CN103338548A - Power supply circuit for high-voltage LED driving chip - Google Patents
Power supply circuit for high-voltage LED driving chip Download PDFInfo
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- CN103338548A CN103338548A CN2013101553479A CN201310155347A CN103338548A CN 103338548 A CN103338548 A CN 103338548A CN 2013101553479 A CN2013101553479 A CN 2013101553479A CN 201310155347 A CN201310155347 A CN 201310155347A CN 103338548 A CN103338548 A CN 103338548A
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Abstract
The invention relates to a power supply circuit for a high-voltage LED driving chip. A power supply composed of a resistor and a zener diode is connected with an input end of a voltage regulator and connected with a chip pin Vout after being connected with a diode in series, and the chip pin Vout is connected with a pin VCC. An output end of the voltage regulator is connected with a chip pin VDD_BGR. Another input end of a low voltage drop linear voltage regulator is connected with an output end Vref of a band-gap reference circuit, and an output end of the low voltage drop linear voltage regulator is connected with the chip pin Vout. The power supply composed of the resistor and the zener diode and a power input end of the low voltage drop linear voltage regulator are provided with a switching tube therebetween, wherein a control electrode of the switching tube is connected with an output end of a comparator, an input end of the comparator is connected with the power supply composed of the resistor Res and the zener diode, and another input end is connected with the chip pin VCC. The power supply circuit provided by the invention has multiple power access methods, and users can apply selectively by themselves according to a specific solution, thereby increasing functions and the application flexibility of the chip.
Description
Technical field
The present invention relates to the integrated circuit (IC) design that high-voltage LED drives chip, particularly a kind of improvement that drives the power circuit of chip for high-voltage LED.
Background technology
The LED light working voltage usually reaches tens volts or a few hectovolt.Drive chip for the LED that is used in the hyperbaric environment, nearly all adopt single power supply at present.
High voltage source in the chip employing system that has is directly powered, and shown in Fig. 1-(a), Fig. 1-(b), high voltage source not only provides voltage to LED, returns entire chip voltage is provided.The circuit output voltage V2 that high voltage is formed via resistance and Zener diode knows that by the reverse breakdown characteristics of Zener diode its output voltage V 2 is its reverse breakdown voltage, and this voltage is approximately a constant.V2 gives the LDO(low-voltage-drop linear voltage regulator) and the voltage adjuster power supply.The builtin voltage adjuster is exported a coarse voltage VDD_BGR and is powered to band-gap reference circuit.LDO finally powers to chip internal according to accurate, stable voltage of bandgap voltage reference Vref output.Described resistance can be integrated in chip internal, shown in Fig. 1-(a), sometimes since supply voltage up to several hectovolts, and the technology that chip adopts can only be born tens volts voltage, this moment, resistance can not be integrated, adopts the outer discrete component of sheet, shown in Fig. 1-(b).Thereby adopt discrete resistors to regulate resistance according to the variation of power supply and regulate the electric current that flows through Zener diode, reduce unnecessary electric current waste, have stronger flexibility.The chip that has does not then adopt high voltage source directly to power, but require the user directly provide another independently the stabilizing low voltage power supply to chip power supply.High voltage source only offers the LED lamp.
For adopting high voltage source directly to give the situation of chip power supply, because Zener diode is operated in the reverse breakdown situation.The electric current that flows through Zener diode is determined that by resistance both end voltage and resistance R es its size of current is by illustrating as can be known: (VIN-V2)/and Res.Its peak current is usually up to more than the 10mA during chip operation, and V2 can also keep stable under this peak current in order to make, and the electric current that then requires to flow through resistance R es must namely also have reverse current greater than 10mA in the Zener diode under this peak current.When the chip current sinking does not reach peak value or when very little, electric current unnecessary in the resistance will flow through Zener diode so, so just cause system to waste many power consumptions, reduce chip efficient.
For not adopting high voltage source power supply, and adopt the situation of other power supply power supply, it requires the client that other power supply is provided.And the applicable cases that has is inconvenient to provide this power supply maybe can increase extra device and increase cost.So application of this meeting limited chip.
Summary of the invention
Technical problem to be solved by this invention is to overcome existing defective in the above-mentioned prior art, comprehensive above-mentioned two kinds of supply power modes, a kind of power circuit for high-voltage LED driving chip is provided, establishes two pin VIN and VCC at chip, select one of them supply power mode flexibly.
The present invention has adopted following technical proposal to solve its technical problem: a kind of power circuit that drives chip for high-voltage LED, comprise resistance R es, Zener diode, voltage adjuster, low-voltage-drop linear voltage regulator, band-gap reference circuit, resistance R es is connected the input of voltage adjuster and the power input VDD of low-voltage-drop linear voltage regulator with the power supply that Zener diode is formed, and by connecting chip pin Vout behind diode of serial connection, this chip pin Vout also connects chip pin VCC, the output of voltage adjuster connects high-voltage LED and drives pin of chip VDD_BGR, the output Vref of another input connecting band gap reference circuit of low-voltage-drop linear voltage regulator, the output of low-voltage-drop linear voltage regulator connects pin of chip Vout.The power supply that resistance R es and Zener diode are formed is equipped with a switching tube between an input of connection low-voltage-drop linear voltage regulator, the control utmost point of this switching tube is connected with a comparator output terminal, an input of this comparator connects the power supply of being made up of resistance R es and Zener diode, and another input connects high-voltage LED and drives pin of chip VCC.
