WO2015058538A1 - 电源电路和空调机组 - Google Patents
电源电路和空调机组 Download PDFInfo
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- WO2015058538A1 WO2015058538A1 PCT/CN2014/079986 CN2014079986W WO2015058538A1 WO 2015058538 A1 WO2015058538 A1 WO 2015058538A1 CN 2014079986 W CN2014079986 W CN 2014079986W WO 2015058538 A1 WO2015058538 A1 WO 2015058538A1
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- WIPO (PCT)
- Prior art keywords
- bus
- air conditioning
- power supply
- conditioning unit
- main board
- Prior art date
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Classifications
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
Definitions
- the present invention relates to the field of electrical and air conditioning, and in particular to a power supply circuit and an air conditioning unit.
- BACKGROUND OF THE INVENTION Inverter central air conditioners (centrifugal units, etc.) electrical control is divided into two parts: one part is the main circuit, the main load is the compressor; the other part is the control circuit, the main load is the controller, the valve body, the sensor and the like.
- the main circuit part of a general conventional variable frequency central air conditioner is used to rectify and invert the 380V or 220V AC power to the compressor, and the control circuit is used to rectify the 380V or 220V AC power.
- the main circuit voltage of the conventional variable frequency central air conditioner is generally DC (Direct Current, DC for short) 400V-700V; the control loop voltage is generally AC (Alternating Current, AC for short) 380V AC220V DC24V, DC12V and DC5V, etc., that is, a wide variety of conventional variable frequency central air conditioning voltages.
- DC Direct Current
- AC Alternating Current
- a primary object of the present invention is to provide a power supply circuit and an air conditioning unit to solve the problem of relatively serious electromagnetic interference between different types of voltages in a power supply circuit in the related art.
- a power supply circuit is provided in accordance with the present invention.
- the power circuit comprises: a rectifier connected in sequence, a first DC bus and an inverter, and further comprising: a switching power supply, the input end of the switching power supply is connected to the first DC bus, the output end of the switching power supply and the second DC bus Connected, the switching power supply supplies power to the weak current load through the second DC bus.
- the power supply circuit further includes: a first switch disposed on the positive bus of the second DC bus; and/or a second switch disposed on the negative bus of the second DC bus. Further, the voltage of the first DC bus is greater than the voltage of the second DC bus.
- the air conditioning unit comprises: a power supply circuit, wherein the power supply circuit comprises a switching power supply and a rectifier connected in sequence, a first DC bus and an inverter, wherein the input end of the switching power supply is connected to the first DC bus, and the output end of the switching power supply Connected to the second DC bus, the switching power supply supplies power to the weak current load via the second DC bus; and the compressor and/or permanent magnet synchronous motor powered by the inverter.
- the power circuit further includes: a first switch disposed on the positive bus of the second DC bus; and/or a second switch disposed on the negative bus of the second DC bus.
- the weak current load includes: a main board for controlling the air conditioning unit, and the main board is connected to the second DC bus.
- the weak current load further includes: a first temperature sensor, the first end of the first temperature sensor is connected to the positive bus of the second DC bus, and the second end of the first temperature sensor is connected to the main board, and is used for detecting the refrigerant of the air conditioning unit Temperature and / or chilled water temperature and / or cooling water temperature.
- the weak current load further includes: a pressure sensor, the first end of the pressure sensor is connected to the positive bus of the second DC bus, and the second end of the pressure sensor is connected to the main board for detecting the system pressure of the air conditioning unit.
- the weak current load further includes: a second temperature sensor connected to the main board and powered by the main board, and the second temperature sensor is a thermistor temperature sensor.
- the weak current load further includes: a touch screen, the first end and the second end of the touch screen are connected to the main board for transmitting data, the third end of the touch screen is connected to the positive bus of the second DC bus, and the fourth end of the touch screen is connected to The negative bus of the second DC bus is used to power the touch screen.
- the weak electrical load further includes: an electronic expansion valve and/or a temperature protector and/or a fault detector connected to the main board and powered by the main board.
- the weak current load further includes: an indicator light, the first end is connected to the positive bus of the second DC bus, and the second end is connected to the negative bus of the second DC bus. Further, the voltage of the first DC bus is greater than the voltage of the second DC bus.
- the voltage of the first DC bus is 400V to 700V
- the voltage of the second DC bus is 5V to 48V.
- the air conditioning unit is a centrifugal chiller or a screw chiller.
- a rectifier, a first DC bus and an inverter connected in sequence are used, and an input end of the switching power supply is connected to the first DC bus, and an output end of the switching power supply is connected to the second DC bus, and the switching power supply is passed
- the second DC bus is used to supply the weak electric load, which solves the problem that the electromagnetic interference between different types of voltages in the power supply circuit in the related art is relatively serious, thereby achieving the effect of improving the anti-interference of the power supply circuit.
