CN202652627U - Linear constant current controller - Google Patents
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Abstract
The utility model discloses a linear constant current controller. The linear constant current controller comprises a chip of the controller, a driving device and a lighting lamp. The controller is connected to a source electrode of a high voltage power tube. A drain electrode of the high voltage power tube is connected to an input voltage source through a constant current source load. The input voltage source provides a unidirectional pulse network voltage for rectifying an alternating current network voltage. A first resistor and a second resistor are connected in series between the input voltage source and a power supply terminal of the controller. A grid electrode of the high voltage power tube is connected to a node between the first resistor and the second resistor. The controller comprises a network current control circuit and an error amplification circuit. The network current control circuit is based on a voltage dividing signal from the input voltage source and an amplified error signal, and is controlled to acquire the network current in a current acquisition window of the unidirectional pulse network voltage. The error amplification circuit is based on a detection signal of the network current flowed from the network current control circuit, determines the average current of the network current, and generates the amplified error signal. According to the utility model, the manufacture cost of the linear constant current controller and the corresponding driving device is obviously reduced, and the application flexibility of the linear constant current controller and the corresponding driving device is substantially enhanced.
Description
Technical field
The utility model relates to the Linear constant-current controller circuit, in particular to a kind of high-efficient linear constant-current controller for driving current source loads, comprises chip and the drive unit of this controller, and the lighting that comprises described drive unit.
Background technology
Because have the light efficiency height, the life-span is long, radiationless and the 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, the controller that LED need to be different from the constant pressure source load.At present, industrial quarters mainly contains the controller of two large class driving LED.One class is the switch constant-current controller, and main feature need to be inductance and transformer, and efficient generally all realizes highlyer 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, although efficient is difficult to realize highly under certain conditions, cost is relatively low.
In applicant's 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 for after resistance 205 and resistance 206 dividing potential drops controller 200; The second the tunnel gives electric capacity 204 chargings through resistance 103, and electric capacity 204 provides Power supply for controller 200; Third Road enters the drain electrode of controller 200 internal power field effect transistor 201 through behind LED load 190 and the electric capacity 185, flows out after testing resistance 202 to reference to ground from the source electrode of power field effect pipe 201 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 obtaining current 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, so that 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 obtaining current; The 3rd, the slope that the power network current at line voltage window upper limit place descends/rises.
Based on the detection signal CS of the power network current that flows out through power network current control circuit 220, error amplifying circuit 230 determines the average current of power network current, and the average current of namely LED load 190 is exported the error signal EAO through amplifying simultaneously.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 the error signal EAO through amplifying, and produces output signal SUBO, the voltage of this output signal is the product of 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 connects VIN through LED load 190, and its source electrode after testing resistance 202 is connected to reference to ground.
Error amplifying circuit 230 comprises error amplifier (EA) 214 and the loop compensation network that is comprised 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 the 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, simultaneously so that the frequency loop bandwidth much smaller than the frequency 100Hz of VIN, to realize average constant current.
Although 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 field effect transistor 201 is positioned at the inside of controller 200, because the superhigh pressure integrated circuit fabrication process is complicated, causes manufacturing cost higher.And at modern microelectronic, manufacturing cost has almost determined the success or failure of integrated circuit (IC) products, is the constant theme of microelectronic industry so pursue low manufacturing cost.
The utility model content
For defects, the purpose of this utility model is, reduces the manufacturing cost of existing Linear constant-current controller and respective drive device, and improves their application flexibility and thermal safety.
Above-mentioned purpose of the present utility model realizes by device and lighting that Linear constant-current controller, chip, driving current source loads are provided.
According to first aspect of the present utility model, a kind of Linear constant-current controller is provided, described controller links to each other with the source electrode of a high-voltage power pipe, the drain electrode of described high-voltage power pipe is connected to input voltage source through current source loads, described input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, the first resistance, the second resistance is connected in series between the power end of described input voltage source and controller, the grid of described high-voltage power pipe connects the first resistance, node between the second resistance, described controller comprises: the power network current control circuit, based on one from the voltage division signal of described input voltage source with once the error signal of amplifying, be controlled in the obtaining current window of described 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 described power network current control circuit, determine the average current of described power network current, and produce described error signal through amplifying.
