CN102662424B - Precise voltage stabilizing circuit for singlechip - Google Patents
Precise voltage stabilizing circuit for singlechip Download PDFInfo
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- CN102662424B CN102662424B CN201210081327.7A CN201210081327A CN102662424B CN 102662424 B CN102662424 B CN 102662424B CN 201210081327 A CN201210081327 A CN 201210081327A CN 102662424 B CN102662424 B CN 102662424B
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Abstract
The invention provides a precise voltage stabilizing circuit for a singlechip. The precise voltage stabilizing circuit for the singlechip comprises a master work circuit connected with the singlechip; the master work circuit comprises an operational amplifier U1 and a triode Q2; a reference power supply output end of the singlechip is connected with an inverted input end of the operational amplifier U1 through a resistor R7; a non-inverted input end of the operational amplifier U1 is grounded through a resistor R8; the output end of the operational amplifier U1 is connected with a base electrode of the triode Q2 through a resistor R10; an emitter of the triode Q2 is connected with power supply voltage of the master work circuit; a collector of the triode Q2 is connected with a power supply input end of the singlechip, and the power input end of the singlechip has initial electrifying voltage. Compared with the voltage stabilizing circuit for the conventional singlechip, the precise voltage stabilizing circuit for the singlechip disclosed by the invention has lower cost, has the voltage stabilizing effect equivalent to that of a low dropout regulator (LDO), and can meet the power supply requirement of the singlechip.
Description
Technical field
The invention belongs to electronic circuit technology field, relate to a kind of mu balanced circuit, be specifically related to a kind of single-chip microcomputer accurate voltage-stabilizing circuit.
Background technology
Single-chip microcomputer complete machine power supply is very important in single-chip microcomputer application time.Because single-chip microcomputer not only requires voltage, electric current, energy consumption, also have the requirement of electrification reset, so power supply not only will provide stable voltage, sufficient power supply, and requires the Voltage Establishment time of power supply fast, power consumption is low.Common microcontroller power supply feed circuit can adopt LDO(Low dropout regulator, low pressure difference linear voltage regulator), DC/DC(DC-DC power supply) or stabilivolt mu balanced circuit.But the circuit cost of LDO and DC/DC is all higher, and the voltage regulation result of stabilivolt mu balanced circuit and consistance are poor.
Summary of the invention
The shortcoming of prior art, the object of the present invention is to provide a kind of single-chip microcomputer accurate voltage-stabilizing circuit in view of the above, in order to rationally to measure exactly the characteristic of cooperation wireless channel.
For achieving the above object and other relevant objects, the invention provides a kind of single-chip microcomputer accurate voltage-stabilizing circuit.
A single-chip microcomputer accurate voltage-stabilizing circuit, described single-chip microcomputer comprises the main operating circuit being connected with single-chip microcomputer with accurate voltage-stabilizing circuit; Described main operating circuit comprises amplifier U1 and triode Q2; The reference power supply output terminal of single-chip microcomputer connects the inverting input of amplifier U1 by a resistance R 7, the in-phase input end of amplifier U1 is by resistance R 8 ground connection, and the output terminal of amplifier U1 connects the base stage of triode Q2 by a resistance R 10; The emitter of triode Q2 connects the supply voltage of main operating circuit; The collector of triode Q2 connects the power input of single-chip microcomputer; The power input of single-chip microcomputer has initial upper piezoelectric voltage.
As a preferred embodiment of the present invention, the collector of described triode Q2 is by a Voltage stabilizing module ground connection; Described Voltage stabilizing module consists of stabilivolt in parallel and electric capacity.
As another kind of preferred version of the present invention, the base stage of described triode Q2 connects the emitter of triode Q2 by a resistance R 4.
As another preferred version of the present invention, between the output terminal of the inverting input of described amplifier U1 and amplifier U1, be connected a filter capacitor C1; The in-phase input end of amplifier U1 is connected with the collector of triode Q2 by a resistance R 9.
As another preferred version of the present invention, described initial upper piezoelectric voltage is provided by an initial electrification circuit, and described initial electrification circuit comprises resistance R 3, R5, stabilivolt Z2, capacitor C 3 and diode D1; One termination voltage input end of described resistance R 3, one end of the other end connecting resistance R5 of resistance R 3, the other end ground connection of resistance R 5; Described stabilivolt Z2 and capacitor C 3 are all in parallel with resistance R 5; The other end of described resistance R 3 also connects the positive pole of diode D1; The negative pole of described diode D1 connects the power input of single-chip microcomputer.
