CN102662424A - Precise voltage stabilizing circuit for singlechip - Google Patents
Precise voltage stabilizing circuit for singlechip Download PDFInfo
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- CN102662424A CN102662424A CN2012100813277A CN201210081327A CN102662424A CN 102662424 A CN102662424 A CN 102662424A CN 2012100813277 A CN2012100813277 A CN 2012100813277A CN 201210081327 A CN201210081327 A CN 201210081327A CN 102662424 A CN102662424 A CN 102662424A
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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 the electronic circuit technology field, relate to a kind of mu balanced circuit, be specifically related to a kind of single-chip microcomputer and use accurate mu balanced circuit.
Background technology
Single-chip microcomputer complete machine power supply is very important in single-chip microcomputer is used the 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 power source voltage fast Time Created, 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 relatively 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 to use accurate mu balanced circuit in view of the above, in order to rationally to measure the characteristic of cooperation wireless channel exactly.
For realizing above-mentioned purpose and other relevant purposes, the present invention provides a kind of single-chip microcomputer to use accurate mu balanced circuit.
A kind of single-chip microcomputer is used accurate mu balanced circuit, and said single-chip microcomputer comprises the main operating circuit that links to each other with single-chip microcomputer with accurate mu balanced circuit; Said 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 through a resistance R 7, and the in-phase input end of amplifier U1 is through a resistance R 8 ground connection, and the output terminal of amplifier U1 connects the base stage of triode Q2 through 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 the initial piezoelectric voltage that goes up.
As a kind of preferred version of the present invention, the collector of said triode Q2 is through a Voltage stabilizing module ground connection; Said Voltage stabilizing module is made up of the stabilivolt and the electric capacity of parallel connection.
As another kind of preferred version of the present invention, the base stage of said triode Q2 connects the emitter of triode Q2 through a resistance R 4.
As another preferred version of the present invention, be connected a filter capacitor C1 between the output terminal of the inverting input of said amplifier U1 and amplifier U1; The in-phase input end of amplifier U1 links to each other with the collector of triode Q2 through a resistance R 9.
As another preferred version of the present invention, the said initial piezoelectric voltage that goes up is provided by the circuit that initially powers on, and the said circuit that initially powers on comprises resistance R 3, R5, stabilivolt Z2, capacitor C 3 and diode D1; One termination voltage input end of said resistance R 3, the end of the other end connecting resistance R5 of resistance R 3, the other end ground connection of resistance R 5; Said stabilivolt Z2 and capacitor C 3 are all parallelly connected with resistance R 5; The other end of said resistance R 3 also connects the positive pole of diode D1; The negative pole of said diode D1 connects the power input of single-chip microcomputer.
As another preferred version of the present invention, said single-chip microcomputer also comprises the overvoltage crowbar that links to each other with the emitter of triode Q2 with accurate mu balanced circuit; Said overvoltage crowbar comprises a triode Q1; The collector of triode Q1 connects voltage input end through a resistance R 1; The emitter of triode Q1 connects the emitter of said triode Q2; The base stage of triode Q1 is through a voltage stabilizer Z1 ground connection, and the base stage of triode Q1 also connects voltage input end through a resistance R 2.
As stated, single-chip microcomputer of the present invention is used accurate mu balanced circuit, has following beneficial effect:
Single-chip microcomputer of the present invention is low with the mu balanced circuit cost than existing single-chip microcomputer with accurate mu balanced circuit, and voltage regulation result is suitable with the LDO effect, and can satisfy the power demands of single-chip microcomputer.
Description of drawings
Fig. 1 is the circuit theory diagrams of single-chip microcomputer of the present invention with accurate mu balanced circuit.
