CN104300945A - Primary side feedback control power switch circuit - Google Patents
Primary side feedback control power switch circuit Download PDFInfo
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- CN104300945A CN104300945A CN201410542161.3A CN201410542161A CN104300945A CN 104300945 A CN104300945 A CN 104300945A CN 201410542161 A CN201410542161 A CN 201410542161A CN 104300945 A CN104300945 A CN 104300945A
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Abstract
The invention provides a primary side feedback control power switch circuit. The primary side feedback control power switch circuit comprises a power tube, a driving stage circuit for driving the power tube, and a zero crossing detection circuit for detecting zero crossing of inductive current of the secondary side. The zero crossing detection circuit comprises a resistor and a comparator, wherein the low potential point of the driving stage circuit is grounded through the resistor, the first input end of the comparator is grounded, and the second input end of the comparator is connected with the grid electrode of the power tube. According to the configuration of the comparator, when input signals of the second input end of the comparator are smaller than input signals of the first input end of the comparator, the output end of the comparator outputs a first start signal for controlling the power tube to be switched on. The primary side feedback control power switch circuit comprises the integratable zero crossing detection circuit, so that no peripheral component or chip pin is needed; various protective schemes are provided to guarantee zero crossing detection reliability, so that a peripheral circuit is further omitted, the cost is lowered, and the chip area is reduced.
Description
Technical field
The present invention relates to former limit feedback power pipe ON-OFF control circuit, particularly a kind of former limit feedback power pipe ON-OFF control circuit of integrated zero cross detection circuit.
Background technology
In single switch flyback type switch converters, when working in the application of discontinuous conduct mode or critical conduction mode, often adopt former limit feedback control technology.This former limit feedback power pipe ON-OFF control circuit, its operation principle normally, controls the shutoff of power tube by detecting former limit peak current, control the unlatching of power tube by detecting secondary inductance current over-zero.
As shown in Figure 1, during power tube Q conducting, the electric current of former limit inductance L p constantly increases.Sampled signal Vcs is produced after being sampled by resistance Rcs by the electric current of former limit inductance L p, this sampled signal Vcs is compared by comparator OCP_COMP and reference voltage V REF1, cut-off signals is exported when sampled signal Vcs is greater than reference voltage V REF1, this cut-off signals outputs to driving stage DRIVER by rest-set flip-flop, thus switch-off power pipe Q.This process is the shutoff controlling power tube by detecting former limit peak current.
Power tube Q closes and has no progeny, and the electric current of secondary inductance Ls is reduced to zero gradually.Then, zero passage detection signal V is produced by external auxiliary winding or feedback potential-divider network
fB, by this zero passage detection signal V
fBcompared by comparator ZCD_COMP and reference voltage V REF2, as this zero passage detection signal V
fBexport start signal when being less than reference voltage V REF2, this start signal outputs to driving stage DRIVER by rest-set flip-flop, thus opens power tube Q.This process is the unlatching controlling power tube by detecting secondary inductance current over-zero.
Therefore, the current over-zero how detecting secondary inductance Ls becomes the key technology of this control program.The existing zero passage detection to secondary inductance Ls electric current, by increasing auxiliary winding or realizing by detecting original edge voltage dividing potential drop.These zero passage detection schemes all will increase peripheral components and chip pin usually, and the cost of peripheral components is higher, and the cost of system can be made to increase; Simultaneously these schemes also can increase the area of chip, and this is very large to the impact of the strict application (such as, small size LED illumination equipment) of area requirements for some.
Summary of the invention
For this reason, the invention provides a kind of former limit feedback power pipe ON-OFF control circuit, comprise power tube, drive the zero cross detection circuit of the driving stage circuit of described power tube and detection secondary inductance current over-zero, it is characterized in that, described zero cross detection circuit comprises: resistance, and the electronegative potential point of described driving stage circuit is by described grounding through resistance; Comparator, its first input end ground connection, its second input is connected to the grid of described power tube, and described comparator arrangement is, when the input signal of its second input is less than the input signal of its first input end, its output exports the first start signal controlling described power tube and open.