- FIG. 1 is a schematic diagram of a power supply circuit according to an embodiment of the present invention
- FIG. 2 is a schematic diagram showing a circuit configuration of an air conditioning unit according to a first embodiment of the present invention
- FIG. 3 is an air conditioner according to a second embodiment of the present invention. Schematic diagram of the circuit structure of the unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments.
- a power supply circuit for providing AC power to a high voltage main circuit and DC power to a low voltage control circuit.
- the power circuit of the embodiment of the present invention can be used for the power circuit of the variable frequency central air conditioning unit, and the air conditioning unit can be a centrifugal chiller or a screw chiller.
- the power supply circuit includes: a rectifier 10, an inverter 20, a switching power supply 30, a first DC bus 40, and a second DC bus 50.
- the rectifier 10 is disposed in the main circuit, and is in communication with the first DC bus 40 and the inverter 20, and the rectifier 10 is configured to rectify the commercial power to obtain a DC voltage, which is the first DC bus 40.
- the voltage, wherein the mains can be three-phase electricity, for example, the mains can be AC380V or AC220V, so that the rectifier 10 can rectify the voltage of AC380V or AC220V to DC400V to DC700V,
- the voltage of the DC 400V to DC700V is the voltage of the first DC bus 40.
- the voltage of the first DC bus 40 may be a DC high voltage
- the voltage of the second DC bus 50 may be a DC low voltage, that is, the voltage of the first DC bus 40 may be Greater than the voltage of the second DC bus 50.
- the inverter 20 is disposed in the main circuit, and is connected to the rectifier 10 through the first DC bus 40, and the inverter 20 is configured to invert the DC voltage of the first DC bus 40 to obtain an AC voltage, wherein The AC voltage can drive the compressor and/or permanent magnet synchronous motor.
- the input end of the switching power supply 30 is connected to the first DC bus 40, the output end of the switching power supply 30 is connected to the second DC bus 50, and the switching power supply 30 supplies power to the weak electric load through the second DC bus 50.
- the switching power supply 30 can be a high voltage switching power supply.
- the switching power supply 30 is configured to convert the DC voltage of the first DC bus 40 to the DC voltage of the second DC bus 50.
- the switching power supply 30 can convert the DC high voltage of the first DC bus 40 from DC400V to DC700V. It is DC48V or DC24V or DC12V or DC5V.
- the two input ends of the switching power supply 30 are respectively connected to the positive bus bar of the first DC bus 40 and the negative bus of the first DC bus 40 in the main circuit, that is, to the two output ends of the rectifier 10, the switching power supply.
- the two outputs of the 30 are respectively connected to the positive bus of the second DC bus 50 in the low voltage control circuit and the negative bus of the second DC bus 50.
- the switching power supply 30 is used to provide the weak current load of the low voltage control circuit through the second DC bus 50.
- the DC power supply wherein the voltage value of the DC power supply provided by the switching power supply 30 for the low voltage control circuit can be adjusted.
- the switching power supply 30 can be taken from the high DC voltage side of the rectifier 10 in the main circuit by means of step-down. Electric, that is, taking power from the first DC bus 40, and reducing the high DC voltage to a low DC voltage to supply a power voltage to the low voltage control loop. Therefore, only one type of voltage of the DC voltage is in the low voltage control loop, achieving a low voltage.
- FIG. 2 is a schematic view showing the circuit configuration of an air conditioning unit according to a first embodiment of the present invention. As shown in FIG. 2, this embodiment can be used as a preferred embodiment of the embodiment shown in FIG. 1.
- the air conditioning unit of this embodiment includes the power supply circuit of the first embodiment, that is, the rectifier 10, the inverter 20, and the switching power supply 30.
- the utility model further includes: a weak electric load 60 and a compressor 70. It should be noted that the power circuit of the embodiment of the present invention can be used for the power circuit of the variable frequency central air conditioning unit.
- the air conditioning unit can be a centrifugal chiller or a screw chiller.
- the air conditioning unit can also include a permanent magnet synchronous motor.
- the functions of the power supply circuit i.e., the rectifier 10, the inverter 20, the switching power supply 30, the first DC bus 40, and the second DC bus 50) are the same as those in the first embodiment, and are not described herein again.
- the weak electrical load 60 may include a main board for controlling the air conditioning unit, a touch screen, one or more temperature sensors, pressure sensors, electronic expansion valves, temperature protectors, fault detectors, indicator lights, and other weak electrical loads.
- the compressor 70 is disposed in the main circuit, and the compressor 70 is connected to the inverter 20.
- FIG. 3 is a schematic view showing the circuit configuration of an air conditioning unit in accordance with a second embodiment of the present invention. As shown in FIG. 3, this embodiment can be used as a preferred embodiment of the embodiment shown in FIG. 1.
- the air conditioning unit of this embodiment includes the power supply circuit of the first embodiment, that is, the rectifier 10, the inverter 20, and the switching power supply 30.
- the first DC bus 40 and the second DC bus 50 In addition to the first DC bus 40 and the second DC bus 50, the first switch 80 and the second switch 90, and the main board 601, the first temperature sensor 602, the pressure sensor 603, the second temperature sensor 604, and the touch screen 605, electronic expansion valve 606, temperature protector 607, fault detector 608, indicator light 609 and other weak electrical loads 610 and other weak electrical loads 60.
- the functions of the power supply circuit i.e., the rectifier 10, the inverter 20, the switching power supply 30, the first DC bus 40, and the second DC bus 50
- the power supply circuit i.e., the rectifier 10, the inverter 20, the switching power supply 30, the first DC bus 40, and the second DC bus 50
- the voltage of the first DC bus 40 may be a DC high voltage
- the voltage of the second DC bus 50 may be a DC low voltage
- the voltage of the first DC bus 40 may be Greater than the voltage of the second DC bus 50.
- the voltage of the first DC bus may be 400V to 700V
- the voltage of the second DC bus may be 5V to 48V.
- the first switch 80 is disposed on the positive bus of the second DC bus.
- the second switch 90 is disposed on the negative bus of the second DC bus.
- the first switch 80 and the second switch 90 are used for controlling the on and off of the low voltage control loop. It should be noted that, in the embodiment of the present invention, only one switch may be used to control the conduction and disconnection of the low voltage control loop.
- the main board 601 is connected to the second DC bus 50.
- the main board 601 has a microprocessor, a memory, a digital processor, a controller, and the like for controlling the first temperature sensor 602, the pressure sensor 603, and the like.
- the weak electric load 60 performs detection, and performs data processing such as storage of the detection result.
- the motherboard 601 can also provide power to the control device.
- the first end of the first temperature sensor 602 is connected to the second end of the first switch 80 and the input end of the main board 601, that is, the first end of the first temperature sensor 602 is connected to the second DC bus 50, and the first temperature sensing 602
- the second end is connected to the main board 601 for detecting the temperature of the refrigerant and/or the temperature of the water in the air conditioning unit.
- the first temperature sensor 602 takes power from the switching power supply 30 and transmits the detected temperature value to the main board.
- the first temperature sensor 602 may include one or more.
- the one or more first temperature sensors 602 are used to detect an environment in the variable frequency central air conditioning unit that has high demand for temperature detection accuracy, such as detecting the suction and exhaust temperatures of the compressor.
- the first temperature sensor 602 is a platinum resistance temperature sensor.
- the first end of the pressure sensor 603 is connected to the second end of the first switch 80, the input end of the main board 601 and the first end of the first temperature sensor 602, and the second end of the pressure sensor 603 is connected to the main board 602 for detecting the air conditioner.
- the pressure sensor 603 takes power from the switching power supply 30 and transmits the detected pressure value to the main board 601.
- the pressure sensor 603 may include one or more, and the one or more pressure sensors 603 may detect the compressor suction and exhaust pressure of the variable frequency central air conditioning unit, the pressure of the piping and/or the pressure vessel throughout the air conditioning unit.
- the second temperature sensor 604 is disposed in the low voltage control loop and is coupled to the main board 601. The second temperature sensor 604 takes power from the main board 601.
- the second temperature sensor 604 may include one or more, and the one or more second temperature sensors 604 may detect an environment in the variable frequency central air conditioning unit that does not require high temperature detection accuracy, such as lubricating oil temperature detection, ambient temperature detection, and the like.
- the second temperature sensor 604 is a thermistor temperature sensor.
- the touch screen 605 is disposed in the low voltage control loop, and the first end and the second end of the touch screen 605 are connected to the main board 601, the third end of the touch screen 605 is connected to the positive bus of the second DC bus 50, and the third of the touch screen 605 The terminal is connected to the negative bus of the second DC bus 50.
- the first end and the second end of the touch screen 605 are connected to the main board 601 as data lines, thereby performing data communication with the main board 601.
- the temperature of the air conditioning unit can be set by the touch screen 605.
- the touch screen 605 can send temperature setting information to the microprocessor on the main board 601 through its first end and second end.
- the microprocessor on the main board 601 can also transmit control information to the touch screen 605 through the first end and the second end.
- the touch screen 605 can also be used to display information such as temperature, pressure, time, and the like.
