CN109194145A - It recommends the driving circuit of Switching Power Supply and recommends Switching Power Supply - Google Patents
It recommends the driving circuit of Switching Power Supply and recommends Switching Power Supply Download PDFInfo
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- CN109194145A CN109194145A CN201811235786.XA CN201811235786A CN109194145A CN 109194145 A CN109194145 A CN 109194145A CN 201811235786 A CN201811235786 A CN 201811235786A CN 109194145 A CN109194145 A CN 109194145A
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- unit
- pwm signal
- switch
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- voltage
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Classifications
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
-
- 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
Abstract
This application provides the driving circuit for recommending Switching Power Supply and Switching Power Supply is recommended, the first switch tube which is recommended using pwm signal driving unit in Switching Power Supply provides driving control signal；First driving unit obtains the driving control signal for driving second switch according to the voltage in the primary side winding of push-pull transformer, it does not need that rp unit is arranged for second switch and recommends unit, instead of rp unit and unit is recommended using the first driving unit, therefore, the hardware cost of the driving circuit is lower.
Description
Technical field
The invention belongs to switch power technology fields, more particularly to recommend the driving circuit of Switching Power Supply and recommend switch electricity
Source.
Background technique
Push-pull circuit is the output circuit of the transistor key connection of two opposed polarities.Push-pull circuit uses two parameter phases
Same power BJT pipe or MOSFET pipe, is present in circuit, the waveform of each responsible positive-negative half-cycle amplifies task with push pull mode.
Switching Power Supply is recommended, alternates work by two switching tubes, is equivalent to two Switching Power Supplies output power simultaneously,
Its output power is approximately equal to twice of single Switching Power Supply output power.Therefore, the output power for recommending Switching Power Supply is very big, work
It is very high to make efficiency.
Open loop recommends Switching Power Supply and is suitably applied in low cost, constant pressure input, the field of less demanding to the output precision of voltage regulation
It closes.The more commonly used driving method of Switching Power Supply is recommended in open loop PWM chip drive scheme.PWM chip drive scheme needs PWM
Driving unit, rp unit, moreover, also needing to increase by two driving unit difference when PWM driving unit driving capability deficiency
For driving two switching tubes, i.e., each recommends Switching Power Supply and need to be arranged 1 PWM driving unit, 1 rp unit, 2 drives
Moving cell causes the hardware cost for recommending Switching Power Supply higher.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of driving circuit for recommending Switching Power Supply and recommending switch electricity
Source, to solve the technical problem at high cost of the existing driving circuit for recommending Switching Power Supply.Its specific technical solution is as follows:
In a first aspect, providing a kind of driving circuit for recommending Switching Power Supply, comprising: pulse width modulation (PWM) signal drives
Moving cell and the first driving unit；
The control terminal of first switch tube in Switching Power Supply is recommended in the output end connection of the pwm signal driving unit, is used for
Generate the PWM drive signal for controlling the switch state of the first switch tube；
First driving unit is parallel between the first end and second end of the first switch tube, and first driving is single
The control terminal of second switch in Switching Power Supply is recommended described in the output end connection of member, which utilizes described first
The voltage at switching tube both ends controls the switch state of the second switch.
Optionally, first driving unit includes: the first one way conducting device, voltage-stabilizing device and first resistor；
One end of the first resistor connects the first end of the first switch tube, the other end connection of the first resistor
One end of the voltage-stabilizing device, the other end of the voltage-stabilizing device connect the second end of the first switch tube；
The first resistor connect the control terminal of the second switch with the common point of the voltage-stabilizing device；
The cathode of first one way conducting device connects the first end of the first switch tube, first one-way conduction
The anode of device connects the common point of the first resistor and the voltage-stabilizing device.
Optionally, the voltage-stabilizing device is voltage-stabiliser tube；
The cathode of the voltage-stabiliser tube connects the first resistor, and the anode of the voltage-stabiliser tube connects the first switch tube
Second end.
Optionally, the voltage-stabilizing device is second resistance；
One end of the second resistance connects the first resistor, and the other end connection described first of the second resistance is opened
Close the second end of pipe.
