CN106972766B - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN106972766B CN106972766B CN201710260491.7A CN201710260491A CN106972766B CN 106972766 B CN106972766 B CN 106972766B CN 201710260491 A CN201710260491 A CN 201710260491A CN 106972766 B CN106972766 B CN 106972766B
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 69
- 239000003990 capacitor Substances 0.000 claims description 33
- 238000007781 pre-processing Methods 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims 1
- 230000001131 transforming effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000010354 integration Effects 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- 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
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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- 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
- H02M1/36—Means for starting or stopping converters
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- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a power supply circuit, and relates to the technical field of electronics; the circuit comprises a rectifying circuit, an input filter circuit, an integrated circuit, a peak absorption circuit, a transformer, an output filter circuit and a peripheral circuit; the rectification circuit rectifies an input alternating current power supply, the input filter circuit outputs a direct current power supply after stabilizing and filtering the rectified power supply, the integrated circuit outputs a pulse modulation power supply, the peak absorption circuit absorbs peak high voltage of the pulse modulation power supply, the transformer outputs a power supply by transforming the pulse modulation power supply, and the output filter circuit carries out filtering and stabilizing on the power supply. The power supply circuit greatly reduces elements of the power supply circuit, and has simpler circuit structure.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a power supply circuit.
Background
The power adapter is an indispensable part of electronic products, the stability of the adapter directly influences the performance of electronic equipment, and the size of the electronic equipment influences the portability of the power adapter.
The existing adapter circuit has low integration level, the peripheral circuit of the pulse controller of the switching power supply is complex, the primary feedback circuit and the secondary feedback circuit are provided with complex separation circuits such as an optocoupler, a TL431 circuit and the like, the voltage and current detection circuit is complex, the size of the power supply circuit board is overlarge, the circuit is unstable due to the complex peripheral circuit, the material cost is increased, and the assembly production efficiency of the adapter is low.
Disclosure of Invention
In view of the above, an embodiment of the present invention provides a power circuit, which aims to solve the problem of low integration of the adapter circuit in the prior art. The technical scheme adopted by the embodiment of the invention is as follows:
an embodiment of the present invention provides a power supply circuit including:
the device comprises a rectifying circuit, an input filter circuit, an integrated circuit, a peak absorption circuit, a transformer, an output filter circuit and a peripheral circuit;
the rectification circuit is connected with the input filter circuit, the input filter circuit is connected with the integrated circuit, the integrated circuit is connected with the peak absorption circuit, the peak absorption circuit is connected with the transformer, and the transformer is connected with the output filter circuit;
the rectification circuit rectifies an input alternating current power supply, the input filter circuit outputs a direct current power supply after stabilizing and filtering the rectified power supply, the integrated circuit outputs a pulse modulation power supply, the peak absorption circuit absorbs peak high voltage of the pulse modulation power supply, the transformer outputs a power supply by transforming the pulse modulation power supply, and the output filter circuit carries out filtering and stabilizing on the power supply.
Further, the transformer is a double winding architecture.
Further, the integrated circuit comprises a high-voltage starting module, a self-power module, a current detection module, a pulse width modulation module, an oscillator module, a logic control module, a triggering module, a driving control module and a power triode;
the high-voltage starting module generates a constant-current starting power supply according to the output direct-current power supply to start the power triode;
the self-powered module is used for stabilizing the internal power supply of the integrated circuit;
the current detection module detects the output current of the power triode and outputs a current detection value to the pulse width modulation module;
the pulse width modulation module outputs a current detection value and a feedback voltage according to the current detection module;
-the oscillator module (350) generates an oscillating signal providing a synchronous clock for the integrated circuit;
the logic control module carries out logic judgment on the input signal and outputs a trigger control signal;
the triggering module triggers according to the triggering control signal and the oscillating signal and outputs a triggering signal to the driving control module;
the driving control module receives the trigger signal, outputs corresponding driving current voltage according to the trigger signal, and drives the power triode;
and the power triode outputs a corresponding pulse modulation power supply according to the driving current and the driving voltage.
Further, the integrated circuit further comprises an over-temperature protection module, an over-current protection module, an overload detection module, a short circuit detection module and a protection control module;
the over-temperature protection module is connected with the logic control module, the over-current protection module is respectively connected with the current detection module and the logic control module, the overload detection module is connected with the protection control module, the short circuit detection module is connected with the protection control module, and the protection control module is connected with the logic control module;
the over-temperature protection module detects the temperature of the integrated circuit, judges whether the temperature is too high, sends an over-temperature judgment result to the logic control module, judges short circuit judgment according to a current detection value of the current detection module, sends a short circuit judgment result to the logic control module, detects whether a load is overloaded, sends an overload detection result to the protection control module, detects whether the load is shorted, sends a short circuit detection result to the protection control module, and sends short circuit and overload judgment results to the logic control module according to the overload detection result and the short circuit detection result.
Further, the integrated circuit also comprises a feedback detection module and a working mode control module; the feedback detection module is connected with the working mode control module, and is used for detecting a load state and sending the load state to the working mode control module, and the working mode control module is used for switching the working mode according to the load state.
Further, the switching of the working mode is specifically to switch the working mode of the integrated circuit to a low switching frequency mode when the load state is light load or no load, so as to reduce the switching frequency of the power triode, thereby reducing the power loss of the power supply circuit.
Further, the integrated circuit also comprises a supply voltage protection module and a switch logic module; the power supply voltage protection module is respectively connected with the self-powered module and the switch logic module; the power supply voltage protection module detects and judges whether the internal power supply voltage of the integrated circuit is normal or not, and sends a power supply voltage judgment result to the switch logic module, and if the power supply voltage judgment result is abnormal, the switch logic module switches the integrated circuit again; otherwise, the power supply voltage is normal, and the integrated circuit does not need to be subjected to switch restarting operation.
Further, the integrated circuit further comprises a current collection preprocessing module, and the current collection preprocessing module preprocesses the output signal of the current detection module to ensure the stability of the output signal of the current detection module.
Further, the current collection preprocessing module comprises a front edge blanking module, and the front edge blanking module removes peak current when the circuit is on.
Further, the peripheral circuit comprises a first resistor, a sixth capacitor, a second resistor, a third resistor and a fourth resistor;
one end of the first resistor is connected with one end of the input filter circuit, and the other end of the first resistor is connected with the high-voltage starting module through an interface; one end of the sixth capacitor is connected with one end of the fourth resistor, and the other end of the sixth capacitor is connected with the self-powered module through an interface; the second resistor and the third resistor are mutually connected in series, the common end of the second resistor and the third resistor is connected with the pulse width modulation module through an interface, the other end of the second resistor is connected with one end of the fourth resistor, the other end of the third resistor is connected with the other end of the input filter circuit, and the other end of the fourth resistor is also connected with the peak absorption circuit;
the first resistor provides starting current for the high-voltage starting module, and the sixth capacitor charges and stabilizes the output voltage of the self-powered module; the second resistor and the third resistor divide the voltage of the direct current power supply and feed back the divided voltage value to the pulse width modulation module.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a power supply circuit, which integrates a pulse width modulation control module, a feedback loop, a self-powered circuit, a high-voltage start-up circuit, an oscillator and a logic control module into a whole through an integrated circuit, so that components are greatly reduced, the circuit structure is simpler, the circuit is simpler, the production cost is reduced, the integration level of the circuit is improved, the stability of the circuit is improved, the production and assembly are simpler, and the production efficiency is improved.
The self-powered technology directly obtains power from the high-voltage starting module, and auxiliary windings of the transformer are not needed for supplying power, so that the volume of the transformer is smaller, and the volume of the charger is reduced.
Drawings
Fig. 1 is a schematic diagram of a power circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of an integrated circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of another integrated circuit according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a current collection preprocessing module according to a second embodiment of the present invention.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Embodiment one:
referring to fig. 1, a schematic diagram of a power circuit according to an embodiment of the invention is shown.
