CN111193412A - Automatic uninterrupted power supply dual power supply system - Google Patents
Automatic uninterrupted power supply dual power supply system Download PDFInfo
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- CN111193412A CN111193412A CN202010085351.2A CN202010085351A CN111193412A CN 111193412 A CN111193412 A CN 111193412A CN 202010085351 A CN202010085351 A CN 202010085351A CN 111193412 A CN111193412 A CN 111193412A
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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
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
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- 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
- H02H7/1213—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 DC-DC converters
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- 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
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- 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
- H02H7/1252—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 responsive to overvoltage in input or output, e.g. by load dump
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an automatic uninterrupted power supply dual-power supply system, which comprises a protection unit, a rectification filter unit, a push-pull unit, a transformer T3, a rectification filter unit II, an execution unit, a voltage feedback unit, a current feedback unit and an MCU chip IC4, wherein the input end of the protection unit is connected with a mains supply, the protection unit, the rectification filter unit, the push-pull unit, the transformer T3, the rectification filter unit II and the execution unit are sequentially connected, the output end of the execution unit is connected with a load, the execution unit is also connected with the input end of the MCU chip IC4 through a voltage acquisition unit, the output end of the MCU chip IC4 is connected with the execution unit, and the rectification filter unit II is also connected with the MCU chip IC4 through a constant voltage unit to supply power to an MCU chip IC 4; the invention has high safety, high adaptability, a feedback unit, stable output and good market application value.
Description
Technical Field
The invention relates to the field of switching power supplies, in particular to an automatic uninterrupted power supply dual-power supply system.
Background
A Switch Mode Power Supply (SMPS), also called a switching Power Supply and a switching converter, is a high-frequency Power conversion device, and is a kind of Power Supply. The function is to convert a level voltage into a voltage or current required by the user terminal through different types of architectures. The input of the switching power supply is mostly an ac power supply (e.g., commercial power) or a dc power supply, and the output is mostly equipment requiring a dc power supply, such as a personal computer, and the switching power supply performs voltage and current conversion between the two.
When the existing switching power supply supplies power to a load, the load cannot be subjected to constant voltage and constant current output when voltage or current fluctuation is caused, the large load cannot be subjected to forced high-voltage output, the adaptability is not strong, current collection and voltage collection cannot be provided, and the load cannot be subjected to the effect of an automatic disconnection protection system during overload.
The prior art has defects and needs to be improved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an automatic uninterrupted power supply dual-power supply system.
The invention provides a technical scheme, in particular to an automatic uninterrupted power supply dual-power supply system which is characterized by comprising a protection unit, a rectifying and filtering unit, a push-pull unit, a transformer T3, a rectifying and filtering unit II, an execution unit, a voltage feedback unit, a current feedback unit and an MCU chip IC4, wherein the input end of the protection unit is connected with a mains supply, the protection unit, the rectifying and filtering unit, the push-pull unit, the transformer T3, the rectifying and filtering unit II and the execution unit are sequentially connected, the output end of the execution unit is connected with a load, the execution unit is also connected with the input end of the MCU chip IC4 through a voltage acquisition unit, the output end of the MCU chip IC4 is connected with the execution unit, the rectifying and filtering unit II is also connected with the MCU chip IC4 through a constant voltage unit to supply power to the MCU chip IC4, the rectifying and filtering unit is also connected with the push-pull unit through the voltage feedback, the voltage feedback unit and the current feedback unit perform feedback regulation on the push-pull unit, so that the switching frequency of the push-pull unit is changed, the duty ratio of the input side of the transformer T3 is further changed, and the MCU chip IC4 acquires a voltage value through the voltage acquisition unit and controls the execution unit to act.
Preferably, the protection unit comprises a fuse F1, a piezoresistor MOV1, a resistor R32, a resistor R37, a capacitor CX1, a common mode inductor T1 and a common mode inductor T2, the fuse F1 is connected in series with the input end of the live wire L of the commercial power, the rear end of the fuse F1, the voltage dependent resistor MOV1 is connected between the live wire L and the zero wire N of the commercial power, the rear end of the voltage dependent voltage MOV1, the resistor R32 and the resistor R37 are connected in series between the live wire L and the zero wire N, the rear ends of the resistor R32 and the resistor R37, the capacitor CX1 is connected between the live wire L and the zero line N, the rear end of the capacitor CX1, the live wire L and the zero line N are connected to the input side of the common mode inductor T2, two ends of the input side of the common mode inductor are respectively connected with the ground through a capacitor CY1 and a capacitor CY2, two sides of the output side of the common mode inductor are respectively connected with two ends of the input side of the common mode inductor T1, and two ends of the output side of the common mode inductor T1 are connected with the rectifying and filtering unit; through the protection unit, high frequency interference and equipment interference are suppressed, namely, the equipment is prevented from being interfered by the high frequency interference of a mains supply power grid, and meanwhile, the power grid is prevented from being interfered by the fluctuation of the equipment.
