CN208675108U - It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted - Google Patents
It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted Download PDFInfo
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- CN208675108U CN208675108U CN201821271987.0U CN201821271987U CN208675108U CN 208675108 U CN208675108 U CN 208675108U CN 201821271987 U CN201821271987 U CN 201821271987U CN 208675108 U CN208675108 U CN 208675108U
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Abstract
The utility model discloses one kind can be depressured the direct-current switch power supply conversion circuit also to boost, belong to switch power technology field, including input anode, input cathode, buck control terminal, PWM control terminal, resistance R1-R3, diode D1, D2, D3, D4, D5, operational amplifier N1A, N1B, inductance L1, capacitor C1, N-channel field-effect tube V2, P-channel field-effect transistor (PEFT) pipe V1, output negative pole and output cathode, the positive input of operational amplifier N1B can be dragged down by diode D5 when the buck control terminal input low level, make circuit work in BUCK decompression mode；The reverse input end of operational amplifier N1A can be drawn high by diode D4 when buck control terminal input high level, make circuit work in BOOST pressure-increasning state, the utility model, which realizes, can be depressured the function that can also boost, economical high, high-efficient advantage.
Description
Technical field
The utility model relates to switch power technology fields, can be depressured the direct current also to boost more particularly to one kind and open
Powered-down power-switching circuit.
Background technique
Switching Power Supply is the time ratio that control switch pipe turns on and off using modern power electronics technology, remains steady
Determine a kind of power supply of output voltage.Switching power circuit has small power consumption, conversion efficiency height, the small, the operation is stable of linear change etc.
Feature is therefore widely used in the various electronic equipments such as Industry Control, communication office, household consumption.
Most commonly seen non-isolated Switching Power Supply conversion regime is that BUCK decompression transformation and BOOST boost in Switching Power Supply
Two kinds of transformation, less common there are also BUCK-BOOST buck-boosts and SEPIC single ended primary induction to convert two classes.
In existing non-isolated Switching Power Supply conversion regime, simple BUCK translation circuit can only realize decompression transformation,
And BOOST translation circuit can only realize boosting inverter, when output voltage fluctuation range is larger or load voltage variation require it is larger,
It can not be applied in some applications, such as some multifunctional lithium ion cell charger products require that 6 can be connected serially to 1 section
Concatenated lithium ion battery charging is saved, for input power using power supply common in the market, input voltage range is 7V~19V,
Product requirement can charge (charging voltage 4.2V) to the concatenated lithium battery of 1 section but also to the concatenated lithium ion of 6 sections
Battery charges, charging voltage 25.2V, at this moment just may require that the internal conversion circuit of charger can be depressured and also wants to rise
Pressure, individual BUCK translation circuit and BOOST translation circuit are all unable to satisfy requirement.
Utility model content
The purpose of this utility model is to provide one kind can be depressured the direct-current switch power supply conversion circuit also to boost, has
Structure is simple, the advantages of having wide range of applications, can boost and being depressured, and solves that existing switching power supply structure is complicated, is lost
Greatly, cannot simultaneously boost or depressurization the problem of.
To achieve the above object, the utility model provides the following technical solutions: one kind can be depressured the direct current also to boost and open
Powered-down power-switching circuit, including input anode, input cathode, buck control terminal, PWM control terminal, resistance R1-R3, diode
D1, D2, D3, D4, D5, operational amplifier N1A, N1B, inductance L1, capacitor C1, N-channel field-effect tube V2, P-channel field-effect transistor (PEFT) pipe
V1, output negative pole and output cathode, the diode D3 are zener diode, one end of the input anode and resistance R1,
The positive power source terminal of operational amplifier N1A and the pole S of field-effect tube V1 are connected；The other end and zener diode of resistance R1
The cathode of D3 and the positive input of operational amplifier N1A are connected with the reverse input end of operational amplifier N1B；Operation
The output end of amplifier N1A is connect with the grid of field-effect tube V1；The drain electrode of field-effect tube V1 and one end of inductance L1 and two poles
The cathode of pipe D1 is connected；The other end of inductance L1 is connected with the anode of the drain electrode of field-effect tube V2 and diode D2；Two
The cathode of pole pipe D2 is connected with the anode of capacitor C1 and output cathode；The anode of buck control terminal and diode D4 and
The cathode of diode D5 is connected；The reversed input of the cathode of diode D4 and one end of resistance R2 and operational amplifier N1A
End is connected；The anode of diode D5 is connected with the positive input of one end of resistance R3 and operational amplifier N1B； PWM
Control terminal is connected with the other end of the other end of resistance R2 and resistance R3；The output end and field-effect tube of operational amplifier N1B
The grid of V2 connects；Input cathode and the anode of zener diode D3, the power supply negative terminal of operational amplifier N1, diode D1 just
The cathode of pole, the source electrode of field-effect tube V2 and capacitor C1 is connected, and constitutes common ground connection.
Preferably, the P-channel field-effect transistor (PEFT) pipe V1 can be substituted with PNP triode, and the N-channel field-effect tube V2 can be with
It is substituted with NPN triode.
Preferably, described operational amplifier N1A, N1B can be replaced with comparator.
Preferably, the voltage of the input anode is 7V-18V.
Preferably, the amplitude of the PWM control terminal is 5V.
Compared with prior art, the beneficial effects of the utility model are as follows:
(1) the utility model has the advantages that simple structure and reasonable design, installation maintenance are quick；
(2) in the technical solution of the utility model, this circuit both can be with reduced output voltage, and can also boost output, input with
Output polarity is identical and is common ground connection, easy to accomplish in control method；
(3) in the technical solution of the utility model, energy transfer devices only one inductance in circuit, power supply conversion effect
Rate is high, requires the application that input voltage is very wide or output voltage range is very wide some, have good practicability and
Economy.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, a kind of embodiment provided by the utility model: one kind can be depressured the direct-current switch power supply also to boost
Conversion circuit, including input anode, input cathode, buck control terminal, PWM control terminal, resistance R1-R3, diode D1, D2,
D3, D4, D5, operational amplifier N1A, N1B, inductance L1, capacitor C1, N-channel field-effect tube V2, P-channel field-effect transistor (PEFT) pipe V1, output
Cathode and output cathode, the diode D3 are zener diode, one end, the operation amplifier of the input anode and resistance R1
The positive power source terminal of device N1A and the pole S of field-effect tube V1 are connected；The other end of resistance R1 and the cathode of zener diode D3
And the positive input of operational amplifier N1A is connected with the reverse input end of operational amplifier N1B；Operational amplifier N1A
Output end connect with the grid of field-effect tube V1；The cathode of the drain electrode of field-effect tube V1 and one end of inductance L1 and diode D1
It is connected；The other end of inductance L1 is connected with the anode of the drain electrode of field-effect tube V2 and diode D2；Diode D2's is negative
Pole is connected with the anode of capacitor C1 and output cathode；The anode and diode D5 of buck control terminal and diode D4
Cathode is connected；The cathode of diode D4 is connected with the reverse input end of one end of resistance R2 and operational amplifier N1A；Two
The anode of pole pipe D5 is connected with the positive input of one end of resistance R3 and operational amplifier N1B；PWM control terminal and electricity
The other end of the other end and resistance R3 that hinder R2 is connected；The output end of operational amplifier N1B and the grid of field-effect tube V2 connect
It connects；Input cathode and the anode of zener diode D3, the power supply negative terminal of operational amplifier N1, the anode of diode D1, field-effect
The source electrode of pipe V2 and the cathode of capacitor C1 are connected, and constitute common ground connection.
The P-channel field-effect transistor (PEFT) pipe V1 can be substituted with PNP triode, and the N-channel field-effect tube V2 can use NPN
Triode substitution.
Described operational amplifier N1A, N1B can be replaced with comparator.
The voltage of the input anode is 7V-18V.
The amplitude of the PWM control terminal is 5V.