Optionally, the pwm signal driving unit has current-limiting function end, which further includes current detecting list
Member；
Branch road where the current detecting unit is series at the first switch tube or the second switch, and the electricity
The test side of stream detection unit connects the current-limiting function end of the pwm signal driving unit, and the current detecting unit is for sampling
The electric current flowed through in the push-pull transformer primary side winding；
The pwm signal driving unit is also used to be higher than predeterminated voltage threshold when the voltage for detecting the current-limiting function end
After value, output duty cycle is equal to the pwm signal of default duty ratio.
Optionally, the current detecting unit is 3rd resistor；
The second end of one end connection first switch tube of the 3rd resistor and the limit for connecting the pwm signal driving unit
Flow function end, the cathode of the other end connection input power of the 3rd resistor.
Optionally, the pwm signal driving unit includes the first PWM signal generation unit and the second driving unit；
The output end of first PWM signal generation unit connects the input terminal of second driving unit；
The output end of second driving unit connects the control terminal of the first switch tube, which is used for
The first switch tube on or off is driven after the pwm signal that first PWM signal generation unit generates is amplified.
Optionally, second driving unit includes opposite polarity third switching tube and the 4th switching tube；
The first end of the third switching tube connects the anode of the input power, the second end connection of the third switching tube
The control terminal of the first switch tube, the first end connection of the 4th switching tube are connected after the second end of 4th switching tube
The cathode of the input power, the control terminal of the third switching tube connect described in the control terminal of the 4th switching tube and connection
The output end of first PWM signal generation unit.
Optionally, the pwm signal driving unit includes the second PWM signal generation unit；
The output end of second PWM signal generation unit connects the control terminal of the second switch, second pwm signal
Unit is generated for generating the pwm signal for driving the second switch on or off.
Second aspect recommends Switching Power Supply present invention also provides one kind, including first switch tube, second switch, pushes away
Draw the driving that Switching Power Supply is recommended described in any one possible implementation of transformer, output unit and first aspect
Circuit；
The first end of the first switch tube connects the non-same polarity of the second primary side winding of the push-pull transformer, described
The cathode of the second end connection input power of first switch tube, control terminal connect pwm signal driving unit in the driving circuit
Output end；
The first end of the second switch connects the Same Name of Ends of the first primary side winding of the push-pull transformer, and described
The cathode of the second end connection input power of two switching tubes, control terminal connect the output of the first driving unit in the driving circuit
End；
First primary side winding connects the anode of the input power with the common end of second primary side winding；
The Same Name of Ends of first vice-side winding of the push-pull transformer connects the anode of the first one way conducting device, this first
The cathode of one way conducting device connects the anode of the output unit；
The non-same polarity of second vice-side winding of the push-pull transformer connects the anode of the second one way conducting device, this
The cathode of two one way conducting devices connects the anode of the output unit；
First vice-side winding connects the cathode of the output unit with the common end of second vice-side winding.
The driving circuit provided in this embodiment for recommending Switching Power Supply is to recommend switch electricity using pwm signal driving unit
First switch tube in source provides driving control signal；Using the first driving unit according in the primary side winding of push-pull transformer
Voltage obtains the driving control signal for driving second switch, does not need that rp unit is arranged for second switch and recommends
Unit (unit of recommending herein plays amplification), i.e., instead of rp unit and recommend unit using the first driving unit, because
This, the hardware cost of the driving circuit is lower.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram for recommending Switching Power Supply provided by the embodiments of the present application；
Fig. 2 is the circuit diagram that another kind provided by the embodiments of the present application recommends Switching Power Supply；
Fig. 3 be it is provided by the embodiments of the present application another recommend the circuit diagram of Switching Power Supply；
Fig. 4 be it is provided by the embodiments of the present application another recommend the circuit diagram of Switching Power Supply；
Fig. 5 be it is provided by the embodiments of the present application another recommend the circuit diagram of Switching Power Supply；
Fig. 6 be it is provided by the embodiments of the present application another recommend the circuit diagram of Switching Power Supply.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to Figure 1, a kind of structural schematic diagram for recommending Switching Power Supply of the embodiment of the present application is shown,
As shown in Figure 1, it includes: to be made of pwm signal driving unit 1 and the first driving unit 2 that this, which recommends Switching Power Supply,
Driving circuit and Q1, Q2, push-pull transformer T, diode D1, diode D2, inductance Lo and capacitor Co are together constituted and are recommended
Switching Power Supply.Wherein, the driving circuit is for driving the first switch tube Q1 and second switch Q2 recommended in Switching Power Supply.
The anode of the power end connection input power of pwm signal driving unit 1, the output end of pwm signal driving unit 1 connect
Connect the control terminal of first switch tube Q1.
The pwm signal driving unit 1 is used to generate the PWM drive signal of control Q1 on or off.Pwm signal driving
Unit can generate chip by PWM and form, moreover, the frequency and duty ratio of the pwm signal generated can be set according to actual needs
It is fixed.
The first end of one end connection Q1 of first driving unit 2, the second of the other end connection Q1 of the first driving unit 2
End, the control terminal of the output end connection Q2 of the first driving unit 2.
The voltage that first driving unit 2 is used in the primary side winding using push-pull transformer T drives Q2 on or off.
The non-same polarity of the second primary side winding of the first end connection push-pull transformer T of Q1, the second end of Q1 connect input
The cathode of power supply.The Same Name of Ends of the first primary side winding of the first end connection T of Q2, the second end connection input power of Q2 are born
Pole.The first primary side winding of T connects the anode of input power with the common end of the second primary side winding.
The Same Name of Ends of the first vice-side winding of T by one end of D1 connection Lo, the other end connection output capacitance Co's of Lo
One end, the common end of the other end connection the first vice-side winding and the second vice-side winding of Co, and the both ends of Co are output unit
Output end.The anode of the non-same polarity connection D2 of the second vice-side winding of T, the common end of the cathode connection D1 and Lo of D2.
Wherein, the effect of D1 and D2 is rectification, and Lo and Co constitute output unit.After power supply electrifying, pwm signal driving unit
1 issues the PWM wave of fixed frequency fixed duty cycle, when PWM wave is high level signal, Q1 conducting；After Q1 conducting, by A point
Voltage pull-down, at this point, VABFor low level, the first driving unit 2 exports low level, Q2 shutdown, and push-pull transformer T is by D1 to negative
It carries and energy is provided.
When PWM wave is low level signal, Q1 shutdown；Voltage of the voltage of A point close to input power after Q1 shutdown
Vin, at this point, VABFor high level, the first driving unit 2 exports high level, Q2 conducting, and T provides energy to load by D2.Q1 and
Q2 alternate conduction maintains the output voltage for recommending Switching Power Supply to keep constant.In such cases, the driving signal of Q2 is utilized and is pushed away
The voltage drawn in the primary side winding of transformer T is converted to, and therefore, there is no need to that rp unit is arranged for Q2 and recommends unit to realize
To the drive control of Q2.
The driving circuit provided in this embodiment for recommending Switching Power Supply is to recommend switch electricity using pwm signal driving unit
First switch tube in source provides driving control signal；First driving unit is according to the voltage in the primary side winding of push-pull transformer
The driving control signal for driving second switch is obtained, do not need that rp unit is arranged for second switch and recommends list
Member instead of rp unit and recommends unit using the first driving unit, therefore, the hardware cost of the driving circuit is lower.
Fig. 2 is referred to, the circuit diagram that the embodiment of the present application another kind recommends Switching Power Supply, the present embodiment are shown
In, pwm signal driving unit 1 includes the first PWM signal generation unit 11 and the second driving unit 12.First driving unit 2 can
To include the first one way conducting device, voltage-stabilizing device and first resistor.
In the present embodiment, the first PWM signal generation unit 11 is realized using 555 timers, the PWM that 555 timers generate
The driving capability of signal is insufficient, therefore, it is necessary to which the second driving unit 12 is arranged to amplify pwm signal, the second driving unit
12 can be realized using unit is recommended.
Wherein, the anode of the VCC pin connection input power of 555 timers, OUT pin recommend list as output end connection
The input terminal of member recommends the control terminal of the output end connection Q1 of unit.
As shown in Fig. 2, recommending unit includes third switching tube Q3 and the 4th switching tube Q4, wherein the polarity phase of Q3 and Q4
Instead, for example, Q3 is NPN transistor, Q4 is PNP transistor.