- the touch screen 605 draws power from the main board 601 through the third end of the touch screen 605 and the fourth end of the touch screen 605.
- the electronic expansion valve 606 is disposed in the low pressure control circuit and is coupled to the main plate 601 for regulating the amount of liquid supplied from the evaporator.
- the electronic expansion valve 606 is powered from the main board 601.
- the temperature protector 607 is disposed in the low voltage control circuit and is connected to the main board 601 for protecting the air conditioning unit from operating within a certain temperature range.
- the temperature protector 607 takes power from the main board 601.
- the fault detector 608 is disposed in the low voltage control loop and is connected to the main board 601.
- the fault detector 608 can detect the fault information of the air conditioning unit and send the fault information to the microprocessor on the main board 601.
- the microprocessor on the main board 601 can display the fault information on the touch screen 605 to notify the maintenance personnel to perform the repair.
- the fault detector 608 takes power from the main board 601.
- a power management module is provided on the main board 601 for supplying a suitable voltage to the second temperature sensor 603, the electronic expansion valve 606, the temperature protector 607, and the fault detector 608.
- the indicator light 609 is disposed in the low voltage control circuit, and the first end thereof is connected to the second end of the first switch 80, that is, the first end is connected to the positive bus bar of the second DC bus 50, and the second end of the indicator light 609 is connected to the first end.
- the second end of the second switch 90 that is, the second end is connected to the negative bus of the second DC bus 50.
- the indicator light 609 may be one or more, and the one or more indicator lights 609 are used to indicate an operating state, a fault state, and the like of the air conditioning unit.
- the other weak electric load 610 is disposed in the low voltage control circuit, and the first end of the other weak electric load 610 is connected to the second end of the first switch 80, that is, the first end is connected to the positive bus of the second DC bus 50, and the second end is connected. To the second end of the second switch 80, that is, the second end is connected to the negative bus of the second DC bus 50.
