CN205540379U - Converter - 5V reference power supply circuit - Google Patents
Converter - 5V reference power supply circuit Download PDFInfo
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- CN205540379U CN205540379U CN201620314710.6U CN201620314710U CN205540379U CN 205540379 U CN205540379 U CN 205540379U CN 201620314710 U CN201620314710 U CN 201620314710U CN 205540379 U CN205540379 U CN 205540379U
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Abstract
The utility model discloses a converter the 5V reference power supply circuit, a converter the 5V reference power supply circuit, including elementary 2.5V reference voltage circuit, standard proportion amplifier circuit and output current expander circuit, reference voltage chip U1's one end ground connection, the other end is connected with first resistance R1, first resistance R1's the other end is connected with + 15V power, standard proportion amplifier circuit includes operational amplifier U2, second resistance R2 and third resistance R3, 2.5V reference voltage that elementary 2.5V reference voltage circuit 1 produced is connected with operational amplifier U2's reverse input end through second resistance R2, the output that fourth resistance R4 connects operational amplifier U2 is passed through to triode T1's base. Does this circuit provide the 5V reference voltage power, simple structure, bearing force is strong, not influenced by mains voltage's change, temperature variation, can generate steadily 5V reference voltage provides the current output up to thousands of milliamperes for the load.
Description
Technical field
This utility model belongs to converter circuit technical field, is specifically related to-5V the reference power circuit of a kind of converter.
Background technology
Converter is the drive control apparatus controlling ac motor rotating speed by changing motor working power Frequency Patterns.It is widely used in various industrial occasions with its feature such as energy-conservation, efficient.
The control circuit of converter, needs the power supply of various voltage to supply.Wherein-5V voltage is a critically important voltage level, and inside and outside converter, the driving of many measure loop and power device is required for an accurate and stable-5V voltage.And common-5V reference power circuit can only provide the reference voltage an of-5V, the most load-carrying ability, or load capacity is the least.And the operation of converter needs the detection of various inside and outsides and drive circuit, these are required for-5V voltage, thus need extra circuits, and structure is complicated, increase cost and fault rate is high.
-5V reference voltage the power supply that this circuit provides, simple in construction, load capacity is strong, and not by the changing of supply voltage, variations in temperature is affected, and can stably generate-5V reference voltage, provides the electric current output of up to thousands of milliamperes for load.
Summary of the invention
The purpose of this utility model is to provide-5V the reference power circuit of a kind of converter, with the problem solving to propose in above-mentioned background technology.
nullFor achieving the above object，This utility model following technical scheme of the offer :-5V reference power circuit of a kind of converter，Including primary 2.5V reference voltage circuit、Standard proportional amplifying circuit and output current expansioning circuit，Described primary 2.5V reference voltage circuit includes reference voltage chip U1、First resistance R1 and+15V power supply，One end ground connection of described reference voltage chip U1，The other end and the first resistance R1 connect，The other end of described first resistance R1 is connected with+15V power supply，Described standard proportional amplifying circuit includes operational amplifier U2、Second resistance R2 and the 3rd resistance R3，The 2.5V reference voltage that described primary 2.5V reference voltage circuit 1 produces is connected through the reverse input end of the second resistance R2 and operational amplifier U2，The input end grounding in the same direction of described operational amplifier U2，Described second resistance R2 is also connected with the 3rd resistance R3，Described output current expansioning circuit includes the 4th resistance R4、5th resistance R5 and audion T1，The base stage of the described audion T1 outfan by the 4th resistance R4 concatenation operation amplifier U2，The colelctor electrode of described audion T1 connects-15V power supply，The emitter stage of described audion T1 and the 3rd resistance R3 and the 5th resistance R5 connect，One end external load of described 5th resistance R5，Other end ground connection.
Preferably, described reference voltage chip U1 is 2.5V reference voltage chip REF1004.
Preferably, described operational amplifier U2 is TL082 operation amplifier chip, wherein R3/R2=2.
Preferably, the output loop of described operational amplifier U2 introduces the output current expansioning circuit being made up of resistance R4, R5 and audion T1.
Compared with prior art, the beneficial effects of the utility model are: this converter-5V reference power circuit, by the design of reference voltage chip so that transformation process is not affected by temperature and power supply voltage variation；The design combined by operational amplifier and current expansioning circuit so that transformation Process Duty ability is higher；-5V the reference power circuit of this converter, has simple in construction, and load capacity is strong, and not by the changing of supply voltage, variations in temperature is affected, and can stably generate-5V reference voltage, provides the electric current output of up to thousands of milliamperes for load, can use with popularity.
Accompanying drawing explanation
Fig. 1 is circuit principle structure schematic diagram of the present utility model.
In figure: 1 primary 2.5V reference voltage circuit, 2 standard proportional amplifying circuits, 3 output current expansioning circuits.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
This utility model provides the-5V reference power circuit of a kind of converter as shown in Figure 1, one end ground connection of described reference voltage chip U1, the other end and the first resistance R1 connect, and the first resistance R1 other end is connected with+15V power supply, produce 2.5V reference voltage U at A pointA, the 2.5V reference voltage of A point is connected through the reverse input end of the second resistance R2 and operational amplifier U2, the input end grounding in the same direction of operational amplifier U2, and the reverse input end of operational amplifier U2 is also connected with the 3rd resistance R3, from operational amplifier principle:
UB=-UA*R3/R2
Arrange R2=5k Ω, R3=10k Ω can obtain B point voltage is that-5V is required reference voltage.But, owing to the load capacity of operational amplifier itself is the most weak, in addition it is also necessary to by output current expansioning circuit, its load capacity is amplified.Output current expansioning circuit includes the 4th resistance R4, the 5th resistance R5 and audion T1, the base stage of the audion T1 outfan by the 4th resistance R4 concatenation operation amplifier U2, by resistance R4, the base current of audion T1 is limited in the output area of operational amplifier U2, the colelctor electrode of audion T1 connects-15V power supply, the emitter stage of audion T1 and the 3rd resistance R3 and the 5th resistance R5 connect, from this external load, there is provided-5V reference circuit output N5REF, dynatron performance the relation understanding emitter current Ie and base current Ib is:
Ie=(1+ β) * Ib
Select suitable audion or compound transistor, it is possible to output it Current amplifier extremely thousands of milliamperes, load based on the 5th resistance R5 other end ground connection, it is ensured that the stable operation of circuit time unloaded.
Last it is noted that the foregoing is only preferred embodiment of the present utility model; it is not limited to this utility model; although this utility model being described in detail with reference to previous embodiment; for a person skilled in the art; technical scheme described in foregoing embodiments still can be modified by it; or wherein portion of techniques feature is carried out equivalent; all within spirit of the present utility model and principle; the any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (4)
1.-5V the reference power circuit of a converter, including primary 2.5V reference voltage circuit (1), standard proportional amplifying circuit (2) and output current expansioning circuit (3), it is characterized in that: described primary 2.5V reference voltage circuit (1) includes reference voltage chip U1, the first resistance R1 and+15V power supply, one end ground connection of described reference voltage chip U1, the other end and the first resistance R1 connect, and the other end of described first resistance R1 is connected with+15V power supply；Described standard proportional amplifying circuit (2) includes operational amplifier U2, the second resistance R2 and the 3rd resistance R3, the 2.5V reference voltage that described primary 2.5V reference voltage circuit (1) produces is connected through the reverse input end of the second resistance R2 and operational amplifier U2, the input end grounding in the same direction of described operational amplifier U2, described second resistance R2 is also connected with the 3rd resistance R3；Described output current expansioning circuit (3) includes the 4th resistance R4, the 5th resistance R5 and audion T1, the base stage of the described audion T1 outfan by the 4th resistance R4 concatenation operation amplifier U2, the colelctor electrode of described audion T1 connects-15V power supply, the emitter stage of described audion T1 and the 3rd resistance R3 and the 5th resistance R5 connect, one end external load of described 5th resistance R5, other end ground connection.
-5V the reference power circuit of a kind of converter the most according to claim 1, it is characterised in that: described reference voltage chip U1 is 2.5V reference voltage chip REF1004.
-5V the reference power circuit of a kind of converter the most according to claim 1, it is characterised in that: described operational amplifier U2 is TL082 operation amplifier chip, wherein R3/R2=2.
-5V the reference power circuit of a kind of converter the most according to claim 1, it is characterised in that: the output loop of described operational amplifier U2 introduces the output current expansioning circuit being made up of resistance R4, R5 and audion T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620314710.6U CN205540379U (en) | 2016-04-15 | 2016-04-15 | Converter - 5V reference power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620314710.6U CN205540379U (en) | 2016-04-15 | 2016-04-15 | Converter - 5V reference power supply circuit |
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| Publication Number | Publication Date |
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| CN205540379U true CN205540379U (en) | 2016-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620314710.6U Active CN205540379U (en) | 2016-04-15 | 2016-04-15 | Converter - 5V reference power supply circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815951A (en) * | 2022-06-30 | 2022-07-29 | 苏州贝克微电子股份有限公司 | Circuit structure capable of reducing temperature influence |
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2016
- 2016-04-15 CN CN201620314710.6U patent/CN205540379U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815951A (en) * | 2022-06-30 | 2022-07-29 | 苏州贝克微电子股份有限公司 | Circuit structure capable of reducing temperature influence |
| CN114815951B (en) * | 2022-06-30 | 2022-10-04 | 苏州贝克微电子股份有限公司 | Circuit structure capable of reducing temperature influence |
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