CN207994932U - A kind of firm power control circuit and apply its Switching Power Supply - Google Patents
A kind of firm power control circuit and apply its Switching Power Supply Download PDFInfo
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- CN207994932U CN207994932U CN201820009298.6U CN201820009298U CN207994932U CN 207994932 U CN207994932 U CN 207994932U CN 201820009298 U CN201820009298 U CN 201820009298U CN 207994932 U CN207994932 U CN 207994932U
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Abstract
The utility model is related to a kind of firm power control circuit and apply its Switching Power Supply.The firm power control circuit is electrically connected successively by compensating current generating circuit, overcurrent comparator, logic control circuit and compensation resistance；The Switching Power Supply is the Switching Power Supply using the firm power control circuit.The utility model can realize the control to power-supply system peak power output, effectively planarize the peak power output of power-supply system, and power switch tube caused by avoid output power unstable punctures, and have preferable use value.
Description
Technical field
The utility model is related to a kind of firm power control circuit and apply its Switching Power Supply.
Background technology
Power supply unit of the power supply as all electronic products not only needs to meet the requirement in performance, the protection of its own
Measure is also critically important, and as the power switch tube of primary switchgear, safeguard measure is also critically important.
Traditional switch power supply changeover device is as described in Figure 1, and Fig. 1 depicts a kind of power supply based on traditional pulse modulation technology
Converter 100.By being sampled after the voltage in the ancillary coil of transformer TR1 to the FB of power supply changeover device 100
Port is opened the light the unlatching of pipe Q1 to generate the square wave control power of pulse width variation, is passed through overcurrent comparator and is generated over-current signal
Q1 is turned off, but due to having one section to Q1 shutdowns when the delay of overcurrent protection comparator output signal causes overcurrent comparator to act on
Delay time, since there is no limit for electric current within this section of delay time, it is thus possible to generate larger peak value, cause heat excessively
It concentrates, since the ability that power switch tube bears overload is weaker, it is possible to the operation irregularity of power switch tube be caused even to damage.
Therefore traditional Over Current Protection System causes the electric current short time due to not accounting for the delay issue of converter internal signal
Increase, may thus cause the risk of switching tube permanent damages,
It is therefore necessary to change the current protection technology of switching power converters so that the output power of system is constant, protects
It is without damage to protect power switch tube.
Invention content
The purpose of this utility model is to provide a kind of firm power control circuit and its Switching Power Supply is applied, passes through electricity
The variation of Ton signals control compensation rate in road carrys out constant peak power output, effectively peak power output is made to planarize, protected
It is without damage to protect power switch tube.
To achieve the above object, the technical solution of the utility model is：A kind of firm power control circuit, including compensation electricity
Flow generation circuit, comparator, logic control circuit, compensation resistance；The first input end of the compensating current generating circuit, second
Input terminal inputs the first reference voltage, the second reference voltage, third input terminal and the logic control of compensating current generating circuit respectively
The output end of circuit processed connects, and the of the output end of compensating current generating circuit and the inverting input of comparator and compensation resistance
One end connects；Second end of the compensation resistance is connected to first input end of the inspection flow port as firm power control circuit；Institute
The in-phase input end for stating comparator is connect with third reference voltage, and the output end of comparator is connected to the first of logic control circuit
Input terminal；Second input terminal of second input terminal of the logic control circuit as firm power control circuit, logic control
Output end of the output end of circuit as firm power control circuit.
In one embodiment of the utility model, the second input terminal of the logic control circuit as pwm signal input terminal,
Logic control circuit responds pwm signal signal and generates a control signal, and the control signal is defeated by the output end of logic control circuit
Go out, and controls the size of compensating current generating circuit output current；The control signal is the adjustable square wave of a pulse width
Signal.