The power supply circuit shown includes: a rectifying circuit 100, an input filter circuit 200, an integrated circuit 300, a spike absorbing circuit 400, a transformer 500, an output filter circuit 600, and a peripheral circuit 700;
the rectifying circuit 100 is connected to the input filter circuit 200, the input filter circuit 200 is connected to the integrated circuit 300, the integrated circuit 300 is connected to the peak absorbing circuit 400, the peak absorbing circuit 400 is connected to the transformer 500, and the transformer 500 is connected to the output filter circuit 600;
the rectification circuit 100 rectifies an input ac power, the input filter circuit 200 performs voltage stabilizing filtering on the rectified power, and then outputs a dc power, the integrated circuit 300 outputs a pulse modulation power, the peak absorption circuit 400 absorbs peak high voltage of the pulse modulation power, the transformer 500 transforms the pulse modulation power and outputs a power supply, and the output filter circuit 600 performs filtering voltage stabilizing on the power supply.
Preferably, in the implementation of the present invention, the rectifying circuit 100 is a bridge rectifying circuit; the bridge rectifier circuit rectifies the alternating current power supply by utilizing the unidirectional conductivity of the diode.
The input filter circuit 200 includes a first capacitor EC1, a second capacitor EC2, and a first inductor L1, where one end of the first capacitor EC1 is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to one end of the second capacitor EC 2; the first capacitor EC1, the second capacitor EC2 and the first inductor L1 form an LC filter circuit, and filter and stabilize the output dc power supply of the rectifier circuit 100, so as to provide a stable power supply for the integrated circuit 300.
The peak absorbing circuit 400 includes a sixth resistor R6, a third capacitor C2, a first diode D1, and a seventh resistor R7; the sixth resistor R6 and the third capacitor C2 are connected in parallel, one end of a common end of the sixth resistor R6 and one end of a common end of the third capacitor C2 are connected with the first diode D1, the other end of the common end of the sixth resistor R6 and the common end of the third capacitor C2 are connected with one end of the primary of the transformer 500, the other end of the first diode D1 is connected with one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected with the other end of the primary of the transformer 500.
And the sixth resistor R6 and the third capacitor C2 are mutually connected in parallel to form an RC filter circuit. Filtering the output dc power of the rectifying circuit 100, filtering the spike wave generated in the circuit, providing a pulse modulation power for the primary stage of the transformer 500, reducing the power loss generated by the pulse modulation power flowing to the negative electrode through the R6, and limiting the current of the spike voltage passing through the first diode D1 by the seventh resistor R7 to prevent the first diode D1 from being damaged.
The output filter circuit 600 includes an eighth resistor R8, a fourth capacitor C3, a second diode D2, a fifth capacitor EC3, and a ninth resistor R9;
one end of the eighth resistor R8 is connected to one end of the fourth capacitor C3, the other end of the eighth resistor R8 is connected to one secondary end of the transformer 500 and one end of the second diode D2, the other end of the second diode D2 is connected to the other end of the fourth capacitor C3 and one end of the fifth capacitor EC3 and one end of the ninth resistor R9, and the other end of the fifth capacitor EC3 and the other end of the ninth resistor R9 are connected to the other secondary end of the transformer 500.
The eighth resistor R8, the fourth capacitor C3 and the second diode D2 form a filter circuit, filter the output voltage of the transformer 500, and output the filtered power voltage, and the fifth capacitor EC3 and the ninth resistor R9 form a filter voltage stabilizing circuit, which is a power supply with stable output.
Preferably, in the embodiment of the present invention, the transformer 500 is a dual-winding architecture.
Referring to fig. 2, a schematic structure of an integrated circuit 300 according to an embodiment of the invention is shown.
The integrated circuit 300 includes a high voltage start-up module 310, a self-power module 320, a current detection module 330, a pulse width modulation module 340, an oscillator module 350, a logic control module 360, a trigger module 370, a drive control module 380, and a power transistor 390.
