CN212752132U - Synchronous rectification control circuit and switching power supply - Google Patents
Synchronous rectification control circuit and switching power supply Download PDFInfo
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Abstract
The utility model discloses a synchronous rectification control circuit and switching power supply, through the grid source voltage value before the turn-off of signal conditioning circuit control synchronous rectifier tube, the drop-down signal that signal conditioning circuit provided begins to reduce promptly when grid source voltage drops to a certain default, makes synchronous rectifier tube's grid source voltage is unlikely to reach near turn-off voltage value fast to the drain-source voltage of control synchronous rectifier tube maintains near first threshold voltage, can reach switching power supply loss and reduce, the beneficial effect that system efficiency improves.
Description
Technical Field
The utility model relates to a switching power supply field, more specifically say, relate to a synchronous rectification control circuit and switching power supply.
Background
In a switching power supply circuit, in order to improve the conversion efficiency of a switching power supply, a synchronous rectification switching tube is usually used to replace a rectification diode, as shown in fig. 1, a schematic block diagram of a flyback switching power supply is shown, a rectification switching tube M2 is used to replace a diode on a secondary side, and the flyback switching power supply further includes an isolation transformer T, a primary side main switching tube M1, an input capacitor C1 and an output capacitor C2.
In the working process of the flyback switching power supply, in order to switch off the rectifier tube M2 as soon as possible to realize a continuous working mode (CCM) of the switching power supply, a control method is usually adopted in which a pull-down current source is connected to the gate of the rectifier tube M2, as shown in fig. 1 as I1, when it is detected that the voltage drop across the drain and source of the rectifier tube M2 touches a preset first threshold voltage Vth1, the gate-source voltage of the rectifier tube M2 is pulled down by the current source I1, and the voltage across the gate and source is reduced accordingly; when the voltage drop across the drain and the source of the rectifier M2 is detected to touch the second threshold voltage Vth2, the voltage across the gate and the source is rapidly pulled down to rapidly turn off the synchronous rectifier M2.
In the pull-down process of the pull-down current source I1 in the prior art, a constant pull-down current value is adopted, so that when a voltage drop across the drain and the source of the synchronous rectifier tube M2 touches a preset first threshold voltage Vth1, a gate-source voltage is easily pulled down to a turn-off threshold voltage or a vicinity of the turn-off threshold voltage of the synchronous rectifier tube M2 by a larger pull-down current value, so that an on-resistance of the synchronous rectifier tube M2 is larger, thereby increasing a loss of the synchronous rectifier tube M2 and hardly achieving a purpose of improving efficiency.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a synchronous rectification control circuit and a switching power supply to solve the technical problems of large loss and low efficiency of the synchronous rectification switch tube existing in the prior art.
The technical solution of the utility model is a synchronous rectification control circuit for synchronous rectifier tube in the control switching power supply, it includes signal conditioning circuit, signal conditioning circuit detects the drain-source both ends voltage of synchronous rectifier tube is detected when detecting the drain-source both ends voltage more than or equal to first threshold voltage of synchronous rectifier tube, signal conditioning circuit output drop-down signal extremely the grid of synchronous rectifier tube is in order to adjust the grid source voltage of synchronous rectifier tube, thereby make the drain-source both ends voltage of synchronous rectifier tube maintains near first threshold voltage, wherein, works as when the grid source voltage of synchronous rectifier tube falls down to predetermined magnitude of voltage, then control drop-down signal reduces.
Preferably, when it is detected that the voltage across the drain and the source of the synchronous rectifier tube is equal to a first threshold voltage, the gate-source voltage value of the synchronous rectifier tube is recorded as a first voltage value, and the predetermined voltage value is equal to or less than the first voltage value.
Preferably, the value of the first threshold voltage is set to a certain voltage value before the synchronous rectifier tube reaches the turn-off state.
Preferably, the predetermined voltage value is greater than an intrinsic voltage value, which is somewhere between 0.5V and 1V.
