CN110224619B - Secondary side synchronous rectification controller circuit capable of adaptively driving voltage adjustment cycle by cycle - Google Patents
Secondary side synchronous rectification controller circuit capable of adaptively driving voltage adjustment cycle by cycle Download PDFInfo
- Publication number
- CN110224619B CN110224619B CN201910512824.XA CN201910512824A CN110224619B CN 110224619 B CN110224619 B CN 110224619B CN 201910512824 A CN201910512824 A CN 201910512824A CN 110224619 B CN110224619 B CN 110224619B
- Authority
- CN
- China
- Prior art keywords
- cycle
- voltage
- mos tube
- circuit
- driving voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 39
- 230000003044 adaptive effect Effects 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 20
- 238000001514 detection method Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 10
- 230000033228 biological regulation Effects 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Abstract
The invention relates to a secondary side synchronous rectification controller circuit capable of self-adapting to drive voltage adjustment cycle by cycle, which is mainly applied to a flyback type switching power supply system. The cycle-by-cycle timing module records the time of each switching cycle, and automatically estimates the starting time node of the first MOS tube in the next cycle through the average time and the change trend of the N previous cycles, so that the second MOS tube on the secondary side is accurately turned off before the first MOS tube is started; before the loop current of the secondary side is reduced to zero or the first MOS tube is conducted, the self-adaptive driving voltage adjusting module is used for reducing the driving voltage amplitude, and then the second MOS tube is rapidly turned off, so that the risk that the primary side and the secondary side are conducted simultaneously is avoided no matter what working mode the flyback switching power supply system is in, and meanwhile, the conversion efficiency of the system is improved to the greatest extent.
Description
Technical Field
The invention relates to the field of a secondary side synchronous rectification circuit of AC-DC, in particular to a secondary side synchronous rectification controller circuit capable of adaptively driving voltage adjustment cycle by cycle.
Background
At present, flyback AC-DC is widely applied to the field of low-power chargers and adapters. With the increase of the battery capacity of the handheld device and the increase of the complexity of the electric equipment, a charger and an adapter with low power consumption and high power density are becoming mainstream, and the problem of heat dissipation is becoming an issue to be solved urgently.
The existing synchronous rectification circuit can only be matched with one or a plurality of primary side controller architectures, and the synchronous rectification circuit has the following modes: the first method is to realize DCM and QR mode synchronous rectification by using a zero current comparator, the working block diagram is shown in figure 1, the zero current comparator directly samples the voltage at two ends of the MOS tube, and when the voltage (equivalent to loop current) on the MOS tube is gradually reduced to be approximately-15 mV, the MOS tube is turned off, and the zero current comparison is not really realized, but only can be used in DCM and QR flyback structures, and the zero current comparator cannot be applied to a primary side controller with CCM working mode; the second method is to realize DCM synchronous rectification by using an area method, and the working block diagram is shown in figure 2. The method has the defects that the method only can work in a controller framework of a DCM mode and cannot be suitable for other types of primary side controller frameworks, and because of the primary side DCM controller framework, only the application with the output power section smaller than 15W can be met, and meanwhile, different transformers and controller structures are required to be arranged on the periphery of the application, so that the user experience effect is poor; thirdly, synchronous rectification of DCM, CCM, QR is realized by using voltage waveform detection, and a working block diagram is shown in fig. 3, the structure prejudges the action of a primary side controller by detecting the voltage waveform of a Drain end of an MOS tube, and because the MOS tube has larger junction capacitance, miller platform effect, synchronous rectification signal transmission delay and other factors, the total delay time of the system has certain discrete time, the actual action time and logic interpretation time have longer delay, and the moment that the primary side power MOS tube and the secondary side power MOS tube are simultaneously conducted under the heavy load or load dynamic change environment exists, the moment releases the energy stored in a transformer, and meanwhile, a relatively high flyback voltage peak voltage is generated on the synchronous rectification MOS tube, and the MOS tube is easily broken down by a high voltage peak, so that the whole system is invalid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a secondary side synchronous rectification controller circuit capable of adjusting the driving voltage in a cycle-by-cycle self-adaptive manner, which can effectively improve the conversion efficiency of a system, reduce the heat loss of a power supply system, can be matched with all primary side controller architectures, comprises control modes such as a discontinuous mode (DCM) quasi-resonant mode (QR), a continuous mode (CCM) and the like, has wider applicability, and has the characteristics of high efficiency, high reliability, low cost and the like.
