CN206118126U - Novel linear constant -current drive circuit - Google Patents
Novel linear constant -current drive circuit Download PDFInfo
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- CN206118126U CN206118126U CN201621166344.0U CN201621166344U CN206118126U CN 206118126 U CN206118126 U CN 206118126U CN 201621166344 U CN201621166344 U CN 201621166344U CN 206118126 U CN206118126 U CN 206118126U
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Abstract
The utility model provides a novel linear constant -current drive circuit, by mains power supply, the first end of LED cluster is connected to an output of rectifier bridge, the second end is connected via first switch sub circuit and energy -storage capacitor's one end, and energy -storage capacitor's the other end is connected to another output of rectifier bridge, the one end of second switch sub circuit is connected to first switch sub circuit and energy -storage capacitor's junction, and the other end is connected to the end of taking a percentage of LED cluster, the one end of third switch sub circuit is connected to the second end of LED cluster, and the other end is connected to rectifier bridge and energy -storage capacitor's junction. Its advantage lies in under fixed mains power supply voltage, can allow the LED voltage of broad scope for illumination design person is more nimble to LED's selection.
Description
Technical field
This utility model is related to LED drive circuit, and in particular to a kind of novel linear constant-current drive circuit, more particularly to
The linear constant current drive scheme that integrated circuit can be used to realize.
Background technology
Based on traditional high frequency switch power, the program uses high-frequency switch circuit, circuit to current LED drive schemes
Complexity, high cost so that the linear constant current drive scheme that numerous manufacturers begin one's study simple, reliable and cheap.
Fig. 1 is a kind of linear constant current drive circuit for using at present, comprising a civil power VAC1, a rectifier bridge DB1, a LED
String LED1, a current source CC1.
The input of rectifier bridge DB1 is connected with civil power VAC1, and output head anode is connected with the anode of LED1, minus earth,
The negative electrode Jing current sources CC1 of LED1 is connected with the negative pole of rectifier bridge.
In the program, commercial power rectification voltage magnitude is wholly converted into heat more than the part of LED1 pressure drops, consumes in constant current
On the CC1 of source.
The voltage at constant-current source CC1 two ends overcomes the surplus value after LED1 pressure drops, the part to remain for the commutating voltage of rectifier bridge
Residual value is bigger, then the caloric value of constant-current source CC1 is bigger, and the efficiency of circuit is lower, is to improve efficiency, reduces caloric value, need to make
The pressure drop of LED is obtained as close as commutating voltage, but so, when line voltage is reduced, the electric current flow through on LED1
The obvious decline of meeting again, therefore in practical application, it is necessary to compromise selection is made between efficiency and input voltage range.When
Before, the more commonly used is configured to：Under 220vac input voltages, the total voltage of LED1 is designed as 230-260V；For 120vac
Under input voltage, the total voltage of LED1 is designed as 120-135V, and different power, different products are not always the case, and this gives LED
The conceptual design of illuminating product and cost control bring great difficulty.
Accordingly, it would be desirable to a kind of linear constant current circuit structure, in fixed mains-supplied, can allow the LED of relative broad range
Voltage so that selection of the luminaire designers to LED is more flexible.
Utility model content
For the technological deficiency that above-mentioned prior art is present, this utility model provides a kind of novel linear constant-current driving electricity
Road and the linear constant current drive circuit realized using integrated circuit.
This utility model provides a kind of novel linear constant-current drive circuit, by mains-supplied, including：Rectifier bridge, LED strip,
Storage capacitor, first switch electronic circuit, second switch electronic circuit and the 3rd switch electronic circuit；The input connection civil power of rectifier bridge,
Comprising two outfans；LED strip is by several LED strip joint groups into first end, the second end and tap terminals, tap terminals are LED
Arbitrary series connection node or first end of string；The first end of LED strip is connected to an outfan of rectifier bridge, the second end via first
One end connection of switch electronic circuit and storage capacitor, the other end of storage capacitor are connected to another outfan of rectifier bridge, structure
Into energy absorption branch road；One end of second switch electronic circuit is connected to the joint of first switch electronic circuit and storage capacitor, separately
One end is connected to the tap terminals of LED strip；One end of 3rd switch electronic circuit is connected to the second end of LED strip, and the other end is connected to
The joint of rectifier bridge and storage capacitor；Between storage capacitor, second switch electronic circuit, the tap terminals of LED strip and the second end
The switch electronic circuits of LED and the 3rd constitute energy and release branch road；Two outfans of rectifier bridge, LED strip and the 3rd switch electronic circuit
Constitute the straight-through branch roads of LED.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：When the output of rectifier bridge
Voltage magnitude more than the voltage of LED strip and during storage capacitor both end voltage sum, first switch electronic circuit and energy absorption branch road
Conducting；Second switch electronic circuit, the 3rd switch electronic circuit, energy are released branch road and the straight-through branch road cut-offs of LED；It is defeated when rectifier bridge
Go out voltage of the voltage magnitude more than LED strip, but when the voltage less than LED strip and storage capacitor both end voltage sum, the 3rd switch
Electronic circuit and the straight-through branch road conductings of LED, first switch electronic circuit, second switch electronic circuit, energy absorption branch road and energy are released
Branch road is turned off；When the output voltage amplitude of rectifier bridge is less than the voltage of LED strip, first switch electronic circuit, energy absorption
The straight-through branch road cut-off of road and LED, second switch electronic circuit, the 3rd switch electronic circuit and energy are released branch road conducting.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：3rd switch electronic circuit
For a controlled current source, controlled current source is in cut-off state when energy absorption branch road is turned on, otherwise in the conduction state, leads
There is during logical state current-limiting function.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：In energy absorption branch road
On any position connect into a current source, current source bears forward voltage when energy absorption branch road is turned on, with current limliting work(
Energy.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：The cut-off current of current source
More than the cut-off current of controlled current source.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：First switch electronic circuit
And/or second switch electronic circuit is a diode.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：Also include first resistor,
Second resistance, 3rd resistor, the first integrated circuit；First switch electronic circuit is the first diode, and second switch electronic circuit is the
Two diodes, the 3rd switch electronic circuit is the second integrated circuit；The input connection civil power of rectifier bridge, output first end for just, the
Two ends are grounded；First integrated circuit and the second integrated circuit are respectively provided with three feet, and the first foot is current input terminal, and crus secunda is core
Piece ground, the 3rd foot are current detecting end；First integrated circuit includes the first voltage-controlled current source and the first signal criterion, and first is voltage-controlled
Current source includes two power ends and two control ends, and it is integrated that two power ends of the first voltage-controlled current source are connected respectively to first
The first foot of circuit and the 3rd foot, a control end of the first voltage-controlled current source are connected with the positive pole of the first signal criterion, another
Control end is connected to the 3rd foot of the first integrated circuit, and the negative pole of the first signal criterion is connected to the second of the first integrated circuit
Foot；Second integrated circuit includes the second voltage-controlled current source and secondary signal benchmark, and the second voltage-controlled current source includes two power ends
With two control ends, two power ends of the second voltage-controlled current source are connected respectively to second the first foot of integrated circuit and the 3rd foot,
One control end of the second voltage-controlled current source is connected with the positive pole of secondary signal benchmark, and it is integrated that another control end is connected to second
3rd foot of circuit, the negative pole of secondary signal benchmark are connected to the crus secunda of the second integrated circuit；The first end of LED strip is connected to
The anode of the first end of rectifier bridge output, second the first diode of termination, the negative electrode of the first diode and one end of storage capacitor
Connection, the other end of storage capacitor are connected to the first foot of the first integrated circuit via first resistor, and the of the first integrated circuit
Three feet are grounded via second resistance；The crus secunda ground connection of the first integrated circuit；The anode of the second diode is connected to the one or two pole
The joint of pipe and storage capacitor, negative electrode are connected to the tap terminals of LED strip；Second the first foot of integrated circuit is connected to LED strip
Second end, crus secunda are connected to the first foot of the first integrated circuit, the 3rd foot and are connected to storage capacitor and via 3rd resistor
The intersection of one resistance.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：Also include the 4th resistance,
5th resistance and the 3rd integrated circuit；First switch electronic circuit is the first diode, and second switch electronic circuit is the second diode；
3rd switch electronic circuit is the 4th integrated circuit；The input connection civil power of rectifier bridge, output first end is for just, the second end is grounded；
3rd integrated circuit and the 4th integrated circuit are respectively provided with three feet, and the first foot is current input terminal, and crus secunda is chip ground, and the 3rd
Foot is current detecting end；3rd integrated circuit includes the 3rd voltage-controlled current source and the 3rd signal criterion, the 3rd voltage-controlled current source bag
Containing two power ends and two control ends, two power ends of the 3rd voltage-controlled current source are connected respectively to the of the 3rd integrated circuit
One foot and the 3rd foot, a control end of the 3rd voltage-controlled current source are connected with the positive pole of the 3rd signal criterion, another control end
The 3rd foot of the 3rd integrated circuit is connected to, the negative pole of the 3rd signal criterion is connected to the crus secunda of the 3rd integrated circuit；4th
Integrated circuit includes the 4th voltage-controlled current source and the 4th signal criterion, and the 4th voltage-controlled current source includes two power ends and two controls
End processed, two power ends of the 4th voltage-controlled current source are connected respectively to first foot and the 3rd foot of the 4th integrated circuit, the 4th pressure
One control end of control current source is connected with the positive pole of the 4th signal criterion, and another is connected to the 3rd of the 4th integrated circuit
Foot, the negative pole of the 4th signal criterion are connected to the crus secunda of the 4th integrated circuit；The first end of LED strip is connected to rectifier bridge output
First end, the anode of second the first diode of termination, the negative electrode of the first diode is connected with one end of storage capacitor, and energy storage is electric
The other end of appearance is connected to the first foot of the 3rd integrated circuit, and the 3rd foot of the 3rd integrated circuit is via the 4th resistance eutral grounding；The
Four the first feet of integrated circuit are connected to the second end of LED strip, the 3rd foot and the of the 3rd integrated circuit are connected to via the 5th resistance
Three feet；The crus secunda of the 3rd integrated circuit and the 4th integrated circuit is grounded；The anode of the second diode is connected to the one or two pole
The joint of pipe and storage capacitor, negative electrode are connected to the tap terminals of LED strip.
This utility model provides a kind of novel linear constant-current drive circuit, also with following characteristics：Also it is connected in parallel on including one
Rectifier bridge exports the switched current source at two ends, switched current source any one in the straight-through branch road of energy absorption branch road and LED
End when conducting, on the contrary conducting.
The linear perseverance that this utility model is provided a kind of novel linear constant-current drive circuit and realized using integrated circuit
Drive circuit is flowed, its advantage is：Under fixed mains-supplied voltage, the LED voltage of relative broad range can be allowed so that shine
Selection of the bright designer to LED is more flexible.
Description of the drawings
Fig. 1 is a kind of linear constant current drive circuit for using at present.
Fig. 2 is the schematic diagram of novel linear constant-current drive circuit of the present utility model.
Fig. 3 is the novel linear constant-current drive circuit figure of embodiment one.
Fig. 4 is the novel linear constant-current drive circuit figure of embodiment two.
Specific embodiment
This utility model is further described with specific embodiment below in conjunction with the accompanying drawings.
Fig. 2 is the schematic diagram of novel linear constant-current drive circuit of the present utility model.
As shown in Fig. 2 novel linear constant-current drive circuit includes：Civil power AC2, rectifier bridge DB2, LED12 to LEDn2 are successively
The LED strip that is composed in series, storage capacitor C2, first switch electronic circuit SA2, switch SC2 of second switch electronic circuit SB2 and the 3rd
Circuit.
The input connection civil power AC2 of rectifier bridge DB2, comprising two outfans.
LED strip by several LED strip joint groups of LED12 to LEDn2 into.LED strip has first end L1, the second end L2 and tap
End LC, is defined respectively as：The one end for the LED12 not being connected with other LED is first end L1, is not connected with other LED
One end of LEDn2 is the second end L2, and arbitrary series connection node of LED strip or first end are tap terminals LC.
First end L1 of LED strip be connected to an outfan of rectifier bridge DB2, the second end L2 via first switch SA2 and
One end connection of storage capacitor C2, the other end of storage capacitor C2 are connected to second outfan of rectifier bridge DB2, constitute energy and inhale
Revenue and expenditure road.
One end of second switch SB2 is connected to the joint of first switch SA2 and storage capacitor C2, and the other end is connected to
The tap terminals LC of LED strip.One end of 3rd switch SC2 is connected to the second end L2 of LED strip, and the other end is connected to rectifier bridge DB2
Another outfan.LEDn2 between storage capacitor C2, second switch SB2, the tap terminals LC of LED strip and the second end L2 and
Three switch SC2 constitute energy and release branch road.
The output of rectifier bridge DB1, LED strip and the 3rd switch the straight-through branch roads of SC2 composition LED.
Its operation principle is：
When the output voltage amplitude of rectifier bridge DB2 is more than the voltage and storage capacitor C2 both end voltage sums of LED strip, the
One switch SA2 and the conducting of energy absorption branch road；Second switch SB2, the 3rd switch SC2, energy are released branch road and the straight-through branch roads of LED
Cut-off.
When the output voltage amplitude of rectifier bridge DB2 is more than the voltage of LED strip, but less than the voltage and storage capacitor of LED strip
During C2 both end voltage sums, the straight-through branch road conductings of the 3rd switch SC2 and LED, first switch SA2, second switch SB2, energy are inhaled
Revenue and expenditure road and energy branch road of releasing is turned off.
When rectifier bridge DB2 output voltage amplitude less than LED strip voltage when, first switch SA2, energy absorption branch road and
The straight-through branch road cut-offs of LED, second switch SB2, the 3rd switch SC2 and energy are released branch road conducting.
Therefore, the circuit structure and operation principle of Fig. 2 has the advantages that：
1) peak energy of commercial power rectification voltage is absorbed using storage capacitor, the peak energy is when line voltage is relatively low
It is released in some or all of LED, it is to avoid commercial power rectification voltage magnitude is exceeded by conventional linear constant-current drive circuit
Shortcoming of the fractional conversion of LED threshold voltages into heat, thus, in actual LED illumination product design, it is possible to use compared with low pressure
The LED strip of drop.
2) due to using the LED strip compared with low pressure drop, the straight-through branch roads of LED in Fig. 2 allow LED strip in relatively low civil power
Turn under amplitude voltage, this causes the input voltage range of actual LED illumination product wider.
3) as the voltage of LED strip is relatively low so that the angle of flow of mains input current is increased, conducting dutycycle is bigger,
Therefore power factor is improved, and reduces the interference to electrical network.
4) when using AC voltage regulator be gradually lowered line voltage drop or on alternating current connect phase-cut dimmer to LED
During light modulation, in low-light level, all of LED luminance is consistent.
5) it is above-mentioned 3) and 4) so that the program is suitably applied in the occasion of AC series connection phase-cut dimmer.
It is well known that, LED be current mode drive device, but in Fig. 2 not comprising any current limit device, this be for
Simplified explanation thinking of the present utility model and circuit theory.
Following process is done to Fig. 2, a practical linear constant current drive circuit can be made：
1) the 3rd switch SC2 in Fig. 2 is replaced with into a controlled current source, and the controlled current source is made in energy absorption
Cut-off state is in when road turns on, on the contrary it is in the conduction state.
2) any position on energy absorption branch road is connected into a current source, and current source is when energy absorption branch road is turned on
With current-limiting function.
3) first switch SA2 in Fig. 2 and second switch SB2 are replaced with into diode respectively.
Fig. 3 is the novel linear constant-current drive circuit figure of embodiment one.
As shown in figure 3, novel linear constant-current drive circuit, including：Rectifier bridge DB3, LED strip, storage capacitor C3, first open
Climax circuit SA3, second switch electronic circuit SB3, first resistor R13, second resistance R23,3rd resistor R33, the first integrated electricity
The switch electronic circuit UB3 of road UA3 and the 3rd.
First switch electronic circuit SA3 is the first diode, and second switch electronic circuit SB3 is the second diode.3rd switch
Electronic circuit UB3 is the second integrated circuit.The input connection civil power AC3 of rectifier bridge DB3, the first outfan I3 is for just, second exports
End II3 ground connection.
LED strip is by several LED strip joint groups of LED13 to LEDn3 into first end L31, the second end L32 and tap terminals
L3C, is defined respectively as：The one end for the LED13 not being connected with other LED is first end L31, is not connected with other LED
One end of LEDn3 is the second end L32, and arbitrary series connection node of LED strip or first end are tap terminals L3C.
First integrated circuit UA3 and the second integrated circuit UB3 are respectively provided with three feet, and the first foot is current input terminal, and second
Foot is chip ground, and the 3rd foot is current detecting end.
The first voltage-controlled current source CCA3 and the first signal criterion VA3, the first voltage-controlled electricity are included inside first integrated circuit UA3
Stream source CCA3 includes two power ends and two control ends, and two power ends are connected respectively to the first of the first integrated circuit UA3
Foot 1 and the 3rd foot 3.One control end of the first voltage-controlled current source CCA3 is connected with the positive pole of the first signal criterion VA3, another
The 3rd foot 3 of the first integrated circuit UA3 is connected to, the negative pole of the first signal criterion VA3 is connected to the of the first integrated circuit UA3
Two feet 2.
Include inside the second integrated circuit UB3 as the 3rd switch electronic circuit：Second voltage-controlled current source CCB3 and second
Signal criterion VB3, the second voltage-controlled current source CCB3 include two power ends and two control ends, and two power ends are connected respectively to
First foot 4 of the second integrated circuit UB3 and the 3rd foot 6.One control end of the second voltage-controlled current source CCB3 and secondary signal base
The positive pole of quasi- VB3 is connected, and another control end is connected to the 3rd foot 6 of the second integrated circuit UB3, secondary signal benchmark VB3's
Negative pole is connected to the crus secunda 5 of the second integrated circuit UB3.
First end L31 of LED strip is connected to the first outfan I3 of rectifier bridge DB3, and the second end L32 connects the first diode
The anode of SA3, the negative electrode of the first diode SA3 are connected with one end of storage capacitor C3, and the other end of storage capacitor C3 is via
One resistance R13 is connected to first foot 1 of the first integrated circuit UA3, and the 3rd foot 3 of the first integrated circuit UA3 is via second resistance
R23 is grounded.
The second outfan II3 ground connection of the crus secunda 2 and rectifier bridge DB3 of the first integrated circuit UA3.
The anode of the second diode SB3 is connected to the joint of the first diode SA3 and storage capacitor C3, and negative electrode is connected to
The tap terminals L3C of LED strip.
First foot 4 of the second integrated circuit UB3 is connected to the second end L32 of LED strip, that crus secunda 5 is connected to first is integrated
First foot 1 of circuit U A3, the 3rd foot 6 are connected to the intersection of storage capacitor C3 and first resistor R13 via 3rd resistor R33.
The output of rectifier bridge DB3, LED strip, the first diode SA3, storage capacitor C3, first resistor R13, the first integrated electricity
First foot, 1 to the 3rd foot 3 on road and second resistance R23 constitute energy absorption branch road.
Storage capacitor C3, the second diode SB3, the LEDn3 between the tap terminals of LED strip and the second end, the second integrated electricity
First foot, 4 to the 3rd foot 6 of road UB3 and 3rd resistor R33 constitute energy and release branch road.
The output of rectifier bridge DB3, LED strip, 4 to the 3rd foot 6,3rd resistor R33 of the first foot of the second integrated circuit UB3,
First resistor R13,1 to the 3rd foot 2 of the first foot of the first integrated circuit UA3 and second resistance R23 constitute the straight-through branch roads of LED.
Its operation principle is：
When the output voltage amplitude of rectifier bridge DB3 is more than the voltage and storage capacitor C3 both end voltage sums of LED strip, the
One diode SA3 and the conducting of energy absorption branch road；Second diode SB3, the second integrated circuit UB3, energy are released branch road and LED
Straight-through branch road cut-off；
When the output voltage amplitude of rectifier bridge DB3 is more than the voltage of LED strip, but less than the voltage and storage capacitor of LED strip
During C3 both end voltage sums, the straight-through branch road conductings of the second integrated circuit UB3 and LED, the first diode SA3, the second diode
SB3, energy absorption branch road and energy branch road of releasing is turned off；
When the output voltage amplitude of rectifier bridge DB3 is less than the voltage of LED strip, the first diode SA3, energy absorption branch road
With the straight-through branch road cut-offs of LED, the second diode SB3, the second integrated circuit UB3 and energy are released branch road conducting.
Novel linear constant-current drive circuit in embodiment one, realizes this practicality using two independent integrated circuits new
The beneficial effect of type.
Embodiment two
Fig. 4 is the novel linear constant-current drive circuit figure of embodiment two.
As shown in figure 4, novel linear constant-current drive circuit, including rectifier bridge DB4, LED strip, storage capacitor C4, first open
Climax circuit SA4, second switch electronic circuit SB4, the 4th resistance R14, the 5th resistance R24 and the 3rd integrated circuit UA4.
First switch electronic circuit SA4 is the first diode, and second switch electronic circuit SB4 is the second diode, and the 4th is integrated
Circuit U B4 is used as the 3rd switch electronic circuit.
The input connection civil power AC4 of rectifier bridge DB4, the first outfan I4 is for just, the second outfan II4 is grounded.
LED strip is by several LED strip joint groups of LED14 to LEDn4 into first end L41, the second end L42 and tap terminals
L4C, is defined respectively as：The one end for the LED14 not being connected with other LED is first end L41, is not connected with other LED
One end of LEDn4 is the second end L42, and arbitrary series connection node of LED strip or first end are tap terminals L4C.
3rd integrated circuit UA4 and the 4th integrated circuit UB4 are respectively provided with three feet.
The 3rd voltage-controlled current source CCA4 and the 3rd signal criterion VA4, the 3rd voltage-controlled electricity are included inside 3rd integrated circuit UA4
Stream source CCA4 includes two power ends and two control ends, and two power ends are connected respectively to the first of the 3rd integrated circuit UA4
Foot 12 and the 3rd foot 14, of two control ends are connected with the positive pole of the 3rd signal criterion VA4, and another control end is connected to
3rd foot 14 of the 3rd integrated circuit UA4, the negative pole of the 3rd signal criterion VA4 are connected to the crus secunda of the 3rd integrated circuit UA4
13。
Include inside 4th integrated circuit UB4：4th voltage-controlled current source CCB4 and the 4th signal criterion VB4, the 4th is voltage-controlled
Current source CCB4 includes two power ends and two control ends, and two power ends are connected respectively to the of the 4th integrated circuit UB4
One foot 15 and the 3rd foot 17, of two control ends are connected with the positive pole of the 4th signal criterion VB4, and another is connected to the 4th
3rd foot 17 of integrated circuit UB4, the negative pole of the 4th signal criterion VB4 are connected to the crus secunda 16 of the 4th integrated circuit UB4.
First end L41 of LED strip is connected to the first outfan I4 of rectifier bridge DB4, the second end L42 and connects the first diode
The anode of SA4, the negative electrode of the first diode SA4 are connected with one end of storage capacitor C4, and the other end of storage capacitor C4 is connected to
First foot 12 of the 3rd integrated circuit UA4, the 3rd foot 14 of the 3rd integrated circuit UA4 are grounded via the 4th resistance R14.
4th the first feet of integrated circuit UB4 15 are connected to the second end L42 of LED strip, the 3rd foot 17 via the 5th resistance R24
It is connected to the 3rd foot 14 of the 3rd integrated circuit UA4.
The crus secunda 16 of the crus secunda 13 and the 4th integrated circuit UB4 of the 3rd integrated circuit UA4 is grounded.
The anode of the second diode SB4 is connected to the joint of the first diode SA4 and storage capacitor C4, and negative electrode is connected to
The tap terminals L4C of LED strip.
The output of rectifier bridge DB4, LED strip, the first diode SA4, storage capacitor C4, the first of the 3rd integrated circuit UA4
12 to the 3rd foot 14 of foot and the 4th resistance R14 constitute energy absorption branch road.
LEDn4 between storage capacitor C4, the second diode SB4, the tap terminals L4C of LED strip and the second end L42, the 4th
First foot, 15 to the 3rd foot 17 of integrated circuit UB4, the 3rd foot 14 to the first of the 5th resistance R24 and the 3rd integrated circuit UA4
Foot 12, constitutes energy and releases branch road.
The output of rectifier bridge DB4, LED strip, 15 to the 3rd foot 17 of the first foot of the 4th integrated circuit UB4, the 5th resistance
R24, the 4th resistance R14, constitute the straight-through branch roads of LED.
Its operation principle is：
When the output voltage amplitude of rectifier bridge DB4 is more than the voltage and storage capacitor C4 both end voltage sums of LED strip, the
One diode SA4 and the conducting of energy absorption branch road；Second diode SB4, the 4th integrated circuit UB4, energy are released branch road and LED
Straight-through branch road cut-off；
When the output voltage amplitude of rectifier bridge DB4 is more than the voltage of LED strip, but less than the voltage and storage capacitor of LED strip
During C4 both end voltage sums, the straight-through branch road conductings of the 4th integrated circuit UB4 and LED, the first diode SA4, the second diode
SB4, energy absorption branch road and energy branch road of releasing is turned off；
When the output voltage amplitude of rectifier bridge DB4 is less than the voltage of LED strip, the first diode SA4, energy absorption branch road
With the straight-through branch road cut-offs of LED, the second diode SB4, the 4th integrated circuit UB4 and energy are released branch road conducting.
The 3rd integrated circuit UA4 and the 4th integrated circuit UB4 in the present embodiment uses same ground level, is advantageously integrated
The beneficial effects of the utility model are realized in an encapsulation.
On the basis of all above-described embodiments, can be in one switched current source of the output two ends of rectifier bridge parallel connection, should
Switched current source is connected in parallel on the output two ends of rectifier bridge, any one conducting in energy absorption branch road and the straight-through branch roads of LED
When end, otherwise conducting, its advantage is：Maintain mains current continuous, make the preferably compatible use of this utility model
The power supply occasion of traditional controllable silicon dimmer.
Above-described embodiment is in order to illustrate and not limit this utility model, in the protection model without departing from claims
On the premise of enclosing, this programme also has various change, and these changes and improvements fall within the claimed model of this utility model
In enclosing.The element listed during those are not excluded for word "comprising" or " including " with claim or step different elements or step
Exist, element "a" or "an" is not excluded for the presence of multiple element, in the claim for enumerating several circuits, these circuits
In it is several can be showed by one, electronic device item be also it is same, merely because some methods be it is mutually different from
Described in category claim, do not illustrate that the combination of these methods can not be for making a profit.
Claims (9)
1. a kind of novel linear constant-current drive circuit, by mains-supplied, it is characterised in that：Including rectifier bridge, LED strip, energy storage electricity
Appearance, first switch electronic circuit, second switch electronic circuit and the 3rd switch electronic circuit, wherein：
The input connection civil power of the rectifier bridge, comprising two outfans；
The LED strip is by several LED strip joint groups into first end, the second end and tap terminals, the tap terminals are described
Arbitrary series connection node of LED strip or first end；
The first end of the LED strip is connected to an outfan of the rectifier bridge, the second end via first switch son electricity
One end connection of road and the storage capacitor, the other end of the storage capacitor are connected to another output of the rectifier bridge
End, constitutes energy absorption branch road；
One end of the second switch electronic circuit is connected to the joint of the first switch electronic circuit and the storage capacitor, separately
One end is connected to the tap terminals of the LED strip；
One end of the 3rd switch electronic circuit is connected to the second end of the LED strip, the other end be connected to the rectifier bridge and
The joint of the storage capacitor；
The storage capacitor, the second switch electronic circuit, the LED between the tap terminals of the LED strip and the second end and described
3rd switch electronic circuit constitutes energy and releases branch road；
Two outfans of the rectifier bridge, LED strip and the described 3rd switch the straight-through branch roads of electronic circuit composition LED.