The anode of the first end connection input power of Q3, the second end of the second end connection Q4 of Q3, the first end connection of Q4
The cathode of input power.Meanwhile Q3 connected with the second end of Q4 after as the output end for recommending unit；The control terminal of Q3 and Q4 connects
As the input terminal for recommending unit after connecing.
As shown in Fig. 2, the first one way conducting device can use diode D3, voltage-stabilizing device can use voltage-stabiliser tube DZ1,
First resistor R3.
Wherein, R3 and DZ1 is connected in series, the first end of one end connection Q1 of R3, the cathode of the other end connection DZ1 of R3,
The second end of the anode connection Q1 of DZ1.R3 connects the control of Q2 with the common end of DZ1 as the output end of the first driving unit 2
End.
The first end of the cathode connection Q1 of D3, the common end of the anode connection R3 and DZ1 of D3, the effect of D3 is unidirectionally to lead
It is logical.The first end of Q1 is denoted as A point, the second end of Q1 is denoted as B point, and the effect of D3 is when the voltage of A point is higher than the voltage of B point
When, prevent the voltage of A point from directly acting on the control terminal of Q2.
The course of work of driving circuit provided in this embodiment is described below down:
After input power powers on, the output pin OUT output fixed frequency fixation of the first PWM signal generation unit 11 is accounted for
The pwm signal wave of empty ratio；
When output pin OUT is high level, Q3 conducting, the output voltage for recommending unit is approximately equal to the electricity of input power
Vin is pressed, that is, recommends unit output high level, Q1 conducting, by the voltage pull-down of A point, i.e. VABFor low level；At this point, the cathode of DZ1
Voltage is low level, and DZ1 is in off state, and the first driving unit exports low level, Q2 shutdown；At this point, push-pull transformer is logical
It crosses D1 and provides energy to load.
When output pin OUT is low level, Q4 conducting, the output voltage for recommending unit is approximately equal to 0, that is, recommends unit
Export low level, Q1 shutdown, at this point, the voltage of A point is approximately equal to the voltage Vin of input power, therefore VABFor high level；This
When, voltage-stabiliser tube DZ1 works in reversed pressure stabilizing state, and by the voltage clamp of the control terminal of Q2 in some voltage, i.e. the cathode of DZ1 is defeated
High level out, Q2 conducting；At this point, push-pull transformer provides energy to load by D2.Q1 and Q2 alternate conduction maintains output electricity
It presses constant.
By the above-mentioned course of work it is found that by selecting the voltage-stabiliser tube of suitable pressure stabilizing parameter that the driving control to Q2 can be realized
System.
It should be noted that the first above-mentioned PWM signal generation unit 11 can also using it is other being capable of output pwm signal
Chip or circuit realize；Meanwhile first driving circuit 2 can be using other grid sources electricity that can guarantee AB two o'clock voltage and Q2
The circuit of same-phase is pressed to realize.
In addition, Q1 and Q2 can be realized using NMOS tube in the present embodiment, can be used under other application scene other
The switching tube of type, the application do not limit this.
The driving circuit provided in this embodiment for recommending Switching Power Supply, the first driving unit use common resistance, pressure stabilizing
Pipe and diode significantly reduce cost compared with phase inverter and recommending unit.Moreover, the first PWM signal generation unit
It is to be realized using the low-down chip of cost, reduces the hardware cost of entire driving circuit.
Fig. 3 is referred to, showing the embodiment of the present application, another recommends the circuit diagram of Switching Power Supply, the present embodiment
In, the first driving unit 2 mainly includes resistance R3, resistance R4 and diode D3；Other parts and embodiment phase shown in Fig. 2
Together.
When OUT pin is high level, unit output high level, Q1 conducting, at this point, V are recommended in Q3 conductingABFor low level,
The output of first driving unit 2 is low level, Q2 shutdown；At this point, push-pull transformer provides energy to load by D1；
When OUT pin is low level, unit output low level, Q1 shutdown, at this point, V are recommended in Q4 conductingABFor high level,
R3 and R4 are divided, and the dividing ratios of R3 and R4, voltage i.e. the first driving unit 2 on R4 are arranged according to the driving voltage of Q2
Output voltage, Q2 conducting, push-pull transformer by D2 to load provide energy；Q1 and Q2 alternate conduction maintains output voltage
It is constant.
