CN209233730U - Current-mode power circuit - Google Patents
Current-mode power circuit Download PDFInfo
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- CN209233730U CN209233730U CN201821995094.0U CN201821995094U CN209233730U CN 209233730 U CN209233730 U CN 209233730U CN 201821995094 U CN201821995094 U CN 201821995094U CN 209233730 U CN209233730 U CN 209233730U
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Abstract
The utility model discloses a kind of current-mode power circuit, the current-mode power circuit includes rectification module, voltage changing module, MOS switch pipe, power supply control integrated circuit, output filter module, current feedback resistor and voltage feedback module；The pressure feedback port of power supply control integrated circuit is fed back to from DC output end detection signal using voltage feedback module, and the Current Voltage of the primary coil of transformer is fed back to by the current feedback terminal that the power supply controls integrated circuit by current feedback resistor, the duty ratio of integrated circuit control output waveform is controlled by power supply again, achieve the purpose that adjust output voltage, it is simple with circuit structure, compact, power consumption is lesser, and the characteristics of output voltage stabilization.
Description
Technical field
The utility model relates to power technique fields more particularly to a kind of current-mode power circuits.
Background technique
Switching Power Supply is a kind of time ratio turned on and off by control switch pipe, maintains one stabilized the output voltage
Kind power supply, is generally made of components such as the integrated circuit of pulse width modulation control and metal-oxide-semiconductors.Currently, Switching Power Supply is with small
Type, light weight and efficient feature are widely applied in almost all of electronic equipment, are that current electronics and information industry flies
Speed develops a kind of indispensable power mode.
Switching Power Supply currently on the market, circuit structure is complicated, and volume is relatively bulky, and power consumption is relatively large, and output voltage is not
Stablize.In the application of some portable electronic devices, need a kind of circuit structure simple, compact, the lesser electricity of power consumption
Source circuit.
Utility model content
The utility model is intended to solve at least some of the technical problems in related technologies.For this purpose, this reality
It is to propose a kind of current-mode power circuit with a novel purpose.
To achieve the above object, according to the current-mode power circuit of the utility model embodiment, the current-mode electricity
Source circuit includes:
Rectification module, the rectification module are used for AC rectification into the first direct current；
Voltage changing module, the voltage changing module include transformer, primary coil one end of the transformer and the rectification mould
The output end of block connects, and the direct current for exporting the rectification module carries out transformation, and exports the second direct current；
MOS switch pipe, the drain electrode and another connection of primary coil of institute's transformer of the MOS switch pipe, the MOS switch
The source electrode of pipe is connect with reference；
Power supply controls integrated circuit, the pulse-width adjustment end of the power supply control integrated circuit and the grid of the MOS switch pipe
Pole connection, the power supply control integrated circuit are used for output pulse width modulated signal, and by the MOS switch pipe to the transformation
The primary coil of module carries out the pulsewidth modulation of voltage；
Output filter module, the output filter module are connect with the secondary coil of the transformer, for described the
Two direct currents are filtered, and export stable third direct current；
Current feedback resistor, the MOS switch pipe are connect by the current feedback resistor with the reference, the electricity
Stream feedback resistance is also connect with the current feedback terminal of power supply control integrated circuit with the common end of the MOS switch pipe；
Voltage feedback module, the voltage feedback module are connect with the output end of the output filter module, for institute
It states third direct current and carries out voltage sample, and the voltage sampling signal is transmitted to the voltage of the power supply control integrated circuit
Feedback controls pulse-width signal described in integrated circuit output by power supply, so that the third direct current keeps the steady of voltage
It is fixed.
Further, one embodiment according to the present utility model, the voltage changing module further include: inhale spike module, institute
Stating suction spike module includes diode D8, resistance R9 and capacitor C5；The anode of the diode D8 and the leakage of the MOS switch pipe
Pole connection, the cathode of the diode D8 are connect with one end of the resistance R9, capacitor C5 respectively, the resistance R9, capacitor C5
The other end connect respectively with described one end of the primary coil of the transformer.
