CN205051906U - A circuit and emitting diode lamps and lanterns for improving linear of emitting diode is adjusted - Google Patents
A circuit and emitting diode lamps and lanterns for improving linear of emitting diode is adjusted Download PDFInfo
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- CN205051906U CN205051906U CN201520272525.0U CN201520272525U CN205051906U CN 205051906 U CN205051906 U CN 205051906U CN 201520272525 U CN201520272525 U CN 201520272525U CN 205051906 U CN205051906 U CN 205051906U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to a circuit and emitting diode lamps and lanterns for improving the linear of emitting diode (LED) is adjusted, the circuit includes: the main coil is connected to the light emitting diode. First switch (Q1) for open and turn -off in order to carry out power converting in turn, first resistor (RCS) for detect the current signal of showing load current, wherein first resistor detects the current signal is used for optionally to turn -off first switch (Q1), input voltage detecting element for test input voltage is connected to first resistor (RCS) to be configured as to show during first switch conduction input voltage's current injection first resistor (RCS) so that first switch (Q1) turn -offs with higher speed. Through using according to this disclosed circuit, can obtain better linear adjusting function.
Description
Technical field
The disclosure relates to light fixture, more specifically, relates to the circuit of LED lamp and the linear regulation for improvement of light-emitting diode.
Background technology
For lighting, when different input voltages, light-emitting diode (LED) driver needs the output current providing relative constancy with the light output lumen of stable LED and power usually.Linear regulation defines the ratio of the change of LED current in nominal input voltage range.Namely, when input voltage fluctuates in sizable scope, LED current can not change too large.Here the fluctuation of indication, refer to the fluctuation (and not the sinusoid of civil power fluctuates) of the average/effective value such as inputting civil power, such as, due to the fluctuation of electric power system, common 220V voltage may reach 240V even 260V.
Conventional low-power factor self-excited oscillation pulse converter (LowPFRCC) cannot provide good linear regulation performance because of the poor Current draw ability of Zener diode.
Therefore, a kind of circuit of the linear regulation for improvement of light-emitting diode is newly needed.
Utility model content
In order to overcome at least some aspect in the problems referred to above, present disclosure proposes a kind of circuit and LED lamp of the linear regulation for improvement of light-emitting diode newly.
According to an aspect of the present disclosure, a kind of circuit of the linear regulation for improvement of light-emitting diode is provided, comprises: main coil, be connected to described light-emitting diode; First switch, carries out power transfer for alternately turning on and off; First resistor, for detecting the current signal representing load current, the described current signal that wherein said first resistor detects is for optionally turning off described first switch; Input voltage measurement unit, for detecting input voltage, is connected to described first resistor, and is configured to be accelerated to turn off to make described first switch by the first resistor described in the pulse current injectingt of the described input voltage of expression when described first switch conduction.
The advantage of this aspect is, reuse original for detecting the first resistor of load current, in this first resistor, inject the extracurrent representing input voltage information, thus this circuit is operated according to input voltage further, therefore provide linear regulating function at lower cost.
Alternatively, this circuit also comprises: auxiliary winding, with described main coil electromagnetic coupled; Described circuit also comprises being connected in series of the 3rd resistor and the first capacitor, described being connected in series is coupled in described auxiliary winding and described first switch provides On current for described first switch, and/or, described first switch and described first resistor in series are connected between described main coil and reference potential node, to detect the power current flowing through described first switch, and/or described input voltage measurement unit comprises: described auxiliary winding; Or carry the bus of described input voltage.
This aspect provides the circuit structure of self-excited oscillation pulse converter, cost is lower.Be appreciated that the circuit that the utility model also goes for other control modes and drives, such as IC controls.
Alternatively, described first switch and described first resistor in series are connected between described main coil and reference potential node, to detect the power current flowing through described first switch.
This aspect provides the circuit structure based on step-down (buck) transducer.Be appreciated that the utility model also goes for the transducer of other types, such as buck-boost (buck-boost), boosting (boost) etc.
Alternatively, described input voltage measurement unit comprises: described auxiliary winding; Or, carry the bus of described input voltage.
In one embodiment, owing to auxiliary winding can induce the voltage on main coil, and the voltage on main coil depends on input voltage, and therefore auxiliary winding can as the part of input voltage measurement unit.Alternately, the bus carrying described input voltage can as the part of input voltage measurement unit directly to obtain input voltage.
Alternatively, described input voltage measurement unit also comprises being connected in series of the first diode and the second capacitor, and being connected in series of described first diode and the second capacitor is in parallel with described auxiliary winding.
Due to the smothing filtering effect of the second capacitor, this execution mode can provide the signal of the input voltage of a more stable instruction fluctuation.
Alternatively, described input voltage measurement unit comprises the second resistor being series at described first resistor.
The effect of this second resistor comprises the current limliting provided to a certain degree.
Alternatively, also comprise the second diode, being connected in series that described second diode is formed with by described main coil and described light-emitting diode is in parallel, and wherein said main coil to be configured to during described first switch OFF by described second diode continuousing flow to power to described light-emitting diode.
This embodiment offers the structure of more concrete circuit for power conversion.
Alternatively, also comprise in parallel with described light-emitting diode and be configured to the filtering capacitor of filtering.
Filtering capacitor in this execution mode can reduce the ripple on light-emitting diode, avoids light-emitting flash.
Alternatively, also comprise the second switch between base stage and described reference potential node being connected on described first switch and the first Zener diode be connected between the collector electrode of described second switch and base stage, described second switch and described first Zener diode are arranged to and extract electric current to accelerate described first switch OFF when described first switch starts to turn off because the voltage on the first resistor increases from the base stage of described first switch.
On the basis that the first switch turns off voluntarily, this execution mode makes second switch take out stream according to input voltage from the base stage of the first switch, accelerates the first switch OFF, thus this embodiment offers further linear regulating function.
Alternatively, also comprise excess temperature compensating circuit, described excess temperature compensating circuit connects between described auxiliary winding and the base stage of described second switch, and be configured to increase the electric current being supplied to the base stage of described second switch when described circuit temperature raises, extract electric current with the base stage from described first switch, thus accelerate described first switch OFF.
The second switch being used for linear regulation is further used for overheat protector by this execution mode, provides cost savings.
Alternatively, described excess temperature compensating circuit is included in the 4th resistor, the 5th resistor and the 6th resistor that are connected in series between described auxiliary winding and described reference potential node and the second Zener diode being connected to described reference potential node and described 4th resistor, and wherein said 5th resistor is thermistor.
This embodiment offers the particular circuit configurations of overheat protector.
According to another aspect of the present disclosure, provide a kind of light fixture comprised according to the described circuit of above-mentioned item.
By using according to embodiment of the present disclosure, owing to having for accelerating input voltage detection circuit that bipolar transistor turns off and optional excess temperature compensating circuit, better linear regulation performance therefore can be obtained.
Accompanying drawing explanation
In conjunction with the drawings disclosure illustrative embodiments is described in more detail, above-mentioned and other object of the present disclosure, Characteristics and advantages will become more obvious, wherein, in disclosure illustrative embodiments, identical reference number represents same parts usually.
Fig. 1 is the illustrative circuitry according to an embodiment of the present disclosure; And
Fig. 2 is the illustrative circuitry according to another embodiment of the present disclosure.
Embodiment
Now set forth some detail in the following description to provide the thorough understanding of the various aspects to subject content of the present disclosure.But still can realize subject content of the present disclosure when not having these details.
Unless the context otherwise requires, otherwise specification and appended claims in full in, word " comprises " being construed to and openly comprises meaning, that is, is interpreted as " including but not limited to ".
Quote " embodiment " or " embodiment " in this specification and mean that special characteristic, structure or the characteristic described in conjunction with this embodiment is contained at least one embodiment.Therefore, occur that expressing " in one embodiment " or " in an embodiment " may not all refer to identical aspect in this specification everywhere.In addition, can present disclosure one or more in combine special characteristic, structure or characteristic in any appropriate manner.
The circuit for realizing good linear adjusting function according to an embodiment of the present disclosure is shown see Fig. 1, Fig. 1.Circuit in Fig. 1 can be made up of discrete parts.It will be understood by those skilled in the art that some parts of the circuit in Fig. 1 can integrate, or the circuit integrity of Fig. 1 is integrated.By strengthening peak value comparison method ability and positive feedback control method, the embodiment in Fig. 1 can keep the outputting current steadily of LED driver when input voltage changes, thus improves linear regulation performance.
The circuit of the linear regulation for improvement of light-emitting diode in Fig. 1 comprises: main coil; First switch; First resistor R
cSwith input voltage measurement unit, wherein main coil is connected to LED, and first switch of such as bipolar transistor and so on is used for alternate conduction and turns off to carry out power transfer, the first resistor R
cSsuch as be connected to main coil such as, for detecting the current signal relevant with load current, the load current flowing through main coil and the first switch when the first switch conduction as shown in Figure 1, and the first resistor R
cSon this current signal may be used for selectivity and turn off the first switch, will describe as following.In traditional LED drive circuit, the first resistor R
cSfor detecting load current.Comparatively speaking, according in embodiment of the present disclosure, the first resistor R
cSbe re-used, that is, except load current flows through the first resistor R
cSoutside, represent that the extracurrent of input voltage information is also injected into the first resistor, thus this circuit is operated according to input voltage further, therefore can improve higher linear regulating function with lower cost.
In the embodiment in figure 1, first switch is the first bipolar transistor Q1, but it will be appreciated by those skilled in the art that, this be only signal and unrestricted, first switch can use the switch element of other type for power transfer, such as MOS (metal-oxide-semiconductor) memory (MOSFET).In addition, those skilled in the art are further appreciated that and can also use relevant with load current or represent other signal of load current, and use this signal optionally to turn off the first switch.
In the embodiment in figure 1, auxiliary winding is coupled to main coil by electromagnetic induction, and input voltage measurement unit is connected to auxiliary winding for sensing input voltage, and input voltage measurement unit is connected to the first resistor R
cS, make when the first bipolar transistor Q1 conducting, the electric current of the expression input voltage responded to by auxiliary winding injects the first resistor R via the second resistor R5
cS.First resistor R
cSon voltage then raise, cause the base emitter voltage V of the first bipolar transistor Q1
bebe less than conducting voltage, such as 0.7V, thus accelerate the shutoff of the first bipolar transistor Q1.In the example of fig. 1, input voltage measurement unit can also comprise diode D2 and capacitor C2, they are for providing a more stable direct voltage at Vcc place, this direct voltage is relevant with input voltage, it is intended to example and unrestricted, it will be understood by those skilled in the art that input voltage measurement unit can have other to configure, such as shown in Fig. 2, it will specifically describe hereinafter.In addition, the electric current flowed in auxiliary winding, resistor R2, R5 also reflects the situation of the voltage of input, therefore, also may be used for the situation representing input voltage.Such as, owing to auxiliary winding can induce the voltage on main coil, and the voltage on main coil depends on input voltage, and therefore auxiliary winding can as the part of input voltage measurement unit.Alternately, the bus carrying described input voltage can as the part of input voltage measurement unit directly to obtain input voltage.
As shown in Figure 1, the first resistor R
cSbe connected between the emitter of the first bipolar transistor Q1 and reference potential node (such as, ground connection).It will be understood by those skilled in the art that first bipolar transistor Q1 optionally conducting or shutoff (cut-off) according to the voltage difference Vbe between its base stage and emitter.
The circuit of Fig. 1 also comprises being connected in series of the 3rd resistor R2 and the first capacitor C3, this is connected in series and is coupled between auxiliary winding and the first bipolar transistor Q1, with when the first transistor Q1 starts to open, for providing On current to the base stage of the first bipolar transistor Q1, open control with what realize positive feedback formula.
The circuit of Fig. 1 also comprises the second diode D1, and being connected in series that the second diode D1 is formed with by main coil and LED is in parallel, is powered by main coil for the blocking interval at the first bipolar diode Q1 to LED afterflow.
The circuit of Fig. 1 also comprises filtering capacitor C4 for filtering in parallel with LED, and filtering capacitor C4 can reduce ripple on LED to avoid light-emitting flash.
The circuit of Fig. 1 also comprises the second bipolar transistor Q2 between base stage and reference potential node (such as GND) being connected on the first bipolar transistor Q1 and the first Zener diode Z1 be connected between the collector electrode of the second bipolar transistor Q2 and base stage, second bipolar transistor Q2 and the first Zener diode Z1 is arranged to and extracts electric current to accelerate the shutoff of the first bipolar transistor Q1 when the first bipolar transistor Q1 starts to turn off from the first bipolar transistor Q1, thus provides further linear regulating function on the basis that the first switch turns off voluntarily.
Circuit for improvement of the linear regulation of light-emitting diode also comprises excess temperature compensating circuit alternatively, it connects between auxiliary winding and the base stage of the second bipolar transistor, and be configured to extract electric current when circuit temperature raises from the base stage of the first bipolar transistor Q1, thus accelerate the shutoff of the first bipolar transistor Q1.Such as; in the circuit in fig. 1; excess temperature compensating circuit is included in the 4th resistor R1 be connected in series, the 5th resistor R3 and the 6th resistor R4 between auxiliary winding and reference potential node (such as GND) and is connected to the second Zener diode Z2 of GND and the 4th resistor R1; wherein the 5th resistor R3 is thermistor; its resistance raises along with temperature and reduces; this configuration makes the second switch being used for linear regulation be further used for overheat protector, thus provides cost savings.It will be understood by those skilled in the art that excess temperature compensating circuit can also have other configuration, as long as it can extract electric current when temperature raises from the base stage of the first bipolar transistor, thus accelerate the shutoff of the first bipolar transistor.
Fig. 1 generally illustrates the circuit structure of self-excited oscillation pulse converter, and cost is lower.Be appreciated that the circuit that the utility model also goes for other control modes and drives, such as IC controls.Those skilled in the art it is also understood that, although the circuit in Fig. 1 is based on step-down controller, but of the present utility model such as based on the first resistor be re-used with acceleration switch turn off principle be not limited thereto, but also go for the transducer of other type, such as bust-boost converter, boost converter etc.
The operation principle of the circuit of Fig. 1 is described below.C1 provides the electric current of the smothing filtering after rectifier bridge (not shown).When circuit is started working, C1 provides electric current to the base stage of the first bipolar transistor Q1 by starting resistance Ron, makes the first bipolar transistor Q1 start conducting.Meanwhile, C1 also provides electric current to LED.Due to now, the first bipolar transistor Q1 conducting, electric current, through the main coil of LED, transformer T1 and the first bipolar transistor Q1, flows through the first resistor R then
cS.
In this stage, when electric current flows through main coil, auxiliary winding is coupled by electromagnetic induction and produces induced voltage, and now the Same Name of Ends of transformer T1 is just.3rd resistor R2 and the first capacitor C3 obtains voltage thus, and provides electric current to the base stage of the first bipolar transistor Q1, thus makes the first bipolar transistor Q1 keep conducting state.
Along with the first bipolar transistor Q1 constant conduction, voltage/current on main coil becomes large, the auxiliary winding of transformer T1 also provides larger base current to the base stage of the first bipolar transistor Q1 by the 3rd resistor R2 and the first capacitor C3, thus accelerate the conducting of the first bipolar transistor Q1, thus form the acceleration turn on process of positive feedback.
The rectifying and wave-filtering voltage of the representative input voltage that the input voltage measurement unit senses C1 comprising the first diode D2 and the second capacitor C2 provides, and the Injection Current I with rectifying and wave-filtering voltage in proportion is provided
injectto the second resistor R5.Second capacitor C2 can smoothing filtering, therefore can provide the more stable signal of the input voltage of instruction fluctuation.
In the present embodiment, the second resistor R5 can provide current limliting to a certain degree.Second resistor R5 receives two-way electric current thus, and wherein the first via is from the power current flowing through the first bipolar transistor Q1, and the second tunnel is from Injection Current I
inject.Along with flowing through the first resistor R
cSelectric current increase, the first resistor R
cSon voltage also increase thereupon.When this voltage to a certain extent time, improve the emitter voltage of the first bipolar transistor Q1, so the first bipolar transistor Q1 base emitter voltage difference Vbe be less than conducting voltage, such as 0.7V, thus the first bipolar transistor Q1 starts to turn off voluntarily.
And, the base voltage of the first bipolar transistor Q1 raises and causes the first Zener diode Z1 breakdown, the second bipolar transistor Q2 is made to start conducting, anti-phase extraction electric current is accelerated from the base stage of the first bipolar transistor Q1, and then make the first bipolar transistor Q1 move back saturated, until the first bipolar transistor Q1 turns off.Specifically, the Zener voltage V of the first Zener diode Z1 is reached at the base voltage of the first bipolar transistor Q1
z1with the base-emitter voltage V of the second bipolar transistor
beduring sum, first Zener diode Z1 extracts electric current from the first bipolar transistor Q1, and the second bipolar transistor amplifies this electric current, namely, the collector electrode of transistor seconds Q2 also extracts electric current from the base stage of the first bipolar transistor Q1, this makes the first bipolar transistor Q1 acceleration move back saturated, until the first bipolar transistor Q1 turns off.
After first bipolar transistor Q1 turns off, main coil is powered to LED afterflow, and the voltage reversal of main coil, now, the Same Name of Ends of the main coil of transformer T1 transfers to negative.The Same Name of Ends of the auxiliary winding of T1 also correspondingly becomes negative, and auxiliary winding carries out afterflow by the 3rd resistor R2, the first capacitor C3, the first Zener diode Z1 and the 6th resistor R4.
During circuit working, ambient temperature can promote because of the heating of electronic device.Circuit devcie may cause hydraulic performance decline because of the increase of temperature, even causes irreversible device failure.Thermal-shutdown circuit in the circuit in fig. 1 can be protected this.As shown in Figure 1,4th resistor R1, the 5th resistor R3 and the 6th resistor R4 form bleeder circuit between auxiliary winding and reference potential (such as GND), and the second Zener diode Z2 provides fixed voltage for the 5th resistor R3 and the 6th resistor R4, wherein the 5th resistor R3 is thermistor, and its resistance value reduces along with the increase of temperature.When ambient temperature increases, the resistance of the 5th resistor R3 reduces, the electric current flowing through the 5th resistor R3 is increased, base stage due to the second bipolar transistor Q2 is connected between the 5th resistor R3 and the 6th resistor R4, therefore the base voltage of the second bipolar transistor Q2 increases thereupon, thus the electric current flowing through the first Zener diode Z1 is amplified, this makes the electric current extracted from the base stage of the first bipolar transistor Q1 increase, thus the first bipolar transistor Q1 accelerates to turn off.
At the blocking interval of the first bipolar transistor Q1, the body capacitance of main coil and the first bipolar transistor Q1 forms oscillating circuit, thus the freewheel current flowing through main coil forms vibration in oscillating circuit, then make the voltage of main coil again reverse, Same Name of Ends is just becoming again.The Same Name of Ends of auxiliary winding is corresponding just to be transferred to, then provides base current by the 3rd resistor R2 and the first capacitor C3 to the base stage of the first bipolar transistor Q1, impels the first bipolar transistor Q1 conducting.
At the duration of work of this circuit, said process repeats.Due to according in embodiment of the present disclosure, the circuit for improvement of the linear regulation of light-emitting diode (LED) has circuit (the first resistor R of the emitter voltage for the first bipolar transistor being used for changing by the pulse current injectingt with the current in proportion representing input voltage
cS) input voltage measurement unit, therefore, when input voltage change (such as increase), correspondingly change the turn-on and turn-off of the first bipolar transistor Q1, such as, accelerate the shutoff of the first bipolar transistor Q1.Which achieve better linear regulation performance.
In addition, circuit according to the linear regulation for improvement of light-emitting diode (LED) of the present disclosure also preferably has excess temperature compensating circuit, this circuit can accelerate the shutoff of the first bipolar transistor Q1 further, thus obtains better linear regulation performance.
Show according to another embodiment of the present disclosure see Fig. 2, Fig. 2.The difference of the embodiment of Fig. 2 and the embodiment of Fig. 1 is input voltage detection circuit, input voltage detection circuit in Fig. 1 is in parallel with auxiliary winding and comprise the first diode D2 and the second capacitor C2, and the input voltage detection circuit in Fig. 2 only comprises the first diode D2, it is connected between C1 and the second resistor R5, and the first diode D2 is for detecting the input voltage being applied to LED.Similarly, along with the increase of input voltage, be injected into the first resistor R by the second resistor R5
cSelectric current I
injectalso correspondingly increase, thus with above for Fig. 1 embodiment described in accelerate the shutoff of the first bipolar transistor Q1 similarly.Because linear regulation does not need to use auxiliary winding, therefore this execution mode also can transform as and not use auxiliary winding, and uses IC to control the power converter type of the first switch Q1.
The working method of other parts of the circuit in Fig. 2 is similar to the mode that the embodiment above for Fig. 1 is discussed, and does not repeat them here.
It will be appreciated by those skilled in the art that, the resistor above used, capacitor and coil etc., only for illustrating explanation, and not intended to be limiting, those skilled in the art can use the resistance element or unit, capacitive element or unit and inductive element or unit with similar effects.In addition, the circuit element with similar voltage regulation result or unit also can be used to replace Zener diode.
According to another aspect of the present disclosure, provide a kind of LED lamp, it has the circuit according to the linear regulation for improvement of light-emitting diode (LED) limited in claims of the present disclosure.
Although it should be noted that the some unit or subelement that are referred to system in above-detailed, this division is only not enforceable.In fact, according to the embodiment of the present invention, the Characteristic and function of two or more unit above-described can be specialized in a unit.Otherwise, the Characteristic and function of an above-described unit can Further Division for be specialized by multiple unit.
Although describe the disclosure with reference to some embodiments, should be appreciated that, the disclosure is not limited to disclosed embodiment.The disclosure is intended to contain the interior included various amendment of spirit and scope and the equivalent arrangements of claims.The scope of claims meets the most wide in range explanation, thus comprises all such amendments and equivalent structure and function.
Claims (10)
1. for improvement of a circuit for the linear regulation of light-emitting diode, it is characterized in that, comprising:
Main coil, is connected to described light-emitting diode;
First switch, carries out power transfer for alternately turning on and off;
First resistor, for detecting the current signal representing load current, the described current signal that wherein said first resistor detects is for optionally turning off described first switch;
Input voltage measurement unit, for detecting input voltage, is connected to described first resistor, and is configured to be accelerated to turn off to make described first switch by the first resistor described in the pulse current injectingt of the described input voltage of expression when described first switch conduction.
2. circuit according to claim 1, is characterized in that, also comprises:
Auxiliary winding, with described main coil electromagnetic coupled;
Described circuit also comprises being connected in series of the 3rd resistor and the first capacitor, described in be connected in series and be coupled in described auxiliary winding and described first switch provides On current for described first switch, and/or,
Described first switch and described first resistor in series are connected between described main coil and reference potential node, to detect the power current flowing through described first switch, and/or
Described input voltage measurement unit comprises:
-described auxiliary winding; Or
-carry the bus of described input voltage.
3. circuit according to claim 2, is characterized in that, described input voltage measurement unit also comprises being connected in series of the first diode and the second capacitor, and being connected in series of described first diode and the second capacitor is in parallel with described auxiliary winding.
4. circuit according to claim 1, is characterized in that, described input voltage measurement unit comprises the second resistor being series at described first resistor.
5. circuit according to claim 2, it is characterized in that, also comprise the second diode, being connected in series that described second diode is formed with by described main coil and described light-emitting diode is in parallel, and wherein said main coil to be configured to during described first switch OFF by described second diode continuousing flow to power to described light-emitting diode.
6. circuit according to claim 1, is characterized in that, also comprises in parallel with described light-emitting diode and is configured to the filtering capacitor of filtering.
7. the circuit according to any one of claim 2-3 and 5, it is characterized in that, also comprise the second switch between base stage and described reference potential node being connected on described first switch and the first Zener diode be connected between the collector electrode of described second switch and base stage, described second switch and described first Zener diode are arranged to and extract electric current to accelerate described first switch OFF when described first switch starts to turn off because the voltage on the first resistor increases from the base stage of described first switch.
8. circuit according to claim 7, it is characterized in that, also comprise excess temperature compensating circuit, described excess temperature compensating circuit is connected between the base stage of described auxiliary winding and described second switch, and be configured to increase the electric current being supplied to the base stage of described second switch when described circuit temperature raises, extract electric current with the base stage from described first switch, thus accelerate described first switch OFF.
9. circuit according to claim 8, it is characterized in that, described excess temperature compensating circuit is included in the 4th resistor, the 5th resistor and the 6th resistor that are connected in series between described auxiliary winding and described reference potential node and the second Zener diode being connected to described reference potential node and described 4th resistor, and wherein said 5th resistor is thermistor.
10. a LED lamp, is characterized in that, comprises the circuit according to any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520272525.0U CN205051906U (en) | 2015-04-29 | 2015-04-29 | A circuit and emitting diode lamps and lanterns for improving linear of emitting diode is adjusted |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520272525.0U CN205051906U (en) | 2015-04-29 | 2015-04-29 | A circuit and emitting diode lamps and lanterns for improving linear of emitting diode is adjusted |
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| CN205051906U true CN205051906U (en) | 2016-02-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222955A (en) * | 2016-03-21 | 2017-09-29 | 法雷奥照明公司 | The management of binary message in luminous motor vehicles module including semiconductor component light source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222955A (en) * | 2016-03-21 | 2017-09-29 | 法雷奥照明公司 | The management of binary message in luminous motor vehicles module including semiconductor component light source |
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Granted publication date: 20160224 |