WO2021147587A1 - Circuit d'absorption de pointe de système de climatisation triphasé - Google Patents

Circuit d'absorption de pointe de système de climatisation triphasé Download PDF

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Publication number
WO2021147587A1
WO2021147587A1 PCT/CN2020/137863 CN2020137863W WO2021147587A1 WO 2021147587 A1 WO2021147587 A1 WO 2021147587A1 CN 2020137863 W CN2020137863 W CN 2020137863W WO 2021147587 A1 WO2021147587 A1 WO 2021147587A1
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WIPO (PCT)
Prior art keywords
varistor
discharge tube
phase
line
surge
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PCT/CN2020/137863
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English (en)
Chinese (zh)
Inventor
丛安平
邵海柱
耿焱
时斌
张波
冯正阳
贾新旭
刘春丽
胡象辉
Original Assignee
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2021147587A1 publication Critical patent/WO2021147587A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection

Definitions

  • the invention relates to the circuit structure of a three-phase air-conditioning system, in particular to a surge absorption circuit used in a three-phase air-conditioning system.
  • Air conditioners have become an indispensable electrical product in people's daily work and life.
  • Air conditioners are classified into three-phase air conditioners and single-phase air conditioners according to different power supply modes. Among them, single-phase air conditioners use 220V AC power supply, and three-phase air conditioners use 380V industrial power. Therefore, single-phase air conditioners are mostly used for family life with lower power, while three-phase air conditioners are mostly used for higher power and are mostly used in commercial places.
  • air conditioners especially three-phase electric air conditioners
  • the air conditioner will simulate the actual situation during the finished product inspection process.
  • Fig. 1 is a structural diagram of a surge absorption circuit used in a three-phase air conditioning system in the prior art.
  • L 1 , L 2 , and L 3 are the three phase wires used by the three-phase air conditioning system
  • N is the neutral wire
  • E 1 , E 2 , and E 3 are the ground wires.
  • the common mode inductor includes the first common mode coil l 1 and the second common mode coil l 2.
  • the two common mode coils can cancel each other's magnetic field effect between the coils; when the common mode current flows in, it appears High impedance and strong damping effect.
  • the present invention provides a three-phase air conditioning system.
  • Surge absorption circuit of phase air conditioning system including:
  • the surge absorption circuit further includes: a first surge absorption unit;
  • the first surge absorbing unit includes: a loop formed by a first varistor and a first discharge tube connected in series between the first phase line and the neutral line.
  • the first surge absorbing unit further includes: a loop formed by a second varistor and a second discharge tube connected in series between the second phase line and the neutral line, and in series connected with the first A loop formed by a third varistor and a third discharge tube between the three-phase line and the neutral line.
  • the surge absorbing circuit further includes: a second surge absorbing unit; the second surge absorbing unit includes: one end connected to the ground The other end of the fourth discharge tube is connected to the neutral line to form a loop.
  • the second surge absorption unit further includes:
  • the other end of the fourth discharge tube is connected in series with a fourth varistor and then connected to the neutral line, and the other end of the fourth discharge tube is connected in series with a fifth varistor and then connected to the third phase line,
  • the other end of the fourth discharge tube is connected in series with a sixth varistor and then connected to the second phase line, and the other end of the fourth discharge tube is connected in series with a seventh varistor after being connected to the first phase line. Phase connection.
  • the fourth discharge tube is a ceramic discharge tube; and/or, the fourth varistor, the fifth varistor, At least one of the sixth varistor and the seventh varistor is a 10D471 type varistor.
  • At least one of the first varistor, the second varistor, and the third varistor is a 20D471 type varistor resistance.
  • the surge absorption circuit for the three-phase air conditioning system further includes: a third surge absorption unit;
  • the third surge absorbing unit includes: a fifth discharge tube and an eighth varistor connected in series between the first phase line and the second phase line; and in series connected with the first phase line and The sixth discharge tube and the ninth varistor between the third phase line are sequentially connected in series with the seventh discharge tube and the tenth varistor between the second phase line and the third phase line.
  • the first discharge tube, the second discharge tube, the third discharge tube, the fifth discharge tube, and the first discharge tube At least one of the six discharge tubes and the seventh discharge tube is a novel open-circuit failure gas discharge tube.
  • the surge absorption circuit for the three-phase air conditioning system further includes: a common mode inductor; the common mode inductor includes a first common mode coil and a second common mode coil connected in series; The first common mode coil is connected to the first phase line, the second phase line, the third phase line, and the neutral line respectively; the second common mode coil is connected to the rectifier bridge of the three-phase air conditioning system; common mode A noise absorbing unit, the common mode noise absorbing unit is connected between the first common mode coil and the second common mode coil.