Further, one embodiment according to the present utility model, the voltage feedback module include:
Divider resistance, the divider resistance include resistance R13 and resistance R15, the resistance R13 one end and the output
The output end of filter module connects, and the other end of the resistance R13 is connect with one end of the resistance R15, the resistance R15's
The other end is connect with reference；
Opto-coupled feedback circuit, the opto-coupled feedback circuit include resistance R16, resistance R18, optocoupler Q2 and a reference source U2；Institute
The one end for stating resistance R16 is connect with the output end of the output filter module, the other end and the resistance of the resistance R16
One end of R18 connects, and the other end of the resistance R18 is connect with the cathode of a reference source U2, the anode of a reference source U2
It with reference connect, the reference end of a reference source U2 is connect with the common end of the resistance R13, resistance R15, the optocoupler Q2
The anode at the end LED connect with the common end of the resistance R16, resistance R18, the cathode at the end LED of the optocoupler Q2 with it is described
The cathode of a reference source U2 connects, and the emitter of the triode signal output end of the optocoupler Q2 is connect with reference, the optocoupler
The collecting electrodes of the triode signal output end of Q2 are connect with the pressure feedback port of power supply control integrated circuit.
Further, one embodiment according to the present utility model further includes auxiliary power module, the auxiliary power supply mould
Block include inductance L3, diode D5 and capacitor C3, the inductance L3 one end with reference to connect, the other end of the inductance L3
It is connect with the anode of the diode D5, the cathode of the diode D5 is connect with one end of the capacitor C3, the capacitor C3
The other end with reference to ground connect, described one end of the capacitor C3 also with the power supply control integrated circuit feeder ear company
It connects.
Further, one embodiment according to the present utility model further includes external temperature feedback module, the external temperature
Spending feedback module includes resistance R8, diode D7 and thermistor RT1, and one end of the resistance R8 is described with the inductance L3's
Other end connection, the other end of the resistance R8 are connect with the anode of the diode D7, the cathode of the diode D7 and institute
State one end connection of thermistor RT1, the other end of the thermistor with referring to is connect, the diode D7 anode also with
Excess temperature test side (PRT) connection of the power supply control integrated circuit.
Further, one embodiment according to the present utility model, the power supply control integrated circuit include:
Feedback voltage processing module, the Voltage Feedback processing module is for simultaneously output error to be electric after handling feedback voltage
Pressure；
Feedback current processing module after the feedback current processing module is used to handle feedback current voltage value and exports
Current Voltage after slope compensation；
The output end of pwm comparator, the positive input terminal of the pwm comparator and the feedback current processing module connects
It connects, the negative input end of the pwm comparator is connect with the output end of feedback current processing module, and the pwm comparator is used for
Pulse-width control signal is generated according to the Current Voltage after the error voltage and slope compensation；
Rest-set flip-flop, the end R of the rest-set flip-flop are connect with the pulse-width control signal output end of the pwm comparator；
Crystal oscillator, the crystal oscillator output end are connect with the end S of the rest-set flip-flop, for passing through the arteries and veins
Width control signal triggers the pulse-width signal that the rest-set flip-flop generates the period；
Logic control module, the Logic control module are connect with the output end of the rest-set flip-flop, described for controlling
The output of the pulse-width signal in period；
MOS drive module, the MOS drive module are connect with the Logic control module, in the logic control
The pulse-width signal is exported under the action of module.
Further, one embodiment according to the present utility model, the power supply control integrated circuit further include:
Security protection module, the security protection module are connect with the Logic control module, the security protection module
It is transmitted to the Logic control module control module for safety detection, and by safety detection information, passes through the logic control
Module controls the output of the pulse-width signal in the period.
Further, one embodiment according to the present utility model, the security protection module further include:
External excess temperature overvoltage protective module, the input terminal and the power supply domination set of the external excess temperature overvoltage protective module
It is connected at the excess temperature test side (PRT) of circuit, the output end and the logic control mould of the external excess temperature overvoltage protective module
Block connection.
Further, one embodiment according to the present utility model, the security protection module further include: overcurrent protection mould
Any one or more in block, overvoltage protective module or internal temperature protective module, the overcurrent protection module, overvoltage protection
Module or internal temperature protective module are connect with the Logic control module respectively.
Current-mode power circuit provided by the embodiment of the utility model is examined using voltage feedback module from DC output end
The pressure feedback port that signal feeds back to power supply control integrated circuit is surveyed, and by current feedback resistor by the primary line of transformer
The Current Voltage of circle feeds back to the current feedback terminal of the power supply control integrated circuit, then controls integrated circuit control by power supply
The duty ratio of output waveform achievees the purpose that adjust output voltage, have circuit structure simple, compact, power consumption is lesser,
And the characteristics of output voltage stabilization.
Detailed description of the invention
Fig. 1 is current-mode circuit construction of electric power schematic diagram provided by the embodiment of the utility model；
Fig. 2 is that power supply provided by the embodiment of the utility model controls integrated electrical block diagram；
Fig. 3 is that another power supply provided by the embodiment of the utility model controls integrated electrical block diagram.
Appended drawing reference:
Rectification module 10；
Auxiliary power module 20；
Inhale spike module 30；
Voltage changing module 40；
Output filter module 50；
Voltage feedback module 60；
External temperature feedback module 70；
Current feedback module 80；
Em filtering capacitor 90；
Power supply controls integrated circuit 11；
Trigger 111；
Security protection module 112；
External overvoltage protection 1121；
External overheat protector 1122；
Temperature detection 1123；
Overvoltage protection 1124；
Overcurrent protection module 1125；
Feedback voltage processing module 113；
Feedback current processing module 114；
Crystal oscillator 115；
Trigger 116；
Logic control module 117；
MOS driving 118；
Low ebb detection 119；
MOS switch pipe 12.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, below in conjunction with the utility model reality
The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described.Unless otherwise defined,
All technical and scientific terms used herein are generally understood with person skilled in the technical field of the present invention
Meaning it is identical.Terminology used in the description of the utility model herein is intended merely to description specific embodiment
Purpose, it is not intended that in limitation the utility model.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
It is contained at least one embodiment of the utility model., which there is the phrase, in each position in the description to be each meant
Identical embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art are explicit
Ground and implicitly understand, embodiment described herein can be combined with other embodiments.
Refering to fig. 1, the utility model embodiment provides a kind of current-mode power circuit, comprising: rectification module 10, transformation
Module 40, MOS switch pipe 12, power supply control integrated circuit 11, output filter module 50, current feedback resistor and Voltage Feedback mould
Block 60, the rectification module 10 are used for AC rectification into the first direct current；As shown in Figure 1, the rectification module 10 includes
Four diodes constitute rectifier bridge.
The voltage changing module 40 includes transformer, and primary coil one end of the transformer is defeated with the rectification module 10
Outlet connection, the direct current for exporting the rectification module 10 carries out transformation, and exports the second direct current；The transformer
By first direct current by forming pulse direct current after impulse modulation, the pulse direct current is carried out by the transformer
Second direct current is exported after transformation.
The drain electrode and another connection of primary coil of institute's transformer of the MOS switch pipe 12, the source of the MOS switch pipe 12
Pole is connect with reference；The pulse-width adjustment end of the power supply control integrated circuit 11 is connect with the grid of the MOS switch pipe 12,
The power supply control integrated circuit 11 is used for output pulse width modulated signal, and by the MOS switch pipe 12 to the transformation mould
The primary coil of block 40 carries out the pulsewidth modulation of voltage；The pulse-width signal that integrated circuit 11 exports is controlled by the power supply
On and off control is carried out to the MOS switch pipe 12, to carry out pulsewidth modulation to first direct current.
The output filter module 50 is connect with the secondary coil of the transformer, for carrying out to second direct current
Filtering, and export stable third direct current；As shown in fig. 1, described includes diode D6 and filter capacitor C7, two pole
Pipe D6 rectifies second direct current, and exports stable third direct current after filtering by the filter capacitor C7,
Power supply is provided for power supply unit.
The MOS switch pipe 12 is connect by the current feedback resistor with the reference, the current feedback resistor
It is also connect with the current feedback terminal of power supply control integrated circuit 11 with the common end of the MOS switch pipe 12；The electric current
The Current Voltage of the primary coil of transformer is fed back to the current feedback terminal of the power supply control integrated circuit 11 by feedback resistance.
