CN103595390A - Circuit and method for controlling latch mode of pulse width modulation circuit - Google Patents
Circuit and method for controlling latch mode of pulse width modulation circuit Download PDFInfo
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- CN103595390A CN103595390A CN201210289545.XA CN201210289545A CN103595390A CN 103595390 A CN103595390 A CN 103595390A CN 201210289545 A CN201210289545 A CN 201210289545A CN 103595390 A CN103595390 A CN 103595390A
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Abstract
The invention discloses a circuit and a method for controlling a latch mode of a pulse width modulation circuit. The circuit comprises a D-type flip-flop, a voltage generation unit, a comparator and a logic unit. The D-type flip-flop generates on-off control signals according to latch enabling signals. When the voltage generation unit starts according to the on-off control signals, the voltage generation unit generates discharge current and first voltage. When the discharge current is equal to charging current, voltage of a preset pin of the pulse width modulation circuit is equal to preset voltage. The comparator compares reference voltage with the first voltage so as to generate a comparison signal. The logic unit generates a clear signal according to the comparison signal. The D-type flip-flop eliminates the on-off control signal according to the clear signal. Therefore, the circuit and the method can provide accurate latch removing voltage which is not easy to influence by external influences, and users can control the time during which voltage of the preset pin drops to the latch removing voltage from the preset voltage.
Description
Technical field
The invention relates to a kind of circuit and method thereof of control impuls width modulation circuit breech lock pattern, espespecially accurately and be not subject to a solution breech lock voltage for pulse width modulation circuit external action, also can allow user calculate circuit and the method thereof of the control impuls width modulation circuit breech lock pattern of the time of separating breech lock voltage.
Background technology
Pulse width modulation circuit is to utilize breech lock pattern to protect to avoid the AC/DC converting circuit of apply pulse width modulation circuit to burn under unusual condition, and wherein the protection of breech lock pattern is to be overvoltage protection (over voltage protection), overcurrent protection (over current protection), overload protection (over load protection) or over-temperature protection (over temperature protection) etc.In addition, prior art is to utilize the AC-input voltage close AC/DC converting circuit to make the voltage drop of predetermined pin of pulse width modulation circuit to specific level, to remove the breech lock pattern protection of pulse width modulation circuit.
In the prior art, the voltage stabilizing didoe that is coupled to the predetermined pin of pulse width modulation circuit is the voltage quasi position that is set in the predetermined pin of removing the pulse width modulation circuit after the protection of breech lock pattern.Yet prior art has following shortcoming: the first, voltage stabilizing didoe can increase the chip size of pulse width modulation circuit; The second, the voltage quasi position of the predetermined pin of the pulse width modulation circuit after the protection of releasing breech lock pattern is easily subject to the ambient temperature effect outside pulse width modulation circuit; Three, have ± 5% error of general voltage stabilizing didoe.
Summary of the invention
One embodiment of the invention provide a kind of circuit of control impuls width modulation circuit breech lock pattern.This circuit comprises D type flip-flop, voltage generation unit, comparator and logical block.This D type flip-flop is in order to according to breech lock enable signal, produces switch controlling signal; This voltage generation unit comprises a component piezoresistance, wherein when this voltage generation unit is opened according to this switch controlling signal, this voltage generation unit produces discharging current, and the charging current that produces according to the primary side of AC/DC converting circuit of this discharging current and this pulse width modulation circuit of application of this component piezoresistance, produce the first voltage, wherein, when this discharging current equals this charging current, the voltage of the predetermined pin of this pulse width modulation circuit is to equal predetermined voltage; This comparator is in order to comparison reference voltage and this first voltage, to produce comparison signal; This logical block is in order to according to this comparison signal, produces clear signal; This D type flip-flop is according to this clear signal, removes this switch controlling signal.