Preferably, the rectifying and filtering unit comprises a rectifying bridge BD1 and a filtering capacitor C2, two ends of the output side of the common-mode inductor T1 are respectively connected with two ends of the input side of the rectifying bridge BD1, one end of the output side of the rectifying bridge BD1 is connected with a primary ground, the other end of the output side of the rectifying bridge BD1 is connected with the primary ground through a capacitor C2, and the rectifying bridge BD1 is set to be a full bridge and the type thereof is set to be KBL 206.
Preferably, the push-pull unit comprises a power driving chip IC1 and an NMOS tube Q3, the model of the power driving chip IC1 is OB2269, the other end of the output side of the rectifier bridge BD1 is connected with the 3 pin of the power driving chip IC1 through a series resistor R22 and a resistor R23, the 1 pin of the power driving chip IC1 is connected with a primary ground, the 2 pin of the power driving chip IC 92 is connected with the primary ground through a light receiver IC3B of the photocoupler, a resistor R28 is further connected in series between the 2 pin of the power driving chip IC1 and the light receiver IC3B of the photocoupler, a capacitor C13 is connected between the 2 pin of the power driving chip IC1 and the primary ground for filtering, the 4 pin of the power driving chip IC 42 is connected with the primary ground through a resistor R3, the 5 pin of the power driving chip IC1 is connected with the primary ground through a thermistor 1, the 6 pin of the power driving chip IC 5 is connected with the source electrode of the NMOS tube Q3 through a resistor R30, and the 6 pin of the power driving chip IC1 is connected to the primary ground through a capacitor C15, the 7 pin of the power driving chip IC1 is connected to the high potential end of the secondary coil L4 of the transformer T3 through a reverse diode D3, the low potential end of the secondary coil L4 is connected to the primary ground, a resistor R7 is connected between the 7 pin of the power driving chip IC1 and the diode D3, the 7 pin of the power driving chip IC1 is connected to the primary ground through capacitors C10 and C8 respectively to perform a filtering operation, the 8 pin of the power driving chip IC1 is connected to the gate of the NMOS transistor Q3 through series resistors R26 and R27, and the gate of the NMOS transistor Q3 is connected to the middle end of the resistor R26 and the resistor R27 through a forward diode D7.
Preferably, the source of the NMOS transistor Q3 is connected to the primary ground through resistors R33 and R38 connected in parallel, the drain of the NMOS transistor Q3 is connected to the low potential end of the primary coil L2 of the transformer T3, the other end of the output side of the rectifier bridge BD1 is connected to the high potential end of the primary coil L2 of the transformer T3, the high potential end of the primary coil L2 of the transformer T3 is connected to the cathode of the diode D20 through resistors R5 and R20 connected in series, the high potential end of the primary coil L20 of the transformer T20 is connected to the cathode of the diode D20 through resistors R20 and R20 connected in series, the high potential end of the primary coil L20 of the transformer T20 is connected to the cathode of the diode D20 through capacitors C20, resistors R20 and R20 connected in series, and the cathode of the diode D20 is connected to the drain of the NMOS transistor Q20.
Preferably, the transformer T3 is a four-winding transformer, and the four winding coils are a primary coil L1, L2 and a secondary coil L3, L4.
Preferably, a high potential end of a secondary winding L3 of the transformer T3 is connected to an input end of the second rectifying and filtering unit, a low potential end of a primary winding L2 of the transformer T3 is connected to a secondary ground, the rectifying and filtering unit is composed of a diode D1, a diode D4, capacitors C6, C6 and C6, an anode of the diode D6 and an anode of the diode D6 are both connected to the high potential end of the secondary winding L6 of the transformer T6, a cathode of the diode D6 is connected to a cathode of the diode D6, a cathode of the diode D6 is connected to the secondary ground through the capacitors C6, C6 and C6, respectively, a high potential end of the primary winding L6 of the transformer T6 is connected to a cathode of the diode D6 through parallel resistors R6 and R6, and a cathode of the diode D6 is further connected to a cathode of the capacitor C6, namely, and a cathode V + of the diode D6 is connected between the diode D6 and a cathode of the diode D6.
Preferably, the power supply indicating unit further comprises a light emitting diode LDE1 and a light emitting diode LED2, wherein the anode of the light emitting diode LDE1 is connected with the output end of the MCU chip IC4 through a resistor R43, the light emitting diode LED2 is connected with the output end of the MCU chip IC4 through a resistor R44, and the cathodes of the light emitting diode LED1 and the light emitting diode LED2 are connected with a secondary ground.