The voltage feedback module 60 is connect with the output end of the output filter module 50, for the third direct current
Electricity carries out voltage sample, and the voltage sampling signal is transmitted to the Voltage Feedback of the power supply control integrated circuit 11, leads to
It crosses power supply control integrated circuit 11 and exports the pulse-width signal, so that the third direct current keeps the stabilization of voltage.It is logical
The voltage feedback module 60 and current feedback resistor are crossed, so that the third direct current keeps stablizing.
Current-mode power circuit provided by the embodiment of the utility model is examined using voltage feedback module from DC output end
The pressure feedback port that signal feeds back to power supply control integrated circuit is surveyed, and by current feedback resistor by the primary line of transformer
The Current Voltage of circle feeds back to the current feedback terminal of the power supply control integrated circuit, then controls integrated circuit control by power supply
The duty ratio of output waveform achievees the purpose that adjust output voltage, have circuit structure simple, compact, power consumption is lesser,
And the characteristics of output voltage stabilization.
Refering to fig. 1, the voltage changing module 40 further include: inhale spike module 30, the suction spike module 30 includes diode
D8, resistance R9 and capacitor C5；The anode of the diode D8 is connect with the drain electrode of the MOS switch pipe 12, the diode D8
Cathode connect respectively with one end of the resistance R9, capacitor C5, the resistance R9, capacitor C5 the other end respectively with the change
Described one end of the primary coil of depressor connects.When the MOS switch pipe 12 shutdown, the primary coil of the transformer T1 is produced
Raw instantaneous pressure, the instantaneous pressure may burn the MOS switch pipe 12, pass through the electricity in the suction spike module 30
Resistance R9, capacitor C5 absorb the instantaneous pressure.
The voltage feedback module 60 includes: divider resistance and opto-coupled feedback circuit refering to fig. 1, and the divider resistance includes
Resistance R13 and resistance R15, one end of the resistance R13 are connect with the output end of the output filter module 50, the resistance
The other end of R13 is connect with one end of the resistance R15, and the other end of the resistance R15 is connect with reference；The resistance R13
After being divided the third direct current with resistance R15, output to the opto-coupled feedback circuit is returned by the opto-coupled feedback
Output voltage is fed back to the power supply and controls integrated circuit 11 by road.
The opto-coupled feedback circuit includes resistance R16, resistance R18, optocoupler Q2 and a reference source U2；The one of the resistance R16
End is connect with the output end of the output filter module 50, and one end of the other end of the resistance R16 and the resistance R18 connect
It connects, the other end of the resistance R18 is connect with the cathode of a reference source U2, and the anode and reference ground of a reference source U2 is even
It connects, the reference end of a reference source U2 is connect with the common end of the resistance R13, resistance R15, the end LED of the optocoupler Q2
Anode is connect with the common end of the resistance R16, resistance R18, and the cathode at the end LED of the optocoupler Q2 is with a reference source U2's
The emitter of cathode connection, the triode signal output end of the optocoupler Q2 is connect with reference, the triode of the optocoupler Q2
The collecting electrodes of signal output end are connect with the pressure feedback port of power supply control integrated circuit 11.The divider resistance will be defeated
Third direct current out feeds back to the reference end of a reference source U2, by a reference source U2 and optocoupler Q2 by third direct current
Feed back to the pressure feedback port of the power supply control integrated circuit 11.
Refering to fig. 1, further include auxiliary power module 20, the auxiliary power module 20 include inductance L3, diode D5 and
One end of capacitor C3, the inductance L3 are connect with reference, and the anode of the other end of the inductance L3 and the diode D5 connect
It connects, the cathode of the diode D5 is connect with one end of the capacitor C3, and the other end of the capacitor C3 is connect with reference, institute
The described one end for stating capacitor C3 is also connect with the feeder ear of power supply control integrated circuit 11.The inductance L3 and the transformation
The primary coil of device T1 carries out mutual inductance, generates the 4th direct current, and the 4th direct current is defeated after being rectified by the diode D5
Out, the 5th stable direct current is exported after and filtering by the capacitor C3, the 5th direct current is the power supply domination set
Power supply is provided at circuit 11.
It refering to fig. 1, further include external temperature feedback module 70, the external temperature feedback module 70 includes resistance R8, two
Pole pipe D7 and thermistor RT1, one end of the resistance R8 are connect with the other end of the inductance L3, the resistance R8's
The other end is connect with the anode of the diode D7, and the cathode of the diode D7 is connect with one end of the thermistor RT1,
The other end of the thermistor is connect with reference, and the diode D7 anode also controls integrated circuit 11 with the power supply
Excess temperature test side (PRT) connection.The resistance R8, diode D7 and thermistor RT1 are serially connected, the resistance R8, two poles
Pipe D7 and thermistor RT1 respectively divides the voltage of the auxiliary power module 20.Since the thermistor RT1 can
The change of resistance value is generated, according to the height of temperature so as to cause the mistake temperature detector for being input to the power supply control integrated circuit 11
Survey the change of the voltage value of end (PRT).So that the power supply control integrated circuit 11 can carry out overheat protector.
Referring to Fig.2, the power supply control integrated circuit 11 includes: feedback voltage processing module 113, feedback current processing mould
Block 114, pwm comparator, rest-set flip-flop 111, crystal oscillator, Logic control module 117 and MOS drive 118 modules, described
Voltage Feedback processing module is for after handling feedback voltage and output error voltage；The Voltage Feedback processing module will be described
The feedback voltage level in opto-coupled feedback circuit exports after carrying out Error processing to the pwm comparator.
After the feedback current processing module 114 is used to handle feedback current voltage value and export the electricity after slope compensation
Galvanic electricity pressure；After Current Voltage after current sampling resistor R19 sampling is carried out slope-compensation by the feedback current processing module 114
It exports to the pwm comparator.
The positive input terminal of the pwm comparator is connect with the output end of the feedback current processing module 114, the arteries and veins
The negative input end of wide comparator is connect with the output end of feedback current processing module 114, and the pwm comparator is used for according to institute
Current Voltage after stating error voltage and slope compensation generates pulse-width control signal；The pwm comparator is by the feedback voltage
After the output voltage values of processing module 113 and current processing module are compared, modulated pwm signal is exported.
The end R of the rest-set flip-flop 111 is connect with the pulse-width control signal output end of the pwm comparator；The crystal
Oscillator output end is connect with the end S of the rest-set flip-flop 111, for triggering the RS triggering by the pulse-width control signal
The pulse-width signal in the generation period of device 111；By the modulated pwm signal and crystal oscillator output signal to the RS
Trigger 111 is driven, to generate the pulse-width signal in the period.
The Logic control module 117 is connect with the output end of the rest-set flip-flop 111, for controlling the arteries and veins in the period
The output of wide modulated signal；The Safety output of the pulse-width signal in the period is realized by the Logic control module 117
Control.
The MOS drives 118 modules to connect with the Logic control module 117, in the Logic control module 117
Under the action of export the pulse-width signal.By the pulse-width signal to the MOS switch pipe 12 carry out conducting or
Cut-off control.
Refering to Fig. 3, the power supply controls integrated circuit 11 further include: security protection module 112, the security protection module
112 connect with the Logic control module 117, and the security protection module 112 is used for safety detection, and by safety detection information
It is transmitted to 117 control module of Logic control module, the pulsewidth tune in the period is controlled by the Logic control module 117
The output of signal processed.It is, the Logic control module 117 receives the output signal of the security protection module 112, and root
The output of the pulse-width signal in the period is controlled according to the output signal.For example, when the security protection module 112 exports
When overcurrent safeguard protection, the pulse-width signal that the Logic control module 117 controls the period stops output, avoids overcurrent
And generate security risk.
Refering to Fig. 3, the security protection module 112 further include: external 1124 module of excess temperature overvoltage protection, the external mistake
The input terminal of warm 1124 module of overvoltage protection is connect with the excess temperature test side (PRT) of power supply control integrated circuit 11, described
The output end of external 1124 module of excess temperature overvoltage protection is connect with the Logic control module 117.The external excess temperature over-voltage is protected
The voltage value that 1124 modules control the excess temperature test side (PRT) of integrated circuit 11 by detecting the power supply is protected, when the excess temperature
When the voltage value of test side (PRT) is below or above setting value, external 1124 module of excess temperature overvoltage protection exports high level,
The high level is transmitted to the Logic control module 117, and the Logic control module 117 controls the pulsewidth modulation in the period
Signal stops output, to realize overheat protector.
Refering to Fig. 3, the security protection module 112 further include: overcurrent protection module 1125,1124 module of overvoltage protection or
Any one or more in internal temperature protective module, the overcurrent protection module 1125, overvoltage protection 1124 module or interior
Portion's temperature protection module is connect with the Logic control module 117 respectively.Refering to Fig. 3, the overcurrent protection module 1125, over-voltage
Protect that 1124 modules or internal temperature protective module can pass through or door is connect with the Logic control module 117, by described
Logic control module 117 carries out safeguard protection.
The above is only the embodiments of the present invention, are not intended to limit the scope of the patents of the utility model, although referring to before
Embodiment is stated the utility model is described in detail, it, still can be right for coming for those skilled in the art
Technical solution documented by aforementioned each specific embodiment is modified, or carries out equivalent replace to part of technical characteristic
It changes.All equivalent structures done using the utility model specification and accompanying drawing content are directly or indirectly used in other correlations
Technical field, similarly within the utility model patent protection scope.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.
Although the embodiments of the present invention have been shown and described above, it is to be understood that above-described embodiment is
Illustratively, it should not be understood as limiting the present invention, those skilled in the art are not departing from the utility model
Principle and objective in the case where above-described embodiment can be changed in the scope of the utility model, modify, replace and
Modification.
Claims (9)
1. a kind of current-mode power circuit characterized by comprising
Rectification module, the rectification module are used for AC rectification into the first direct current；
Voltage changing module, the voltage changing module include transformer, primary coil one end and the rectification module of the transformer
Output end connection, the direct current for exporting the rectification module carries out transformation, and exports the second direct current；
MOS switch pipe, the drain electrode and another connection of primary coil of institute's transformer of the MOS switch pipe, the MOS switch pipe
Source electrode is connect with reference；
Power supply controls integrated circuit, and the pulse-width adjustment end of the power supply control integrated circuit and the grid of the MOS switch pipe connect
It connects, the power supply control integrated circuit is used for output pulse width modulated signal, and by the MOS switch pipe to the voltage changing module
Primary coil carry out voltage pulsewidth modulation；
Output filter module, the output filter module are connect with the secondary coil of the transformer, for straight to described second
Galvanic electricity is filtered, and exports stable third direct current；
Current feedback resistor, the MOS switch pipe are connect by the current feedback resistor with the reference, and the electric current is anti-
Feed resistance is also connect with the current feedback terminal of power supply control integrated circuit with the common end of the MOS switch pipe；
Voltage feedback module, the voltage feedback module are connect with the output end of the output filter module, for described the
Three direct currents carry out voltage sample, and the voltage that the voltage sampling signal is transmitted to the power supply control integrated circuit is anti-
Feedback controls pulse-width signal described in integrated circuit output by power supply, so that the third direct current keeps the stabilization of voltage.
2. current-mode power circuit according to claim 1, which is characterized in that the voltage changing module further include: inhale point
Peak module, the suction spike module include diode D8, resistance R9 and capacitor C5；The anode and the MOS of the diode D8
The drain electrode of switching tube connects, and the cathode of the diode D8 is connect with one end of the resistance R9, capacitor C5 respectively, the resistance
R9, capacitor C5 the other end connect respectively with described one end of the primary coil of the transformer.
3. current-mode power circuit according to claim 1, which is characterized in that the voltage feedback module includes:
Divider resistance, the divider resistance include resistance R13 and resistance R15, and one end of the resistance R13 and the output filter
The output end of module connects, and the other end of the resistance R13 is connect with one end of the resistance R15, and the resistance R15's is another
End is connect with reference；
Opto-coupled feedback circuit, the opto-coupled feedback circuit include resistance R16, resistance R18, optocoupler Q2 and a reference source U2；The electricity
One end of resistance R16 is connect with the output end of the output filter module, and the other end of the resistance R16 is with the resistance R18's
One end connection, the other end of the resistance R18 are connect with the cathode of a reference source U2, the anode of a reference source U2 and reference
Ground connection, the reference end of a reference source U2 are connect with the common end of the resistance R13, resistance R15, the LED of the optocoupler Q2
The anode at end is connect with the common end of the resistance R16, resistance R18, the cathode at the end LED of the optocoupler Q2 and a reference source
The cathode of U2 connects, and the emitter of the triode signal output end of the optocoupler Q2 is connect with reference, and the three of the optocoupler Q2
The collecting electrodes of pole pipe signal output end are connect with the pressure feedback port of power supply control integrated circuit.
4. current-mode power circuit according to claim 1, which is characterized in that it further include auxiliary power module, it is described
Auxiliary power module include inductance L3, diode D5 and capacitor C3, the inductance L3 one end with reference to connect, the inductance
The other end of L3 is connect with the anode of the diode D5, and the cathode of the diode D5 is connect with one end of the capacitor C3,
The other end of the capacitor C3 is connect with reference, and described one end of the capacitor C3 also controls integrated circuit with the power supply
Feeder ear connection.
5. current-mode power circuit according to claim 4, which is characterized in that it further include external temperature feedback module,
The external temperature feedback module include resistance R8, diode D7 and thermistor RT1, the resistance R8 one end and the electricity
Feel the other end connection of L3, the other end of the resistance R8 is connect with the anode of the diode D7, the diode D7
Cathode connect with one end of the thermistor RT1, the other end of the thermistor with reference to connect, the diode
D7 anode is also connect with the excess temperature test side (PRT) of power supply control integrated circuit.
6. current-mode power circuit according to claim 1, which is characterized in that the power supply controls integrated circuit packet
It includes:
Feedback voltage processing module, the Voltage Feedback processing module is for after handling feedback voltage and output error voltage；
Feedback current processing module after the feedback current processing module is used to handle feedback current voltage value and exports slope
Compensated Current Voltage；
Pwm comparator, the positive input terminal of the pwm comparator are connect with the output end of the feedback current processing module, institute
The negative input end for stating pwm comparator is connect with the output end of feedback current processing module, and the pwm comparator is used for according to institute
Current Voltage after stating error voltage and slope compensation generates pulse-width control signal；
Rest-set flip-flop, the end R of the rest-set flip-flop are connect with the pulse-width control signal output end of the pwm comparator；
Crystal oscillator, the crystal oscillator output end are connect with the end S of the rest-set flip-flop, for passing through the pulsewidth control
Signal processed triggers the pulse-width signal that the rest-set flip-flop generates the period；
Logic control module, the Logic control module are connect with the output end of the rest-set flip-flop, for controlling the period
Pulse-width signal output；
MOS drive module, the MOS drive module are connect with the Logic control module, in the Logic control module
Under the action of export the pulse-width signal.
7. current-mode power circuit according to claim 6, which is characterized in that the power supply control integrated circuit also wraps
It includes:
Security protection module, the security protection module are connect with the Logic control module, and the security protection module is used for
Safety detection, and safety detection information is transmitted to the Logic control module control module, pass through the Logic control module
Control the output of the pulse-width signal in the period.
8. current-mode power circuit according to claim 7, which is characterized in that the security protection module further include:
External excess temperature overvoltage protective module, the input terminal and the integrated electricity of power supply control of the external excess temperature overvoltage protective module
The excess temperature test side on road connects, and the output end of the external excess temperature overvoltage protective module is connect with the Logic control module.
9. current-mode power circuit according to claim 8, which is characterized in that the security protection module further include:
Any one or more in overcurrent protection module, overvoltage protective module or internal temperature protective module, the overcurrent protection mould
Block, overvoltage protective module or internal temperature protective module are connect with the Logic control module respectively.
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|---|---|---|---|
| CN201821995094.0U CN209233730U (en) | 2018-11-29 | 2018-11-29 | Current-mode power circuit |
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| CN201821995094.0U CN209233730U (en) | 2018-11-29 | 2018-11-29 | Current-mode power circuit |
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| CN209233730U true CN209233730U (en) | 2019-08-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276418A (en) * | 2022-08-17 | 2022-11-01 | 深圳市诚芯微科技股份有限公司 | High-frequency switching power supply circuit, switching power supply and switching unit |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276418A (en) * | 2022-08-17 | 2022-11-01 | 深圳市诚芯微科技股份有限公司 | High-frequency switching power supply circuit, switching power supply and switching unit |
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