Further, described control circuit also comprises the clamped protective circuit of power tube driving stage low-voltage, and it comprises diode, and the electronegative potential point of described driving stage circuit is also by described diode ground connection.
Further, described control circuit also comprises the former limit feedback circuit, output low-voltage protection circuit and the decision circuit that export when the electric current detecting former limit inductance is greater than threshold value and control the first cut-off signals that described power tube turns off, wherein, described output low-voltage protection circuit is configured to, when described first cut-off signals starts to export, export the first time delayed signal; Described decision circuit is configured to, and at the end of described first time delayed signal, described decision circuit exports the second start signal controlling described power tube and open.
Further, described control circuit also comprises output overvoltage protection circuit, and it is configured to, when described first cut-off signals starts to export, export the second time delayed signal, and the duration of described second time delayed signal is less than the duration of described first time delayed signal; Described decision circuit is further configured to, and receives described first start signal, and when described first start signal is in the duration interior arrival of described second time delayed signal, described decision circuit exports the second cut-off signals controlling described power tube and turn off.
Further, described decision circuit is further configured to, when described first start signal after described second time delayed signal terminates and described first time delayed signal arrive before terminating, described decision circuit exports the second start signal controlling described power tube and open.
Further, described control circuit also comprises false triggering protective circuit, and it comprises switching tube, and the electronegative potential point of described driving stage circuit is also by described switching tube ground connection, and the control end of described switching tube is connected to described second time delayed signal.
Preferably, described output low-voltage protection circuit comprises the first time delay reverser and first and door, wherein, and the first cut-off signals described in the input termination of described first time delay reverser; Described first connects the output signal of described first time delay reverser and described first cut-off signals respectively with two inputs of door, and it exports described first time delayed signal.
Preferably, described output overvoltage protection circuit comprises the second time delay reverser, the first time delay buffer and second and door, wherein, and the first cut-off signals described in the input termination of described second time delay reverser; The output signal of the second time delay reverser described in the input termination of described first time delay buffer; Described second connects the output signal of described first time delay buffer and described first cut-off signals respectively with two inputs of door, and it exports described second time delayed signal.
Preferably, described decision circuit comprises or door, the first NAND gate and the second time delay buffer, and wherein, two inputs that are described or door connect the second time delayed signal and the first start signal respectively; Two inputs of described first NAND gate connect the first time delayed signal and output signal that is described or door respectively; The output signal of the first NAND gate described in the input termination of described second time delay buffer, it exports described second start signal.
Preferably, described decision circuit also comprise not gate, the 3rd with door and the first rest-set flip-flop, wherein, the first start signal described in the input termination of described not gate; Described 3rd connects the output signal of the second time delayed signal and described not gate respectively with two inputs of door; The R of described first rest-set flip-flop to input described in termination the 3rd with the output signal of door, its S inputs termination reset signal, and its Q output exports described second cut-off signals.
Former limit of the present invention feedback power pipe ON-OFF control circuit, provides the zero cross detection circuit of accessible site, when it is applied to former limit feedback power pipe switch control chip, without the need to any peripheral components and chip pin; Additionally provide the clamped protective circuit of power tube driving stage electronegative potential of same accessible site, export the various protection schemes such as low-voltage protection circuit, output overvoltage protection circuit and false triggering protective circuit; to ensure the reliability of zero passage detection, thus omit peripheral circuit further, reduce costs and reduce chip area.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the former limit feedback power pipe ON-OFF control circuit of prior art;
Fig. 2 is the electrical block diagram of former limit of the present invention feedback power pipe ON-OFF control circuit;
Fig. 3 is the electrical block diagram preferred embodiment of former limit of the present invention feedback power pipe ON-OFF control circuit;
Fig. 4 is the implementation result schematic diagram of former limit of the present invention feedback power pipe ON-OFF control circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, former limit of the present invention feedback power pipe ON-OFF control circuit is described in further detail, but not as a limitation of the invention.
With reference to Fig. 2, former limit of the present invention feedback power pipe ON-OFF control circuit, except comprising the driving stage circuit DRIVER of power tube Q of the prior art and the described power tube of driving, also comprise the zero cross detection circuit being used for detecting secondary inductance current over-zero of accessible site.This zero cross detection circuit comprises resistance Rz and comparator ZCD_COMP.
The electronegative potential point of driving stage circuit DRIVER inside, by this resistance Rz ground connection, namely makes the grid of power tube Q form floating ground structure.The first input end ground connection of this comparator ZCD_COMP, the second input is connected to the grid of power tube Q, with the grid voltage V of detection power pipe Q
g.Comparator ZCD_COMP is configured to when the second input is less than the voltage of first input end, exports the first start signal V controlling power tube Q and open
zCD.
This structure makes when power tube Q conducting, and power tube Q can normal work as power tube of the prior art.After power tube Q closes, its parasitic capacitance C
gDa high pass filter is defined with resistance Rz.Now, due to when the electric current of secondary inductance Ls equals zero, the voltage of former limit inductance L p is by generation medium-frequency oscillator, and the frequency of this medium-frequency oscillator depends on former limit inductance L s, usually at about 1MHz.This medium-frequency oscillator is by the parasitic capacitance C of power tube Q
gDafter the high pass filter that resistance Rz is formed, the grid voltage V of power tube Q will be made
gproduce an intermediate-freuqncy signal around ground level vibration, this signal is the zero passage detection signal that this zero cross detection circuit produces.By the grid voltage V of comparator ZCD_COMP by power tube Q
gcompare with ground level, as grid voltage V
gwhen being less than ground level, export the first start signal V controlling power tube Q and open
zCD.
In the process of zero passage detection; the power tube Q that misleads in order to prevent zero passage detection signal oscillating amplitude too high; former limit of the present invention feedback power pipe ON-OFF control circuit also comprises the clamped protective circuit of power tube driving stage electronegative potential; it comprises diode Dz, and the electronegative potential point of driving stage circuit DRIVER inside is also by this diode Dz ground connection.Because the forward conduction voltage of diode is much smaller than the cut-in voltage of power tube; therefore; in the down periods of power tube Q, the structure of the clamped protective circuit of this power tube driving stage low-voltage can make the ceiling voltage of the grid of power tube Q equal the forward conduction voltage of diode Dz.
When system just starts, the output voltage of transformer secondary is very low, so time very little to the voltage amplitude on former limit from secondary flyback, make the amplitude of zero passage detection signal also minimum, now may exist zero passage detection lost efficacy risk.In addition, when output short-circuit, output voltage is also extremely low, also there will be the risk that zero passage detection same when just starting with system lost efficacy.
For this reason, former limit of the present invention feedback power pipe ON-OFF control circuit, also comprise and export low-voltage protection circuit 100 and decision circuit 300, it starts working after former limit feedback circuit exports the first cut-off signals Voc.Former limit feedback circuit herein with of the prior art same or similar, when the electric current for detecting former limit inductance L p is greater than certain value, can export the first cut-off signals Voc controlling power tube Q and turn off.
Export low-voltage protection circuit 100 to be configured to, when the first cut-off signals Voc starts to export, export low-voltage protection circuit 100 and export the first time delayed signal V
tDH.Decision circuit 300 is configured to, at the first time delayed signal V
tDHat the end of, decision circuit 300 exports the second start signal V controlling power tube Q and open
zCDT.Usually, the first time delayed signal V
tDHrequirement has a longer duration, and the duration T DH of this signal is the higher limit of erasing time, and it determines the lower threshold value of output voltage: TDH=N*Ls*Ip/VOUT (MIN).
Namely; by exporting low-voltage protection circuit 100 and decision circuit 300, make former limit of the present invention feedback power pipe ON-OFF control circuit, lower or extremely low and when zero passage detection may be caused to lose efficacy at output end voltage; after the time delay TDH time, force output second start signal V
zCDTopen power tube Q, efficiently avoid the situation causing opening power tube Q because flyback voltage is too small.