Preferably, the constant voltage output unit further comprises a constant voltage output unit, the constant voltage output unit comprises a zener diode ZD1 and a diode D8, the anode of the diode D8 is connected to the high potential end of the secondary winding L3 of the transformer T3, the cathode of the diode D8 is connected to the cathode of the zener diode ZD1 through a resistor R29, the anode of the zener diode ZD1 is connected to the secondary ground, the cathode of the diode D8 is connected to the secondary ground through a capacitor C14, and the cathode of the zener diode ZD1 is a constant voltage output end and constantly outputs 3.3V voltage.
Preferably, the primary ground and the secondary ground are connected through a capacitor CY 3.
Compared with the prior art, the constant-current and constant-voltage control circuit has the advantages that the voltage feedback unit, the current feedback unit and the push-pull unit are arranged, so that the constant-current and constant-voltage adjustment of the switching power supply is realized, and the load is output constantly; by arranging the execution unit, when the switching power supply is abnormal, such as overcurrent or overvoltage, the MCU chip IC4 controls the execution unit to cut off the load, so that the switching power supply and the load are protected; the single chip microcomputer realizes high-voltage output to a large load by forcibly controlling the current feedback unit, so that the adaptability of the switching power supply is enhanced; the current and voltage acquisition is realized by arranging the current acquisition end and the voltage acquisition unit, so that the single chip microcomputer can operate the execution unit and protect the load and the switching power supply; the invention has high safety, high adaptability, a feedback unit, stable output and good market application value.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention 1;
FIG. 2 is a circuit diagram of a protection unit according to the present invention;
FIG. 3 is a circuit diagram of a rectifying and filtering unit and a push-pull unit according to the present invention;
FIG. 4 is a circuit diagram of a second rectifying and filtering unit, an execution unit, a voltage feedback unit, a current feedback unit, a constant voltage output unit and a voltage acquisition unit according to the present invention;
FIG. 5 is a circuit diagram of the constant voltage unit and the power indication unit of the present invention;
FIG. 6 is a schematic diagram of the MCU chip IC4 according to the present invention.
Detailed Description
The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. 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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
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 in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, an automatic uninterrupted power supply dual power supply system comprises a protection unit, a rectification filter unit, a push-pull unit, a transformer T3, a rectification filter unit II, an execution unit, a voltage feedback unit, a current feedback unit and an MCU chip IC4, wherein the input end of the protection unit is connected with a mains supply, the protection unit, the rectification filter unit, the push-pull unit, the transformer T3, the rectification filter unit II and the execution unit are sequentially connected, the output end of the execution unit is connected with a load, the execution unit is also connected with the input end of the MCU chip IC4 through a voltage acquisition unit, the output end of the MCU chip IC4 is connected with the execution unit, the rectification filter unit II is also connected with the MCU chip IC4 through a constant voltage unit to supply power to the MCU chip IC4, the rectification filter unit is also connected with the push-pull unit through the voltage feedback unit and the current feedback unit respectively, the voltage feedback unit and the current feedback unit perform feedback regulation on the push-pull unit, so that the switching frequency of the push-pull unit is changed, the duty ratio of the input side of the transformer T3 is further changed, and the MCU chip IC4 acquires a voltage value through the voltage acquisition unit and controls the execution unit to act.
As shown in fig. 2, the protection unit includes a fuse F1, a voltage dependent resistor MOV1, a resistor R32, a resistor R37, a capacitor CX1, a common mode inductor T1 and a common mode inductor T2, the fuse F1 is connected in series with the input end of the live wire L of the commercial power, the rear end of the fuse F1, the voltage dependent resistor MOV1 is connected between the live wire L and the zero wire N of the commercial power, the rear end of the voltage dependent voltage MOV1, the resistor R32 and the resistor R37 are connected in series between the live wire L and the zero wire N, the rear ends of the resistor R32 and the resistor R37, the capacitor CX1 is connected between the live wire L and the zero line N, the rear end of the capacitor CX1, the live wire L and the zero line N are connected to the input side of the common mode inductor T2, two ends of the input side of the common mode inductor are respectively connected with the ground through a capacitor CY1 and a capacitor CY2, two sides of the output side of the common mode inductor are respectively connected with two ends of the input side of the common mode inductor T1, and two ends of the output side of the common mode inductor T1 are connected with the rectifying and filtering unit; through the protection unit, high frequency interference and equipment interference are suppressed, namely, the equipment is prevented from being interfered by the high frequency interference of a mains supply power grid, and meanwhile, the power grid is prevented from being interfered by the fluctuation of the equipment.
As shown in fig. 3, the rectifying and filtering unit includes a rectifying bridge BD1 and a filtering capacitor C2, two ends of the output side of the common mode inductor T1 are respectively connected to two ends of the input side of the rectifying bridge BD1, one end of the output side of the rectifying bridge BD1 is connected to the primary ground, the other end of the output side of the rectifying bridge BD1 is connected to the primary ground through a capacitor C2, and the rectifying bridge BD1 is set to be a full bridge and the model thereof is set to KBL 206.
The push-pull unit comprises a power driving chip IC1 and an NMOS tube Q3, the model of the power driving chip IC1 is OB2269, the other end of the output side of the rectifier bridge BD1 is connected with the 3 pin of the power driving chip IC1 through a series resistor R22 and a resistor R23, the 1 pin of the power driving chip IC1 is connected with a primary ground, the 2 pin of the power driving chip IC1 is connected with the primary ground through a light receiver IC3B of a photocoupler, a resistor R28 is further connected in series between the 2 pin of the power driving chip IC1 and the light receiver IC3B of the photocoupler, a capacitor C13 is connected between the 2 pin of the power driving chip IC1 and the primary ground for filtering, the 4 pin of the power driving chip IC 42 is connected with the primary ground through a resistor R3, the 5 pin of the power driving chip IC1 is connected with the primary ground through an RT1, the 6 pin of the power driving chip IC 5 is connected with the source of the NMOS tube Q3 through a resistor R30, and the 6 pin of the power driving chip IC1 is connected to the primary ground through a capacitor C15, the 7 pin of the power driving chip IC1 is connected to the high potential end of the secondary coil L4 of the transformer T3 through a reverse diode D3, the low potential end of the secondary coil L4 is connected to the primary ground, a resistor R7 is connected between the 7 pin of the power driving chip IC1 and the diode D3, the 7 pin of the power driving chip IC1 is connected to the primary ground through capacitors C10 and C8 respectively to perform a filtering operation, the 8 pin of the power driving chip IC1 is connected to the gate of the NMOS transistor Q3 through series resistors R26 and R27, and the gate of the NMOS transistor Q3 is connected to the middle end of the resistor R26 and the resistor R27 through a forward diode D7.
When the internal temperature of the power driving chip IC1 gradually rises due to some factor, the thermistor RT1 is affected by the temperature rise, the resistance value of the power supply driving chip IC1 is gradually reduced, so that the voltage of the 5 pin of the power supply driving chip IC1 is gradually reduced until the voltage of the 5 pin of the power supply driving chip IC1 is reduced to below 1.065V and lasts for 100us, the 8 pins of the power driving chip IC1 stop driving, and the NMOS tube Q3 is closed, so that the whole system is protected; when the internal temperature of the power driving chip IC1 gradually decreases, the thermistor RT1 is affected by the temperature decrease, the resistance value of the power supply driving chip IC is gradually increased, so that the voltage of the 5 pin of the power supply driving chip IC1 is gradually increased, and the output of the power supply driving chip IC1 is automatically recovered after the voltage of the 5 pin of the power supply driving chip IC1 is increased to 1.165V and lasts for 100us, and the system is recovered to normal operation.
The source of the NMOS transistor Q3 is connected to the primary ground through resistors R33 and R38 connected in parallel, the drain of the NMOS transistor Q3 is connected to the low potential end of the primary coil L2 of the transformer T3, the other end of the output side of the rectifier bridge BD1 is connected to the high potential end of the primary coil L2 of the transformer T3, the high potential end of the primary coil L2 of the transformer T3 is connected to the negative electrode of the diode D20 through resistors R5 and R20 connected in series, the high potential end of the primary coil L20 of the transformer T20 is connected to the high potential end of the diode D20, the high potential end of the primary coil L20 of the transformer T20 is connected to the negative electrode of the diode D20 through a resistor R20 and a resistor R20 connected in series, the high potential end of the primary coil L20 of the transformer T20 is connected to the negative electrode of the diode D20 through a capacitor C20, a resistor R20 and a drain of the diode D20.
The transformer T3 is a four-winding transformer, and the four winding coils are a primary coil L1 and a primary coil L2, and a secondary coil L3 and a secondary coil L4.
As shown in fig. 4, a high potential end of a secondary winding L3 of the transformer T3 is connected to an input end of a second rectifier filter unit, a low potential end of a primary winding L2 of the transformer T3 is connected to a secondary ground, the second rectifier filter unit is composed of a diode D1, a diode D4, capacitors C6, C6 and C6, an anode of the diode D6 and an anode of the diode D6 are both connected to the high potential end of the secondary winding L6 of the transformer T6, a cathode of the diode D6 is connected to a cathode of the diode D6, a cathode of the diode D6 is connected to a secondary ground through the capacitors C6, C6 and C6, a high potential end of the primary winding L6 of the transformer T6 is connected to a cathode of the diode D6 through parallel resistors R6 and R6, and a cathode of the diode D6 is connected to a cathode of the capacitor C6, namely, a cathode of the diode D6V 6.
The voltage feedback unit comprises a voltage stabilizing chip U1, a potentiometer RP1 and a triode Q2, wherein the model of the voltage stabilizing chip U1 is TL431, the negative electrode of the voltage stabilizing chip U1 is connected with the ground, the positive electrode of the voltage stabilizing chip U1 is a voltage feedback point, the voltage feedback point is connected with the control end of the voltage stabilizing chip U1 through a series resistor and a capacitor C5, the control end of the voltage stabilizing chip U1 is connected with the power supply V + through a resistor R3, the control end of the voltage stabilizing chip U1 is connected with the ground through a resistor R13, one end and the sliding end of the potentiometer RP1 are both connected with the control end of the voltage stabilizing chip U1, the other end of the potentiometer RP1 is connected with the ground through a resistor R17, the control end of the voltage stabilizing chip U1 is also connected with the collector of the triode Q2 through a resistor R14, the emitter of the triode Q2 is connected with the ground, the base of the triode Q2 is connected with the ground through a resistor R19, and the base electrode of the triode Q2 is connected with the output end of the MCU chip IC4 through a resistor R11.
The current feedback unit is provided with an operational amplifier IC2A and a detection resistor JR1, one end of the detection resistor JR1 is connected with the secondary ground, the other end of the detection resistor JR1 is connected with the low potential end of the voltage stabilizing chip U1, the inverting input end of the operational amplifier IC2A is connected with the secondary ground through a detection resistor JR1, a resistor R25 is further connected between the inverting input end of the operational amplifier IC2A and the detection resistor JR1, the inverting input end of the operational amplifier IC2A is connected with the input end of an MCU chip IC4, the inverting input end of the operational amplifier IC2A is used as a current collecting end and is collected by the MCU chip IC4, the inverting input end of the operational amplifier IC2A is connected with the secondary ground through a capacitor C16, the inverting input end of the operational amplifier IC 25 is connected with the output end of the operational amplifier IC2A through a capacitor C57323, the inverting input end of the operational amplifier IC2A is connected with the output end of the operational amplifier IC2 through a resistor R24 and a capacitor C, the non-inverting input terminal of the operational amplifier IC2A is connected with a reference voltage through a resistor R31, the non-inverting input terminal of the operational amplifier IC2A is connected with a secondary ground through a resistor R34 and a resistor R35 which are connected in parallel, and the output terminal of the operational amplifier IC2A is a current feedback point.
The voltage feedback point is connected to the low potential end of the light emitting source IC3A of the photoelectric coupler through a reverse diode D9, the current feedback point is connected to the low potential end of the light emitting source IC3A of the photoelectric coupler through a reverse diode D10, the high potential end of the light emitting source IC3A of the photoelectric coupler is connected to the power supply V +, the high potential end of the light emitting source IC3A of the photoelectric coupler is connected to the power supply V + through a resistor R40, and the power supply V + is connected to the low potential end of the light emitting source IC3A of the photoelectric coupler through a resistor R39.
When the voltage of a power supply V + is too high, the voltage at the control end of the voltage stabilizing chip U1 is increased and exceeds the voltage of 2.5V, the high potential end and the low potential end of the voltage stabilizing chip U1 are conducted, the voltage of a voltage feedback point is pulled low and is at a low potential, a light emitting source IC3A of the photoelectric coupler is conducted to emit light, a light receiver IC3B of the photoelectric coupler receives light, an internal triode of the photoelectric coupler is conducted, the potential of a pin 2 of the power supply driving chip IC1 is connected low, and the power supply driving chip IC1 controls the switching frequency of a pin 8 to reduce the duty ratio and achieve the purpose of reducing the voltage; when the load power is too high, the output voltage needs to be increased, the conduction of the triode Q2 is controlled by the MCU chip IC4, the control end voltage of the voltage stabilizing chip U1 is forcibly pulled down and is lower than 2.5V, the high potential end and the low potential end of the voltage stabilizing chip U1 are not conducted, the voltage of a voltage feedback point is at a high potential, the light emitting source IC3A of the photoelectric coupler is not conducted and does not emit light, the light receiver IC3B of the photoelectric coupler is not conducted, the triode in the photoelectric coupler is not conducted, the potential of the 2 pin of the power driving chip IC1 is at a high potential, and the power driving chip IC1 controls the switching frequency of the 8 pin, increases the duty ratio and achieves the purpose of reducing the pulled high voltage.
