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CN100516895C - Discharge Lamp Driving Device and Its Application Voltage Detection Circuit - Google Patents

Discharge Lamp Driving Device and Its Application Voltage Detection Circuit Download PDF

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Publication number
CN100516895C
CN100516895C CNB2006100328115A CN200610032811A CN100516895C CN 100516895 C CN100516895 C CN 100516895C CN B2006100328115 A CNB2006100328115 A CN B2006100328115A CN 200610032811 A CN200610032811 A CN 200610032811A CN 100516895 C CN100516895 C CN 100516895C
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signal
voltage
circuit
detection circuit
overvoltage
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CN1996026A (en
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葛炽昌
王克文
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Hongfujin Precision Industry Shenzhen Co Ltd
Hon Hai Precision Industry Co Ltd
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Abstract

一种电压侦测电路，用于侦测输入交流信号是否过压或欠压，其包括电压取得电路、过压侦测电路及欠压侦测电路。电压取得电路用于将输入交流信号转换为电压信号。过压侦测电路用于根据电压信号侦测输入交流信号是否过压，及若过压产生过压信号，其包括NPN型晶体管。NPN型晶体管包括基极、集电极及发射极。欠压侦测电路用于根据电压信号侦测输入交流信号是否欠压，及若欠压产生欠压信号，其包括PNP型晶体管。PNP型晶体管包括基极、发射极及集电极。两个基极连接至电压取得电路。上述电压侦测电路可侦测过压及欠压状态，且利用两晶体管进行侦测，输出阻抗较低，不易受干扰。

Figure 200610032811

A voltage detection circuit is used to detect whether an input AC signal is overvoltage or undervoltage, which includes a voltage acquisition circuit, an overvoltage detection circuit and an undervoltage detection circuit. The voltage acquisition circuit is used to convert the input AC signal into a voltage signal. The overvoltage detection circuit is used to detect whether the input AC signal is overvoltage according to the voltage signal, and if the overvoltage generates an overvoltage signal, it includes an NPN transistor. An NPN transistor includes a base, a collector and an emitter. The undervoltage detection circuit is used to detect whether the input AC signal is undervoltage according to the voltage signal, and if undervoltage generates an undervoltage signal, it includes a PNP transistor. A PNP transistor includes a base, an emitter and a collector. The two bases are connected to the voltage acquisition circuit. The above-mentioned voltage detection circuit can detect over-voltage and under-voltage states, and uses two transistors for detection, the output impedance is low, and it is not easy to be disturbed.

Figure 200610032811

Description

The voltage detection circuit of discharge lamp driven apparatus and application thereof
[technical field]
The present invention relates to a kind of lamp-tube driving system, especially about a kind of discharge lamp driven apparatus.
[background technology]
(Liquid Crystal Display, LCD) (Cold Cathode Fluorescent Lamp is CCFL) as the light source of (Backlight) backlight system with discharge lamp (DischargeLamp), particularly cold-cathode fluorescence lamp for panel in liquid crystal display.Typically, cold-cathode fluorescence lamp is driven by converter circuit (Inverter Circuit), and it can supply AC signal to fluorescent tube.When the AC signal overtension of converter circuit output, will cause damage to fluorescent tube, even burn fluorescent tube.When the AC signal brownout of converter circuit output, can't start fluorescent tube.So, need in converter circuit, to increase voltage detection circuit and holding circuit.
Figure 1 shows that the functional block diagram of an existing discharge lamp driven apparatus 10.Discharge lamp driven apparatus 10 comprises that one drives and on-off circuit 100, a transformer circuit 110, a holding circuit 120 and a voltage detection circuit 130.The AC signal that voltage detection circuit 130 exports transformer circuit 110 to light tube group 140 is converted to voltage signal via capacitor C 1, C2 and C3, and via directly exporting an overvoltage signal after the half-wave rectifying circuit D1 half-wave rectification to holding circuit 120.Yet this framework can't carry out under-voltage protection.
Figure 2 shows that the functional block diagram of another existing discharge lamp driven apparatus 10 '.The voltage detection circuit 130 ' of discharge lamp driven apparatus 10 ' is different with the voltage detection circuit 130 of discharge lamp driven apparatus 10.The AC signal that voltage detection circuit 130 ' exports transformer circuit 110 to light tube group 140 is converted to voltage signal via capacitor C 1, C2 and C3; and via after the half-wave rectifying circuit D1 half-wave rectification; separate through two diode D2, D3, to export under-voltage signal Vuvp and overvoltage signal Vovp respectively to holding circuit 120 '.Yet the circuit impedance height of this framework is subject to disturb.
[summary of the invention]
In view of this, need provide a kind of discharge lamp driven apparatus, can detect the whether overvoltage or under-voltage of AC signal of the discharge lamp of flowing through, and output impedance be lower.
So, also need provide a kind of voltage detecting circuit, can detect the whether overvoltage or under-voltage of AC signal of input, and output impedance be lower.
A kind of discharge lamp driven apparatus is used to drive discharge lamp, and it comprises driving and on-off circuit, transformer circuit and voltage detection circuit.Driving and on-off circuit are used for direct current signal is converted to AC signal.Transformer circuit links to each other with driving and on-off circuit, is used for AC signal is converted to another AC signal to drive discharge lamp.Voltage detection circuit is used to detect the whether overvoltage or under-voltage of AC signal of discharge lamp of flowing through, and it comprises that voltage obtains circuit, overvoltage circuit for detecting and under-voltage circuit for detecting.Voltage is obtained circuit and is used for the AC signal of the discharge lamp of flowing through is converted to voltage signal.The overvoltage circuit for detecting is obtained circuit with voltage and is linked to each other, and be used for according to flow through the whether overvoltage of AC signal of discharge lamp of voltage signal detecting, and if overvoltage produces the overvoltage signal, it comprises NPN transistor.NPN transistor comprises base stage, collector and emitter, and base stage is connected to voltage and obtains circuit.Whether under-voltage circuit for detecting is obtained circuit with voltage and is linked to each other, be used for according to the flow through AC signal of discharge lamp of voltage signal detecting under-voltagely, and if the under-voltage signal of under-voltage generation, it comprises PNP transistor.PNP transistor comprises base stage, emitter and collector, and base stage is connected to voltage and obtains circuit.
A kind of voltage detection circuit is used to detect whether overvoltage or under-voltage of input exchange signal, and it comprises that voltage obtains circuit, overvoltage circuit for detecting and under-voltage circuit for detecting.Voltage is obtained circuit and is used for input exchange signal is converted to voltage signal.The overvoltage circuit for detecting is obtained circuit with voltage and is linked to each other, and be used for according to the whether overvoltage of voltage signal detecting input exchange signal, and if overvoltage produces the overvoltage signal, it comprises NPN transistor.NPN transistor comprises base stage, collector and emitter, and the base system utmost point is connected to voltage and obtains circuit.Under-voltage circuit for detecting is obtained circuit with voltage and is linked to each other, and whether be used for detecting input exchange signal according to voltage signal under-voltage, and if the under-voltage signal of under-voltage generation, it comprises PNP transistor.PNP transistor comprises base stage, emitter and collector, and base stage is connected to voltage and obtains circuit.
Above-mentioned voltage detection circuit can be detected overvoltage and under-voltage condition, and utilizes two transistor to detect, and output impedance is lower, is not subject to disturb.
[description of drawings]
Fig. 1 is the functional block diagram of an existing discharge lamp driven apparatus.
Fig. 2 is the functional block diagram of another existing discharge lamp driven apparatus.
Fig. 3 is the functional block diagram of discharge lamp driven apparatus in an embodiment of the present invention.
Fig. 4 is the functional block diagram of discharge lamp driven apparatus in another embodiment of the present invention.
Fig. 5 is the physical circuit figure of voltage detection circuit in an embodiment of the present invention.
[embodiment]
See also Fig. 3, be the functional block diagram of discharge lamp driven apparatus in an embodiment of the present invention 20.Discharge lamp driven apparatus 20 is used to drive light tube group 240.In the present embodiment, discharge lamp driven apparatus 20 comprises: drive and on-off circuit 200, transformer circuit 210, holding circuit 220 and voltage detection circuit 250.Driving and on-off circuit 200 are used for direct current signal is converted to AC signal, and export this AC signal.In the present embodiment, the AC signal of driving and on-off circuit 200 outputs is a square-wave signal.Transformer circuit 210 links to each other with driving and on-off circuit 200, is used for the AC signal that drives and on-off circuit 200 is exported is converted to another AC signal and exports light tube group 240 to.Wherein, this another AC signal is a string ripple signal.Voltage detection circuit 230 is used to detect the whether overvoltage or under-voltage of AC signal of light tube group 240 of flowing through.In the present embodiment, voltage detection circuit 230 links to each other with transformer circuit 210, is used to detect the whether overvoltage or under-voltage of another AC signal of transformer circuit 210 outputs, and output overvoltage signal during overvoltage, exports under-voltage signal when under-voltage.Holding circuit 220 and voltage detection circuit 230 and driving and on-off circuit 200 link to each other, and are used for driving and on-off circuit 200 according to overvoltage signal and under-voltage signal controlling.
