CN102711328A - Linear constant-current controller - Google Patents
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- CN102711328A CN102711328A CN2012101713806A CN201210171380A CN102711328A CN 102711328 A CN102711328 A CN 102711328A CN 2012101713806 A CN2012101713806 A CN 2012101713806A CN 201210171380 A CN201210171380 A CN 201210171380A CN 102711328 A CN102711328 A CN 102711328A
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Abstract
The invention discloses a linear constant-current controller, which comprises a chip of the controller, a driving device and a lighting lamp. The controller is connected with a source electrode of a high-voltage power tube, the drain electrode of the high-voltage power tube is connected with an input voltage source through a constant-current load, the input voltage source supplies a unidirectional pulse power grid voltage to rectify an alternative current power grid voltage, a first resistor and a second resistor are serially connected between the input voltage source and the power supply end of the controller, the grid electrode of the high-voltage power tube is connected with a node between the first resistor and the second resistor, and the controller comprises a power grid current control circuit and an error amplification circuit, wherein the power grid current control circuit controls to acquire a power grid current in a current acquiring window of the unidirectional pulse power grid voltage based on a partial voltage signal from the input voltage source and an amplified error signal; the error amplification circuit determines an average current of the power grid current based on a detection signal of the power gird current flowing out from the power grid current control circuit, and generates the amplified error signal. According to the linear constant-current controller, the manufacturing costs of the linear constant-current controller and the corresponding driving device are obviously reduced, and the application flexibility of the linear constant-current controller and the corresponding driving device are obviously improved.
Description
Technical field
The present invention relates to linear constant-current controller circuit,, comprise the chip and the drive unit of this controller in particular to a kind of high-efficient linear constant-current controller that is used to drive current source loads, and the lighting that comprises said drive unit.
Background technology
Because have the light efficiency height, the life-span is long, radiationless and characteristics such as low-power consumption, the application of light-emitting diode (LED) in lighting industry is increasingly extensive.As a kind of current source loads, LED need with constant pressure source load Different control device.At present, industrial quarters mainly contains the controller of two big types of driving LED.One type is the switch constant-current controller, and main feature need to be inductance and transformer, and efficient generally all realizes higherly under various conditions, but cost is also high simultaneously.Another kind of is linear constant-current controller, and it does not need inductance and transformer, though efficient is difficult to realize highly under certain conditions, cost is relatively low.
In applicant's one Chinese patent application CN102333405A (on January 25th, 2012 is open), disclosed a kind of novel linear constant-current controller, its efficient can realize quite with the efficient of switch constant-current controller.With reference to Fig. 1, Fig. 1 shows the circuit structure of this controller.Wherein, 110V or 220V ac grid voltage are after rectifier bridge 180 rectifications, and input voltage source VIN provides the line voltage of unidirectional pulsation, and electric current then is divided into three the tunnel, and the first via provides feed-forward signal after resistance 205 and resistance 206 dividing potential drops, for controller 200; The second the tunnel gives electric capacity 204 chargings through resistance 103, and electric capacity 204 provides the power supply power supply for controller 200; Behind LED load 190 of Third Road process and the electric capacity 185, the drain electrode that gets into controller 200 internal power FETs 201, the source electrode from power field effect pipe 201 flows out through detection resistance 202 to reference ground again.
Power network current control circuit 220 is based on VSD node voltage signal and the error signal EAO through amplifying, and is controlled in the power taking stream window of unidirectional pulsation line voltage and obtains power network current.Wherein, the VSD node voltage comes the dividing potential drop of self- resistance 205 and 206 couples of input voltage source VIN of resistance, and it plays feedforward action, makes control loop can respond soon for the fluctuation of line voltage.Power network current control circuit 220 has determined three parameters of power network current, the one, current peak; The 2nd, the line voltage lower window edge value VLED of power taking stream; The 3rd, the slope of the power network current decline/rising at line voltage window upper limit place.
Based on the detection signal CS of the power network current that flows out through power network current control circuit 220, the average current of error amplifying circuit 230 decision power network currents, the average current of LED load just 190, the error signal EAO of output simultaneously through amplifying.Signal EAO delivers to power network current control circuit 220, to determine voltage window higher limit VLED+ Δ V with VSD voltage.
As shown in Figure 1, power network current control circuit 220 comprises subtracter 211, adder 212, fast amplifier 213 and power field effect pipe 201.Wherein, An input of subtracter 211 receives the voltage division signal from VIN, and another input receives through the error signal EAO that amplifies, and produces output signal SUBO; This output voltage of signals is the product of the voltage difference and the COEFFICIENT K of two input signals, and wherein K is more than or equal to 1; An input of adder 212 receives signal SUBO, and another input receives the detection signal CS of power network current, produces output signal ADDO; An input of fast amplifier 213 receives signal ADDO, and another input receives reference voltage REFP, and its output connects the grid of power field effect pipe 201; The drain electrode of power field effect pipe 201 is connected to VIN through LED load 190, and its source electrode is connected to reference to ground through detecting resistance 202.
Error amplifying circuit 230 comprises error amplifier (EA) 214 and the loop compensation network of being made up of electric capacity 215, resistance 216.The first input end of error amplifier 214 is through the detection signal CS of loop compensation resistance 216 reception power network currents, and second input receives reference voltage REFA, and its output produces signal EAO, is connected to the subtracter 211 in the power network current control circuit 220.Error amplifier 214 and reference voltage REFA have determined the average current value of LED load 190.Loop compensation electric capacity 215; Be connected between the node and error amplifier output between error amplifier first input end and the loop compensation resistance 216; The effect of this building-out capacitor and above-mentioned compensating resistance 216 is the stability that keeps loop; Make the frequency loop bandwidth much smaller than the frequency 100Hz of VIN, to realize average constant current simultaneously.
Though above-mentioned prior art help to reduce linear constant-current controller cost, raise the efficiency and reliability, weak point is that its manufacturing cost is still higher.Among Fig. 1, high-voltage power FET 201 is positioned at the inside of controller 200, because the superhigh pressure integrated circuit fabrication process is complicated, causes manufacturing cost higher.And microelectronic in modern times, manufacturing cost has almost determined the success or failure of IC products, is the constant theme of microelectronic industry so pursue low manufacturing cost.
Summary of the invention
To above-mentioned defective, the objective of the invention is to, reduce the manufacturing cost of existing linear constant-current controller and respective drive device, and improve their application flexibility and thermal safety.
Above-mentioned purpose of the present invention realizes through device and lighting that linear constant-current controller, chip, driving current source loads are provided.
According to a first aspect of the invention; A kind of linear constant-current controller is provided; Said controller links to each other with the source electrode of a high-voltage power pipe; The drain electrode of said high-voltage power pipe is connected to input voltage source through current source loads, and said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, and first resistance, second resistance are connected in series between the power end of said input voltage source and controller; The grid of said high-voltage power pipe connects the node between first resistance, second resistance; Said controller comprises: the power network current control circuit based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, is controlled in the power taking stream window of said unidirectional pulsation line voltage and obtains power network current; And error amplifying circuit, based on the detection signal of the power network current that flows out through said power network current control circuit, confirm the average current of said power network current, and produce said error signal through amplifying.
In first aspect; Preferably, said power network current control circuit comprises: subtracter, and one input end receives the voltage division signal from said input voltage source; Another input receives said error signal through amplifying; Produce the first output signal, the said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1; Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal; Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And the low pressure metal-oxide-semiconductor, its grid connects the output of said fast amplifier, and its drain electrode connects the source electrode of said high-voltage power pipe, and its source electrode detects resistance through one and is connected to reference to ground.