- the high DC voltage side of the rectifier 10 takes power and reduces the high DC voltage to a low DC voltage to supply a power supply voltage to the low voltage control loop. Therefore, only one type of voltage of the DC voltage is present in the low voltage control loop, realizing a low voltage control loop.
- the full DC thereby reducing the electromagnetic interference in the power circuit, thereby achieving the effect of improving the anti-interference, electromagnetic compatibility and safety of the power circuit.
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Abstract
一种电源电路,其包括依次连接的整流器(10)、第一直流母线(40)和逆变器(20),还包括开关电源(30),开关电源(30)的输入端与第一直流母线(40)相连接,开关电源(30)的输出端与第二直流母线(50)相连接,开关电源(30)通过第二直流母线(50)为弱电负载(60)供电。还公开了一种具有该电源电路的空调机组。
Description
电源电路和空调机组 技术领域 本发明涉及电气及空调领域, 具体而言, 涉及一种电源电路和空调机组。 背景技术 变频中央空调 (离心机组等) 电气控制分为两部分: 一部分是主回路, 主要负载 为压缩机; 另外一部分是控制回路, 主要负载为控制器、 阀体、 传感器等。 在相关技术中,一般常规的变频中央空调的主回路部分用于将 380V或者 220V的 交流电经过整流和逆变后提供给压缩机,而控制回路则用于将 380V或者 220V的交流 电经过整流后提供给控制器、 阀体、 传感器等, 因此, 常规的变频中央空调的主回路 电压一般为直流 (Direct Current, 简称 DC) 400V-700V; 控制回路电压一般为交流 (Alternating Current, 简称 AC) 380V AC220V DC24V、 DC12V和 DC5V等, 即 常规的变频中央空调电压的种类繁多。 这样, 在变频中央空调的电气系统里, 由于同时存在直流电压和交流电压, 因此 需要使用多种类型的电气设备和电源处理装置,这使得电路电压系统非常复杂。另外, 由于电压类型不同, 不同类型电压之间相互干扰非常严重, 大大降低了整个电气控制 系统的可靠性。 针对相关技术中电源电路中不同类型电压之间的电磁干扰比较严重的问题, 目前 尚未提出有效的解决方案。 发明内容 本发明的主要目的在于提供一种电源电路和空调机组, 以解决相关技术中电源 电路中不同类型电压之间的电磁干扰比较严重的问题。 为了实现上述目的, 根据本发明提供了一种电源电路。 该电源电路包括: 依次 连接的整流器、 第一直流母线和逆变器, 还包括: 开关电源, 开关电源的输入端与 第一直流母线相连接, 开关电源的输出端与第二直流母线相连接, 开关电源通过第 二直流母线为弱电负载供电。 进一步地, 该电源电路还包括: 第一开关, 设置在第二直流母线的正极母线上; 和 /或第二开关, 设置在第二直流母线的负极母线上。
进一步地, 第一直流母线的电压大于第二直流母线的电压。 为了实现上述目的, 根据本发明还提供了一种空调机组。 该空调机组包括: 电 源电路, 其中, 电源电路包括开关电源和依次连接的整流器、 第一直流母线和逆变 器, 开关电源的输入端与第一直流母线相连接, 开关电源的输出端与第二直流母线 相连接, 开关电源通过第二直流母线为弱电负载供电; 以及通过逆变器供电的压缩 机和 /或永磁同步电机。 进一步地, 电源电路还包括: 第一开关, 设置在第二直流母线的正极母线上; 和 /或第二开关, 设置在第二直流母线的负极母线上。 进一步地, 弱电负载包括: 用于控制空调机组的主板, 主板与第二直流母线相 连接。 进一步地, 弱电负载还包括: 第一温度传感器, 第一温度传感器的第一端连接 至第二直流母线的正极母线, 第一温度传感器的第二端连接至主板, 用于检测空调 机组的冷媒温度和 /或冷冻水温度和 /或冷却水温度。 进一步地, 弱电负载还包括: 压力传感器, 压力传感器的第一端连接至第二直 流母线的正极母线, 压力传感器的第二端连接至主板, 用于检测空调机组的系统压 力。
进一步地, 弱电负载还包括: 第二温度传感器, 连接至主板, 由主板供电, 第 二温度传感器为热敏电阻温度传感器。
进一步地, 弱电负载还包括: 触摸屏, 触摸屏的第一端和第二端连接至主板, 用于传输数据, 触摸屏的第三端连接至第二直流母线的正极母线, 触摸屏的第四端 连接至第二直流母线的负极母线, 用于为触摸屏供电。 进一步地, 弱电负载还包括: 连接至主板, 并由主板供电的电子膨胀阀和 /或温 度保护器和 /或故障检测器。 进一步地, 弱电负载还包括: 指示灯, 第一端连接至第二直流母线的正极母线, 第二端连接至第二直流母线的负极母线。 进一步地, 第一直流母线的电压大于第二直流母线的电压。
进一步地, 第一直流母线的电压为 400V至 700V, 第二直流母线的电压为 5V 至 48V。 进一步地, 空调机组为离心式冷水机组或螺杆式冷水机组。 通过本发明, 采用依次连接的整流器、 第一直流母线和逆变器, 开关电源的输入 端与第一直流母线相连接, 开关电源的输出端与第二直流母线相连接, 开关电源通过
第二直流母线为弱电负载供电, 解决了相关技术中电源电路中不同类型电压之间的电 磁干扰比较严重的问题, 进而达到了提高电源电路的抗干扰性的效果。 附图说明 构成本申请的一部分的附图用来提供对本发明的进一步理解, 本发明的示意性实 施例及其说明用于解释本发明, 并不构成对本发明的不当限定。 在附图中: 图 1是根据本发明实施例的电源电路的示意图; 图 2是根据本发明第一实施例的空调机组电路结构的示意图; 以及 图 3是根据本发明第二实施例的空调机组电路结构的示意图。 具体实施方式 需要说明的是, 在不冲突的情况下, 本申请中的实施例及实施例中的特征可以相 互组合。 下面将参考附图并结合实施例来详细说明本发明。 需要说明的是, 本发明的说明书和权利要求书及上述附图中的术语 "第一"、 "第 二"等是用于区别类似的对象, 而不必用于描述特定的顺序或先后次序。 应该理解这 样使用的数据在适当情况下可以互换, 以便这里描述的本发明的实施例能够以除了在 这里图示或描述的那些以外的顺序实施。 此外, 术语 "包括"和 "具有" 以及他们的 任何变形, 意图在于覆盖不排他的包含。 根据本发明的实施例, 提供了一种电源电路, 用于为高压主回路提供交流电源和 为低压控制电路提供直流电源。 需要说明的是, 本发明实施例的电源电路可以用于变 频中央空调机组的电源电路, 空调机组可以为离心式冷水机组或者螺杆式冷水机组。 图 1是根据本发明第一实施例的电源电路的示意图。 如图 1所示, 该电源电路包括: 整流器 10、 逆变器 20、 开关电源 30、 第一直流 母线 40和第二直流母线 50。 整流器 10设置在主回路中, 依次与第一直流母线 40和逆变器 20相连通,该整流 器 10用于对市电进行整流以得到直流电压, 该直流电压为第一直流母线 40的电压, 其中, 市电可以为三相电, 例如, 市电可以是 AC380V或者 AC220V的电压, 这样, 整流器 10可以整流 AC380V或者 AC220V的电压为 DC400V至 DC700V的电压, 其
中, 该 DC400V至 DC700V的电压即为第一直流母线 40的电压。 需要说明的是, 在 本发明实施例中, 第一直流母线 40的电压可以为直流高电压, 第二直流母线 50的电 压可以为直流低电压, 即,第一直流母线 40的电压可以大于第二直流母线 50的电压。 逆变器 20设置在主回路中,通过第一直流母线 40连接至整流器 10, 该逆变器 20 用于将第一直流母线 40的直流电压进行逆变以得到交流电压,其中,该交流电压可以 驱动压缩机和 /或永磁同步电机。 开关电源 30的输入端与第一直流母线 40相连接,开关电源 30的输出端与第二直 流母线 50相连接,开关电源 30通过第二直流母线 50为弱电负载供电。需要说明的是, 在本发明实施例中, 开关电源 30可以为高压开关电源。 该开关电源 30用于将第一直 流母线 40的直流电压转变为第二直流母线 50的直流电压,例如,该开关电源 30可以 将第一直流母线 40的 DC400V至 DC700V的直流高电压转变为 DC48V或者 DC24V 或者 DC12V或者 DC5V等电压。 具体地, 开关电源 30的两个输入端分别连接至主回 路中第一直流母线 40的正极母线和第一直流母线 40的负极母线, 即连接至整流器 10 的两个输出端, 开关电源 30 的两个输出端分别连接至低压控制回路中第二直流母线 50的正极母线和第二直流母线 50的负极母线,开关电源 30用于通过第二直流母线 50 为低压控制回路的弱电负载提供直流电源,其中, 开关电源 30为低压控制回路提供的 直流电源的电压值的大小可以调节。 在该实施例的电源电路中, 由于整流器 10将 AC380V或者 AC220V的市电整流 成 DC400V至 DC700V的电压后, 开关电源 30可以通过降压的方式从主回路中的整 流器 10的高直流电压侧取电, 即从第一直流母线 40上取电, 并将高直流电压降低为 低直流电压以为低压控制回路提供电源电压, 因而, 低压控制回路中只有直流电压一 种类型的电压, 实现了低压控制回路的全直流化,从而降低了电源电路中的电磁干扰, 进而达到了提高电源电路的抗干扰性的效果。 图 2是根据本发明第一实施例的空调机组电路结构的示意图。 如图 2所示, 该实施例可以作为图 1所示实施例的优选实施方式, 该实施例的空 调机组除了包括第一实施例的电源电路, 即整流器 10、 逆变器 20、 开关电源 30、 第 一直流母线 40和第二直流母线 50之外, 还包括: 弱电负载 60和压缩机 70。 需要说明的是,本发明实施例的电源电路可以用于变频中央空调机组的电源电路, 空调机组可以为离心式冷水机组或者螺杆式冷水机组, 其中, 空调机组还可以包括永 磁同步电机。
