WO2018113513A1 - 电压转换装置 - Google Patents
电压转换装置 Download PDFInfo
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- WO2018113513A1 WO2018113513A1 PCT/CN2017/114578 CN2017114578W WO2018113513A1 WO 2018113513 A1 WO2018113513 A1 WO 2018113513A1 CN 2017114578 W CN2017114578 W CN 2017114578W WO 2018113513 A1 WO2018113513 A1 WO 2018113513A1
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- voltage
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- switching element
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- 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
- H02M1/123—Suppression of common mode voltage or current
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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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/125—Avoiding or suppressing excessive transient voltages or currents
Definitions
- the present invention relates to the field of voltage conversion technologies, and in particular, to a voltage conversion device.
- the voltage conversion device converts the input AC voltage into a DC voltage and outputs it to the consumer.
- the voltage conversion device can be, for example, an electronic ballast that converts the grid voltage in the form of an alternating voltage into a direct voltage and outputs it to a consumer such as a light emitting diode (LED).
- LED light emitting diode
- the voltage conversion device may have a plurality of voltage connectors, and the AC voltage is fed from the different voltage terminals to the voltage conversion device, and the DC voltage outputted by the voltage conversion device is different.
- one voltage conversion device can be applied to the electric appliances of different powers.
- Patent Document 1 (CN101982017A) discloses a voltage conversion device, and FIG. 1 is a schematic diagram of a voltage conversion device of Patent Document 1. As shown in FIG. 1, the voltage conversion device 1 has voltage connectors 2, 3, and the AC voltage fed from the voltage connector 2 or 3 sequentially passes through the electromagnetic filter 4, the bridge rectifier 5, the DC voltage intermediate circuit 6, and the half bridge inverse. The processing of the transformer 7 and the resonance circuit 8 is a DC voltage, and is output from the output terminals 9, 10 to the electric device 11.
- the voltage conversion device 1 further has a transformer T, a resistor R and a control unit 12, wherein when an alternating voltage is fed from the voltage terminal 3, the primary coil W of the transformer T flows a current, thereby causing the secondary coil An induced current is generated in W', and a voltage difference is generated across the resistor R.
- the control unit 12 can determine that the AC voltage is fed from the voltage connector 3 and will be halfway.
- the bridge inverter 7 outputs a control signal corresponding to the voltage connector 3 to control the two switches in the half bridge inverter 7 to be alternately turned on, so that the voltage conversion device 1 outputs a corresponding DC voltage; otherwise, the control unit 12
- a control signal corresponding to the voltage connector 2 is output to the half bridge inverter 7 to control the half bridge inverse.
- the two switches in the transformer 7 are alternately turned on, thereby causing the voltage conversion device 1 to output a corresponding DC voltage.
- the embodiment of the present application provides a voltage conversion device capable of determining a voltage connector for feeding through a simple circuit and performing corresponding control to output a corresponding DC voltage.
- a voltage conversion device for converting an input AC voltage into a DC voltage or current, the voltage conversion device having at least a first voltage connector and a second voltage connector, and the AC voltage is via an AC voltage The first voltage connector or the second voltage connector is fed to the voltage conversion device,
- the voltage conversion device further includes:
- An electromagnetic filtering unit for electromagnetically filtering an input alternating voltage
- a conversion unit configured to convert the electromagnetically filtered voltage of the electromagnetic filtering unit into a direct current voltage or current and output the same;
- a determining unit configured to determine which one of the first voltage connector and the second voltage connector is fed to the voltage conversion device
- control unit configured to control the conversion unit according to a determination result of the determining unit, so that a DC voltage or current output by the conversion unit corresponds to the determination result
- the judging unit is electrically connected to the first voltage connector and the second voltage connector.
- the determining unit has a first switching element Q1 and a second switching element Q2,
- the first switching element Q1 is periodically turned on, and the second switching element Q2 is kept turned on.
- the determining unit further has a first diode D1 and a second diode D2, and the first diode D1 and the second diode D2 are connected in parallel to the first voltage connector and the first Between two voltage connectors,
- the first diode D1 and the second diode D2 are both turned off;
- the first diode D1 and the second diode D2 are alternately conducting in accordance with the flow of the alternating current.
