CN101945520B - Power conversion circuit and controller - Google Patents
Power conversion circuit and controller Download PDFInfo
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- CN101945520B CN101945520B CN 200910158702 CN200910158702A CN101945520B CN 101945520 B CN101945520 B CN 101945520B CN 200910158702 CN200910158702 CN 200910158702 CN 200910158702 A CN200910158702 A CN 200910158702A CN 101945520 B CN101945520 B CN 101945520B
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Abstract
The invention discloses a power supply conversion circuit and a controller. The controller receives power required by operation through a driving voltage end and is used for controlling a conversion circuit to convert an input voltage into an output voltage. The controller latches upon the occurrence of a circuit anomaly to cease providing some or all of the functionality until the input power is removed. Therefore, the problems of the prior art that the service life of the element is shortened and the use safety of a user is doubtful can be avoided.
Description
Technical field
The present invention relates to a kind of power-switching circuit and controller thereof, relate in particular to a kind of power-switching circuit and controller thereof with latch protection function.
Background technology
Power supply unit now mainly can be divided into two kinds of linear formula and switched power supplies.The circuit of linear formula power supply unit is simple, ripple is little, electromagnetic interference is little, yet electronic component is bigger, so the circuit volume is big and Heavy Weight, and conversion efficiency is low.Though the switched power supply circuit is complicated, and ripple is bigger, electromagnetic interference is also bigger, the little advantage of power consumption when conversion efficiency height, zero load are arranged, the market of present power supply unit is to be main flow with the switched power supply.
Fig. 1 is for having the circuit diagram in order to the switched power supply that drives fluorescent tube now.Switched power supply comprises an initial resistance R, an initial capacitance C2, Zener diode (ZenerDiode) Z, a controller CON, a high-side driver capacitor C 1, a high-side driver transformer T1, a high side transistor switch M1, a low side transistor switch M2, a diode D, an output capacitance C3 and a transformer T2, in order to a direct current input voltage VIN is converted to an ac output voltage VOUT to drive a fluorescent tube LAMP.
After DC input voitage VIN input, provide current to initial capacitance C2 by initial resistance R, make the cross-pressure of initial capacitance C2 begin to rise to till the breakdown voltage that equals Zener diode Z.Initial capacitance C2 produces a driving voltage VDD to provide controller CON operation required electric power.After surpassing the starting resistor value of controller CON, driving voltage VDD begins to start, producing the signal of control high side transistor switch M1 and low side transistor switch M2, its middle controller CON is increased to suitable level with control high side transistor switch M1 by high-side driver capacitor C 1 and high-side driver transformer T1 with the level of control signal.By the switching of high side transistor switch M1 and low side transistor switch M2, it is luminous to drive fluorescent tube LAMP to produce ac output voltage VOUT that the electric power of DC input voitage VIN will be sent to output.And transformer T2 electrically connects ac output voltage and by output power after the diode D rectification to initial capacitance C2.
Electric power by initial resistance R starts preceding required electric power as yet greater than controller CON, therefore can make initial capacitance C2 store electric power gradually.And after the controller CON startup, also provide electrical power to controller CON by transformer T2 and diode D.Therefore initial resistance R can use bigger resistance value, to reduce the power loss of initial resistance R.Yet, when circuit occurs making DC input voitage VIN can't provide electrical power to ac output voltage VOUT unusually, make transformer T2 and diode D that electric power can't be provided and whole electric power of providing controller CON normal running required are provided for electric power by initial resistance R, will make the operation generation problem of controller CON.
Fig. 3 (a) for existing in order to the switched power supply that the drives fluorescent tube signal waveform schematic diagram when the circuit abnormality.After being higher than starting resistor value UVLO, driving voltage VDD begins operation, because the oscillator (clocking OSC) of controller CON inside and control circuit begin action, this moment, consumed current can be much larger than the electric current that provides through resistance R by DC input voitage VIN, so the voltage of driving voltage VDD can begin to descend.Under the circuit working normal condition, because controller CON meeting output signal control high side transistor switch M1 and low side transistor switch M2 switch, output voltage VO UT is risen and begins to provide electrical power to driving voltage VDD via transformer T2 and diode D.Yet when circuit abnormal, controller CON can stop the switching of high side transistor switch M1 and low side transistor switch M2, makes output voltage VO UT decline and can't provide electrical power to driving voltage VDD again, and cause driving voltage VDD can begin to descend.When driving voltage VDD is reduced to the minimum voltage value of controller CON allowable operations, controller CON shut-down operation, therefore driving voltage VDD again bottom out to starting resistor value UVLO, controller CON is restarted again, the state that so goes round and begins again until circuit abnormality is excluded.Perhaps, existing lamp tube drive circuit extinguishes fluorescent tube LAMP for fear of possible temporary transient circuit abnormality, also can make controller CON constantly attempt lighting again fluorescent tube LAMP.And this process not only can consume lighting number of times restriction and shortening lamp tube service life of fluorescent tube, and if the user changes the danger that fluorescent tube also has electric shock forgetting under the powered-down.Therefore existing switched power supply, especially lamp tube drive circuit have the problem that constantly restarts, and not only cause the reduction in useful life of circuit element, and the problem that causes the user to use security concerns is also arranged.
Summary of the invention
In view of the problems of the prior art, power-switching circuit of the present invention and controller thereof with regard to the breech lock controller, make controller can't provide part or all of function till the input power supply is removed when circuit abnormality takes place.Can avoid like this in the prior art owing to the reduction in useful life of restarting the element that change-over circuit causes and the problem that the user uses security concerns.
For achieving the above object, the invention provides a kind of controller, bring drill to an end by a driving voltage termination and make required electric power, and convert an input voltage to an output voltage in order to control a change-over circuit.Above-mentioned controller has comprised a start unit, a control unit and a latch lock unit.Start unit electrically connects the driving voltage end, and produces an enabling signal after a driving voltage of driving voltage end is higher than one first predeterminated voltage.Control unit starts with the control change-over circuit after receiving enabling signal.Latch lock unit starts after electrically connecting the driving voltage end and receiving enabling signal, in case controller enters a protected mode, latch lock unit namely produces a latch-up signal.Control unit stops to the small part function to reduce the required electric power of operation after receiving latch-up signal, driving voltage is maintained on one second predeterminated voltage, the second wherein above-mentioned predeterminated voltage is a minimum operation voltage of latch lock unit, and second predeterminated voltage be lower than first predeterminated voltage, and control unit stops to the small part function to reduce the required electric power of operation after receiving latch-up signal, driving voltage is maintained on second predeterminated voltage.
The present invention also provides a kind of power-switching circuit, comprises a change-over circuit, a start-up circuit and a controller.Change-over circuit is in order to convert an input voltage to an output voltage to drive a load according at least one control signal.Start-up circuit electrically connects input voltage to produce a driving voltage.Controller electrically connects start-up circuit and output voltage is operated required electric power to receive; and according to driving voltage to determine whether to operate in a protected mode; then controller produces at least one control signal if not, if then controller stops to export at least one control signal and keeps and operates in protected mode.
The present invention also provides a kind of direct current to deliver the stream power-switching circuit, comprises a change-over circuit, a start-up circuit, a voltage conversion device and a controller.Change-over circuit is in order to convert a direct current input voltage to an ac output voltage to drive a load according at least one control signal.Start-up circuit electrically connects this DC input voitage to produce a driving voltage.Voltage conversion device electrically connects this ac output voltage, in order to this ac output voltage of rectification in order to provide one to drive electric power.Controller electrically connects this start-up circuit and this voltage conversion device is operated required electric power to receive; and according to this driving voltage to determine whether to operate in a protected mode; then this controller produces this at least one control signal if not, if then this controller stops this at least one control signal of output and keep operating in this protected mode.
Above general introduction and ensuing detailed description are all exemplary in nature, are in order to further specify claim of the present invention.And relevant other objects and advantages of the present invention will be set forth in follow-up explanation and diagram.
Description of drawings
Fig. 1 is for having the circuit diagram in order to the switched power supply that drives fluorescent tube now.
Fig. 2 is the circuit box schematic diagram according to a power-switching circuit of the present invention.
Fig. 3 (a) for existing in order to the switched power supply that the drives fluorescent tube signal waveform schematic diagram when the circuit abnormality.
Fig. 3 (b) is according to the signal waveform schematic diagram in the power-switching circuit of the present invention.
Fig. 4 is the circuit diagram according to one first preferred embodiment of power-switching circuit of the present invention.
Fig. 5 (a) and Fig. 5 (b) are the circuit diagram according to one second preferred embodiment of power-switching circuit of the present invention.
The main element symbol description:
Initial resistance-R initial capacitance-C2
Zener diode-Z controller-CON
High-side driver electric capacity-C1 high-side driver transformer-T1
High side transistor switch-M1 low side transistor switch-M2
Diode-D output capacitance-C3
Transformer-T2 DC input voitage-VIN
Ac output voltage-VOUT fluorescent tube-LAMP
Start-up circuit-5,105,205 start units-10,110,210
Latch lock unit-20,120,220 voltage stabilizing elements-30,130,230
Function element-35,135,235 control units-40,140,240
Voltage conversion device-50,150,250 feedback circuits-60
Change-over circuit-70,170,270 controllers-100,100a
Monostable circuit-122 drives over-pressure safety device-132
First feedback circuit-160a, 260a second feedback circuit-160b, 260b
Over-temperature protection device-136,236 processing unit-138,238
Or door-139 clock-generating devices-141,241
Cross zero crossing arrangement for detecting-142 error amplification device-144,244
Overcurrent protective device-146,246 over-pressure safety devices-148,247
Light-emitting diode (LED) module-180 self-hold circuit-222
Latch protection circuit-224 counter-231
Warm-up time device-243 frequency sweep control device-245
Undercurrent protection device-248 under-voltage protection device-249
Fluorescent tube-280 first filament-280a
Circuit-290 is restarted in second filament-280b load
Restart unit-295 and drive electric capacity-C4
Charging capacitor-C5 enable signal-EN
Feedback signal-FB latch-up signal-LATCH
Clock signal-OSC enabling signal POR
Guard signal-PROT control signal-S
First control signal-S1 second control signal-S2
Input voltage-Vin driving voltage-VDD
Output voltage-Vout operating voltage-VCC
Driving voltage end-VT operating voltage-VCC
Voltage feedback signal-VFB first predeterminated voltage-UVLO
Second predeterminated voltage-UV the 3rd predeterminated voltage-LATCHUP
Starting resistance-Rin current feedback signal-IFB
First switch-SW1 second switch-SW2
The 3rd switch-SW3 inductance-L
Output capacitance-Cout resonant capacitance-Cre
First resistance-R1 second resistance-R2
The 3rd resistance-R3 the 4th resistance-R4
The 5th resistance-R5 the 6th resistance-R6
