CN201563062U - Power supply device capable of automatically controlling output voltage based on UC3844 - Google Patents
Power supply device capable of automatically controlling output voltage based on UC3844 Download PDFInfo
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- CN201563062U CN201563062U CN2009201010787U CN200920101078U CN201563062U CN 201563062 U CN201563062 U CN 201563062U CN 2009201010787 U CN2009201010787 U CN 2009201010787U CN 200920101078 U CN200920101078 U CN 200920101078U CN 201563062 U CN201563062 U CN 201563062U
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Abstract
The utility model provides a power supply device capable of automatically controlling an output voltage based on UC3844, which comprises the following three units: a main power unit, a feedback-control unit and a driving unit, wherein the feedback-control unit generates a PWM wave by detecting the output voltage and the driving unit controls the switching time of the main power unit, thereby achieving the desired voltage output. The power supply device belongs to the technical field of automatic control and is particularly used in the high-power switching power source of the electric power system to ensure normal power supply to the control chip, the blower fan and other equipment. The power supply device capable of automatically controlling the output voltage based on UC3844 has the characteristics of reliable performance, low price and the like.
Description
Technical field
The utility model belongs to a kind of power supply power supply technique, is specifically related to a kind of automatic control output voltage technology.
Background technology
In the high power switching power supply that electric power system is used, the needed DC power supply of chip, major part is all provided by Industrial Frequency Transformer, increase along with the output way, it is very huge that the volume of transformer becomes, and output voltage also can change along with the variation of input, influential to chip performance, thereby influence the output-index of whole Switching Power Supply, and the small-power switching power-supply of using multichannel output for its power supply just can be successful avoid the problems referred to above.The automatic control output voltage technology of this paper introduction is just for realizing what this function designed.
Summary of the invention
The purpose of this utility model is to provide a kind of dependable performance, the cheap automatic control output voltage electric supply installation based on the UC3844 realization.
The purpose of this utility model is achieved in that main power section, feedback-control section, drive part, main power section is connected feedback-control section respectively with drive part, control section is to be core by UC3844, comprise error amplifier compensator, light-coupled isolation, PWM output and feedback inlet, the feedback inlet is connected with light-coupled isolation.Control section comprises the error amplification compensator and the optical coupling isolator of connection, and optical coupling isolator connects the control chip part.Main power section power tube MOSFET, power inverter, rectifier diode, filter capacitor and three terminal regulator are formed, input voltage is for connecting power tube MOSFET, power tube MOSFET connects power inverter, and power inverter connects rectifier diode, and rectifier diode connects filtered electrical; Filter capacitor connects three terminal regulator, and three terminal regulator connects control section by feedback.Drive part comprises the complementary follower of emitter-base bandgap grading, high-frequency pulse transformer, current-limiting resistance, voltage stabilizing didoe, and the complementary follower of emitter-base bandgap grading connects high-frequency pulse transformer, and high-frequency pulse transformer connects current-limiting resistance, and current-limiting resistance connects voltage stabilizing didoe.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is main power circuit figure of the present utility model;
Fig. 3 is feedback of the present utility model-control circuit figure;
Fig. 4 is drive circuit figure of the present utility model;
Embodiment
Below in conjunction with accompanying drawing and instantiation the utility model is further described:
The theory diagram of this example as shown in Figure 1.
1, the composition of main power section:
Main power section is made up of power tube MOSFET clamp diode variable power device overcurrent sampling resistor output rectifier diode filter capacitor three terminal regulator, the course of work is following at first carries out copped wave by power tube MOSFET to input voltage, isolating and transferring to multichannel output through the power inverter step-down, again through the voltage stabilizing of rectifies capacitor filtering three terminal regulator, the multichannel output voltage that will obtain exactly at last, QQ3 wherein, QQ4 is main power tube MOSFET, D19, D20 is a clamp diode, R128-R130 is an over-current detection resistance, TRX1 is a power inverter, DO6-DO10 is a rectifier diode, CA14-CA27 is a filter capacitor, R140, R141 is dead load, and 7805 7815-1 7815-2 are three terminal regulator.
2, feedback-control circuit part
Native system is that the UC3844 that produced by Unitrode company is as the control core, carry out computing according to the output voltage value of feedback and the error amplifier that detect, computing produces the PWM ripple and removes driving power pipe MOSFET, ON time by control MOSFET is come control output voltage, it is stabilized on the desired value, R124 R125 R136 Rr2 is a feedback sample resistance among the figure, R126 is the biasing resistor of optical isolator, TL431 constitutes the error amplifier of secondary side, C71 C72 R127 is the error amplifier compensator, U20 is an optical isolator, the isolation of feedback circuit and main circuit is provided, R138 R139 R142 C89 is the concussion resistance and the electric capacity of chip, R135 is a current-limiting resistance, C74 is a filter capacitor, and R133 guarantees to be coupled by optical isolator from the operating current that the TL431 feedback is come, and can not influence the pull-up current source of the 1MA of UC3844 inside.
3, driving circuit section
In order to improve the driving force of controller output PWM ripple; needing the special driving circuit amplifies its signal and expands to two-way; at first drive signal is through the complementary follower of an emitter-base bandgap grading; drive two-way MOSFET by a high-frequency pulse transformer then; R153 R154 provides the electric current limiting protecting to IC among the figure; DW7 DW8 DW9 DW10 is used for to the too high protection of the gate source voltage of power MOSFET; R155 R156 is used for reducing the drain-source impedance; C101 is a capacitance; be used for degaussing, C102 is a filter capacitor.
Claims (4)
1. automatic control output voltage electric supply installation of realizing based on UC3844, it is characterized in that it is to be made of three parts: main power section, feedback-control section, drive part, main power section is connected feedback-control section respectively with drive part, control section is to be core by UC3844, comprise error amplifier compensator, light-coupled isolation, PWM output and feedback inlet, the feedback inlet is connected with light-coupled isolation.
2. the automatic control output voltage electric supply installation of realizing based on UC3844 according to claim 1 is characterized in that described control section comprises the error amplification compensator and the optical coupling isolator of connection, and optical coupling isolator connects the control chip part.
3. the automatic control output voltage power supply technique device of realizing based on UC3844 according to claim 2, it is characterized in that described main power section power tube MOSFET, power inverter, rectifier diode, filter capacitor and three terminal regulator composition, input voltage is for connecting power tube MOSFET, power tube MOSFET connects power inverter, power inverter connects rectifier diode, and rectifier diode connects filtered electrical; Filter capacitor connects three terminal regulator, and three terminal regulator connects control section by feedback.
4. the automatic control output voltage electric supply installation of realizing based on UC3844 according to claim 3, it is characterized in that described drive part comprises the complementary follower of emitter-base bandgap grading, high-frequency pulse transformer, current-limiting resistance, voltage stabilizing didoe, the complementary follower of emitter-base bandgap grading connects high-frequency pulse transformer, high-frequency pulse transformer connects current-limiting resistance, and current-limiting resistance connects voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201010787U CN201563062U (en) | 2009-10-15 | 2009-10-15 | Power supply device capable of automatically controlling output voltage based on UC3844 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201010787U CN201563062U (en) | 2009-10-15 | 2009-10-15 | Power supply device capable of automatically controlling output voltage based on UC3844 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201563062U true CN201563062U (en) | 2010-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201010787U Expired - Fee Related CN201563062U (en) | 2009-10-15 | 2009-10-15 | Power supply device capable of automatically controlling output voltage based on UC3844 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201563062U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393753A (en) * | 2014-11-26 | 2015-03-04 | 广西大学 | Multi-output voltage power circuit |
| CN106329912A (en) * | 2016-10-14 | 2017-01-11 | 成都前锋电子仪器有限责任公司 | Auxiliary power supply circuit |
-
2009
- 2009-10-15 CN CN2009201010787U patent/CN201563062U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104393753A (en) * | 2014-11-26 | 2015-03-04 | 广西大学 | Multi-output voltage power circuit |
| CN106329912A (en) * | 2016-10-14 | 2017-01-11 | 成都前锋电子仪器有限责任公司 | Auxiliary power supply circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100825 Termination date: 20171015 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |