CN102097924B - 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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- CN102097924B CN102097924B CN201110036242.2A CN201110036242A CN102097924B CN 102097924 B CN102097924 B CN 102097924B CN 201110036242 A CN201110036242 A CN 201110036242A CN 102097924 B CN102097924 B CN 102097924B
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Abstract
The invention discloses a drive control circuit for shunt-wound synchronous rectification tubes, which is used for driving and controlling the N shunt-wound synchronous rectification tubes, wherein N is a positive integer. The drive control circuit has an input end and M output ends, wherein the input end is used for acquiring a load current signal; the M output ends are used for outputting driving signals; M is the positive integer more than or equal to N; the M output ends are connected with drive electrodes of the N synchronous rectification tubes; the drive electrode of each synchronous rectification tube is connected with one output end; each output end is connected with the drive electrode of at least one synchronous rectification tube; and the drive control circuit controls the number of switched-on synchronous rectification tubes of the N shunt-wound synchronous rectification tubes according to the magnitude of the load current signal. The embodiment of the invention also provides a corresponding switching power supply. The drive control circuit provided by the embodiment of the invention can adaptively adjust the number of the switched-on synchronous rectification tubes according to the change of a load, thereby satisfying application needs, reducing the drive loss under low-load condition and improve 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 shunt-wound synchronous rectification tubes.
Background technology
Synchronous rectification (Synchronous Rectification, SR) technology is widely used in Switching Power Supply, to improve the efficiency of Switching Power Supply.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), as synchronous rectifier, replace rectifier diode to reduce the rectification conduction loss.For meeting the application scenarios of high-power and large electric current, and reduce loss, the application of synchronous rectifier multitube parallel occurred.Fig. 1 is synchronous rectifier three pipe schematic diagram in parallel.
Please refer to Fig. 2, during the use in parallel of existing synchronous rectifier, synchronous rectifier Q1 is that grid links together to the driving stage of Qn, with an output of drive circuit, is connected.One of drive circuit output drives signal to control all synchronous rectifiers, thereby the state of the synchronous rectifier of a plurality of parallel connections only has two kinds: all-pass or complete disconnected.
During underloading, complete disconnected if the synchronous rectifier of a plurality of parallel connections is switched to from all-pass, Switching Power Supply is switched to discontinuous operating state from continuous duty, can cause the Switching Power Supply dynamic response slow, and output easily produces overshoot.When load strengthens, if the synchronous rectifier of a plurality of parallel connections is switched to all-pass from complete breaking, can cause the output generation of Switching Power Supply to be fallen.The problem of bringing for fear of this switching, in practical application, synchronous rectifier is generally operational in the all-pass state.Thereby, in the Switching Power Supply application scenarios very little in load, drive loss large, efficiency is low, can not optimize for the load state implementation efficiency.
Summary of the invention
The embodiment of the present invention provides a kind of Drive and Control Circuit and Switching Power Supply of shunt-wound synchronous rectification tubes, 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 shunt-wound synchronous rectification tubes, for driving and control N synchronous rectifier in parallel, N is positive integer, this Drive and Control Circuit has input for obtaining load current signal and for M output of output drive signal, M is greater than 1 but be not more than the positive integer of N, the driving stage of the synchronous rectifier that a described M output is in parallel with described N is connected, 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 driving 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, 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 for driving and control the Drive and Control Circuit of the synchronous rectifier of described N parallel connection, and N is positive integer;
Described Drive and Control Circuit has input for obtaining load current signal and for M output of output drive signal, M is greater than 1 but be not more than the positive integer of N, the driving stage of the synchronous rectifier that a described M output is in parallel with described N is connected, 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 driving signal that Drive and Control Circuit is exported according to the described M of the size adjustment of a described load current signal output, to control the number of described N synchronous rectifier conducting in parallel.
The Drive and Control Circuit that the embodiment of the present invention provides adopts input to connect load current signal, output is exported M control signal to control the technical scheme of N synchronous rectifier in parallel, can adjust according to the variation self adaptation of load the number of the synchronous rectifier of conducting, make the conducting of synchronous rectification tube portion, thereby realize both meeting the application needs, can be reduced in again the driving loss under little load scene, improve light-load efficiency.
The accompanying drawing explanation
Fig. 1 is existing synchronous rectifier three pipe schematic diagram in parallel;
Fig. 2 is the schematic diagram of the Drive and Control Circuit of existing shunt-wound synchronous rectification tubes;
Fig. 3 is the schematic diagram of the Drive and Control Circuit of one embodiment of the invention shunt-wound synchronous rectification tubes;
Fig. 4 is the schematic diagram of the Drive and Control Circuit of another embodiment of the present invention shunt-wound synchronous rectification tubes;
Fig. 5 is the schematic diagram of the Drive and Control Circuit of another embodiment shunt-wound synchronous rectification tubes of the present invention;
Fig. 6 be in the embodiment of the present invention low and high level logical signal and pwm signal phase and schematic diagram.
Embodiment
The embodiment of the present invention provides a kind of Drive and Control Circuit of shunt-wound synchronous rectification tubes, employing connects load current signal by input, M output is brought in M control signal of output to control the technical scheme of N synchronous rectifier in parallel, can adjust according to the variation self adaptation of load the number of the synchronous rectifier of conducting, make the conducting of synchronous rectification tube portion, thereby realize both meeting the application needs, can be reduced in again the driving loss under little load scene, improve light-load efficiency.The embodiment of the present invention also provides corresponding Switching Power Supply.Below describe respectively.
Please refer to Fig. 3, the embodiment of the present invention provides a kind of Drive and Control Circuit of shunt-wound synchronous rectification tubes, for driving and control N synchronous rectifier Q1 in parallel, Q2......Qn, N is positive integer, this Drive and Control Circuit has input for obtaining load current signal and for M output of output drive signal, M is greater than 1 but be not more than the positive integer of N, M output is connected with the driving stage of the synchronous rectifier of N parallel connection, 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 driving signal that Drive and Control Circuit is exported according to size adjustment M output of load current signal, to control the number of M synchronous rectifier conducting in parallel.
The Drive and Control Circuit of the embodiment of the present invention, its input connects load current signal, it is a kind of adaptive Drive and Control Circuit, and by providing M output to drive signal to control N synchronous rectifier with M of output, can adjust the number of the synchronous rectifier of conducting according to the variation self adaptation of load, make the conducting of step rectifying tube part, thereby realize both meeting the application needs, can be reduced in again the driving loss under little load scene, improve light-load efficiency.
Wherein, synchronous rectifier can be MOSFET, and its driving stage is the grid of MOSFET.
In the embodiment of the present invention, the M of a Drive and Control Circuit output is connected with the driving stage of N synchronous rectifier, reaches the purpose that adopts M to drive signal to control N synchronous rectifier, its connected mode can have multiple, below illustrates:
At N, be 2 o'clock, can get M is 2.Adopt two to drive signal to control respectively two synchronous rectifiers, thereby can realize the all-pass of two synchronous rectifiers, complete disconnected, or one of them conducting.
At N, be 3 o'clock, can get M is 2.Drive synchronous rectifier of signal controlling with one of them, and drive two other synchronous rectifier of signal controlling with another, can realize the all-pass of three synchronous rectifiers, complete disconnected, one of them conducting or wherein two conductings.Certainly, getting M is 3, with a control signal, controls a synchronous rectifier, also can realize above-mentioned effect.
Be 4 or be greater than at 4 o'clock at N, the optional value of M is more, and connected mode also can have more.
Visible, 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 meet: 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 and gets final product with the driving stage of at least one synchronous rectifier.The present embodiment is not done restriction for concrete connected mode.
In the embodiment of the present 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 determine that according to the size of load current signal output effectively drives the number of the output of signal, wherein effectively drive signal to refer to the signal that can make the synchronous rectifier conducting, thereby can control the number of the synchronous rectifier of conducting, accomplish both to meet the application needs, again can the balance conduction loss and drive loss, reach optimum efficiency.For example, when load current signal increases, illustrate and need more MOSFET conducting just can satisfy the demand, now can increase output and effectively drive the number of the output of signal; When load current signal reduces, illustrate and need less MOSFET conducting to satisfy the demand, now can reduce output and effectively drive the number of the output of signal.Thereby can be when different loads, the MOSFET of the different numbers of conducting, make and drive loss and conduction loss to reach balance, accomplish both to meet the application needs, can be reduced in again the driving loss under little load scene, improve light-load efficiency, thereby increase work efficiency, and guarantee that the output response is normal.
Please refer to Fig. 4, in another embodiment of the present invention, Drive and Control Circuit can comprise: the drive circuit 200 that the synchronous rectifier in parallel with N is connected, and the control circuit 100 be connected with drive circuit 200.
In the present embodiment, the M of a digitial controller signal output part can be all the pwm signal output.Digitial controller can determine according to the size of load current signal this M all or part of output pwm signal of signal output part, thereby controls all or part of conducting of synchronous stream rectifying tube.