  • the present invention also provides a three-phase air-conditioning system, the three-phase air-conditioning system includes the surge absorption circuit according to any one of the above solutions.
  • each phase in the circuit of the present invention has withstood more than 30 lightning strike tests, and there is no problem of damage to the rectifier bridge or the discharge tube.
  • the present invention also includes a second surge absorbing unit, which includes a fourth varistor, a fifth varistor, a sixth varistor, a seventh varistor, and a fourth discharge tube.
  • the second surge The absorption unit further improves the ability to absorb and withstand surge voltages of several thousand volts. In the actual surge test link, the surge absorption unit can withstand 120 lightning strike tests and can ensure the normal use of the circuit.
  • the present invention also includes a third surge absorbing unit, which includes a fifth discharge tube, a sixth discharge tube, a seventh discharge tube, and an eighth varistor, a ninth varistor, and a tenth varistor. While the surge absorption unit further ensures the stable operation of the surge absorption circuit, it can also reduce the residual pressure between phases in the three-phase air conditioning system, thereby ensuring the normal use of the three-phase air conditioning.
  • Fig. 1 is a structural diagram of a surge absorption circuit used in a three-phase air conditioning system in the prior art.
  • Fig. 2 is a structural diagram of a preferred embodiment of a surge absorption circuit for a three-phase air conditioning system according to the present invention.
  • Figures 3, 4, and 5 are structural diagrams of other three preferred embodiments of a surge absorption circuit for a three-phase air conditioning system according to the present invention.
  • connection and “connected” should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. , Or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.
  • FIG. 2 is a structural diagram of an embodiment of a surge absorption circuit for a three-phase air conditioning system according to the present invention.
  • the surge absorption circuit includes: a first phase line L 1 , a second phase line L 2 , a third phase line L 3 and a neutral line N.
  • the phase wire of the household electrical appliance may be a live wire.
  • the surge absorption circuit further includes: a first surge absorption unit 1; the first surge absorption unit 1 includes a first discharge tube DSA 1 , a first varistor DNZ 1 , a second discharge tube DSA 2 , and a second The varistor DNZ 2 , the third discharge tube DSA 3 and the third varistor DNZ 3 .
  • first phase line L 1 is connected to a first end of the first varistor DNZ 1, the second end of the first varistor DNZ a first end connected to a first discharge tube 1 of the DSA, the first discharge tube
  • the second end of the DSA 1 is connected to the neutral line N, thereby forming a loop of the first phase line L 1 -the first varistor DNZ 1 -the first discharge tube DSA 1 -the neutral line N.
  • the second phase line L 2 is electrically connected to the first end of the second varistor DNZ 2
  • the second end of the second varistor DNZ 2 is electrically connected to a first end of a second discharge tube 2 of the DSA
  • the second The second end of the discharge tube DSA 2 is electrically connected to the neutral line N, thereby forming a loop of the second phase line L 2 -the second varistor DNZ 2 -the second discharge tube DSA 2 -the neutral line N.
  • the third line L 3 with a first end connected to the third 3 DNZ varistor, the varistor third DNZ second end 3 of the third discharge tube 3 is connected to a first end of DSA, DSA third discharge tube 3
  • the second end of is connected to the neutral line N, thereby forming a loop of the third phase line L 3 — the third varistor DNZ 3 — the third discharge tube DSA 3 — the neutral line N.
  • the surge protection circuit of the present invention also includes a common mode inductor 2.
  • the common mode inductor 2 includes a first common mode coil 21 and a second common mode coil 22 connected in series;
  • the mode coil 21 is respectively connected to the first phase line L 1 , the second phase line L 2 , the third phase line L 3 , and the neutral line N;
  • the second common mode coil 22 is connected to the rectifier bridge of the three-phase air conditioning system (not shown in the figure) show).
  • the first common mode coil 21 includes a first inductor 211, a second inductor 212, a third inductor 213, and a fourth inductor 214.
  • first inductor 211 an end of the first inductor 211 and the third line L 3 phase connection; end of the second inductor 212 is connected to a second phase line L 2; end of the third inductor 213 and the first phase line L 1; fourth inductor 214
  • One end of is connected to the neutral line N.
  • the second common mode coil 22 includes a fifth inductor 221, a sixth inductor 222, a seventh inductor 223, and an eighth inductor 224.
  • One end of the fifth inductor 221 is connected to the other end of the first inductor 211; one end of the sixth inductor 222 is connected to the other end of the second inductor 212; one end of the seventh inductor 223 is connected to the other end of the third inductor 213; One end of the eight inductor 224 is connected to the other end of the fourth inductor 214. Further, the other end of the fifth inductor 221, the other end of the sixth inductor 222, the other end of the seventh inductor 223 and the other end of the eighth inductor 224 will be connected to different rectifier bridges for rectification (not shown in the figure), No more details here.
  • the surge absorbing circuit also includes a common mode noise absorbing unit 3, and the common mode noise absorbing unit 3 is connected between the first common mode coil 21 and the second common mode coil 22.