In first aspect, preferably, described power network current control circuit comprises: subtracter, one input end receives the voltage division signal from described input voltage source, another input receives described error signal through amplifying, produce the first output signal, the voltage of described the first output signal is the product of voltage difference and the COEFFICIENT K of described two input signals, and wherein K is more than or equal to 1; Adder, one input end receive described the first output signal, and another input receives the detection signal of described power network current, produce the second output signal; Fast amplifier, one input end receive described the second output signal, and another input receives the first reference signal; And the low pressure metal-oxide-semiconductor, its grid connects the output of described fast amplifier, and its drain electrode connects the source electrode of described high-voltage power pipe, and its source electrode detects resistance through one and is connected to reference to ground.
Preferably, described error amplifying circuit comprises error amplifier and the loop compensation network that is comprised of resistance and electric capacity, wherein, described error amplifier first input end receives the detection signal of described power network current through loop compensation resistance, the second input receives the second reference signal, and its output produces described error signal through amplifying; Loop compensation electric capacity is connected between the node and described error amplifier output between described error amplifier first input end and the loop compensation resistance.
Preferably; described controller also comprises thermal-shutdown circuit; it is according to the detection signal of the described power network current of Temperature Treatment of described controller, and the detection signal after will processing offers adder in the described power network current control circuit and the error amplifier in the error amplifying circuit.
Preferably; described thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, diode and the 3rd resistance; wherein; one input of described operational transconductance amplifier receives the output signal of described temperature sensor; its another input receives the 3rd reference signal; its output connects an end of the 3rd resistance through described diode, and the other end of the 3rd resistance connects the source electrode of described low pressure metal-oxide-semiconductor and detects 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, comprise Linear constant-current controller, the high-voltage power pipe, the first resistance and the second resistance, wherein, described controller links to each other with the source electrode of high-voltage power pipe, the drain electrode of described high-voltage power pipe is connected to input voltage source through current source loads, described input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, described the first resistance, the second resistance is connected in series between the power end of described input voltage source and controller, the grid of described high-voltage power pipe connects the first resistance, node between the second resistance, described controller comprises: the power network current control circuit, based on one from the voltage division signal of described input voltage source with once the error signal of amplifying, be controlled in the obtaining current window of described 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 described power network current control circuit, determine the average current of described power network current, and produce described error signal through amplifying.
In the third aspect, preferably, described power network current control circuit comprises: subtracter, one input end receives the voltage division signal from described input voltage source, another input receives described error signal through amplifying, produce the first output signal, the voltage of described the first output signal is the product of voltage difference and the COEFFICIENT K of described two input signals, and wherein K is more than or equal to 1; Adder, one input end receive described the first output signal, and another input receives the detection signal of described power network current, produce the second output signal; Fast amplifier, one input end receive described the second output signal, and another input receives the first reference signal; And the low pressure metal-oxide-semiconductor, its grid connects the output of described fast amplifier, and its drain electrode connects the source electrode of described high-voltage power pipe, and its source electrode detects resistance through one and is connected to reference to ground.
Preferably, described error amplifying circuit comprises error amplifier and the loop compensation network that is comprised of resistance and electric capacity, wherein, described error amplifier first input end receives the detection signal of described power network current through loop compensation resistance, the second input receives the second reference signal, and its output produces described error signal through amplifying; Loop compensation electric capacity is connected between the node and described error amplifier output between described error amplifier first input end and the loop compensation resistance.
Preferably; described controller also comprises thermal-shutdown circuit; it is according to the detection signal of the described power network current of Temperature Treatment of described controller, and the detection signal after will processing offers adder in the described power network current control circuit and the error amplifier in the error amplifying circuit.
Preferably; described thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, the first diode and the 3rd resistance; wherein; one input of described operational transconductance amplifier receives the output signal of described temperature sensor; its another input receives the 3rd reference signal; its output connects an end of the 3rd resistance through described the first diode, and the other end of the 3rd resistance connects the source electrode of described low pressure metal-oxide-semiconductor and detects node between the resistance.
Preferably, under the condition that electric property allows, described high-voltage power pipe and controller are as close as possible on circuit board.
Preferably, described high-voltage power pipe and controller are positioned at an integrated antenna package.
Preferably, described device also comprises the second diode between described current source loads and high-voltage power pipe, and the positive pole of described the second diode is connected with current source loads, and its negative pole is connected with the drain electrode of described high-voltage power pipe.
Preferably, described device comprises that also one is positioned at the electric capacity of described controller outside, and an end of described electric capacity is connected to reference to ground, and the other end is connected to the node between the source electrode of the drain electrode of described low pressure metal-oxide-semiconductor and high-voltage power pipe.
According to fourth aspect, a kind of lighting is provided, it is characterized in that, comprise the device described in the above-mentioned third aspect and LED load.
The utility model overcomes the obstacle of technical realization, and innovation ground is separated high-voltage power pipe and controller circuitry, thereby so that the manufacturing cost of Linear constant-current controller and respective drive device descends about 50%.And, according to the utility model, because selecting various types of power tubes, obviously strengthened the application flexibility of Linear constant-current controller and drive unit.For example, can select according to actual needs the power tube of various voltage specifications, the power tube of various current specification, perhaps the power tube of various packing forms.If ac grid voltage is high, just select withstand voltage high power tube; If output current is large, just select the large power tube of output current ability.
Description of drawings
For understanding better the utility model, hereinafter the utility model is described in further detail by reference to the accompanying drawings 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 the utility model one embodiment;
Fig. 3 is the electrical block diagram of the Linear constant-current controller of another embodiment of the utility model;
Fig. 4 shows a kind of specific 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 the utility model one embodiment, and identical Reference numeral is indicated identical components and parts all the time.Different from existing linear constant current scheme shown in Figure 1 is, the power field effect pipe 201 of Fig. 1 middle controller 200 inside is 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 levels are linked togather.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 by LED load 190, its grid contact resistance 103 and the node between 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.
By the resistance ratio of change resistance 109 with resistance 103, but the grid voltage of free adjustment high-voltage power pipe 201b, and expression is as follows.
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 regulating power pipe 201b and low pressure metal-oxide-semiconductor 201a between power division, the grid voltage setting of power tube 201b is higher, (it is just larger 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 larger.Like this, can suitably alleviate the heat radiation difficulty of power tube 201b.Because 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 arranges highlyer, and then the voltage born of metal-oxide-semiconductor 201a is just higher, and the power that 201a bears is also just higher, and the power born of power tube 201b is just less so.
Generally speaking, power tube 201b is bearing most of power consumption of system.Power consumption is large, will produce a lot of heats unavoidably, causes the working temperature of power tube 201b higher.If working temperature surpasses 150 degrees centigrade, will affect the life-span of power tube; As surpassing 200 degrees centigrade, the life-span of power tube may only have several hours, even moment burns.Consider this point, preferably, a thermal-shutdown circuit can be set in controller inside, indirectly to protect power tube 201b.With reference to Fig. 3, Fig. 3 is the electrical block diagram of the Linear constant-current controller of another embodiment of the utility model.Be provided with thermal-shutdown circuit 310 in the controller 300.The detection signal CS of power network current outputs to adder 212 among the power network current control circuit 220a with the CSOTP signal again after excess temperature protective circuit 310 is processed, and outputs to the error amplifier 214 in the error amplifying circuit 230.Therefore, the CSOTP signal had both contained real output current information CS, contained again the temperature information of controller 300, after the information of this two aspect is processed through specific functional relation, just can reach the purpose of overheat protector.
Fig. 4 shows a kind of specific 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 by diode 313, and the other end of resistance 314 is connected to node CS.
The effect of diode 313 is one-way conductions, this means, it is to flow out just effectively that operational transconductance amplifier 312 only has output current, that is, only have 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 (this threshold value is decided by REFT) of setting; because stopping of diode 313; 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.Only have 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 larger, and CS voltage will be less, just means that also system's output current can be less.
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 as shown in Figure 5.System starts shooting constantly at t1, and system temperature slowly raises after the start, and the output PTAT voltage of temperature sensor 311 also linear ratio rises.After PTAT voltage is raised to VREFT (that is, system temperature has reached the overheat protector critical point), be the t2 moment 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 t2 after the moment represents not establish the temperature rising curve of thermal-shutdown circuit 310, and as seen, temperature can constantly rise, until 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.The constantly rear output current of t3 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 as follows.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 in the constant situation of condition, the total power consumption that both add up is substantially constant, as mentioned before, can realize that by 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 closelyer, and the heat of biography is 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 heat couple coefficient, expresses the degree of strength of thermal coupling between power tube 201b and the controller 300, and C is larger, and thermal coupling is stronger.K
300Be thermal resistivity, express the heat-sinking capability of controller 300, heat-sinking capability is poorer, K
300Larger.K
201bBe the thermal resistivity of power tube 201b, similarly, heat-sinking capability is poorer, K
201bLarger.T
AIt is the ambient temperature of system works.As seen, the thermal equilibrium temperature of controller 300 is relevant with six aspect factors, and 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)
By formula 4 as seen, 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, as shown in Equation 5.
