CN106877665A - The program control DC/DC power supplys of voltage-dropping type based on UC3843 - Google Patents
The program control DC/DC power supplys of voltage-dropping type based on UC3843 Download PDFInfo
- Publication number
- CN106877665A CN106877665A CN201510914809.XA CN201510914809A CN106877665A CN 106877665 A CN106877665 A CN 106877665A CN 201510914809 A CN201510914809 A CN 201510914809A CN 106877665 A CN106877665 A CN 106877665A
- Authority
- CN
- China
- Prior art keywords
- voltage
- power supplys
- program control
- dropping type
- type based
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- H02M3/33561—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 having more than one ouput with independent control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The program control DC/DC power supplys of voltage-dropping type based on UC3843, by single-ended forward converter circuit, DC/DC converter circuits and feedback element are constituted.The single-ended forward converter circuit, its transformer plays isolation and transformation；When primary voltage of transformer be timing, output diode forward bias, at this moment switching tube is in the conduction state.The program control DC/DC power supplys of voltage-dropping type based on UC3843,220V alternating currents are allowed to be changed into voltage to be changed into 24V through isolating after transformation and rectifying and wave-filtering, DC/DC power supplys are carried out by single-chip microcomputer it is program control, using current-control type PFM schemes, system effectiveness is greatly improved, simplifies circuit structure.
Description
Technical field
The program control DC/DC power supplys of voltage-dropping type the present invention relates to be based on UC3843.
Background technology
The use of electronics and relevant device is substantially all too busy to get away power supply, and the development level of power technology is also the important embodiment of electronic technology level.Therefore, study and design power-supply system tool and be of great significance.
The high energy consumption of power supply chip is, it is necessary to from transformer feed, increased circuit complexity, and reduce the operating efficiency of power supply.Because input voltage can only be 24V voltages, it is only suitable for the use of stationary applica-tions, such as armored vehicle, but can be limited during use in other respects.
The content of the invention
To solve the above problems, the present invention devises the program control DC/DC power supplys of voltage-dropping type based on UC3843.
The technical solution adopted for the present invention to solve the technical problems is：The program control DC/DC power supplys of voltage-dropping type based on UC3843 are made up of single-ended forward converter circuit, DC/DC converter circuits and feedback element.
The single-ended forward converter circuit, its transformer Tl plays isolation and transformation (noting the Same Name of Ends of transformer).When primary voltage of transformer be timing, output diode forward bias, at this moment switching tube is in the conduction state.And in inverse excitation type converter, when switching tube is turned off, diode is just turned on.
The DC/DC converter circuits, control CI uses pwm chip UC3843, using discontinuous current control type PFM schemes.The voltage that input voltage is produced after transformer is exported after rectified filtering again.DC/DC converter output terminals are by sampling resistor Rs2, collection output current signal I0.With output voltage V0Feeding feedback element is processed together.
The feedback element is made up of high speed amplifier LM358 and optocoupler.
The beneficial effects of the invention are as follows, the program control DC/DC power supplys of voltage-dropping type based on UC3843,220V alternating currents are allowed to be changed into voltage to be changed into 24V through isolating after transformation and rectifying and wave-filtering, DC/DC power supplys are carried out by single-chip microcomputer program control, using current-control type PFM schemes, system effectiveness is greatly improved, simplifies circuit structure.
Brief description of the drawings
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1 is single-ended forward converter circuit diagram.
Fig. 2 is the block diagram of system.
Specific embodiment
In Fig. 1, control section is mainly made up of Fuzzy Logic Cotroller with Single-chip Microcomputer and parameter self-tuning PID controller.
