CN213661456U - Non-isolation Boost circuit based on UC3843 - Google Patents
Non-isolation Boost circuit based on UC3843 Download PDFInfo
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- CN213661456U CN213661456U CN202021936939.6U CN202021936939U CN213661456U CN 213661456 U CN213661456 U CN 213661456U CN 202021936939 U CN202021936939 U CN 202021936939U CN 213661456 U CN213661456 U CN 213661456U
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- 238000002955 isolation Methods 0.000 title claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 59
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000002093 peripheral effect Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The utility model discloses a non-isolation Boost technical field's a non-isolation Boost circuit based on UC3843, including 12V output main circuit, 12V output control circuit is 3V with voltage BAT, and output DC voltage is 12V, corresponds between 12V output main circuit and the 12V output control circuit through CHG.DRV pin and CS pin electric connection, including chip U12 in the 12V output control circuit, the model is UC3843, 12V output control circuit is the control circuit of non-isolation Boost circuit based on UC3843, takes non-isolation's mode, has reduced isolation transformer, has reduced transformer feedback power supply, and then has reduced the complexity of circuit; the conversion efficiency of the output circuit is improved, so that the conversion efficiency is over 85% when the circuit outputs 12V; the control chip adopts the high-efficiency UC3843, wherein the peripheral circuit of the control chip is simple, and the control chip can work only by externally connecting a small number of components, so that the structure of the circuit is simplified, and the efficiency of the system is greatly improved.
Description
Technical Field
The utility model relates to a non-isolation Boost technical field specifically is a non-isolation Boost circuit based on UC 3843.
Background
In the use process related to the electronic field, the power supply can not be basically separated, so that the research on the power supply technology to reach a higher level has great significance. In the power supply circuit of isolated, the energy consumption of drive power supply chip is high, needs to pass through the isolation transformer feed, and the quantity of components and parts is also more, has increased line and solder joint to make the complexity of circuit increase, and the effective utilization efficiency of power also can reduce, based on this, the utility model discloses a Boost circuit is kept apart in order to solve above-mentioned problem to non-based on UC 3843.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a non-isolation Boost circuit based on UC3843 to in solving the power supply circuit of the isolation type that proposes in the above-mentioned background art, drive power supply chip's energy consumption is high, need pass through isolation transformer feed, and the quantity of components and parts is also more, has increased line and solder joint, thereby makes the complexity of circuit increase, and the effective utilization efficiency of power also can reduce.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a non-isolation Boost circuit based on UC3843, includes that 12V output main circuit, 12V output control circuit are 3V with voltage BAT, and output DC voltage is 12V, correspond between 12V output main circuit and the 12V output control circuit through CHG.DRV pin and CS pin electric connection, including chip U12 in the 12V output control circuit, the model is UC3843, and 12V output control circuit is the control circuit of non-isolation Boost circuit based on UC3843, the initial input voltage of 12V output main circuit is 3V.
Preferably, the 12V output main circuit includes an N-channel MOS transistor Q, an inductor L, a freewheeling diode D, resistors R, a current-limiting resistor R, a diode D, capacitors C, and a capacitor C, an anode of the capacitor C is connected to one end of the inductor L, one ends of the resistors R, and one end of the capacitor C is connected to the BAT power supply, the inductor L, the resistor R, and the capacitor C are all connected in parallel, a cathode of the capacitor C is connected to one end of the current-limiting resistor R and a cathode of the capacitor C and then grounded, a D electrode of the inductor L, a positive electrode of the freewheeling diode D, and a positive electrode of the D are connected, a cathode of the freewheeling diode D is connected to an anode of the capacitor C and then serves as an output terminal DC +12V of the 12V output main circuit, another end of the current-limiting resistor R is connected to an S electrode of the N-channel MOS transistor Q, and one end of the resistor R is connected to a G electrode of the N-channel MOS transistor Q and and one end of the R15 is connected with the G pole of an N-channel MOS tube Q5, and R15 is connected with a current-limiting resistor R24 in parallel.
Preferably, the 12V output control circuit further includes an NPN transistor Q7, a resistor R53, R54, R59 to R62, R64, a capacitor C29, C32 to C36, and a diode D7; a pin 1 of the chip U is connected with one end of capacitors C and C, a pin 2 of the chip U is connected with the other end of a second capacitor C and one end of resistors R and R, a pin 3 of the chip U is connected with one end of the resistors R, R and one end of the capacitor C, a pin 4 of the chip U is connected with one end of the resistor R and one end of the capacitor C, the other end of the R is connected with a collector of an NPN triode Q and one end of the capacitor C, a pin 5 of the chip U is connected with the other ends of the capacitors C, C and C, the other ends of the resistors R and one end of the capacitor C are connected and then grounded, a pin 6 of the chip U is extended to be a CHG.DRV pin, a pin 7 of the chip U is connected with a 12V power supply, a pin 8 of the chip U is connected with one end of the capacitor C, the other end of the resistor R and the collector of the NPN triode Q, an emitter of the NPN, the negative end of the diode D7 is connected with the other end of the resistor R54, and the other end of the resistor R64 is grounded.
Preferably, the other end of the resistor R62 is connected to a DC +12V output as a voltage feedback interface.
Preferably, the capacitor C18 and the capacitor C13 are both electrolytic capacitors.
Compared with the prior art, the beneficial effects of the utility model are that: by adopting a non-isolation mode, isolation transformers are reduced, feedback power supply of the transformers is reduced, and further the complexity of the circuit is reduced; the conversion efficiency of the output circuit is improved, so that the conversion efficiency is over 85% when the circuit outputs 12V; the control chip adopts the high-efficiency UC3843, wherein the peripheral circuit of the control chip is simple, and the control chip can work only by externally connecting a small number of components, so that the structure of the circuit is simplified, and the efficiency of the system is greatly improved.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a connection diagram of 12V output main circuit of the present invention
Fig. 2 is a circuit connection diagram of the 12V output control circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the present invention provides a non-isolated Boost circuit based on UC3843, which includes: a non-isolation Boost circuit based on UC3843 comprises a 12V output main circuit, a 12V output control circuit and a voltage BAT of 3V, an output DC voltage of 12V, the 12V output main circuit and the 12V output control circuit are electrically connected through a CHG.DRV pin and a CS pin correspondingly, the 12V output control circuit comprises a chip U12, the model is UC3843, the 12V output control circuit is a control circuit of the non-isolation Boost circuit based on UC3843, the initial input voltage of the 12V output main circuit is 3V, the 12V output main circuit comprises an N-channel MOS tube Q5, an inductor L3, a freewheeling diode D3, a resistor R16, R17, R21, R15, a current limiting resistor R24, a diode D4, capacitors C11, C13 and a capacitor C18, the positive electrode of a capacitor C18 and one end of an inductor L3, one end of the resistors R16 and R17 is connected with one end of a capacitor C11 and then connected with the power supply, the inductor L4642, the resistor R17 and the resistor R4642, Capacitors C11 are all connected in parallel, the cathode of the capacitor C18 is connected with one end of a current-limiting resistor R24 and the cathode of a capacitor C14 and then grounded, the other end of an inductor L3 is connected with the D pole of an N-channel MOS tube Q5, the positive end of a freewheeling diode D3 and the positive end of a D4, the cathode of a freewheeling diode D3 is connected with the anode of a capacitor C13 and then serves as an output end DC +12V of the 12V output main circuit, the other end of the current-limiting resistor R13 is connected with the S pole of the N-channel MOS tube Q13, one end of the resistor R13 is connected with the G pole of the N-channel MOS tube Q13 and serves as the input end PWM of the 12V output main circuit, one end of the R13 is connected with the G pole of the N-channel MOS tube Q13, the R13 is connected with the R13 in parallel, the capacitors C13 and the capacitors C13 are electrolytic capacitors C13, and the 12V output control circuit further comprises an NPN-P Q13, resistors, R13; pin 1 of chip U12 is connected to one end of capacitors C35 and C36, pin 2 of chip U12 is connected to the other end of capacitors C35 and C36 and one end of resistors R62 and R64, pin 3 of chip U12 is connected to one end of resistors R60, R61 and R59 and one end of capacitor C34, pin 4 of chip U12 is connected to one end of resistor R53 and one end of capacitor C33, the other end of R53 is connected to one end of a collector of NPN transistor Q7 and one end of capacitor C32, pin 5 of chip U12 is connected to the other end of capacitors C32, C33 and C34, the other end of resistors R60 and R61 and one end of capacitor C29 are connected to ground, pin 6 of chip U12 is led out to a chg.drv pin, pin 7 of chip U12 is connected to a 12V power supply, pin 8 of chip U12 is connected to the positive terminal of capacitor C6372, the other end of resistor R72 and the negative terminal of resistor R12, and the collector of NPN diode 12 is connected to the emitter 36d 12, the other end of the resistor R64 is grounded, and the other end of the resistor R62 is connected to the DC +12V output to serve as a voltage feedback interface.
The circuit comprises a Boost circuit, an output circuit and a UC3843 output control and current limiting circuit. When the circuit is used for 3V input, a boost circuit topological structure is adopted, so that the output can reach 12V; by adopting a freewheeling diode structure and a current detection circuit, the conversion efficiency of the output circuit is improved, so that when the circuit outputs 12V, the conversion efficiency is over 85 percent; the control chip adopts the high-efficiency UC3843, wherein the peripheral circuit of the control chip is simple, and the control chip can work only by externally connecting a small number of components. The structure of the circuit is simplified, and the efficiency of the system is greatly improved; the non-isolated Boost circuit of UC3843 includes: a boost circuit composed of an inductor L3, a switch circuit and a current detection circuit composed of MOS tubes, and a UC3843 output PWM control and voltage feedback circuit; the UC3843 outputs PWM to control the conduction of an N-channel MOS tube Q5, and 3V is boosted to 12V output by a BOOST boosting mode.
Due to the adoption of a non-isolation mode, isolation transformers are reduced, feedback power supply of the transformers is reduced, and further the complexity of the circuit is reduced; the conversion efficiency of the output circuit is improved, so that the conversion efficiency is over 85% when the circuit outputs 12V; the control chip adopts the high-efficiency UC3843, wherein the peripheral circuit of the control chip is simple, and the control chip can work only by externally connecting a small number of components, so that the structure of the circuit is simplified, and the efficiency of the system is greatly improved.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The utility model provides a non-isolation Boost circuit based on UC3843, its characterized in that includes that 12V exports main circuit, 12V output control circuit and voltage BAT are 3V, and output DC voltage is 12V, correspond through CHG.DRV pin and CS pin electric connection between 12V exports main circuit and the 12V output control circuit, including chip U12 in the 12V output control circuit, the model is UC3843, and 12V output control circuit is the control circuit of non-isolation Boost circuit based on UC3843, the initial input voltage of 12V output main circuit is 3V.
2. The UC 3843-based non-isolated Boost voltage Boost circuit of claim 1, wherein: the 12V output main circuit comprises an N-channel MOS tube Q, an inductor L, a freewheeling diode D, resistors R, a current-limiting resistor R, a diode D, capacitors C, C and a capacitor C, wherein the anode of the capacitor C is connected with one end of the inductor L, one ends of the resistors R and R, one end of the capacitor C is connected with a BAT power supply, the inductor L, the resistor R and the capacitor C are all connected in parallel, the cathode of the capacitor C is connected with one end of the current-limiting resistor R and the cathode of the capacitor C and then grounded, the other end of the inductor L is connected with the D electrode of the N-channel MOS tube Q and the anode of the freewheeling diode D, the cathode of the freewheeling diode D is connected with the anode of the capacitor C and then used as the output end DC +12V of the 12V output main circuit, the other end of the current-limiting resistor R is connected with the S electrode of the N-channel MOS tube Q, one end of the resistor R is connected with the G electrode of the N-channel MOS, one end of the R15 is connected with the G pole of an N-channel MOS tube Q5, and R15 is connected with a current-limiting resistor R24 in parallel.
3. The UC 3843-based non-isolated Boost voltage Boost circuit of claim 1, wherein: the 12V output control circuit further comprises an NPN triode Q7, resistors R53, R54, R59-R62, R64, capacitors C29, C32-C36 and a diode D7; a pin 1 of the chip U is connected with one end of capacitors C and C, a pin 2 of the chip U is connected with the other end of a second capacitor C and one end of resistors R and R, a pin 3 of the chip U is connected with one end of the resistors R, R and one end of the capacitor C, a pin 4 of the chip U is connected with one end of the resistor R and one end of the capacitor C, the other end of the R is connected with a collector of an NPN triode Q and one end of the capacitor C, a pin 5 of the chip U is connected with the other ends of the capacitors C, C and C, the other ends of the resistors R and one end of the capacitor C are connected and then grounded, a pin 6 of the chip U is extended to be a CHG.DRV pin, a pin 7 of the chip U is connected with a 12V power supply, a pin 8 of the chip U is connected with one end of the capacitor C, the other end of the resistor R and the collector of the NPN triode Q, an emitter of the NPN, the negative end of the diode D7 is connected with the other end of the resistor R54, and the other end of the resistor R64 is grounded.
4. The UC 3843-based non-isolated Boost voltage circuit of claim 3, wherein: the other end of the resistor R62 is connected to a DC +12V output as a voltage feedback interface.
5. The UC 3843-based non-isolated Boost voltage Boost circuit of claim 2, wherein: the capacitor C18 and the capacitor C13 are electrolytic capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021936939.6U CN213661456U (en) | 2020-09-07 | 2020-09-07 | Non-isolation Boost circuit based on UC3843 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021936939.6U CN213661456U (en) | 2020-09-07 | 2020-09-07 | Non-isolation Boost circuit based on UC3843 |
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| Publication Number | Publication Date |
|---|---|
| CN213661456U true CN213661456U (en) | 2021-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021936939.6U Active CN213661456U (en) | 2020-09-07 | 2020-09-07 | Non-isolation Boost circuit based on UC3843 |
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| CN (1) | CN213661456U (en) |
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- 2020-09-07 CN CN202021936939.6U patent/CN213661456U/en active Active
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Address after: 510470 No. 2, 4, 6, 8, 10, and 12 Donghua Huaye Road, Renhe Town, Baiyun District, Guangzhou City, Guangdong Province (Airport Baiyun) Patentee after: GUANGZHOU FELICITY SOLAR TECHNOLOGY Co.,Ltd. Country or region after: China Address before: 510470 23 Donghua Xingfu street, Renhe Town, Baiyun District, Guangzhou City, Guangdong Province (Airport Baiyun) Patentee before: GUANGZHOU FELICITY SOLAR TECHNOLOGY Co.,Ltd. Country or region before: China |
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| CP03 | Change of name, title or address |