CN105871216A - Switch power supply circuit based on UC2843 - Google Patents
Switch power supply circuit based on UC2843 Download PDFInfo
- Publication number
- CN105871216A CN105871216A CN201610461421.3A CN201610461421A CN105871216A CN 105871216 A CN105871216 A CN 105871216A CN 201610461421 A CN201610461421 A CN 201610461421A CN 105871216 A CN105871216 A CN 105871216A
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- Prior art keywords
- circuit
- voltage
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- resistance
- feedback
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- 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
- H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
Abstract
The invention discloses a switch power supply circuit based on UC2843. The switch power supply circuit comprises a UC2843 chip circuit, a PWM control circuit, a voltage transformation circuit and a voltage output circuit. The switch power supply circuit is characterized by comprising a current feedback circuit and a voltage feedback circuit, wherein the voltage feedback circuit is used for detecting output voltage of the voltage output circuit and feeding back to a voltage feedback pin VFB of the UC2843 chip circuit, so as to control the pulse duty factor of the PWM control circuit; under the action of the current feedback circuit and the voltage feedback circuit, stable voltage can be output from the voltage output circuit. According to the switch power supply circuit based on UC2843, output voltage feedback of voltage type control can be set up, current feedback of an inductance coil is increased, and the current feedback is taken as slope parameters of a PWM control convertor, so that a sawtooth generator is not needed, the system response speed is rapid, the linear adjusting rate is high in precision, and the requirement of high precision of voltage-stabilized power supply can be easily met.
Description
Technical field
The present invention relates to a kind of switching power circuit, in particular, particularly relate to a kind of switching power circuit based on UC2843 being provided with coil current feedback circuit and output voltage feedback control circuit.
Background technology
Switching Power Supply is to utilize modern power electronics technology, controls the time ratio that switching tube turns on and off, and maintains a kind of power supply of burning voltage output.Switching Power Supply represents the developing direction of regulated power supply, has become the main product of regulated power supply.Traditional Switching Power Supply mostly uses voltage mode control, i.e. only samples output voltage, and realizes closed loop control as feedback signal, with regulated output voltage.But system low-response, is extremely difficult to higher line regulation precision.
Summary of the invention
The present invention is for the shortcoming overcoming above-mentioned technical problem, it is provided that a kind of switching power circuit based on UC2843.
The switching power circuit based on UC2843 of the present invention, including UC2843 chip circuit, pwm control circuit, transforming circuit and voltage follower circuit, the on off operating mode of the primary coil of transforming circuit is controlled by the output of UC2843 chip circuit through pwm control circuit, and the output of the secondary coil of transforming circuit is connected on voltage follower circuit；It is characterized in that: include voltage follower circuit is carried out current feedback circuit and the voltage feedback circuit of voltage stabilizing, electric current in the primary coil of transforming circuit is detected and feeds back to the current detecting pin ISEN of UC2843 chip circuit by current feedback circuit, to be controlled the break-make of pwm control circuit by output pin OUT；The output voltage of voltage follower circuit is detected and feeds back to the Voltage Feedback pin VFB of UC2843 chip circuit, to control the pulse duty factor of pwm control circuit by voltage feedback circuit；Under the common effect of current feedback circuit and voltage feedback circuit, make the voltage that voltage follower circuit output is stable.
The switching power circuit based on UC2843 of the present invention, described transforming circuit is made up of transformator T1, and the primary coil of transforming circuit is winding A, and secondary coil is winding B and winding C；Described pwm control circuit is made up of metal-oxide-semiconductor Q1, the pulse output pin OUT of UC2843 chip circuit is connected on the grid of metal-oxide-semiconductor Q1, the drain electrode of Q1 is connected with winding A and is followed by input voltage vin, the source electrode of Q1 is connected with resistance R9 and is followed by power supply on the ground, the current detecting pin ISEN of UC2843 chip circuit is connected between the source electrode of resistance R9 and Q1, to realize current feedback.
The switching power circuit based on UC2843 of the present invention, described voltage follower circuit is made up of diode D2, three-terminal voltage-stabilizing pipe D4, inductance L1, resistance R3 and resistance R8, one end of inductance L1 forms output end vo ut, the other end is connected to the different name end of winding C through diode D2, and the Same Name of Ends of winding C is connected on the ground；It is parallel with filtering and the electric capacity C4 and electric capacity C6 of pressure stabilization function between output end vo ut and ground, between diode D2 and the junction of inductance L1 and ground, is parallel with filtering and the electric capacity C3 and electric capacity C5 of pressure stabilization function；Two ends after resistance R3 connects with resistance R8 are connected between output end vo ut and ground respectively, and the reference edge of stabilivolt D4 is connected between resistance R8 and R3, by arranging the resistance value of resistance R8 Yu R3, to form the satisfactory stable voltage output Vout of size.
The switching power circuit based on UC2843 of the present invention, described voltage feedback circuit is made up of photoelectrical coupler U2, the negative electrode of the light emitting diode of U2 is connected to the outfan of stabilivolt D4, the anode of the light emitting diode of U2 is connected to the junction of inductance L1 and diode D2 through resistance R2, the colelctor electrode of the phototriode of U2 is connected to the Voltage Reference pin VREF of UC2843 chip circuit, the emitter stage of the phototriode of U2 is connected to the VFB pin of UC2843 chip circuit and is connected to power supply on the ground through the parallel circuit of resistance R6 and electric capacity C9 composition, it is achieved Voltage Feedback.
The invention has the beneficial effects as follows: the switching power circuit based on UC2843 of the present invention, the on off operating mode of transforming circuit primary coil is controlled by UC2843 chip circuit by pwm control circuit, it is achieved the purpose of voltage follower circuit output burning voltage；Current feedback circuit, by the size of electric current in detection transforming circuit primary coil, feeds back to the current detecting pin ISEN of UC2843 chip circuit, it is achieved that the Current Feedback Control of output voltage；Voltage feedback circuit is by the size of photoelectrical coupler detection output end vo ut, and testing result is inputted the Voltage Feedback pin VFB to UC2843 chip circuit, it is achieved that the Voltage Feedback of output voltage controls.Therefore, the switching power circuit based on UC2843 of the present invention, both the output voltage feedback of voltage mode control it had been provided with, add again the current feedback of inductance coil, current feedback is just as the ramp parameter of pwm controlled converter, thus not at needs sawtooth generator, makes system response time fast, line regulation precision is high, it is easy to meet the high-precision requirement to regulated power supply.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the switching power circuit based on UC2843 of the present invention；
Fig. 2 is the circuit diagram of the switching power circuit based on UC2843 of the present invention.
In figure: 1 UC2843 chip circuit, 2 pwm control circuits, 3 transforming circuits, 4 voltage follower circuits, 5 current feedback circuits, 6 voltage feedback circuits.
Detailed description of the invention
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, give the schematic diagram of the switching power circuit based on UC2843 of the present invention, it is made up of UC2843 chip circuit 1, pwm control circuit 2, transforming circuit 3, voltage follower circuit 4, current feedback circuit 5 and voltage feedback circuit 6, the on off operating mode of the primary coil of transforming circuit 3 is controlled by the output of UC2843 chip circuit 1 through pwm control circuit 2, and then controls the voltage swing of transforming circuit 3 output.The voltage that transforming circuit 3 is exported by voltage follower circuit 4 carries out rectification, filtering, to form galvanic current pressure output.
Shown current feedback circuit 5 is for detecting in transforming circuit 3 size of electric current in primary coil, and is fed back in UC2843 chip circuit 1, it is achieved Current Feedback Control.Voltage feedback circuit 6 is for detecting the size of voltage follower circuit 4 output voltage, and is fed back in UC2843 chip circuit 1, it is achieved Voltage Feedback controls.
As shown in Figure 2, give the circuit diagram of the switching power circuit based on UC2843 of the present invention, shown UC2843 chip circuit 1 is made up of UC2843 chip and peripheral circuit thereof, its RT/CT draws foot meridian capacitor C12 and is connected to power supply on the ground, also it is connected with its VREF pin through resistance R5, the loop of electric capacity C12 and resistance R5 composition determines the operating frequency of UC2843 chip, and operating frequency passes through formula f=1.8/(R5*C12) calculate.Shown pwm control circuit 2 is made up of metal-oxide-semiconductor Q1, and the grid of the output pin OUT and metal-oxide-semiconductor Q1 of UC2843 chip is connected, in order to the on off operating mode of Q1 is controlled by the pulse signal of OUT pin output.
Shown transforming circuit 3 is made up of transformator T1, the primary coil of T1 is winding A, secondary coil is winding B and winding C, the Same Name of Ends of winding A is connected in input voltage vin, different name is terminated in the drain electrode of metal-oxide-semiconductor Q1, the source electrode of metal-oxide-semiconductor Q1 is connected to power supply on the ground through current sense resistor R9, and meanwhile, the source electrode of Q1 is also connected on the current detecting pin ISEN of UC2843 chip.So, the current switching in primary coil winding A not only can be controlled by metal-oxide-semiconductor Q1, flows through the size of electric current in winding A also by resistance R9 detection, and feeds back in UC2843 chip, forms closed-loop current control.In work process; metal-oxide-semiconductor Q1 opens so that having electric current to pass through in resistance R9; when current is excessive; input the input in the same direction crossing stream comparator to UC2843 chip internal; when reaching 1V such as the dividing potential drop on R9, cross stream comparator action, make metal-oxide-semiconductor Q1 turn off by the PWM latch of UC2843 chip internal; realize Current Feedback Control, reach overcurrent protection function.
Being additionally provided with electric capacity C1 and electric capacity C2 between input voltage vin and power supply ground, to realize filtering and pressure stabilization function, the two ends of shown winding A are also associated with diode D1, during to realize metal-oxide-semiconductor Q1 shutoff, provide drain passageway for winding A.Shown winding B provides stable running voltage through diode D3 to the power end VCC of UC2843 chip, to ensure the normal work of UC2843 chip.
Shown voltage follower circuit 4 is made up of diode D2, stabilivolt D4, resistance R8, resistance R3 and inductance L1.One end of inductance L1 forms voltage output end Vout, and the other end is connected to the different name end of winding C through diode D2, and electric capacity C5, C3 are connected between diode D2 and inductance L1 junction and ground, and electric capacity C6, C4 are connected between voltage output end Vout and ground.Resistance R8 and resistance R3 connects and is followed by between voltage output end Vout and ground, and the reference edge of stabilivolt D4 is connected between resistance R8 and resistance R3.The reference voltage of stabilivolt D4 is 2.5V, then voltage output end Vout is asked for by formula Vout=2.4* (R3+R8)/R8.
Shown voltage feedback circuit 6 is made up of photoelectrical coupler U2, the negative electrode of the light emitting diode in photoelectrical coupler U2 is connected to the outfan of stabilivolt D4, anode is connected to the junction of inductance L1 and diode D2 through resistance R2 so that the change of output voltage can control the change of lumination of light emitting diode amount in U2.The emitter stage of the photosensitive triode of shown U2 is connected to power supply on the ground through resistance R6, is connected to the VFB pin of UC2843 chip.The colelctor electrode of phototriode is connected on the Voltage Feedback pin VFB of UC2843 chip, to realize Voltage Feedback control.
When the magnitude of voltage of output end vo ut output is bigger than normal, regulate through stabilivolt D4, the electric current of the light emitting diode flowing through U2 increases, and the lumination of light emitting diode amount of U2 increases so that the electric current in the phototriode of U2 increases, and then the magnitude of voltage of feedback voltage V FB is increased, feedback voltage compares with the reference voltage 2.5V of the error amplifier of UC2843 chip internal, produces error voltage, the voltage close loop within composition, to reduce the dutycycle of outfan, the voltage of outfan is made to reduce.Otherwise, when the magnitude of voltage of output end vo ut output is less than normal, the electric current of the light emitting diode flowing through U2 reduces, and the luminous quantity of the light emitting diode of U2 reduces so that the electric current in the phototriode of U2 reduces, and then the magnitude of voltage of feedback voltage V FB is reduced, feedback voltage compares with the reference voltage 2.5 of the error amplifier of UC2843 chip internal, produces error voltage, the voltage close loop within composition, to increase the dutycycle of outfan, the voltage of outfan is made to increase；Realize the closed loop control of voltage, by the voltage stabilization of outfan in setting value.
Claims (4)
1. a switching power circuit based on UC2843, including UC2843 chip circuit (1), pwm control circuit (2), transforming circuit (3) and voltage follower circuit (4), the on off operating mode of the primary coil of transforming circuit is controlled by the output of UC2843 chip circuit through pwm control circuit, and the output of the secondary coil of transforming circuit is connected on voltage follower circuit；It is characterized in that: include voltage follower circuit is carried out current feedback circuit (5) and the voltage feedback circuit (6) of voltage stabilizing, electric current in the primary coil of transforming circuit is detected and feeds back to the current detecting pin ISEN of UC2843 chip circuit by current feedback circuit, to be controlled the break-make of pwm control circuit by output pin OUT；The output voltage of voltage follower circuit is detected and feeds back to the Voltage Feedback pin VFB of UC2843 chip circuit, to control the pulse duty factor of pwm control circuit by voltage feedback circuit；Under the common effect of current feedback circuit and voltage feedback circuit, make the voltage that voltage follower circuit output is stable.
Switching power circuit based on UC2843 the most according to claim 1, it is characterised in that: described transforming circuit (3) is made up of transformator T1, and the primary coil of transforming circuit is winding A, and secondary coil is winding B and winding C；Described pwm control circuit (2) is made up of metal-oxide-semiconductor Q1, the pulse output pin OUT of UC2843 chip circuit (1) is connected on the grid of metal-oxide-semiconductor Q1, the drain electrode of Q1 is connected with winding A and is followed by input voltage vin, the source electrode of Q1 is connected with resistance R9 and is followed by power supply on the ground, the current detecting pin ISEN of UC2843 chip circuit is connected between the source electrode of resistance R9 and Q1, to realize current feedback.
