CN204408691U - A kind of LED power charge/discharge control circuit - Google Patents
A kind of LED power charge/discharge control circuit Download PDFInfo
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- CN204408691U CN204408691U CN201520063654.9U CN201520063654U CN204408691U CN 204408691 U CN204408691 U CN 204408691U CN 201520063654 U CN201520063654 U CN 201520063654U CN 204408691 U CN204408691 U CN 204408691U
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Abstract
A kind of LED power charge/discharge control circuit, comprises a LED switch power supply, a charge/discharge control circuit, a rectifying device, and a filter.Described rectifying device is used for the output current of described LED switch power supply to be converted to direct current.Described charge/discharge control circuit comprises a switch control unit, a switch element, and a discharge resistance.Described switch element comprises at least one switching tube.LED power charge/discharge control circuit provided by the utility model described switch element when when described LED switch electric power starting stops described discharge resistance to discharge.And described switch element opens the electric discharge of described discharge resistance when described LED switch power supply disconnects, and then this discharge resistance as dummy load is closed and the just conducting electric discharge when described LED load does not work when described LED load works, thus reduce complete machine consumption, improve overall efficiency, reduce the temperature of power source internal.
Description
Technical field
The utility model relates to a kind of lighting apparatus, particularly a kind of LED power charge/discharge control circuit.
Background technology
In general daily life, all can see various lighting apparatus everywhere, such as, fluorescent lamp, street lamp, desk lamp, artistic lamp etc.In above-mentioned lighting apparatus, major part is as illuminating source with osram lamp traditionally.In recent years, because science and technology is maked rapid progress, utilized light-emitting diode (LED) as light sources.Notably, except lighting apparatus, for general traffic sign, billboard, car light etc., also all change into and use light-emitting diode as illuminating source.As previously mentioned, use light-emitting diode as illuminating source, its benefit is power saving, and brightness is larger, therefore generalization gradually in use.
Along with popularizing of LED lamp, the stability of LED lamp also more and more causes the concern of people.The output of general LED power is all connected to dummy load, and the Main Function of dummy load is that the electrolysis filter of output existing a large amount of electric charges can be discharged by this dummy load after LED power input electricity is closed.This dummy load is simultaneously also helpful to providing the stability of system.But the dummy load in existing LED power directly connects one or several resistance to discharge, but no matter be that LED normally works or quits work, particularly when LED normally works, in existing power supply, dummy load is still at operating discharge.This causes the power consumption under normal boot-strap, and this not only reduces the overall efficiency of LED power, has also raised the temperature of LED power inside.
Utility model content
In view of this, be necessary the LED power charge/discharge control circuit providing a kind of stability higher, to overcome above-mentioned deficiency.
A kind of LED power charge/discharge control circuit, comprise one for providing the LED switch power supply of power supply, a charge/discharge control circuit being connected in parallel on described LED switch power output end, a rectifying device being connected on one end of described charge/discharge control circuit, and a filter being connected in parallel on described charge/discharge control circuit output and rectification circuit output end.Described rectifying device is used for the output current of described LED switch power supply to be converted to direct current.Described charge/discharge control circuit comprises a switch control unit, a switch element of connecting with described switch control unit, and a discharge resistance controlled by described switch element.Described switch element comprises at least one switching tube.When described LED switch electric power starting, described switch control unit disconnects described switch element and discharges to stop described discharge resistance.When described LED switch power supply disconnects, while described rectifying device stops the output voltage of described filter to be loaded on described switch control unit, the output voltage of described filter makes switch element described in described switch control unit conducting to open the electric discharge of described discharge resistance.
Compared with prior art, LED power charge/discharge control circuit provided by the utility model is when when described LED switch electric power starting, and described switch control unit disconnects described switch element and discharges to stop described discharge resistance.And when described LED switch power supply disconnects, the output voltage of described rectifying device makes switch element described in described switch control unit conducting to open the electric discharge of described discharge resistance, and then this discharge resistance as dummy load is closed and the just conducting electric discharge when described LED load does not work when described LED load works, thus reduce complete machine consumption, improve overall efficiency, reduce the temperature of power source internal.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiment of the present utility model is described, wherein.
The circuit theory diagrams of a kind of LED power charge/discharge control circuit that Fig. 1 provides for the utility model.
Fig. 2 is the circuit diagram of the LED power charge/discharge control circuit of Fig. 1.
Embodiment
Based on accompanying drawing, specific embodiment of the utility model is further elaborated below.Should be appreciated that specific embodiment described herein is only as embodiment, and be not used in restriction protection range of the present utility model.
Refer to Fig. 1, the circuit theory diagrams of its a kind of LED power charge/discharge control circuit 100 provided for the utility model.Described LED power charge/discharge control circuit 100 comprises one for providing the LED switch power supply 10 of power supply, a charge/discharge control circuit 11 being connected in parallel on described LED switch power supply 10 output, a rectifying device 12 being connected on the high level end of described charge/discharge control circuit 11, one is connected in parallel on the output of described charge/discharge control circuit 11 and the filter 13 of rectifying device 12 output, and a LED load 14 being connected in parallel on described filter 13 output.
The electric current that described LED switch power supply 10 uses for civil power being converted to applicable described LED load 14, as frequency, amplitude, the parameters such as size.Some control modules can also be comprised in described LED switch power supply 10 simultaneously, as light adjusting circuit, colour switching circuit etc.The output current of described LED switch power supply 10 is alternating current.
Described rectifying device 12, as shown in Figure 2, be a kind of rectification circuit, it utilizes the unidirectional general character of diode to carry out the circuit of rectification, to change alternating current into direct current.This rectification circuit utilizes two diodes in parallel to connect in the same way.When the positive half timesharing of input sine wave, described two diode current flows, thus export half positive sine wave.When the negative half portion timesharing of input sine wave, described two diodes cut-off, thus reach object alternating current being converted to direct current.Certainly, described rectifying device 12 can also use other circuit, but this rectifying device 12 generally all includes diode is used as one-way conduction element.
Described filter 13 is used for the impact of filtering clutter and antisurge, it comprises an electrochemical capacitor C5, to carry out filtering, to meet the electricity consumption requirement of described LED load 14 to the current/voltage exported from described rectifying device 12, it is one of the prior art, no longer describes in detail this.When described LED switch power supply 10 is opened, filtering is carried out in the output of described filter 13 to described rectifying device 12, thus makes the output of described filter 13 be applicable to the electric current of described LED load 14 use.In the present embodiment, described electrochemical capacitor C5 will charge when described LED switch power supply 10 is opened or partial discharge with ensure described filter 13 output current close rule.When described LED switch power supply 10 is closed, described filter 13 owing to being also filled with electric charge, if if this electric charge does not bleed off at once, LED load can be allowed slowly just to turn off, affect its using character.So need to allow described filter 13 discharge at once.
Described charge/discharge control circuit 11 is for bleeding off stored charge in described filter 13 when described LED switch power supply 10 is closed.Described charge/discharge control circuit 11 comprises a switch control unit 111, switch element 112 of connecting with described switch control unit 111, and a discharge resistance 113 controlled by described switch element 112.The input of described switch control unit 111 and the output of described LED switch power supply 10 are electrically connected.Described switch control unit 111 and switch element 112 are electrically connected to control this switch element 112 conducting or closedown and then control the break-make of described discharge resistance 113.Therefore described switch element 112 is electrically connected with described discharge resistance 113.
Described switch control unit 111 comprises flow-restriction 1111, the rectification unit 1112 of connecting with described flow-restriction 1111 be electrically connected with described LED switch electric current 10, and a filter unit 1113 of connecting with described rectification unit 1112.Described flow-restriction 1111 only can comprise a resistance, or only comprise an electric capacity, the electric capacity of a resistance and one and this resistant series can also be comprised, with the larger current of the output to LED switch power supply 10 limit and then export suitable described switch element 112 use electric current, because if electric current too conference burn described switch element 112.In the present embodiment, described flow-restriction 1111 comprises a resistance R100 and the electric capacity C100 connected with this resistance R100.According to the specification of described switch element 112, the restriction of the output current to described LED switch power supply 10 can be completed by the parameter arranging described resistance R100 and electric capacity C100, thus reach the electric current of applicable described switch element 112.