T
300＝K
300＊P
201a+C＊(T
201b-T
A)+T
A (5)
As seen, by the maximum operating temperature of restriction controller 300, can realize indirectly power tube 201b being carried out overheat protector fully.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, similarly, 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, represents stronger thermal coupling, and this just requires power tube 201b and controller 300 spatially at a distance of very near.This point is more easily understood; controller 300 will provide effective overheat protector to power tube 201b, just needs as far as possible the exactly temperature of perception power tube 201b, 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.In the utility model, preferably, can adopt one of following dual mode to come so that the two is spatially close.A kind of mode is on circuit board, under the condition that electric property allows, to make power tube 201b and controller 300 as close as possible, so that thermal coupling is as far as possible strong.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 the integrated antenna package, like this, heat couple coefficient C can 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, described thermal-shutdown circuit also can adopt other forms of circuit structure, as long as can realize previously described overheat protector principle.This is understandable to those skilled in the art.
Referring again to Fig. 4, preferably, can between LED load 190 and high-voltage power pipe 201b, diode 201c be set, 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 negative current, may cause controller 300 to work.And utilize the one-way conduction characteristic of diode 201c, just can effectively avoid negative current to the interference of 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 connection 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 utility model described here can have many variations, and this variation can not be thought and departs from spirit and scope of the present utility model.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, described controller links to each other with the source electrode of a high-voltage power pipe, the drain electrode of described high-voltage power pipe is connected to input voltage source through current source loads, described input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, the first resistance, the second resistance are connected in series between the power end of described input voltage source and controller, the grid of described high-voltage power pipe connects the node between the first resistance, the second resistance, and described controller comprises:
The power network current control circuit based on one from the voltage division signal of described input voltage source with once the error signal of amplifying, is controlled in the obtaining current window of described 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 described power network current control circuit, is determined the average current of described power network current, and produces described error signal through amplifying.
2. controller as claimed in claim 1 is characterized in that, described power network current control circuit comprises:
Subtracter, one input end receives the voltage division signal from described input voltage source, another input receives described error signal through amplifying, produce the first output signal, the voltage of described the first output signal is the product of voltage difference and the COEFFICIENT K of described two input signals, and wherein K is more than or equal to 1;
Adder, one input end receive described the first output signal, and another input receives the detection signal of described power network current, produce the second output signal;
Fast amplifier, one input end receive described the second output signal, and another input receives the first reference signal; And
The low pressure metal-oxide-semiconductor, its grid connects the output of described fast amplifier, and its drain electrode connects the source electrode of described 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, described error amplifying circuit comprises error amplifier and the loop compensation network that is comprised of resistance and electric capacity, wherein,
Described error amplifier first input end receives the detection signal of described power network current through loop compensation resistance, and the second input receives the second reference signal, and its output produces described error signal through amplifying;
Loop compensation electric capacity is connected between the node and described error amplifier output between described error amplifier first input end and the loop compensation resistance.
4. controller as claimed in claim 3; it is characterized in that; described controller also comprises thermal-shutdown circuit; it is according to the detection signal of the described power network current of Temperature Treatment of described controller, and the detection signal after will processing offers adder in the described power network current control circuit and the error amplifier in the error amplifying circuit.
5. controller as claimed in claim 4; it is characterized in that; described thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, diode and the 3rd resistance; wherein; one input of described operational transconductance amplifier receives the output signal of described temperature sensor; its another input receives the 3rd reference signal, and its output connects an end of the 3rd resistance through described diode, and the other end of the 3rd resistance connects the source electrode of described low pressure metal-oxide-semiconductor and detects 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, the high-voltage power pipe, the first resistance and the second resistance, wherein, described controller links to each other with the source electrode of high-voltage power pipe, the drain electrode of described high-voltage power pipe is connected to input voltage source through current source loads, described input voltage source provides the unidirectional pulsation line voltage to the ac grid voltage rectification, described the first resistance, the second resistance is connected in series between the power end of described input voltage source and controller, the grid of described high-voltage power pipe connects the first resistance, node between the second resistance, described controller comprises:
The power network current control circuit based on one from the voltage division signal of described input voltage source with once the error signal of amplifying, is controlled in the obtaining current window of described 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 described power network current control circuit, is determined the average current of described power network current, and produces described error signal through amplifying.