As shown in Figure 3, preferably, export low-voltage protection circuit 100 and comprise the first time delay reverser and first and door, wherein, the input termination first cut-off signals Voc of the first time delay reverser; First meets output signal and the first cut-off signals Voc of the first time delay reverser respectively with two inputs of door, and it exports the first time delayed signal V
tDH.Decision circuit 300 comprises or door, the first NAND gate and the second time delay buffer, and wherein, or two of door inputs meet the second time delayed signal V respectively
tDLwith the first start signal V
zCD; Two inputs of the first NAND gate meet the first time delayed signal V respectively
tDHwith or the output signal of door; The output signal of input termination first NAND gate of the second time delay buffer, it exports the second start signal V
zCDT.
In addition, former limit of the present invention feedback power pipe ON-OFF control circuit also has over-voltage protecting function, is realized by overvoltage crowbar 200 and decision circuit 300.Particularly, as shown in Figure 2, output overvoltage protection circuit 200 is configured to, and when the first cut-off signals Voc starts to export, exports the second time delayed signal V
tDL, this second time delayed signal V
tDLduration T DL be less than the first time delayed signal V
tDHduration T DH.TDL is the lower limit of erasing time, and it determines the upper threshold value of output voltage: TDL=N*Ls*Ip/VOUT (MAX).
First start signal V
zCDbe input to decision circuit 300, this decision circuit 300 is further configured to, as the first start signal V
zCDat the second time delayed signal V
tDLduration TDL in arrive, decision circuit 300 exports the second cut-off signals Vovp controlling power tube Q and turn off.
The principle that overvoltage crowbar 200 and decision circuit 300 realize overvoltage protection is, when output overvoltage, along with increasing of output voltage, the time (erasing time TDEM) that the electric current of secondary inductance drops to zero can shorten, V
zCDduration also can shorten.As TDEM<TDL, decision circuit 300 output over-voltage protection signal Vovp, Vovp can close power tube Q by controlling driving stage circuit DRIVER, thus the over-voltage protecting function of switch-off power pipe Q when realizing output overvoltage.As shown in Figure 3, output overvoltage protection circuit 200 comprises the second time delay reverser, the first time delay buffer and second and door, wherein, and the input termination first cut-off signals Voc of the second time delay reverser; The output signal of the input termination second time delay reverser of the first time delay buffer; Second meets output signal and the first cut-off signals Voc of the first time delay buffer respectively with two inputs of door, and it exports the second time delayed signal V
tDL.Decision circuit 300 comprise not gate, the 3rd with door and the first rest-set flip-flop, wherein, the input termination first start signal V of not gate
zCD; 3rd meets the second time delayed signal V respectively with two inputs of door
tDLwith the output signal of not gate; The R of the first rest-set flip-flop inputs the output signal of termination the 3rd and door, and its S inputs the power-on reset signal of termination chip internal, and its Q output exports the second cut-off signals Vovp.
Moment after power tube Q closes, the electric current of secondary inductance Ls does not also drop to zero, and the voltage of former limit inductance L p is by the convergent oscillation of a generation high frequency, and the frequency of this vibration depends on the leakage inductance of former limit inductance L p, usually at about 5MHz.The easy false triggering zero cross detection circuit of this higher-order of oscillation also opens power tube.In order to avoid the false triggering in this case caused; former limit of the present invention feedback power pipe ON-OFF control circuit also comprises false triggering protective circuit; it comprises switching tube Mz; the electronegative potential point of driving stage circuit DRIVER inside also passes through this switching tube Mz ground connection, the second time delayed signal V of control termination output overvoltage protection circuit 200 output of this switching tube Mz
tDL.
As shown in Figures 2 and 3, switching tube is preferably NMOS tube, and its grid takes over the second time delayed signal V that voltage protection circuit 200 exports
tDL.Thus power tube Q close after the TDL time in, the second time delayed signal V
tDLmaintain switching tube Mz conducting always, thus by the grounded-grid of power tube Q to avoid producing the zero passage detection signal easily causing false triggering, also avoid simultaneously and open power tube Q by mistake and affect efficiency.
Meanwhile, if the first start signal V
zCDat the second time delayed signal V
tDLafter end and the first time delayed signal V
tDHarrive before end, then decision circuit 300 exports the second start signal V controlling power tube Q and open
zCDT.
So, former limit of the present invention feedback power pipe ON-OFF control circuit can realize following function: with reference to Fig. 4, if the first start signal V
zCDat the second time delayed signal V
tDLarrive before end, then think output overvoltage, judging module 300 does not export final start signal (that is, the second start signal V opening power tube Q
zCDT).If the first start signal V
zCDat the second time delayed signal V
tDLafter end and the first time delayed signal V
tDHarrive before end, then judging module 300 normally exports the second start signal V
zCDT.If the first time delayed signal V
tDHafter end, the first start signal V
zCDalso do not arrive, then think that the situation that output short-circuit or output voltage are extremely low, judging module 300 force output second start signal V
zCDT.
As shown in Figure 3, former limit of the present invention feedback power pipe ON-OFF control circuit also comprises the second rest-set flip-flop and for driving the driving stage circuit DRIVER of described power tube.The R of the second rest-set flip-flop inputs termination first cut-off signals Voc, and its S inputs termination second start signal V
zCDT.Driving stage circuit DRIVER comprises the second NAND gate, NMOS tube, PMOS and accessory power supply, wherein, two inputs of the second NAND gate meet output signal and the second cut-off signals Vovp of the Q output of the second rest-set flip-flop respectively, making when receiving the second cut-off signals Vovp, closing power tube Q.Be connected between accessory power supply VCC and resistance Rz after PMOS and NMOS tube are connected in series, driving power pipe Q, wherein PMOS meets accessory power supply VCC, can open power tube Q, and NMOS tube connecting resistance Rz, can close power tube Q.
In the above-described embodiment, by conditional floating to the ground level of driving stage circuit, the parasitic capacitance C of power tube Q is formed
gDgather zero cross signal with the high pass filter of resistance Rz, by the time delay reverser in regulation output low-voltage protection circuit 100, regulate the first time delayed signal V
tDHduration T DH; By time delay reverser and the time delay buffer of regulation output overvoltage crowbar 200, regulate the duration T DL of the second time delayed signal; By decision circuit 300, ensure TDL≤TDEM≤TDH, finally achieve the general protection to zero cross detection circuit.
Former limit of the present invention feedback power pipe ON-OFF control circuit, the generation of its zero passage detection signal can be integrated in chip internal, and result simple and stable, detection means and the absorbing circuit of chip periphery can be omitted, and then achieve miniaturization and integrated of such application.Simultaneously; by to the restriction of erasing time TDEM and monitoring; system soft start, anti-error triggering, anti-output short-circuit, anti-output overvoltage four kinds of functions can be realized simultaneously; for this zero passage detection mode provides comprehensive protection; ensure that the high reliability of this scheme; and the circuit implemented is simple, multiple circuit can practical function multiplexing, save area and the cost of chip.
Above embodiment is only illustrative embodiments of the present invention, can not be used for limiting the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can in essence of the present invention and protection range, and make various amendment or equivalent replacement to the present invention, these are revised or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (10)
1. a former limit feedback power pipe ON-OFF control circuit, comprise power tube, drive the zero cross detection circuit of the driving stage circuit of described power tube and detection secondary inductance current over-zero, it is characterized in that, described zero cross detection circuit comprises:
Resistance, the electronegative potential point of described driving stage circuit is by described grounding through resistance;
Comparator, its first input end ground connection, its second input is connected to the grid of described power tube, and described comparator arrangement is, when the input signal of its second input is less than the input signal of its first input end, its output exports the first start signal controlling described power tube and open.