- the first switching element Q1 is a bipolar transistor, and a base of the bipolar transistor is electrically connected to the second voltage connector via a first resistor R1.
- the emitter of the bipolar transistor is electrically connected to the first voltage connector.
- the collector of the bipolar transistor is grounded via the second resistor R4.
- the determining unit further has a capacitor C1 that enables the capacitor C1 to be fed to the voltage conversion device via the second voltage connector. The voltage difference is maintained across the two resistors R4.
- the second switching element Q2 is a metal oxide semiconductor field effect (MOS-FET) transistor, a gate of the metal oxide semiconductor field effect (MOS-FET) transistor And electrically connected to the non-ground end of the second resistor R4.
- MOS-FET metal oxide semiconductor field effect
- MOS-FET metal oxide semiconductor field effect
- the beneficial effects of the embodiments of the present application are that the voltage connector for feeding can be judged by a simple circuit and correspondingly controlled to output a corresponding DC voltage or current.
- Patent Document 1 is a schematic diagram of a voltage conversion device of Patent Document 1;
- FIG. 2 is a schematic diagram of a voltage conversion device according to Embodiment 1 of the present application.
- FIG. 3 is a schematic diagram of a determining unit according to Embodiment 1 of the present application.
- Embodiment 1 of the present application provides a voltage conversion device for converting an input AC voltage into a DC voltage or current and outputting it.
- the DC voltage or current outputted by the voltage conversion device can be supplied to the consumer, such as a light emitting diode (LED) or the like.
- LED light emitting diode
- Fig. 2 is a schematic view of the voltage converting device of the embodiment.
- the voltage conversion device 200 may include a first voltage connector n1, a second voltage connector n2, an electromagnetic filter unit 201, a conversion unit 202, a determination unit 203, and a control unit 204.
- the alternating voltage can be fed into the voltage via the first voltage connector n1 or the second voltage connector n2.
- the conversion device 200; the electromagnetic filter unit 201 is configured to perform electromagnetic filtering on the input AC voltage; the conversion unit 202 is configured to convert the electromagnetically filtered voltage of the electromagnetic filter unit 201 into a DC voltage or current and output; the determining unit 203 is configured to determine The AC voltage is fed to the voltage conversion device 200 via which of the first voltage connector n1 and the second voltage connector n2; the control unit 204 controls the conversion unit 202 according to the determination result of the determination unit 203, so that the conversion unit 202 outputs The DC voltage or current corresponds to the judgment result.
- the determining unit 203 is electrically connected to both the first voltage connector n1 and the second voltage connector n2.
- the determining unit 203 is electrically connected to the first voltage connector n1 and the second voltage connector n2, the voltage connector for feeding can be determined by a simple circuit, and corresponding control is performed to Output the corresponding DC voltage or current.
- This embodiment can reduce the cost with respect to the prior art.
- the conversion unit 202 may have the same structure as the prior art.
- the conversion unit 202 may have a bridge rectifier, a DC voltage intermediate circuit, a half bridge inverter, a resonance circuit, etc., wherein the half bridge inverse
- the converter may have two switches that are alternately turned on, and the control unit 204 causes the conversion unit 202 to output a different DC voltage or current by controlling the duty ratio at which the two switches are alternately turned on.
- the conversion unit 202 can also have other structures, and can refer to the prior art, and details are not described in this embodiment.
- control unit 204 can perform control according to the determination result of the determination unit 203.
- the control unit 204 can be connected to the determination unit 203 to receive the output signal of the determination unit 203, and based on the output signal of the determination unit 203.
- the control unit 204 may be an integrated circuit (IC), such as an application specific integrated circuit or a microprocessor or the like.
- FIG. 3 is a schematic diagram of the determination unit 203 of the present embodiment.
- the judging unit 203 may have a first switching element Q1 and a second switching element Q2.
- the first switching element Q1 and the second switching element Q2 are both turned off, and the AC voltage is fed to the voltage conversion device via the second voltage connector n2.
- the first switching element Q1 is periodically turned on, and the second switching element Q2 is kept turned on.
- the determining unit 203 may further have a first diode D1 and a second diode D2, and the first diode D1 and the second diode D2 may be connected in parallel to the first voltage connector n1 and the first Between the two voltage connectors n2.
- the first diode D1 and the second diode D2 are both turned off; the AC voltage is fed to the voltage conversion device 200 via the second voltage connector n2.
- the first diode D1 and the second diode D2 are alternately conducting in accordance with the flow of the alternating current.
- the first switching element Q1 may be a bipolar transistor such as a PNP type bipolar transistor.
- the base B of the bipolar transistor can be electrically connected to the second voltage connector n2 via the first resistor R1, and the emitter E of the bipolar transistor can be electrically connected to the first voltage connector n1.
- the collector C of the bipolar transistor can be grounded via the second resistor R4.
- the voltage difference across the second resistor R4 can turn on the second switching element Q2.
- the second switching element Q2 may be a metal oxide semiconductor field effect (MOS-FET) transistor, and the gate of the second switching element Q2 may be connected to the ungrounded end of the second resistor R4. Electrical connection.
- the drain of the second switching element Q2 may be connected to the control unit 204.
- MOS-FET metal oxide semiconductor field effect
- the determining unit 203 may further have a capacitor C1.
- the capacitor C1 When the AC voltage is fed into the voltage conversion device via the second voltage connector, the capacitor C1 maintains the two ends of the second resistor R4. The voltage difference is described.
- the capacitor C1 can be connected in parallel with the second resistor R4.
- the determining unit 203 may further have a third resistor R2, which may be connected between the collector of the first switching element Q1 and the second resistor R4.
- judging units 203 may be provided to judge whether or not the AC voltage is fed from these voltage terminals.
- the first diode D1 and the second diode D2 are both turned off, that is, the base of the first switching element Q1 has no current flowing branch. Thereby, the first switching element Q1 is turned off, whereby the second switching element Q2 is turned off.
- the control unit 204 detects the OFF of the second switching element Q2, and performs control corresponding to the case where the AC voltage is fed to the voltage conversion device 200 via the first voltage terminal n1.
- the determination unit 203 operates as follows :
- the first diode D1 is turned on, and the voltage difference between the emitter and the base of the first switching element Q1 is clamped by the first diode D1, thereby making the first switching element Q1 Turning on during the half cycle in which D1 is turned on, and flowing a current on the first switching element Q1, charging the capacitor C1 via the third resistor R2, storing a charge in the capacitor C1, and generating a voltage across the second resistor R4.
- the control unit 204 detecting that the second switching element Q2 is turned on, and performing control corresponding to a case where the AC voltage is fed to the voltage conversion device 200 via the second voltage connector n2;
- the second diode D2 is turned on to provide a path for the alternating voltage to enter the electromagnetic filtering unit 201 via the second voltage interface n2, during which the first switching element Q1 Reverse biasing is turned off, C1 is not charged, but since C1 stores a charge, the voltage difference across the second resistor R4 is maintained, so that the second switching element Q2 is still turned on during the other half cycle, that is, The second switching element Q2 is kept turned on during the complete period, and the first switching element Q1 is turned on only during the half cycle in which the first diode D1 is conducting, so the first switching element Q1 is periodically turned on. .
- N1 and N2 may be respectively a neutral line connected to an alternating current power source
- L may be a live line connected to an alternating current power source
- the determining unit 203 is electrically connected to the first voltage connector n1 and the second voltage connector n2, the voltage connector for feeding can be determined by a simple circuit, and corresponding control is performed to Output the corresponding DC voltage and current.
- This embodiment can reduce the cost with respect to the prior art.
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Abstract
一种电压转换装置(200),用于将输入的交流电压转换为直流电压或电流,至少具有第一电压接头(n1)和第二电压接头(n2),交流电压经由第一电压接头(n1)或第二电压接头(n2)馈入电压转换装置(200),电压转换装置(200)还包括:电磁滤波单元(201);转换单元(202);判断单元(203),其用于判断交流电压经由第一电压接头(n1)和第二电压接头(n2)中的哪一个馈入电压转换装置(200);控制单元(204),其根据判断单元(203)的判断结果,对转换单元(202)进行控制,以使得转换单元(202)输出的直流电压或电流与判断结果对应,其中,判断单元(203)与第一电压接头(n1)和第二电压接头(n2)都电连接。该电压转换装置(200)能够通过简单的电路来判断用于馈电的电压接头,并进行相应的控制,以输出相应的直流电压或电流。
Description
本发明涉及电压转换技术领域,尤其涉及一种电压转换装置。
电压转换装置能够将输入的交流电压转换为直流电压,并输出给用电器。在一个典型的使用场景中,电压转换装置例如可以是电子镇流器,其可以将交流电压形式的电网电压转换为直流电压,并输出给发光二极管(LED)等用电器。
电压转换装置可以具有多个电压接头,从不同的电压接头向电压转换装置馈入交流电压,电压转换装置输出的直流电压不同,由此,一个电压转换装置能够适用于不同功率的用电器。
专利文件1(CN101982017A)公开了一种电压转换装置,图1是专利文件1的电压转换装置的一个示意图。如图1所示,该电压转换装置1具有电压接头2、3,从电压接头2或3馈入的交流电压依次经过电磁滤波器4、桥式整流器5、直流电压中间电路6、半桥逆变器7以及谐振电路8的处理,成为直流电压,并从输出端子9、10输出到用电设备11。
在图1中,电压转换装置1还具有变压器T、电阻R和控制单元12,其中,当从电压接头3馈入交流电压时,变压器T的初级线圈W会流过电流,从而使次级线圈W’中产生感应电流,并在电阻R两端产生电压差,控制单元12在检测到电阻R两端产生电压差的情况下,可以判断为从电压接头3馈入交流电压,并且会向半桥逆变器7输出与电压接头3对应的控制信号,以控制半桥逆变器7中的两个开关交替导通,从而使电压转换装置1输出相应的直流电压;反之,控制单元12在检测到电阻R两端没有产生电压差的情况下,可以判断为从电压接头2馈入交流电压,并且会向半桥逆变器7输出与电压接头2对应的控制信号,以控制半桥逆变器7中的两个开关交替导通,从而使电压转换装置1输出相应的直流电压。
在现有技术中,还可以采用其他的方式来使电压转换装置输出不同的直流电压电
流,例如,在电压转换装置的次级侧(secondary side)进行切换控制,或者在电压转换装置的初级侧(primary side)进行切换控制等。
应该注意,上面对技术背景的介绍只是为了方便对本申请的技术方案进行清楚、完整的说明,并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本申请的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。
发明内容
本申请的发明人发现,现有技术中,为了使电压转换装置输出不同的直流电,通常采用的控制电路都较为复杂,例如:专利文件1的电路结构比较复杂;在通过电压转换装置的次级侧进行切换控制的方案中,需要将切换状态反馈给初级侧,增加了电路复杂度;在通过电压转换装置的初级侧进行切换控制的方案中,需要在初级侧设置多双向端子(two ways terminal)和跳线(jumper),也增加了电路的复杂度。
本申请实施例提供一种电压转换装置,能够通过简单的电路来判断用于馈电的电压接头,并进行相应的控制,以输出相应的直流电压。
根据本申请实施例的一个方面,提供一种电压转换装置,用于将输入的交流电压转换为直流电压或电流,所述电压转换装置至少具有第一电压接头和第二电压接头,交流电压经由所述第一电压接头或所述第二电压接头馈入所述电压转换装置,
所述电压转换装置还包括:
电磁滤波单元,其用于对输入的交流电压进行电磁滤波;
转换单元,其用于将所述电磁滤波单元进行电磁滤波后的电压转换为直流电压或电流并输出;
判断单元,其用于判断交流电压经由所述第一电压接头和所述第二电压接头中的哪一个馈入所述电压转换装置;以及
控制单元,其根据所述判断单元的判断结果,对所述转换单元进行控制,以使得所述转换单元输出的直流电压或电流与所述判断结果对应,
其中,所述判断单元与所述第一电压接头和所述第二电压接头都电连接。
根据本申请实施例的另一个方面,其中,
所述判断单元具有第一开关元件Q1和第二开关元件Q2,
在交流电压经由所述第一电压接头馈入所述电压转换装置的情况下,所述第一开
关元件Q1和所述第二开关元件Q2均关断;并且
在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述第一开关元件Q1周期性导通,所述第二开关元件Q2保持导通。
根据本申请实施例的另一个方面,其中,
所述判断单元还具有第一二极管D1和第二二极管D2,所述第一二极管D1和所述第二二极管D2并联连接于所述第一电压接头和所述第二电压接头之间,
在交流电压经由所述第一电压接头馈入所述电压转换装置的情况下,所述第一二极管D1和所述第二二极管D2均截止;并且
在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述第一二极管D1和第二二极管D2根据交流电的流向轮流正向导通。
根据本申请实施例的另一个方面,其中,所述第一开关元件Q1是双极型晶体管,所述双极型晶体管的基极经由第一电阻R1电连接于所述第二电压接头,所述双极型晶体管的发射极电连接于所述第一电压接头。
根据本申请实施例的另一个方面,其中,所述双极型晶体管的集电极经由第二电阻R4接地。
根据本申请实施例的另一个方面,其中,在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述第二电阻R4两端的电压差使所述第二开关元件Q2导通。
根据本申请实施例的另一个方面,其中,所述判断单元还具有电容器C1,在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述电容器C1使所述第二电阻R4两端保持所述电压差。
根据本申请实施例的另一个方面,其中,所述第二开关元件Q2是金属氧化物半导体场效应(MOS-FET)晶体管,所述金属氧化物半导体场效应(MOS-FET)晶体管的栅极与所述第二电阻R4的非接地一端电连接。
本申请实施例的有益效果在于:能够通过简单的电路来判断用于馈电的电压接头,并进行相应的控制,以输出相应的直流电压或电流。
参照后文的说明和附图,详细公开了本发明的特定实施方式,指明了本发明的原理可以被采用的方式。应该理解,本发明的实施方式在范围上并不因而受到限制。在所附权利要求的精神和条款的范围内,本发明的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和/或示出的特征可以以相同或类似的方式在一个或更多个其它实施方式中使用,与其它实施方式中的特征相组合,或替代其它实施方式中的特征。
应该强调,术语“包括/包含”在本文使用时指特征、整件、步骤或组件的存在,但并不排除一个或更多个其它特征、整件、步骤或组件的存在或附加。
所包括的附图用来提供对本发明实施例的进一步的理解,其构成了说明书的一部分,用于例示本发明的实施方式,并与文字描述一起来阐释本发明的原理。显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。在附图中:
图1是专利文件1的电压转换装置的一个示意图;
图2是本申请实施例1的电压转换装置的一个示意图;
图3是本申请实施例1的判断单元的一个示意图。
参照附图,通过下面的说明书,本发明的前述以及其它特征将变得明显。在说明书和附图中,具体公开了本发明的特定实施方式,其表明了其中可以采用本发明的原则的部分实施方式,应了解的是,本发明不限于所描述的实施方式,相反,本发明包括落入所附权利要求的范围内的全部修改、变型以及等同物。
实施例1
本申请实施例1提供一种电压转换装置,用于将输入的交流电压转换为直流电压或电流并输出。在本实施例中,电压转换装所输出的直流电压或电流可以被提供给用电器,该用电器例如是发光二极管(LED)等。
图2是本实施例的电压转换装置的一个示意图。如图2所示,该电压转换装置200可以包括:第一电压接头n1,第二电压接头n2,电磁滤波单元201,转换单元202,判断单元203,以及控制单元204。
在本实施例中,交流电压可以经由第一电压接头n1或第二电压接头n2馈入电压
转换装置200;电磁滤波单元201用于对输入的交流电压进行电磁滤波;转换单元202用于将电磁滤波单元201进行电磁滤波后的电压转换为直流电压或电流并输出;判断单元203用于判断交流电压经由第一电压接头n1和第二电压接头n2中的哪一个馈入电压转换装置200;控制单元204根据判断单元203的判断结果,对转换单元202进行控制,以使得转换单元202输出的直流电压或电流与判断结果对应。在本实施例中,判断单元203与第一电压接头n1和第二电压接头n2都电连接。
在本实施例中,由于判断单元203与第一电压接头n1和第二电压接头n2都电连接,因此,能够通过简单的电路来判断用于馈电的电压接头,并进行相应的控制,以输出相应的直流电压或电流。相对于现有技术,本实施例能够降低成本。
在本实施例中,关于电磁滤波单元201的说明,可以参考现有技术。
在本实施例中,转换单元202可以具有与现有技术相同的结构,例如,转换单元202可以具有桥式整流器、直流电压中间电路、半桥逆变器以及谐振电路等,其中,半桥逆变器中可以具有两个交替导通的开关,控制单元204通过控制该两个开关交替导通的占空比,使转换单元202输出不同的直流电压或电流。此外,转换单元202也可以有其他的结构,可以参考现有技术,本实施例不再赘述。
在本实施例中,控制单元204可以根据判断单元203的判断结果进行控制,例如,控制单元204可以与判断单元203连接,以接收判断单元203的输出信号,并基于判断单元203的输出信号进行相应的控制。在本实施例中,控制单元204可以是集成电路(IC),例如,专用集成电路或微处理器等。
图3是本实施例的判断单元203的一个示意图。
如图3所示,判断单元203可以具有第一开关元件Q1和第二开关元件Q2。其中,在交流电压经由第一电压接头n1馈入电压转换装置200的情况下,第一开关元件Q1和第二开关元件Q2均关断,在交流电压经由第二电压接头n2馈入电压转换装置200的情况下,第一开关元件Q1周期性导通,第二开关元件Q2保持导通。
如图3所示,判断单元203还可以具有第一二极管D1和第二二极管D2,第一二极管D1和第二二极管D2可以并联连接于第一电压接头n1和第二电压接头n2之间。在交流电压经由第一电压接头n1馈入电压转换装置200的情况下,第一二极管D1和第二二极管D2均截止;在交流电压经由第二电压接头n2馈入电压转换装置200的情况下,第一二极管D1和第二二极管D2根据交流电的流向轮流正向导通。
在本实施例中,如图3所示,第一开关元件Q1可以是双极型晶体管,例如PNP型双极型晶体管。该双极型晶体管的基极B可以经由第一电阻R1电连接于第二电压接头n2,该双极型晶体管的发射极E可以电连接于第一电压接头n1。
如图3所示,该双极型晶体管的集电极C可以经由第二电阻R4接地。在交流电压经由第二电压接头n1馈入电压转换装置200的情况下,第二电阻R4两端的电压差可以使第二开关元件Q2导通。
在本实施例中,如图3所示,第二开关元件Q2可以是金属氧化物半导体场效应(MOS-FET)晶体管,第二开关元件Q2的栅极可以与第二电阻R4的非接地一端电连接。第二开关元件Q2的漏极可以与控制单元204连接。
此外,如图3所示,该判断单元203还可以具有电容器C1,在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,电容器C1使第二电阻R4两端保持所述电压差。例如,该电容器C1可以与第二电阻R4并联。
此外,如图3所示,该判断单元203还可以具有第三电阻R2,该第三电阻R2可以连接于第一开关元件Q1的集电极与第二电阻R4之间。
此外,在本实施例中,可以具有更多的电压接头,并且可以设置更多的判断单元203来判断是否从这些电压接头馈入交流电压。
下面,说明判断单元203的动作。
在交流电压经由第一电压接头n1馈入电压转换装置200的情况下,第一二极管D1和第二二极管D2均截止,即,第一开关元件Q1的基极无电流流通支路,从而使第一开关元件Q1截止,由此,第二开关元件Q2关断。控制单元204检测到第二开关元件Q2的截止,进行与交流电压经由第一电压接头n1馈入电压转换装置200的情况相对应的控制。
在交流电压经由第二电压接头n2馈入电压转换装置200的情况下,第一二极管D1和第二二极管D2根据交流流通方向而轮流导通,由此,该判断单元203动作如下:
在交流电的某半个周期,第一二极管D1导通,第一开关元件Q1的发射极和基极之间的电压差被第一二极管D1钳位,从而使第一开关元件Q1在D1导通的该半个周期内导通,并在第一开关元件Q1上流过电流,经第三电阻R2对电容器C1充电,在电容器C1中存储电荷,并在第二电阻R4两端产生电压差,该电压差被施加于第二开关元件Q2的栅极,使第二开关元件Q2在交流电的该半个周期内保持导通,控制单元
204检测到第二开关元件Q2导通,进行与交流电压经由第二电压接头n2馈入电压转换装置200的情况相对应的控制;
在交流电的另外半个周期内,第二二极管D2导通,从而提供使交流电压经由第二电压接口n2进入电磁滤波单元201的通路,在该另外半个周期内,第一开关元件Q1反向偏置而截至,不对C1充电,但由于C1储存有电荷,使第二电阻R4两端的电压差得以保持,从而第二开关元件Q2在该另外半个周期内仍然导通,即,使第二开关元件Q2在完整周期内保持导通,而第一开关元件Q1仅在第一二极管D1正向导通的那半个周期内导通,所以第一开关元件Q1是周期性导通。
此外,在图3中,N1、N2可以分别是与交流电源连接的零线,L可以是与交流电源连接的火线。
在本实施例中,由于判断单元203与第一电压接头n1和第二电压接头n2都电连接,因此,能够通过简单的电路来判断用于馈电的电压接头,并进行相应的控制,以输出相应的直流电压和电流。相对于现有技术,本实施例能够降低成本。
以上结合具体的实施方式对本申请进行了描述,但本领域技术人员应该清楚,这些描述都是示例性的,并不是对本申请保护范围的限制。本领域技术人员可以根据本申请的精神和原理对本申请做出各种变型和修改,这些变型和修改也在本申请的范围内。
Claims (8)
- 一种电压转换装置,用于将输入的交流电压转换为直流电压或电流,所述电压转换装置至少具有第一电压接头和第二电压接头,交流电压经由所述第一电压接头或所述第二电压接头馈入所述电压转换装置,所述电压转换装置还包括:电磁滤波单元,其用于对输入的交流电压进行电磁滤波;转换单元,其用于将所述电磁滤波单元进行电磁滤波后的电压转换为直流电压或电流并输出;判断单元,其用于判断交流电压经由所述第一电压接头和所述第二电压接头中的哪一个馈入所述电压转换装置;以及控制单元,其根据所述判断单元的判断结果,对所述转换单元进行控制,以使得所述转换单元输出的直流电压或电流与所述判断结果对应,其中,所述判断单元与所述第一电压接头和所述第二电压接头都电连接。
- 如权利要求1所述的电压转换装置,其中,所述判断单元具有第一开关元件Q1和第二开关元件Q2,在交流电压经由所述第一电压接头馈入所述电压转换装置的情况下,所述第一开关元件Q1和所述第二开关元件Q2均关断;并且在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述第一开关元件Q1为周期性导通,所述第二开关元件Q2保持导通。
- 如权利要求2所述的电压转换装置,其中,所述判断单元还具有第一二极管D1和第二二极管D2,所述第一二极管D1和所述第二二极管D2并联连接于所述第一电压接头和所述第二电压接头之间,在交流电压经由所述第一电压接头馈入所述电压转换装置的情况下,所述第一二极管D1和所述第二二极管D2均截止;并且在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述第一二极管D1和所述第二二极管D2根据交流电的流向轮流正向导通。
- 如权利要求3所述的电压转换装置,其中,所述第一开关元件Q1是双极型晶体管,所述双极型晶体管的基极经由第一电阻 R1电连接于所述第二电压接头,所述双极型晶体管的发射极电连接于所述第一电压接头。
- 如权利要求4所述的电压转换装置,其中,所述双极型晶体管的集电极经由第二电阻R4接地。
- 如权利要求5所述的电压转换装置,其中,在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述第二电阻R4两端的电压差使所述第二开关元件Q2导通。
- 如权利要求6所述的电压转换装置,其中,所述判断单元还具有电容器C1,在交流电压经由所述第二电压接头馈入所述电压转换装置的情况下,所述电容器C1使所述第二电阻R4两端保持所述电压差。
- 如权利要求6所述的电压转换装置,其中,所述第二开关元件Q2是金属氧化物半导体场效应(MOS-FET)晶体管,所述金属氧化物半导体场效应(MOS-FET)晶体管的栅极与所述第二电阻R4的非接地一端电连接。
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EP3540931A1 (en) | 2019-09-18 |
US20190356237A1 (en) | 2019-11-21 |
EP3540931B1 (en) | 2020-11-11 |
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