CN211830730U - Darlington driving circuit and chip for flyback power supply - Google Patents
Darlington driving circuit and chip for flyback power supply Download PDFInfo
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- CN211830730U CN211830730U CN202020359562.6U CN202020359562U CN211830730U CN 211830730 U CN211830730 U CN 211830730U CN 202020359562 U CN202020359562 U CN 202020359562U CN 211830730 U CN211830730 U CN 211830730U
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Abstract
The utility model discloses a darlington drive circuit and chip for flyback power supply, darlington drive circuit includes: the detection module, the drive module, a control module, the drive module includes first switch element, the second switch element, the third switch element, three switch element provides the output of being connected respectively with two level drive feet of darlington pipe jointly, when darlington pipe is opened to needs, utilize first switch element output triode switch-on signal to realize, when darlington pipe is closed to needs, utilize second switch element and third switch element output triode shut-off signal to realize, so the utility model discloses can realize the drive to darlington pipe, because the triode shut-off signal is all received to the two-stage triode moreover, so can close the darlington pipe rapidly.
Description
Technical Field
The utility model relates to a power field especially relates to a darlington drive circuit and chip for flyback power supply.
Background
Referring to fig. 1, in the conventional flyback power supply, an NPN transistor is used as a switching transistor Q1, a driving chip performs sampling detection on current flowing through a resistor Rcs and voltage of the resistor Rcs through a detection module and sends the sampled detection to a control module, the control module controls the on and off of Q1 through a Base driving module according to the fed-back current and voltage, the driving chip only has one Base to drive and output Base, and the driving chip cannot drive the darlington NPN.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a darlington drive circuit and chip for flyback power supply is provided.
The utility model provides a technical scheme that its technical problem adopted is: constructing a darlington drive circuit for a flyback power supply, for use in a flyback power supply, the drive circuit comprising: the device comprises a detection module for sampling the voltage of the output end of a Darlington tube, a driving module, a control module for controlling the driving module to open or close the Darlington tube according to the sampling voltage, and the driving module comprises:
the first switch unit is connected with the control module in input and outputs a first-stage driving pin for connecting the Darlington tube, and the first switch unit is used for outputting a triode conducting signal capable of conducting a first-stage triode of the Darlington tube when the first switch unit is turned on;
the second switch unit is connected with the control module in input and outputs a first-stage driving pin for connecting the Darlington tube, and the second switch unit is used for outputting a triode closing signal which can close a first-stage triode of the Darlington tube when the second switch unit is opened;
the third switch unit is input to the control module and outputs a second-stage driving pin used for being connected with the Darlington tube, and the third switch unit is used for outputting a triode closing signal capable of closing a second-stage triode of the Darlington tube when the third switch unit is opened;
when the Darlington tube needs to be opened, the control module opens the first switch unit and closes the second switch unit and the third switch unit; and when the Darlington tube needs to be closed, closing the first switch unit, and opening the second switch unit and the third switch unit.
Preferably, the first switch unit comprises a constant current source and a first switch tube, the input of the first switch tube is connected with the constant current source, the output of the first switch tube is used for connecting a first-stage driving pin of the darlington tube, and the control end of the first switch tube is connected with the control module.
Preferably, the second switch unit includes a second switch tube, an input of the second switch tube is grounded, an output of the second switch tube is used for connecting a first-stage driving pin of the darlington tube, and a control end of the second switch tube is connected to the control module.
Preferably, the third switching unit comprises a third switching tube, the input of the third switching tube is connected with a voltage capable of closing the third switching tube, the output of the third switching tube is used for connecting a second stage driving pin of the darlington tube, and the control end of the third switching tube is connected with the control module.
The utility model discloses another aspect has still constructed a darlington driver chip for flyback power supply, include:
a darlington drive circuit as claimed in any preceding claim;
a sampling end;
a ground terminal;
the first-stage driving end is simultaneously connected with the output of the first switch unit and the output of the second switch unit and is used for being connected with a first-stage driving pin of the Darlington tube;
and the second-stage driving end is connected with the output of the third switch unit and is used for being connected to a second-stage driving pin of the Darlington tube.