The aim and the technical problems of the invention can be achieved by adopting the following technical proposal.
The invention provides a secondary side synchronous rectification controller circuit for adjusting a cycle-by-cycle self-adaptive driving voltage, which comprises a primary controller, a first MOS tube, a transformer, a second MOS tube, a self-adaptive driving voltage adjusting module, a cycle-by-cycle timing module, a reference voltage module and an output capacitor, wherein the primary controller is connected with the first MOS tube; the primary controller is connected with the first MOS tube, the first MOS tube is connected with the primary side of the transformer, the second MOS tube is connected between the low end of the secondary side of the transformer and the output ground end, the Drain end of the second MOS tube is connected with the low end of the secondary side of the transformer, and the Source end of the second MOS tube is connected with the ground end of the output end of the secondary side of the transformer; the output capacitor is connected between the Vout end of the output end of the secondary side of the transformer and the ground end; the input end of the self-adaptive driving voltage adjusting module is respectively connected with the Drain end of the second MOS tube, the output end of the cycle-by-cycle timing module and the output end of the reference voltage module, and the output end of the self-adaptive driving voltage adjusting module is connected with the Gate end of the second MOS tube; and the input end of the cycle-by-cycle timing module is connected with the Drain end of the second MOS tube.
The self-adaptive driving voltage adjusting module comprises a VDS feedback voltage detecting circuit, a sampling and holding circuit, a threshold voltage selecting circuit, a driving voltage adjusting circuit and a driving circuit; the VDS feedback voltage detection circuit detects the voltage difference between the Drain terminal and the Source terminal after the second MOS tube is started, and feeds back a voltage difference voltage signal between the Drain terminal and the Source terminal to the driving voltage regulating circuit; the sampling hold circuit is used for latching and holding the voltage difference between the Drain end and the Source end of the second MOS tube when the OE effective signal arrives; the threshold voltage selection circuit is used for selecting the reference voltage module to input reference voltage for the driving voltage regulating circuit before the OE effective signal arrives, and the reference voltage value is-30 mV; the threshold voltage selection circuit is used for selecting the voltage difference between the Drain end and the Source end of the second MOS tube which is latched in real time by the sampling and holding circuit as the input voltage of the driving voltage regulating circuit when the OE effective signal is effective; wherein the driving voltage regulating circuit regulates the amplitude of the output voltage; the driving circuit converts the input voltage signal into a signal with the capability of driving the second MOS tube to conduct on and off actions.
The cycle-by-cycle timing module comprises a current cycle counter circuit, a first N cycle counter buffer circuits, a current cycle second MOS tube starting time detection circuit, a primary side next cycle first MOS tube starting time estimation circuit and an adaptive driving time calculation circuit.
The first MOS tube starting time estimation circuit calculates the next starting time of the first MOS tube according to the average time and the change trend of the previous N periods; the self-adaptive driving moment calculating circuit calculates the starting time of the second MOS tube, starts counting down from an effective signal given by the second MOS tube starting moment detecting circuit in the current period, gives an OE signal to the self-adaptive driving voltage adjusting module when the counting down of the second MOS tube starting time is finished, keeps the time difference from the effective OE signal to the starting of the first MOS tube between 0.3us and 2us, automatically adjusts the driving voltage in the time period between 0.3us and 2us, and completes the turn-off action of the second MOS tube before the first MOS tube is started. .
The self-adaptive driving voltage adjusting module receives a voltage signal of the Drain end of the second MOS tube, a timing signal of the cycle-by-cycle timing module and a signal of the reference voltage module; before the timing signal of the cycle-by-cycle timing module arrives, and the VDS voltage of the second MOS tube is equal to a reference voltage value, the voltage value given by the reference voltage module is adopted to carry out feedback adjustment of the self-adaptive driving voltage; and when the timing signal of the cycle-by-cycle timing module arrives and does not enter the adjustment stage of the self-adaptive driving voltage, the VDS voltage is adopted to carry out feedback adjustment of the self-adaptive driving voltage.
By the technical scheme, the invention provides a secondary side synchronous rectification controller circuit capable of adaptively driving voltage adjustment cycle by cycle. Various primary side control architectures such as DCM, QR, CCM and the like can be widely supported. In the application of the DCM and QR controller architecture on the primary side, the stored energy of the transformer is completely released to the secondary side of the transformer before the primary side first MOS tube is turned on each time, the current of the secondary side is reduced to zero when the second MOS tube is turned off, and the VDS of the second MOS tube is correspondingly reduced to zero, so that the threshold voltage selection circuit selects the output of the reference voltage module as the input of the driving voltage adjustment circuit so as to realize the self-adaptive driving voltage adjustment function; in the CCM controller architecture application of the primary side, the stored energy of the transformer is not completely released to the secondary side of the transformer before the primary side first MOS tube is turned on every time, the current of the secondary side is not reduced to zero when the second MOS tube is turned off, the VDS voltage of the second MOS tube is still larger, the VDS voltage value depends on the releasing degree of the stored energy of the transformer, so that the threshold voltage selection circuit selects the signal latched by the sampling and holding circuit to be used as the input of the driving voltage regulating circuit when the OE signal is effective, and the self-adaptive driving voltage regulating function is realized.
Drawings
Fig. 1 to 3 are schematic structural diagrams of an exemplary synchronous rectification controller circuit.
Fig. 4 is a schematic structural diagram of a secondary side synchronous rectification controller circuit for cycle-by-cycle adaptive driving voltage adjustment according to the present invention.
Fig. 5 is a block diagram of an adaptive driving voltage adjustment module of a secondary side synchronous rectification controller circuit for cycle-by-cycle adaptive driving voltage adjustment according to the present invention.
Fig. 6 is a block diagram of a cycle-by-cycle timing module of a secondary side synchronous rectification controller circuit for cycle-by-cycle adaptive driving voltage regulation according to the present invention.
Fig. 7 is a timing diagram of a driving waveform of the secondary side synchronous rectification controller circuit for cycle-by-cycle adaptive driving voltage adjustment in CCM mode according to the present invention.
Fig. 8 is a timing chart of driving waveforms of the secondary side synchronous rectification controller circuit with cycle-by-cycle adaptive driving voltage adjustment in DCM and QR modes according to the present invention.
Detailed Description
In order to further describe the secondary side synchronous rectification controller circuit with the cycle-by-cycle adaptive driving voltage adjustment according to the present invention, the technical means adopted to achieve the purpose of the preset invention and the effects achieved by the technical means are described in detail below with reference to the accompanying drawings and the preferred embodiments, wherein the specific implementation, structure, characteristics and effects of the secondary side synchronous rectification controller circuit with the cycle-by-cycle adaptive driving voltage adjustment according to the present invention are provided.
Referring to fig. 1 to 3, schematic diagrams of exemplary synchronous rectification controller circuits are shown.
In fig. 1, in order to realize DCM and QR mode synchronous rectification by using a zero-current comparator, the zero-current comparator directly samples the voltage at two ends of the MOS transistor, and when the voltage (equivalent to loop current) on the MOS transistor is gradually reduced to approximately-15 mV, the MOS transistor is turned off, which is not a true zero-current comparison, but only used in two flyback structures of DCM and QR, and is not suitable for a primary side controller with CCM operation mode.
In fig. 2, in order to implement DCM synchronous rectification by using the area method, the method has the disadvantage that the method can only work in a controller architecture of DCM mode, cannot be suitable for other types of primary side controller architectures, and can only meet the requirement of application with an output power section smaller than 15W due to the primary side DCM controller architecture, and meanwhile, the application needs to be provided with a peripheral transformer and a controller structure which are matched with different types, so that the user experience effect is poor.