  • the common mode noise absorption unit 3 includes a first Y capacitor 31, a second Y capacitor 32, a third Y capacitor 33, and a fourth Y capacitor 34.
  • One end of the first Y capacitor 31 is connected to one end of the fifth inductor 221 and the other end of the first inductor 211; one end of the second Y capacitor 32 is connected to one end of the sixth inductor 222 and the other end of the second inductor 212; One end of the three Y capacitor 33 is connected to one end of the seventh inductor 223 and the other end of the third inductor 213; one end of the fourth Y capacitor 34 and one end of the eighth inductor 224 are connected to the other end of the fourth inductor 214.
  • the other end of the first Y and second Y-capacitor 31 and the other end of the capacitor 32 are connected to the ground E 1, the other end of the third capacitor 33 and fourth Y Y capacitor and the other end connected to the ground E 2 34.
  • the common mode noise absorbing unit 3 is added between the common mode inductors 2 to effectively eliminate the common mode noise generated by the current in the same direction. A better grounding effect can be achieved by using different ground wires E 1 and E 2 connection methods.
  • Y capacitors are safety capacitors, they are capacitors used in this kind of occasions, that is, after the capacitor fails, it will not cause electric shock and will not endanger personal safety.
  • the Y capacitor is a capacitor connected across the phase line and the ground line and the ground respectively. Due to the limitation of leakage current, the Y capacitor value cannot be too large, and the Y capacitor is generally nF. The Y capacitor suppresses common mode interference.
  • connection relationship between each inductor and the phase line and the inductor is described above, this is not restrictive, and those skilled in the art can adjust the connection relationship as needed.
  • the surge protection circuit according to the present invention further comprises a second surge absorption unit 4, comprising a fourth discharge tube 4 the DSA, the DSA and the fourth discharge tube 4 at one end to the other end of the series connection of the ground line PE
  • the seventh varistor DNZ 7 and the fourth discharge tube DSA 4 can be used to stabilize and limit the voltage.
  • the fourth discharge tube DSA 4 needs to perform 30 lightning strike tests for the three phase lines and the neutral line, and the total will reach 120 times.
  • the fourth discharge tube DSA 4 The use of ceramic discharge tubes can increase its resistance to lightning strikes.
  • at least one of the fourth varistor DNZ 4 , the fifth varistor DNZ 5 , the sixth varistor DNZ 6 and the seventh varistor DNZ 7 is a 10D471 type varistor. This varistor has better surge absorption capability, and therefore is more suitable for use in the surge absorption circuit of the present invention.
  • the fourth varistor DNZ 4 , the fifth varistor DNZ 5 , the sixth varistor DNZ 6 and the seventh varistor DNZ 7 can also be 10D561 type varistors.
  • the difference between the two is mainly the difference in the voltage limit, the 10D471 type varistor is 470V, and the 10D561 type varistor is 560V.
  • At least one of the first varistor DNZ 1 , the second varistor DNZ 2 and the third varistor DNZ 3 is a 20D471 type varistor. Compared with 10D471 type varistor, it can withstand higher current.
  • those skilled in the art can also set one or part (but not all) of the above-mentioned varistors to the above-mentioned model, or set one (but not all) of the above-mentioned discharge tubes to the above-mentioned model, as required.
  • the above-mentioned varistor or discharge tube can be set to other models suitable for surge absorption circuits. This adjustment does not deviate from the basic principle of the present invention, and therefore all fall within the protection scope of the present invention.
  • the surge absorbing circuit of the present invention further includes a third surge absorbing unit 5; the third surge absorbing unit 5 includes a first phase line L 1 and a second phase line L 2 connected in series.
  • DSA 5 the discharge tube and the eighth five varistor DNZ 8 eg: a first phase line L 1 connecting the fifth end of the discharge tube DSA 5, the fifth discharge tube DSA 5 connected to one end of the other end of the varistor DNZ 8 of the eighth, The other end of the eighth varistor DNZ 8 is connected to the second phase line L 2 );
  • the sixth discharge tube DSA 6 and the ninth varistor are sequentially connected in series between the first phase line L 1 and the third phase line L 3 DNZ 9 (for example: a first phase line L 1 connecting one end of the sixth discharge tube DSA 6, the sixth discharge tube DSA 6 other end is connected one end of a ninth resistor DNZ 9, the other end of the ninth resistor DNZ 9 is connected to a third phase line L 3 );
  • At least one of the eighth varistor DNZ 8 , the ninth varistor DNZ 9 and the tenth varistor DNZ 10 is a 20D621 type varistor with a voltage limit value of 620V.
  • the first surge absorbing unit includes: a loop formed by a first varistor DNZ 1 and a first discharge tube DSA 1 connected in series between the first phase line and the neutral line.
  • the fourth discharge tube DSA 4 is preferably a gas discharge tube, and the first discharge tube DSA 1 , the second discharge tube DSA 2 , and the third
  • the discharge tube DSA 3 , the fifth discharge tube DSA 5 , the sixth discharge tube DSA 6 and the seventh discharge tube DSA 7 are preferably novel open-circuit failure gas discharge tubes.
  • the difference is that the new type of open circuit failure gas discharge tube has a larger withstand voltage resistance, which can effectively prevent the varistor in series from being damaged due to high-pressure combustion.