Referring to fig. 1 and 2, the peripheral circuit 700 includes a first resistor R1, a sixth capacitor C1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
one end of the first resistor R1 is connected with one end of the input filter circuit 200, and the other end is connected with the high-voltage starting module 310 through an interface; one end of the sixth capacitor C1 is connected to one end of the fourth resistor R4, and the other end is connected to the self-powered module 320 through an interface; the second resistor R2 and the third resistor R3 are connected in series, the common end of the second resistor R2 and the third resistor R3 is connected with the pulse width modulation module 340 through an interface, the other end of the second resistor R2 is connected with one end of the fourth resistor R4, the other end of the third resistor R3 is connected with the other end of the input filter circuit (200), and the other end of the fourth resistor R4 is also connected with the peak absorbing circuit 400;
the first resistor R1 provides a starting current for the high-voltage starting module 310, and the sixth capacitor C1 performs charging voltage stabilization on the output voltage of the self-power module 320; the second resistor R2 and the third resistor R3 divide the voltage of the dc power supply, and feed back the divided voltage value to the pwm module 340.
The high voltage starting module 310 generates a constant current starting power according to the output dc power to start the power transistor 390. More specifically, the high voltage starting module 310 generates a conducting constant current through the first resistor R1, the conducting constant current is added to the base electrode of the power triode 390 through the driving control module 380, so that the collector electrode and the emitter electrode of the power triode 390 are conducted, and the power triode 390 enters a conducting working state.
The self-powered module 320 stabilizes the internal power supply of the integrated circuit 300. More specifically, the self-power module 320 obtains a self-power supply from the high-voltage starting module 310, the self-power supply charges the sixth capacitor C1 after passing through the self-power module 320, and when the voltage value of the sixth capacitor C1 increases to the integrated circuit voltage VCC, the self-power module 320 stabilizes the voltage value of the sixth capacitor C1, so that the integrated circuit voltage VCC can normally provide a stable voltage to the integrated circuit 300.
The current detection module 330 detects the output current of the power triode 390 and outputs a current detection value to the pwm module 340, and the pwm module 340 outputs a pwm signal according to the current detection value of the current detection module 330 and a feedback voltage. More specifically, the second resistor R2 and the third resistor R3 divide the primary voltage of the transformer 500, and feed back the divided voltage value to the pwm module 340, and the pwm module compares the divided voltage value with the current detection value, and outputs a corresponding width pulse signal according to the comparison result.
In the implementation of the present invention, the outputting the corresponding width pulse information according to the comparison result specifically includes: when the feedback voltage value is greater than or equal to the current detection value, the pwm module 340 outputs a low level; when the feedback voltage is smaller than the current detection result, the pwm module 340 outputs a high level.
The oscillator module 350 generates an oscillating signal, which in the embodiment of the invention is a fixed frequency signal, which provides a synchronous clock for the integrated circuit 300.
The logic control module 360 performs logic judgment on the input logic signal and outputs a trigger control signal. More specifically, the logic control module 360 performs logic judgment on the pulse modulation signal and the oscillation signal or other abnormal signals, and outputs the trigger control signal to the trigger module 370 according to the logic judgment, and outputs a trigger signal to the trigger module 370.
The triggering module 370 triggers according to the triggering control signal and the oscillation signal, and outputs a triggering signal to the driving control module 380.
Preferably, in the embodiment of the present invention, the trigger control module adopts an RS trigger.
The driving control module 380 receives the trigger signal of the trigger module 370, and outputs a corresponding driving current voltage according to the trigger signal, so as to drive the power triode 390.
Preferably, in the embodiment of the present invention, the driving control module 380 uses a ramp current driving, so as to reduce the power consumption of the chip and improve the efficiency of the circuit.
The power transistor 390 outputs a corresponding pulse modulation power according to the driving current and voltage.
The pulse modulation power is added to the two ends of the primary of the transformer 500 after passing through the peak absorption circuit 400. The transformer 500 transforms the pulse modulated power and outputs through the secondary of the transformer 500.
Embodiments of the present invention provide a power supply circuit that is highly integrated with a pulse width modulation control module (PWM), a feedback loop, a self-powered circuit, a high voltage start-up, an oscillator, and a logic control module 360 through an integrated circuit 300. The circuit structure is simpler, the circuit is simpler, the production cost is reduced, the integration level of the circuit is improved, the stability of the circuit is improved, the production and assembly are simpler, and the production efficiency is improved.