Preferably, the signal conditioning circuit includes a detection circuit and a pull-down circuit, the detection circuit is used for detecting the voltage across the drain and the source of the synchronous rectifier tube, so as to output a switching signal to control the pull-down circuit to start the pull-down process,
the pull-down circuit receives the switching signal, and when the switching signal is in an effective state, the pull-down circuit outputs the pull-down signal to the grid electrode of the synchronous rectifying tube.
Preferably, the pull-down circuit includes a pull-down current source and a pull-down resistor, the pull-down current source and the pull-down resistor are connected in series between the gate and the source of the synchronous rectifier, and a current signal of the pull-down current source is used as the pull-down signal.
Preferably, the pull-down circuit further includes a first switch tube, the first switch tube is connected in parallel to two ends of the pull-down resistor, the first switch tube controls the switching state thereof through a comparison circuit, the comparison circuit receives the gate-source voltage of the synchronous rectifier tube and a first comparison threshold, the signal after the comparison operation controls the switching state of the first switch tube,
wherein the first comparison threshold is less than the first voltage value.
Preferably, the pull-down circuit comprises a pull-down current source and a plurality of pull-down resistors, the plurality of pull-down resistors are connected in series or in parallel or in series and parallel to form a pull-down resistor assembly, the pull-down current source is connected in series with the pull-down resistor assembly, each resistor in the pull-down resistor assembly is respectively connected in parallel with a second switching tube,
the pull-down current source and the pull-down resistor component are connected between the grid and the source of the synchronous rectifier tube, and an output signal of the pull-down current source serves as the pull-down signal.
Preferably, the plurality of second switching tubes control the switching state thereof through a corresponding plurality of comparison circuits,
one receiving end of each comparison circuit in the comparison circuits receives the grid-source voltage of the synchronous rectifier tube, the other receiving end of each comparison circuit receives a plurality of comparison threshold voltages respectively, signals after comparison operation serve as output switch signals to correspondingly control the second switch tubes, and the comparison threshold voltages are smaller than the first voltage value.
Preferably, the pull-down circuit is a variable current source, the variable current source is connected between the gate and the source of the synchronous rectifier, an output signal of the variable current source is used as the pull-down signal, and the variable current source receives a trigger signal to reduce the pull-down signal according to the trigger signal.
A switching power supply comprises a primary side main power switching tube, a secondary side synchronous rectifier tube and the synchronous rectification control circuit, wherein the synchronous rectification control circuit is used for controlling the secondary side synchronous rectifier tube.
Adopt the utility model discloses a synchronous rectification control circuit structure, through the grid source voltage value of signal conditioning circuit control before synchronous rectifier tube turn-offs, the drop-down signal that signal conditioning circuit provided begins to reduce promptly when grid source voltage drops to a certain default, makes synchronous rectifier tube's grid source voltage is unlikely to reach near shutoff threshold value fast to the drain-source voltage of control synchronous rectifier tube maintains near first threshold voltage, so can reach switching power supply loss and reduce, the beneficial effect that system efficiency improves.
Drawings
FIG. 1 is a schematic diagram of a synchronous rectification control circuit in a prior art switching power supply;
fig. 2 is a block diagram of a synchronous rectification control circuit according to the present invention;
fig. 3 is a circuit diagram of a first embodiment of a signal conditioning circuit according to the present invention;
FIG. 3-1 is a diagram of a pull-down current waveform according to an embodiment of the signal conditioning circuit of FIG. 2;
FIG. 3-2 is a waveform diagram illustrating the operation of a synchronous rectifier according to the present invention;
fig. 4 is a circuit diagram of a second embodiment of a signal conditioning circuit according to the present invention;
FIG. 4-1 is a diagram of a pull-down current waveform according to an embodiment of the signal conditioning circuit of FIG. 3;
fig. 5 is a circuit diagram of a third embodiment of a signal conditioning circuit according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.
Referring to fig. 2, fig. 3-1, and fig. 3-2, there are shown a block diagram, a structure diagram of a first embodiment, and a corresponding waveform diagram of a synchronous rectification control circuit according to the present invention; the synchronous rectification control circuit is used for controlling a synchronous rectification tube in a switching power supply, for example, a flyback switching power supply is taken as an example in fig. 2, and a basic frame structure of the flyback switching power supply is already described in the background art and will not be repeated here.
Referring to fig. 2, in the embodiment of the present invention, the synchronous rectification control circuit includes a signal conditioning circuit 1 the signal conditioning circuit 1 detects the drain-source voltage V of the synchronous rectifier tubeDSWhen the voltage V at the two ends of the drain and the source of the synchronous rectifier tube is detectedDSGreater than or equal to a preset first threshold voltage Vth1, the signal conditioning circuit 1 outputs a pull-down signal IGSTo the gate of a synchronous rectifier M2 to adjust the gate-source voltage V of the synchronous rectifierGSThereby enabling the voltage V between the drain and the source of the synchronous rectifier tubeDSAnd the voltage is maintained around the first threshold voltage, wherein the pull-down signal is controlled to decrease when the gate-source voltage of the synchronous rectifier tube decreases to a predetermined voltage value Vy, where the predetermined voltage value is set according to the circuit requirements, and the source of the synchronous rectifier tube M2 is a ground terminal, which are the same below.
Specifically, referring to fig. 3 as a first implementation manner of the signal conditioning circuit 1 in fig. 2, the signal conditioning circuit 1 includes a detection circuit 1-1 and a pull-down circuit 1-2, where the detection circuit 1-1 is used to detect a voltage V across a drain and a source of the synchronous rectifier tubeDSAnd also receives a preset first threshold voltage Vth1 to control the pull-down circuit 1-2 to output the pull-down signal by outputting a switching signal Vf, the detection circuit 1-1 may be composed of a sampling circuit and a comparator, or may be implemented by a circuit with the same function, and is not limited herein. The pull-down circuit 1-2 receives the switching signal Vf outputted from the detection circuit 1-1, where the pull-down circuit 1-2 includes a pull-down current source and a pull-down resistor R1 connected in series. As shown in fig. 3, the pull-down current source may be formed by a field effect transistor Q, a drain of the field effect transistor Q is connected to a gate of the synchronous rectifier M2, the pull-down resistor R1 is connected in series with the field effect transistor Q between the synchronous rectifier and a source (i.e., a ground), an output signal of the pull-down current source is used as the pull-down signal, and here, the pull-down signal is a gate-source current signal I of the synchronous rectifier M2 according to a circuit structureGSThe pull-down current source implementation is not so limited.
It is explicated that need supplement, in the embodiment of the utility model, when detecting when the drain-source both ends voltage of synchronous rectifier tube equals predetermined first threshold voltage, the grid source voltage value of synchronous rectifier tube is marked as first voltage value, it is for less than or equal to predetermine voltage value Vy first voltage value Vc.
The predetermined voltage value Vy is greater than an intrinsic voltage value Vg, which is empirically a voltage value typically between 0.5V and 1V. In the above implementation of using the field effect transistor as the current source, the drain terminal of the field effect transistor receives the gate source voltage of the synchronous rectifier M2, and according to the output characteristic of the transistor, when the gate source voltage of the field effect transistor starts to decrease to a certain value, i.e. the intrinsic voltage value, the current value of the transistor starts to decrease, therefore, the embodiment of the present invention actively sets the predetermined voltage value, e.g. to be greater than the intrinsic voltage value, so as to achieve the effect of reducing the pull-down signal in advance.
The preset first threshold voltage Vth1 is set to be a voltage value before the synchronous rectifier M2 is turned off, for example, the drain-source voltage when the synchronous rectifier M2 is turned off is-10 mv, and then the first threshold voltage Vth1 is set to be a value between-60 mv and-40 mv.