电源电路 (即整流器 10、 逆变器 20、 开关电源 30、 第一直流母线 40和第二直流 母线 50) 的作用与第一实施例中的相同, 在此不再赘述。 弱电负载 60可以包括用于控制空调机组的主板、触摸屏、一个或者多个温度传感 器、 压力传感器、 电子膨胀阀、 温度保护器、 故障检测器、 指示灯和其他弱电负载的 等。 压缩机 70设置在主回路中, 压缩机 70连接至逆变器 20。 具体地, 压缩机 70的 输入端连接至逆变器 20的交流输出端, 这样, 逆变器 20逆变得到的交流电压可以作 为压缩机 70的驱动电压。 图 3是根据本发明第二实施例的空调机组电路结构的示意图。 如图 3所示, 该实施例可以作为图 1所示实施例的优选实施方式, 该实施例的空 调机组除了包括第一实施例的电源电路, 即整流器 10、 逆变器 20、 开关电源 30、 第 一直流母线 40和第二直流母线 50之外, 还包括: 第一开关 80和第二开关 90, 以及 主板 601、 第一温度传感器 602、 压力传感器 603、 第二温度传感器 604、 触摸屏 605、 电子膨胀阀 606、 温度保护器 607、 故障检测器 608、 指示灯 609和其他弱电负载 610 等弱电负载 60。 电源电路 (即整流器 10、 逆变器 20、 开关电源 30、 第一直流母线 40和第二直流 母线 50) 的作用与第一实施例中的相同, 在此不再赘述。 需要说明的是, 在本发明实施例中, 第一直流母线 40的电压可以为直流高电压, 第二直流母线 50的电压可以为直流低电压, SP, 第一直流母线 40的电压可以大于第 二直流母线 50的电压。 其中, 第一直流母线的电压可以为 400V至 700V, 第二直流 母线的电压可以为 5V至 48V。 第一开关 80设置在第二直流母线的正极母线上。 第二开关 90设置在第二直流母 线的负极母线上。 第一开关 80和第二开关 90用于控制低压控制回路的导通与断开, 需要说明的是, 在本发明实施例中, 可以只采用一个开关来控制低压控制回路的导通 与断开。 具体地, 当第一开关 80和第二开关 90同时闭合时, 低压控制回路为导通状 态, 当第一开关 80闭合、 第二开关 90断开时, 低压控制回路为断开状态, 当第一开 关 80断开、 第二开关 90闭合时, 低压控制回路为断开状态。 在本发明实施例中,主板 601连接至第二直流母线 50。主板 601上具有微处理器、 存储器、 数字处理器和控制器等, 用于控制第一温度传感器 602和压力传感器 603等
弱电负载 60执行检测, 并对检测结果进行存储等数据处理。主板 601还可以为控制器 件提供电源。 第一温度传感器 602的第一端连接至第一开关 80的第二端和主板 601的输入端, 即第一温度传感器 602的第一端连接至第二直流母线 50, 第一温度传感 602的第二端 连接至主板 601, 用于检测空调机组中的冷媒温度和 /或水温。 其中, 第一温度传感器 602从开关电源 30取电, 并将检测到的温度值传送至主板。 第一温度传感器 602可以 包括一个或者多个, 该一个或者多个第一温度传感器 602用于检测变频中央空调机组 中对温度检测精度需求较高的环境, 如检测压缩机的吸、 排气温度, 冷凝器和 /或蒸发 器的进出水温度等。 优选地, 第一温度传感器 602为铂电阻温度传感器。 压力传感器 603的第一端连接至第一开关 80的第二端、主板 601的输入端和第一 温度传感器 602的第一端, 压力传感器 603的第二端连接至主板 602, 用于检测空调 机组的系统压力。其中, 压力传感器 603从开关电源 30取电, 并将检测到的压力值传 送至主板 601。 压力传感器 603可以包括一个或者多个, 该一个或者多个压力传感器 603可以检测变频中央空调机组的压缩机吸、 排气压力、 空调机组各处管道和 /或压力 容器的压力。 第二温度传感器 604设置在低压控制回路中, 并且连接至主板 601。 其中, 第二 温度传感器 604从主板 601取电。 第二温度传感器 604可以包括一个或者多个, 该一 个或者多个第二温度传感器 604可以检测变频中央空调机组中对温度检测精度需求不 高的环境, 如润滑油温度检测、 环境温度检测等。 优选地, 第二温度传感器 604为热 敏电阻温度传感器。 触摸屏 605设置在低压控制回路中, 并且该触摸屏 605的第一端和第二端连接至 主板 601, 该触摸屏 605的第三端连接至第二直流母线 50的正极母线, 该触摸屏 605 的第三端连接至第二直流母线 50的负极母线。其中,该触摸屏 605的第一端和第二端 作为数据线与主板 601相连接, 从而与主板 601之间进行数据通讯。 例如, 可以通过 该触摸屏 605设置空调机组的温度, 同时, 该触摸屏 605可以通过其第一端和第二端 将温度设置信息发送给主板 601上的微处理器。 主板 601上的微处理器也可以通过第 一端和第二端将控制信息发送给该触摸屏 605。 该触摸屏 605也可以用来显示温度、 压力、 时间等信息。 该触摸屏 605通过触摸屏 605的第三端和触摸屏 605的第四端从 主板 601取电。 电子膨胀阀 606设置在低压控制回路中, 并且连接至主板 601, 用于调节蒸发器 的供液量。 其中, 该电子膨胀阀 606从主板 601取电。
温度保护器 607设置在低压控制回路中, 并且连接至主板 601, 用于保护空调机 组在一定的温度范围之内工作。 其中, 该温度保护器 607从主板 601取电。 故障检测器 608设置在低压控制回路中, 并且连接至主板 601。 故障检测器 608 可以检测空调机组的故障信息, 并将故障信息发送给主板 601上的微处理器。 该主板 601上的微处理器在接收到故障信息后, 可以将该故障信息显示在触摸屏 605上, 以 通知维修人员进行维修。 其中, 该故障检测器 608从主板 601取电。 主板 601上设有电源管理模块, 用于为第二温度传感器 603、 电子膨胀阀 606、温 度保护器 607和故障检测器 608提供合适的电压。 指示灯 609设置在低压控制回路中,其第一端连接至第一开关 80的第二端, 即第 一端连接至第二直流母线 50的正极母线, 指示灯 609的第二端连接至第二开关 90的 第二端, 即第二端连接至第二直流母线 50的负极母线。指示灯 609可以为一个或者多 个, 并且该一个或者多个指示灯 609用于指示空调机组的工作状态和故障状态等。 其他弱电负载 610设置在低压控制回路中, 并且其他弱电负载 610的第一端连接 至第一开关 80的第二端, 即第一端连接至第二直流母线 50的正极母线, 第二端连接 至第二开关 80的第二端, 即第二端连接至第二直流母线 50的负极母线。 从以上的描述中,可以看出,在该实施例的空调机组中,由于整流器 10将 AC380V 或者 AC220V的市电整流成 DC400V至 DC700V的电压后, 开关电源 30可以通过降 压的方式从主回路中的整流器 10的高直流电压侧取电,并将高直流电压降低为低直流 电压以为低压控制回路提供电源电压, 因而, 低压控制回路中只有直流电压一种类型 的电压, 实现了低压控制回路的全直流化, 从而降低了电源电路中的电磁干扰, 进而 达到了提高电源电路的抗干扰性、 电磁兼容性及安全性的效果。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领域的技 术人员来说, 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内, 所作的 任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。
Claims
1. 一种电源电路, 包括依次连接的整流器、第一直流母线和逆变器, 其特征在于, 还包括: 开关电源, 所述开关电源的输入端与所述第一直流母线相连接, 所述开关 电源的输出端与第二直流母线相连接, 所述开关电源通过所述第二直流母线为 弱电负载供电。
2. 根据权利要求 1所述的电源电路, 其特征在于, 还包括:
第一开关, 设置在所述第二直流母线的正极母线上; 和 /或 第二开关, 设置在所述第二直流母线的负极母线上。
3. 根据权利要求 1或 2所述的电源电路, 其特征在于, 所述第一直流母线的电压 大于第二直流母线的电压。
4. 一种空调机组, 其特征在于, 包括: 电源电路, 其中, 所述电源电路包括开关电源和依次连接的整流器、 第一 直流母线和逆变器, 所述开关电源的输入端与所述第一直流母线相连接, 所述 开关电源的输出端与第二直流母线相连接, 所述开关电源通过所述第二直流母 线为弱电负载供电; 以及
通过所述逆变器供电的压缩机和 /或永磁同步电机。
5. 根据权利要求 4所述的空调机组, 其特征在于, 所述电源电路还包括: 第一开关, 设置在所述第二直流母线的正极母线上; 和 /或 第二开关, 设置在所述第二直流母线的负极母线上。
6. 根据权利要求 4所述的空调机组, 其特征在于, 所述弱电负载包括: 用于控制 所述空调机组的主板, 所述主板与所述第二直流母线相连接。
7. 根据权利要求 6所述的空调机组, 其特征在于, 所述弱电负载还包括: 第一温度传感器, 所述第一温度传感器的第一端连接至所述第二直流母线 的正极母线, 所述第一温度传感器的第二端连接至所述主板, 用于检测所述空 调机组的冷媒温度和 /或冷冻水温度和 /或冷却水温度。
8. 根据权利要求 6所述的空调机组, 其特征在于, 所述弱电负载还包括: 压力传感器, 所述压力传感器的第一端连接至所述第二直流母线的正极母 线, 所述压力传感器的第二端连接至所述主板, 用于检测所述空调机组的系统 压力。
9. 根据权利要求 6所述的空调机组, 其特征在于, 所述弱电负载还包括: 第二温 度传感器, 连接至所述主板, 由所述主板供电, 所述第二温度传感器为热敏电 阻温度传感器。
10. 根据权利要求 6所述的空调机组, 其特征在于, 所述弱电负载还包括: 触摸屏, 所述触摸屏的第一端和第二端连接至所述主板, 用于传输数据, 所述触摸屏的 第三端连接至所述第二直流母线的正极母线, 所述触摸屏的第四端连接至所述 第二直流母线的负极母线, 用于为所述触摸屏供电。
11. 根据权利要求 6所述的空调机组, 其特征在于, 所述弱电负载还包括: 连接至 所述主板, 并由所述主板供电的电子膨胀阀和 /或温度保护器和 /或故障检测器。
12. 根据权利要求 4所述的空调机组, 其特征在于, 所述弱电负载还包括: 指示灯, 第一端连接至所述第二直流母线的正极母线, 第二端连接至所述第二直流母线 的负极母线。
13. 根据权利要求 4至 12任一项所述的空调机组,其特征在于,所述第一直流母线 的电压大于第二直流母线的电压。
14. 根据权利要求 13 所述的空调机组, 其特征在于, 所述第一直流母线的电压为 400V至 700V, 第二直流母线的电压为 5 V至 48V。
15. 根据权利要求 13所述的空调机组,其特征在于,所述空调机组为离心式冷水机 组或螺杆式冷水机组。
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