The self-powered technology directly obtains power from the high-voltage starting module 310 without the auxiliary winding of the transformer 500, so that the volume of the transformer 500 is smaller, and the volume of the charger is reduced.
Embodiment two:
referring to fig. 3, another integrated circuit 300 according to an embodiment of the invention is shown. The present embodiment is further improved on the basis of the first embodiment.
The integrated circuit 300 also includes an exception protection module 3010.
The abnormality protection module comprises an over-temperature protection module 3011, an over-current protection module 3012, an overload detection module 3013, a short circuit detection module 3014 and a protection control module 3015;
the over-temperature protection module 3011 is connected to the logic control module 360, the over-current protection module 3012 is connected to the current detection module 330 and the logic control module 360, the overload detection module 3013 is connected to the protection control module 3015, the short circuit detection module 3014 is connected to the protection control module 3015, and the protection control module 3015 is connected to the logic control module 360;
the over-temperature protection module 3011 detects the temperature of the integrated circuit 300, determines whether the temperature is too high, and sends an over-temperature determination result to the logic control module 360, the over-current protection module 3012 performs short circuit determination according to the current detection value of the current detection module 330, and sends a short circuit determination result to the logic control module 360, the overload detection module 3013 detects whether the load is overloaded, and sends an overload detection result to the protection control module 3015, the short circuit detection module 3014 detects whether the load is shorted, and sends a short circuit detection result to the protection control module 3015, and the protection control module 3015 performs short circuit and overload determination according to the overload detection result and the short circuit detection result, and sends a short circuit and overload determination result to the logic control module 360.
Further, the integrated circuit 300 further comprises a supply voltage protection module 3020, a switching logic module 3030; the supply voltage protection module 3020 is connected to the self-powered module 320 and the switch logic module 3030 respectively; the supply voltage protection module 3020 detects and determines whether the internal supply voltage of the integrated circuit 300 is normal, and sends a supply voltage determination result to the switching logic module 3030, and if the supply voltage determination result is abnormal, the switching logic module 3030 performs switching restarting on the integrated circuit 300; otherwise, the power supply voltage is normal, and the integrated circuit 300 does not need to be subjected to a switch restarting operation.
In the embodiment of the invention, whether the internal power supply voltage normally comprises whether the internal power supply voltage is overvoltage or undervoltage or not.
Further, the integrated circuit 300 further includes a feedback detection module 3040, an operation mode control module 3050; the feedback detection module 3040 is connected with the working mode control module 3050, the feedback detection module 3040 detects a load state and sends the load state to the working mode control module 3050, and the working mode control module performs conversion of a working mode according to the load state.
The switching of the operation mode is specifically to switch the operation mode of the integrated circuit 300 to a low switching frequency mode when the load state is a light load or no load, so as to reduce the switching frequency of the power transistor 390, thereby reducing the power loss of the power circuit.
Further, the integrated circuit 300 further includes a current collecting and preprocessing module 3060, where the current collecting and preprocessing module 3060 preprocesses the output of the current detecting module 330, so as to ensure the stability of the output of the current detecting module 330.
Referring to fig. 4, a schematic structural diagram of the current collecting and preprocessing module 3060 according to an embodiment of the invention is illustrated.
The current collection preprocessing module 3060 comprises an audio noise suppression module 3061, wherein the audio noise suppression module 3061 suppresses audio noise during operation, and the audio noise during operation is less in interference to the pulse width adjustment device.
Further, the current collecting and preprocessing module 3060 further includes a front-edge blanking module 3062, and a high peak current is provided at the moment of circuit on due to the distributed capacitance of the switching transformer 500, so as not to cause malfunction of the circuit, and a front-edge blanking circuit is started to remove the peak current when the circuit is on. The leading edge blanking module 3062 eliminates the need for external RC filtering of the current sample input.
Further, the current acquisition pre-processing module 3060 also includes a slope compensation module 3063 that ensures stability of the integrated circuit 300 at low voltage and high power output.
Further, the current acquisition pre-processing module 3060 also includes an output line complement module 3064, the compensation current of the output line complement module 3064 increases linearly with increasing output load.