Referring to fig. 3-1 and 3-2, in fig. 3-2, at time t2, the synchronous rectifier M2 on the secondary side is turned on, and the detection circuit 1-1 detects the voltage V across the drain and the source of the synchronous rectifierDSAt time t3, when the voltage V across the drain and the source is detectedDSWhen the voltage reaches the first threshold voltage Vth1, the detection circuit outputs a switching signal Vf to control the field effect transistor Q to be turned on, and the pull-down circuit performs pull-down processing on the gate voltage of the synchronous rectifier tube M2. Specifically, when the detection circuit 1-1 detects the voltage V between the drain and the source of the synchronous rectifier tubeDSWhen the first threshold voltage Vth1 is reached, the gate-source voltage of the synchronous rectifier is recorded as the first voltage (i.e. the preset voltage in this embodiment), corresponding to point c in fig. 3-1, and the pull-down signal I is then assertedGSStarting to decrease (the solid line in fig. 3-1 corresponds to the current waveform diagram of the present embodiment, and the dotted line is the current waveform diagram of the prior art), in the time period between t3 and t4, since the pull-down signal is gradually decreasing, the gate-source voltage of the synchronous rectifier M2 is not rapidly pulled down to the vicinity of the turn-off threshold, so the on-resistance of the synchronous rectifier will not increase rapidly, and the drain-source voltage V of the synchronous rectifier will not increase rapidlyDSMay be maintained near the first threshold voltage.
As shown in fig. 3-2, the prior art if in the process of pulling down a synchronous rectifier tubeWhen the pull-down current is larger, the gate-source voltage V of the synchronous rectifier tubeGSThe drop is very fast, as the dotted line in FIG. 3-2, resulting in a large on-resistance of the synchronous rectifier and a drain-source voltage V of the synchronous rectifierDSThe reduction is also large, the system power loss is large, the efficiency is low, and the scheme of the utility model is adopted, the grid source voltage V of the synchronous rectifier tubeGSDuring the falling process, the current I is pulled downGSWith the gate-source voltage VGSThe grid source voltage V of the synchronous rectifier M2 is controlled in a gradually decreasing trendGSThe reduction speed of the device is beneficial to reducing loss and improving efficiency.
Referring to fig. 4, a circuit diagram of a second embodiment of a signal conditioning circuit according to the present invention, for some synchronous rectifiers, the on-resistance of the synchronous rectifiers does not change or changes insignificantly during the initial period of the gate-source voltage drop, and there is no need to control the pull-down current to decrease during this initial period. Therefore, on the basis of the first embodiment, the pull-down circuit in this embodiment adds the first switch tube S1, and other structures of the signal conditioning circuit are the same as those of the previous embodiment, and are not repeated here.
The first switch tube S1 is connected in parallel to two ends of the pull-down resistor R1, the first switch tube S1 controls its switch state through a comparison circuit, the comparison circuit receives the gate-source voltage V of the synchronous rectifier tubeGSAnd a first comparison threshold Ve, wherein the signal after comparison operation controls the switching state of the first switching tube, the first comparison threshold Ve is smaller than the preset voltage value Vy, and the comparison circuit can be realized by a comparator. FIG. 4-1 is a waveform diagram of a pull-down current according to an embodiment of the signal conditioning circuit of FIG. 3, and in conjunction with FIG. 4-1, the pull-down signal I is controlled during an early stage of the falling of the synchronous rectifier M2, e.g., during a period from point c to point bGSThe first switch tube S1 is controlled to be turned on, and when the synchronous rectifier M2 falls to the first comparison threshold Ve, that is, b', the first switch tube S1 is controlled to be turned off, so that the pull-down signal I is pulled downGSThen following the gate-source voltage V of the synchronous rectifierGSIs reduced. The embodiment can also achieve the purposes of low circuit loss and high efficiency, and simultaneously can also take into account the characteristics of different synchronous rectifying tubes to preventThe synchronous rectifier is turned off in advance.
Referring to fig. 5, the circuit diagram of a third embodiment of the signal conditioning circuit according to the present invention is an embodiment of the present invention, wherein the signal conditioning circuit includes a detection circuit 1-1 and a pull-down circuit 1-2, wherein the detection circuit 1-1 is the same as the first embodiment, except that the pull-down circuit 1-2 includes a pull-down current source (taking a transistor Q as an example) and a plurality of pull-down resistors R1-Rn connected in series, and the plurality of pull-down resistors R1-Rn connected in series can form a pull-down resistor assembly, and the present embodiment takes a series as an example, and those skilled in the art will know that the plurality of pull-down resistors R1-Rn can also be connected in parallel or in series-parallel to form a pull-down resistor assembly, and the pull-down current source is connected in series with the pull-down resistor assembly. The pull-down current source is connected in series with the pull-down resistors connected in series, each resistor in the pull-down resistors connected in series is connected in parallel with a second switching tube S1-Sn, the pull-down current source and the pull-down resistors connected in series are connected between the switching circuit and the ground, an output signal of the pull-down current source is used as the pull-down signal Id, and the pull-down current source receives an adjusting voltage signal VTWhen the adjustment voltage signal reaches the intrinsic voltage value, the current value of the pull-down current source starts to decrease, and the pull-down current sources are the same as those in the first embodiment and will not be repeated.
The second switching tubes S1-Sn are controlled by a plurality of corresponding comparison circuits (e.g. comparison circuits 1-n in fig. 5), and one receiving end of each comparison circuit in the plurality of comparison circuits receives the gate-source voltage V of the synchronous rectifier tubeGSThe other receiving terminals of the plurality of comparison circuits respectively receive a plurality of comparison threshold voltages Ve1-Ven, and the signals after comparison operation are used as output signals Vs1-Vsn to correspondingly control the plurality of second switching tubes, wherein the plurality of comparison threshold voltages are smaller than the first voltage value, and the plurality of comparison circuits can be implemented by comparators and other devices.
In this embodiment, one or more of the second switching tubes S1-Sn may be turned off at different time periods according to the gate-source voltage requirement of the synchronous rectifier tube M2, so as to control the reduction of the pull-down current at different time points, and achieve the purpose of controlling the gate-source voltage of the synchronous rectifier tube M2 according to the requirement.
Finally, on the basis of the first embodiment, the pull-down circuit may further be a variable current source, the variable current source is connected between the gate and the source of the synchronous rectifier, an output signal of the variable current source is used as the pull-down signal, and the variable current source receives a trigger signal to reduce the pull-down signal according to the trigger signal. For example, when the gate-source voltage of the synchronous rectifier tube drops to a predetermined voltage value Vy, a trigger signal may be generated by a comparator, and the trigger signal is transmitted to the variable current source.
In a second aspect, the utility model discloses a switching power supply, including former limit main power switch tube and vice limit synchronous rectifier tube, still include foretell synchronous rectification control circuit, synchronous rectification control circuit is used for control vice limit synchronous rectifier tube.
It is understood by those skilled in the art that the specific structure of the pull-down circuit is not limited thereto, as long as the function of starting to decrease the pull-down signal of the pull-down circuit when the gate-source voltage of the synchronous rectifier tube reaches a predetermined voltage value can be achieved, and all that is within the scope of the present invention.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A synchronous rectification control circuit for controlling a synchronous rectification tube in a switching power supply is characterized by comprising
A signal adjusting circuit, wherein the signal adjusting circuit detects the voltage across the drain and the source of the synchronous rectifier tube, when the voltage across the drain and the source of the synchronous rectifier tube is detected to be larger than or equal to a first threshold voltage, the signal adjusting circuit outputs a pull-down signal to the grid electrode of the synchronous rectifier tube to adjust the grid source voltage of the synchronous rectifier tube, so that the voltage across the drain and the source of the synchronous rectifier tube is maintained near the first threshold voltage,
when the grid source voltage of the synchronous rectifier tube is reduced to a preset voltage value, the pull-down signal is controlled to be reduced.
