류전원을 각각 스위칭하는 스위칭소자와, 상기 스위칭소자들을 공급된 제어신호에 따라 선택적으로 구동하는 제1, 2구동부와, 상기 스위칭소자의 작동에 따라 각 펌프에 공급되는 전류를 검출하는 제1, 2전류검출부와, 상기 제1, 2전류검출부에서 출력되는 전류레벨에 따라 제1, 2구동부를 인네이블시키는 멀티펌프 구동결정부를 구성된 것을 특징으로 하는 멀티펌프의 구동제어회로.Switching elements for switching the commercial AC power supplied to the first and second pumps, First and second driving unit for selectively driving the switching elements in accordance with the supplied control signal, and each pump in accordance with the operation of the switching element The first and second current detection unit for detecting the current supplied, and the multi-pump drive determination unit for enabling the first and second driving unit according to the current level output from the first and second current detection unit Drive control circuit. 제1항에 있어서, 상기 제1, 2전류검출부는 트랜스포머로 구성된 것을 특징으로 하는 멀티펌프의 구동제어회로.The drive control circuit of claim 1, wherein the first and second current detection units comprise a transformer. 제1항에 있어서, 상기 멀티펌프 구동결정부는 제1, 2전류검출부(10)(15)의 트랜스포머의 2차측 코일에 유기된 전류를 정류하는 정류회로(BD1)(BD2)와, 상기 정류회로(BD1)(BD2)에서 출력된 전압과 설정된 기준전압 (Vref1)(Vref2)을 비교하여 펌프의 구동신호와 고장신호에 해당된 "하이" 또는"로우" 전압을 출력하는 비교기(OP1)(OP2)와, 상기 비교기(OP1)의 출력과 제1펌프구동신호(PS1)를 논리곱하는 앤드게이트(AND1)와, 상기 비교기(OP2)의 출력과 제2펌프구동신호(PS2)를 논리곱하는 앤드게이트(AND2)와, 상기 앤드게이트(AND2)의 출력과 제1펌프구동신호(PS1)를 논리합하여 제1구동부(7)에 소정의 제어신호를 공급하는 오아게이트(OR1)와, 상기 앤드게이트(AND1)의 출력과 제2펌프구동신호(PS2)를 논리합하여 제2구동부(8)에 소정의 제어신호를 공급하는 오아게이트(OR2)로 구성된 것을 특징으로 하는 멀티펌프의 구동제어회로.The rectifier circuit (BD1) (BD2) according to claim 1, wherein the multipump drive determination unit (1) rectifies the current induced in the secondary coil of the transformer of the first and second current detectors (10) and (15). Comparator OP1 comparing the voltage output from BD1 and BD2 with the set reference voltage V ref1 and V ref2 to output a “high” or “low” voltage corresponding to the drive signal and the fault signal of the pump. An AND gate AND1 that ANDs the output of the comparator OP1 and the first pump driving signal PS1, and an AND logic AND of the output of the comparator OP2 and the second pump driving signal PS2. An OR gate AND1 for ORing the AND gate AND2, the output of the AND gate AND2 and the first pump driving signal PS1, and supplying a predetermined control signal to the first driving unit 7, and the AND Ora gate OR2 for supplying a predetermined control signal to the second driver 8 by ORing the output of the gate AND1 and the second pump driving signal PS2. Drive control circuit of the multi-pump characterized in that.
KR1019940024318A 1994-09-27 1994-09-27 Driving control circuit for multi-pump KR970005552B1 (en)

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Publication number Priority date Publication date Assignee Title
US20210060216A1 (en) * 2018-01-02 2021-03-04 Kci Licensing, Inc. Negative pressure wound therapy device with silent piezoelectric pump

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KR102632328B1 (en) * 2021-10-29 2024-02-02 주식회사 휴비스 Composite yarn for cleaner, and fabric using thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210060216A1 (en) * 2018-01-02 2021-03-04 Kci Licensing, Inc. Negative pressure wound therapy device with silent piezoelectric pump
US11754063B2 (en) * 2018-01-02 2023-09-12 Kci Licensing, Inc. Negative pressure wound therapy device with silent piezoelectric pump

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