Preferably; Said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity; Wherein, Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying; Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
Preferably; Said controller also comprises thermal-shutdown circuit; It is according to the detection signal of the said power network current of Temperature Treatment of said controller, and the detection signal after will handling offers adder and the error amplifier in the error amplifying circuit in the said power network current control circuit.
Preferably; Said thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, diode and the 3rd resistance; Wherein, an input of said operational transconductance amplifier receives the output signal of said temperature sensor, and its another input receives the 3rd reference signal; Its output connects an end of the 3rd resistance through said diode, and the other end of the 3rd resistance connects the source electrode of said low pressure metal-oxide-semiconductor and detects the node between the resistance.
According to second aspect, a kind of chip is provided, it is characterized in that, comprise the controller described in the above-mentioned first aspect.
According to the third aspect; A kind of device that drives current source loads is provided, comprises linear constant-current controller, high-voltage power pipe, first resistance and second resistance, wherein; Said controller links to each other with the source electrode of high-voltage power pipe; The drain electrode of said high-voltage power pipe is connected to input voltage source through current source loads, and said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, and said first resistance, second resistance are connected in series between the power end of said input voltage source and controller; The grid of said high-voltage power pipe connects the node between first resistance, second resistance; Said controller comprises: the power network current control circuit based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, is controlled in the power taking stream window of said unidirectional pulsation line voltage and obtains power network current; And error amplifying circuit, based on the detection signal of the power network current that flows out through said power network current control circuit, confirm the average current of said power network current, and produce said error signal through amplifying.
In the third aspect; Preferably, said power network current control circuit comprises: subtracter, and one input end receives the voltage division signal from said input voltage source; Another input receives said error signal through amplifying; Produce the first output signal, the said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1; Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal; Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And the low pressure metal-oxide-semiconductor, its grid connects the output of said fast amplifier, and its drain electrode connects the source electrode of said high-voltage power pipe, and its source electrode detects resistance through one and is connected to reference to ground.
Preferably; Said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity; Wherein, Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying; Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
Preferably; Said controller also comprises thermal-shutdown circuit; It is according to the detection signal of the said power network current of Temperature Treatment of said controller, and the detection signal after will handling offers adder and the error amplifier in the error amplifying circuit in the said power network current control circuit.
Preferably; Said thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, first diode and the 3rd resistance; Wherein, an input of said operational transconductance amplifier receives the output signal of said temperature sensor, and its another input receives the 3rd reference signal; Its output connects an end of the 3rd resistance through said first diode, and the other end of the 3rd resistance connects the source electrode of said low pressure metal-oxide-semiconductor and detects the node between the resistance.
Preferably, under the condition that electric property allows, said high-voltage power pipe and controller are as close as possible on circuit board.
Preferably, said high-voltage power pipe and controller are positioned at an integrated circuit encapsulation.
Preferably, said device also comprises second diode between said current source loads and high-voltage power pipe, and the positive pole of said second diode is connected with current source loads, and its negative pole is connected with the drain electrode of said high-voltage power pipe.
Preferably, said device comprises that also one is positioned at the outside electric capacity of said controller, and an end of said electric capacity is connected to reference to ground, and the other end is connected to the node between the source electrode of drain electrode and high-voltage power pipe of said low pressure metal-oxide-semiconductor.
According to fourth aspect, a kind of lighting is provided, it is characterized in that, comprise device described in the above-mentioned third aspect and LED load.
The present invention overcomes the obstacle of technical realization, and innovation ground is separated high-voltage power pipe and controller circuitry, thereby makes the manufacturing cost of linear constant-current controller and respective drive device descend about 50%.And, according to the present invention,, obviously strengthened the application flexibility of linear constant-current controller and drive unit because of selecting various types of power tubes for use.For example, can select the power tube of various voltage specifications, the power tube of various current specification according to actual needs for use, perhaps the power tube of various packing forms.If ac grid voltage is high, just select withstand voltage high power tube for use; If output current is big, just select the big power tube of output current ability.