The execution unit comprises a relay K1 and a triode Q1, one end of a switch of the relay K1 is connected to the negative electrode of the diode D1, the other end of the relay switch is used as the positive electrode connected with a load interface, one end of a coil of the relay K1 is connected with one end of a switch of the relay K1, the other end of a coil of the relay K1 is connected with a collector of the triode Q1, the diode D5 is reversely connected between one end of the coil of the relay K1 and the collector of the triode Q1, an emitter of the triode Q1 is grounded, a base of the triode Q1 is connected with the output end of the MCU chip IC4 through a resistor R11, and a base of the triode Q1 is grounded through a resistor R19.
The MCU chip IC4 controls the on-off of the triode Q1 by outputting high level/low level, and further controls the coil of the relay K1 to be powered on or powered off, so as to control the on-off of the switch of the relay K1.
Furthermore, the rear side of the execution unit is further provided with a voltage acquisition unit, the voltage acquisition unit is used for acquiring a voltage value output by the execution unit, the voltage acquisition unit comprises a diode D2, a resistor R9 and a resistor R16, the anode of the diode D2 is connected with the anode of the load interface, the cathode of the diode D2 is connected with the secondary ground through a resistor R9 and a resistor R16 which are connected in series, the middle ends of the resistors R9 and R16 are connected with the input end of the MCU chip IC4 and used for acquiring a voltage value after voltage division, and the cathode of the diode D2 is connected with the middle end of the resistor R9 and the resistor R16 which are connected in series through a resistor R10.
Further, the reference voltage is provided by a voltage regulation chip U2, the model of the voltage regulation chip U2 is TL431, the high potential end of the voltage regulation chip U2 is connected to the power supply V + through a resistor R41, the low potential end of the voltage regulation chip U2 is connected to the secondary ground, a resistor R42 is connected between the high potential end and the control end of the voltage regulation chip U2, and the control end of the voltage regulation chip U2 is connected to the secondary ground through a resistor R45, so that the control end of the voltage regulation chip U2 is the reference voltage 2.5V.
As shown in fig. 5, the constant voltage unit is further provided with a voltage follower IC2B, the non-inverting input terminal of the voltage follower IC2B is connected to the secondary ground through a capacitor C19, the non-inverting input terminal of the voltage follower IC2B is connected to the high potential terminal of the voltage stabilization chip U2, the inverting input terminal of the voltage follower IC2B is connected to the output terminal of the voltage follower IC2B, the power supply terminal of the voltage follower IC2B is connected to the power supply V +, the ground terminal of the voltage follower IC2B is connected to the secondary ground, the output terminal of the voltage follower IC2B is connected to the low potential terminal of the primary coil L1 of the transformer T3, the high potential terminal of the primary coil L1 of the transformer T3 is connected to the power supply terminal of the MCU chip IC4, and the high potential terminal of the primary coil L1 of the transformer T3 is connected to the secondary ground through a capacitor C17 and a capacitor C18 which are connected in parallel; the circuit in which the output voltage of the voltage follower IC2B is not affected by the impedance of the subsequent stage has an isolation function, even though the circuit of the previous stage and the circuit of the subsequent stage are not affected by each other.
Such as operational amplifier IC2A and voltage follower IC2B are two channels of a dual operational amplifier, such as a dual operational amplifier model set to LM 358.
Further, the power supply indicating unit comprises a light emitting diode LDE1 and a light emitting diode LED2, wherein the anode of the light emitting diode LDE1 is connected with the output end of the MCU chip IC4 through a resistor R43, the light emitting diode LED2 is connected with the output end of the MCU chip IC4 through a resistor R44, and the cathodes of the light emitting diode LED1 and the light emitting diode LED2 are connected with secondary ground.
Further, the constant voltage output unit comprises a voltage stabilizing diode ZD1 and a diode D8, wherein the anode of the diode D8 is connected to the high potential end of the secondary coil L3 of the transformer T3, the cathode of the diode D8 is connected to the cathode of the voltage stabilizing diode ZD1 through a resistor R29, the anode of the voltage stabilizing diode ZD1 is connected to the secondary ground, the cathode of the diode D8 is connected to the secondary ground through a capacitor C14, and the cathode of the voltage stabilizing diode ZD1 is a constant voltage output end and constantly outputs 3.3V voltage.
The primary ground and the secondary ground are connected by a capacitor CY 3.
As shown in fig. 6, the model of the MCU chip IC4 is not particularly limited, for example, the model of the MCU chip IC4 is set to DS80C320 and STC12C5205 AD.