Working principle: the job analysis of the voltage-stabilized power supply circuit is as follows:
1, when the input of circuit anode and input cathode access input power, input power passes through resistance R1, in pressure stabilizing
Stable reference voltage Vref is generated on diode D3, Vref can be some value between 1V~4V, typical such as 2.4V；Vref
Voltage is supplied to the positive input of operational amplifier N1A and the reverse input end of operational amplifier N1B as comparison voltage；
2, when buck control terminal input low level, the forward direction of operational amplifier N1B can be inputted by diode D5
End drags down, and the reverse input end voltage (2.4V) of operational amplifier N1B is greater than positive input voltage, operational amplifier at this time
The output of N1B is low level, and field-effect tube V2 is made to be in cut-off off state；At this moment if PWM control terminal exports PWM waveform,
Pwm signal is added to the reverse input end of operational amplifier N1A by resistance R2, at this time since buck control terminal is low electricity
Flat, diode D4 is in reverse blocking state, since the signal amplitude of PWM is 5V, is greater than Vref voltage value, when pwm signal is
When high level, the reverse input end voltage of operational amplifier N1A can be higher than the Vref electricity of operational amplifier N1A positive input
Pressure, at this moment operational amplifier N1A exports low level, makes P-channel field-effect transistor (PEFT) pipe V1 saturation conduction；When pwm signal is low level,
The reverse input end voltage of operational amplifier N1A can be lower than the Vref voltage of operational amplifier N1A positive input, at this moment operation
Amplifier N1A exports high level, makes P-channel field-effect transistor (PEFT) pipe V1 cut-off shutdown；Therefore P-channel field-effect transistor (PEFT) pipe V1 is controlled by PWM letter
Number, it does not work at this time since field-effect tube V2 is in cut-off off state, by field-effect tube V1, diode D1, inductance L1, two
Pole pipe D2 and capacitor C1 constitutes BUCK reduced output voltage circuit, and power circuit works in BUCK decompression mode；
It 3, can be by D4 by the reverse input end of operational amplifier N1A when buck control terminal input high level (5V)
High level is drawn, the reverse input end voltage of operational amplifier N1A is greater than positive input voltage (2.4V) at this time, N1A operation
The output of amplifier is low level, so that field-effect tube V1 is in fully on state, is equivalent to input power and is directly connected to
Inductance L1；At this moment if PWM control terminal exports PWM waveform, pwm signal is being added to operational amplifier N1B just by resistance R3
To input terminal, at this time since buck control terminal is high level, diode D5 is in reverse blocking state, due to the signal of PWM
Amplitude is 5V, is greater than Vref voltage value, and when pwm signal is high level, the positive input voltage of operational amplifier N1B can be high
In the Vref voltage of operational amplifier N1B reverse input end, at this moment operational amplifier N1B exports high level, makes N-channel field-effect
Pipe V2 saturation conduction；When pwm signal is low level, the positive input voltage of operational amplifier N1B can be lower than operation amplifier
The Vref voltage of device N1B reverse input end, at this moment operational amplifier N1B exports low level, closes N-channel field-effect tube V2 cut-off
It is disconnected；Therefore N-channel field-effect tube V2 is controlled by pwm signal, at this time since field-effect tube V1 is in fully on state, by field
Effect pipe V2, inductance L1, diode D2 and capacitor C1 constitute BOOST boosting output circuit, and power circuit works in BOOST
Boost operating mode；
As known from the above, when buck control terminal input low level, which works in BUCK decompression work
Make state, the output voltage size of switching power circuit is controlled by the pulse width size of PWM control terminal；When buck control terminal
When input high level, which works in BOOST boosting working condition, the output voltage size of switching power circuit
It is controlled by the pulse width size of PWM control terminal；Therefore decompression conversion function both may be implemented in the circuit, also may be implemented to boost
Conversion function.