In fig. 3, in order to implement DCM, CCM, QR synchronous rectification by using voltage waveform detection, the structure prejudges the action of the primary side controller by detecting the voltage waveform of the Drain end of the MOS tube, and because the MOS tube has larger junction capacitance, miller platform effect, synchronous rectification signal transmission delay and other factors, the total delay time of the system has certain discrete time, the actual action time and logic interpretation time have longer delay, and the moment that the primary side power MOS tube and the secondary side power MOS tube are simultaneously conducted under the heavy load or the load dynamic change environment exists, the moment releases the energy stored in the transformer, and meanwhile, a relatively high flyback voltage spike voltage is generated on the synchronous rectification MOS tube, and the high voltage spike easily breaks down the MOS tube, so that the whole system is invalid.
Referring to fig. 4 to 8, fig. 4 is a schematic structural diagram of a secondary side synchronous rectification controller circuit for cycle-by-cycle adaptive driving voltage adjustment according to the present invention; FIG. 5 is an internal block diagram of an adaptive driving voltage adjustment module according to the present invention; FIG. 6 is an internal block diagram of a cycle-by-cycle timing module according to the present invention; FIG. 7 is a schematic diagram of waveforms and timing sequences of a secondary side synchronous rectification controller circuit for cycle-by-cycle adaptive driving voltage regulation in CCM mode according to the present invention; fig. 8 is a schematic diagram of waveforms and timing sequences of the secondary side synchronous rectification controller circuit with cycle-by-cycle adaptive driving voltage adjustment in DCM and QR modes according to the present invention.
In fig. 4, the secondary side synchronous rectification controller circuit for cycle-by-cycle adaptive driving voltage adjustment of the present invention includes a primary controller, a first MOS transistor, a transformer, a second MOS transistor, an adaptive driving voltage adjustment module, a cycle-by-cycle timing module, a reference voltage module, and an output capacitor; the primary controller is connected with the first MOS tube, the first MOS tube is connected with the primary side of the transformer, the second MOS tube is connected between the low end of the secondary side of the transformer and the output ground end, the Drain end of the second MOS tube is connected with the low end of the secondary side of the transformer, and the Source end of the second MOS tube is connected with the ground end of the output end of the secondary side of the transformer; the output capacitor is connected between the Vout end of the output end of the secondary side of the transformer and the ground end; the input end of the self-adaptive driving voltage adjusting module is respectively connected with the Drain end of the second MOS tube, the output end of the cycle-by-cycle timing module and the output end of the reference voltage module, and the output end of the self-adaptive driving voltage adjusting module is connected with the Gate end of the second MOS tube; and the input end of the cycle-by-cycle timing module is connected with the Drain end of the second MOS tube.
In an embodiment, the adaptive driving voltage adjustment module adjusts the driving voltage of the second MOS transistor, and an internal block diagram of the adaptive driving voltage adjustment module is shown in fig. 5, where the adaptive driving voltage adjustment module includes a VDS feedback voltage detection circuit, a sample-and-hold circuit, a threshold voltage selection circuit, a driving voltage adjustment circuit, and a driving circuit; the VDS feedback voltage detection circuit detects the voltage difference between the Drain terminal and the Source terminal after the second MOS tube is started, and feeds back a voltage difference voltage signal between the Drain terminal and the Source terminal to the driving voltage regulating circuit; the sampling hold circuit is used for latching and holding the voltage difference between the Drain end and the Source end of the second MOS tube when the OE effective signal arrives; the threshold voltage selection circuit is used for selecting the reference voltage module to input reference voltage for the driving voltage regulating circuit before the OE effective signal arrives, and the reference voltage value is-30 mV; the threshold voltage selection circuit is used for selecting the voltage difference between the Drain end and the Source end of the second MOS tube which is latched in real time by the sampling and holding circuit as the input voltage of the driving voltage regulating circuit when the OE effective signal is effective; wherein the driving voltage regulating circuit regulates the amplitude of the output voltage; the driving circuit converts the input voltage signal into a signal with the capability of driving the second MOS tube to conduct on and off actions.