The 7th resistance-R7 the 8th resistance-R8
The 9th resistance-R9 the tenth resistance-R10
Zener diode-Z1, Z2 hysteresis comparator-HY
The one SR type door bolt-SR1 the 2nd SR type door bolt-SR2
Restart Signal-Sre RS type door bolt-RS
Reference voltage level-Vpor voltage division signal-VDD '
Initialize signal-IN overheat protector signal-OTP
Cross zero crossing reference voltage signal-Vz and cross zero crossing detection signal-ZD
Error amplification signal-EA current reference signal-Vr
Cross flow reference signal-Vri, Vri1 overcurrent protection signal-OCP
Cross pressure reference signal-Vrv overvoltage protection signal-OVP
Driving transformer-T3 transformer-T4
The one P transistor npn npn switch-P1 the 2nd P transistor npn npn switch-P2
The 3rd P transistor npn npn switch-P3 the 4th P transistor npn npn switch-P4
The 5th P transistor npn npn switch-P5 the 6th P transistor npn npn switch-P6
The 7th P transistor npn npn switch-P7 the 8th P transistor npn npn switch-P8
The 9th P transistor npn npn switch-P9 first N-type transistor switch-N1
Second N-type transistor switch-N2 the 3rd N-type transistor switch-N3
The 4th N-type transistor switch-N4 the 5th N-type transistor switch-N5
The 6th N-type transistor switch-N6 NAND gate-NA
First reverser-INV1 second reverser-INV2
Self-sustaining drives signal-START current source-I1
Pre-thermal capacitance-the Ct of the tenth resistance-R10
Swept-frequency signal PR frequency sweep control signal-Fc
Cross flow reference signal-Vri1 undercurrent reference signal-Vri2
Cross the under-voltage reference signal-Vrv2 of pressure reference signal-Vrv1
Under-voltage protection signal-UVP drove pressure reference signal-Vvdd
Drive overvoltage protection signal-OVP '
Embodiment
Fig. 2 is the circuit box schematic diagram according to a power-switching circuit of the present invention.As shown in Figure 2, power-switching circuit comprises a start-up circuit 5, a change-over circuit 70 and a controller 100.Start-up circuit 5 electrically connects an input voltage vin producing a driving voltage VDD to controller 100, required voltage and electric power when providing controller 100 to start.Controller 100 electrically connects start-up circuit 5 and electrically connects an output voltage V out simultaneously operates required electric power to receive, and exports at least one control signal S.Change-over circuit 70 converts input voltage vin to output voltage V out according at least one control signal S, in order to drive a load (not shown).Controller 100 electrically connects start-up circuit 5 and output voltage V out operates required electric power to receive.If the magnitude of voltage of output voltage V out then can pass through a voltage conversion device 50 different with the required voltage of controller 100 operation, makes output voltage V out carry out step-down and/or rectification and is fit to controller 100 and operates required voltage to convert to.In addition, power-switching circuit can also comprise a feedback circuit 60, electrically connects output voltage V out to produce at least one feedback signal FB.Controller 100 can produce at least one control signal S according at least one feedback signal FB, with the running of control change-over circuit 70.
Controller 100 receives the required electric power of operation by a driving voltage end VT, and control change-over circuit 70 converts input voltage vin to output voltage V out.In the present embodiment, driving voltage end VT is electrically connected to input voltage vin and output voltage V out receiving electric power, and in the practical application, also can be electrically connected to other electric power supply system.Controller 100 comprises a start unit 10, a latch lock unit 20 and a control unit 40.Start unit 10 electrically connects driving voltage end VT, and judge whether the driving voltage VDD on the driving voltage end VT enough starts controller 100, judge namely whether driving voltage VDD is higher than one first predeterminated voltage, if then produce an enabling signal POR to latch lock unit 20.Latch lock unit 20 starts after electrically connecting driving voltage end VT and receiving enabling signal POR.Under controller 100 normal runnings; latch lock unit 20 is failure to actuate; right when power-switching circuit any circuit abnormality occurs and makes controller 100 enter a protected mode, latch lock unit 20 will produce a latch-up signal LATCH and make control unit 40 stop part or all of circuit to control unit 40 to operate to reduce and operate required electric power.In the present embodiment, control unit 40 has comprised a voltage stabilizing element 30 and a function element 35.Voltage stabilizing element 30 electrically connects driving voltage VDD and operates required electric power to produce an operating voltage VCC so that control unit 40 to be provided, and function element 35 produces control signal S according to feedback signal FB.Voltage stabilizing element 30 stops to provide operating voltage VCC after receiving latch-up signal LATCH, make function element 35 shut-down operations.
In the present embodiment, controller 100 required electric power are provided jointly by input voltage vin and output voltage V out.Before controller 100 does not start, for example: input voltage vin does not import as yet or controller 100 does not receive that as yet an enable signal starts, and controller 100 only needs the supply of electric power of trace to keep the operation of start unit 10.When input voltage vin voltage is enough high, make the enabling signal POR of start unit 10 output representative startups to latch circuit 20.In practical application, enabling signal POR also can make the circuit in the control unit 40 be come into operation by initial condition simultaneously as the replacement of control unit 40.Generally speaking, the electric power that input voltage vin provides by start-up circuit 5 only can provide the electric power of start unit 10 before controller 100 does not start, so can reduce the power loss that start-up circuit 5 causes, especially when input voltage vin during much larger than driving voltage VDD.After controller 100 started, output voltage V out rose and provides electrical power to driving voltage end VT by voltage conversion device 50, started the extra electricity needs that increases in back so that controller 100 to be provided.