The working principle of the invention is as follows: the commercial power is subjected to interference suppression through the protection unit, is rectified and filtered through the rectifying and filtering unit, and is converted into direct current of nearly 310V, the push-pull unit is matched with the transformer T3 to change the on-off duty ratio, the direct current is converted into alternating current, the alternating current passes through the rectifying and filtering unit II to form direct current to be supplied to a load, a primary side coil L1 of the transformer T3 is used for supplying power to the MCU chip IC4, a secondary side coil L3 of the transformer T3 is used for supplying power to the load, a secondary side coil L4 of the transformer T3 is used for supplying power to the push-pull unit, the execution unit is used for controlling the on-off of the whole circuit and the load, the voltage feedback unit and the current feedback unit are used for monitoring the voltage and the current of a loop of the load and feeding the voltage and the current back to the push-pull unit to form constant, the voltage is transmitted to the MCU chip IC4, the MCU chip IC4 performs corresponding actions, such as the disconnection of a relay K1 of the control execution unit, the protection system or the forced high-voltage output, the loading capacity is improved, the power supply indication unit indicates the working state and is in an abnormal state or a normal state, and the constant-voltage output unit provides an interface for constant-voltage output and is used by other loads.
The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides an automatic uninterrupted power supply dual supply power supply system, its characterized in that, including protection unit, rectification filter unit, push-pull unit, transformer T3, rectification filter unit two, execution unit, voltage feedback unit, current feedback unit and MCU chip IC4, the commercial power is connected to protection unit's input, protection unit, rectification filter unit, push-pull unit, transformer T3, rectification filter unit two and execution unit connect gradually, the load is connected to execution unit's output, execution unit still connects through voltage acquisition unit MCU chip IC 4's input, MCU chip IC 4's output is connected execution unit, rectification filter unit two still is connected with MCU chip IC4 through constant voltage unit, supplies power to MCU chip IC4, rectification filter unit still respectively through voltage feedback unit and current feedback unit with push-pull unit is connected, the voltage feedback unit and the current feedback unit perform feedback regulation on the push-pull unit, so that the switching frequency of the push-pull unit is changed, the duty ratio of the input side of the transformer T3 is further changed, and the MCU chip IC4 acquires a voltage value through the voltage acquisition unit and controls the execution unit to act.
2. The automatic uninterruptible power supply dual power supply system according to claim 1, wherein the protection unit includes a fuse F1, a varistor MOV1, a resistor R32, a resistor R37, a capacitor CX1, a common mode inductor T1 and a common mode inductor T2, the fuse F1 is connected in series to an input end of a live line L of a commercial power, a rear end of the fuse F1, a varistor MOV1 is connected between the live line L and a neutral line N of the commercial power, a rear end of the varistor MOV1, a resistor R32 and a resistor R37 are connected in series between the live line L and the neutral line N, a rear end of the resistor R32 and a rear end of the resistor R37, a capacitor CX1 is connected between the live line L and the neutral line N, a rear end of the capacitor CX1, the live line L and the neutral line N are connected to input sides of the common mode inductor T2, two ends of the input sides of the common mode inductor are respectively connected to the ground through a capacitor CY1 and a capacitor CY2, two sides of an output side of the common mode inductor T, both ends of the output side of the common-mode inductor T1 are connected with the rectifying and filtering unit; through the protection unit, high frequency interference and equipment interference are suppressed, namely, the equipment is prevented from being interfered by the high frequency interference of a mains supply power grid, and meanwhile, the power grid is prevented from being interfered by the fluctuation of the equipment.
3. The automatic uninterruptible power supply dual-power supply system as claimed in claim 2, wherein the rectifying and filtering unit includes a rectifying bridge BD1 and a filtering capacitor C2, two ends of the output side of the common mode inductor T1 are respectively connected to two ends of the input side of the rectifying bridge BD1, one end of the output side of the rectifying bridge BD1 is connected to the primary ground, the other end of the output side of the rectifying bridge BD1 is connected to the primary ground through a capacitor C2, and the rectifying bridge BD1 is configured as a full bridge and has a model number of KBL 206.