User of the present invention can select to give chip power supply with high voltage source, high voltage source is connected to pin VIN(resistance R es after through an outer meeting resistance Res and also can be integrated in the chip, high voltage source is connected to pin VIN earlier, then pass through resistance R es), pin VCC can provide a lower burning voltage as the output of chip outside sheet simultaneously, is outer other system module of chip and chip internal circuit supply.The user also can select for use other independent low pressure stabilized power supply to chip power supply, and receive pin VCC to independent current source voltage this moment, VCC as the input of chip to the chip internal circuit supply.In this case, pin VIN can not take over the unsettled processing of what signal, also can receive on the pin VCC.It cuts little ice when the VIN pin is unsettled, receives pin VCC and can be used as supply access partial circuit in the chip power supply is provided.This shows that the user can not driven the restriction of chip single power supply, two chip pins of selected VIN, VCC insert power supply flexibly.
The present invention can realize that high-voltage LED drives the flexible power supply of chip.For the user provides bigger application space.
Description of drawings
Fig. 1 (a) is that conventional high-tension LED drives chip power supply circuit figure (integrated resistor).
Fig. 1 (b) is that conventional high-tension LED drives chip power supply circuit figure (off chip resistor).
Fig. 2 is that the present invention is used for the power circuit diagram that high-voltage LED drives chip.
Fig. 3 is directly system's equivalent circuit diagram of power supply of high voltage source VDCH.
Fig. 4 is that independent low-tension supply VDCL is by system's equivalent circuit diagram of VCC power supply.
Fig. 5 is that independent low-tension supply VDCL is by system's equivalent circuit diagram of VIN and VCC power supply.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
As shown in Figure 2, it is composed as follows that high-voltage LED of the present invention drives the chip double power supply circuit: resistance R es1 and Zener diode 2, voltage adjuster 3, band-gap reference 6, switching tube 10, comparator 11, low-voltage-drop linear voltage regulator 5(are hereinafter to be referred as LDO) and diode 4.
Resistance R es1 is connected the input of voltage adjuster 3 with the power supply that Zener diode 2 is formed and is connected to the power input VDD of low-voltage-drop linear voltage regulator 5 by switching tube 10, the output of voltage adjuster 3 connects chip pin VDD_BGR, another input of low-voltage-drop linear voltage regulator 5 connects the output Vref of band-gap reference 6, the output of low-voltage-drop linear voltage regulator 5 connects chip pin Vout, and resistance R es1 exports with the power access circuit that Zener diode 2 is formed and be connected chip pin Vout after being connected in series a diode 4; Chip pin VCC connects chip pin Vout.
The present invention also connects between the low-voltage-drop linear voltage regulator 5 power input VDD at the power supply of resistance R es1 and Zener diode 2 compositions, be equipped with a switching tube 10, the control utmost point of this switching tube 10 is connected with a comparator 11 outputs, an input of this comparator 11 connects the power supply of being made up of resistance R es1 and Zener diode 2, and another input connects high-voltage LED and drives pin of chip VCC.
The present invention can use the way of prior art, and resistance R es1 is integrated in the chip or divides and stands in outside the chip, all is connected with high voltage source input pin VIN.
Below sketch the operation principle of circuit of the present invention:
See Fig. 2, Fig. 3, when adopting high voltage source VDCH8 power supply, VDCH8 is input to high-voltage LED and drives pin of chip VIN behind resistance R es1, learn that by the reverse breakdown characteristics of Zener diode 2 the V2 magnitude of voltage equals its reverse breakdown voltage.VIN is as the power supply input pin, and output need add a bigger electric capacity 7 and stablizes its output voltage VCC as LDO5.Because the voltage of V2 is higher than the voltage of Vout, so the PN junction of diode 4 is anti-inclined to one side, not enough so that its reverse breakdown because of the reversed bias voltage at its two ends again is so diode 4 opens circuit.At this moment, the equivalent electric circuit of system as shown in Figure 3, VIN is output voltage V 2 behind resistance R es1 and Zener diode 2.Because this moment, V2 was higher than VCC (VOUT), comparator 11 is output as height, and switching tube 10 is opened, and V2 directly provides power supply to LDO5, so the LDO5 operate as normal.V2 gives band-gap reference 6 power supplies through voltage adjuster 3 output voltage V 1.One of the reference voltage Vref output that last LDO5 provides according to band-gap reference 6 precisely and burning voltage Vout as the chip internal voltage source, the while also can power to chip exterior through the VCC pin.