In practical application, by taking the application of multifunctional lithium ion cell charger as an example, 1 section may be constructed using the circuit
For lithium ion battery to the charging circuit of 6 section cascaded lithium ion batteries, input supply voltage is 9V~15V, two pole of pressure stabilizing in circuit
Pipe D3 uses the pressure stabilizing value of 2.4V, using the I/O port of a single-chip microcontroller as buck control terminal, is exported using the PWM of single-chip microcontroller
Mouth is used as PWM control terminal, and the supply voltage of single-chip microcontroller is 5V, when the voltage for being electrically charged battery of access is less than input supply voltage
When, it is low level that single-chip microcontroller, which can control buck control terminal, so that circuit is worked in BUCK decompression mode and charges the battery；
When the voltage for being electrically charged battery of access is equal to input supply voltage greatly, single-chip microcontroller can control buck control terminal as high electricity
It is flat, so that circuit is worked in BOOST boosting mode and charge the battery, what is no matter accessed in this way is the lithium ion of single-unit 3.6V
Battery pack or the concatenated 22.2V Li-ion batteries piles of 6 sections, the charging circuit can charge normal, and have applied widely
The characteristics of.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting
Related claim.
Claims (5)
1. one kind can be depressured the direct-current switch power supply conversion circuit also to boost, including input anode, input cathode, lifting are voltage-controlled
End processed, PWM control terminal, resistance R1-R3, diode D1, D2, D3, D4, D5, operational amplifier N1A, N1B, inductance L1, capacitor
C1, N-channel field-effect tube V2, P-channel field-effect transistor (PEFT) pipe V1, output negative pole and output cathode, it is characterised in that: the diode
D3 is zener diode, the input anode and one end of resistance R1, the positive power source terminal and field-effect tube of operational amplifier N1A
The pole S of V1 is connected；The positive input of the other end of resistance R1 and the cathode of zener diode D3 and operational amplifier N1A
It is connected with the reverse input end of operational amplifier N1B；The output end of operational amplifier N1A and the grid of field-effect tube V1 connect
It connects；The drain electrode of field-effect tube V1 is connected with the cathode of one end of inductance L1 and diode D1；The other end of inductance L1 and field are imitated
Should the drain electrode of pipe V2 and the anode of diode D2 be connected；The cathode of diode D2 and the anode and output cathode of capacitor C1
It is connected；Buck control terminal is connected with the cathode of the anode of diode D4 and diode D5；The cathode of diode D4 with
One end of resistance R2 and the reverse input end of operational amplifier N1A are connected；One end of the anode and resistance R3 of diode D5
And the positive input of operational amplifier N1B is connected；PWM control terminal and the other end of resistance R2 and the other end of resistance R3
It is connected；The output end of operational amplifier N1B is connect with the grid of field-effect tube V2；Input cathode and zener diode D3 just
Pole, the power supply negative terminal of operational amplifier N1, the anode of diode D1, the source electrode of field-effect tube V2 and capacitor C1 cathode be connected
It connects, constitutes common ground connection.
2. one kind according to claim 1 can be depressured the direct-current switch power supply conversion circuit also to boost, it is characterised in that:
The P-channel field-effect transistor (PEFT) pipe V1 can be substituted with PNP triode, and the N-channel field-effect tube V2 can be replaced with NPN triode
Generation.
3. one kind according to claim 1 can be depressured the direct-current switch power supply conversion circuit also to boost, it is characterised in that:
Described operational amplifier N1A, N1B can be replaced with comparator.
4. one kind according to claim 1 can be depressured the direct-current switch power supply conversion circuit also to boost, it is characterised in that:
The voltage of the input anode is 7V-18V.
5. one kind according to claim 1 can be depressured the direct-current switch power supply conversion circuit also to boost, it is characterised in that:
The amplitude of the PWM control terminal is 5V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821271987.0U CN208675108U (en) | 2018-08-08 | 2018-08-08 | It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821271987.0U CN208675108U (en) | 2018-08-08 | 2018-08-08 | It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted |
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| CN208675108U true CN208675108U (en) | 2019-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004825A (en) * | 2018-08-08 | 2018-12-14 | 福建飞毛腿动力科技有限公司 | It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted |
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2018
- 2018-08-08 CN CN201821271987.0U patent/CN208675108U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004825A (en) * | 2018-08-08 | 2018-12-14 | 福建飞毛腿动力科技有限公司 | It is a kind of to be depressured the direct-current switch power supply conversion circuit that boosted |
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