4. The system of claim 3, wherein the push-pull unit comprises a power driving chip IC1 and an NMOS tube Q3, the model of the power driving chip IC1 is OB2269, the other end of the output side of the rectifier bridge BD1 is connected with the 3 pin of a power driving chip IC1 through a series resistor R22 and a resistor R23, the 1 pin of the power driving chip IC1 is connected with a primary ground, the 2 pin of the power driving chip IC1 is connected with the primary ground through a light receiver IC3B of a photocoupler, a resistor R28 is further connected between the 2 pin of the power driving chip IC1 and a light receiver IC3B of the photocoupler, a capacitor C13 is connected between the 2 pin of the power driving chip IC1 and the primary ground for filtering, the 4 pin of the power driving chip IC1 is connected with the primary ground through a resistor R3, the 5 pin of the power driving chip IC1 is connected with the primary ground through a thermistor RT1, the 6 pin of the power driving chip IC1 is connected to the source of the NMOS transistor Q3 through a resistor R30, the 6 pin of the power driving chip IC1 is connected to a primary ground through a capacitor C15, the 7 pin of the power driving chip IC1 is connected to the high potential end of the secondary coil L4 of the transformer T3 through a reverse diode D3, the low potential end of the secondary coil L4 is connected to the primary ground, a resistor R7 is connected between the 7 pin of the power driving chip IC1 and a diode D3, the 7 pin of the power driving chip IC1 is connected to the primary ground through capacitors C10 and C8, respectively, so as to perform a filtering operation, the 8 pin of the power driving chip IC1 is connected to the gate of the NMOS transistor Q3 through series resistors R26 and R27, and the gate of the NMOS transistor Q3 is connected to the middle end of the resistor R26 and the resistor R27 through a positive diode D7.
5. The automatic uninterruptible power supply dual-power supply system as claimed in claim 4, wherein the source of the NMOS transistor Q3 is connected to the primary ground through resistors R33 and R38 connected in parallel, the drain of the NMOS transistor Q3 is connected to the low potential end of the primary coil L2 of the transformer T3, the other end of the output side of the rectifier bridge BD1 is connected to the high potential end of the primary coil L2 of the transformer T3, the high potential end of the primary coil L2 of the transformer T3 is connected to the negative pole of the diode D6 through resistors R5 and R20 connected in series, the high potential end of the primary coil L2 of the transformer T3 is connected to the high potential end of the primary coil L2 of the transformer T3 through a resistor R6 and a resistor R6 connected in series, the high potential end of the primary coil L6 of the transformer T6 is connected to the negative pole of the diode D6 through a capacitor C6, a resistor R6 and a resistor R6 connected in series, the cathode of the diode D6 is connected with the drain of the NMOS transistor Q3.
6. The system of claim 5, wherein the transformer T3 is a four-winding transformer, and the four windings are a primary winding L1, L2 and a secondary winding L3, L4.
7. An automatic uninterruptedly powered dual power supply system as claimed in claim 6, wherein a high potential end of a secondary winding L3 of the transformer T3 is connected to an input terminal of a second rectifier filter unit, a low potential end of a primary winding L2 of the transformer T3 is connected to a secondary ground, the rectifier filter unit is composed of a diode D1, a diode D4, capacitors C6, C9, C4 and C7, an anode of the diode D1 and an anode of the diode D4 are connected to the high potential end of the secondary winding L3 of the transformer T3, a cathode of the diode D1 is connected to a cathode of the diode D4, a cathode of the diode D1 is connected to the secondary ground through capacitors C6, C9, C4 and C7, respectively, and a high potential end of a primary winding L2 of the transformer T3 is connected to a cathode of the diode D1 through parallel resistors R1 and R2, and a cathode of the diode R1 and R2 is further connected to a capacitor C1 of the diode D1, the cathode of the diode D1 is the power supply V +.
8. The automatic uninterruptible power supply dual-power supply system as claimed in claim 7, further comprising a power indication unit, wherein the power indication unit comprises a light emitting diode LDE1 and a light emitting diode LED2, an anode of the light emitting diode LDE1 is connected to an output end of the MCU chip IC4 through a resistor R43, the light emitting diode LED2 is connected to an output end of the MCU chip IC4 through a resistor R44, and cathodes of the light emitting diode LED1 and the light emitting diode LED2 are both connected to a secondary ground.
9. The automatic uninterruptible power supply dual-power supply system as claimed in claim 8, further comprising a constant voltage output unit, including a zener diode ZD1 and a diode D8, wherein the anode of the diode D8 is connected to the high potential end of the secondary winding L3 of the transformer T3, the cathode of the diode D8 is connected to the cathode of the zener diode ZD1 through a resistor R29, the anode of the zener diode ZD1 is connected to the secondary ground, the cathode of the diode D8 is connected to the secondary ground through a capacitor C14, and the cathode of the zener diode ZD1 is a constant voltage output end, and constantly outputting a voltage of 3.3V.
10. An automatic uninterruptedly powered dual power supply system as claimed in claim 9, wherein the primary ground and the secondary ground are connected through a capacitor CY 3.
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| CN112019059A (en) * | 2020-08-26 | 2020-12-01 | 深圳市安众电气有限公司 | UV-LED power supply multi-path control circuit |
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