CN102097924A - Drive control circuit for shunt-wound synchronous rectification tubes and switching power supply - Google Patents
Drive control circuit for shunt-wound synchronous rectification tubes and switching power supply Download PDFInfo
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Abstract
本发明公开了一种并联同步整流管的驱动控制电路，用于驱动及控制N个并联的同步整流管，N为正整数，该驱动控制电路具有用于获取负载电流信号的输入端和用于输出驱动信号的M个输出端，M为大于1但不大于N的正整数，M个输出端与N个同步整流管的驱动极连接，其中，每个同步整流管的驱动极与一个输出端连接，且每个输出端与至少一个同步整流管的驱动极连接，驱动控制电路根据负载电流信号的大小控制N个并联的同步整流管导通的个数。本发明实施例还提供相应的开关电源。本发明实施例提供的驱动控制电路能够根据负载的变化自适应调整导通的同步整流管的个数，从而实现既满足应用需要，又能降低在小负载场景下的驱动损耗，提高轻载效率。
The invention discloses a drive control circuit for parallel synchronous rectifier tubes, which is used to drive and control N parallel synchronous rectifier tubes, where N is a positive integer. The drive control circuit has an input terminal for obtaining load current signals and a M output terminals for outputting driving signals, M is a positive integer greater than 1 but not greater than N, and the M output terminals are connected to the drive poles of N synchronous rectifier tubes, wherein, the drive pole of each synchronous rectifier tube is connected to an output terminal and each output terminal is connected to the driving pole of at least one synchronous rectifier, and the drive control circuit controls the number of N parallel synchronous rectifiers to conduct according to the magnitude of the load current signal. The embodiment of the present invention also provides a corresponding switching power supply. The driving control circuit provided by the embodiment of the present invention can adaptively adjust the number of synchronous rectifiers that are turned on according to the change of the load, so as to not only meet the application requirements, but also reduce the driving loss in the small load scene and improve the light load efficiency .
Description
Technical field
The present invention relates to the synchronous rectification field, be specifically related to a kind of Drive and Control Circuit and Switching Power Supply of synchronous rectifier in parallel.
Background technology
(Synchronous Rectification, SR) technology is widely used in the Switching Power Supply, to improve the efficient of Switching Power Supply in synchronous rectification.Synchronous rectification is by adopting extremely low special power metal oxide layer semiconductor field-effect transistor (the Metal Oxide Semiconductor Field Effect Transistor of on state resistance, MOSFET), replace rectifier diode to reduce the rectification conduction loss as synchronous rectifier.For satisfying the application scenarios of high-power and big electric current, and reduce loss, the application of synchronous rectifier multitube parallel occurred.Fig. 1 is synchronous rectifier three pipes schematic diagrames in parallel.
Please refer to Fig. 2, when existing synchronous rectifier parallel connection was used, synchronous rectifier Q1 was that grid links together to the driving stage of Qn, is connected with an output of drive circuit.Drive signal of drive circuit output is controlled all synchronous rectifiers, thereby the state of the synchronous rectifier of a plurality of parallel connections has only two kinds: all-pass or complete disconnected.
During underloading, complete disconnected if the synchronous rectifier of a plurality of parallel connections switches to from all-pass, Switching Power Supply switches to discontinuous operating state from continuous duty, can cause the Switching Power Supply dynamic response slow, and output easily produces overshoot.When load strengthens,, then can cause the output generation of Switching Power Supply to be fallen if the synchronous rectifier of a plurality of parallel connections switches to all-pass from complete breaking.For fear of the problem that this switching brings, synchronous rectifier is generally operational in the all-pass state in the practical application.Thereby Switching Power Supply drive loss in the very little application scenarios of load is big, and efficient is low, can not optimize at the load state implementation efficiency.
Summary of the invention
The embodiment of the invention provides a kind of Drive and Control Circuit and Switching Power Supply of synchronous rectifier in parallel, to realize adjusting according to the variation self adaptation of load the number of the synchronous rectifier of conducting.
A kind of Drive and Control Circuit of synchronous rectifier in parallel, be used to drive and control N synchronous rectifier in parallel, N is a positive integer, this Drive and Control Circuit has M the output that is used to obtain the input of load current signal and is used for output drive signal, M is for greater than 1 but be not more than the positive integer of N, a described M output is connected with the driving stage of described N synchronous rectifier in parallel, wherein, the driving stage of each synchronous rectifier is connected with an output of Drive and Control Circuit, and each output of Drive and Control Circuit is connected with the driving stage of at least one synchronous rectifier, the number of effective drive signal that described Drive and Control Circuit is exported according to the described M of the size adjustment of a described load current signal output is to control the number of described N synchronous rectifier conducting in parallel.