It should be noted that the first driving unit 2 in the present embodiment was not limited to form using resistance and diode
Resistance is realized, can also be realized using the circuit of the gate source voltage same-phase of other voltages that can make AB two o'clock and Q2.
The driving circuit provided in this embodiment for recommending Switching Power Supply, the first driving unit using the very low resistance of cost and
Diode realizes that cost is extremely low compared with phase inverter and recommending unit.Significantly reduce the hardware cost of entire driving circuit.
Fig. 4 is referred to, showing the embodiment of the present application, another recommends the circuit diagram of Switching Power Supply, the present embodiment
In, pwm signal driving unit 1 is realized using the second PWM signal generation unit 13.Wherein, the second PWM signal generation unit 13 is defeated
The enough driving switch pipes of the driving capability of pwm signal out.
In the present embodiment, the second PWM signal generation unit is realized using UCC2844 chip, and the VCC pin of UCC2844 connects
Connect the anode of input power, control terminal of the OUT pin as the output end connection Q1 of pwm signal driving unit 1.It can be according to reality
Border demand sets the frequency and duty ratio of the pwm signal of UCC2844 output.
After input power powers on, output pin OUT output setpoint frequency and the setting duty ratio of UCC2844 chip
Pwm signal wave, wherein the pwm signal of UCC2844 output can directly drive Q1 on or off；It is therefore not necessary to additionally be arranged
Amplifying unit, for example, recommending unit.
As shown in figure 4, the first driving unit 2 in the present embodiment can use diode D3, resistance R3 and voltage-stabiliser tube DZ1
It realizes.It is single that the course of work of the first driving unit 2 under such application scenarios may refer to the first driving in embodiment illustrated in fig. 2
The course of work of member, details are not described herein again.
In addition, in the other embodiments of the application, as shown in figure 5, the first driving unit can using D3, resistance R3 and
R4 realizes that the course of work of the first driving unit 2 under such application scenarios may refer to the first driving in embodiment illustrated in fig. 3
The course of work of unit, details are not described herein again.
Using the PWM with enough driving capabilities core occurs for the driving circuit provided in this embodiment for recommending Switching Power Supply
Piece drives Q1 on or off to generate pwm signal, and it is multiple to reduce circuit for the unit that no setting is required for amplifying pwm signal
Miscellaneous degree and control complexity.
Fig. 6 is referred to, showing the embodiment of the present application, another recommends the circuit diagram of Switching Power Supply, in the present embodiment
Pwm signal driving unit use the PWM with current-limiting function that chip (for example, UCC2844) occurs, under such application scenarios,
Driving circuit is also provided with current detecting unit 3.
Current detecting unit 3 is provided for sampling the electric current flowed through in main loop of power circuit, and by the electric signal that sampling obtains
Chip occurs to the PWM with current-limiting function, so that the duty ratio of the pwm signal of chip limitation output occurs for PWM.
Q1 and Q2 is connected in main loop of power circuit, and therefore, current detecting unit 3 can be connected on the branch where Q1
On or Q2 where branch road, the present embodiment is illustrated by taking the second end for being connected on Q2 as an example.As shown in fig. 6, current detecting
The CS pin of the test side connection UCC2844 of unit 3.
In one embodiment of the application, current detecting unit 3 can be realized using 3rd resistor R5, and one end of R5 connects
Connect the second end of Q2, the cathode of the other end connection input power of R5.The CS for one end connection UCC2844 that R5 is connect with Q2 draws
The electric current for flowing through Q2 is converted into voltage signal and is supplied to UCC2844 chip by foot, R5.
After the electric current in the main loop of power circuit for recommending Switching Power Supply increases, the electric current for flowing through Q2 becomes larger, on resistance R5
Voltage increases, if the voltage on R5 is greater than predetermined voltage threshold, determines in main loop of power circuit over-current phenomenon avoidance occur；At this point, PWM
The duty ratio that the pwm signal of chip (e.g., UCC2844 chip) output occurs keeps a certain steady state value, to prevent pwm signal
Duty ratio is excessive to cause circuit to damage.
Predetermined voltage threshold occurs chip by PWM and determines, for example, UCC2844 chip provides that the predetermined voltage threshold is 1V.