As another preferred version of the present invention, described single-chip microcomputer also comprises an overvoltage crowbar being connected with the emitter of triode Q2 with accurate voltage-stabilizing circuit; Described overvoltage crowbar comprises a triode Q1; the collector of triode Q1 connects voltage input end by a resistance R 1; the emitter of triode Q1 connects the emitter of described triode Q2; the base stage of triode Q1 is by a stabilivolt Z1 ground connection, and the base stage of triode Q1 also connects voltage input end by a resistance R 2.
As mentioned above, single-chip microcomputer accurate voltage-stabilizing circuit of the present invention, has following beneficial effect:
Single-chip microcomputer of the present invention is low with mu balanced circuit cost than existing single-chip microcomputer with accurate voltage-stabilizing circuit, and voltage regulation result is suitable with LDO effect, and can meet the power demands of single-chip microcomputer.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of accurate voltage-stabilizing circuit for single-chip microcomputer of the present invention.
Fig. 2 is the circuit theory diagrams of initial electrification circuit of the present invention.
Fig. 3 is the circuit theory diagrams of main operating circuit of the present invention.
Fig. 4 is the circuit theory diagrams of overvoltage crowbar of the present invention.
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this instructions.The present invention can also be implemented or be applied by other different embodiment, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
Refer to accompanying drawing.It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy and only show with assembly relevant in the present invention in graphic but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
The invention provides a kind of single-chip microcomputer accurate voltage-stabilizing circuit, this circuit comprises amplifier, single-chip microcomputer (MCU), triode, stabilivolt, resistance, electric capacity, power supply.The present invention utilizes the kernel reference power supply+2.5V of single-chip microcomputer self as the reference voltage of integrated operational amplifier circuit, by amplifier, controls triode Q2 output acquisition+5V voltage again to single-chip microcomputer (MCU) power supply, forms a closed loop circuit.Be characterized in obtaining an accurate voltage by amplifier.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Embodiment
The present embodiment provides a kind of single-chip microcomputer accurate voltage-stabilizing circuit, and as shown in Figure 1, described single-chip microcomputer comprises main operating circuit and the initial electrification circuit being connected with single-chip microcomputer with accurate voltage-stabilizing circuit, and the overvoltage crowbar being connected with main operating circuit.
As illustrated in fig. 1 and 2, described initial electrification circuit comprises resistance R 3, R5, stabilivolt Z2, capacitor C 3 and diode D1; One termination voltage input end (Vin) of described resistance R 3, one end of the other end connecting resistance R5 of resistance R 3, the other end ground connection of resistance R 5; Described stabilivolt Z2 and capacitor C 3 are all in parallel with resistance R 5; The other end of described resistance R 3 also connects the positive pole of diode D1; The negative pole of described diode D1 connects the power input of single-chip microcomputer.Described initial electrification circuit provides initial upper piezoelectric voltage to single-chip microcomputer.
When the voltage input end (Vin) of initial electrification circuit initially powers on, single-chip microcomputer (MCU) does not have the reference voltage of output+2.5V, therefore main operating circuit (discharge circuit) is not worked.At this moment initial electrification circuit is greater than with R5 dividing potential drop acquisition one voltage that 2.5V is less than 5.1V by R3, and this voltage is that single-chip microcomputer (MCU) provides initial power supply by diode D1, and now single-chip microcomputer kernel just can produce one stable+2.5V reference voltage.
As shown in figs. 1 and 3, described main operating circuit comprises amplifier U1 and triode Q2; The reference power supply output terminal of single-chip microcomputer connects the inverting input of amplifier U1 by a resistance R 7, the in-phase input end of amplifier U1 is by resistance R 8 ground connection, and the output terminal of amplifier U1 connects the base stage of triode Q2 by a resistance R 10; The emitter of triode Q2 connects the supply voltage of main operating circuit; The collector of triode Q2 connects the power input of single-chip microcomputer; The power input of single-chip microcomputer has initial upper piezoelectric voltage.The collector of described triode Q2 is by a Voltage stabilizing module ground connection; Described Voltage stabilizing module consists of stabilivolt in parallel and electric capacity.The base stage of described triode Q2 connects the emitter of triode Q2 by a resistance R 4; Described resistance R 4 is connected with capacitor C 6.Between the output terminal of the inverting input of described amplifier U1 and amplifier U1, be connected a filter capacitor C1; The in-phase input end of amplifier U1 is connected with the collector of triode Q2 by a resistance R 9.
Inverting input at amplifier U1 adds after the reference voltage of one+2.5V, and according to amplifier principle of work, at the voltage of also can the produce+2.5V of in-phase input end of amplifier U1, the voltage that can obtain the power input VDDP of single-chip microcomputer is:
VDDP=2.5V/R8*(R8+R9)=2.5V/10K*(10K+10K)=5V
After this 5V voltage produces, to single-chip microcomputer (MCU) power supply, now diode D1 cuts off the power supply of initial electrification circuit, makes single-chip microcomputer (MCU) keep the less 5V Power supply of a steady ripple.
As shown in figs. 1 and 4; described overvoltage crowbar comprises a triode Q1; the collector of triode Q1 connects voltage input end by a resistance R 1; the emitter of triode Q1 connects the emitter of described triode Q2; the base stage of triode Q1 is by a stabilivolt Z1 ground connection, and the base stage of triode Q1 also connects voltage input end (Vin) by a resistance R 2.
For preventing that input voltage vin is too high, triode Q2 in main operating circuit is damaged, therefore add at triode Q2 front end the overvoltage crowbar that a large power triode Q1 forms.Utilize emitter follower circuit at the emitter of triode Q1, to produce the voltage of one+8.5V left and right, this voltage is whole main operating circuit power supply.
Single-chip microcomputer of the present invention is low with mu balanced circuit cost than existing single-chip microcomputer with accurate voltage-stabilizing circuit, and voltage regulation result is suitable with LDO effect, and can meet the power demands of single-chip microcomputer.
So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (5)
1. a single-chip microcomputer accurate voltage-stabilizing circuit, is characterized in that: described single-chip microcomputer comprises the main operating circuit being connected with single-chip microcomputer with accurate voltage-stabilizing circuit; Described main operating circuit comprises amplifier U1 and triode Q2; The reference power supply output terminal of single-chip microcomputer connects the inverting input of amplifier U1 by a resistance R 7, the in-phase input end of amplifier U1 is by resistance R 8 ground connection, and the output terminal of amplifier U1 connects the base stage of triode Q2 by a resistance R 10; The emitter of triode Q2 connects the supply voltage of main operating circuit; The collector of triode Q2 connects the power input of single-chip microcomputer; The power input of single-chip microcomputer has initial upper piezoelectric voltage; Described initial upper piezoelectric voltage is provided by an initial electrification circuit, and described initial electrification circuit comprises resistance R 3, R5, stabilivolt Z2, capacitor C 3 and diode D1; One termination voltage input end of described resistance R 3, one end of the other end connecting resistance R5 of resistance R 3, the other end ground connection of resistance R 5; Described stabilivolt Z2 and capacitor C 3 are all in parallel with resistance R 5; The other end of described resistance R 3 also connects the positive pole of diode D1; The negative pole of described diode D1 connects the power input of single-chip microcomputer.
2. single-chip microcomputer accurate voltage-stabilizing circuit according to claim 1, is characterized in that: the collector of described triode Q2 is by a Voltage stabilizing module ground connection; Described Voltage stabilizing module consists of stabilivolt in parallel and electric capacity.
3. single-chip microcomputer accurate voltage-stabilizing circuit according to claim 1, is characterized in that: the base stage of described triode Q2 connects the emitter of triode Q2 by a resistance R 4.
4. single-chip microcomputer accurate voltage-stabilizing circuit according to claim 1, is characterized in that: between the output terminal of the inverting input of described amplifier U1 and amplifier U1, be connected a filter capacitor C1; The in-phase input end of amplifier U1 is connected with the collector of triode Q2 by a resistance R 9.
5. single-chip microcomputer accurate voltage-stabilizing circuit according to claim 1, is characterized in that: described single-chip microcomputer also comprises an overvoltage crowbar being connected with the emitter of triode Q2 with accurate voltage-stabilizing circuit; Described overvoltage crowbar comprises a triode Q1; the collector of triode Q1 connects voltage input end by a resistance R 1; the emitter of triode Q1 connects the emitter of described triode Q2; the base stage of triode Q1 is by a stabilivolt Z1 ground connection, and the base stage of triode Q1 also connects voltage input end by a resistance R 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210081327.7A CN102662424B (en) | 2012-03-23 | 2012-03-23 | Precise voltage stabilizing circuit for singlechip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210081327.7A CN102662424B (en) | 2012-03-23 | 2012-03-23 | Precise voltage stabilizing circuit for singlechip |
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| CN102662424A CN102662424A (en) | 2012-09-12 |
| CN102662424B true CN102662424B (en) | 2014-12-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112087145A (en) * | 2020-09-07 | 2020-12-15 | 青岛鼎信通讯股份有限公司 | Isolation DC-DC circuit applied to electric power product |
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| CN106959739A (en) * | 2017-03-13 | 2017-07-18 | 深圳盈特创智能科技有限公司 | A kind of power supply circuit for single-chip microcomputer |
| CN110230436B (en) * | 2019-05-23 | 2020-04-07 | 南京理工大学 | Control and telemetering circuit applied to cube star separation device |
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| CN102662424A (en) | 2012-09-12 |
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