A kind of Switching Power Supply comprises: N synchronous rectifier in parallel and the Drive and Control Circuit that is used to drive and control described N synchronous rectifier in parallel, and N is a positive integer;
Described Drive and Control Circuit has M the output that is used to obtain the input of load current signal and is used for output drive signal, M is for greater than 1 but be not more than the positive integer of N, a described M output is connected with the driving stage of described N synchronous rectifier in parallel, wherein, the driving stage of each synchronous rectifier is connected with an output of Drive and Control Circuit, and each output of Drive and Control Circuit is connected with the driving stage of at least one synchronous rectifier, the number of effective drive signal that Drive and Control Circuit is exported according to the described M of the size adjustment of a described load current signal output is to control the number of described N synchronous rectifier conducting in parallel.
The Drive and Control Circuit that the embodiment of the invention provides adopts input to connect load current signal, output is then exported the technical scheme of M control signal with N synchronous rectifier in parallel of control, can adjust the number of the synchronous rectifier of conducting according to the variation self adaptation of load, make the conducting of synchronous rectification tube portion, thereby realize both having satisfied application need, can be reduced in the drive loss under the little load scene again, improve light-load efficiency.
Description of drawings
Fig. 1 is existing synchronous rectifier three pipes schematic diagrames in parallel;
Fig. 2 is the schematic diagram of the Drive and Control Circuit of existing synchronous rectifier in parallel;
Fig. 3 is the schematic diagram of the Drive and Control Circuit of one embodiment of the invention synchronous rectifier in parallel;
Fig. 4 is the schematic diagram of the Drive and Control Circuit of another embodiment of the present invention synchronous rectifier in parallel;
Fig. 5 is the schematic diagram of the Drive and Control Circuit of another embodiment of the present invention synchronous rectifier in parallel;
Fig. 6 be in the embodiment of the invention high-low level logical signal and pwm signal with schematic diagram.
Embodiment
The embodiment of the invention provides a kind of Drive and Control Circuit of synchronous rectifier in parallel, employing connects load current signal by input, the technical scheme of M control signal of output with N synchronous rectifier in parallel of control brought in M output, can adjust the number of the synchronous rectifier of conducting according to the variation self adaptation of load, make the conducting of synchronous rectification tube portion, thereby realize both having satisfied application need, can be reduced in the drive loss under the little load scene again, improve light-load efficiency.The embodiment of the invention also provides corresponding Switching Power Supply.Below describe respectively.
Please refer to Fig. 3, the embodiment of the invention provides a kind of Drive and Control Circuit of synchronous rectifier in parallel, be used to drive and control N synchronous rectifier Q1 in parallel, Q2......Qn, N is a positive integer, this Drive and Control Circuit has M the output that is used to obtain the input of load current signal and is used for output drive signal, M is for greater than 1 but be not more than the positive integer of N, M output is connected with the driving stage of N synchronous rectifier in parallel, wherein, the driving stage of each synchronous rectifier is connected with an output of Drive and Control Circuit, and each output of Drive and Control Circuit is connected with the driving stage of at least one synchronous rectifier, the number of effective drive signal that Drive and Control Circuit is exported according to size adjustment M output of load current signal is with the number of the synchronous rectifier conducting of M parallel connection of control.
The Drive and Control Circuit of the embodiment of the invention, its input connects load current signal, it is a kind of adaptive Drive and Control Circuit, and, M output control N synchronous rectifier with M drive signal of output by being provided, can adjust the number of the synchronous rectifier of conducting according to the variation self adaptation of load, make to go on foot the conducting of rectifying tube part, thereby realize both having satisfied application need, can be reduced in the drive loss under the little load scene again, improve light-load efficiency.
Wherein, synchronous rectifier can be MOSFET, and its driving stage is the grid of MOSFET.
M output with Drive and Control Circuit in the embodiment of the invention is connected with the driving stage of N synchronous rectifier, reaches the purpose that adopts M drive signal to control N synchronous rectifier, and its connected mode can have multiple, illustrates below:
At N is 2 o'clock, and can get M is 2.Promptly adopt two drive signals to control two synchronous rectifiers respectively, thereby can realize the all-pass of two synchronous rectifiers, complete disconnected, perhaps one of them conducting.
At N is 3 o'clock, and can get M is 2.With synchronous rectifier of one of them drive signal control, and control two other synchronous rectifier, can realize the all-pass of three synchronous rectifiers with another drive signal, complete disconnected, one of them conducting or wherein two conductings.Certainly, getting M is 3, with synchronous rectifier of a control signal control, also can realize above-mentioned effect.