When start-up course or normal running, circuit abnormality appears, for example: output voltage V out is greater than a predetermined output overvoltage value (Over Voltage Protection), output voltage V out was scheduled to low voltage value (Under Voltage Protection) less than one, driving voltage VDD is less than a predetermined under-voltage value (Under Voltage Lock-Out), driving voltage VDD is greater than a scheduled operation overpressure value (Over Voltage Protection), the electric current of load was scheduled to flow valuve (Over CurrentProtection) greater than one, the electric current of load was scheduled to low flow valuve less than one, and (Under Current Protection or system temperature are greater than predetermined value (Over Temperature Protection) etc., controller 100 stops to export control signal S, makes output voltage V out can't provide sufficient electric power to make the voltage of driving voltage VDD begin to descend to driving voltage end VT again.Fig. 3 (b) is according to the signal waveform schematic diagram in the power-switching circuit of the present invention.Shown in Fig. 3 (b), after driving voltage VDD exceeded one first predeterminated voltage UVLO, function element 35 beginning clocking OSC also came into operation.Yet, make driving voltage VDD begin to descend owing to output voltage V out can't provide controller 100 to start the required additional power in back.When driving voltage VDD dropped to one the 3rd predeterminated voltage LATCHUP, latch lock unit 20 output latch signal LATCH made control unit 40 stop part or all of circuit running, and as shown in FIG., clock signal OSC also stops to produce.At this moment, the required electric power of controller 100 operations will be less than or equal to the electric power that input voltage vin provides by start-up circuit 5, and driving voltage VDD will stop to descend or ging up.The 3rd predeterminated voltage LATCHUP is low than the first predeterminated voltage UVLO, but is higher than (or equaling) one second predeterminated voltage UV, and wherein the second predeterminated voltage UV is a minimum operation voltage of latch lock unit 20.Therefore; even if controller 100 enters protected mode; make output voltage V out can't provide electric power to controller 100 again; the present invention still makes driving voltage VDD maintain on the second predeterminated voltage UV; make latch lock unit 20 can continue the breech lock function, to avoid circuit in the prior art because of the problem of resetting or circuit design was caused that constantly restarts.
In addition, the driving voltage end VT of controller 100 also may electrically connect the power supply beyond input voltage vin or the output voltage V out, receiving electric power operation, and if when power supply has the abnormality of unstable power like this, also may cause controller 100 constantly to restart the problem of circuit.And controller of the present invention 100 enters protected mode and breech lock immediately if detect the situation that driving voltage VDD is lower than the 3rd predeterminated voltage LATCHUP, so also can avoid the problem that constantly restarts.Moreover, if controller 100 is to electrically connect different power supplys by two or more end points to receive required electric power, for example: an end points electrically connects input voltage vin providing electric power to start unit 10 and latch lock unit 20, and another end points electrically connects output voltage V out to provide electric power to control unit 40.When output voltage V out begins to descend because of circuit abnormality; output voltage V out because of cross low control unit 40 can't be operated before, control unit 40 can detect output voltage V out and export a guard signal PROT less than being scheduled to low voltage value and make latch lock unit 20 produce latch-up signal LATCH and reach the advantage of the invention described above to latch lock unit 20.
Moreover controller of the present invention can be applied to various power-switching circuits, and for example: DC-DC power supply change-over circuit, AC/DC power change-over circuit, direct current are delivered stream power-switching circuit etc., below just illustrates with several embodiment.
Fig. 4 is the circuit diagram according to one first preferred embodiment of power-switching circuit of the present invention.As shown in Figure 4, power-switching circuit comprises a controller 100a, a start-up circuit 105, a voltage conversion device 150, by a feedback circuit and a change-over circuit 170 that one first feedback unit 160a and one second feedback unit 160b constitute, convert an input voltage vin to an output voltage V out to drive a light-emitting diode (LED) module 180.Start-up circuit 105 comprises a starting resistance Rin and an electric capacity and a Zener diode in parallel, one end ground connection, and the other end electrically connects input voltage vin by starting resistance Rin.The resistance value of adjusting starting resistance Rin can be adjusted the power consumption of start-up circuit 105, and generally speaking, for the efficient of power-switching circuit integral body, the resistance value of starting resistance Rin can be set higher, to reduce the power consumption of start-up circuit 105.Behind input voltage vin input power-switching circuit, the electric capacity in the start-up circuit 105 begin to store electric power and produce a driving voltage VDD to controller 100a, required voltage and electric power when providing controller 100a to start.Voltage conversion device 150 is a rectifier diode, electrically connects output voltage V out, controller 100a and start-up circuit 105.When driving voltage VDD when going out voltage Vout, voltage conversion device 150 can avoid the electric power of input voltage vin to be input to change-over circuit 170 by starting resistance Rin.The first feedback unit 160a in the feedback circuit electrically connects output voltage V out, to produce a voltage feedback signal VFB who represents output voltage V out size, the second feedback unit 160b electrically connects light-emitting diode (LED) module 180, to produce generation surface low through the current feedback signal IFB of the size of current of light-emitting diode (LED) module 180.Change-over circuit 170 comprises one first switch SW 1, a second switch SW2, an inductance L and an output capacitance Cout.First switch SW 1 and second switch SW2 switch according to one first control signal S1 and one second control signal S2 respectively, the electric power that makes input voltage vin through the storage of inductance L and output capacitance Cout with convert output voltage V out to.
Controller 100a comprises a start unit 110, a latch lock unit 120 and a control unit 140.Start unit 110 electrically connects driving voltage VDD, and judges whether driving voltage surpasses a predeterminated voltage value, if then produce an enabling signal POR.Start unit 110 has comprised one first resistance R 1, one second resistance R 2, one the 3rd resistance R 3, one the 4th resistance R 4, a Zener diode Z1, a hysteresis comparator HY and one the one SR type door bolt (SR Lateh) SR1, and connects driving voltage VDD with the required electric power of receiving circuit operation.The 4th resistance R 4 connect with Zener diode Z1 the back and and the 3rd resistance R 3 be connected in parallel between driving voltage VDD and the ground connection, and export a reference voltage level Vpor to sluggish comparator HY at the 4th resistance R 4 and the tie point of Zener diode Z1.Before driving voltage VDD does not rise to the breakdown voltage that is higher than Zener diode Z1 as yet, reference voltage level Vpor rises with driving voltage VDD, and after rising to the breakdown voltage that is higher than Zener diode Z1 as driving voltage VDD, reference voltage level Vpor maintains the breakdown voltage value of Zener diode Z1.First resistance R 1 and second resistance R 2 are connected between driving voltage VDD and the ground connection, to produce a voltage division signal VDD ' to sluggish comparator HY.When driving voltage VDD rises to scheduled voltage, the level of voltage division signal VDD ' will be higher than reference voltage level Vpor and make an initialize signal INI to a SR type of hysteresis comparator HY output high level fasten SR1 and control unit 140 with a bolt or latch.After the S input of the one SR type door bolt SR1 receives the initialize signal INI of high level, produce the enabling signal of a high level to latch lock unit 120 at the Q end.