In concrete application, at full load, digitial controller is by M signal output part output M pwm signal PWM1, PWM2......PWMm, to control N synchronous rectifier all-pass.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 that is less than M, two outer M subtract L pwm signal output and export zero, thereby realize L the synchronous rectifier conducting that pwm signal is corresponding, 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 upper embodiment, in another embodiment of the present invention:
The M of a digitial controller output can comprise that M deducts K pwm signal output and K low and high level logical signal output, and K is the positive integer that is less than M.Low and high level logical signal output is for exporting low and high level logical signal Sx.This low and high level logical signal Sx is produced by the general Purpose IO Interface (General Purpose IO Ports, GPIO) of digitial controller, can be common acyclic logical signal, can be for example a lasting high level signal.Due to low and high level logical signal Sx effective control signal not necessarily, therefore need to using low and high level logical signal and pwm signal by with Men Xiangyu after a pwm signal of generation as effective control signal.Please refer to Fig. 6, the low and high level logical signal of any low and high level logical signal output output can with the pwm signal of a pwm signal output output by with Men Xiangyu after produce in addition a pwm signal.Digitial controller can determine according to the size of load current signal the number of the signal output part of the effective control signal of output.
In concrete application: when the number P that exports the signal output part of effective control signal at needs is less than M and subtracts K, 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 is greater than M and subtracts K, 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 low and high level logical signal output output low and high level logical signal by P, this P subtract (M subtracts K) individual low and high 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 low and high level logical signal S1, S2......Sk, this K low and high level logical signal respectively with M subtract one or more pwm signals in K pwm signal by with Men Xiangyu after produce K pwm signal, thereby finally export M pwm signal PWM1, PWM2......PWMm, to control N synchronous rectifier all-pass.
When load current signal reduces, can reduce the number of the signal output part of the effective Sx signal of output, by several Sx signals being set to zero, can realize part conducting in N synchronous rectifier, be that zero synchronous rectifier corresponding to Sx signal 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 digitial controller output low and high level logical signal Sx specific output pwm signal is more easily realized, thereby in the present embodiment digitial controller by the K by output low and high level logical signal Sx and pwm signal phase with after produce again the scheme of K pwm signal, scheme with respect to last embodiment more easily realizes, can alleviate the load of digitial controller, reduce the complexity of digitial controller.
The embodiment of the present invention also provides a kind of Switching Power Supply, comprising: N synchronous rectifier in parallel and for driving and control the Drive and Control Circuit of the synchronous rectifier of N parallel connection, and N is positive integer;
This Drive and Control Circuit has input for obtaining load current signal and for M output of output drive signal, M is greater than 1 but be not more than the positive integer of N, M output is connected with the driving stage of the synchronous rectifier of N parallel connection, 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 driving signal that Drive and Control Circuit is exported according to size adjustment M output of load current signal, to control N all or part of conducting of synchronous rectifier in parallel.
Wherein, Drive and Control Circuit can determine that according to the size of load current signal output effectively drives the number of the output of signal, thereby controls the number of the synchronous rectifier of conducting.
Further, when load current signal increases, Drive and Control Circuit can increase output and effectively drive the number of the output of signal; When load current signal reduces, Drive and Control Circuit can reduce output and effectively drive the number of the output of signal.
Further, Drive and Control Circuit can comprise: the drive circuit that the synchronous rectifier in parallel with N is connected, and the control circuit be connected with drive circuit;
Control circuit, comprise for obtaining the input of load current signal, also comprises M the signal output part for exporting control signal, and this control circuit determines the number of the signal output part of the effective control signal of output for the size according to load current signal;
Drive circuit, comprise M the output for output drive signal, also comprises M the signal input part be connected with M signal output part of control circuit, and this drive circuit is for amplifying to produce the driving signal by control signal.
The Switching Power Supply that the embodiment of the present invention provides, can adjust the number of the synchronous rectifier of conducting according to the variation self adaptation of load, realize the part conducting of synchronous rectifier, thereby raise the efficiency.
Drive and Control Circuit and the Switching Power Supply of the above shunt-wound synchronous rectification tubes that the embodiment of the present invention is provided are described in detail, having applied specific case herein sets forth principle of the present invention and execution mode, the explanation of above embodiment is just understood method of the present invention and core concept thereof for helping, and should not be construed as limitation of the present invention.