The VDS feedback voltage detection circuit sends a VDS voltage signal detected in real time to the driving voltage regulation circuit, the threshold voltage selection circuit sends a required voltage signal to the driving voltage regulation circuit, and the driving circuit receives an output signal of the driving voltage regulation circuit and drives the second MOS tube to conduct switching and regulation actions.
In one embodiment, the driving voltage adjusting circuit, the driving circuit, the second MOS transistor and the VDS feedback voltage detecting circuit together form a negative feedback loop; after the first MOS tube is turned off, the energy stored by the transformer is released through the secondary side, a current loop is formed through a body diode of the second MOS tube before the second MOS tube is not turned on, as shown in fig. 7 and 8, when the VDS voltage of the second MOS tube reaches VON (typical value is-0.7V), the second MOS tube is turned on, the second MOS tube is completely turned on at the moment T1, the VDS voltage amplitude is reduced, the driving voltage of the second MOS tube is an internal power supply voltage at the moment, the current flowing through the second MOS tube is gradually reduced along with the release of the energy of the transformer, and the VDS voltage amplitude is also reduced along with the gradual reduction of the current flowing through the second MOS tube; due to the regulation of the negative feedback loop and the gradual decrease of the loop current, as depicted by the waveform at time T2 in fig. 7, when the VDS voltage of the second MOS transistor gradually decreases to be the same as the given reference input voltage, the loop automatically decreases the driving voltage so that the second MOS transistor enters the saturation region to maintain VDS substantially unchanged, as depicted by the VREG voltage plateau region in the figure; when the loop current is further reduced, the VDS voltage amplitude is close to zero voltage, and at the moment, the negative feedback loop can pull down the output voltage of the driving voltage regulating circuit, and the driving voltage regulating circuit turns off the second MOS tube.
The sampling hold circuit receives the VDS voltage signal output by the VDS feedback voltage detection circuit, latches the VDS voltage at the moment when the OE effective signal arrives, and sends the VDS voltage to the threshold voltage selection circuit; before the threshold voltage selecting circuit receives the OE valid signal, a signal given by the reference voltage selecting module is selected to be output to the driving voltage regulating circuit, and when the OE signal becomes valid, the threshold voltage selecting circuit selects the VDS voltage latched by the sampling holding circuit to be output to the driving voltage regulating circuit.
In an embodiment, as shown in fig. 6, the cycle-by-cycle timing module includes a current cycle counter circuit, a first N cycle counter buffer circuits, a current cycle second MOS transistor turn-on time detection circuit, a primary next cycle first MOS transistor turn-on time estimation circuit, and an adaptive driving time calculation circuit; the first MOS tube turn-on time and turn-off time of the previous N periods are recorded by the counter buffer circuit of the previous N periods, and the first MOS tube turn-on time estimation circuit of the next period of the primary side calculates the next turn-on time of the first MOS tube according to the average time and the change trend of the previous N periods; the self-adaptive driving moment calculating circuit calculates the starting time of the second MOS tube, starts counting down from an effective signal given by the second MOS tube starting moment detecting circuit in the current period, gives an OE signal to the self-adaptive driving voltage adjusting module when the counting down of the second MOS tube starting time is finished, keeps the time difference from the effective OE signal to the starting of the first MOS tube between 0.3us and 2us, automatically adjusts the driving voltage in the time period between 0.3us and 2us, and completes the turn-off action of the second MOS tube before the first MOS tube is started.
The current period counter records the switching period of the current period, the on time and the off time of the first MOS tube and the second MOS tube; the first N period counter buffer modules record the time information of the first N switching periods of the period; the self-adaptive driving moment calculating circuit receives the starting time of the second MOS tube in the current period and the signal of the pre-estimating circuit of the starting moment of the first MOS tube in the next period of the primary side, automatically calculates the self-adaptive driving voltage adjusting moment of the second MOS tube, gives out indication signals from 0.3uS to 2uS (typical value 0.7 uS) before the first MOS tube is started, and the self-adaptive driving voltage adjusting circuit completes the actions of adjusting the driving voltage and turning off the second MOS tube.