  • the fourth discharge tube DSA 4 is connected to the three phase lines L 1. Between L 2 , L 3 , the neutral wire N and the ground wire PE, the AC voltage of about 1850V will withstand, so the gas discharge tube can better withstand the high voltage.
  • the third surge absorbing unit 5 between the three-phase lines uses a 621 pressure sensitive string 1000V OGDT (new open-circuit failure gas discharge tube), and the withstand voltage fluctuation can reach about AC600V on the line, while reducing the phase and phase.
  • OGDT in series can effectively prevent pressure-sensitive fires.
  • the first surge absorption unit 1 between the phase line and the neutral line N uses a 471 pressure sensitive string 600V OGDT.
  • the second surge absorbing unit 4 between the phase line, neutral line N and PE uses 471/561 pressure sensitive series connection with 3600V GDT (gas discharge tube), which can be used to withstand AC1 850V, 3600V GDT lightning (surge) Impact) 120 times, because the 3600V GDT may have the risk that the voltage waveform cannot meet the AC withstand voltage after 120 lightning strikes, if you want to increase the number of lightning strikes, use B5G3600-C to withstand the number of times better.
  • 3600V GDT gas discharge tube
  • FIGS. 3, 4, and 5 the structure diagrams of several other preferred simplified circuit embodiments of the surge absorption circuit used in the three-phase air conditioning system according to the present invention will be described. Among them, the circuit is simplified and changed on the basis of FIG. 2, and the parts of the same content as shown in FIG. 2 in each embodiment will not be repeated.
  • the second surge absorbing unit 4 is simplified to include: a fourth discharge tube DSA 4 with one end connected to the ground PE, and the other end of the fourth discharge tube DSA 4 Connect with the neutral line N to form a loop. In this way, since there is usually no voltage difference between the neutral line N and the ground line PE, only the fourth discharge tube DSA 4 can be used when the surge voltage is generated, without the need for a varistor to close the arc.
  • the third surge absorbing unit 5 shown in Figure 2 is maintained between the three-phase lines; the first surge absorbing unit 1 shown in Figure 2 is maintained between the three-phase line and the neutral line N
  • the simplified second surge absorbing unit 4 of the three-phase line and the neutral line N to the ground PE, test the surge, through the varistor and GDT in the first surge absorbing unit 1, Then to 3600V GDT for venting, the device withstands 30 times of differential mode 3KA+30 times of common mode 500A surge.
  • the first surge absorbing unit 1 is simplified to include: a first discharge tube DSA 1 , a first varistor DNZ 1 , wherein the first phase line L 1 a first end connected to the first varistor DNZ 1, the second end of the first varistor DNZ a first end connected to a first discharge tube 1 of the DSA, DSA second end of the first discharge tube 1 is zero
  • the line N is connected, thereby forming a loop of the first phase line L 1 -the first varistor DNZ 1 -the first discharge tube DSA 1 -the neutral line N.
  • the second and third surge absorbing units 4 and 5 maintain the way shown in Figure 2.
  • the first surge absorbing unit 1 When the first surge absorbing unit 1 is tested, only the first phase line L 1 is used in the subsequent circuit. And the neutral line N, only use OGDT+MOV on the first phase line L 1 to the neutral line N to reduce the residual voltage; while the second and third phase lines L 2 and L 3 surge to the neutral line N pass The components of the third surge absorbing unit 5 are shared.
  • the residual voltage of the second phase line L 2 to the neutral line N and the third phase line L 3 to the neutral line N are relatively high, but it is also sufficient if the subsequent stage does not have a circuit directly connected. ;
  • the pressure sensitive and OGDT between the second phase line L 2 and the third phase line L 3, and between the second phase line L 2 and the first phase line L 1 must withstand 60 3KA lightning strikes (surges).
  • the third preferred embodiment of simplified structure as shown in FIG. 5, the structure of the first surge absorbing unit 1 is simplified to include: a first discharge tube DSA 1 , a first varistor DNZ 1 , where the first phase line L DNZ varistor 1 of the first terminal 1 is connected to a first, a second end of the first varistor DNZ a first end connected to a first discharge tube 1 of the DSA, the DSA second end of the first discharge tube 1 and The neutral line N is connected to form a loop of the first phase line L 1 -the first varistor DNZ 1 -the first discharge tube DSA 1 -the neutral line N;
  • the structure of the second surge absorption unit 4 is simplified to include:
  • the fourth discharge tube DSA 4 has one end connected to the ground wire PE, and the other end of the fourth discharge tube DSA 4 is connected to the neutral line N to form a loop.
  • the device between the first phase line L 1 and the second phase line L 2 withstands 60 times of 3KA+30 times of 500A surges, and the first phase line
  • the device between L 1 and the third phase line L 3 withstands 60 3KA+30 times 500A surges, the device between the second phase line L 2 and the third phase line L 3 withstands 30 times 3KA surges, the first phase line
  • the device between L 1 and the neutral line N withstands 90 times of 3KA+90 times of 500A surges, and the device between the neutral line N and the ground line PE withstands 120 times of 500A surges.
  • the present invention also provides a three-phase air conditioning system.
  • the three-phase air conditioning system includes the various surge absorption circuits described above.
  • the technical effect that can be obtained by the three-phase air conditioning system is the same as the above-mentioned surge absorption circuit, and will not be repeated here.

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Abstract

La présente invention concerne une structure de circuit de système de climatisation triphasé, plus particulièrement un circuit d'absorption de pointe du système de climatisation triphasé, dont le but est de résoudre le problème technique de la façon d'améliorer un circuit d'absorption de pointe d'un système de climatisation triphasé pour améliorer la performance efficace de résistance à plusieurs hautes tensions de pointe de plusieurs milliers de volts. À cet effet, la présente invention fait appel à la structure suivante : une première ligne de phase, une deuxième ligne de phase, une troisième ligne de phase, une ligne de neutre, et une première unité d'absorption de pointe, la première unité d'absorption de pointe comprenant une boucle formée par une première varistance et un premier tube de décharge qui sont connectés en série entre la première ligne de phase et la ligne de neutre. Selon la présente invention, le fait de faire appel à l'ajout d'une structure d'une varistance et d'un tube de décharge entre une ligne de phase et une ligne de neutre améliore l'absorption et les capacités de tenue d'un circuit d'absorption de pointe à une tension, de manière à garantir une utilisation normale d'un système de climatisation triphasé.
PCT/CN2020/137863 2020-01-20 2020-12-21 Circuit d'absorption de pointe de système de climatisation triphasé WO2021147587A1 (fr)

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CN202010067279.0 2020-01-20
CN202010067279.0A CN113141002A (zh) 2020-01-20 2020-01-20 用于三相空调系统的浪涌吸收电路

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CN113991625B (zh) * 2021-10-20 2023-07-28 华为技术有限公司 一种浪涌防护器件和供电系统

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