8. device as claimed in claim 7 is characterized in that, described power network current control circuit comprises:
Subtracter, one input end receives the voltage division signal from described input voltage source, another input receives described error signal through amplifying, produce the first output signal, the voltage of described the first output signal is the product of voltage difference and the COEFFICIENT K of described two input signals, and wherein K is more than or equal to 1;
Adder, one input end receive described the first output signal, and another input receives the detection signal of described power network current, produce the second output signal;
Fast amplifier, one input end receive described the second output signal, and another input receives the first reference signal; And
The low pressure metal-oxide-semiconductor, its grid connects the output of described fast amplifier, and its drain electrode connects the source electrode of described 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, described error amplifying circuit comprises error amplifier and the loop compensation network that is comprised of resistance and electric capacity, wherein,
Described error amplifier first input end receives the detection signal of described power network current through loop compensation resistance, and the second input receives the second reference signal, and its output produces described error signal through amplifying;
Loop compensation electric capacity is connected between the node and described error amplifier output between described error amplifier first input end and the loop compensation resistance.
10. device as claimed in claim 9; it is characterized in that; described controller also comprises thermal-shutdown circuit; it is according to the detection signal of the described power network current of Temperature Treatment of described controller, and the detection signal after will processing offers adder in the described power network current control circuit and the error amplifier in the error amplifying circuit.
11. device as claimed in claim 10; it is characterized in that; described thermal-shutdown circuit comprises temperature sensor, operational transconductance amplifier, the first diode and the 3rd resistance; wherein; one input of described operational transconductance amplifier receives the output signal of described temperature sensor; its another input receives the 3rd reference signal; its output connects an end of the 3rd resistance through described the first diode, and the other end of the 3rd resistance connects the source electrode of described low pressure metal-oxide-semiconductor and detects node between the resistance.
12., it is characterized in that under the condition that electric property allows, described high-voltage power pipe and controller are as close as possible on circuit board such as claim 10 or 11 described devices.
13., it is characterized in that described high-voltage power pipe and controller are positioned at an integrated antenna package such as claim 10 or 11 described devices.
14. device as claimed in claim 11, it is characterized in that, described device also comprises the second diode between described current source loads and high-voltage power pipe, and the positive pole of described the second diode is connected with current source loads, and its negative pole is connected with the drain electrode of described high-voltage power pipe.
15. device as claimed in claim 11, it is characterized in that, described device comprises that also one is positioned at the electric capacity of described controller outside, and an end of described electric capacity is connected to reference to ground, and the other end is connected to the node between the source electrode of the drain electrode of described low pressure metal-oxide-semiconductor and high-voltage power pipe.
16. a lighting is characterized in that, comprises each described device and LED load in the claim 7 to 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220246015 CN202652627U (en) | 2012-05-30 | 2012-05-30 | Linear constant current controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220246015 CN202652627U (en) | 2012-05-30 | 2012-05-30 | Linear constant current controller |
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| CN 201220246015 Expired - Fee Related CN202652627U (en) | 2012-05-30 | 2012-05-30 | Linear constant current controller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711328A (en) * | 2012-05-30 | 2012-10-03 | 许瑞清 | Linear constant-current controller |
| CN103929865A (en) * | 2014-05-07 | 2014-07-16 | 许瑞清 | Apfc constant current controller integrated circuit |
| CN105282896A (en) * | 2014-05-27 | 2016-01-27 | 宁波高新区赛尔富电子有限公司 | Power supply control circuit of LED lamp |
| CN106211485A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Current control circuit and apply its LED drive circuit |
| CN109496040A (en) * | 2018-11-20 | 2019-03-19 | 广州市力驰微电子科技有限公司 | Great power LED linear constant current drive control chip |
-
2012
- 2012-05-30 CN CN 201220246015 patent/CN202652627U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711328A (en) * | 2012-05-30 | 2012-10-03 | 许瑞清 | Linear constant-current controller |
| CN103929865A (en) * | 2014-05-07 | 2014-07-16 | 许瑞清 | Apfc constant current controller integrated circuit |
| CN103929865B (en) * | 2014-05-07 | 2016-09-28 | 许瑞清 | APFC constant-current controller integrated circuit |
| CN105282896A (en) * | 2014-05-27 | 2016-01-27 | 宁波高新区赛尔富电子有限公司 | Power supply control circuit of LED lamp |
| CN106211485A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | Current control circuit and apply its LED drive circuit |
| CN109496040A (en) * | 2018-11-20 | 2019-03-19 | 广州市力驰微电子科技有限公司 | Great power LED linear constant current drive control chip |
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Effective date of registration: 20180615 Address after: 528400, Cao two Changan road 54, Guzhen Town, Zhongshan, Guangdong, Changan, with seventh cards on the South Road first phase. Patentee after: Zhongshan model electrical and Electronic Technology Co., Ltd. Address before: 100190 201 3 Zhongguancun East Road, Haidian District, Beijing 201 Patentee before: Xu Ruiqing |
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