CN104135150B - A kind of power circuit - Google Patents
A kind of power circuit Download PDFInfo
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- CN104135150B CN104135150B CN201310160581.0A CN201310160581A CN104135150B CN 104135150 B CN104135150 B CN 104135150B CN 201310160581 A CN201310160581 A CN 201310160581A CN 104135150 B CN104135150 B CN 104135150B
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Abstract
The embodiment of the invention discloses a kind of power circuit, including：First power module, it is connected respectively with voltage input end, voltage output end and ground, for when load current is less than predetermined current, exporting the load current；Second source module, it is connected between the voltage input end and ground, for when the load current reaches the predetermined current, exporting the load current；Handover module is switched, is connected respectively with the voltage input end, first power module and the second source module, the load current is exported for when the load current reaches the predetermined current, switching to the second source module.Using the present invention, the steady operation of load according to the size of load current, auto switching electric source circuit, can be kept, circuit structure is simple, and cost is low.
Description
Technical field
The present invention relates to electronic applications, more particularly to a kind of power circuit.
Background technology
In electronic circuit field, working foundation of the power circuit as other circuits, it uses extremely wide.Especially open
Powered-down source and linear stabilized power supply are very important as most common, frequency of use highest power circuit, its effect.But
In the prior art, both power circuits are typically separate what is existed alone and work, if when circuit load electric current is smaller,
Linear stabilized power supply can be used, but in heavier loads, is continued if using linear stabilized power supply, the loss of circuit and hair
Heat will be larger, it is therefore desirable to Switching Power Supply is switched to when load current is higher to reduce the loss of circuit and caloric value, this
, it is necessary to be independently arranged two kinds of power circuits in circuit and manually select switching if sample, circuit structure is complicated, and cost is higher,
And switching is also inconvenient.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is, there is provided a kind of power circuit.Can be according to load current
Size, auto switching electric source circuit, the steady operation of load is kept, circuit structure is simple, and cost is low.
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of protection circuit, including：
First power module, it is connected respectively with voltage input end, voltage output end and ground, it is pre- for being less than in load current
If during electric current, export the load current；
Second source module, it is connected between the voltage input end and ground, for reaching described in the load current
During predetermined current, the load current is exported；
Switch handover module, respectively with the voltage input end, first power module and the second source module
It is connected, the load is exported for when the load current reaches the predetermined current, switching to the second source module
Electric current.
Wherein, first power module includes the first divider resistance and voltage-stablizer, one end of first divider resistance
The voltage input end, the input of another termination voltage-stablizer are connect, the output of the voltage-stablizer terminates the voltage output
End.
Wherein, first power module also includes the second divider resistance, the 3rd divider resistance, and the voltage-stablizer is three ends
Voltage-stablizer, described second divider resistance one end connects the voltage input end by the switch handover module, described in another termination
The common node of 3rd divider resistance, the 3rd divider resistance and second divider resistance connects the tune of the three terminal regulator
Whole end, other end ground connection.
Wherein, the second source module includes energy-storage units and discharge cell, and the discharge cell is connected to the storage
The both ends of energy unit, the public section of the first termination switch handover module and second divider resistance of the energy-storage units
Point, the second termination voltage output end.
Wherein, the energy-storage units include energy storage inductor, and the discharge cell includes discharge capacity and diode, the storage
The common node of the first termination switch handover module and second divider resistance of energy inductance, the second termination electric discharge
The positive pole of electric capacity, the negative pole of the discharge capacity connect the positive pole of the diode, the plus earth of the diode, and negative pole meets institute
State the first end of energy storage inductor.
Wherein, the switch handover module includes switch triode, and the emitter stage of the switch triode connects described first
The common node of divider resistance and the voltage input end, colelctor electrode connect second divider resistance and the diode cathode
Common node, base stage connect the input of first divider resistance and the three terminal regulator.
Wherein, the circuit also includes filter capacitor, and the positive pole of the filter capacitor connects the voltage input end, and negative pole connects
Ground.
Wherein, the three terminal regulator is three-port variable voltage regulator.
Wherein, the model 7805 of the three-port variable voltage regulator.
Wherein, the model IN4007 of the diode.
Implement the embodiment of the present invention, have the advantages that：
Voltage-stabilized power supply and Switching Power Supply are integrated in a power circuit, switch to voltage stabilizing electricity when the load electric current is small
Source works, and when load current is larger, switches to Switching Power Supply work, avoid load current it is larger when whole power circuit
Loss and caloric value, have good protective effect to circuit, circuit structure is simple, and cost is low, in that context it may be convenient to according to load
Electric current is automatically switched.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the connection diagram of the first embodiment of power circuit of the present invention；
Fig. 2 is the circuit diagram of the second embodiment of power circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1 is refer to, is the connection diagram of the first embodiment of power circuit of the present invention, it is in the present embodiment, described
Circuit includes：First power module 1, second source module 2, switch handover module 3.
First power module 1 is connected with voltage input end, voltage output end and ground respectively, for small in load current
When predetermined current, the load current is exported；
The second source module 2 is connected between the voltage input end and ground, for reaching in the load current
During the predetermined current, the load current is exported；
It is described switch handover module 3 respectively with the voltage input end, first power module 1 and the second source
Module 2 is connected, and institute is exported for when the load current reaches the predetermined current, switching to the second source module 2
State load current.
By the way that two kinds of power modules are integrated in a power circuit, the first power supply is switched to when the load electric current is small
Module work, when load current is larger, switch to second source module work, avoid load current it is larger when whole power supply
The loss of circuit and caloric value, there is good protective effect to circuit.
Fig. 2 is refer to, is the circuit diagram of the second embodiment of power circuit of the present invention, it is in the present embodiment, described
Circuit includes：First power module, second source module, switch handover module.
Specifically, first power module can include the first divider resistance R1 and voltage-stablizer Q, the first partial pressure electricity
Hinder the R1 termination voltage input end Vin, another termination voltage-stablizer Q input, the output end of the voltage-stablizer Q
Meet the voltage output end Vout.
Preferably, first power module can also include the second divider resistance R2, the 3rd divider resistance R3, described steady
Depressor Q is three terminal regulator, and described second divider resistance R2 one end connects the voltage input end by the switch handover module
Vin, another termination the 3rd divider resistance R3, the 3rd divider resistance R3 and the second divider resistance R2 public section
Point connects the adjustment end of the three terminal regulator Q, other end ground connection.
The second source module can include energy-storage units and discharge cell, and the discharge cell is connected to the energy storage
The both ends of unit, the public section of the first termination switch handover module and the second divider resistance R2 of the energy-storage units
Point, the second termination voltage output end Vout.
Preferably, the energy-storage units can include energy storage inductor L, the discharge cell can include discharge capacity C1 and
The public section of diode VD, the energy storage inductor L the first termination switch handover module and the second divider resistance R2
Point, the second termination discharge capacity C1 positive pole, the negative pole of the discharge capacity C1 connects the positive pole of the diode VD, described
Diode VD plus earth, negative pole connect the first end of the energy storage inductor L.
The switch handover module can connect described the including switch triode VT, the switch triode VT emitter stage
One divider resistance R1 and voltage input end Vin common node, colelctor electrode meet the second divider resistance R2 and described two
The common node of pole pipe VD negative poles, base stage connect the first divider resistance R1 and the three terminal regulator Q input.
The circuit can also meet the voltage input end Vin including filter capacitor C2, the filter capacitor C2 positive pole,
Negative pole is grounded.
It is highly preferred that the three terminal regulator Q is three-port variable voltage regulator.The model of the three-port variable voltage regulator
7805。
The model IN4007 of the diode VD.
Lower mask body introduces the course of work of power circuit in the present embodiment：
In the present embodiment, power circuit is made up of three-port variable voltage regulator 7805 low current linear stabilized power supply and by
The Switching Power Supply composition of high power switch triode VT compositions.Certainly, the two power supplys are not self-existent to switch three poles
Pipe VT switch equally has influence to 7805 working condition.In whole power circuit, 7805 and R1, R2, R3 composition one
Individual 5V linear stabilized power supply, the critical point of whole power circuit state conversion is set by R1.For example, selected in this power circuit
The R1 selected is 10 ohm, if the electric current for flowing through R1 is less than 70mA, the pressure drop on R1 is less than 0.7V, and switch triode VT is in
Cut-off state and do not work.Therefore when load current is less than 70mA, power circuit is one and is responsible for adjustment voltage by 7805
Linear stabilized power supply.
And when load current reaches 70mA, the pressure drop on R1 is more than 0.7V, switch triode VT conductings, load current warp
Energy storage inductor L flow direction loads.While VT is turned on, adjustment end of its collector voltage through R2, R3 partial pressure to 7805, make its defeated
Go out voltage and be higher than 5V.7805 electric current to be flowed through to reduce, the pressure drop on R1 also reduces, when voltage drop drops below 5V, its
It is not enough to maintain VT conducting, VT cut-offs, energy storage inductor L discharges the magnetic field energy of its storage through VD, C2, is output to load.Together
When, 7805 adjustment end restPoses because of VT cut-off, and its output voltage returns to 5V, flows through its electric current rise, R1
On pressure drop turn on VT again, power circuit repeat above procedure.So as to realize the size according to load current, when load electricity
When flowing larger, be switched to Switching Power Supply, when the load electric current is small, be switched to voltage-stabilized power supply, avoid load current it is larger when
The loss of whole power circuit and caloric value, there is good protective effect to circuit, and using the switch three in Switching Power Supply
Pole pipe is as switch switching part, and without increasing new element, circuit structure is simple, and cost is low, in that context it may be convenient to according to load
Electric current is automatically switched.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference with other embodiments, between each embodiment identical similar part mutually referring to.
For device embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, related part referring to
The part explanation of embodiment of the method.
By the description of above-described embodiment, the present invention has advantages below：
Pulse voltage is produced by self-oscillation module and triggers lamp tube starting, and sets protection module to prevent overtension pair
Fluorescent tube causes to damage, and improves safety and stability when fluorescent tube uses, and extends the service life of fluorescent tube；Temperature-sensitive electricity is set
Resistance is protected to fluorescent tube, takes full advantage of the heat sensitive properties of thermistor, whole circuit structure is simple, stable performance, it is ensured that
The normal use of light fixture during user live and work.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory（Read-Only Memory, abbreviation ROM）Or random access memory（Random
Access Memory, abbreviation RAM）Deng.
Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (4)
- A kind of 1. power circuit, it is characterised in that including：First power module, it is connected respectively with voltage input end, voltage output end and ground, for being less than default electricity in load current During stream, the load current is exported；Second source module, it is connected between the voltage input end and ground, for reaching described default in the load current During electric current, the load current is exported；Handover module is switched, is connected respectively with the voltage input end, first power module and the second source module, The load current is exported for when the load current reaches the predetermined current, switching to the second source module；First power module includes the first divider resistance and voltage-stablizer, the termination voltage of first divider resistance Input, the input of another termination voltage-stablizer, the output of the voltage-stablizer terminate the voltage output end；First power module also includes the second divider resistance, the 3rd divider resistance, and the voltage-stablizer is three terminal regulator, institute State second divider resistance one end and the voltage input end, another termination the 3rd partial pressure electricity are connect by the switch handover module The common node of resistance, the 3rd divider resistance and second divider resistance connects the adjustment end of the three terminal regulator, another End ground connection；The second source module includes energy-storage units and discharge cell, and the discharge cell is connected to the two of the energy-storage units End, the first termination switch handover module and the common node of second divider resistance, the second end of the energy-storage units Connect the voltage output end；The energy-storage units include energy storage inductor, and the discharge cell includes discharge capacity and diode, the energy storage inductor The common node of the first termination switch handover module and second divider resistance, the second termination discharge capacity is just Pole, the negative pole of the discharge capacity connect the positive pole of the diode, the plus earth of the diode, and negative pole connects the energy storage electricity The first end of sense；The switch handover module includes switch triode, the emitter stage of the switch triode connect first divider resistance and The common node of the voltage input end, colelctor electrode connect the common node of second divider resistance and the diode cathode, Base stage connects the input of first divider resistance and the three terminal regulator；The circuit also includes filter capacitor, and the positive pole of the filter capacitor connects the voltage input end, negative pole ground connection.
- 2. circuit as claimed in claim 1, it is characterised in that the three terminal regulator is three-port variable voltage regulator.
- 3. circuit as claimed in claim 2, it is characterised in that the model 7805 of the three-port variable voltage regulator.
- 4. circuit as claimed in claim 3, it is characterised in that the model IN4007 of the diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310160581.0A CN104135150B (en) | 2013-05-03 | 2013-05-03 | A kind of power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310160581.0A CN104135150B (en) | 2013-05-03 | 2013-05-03 | A kind of power circuit |
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| Publication Number | Publication Date |
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| CN104135150A CN104135150A (en) | 2014-11-05 |
| CN104135150B true CN104135150B (en) | 2017-11-21 |
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| CN201310160581.0A Active CN104135150B (en) | 2013-05-03 | 2013-05-03 | A kind of power circuit |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108258904A (en) * | 2017-12-01 | 2018-07-06 | 珠海格力电器股份有限公司 | Direct current power supply and power supply method thereof |
| CN108621991B (en) * | 2018-04-27 | 2020-11-06 | 北京新能源汽车股份有限公司 | Vehicle and power supply device |
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| CN101135986A (en) * | 2006-09-01 | 2008-03-05 | 鸿富锦精密工业（深圳）有限公司 | Interface power consumption test card |
| CN201522606U (en) * | 2009-11-02 | 2010-07-07 | 北京空间机电研究所 | Eccentrically-arranged power supply circuit of remote sensing CCD camera |
| CN101976946A (en) * | 2010-10-29 | 2011-02-16 | 华南理工大学 | Circuit and method for transforming negative voltage between direct currents |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002258957A (en) * | 2001-03-02 | 2002-09-13 | Ricoh Co Ltd | Fet driving circuit |
| CN200953533Y (en) * | 2006-05-08 | 2007-09-26 | 大连光洋科技工程有限公司 | Digital control special electric source |
| JP2008225952A (en) * | 2007-03-14 | 2008-09-25 | Ricoh Co Ltd | Voltage regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101135986A (en) * | 2006-09-01 | 2008-03-05 | 鸿富锦精密工业（深圳）有限公司 | Interface power consumption test card |
| CN201522606U (en) * | 2009-11-02 | 2010-07-07 | 北京空间机电研究所 | Eccentrically-arranged power supply circuit of remote sensing CCD camera |
| CN101976946A (en) * | 2010-10-29 | 2011-02-16 | 华南理工大学 | Circuit and method for transforming negative voltage between direct currents |
Non-Patent Citations (1)
| Title |
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| 基于FPGA的复合型稳压源的研究与设计;马秋芝;《中国优秀硕士学位论文全文数据库工程科技II辑》;20130215(第2013年第02期);正文第15页至第16页，第31页及图3.3、4.10 * |
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