Control CI can drive electrical power metal-oxide-semiconductor using the general phase inverter 74HC14 or 74AC14 that have hysteresis to be input into, the input parallel connection of 5 tunnels, and feature is that power dissipation ratio power supply chip is low, can be fed without from transformer, so as to simplify circuit, improve efficiency.After upper electricity, A is high level in circuit, and B is low level, and switching tube Ml is closed, and R1 charges to C1；After C1 voltages reach CII upset high level, A is low level, and B is high level, switching tube M1 conductings, the trapezoidal increase because of the effect of outputting inductance L1 of sampling resistor RSI electric currents；When RSI voltages reach about 0.7V, transistor N1 conductings make C1 discharge, switching tube Ml shut-offs, i.e. Ml shut-offs are by its current control.The each ON time Ton of N1 are basically unchanged.When output voltage or electric current reach set-point, light misfortune 01 is turned on, and C1 electric discharges increase, and R1 increases to the charging interval (Toff) of C1, thus forms PFM modulation.Main topological main power consumption is the power consumption of switching tube MI, the power consumption of rectifying tube Dl, DZ, power consumption of transformer T1, the power consumption of outputting inductance L1 and control circuit etc., switching tube Ml can select the suitable metal-oxide-semiconductor of voltage, electric current, Dl/D2 selects the Ultrafast recovery diode or Schottky diode of 100V, T1 optimizes design, and control circuit then uses low-power chip, and selects the appropriate switching frequency can to improve efficiency.
In fig. 2, system is made up of the part such as DC/DC converters, single chip machine controlling circuit, backfeed loop, display circuit and keyboard and communication.Accessory power supply can be increased in system for the chip power supply in whole circuit.DC/DC converters are sampled to primary current, and PFM controls are realized by feedback loop, and the voltage and current to exporting is sampled, and double feedback regulations are realized by single chip machine controlling circuit.
CIUC3843 needs 12V to power；UC3843 reference voltages, can provide benchmark for chip vibration；R, C parameter for adjusting CI4 pin can obtain design frequency.Adjustment signal sends into CI1 pin by light misfortune receiving terminal, for UC3843 provides current limliting current potential：CI3 pin obtain MOS switch pipe drain current by sampling resistor, and the current limliting current potential with CII pin is compared, and form PFM modulation waveforms and are exported by CI6 pin；The PFM modulated signals of IC6 pin output control the switch of MOS switch pipe, and high frequency normal shock is produced in primary；It is to reduce interference, between CI1,2 pin and connects a filter capacitor；To prevent excitatory vibration, CI3 pin connect the electric capacity of 47pF over the ground.The small resistor of metal-oxide-semiconductor drain electrode plays current protection effect.To improve power-efficient, while protecting metal-oxide-semiconductor, an energy feedback branch road is devised in primary, primary unnecessary electricity in the course of work is fed back to and is input into power network；When negative voltage signal flyback comes, discharged to ground by diode D5 and the 8uF inductance of lower section；When positive signal voltage flyback comes, if the voltage that flyback comes is less than 24V, then discharged to ground by diode D4 and 10uF electric capacity, if greater than 24V, electricity is put into former power-supply system by diode D4 and inductance L then, plus an inductance L is primarily used to buffer flyback converter, in order to avoid big impact is caused to input power.The voltage that input voltage is produced after transformer is exported after rectified filtering again.DC/DC converter output terminals are by sampling resistor Rs2, collection output current signal I0.With output voltage V0Feeding feedback element is processed together.
It is made up of high speed amplifier LM358 and optocoupler.I0、V0It is the sampled value and output voltage of system output current；Iot, Vot are feedback current and feedback voltage level；Electric current and the setting value of voltage that Ios, Vos are given for single-chip microcomputer.Because output voltage Vo maximums are 5v, in order to protect singlechip chip, sampled voltage maximum is set as 4v by we, so Vo is compared by being re-fed into amplifier after ZK and SK electric resistance partial pressures.In addition, system output voltage Vo (partial pressure is because AD collections are 25V to the maximum) after two 1OK electric resistance partial pressures samplings, obtains feedback voltage level Vot, Chip Microcomputer A/D C interface, the sampled value I of system output current are sent directly into.After amplifying through amplifier Al standardization, feedback current Iot is obtained, be also fed into Chip Microcomputer A/D C interface, single-chip microcomputer collection feedback voltage and current signal, for DC/DC precision controllings.When input through keyboard setting value, with PWM forms output current and voltage setting value, two-way setting value is by after passive filtering for single-chip microcomputer, it is changed into d. c. voltage signal Ios and Vos, the in-phase input end of amplifier A2, A3 is connected to, as the reference voltage that voltage, current feedback are adjusted, works as Iot<During Ios, A3 is output as O, red light emitting diodes conducting；Work as Vot<During Vos, A2 is output as 0, green LED conducting.When LEDs ON, light misfortune transmitting terminal produces signal, bringing disaster upon receiving terminal control DC/DC converters by the light for being connected in the pin of UA3843 chips 1 carries out dynamic linear regulation, when Iot and Vot are all higher than being equal to ofs and Vos, system enters stabilization, reaches the double feedback stability adjustment effects of voltage, electric current.When load changes, Iot, Vot produce change, and its regulation process is consistent with said process.
Claims (4)
1. the program control DC/DC power supplys of voltage-dropping type of UC3843 are based on, and by single-ended forward converter circuit, DC/DC converter circuits and feedback element are constituted.
2. program control DC/DC power supplys of the voltage-dropping type based on UC3843 according to claim 1, it is characterized in that the single-ended forward converter circuit, its transformer Tl plays isolation and transformation；When primary voltage of transformer be timing, output diode forward bias, at this moment switching tube is in the conduction state.
3. program control DC/DC power supplys of the voltage-dropping type based on UC3843 according to claim 1, it is characterized in that C/DC converter circuits control CI uses pwm chip UC3843, using discontinuous current control type PFM schemes；The voltage that input voltage is produced after transformer is exported after rectified filtering again.
4. program control DC/DC power supplys of the voltage-dropping type based on UC3843 according to claim 1, it is characterized in that the feedback element is made up of high speed amplifier LM358 and optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510914809.XA CN106877665A (en) | 2015-12-13 | 2015-12-13 | The program control DC/DC power supplys of voltage-dropping type based on UC3843 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510914809.XA CN106877665A (en) | 2015-12-13 | 2015-12-13 | The program control DC/DC power supplys of voltage-dropping type based on UC3843 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106877665A true CN106877665A (en) | 2017-06-20 |
Family
ID=59237328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510914809.XA Pending CN106877665A (en) | 2015-12-13 | 2015-12-13 | The program control DC/DC power supplys of voltage-dropping type based on UC3843 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106877665A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964609A (en) * | 2018-08-24 | 2018-12-07 | 广东工业大学 | A kind of solar battery array simulator |
-
2015
- 2015-12-13 CN CN201510914809.XA patent/CN106877665A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964609A (en) * | 2018-08-24 | 2018-12-07 | 广东工业大学 | A kind of solar battery array simulator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102055357B (en) | Switch power supply controller circuit and switch power supply system | |
| CN102904448B (en) | Control chip of switch power supply and switch power supply | |
| CN102801314B (en) | Constant on-time switching regulator implementing dual control loops | |
| CN202435294U (en) | Pulse width modulation switch power supply controller and switch power supply | |
| CN104682745A (en) | Isolated voltage conversion circuit, control circuit and control method thereof | |
| CN103702486A (en) | LED driving circuit system, control circuit and control method | |
| CN203722871U (en) | LED drive circuit system and LED drive control circuit | |
| CN103023337B (en) | Power circuit of switching power converter | |
| CN104242620A (en) | system with ripple suppression circuit and ripple suppression method thereof | |
| CN203086823U (en) | Non-isolated LED driving circuit without auxiliary winding power supply | |
| CN104467437A (en) | Low stand-by power consumption switching power supply | |
| CN103458557A (en) | LED drive control circuit and LED lamp | |
| CN102801310B (en) | Direct-current switch power supply circuit | |
| CN103647448B (en) | Integrated step-down-flyback type high power factor constant current circuit and device | |
| CN109617429A (en) | Voltage converter ic, high pressure BUCK converter and control method | |
| CN209419502U (en) | Power supply circuit, control circuit and Switching Power Supply | |
| CN103025021B (en) | Step-down light emitting diode (LED) drive circuit based on electrical inductance discharge time modulation | |
| CN204517684U (en) | Isolated voltage conversion circuit and control circuit | |
| CN204578367U (en) | A kind of Switching Power Supply of BOOST circuit topological structure | |
| CN103796389B (en) | High-high brightness hoisting module, controllable silicon light modulation LED drive circuit and system | |
| CN203445602U (en) | Flyback overvoltage protection circuit | |
| CN204258608U (en) | Ripple suppression circuit and circuit system comprising same | |
| CN206628988U (en) | Inverse-excitation type voltage-stabilizing switch power source | |
| CN203574903U (en) | High-power factor constant current control circuit and LED lighting equipment | |
| CN203352471U (en) | Photovoltaic inverter-used single end flyback-type switching power supply primary-side circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170620 |