An also embodiment of the present invention provides a kind of method of control impuls width modulation circuit breech lock pattern, the circuit of controlling this pulse width modulation circuit breech lock pattern comprises D type flip-flop, voltage generation unit, comparator and logical block, and wherein this voltage generation unit comprises a component piezoresistance.The method comprises that this D type flip-flop is according to breech lock enable signal, produces switch controlling signal; When this voltage generation unit is opened according to this switch controlling signal, this voltage generation unit produces discharging current, and the charging current that produces according to the primary side of AC/DC converting circuit of this discharging current and this pulse width modulation circuit of application of this component piezoresistance, produce the first voltage, wherein, when this discharging current equals this charging current, the voltage of the predetermined pin of this pulse width modulation circuit is to equal predetermined voltage; This comparator comparison reference voltage and this first voltage, to produce comparison signal; This logical block, according to this comparison signal, produces clear signal; This D type flip-flop, according to this clear signal, is removed this switch controlling signal.
The invention provides a kind of circuit and method thereof of control impuls width modulation circuit breech lock pattern.This circuit and the method are to utilize D type flip-flop according to breech lock enable signal, produce switch controlling signal, then discharging current is opened and produced to voltage generation unit according to this switch controlling signal, wherein, when this discharging current equals charging current that the primary side of AC/DC converting circuit produces, the voltage of the predetermined pin of this pulse width modulation circuit is to equal predetermined voltage.Therefore, user can adjust this predetermined voltage by controlling this charging current, and user also can be down to the time of separating breech lock voltage from this predetermined voltage by being coupled to the voltage that the electric capacity of this predetermined pin learn this predetermined pin.So, compared to prior art, the present invention not only can provide accurately and not be subject to this solution breech lock voltage of this pulse width modulation circuit external action, also can allow user by adjustment, be coupled to the electric capacity of this predetermined pin, to control the voltage of this predetermined pin, from this predetermined voltage, be down to the time of this solution breech lock voltage.
Accompanying drawing explanation
Fig. 1 illustrates a kind of schematic diagram of circuit of control impuls width modulation circuit breech lock pattern for one embodiment of the invention.
Fig. 2 illustrates a kind of schematic diagram of circuit of control impuls width modulation circuit breech lock pattern for an also embodiment of the present invention.
Fig. 3 illustrates a kind of schematic diagram of circuit of control impuls width modulation circuit breech lock pattern for an also embodiment of the present invention.
Fig. 4 illustrates a kind of schematic diagram of circuit of control impuls width modulation circuit breech lock pattern for an also embodiment of the present invention.
Fig. 5 is for the schematic diagram of variation of the voltage of predetermined pin is described.
Fig. 6 illustrates a kind of flow chart of method of control impuls width modulation circuit breech lock pattern for an also embodiment of the present invention.
Wherein, description of reference numerals is as follows:
100 circuit
102 D type flip-flops
104 voltage generation units
106 comparators
108 logical blocks
110 auxiliary windings
112 switches
114 electric capacity
200 pulse width modulation circuit
202 predetermined pins
1042,1044 divider resistances
1046 current sources
CS clear signal
COS comparison signal
D, CK, CL input
ICC discharging current
IDC charging current
LAT breech lock enable signal
Q output
RC charging resistor
SCS switch controlling signal
The T time
VH high voltage
VI induced voltage
VAC alternating voltage
VCC voltage
V1 the first voltage
VP predetermined voltage
VP1 the first predetermined voltage
VDC direct voltage
VREF reference voltage
400-410 step
Embodiment