2. former limit according to claim 1 feedback power pipe ON-OFF control circuit; it is characterized in that; described control circuit also comprises the clamped protective circuit of power tube driving stage low-voltage, and it comprises diode, and the electronegative potential point of described driving stage circuit is also by described diode ground connection.
3. former limit according to claim 1 feedback power pipe ON-OFF control circuit; it is characterized in that; described control circuit also comprises the former limit feedback circuit, output low-voltage protection circuit and the decision circuit that export when the electric current detecting former limit inductance is greater than threshold value and control the first cut-off signals that described power tube turns off; wherein
Described output low-voltage protection circuit is configured to, and when described first cut-off signals starts to export, exports the first time delayed signal;
Described decision circuit is configured to, and at the end of described first time delayed signal, described decision circuit exports the second start signal controlling described power tube and open.
4. former limit according to claim 3 feedback power pipe ON-OFF control circuit, it is characterized in that, described control circuit also comprises output overvoltage protection circuit, it is configured to when described first cut-off signals starts to export, export the second time delayed signal, the duration of described second time delayed signal is less than the duration of described first time delayed signal;
Described decision circuit is further configured to, and receives described first start signal, and when described first start signal is in the duration interior arrival of described second time delayed signal, described decision circuit exports the second cut-off signals controlling described power tube and turn off.
5. former limit according to claim 4 feedback power pipe ON-OFF control circuit, it is characterized in that, described decision circuit is further configured to, when described first start signal after described second time delayed signal terminates and described first time delayed signal arrive before terminating, described decision circuit exports the second start signal controlling described power tube and open.
6. former limit according to claim 4 feedback power pipe ON-OFF control circuit; it is characterized in that; described control circuit also comprises false triggering protective circuit; it comprises switching tube; the electronegative potential point of described driving stage circuit also passes through described switching tube ground connection, the second time delayed signal described in the control termination of described switching tube.
7. former limit according to claim 3 feedback power pipe ON-OFF control circuit, is characterized in that, described output low-voltage protection circuit comprises the first time delay reverser and first and door, wherein,
First cut-off signals described in the input termination of described first time delay reverser;
Described first connects the output signal of described first time delay reverser and described first cut-off signals respectively with two inputs of door, and it exports described first time delayed signal.
8. former limit according to claim 4 feedback power pipe ON-OFF control circuit, is characterized in that, described output overvoltage protection circuit comprises the second time delay reverser, the first time delay buffer and second and door, wherein,
First cut-off signals described in the input termination of described second time delay reverser;
The output signal of the second time delay reverser described in the input termination of described first time delay buffer;
Described second connects the output signal of described first time delay buffer and described first cut-off signals respectively with two inputs of door, and it exports described second time delayed signal.
9. former limit according to claim 4 feedback power pipe ON-OFF control circuit, is characterized in that, described decision circuit comprises or door, the first NAND gate and the second time delay buffer, wherein,
Two inputs that are described or door connect the second time delayed signal and the first start signal respectively;
Two inputs of described first NAND gate connect the first time delayed signal and output signal that is described or door respectively;
The output signal of the first NAND gate described in the input termination of described second time delay buffer, it exports described second start signal.
10. former limit according to claim 9 feedback power pipe ON-OFF control circuit, is characterized in that, described decision circuit also comprise not gate, the 3rd with door and the first rest-set flip-flop, wherein,
First start signal described in the input termination of described not gate;
Described 3rd connects the output signal of the second time delayed signal and described not gate respectively with two inputs of door;
The R of described first rest-set flip-flop to input described in termination the 3rd with the output signal of door, its S inputs termination reset signal, and its Q output exports described second cut-off signals.
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| CN104578722A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Zero cross detection circuit of inductive current in power switch chip |
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| 王松林;郭王瑞;陈雷;王辉;: "导通时间渐增的软启动电路" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578722A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Zero cross detection circuit of inductive current in power switch chip |
| CN104578722B (en) * | 2014-12-30 | 2019-09-13 | 上海贝岭股份有限公司 | The zero cross detection circuit of inductive current in a kind of power switch chip |
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