Then, according to the predetermined voltage threshold and the resistance value of actual current limliting demand selection R5.
It should be noted that the pwm signal driving unit of the present embodiment can generate pwm signal and tool using any
The chip of current limiting function, is not limited to UCC2844.
Using the PWM with current-limiting function chip occurs for the driving circuit provided in this embodiment for recommending Switching Power Supply, when
Detect that the electric current in the main loop of power circuit for recommending Switching Power Supply more than after setting electric current value, keeps accounting for for the pwm signal of output
Sky is than preventing the duty ratio of the pwm signal generated when the electric current in main loop of power circuit is excessive is excessive from causing to preset duty ratio
Circuit damage.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Step in each embodiment method of the application can be sequentially adjusted, merged and deleted according to actual needs.
Device in each embodiment of the application and the module in terminal and submodule can merge according to actual needs,
It divides and deletes.
In several embodiments provided herein, it should be understood that disclosed terminal, device and method, Ke Yitong
Other modes are crossed to realize.For example, terminal embodiment described above is only schematical, for example, module or submodule
Division, only a kind of logical function partition, there may be another division manner in actual implementation, for example, multiple submodule or
Module may be combined or can be integrated into another module, or some features can be ignored or not executed.Another point is shown
The mutual coupling, direct-coupling or communication connection shown or discussed can be through some interfaces, between device or module
Coupling or communication connection are connect, can be electrical property, mechanical or other forms.
Module or submodule may or may not be physically separated as illustrated by the separation member, as mould
The component of block or submodule may or may not be physical module or submodule, it can and it is in one place, or
It may be distributed on multiple network modules or submodule.Some or all of mould therein can be selected according to the actual needs
Block or submodule achieve the purpose of the solution of this embodiment.
In addition, each functional module or submodule in each embodiment of the application can integrate in a processing module
In, it is also possible to modules or submodule physically exists alone, it can also be integrated with two or more modules or submodule
In a module.Above-mentioned integrated module or submodule both can take the form of hardware realization, can also use software function
Energy module or the form of submodule are realized.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments can be realized those skilled in the art or using the present invention.To this
A variety of modifications of a little embodiments will be apparent for a person skilled in the art, and the general principles defined herein can
Without departing from the spirit or scope of the present invention, to realize in other embodiments.Therefore, the present invention will not be limited
It is formed on the embodiments shown herein, and is to fit to consistent with the principles and novel features disclosed in this article widest
Range.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. recommending the driving circuit of Switching Power Supply characterized by comprising pulse width modulation (PWM) signal driving unit and
One driving unit；
The control terminal of first switch tube in Switching Power Supply is recommended in the output end connection of the pwm signal driving unit, for generating
Control the PWM drive signal of the switch state of the first switch tube；
First driving unit is parallel between the first end and second end of the first switch tube, first driving unit
The control terminal of second switch in Switching Power Supply is recommended described in output end connection, which utilizes the first switch
The voltage at pipe both ends controls the switch state of the second switch.
2. driving circuit according to claim 1, which is characterized in that first driving unit includes: first unidirectionally to lead
Logical device, voltage-stabilizing device and first resistor；
One end of the first resistor connects the first end of the first switch tube, described in the other end connection of the first resistor
One end of voltage-stabilizing device, the other end of the voltage-stabilizing device connect the second end of the first switch tube；
The first resistor connect the control terminal of the second switch with the common point of the voltage-stabilizing device；
The cathode of first one way conducting device connects the first end of the first switch tube, first one way conducting device
Anode connect the common point of the first resistor and the voltage-stabilizing device.
3. driving circuit according to claim 2, which is characterized in that the voltage-stabilizing device is voltage-stabiliser tube；
The cathode of the voltage-stabiliser tube connects the first resistor, and the anode of the voltage-stabiliser tube connects the second of the first switch tube
End.
4. driving circuit according to claim 2, which is characterized in that the voltage-stabilizing device is second resistance；
One end of the second resistance connects the first resistor, and the other end of the second resistance connects the first switch tube
Second end.
