CN208589919U - A kind of single tube buck driver - Google Patents
A kind of single tube buck driver Download PDFInfo
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- CN208589919U CN208589919U CN201821464892.0U CN201821464892U CN208589919U CN 208589919 U CN208589919 U CN 208589919U CN 201821464892 U CN201821464892 U CN 201821464892U CN 208589919 U CN208589919 U CN 208589919U
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- resistance
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- pwm controller
- pwm
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Abstract
The utility model belongs to electronic circuit technology field, disclose a kind of single tube buck driver, including the first inductance, the second inductance, first diode, the second diode, third diode, first capacitor, the second capacitor, third capacitor, first resistor and NMOS tube.The utility model sets pwm pulse width by microcontroller, and the pwm pulse width of setting is exported to PWM controller as current feedback reference signal, PWM controller is realized according to the turn-on time that the reference signal controls NMOS tube stablizes output electric current, so that changing pwm pulse width by microcontroller, achieve the purpose that Serial regulation exports electric current.
Description
Technical field
The utility model belongs to electronic circuit technology field, and in particular to a kind of single tube buck driver.
Background technique
With the rapid development in consumer electronics product market, portable electronic product constantly turns to miniaturization, lightness
Become, the volume of product becomes smaller so that the volume and capacity of its battery also reduce therewith.This requires improve such production as much as possible
The transfer efficiency of product power supply module reduces power consumption, and can provide in wider cell voltage variation range stable defeated
Voltage out, to extend the use time of battery.The buck driver that can be worked under wide input range is widely used in this
Class occasion.
Fig. 1 is a kind of circuit diagram of buck driver in the prior art.The buck driver will input electricity
Pressure V is converted to output voltage Vout, uses an independent booster circuit and an independent reduction voltage circuit to realize, i.e., first uses
Input voltage V is increased to preset voltage value by booster circuit, then is realized with reduction voltage circuit zero to continuously becoming between preset voltage value
Change.The disadvantage is that the buck driver needs two PWM controllers to control two NMOS tubes respectively, control is complicated and cost compared with
It is high.
Fig. 2 is the circuit diagram of another buck driver in the prior art, which will export
Cathode Vout- is connected to input voltage anode V+, and output voltage Vout+ is that predeterminated voltage subtracts input voltage V+.The disadvantage is that defeated
Voltage adaptation range is small out, and output voltage will receive the influence of input voltage.
Utility model content
In order to solve the above problems existing in the present technology, the utility model aim is to provide a kind of single tube buck drive
Dynamic device.The utility model sets pwm pulse width by microcontroller, and the pwm pulse width of setting is exported and is controlled to PWM
Device is stablized defeated as current feedback reference signal, PWM controller according to the turn-on time realization that the reference signal controls NMOS tube
Electric current out achievees the purpose that Serial regulation exports electric current so that changing pwm pulse width by microcontroller.
The technology employed by the present utility model is
A kind of single tube buck driver, including the first inductance, the second inductance, first diode, the second diode, third
Diode, first capacitor, the second capacitor, third capacitor, first resistor and NMOS tube；One end of first inductance and
One end of one capacitor is connected to voltage input end；The other end of first capacitor is grounded, and the other end of the first inductance is respectively with the
The drain electrode of the anode of one diode, the cathode of the second diode and NMOS tube connects；The source electrode of NMOS tube is grounded, NMOS tube
Grid is connected with the PWM drive circuit for driving its on-off；The cathode of third diode successively pass through first resistor, third capacitor and
It is connect after second inductance with the anode of third diode；The cathode of third diode and the binding site of first resistor are respectively with first
The connection of one end of the cathode of diode and the second capacitor, the other end ground connection of the second capacitor；The anode of third diode and
The connection of the anode of the binding site of two inductance and the second diode；The third capacitor is voltage output end.
Further, it includes the PWM controller connecting with the grid of the NMOS tube that circuit, which occurs, for the pwm signal；Institute
It states PWM controller and is connected with pwm signal input circuit.
Further, voltage feedback circuit is connected between the PWM controller and voltage output end.
Further, current feedback circuit is connected between the PWM controller and first resistor.
Further, the pwm signal input circuit includes microcontroller；Between the microcontroller and PWM controller
It is connected with integrating circuit and bleeder circuit.
Further, the integrating circuit includes second resistance and the 4th capacitor；The bleeder circuit include 3rd resistor,
4th resistance and the 4th diode；One end of second resistance is connect with microcontroller, the other end respectively with the 4th capacitor one
End and the connection of one end of 3rd resistor；The other end of 4th capacitor is grounded；The other end of 3rd resistor respectively with the four or two pole
The anode of pipe is connected with PWM controller；The cathode of 4th diode is connect with one end of the 4th resistance and microcontroller respectively；
The other end of 4th resistance is grounded.
Further, the bleeder circuit further includes the 5th resistance；5th resistor coupled in parallel has the 5th capacitor；5th resistance
One end is connect with PWM controller, other end ground connection.
Further, the voltage feedback circuit includes the 6th resistance and the 7th resistance；Distinguish at the both ends of 6th resistance
It is connect with one end of the voltage output end and the 7th resistance；The other end of 7th resistance is grounded；6th resistance and the 7th resistance
Binding site connect with the PWM controller.
Further, the current feedback circuit includes operational amplifier；The non-inverting input terminal of the operational amplifier and
Inverting input terminal is connect with the both ends of the first resistor respectively, and the output end of operational amplifier is connect with the PWM controller.
The utility model has the following beneficial effects:
The utility model sets pwm pulse width by microcontroller, and the pwm pulse width of setting is exported to PWM
Controller is realized steady as current feedback reference signal, PWM controller according to the turn-on time that the reference signal controls NMOS tube
Surely electric current is exported, so that changing pwm pulse width by microcontroller, achievees the purpose that Serial regulation exports electric current；Secondly, logical
Setting voltage feedback circuit and current feedback circuit are crossed, so that the voltage or electric current of the output of this single tube buck driver are more
Stablize；Also, this single tube buck driver output voltage range is wide；Electric current can start from scratch accurate control；Route is simple
Stablize, it is at low cost.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of buck driver in the prior art；
Fig. 2 is the circuit diagram of another buck driver in the prior art；
Fig. 3 is a kind of circuit diagram of single tube buck driver of the utility model.
Specific embodiment
With reference to the accompanying drawing and specific embodiment does further explaination to the utility model.
Embodiment 1:
As shown in figure 3, the present embodiment provides a kind of single tube buck driver, including the first inductance L1, the second inductance L2,
First diode D1, the second diode D2, third diode D4, first capacitor C1, the second capacitor C2, third capacitor C3, first
Resistance RS1 and NMOS tube Q1；One end of the first inductance L1 and one end of first capacitor C1 are connected to voltage input
End；The other end of first capacitor C1 is grounded, the other end of the first inductance L1 respectively with the anode of first diode D1, the two or two pole
The drain electrode connection of the cathode and NMOS tube Q1 of pipe D2；The source electrode of NMOS tube Q1 is grounded, and the grid of NMOS tube Q1 is connected with driving
The PWM drive circuit of its on-off；The cathode of third diode D4 successively passes through first resistor RS1, third capacitor C3 and the second electricity
It is connect after sense L2 with the anode of third diode D4；The binding site of the cathode of third diode D4 and first resistor RS1 respectively and
The connection of one end of the cathode of first diode D1 and the second capacitor C2, the other end ground connection of the second capacitor C2；Third diode
The anode of D4 is connect with the anode of the binding site of the second inductance L2 and the second diode D2；The third capacitor C3 is voltage output
End.
Wherein, first diode D1 plays rectified action, and the second diode D2 is used for isolation boosting and reduction voltage circuit, makes
Obtaining this single tube buck driver only uses a NMOS tube that can drive boosting and reduction voltage circuit；Third diode D4 is played
Afterflow effect.
Specifically, as shown in figure 3, it includes the grid with the NMOS tube Q1 that circuit, which occurs, for the pwm signal in the present embodiment
The PWM controller of connection；The PWM controller is connected with pwm signal input circuit.In the present embodiment, PWM controller uses type
Number for BP1808A DC-DC driving chip realize.
The pwm signal input circuit includes microcontroller；Integral is connected between the microcontroller and PWM controller
Circuit and bleeder circuit.
Specifically, as shown in figure 3, in the present embodiment, the integrating circuit includes second resistance R1 and the 4th capacitor C4；Institute
Stating bleeder circuit includes 3rd resistor R2, the 4th resistance R3 and the 4th diode D3；One end of second resistance R1 and microcontroller
Device connection, the other end are connect with one end of one end of the 4th capacitor C4 and 3rd resistor R2 respectively；4th capacitor C4's is another
End ground connection；The other end of 3rd resistor R2 is connect with the anode of the 4th diode D3 and PWM controller respectively；4th diode D3
Cathode connect respectively with one end of the 4th resistance R3 and microcontroller；The other end of 4th resistance R3 is grounded.It is arranged the 4th
The purpose of diode D3 is to pull down the 4th resistance R3 can only.Microcontroller can use existing chip microcontroller, this implementation
In example, microcontroller is realized using the ARM chip of STM32F2 series.
Preferably, the bleeder circuit further includes the 5th resistance R4；5th resistance R4 is parallel with the 5th capacitor C5；5th electricity
One end of resistance R4 is connect with PWM controller, other end ground connection.The pwm signal that integrating circuit exports microcontroller Iset pin
It is filtered into smooth DC voltage.The purpose that the 5th capacitor C5 is arranged is to reduce the interference of external environment.5th resistance R4 conduct
Pull down resistor uses.
As shown in figure 3, being connected with voltage feedback circuit between the PWM controller and voltage output end in the present embodiment.
Specifically, the voltage feedback circuit includes the 6th resistance R5 and the 7th resistance R6；The both ends of 6th resistance R5
It is connect respectively with one end of the voltage output end and the 7th resistance R6；The other end of 7th resistance R6 is grounded；6th resistance R5
It is connect with the binding site of the 7th resistance R6 with the PWM controller.
As shown in figure 3, being connected with current feedback electricity between the PWM controller and first resistor RS1 in the present embodiment
Road.
Specifically, the current feedback circuit includes operational amplifier U1B；The homophase input of the operational amplifier U1B
End and inverting input terminal are connect with the both ends of the first resistor RS1 respectively, the output end of operational amplifier U1B and the PWM
Controller connection.
Working principle:
As shown in figure 3, the pwm pulse width of its Iset pin is set to preset value by microcontroller.Pwm pulse is by the
The integrating circuit of two resistance R1 and the 4th capacitor C1 composition is smoothly DC voltage, using 3rd resistor R2 and the 4th resistance R3
After partial pressure, it is connected to the Iset&DIM pin of PWM controller, as the electricity of PWM controller after PWM controller internal conversion
Feedback reference value is flowed, Serial regulation output electric current is reached by the pwm pulse width for changing microcontroller to realize and change
Purpose.
It is 0.05-0.2V that the Iset&DIM pin voltage of PWM controller, which examines voltage in the production of 0.5-2V corresponding current, therefore single
Only PWM controller cannot achieve electric current and start from scratch adjustment.And when the Iset&DIM pin voltage of PWM controller is lower than
The DRV pin of 0.5V, PWM controller stop output pwm signal.Therefore pass through the pwm pulse of the DIM pin of control microcontroller
Width makes PWM controller enter discontinuous operation state, so as to adjust output current effective value, realizes that electric current is started from scratch
Control adjustment.It after the Iset&DIM pin voltage of PWM controller reaches 0.5V and is gradually increasing, is further continued for passing through microcontroller
The pwm pulse width of its DIM pin is controlled, electric current is exported with further adjustment.
The constant current and constant-voltage phase principle of this single tube buck driver are further described below:
Constant-current phase: output electric current flows through first resistor RS1 and generates pressure drop, after operational amplifier U1B differential amplification
Compared with the current feedback reference value of PWM controller, if the pressure drop on first resistor RS1 is greater than current feedback reference value, PWM control
Device processed reduces the pwm pulse width of its DRV pin output；If the pressure drop on first resistor RS1 is lower than current feedback reference value,
PWM controller increases the pwm pulse width of its DRV pin output；To reach electric current constant output.
Constant-voltage phase: output voltage connects after the 6th resistance R5 and the 7th resistance R6 partial pressure with the Vfb pin of PWM controller
It connects, the voltage of Vfb pin is compared with the reference voltage inside PWM controller；If the voltage of Vfb pin is higher than reference voltage, PWM
Controller reduces the pwm pulse width of its DRV pin output；If the voltage of Vfb pin is lower than reference voltage, PWM controller
Increase the pwm pulse width of its DRV pin output；To reach voltage constant output.
The utility model is not limited to above-mentioned optional embodiment, anyone can obtain under the enlightenment of the utility model
Other various forms of products out.Above-mentioned specific embodiment should not be understood the limitation of the pairs of protection scope of the utility model,
The protection scope of the utility model should be subject to be defined in claims, and specification can be used for explaining that right is wanted
Seek book.
Claims (9)
1. a kind of single tube buck driver, it is characterised in that: including the first inductance (L1), the second inductance (L2), the one or two pole
Manage (D1), the second diode (D2), third diode (D4), first capacitor (C1), the second capacitor (C2), third capacitor (C3),
First resistor (RS1) and NMOS tube (Q1)；One end of first inductance (L1) and one end connection of first capacitor (C1)
As voltage input end；The other end of first capacitor (C1) is grounded, the other end of the first inductance (L1) respectively with first diode
(D1) cathode of anode, the second diode (D2) and the drain electrode connection of NMOS tube (Q1)；The source electrode of NMOS tube (Q1) is grounded,
The grid of NMOS tube (Q1) is connected with the PWM drive circuit for driving its on-off；The cathode of third diode (D4) successively passes through
One resistance (RS1), third capacitor (C3) and the second inductance (L2) are connect with the anode of third diode (D4) afterwards；Third diode
(D4) binding site of cathode and first resistor (RS1) respectively with the cathode of first diode (D1) and the second capacitor (C2)
One end connection, the other end ground connection of the second capacitor (C2)；The anode of third diode (D4) and the binding site of the second inductance (L2)
It is connected with the anode of the second diode (D2)；The third capacitor (C3) is voltage output end.
2. a kind of single tube buck driver according to claim 1, it is characterised in that: circuit occurs for the pwm signal
Including the PWM controller being connect with the grid of the NMOS tube (Q1)；The PWM controller is connected with pwm signal input circuit.
3. a kind of single tube buck driver according to claim 2, it is characterised in that: the PWM controller and voltage
Voltage feedback circuit is connected between output end.
4. a kind of single tube buck driver according to claim 3, it is characterised in that: the PWM controller and first
Current feedback circuit is connected between resistance (RS1).
5. a kind of single tube buck driver according to claim 2, it is characterised in that: the pwm signal input circuit
Including microcontroller；Integrating circuit and bleeder circuit are connected between the microcontroller and PWM controller.
6. a kind of single tube buck driver according to claim 5, it is characterised in that: the integrating circuit includes second
Resistance (R1) and the 4th capacitor (C4)；The bleeder circuit includes 3rd resistor (R2), the 4th resistance (R3) and the four or two pole
It manages (D3)；One end of second resistance (R1) is connect with microcontroller, the other end respectively with one end of the 4th capacitor (C4) and
One end of three resistance (R2) connects；The other end of 4th capacitor (C4) is grounded；The other end of 3rd resistor (R2) is respectively with the 4th
The anode of diode (D3) is connected with PWM controller；The cathode of 4th diode (D3) one end with the 4th resistance (R3) respectively
And microcontroller connection；The other end of 4th resistance (R3) is grounded.
7. a kind of single tube buck driver according to claim 6, it is characterised in that: the bleeder circuit further includes
Five resistance (R4)；5th resistance (R4) is parallel with the 5th capacitor (C5)；One end of 5th resistance (R4) is connect with PWM controller,
Other end ground connection.
8. a kind of single tube buck driver according to claim 3, it is characterised in that: the voltage feedback circuit includes
6th resistance (R5) and the 7th resistance (R6)；The both ends of 6th resistance (R5) respectively with the voltage output end and the 7th resistance
(R6) one end connection；The other end of 7th resistance (R6) is grounded；The binding site of 6th resistance (R5) and the 7th resistance (R6) with
The PWM controller connection.
9. a kind of single tube buck driver according to claim 4, it is characterised in that: the current feedback circuit includes
Operational amplifier (U1B)；The non-inverting input terminal and inverting input terminal of the operational amplifier (U1B) respectively with the first resistor
(RS1) both ends connection, the output end of operational amplifier (U1B) are connect with the PWM controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821464892.0U CN208589919U (en) | 2018-09-07 | 2018-09-07 | A kind of single tube buck driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821464892.0U CN208589919U (en) | 2018-09-07 | 2018-09-07 | A kind of single tube buck driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208589919U true CN208589919U (en) | 2019-03-08 |
Family
ID=65545632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821464892.0U Withdrawn - After Issue CN208589919U (en) | 2018-09-07 | 2018-09-07 | A kind of single tube buck driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208589919U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768168A (en) * | 2018-09-07 | 2018-11-06 | 大山科技有限公司 | A kind of single tube buck driver |
-
2018
- 2018-09-07 CN CN201821464892.0U patent/CN208589919U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108768168A (en) * | 2018-09-07 | 2018-11-06 | 大山科技有限公司 | A kind of single tube buck driver |
| CN108768168B (en) * | 2018-09-07 | 2023-07-04 | 大山科技有限公司 | Single-tube up-down voltage driver |
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Legal Events
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190308 Effective date of abandoning: 20230704 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190308 Effective date of abandoning: 20230704 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |