CN112821731A - Synchronous rectifier tube driving circuit capable of being universally used for various output voltages - Google Patents
Synchronous rectifier tube driving circuit capable of being universally used for various output voltages Download PDFInfo
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- CN112821731A CN112821731A CN202110228389.5A CN202110228389A CN112821731A CN 112821731 A CN112821731 A CN 112821731A CN 202110228389 A CN202110228389 A CN 202110228389A CN 112821731 A CN112821731 A CN 112821731A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
The invention relates to the technical field of power supply conversion, in particular to a synchronous rectifier tube driving circuit which can be universally used for various output voltages, comprising a synchronous detection and control unit, a voltage stabilizing diode Dw, a first capacitor C1, a second capacitor C2, a comparator U, a resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R0, a sixth resistor Rg, a first driving tube Q1, a second driving tube Q2, a third driving tube Q3, a fourth driving tube Q4 and MOSFET tubes. The invention can obtain the adaptive drive of the universal synchronous rectifier tube with different DC output voltages as long as the invention is provided with the adaptive synchronous rectifier tube.
Description
Technical Field
The invention relates to the technical field of power supply conversion, in particular to a synchronous rectifier tube driving circuit which can be universally used for various output voltages.
Background
The synchronous rectification technology is a new technology in the technical field of modern power supply conversion. Have been widely adopted by industry and have been successfully used in various power conversion topologies with low voltage and high current output. Synchronous rectification technology is an important branch of the mainstream new technology of modern high-efficiency power supply transformation.
As for the synchronous rectification circuit, generally, three parts are formed 1. detection of synchronous signals and output of control signals; 2. a high-efficiency and synchronous driving circuit for realizing synchronous control signals to the power synchronous rectifier tube; 3. the main power loop of the conventional passive rectifier diode is replaced by an active synchronous rectifier tube.
The synchronous rectification is generally used for the application of low voltage and large current output and high efficiency requirement on a power supply, and the adoption of the synchronous rectification technology not only obviously improves the efficiency index, but also obviously reduces the temperature rise of the whole power supply, optimizes the running state of the power supply, and ensures the reliability and stability and greatly improves the important guarantee; for the MOS synchronous rectifier with low voltage and large current, the manufacturing technology in the industry has reached a higher level in the technical indexes of switching speed, on-current, low-voltage driving on-internal resistance, etc., and it is no longer difficult to directly select the synchronous rectifier with low-voltage driving characteristics.
The synchronous detection control circuit mostly comprises a first-stage high-speed voltage comparator circuit, which is a requirement for realizing synchronous detection and control of high-speed switching of output, namely quasi-synchronization, and generally, a non-low-cost high-speed voltage comparator can only be constructed in a working power supply below 5V, even though a 'rail-to-rail push-pull output' high-performance high-speed voltage comparator newly proposed in recent years, such as: TS3021, the control high level of its output also approaches only 5V.
Only a few synchronous rectification special chips exist in the industry nowadays, and are limited by the transformation topology; meanwhile, the power supply is limited by the wide range of power supply output requirement matching, and especially the effect is greatly reduced under the application condition of higher output voltage.
The emitter complementary output type totem pole driver which is commonly used in the industry has the advantages of high working speed, automatic avoidance of simultaneous conduction of complementary tubes, simple circuit structure, ultra-low cost and the like, and is widely used.
If the totem-pole driving circuit is directly adopted: with a high level of 4.5V and a low level of 0.7V, a synchronous rectification drive for low voltage, large current output is obviously the preferred solution. However, the situation that the synchronous rectification circuit with the driving capability and the structure is directly applied to the operation of higher voltage and large current is greatly different, and the biggest defect is that the driving level is too low. The drive level of synchronous rectification is improved, and the problem that the synchronous rectification technology is adopted by the high-voltage 12V output power supply which is larger than 3A in the industry is solved.
In the current power electronic technology, most of MOS transistors adapted to synchronous rectifiers cannot be driven by low voltage level due to over 100V withstand voltage, large current, low on-resistance and chip packaging, and even when MOS transistors with low switching threshold of Vgs switch are adopted, the on-resistance is increased, which is a problem of insufficient driving.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a general synchronous rectification driver for a large-current power supply with output from 12V to 48V, which is conveniently and universally used for matching driving of various synchronous rectification tubes, and the specific technical scheme is as follows:
a synchronous rectifier tube driving circuit capable of being commonly used for various output voltages comprises a synchronous detection and control unit, a voltage stabilizing diode Dw, a first capacitor C1, a second capacitor C2, a comparator U, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R0, a sixth resistor Rg, a first driving tube Q1, a second driving tube Q2, a third driving tube Q3, a fourth driving tube Q4 and a MOSFET tube;
the first end of the synchronous detection and control unit is connected with one end of a voltage stabilizing diode Dw, one end of a first capacitor C1, a positive power supply end of a comparator U and one end of a fifth resistor R0 and is connected with the power supply voltage Vc of the synchronous detection and control unit in parallel, the other end of the voltage stabilizing diode Dw is connected with the other end of a first capacitor C1 and is grounded GND, the second end of the synchronous detection and control unit is connected with the inverting input end of the comparator U, the third end of the synchronous detection and control unit is connected with the non-inverting input end of the comparator U and one end of a second capacitor C2, the output end of the comparator U is connected with the other end of a second capacitor C2, the base of a third driving tube Q3 and one end of a first resistor R1, the other end of the first resistor R1 is connected with the base of a fourth driving tube Q4, the collector of the fourth driving tube Q4 is connected with the base of the first driving tube Q1 and one end of the second resistor R2, the fourth end of the synchronous, One end of a fourth resistor R4, an emitter of a fourth driving tube Q4 and an emitter of a first driving tube Q1 are connected with and grounded GND, the other end of the fourth resistor R4 is connected with the emitter of the third driving tube Q3, a collector of the third driving tube Q3 is connected with one end of a third resistor R3 and a base of the second driving tube Q2, the other end of a fifth resistor R0 is connected with the other end of a third resistor R3, the other end of the second resistor R2 and the emitter of the second driving tube Q2 and is connected with a power supply voltage Vcc, one end of a sixth resistor Rg is connected with the collector of the first driving tube Q1 and the collector of the second driving tube Q2, and the other end of the sixth resistor Rg outputs driving signals.
Furthermore, the circuit further comprises a synchronous rectifier tube MOSFET, the grid electrode of the MOSFET is connected with the other end of the sixth resistor Rg and used for being connected with and inputting the driving signal, the source electrode of the MOSFET is connected with the emitting electrode of the first driving tube Q1, and the drain electrode of the MOSFET is externally connected with the negative end of the transformer winding.
The design and application of the synchronous rectification drive circuit aim at the power supply conversion topology of the current medium and small power AC/DC or DC/DC single-ended flyback and non-current continuous mode, and the output rectification application condition of a rectifier tube can be set by adopting a negative end; as long as the adaptive synchronous rectifier tube is provided, the adaptive driving of the universal synchronous rectifier tube with different direct current output voltages can be obtained, and the adaptive rectified output voltage is 1.2-48 Vdc: adapting the rectified output current 1-10 Adc; the adaptation drives almost all N-channel MOS type synchronous rectifiers.
Drawings
FIG. 1 is a conventional classical synchronous rectified drive circuit;
FIG. 2 is a synchronous rectification high efficiency driving circuit of the present invention suitable for different output voltages;
in the figure, 1-synchronous detection and control unit.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
Fig. 1 shows a conventional synchronous rectification driving circuit with a classic "totem-pole" structure, which includes: the synchronous detection and control circuit comprises a synchronous detection and control unit 1, a voltage stabilizing diode Dw, a first capacitor C1, a second capacitor C2, a comparator U, a fifth resistor R0, a sixth resistor Rg, a first driving tube Q1, a second driving tube Q2 and a MOSFET tube;
the first end of the synchronous detection and control unit 1 is connected with one end of a voltage stabilizing diode Dw, one end of a first capacitor C1, a positive power supply end of a comparator U and one end of a fifth resistor R0 and connected with the supply voltage Vc of the synchronous detection and control unit 1 in parallel, the other end of the voltage stabilizing diode Dw is connected with the other end of the first capacitor C1 and connected with the GND, the second end of the synchronous detection and control unit 1 is connected with the inverting input end of the comparator U, the third end of the synchronous detection and control unit 1 is connected with the non-inverting input end of the comparator U and one end of a second capacitor C2, the output end of the comparator U is connected with the other end of a second capacitor C2, the base of a first driving tube Q1 and the base of a second driving tube Q2, the fourth end of the synchronous detection and control unit 1 is connected with the negative power supply end of the comparator U and the collector of the second driving tube Q2 and connected with the GND and connected with the ground, the other end of the fifth resistor R0 is, one end of a sixth resistor Rg is connected with an emitter of the first driving tube Q1 and an emitter of the second driving tube Q2, the other end of the sixth resistor Rg is connected with a grid electrode of the MOSFET, a source electrode of the MOSFET is connected with the emitter of the first driving tube Q1, and a drain electrode of the MOSFET is externally connected with a negative end of the transformer winding.
The optimum supply voltage of the circuit supply voltage Vcc is only 5V or slightly higher than 5V, and the circuit supply voltage Vcc is approximately equal to the potential of the supply voltage Vc of the synchronous detection and control unit 1. The fifth resistor R0, the first capacitor C1 and the zener diode Dw are arranged to eliminate the interference caused by the driving of the first driving transistor Q1 and the second driving transistor Q2 outputting large current, and therefore, effective decoupling must be performed at the supply voltage Vc of the synchronous detection and control unit 1.
According to the driving circuit shown in fig. 1, only two transistors, i.e., the first driving transistor Q1 and the second driving transistor Q2, are required to form a classic "totem-pole" driver, so that the perfect driving of the synchronous rectifier tube outputting low voltage and large current can be simply realized. Limited by cost performance, the circuit units for realizing synchronous detection and control conversion are basically completed by adopting a high-speed comparator powered by low voltage, just like the comparator U adopted in fig. 1, the power supply and running conditions are the same, and the output synchronous control signals are basically the same no matter the level, the current and the characteristics, so that the control level output by the comparator U can only be high level: approaching +5V, low level: approaching 0V. The level thus determines that the level of the totem-pole output is only possible: the high level approaches +4.3V and the low level approaches 0.7V. It is impossible to increase the driving output level by increasing the voltage value of the circuit supply voltage Vcc, which not only fails to increase the output driving level of the totem pole, but also increases the loss of the totem pole circuit, and even causes the first driving transistor Q1 to burn out.
As shown in fig. 2, the synchronous rectification high-efficiency driving circuit applicable to different output voltages of the present invention is configured by adding two NPN type low power transistors of a third driving tube Q3 and a fourth driving tube Q4, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4 on the basis of the conventional synchronous rectification driving circuit of a totem-pole structure shown in fig. 1, and changing the common emitter output connection of the original first driving tube Q1 and the original second driving tube Q2 into a common collector output connection, and has the following specific technical scheme:
the first end of the synchronous detection and control unit 1 is connected with one end of a voltage stabilizing diode Dw, one end of a first capacitor C1, a positive power supply end of a comparator U and one end of a fifth resistor R0 and is connected with the power supply voltage Vc of the synchronous detection and control unit 1 in parallel, the other end of the voltage stabilizing diode Dw is connected with the other end of a first capacitor C1 and is grounded GND, the second end of the synchronous detection and control unit 1 is connected with the reverse phase input end of the comparator U, the third end of the synchronous detection and control unit 1 is connected with the non-inverting input end of the comparator U and one end of a second capacitor C2, the output end of the comparator U is connected with the other end of a second capacitor C2, the base of a third driving tube Q3 and one end of a first resistor R1, the other end of the first resistor R1 is connected with the base of a fourth driving tube Q4, the collector of the fourth driving tube Q4 is connected with the base of the first driving tube Q1 and one end of the second resistor R2, the fourth end of the synchronous detection, One end of a fourth resistor R4, an emitter of a fourth driving tube Q4 and an emitter of a first driving tube Q1 are connected with the ground GND, the other end of the fourth resistor R4 is connected with the emitter of the third driving tube Q3, a collector of a third driving tube Q3 is connected with one end of a third resistor R3 and a base of a second driving tube Q2, the other end of a fifth resistor R0 is connected with the other end of a third resistor R3, the other end of a second resistor R2 and the emitter of the second driving tube Q2 and is connected with a power supply voltage Vcc, one end of a sixth resistor Rg is connected with the collector of the first driving tube Q1 and the collector of the second driving tube Q2, the other end of the sixth resistor Rg is connected with a grid electrode of a MOSFET, a source electrode of the MOSFET is connected with the emitter of the first driving tube Q1, and a drain electrode of the MOSFET is externally connected with a negative terminal of a.
Specifically, the control signal output by the synchronous detection and control unit of the circuit is output by the comparator U, the level grade is only 0.7V to 4.3V, the control level synchronously drives the front transistors of the third driving tube Q3 and the fourth driving tube Q4 with different control tasks, the first resistor R1 is the input current limiting resistor of the fourth driving tube Q4, and as long as the control level rises to be greater than 0.7V, the fourth driving tube Q4 is rapidly saturated and turned on, so that the first driving tube Q1 is rapidly switched from on to off; on the contrary, when the control signal falls from the high level, only the fourth driving tube Q4 is turned off when the control signal falls below 0.7V, and the first driving tube Q1 is also turned back on. The fourth resistor R4 is a set resistor for controlling the emitter voltage-controlled current of the third driving tube Q3, and the third resistor R3 is set in the collector current loop of the third driving tube Q3, so that the second driving tube Q2 is controlled by the current threshold switch of the third driving tube Q3, and when the control signal level rises to more than 2.7V, that is, the voltage-controlled on-current of the third driving tube Q3 is more than 2mA, the second driving tube Q2 can be switched from the off state to the on state.
In summary, it can be seen that there is a section from 0.7V to 2.7V and about 2V in the rising transition process and the falling transition process from 5V to 0V of the control signal, and the first driving transistor Q1 and the second driving transistor Q2 are both turned off at the same time, which is completely similar to the classic driver; the first driving tube Q1 and the second driving tube Q2 are set in a common collector complementary driving output mode, which not only enables the output driving level to realize the conversion from 4.5V to 12V grade, but also can output the large current discharge characteristic with the low level approaching 0V, which is very ideal for the reliable driving of the synchronous rectifier with lower Vgs conversion threshold.
Claims (2)
1. A synchronous rectifier tube driving circuit capable of being commonly used for various output voltages comprises a synchronous detection and control unit (1), a voltage stabilizing diode Dw, a first capacitor C1, a second capacitor C2, a comparator U, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R0, a sixth resistor Rg, a first driving tube Q1, a second driving tube Q2, a third driving tube Q3, a fourth driving tube Q4 and MOSFET tubes, wherein the synchronous detection and control unit is connected with the first capacitor C1;
it is characterized in that the first end of the synchronous detection and control unit (1) is connected with one end of a voltage stabilizing diode Dw, one end of a first capacitor C1, a positive power end of a comparator U and one end of a fifth resistor R0 and is connected with the supply voltage Vc of the synchronous detection and control unit (1), the other end of the voltage stabilizing diode Dw is connected with the other end of a first capacitor C1 and is grounded GND, the second end of the synchronous detection and control unit (1) is connected with the reverse phase input end of the comparator U, the third end of the synchronous detection and control unit (1) is connected with the non-inverting input end of the comparator U and one end of a second capacitor C2, the output end of the comparator U is connected with the other end of a second capacitor C2, the base of a third driving tube Q3 and one end of a first resistor R1, the other end of a first resistor R1 is connected with the base of a fourth driving tube 493Q 2, the collector of a fourth driving tube Q4 is connected with the base of a, One end of a second resistor R2 is connected, a fourth end of the synchronous detection and control unit (1) is connected with a negative power supply end of a comparator U, one end of a fourth resistor R4, an emitter of a fourth driving tube Q4 and an emitter of a first driving tube Q1 and is grounded GND, the other end of the fourth resistor R4 is connected with an emitter of a third driving tube Q3, a collector of the third driving tube Q3 is connected with one end of a third resistor R3 and a base of the second driving tube Q2, the other end of a fifth resistor R0 is connected with the other end of the third resistor R3, the other end of a second resistor R2 and the emitter of the second driving tube Q2 and is connected with a power supply voltage Vcc in parallel, one end of a sixth resistor Rg is connected with a collector of the first driving tube Q1 and a collector of the second driving tube Q2, and the other end of the sixth resistor Rg outputs a driving signal.
2. The driving circuit of claim 1, further comprising a synchronous rectifier MOSFET, wherein a gate of the MOSFET is connected to the other end of the sixth resistor Rg for connecting to the input of the driving signal, a source of the MOSFET is connected to the emitter of the first driving transistor Q1, and a drain of the MOSFET is connected to the negative terminal of the transformer winding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110228389.5A CN112821731A (en) | 2021-03-02 | 2021-03-02 | Synchronous rectifier tube driving circuit capable of being universally used for various output voltages |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110228389.5A CN112821731A (en) | 2021-03-02 | 2021-03-02 | Synchronous rectifier tube driving circuit capable of being universally used for various output voltages |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006314154A (en) * | 2005-05-06 | 2006-11-16 | Sumitomo Electric Ind Ltd | Power converter |
| CN101902136A (en) * | 2009-05-26 | 2010-12-01 | 艾默生网络能源系统北美公司 | Driving device and driving method for synchronous rectifying tube |
| CN205074292U (en) * | 2015-07-10 | 2016-03-09 | 嘉兴百盛光电有限公司 | Ultrasonic cleaner's drive accelerating circuit |
| CN105978304A (en) * | 2016-06-28 | 2016-09-28 | 浙江求缺科技有限公司 | Synchronous rectification control driver |
| CN206506508U (en) * | 2017-03-03 | 2017-09-19 | 浙江特康电子科技有限公司 | A kind of MOSFET tube drive circuits |
| CN107295707A (en) * | 2016-04-11 | 2017-10-24 | 佛山市顺德区美的电热电器制造有限公司 | Drive circuit, electromagnetic heater and driving method |
| CN207706041U (en) * | 2017-12-20 | 2018-08-07 | 宝鸡文理学院 | The interlocking low level of communication power supply LLC topology circuit of synchronous rectification optimizes circuit |
| CN212210866U (en) * | 2020-04-01 | 2020-12-22 | 广东牧人王电器有限公司 | Double-balance resistance-capacitance voltage reduction power supply and MOS tube driving circuit |
-
2021
- 2021-03-02 CN CN202110228389.5A patent/CN112821731A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006314154A (en) * | 2005-05-06 | 2006-11-16 | Sumitomo Electric Ind Ltd | Power converter |
| CN101902136A (en) * | 2009-05-26 | 2010-12-01 | 艾默生网络能源系统北美公司 | Driving device and driving method for synchronous rectifying tube |
| CN205074292U (en) * | 2015-07-10 | 2016-03-09 | 嘉兴百盛光电有限公司 | Ultrasonic cleaner's drive accelerating circuit |
| CN107295707A (en) * | 2016-04-11 | 2017-10-24 | 佛山市顺德区美的电热电器制造有限公司 | Drive circuit, electromagnetic heater and driving method |
| CN105978304A (en) * | 2016-06-28 | 2016-09-28 | 浙江求缺科技有限公司 | Synchronous rectification control driver |
| CN206506508U (en) * | 2017-03-03 | 2017-09-19 | 浙江特康电子科技有限公司 | A kind of MOSFET tube drive circuits |
| CN207706041U (en) * | 2017-12-20 | 2018-08-07 | 宝鸡文理学院 | The interlocking low level of communication power supply LLC topology circuit of synchronous rectification optimizes circuit |
| CN212210866U (en) * | 2020-04-01 | 2020-12-22 | 广东牧人王电器有限公司 | Double-balance resistance-capacitance voltage reduction power supply and MOS tube driving circuit |
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Application publication date: 20210518 |