In one embodiment of the utility model, the compensating current generating circuit is by the first operational amplifier, the second operation
Amplifier, the first control switch, the second control switch, the first phase inverter, first resistor, charge and discharge capacitance, third operation amplifier
Device, the first transistor, second resistance, the first current mirror, the second current mirror and fixed current source composition；First operation
Amplifier and the in-phase input end of second operational amplifier are respectively connected to the first reference voltage, the second reference voltage, the first operation
Amplifier and the reverse side of second operational amplifier are connect with respective output end respectively；The first end of the first control switch
It being connect with the output end of the first operational amplifier, the second end of the first control switch and the first end of first resistor connect, and first
The control terminal of control switch is connect with the input terminal of the first phase inverter；The first end of the second control switch is put with the second operation
The output end connection of big device, the second end of the second control switch and the second end of first resistor connect, while and charge and discharge capacitance
First end and third operational amplifier in-phase end connection, the control terminal of the second control switch and the first phase inverter it is first defeated
Outlet connects；The input terminal of first phase inverter is connect with the output end of the logic control circuit；The charge and discharge capacitance
The second end of device is grounded；The reverse side of the third operational amplifier and the source electrode of the first transistor connect, third operation amplifier
The output end of device and the grid of the first transistor connect；The source electrode of the first transistor and the first end of second resistance connect,
The second end of second resistance is grounded；The drain terminal of the first transistor is connect with the first input end of the first current mirror；Described
First output end of one current mirror is connect with the first input end of the second current mirror, the second input termination electricity of the first current mirror
Source；First output end of second current mirror and the first output end of fixed current source and the compensating current generating circuit
Output end connects, the second input end grounding of the second current mirror；The first end of the fixed current source inputs termination power.
In one embodiment of the utility model, first current mirror is mutually matched by two Duis respectively with the second current mirror
Transistor composition.
The utility model additionally provides a kind of Switching Power Supply using firm power control circuit described above, including transformation
Device and a control circuit, the control circuit are coupled to input and the output end of transformer, are adjusted with generating a switching signal
The pulse width of the transformer；The control circuit is connect with pulse width modulator lotus root by firm power control circuit and is formed.
In one embodiment of the utility model, the Switching Power Supply can be applied to opto-coupled feedback isolated form and non-optocoupler
In feedback isolation type switch power supply system；The Switching Power Supply by compensating current generating circuit, comparator, logic control circuit,
Compensation resistance is embedded in an integrated circuit, to save external devices；Or the Switching Power Supply by compensating current generating circuit,
Comparator, logic control circuit are embedded in an integrated circuit, and the compensation resistance is external adjustable, when Convenient switch Power Management Design
Its maximum power programmability.
The utility model additionally provides a kind of Switching Power Supply using firm power control circuit described above, including transformation
Device and a control circuit, the control circuit coupling one is set to the feedback unit of transformer output end, to generate a switching signal
Adjust the pulse width of the transformer；The control circuit is connect with pulse width modulator lotus root by firm power control circuit and is formed.
In one embodiment of the utility model, the Switching Power Supply can be applied to opto-coupled feedback isolated form and non-optocoupler
In feedback isolation type switch power supply system；The Switching Power Supply by compensating current generating circuit, comparator, logic control circuit,
Compensation resistance is embedded in an integrated circuit, to save external devices；Or the Switching Power Supply by compensating current generating circuit,
Comparator, logic control circuit are embedded in an integrated circuit, and the compensation resistance is external adjustable, when Convenient switch Power Management Design
Its maximum power programmability.
Compared to the prior art, the utility model has the advantages that：The utility model can be realized to power supply system
The control for peak power output of uniting, effectively planarizes the peak power output of power-supply system, to avoid output power unstable
Power switch tube punctures caused by fixed, has preferable use value.
Description of the drawings
Fig. 1 is based on traditional Switching Power Supply converting system schematic diagram.
Fig. 2-1 is the Over Current Protection System with the utility model i.e. switch of firm power compensation circuit of an embodiment
Power conversion system schematic diagram one.
Fig. 2-2 is opening for the i.e. firm power compensation circuit of the Over Current Protection System with the utility model of another embodiment
Close power conversion system schematic diagram two.
Fig. 3 is the circuit connection diagram of the utility model firm power control circuit.
Fig. 4 is compensating current generating circuit schematic diagram.
Fig. 5 is compensation electric current and primary transformer coil peak point current oscillogram.
Primary clustering symbol description：
1000：Traditional Switching Power Supply converting system
100：Traditional switch power controller
2000：Switching Power Supply converting system one with firm power compensation circuit
2001：Switching Power Supply converting system two with firm power compensation circuit
200：The switch power controller of compensation circuit is controlled using firm power
3000：Firm power control circuit
4000：Compensating current generating circuit
5000：Compensate electric current and transformer peak point current oscillogram
Q1：Transistor
TR1：Transformer
D1：Diode
R1、R2、Rcpl、Rcs：Resistor
C、C1：Capacitor
301：Compensating current generating circuit
302：Comparator
303：Logic control circuit
401、402、403：Operational amplifier
404：Phase inverter
K1、K2：Controlled switch
N0、N1、N2：NMOS transistor
P0、P1：PMOS transistor
Io：Fixed current source
VIN：Input line voltage
Vref1、Vref2、Vcsth：Reference voltage
Vsw：Switching signal
VFB：Feedback voltage
PWM：Pulse width compares device output signal
Ton：Switching signal
The inverted signal of Ton switching signals
Icpl：Compensate electric current
Ipk：Primary inductance peak point current.