2. The control circuit of claim 1, wherein when the voltage across the drain and the source of the synchronous rectifier is detected to be equal to a first threshold voltage, the gate-source voltage value of the synchronous rectifier is recorded as a first voltage value, and the predetermined voltage value is equal to or less than the first voltage value.
3. The control circuit of claim 2, wherein the first threshold voltage has a value set to a voltage value before the synchronous rectifier tube reaches a turn-off.
4. The control circuit of claim 2, wherein the predetermined voltage value is greater than an intrinsic voltage value, the intrinsic voltage value being somewhere between 0.5V and 1V.
5. The control circuit of any of claims 2-4, wherein the signal conditioning circuit comprises a detection circuit and a pull-down circuit,
the detection circuit is used for detecting the voltage at two ends of the drain source of the synchronous rectifier tube so as to output a switching signal to control the pull-down circuit to start pull-down processing,
the pull-down circuit receives the switching signal, and when the switching signal is in an effective state, the pull-down circuit outputs the pull-down signal to the grid electrode of the synchronous rectifying tube.
6. The control circuit of claim 5, wherein the pull-down circuit comprises a pull-down current source and a pull-down resistor,
the pull-down current source and the pull-down resistor are connected in series between the grid and the source of the synchronous rectifier tube, and a current signal of the pull-down current source is used as the pull-down signal.
7. The control circuit of claim 6, wherein the pull-down circuit further comprises a first switch tube connected in parallel across the pull-down resistor,
the first switch tube controls the switch state of the first switch tube through a comparison circuit, the comparison circuit receives the grid-source voltage of the synchronous rectifier tube and a first comparison threshold value, the switch state of the first switch tube is controlled by a signal after comparison operation,
wherein the first comparison threshold is less than the first voltage value.
8. The control circuit of claim 5, wherein the pull-down circuit comprises a pull-down current source and a plurality of pull-down resistors,
the pull-down resistors are connected in series or in parallel or in series and parallel to form a pull-down resistor assembly, the pull-down current source is connected in series with the pull-down resistor assembly, each resistor in the pull-down resistor assembly is respectively connected with a second switch tube in parallel,
the pull-down current source and the pull-down resistor component are connected between the grid and the source of the synchronous rectifier tube, and an output signal of the pull-down current source serves as the pull-down signal.
9. The control circuit of claim 8, wherein the plurality of second switching tubes are controlled to switch states by a corresponding plurality of comparison circuits,
one receiving end of each comparison circuit in the comparison circuits receives the grid-source voltage of the synchronous rectifier tube, the other receiving end of each comparison circuit receives a plurality of comparison threshold voltages respectively, signals after comparison operation serve as output switch signals to correspondingly control the second switch tubes, and the comparison threshold voltages are smaller than the first voltage value.
10. A switching power supply comprising a primary side main power switching tube and a secondary side synchronous rectifier tube, further comprising a synchronous rectification control circuit as claimed in any one of claims 1 to 9 for controlling said secondary side synchronous rectifier tube.
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| CN202021182583.1U CN212752132U (en) | 2020-06-23 | 2020-06-23 | Synchronous rectification control circuit and switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113746360A (en) * | 2021-09-27 | 2021-12-03 | 江苏慧易芯科技有限公司 | Synchronous rectification driving voltage regulating circuit, system and regulating method |
| CN114884379A (en) * | 2022-06-13 | 2022-08-09 | 成都利普芯微电子有限公司 | Synchronous rectification control circuit, switching power supply and chip |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113746360A (en) * | 2021-09-27 | 2021-12-03 | 江苏慧易芯科技有限公司 | Synchronous rectification driving voltage regulating circuit, system and regulating method |
| CN113746360B (en) * | 2021-09-27 | 2022-08-02 | 江苏慧易芯科技有限公司 | Synchronous rectification driving voltage regulating circuit, system and regulating method |
| CN114884379A (en) * | 2022-06-13 | 2022-08-09 | 成都利普芯微电子有限公司 | Synchronous rectification control circuit, switching power supply and chip |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |