CN104135150A - Power circuit - Google Patents
Power circuit Download PDFInfo
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- CN104135150A CN104135150A CN201310160581.0A CN201310160581A CN104135150A CN 104135150 A CN104135150 A CN 104135150A CN 201310160581 A CN201310160581 A CN 201310160581A CN 104135150 A CN104135150 A CN 104135150A
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- divider resistance
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Abstract
The embodiment of the invention discloses a power circuit which comprises a first power module, a second power module and a switch switching module, wherein the first power module is connected with a voltage input end, a voltage output end and ground and used for outputting a load current when the load current is lower than a preset current; the second power module is connected between the voltage input end and the ground and used for outputting the load current when the load current reaches the preset current; and the switch switching module is connected with the voltage input end, the first power module and the second power module and used for switching to the second power module so as to output the load current when the load current reaches the preset current. With the adoption of the power circuit, the power circuit can be automatically switched according to the size of the load current, stable working of a load is kept, and the power circuit is simple in structure and low in cost.
Description
Technical field
The present invention relates to electronic applications, relate in particular to a kind of power circuit.
Background technology
In electronic circuit field, power circuit is as the working foundation of other circuit, and its use is very extensive.Especially Switching Power Supply and linear stabilized power supply be as the most common, the power circuit that frequency of utilization is the highest, and its effect is very important.But, in the prior art, these two kinds of power circuits are generally separated to be existed alone and works, if at circuit load electric current hour, can adopt linear stabilized power supply, but when load is heavier, continue to adopt the words of linear stabilized power supply, the loss of circuit and caloric value will be larger, therefore need to when load current is higher, switch to Switching Power Supply to reduce loss and the caloric value of circuit, like this, two kinds of power circuits need to be independently set in circuit and manually select and switch, circuit structure is complicated, and cost is higher, and switches also inconvenient.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, a kind of power circuit is provided.Can be according to the size of load current, auto switching electric source circuit, keeps the steady operation of load, and circuit structure is simple, and cost is low.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of protective circuit, comprising:
The first power module, is connected with voltage input end, voltage output end and ground respectively, for when load current is less than predetermined current, exports described load current;
Second source module, is connected between described voltage input end and ground, for when described load current reaches described predetermined current, exports described load current;
Switching over module, is connected with described voltage input end, described the first power module and described second source module respectively, for when described load current reaches described predetermined current, switches to described second source module and exports described load current.
Wherein, described the first power module comprises the first divider resistance and pressurizer, voltage input end described in a termination of described the first divider resistance, the input of pressurizer described in another termination, voltage output end described in the output termination of described pressurizer.
Wherein, described the first power module also comprises the second divider resistance, the 3rd divider resistance, described pressurizer is three terminal regulator, described second divider resistance one end connects described voltage input end by described switching over module, the 3rd divider resistance described in another termination, the common node of described the 3rd divider resistance and described the second divider resistance connects the adjustment end of described three terminal regulator, other end ground connection.
Wherein, described second source module comprises energy-storage units and discharge cell, described discharge cell is connected to the two ends of described energy-storage units, the common node of switching over module and described the second divider resistance described in the first termination of described energy-storage units, voltage output end described in the second termination.
Wherein, described energy-storage units comprises energy storage inductor, described discharge cell comprises discharge capacity and diode, the common node of switching over module and described the second divider resistance described in the first termination of described energy storage inductor, the positive pole of discharge capacity described in the second termination, the negative pole of described discharge capacity connects the positive pole of described diode, the plus earth of described diode, and negative pole connects the first end of described energy storage inductor.
Wherein, described switching over module comprises switch triode, the emitter of described switch triode connects the common node of described the first divider resistance and described voltage input end, collector electrode connects the common node of described the second divider resistance and described diode cathode, and base stage connects the input of described the first divider resistance and described three terminal regulator.
Wherein, described circuit also comprises filter capacitor, and the positive pole of described filter capacitor connects described voltage input end, minus earth.
Wherein, described three terminal regulator is three-port variable voltage regulator.
Wherein, the model of described three-port variable voltage regulator is 7805.
Wherein, the model of described diode is IN4007.
Implement the embodiment of the present invention, there is following beneficial effect:
Stabilized voltage power supply and Switching Power Supply are integrated in a power circuit; when load current hour switches to stabilized voltage power supply work; when load current is larger; switch to Switching Power Supply work; while having avoided load current larger, loss and the caloric value of whole power circuit, have good protective effect to circuit, and circuit structure is simple; cost is low, can according to load current, automatically switch easily.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Please refer to Fig. 1, is the connection diagram of the first embodiment of power circuit of the present invention, and in the present embodiment, described circuit comprises: the first power module 1, second source module 2, switching over module 3.
Described the first power module 1 is connected with voltage input end, voltage output end and ground respectively, for when load current is less than predetermined current, exports described load current;
Described second source module 2 is connected between described voltage input end and ground, for when described load current reaches described predetermined current, exports described load current;
Described switching over module 3 is connected with described voltage input end, described the first power module 1 and described second source module 2 respectively, for when described load current reaches described predetermined current, switches to the described load current of described second source module 2 output.
By two kinds of power modules are integrated in a power circuit; when load current hour switches to the first power module work; when load current is larger; switch to the work of second source module; while having avoided load current larger, loss and the caloric value of whole power circuit, have good protective effect to circuit.
Please refer to Fig. 2, is the circuit diagram of the second embodiment of power circuit of the present invention, and in the present embodiment, described circuit comprises: the first power module, second source module, switching over module.
Particularly, described the first power module can comprise the first divider resistance R1 and pressurizer Q, voltage input end Vin described in a termination of described the first divider resistance R1, the input of pressurizer Q described in another termination, voltage output end Vout described in the output termination of described pressurizer Q.
Preferably, described the first power module can also comprise the second divider resistance R2, the 3rd divider resistance R3, described pressurizer Q is three terminal regulator, described second divider resistance R2 one end meets described voltage input end Vin by described switching over module, the 3rd divider resistance R3 described in another termination, the common node of described the 3rd divider resistance R3 and described the second divider resistance R2 connects the adjustment end of described three terminal regulator Q, other end ground connection.
Described second source module can comprise energy-storage units and discharge cell, described discharge cell is connected to the two ends of described energy-storage units, the common node of switching over module and described the second divider resistance R2 described in the first termination of described energy-storage units, voltage output end Vout described in the second termination.
Preferably, described energy-storage units can comprise energy storage inductor L, described discharge cell can comprise discharge capacity C1 and diode VD, the common node of switching over module and described the second divider resistance R2 described in the first termination of described energy storage inductor L, the positive pole of discharge capacity C1 described in the second termination, the negative pole of described discharge capacity C1 connects the positive pole of described diode VD, the plus earth of described diode VD, and negative pole connects the first end of described energy storage inductor L.
Described switching over module can comprise switch triode VT, the emitter of described switch triode VT connects the common node of described the first divider resistance R1 and described voltage input end Vin, collector electrode connects the common node of described the second divider resistance R2 and described diode VD negative pole, and base stage connects the input of described the first divider resistance R1 and described three terminal regulator Q.
Described circuit can also comprise filter capacitor C2, and the positive pole of described filter capacitor C2 connects described voltage input end Vin, minus earth.
More preferably, described three terminal regulator Q is three-port variable voltage regulator.The model of described three-port variable voltage regulator is 7805.
The model of described diode VD is IN4007.
Lower mask body is introduced the course of work of power circuit in the present embodiment:
In the present embodiment, the little electric current linear stabilized power supply that power circuit consists of three-port variable voltage regulator 7805 and the Switching Power Supply being comprised of high power switch triode VT form.Certainly, these two power supplys are not self-existent, and the switch of switch triode VT has impact equally on 7805 operating state.In whole power circuit, 7805 and R1, R2, R3 form the linear stabilized power supply of a 5V, by R1, set the critical point of whole power circuit state conversion.For example, the R1 selecting in this power circuit is 10 ohm, if when flowing through the electric current of R1 and being less than 70mA, the pressure drop on R1 is less than 0.7V, switch triode VT is in cut-off state and inoperative.Therefore when load current is less than 70mA, power circuit be one by 7805 linear stabilized power supplies of being responsible for adjusting voltages.
And when load current reaches 70mA, the pressure drop on R1 is greater than 0.7V, switch triode VT conducting, load current flows to load through energy storage inductor L.In VT conducting, its collector voltage divides the adjustment end that is depressed into 7805 through R2, R3, make its output voltage higher than 5V.Flow through 7805 electric current and reduce, the pressure drop on R1 also reduces, and when voltage drop is reduced to while being less than 5V, it is not enough to maintain the conducting of VT, VT cut-off, and the magnetic field energy that energy storage inductor L discharges its storage through VD, C2, outputs to load.Meanwhile, 7805 adjustment end restPoses because of the cut-off of VT, and its output voltage is got back to 5V, and the electric current that flows through it raises, and the pressure drop on R1 makes VT conducting again, and power circuit repeats above process.Thereby realize according to the size of load current; when load current is larger, be switched to Switching Power Supply, when load current hour; be switched to stabilized voltage power supply; while having avoided load current larger, loss and the caloric value of whole power circuit, have good protective effect to circuit, and the switch triode in employing Switching Power Supply is as switching over parts; without increasing new element; circuit structure is simple, and cost is low, can according to load current, automatically switch easily.
It should be noted that, each embodiment in this specification all adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, 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, relevant part is referring to the part explanation of embodiment of the method.
By the description of above-described embodiment, the present invention has the following advantages:
By self-oscillation module, produce pulse voltage and trigger lamp tube starting, and protection module is set prevents that overtension from causing damage to fluorescent tube, improved safety and stability when fluorescent tube is used, extended the useful life of fluorescent tube; Thermistor is set fluorescent tube is protected, take full advantage of the temperature-sensitive attribute of thermistor, whole circuit structure is simple, stable performance, the normal use of light fixture while having guaranteed user's live and work.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, to come the hardware that instruction is relevant to complete by computer program, described program can be stored in a computer read/write memory medium, this program, when carrying out, can comprise as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory is called for short ROM) or random store-memory body (Random Access Memory is called for short RAM) etc.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (10)
1. a power circuit, is characterized in that, comprising:
The first power module, is connected with voltage input end, voltage output end and ground respectively, for when load current is less than predetermined current, exports described load current;
Second source module, is connected between described voltage input end and ground, for when described load current reaches described predetermined current, exports described load current;
Switching over module, is connected with described voltage input end, described the first power module and described second source module respectively, for when described load current reaches described predetermined current, switches to described second source module and exports described load current.
2. circuit as claimed in claim 1, it is characterized in that, described the first power module comprises the first divider resistance and pressurizer, voltage input end described in a termination of described the first divider resistance, the input of pressurizer described in another termination, voltage output end described in the output termination of described pressurizer.
3. circuit as claimed in claim 2, it is characterized in that, described the first power module also comprises the second divider resistance, the 3rd divider resistance, described pressurizer is three terminal regulator, described second divider resistance one end connects described voltage input end by described switching over module, the 3rd divider resistance described in another termination, the common node of described the 3rd divider resistance and described the second divider resistance connects the adjustment end of described three terminal regulator, other end ground connection.
4. circuit as claimed in claim 3, it is characterized in that, described second source module comprises energy-storage units and discharge cell, described discharge cell is connected to the two ends of described energy-storage units, the common node of switching over module and described the second divider resistance described in the first termination of described energy-storage units, voltage output end described in the second termination.
5. circuit as claimed in claim 4, it is characterized in that, described energy-storage units comprises energy storage inductor, described discharge cell comprises discharge capacity and diode, the common node of switching over module and described the second divider resistance described in the first termination of described energy storage inductor, the positive pole of discharge capacity described in the second termination, the negative pole of described discharge capacity connects the positive pole of described diode, the plus earth of described diode, negative pole connects the first end of described energy storage inductor.
6. circuit as claimed in claim 5, it is characterized in that, described switching over module comprises switch triode, the emitter of described switch triode connects the common node of described the first divider resistance and described voltage input end, collector electrode connects the common node of described the second divider resistance and described diode cathode, and base stage connects the input of described the first divider resistance and described three terminal regulator.
7. circuit as claimed in claim 6, is characterized in that, described circuit also comprises filter capacitor, and the positive pole of described filter capacitor connects described voltage input end, minus earth.
8. circuit as claimed in claim 7, is characterized in that, described three terminal regulator is three-port variable voltage regulator.
9. circuit as claimed in claim 8, is characterized in that, the model of described three-port variable voltage regulator is 7805.
10. circuit as claimed in claim 9, is characterized in that, the model of described diode is IN4007.
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 |
Publications (2)
| Publication Number | Publication Date |
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| CN104135150A true CN104135150A (en) | 2014-11-05 |
| CN104135150B CN104135150B (en) | 2017-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310160581.0A Active CN104135150B (en) | 2013-05-03 | 2013-05-03 | A kind of power circuit |
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| CN (1) | CN104135150B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108258904A (en) * | 2017-12-01 | 2018-07-06 | 珠海格力电器股份有限公司 | DC power supply and its method of supplying power to |
| CN108621991A (en) * | 2018-04-27 | 2018-10-09 | 北京新能源汽车股份有限公司 | Vehicle and supply unit |
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Cited By (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 | DC power supply and its method of supplying power to |
| CN108621991A (en) * | 2018-04-27 | 2018-10-09 | 北京新能源汽车股份有限公司 | Vehicle and supply unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104135150B (en) | 2017-11-21 |
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