At N is 4 or greater than 4 o'clock, and M optionally value is more, and connected mode also can have more.
As seen, for each N value, M can have one or more values, the M minimum can be N for 2 maximums, thereby multiple connected mode can be arranged, as long as satisfy: the driving stage of each synchronous rectifier is connected with an output of Drive and Control Circuit, and each output of Drive and Control Circuit is connected with the driving stage of at least one synchronous rectifier and gets final product.Present embodiment is not done qualification for concrete connected mode.
In the embodiment of the invention, the size of load in the load current signal reflection application scenarios that the input of Drive and Control Circuit obtains.Thereby, Drive and Control Circuit can be exported the number of the output of effective drive signal according to the size decision of load current signal, wherein effectively drive signal is meant the signal that can make the synchronous rectifier conducting, thereby can control the number of the synchronous rectifier of conducting, accomplish both to satisfy application need, again can balance conduction loss and drive loss, reach optimum efficiency.For example, when load current signal increased, illustrating needed more MOSFET conducting just can satisfy the demand, and can increase the number of the output of the effective drive signal of output this moment; When load current signal reduced, illustrating needed less MOSFET conducting to satisfy the demand, and can reduce the number of the output of the effective drive signal of output this moment.Thereby can be when different loads, the MOSFET of the different numbers of conducting makes drive loss and conduction loss reach balance, accomplish both to satisfy application need, can be reduced in the drive loss under the little load scene again, improve light-load efficiency, thereby increase work efficiency, and guarantee that the output response is normal.
Please refer to Fig. 4, in the another embodiment of the present invention, Drive and Control Circuit can comprise: the drive circuit 200 that is connected with N synchronous rectifier in parallel, and the control circuit 100 that is connected with drive circuit 200.
In the present embodiment, the M of a digitial controller signal output part can all be the pwm signal output.Digitial controller can determine this M all or part of output pwm signal of signal output part according to the size of load current signal, thus all or part of conducting of control synchronous flow rectifying tube.
In concrete the application, at full load, digitial controller is by M signal output part output M pwm signal PWM1, PWM2......PWMm, with N synchronous rectifier all-pass of control.When load current signal reduces, can reduce the number of the signal output part of output pwm signal, for example, only export L pwm signal, L is the positive integer less than M, two outer M subtract L pwm signal output and then export zero, thereby realize the synchronous rectifier conducting of L pwm signal correspondence, and another part synchronous rectifier turn-offs; Certainly, when load current signal increases, also can increase the number of the signal output part of output pwm signal, the synchronous rectifier of conducting is increased.Thereby realize adaptive synchronous rectifier switch control.
Please refer to Fig. 5, on the basis of a last embodiment, among another embodiment of the present invention:
The M of a digitial controller output can comprise that M deducts K pwm signal output and K high-low level logical signal output, and K is the positive integer less than M.High-low level logical signal output is used to export high-low level logical signal Sx.(General Purpose IO Ports GPIO) produces this high-low level logical signal Sx, can be common acyclic logical signal, for example can be a lasting high level signal by the universal I interface of digitial controller.Because high-low level logical signal Sx effective control signal not necessarily, therefore need with high-low level logical signal and pwm signal by with Men Xiangyu after pwm signal of generation as effective control signal.Please refer to Fig. 6, the high-low level logical signal of any high-low level logical signal output output can with the pwm signal of a pwm signal output output by with Men Xiangyu after produce a pwm signal in addition.Digitial controller can be exported the number of the signal output part of effective control signal according to the size decision of load current signal.
In concrete the application: when the number P that exports the signal output part of effective control signal at needs subtracts K less than M, can utilize M to subtract K pwm signal and directly export P pwm signal; When the number P that exports the signal output part of effective control signal at needs subtracts K greater than M, can utilize M to subtract K pwm signal output directly exports M and subtracts K pwm signal, other effective control signal subtracts (M subtracts K) individual high-low level logical signal output output high-low level logical signal by P, this P subtract (M subtracts K) individual high-low level logical signal respectively with pwm signal by with Men Xiangyu after produce other P and subtract (M subtracts K) individual pwm signal, thereby finally produce P effectively pwm signal as control signal.
Particularly at full load, can directly export M and subtract K effectively pwm signal, and K effective high-low level logical signal S1, S2......Sk, this K high-low level logical signal respectively with M subtract in K the pwm signal one or more pwm signals by with Men Xiangyu after produce K pwm signal, thereby finally export M pwm signal PWM1, PWM2......PWMm, with N synchronous rectifier all-pass of control.
When load current signal reduces, can reduce the number of signal output part of the effective Sx signal of output, by several Sx signals being changed to zero, can realize part conducting in N the synchronous rectifier, be that the synchronous rectifier of zero Sx signal correspondence then turn-offs; Certainly, when load current signal increases, also can increase the number of the signal output part of the effective Sx signal of output, the synchronous rectifier of conducting is increased.Thereby realize adaptive synchronous rectifier switch control.
Because the easier realization of digitial controller output high-low level logical signal Sx specific output pwm signal, thereby in the present embodiment digitial controller by with K high-low level logical signal Sx of output and pwm signal with after produce the scheme of K pwm signal again, with respect to the easier realization of the scheme of last embodiment, can alleviate the load of digitial controller, reduce the complexity of digitial controller.
The embodiment of the invention also provides a kind of Switching Power Supply, comprising: N synchronous rectifier in parallel and the Drive and Control Circuit that is used to drive and control N synchronous rectifier in parallel, and N is a positive integer;
This Drive and Control Circuit has M the output that is used to obtain the input of load current signal and is used for output drive signal, M is for greater than 1 but be not more than the positive integer of N, M output is connected with the driving stage of N synchronous rectifier in parallel, wherein, the driving stage of each synchronous rectifier is connected with an output of Drive and Control Circuit, and each output of Drive and Control Circuit is connected with the driving stage of at least one synchronous rectifier, the number of effective drive signal that Drive and Control Circuit is exported according to size adjustment M output of load current signal is with all or part of conducting of synchronous rectifier of N parallel connection of control.
Wherein, Drive and Control Circuit can be exported the number of the output of effective drive signal according to the size decision of load current signal, thus the number of the synchronous rectifier of control conducting.
Further, when load current signal increased, Drive and Control Circuit can increase the number of the output of the effective drive signal of output; When load current signal reduced, Drive and Control Circuit can reduce the number of the output of the effective drive signal of output.
Further, Drive and Control Circuit can comprise: the drive circuit that is connected with N synchronous rectifier in parallel, and the control circuit that is connected with drive circuit;
Control circuit comprises the input that is used to obtain load current signal, also comprises M the signal output part that is used to export control signal, and this control circuit is used for the number according to the signal output part of the effective control signal of size decision output of load current signal;
Drive circuit comprises M the output that is used for output drive signal, also comprises M the signal input part that is connected with M signal output part of control circuit, and this drive circuit is used for control signal is amplified to produce drive signal.
The Switching Power Supply that the embodiment of the invention provides can be adjusted the number of the synchronous rectifier of conducting according to the variation self adaptation of load, realizes the part conducting of synchronous rectifier, thereby raises the efficiency.
More than the Drive and Control Circuit and the Switching Power Supply of the synchronous rectifier in parallel that the embodiment of the invention provided is described in detail, having used specific case herein sets forth principle of the present invention and execution mode, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof, should not be construed as limitation of the present invention.
Claims (12)
1. the Drive and Control Circuit of a synchronous rectifier in parallel is used to drive and control N synchronous rectifier in parallel, and N is a positive integer, it is characterized in that:
This Drive and Control Circuit has M the output that is used to obtain the input of load current signal and is used for output drive signal, M is for greater than 1 but be not more than the positive integer of N, a described M output is connected with the driving stage of described N synchronous rectifier in parallel, wherein, the driving stage of each synchronous rectifier is connected with an output of Drive and Control Circuit, and each output of Drive and Control Circuit is connected with the driving stage of at least one synchronous rectifier, the number of effective drive signal that described Drive and Control Circuit is exported according to the described M of the size adjustment of a described load current signal output is to control the number of described N synchronous rectifier conducting in parallel.
2. Drive and Control Circuit according to claim 1 is characterized in that:
Described Drive and Control Circuit is according to the number of the output of the effective drive signal of size decision output of described load current signal, thus the number of the synchronous rectifier of control conducting.
3. Drive and Control Circuit according to claim 2 is characterized in that:
When described load current signal increased, described Drive and Control Circuit increased the number of the output of the effective drive signal of output;
When described load current signal reduced, described Drive and Control Circuit reduced the number of the output of the effective drive signal of output.
4. according to each described Drive and Control Circuit in the claim 1 to 3, it is characterized in that described Drive and Control Circuit comprises: the drive circuit that is connected with described N synchronous rectifier in parallel, and the control circuit that is connected with described drive circuit;
Described control circuit, comprise the described input that is used to obtain load current signal, also comprise M the signal output part that is used to export control signal, this control circuit is used for the number according to the signal output part of the effective control signal of size decision output of described load current signal;
Described drive circuit comprises described M the output that is used for output drive signal, also comprises M the signal input part that is connected with M signal output part of described control circuit, and this drive circuit is used for described control signal is amplified to produce drive signal.