Description of drawings
For understanding the present invention better, hereinafter combines accompanying drawing that the present invention is described further with embodiment.In the accompanying drawing:
Fig. 1 is the electrical block diagram of the linear constant-current controller of prior art;
Fig. 2 is the electrical block diagram of the linear constant-current controller of one embodiment of the invention;
Fig. 3 is the electrical block diagram of the linear constant-current controller of another embodiment of the present invention;
Fig. 4 shows a kind of concrete implementation of thermal-shutdown circuit among Fig. 3;
Fig. 5 shows the operation principle of thermal-shutdown circuit.
Embodiment
With reference to Fig. 2, Fig. 2 is the electrical block diagram of the linear constant-current controller of one embodiment of the invention, and identical Reference numeral is indicated identical components and parts all the time.Different with existing linear constant current scheme shown in Figure 1 is; Fig. 1 middle controller 200 inner power field effect pipes 201 are replaced by two elements; Outside high pressure (withstand voltage more than the 400V) power tube 201b and inner low pressure (withstand voltage below 40V) metal-oxide-semiconductor 201a, their cascades together.Correspondingly, between resistance 103 and electric capacity 204, set up a resistance 109 in the circuit of Fig. 2, resistance 103, resistance 109 are connected in series between the power end VCC of input voltage source VIN and controller 200a.The drain electrode of high-voltage power pipe 201b is connected to input voltage source VIN through LED load 190, and its grid connects the node between resistance 103 and the resistance 109.
Low pressure metal-oxide-semiconductor 201a replaces the position of power field effect pipe 201 among Fig. 1, and it belongs to power network current control circuit 220a, is integrated in the inside of controller 200a with other circuit.The grid of low pressure metal-oxide-semiconductor 201a is connected with the output of fast amplifier 213, and source electrode is connected to node CS, and its drain electrode connects the source electrode of high-voltage power pipe 201b.
Through the resistance ratio of change resistance 109 with resistance 103, but the grid voltage of free adjustment high-voltage power pipe 201b, and it is following to embody formula.
V(GATE)＝VIN*R109/(R103+R109)+V(VCC) (1)
The benefit of doing like this is, the one, and can select the power tube of various cut-in voltages, the power tube of high cut-in voltage just to need high any grid voltage; The 2nd, can regulate the power division between power tube 201b and the low pressure metal-oxide-semiconductor 201a; The grid voltage setting of power tube 201b is high more; (it is just big more to equal V (GATE)-VGS201b) for the voltage that metal-oxide-semiconductor 201a bears; Therefore, under the constant prerequisite of output current, the power that controller 200a bears will be big more.Like this, can suitably alleviate the heat radiation difficulty of power tube 201b.Because of the heat radiation of power tube 201b is the design difficulty of whole system, so such power division is adjusted to and finds best heat radiation cost that a kind of means are provided.For example, the supposing the system total power consumption is 1.5W, and power tube 201b and metal-oxide-semiconductor 201a are bearing most system power dissipation.GATE voltage is provided with highly more, and then the voltage born of metal-oxide-semiconductor 201a is just high more, and the power that 201a bears is also just high more, and the power born of power tube 201b is just more little so.
Generally speaking, power tube 201b is bearing most of power consumption of system.Power consumption is big, will produce a lot of heats unavoidably, causes the working temperature of power tube 201b higher.If working temperature surpasses 150 degrees centigrade, will influence the life-span of power tube; As surpassing 200 degrees centigrade, the life-span of power tube possibly have only several hours, even moment burns.Consider this point, preferably, can be at controller set inside one thermal-shutdown circuit, to protect power tube 201b indirectly.With reference to Fig. 3, Fig. 3 is the electrical block diagram of the linear constant-current controller of another embodiment of the present invention.Be provided with thermal-shutdown circuit 310 in the controller 300.The detection signal CS of power network current outputs to the adder 212 among the power network current control circuit 220a with the CSOTP signal again, and outputs to the error amplifier 214 in the error amplifying circuit 230 after excess temperature protective circuit 310 is handled.Therefore, the CSOTP signal had both contained real output current information CS, contained the temperature information of controller 300 again, after the information via certain functions relation of this two aspect is handled, just can reach the purpose of overheat protector.
Fig. 4 shows a kind of concrete implementation of thermal-shutdown circuit among Fig. 3.Among Fig. 4, thermal-shutdown circuit 310 comprises temperature sensor 311, operational transconductance amplifier (OTA) 312, diode 313 and resistance 314.Wherein, the positive input terminal of operational transconductance amplifier 312 receives the signal of temperature sensor 311 outputs, and this signal is PTAT (being directly proportional with the absolute temperature) voltage for being directly proportional with temperature for example; Negative input end receives a reference voltage REFT; Its output is connected to resistance 314 through diode 313, and the other end of resistance 314 is connected to node CS.
The effect of diode 313 is unidirectional conductings, this means, it is to flow out just effectively that operational transconductance amplifier 312 has only output current, that is, have only when PTAT voltage just has electric current during greater than reference voltage REFT and pass through diode 313.PTAT voltage is proportional to the die temperature of controller 300; Therefore; When the temperature of controller 300 less than the temperature threshold of setting (this threshold value is decided by REFT) since diode 313 stop that the output current of operational transconductance amplifier 312 can't arrive on the resistance 314; That is to say that thermal-shutdown circuit 310 is not activated.Have only the temperature of working as controller 300 greater than the temperature threshold of setting, operational transconductance amplifier 312 just can be exported a certain size electric current to resistance 314, this means the startup of thermal-shutdown circuit 310.Pressure drop on the resistance 314 is big more, and CS voltage will be more little, just means that also system's output current can be more little.
Above-mentioned implication can be expressed as follows with mathematical formulae, and wherein, Gm is the transconductance parameters of operational transconductance amplifier 312.
V (CSOTP)=Gm* (V (PTAT)-V (REFT)) * R314+V (CS) is as V (PTAT)＞V (REFT) (2)
=V (CS) is as V (PTAT)＜V (REFT)
The operation principle of thermal-shutdown circuit 310 is as shown in Figure 5.System starts shooting at t1 constantly, and start back system temperature slowly raises, and the also linear ratio of the output PTAT voltage of temperature sensor 311 rises.After PTAT voltage is raised to VREFT (that is, system temperature has reached the overheat protector critical point), be 2 moment of t this moment, and operational transconductance amplifier 312 beginning output currents are to resistance 314.After this, the temperature of controller 300 will be parked in the overheat protector critical point, and can not rise again, shown in solid line among the figure.The dotted line of t after 2 moment representes not establish the temperature rising curve of thermal-shutdown circuit 310, and visible, temperature can constantly rise, till certain element is burnt.T2 constantly before, output current all maintains normal level, t2 constantly after, begin to reduce output current, purpose is in order to reduce power output, thereby reduce system heat power consumption so that temperature stabilization at the critical temperature point.T 3 back output current constantly is stable again, and this is the temperature current balance point of system for realizing that adjustment finds automatically.
The complete overheat protector process prescription of high-voltage power pipe 201b is following.After the start, system's heat power consumption almost all concentrates on two elements of metal-oxide-semiconductor 201a of power tube 201b and controller 300 inside, and the former will be much larger than the latter usually.Generally speaking, power tube 201b puts together with controller 300, and the temperature information that temperature sensor 311 perceives in the controller 300 has comprised the heat power consumption information of two aspects, and the one, the heat power consumption of the metal-oxide-semiconductor 201a of controller 300 inside; The 2nd, the heat power consumption of the power tube 201b of controller 300 outsides.Externally under the constant situation of condition, the total power consumption that both add up is constant basically, and is of preamble, can realize that through regulating resistance 109 power consumption of total power consumption between two elements distribute.The heat power consumption of metal-oxide-semiconductor 201a can 100% be used for making controller 300 temperature to raise, and the heat power consumption of power tube 201b can only some be delivered to controller 300 its temperature is raise, and both lean on closely more, and the heat of biography is many more.
Formula 3 can be summarized above information, wherein, and T
300The thermal equilibrium temperature of expression controller 300, P
201aThe heat power consumption of expression metal-oxide-semiconductor 201a, P
201bThe heat power consumption of expression power tube 201b.C is a heat couple coefficient, expresses the strong and weak degree of thermal coupling between power tube 201b and the controller 300, and C is big more, and thermal coupling is strong more.K
300Be thermal resistivity, express the heat-sinking capability of controller 300, heat-sinking capability is poor more, K
300Big more.K
201bBe the thermal resistivity of power tube 201b, likewise, heat-sinking capability is poor more, K
201bBig more.T
AIt is the ambient temperature of system works.It is thus clear that the thermal equilibrium temperature of controller 300 is relevant with six aspect factors, the one, total heat power consumption (P of system
201a+ P
201b); Two is the power division (relevant with resistance 109 sizes) between two power component 201b and the 201a; Three is two thermal coupling intensity between the element; The 4th, the heat-sinking capability of controller 300 self; The 5th, the heat-sinking capability of power tube 201b self; The 6th, ambient temperature.
T
300＝K
300*P
201a+C*K
201b*P
201b+T
A (3)
Visible by formula 4, the thermal equilibrium temperature of power tube 201b is relevant with three aspect factor, and the one, himself heat-sinking capability, the 2nd, the thermal power that it bears is ambient temperature at last.
T
201b＝K
201b*P
201b+T
A (4)
With formula 4 substitution formula 3, the relation between thermal equilibrium temperature that can controlled device 300 and the thermal equilibrium temperature of power tube 201b is shown in formula 5.
T
300＝K
300*P
201a+C*(T
201b-T
A)+T
A (5)
Thus it is clear that,, can realize fully indirectly power tube 201b being carried out overheat protector through the maximum operating temperature of restriction controller 300.Suppose ambient temperature T
A=60 degree, controller 300 thermal resistance K
300=100, the power P of metal-oxide-semiconductor 201a
201a=0.4 watt, heat couple coefficient C=0.43, and suppose that the overheat protector threshold temperature of controller 300 is made as 130 degree, and so, can calculate according to formula 5, the maximum operating temperature of power tube 201b also is limited in about 130 degree.That is to say that as long as the maximum temperature of controller 300 is limited in below 130 degree, likewise, the maximum temperature of power tube 201b also will be limited in below 130 degree.
In above example, consider that high-voltage power pipe 201b separates with controller 300, therefore, heat couple coefficient C choosing does 0.43, representes stronger thermal coupling, and this just requires power tube 201b and controller 300 spatially at a distance of very near.This point is prone to understand; Controller 300 will provide effective overheat protector to power tube 201b, just needs as far as possible the temperature of perception power tube 201b exactly, certainly will require power tube 201b spatially as far as possible near controller 300; That is to say that the thermal coupling intensity between them will be tried one's best greatly.Among the present invention, preferably, can adopt one of following dual mode make the two spatially near.A kind of mode is, on circuit board, under the condition that electric property allows, makes power tube 201b and controller 300 as close as possible, makes thermal coupling as far as possible strongly.Because the cause of space opening, general this thermal coupling intensity are all understood weak, C is below 0.3 usually; Another kind of mode is, power tube 201b and controller 300 is enclosed in the confined space, such as, power tube 201b tube core and controller 300 tube cores are enclosed in an integrated circuit encapsulates, like this, can heat couple coefficient C be done height, as accomplish C=0.6.
It may be noted that the particular circuit configurations shown in Fig. 4 is an example of thermal-shutdown circuit among Fig. 3, said thermal-shutdown circuit also can adopt other forms of circuit structure, as long as can realize the described overheat protector principle of preamble.This is understandable to those skilled in the art.
With reference to Fig. 4, preferably, can between LED load 190 and high-voltage power pipe 201b, diode 201c be set once more, the negative pole of the positive pole of diode 201c and LED load 190 and electric capacity 185 is connected together, and its negative pole connects the drain electrode of high-voltage power pipe 201b.Because after power tube 201b is external, introduce easily the interference that is difficult to expect, the most dangerous interference is exactly a negative current, possibly cause the controller 300 can't operate as normal.And utilize the unidirectional on state characteristic of diode 201c, just can avoid the interference of negative current effectively to controller 300.Simultaneously, because negative current can cause loss in efficiency, diode 201c can also play the effect of increase system efficiency.Certainly, diode 201c also can be positioned at other positions, and for example, between resistance 103 and electric capacity 185, load 190, the positive pole of 201c is connected to the common tie point of resistance 103, resistance 205 and rectifier bridge 180 positive outputs, and negative pole connects the positive pole of electric capacity 185.This method that connects also can reach same effect.
Preferably, as shown in Figure 4, also can be at the outer setting electric capacity 301 of controller 300, an end of electric capacity 301 is connected to reference to ground, and the other end is connected with node IN.At node IN, the source electrode of power tube 201b is connected with the drain electrode of low pressure metal-oxide-semiconductor 201a.Because node IN is the direct current high impedance, very easily introduces noise, thereby the work of meeting interference suppressor 300 and power tube 201b, even cause system to be burnt.The effect of electric capacity 301 just is, a Low ESR alternating current path is provided, the interference that filtering is possible, thus guarantee system safety operation.
Obviously, the present invention described here can have many variations, and this variation can not be thought and departs from the spirit and scope of the present invention.Therefore, the change that all it will be apparent to those skilled in the art all is included within the covering scope of appended claims.
Claims (16)
1. linear constant-current controller; Said controller links to each other with the source electrode of a high-voltage power pipe; The drain electrode of said high-voltage power pipe is connected to input voltage source through current source loads; Said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification; First resistance, second resistance are connected in series between the power end of said input voltage source and controller, and the grid of said high-voltage power pipe connects the node between first resistance, second resistance, and said controller comprises: the power network current control circuit; Based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, be controlled in the power taking stream window of said unidirectional pulsation line voltage and obtain power network current; And
Error amplifying circuit based on the detection signal of the power network current that flows out through said power network current control circuit, is confirmed the average current of said power network current, and produces said error signal through amplifying.
2. controller as claimed in claim 1 is characterized in that, said power network current control circuit comprises:
Subtracter; One input end receives the voltage division signal from said input voltage source; Another input receives said error signal through amplifying; Produce the first output signal, the said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1;
Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal;
Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And
The low pressure metal-oxide-semiconductor, its grid connects the output of said fast amplifier, and its drain electrode connects the source electrode of said high-voltage power pipe, and its source electrode detects resistance through one and is connected to reference to ground.
3. controller as claimed in claim 2 is characterized in that, said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity, wherein,
Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying;
Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
4. controller as claimed in claim 3; It is characterized in that; Said controller also comprises thermal-shutdown circuit; It is according to the detection signal of the said power network current of Temperature Treatment of said controller, and the detection signal after will handling offers adder and the error amplifier in the error amplifying circuit in the said power network current control circuit.
5. controller as claimed in claim 4; It is characterized in that said thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, diode and the 3rd resistance, wherein; One input of said operational transconductance amplifier receives the output signal of said temperature sensor; Its another input receives the 3rd reference signal, and its output connects an end of the 3rd resistance through said diode, and the other end of the 3rd resistance connects the source electrode of said low pressure metal-oxide-semiconductor and detects the node between the resistance.
6. a chip is characterized in that, comprises each described controller in the claim 1 to 5.
7. device that drives current source loads; Comprise linear constant-current controller, high-voltage power pipe, first resistance and second resistance; Wherein, said controller links to each other with the source electrode of high-voltage power pipe, and the drain electrode of said high-voltage power pipe is connected to input voltage source through current source loads; Said input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification; Said first resistance, second resistance are connected in series between the power end of said input voltage source and controller, and the grid of said high-voltage power pipe connects the node between first resistance, second resistance, and said controller comprises:
The power network current control circuit based on one from the voltage division signal of said input voltage source with once the error signal of amplifying, is controlled in the power taking stream window of said unidirectional pulsation line voltage and obtains power network current; And
Error amplifying circuit based on the detection signal of the power network current that flows out through said power network current control circuit, is confirmed the average current of said power network current, and produces said error signal through amplifying.
8. device as claimed in claim 7 is characterized in that, said power network current control circuit comprises:
Subtracter; One input end receives the voltage division signal from said input voltage source; Another input receives said error signal through amplifying; Produce the first output signal, the said first output voltage of signals is the product of the voltage difference and the COEFFICIENT K of said two input signals, and wherein K is more than or equal to 1;
Adder, one input end receive the said first output signal, and another input receives the detection signal of said power network current, produce the second output signal;
Fast amplifier, one input end receive the said second output signal, and another input receives first reference signal; And
The low pressure metal-oxide-semiconductor, its grid connects the output of said fast amplifier, and its drain electrode connects the source electrode of said high-voltage power pipe, and its source electrode detects resistance through one and is connected to reference to ground.
9. device as claimed in claim 8 is characterized in that, said error amplifying circuit comprises error amplifier and the loop compensation network of being made up of resistance and electric capacity, wherein,
Said error amplifier first input end receives the detection signal of said power network current through loop compensation resistance, and second input receives second reference signal, and its output produces said error signal through amplifying;
Loop compensation electric capacity is connected between the node and said error amplifier output between said error amplifier first input end and the loop compensation resistance.
10. device as claimed in claim 9; It is characterized in that; Said controller also comprises thermal-shutdown circuit; It is according to the detection signal of the said power network current of Temperature Treatment of said controller, and the detection signal after will handling offers adder and the error amplifier in the error amplifying circuit in the said power network current control circuit.
11. device as claimed in claim 10; It is characterized in that; Said thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, first diode and the 3rd resistance; Wherein, an input of said operational transconductance amplifier receives the output signal of said temperature sensor, and its another input receives the 3rd reference signal; Its output connects an end of the 3rd resistance through said first diode, and the other end of the 3rd resistance connects the source electrode of said low pressure metal-oxide-semiconductor and detects the node between the resistance.
12., it is characterized in that under the condition that electric property allows, said high-voltage power pipe and controller are as close as possible on circuit board like claim 10 or 11 described devices.
13., it is characterized in that said high-voltage power pipe and controller are positioned at an integrated circuit encapsulation like claim 10 or 11 described devices.
14. device as claimed in claim 11; It is characterized in that; Said device also comprises second diode between said current source loads and high-voltage power pipe, and the positive pole of said second diode is connected with current source loads, and its negative pole is connected with the drain electrode of said high-voltage power pipe.
15. device as claimed in claim 11; It is characterized in that; Said device comprises that also one is positioned at the outside electric capacity of said controller, and an end of said electric capacity is connected to reference to ground, and the other end is connected to the node between the source electrode of drain electrode and high-voltage power pipe of said low pressure metal-oxide-semiconductor.
16. a lighting is characterized in that, comprises each described device and LED load in the claim 7 to 15.
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| CN2012101713806A CN102711328A (en) | 2012-05-30 | 2012-05-30 | Linear constant-current controller |
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| CN2012101713806A CN102711328A (en) | 2012-05-30 | 2012-05-30 | Linear constant-current controller |
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Application publication date: 20121003 |