See Fig. 2, Fig. 4, when chip adopted other low voltages VDCL9 power supply without the high voltage source power supply, power supply was directly received VCC.Because this moment, VCC was higher than about 0.7 volt of V2, comparator 11 is output as low, and switching tube 10 is closed, so LDO5 does not work, it is inoperative in Circuits System, it can be ignored.But the output of LDO5 directly meets fixed power source VDCL.When if VIN is unsettled, the equivalent electric circuit of its system as shown in Figure 4, VCC voltage gives voltage adjuster 3 power supplies after reducing about 0.7V through diode 4, and voltage adjuster 3 output voltage V 1 again gives band-gap reference circuit 6 power supplies, and other module of chip internal is directly powered by VDCL.
See Fig. 2, Fig. 5, if VIN receives VCC, then diode 4 both end voltage equate, diode 4 can be regarded as and open circuit, because the VCC of comparator 11 inputs is identical with V2 at this moment, it is output as low, switching tube 10 is closed, so LDO5 does not work, it is inoperative in Circuits System, but the output of LDO5 directly meets fixed power source VDCL.The equivalent electric circuit of its system as shown in Figure 5, VDCL directly gives voltage adjuster 3 and other module for power supply of chip internal (except band-gap reference).
In sum, this high-voltage LED drives the chip double power supply circuit can three kinds of approach that insert power supply: high voltage source VDCH directly powers; Independent low-tension supply VDCL powers by VCC; Independent low-tension supply VDCL is by VIN and VCC power supply.The user can use oneself selection according to three kinds of schemes are concrete, thereby has increased the flexibility of the function and application of chip.
Claims (4)
1. one kind is used for the power circuit that high-voltage LED drives chip, comprise resistance R es, Zener diode, voltage adjuster, low-voltage-drop linear voltage regulator, band-gap reference circuit, resistance R es is connected the input of voltage adjuster and input of power supply of low-voltage-drop linear voltage regulator with the power supply that Zener diode is formed, and by connecting chip pin Vout behind diode of serial connection, this chip pin Vout also connects chip pin VCC, the output of voltage adjuster connects high-voltage LED and drives pin of chip VDD_BGR, the output Vref of another input connecting band gap reference circuit of low-voltage-drop linear voltage regulator, the output of low-voltage-drop linear voltage regulator connects pin of chip Vout, it is characterized in that: the power supply that resistance R es and Zener diode are formed is equipped with a switching tube between an input of connection low-voltage-drop linear voltage regulator, the control utmost point of this switching tube is connected with a comparator output terminal, an input of this comparator connects the power supply of being made up of resistance R es and Zener diode, and another input connects high-voltage LED and drives pin of chip VCC.
2. according to claim 1ly drive the power circuit of chip for high-voltage LED, it is characterized in that: the output of low-voltage-drop linear voltage regulator increases and connects an electric capacity.
3. according to claim 1ly drive the power circuit of chip for high-voltage LED, it is characterized in that: resistance R es is integrated in high-voltage LED and drives in the chip, and VIN is connected with the high voltage source input pin.
4. according to claim 1ly drive the power circuit of chip for high-voltage LED, it is characterized in that: resistance R es and divide and stand in high-voltage LED and drive outside the chip, VIN is connected with the high voltage source input pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101553479A CN103338548A (en) | 2013-05-01 | 2013-05-01 | Power supply circuit for high-voltage LED driving chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013101553479A CN103338548A (en) | 2013-05-01 | 2013-05-01 | Power supply circuit for high-voltage LED driving chip |
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| CN103338548A true CN103338548A (en) | 2013-10-02 |
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| CN2013101553479A Pending CN103338548A (en) | 2013-05-01 | 2013-05-01 | Power supply circuit for high-voltage LED driving chip |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1591115A (en) * | 2003-08-29 | 2005-03-09 | 罗姆股份有限公司 | Power supply apparatus |
| JP2007242886A (en) * | 2006-03-08 | 2007-09-20 | Sony Corp | Light emitting element driving circuit, and portable device equipped therewith |
| CN101959339A (en) * | 2009-07-17 | 2011-01-26 | 上海沙丘微电子有限公司 | High-voltage LED driving chip dual-power supply circuit |
| CN102841241A (en) * | 2011-06-23 | 2012-12-26 | 神讯电脑(昆山)有限公司 | Voltage detection circuit |
| CN203206564U (en) * | 2013-05-01 | 2013-09-18 | 上海芯地信息科技有限公司 | Power supply circuit of high-voltage LED driving chip |
-
2013
- 2013-05-01 CN CN2013101553479A patent/CN103338548A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1591115A (en) * | 2003-08-29 | 2005-03-09 | 罗姆股份有限公司 | Power supply apparatus |
| JP2007242886A (en) * | 2006-03-08 | 2007-09-20 | Sony Corp | Light emitting element driving circuit, and portable device equipped therewith |
| CN101959339A (en) * | 2009-07-17 | 2011-01-26 | 上海沙丘微电子有限公司 | High-voltage LED driving chip dual-power supply circuit |
| CN102841241A (en) * | 2011-06-23 | 2012-12-26 | 神讯电脑(昆山)有限公司 | Voltage detection circuit |
| CN203206564U (en) * | 2013-05-01 | 2013-09-18 | 上海芯地信息科技有限公司 | Power supply circuit of high-voltage LED driving chip |
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Application publication date: 20131002 |