5. Drive and Control Circuit according to claim 4 is characterized in that described control circuit comprises: digitial controller.
6. Drive and Control Circuit according to claim 5 is characterized in that, the control signal of the signal output part output of described digitial controller comprises: pulse width modulation (PWM) signal, perhaps high-low level logical signal.
7. Drive and Control Circuit according to claim 6 is characterized in that:
A described M signal output part is the pwm signal output.
8. Drive and Control Circuit according to claim 6 is characterized in that:
A described M signal output part comprises that M deducts K pwm signal output and K high-low level logical signal output, K is the positive integer less than M, wherein, the high-low level logical signal of any high-low level logical signal output output can with pwm signal by with Men Xiangyu after produce a pwm signal in addition.
9. Switching Power Supply comprises: N synchronous rectifier in parallel and the Drive and Control Circuit that is used to drive and control the synchronous rectifier of described N parallel connection, and N is a positive integer, it is characterized in that:
Described Drive and Control Circuit has M the output that is used to obtain the input of load current signal and is used for output drive signal, M is for greater than 1 but be not more than the positive integer of N, a described M output is connected with the driving stage of described N synchronous rectifier in parallel, wherein, the driving stage of each synchronous rectifier is connected with an output of Drive and Control Circuit, and each output of Drive and Control Circuit is connected with the driving stage of at least one synchronous rectifier, the number of effective drive signal that described Drive and Control Circuit is exported according to the described M of the size adjustment of a described load current signal output is to control the number of described N synchronous rectifier conducting in parallel.
10. Switching Power Supply according to claim 9 is characterized in that:
Described Drive and Control Circuit is according to the number of the output of the effective drive signal of size decision output of described load current signal, thus the number of the synchronous rectifier of control conducting.
11. Switching Power Supply according to claim 10 is characterized in that:
When described load current signal increased, described Drive and Control Circuit increased the number of the output of the effective drive signal of output;
When described load current signal reduced, described Drive and Control Circuit reduced the number of the output of the effective drive signal of output.
12., it is characterized in that described Drive and Control Circuit comprises: the drive circuit that is connected with described N synchronous rectifier in parallel, and the control circuit that is connected with described drive circuit according to each described Switching Power Supply in the claim 10 to 11;
Described control circuit, comprise the described input that is used to obtain load current signal, also comprise M the signal output part that is used to export control signal, this control circuit is used for the number according to the signal output part of the effective control signal of size decision output of described load current signal;
Described drive circuit comprises described M the output that is used for output drive signal, also comprises M the signal input part that is connected with M signal output part of described control circuit, and this drive circuit is used for described control signal is amplified to produce drive signal.
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| CN103425170A (en) * | 2012-05-22 | 2013-12-04 | 联合聚晶股份有限公司 | Power supply circuit capable of adapting to load change |
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| CN104218778A (en) * | 2013-05-30 | 2014-12-17 | 华硕电脑股份有限公司 | Power switch on electronic device and driving circuit thereof |
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| CN104682703B (en) * | 2015-01-30 | 2017-06-13 | 友达光电股份有限公司 | display and method for controlling converter |
| CN105991048A (en) * | 2015-03-04 | 2016-10-05 | 群光电能科技股份有限公司 | Synchronous rectifier control circuit and control method thereof |
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| CN109149912B (en) * | 2018-09-15 | 2020-12-25 | 福州大学 | Switching tube power loss and automatic adjusting circuit in switching power supply and working method |
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| CN110912410A (en) * | 2019-11-22 | 2020-03-24 | 深圳南云微电子有限公司 | Light load detection and power tube part conduction control method and circuit |
| CN113346748A (en) * | 2021-06-08 | 2021-09-03 | 广州金升阳科技有限公司 | Control circuit of synchronous rectification BUCK converter |
| CN113346748B (en) * | 2021-06-08 | 2022-08-19 | 广州金升阳科技有限公司 | Control circuit of synchronous rectification BUCK converter |
| CN114094846A (en) * | 2021-11-24 | 2022-02-25 | 深圳市群芯科创电子有限公司 | Synchronous rectification control circuit for realizing high-stability parallel application |
| CN114094846B (en) * | 2021-11-24 | 2023-09-08 | 深圳市群芯科创电子有限公司 | Synchronous rectification control circuit for realizing high-stability parallel application |
| WO2024244148A1 (en) * | 2023-05-31 | 2024-12-05 | 维谛公司 | Synchronous rectification driving method and apparatus, and device and direct-current converter |
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