Please refer to Fig. 1, Fig. 1 illustrates a kind of schematic diagram of circuit 100 of control impuls width modulation circuit breech lock pattern for one embodiment of the invention.Circuit 100 comprises D type flip-flop 102, voltage generation unit 104, comparator 106 and logical block 108.D type flip-flop 102 is in order to according to breech lock enable signal LAT, produce switch controlling signal SCS, wherein the input D of D type flip-flop 102 receives high voltage VH, input CK receives breech lock enable signal LAT, input CL receives clear signal CS, and output Q is in order to output switch control signal SCS, voltage generation unit 104 comprises a component piezoresistance 1042, 1044, wherein when the included current source 1046 of voltage generation unit 104 is opened according to switch controlling signal SCS, current source 1046 is according to the voltage VCC of the predetermined pin 202 of pulse width modulation circuit 200, produce discharging current ICC (that is discharging current ICC can change with the voltage VCC of predetermined pin 202), and divider resistance 1042, the 1044 charging current IDC that produce according to the primary side of the AC/DC converting circuit of discharging current ICC and apply pulse width modulation circuit 200, produce the first voltage V1, wherein when discharging current ICC equals charging current IDC, the voltage VCC of predetermined pin 202 equals predetermined voltage VP.In addition, as shown in Figure 1, charging current IDC is determined by the direct voltage VDC of the primary side of AC/DC converting circuit and charging resistor RC.In addition, in an also embodiment of the present invention, charging current IDC is determined (as shown in Figure 2) by the alternating voltage VAC of the primary side of AC/DC converting circuit and charging resistor RC.Logical block 108 is in order to according to comparison signal COS, produces clear signal CS; D type flip-flop 102 is according to clear signal CS, clear switch control signal SCS.As shown in Figure 1, comparator 106 is in order to comparison reference voltage VREF and the first voltage V1, and to produce comparison signal COS, wherein, when reference voltage VREF is greater than the first voltage V1, comparator 106 produces comparison signal COS, and logical block 108 is to be inverter.Please refer to Fig. 3, in an also embodiment of the present invention, comparator 106 is reference voltage VREF while being less than the first voltage V1, produces comparison signal COS, and logical block 108 be for logical block be the inverter for two series connection.In addition, please refer to Fig. 4, in an also embodiment of the present invention, comparator 106 is that reference voltage VREF is while being less than the first voltage V1, produce comparison signal COS, and charging current IDC is that alternating voltage VAC and charging resistor RC by the primary side of AC/DC converting circuit determined.
Please refer to Fig. 5, Fig. 5 is for the schematic diagram of variation of the voltage VCC of predetermined pin 202 is described.As shown in Figure 5, when AC/DC converting circuit receives and when rectified AC voltage VAC becomes direct voltage VDC, induced voltage VI on the auxiliary winding 110 of the primary side of AC/DC converting circuit rises gradually, so the voltage VCC of predetermined pin 202 starts to increase gradually from 0V.Now, current source 1046 is not yet opened, for example, for example, and the discharging current ICC of the predetermined pin 202 of flowing through (leakage current of 15uA) is less than charging current IDC (220uA), so the voltage VCC of predetermined pin 202 for example can continue to increase, to the first predetermined voltage VP1 (15V).When the voltage VCC of predetermined pin 202 equals the first predetermined voltage VP1, pulse width modulation circuit 200 starts to produce pulse width modulation signal, and the switch 112 of the primary side of AC/DC converting circuit starts according to pulse width modulation unblanking and cuts out.When switch 112 starts according to pulse width modulation unblanking and cuts out (now current source 1046 is still closed), the discharging current ICC of the predetermined pin 202 of flowing through (for example 2mA) is other circuit being supplied in pulse width modulation circuit 200.
As shown in Figure 1 and Figure 5, when pulse width modulation circuit 200 is because overvoltage protection (over voltage protection), overcurrent protection (over current protection), overload protection (over load protection) or over-temperature protection (over temperature protection) etc., while producing breech lock enable signal LAT, D type flip-flop 102 is according to breech lock enable signal LAT, produce switch controlling signal SCS to current source 1046, and pulse width modulation circuit 200 stops sending pulse width modulation signal to switch 112 according to breech lock enable signal LAT.Now, because current source 1046 is according to switch controlling signal SCS unlatching, so the first voltage V1 is the dividing potential drop for the voltage VCC of predetermined pin 202.Because pulse width modulation circuit 200 stops sending pulse width modulation signal to switch 112, so the voltage VCC of predetermined pin 202 starts to decline and the discharging current ICC of the predetermined pin 202 of flowing through also starts to decline.
As shown in Figure 5, when the voltage VCC of predetermined pin 202 continues to drop to predetermined voltage VP, the discharging current ICC of the predetermined pin 202 of flowing through equals charging current IDC.So, the voltage VCC of predetermined pin 202 will be maintained at predetermined voltage VP.That is user can adjust predetermined voltage VP by controlling charging current IDC.Yet when alternating voltage VAC is removed, charging current IDC is down to zero.Now, the voltage VCC of predetermined pin 202 will start reduction until separate breech lock voltage VDL according to the discharging current ICC of the predetermined pin 202 of flowing through, and the time T that wherein the voltage VCC of predetermined pin 202 is down to solution breech lock voltage VDL from predetermined voltage VP can determine according to formula (1):
T=(VP-VDL)/C (1)
Shown in (1), C is for being coupled to the capacitance of the electric capacity 114 of predetermined pin 202.Therefore, user can know how long remove alternating voltage VAC can connect alternating voltage VAC afterwards again.
As shown in Figure 1 and Figure 5, when the voltage VCC of predetermined pin 202 is when separating breech lock voltage VDL, because reference voltage VREF is greater than the first voltage V1, so comparator 106 produces comparison signal COS, cause logical block 108 according to comparison signal COS, produce clear signal CS.Therefore, D type flip-flop 102 can be according to clear signal CS, and clear switch control signal SCS, causes voltage generation unit 104 to be closed and the first voltage V1 is increased to high potential once again.In addition, in also ㄧ embodiment of the present invention, when voltage generation unit 104 is opened according to switch controlling signal SCS, voltage generation unit 104 is to utilize constant current source to produce discharging current ICC, and its operating principle can, with reference to Fig. 1 and Fig. 5, not repeat them here.
Please refer to Fig. 6, Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, Fig. 6 illustrates a kind of flow chart of method of control impuls width modulation circuit breech lock pattern for an also embodiment of the present invention.The method of Fig. 6 is to utilize circuit 100 explanations of Fig. 1, and detailed step is as follows:
Step 400: start;
Step 402:D type flip-flop 102, according to breech lock enable signal LAT, produces switch controlling signal SCS;
Step 404: when voltage generation unit 104 is opened according to switch controlling signal SCS, voltage generation unit 104 produces discharging current ICC, and the charging current IDC that produces according to the primary side of discharging current ICC and AC/DC converting circuit of divider resistance 1042,1044, produce the first voltage V1;
Step 406: comparator 106 comparison reference voltage VREF and the first voltage V1, to produce comparison signal COS;
Step 408: logical block 108, according to comparison signal COS, produces clear signal CS;
Step 410:D type flip-flop 102 is according to clear signal CS, clear switch control signal SCS; Rebound step 402.
In step 402, pulse width modulation circuit 200 can be because of overvoltage protection, overcurrent protection, overload protection or over-temperature protection etc., and produces breech lock enable signal LAT to D type flip-flop 102.Therefore, D type flip-flop 102, according to breech lock enable signal LAT, produces switch controlling signal SCS to voltage generation unit 104.In step 404, the included current source 1046 of voltage generation unit 104 is according to the voltage VCC of the predetermined pin 202 of pulse width modulation circuit 200, produce discharging current ICC (that is discharging current ICC can change with the voltage VCC of predetermined pin 202), and divider resistance 1042, 1044 according to discharging current ICC and charging current IDC, produce the first voltage V1 to comparator 106, wherein charging current IDC is determined by direct voltage VDC and charging resistor RC, voltage VCC relates to the voltage VI that auxiliary winding 110 produces, and the first voltage V1 is the dividing potential drop for the voltage VCC of predetermined pin 202.As shown in Figure 5, when the voltage VCC of predetermined pin 202 continues to drop to predetermined voltage VP, the discharging current ICC of the predetermined pin 202 of flowing through equals charging current IDC.So, the voltage VCC of predetermined pin 202 will be maintained at predetermined voltage VP.In step 406, when reference voltage VREF is less than the first voltage V1, comparator 106 can not produce comparison signal COS.Yet, as shown in Figure 5, when alternating voltage VAC is removed, charging current IDC is down to zero, cause the first voltage V1 along with the voltage VCC of predetermined pin 202 reduces and during lower than reference voltage VREF (that is voltage VCC is lower than separating breech lock voltage VDL), comparator 106 just can produce comparison signal COS.But in also ㄧ embodiment of the present invention (as shown in Figure 3 and Figure 4), comparator 106 is reference voltage VREF while being less than the first voltage V1, produces comparison signal COS.In step 408, logical block 108 (inverter) can, according to comparison signal COS, produce clear signal CS.In step 410, D type flip-flop 102 is according to clear signal CS, and clear switch control signal SCS, causes voltage generation unit 104 to be closed and the first voltage V1 is increased to high potential once again.So, D type flip-flop 102 can be waited for the breech lock enable signal LAT that pulse width modulation circuit 200 produces because of overvoltage protection, overcurrent protection, overload protection or over-temperature protection etc. again.
In sum, circuit and the method thereof of control impuls width modulation circuit breech lock pattern provided by the present invention, to utilize D type flip-flop according to breech lock enable signal, produce switch controlling signal, then voltage generation unit opens and produces discharging current according to switch controlling signal, wherein, when discharging current equals charging current that the primary side of AC/DC converting circuit produces, the voltage of the predetermined pin of pulse width modulation circuit is to equal predetermined voltage.Therefore, user can adjust predetermined voltage by controlling charging current, and user also can learn by being coupled to the electric capacity of predetermined pin that the voltage of predetermined pin is down to the time of separating breech lock voltage from predetermined voltage.So, compared to prior art, the present invention not only can provide accurately and not be subject to the solution breech lock voltage of pulse width modulation circuit external action, also can allow user by adjustment, be coupled to the electric capacity of predetermined pin, to control the voltage of predetermined pin, from predetermined voltage, is down to the time of separating breech lock voltage.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (20)
1. a circuit for control impuls width modulation circuit breech lock pattern, this circuit is characterised in that and comprises:
D type flip-flop, in order to according to breech lock enable signal, produces switch controlling signal;
Voltage generation unit, comprise a component piezoresistance, wherein when this voltage generation unit is opened according to this switch controlling signal, this voltage generation unit produces discharging current, and the charging current that produces according to the primary side of AC/DC converting circuit of this discharging current and this pulse width modulation circuit of application of this component piezoresistance, produce the first voltage, wherein, when this discharging current equals this charging current, the voltage of the predetermined pin of this pulse width modulation circuit is to equal predetermined voltage;
Comparator, in order to comparison reference voltage and this first voltage, to produce comparison signal; And
Logical block, in order to according to this comparison signal, produces clear signal;
Wherein this D type flip-flop is according to this clear signal, removes this switch controlling signal.
2. circuit as claimed in claim 1, is characterized in that, when this reference voltage is greater than this first voltage, this comparator produces this comparison signal.
3. circuit as claimed in claim 2, is characterized in that, this logical block is to be inverter.
4. circuit as claimed in claim 1, is characterized in that, when this reference voltage is less than this first voltage, this comparator produces this comparison signal.
5. circuit as claimed in claim 4, is characterized in that, this logical block is the inverter for two series connection.
6. circuit as claimed in claim 1, is characterized in that, this first voltage is the dividing potential drop for the voltage of this predetermined pin.
7. circuit as claimed in claim 1, is characterized in that, this charging current is determined by the direct voltage of this primary side and charging resistor.
8. circuit as claimed in claim 1, is characterized in that, the voltage of this predetermined pin relates to the voltage that the auxiliary winding of this primary side produces.
9. circuit as claimed in claim 1, is characterized in that, this voltage generation unit is the voltage according to this predetermined pin, produces this discharging current.
10. circuit as claimed in claim 1, is characterized in that, this voltage generation unit is to utilize constant current source to produce this discharging current.
The method of 11. 1 kinds of control impuls width modulation circuit breech lock patterns, the circuit of controlling this pulse width modulation circuit breech lock pattern comprises D type flip-flop, voltage generation unit, comparator and logical block,
Wherein this voltage generation unit comprises a component piezoresistance, the method is characterized in that and comprises:
This D type flip-flop, according to breech lock enable signal, produces switch controlling signal;
When this voltage generation unit is opened according to this switch controlling signal, this voltage generation unit produces discharging current, and the charging current that produces according to the primary side of AC/DC converting circuit of this discharging current and this pulse width modulation circuit of application of this component piezoresistance, produce the first voltage, wherein, when this discharging current equals this charging current, the voltage of the predetermined pin of this pulse width modulation circuit is to equal predetermined voltage;
This comparator comparison reference voltage and this first voltage, to produce comparison signal; And
This logical block, according to this comparison signal, produces clear signal;
This D type flip-flop, according to this clear signal, is removed this switch controlling signal.
12. methods as claimed in claim 11, is characterized in that, when this reference voltage is greater than this first voltage, this comparator produces this comparison signal.
13. methods as claimed in claim 12, is characterized in that, this logical block is to be inverter.
14. methods as claimed in claim 11, is characterized in that, when this reference voltage is less than this first voltage, this comparator produces this comparison signal.
15. methods as claimed in claim 14, is characterized in that, this logical block is the inverter for two series connection.
16. methods as claimed in claim 11, is characterized in that, this first voltage is the dividing potential drop for the voltage of this predetermined pin.
17. methods as claimed in claim 11, is characterized in that, this charging current is determined by the direct voltage of this primary side and charging resistor.
18. methods as claimed in claim 11, is characterized in that, the voltage of this predetermined pin relates to the voltage that the auxiliary winding of this primary side produces.
19. methods as claimed in claim 11, is characterized in that, this voltage generation unit is the voltage according to this predetermined pin, produces this discharging current.
20. methods as claimed in claim 11, is characterized in that, this voltage generation unit is to utilize constant current source to produce this discharging current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210289545.XA CN103595390B (en) | 2012-08-14 | 2012-08-14 | Circuit and method for controlling latch mode of pulse width modulation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210289545.XA CN103595390B (en) | 2012-08-14 | 2012-08-14 | Circuit and method for controlling latch mode of pulse width modulation circuit |
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| CN103595390B CN103595390B (en) | 2017-05-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979264A (en) * | 2016-10-21 | 2018-05-01 | 通嘉科技股份有限公司 | Line voltage detection circuit and relevant detection method |
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| CN101394132A (en) * | 2007-09-19 | 2009-03-25 | 通嘉科技股份有限公司 | Pulse width modulating control circuit applied to capacitor charging |
| TWI333725B (en) * | 2007-07-18 | 2010-11-21 | Leadtrend Tech Corp | Power converting system and over-loading protection device thereof |
| US20110261596A1 (en) * | 2010-04-27 | 2011-10-27 | Bcd Semiconductor Manufacturing Limited | Control circuit for primary side control of switching power supply |
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2012
- 2012-08-14 CN CN201210289545.XA patent/CN103595390B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI333725B (en) * | 2007-07-18 | 2010-11-21 | Leadtrend Tech Corp | Power converting system and over-loading protection device thereof |
| CN101394132A (en) * | 2007-09-19 | 2009-03-25 | 通嘉科技股份有限公司 | Pulse width modulating control circuit applied to capacitor charging |
| US20110261596A1 (en) * | 2010-04-27 | 2011-10-27 | Bcd Semiconductor Manufacturing Limited | Control circuit for primary side control of switching power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107979264A (en) * | 2016-10-21 | 2018-05-01 | 通嘉科技股份有限公司 | Line voltage detection circuit and relevant detection method |
| CN107979264B (en) * | 2016-10-21 | 2019-10-11 | 通嘉科技股份有限公司 | Line voltage detection circuit and relevant detection method |
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| CN103595390B (en) | 2017-05-03 |
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