In an embodiment, as shown in fig. 7, when the primary side works in CCM mode, the cycle-by-cycle timing module predicts the variation trend and the start time of the next cycle according to the average value and the variation trend of the switching time information of the previous N cycles, and advances by 0.3uS to 2uS (typical value 0.7 uS) to give the indication signal OE. As shown in fig. 7, at the time T2 to time T3, the waveform description is at the time T5 to time T6; when the primary side is operating in DCM and QR mode, the adaptive drive voltage adjustment phases are times T2 'to T3 and times T5' to T6, as shown in fig. 8. Wherein M1 represents a first MOS tube, and M2 represents a second MOS tube.
In an embodiment, if the OE valid signal arrives, when the VDS voltage of the second MOS transistor has not yet fallen to the preset value given by the reference voltage module, the threshold voltage selection circuit module selects the signal held by the sample-and-hold circuit at this time as the reference signal to output, where the VDS voltage of the second MOS transistor is maintained by the negative feedback loop at the voltage signal amplitude of the sample-and-hold circuit, and the waveforms of time T2 to time T3 and time T5 to time T6 shown in fig. 7; if the OE valid signal arrives, the VDS voltage of the second MOS transistor is already reduced to the voltage amplitude given by the reference voltage module, and the VDS voltage of the second MOS transistor is maintained at the voltage amplitude given by the reference voltage module by the negative feedback circuit, as shown by waveforms T2 'to T3 and T5' to T6 shown in FIG. 8.
Above, realized the function of a week cycle from secondary limit synchronous rectification controller of using drive voltage, through the timing prejudgement of cycle by cycle and self-adaptation drive voltage adjustment, the off-mode of negative feedback can satisfy almost all primary side controller structures, possesses extensive suitability.
The invention provides a secondary side synchronous rectification controller circuit for adjusting self-adaptive driving voltage cycle by cycle, wherein a self-adaptive driving voltage adjusting module automatically adjusts the driving voltage of a second MOS tube; the cycle-by-cycle timing module records time information of each switching cycle, the average value and the change trend of the previous N cycles are used for automatically estimating the starting time of the first MOS tube, the second MOS tube self-adaptive driving voltage adjustment indication signal is given out in advance of 0.3uS to 2uS (typical value 0.7 uS), and when the loop current is reduced and the VDS voltage amplitude is reduced below the preset reference input amplitude, the negative feedback loop automatically turns off the second MOS tube. The turn-off time of the second MOS tube can be prejudged through cycle-by-cycle detection and drive adjustment, the problem that the working modes of the DCM, QR and CCM are fully compatible is solved, and the advantages of the possibility of simultaneously conducting and damaging a power supply system on the primary side and the secondary side, simple circuit structure, wide output voltage range, low cost, simple peripheral application and the like are effectively avoided.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification and equivalent changes and modifications can be made to the above-mentioned embodiments according to the technical matters of the present invention without departing from the scope of the present invention.
Claims (4)
1. The secondary side synchronous rectification controller circuit for the cycle-by-cycle self-adaptive driving voltage adjustment is characterized by comprising a primary controller, a first MOS tube, a transformer, a second MOS tube, a self-adaptive driving voltage adjustment module, a cycle-by-cycle timing module, a reference voltage module and an output capacitor; the primary controller is connected with the first MOS tube, the first MOS tube is connected with the primary side of the transformer, the second MOS tube is connected between the low end of the secondary side of the transformer and the output ground end, the Drain end of the second MOS tube is connected with the low end of the secondary side of the transformer, and the Source end of the second MOS tube is connected with the ground end of the output end of the secondary side of the transformer; the output capacitor is connected between the Vout end of the output end of the secondary side of the transformer and the ground end; the input end of the self-adaptive driving voltage adjusting module is respectively connected with the Drain end of the second MOS tube, the output end of the cycle-by-cycle timing module and the output end of the reference voltage module, and the output end of the self-adaptive driving voltage adjusting module is connected with the Gate end of the second MOS tube; the input end of the cycle-by-cycle timing module is connected with the Drain end of the second MOS tube; the self-adaptive driving voltage adjustment module receives a voltage signal of the Drain end of the second MOS tube, a timing signal of the cycle-by-cycle timing module and a signal of the reference voltage module; before the timing signal of the cycle-by-cycle timing module arrives, and the VDS voltage of the second MOS tube is equal to a reference voltage value, the voltage value given by the reference voltage module is adopted to carry out feedback adjustment of the self-adaptive driving voltage; and when the timing signal of the cycle-by-cycle timing module arrives and does not enter the adjustment stage of the self-adaptive driving voltage, the VDS voltage is adopted to carry out feedback adjustment of the self-adaptive driving voltage.
2. The cycle-by-cycle adaptive drive voltage regulated secondary side synchronous rectification controller circuit of claim 1, wherein said adaptive drive voltage regulation module comprises a VDS feedback voltage detection circuit, a sample-and-hold circuit, a threshold voltage selection circuit, a drive voltage regulation circuit, and a drive circuit; the VDS feedback voltage detection circuit detects the voltage difference between the Drain terminal and the Source terminal after the second MOS tube is started, and feeds back a voltage difference voltage signal between the Drain terminal and the Source terminal to the driving voltage regulating circuit; the sampling hold circuit is used for latching and holding the voltage difference between the Drain end and the Source end of the second MOS tube when the OE effective signal arrives; the threshold voltage selection circuit is used for selecting the reference voltage module to input reference voltage for the driving voltage regulating circuit before the OE effective signal arrives, and the reference voltage value is-30 mV; the threshold voltage selection circuit is used for selecting the voltage difference between the Drain end and the Source end of the second MOS tube which is latched in real time by the sampling and holding circuit as the input voltage of the driving voltage regulating circuit when the OE effective signal is effective; wherein the driving voltage regulating circuit regulates the amplitude of the output voltage; the driving circuit converts the input voltage signal into a signal with the capability of driving the second MOS tube to conduct on and off actions.
3. The cycle-by-cycle adaptive drive voltage regulated secondary side synchronous rectification controller circuit of claim 1, wherein said cycle-by-cycle timing module comprises a current cycle counter circuit, a first N cycle counter buffer circuits, a current cycle second MOS transistor on time detection circuit, a primary side next cycle first MOS transistor on time estimation circuit, and an adaptive drive time calculation circuit.
4. The secondary side synchronous rectification controller circuit for cycle-by-cycle self-adaptive driving voltage adjustment according to claim 3, wherein the first N cycle counter buffer circuits record the first MOS transistor on and off time of the previous N cycles, and the primary side next cycle first MOS transistor on time estimation circuit calculates the next on time of the first MOS transistor according to the average time and the variation trend of the previous N cycles; the self-adaptive driving moment calculating circuit calculates the starting time of the second MOS tube, starts counting down from an effective signal given by the second MOS tube starting moment detecting circuit in the current period, gives an OE signal to the self-adaptive driving voltage adjusting module when the counting down of the second MOS tube starting time is finished, keeps the time difference from the effective OE signal to the starting of the first MOS tube between 0.3us and 2us, automatically adjusts the driving voltage in the time period between 0.3us and 2us, and completes the turn-off action of the second MOS tube before the first MOS tube is started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910512824.XA CN110224619B (en) | 2019-06-13 | Secondary side synchronous rectification controller circuit capable of adaptively driving voltage adjustment cycle by cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910512824.XA CN110224619B (en) | 2019-06-13 | Secondary side synchronous rectification controller circuit capable of adaptively driving voltage adjustment cycle by cycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110224619A CN110224619A (en) | 2019-09-10 |
| CN110224619B true CN110224619B (en) | 2024-06-04 |
Family
ID=
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533214A (en) * | 2016-12-21 | 2017-03-22 | 无锡硅动力微电子股份有限公司 | Switching power supply converter control circuit and control method thereof |
| CN108429468A (en) * | 2018-05-18 | 2018-08-21 | 陈畅 | It adaptively adjusts the synchronous rectifying controller of driving voltage and uses its circuit |
| CN210380682U (en) * | 2019-06-13 | 2020-04-21 | 无锡猎金半导体有限公司 | Secondary side synchronous rectification controller circuit capable of self-adapting to drive voltage adjustment cycle by cycle |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533214A (en) * | 2016-12-21 | 2017-03-22 | 无锡硅动力微电子股份有限公司 | Switching power supply converter control circuit and control method thereof |
| CN108429468A (en) * | 2018-05-18 | 2018-08-21 | 陈畅 | It adaptively adjusts the synchronous rectifying controller of driving voltage and uses its circuit |
| CN210380682U (en) * | 2019-06-13 | 2020-04-21 | 无锡猎金半导体有限公司 | Secondary side synchronous rectification controller circuit capable of self-adapting to drive voltage adjustment cycle by cycle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11671020B2 (en) | Flyback converter, control circuit and control method thereof | |
| US11764684B2 (en) | Systems and methods for regulating power conversion systems with output detection and synchronized rectifying mechanisms | |
| US10468975B2 (en) | Flyback converter, active clamp control circuit and active clamp control method | |
| Fu et al. | 1MHz high efficiency LLC resonant converters with synchronous rectifier | |
| CN110611431B (en) | Primary side regulation control system and control method of active clamp flyback converter | |
| CN111404403B (en) | Synchronous rectification control method and control circuit for self-adaptive detection time | |
| TWI493843B (en) | Multi-stage sampling circuit for a power converter controller | |
| EP3664295B1 (en) | Two-level switch driver for preventing avalanche breakdown for a synchronous rectification switch in a power converter operating in a low-power burst mode | |
| US20040264224A1 (en) | Structure and method for an isolated boost converter | |
| CN112087146B (en) | Control method and circuit of asymmetric half-bridge flyback converter | |
| US11632055B2 (en) | ACF converter, voltage conversion method, and electronic device | |
| WO2021179900A1 (en) | Switching power supply circuit, and secondary side control circuit and method for switching power supply circuit | |
| CN111555626A (en) | Control method and system of active clamp flyback converter | |
| CN108448902A (en) | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment and control method | |
| CN113726166B (en) | Flyback converter and control method thereof | |
| CN108667304A (en) | Synchronous rectification inverse-excitation type DC-DC power conversion equipment and control method | |
| CN102570834B (en) | The control circuit switched for the interval of power converter and method | |
| CN110224619B (en) | Secondary side synchronous rectification controller circuit capable of adaptively driving voltage adjustment cycle by cycle | |
| CN208158436U (en) | A kind of synchronous rectification inverse-excitation type DC-DC power conversion equipment | |
| CN210380682U (en) | Secondary side synchronous rectification controller circuit capable of self-adapting to drive voltage adjustment cycle by cycle | |
| US10924020B1 (en) | Prestart control circuit for a switching power converter | |
| Xiao et al. | Primary-side controlled flyback converter with current compensation in micro-power applications | |
| CN113852218A (en) | Object detection apparatus and method for wireless power transfer system | |
| US20230308010A1 (en) | Switching power supply and electronic device | |
| CN110224619A (en) | Secondary side synchronous rectification controller circuit capable of self-adapting to drive voltage adjustment cycle by cycle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 214115 c1-6f, China Sensor Network International Innovation Park, 200 Linghu Avenue, Wuxi City, Jiangsu Province Applicant after: Jiangsu Xintan Microelectronics Co.,Ltd. Address before: 214135 b340, China Sensor Network International Innovation Park, 200 Linghu Avenue, Xinwu District, Wuxi City, Jiangsu Province Applicant before: WUXI LIEJIN SEMICONDUCTOR CO.,LTD. |
|
| GR01 | Patent grant |