Described rectification unit 1112 comprises a voltage-stabiliser tube D100 and and the diode D101 of Opposite direction connection in parallel with this voltage-stabiliser tube D100.In the present embodiment, anode and the flow-restriction 1111 of described diode D101 are electrically connected, and negative electrode and the filter unit 1113 of described diode D101 are electrically connected.Negative electrode and the flow-restriction 1111 of described voltage-stabiliser tube D100 are electrically connected, and its anode and filter unit 1113 are electrically connected.The alternating current that described flow-restriction 1111 exports can be converted to direct current by described rectification unit 1112.
Described filter unit 1113 comprises an an electric capacity C101 and resistance R101 in parallel with this electric capacity C101.Described filter unit 1113, for the impact of filtering clutter and antisurge, burns out described switch element 112 to avoid peak current.
Described switch element 112 comprises at least one switching tube.Described switching tube can be metal-oxide-semiconductor, also can be triode.Because described switch element 112 comprises at least one switching tube, and in order to increase the multiplication factor of described switch element 112, described switch element 112 can be a Darlington transistor, also can be a compound transistor.When described switch element 112 is Darlington transistor, the base stage of described Darlington triode is connected with the output electric property of filter unit 1113, and emitter is connected with the output electric property of rectifying device 12, and collector electrode and discharge resistance 113 are electrically connected.In the present embodiment, described switch element 112 is a compound transistor, and it comprises two PNP type triode Q100, Q101.The base stage of described compound transistor is connected with the output electric property of filter unit 1113, and emitter is connected with the output electric property of rectifying device 12, and collector electrode and discharge resistance 113 are electrically connected.
Described discharge resistance 113 is a resistance R102, and the parameter of its resistance as required as filter 13 is arranged.This discharge resistance 113 as a dummy load, when described LED switch power supply 10 disconnects, for bleeding off the described filter 13 i.e. electricity of electrochemical capacitor C5 with prestissimo.One end and the switch element 112 of this discharge resistance 113 are electrically connected, other end ground connection.
Described LED load 14 can be one or more LED, and it can be parallel connection also can be series connection, does not repeat them here.
Operationally, when described LED switch power supply 10 is opened, its two ends export high level, and convert direct current to through rectifying device 12 rectification, then through filter 13 i.e. electrochemical capacitor C5 filtering, finally export to LED load 14, this LED load 14 is started working.During this period, i.e. described LED switch power supply 10 open period, because its two ends export high level, the flow-restriction 1111 of described switch control unit 111 receives a high level voltage, after described rectification unit 1112 and filter unit 1113, be supplied to described switch element 112 1 high level voltages, and described switch element 112 is a switching tube, under the effect of this high level voltage, be in cut-off state, thus disconnect described switch element 112 and discharge to stop described discharge resistance 113.And when described LED switch power supply 10 is closed, its two ends export as low level voltage, filter 13 i.e. electrochemical capacitor C5 starts electric discharge simultaneously, but due to the one-way conduction function of the diode in described rectifying device 12, the discharge charge of described filter 13 is made to be difficult to arrive the input of described switch control unit 111, therefore the output of described switch control unit 111 is low level, thus make to use the switch element 112 of switching tube to be in conducting state, and then open described discharge resistance 113 and discharge.
Compared with prior art, LED power charge/discharge control circuit 100 provided by the utility model is when opening when described LED switch power supply 10, and described switch control unit 111 disconnects described switch element 112 and discharges to stop described discharge resistance 113.And when described LED switch power supply 10 disconnects, the output voltage of described rectifying device 13 makes switch element 112 described in the conducting of described switch control unit 111 discharge to open described discharge resistance 113, and then this discharge resistance 113 as dummy load is closed and the just conducting electric discharge when described LED load 14 does not work when described LED load 14 works, thus reduce complete machine consumption, improve overall efficiency, reduce the temperature of power source internal.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do in spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (10)
1. a LED power charge/discharge control circuit, it is characterized in that: described LED power charge/discharge control circuit comprises one for providing the LED switch power supply of power supply, a charge/discharge control circuit being connected in parallel on described LED switch power output end, a rectifying device being connected on one end of described charge/discharge control circuit, and a filter being connected in parallel on described charge/discharge control circuit output and rectification circuit output end, described rectifying device is used for the output current of described LED switch power supply to be converted to direct current, described charge/discharge control circuit comprises a switch control unit, a switch element of connecting with described switch control unit, and a discharge resistance controlled by described switch element, described switch element comprises at least one switching tube, when described LED switch electric power starting, described switch control unit disconnects described switch element and discharges to stop described discharge resistance, when described LED switch power supply disconnects, while described rectifying device stops the output voltage of described filter to be loaded on described switch control unit, the output voltage of described filter makes switch element described in described switch control unit conducting to open the electric discharge of described discharge resistance.
2. LED power charge/discharge control circuit as claimed in claim 1, is characterized in that: the output current of described LED switch power supply is alternating current.
3. LED power charge/discharge control circuit as claimed in claim 1, is characterized in that: described rectifying device comprises at least one diode.
4. LED power charge/discharge control circuit as claimed in claim 1, is characterized in that: described filter comprises an electrochemical capacitor and carries out filtering with the direct current of the output to LED switch power supply.
5. LED power charge/discharge control circuit as claimed in claim 1, it is characterized in that: described switch control unit comprises the flow-restriction that an one end and LED switch power supply are electrically connected, a rectification unit of connecting with described flow-restriction, a filter unit of connecting with described rectification unit, described flow-restriction is with thinking that at least one switching tube described provides suitable current, described rectification unit is in order to be converted to direct current to the output current of flow-restriction, and described filter unit is used for carrying out filtering to the output current of described flow-restriction.
6. LED power charge/discharge control circuit as claimed in claim 5, is characterized in that: described flow-restriction comprises a current-limiting resistance, or an electric capacity, or the tandem compound of a current-limiting resistance and electric capacity.
7. LED power charge/discharge control circuit as claimed in claim 5, it is characterized in that: described rectification unit comprises a diode and a voltage stabilizing didoe of electric connection in parallel, described diode is contrary with the direction of voltage stabilizing didoe, the anode of described diode and flow-restriction are electrically connected, and the negative electrode of described diode and filter unit are electrically connected.
8. LED power charge/discharge control circuit as claimed in claim 5, is characterized in that: described filter unit comprises an electric capacity and the resistance arranged with this Capacitance parallel connection.
9. LED power charge/discharge control circuit as claimed in claim 1, it is characterized in that: described switching tube is a Darlington triode, the base stage of described Darlington triode is connected with the output electric property of filter unit, emitter is connected with the output electric property of rectifying device, and collector electrode and discharge resistance are electrically connected.
10. LED power charge/discharge control circuit as claimed in claim 1, it is characterized in that: described switch element is the multiplication factor that a compound transistor be at least made up of two triodes exports to improve described switch element, the base stage of described compound transistor is connected with the output electric property of filter unit, emitter is connected with the output electric property of rectifying device, and collector electrode and discharge resistance are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520063654.9U CN204408691U (en) | 2015-01-29 | 2015-01-29 | A kind of LED power charge/discharge control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520063654.9U CN204408691U (en) | 2015-01-29 | 2015-01-29 | A kind of LED power charge/discharge control circuit |
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| CN204408691U true CN204408691U (en) | 2015-06-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105992426A (en) * | 2015-01-29 | 2016-10-05 | 赛尔富电子有限公司 | LED power supply discharge control circuit |
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- 2015-01-29 CN CN201520063654.9U patent/CN204408691U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105992426A (en) * | 2015-01-29 | 2016-10-05 | 赛尔富电子有限公司 | LED power supply discharge control circuit |
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