Switching power circuit based on UC2843 the most according to claim 2, it is characterized in that: described voltage follower circuit (4) is made up of diode D2, three-terminal voltage-stabilizing pipe D4, inductance L1, resistance R3 and resistance R8, one end of inductance L1 forms output end vo ut, the other end is connected to the different name end of winding C through diode D2, and the Same Name of Ends of winding C is connected on the ground；It is parallel with filtering and the electric capacity C4 and electric capacity C6 of pressure stabilization function between output end vo ut and ground, between diode D2 and the junction of inductance L1 and ground, is parallel with filtering and the electric capacity C3 and electric capacity C5 of pressure stabilization function；Two ends after resistance R3 connects with resistance R8 are connected between output end vo ut and ground respectively, and the reference edge of stabilivolt D4 is connected between resistance R8 and R3, by arranging the resistance value of resistance R8 Yu R3, to form the satisfactory stable voltage output Vout of size.
Switching power circuit based on UC2843 the most according to claim 3, it is characterized in that: described voltage feedback circuit (6) is made up of photoelectrical coupler U2, the negative electrode of the light emitting diode of U2 is connected to the outfan of stabilivolt D4, the anode of the light emitting diode of U2 is connected to the junction of inductance L1 and diode D2 through resistance R2, the colelctor electrode of the phototriode of U2 is connected to the Voltage Reference pin VREF of UC2843 chip circuit, the emitter stage of the phototriode of U2 is connected to the VFB pin of UC2843 chip circuit and is connected to power supply on the ground through the parallel circuit of resistance R6 and electric capacity C9 composition, realize Voltage Feedback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610461421.3A CN105871216A (en) | 2016-06-23 | 2016-06-23 | Switch power supply circuit based on UC2843 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610461421.3A CN105871216A (en) | 2016-06-23 | 2016-06-23 | Switch power supply circuit based on UC2843 |
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| Publication Number | Publication Date |
|---|---|
| CN105871216A true CN105871216A (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610461421.3A Pending CN105871216A (en) | 2016-06-23 | 2016-06-23 | Switch power supply circuit based on UC2843 |
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| Country | Link |
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| CN (1) | CN105871216A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160498A (en) * | 2016-08-31 | 2016-11-23 | 重庆佩特电气有限公司 | Double feedback multi-output switch power sources for Variable-pitch Controller |
| CN109510479A (en) * | 2018-12-17 | 2019-03-22 | 厦门市科力电子有限公司 | A kind of feed circuit for Switching Power Supply |
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| CN102739057A (en) * | 2011-04-12 | 2012-10-17 | 新能微电子股份有限公司 | Primary/secondary double feedback control flyback power converter |
| CN104734510A (en) * | 2013-12-20 | 2015-06-24 | 比亚迪股份有限公司 | Switch power supply and control chip thereof |
| CN204578367U (en) * | 2015-05-13 | 2015-08-19 | 湖北大学 | A kind of Switching Power Supply of BOOST circuit topological structure |
| CN205693567U (en) * | 2016-06-23 | 2016-11-16 | 山东神戎电子股份有限公司 | Switching power circuit based on UC2843 |
-
2016
- 2016-06-23 CN CN201610461421.3A patent/CN105871216A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102739057A (en) * | 2011-04-12 | 2012-10-17 | 新能微电子股份有限公司 | Primary/secondary double feedback control flyback power converter |
| CN104734510A (en) * | 2013-12-20 | 2015-06-24 | 比亚迪股份有限公司 | Switch power supply and control chip thereof |
| CN204578367U (en) * | 2015-05-13 | 2015-08-19 | 湖北大学 | A kind of Switching Power Supply of BOOST circuit topological structure |
| CN205693567U (en) * | 2016-06-23 | 2016-11-16 | 山东神戎电子股份有限公司 | Switching power circuit based on UC2843 |
Non-Patent Citations (1)
| Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160498A (en) * | 2016-08-31 | 2016-11-23 | 重庆佩特电气有限公司 | Double feedback multi-output switch power sources for Variable-pitch Controller |
| CN109510479A (en) * | 2018-12-17 | 2019-03-22 | 厦门市科力电子有限公司 | A kind of feed circuit for Switching Power Supply |
| CN109510479B (en) * | 2018-12-17 | 2019-10-11 | 厦门市科力电子有限公司 | A kind of feed circuit for Switching Power Supply |
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Application publication date: 20160817 |
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