5. driving circuit according to claim 1, which is characterized in that the pwm signal driving unit has current-limiting function
End, which further includes current detecting unit；
Branch road where the current detecting unit is series at the first switch tube or the second switch, and the electric current is examined
The test side for surveying unit connects the current-limiting function end of the pwm signal driving unit, and the current detecting unit is described for sampling
The electric current flowed through in push-pull transformer primary side winding；
The pwm signal driving unit is also used to after the voltage for detecting the current-limiting function end is higher than predetermined voltage threshold,
Output duty cycle is equal to the pwm signal of default duty ratio.
6. driving circuit according to claim 5, which is characterized in that the current detecting unit is 3rd resistor；
The second end of one end connection first switch tube of the 3rd resistor and the current limliting function for connecting the pwm signal driving unit
Energy end, the cathode of the other end connection input power of the 3rd resistor.
7. driving circuit according to claim 1-6, which is characterized in that the pwm signal driving unit includes
First PWM signal generation unit and the second driving unit；
The output end of first PWM signal generation unit connects the input terminal of second driving unit；
The output end of second driving unit connects the control terminal of the first switch tube, which is used for institute
The first switch tube on or off is driven after stating the pwm signal amplification of the first PWM signal generation unit generation.
8. driving circuit according to claim 7, which is characterized in that second driving unit includes opposite polarity
Three switching tubes and the 4th switching tube；
The first end of the third switching tube connects the anode of the input power, described in the second end connection of the third switching tube
The control terminal of the first switch tube is connected after the second end of 4th switching tube, described in the first end connection of the 4th switching tube
The cathode of input power, the control terminal of the third switching tube connect the control terminal of the 4th switching tube and connect described first
The output end of PWM signal generation unit.
9. driving circuit according to claim 1-6, which is characterized in that the pwm signal driving unit includes
Second PWM signal generation unit；
The output end of second PWM signal generation unit connects the control terminal of the second switch, which generates
Unit is for generating the pwm signal for driving the second switch on or off.
10. one kind recommends Switching Power Supply, which is characterized in that including first switch tube, second switch, push-pull transformer, output
Unit and the described in any item driving circuits for recommending Switching Power Supply of claim 1-9；
The first end of the first switch tube connects the non-same polarity of the second primary side winding of the push-pull transformer, and described first
The cathode of the second end connection input power of switching tube, control terminal connect the defeated of pwm signal driving unit in the driving circuit
Outlet；
The first end of the second switch connects the Same Name of Ends of the first primary side winding of the push-pull transformer, and described second opens
The cathode of the second end connection input power of pipe is closed, control terminal connects the output end of the first driving unit in the driving circuit；
First primary side winding connects the anode of the input power with the common end of second primary side winding；
The Same Name of Ends of first vice-side winding of the push-pull transformer connects the anode of the first one way conducting device, this is first unidirectional
The cathode of conduction device connects the anode of the output unit；
The non-same polarity of second vice-side winding of the push-pull transformer connects the anode of the second one way conducting device, second list
The anode of the output unit is connected to the cathode of conduction device；
First vice-side winding connects the cathode of the output unit with the common end of second vice-side winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811235786.XA CN109194145B (en) | 2018-10-23 | 2018-10-23 | Drive circuit of push-pull switching power supply and push-pull switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811235786.XA CN109194145B (en) | 2018-10-23 | 2018-10-23 | Drive circuit of push-pull switching power supply and push-pull switching power supply |
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| CN109194145B CN109194145B (en) | 2020-01-21 |
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| CN111193412A (en) * | 2020-02-10 | 2020-05-22 | 陕西理工大学 | Automatic uninterrupted power supply dual power supply system |
| CN111799991A (en) * | 2019-04-08 | 2020-10-20 | 华润矽威科技（上海）有限公司 | Chip power supply circuit |
| CN111800010A (en) * | 2019-04-08 | 2020-10-20 | 华润矽威科技（上海）有限公司 | Switching power supply circuit |
| CN111799993A (en) * | 2019-04-08 | 2020-10-20 | 华润矽威科技（上海）有限公司 | Driving circuit |
| CN112503231A (en) * | 2020-11-03 | 2021-03-16 | 西安领创电子科技有限公司 | Electromagnetic valve, electromagnetic valve control system and method |
| CN116945768A (en) * | 2023-07-04 | 2023-10-27 | 沧州铭洋自动化技术有限公司 | Corrugated board digital printer control system |
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