Fig. 2 is the circuit theory diagrams of the circuit that initially powers on 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 through specific instantiation embodiment of the present invention is described, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this instructions disclosed.The present invention can also implement or use through other different embodiment, and each item details in this instructions also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
See also accompanying drawing.Need to prove; The diagram that is provided in the present embodiment is only explained basic conception of the present invention in a schematic way; Satisfy only show in graphic with the present invention in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
The invention provides a kind of single-chip microcomputer and use accurate mu balanced circuit, this circuit comprises amplifier, single-chip microcomputer (MCU), triode, stabilivolt, resistance, electric capacity, power supply.The present invention utilizes the reference voltage of the kernel reference power supply+2.5V of singlechip as integrated operational amplifier circuit, gives single-chip microcomputer (MCU) power supply again through amplifier control triode Q2 output acquisition+5V voltage, forms a closed loop circuit.Be characterized in obtaining the voltage of a precision through amplifier.
Do further explain below in conjunction with the accompanying drawing specific embodiments of the invention.
Embodiment
Present embodiment provides a kind of single-chip microcomputer to use accurate mu balanced circuit, and is as shown in Figure 1, and said single-chip microcomputer comprises the main operating circuit that links to each other with single-chip microcomputer and the circuit that initially powers on accurate mu balanced circuit, and the overvoltage crowbar that links to each other with main operating circuit.
As illustrated in fig. 1 and 2, the said circuit that initially powers on comprises resistance R 3, R5, stabilivolt Z2, capacitor C 3 and diode D1; One termination voltage input end (Vin) of said resistance R 3, the end of the other end connecting resistance R5 of resistance R 3, the other end ground connection of resistance R 5; Said stabilivolt Z2 and capacitor C 3 are all parallelly connected with resistance R 5; The other end of said resistance R 3 also connects the positive pole of diode D1; The negative pole of said diode D1 connects the power input of single-chip microcomputer.The said circuit that initially powers on provides the initial piezoelectric voltage that goes up to single-chip microcomputer.
When initially powering on, single-chip microcomputer (MCU) does not have the reference voltage of output+2.5V, so main operating circuit (discharge circuit) is not worked at the voltage input end (Vin) of the circuit that initially powers on.At this moment the circuit that initially powers on obtains one greater than the voltage of 2.5V less than 5.1V through R3 and R5 dividing potential drop, and this voltage is that single-chip microcomputer (MCU) provides initial power supply through diode D1, and this moment, the single-chip microcomputer kernel just can produce a stable+2.5V reference voltage.
As shown in figs. 1 and 3, said 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 through a resistance R 7, and the in-phase input end of amplifier U1 is through a resistance R 8 ground connection, and the output terminal of amplifier U1 connects the base stage of triode Q2 through 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 the initial piezoelectric voltage that goes up.The collector of said triode Q2 is through a Voltage stabilizing module ground connection; Said Voltage stabilizing module is made up of the stabilivolt and the electric capacity of parallel connection.The base stage of said triode Q2 connects the emitter of triode Q2 through a resistance R 4; Said resistance R 4 is connected with capacitor C 6.Be connected a filter capacitor C1 between the output terminal of the inverting input of said amplifier U1 and amplifier U1; The in-phase input end of amplifier U1 links to each other with the collector of triode Q2 through a resistance R 9.
After the inverting input of amplifier U1 adds the reference voltage of one+2.5V, according to the amplifier principle of work, also can produce+voltage of 2.5V at the 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
This 5V voltage produces the back and gives single-chip microcomputer (MCU) power supply, and this moment, diode D1 cut off the power supply of the circuit that initially powers on, and makes single-chip microcomputer (MCU) keep the less 5V power supply power supply of a steady ripple.
As shown in figs. 1 and 4; Said overvoltage crowbar comprises a triode Q1; The collector of triode Q1 connects voltage input end through a resistance R 1; The emitter of triode Q1 connects the emitter of said triode Q2, and the base stage of triode Q1 is through a voltage stabilizer Z1 ground connection, and the base stage of triode Q1 also connects voltage input end (Vin) through a resistance R 2.
For preventing that input voltage vin is too high triode Q2 in the main operating circuit is damaged, so add the overvoltage crowbar that a large power triode Q1 constitutes at triode Q2 front end.Utilize emitter follower circuit to produce the voltage about one+8.5V at the emitter of triode Q1, this voltage is whole main operating circuit power supply.
Single-chip microcomputer of the present invention is low with the mu balanced circuit cost than existing single-chip microcomputer with accurate mu balanced circuit, and voltage regulation result is suitable with the LDO effect, and can satisfy the power demands of single-chip microcomputer.
So the present invention has effectively overcome various shortcoming of the prior art and the tool high industrial utilization.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any be familiar with this technological personage all can be under spirit of the present invention and category, the foregoing description is modified or is changed.Therefore, have common knowledge the knowledgeable in the affiliated such as technical field, must contain by claim of the present invention not breaking away from all equivalence modifications of being accomplished under disclosed spirit and the technological thought or changing.
Claims (6)
1. a single-chip microcomputer is used accurate mu balanced circuit, it is characterized in that: said single-chip microcomputer comprises the main operating circuit that links to each other with single-chip microcomputer with accurate mu balanced circuit; Said 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 through a resistance R 7, and the in-phase input end of amplifier U1 is through a resistance R 8 ground connection, and the output terminal of amplifier U1 connects the base stage of triode Q2 through 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 the initial piezoelectric voltage that goes up.
2. single-chip microcomputer according to claim 1 is used accurate mu balanced circuit, it is characterized in that: the collector of said triode Q2 is through a Voltage stabilizing module ground connection; Said Voltage stabilizing module is made up of the stabilivolt and the electric capacity of parallel connection.
3. single-chip microcomputer according to claim 1 is used accurate mu balanced circuit, it is characterized in that: the base stage of said triode Q2 connects the emitter of triode Q2 through a resistance R 4.
4. single-chip microcomputer according to claim 1 is used accurate mu balanced circuit, it is characterized in that: be connected a filter capacitor C1 between the output terminal of the inverting input of said amplifier U1 and amplifier U1; The in-phase input end of amplifier U1 links to each other with the collector of triode Q2 through a resistance R 9.
5. single-chip microcomputer according to claim 1 is used accurate mu balanced circuit, it is characterized in that: the said initial piezoelectric voltage that goes up is provided by the circuit that initially powers on, and the said circuit that initially powers on comprises resistance R 3, R5, stabilivolt Z2, capacitor C 3 and diode D1; One termination voltage input end of said resistance R 3, the end of the other end connecting resistance R5 of resistance R 3, the other end ground connection of resistance R 5; Said stabilivolt Z2 and capacitor C 3 are all parallelly connected with resistance R 5; The other end of said resistance R 3 also connects the positive pole of diode D1; The negative pole of said diode D1 connects the power input of single-chip microcomputer.
6. single-chip microcomputer according to claim 1 is used accurate mu balanced circuit, it is characterized in that: said single-chip microcomputer also comprises the overvoltage crowbar that links to each other with the emitter of triode Q2 with accurate mu balanced circuit; Said overvoltage crowbar comprises a triode Q1; The collector of triode Q1 connects voltage input end through a resistance R 1; The emitter of triode Q1 connects the emitter of said triode Q2; The base stage of triode Q1 is through a voltage stabilizer Z1 ground connection, and the base stage of triode Q1 also connects voltage input end through 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 |
|---|---|---|---|
| CN201210081327.7A CN102662424B (en) | 2012-03-23 | 2012-03-23 | Precise voltage stabilizing circuit for singlechip |
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| CN102662424A true CN102662424A (en) | 2012-09-12 |
| CN102662424B CN102662424B (en) | 2014-12-03 |
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| CN201210081327.7A Expired - Fee Related CN102662424B (en) | 2012-03-23 | 2012-03-23 | Precise voltage stabilizing circuit for singlechip |
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Cited By (2)
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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 |
| CN110230436A (en) * | 2019-05-23 | 2019-09-13 | 南京理工大学 | A kind of control and telemetric circuit applied to cube star separator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Cited By (2)
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| CN110230436A (en) * | 2019-05-23 | 2019-09-13 | 南京理工大学 | A kind of control and telemetric circuit applied to cube star separator |
Also Published As
| Publication number | Publication date |
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| CN102662424B (en) | 2014-12-03 |
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