Claims (2)
1. the Drive and Control Circuit of a shunt-wound synchronous rectification tubes, for driving and control the synchronous rectifier of N parallel connection, N is greater than 2 positive integer, it is characterized in that:
This Drive and Control Circuit has input for obtaining load current signal and for M output of output drive signal, M is greater than 1 but be less than the positive integer of N, the driving stage of the synchronous rectifier that a described M output is in parallel with described N is connected, 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 driving 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, to control the number of described N synchronous rectifier conducting in parallel, when described load current signal increases, described Drive and Control Circuit increases output and effectively drives the number of the output of signal, when described load current signal reduces, described Drive and Control Circuit reduces output and effectively drives the number of the output of signal,
Described Drive and Control Circuit comprises: the drive circuit that the synchronous rectifier in parallel with described N is connected, and the control circuit be connected with described drive circuit; Described control circuit, comprise described for obtaining the input of load current signal, also comprise M the signal output part for exporting control signal, this control circuit determines the number of the signal output part of the effective control signal of output for the size according to described load current signal; Described drive circuit, comprise the described M for an output drive signal output, also comprises M the signal input part be connected with M signal output part of described control circuit, and this drive circuit is for amplifying to produce the driving signal by described control signal;
Described control circuit is digitial controller, and the control signal of the signal output part output of described digitial controller comprises: pulse width modulation (PWM) signal, or low and high level logical signal; A described M signal output part comprises that M deducts K pwm signal output and K low and high level logical signal output, K is the positive integer that is less than M, wherein, the low and high level logical signal of any low and high level logical signal output output can with pwm signal by with Men Xiangyu after produce in addition a pwm signal.
2. a Switching Power Supply comprises: N synchronous rectifier in parallel and for driving and control the Drive and Control Circuit of the synchronous rectifier of described N parallel connection, and N is greater than 2 positive integer, it is characterized in that:
Described Drive and Control Circuit has input for obtaining load current signal and for M output of output drive signal, M is greater than 1 but be less than the positive integer of N, the driving stage of the synchronous rectifier that a described M output is in parallel with described N is connected, 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 driving 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, to control the number of described N synchronous rectifier conducting in parallel, when described load current signal increases, described Drive and Control Circuit increases output and effectively drives the number of the output of signal, when described load current signal reduces, described Drive and Control Circuit reduces output and effectively drives the number of the output of signal,
Described Drive and Control Circuit comprises: the drive circuit that the synchronous rectifier in parallel with described N is connected, and the control circuit be connected with described drive circuit; Described control circuit, comprise described for obtaining the input of load current signal, also comprise M the signal output part for exporting control signal, this control circuit determines the number of the signal output part of the effective control signal of output for the size according to described load current signal; Described drive circuit, comprise the described M for an output drive signal output, also comprises M the signal input part be connected with M signal output part of described control circuit, and this drive circuit is for amplifying to produce the driving signal by described control signal;
Described control circuit is digitial controller, and the control signal of the signal output part output of described digitial controller comprises: pulse width modulation (PWM) signal, or low and high level logical signal; A described M signal output part comprises that M deducts K pwm signal output and K low and high level logical signal output, K is the positive integer that is less than M, wherein, the low and high level logical signal of any low and high level logical signal output output can with pwm signal by with Men Xiangyu after produce in addition a pwm signal.
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| CN201110036242.2A CN102097924B (en) | 2011-02-11 | 2011-02-11 | Drive control circuit for shunt-wound synchronous rectification tubes and switching power supply |
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| CN201110036242.2A CN102097924B (en) | 2011-02-11 | 2011-02-11 | Drive control circuit for shunt-wound synchronous rectification tubes and switching power supply |
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| CN103944390A (en) * | 2013-01-23 | 2014-07-23 | 无锡华润上华半导体有限公司 | Switching power supply and control method thereof |
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| CN104218778A (en) * | 2013-05-30 | 2014-12-17 | 华硕电脑股份有限公司 | A power switch and a drive IC thereof on an electronic device |
| TWI556203B (en) * | 2015-01-30 | 2016-11-01 | 友達光電股份有限公司 | Display device and converter control method |
| 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 |
| 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 |
| CN111384854A (en) * | 2018-12-29 | 2020-07-07 | 中兴通讯股份有限公司 | Switching circuit and switching power supply |
| CN110912410B (en) * | 2019-11-22 | 2023-08-18 | 深圳南云微电子有限公司 | Light load detection and power tube partial conduction control method and circuit |
| 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 |
| 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 |
| CN116886087B (en) * | 2023-07-31 | 2024-02-02 | 北京中科格励微科技有限公司 | Switching circuit for reducing load radiation |
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