Function element 135 comprise one drive over-pressure safety device 132, an over-temperature protection device 136, a processing unit 138, one or door 139, one clock generation device 141, cross zero crossing arrangement for detecting 142, an error amplification device 144, an overcurrent protective device 146 and an over-pressure safety device 148, and after receiving initialize signal INI, start.One clock signal OSC is to processing unit 138 in clock-generating device 141 outputs.Drive over-pressure safety device 132 and receive the voltage division signal VDD ' and that first resistance R 1 and second resistance R 2 produce in the start units 110 and drove pressure reference signal Vvdd, when driving voltage VDD be higher than one default when driving overpressure value (be voltage division signal VDD ' be higher than drove pressure reference signal Vvdd) the output high level one drive overvoltage protection signal OVP '.The temperature of over-temperature protection device 136 detecting controller 100a, the overheat protector signal OTP of output high level when temperature surpasses a preset temperature.Cross the flow through size of current of second switch SW2 of zero crossing arrangement for detecting 142 detecting, contemporary surface low is through the detection signal level of the size of current of second switch SW2 during less than a zero crossing reference voltage signal Vz, a zero crossing detection signal ZD of output high level.Error amplification device 144 received current feedback signal IFB and a current reference signal Vr also export an error amplification signal EA accordingly.Overcurrent protective device 146 received current feedback signal IFB and one cross flow reference signal Vri, and export an overcurrent protection signal OCP of high level when current feedback signal IFB was higher than flow reference signal Vri.Over-pressure safety device 148 receives voltage feedback signal VFB and and crosses pressure reference signal Vrv, and exports an overvoltage protection signal OVP of high level when voltage feedback signal VFB was higher than pressure reference signal Vrv.Be low level and initialize signal INI when being high level at overheat protector signal OTP, overcurrent protection signal OCP and overvoltage protection signal OVP; function element 135 normal operations; processing unit 138 determines the work period of the first control signal S1 according to error amplification signal EA and clock signal OSC; and more determine according to zero crossing detection signal ZD work period of the second control signal S1 to make the current stabilization of the light-emitting diode (LED) module 180 of flowing through in a predetermined current value.Wherein arbitrary when being low level for high level or initialize signal INI when in overheat protector signal OTP, overcurrent protection signal OCP and overvoltage protection signal OVP; controller 100a enters protected mode; one guard signal PROT of processing unit 138 output high level is to latch lock unit 120; the latch-up signal LATCH of latch lock unit 120 output high level makes voltage regulation unit 130 stop output services voltage VCC with the operation of stop control unit 140.
Because start unit 110 and the required electric power of latch lock unit 120 operations are less than or equal to the electric power that input voltage vin provides by starting resistance Rin.Therefore; though when control unit 140 enters protected mode and shut-down operation because of circuit abnormality; output voltage V out can descend and can't provide electrical power to controller 100a simultaneously more at this moment; the electric power that input voltage vin provides by starting resistance Rin still can make driving voltage VDD no longer descend even go up; guarantee that driving voltage VDD is when controller 100a enters protected mode; also maintain on the minimum operation voltage of latch lock unit 20 and make latch circuit 20 still breech locked live the operation of controller 100a, to avoid the problem of repeated priming.
Fig. 5 (a) and Fig. 5 (b) are the circuit diagram according to one second preferred embodiment of power-switching circuit of the present invention.Shown in Fig. 5 (a) and Fig. 5 (b), power-switching circuit comprises a controller, a start-up circuit 205, a voltage conversion device 250, by a feedback circuit and a change-over circuit 270 that one first feedback unit 260a and one second feedback unit 260b constitute, convert an input voltage vin to an output voltage V out to drive a fluorescent tube 280.Start-up circuit 205 comprises an electric capacity in parallel and a Zener diode and electrically connects a starting resistance Rin of input voltage vin, one end ground connection, and the other end electrically connects input voltage vin by a starting resistance Rin.Behind input voltage vin input power-switching circuit, the electric capacity in the start-up circuit 205 begin to store electric power and produce a driving voltage VDD to controller, required voltage and electric power when providing controller to start.Voltage conversion device 250 comprises the primary side of a rectifier diode and a transformer T4, electrically connect output voltage V out, controller and start-up circuit 205, make output voltage convert suitable voltage to and after rectifies, provide one to drive electric power to controller through transformer T4.The first feedback unit 260a in the feedback circuit electrically connects output voltage V out, to produce a voltage feedback signal VFB who represents output voltage V out size, the second feedback unit 260b electrically connects fluorescent tube 280, to produce generation surface low through the current feedback signal IFB of the size of current of fluorescent tube 280.Controller comprises a start unit 210, a latch lock unit 220 and a control unit 240, produces one first control signal S1 and one second control signal S2 according to current feedback signal IFB and voltage feedback signal VFB.Change-over circuit 270 comprises the primary side of one first switch SW 1, a second switch SW2, a driving capacitor C 4, a driving transformer T3, an output capacitance Cout, a resonant capacitance Cre and a transformer T4, in order to convert an input voltage vin of direct current one output voltage V out of interchange to drive a fluorescent tube 280, for example: fluorescent lamp, fluorescent tube, cold cathode fluorescent lamp pipe etc. according to the first control signal S1 and the second control signal S2.
Shown in Fig. 5 (a), start unit 210 comprises one the one P transistor npn npn switch P 1, one the 2nd P transistor npn npn switch P 2, one the 3rd P transistor npn npn switch P 3, one first N-type transistor switch N1, one second N-type transistor switch N2, one the 3rd N-type transistor switch N3, one the 5th resistance R 5, one the 6th resistance R 6, one the 7th resistance R 7, one the 8th resistance R 8, one the 9th resistance R 9 and a Zener diode Z2.After driving voltage VDD begins to rise to the breakdown voltage that is higher than Zener diode Z2 by zero, the electric current of driving voltage VDD will be flowed through to ground by a P transistor npn npn switch P 1, Zener diode Z2, the 5th resistance R 5 and the 6th resistance R 6.When driving voltage VDD continues to rise again, the tie point voltage of the 5th resistance R 5 and the 6th resistance R 6 also rises thereupon, after surpassing the threshold voltage of the second N-type transistor switch N2, the second N-type transistor switch N2 conducting, this moment, the electric current of driving voltage VDD was also flowed through to ground by the 7th resistance R 7 and the second N-type transistor switch N2.Driving voltage VDD continues to rise, and makes the tie point voltage (i.e. the gate voltage of the second N-type transistor switch N2) of the 5th resistance R 5 and the 6th resistance R 6 continue to rise, and causes the electric current of flow through the 7th resistance R 7 and the second N-type transistor switch N2 to increase.When the electric current of the 7th resistance R 7 of flowing through is enough big, make the near threshold voltage that is lower than the 2nd P transistor npn npn switch P 2 and the 3rd P transistor npn npn switch P 3 under the voltage of the 7th resistance R 7 and the second N-type transistor switch N2 tie point.At this moment, the 2nd P transistor npn npn switch P 2 and 3 conductings of the 3rd P transistor npn npn switch P make the tie point of the 3rd P transistor npn npn switch P 3 and the 8th resistance R 8 produce an enabling signal POR of high level.And the driving voltage VDD of this moment (when start unit 210 produces the enabling signal POR of high level) is the first predeterminated voltage UVLO.
Latch lock unit 220 comprises a self-hold circuit 222, a latch protection circuit 224, RS type door bolt RS and a NAND gate NA; wherein self-hold circuit 222, a latch protection circuit 224 and RS type door bolt RS all electrically connect driving voltage VDD to receive the required electric power of operation, and latch protection circuit 224 then electrically connects an operating voltage VCC to receive the required electric power of operation.Self-hold circuit 222 comprises one first reverser INV1, one the 4th P transistor npn npn switch P 4, one the 5th P transistor npn npn switch P 5, one the 6th P transistor npn npn switch P 6, one the 7th P transistor npn npn switch P 7, one the 8th P transistor npn npn switch P 8, one the 9th P transistor npn npn switch P 9 and one the 4th N-type transistor switch N4.When driving voltage VDD behind liter above freezing, at first will by the series connection the 4th P transistor npn npn switch P 4, the 5th P transistor npn npn switch P 5, the 6th P transistor npn npn switch P 6 and the 7th P transistor npn npn switch P 7 make 8 conductings of the 8th P transistor npn npn switch P, namely when driving voltage VDD be higher than twice the P transistor npn npn threshold voltage but less than during the first predeterminated voltage UVLO.Subsequently, after the first reverser INV1 of self-hold circuit 222 received the enabling signal POR of high level and oppositely becomes low level signal, the 9th P transistor npn npn switch P 9 was with conducting and the 4th N-type transistor switch N4 closes and the self-sustaining of exporting high level drives signal START.In addition, the low level signal of the first reverser INV1 will make the 3rd N-type transistor switch N3 in the start unit 210 transfer to and close, the electric current of the 3rd P transistor npn npn switch P 3 of flowing through will be than preceding additional streams through the 9th resistance R 9, the tie point current potential of the 3rd P transistor npn npn switch P 3 and the 8th resistance R 8 is drawn high, do not changed because of noise to guarantee enabling signal POR.The self-sustaining of high level drives signal START with the conducting first N-type transistor switch N1 and by a P transistor npn npn switch P 1.And because the conducting of the first N-type transistor switch N1, the tie point voltage of the 5th resistance R 5 and the 6th resistance R 6 will drop to zero ends the second N-type transistor switch N2.After the second N-type transistor switch N2 ended, the tie point voltage of the second N-type transistor switch N2 and the 7th resistance R 7 rises to driving voltage VDD made the 2nd P transistor npn npn switch P 2 and the 3rd P transistor npn npn switch P 3 end again.So, under the situation that a P transistor npn npn switch P 1, the 2nd P transistor npn npn switch P 2 and the 3rd P transistor npn npn switch P 3 are all ended, start unit 210 shut-down operations.Therefore, when start unit 210 shut-down operation behind output enabling signal POR, and can save power consumption after controller starts.Though start unit 210 shut-down operations, since the 8th P transistor npn npn switch P 8 and the 9th P transistor npn npn switch P 9 still conducting and through the 8th resistance R 8 and the 9th resistance R 9 to ground.So unless driving voltage VDD drops to the threshold voltage of the P transistor npn npn of twice, otherwise latch lock unit 220 will continue to export the self-sustaining driving signal START of high level to keep the running of latch lock unit 220.
Latch protection circuit 224 comprises one second reverser INV2, one the 5th N-type transistor switch N5, one the 6th N-type transistor switch N6, a charging capacitor C5, a current source I1 and 1 the tenth resistance R 10, and wherein current source I1 electrically connects operating voltage VCC and the tenth resistance is electrically connected to driving voltage VDD.At the beginning of power-switching circuit starts, be electrically connected to driving voltage VDD by the tenth resistance R 10 and make the R input of RS type door bolt RS receive high level signal and export a high level signal at output Q.And transfer high level to and input to the S input that the RS type is fastened RS with a bolt or latch when self-sustaining drives signal START, it is high level that the output Q output of RS type door bolt RS keeps.When the controller normal operation, a guard signal PROT is low level, the 5th N-type transistor switch N5 conducting after the second reverser INV2 is reverse.At this moment, charging capacitor C5 is in discharge condition, and the 6th N-type transistor switch N6 keeps the output high level signal to the R input of RS type door bolt RS by event, and the output Q of RS type door bolt RS still keeps Last status (being high level) to NAND gate NA.At this moment, the self-sustaining of NAND gate NA reception high level drives the high level output of signal START and RS type door bolt RS and produces a low level latch-up signal LATCH.Therefore, when the controller normal operation, NAND gate NA is a latch-up signal LATCH of output low level, and makes control unit 240 keep normal operation.
When guard signal PROT was the high level of representative circuit abnormality, the 5th N-type transistor switch N5 will be by making charging capacitor C5 begin charged state.If failing to get rid of immediately, circuit abnormality make charging capacitor C5 its cross-pressure after the time postpones rise to the threshold voltage that is higher than the 6th N-type transistor switch N6 and make the 6th N-type transistor switch N6 conducting.At this moment, latch protection circuit 224 output low level signals are to the R input of RS type door bolt RS, and the S input of RS type door bolt RS still continues to receive the self-sustaining driving signal START of high level, and the output Q output of RS type door bolt RS transfers low level to.Because the input signal of NAND gate NA is low level, so transfer a latch-up signal LATCH who exports high level to control unit 240 is decommissioned.At this moment; controller inside only the 8th P transistor npn npn switch P 8, the 9th P transistor npn npn switch P 9, the 8th resistance R 8 and the 9th resistance R 9 formed current paths is also kept outside the power consumption; remaining circuit is closes; so in the time of can guaranteeing that controller enters protected mode at circuit abnormality, the electric power that its required electric power provides less than start-up circuit 205 and guarantee that driving voltage VDD can maintain on the latch circuit 220 minimum operation voltages (present embodiment is the threshold voltage of the P transistor npn npn switch of twice).
Shown in Fig. 5 (b), control unit 240 comprises a voltage stabilizing element 230 and a function element 235.Voltage stabilizing element 230 receives enabling signal POR and latch-up signal LATCH, trigger during for high level at enabling signal POR and to come into operation, when latch-up signal LATCH is low level, convert driving voltage VDD to an operating voltage VCC, and when latch-up signal LATCH is high level, decommission.Function element 235 comprise an over-temperature protection device 236, a processing unit 238, a clock generation device 241, one warm-up time device 243, an error amplification device 244, sweep audio-frequency control device 245, an overcurrent protective device 246, an over-pressure safety device 247, a undercurrent protection device 248 and a under-voltage protection device 249.Control unit 240 receives and comes into operation when enabling signal POR is high level, clock-generating device 241 produces the clock signal OSC of a higher-frequency, make one first control signal S1 and the one second control signal S2 of processing unit 238 output higher-frequency, make one first filament 280a of fluorescent tube 280 and one second filament 280b carry out preheating.Device 243 electrically connected preheating capacitor C t and when controller comes into operation preheating capacitor C t was charged warm-up time.When the current potential of preheating capacitor C t reaches a predetermined pre-thermoelectric potential, device 243 outputs warm-up time one frequency sweep signal PR makes frequency sweep control device 245 begin to export a frequency sweep control signal Fc, make the frequency of the clock signal OSC that clock-generating device 241 produces begin downward frequency sweep lighting fluorescent tube, and after arriving a predetermined registration operation frequency, maintain this predetermined registration operation frequency.
The temperature of over-temperature protection device 236 detecting controllers, the overheat protector signal OTP of output high level when temperature surpasses a preset temperature.Error amplification device 244 received current feedback signal IFB and a current reference signal Vr also export an error amplification signal EA accordingly.Overcurrent protective device 246 received current feedback signal IFB and one cross flow reference signal Vri1, and export an overcurrent protection signal OCP of high level when current feedback signal IFB was higher than flow reference signal Vri1.Undercurrent protection device 248 starts (lighting that process does not have lamp current and the erroneous judgement that causes to avoid fluorescent tube 280) after receiving an enable signal EN; received current feedback signal IFB and a undercurrent reference signal Vri2, and when current feedback signal IFB is lower than undercurrent reference signal Vri2 output high level a undercurrent protection signal UCP.Over-pressure safety device 247 receives voltage feedback signal VFB and and crosses pressure reference signal Vrv1, and exports an overvoltage protection signal OVP of high level when voltage feedback signal VFB was higher than pressure reference signal Vrv1.Under-voltage protection device 249 receives voltage feedback signal VFB and under-voltage reference signal Vrv2, and when voltage feedback signal VFB is lower than under-voltage reference signal Vrv2 one under-voltage protection signal UVP of output high level.
Whether after clock signal OSC dropped to predetermined operation frequencies, fluorescent tube 280 will be lighted under no abnormal situation, and processing unit 238 will produce enable signal EN and enable undercurrent protection device 248 at this moment, light with detecting fluorescent tube 280.To receive under-voltage protection signal UVP, overvoltage protection signal OVP, undercurrent protection signal UCP, overcurrent protection signal OCP and overheat protector signal OTP wherein arbitrary for high level signal when processing unit 238, and processing unit 238 will suspend the output first control signal S1 and the second control signal S2 one is scheduled to reboot time.Driving voltage will drop under the starting resistor value UVLO this moment, and processing unit 238 rises after exporting the first control signal S1 and the second control signal S2 again after this.Processing unit 238 can comprise a counter 231, the number of times of restarting with counting.Counter 231 electrically connects processing unit 238, start unit 210 and latch lock unit 220, and begins the number of times of count enable signal POR after receiving the guard signal of high level.When processing unit 238 restarts power supply unit, for example: still can't get rid of the state of circuit abnormality after three times, counter 231 transmits the guard signal PROT latch circuit 220 of high level.Perhaps; but when start unit 210 receive clock signals with timing; when the guard signal that receives high level does not receive the enabling signal POR of high level after by the predetermined restart ack time yet (this represents change-over circuit 270 has circuit abnormality to cause output voltage V out to rise once again smoothly), also can transmit the guard signal PROT of high level to latch circuit 220.Wherein, the predetermined restart ack time is longer than predetermined reboot time.
In addition, can after the user changes fluorescent tube 280, can reset automatically in order to make power-switching circuit, can increase by a load and restart circuit 290 electric connection fluorescent tubes 280, whether be removed with detecting fluorescent tube 280.Whether shown in Fig. 5 (b), circuit 290 is restarted in load, electrically connects the second filament 280b and the DC input voitage VIN of fluorescent tube 280, exist with detecting fluorescent tube 280, and produce a Restart Signal Sre when fluorescent tube 280 is removed, and control unit 240 is restarted.Control unit also comprises one and restarts unit 295, electrically connects driving voltage VDD, namely electrically connects start-up circuit 205.Restart unit 295 when receiving Restart Signal Sre, discharge the energy storage of electric capacity in the start-up circuit 205, driving voltage VDD is dropped to be lower than latch circuit 220 minimum operation voltages, all circuit in the controller are reset.After fluorescent tube 280 was installed on the power-switching circuit again, load was restarted circuit 290 and is stopped to export Restart Signal Sre.At this moment, restart the energy storage that unit 295 stops to discharge electric capacity in the start-up circuit 205, driving voltage VDD begins to rise.When driving voltage VDD rise to reach the first predeterminated voltage UVLO after, controller restarts.
In the present embodiment, load is restarted circuit 290 and has been comprised one first of series connection and restart resistance R _ f 1, one second and restart resistance R _ f 2 and the 3rd and restart resistance R _ f 3, and the unit 295 of restarting in the controller comprises one the 3rd switch SW 3, is the N-type metal-oxide semiconductor (MOS) at present embodiment.First end of restarting resistance R _ f 1 electrically connects DC input voitage VIN, and the end that the other end and second is restarted resistance R _ f 2 is connected, and by the second filament 280b and second feedback circuit, 260 ground connection.Second other end of restarting resistance R _ f 2 connects the 3rd end of restarting resistance R _ f 3 and restarts the other end ground connection of resistance R _ f 3 in order to produce Restart Signal Sre to the three switch SW 3, the three.When fluorescent tube 280 existed, first restarts tie point that resistance R _ f 1 and second restarts resistance R _ f 2 was limited in by the second filament 280b and second feedback circuit 260 and equals or a little more than the forward bias voltage drop of the diode in second feedback circuit 260.Restart after resistance R _ f 2 and the 3rd restarts resistance R _ f 3 dividing potential drops through second, Restart Signal Sre can't make 3 conductings of the 3rd switch SW at quite low level.And when there be not (being removed) in fluorescent tube 280, DC input voitage VIN is restarted resistance R _ f 1 and second with first and is restarted on the current potential of resistance R _ f 2 tie points and draw, make the level of Restart Signal Sre be higher than the threshold voltage of the 3rd switch SW 3,3 conductings of the 3rd switch SW are pulled down near earthing potential driving voltage VDD, and latch lock unit 220 can't be kept the breech lock function and reach the effect that controller is resetted automatically.
Explanation according to above-described embodiment, power-switching circuit of the present invention and controller thereof are restarted circuit failure back with regard to the breech lock controller when circuit abnormality takes place or through limited number of times, the power consumption when making controller can't provide part or all of function with reduction controller breech lock is to keep driving voltage on the minimum voltage of keeping the breech lock function.So can avoid in the prior art, the useful life of element, reduction and user used the problem of security concerns.And power-switching circuit of the present invention has fluorescent tube and changes and to restart function automatically, damages the circuit abnormality that causes for fluorescent tube, and power-switching circuit can reset automatically after the user changes fluorescent tube, increases the ease of use of power-switching circuit.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
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| TW201238388A (en) | 2011-03-02 | 2012-09-16 | Green Solution Tech Co Ltd | LED driving circuit and short-circuit protection circuit |
| CN102685969B (en) * | 2011-03-15 | 2015-03-11 | 登丰微电子股份有限公司 | LED drive circuit and short circuit protection circuit |
| CN103683924B (en) * | 2012-09-06 | 2016-10-05 | 登丰微电子股份有限公司 | controller with protection |
| CN102891591B (en) * | 2012-10-15 | 2014-10-22 | 杭州士兰微电子股份有限公司 | Power control device and switch power supply containing power control device |
| JP6462404B2 (en) * | 2014-02-28 | 2019-01-30 | 株式会社半導体エネルギー研究所 | DCDC converter, semiconductor device, and electronic apparatus |
| CN104994674B (en) * | 2015-08-03 | 2017-06-06 | 衢州昀睿工业设计有限公司 | A kind of control circuit of plasma striking power supply |
| EP3562022B1 (en) | 2016-12-26 | 2021-11-03 | Hitachi Industrial Equipment Systems Co., Ltd. | Power conversion device and power conversion device system |
| US11621645B2 (en) * | 2020-06-04 | 2023-04-04 | Stmicroelectronics International N.V. | Methods and device to drive a transistor for synchronous rectification |
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| CN1615675A (en) * | 2001-12-28 | 2005-05-11 | 松下电工株式会社 | Ballast for discharge lamp |
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| TWI550984B (en) * | 2013-10-22 | 2016-09-21 | Mitsuru Imai | Power supply |
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