2. novel linear constant-current drive circuit according to claim 1, it is characterised in that：When the output voltage width of rectifier bridge
When value is more than the voltage and storage capacitor both end voltage sum of the LED strip, the first switch electronic circuit and energy absorption are propped up
Road turns on；The second switch electronic circuit, the 3rd switch electronic circuit, energy are released branch road and the straight-through branch road cut-offs of the LED；
When the output voltage amplitude of rectifier bridge is more than the voltage of the LED strip, but less than the voltage and storage capacitor of the LED strip
During both end voltage sum, the 3rd switch electronic circuit and the straight-through branch road conductings of the LED, the first switch electronic circuit, the
Two switch electronic circuits, the energy absorption branch road and energy branch road of releasing is turned off；
When the output voltage amplitude of rectifier bridge is less than the voltage of the LED strip, the first switch electronic circuit, the energy are inhaled
Revenue and expenditure road and the straight-through branch road cut-offs of the LED, the second switch electronic circuit, the 3rd switch electronic circuit and the energy are released and are propped up
Road turns on.
3. novel linear constant-current drive circuit according to claim 1, it is characterised in that：Described 3rd switchs electronic circuit is
One controlled current source, the controlled current source are in cut-off state when the energy absorption branch road is turned on, otherwise are on
State, has current-limiting function during conducting state.
4. novel linear constant-current drive circuit according to claim 3, it is characterised in that：On the energy absorption branch road
Any position connect into a current source, the current source has current-limiting function when energy absorption branch road is turned on.
5. novel linear constant-current drive circuit according to claim 4, it is characterised in that：The cut-off current of the current source is big
In the cut-off current of the controlled current source.
6. novel linear constant-current drive circuit according to claim 1, it is characterised in that：The first switch electronic circuit
And/or second switch electronic circuit is a diode.
7. novel linear constant-current drive circuit according to claim 1, it is characterised in that：Also include first resistor, second
Resistance, 3rd resistor, the first integrated circuit, wherein：
First switch electronic circuit is the first diode, and second switch electronic circuit is the second diode, and the 3rd switch electronic circuit is the
Two integrated circuits；
The input connection civil power of the rectifier bridge, output first end is for just, the second end is grounded；
First integrated circuit and the second integrated circuit are respectively provided with three feet, and the first foot is current input terminal, and crus secunda is core
Piece ground, the 3rd foot are current detecting end；
First integrated circuit includes the first voltage-controlled current source and the first signal criterion, and first voltage-controlled current source includes two
Individual power end and two control ends, two power ends of first voltage-controlled current source are connected respectively to first integrated circuit
First foot and the 3rd foot, a control end of first voltage-controlled current source are connected with the positive pole of first signal criterion, separately
One control end is connected to the 3rd foot of first integrated circuit, and the negative pole of first signal criterion is connected to described first
The crus secunda of integrated circuit；
Second integrated circuit includes the second voltage-controlled current source and secondary signal benchmark, and second voltage-controlled current source includes two work(
Rate end and two control ends, two power ends of second voltage-controlled current source are connected respectively to second integrated circuit first
Foot and the 3rd foot, a control end of second voltage-controlled current source are connected with the positive pole of the secondary signal benchmark, another
Control end is connected to the 3rd foot of second integrated circuit, and it is integrated that the negative pole of the secondary signal benchmark is connected to described second
The crus secunda of circuit；
The first end of the LED strip is connected to the first end of the rectifier bridge output, the sun of the second termination first diode
Pole, the negative electrode of first diode are connected with one end of the storage capacitor, and the other end of the storage capacitor is via first
Resistance is connected to the first foot of the first integrated circuit, and the 3rd foot of the first integrated circuit is grounded via second resistance；
The crus secunda ground connection of first integrated circuit；
The anode of second diode is connected to the joint of first diode and the storage capacitor, and negative electrode is connected to
The tap terminals of the LED strip；
Second integrated circuit, first foot is connected to the second end of the LED strip, crus secunda and is connected to the described first integrated electricity
First foot on road, the 3rd foot are connected to the intersection of the storage capacitor and first resistor via 3rd resistor.
8. novel linear constant-current drive circuit according to claim 1, it is characterised in that：Also include the 4th resistance, the 5th
Resistance and the 3rd integrated circuit；Wherein：
The first switch electronic circuit is the first diode, and the second switch electronic circuit is the second diode；Described 3rd opens
Climax circuit is the 4th integrated circuit；
The input connection civil power of the rectifier bridge, output first end is for just, the second end is grounded；
3rd integrated circuit and the 4th integrated circuit are respectively provided with three feet, and the first foot is current input terminal, and crus secunda is core
Piece ground, the 3rd foot are current detecting end；
3rd integrated circuit includes the 3rd voltage-controlled current source and the 3rd signal criterion, and the 3rd voltage-controlled current source includes two
Individual power end and two control ends, two power ends of the 3rd voltage-controlled current source are connected respectively to the 3rd integrated circuit
The first foot and the 3rd foot, a control end of the 3rd voltage-controlled current source is connected with the positive pole of the 3rd signal criterion,
Another control end is connected to the 3rd foot of the 3rd integrated circuit, and the negative pole of the 3rd signal criterion is connected to described
The crus secunda of three integrated circuits；
4th integrated circuit includes the 4th voltage-controlled current source and the 4th signal criterion, and the 4th voltage-controlled current source includes two
Individual power end and two control ends, two power ends of the 4th voltage-controlled current source are connected respectively to the 4th integrated circuit
The first foot and the 3rd foot, a control end of the 4th voltage-controlled current source is connected with the positive pole of the 4th signal criterion,
Another is connected to the 3rd foot of the 4th integrated circuit, and it is integrated that the negative pole of the 4th signal criterion is connected to the described 4th
The crus secunda of circuit；
The first end of the LED strip is connected to the first end of the rectifier bridge output, the sun of the second termination first diode
Pole, the negative electrode of first diode are connected with one end of the storage capacitor, and the other end of the storage capacitor is connected to institute
The first foot of the 3rd integrated circuit is stated, the 3rd foot of the 3rd integrated circuit is via the 4th resistance eutral grounding；
The first foot of 4th integrated circuit is connected to the second end of the LED strip, the 3rd foot and connects via the 5th resistance
To the 3rd foot of the 3rd integrated circuit；
The crus secunda of the 3rd integrated circuit and the 4th integrated circuit is grounded；
The anode of second diode is connected to the joint of first diode and the storage capacitor, and negative electrode is connected to
The tap terminals of the LED strip.
9. novel linear constant-current drive circuit according to any one of claim 1 to 8, it is characterised in that：Also include one
It is connected in parallel on the switched current source that the rectifier bridge exports two ends, the switched current source is in the energy absorption branch road and described
Any one in the straight-through branch roads of LED is ended when conducting, on the contrary conducting.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621166344.0U CN206118126U (en) | 2016-10-25 | 2016-10-25 | Novel linear constant -current drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621166344.0U CN206118126U (en) | 2016-10-25 | 2016-10-25 | Novel linear constant -current drive circuit |
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| CN206118126U true CN206118126U (en) | 2017-04-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413192A (en) * | 2016-10-25 | 2017-02-15 | 上海路傲电子科技有限公司 | Linear constant current drive circuit |
| CN107979898A (en) * | 2017-12-27 | 2018-05-01 | 苏州菲达旭微电子有限公司 | Low-voltage LED linear drive circuit |
| WO2021169210A1 (en) * | 2020-02-28 | 2021-09-02 | 广州市浩洋电子股份有限公司 | Led dimming device used for speeding up constant-current source inductive energy discharge |
| CN113597052A (en) * | 2019-06-06 | 2021-11-02 | 上海路傲电子科技有限公司 | Chip driving circuit, chip, linear constant current driving circuit and control method |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106413192A (en) * | 2016-10-25 | 2017-02-15 | 上海路傲电子科技有限公司 | Linear constant current drive circuit |
| WO2018077021A1 (en) * | 2016-10-25 | 2018-05-03 | 上海路傲电子科技有限公司 | Linear constant-current driver circuit |
| US10687401B2 (en) | 2016-10-25 | 2020-06-16 | Shanghai Looall Electronics Co., Ltd | Linear constant current drive circuit |
| CN106413192B (en) * | 2016-10-25 | 2020-12-15 | 上海路傲电子科技有限公司 | Linear constant current driving circuit |
| CN107979898A (en) * | 2017-12-27 | 2018-05-01 | 苏州菲达旭微电子有限公司 | Low-voltage LED linear drive circuit |
| CN113597052A (en) * | 2019-06-06 | 2021-11-02 | 上海路傲电子科技有限公司 | Chip driving circuit, chip, linear constant current driving circuit and control method |
| CN113597052B (en) * | 2019-06-06 | 2024-03-22 | 上海路傲电子科技有限公司 | Chip driving circuit, chip, linear constant current driving circuit and control method |
| WO2021169210A1 (en) * | 2020-02-28 | 2021-09-02 | 广州市浩洋电子股份有限公司 | Led dimming device used for speeding up constant-current source inductive energy discharge |
| US11849513B2 (en) | 2020-02-28 | 2023-12-19 | Guangzhou Haoyang Electronic Co., Ltd. | LED dimming device with high refresh rate and smooth dimming |
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Denomination of utility model: A new linear constant current driving circuit Effective date of registration: 20220104 Granted publication date: 20170419 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: Y2022310000002 |
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Date of cancellation: 20230412 Granted publication date: 20170419 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: Y2022310000002 |