CN204536974U - The improvement circuit structure of linear voltage regulator - Google Patents
The improvement circuit structure of linear voltage regulator Download PDFInfo
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- CN204536974U CN204536974U CN201520239455.9U CN201520239455U CN204536974U CN 204536974 U CN204536974 U CN 204536974U CN 201520239455 U CN201520239455 U CN 201520239455U CN 204536974 U CN204536974 U CN 204536974U
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- type triode
- error amplifier
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Abstract
The utility model discloses a kind of improvement circuit structure of linear voltage regulator.It comprises band-gap reference circuit, voltage follower circuit, V/I change-over circuit, I/V change-over circuit, electrifying control circuit and error amplifier, band-gap reference circuit is connected with voltage follower circuit, electrifying control circuit respectively, voltage follower circuit, V/I change-over circuit, I/V change-over circuit are connected successively, electrifying control circuit is connected with I/V change-over circuit, I/V change-over circuit is connected with the inverting input of error amplifier, the in-phase input end of error amplifier is connected with electrifying control circuit, and the output terminal of error amplifier is connected with electrifying control circuit by ENA.The utility model, by improvement to circuit structure, avoids band-gap reference source circuit when circuit just starts and can not to work the problem of the whole circuit deadlock caused, reach the purpose of design of circuit low-power consumption.
Description
Technical field
The utility model relates to a kind of circuit improved structure, be specifically related to a kind of improvement circuit structure of linear voltage regulator.
Background technology
Along with the fast development of the portable sets such as mobile phone, palm PC, notebook computer and medical treatment, testing tool has pulled the fast development with low pressure difference linear voltage regulator.Traditional circuit improved structure mainly comprises three parts: Correctional tube, error amplifier (EA) and resistance-feedback network.Its basic functional principle is: resistance-feedback network produces feedback voltage, error small-signal between feedback voltage and reference voltage amplifies by error amplifier, amplify through Correctional tube again and export, and form negative feedback thus, ensure that output voltage stabilization is at setting.But when this system just powers on, time linear voltage regulator does not export, band gap reference can not work, and error amplifier does not have input signal, also cannot work, and such whole system can be absorbed in dead point.Therefore, need to improve this traditional structure.
Utility model content
For the deficiency that prior art exists, the utility model object is the improvement circuit structure being to provide a kind of linear voltage regulator, by the improvement to circuit structure, avoid band-gap reference source circuit when circuit just starts can not to work the problem of the whole circuit deadlock caused, reach the purpose of design of circuit low-power consumption.
To achieve these goals, the utility model realizes by the following technical solutions: the improvement circuit structure of linear voltage regulator, comprise band-gap reference circuit, voltage follower circuit, V/I change-over circuit, I/V change-over circuit, electrifying control circuit and error amplifier, band-gap reference circuit respectively with voltage follower circuit, electrifying control circuit is connected, voltage follower circuit, V/I change-over circuit, I/V change-over circuit is connected successively, electrifying control circuit is connected with I/V change-over circuit, I/V change-over circuit is connected with the inverting input of error amplifier, the in-phase input end of error amplifier is connected with electrifying control circuit, the output terminal of error amplifier is connected with electrifying control circuit by ENA.
As preferably, described band-gap reference circuit comprises the first igbt, second igbt, first resistance, second resistance, operational amplifier, first PNP type triode Q1 and the second PNP type triode, first igbt, the source electrode of the second igbt is all connected with power end VDD, first igbt, the grid of the second igbt is connected with the output terminal of operational amplifier, the drain electrode of the first igbt connects the in-phase input end of first resistance one end and operational amplifier, the drain electrode of the second igbt is connected with second resistance one end, the inverting input that the second resistance other end connects operational amplifier is respectively connected with the emitter of the second PNP type triode, the emitter of another termination first PNP type triode of the first resistance, the base stage of the first PNP type triode and the equal ground connection of base stage of the second PNP type triode, the collector of the first PNP type triode is connected with the collector of the second PNP type triode.
The beneficial effects of the utility model: the utility model, by improvement to circuit structure, avoids band-gap reference source circuit when circuit just starts and can not to work the problem of the whole circuit deadlock caused, reach the purpose of design of circuit low-power consumption.
Accompanying drawing explanation
The utility model is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is band-gap reference circuit figure of the present utility model.
Embodiment
The technological means realized for making the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the utility model further.
With reference to Fig. 1-2, this embodiment is by the following technical solutions: the improvement circuit structure of linear voltage regulator, comprise band-gap reference circuit 1, voltage follower circuit 2, V/I change-over circuit 3, I/V change-over circuit 4, electrifying control circuit 5 and error amplifier EA, band-gap reference circuit 1 respectively with voltage follower circuit 2, electrifying control circuit 5 is connected, voltage follower circuit 2, V/I change-over circuit 3, I/V change-over circuit 4 is connected successively, electrifying control circuit 5 is connected with I/V change-over circuit 4, I/V change-over circuit 4 is connected with the inverting input of error amplifier EA, the in-phase input end of error amplifier EA is connected with electrifying control circuit 5, the output terminal of error amplifier EA is connected with electrifying control circuit 5 by ENA.
It should be noted that, described band-gap reference circuit 1 comprises the first igbt P1, second igbt P2, first resistance R1, second resistance R2, operational amplifier OPA, first PNP type triode Q1 and the second PNP type triode Q2, first igbt P1, the source electrode of the second igbt P2 is all connected with power end VDD, first igbt P1, the grid of the second igbt P2 is connected with the output terminal of operational amplifier OPA, the drain electrode of the first igbt P1 connects the in-phase input end of first resistance R1 one end and operational amplifier OPA, the drain electrode of the second igbt P2 is connected with second resistance R2 one end, the inverting input that the second resistance R2 other end meets operational amplifier OPA is respectively connected with the emitter of the second PNP type triode Q2, the emitter of another termination first PNP type triode Q1 of the first resistance R1, the base stage of the first PNP type triode Q1 and the equal ground connection of base stage of the second PNP type triode Q2, the collector of the first PNP type triode Q1 is connected with the collector of the second PNP type triode Q2.
The principle of work of this embodiment: when circuit just starts, the output voltage of LDO is also very low, such band-gap reference source circuit just can not work, VFB feeds back signal to electrifying control circuit, the electric current that this circuit produces is converted to a reference voltage by I/V, make error amplifier work, circuit is normal.Meanwhile, along with the output voltage of LDO progressively raises, VFB also and then raises, when LDO output voltage be elevated to band gap reference can be made to start working time, band gap reference can produce control signal, and electrifying control circuit is turned off.At this moment, the bandgap voltage reference that band-gap reference source circuit produces obtains by a voltage follower, V/I conversion, I/V conversion the input end that a reference voltage joins error amplifier, so far, error amplifier has had stable reference voltage, and circuit can normally work.
This embodiment, by improvement to circuit structure, avoids band-gap reference source circuit when circuit just starts and can not to work the problem of the whole circuit deadlock caused, reach the purpose of design of circuit low-power consumption.
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. the improvement circuit structure of linear voltage regulator, it is characterized in that, comprise band-gap reference circuit (1), voltage follower circuit (2), V/I change-over circuit (3), I/V change-over circuit (4), electrifying control circuit (5) and error amplifier (EA), band-gap reference circuit (1) respectively with voltage follower circuit (2), electrifying control circuit (5) is connected, voltage follower circuit (2), V/I change-over circuit (3), I/V change-over circuit (4) is connected successively, electrifying control circuit (5) is connected with I/V change-over circuit (4), I/V change-over circuit (4) is connected with the inverting input of error amplifier (EA), the in-phase input end of error amplifier (EA) is connected with electrifying control circuit (5), the output terminal of error amplifier (EA) is connected with electrifying control circuit (5) by ENA.
2. the improvement circuit structure of linear voltage regulator according to claim 1, it is characterized in that, described band-gap reference circuit (1) comprises the first igbt (P1), second igbt (P2), first resistance (R1), second resistance (R2), operational amplifier (OPA), first PNP type triode (Q1) and the second PNP type triode (Q2), first igbt (P1), the source electrode of the second igbt (P2) is all connected with power end VDD, first igbt (P1), the grid of the second igbt (P2) is connected with the output terminal of operational amplifier (OPA), the drain electrode of the first igbt (P1) connects the in-phase input end of the first resistance (R1) one end and operational amplifier (OPA), the drain electrode of the second igbt (P2) is connected with the second resistance (R2) one end, the emitter that second resistance (R2) other end connects inverting input and second (PNP) type triode (Q2) of operational amplifier (OPA) is respectively connected, the emitter of another termination first PNP type triode (Q1) of the first resistance (R1), the base stage of the first PNP type triode (Q1) and the equal ground connection of base stage of the second PNP type triode (Q2), the collector of the first PNP type triode (Q1) is connected with the collector of the second PNP type triode (Q2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520239455.9U CN204536974U (en) | 2015-04-20 | 2015-04-20 | The improvement circuit structure of linear voltage regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520239455.9U CN204536974U (en) | 2015-04-20 | 2015-04-20 | The improvement circuit structure of linear voltage regulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204536974U true CN204536974U (en) | 2015-08-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520239455.9U Expired - Fee Related CN204536974U (en) | 2015-04-20 | 2015-04-20 | The improvement circuit structure of linear voltage regulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204536974U (en) |
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2015
- 2015-04-20 CN CN201520239455.9U patent/CN204536974U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20160420 |