Specific implementation mode
Below in conjunction with the accompanying drawings, the technical solution of the utility model is specifically described.
The utility model provides a kind of firm power control circuit, by compensating current generating circuit, overcurrent comparator, logic
Controller and compensation resistance are according to being electrically connected.Specifically, referring to Fig. 3, Fig. 3 is this example firm power control circuit
3000 circuit connection diagram, in figure, by compensating current generating circuit, comparator, logic control circuit, compensation resistance according to
Electrical lotus root is connected together；Compensating current generating circuit inputs two reference voltage Vrefs 1, the control signal Ton of Vref2 and one,
The reference voltage of input is converted to offset voltage, then offset voltage is converted into the compensation compensated electric current of electric current Icpl, Icpl
First output of generation circuit is connected to the reverse side of comparator and compensates the first end of resistance；Compensate second end and the institute of resistance
It needs compensation circuit to connect, the of the second end of resistance and the source of power switch tube and sampling resistor is compensated in Fig. 2-1, Fig. 2-2
One end connects；The in-phase end of comparator inputs a reference voltage, the first input end company of the first output end and logic control circuit
It connects；By it after the pwm signal progress logical process that logic control circuit inputs the output signal of comparator and first input end
First output end output control signal Ton and the third input terminal for being connected to compensating current generating circuit, control the big of compensation rate
It is small.
In addition, compensation resistance described in the utility model can be with compensating current generating circuit, overcurrent comparator and logic control
Circuit processed is integrated in same integrated package, and controller is thus made to have constant output power；The compensation resistance also may be used
To be located away from outside the integrated integrated package of compensating current generating circuit, overcurrent comparator and logic control circuit, pass through adjusting in this way
The resistance value of compensation resistance can realize the adjustable of peak power output.
In order to allow those skilled in the art to be better understood from the utility model, below our combined circuits to the utility model
Operation principle is further described：
Continuing with referring to Fig. 2-1, Fig. 2-2, Fig. 3, firm power control circuit 3000 by compensating current generating circuit, compare
Device, logic control circuit and compensation resistance are according to being electrically connected；Compensating current generating circuit is practical for voltage electricity
Stream transformer exports logic control signal control compensation current generator by two by the first output end of logic control circuit
Input reference voltage is converted into offset voltage, then offset voltage is converted to required compensation electric current i.e. Icpl, defeated by first
Outlet output compensates electric current to the first end of the reverse side of comparator 302 and compensation resistance Rcpl；The in-phase end of comparator inputs
The electrical lotus root of first input end of one reference voltage, the first output end and logic control circuit of comparator connects；Logic control circuit
First output end output one control signal Ton through its first output be connected to compensating current generating circuit third input terminal and
The grid end of power switch tube；Control the square-wave signal that signal Ton is a pulse width variation；Compensate the second end of resistance Rcpl with
The source of power switch tube Q1 and the first end connection of sampling resistor Rcs；The second end of sampling resistor Rcs is grounded；Power switch
One end of the drain terminal of pipe Q1 and the primary coil of transformer is electrically connected.
Specific compensating current generating circuit as shown in figure 4, compensating current generating circuit 4000 by the first operational amplifier
401, second operational amplifier 402, first controls switch K1, the second control switch K2, the first phase inverter 404, first resistor device
R1, the first charge and discharge capacitance device C, third operational amplifier 403, the first metal-oxide-semiconductor, second resistor R2, the first current mirror, second
Current mirror and the first fixed current source they connect according to electrical lotus root；The same phase of first operational amplifier, second operational amplifier
Input terminal meets two reference voltage signals Vref1 and Vref2 respectively, and inverting input is respectively connected to output end；First control is opened
One end of pass is connected with one end of first resistor device, one end of the second control switch is connected with the other end of first resistor device
Connect, first control switch and second control switch by the first phase inverter input/output signal Ton andControl；First reverse phase
The input terminal of device 404 is connect with the first output end of logic control circuit 303；The first end of first charge and discharge capacitance device C and the
The second end connection of the first end of one resistor and the second control switch, other end ground connection；The in-phase end of third operational amplifier
It is connect with the second end of the first charge and discharge capacitance device first end and first resistor device, the reverse side of third operational amplifier and first
The source of metal-oxide-semiconductor is connected, and the output end of third operational amplifier and the grid end of the first metal-oxide-semiconductor link together, the first metal-oxide-semiconductor
Source be connected with the first end of second resistor, the second end of second resistor ground connection, the drain terminal of the first metal-oxide-semiconductor and first
The first input end of current mirror is connected, and the second input termination supply voltage of the first current mirror, the first current mirror passes through electric current
First output end is mirrored to the first input end of the second current mirror, the second input end grounding of the second current mirror, the second current mirror
The first output end and the first fixed current source according to electric connection, and be connected to the reverse side of comparator 302 and compensation resistance jointly
The first end of device；The operation principle of the compensating current generating circuit is as follows：
When Ton is 1,It is 0, controls switch K1 at this time and be closed, control switch K2 is disconnected, in the first operational amplifier
Under the action of, the first charge and discharge capacitance device C is charged to Vref1, and the charging time is the high level time of Ton；When Ton is 0,When being 1, the first control switch K1 is disconnected, and the second control switch K2 is closed, and second operational amplifier drags down V1 point current potentials
To Vref2；It can be obtained by the principle of switching capacity：
So the expression formula of output voltage V1 is：
Know that V1 is an amount changed as Ton changes by formula (2), when Ton is 0, then V1 output voltages are
Vref2；Work as Ton>>When RC, V1 output voltages are Vref1, therefore as Ton is got higher and when the time constantly becomes larger by low,
Then V1 can gradually rise to Vref1 from Vref2.
Assuming that the first current mirror, the ratio of the second current mirror is all 1:1, can must compensate electric current by the voltage of V1 is：
Formula (2), which is brought into formula (3), to be obtained
After choosing suitable fixed current source Io, the size for compensating electric current is only related with Ton, when Ton is smaller, compensation
Electric current is big；When Ton is larger, electric current is small or even uncompensation for compensation.
Compensation electric current Icpl obtains the reverse input end electricity of comparator after acting on compensation resistance Rcpl and Ipk collective effects
Pressure is：
Vref3=IcplRcpl+(Icpl+Ipk)*Rcs (5)
Due to the Rcpl of selection>>Rcs, therefore Icpl*Rcs can ignore, then formula (5) can be converted into formula (6) and obtain：
Vref3=Icpl*Rcpl+Ipk*Rcs (6)
By formula (4), (6) it is found that Vref3 is a fixed reference potential, therefore when the size variation of Ton, Ipk can be done on the contrary
Variation, waveform is as shown in Figure 5.
Shown in formula (6) and Fig. 5：When the output voltage is low, Ton can be very big, and compensation electric current Icpl is caused to become smaller in this way,
Ipk is larger；And output voltage it is higher when, Ton will become smaller, in this way compensate electric current Icpl will become larger, Ipk will become smaller.Cause
This is by making peak power output substantially planarized after compensation, so as to avoid the feelings of the excessive damage power tube of output power
Condition.
It is any ripe although the utility model is disclosed above with preferred embodiment, and should not limit the utility model
Know those skilled in the art, without departing from the spirit and scope of the utility model, when can make few modifications with replace, such as
Rcpl can be built in inside IC or the external penalty coefficient convenient for client's external, programmable peak power output, with suitable
Answer the Switching Power Supply of any power wattage.Therefore the scope of protection of the utility model when regard appended the scope of the claims institute's defender as
It is accurate.
It is the preferred embodiment of the utility model above, it is all to change according to made by technical solutions of the utility model, it is produced
Function without departing from technical solutions of the utility model range when, belong to the scope of protection of the utility model.
Claims (8)
1. a kind of firm power control circuit, it is characterised in that：Including compensating current generating circuit, comparator, logic control electricity
Road, compensation resistance；The first input end of the compensating current generating circuit, the second input terminal input respectively the first reference voltage,
Second reference voltage, the third input terminal of compensating current generating circuit and the output end of logic control circuit connect, and compensate electric current
The output end of generation circuit and the inverting input of comparator and the first end connection for compensating resistance；The second of the compensation resistance
It is connected to first input end of the inspection flow port as firm power control circuit；The in-phase input end of the comparator is joined with third
Voltage connection is examined, the output end of comparator is connected to the first input end of logic control circuit；The of the logic control circuit
The output end of second input terminal of two input terminals as firm power control circuit, logic control circuit is controlled as firm power
The output end of circuit.
2. a kind of firm power control circuit according to claim 1, it is characterised in that：The of the logic control circuit
As pwm signal input terminal, logic control circuit responds pwm signal signal and generates a control signal, control letter two input terminals
It number is exported by the output end of logic control circuit, and controls the size of compensating current generating circuit output current；The control
Signal is the adjustable square-wave signal of a pulse width.
3. a kind of firm power control circuit according to claim 1, it is characterised in that：The compensating current generating circuit
By the first operational amplifier, second operational amplifier, the first control switch, the second control switch, the first phase inverter, the first electricity
Resistance, charge and discharge capacitance, third operational amplifier, the first transistor, second resistance, the first current mirror, the second current mirror and one
Fixed current source forms；First operational amplifier and the in-phase input end of second operational amplifier are respectively connected to the first reference
The reverse side of voltage, the second reference voltage, the first operational amplifier and second operational amplifier connects with respective output end respectively
It connects；The first end of the first control switch is connect with the output end of the first operational amplifier, the second end of the first control switch
It is connect with the first end of first resistor, the control terminal of the first control switch is connect with the input terminal of the first phase inverter；Described second
The output end of the first end and second operational amplifier that control switch connects, and second controls the second end and first resistor switched
Second end connects, while being connect with the in-phase end of the first end of charge and discharge capacitance and third operational amplifier, the second control switch
Control terminal connect with the first output end of the first phase inverter；The input terminal of first phase inverter and the logic control circuit
Output end connection；The second end of the charge and discharge capacitance device is grounded；The reverse side of the third operational amplifier and the first crystalline substance
The source electrode of body pipe connects, and the output end of third operational amplifier and the grid of the first transistor connect；The first transistor
The first end of source electrode and second resistance connects, the second end ground connection of second resistance；The drain terminal of the first transistor and the first electricity
Flow the first input end connection of mirror；First output end of first current mirror is connect with the first input end of the second current mirror,
Second input termination power of the first current mirror；First output end of second current mirror and the first output of fixed current source
The connection of the output end of end and the compensating current generating circuit, the second input end grounding of the second current mirror；The fixed current
The first end in source inputs termination power.
4. a kind of firm power control circuit according to claim 3, it is characterised in that：First current mirror and
The transistor that two current mirrors are mutually matched by two Duis respectively forms.
5. a kind of Switching Power Supply using any firm power control circuit of Claims 1-4, it is characterised in that：Including
Transformer and a control circuit, the control circuit are coupled to input and the output end of transformer, to generate a switching signal
Adjust the pulse width of the transformer；The control circuit is connect with pulse width modulator lotus root by firm power control circuit and is formed.
6. Switching Power Supply according to claim 5, it is characterised in that：The Switching Power Supply can be applied to opto-coupled feedback
In isolated form and non-opto-coupled feedback isolation type switch power system；The Switching Power Supply by compensating current generating circuit, comparator,
Logic control circuit, compensation resistance are embedded in an integrated circuit, to save external devices；Or the Switching Power Supply is by compensating
Current generating circuit, comparator, logic control circuit are embedded in an integrated circuit, and the compensation resistance is external adjustable, convenient
Its maximum power programmability when Switching Power Supply designs.
7. a kind of Switching Power Supply using any firm power control circuit of Claims 1-4, it is characterised in that：Including
Transformer and a control circuit, the control circuit coupling one are set to the feedback unit of transformer output end, to generate a switch
The pulse width of transformer described in Signal Regulation；The control circuit connects group by firm power control circuit and pulse width modulator lotus root
At.
8. Switching Power Supply according to claim 7, it is characterised in that：The Switching Power Supply can be applied to opto-coupled feedback
In isolated form and non-opto-coupled feedback isolation type switch power system；The Switching Power Supply by compensating current generating circuit, comparator,
Logic control circuit, compensation resistance are embedded in an integrated circuit, to save external devices；Or the Switching Power Supply is by compensating
Current generating circuit, comparator, logic control circuit are embedded in an integrated circuit, and the compensation resistance is external adjustable, convenient
Its maximum power programmability when Switching Power Supply designs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820009298.6U CN207994932U (en) | 2018-01-04 | 2018-01-04 | A kind of firm power control circuit and apply its Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820009298.6U CN207994932U (en) | 2018-01-04 | 2018-01-04 | A kind of firm power control circuit and apply its Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207994932U true CN207994932U (en) | 2018-10-19 |
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ID=63818785
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820009298.6U Active CN207994932U (en) | 2018-01-04 | 2018-01-04 | A kind of firm power control circuit and apply its Switching Power Supply |
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| CN (1) | CN207994932U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884512A (en) * | 2020-03-18 | 2020-11-03 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply, power adapter and charger |
-
2018
- 2018-01-04 CN CN201820009298.6U patent/CN207994932U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884512A (en) * | 2020-03-18 | 2020-11-03 | 深圳市航嘉驰源电气股份有限公司 | Switching power supply, power adapter and charger |
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