The utility model discloses a darlington drive circuit and chip for flyback power supply has following beneficial effect: the utility model discloses an in the circuit, have three switch unit, provide the output of being connected respectively with two level drive feet of darlington pipe jointly, when darlington pipe is opened to needs, utilize first switch unit output triode turn-on signal to realize, when darlington pipe is closed to needs, utilize second switch unit and third switch unit output triode turn-off signal to realize, so the utility model discloses can realize the drive to darlington pipe, because the triode turn-off signal is all received to the two-stage triode moreover, so can close the darlington pipe rapidly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:
FIG. 1 is a schematic diagram of a prior art flyback power supply;
fig. 2 is a schematic diagram of a darlington driving circuit for a flyback power supply according to the present invention;
fig. 3 is a schematic diagram of the darlington driving circuit for a flyback power supply of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Exemplary embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the embodiments and specific features in the embodiments of the present invention are described in detail in the present application, but not limited to the present application, and the technical features in the embodiments and specific features in the embodiments of the present invention can be combined with each other without conflict.
It is noted that "connected" or "connecting" does not include directly connecting two entities, but also indirectly connecting two entities through other entities with beneficial and improved effects. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. These terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, a first component may be named as a second component, and similarly, a second component may also be named as a first component, without departing from the scope of the present invention.
Referring to fig. 2, the present invention provides a darlington driving circuit 100 for a flyback power supply, for driving a darlington tube 1 in the flyback power supply. It is understood that the darlington driving circuit 100 of the present invention can also be made into a chip product.
The Darlington tube 1 is formed by connecting two stages of triodes in series, and the triodes can be NPN type or PNP type. In the following, two NPN transistors are taken as an example, and as shown in the drawing, an NPN first-stage transistor Q1 and an NPN second-stage transistor Q2 are connected in series. The input of the Darlington tube 1 is connected with the output of the transformer, the output of the Darlington tube 1 is grounded through the sampling resistor Rcs, and the feedback control of the current flowing through the resistor Rcs can be realized by detecting the voltage on the resistor Rcs.
The utility model discloses a drive circuit 100 is including connecting gradually: a detection module 110, a driving module, and a control module 120. The detection module 110 is configured to detect a current flowing through the darlington tube 1 and generate a corresponding sampling voltage, and a sampling terminal CS in the drawing represents an input of the detection module 110, which is the same as that in the prior art and is not described herein again. The control module 120 is configured to control the driving module to open or close the darlington tube 1 according to the sampling voltage. The driving module in this embodiment includes a first switching unit 131, a second switching unit 132, and a third switching unit 133.
The input of the first switch unit 131 is connected to the control module 120, and the output of the first switch unit 131 is used for connecting a first-stage driving pin of the darlington tube 1, the first switch unit 131 is used for outputting a triode conduction signal which can enable a first-stage triode of the darlington tube 1 to be conducted when the first switch unit 131 is turned on, and no signal is output when the first switch unit 131 is turned off.
The input of the second switch unit 132 is connected to the control module 120, and the output of the second switch unit 132 is used for connecting the first-stage driving pin of the darlington tube 1, the second switch unit 132 is used for outputting a transistor turn-off signal which can turn off the first-stage transistor of the darlington tube 1 when the second switch unit 132 is turned on, and no signal is output when the second switch unit 132 is turned off.
The third switching unit 133 is input to the control module 120 and outputs a second stage driving pin for connecting the darlington tube 1, the third switching unit 133 is configured to output a transistor turn-off signal for turning off a second stage transistor of the darlington tube 1 when the third switching unit 133 is turned on, and no signal is output when the third switching unit 133 is turned off.
When the darlington tube 1 needs to be opened, the control module 120 turns on the first switch unit 131 and turns off the second switch unit 132 and the third switch unit 133. Specifically, when the sampling voltage is smaller than a first reference value, the control module 120 turns on the first switching unit 131, and turns off the second switching unit 132 and the third switching unit 133.
When the darlington tube 1 needs to be closed, the control module 120 closes the first switch unit 131 and opens the second switch unit 132 and the third switch unit 133. Preferably, the control module 120 turns off the first switching unit 131 when the sampling voltage is greater than a first reference value; the control module 120 controls the second switching unit 132 and the third switching unit 133 when the sampled voltage reaches a second reference value. Wherein the first reference value is less than or equal to the second reference value.
More specifically, in a specific embodiment, the first switch unit 131 includes a constant current source and a first switch tube, the second switch unit 132 includes a second switch tube, and the third switch unit 133 includes a third switch tube. The input of first switch tube is connected the constant current source, the output of first switch tube is used for connecting the first order drive foot of darlington pipe 1, the control end of first switch tube is connected control module 120. The input of the second switch tube is connected to the voltage that can turn off the second switch tube, because in this embodiment, the second switch tube is an NMOS, the input of the second switch tube is connected to the ground signal GND, the output of the second switch tube is used for connecting the first-stage driving pin of the darlington tube 1, and the control end of the second switch tube is connected to the control module 120. The input of the third switch tube is connected to the voltage capable of turning off the voltage of the third switch tube, because in this embodiment, the third switch tube is an NMOS, the input of the third switch tube is connected to the ground signal GND, the output of the third switch tube is used for connecting the second stage driving pin of the darlington tube 1, and the control end of the third switch tube is connected to the control module 120.
When the circuit 100 of the present invention is integrated into a chip, the first level driving end Q1B and the second level driving end Q2B may be provided on the chip. The prior art driver chip shown in fig. 1 has only one pin driving Q1, and the driving circuit 100 of the present invention provides two driving terminals Q1B and Q2B for driving. The first-stage driving end Q1B is connected to the output of the first switch unit 131 and the output of the second switch unit 132 at the same time, and is used for connecting to the first-stage driving pin of the darlington tube 1. The second-stage driving end Q2B is connected to the output of the third switching unit 133, and is used for connecting to the second-stage driving pin of the darlington tube 1.
Referring to fig. 3, in conjunction with fig. 2, the operation principle of the circuit 100 in this embodiment is as follows:
1) after the circuit 100 is started, the signal output to M1G by the control module 120 is at a high level, and the signals of M2G and M3G are at a low level, so that the switch M1 is controlled to be turned on, M2 and M3 are controlled to be turned off, at this time, the Ibase current flows to the darlington tube 1 through the Q1B port, the darlington tube 1 is turned on, and the voltage of the sampling terminal CS rises.
2) When the voltage of the sampling terminal CS rises to REF2, the signal of M1G switches from high to low to turn off M1, so that the Ibase current cannot flow into the darlington tube 1, but the voltage of the sampling terminal CS continues to rise due to the delay characteristic of the transistor.
3) When CS rises to REF1, the signals of M2G, M3G switch from low to high to turn on M2 and M3, pulling the Q1B port and Q2B port down to GND. Wherein the proportion of REF2/REF1 can be from 50% to 100%, when the proportion is 100%, the turn-off of M1 and the turn-on of M2 and M3 will occur simultaneously.
Based on same design, the utility model also discloses a darlington driver chip for flyback power supply, include:
a darlington drive circuit for a flyback power supply as claimed in any preceding claim;
a sampling end CS;
a ground terminal GND;
a first-stage driving end Q1B, connected to the output of the first switch unit 131 and the output of the second switch unit 132, for connecting to a first-stage driving pin of the darlington tube 1;
and a second-stage driving end Q2B connected to the output of the third switching unit 133 and used for connecting to a second-stage driving pin of the darlington tube 1.
For more details, reference may be made to the above circuit portions, which are not described herein again.
To sum up, the utility model discloses a darlington drive circuit and chip for flyback power supply has following beneficial effect: the utility model discloses an in the circuit, have three switch unit, provide the output of being connected respectively with two level drive feet of darlington pipe 1 jointly, when darlington pipe 1 is opened to needs, utilize first switch unit output triode turn-on signal to realize, when darlington pipe 1 is closed to needs, utilize second switch unit and third switch unit output triode shut-off signal to realize, so the utility model discloses can realize the drive to darlington pipe 1, because the triode shut-off signal is all received to the two-stage triode moreover, so can close darlington pipe 1 rapidly.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (5)
1. A darlington drive circuit for a flyback power supply, the drive circuit comprising: the detection module is used for detecting the electric current that flows through the darlington pipe and generating corresponding sampling voltage, drive module, according to sampling voltage control drive module opens or closes the control module of darlington pipe, drive module includes:
the first switch unit is connected with the control module in input and outputs a first-stage driving pin for connecting the Darlington tube, and the first switch unit is used for outputting a triode conducting signal capable of conducting a first-stage triode of the Darlington tube when the first switch unit is turned on;
the second switch unit is connected with the control module in input and outputs a first-stage driving pin for connecting the Darlington tube, and the second switch unit is used for outputting a triode closing signal which can close a first-stage triode of the Darlington tube when the second switch unit is opened;
the third switch unit is input to the control module and outputs a second-stage driving pin used for being connected with the Darlington tube, and the third switch unit is used for outputting a triode closing signal capable of closing a second-stage triode of the Darlington tube when the third switch unit is opened;
when the Darlington tube needs to be opened, the control module opens the first switch unit and closes the second switch unit and the third switch unit; and when the Darlington tube needs to be closed, closing the first switch unit, and opening the second switch unit and the third switch unit.
2. The darlington driving circuit for a flyback power supply according to claim 1, wherein the first switching unit comprises a constant current source and a first switching tube, an input of the first switching tube is connected to the constant current source, an output of the first switching tube is connected to a first-stage driving pin of the darlington tube, and a control end of the first switching tube is connected to the control module.
3. The darlington driving circuit for a flyback power supply according to claim 1, wherein the second switching unit includes a second switching tube, an input of the second switching tube is grounded, an output of the second switching tube is used for connecting a first-stage driving pin of the darlington tube, and a control end of the second switching tube is connected to the control module.
4. The darlington driving circuit for a flyback power supply according to claim 1, wherein the third switching unit comprises a third switching tube, an input of the third switching tube is connected with a voltage capable of closing the third switching tube, an output of the third switching tube is connected with a second stage driving pin of the darlington tube, and a control end of the third switching tube is connected with the control module.
5. A darlington driver chip for a flyback power supply, comprising:
the darlington driving circuit according to any one of claims 1 to 4;
a sampling end;
a ground terminal;
the first-stage driving end is simultaneously connected with the output of the first switch unit and the output of the second switch unit and is used for being connected with a first-stage driving pin of the Darlington tube;
and the second-stage driving end is connected with the output of the third switch unit and is used for being connected to a second-stage driving pin of the Darlington tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020359562.6U CN211830730U (en) | 2020-03-19 | 2020-03-19 | Darlington driving circuit and chip for flyback power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020359562.6U CN211830730U (en) | 2020-03-19 | 2020-03-19 | Darlington driving circuit and chip for flyback power supply |
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| CN211830730U true CN211830730U (en) | 2020-10-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112769320A (en) * | 2021-01-04 | 2021-05-07 | 南京博兰得电子科技有限公司 | Clamp switch driving circuit |
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2020
- 2020-03-19 CN CN202020359562.6U patent/CN211830730U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112769320A (en) * | 2021-01-04 | 2021-05-07 | 南京博兰得电子科技有限公司 | Clamp switch driving circuit |
| CN112769320B (en) * | 2021-01-04 | 2022-11-29 | 南京博兰得电子科技有限公司 | Clamp switch driving circuit |
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Address after: 518057, room 10, building 5-8, Changhong science and technology building, twelve South tech Road, Nanshan District Science Park, Shenzhen, Guangdong Patentee after: Huimang Microelectronics (Shenzhen) Co.,Ltd. Address before: 518057, room 10, building 5-8, Changhong science and technology building, twelve South tech Road, Nanshan District Science Park, Shenzhen, Guangdong Patentee before: FREMONT MICRO DEVICES (SZ) Ltd. |
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| CP01 | Change in the name or title of a patent holder |