Voltage detection circuit 230 comprises that voltage obtains circuit 2300, overvoltage circuit for detecting 2310 and under-voltage circuit for detecting 2320.Voltage is obtained circuit 2500 and is used for the AC signal of the light tube group 240 of flowing through is converted to voltage signal.In the present embodiment, voltage is obtained circuit 2300 and is used for another AC signal of transformer circuit 210 output is converted to voltage signal.Overvoltage circuit for detecting 2310 is obtained circuit 2300 with voltage and is linked to each other, is used for according to flow through the whether overvoltage of AC signal of light tube group 240 of the voltage signal detecting that voltage is obtained circuit 2300 output, and if overvoltage then produces the overvoltage signal.Whether under-voltage circuit for detecting 2320 is obtained circuit 2300 with voltage and is linked to each other, be used for according to the flow through AC signal of light tube group 240 of the voltage signal detecting that voltage is obtained circuit 2300 output under-voltagely, and if under-voltagely then produces under-voltage signal.
Figure 4 shows that the functional block diagram of discharge lamp driven apparatus 20 ' in another embodiment of the present invention.In the present embodiment, the voltage detection circuit 230 of discharge lamp driven apparatus 20 ' is connected to light tube group 240, and all the other are partly identical with the discharge lamp driven apparatus among Fig. 3 20.In the present embodiment, voltage detection circuit 230 is used to detect the whether overvoltage or under-voltage of AC signal of light tube group 240 of flowing through.
Figure 5 shows that the physical circuit figure of voltage detection circuit 230 in an embodiment of the present invention.In the present embodiment, voltage is obtained circuit 2300 and is comprised first capacitor C 5, second capacitor C 6 and half-wave rectifying circuit D4.One termination of first capacitor C 5 is received the AC signal of the light tube group 240 of flowing through, and the other end is connected to an end of second capacitor C 6.In the embodiment of Fig. 3, an end of first capacitor C 5 connects transformer circuit 210.In the embodiment of Fig. 4, an end of first capacitor C 5 connects light tube group 240.The other end ground connection of second capacitor C 6.In the present embodiment, half-wave rectifying circuit D4 comprises two diodes, the anode of one diode is first end of half-wave rectifying circuit D4, and negative electrode links to each other with the anode of another diode and is that second end of half-wave rectifying circuit D4, the negative electrode of another diode are the 3rd end of half-wave rectifying circuit D4.The first end ground connection of half-wave rectifying circuit D4, second end are connected between first capacitor C 5 and second capacitor C 6, and the 3rd end is connected to overvoltage circuit for detecting 2310 and under-voltage circuit for detecting 2320.
Overvoltage circuit for detecting 2310 comprises the first transistor Q1, and the first transistor Q1 comprises first the control utmost point, first electrode and second electrode, and the first control utmost point is connected to the 3rd end that voltage is obtained the half-wave rectifying circuit D4 of circuit 2300.First electrode of the first transistor Q1 connects reference voltage Vref, the second electrode output overvoltage signal.In the present embodiment, the first transistor Q1 is a NPN transistor, and first controls very base stage, and first electrode is a collector, and second electrode is an emitter.In other embodiment of the present invention, the first transistor Q1 also can be the transistor of other type.In other embodiment of the present invention, the first control utmost point is connected to voltage via first resistance R 3 and obtains between circuit 2300, the first control utmost points and second electrode and be connected second resistance R 4.First resistance R 3 and second resistance R 4 are used to carry out dividing potential drop.In the present embodiment, reference voltage Vref is 12V.In other embodiment of the present invention, reference voltage Vref is 15V.
Under-voltage circuit for detecting 2320 comprises transistor seconds Q2, and transistor seconds Q2 comprises second the control utmost point, third electrode and the 4th electrode, and the second control utmost point is connected to the 3rd end that voltage is obtained the half-wave rectifying circuit D4 of circuit 2300.The 4th electrode grounding of transistor seconds Q2, third electrode is exported under-voltage signal.In the present embodiment, transistor seconds Q2 is a PNP transistor, and second controls very base stage, and third electrode is an emitter, and the 4th electrode is a collector.In other embodiment of the present invention, transistor seconds Q2 also can be the transistor of other type.In other embodiment of the present invention, the second control utmost point is connected to voltage via the 3rd resistance R 5 and obtains between circuit 2300, the second control utmost points and the third electrode and be connected the 4th resistance R 6.The 3rd resistance R 5 and the 4th resistance R 6 are used to carry out dividing potential drop.
The AC signal of the light tube group of flowing through 240 is converted to voltage signal via first capacitor C 5 and second capacitor C 6, carries out half-wave rectification via half-wave rectifying circuit D4 again, is transformed to direct current signal.When the AC signal of the light tube group 240 of flowing through just often, the first transistor Q1 and transistor seconds Q2 all end, no overvoltage or under-voltage signal produce.
When the AC signal overvoltage of the light tube group 240 of flowing through, the first transistor Q1 conducting, transistor seconds Q2 ends, and the second electrode output overvoltage signal of the first transistor Q1 is to holding circuit 220.In the present embodiment, the overvoltage signal is a direct current signal.
When the AC signal of the light tube group 240 of flowing through was under-voltage, the first transistor Q1 ended, transistor seconds Q2 conducting, and the third electrode of transistor seconds Q2 is exported under-voltage signal to holding circuit 220.In the present embodiment, under-voltage signal is a direct current signal.
Voltage detection circuit 230 utilizes the first transistor Q1 and transistor seconds Q2 to produce overvoltage or under-voltage signal, and output impedance is lower, be not subject to disturb, and circuit is simple, and cost is lower.

Claims (12)

1.一种电压侦测电路，用于侦测输入交流信号是否过压或欠压，其特征在于所述电压侦测电路包括：1. A voltage detection circuit for detecting whether an input AC signal is overvoltage or undervoltage, characterized in that the voltage detection circuit includes: 电压取得电路，用于将所述输入交流信号转换为电压信号；a voltage acquisition circuit, configured to convert the input AC signal into a voltage signal; 过压侦测电路，与所述电压取得电路相连，用于根据所述电压信号侦测所述输入交流信号是否过压，及若过压产生过压信号，所述过压侦测电路包括NPN型晶体管，所述NPN型晶体管包括基极、集电极及发射极，所述基极连接至所述电压取得电路；及An overvoltage detection circuit, connected to the voltage acquisition circuit, is used to detect whether the input AC signal is overvoltage according to the voltage signal, and if the overvoltage generates an overvoltage signal, the overvoltage detection circuit includes NPN type transistor, the NPN type transistor includes a base, a collector and an emitter, and the base is connected to the voltage obtaining circuit; and 欠压侦测电路，与所述电压取得电路相连，用于根据所述电压信号侦测所述输入交流信号是否欠压，及若欠压产生欠压信号，所述欠压侦测电路包括PNP型晶体管，所述PNP型晶体管包括基极、发射极及集电极，所述基极连接至所述电压取得电路。An undervoltage detection circuit, connected to the voltage acquisition circuit, is used to detect whether the input AC signal is undervoltage according to the voltage signal, and if undervoltage generates an undervoltage signal, the undervoltage detection circuit includes a PNP type transistor, the PNP type transistor includes a base, an emitter and a collector, and the base is connected to the voltage obtaining circuit. 2.如权利要求1所述的电压侦测电路，其特征在于所述NPN型晶体管的集电极连接参考电压，发射极输出所述过压信号。2. The voltage detection circuit according to claim 1, wherein the collector of the NPN transistor is connected to a reference voltage, and the emitter outputs the overvoltage signal. 3.如权利要求2所述的电压侦测电路，其特征在于所述NPN型晶体管的基极经由第一电阻连接至所述电压取得电路，所述NPN型晶体管的基极与发射极之间连接第二电阻。3. The voltage detection circuit according to claim 2, wherein the base of the NPN transistor is connected to the voltage obtaining circuit via a first resistor, and the base and the emitter of the NPN transistor are connected to each other. Connect the second resistor. 4.如权利要求1所述的电压侦测电路，其特征在于所述PNP型晶体管的发射极输出所述欠压信号，所述集电极接地。4. The voltage detection circuit according to claim 1, wherein the emitter of the PNP transistor outputs the undervoltage signal, and the collector is grounded. 5.如权利要求4所述的电压侦测电路，其特征在于所述PNP型晶体管的基极经由第三电阻连接至所述电压取得电路，所述PNP型晶体管的基极与发射极之间连接第四电阻。5. The voltage detection circuit according to claim 4, wherein the base of the PNP transistor is connected to the voltage obtaining circuit via a third resistor, and the base and the emitter of the PNP transistor are connected to each other. Connect the fourth resistor. 6.如权利要求1所述的电压侦测电路，其特征在于所述电压取得电路包括：6. The voltage detection circuit according to claim 1, wherein the voltage obtaining circuit comprises: 第一电容，其一端接收所述输入交流信号；a first capacitor, one end of which receives the input AC signal; 第二电容，其一端连接至所述第一电容的另一端，另一端接地；及a second capacitor with one end connected to the other end of the first capacitor and the other end connected to ground; and 半波整流电路，其第一端接地，第二端连接至所述第一电容的另一端，第三端连接至所述过压侦测电路及所述欠压侦测电路。A half-wave rectifier circuit, the first end of which is grounded, the second end is connected to the other end of the first capacitor, and the third end is connected to the overvoltage detection circuit and the undervoltage detection circuit. 7.一种放电灯驱动装置，用于驱动放电灯，其特征在于所述放电灯驱动装置包括：7. A discharge lamp driving device for driving a discharge lamp, characterized in that the discharge lamp driving device comprises: 驱动及开关电路，用于将输入的直流信号转换为交流信号；A driving and switching circuit for converting an input DC signal into an AC signal; 变压器电路，与所述驱动及开关电路相连，用于将所述交流信号转换为另一交流信号并输出至所述放电灯；及a transformer circuit, connected to the driving and switching circuit, for converting the AC signal into another AC signal and outputting it to the discharge lamp; and 如权利要求1至6任一项所述的电压侦测电路，用于侦测流经所述放电灯的交流信号是否过压或欠压。The voltage detection circuit as claimed in any one of claims 1 to 6 is used for detecting whether the AC signal flowing through the discharge lamp is over-voltage or under-voltage. 8.如权利要求7所述的放电灯驱动装置，其特征在于更包括保护电路，与所述电压侦测电路及所述驱动及开关电路相连，用于根据所述过压信号及所述欠压信号控制所述驱动及开关电路。8. The discharge lamp driving device according to claim 7, further comprising a protection circuit, connected to the voltage detection circuit and the driving and switching circuit, for The pressure signal controls the driving and switching circuit. 9.如权利要求7所述的放电灯驱动装置，其特征在于所述驱动及开关电路输出的交流信号为方波信号。9. The discharge lamp driving device according to claim 7, wherein the AC signal output by the driving and switching circuit is a square wave signal. 10.如权利要求7所述的放电灯驱动装置，其特征在于所述变压器电路输出的另一交流信号为弦波信号。10. The discharge lamp driving device according to claim 7, wherein the other AC signal output by the transformer circuit is a sine wave signal. 11.如权利要求7所述的放电灯驱动装置，其特征在于所述电压侦测电路与所述变压器电路相连，用于侦测所述变压器电路输出的另一交流信号是否过压或欠压。11. The discharge lamp driving device according to claim 7, wherein the voltage detection circuit is connected to the transformer circuit for detecting whether another AC signal output by the transformer circuit is overvoltage or undervoltage . 12.如权利要求7所述的放电灯驱动装置，其特征在于所述电压侦测电路与所述放电灯相连。12. The discharge lamp driving device according to claim 7, wherein the voltage detection circuit is connected to the discharge lamp.
CNB2006100328115A 2006-01-06 2006-01-06 Discharge Lamp Driving Device and Its Application Voltage Detection Circuit Expired - Fee Related CN100516895C (en)

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Cited By (1)

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CN102694473A (en) * 2011-03-21 2012-09-26 国琏电子（上海）有限公司 Power supply system

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CN102279303A (en) * 2010-06-09 2011-12-14 上海宏力半导体制造有限公司 Voltage detection circuit
CN108196109A (en) * 2018-03-16 2018-06-22 南方电网科学研究院有限责任公司 Circuit for monitoring power supply voltage

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CN1480734A (en) * 2002-09-03 2004-03-10 �����ɷ� Circuit for testing low voltage of input voltage of modem
CN1585586A (en) * 2003-08-21 2005-02-23 株式会社电装 Lighting device of discharge lamp

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CN88202349U (en) * 1988-03-25 1988-12-14 中国人民解放军重庆通信学院 Multi-purpose integrated regulator of generator of car
CN2052519U (en) * 1989-03-31 1990-02-07 涿州市运输器材厂 Refrigerator protector
JPH07120507A (en) 1993-10-20 1995-05-12 Toshiba Corp Overvoltage detection circuit
CN1219093A (en) * 1997-11-28 1999-06-09 三菱电机株式会社 Ignitor for high voltage discharging lamp
CN2344942Y (en) * 1998-04-10 1999-10-20 刘立吾 Secondary voltage light modulator
CN1383702A (en) * 2000-06-14 2002-12-04 松下电工株式会社 Discharge lamp driving equipment
CN1480734A (en) * 2002-09-03 2004-03-10 �����ɷ� Circuit for testing low voltage of input voltage of modem
CN1585586A (en) * 2003-08-21 2005-02-23 株式会社电装 Lighting device of discharge lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102694473A (en) * 2011-03-21 2012-09-26 国琏电子（上海）有限公司 Power supply system

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