Further, the oscillator module 350 is provided with a dithering circuit (not shown), and the dithering circuit (not shown) ensures electromagnetic compatibility of the oscillator and ensures stability of the oscillation signal outputted from the oscillator module 350.
Further, the integrated circuit 300 also includes a soft start module 3070, the soft start module 3070 relieving electrical stress on the power supply during start-up. The integrated circuit 300 undergoes a soft start process each time it is restarted.
The embodiment is further improved on the basis of implementing one, and various protection, short circuit, open circuit, overload, over-temperature protection and other functions are integrated through the abnormal protection module.
By the supply voltage protection module 3020, the switch logic module 3030 protects the integrated circuit supply voltage, including overvoltage protection and undervoltage protection, and increases the supply stability of the integrated circuit 300.
The feedback detection module 3040 and the working mode control module 3050 are used for adjusting whether the load is in an idle load or light load state, so as to adjust the working mode of the integrated circuit 300, thereby reducing the power loss of the integrated circuit 300 under the condition that the integrated circuit 300 is in the idle load or light load state.
The current collection preprocessing module 3060 is used for suppressing the audio noise in operation, so that the interference of the audio noise in operation to the pulse width adjustment device is reduced.
The oscillator is ensured to be in electromagnetic compatibility through the frequency-jittering circuit, and the stability of the oscillating signal output by the oscillator is ensured.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (6)
1. A power supply circuit, comprising:
a rectifier circuit (100), an input filter circuit (200), an integrated circuit (300), a peak absorption circuit (400), a transformer (500), an output filter circuit (600), and a peripheral circuit (700);
the rectifying circuit (100) is connected with the input filter circuit (200), the input filter circuit (200) is connected with the integrated circuit (300), the integrated circuit (300) is connected with the peak absorbing circuit (400), the peak absorbing circuit (400) is connected with the transformer (500), and the transformer (500) is connected with the output filter circuit (600);
the rectification circuit (100) rectifies an input alternating current power supply, the input filter circuit (200) outputs a direct current power supply after stabilizing and filtering the rectified power supply, the integrated circuit (300) outputs a pulse modulation power supply, the peak absorption circuit (400) absorbs peak high voltage of the pulse modulation power supply, the transformer (500) carries out transformation on the pulse modulation power supply to output a power supply, and the output filter circuit (600) carries out filtering and stabilizing on the power supply;
the peripheral circuit (700) is respectively connected with the input filter circuit (200), the integrated circuit (300) and the peak absorbing circuit (400);
wherein,
the integrated circuit (300) comprises a high-voltage starting module (310), a self-power module (320), a current detection module (330), a pulse width modulation module (340), an oscillator module (350), a logic control module (360), a triggering module (370), a driving control module (380) and a power triode (390);
the high-voltage starting module (310) generates a constant-current starting power supply according to the output direct-current power supply to start the power triode (390);
the self-powered module (320) stabilizes an internal power supply of the integrated circuit (300);
the current detection module (330) detects the output current of the power triode (390) and outputs a current detection value to the pulse width modulation module (340);
the pulse width modulation module (340) outputs a pulse modulation signal according to the current detection value and the feedback voltage output by the current detection module (330);
-the oscillator module (350) generates an oscillating signal providing a synchronous clock for the integrated circuit (300);
the logic control module (360) carries out logic judgment on the input signal and outputs a trigger control signal;
the triggering module (370) triggers according to the triggering control signal and the oscillating signal, and outputs a triggering signal to the driving control module;
the driving control module (380) receives the trigger signal, outputs corresponding driving current voltage according to the trigger signal, and drives the power triode (390);
the power triode (390) outputs a corresponding pulse modulation power supply according to the driving current and the driving voltage;
the integrated circuit (300) further comprises a feedback detection module (3040) and an operating mode control module (3050); the feedback detection module (3040) is connected with the working mode control module (3050), the feedback detection module (3040) detects a load state and sends the load state to the working mode control module (3050), and the working mode control module (3050) performs working mode conversion according to the load state; the conversion of the working mode specifically comprises the following steps: when the load state is light load or no load, the working mode of the integrated circuit (300) is converted into a low switching frequency mode, and the switching frequency of the power triode (390) is reduced, so that the power loss of the power supply circuit is reduced;
wherein,
the integrated circuit (300) further comprises a supply voltage protection module (3020) and a switching logic module (3030);
the power supply voltage protection module (3020) is respectively connected with the self-powered module (320) and the switch logic module (3030);
the power supply voltage protection module (3020) detects and judges whether the internal power supply voltage of the integrated circuit (300) is normal, and sends a power supply voltage judgment result to the switch logic module (3030), and if the power supply voltage judgment result is abnormal, the switch logic module (3030) switches the integrated circuit (300) again; otherwise, the power supply voltage is normal, and the integrated circuit (300) does not need to be subjected to switch restarting operation.
2. The power supply circuit according to claim 1, characterized in that the transformer (500) is a double winding architecture.
3. The power supply circuit of claim 1, wherein the integrated circuit (300) further comprises an over-temperature protection module (3011), an over-current protection module (3012), an overload detection module (3013), a short circuit detection module (3014), and a protection control module (3015);
the over-temperature protection module (3011) is connected with the logic control module (360), the over-current protection module (3012) is respectively connected with the current detection module (330) and the logic control module (360), the overload detection module (3013) is connected with the protection control module (3015), the short circuit detection module (3014) is connected with the protection control module (3015), and the protection control module (3015) is connected with the logic control module (360);
the over-temperature protection module (3011) detects the temperature of the integrated circuit (300), judges whether the temperature is too high, and sends an over-temperature judgment result to the logic control module (360), the over-current protection module (3012) performs short circuit judgment according to the current detection value of the current detection module (330), and sends a short circuit judgment result to the logic control module (360), the overload detection module (3013) detects whether a load is overloaded, and sends an overload detection result to the protection control module (3015), the short circuit detection module (3014) detects whether the load is shorted, and sends a short circuit detection result to the protection control module (3015), and the protection control module (3015) performs short circuit and overload judgment according to the overload detection result and the short circuit detection result, and sends a short circuit and overload judgment result to the logic control module (360).
4. The power supply circuit of claim 1, wherein the integrated circuit (300) further comprises a current collection preprocessing module (3060), the current collection preprocessing module (3060) preprocessing the output signal of the current detection module (330) to ensure the stability of the output signal of the current detection module (330).
5. The power supply circuit of claim 4, wherein the current acquisition pre-processing module (3060) includes a leading edge blanking module (3062), the leading edge blanking module (3062) removing spike current when the circuit is on.
6. A power supply circuit according to claim 3, characterized in that the peripheral circuit (700) comprises a first resistor, a sixth capacitor, a second resistor, a third resistor and a fourth resistor;
one end of the first resistor is connected with one end of the input filter circuit (200), and the other end of the first resistor is connected with the high-voltage starting module (310) through an interface; one end of the sixth capacitor is connected with one end of the fourth resistor, and the other end of the sixth capacitor is connected with the self-powered module (320) through an interface; the second resistor and the third resistor are mutually connected in series, the common end of the second resistor and the third resistor is connected with the pulse width modulation module (340) through an interface, the other end of the second resistor is connected with one end of the fourth resistor, the other end of the third resistor is connected with the other end of the input filter circuit (200), and the other end of the fourth resistor is also connected with the peak absorbing circuit (400);
the first resistor provides starting current for the high-voltage starting module (310), and the sixth capacitor charges and stabilizes the output voltage of the self-power module (320); the second resistor and the third resistor divide the voltage of the direct current power supply and feed back the divided voltage value to the pulse width modulation module (340).
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| CN111130363A (en) * | 2019-10-17 | 2020-05-08 | 深圳市助尔达电子科技有限公司 | High-integration power converter |
| CN112271130A (en) * | 2020-10-27 | 2021-01-26 | 天津市英贝特航天科技有限公司 | Novel power supply for triple quadrupole mass spectrometer ion optical system |
| CN117435024B (en) * | 2023-12-19 | 2024-03-12 | 深圳市七彩虹禹贡科技发展有限公司 | Safe power supply control circuit of mainboard |
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