CN201550320U - Multipath constant current control circuit suitable for LED drivers - Google Patents
Multipath constant current control circuit suitable for LED drivers Download PDFInfo
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- CN201550320U CN201550320U CN2009201981057U CN200920198105U CN201550320U CN 201550320 U CN201550320 U CN 201550320U CN 2009201981057 U CN2009201981057 U CN 2009201981057U CN 200920198105 U CN200920198105 U CN 200920198105U CN 201550320 U CN201550320 U CN 201550320U
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Abstract
The utility model discloses a multipath constant current control circuit suitable for LED drivers. The multipath constant current control circuit comprises one single-output constant current source and a plurality of output circuits, and is characterized in that each output circuit is composed of a current equalizing circuit, a current equalizing control circuit and a load composed of a plurality of LED lamps, wherein sampling signals of a sampling resistance to the output current are inputted into each current equalizing control circuit, and become a public connecting wire after being converted by the current equalizing circuit so as to be connected with other paths to form a current equalizing bus, after each path of current sampling signals and the voltage of the current equalizing bus are compared and regulated in the current equalizing control circuit, output signals of the current equalizing control circuit can control the impedance of a corresponding current equalizing circuit linear adjustment transistor, and then controls each path of current for realizing the current equalizing. The multipath constant current control circuit is simple in structure, is low in cost, and is suitable for post-stage multipath constant current control for a standard single-path constant current power supply.
Description
Technical field
The utility model relates to a kind of multichannel constant-current control circuit of led driver.Should be a kind of constant-current drive circuit that is used for LED, the technology of current-sharing between multichannel in the time of can realizing LED multi-path load parallel connection use specifically.
Background technology
For the application of LED multiple constant current control, the most frequently used scheme has: 1. constant voltage module+multichannel non-isolation DC/DC constant-current circuit (as the BUCK circuit); 2. the adjustable Voltage stabilizing module of voltage+multi-channel linear is adjusted constant-current circuit.
For first kind of scheme, with reference to Fig. 1, the output of constant voltage module is as the input of multiple constant current circuit, and every road constant-current circuit is done constant current control separately, is easy to guarantee the current-sharing of multichannel output current.But since every road constant-current source need an independent control the DC/DC converter, so circuit complexity, cost height.
For second kind of scheme, with reference to Fig. 2, do linear the adjustment with metal-oxide-semiconductor or triode and realize multiple constant current control, the output voltage of prime Voltage stabilizing module is followed the linear circuit of adjusting of back level constant current, the output voltage of Voltage stabilizing module makes the linear circuit of adjusting can realize that in the output of every road the power consumption on the basis of accurate constant current control is approaching all the time minimum all the time than the highest Lu Lvegao of output voltage in the multi-channel linear adjustment constant-current circuit.Though this scheme circuit cost is low, the current sharing on every road is good, but it is selective that the adjustable prime Voltage stabilizing module of voltage that can realize above-mentioned voltage follow control does not generally have ready-made reference power supply, need customized development, the design cost height, owing to can not select standard constant voltage or the constant-current supply that has authenticated for use, also to additionally pay expensive certification fee for the product that needs the safety authentication.
Summary of the invention
The utility model proposes a kind of simple circuit of using at the problems referred to above, realizes the well behaved multichannel output of current-sharing LED constant current control.
The technical scheme that addresses the above problem employing is: a kind of multichannel constant-current control circuit that is applicable to led driver, comprise a single output constant-current source and multiplex output circuit, it is characterized in that described each output circuit comprises a flow equalizing circuit, an equalizing control circuit and the load of being made up of a plurality of LED lamps, the output plus terminal of described load one termination constant-current source, the input of another termination flow equalizing circuit, the output negativing ending grounding of described constant-current source;
Described flow equalizing circuit comprises a sample resistance and the linear pipe of adjusting, the input of its output termination equalizing control circuit;
The input of described every way equalizing control circuit is from the sampled signal of this road sample resistance to output current, through becoming public connecting line after this road flow equalizing circuit conversion, link together with other each road, become the current-sharing bus, every road current sampling signal and current-sharing bus voltage are after equalizing control circuit inside compares adjusting, the flow equalizing circuit linearity of the output signal may command correspondence of equalizing control circuit is adjusted the impedance magnitude of pipe, controls the size of every road electric current then, realizes current-sharing.
The beneficial effects of the utility model:
1. the main circuit and the control circuit of multiple constant current control are simple in structure, and cost is low.
2. multichannel constant-current control circuit is independent of single output constant-current source, can be used as module and independently uses, be applicable to the single channel constant-current supply of standard after grade multiple constant current control.When prime single channel constant-current source need change the current stabilization value because of light modulation, multichannel output constant-current control circuit still can keep every road electric current to divide equally automatically.
According to the utility model, the described linear pipe of adjusting is MOSFET or triode.One preferred embodiment is: described linear first utmost point of adjusting pipe connects the output of load, and second utmost point accesses an end of sample resistance, and the control utmost point connects the control signal output ends of equalizing control circuit; The other end ground connection of described sample resistance.
According to the utility model, described equalizing control circuit comprises an amplifier, it imports positive termination current-sharing bus, connects the sampling end of input negative terminal and sample resistance behind the input resistance of connecting simultaneously, the control utmost point of the output of amplifier wiring adjustment pipe directly or behind the output resistance of connecting.
According to the utility model, described equalizing control circuit comprises an amplifier and a N type triode, the positive termination current-sharing of the input of described amplifier bus, connect simultaneously and connect the sampling end of input negative terminal and sample resistance behind the input resistance, the output of amplifier is connected and is connect the base stage of triode behind the resistance, the grounded emitter of triode, the control utmost point of collector electrode wiring adjustment pipe.
According to the utility model, described equalizing control circuit comprises two amplifiers, three resistance and a diode, wherein an end of positive termination first resistance of the input of first amplifier and the sampling end of sample resistance, the input negative terminal of first amplifier connects the anode of diode, one end of the 3rd resistance and current-sharing bus, the negative electrode of diode connects the output of first amplifier, the input negative terminal of another termination second amplifier of first resistance, one end of input anode second resistance of second amplifier and the other end of the 3rd resistance, the control utmost point of another termination power of second resistance, the output of second amplifier wiring adjustment pipe directly or behind another resistance of connecting.
According to the utility model, described equalizing control circuit comprises two amplifiers, four resistance, a diode and a triode, wherein an end of positive termination first resistance of the input of first amplifier and the sampling end of sample resistance, the input negative terminal of first amplifier connects the anode of diode, one end of the 3rd resistance and current-sharing bus, the negative electrode of diode connects the output of first amplifier, the input negative terminal of another termination second amplifier of first resistance, one end of input anode second resistance of second amplifier and the other end of the 3rd resistance, another termination power of second resistance, one end of output termination the 4th resistance of second amplifier, the base stage of another termination triode of the 4th resistance, the grounded emitter of triode, the control utmost point of the collector electrode wiring adjustment pipe of triode.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 prior art circuits block diagram one.
Fig. 2 prior art circuits block diagram two.
One of Fig. 3 circuit structure block diagram of the present utility model.
Fig. 4 the utility model realize circuit structure one first kind of execution mode.
Fig. 5 the utility model realize circuit structure one second kind of execution mode.
Fig. 6 the utility model realize circuit structure one the third execution mode.
Fig. 7 the utility model realize circuit structure one the 4th kind of execution mode.
Fig. 8 the utility model realize circuit structure one the 5th kind of execution mode.
Fig. 9 the utility model realize circuit structure one the 6th kind of execution mode.
Specific embodiment
With reference to Fig. 4, described AC-input voltage Vac gives each paths of LEDs electric as the input of constant-current source through exporting continuous current (Io) behind the constant-current source.Described LED load be the LED lamp of multichannel (n road) a plurality of (m) series connection form (as LED11 ... LEDm1 ..., LED1n ... LEDmn).For convenience of explanation, be that example illustrates with the first via (1) in the load of n paths of LEDs here.
Described load LED11 ... the flow equalizing circuit 1 that LEDm1 series connection back connection adjustment pipe S1 and sample resistance Rs1 form.
Adjustment pipe (MOSFET) S1 first end of described flow equalizing circuit 1 is connected to the LED load, adjusts pipe S1 second end and is connected to sample resistance Rs1, and the other end of sample resistance Rs1 is connected to output ground, links to each other with constant-current source output ground.
Described equalizing control circuit 1 is by resistance R 1, and amplifier IC1 forms.
The backward end of the amplifier IC1 of described equalizing control circuit 1 is connected to the end of sample resistance Rs1, as current sampling signal VRs1, connects an end of resistance R 1 simultaneously, and an other end of resistance R 1 is connected to the end in the same way of amplifier IC1.The output of amplifier IC1 is connected to the 3rd end of the adjustment pipe S1 of flow equalizing circuit 1.The end in the same way of amplifier IC1 is connected to the end of resistance R b simultaneously, and links together as the public terminal on common port and other road, is called the current-sharing bus.The other end of resistance R b is connected to VCC.
Described current sampling signal (VRs1, ..., VRsn) through resistance (Rs1, ..., Rsn) be connected on the current-sharing bus, the voltage that obtains on the current-sharing bus is average current signal Vshare=(VRs1+...VRsn)/n and every road self current sampling signal (VRs1 of each road output, ..., VRsn) compare.If the electric current on certain road is less than average current, then the amplifier output voltage is a high level, and this road adjustment is guaranteed adequate food and conducting, when other electric current than main road when adjustment progressively reduces electric current, this road electric current progressively increases automatically up near average current; If the electric current on certain road is greater than average current, then the amplifier output voltage progressively reduces, and this road adjustment plumber is done at linear condition, and the LED electric current progressively reduces up near average current; If certain road electric current equals average current, because the bias of resistance R b, then amplifier is output as high level, thereby this road adjustment is guaranteed adequate food and conducting.Arbitrary paths of LEDs voltage is low more, and the amplifier output voltage is just low more, and it is big more to adjust tube voltage, and is many more thereby the LED electric current reduces.
Described adjustment pipe S1 also can be devices such as IGBT.
With reference to Fig. 5, described AC-input voltage Vac gives each paths of LEDs electric as the input of constant-current source through exporting continuous current (Io) behind the constant-current source.Described LED load be the LED lamp of multichannel (n road) a plurality of (m) series connection form (as LED11 ... LEDm1 ..., LED1n ... LEDmn).For convenience of explanation, be that example illustrates with the first via (1) in the load of n paths of LEDs here.
Described load LED11 ... the flow equalizing circuit 1 that LEDm1 series connection back connection adjustment pipe S1 and sample resistance Rs1 form.
The adjustment pipe of described flow equalizing circuit 1 (NPN triode) S1 first end is connected to the LED load, adjusts pipe S1 second end and is connected to sample resistance Rs1, and the other end of sample resistance Rs1 is connected to output ground, links to each other with constant-current source output ground.
Described equalizing control circuit 1 is by resistance R 11, resistance R 21, and amplifier IC1 forms.
The backward end of the amplifier IC1 of described equalizing control circuit 1 is connected to the end of sample resistance Rs1, as current sampling signal VRs1, connects an end of resistance R 11 simultaneously, and an other end of resistance R 11 is connected to the end in the same way of amplifier IC1.The output of amplifier IC1 is connected to first end of resistance R 21, and an other end of resistance R 21 is connected to the 3rd end of the adjustment pipe S1 of flow equalizing circuit 1.The end in the same way of amplifier IC1 is connected to the end of resistance R b simultaneously, and links together as the public terminal on common port and other road, is called the current-sharing bus.The other end of resistance R b is connected to VCC.
Described current sampling signal (VRs1, ..., VRsn) through resistance (Rs1, ..., Rsn) be connected on the current-sharing bus, the voltage that obtains on the current-sharing bus is average current signal Vshare=(VRs1+...VRsn)/n and every road self current sampling signal (VRs1 of each road output, ..., VRsn) compare.If the electric current on certain road is less than average current, then the amplifier output voltage is a high level, and this road adjustment is guaranteed adequate food and conducting, when other electric current than main road when adjustment progressively reduces electric current, this road electric current progressively increases automatically up near average current; If the electric current on certain road is greater than average current, then the amplifier output voltage progressively reduces, and this road adjustment plumber is done at linear condition, and the LED electric current progressively reduces up near average current; If certain road electric current equals average current, because the bias of resistance R b, then amplifier is output as high level, thereby this road adjustment is guaranteed adequate food and conducting.Arbitrary paths of LEDs voltage is low more, and the amplifier output voltage is just low more, and it is big more to adjust tube voltage, and is many more thereby the LED electric current reduces.
With reference to Fig. 6, described AC-input voltage Vac gives each paths of LEDs electric as the input of constant-current source through exporting continuous current (Io) behind the constant-current source.Described LED load be the LED lamp of multichannel (n road) a plurality of (m) series connection form (as LED11 ... LEDm1 ..., LED1n ... LEDmn).For convenience of explanation, be that example illustrates with the first via (1) in the load of n paths of LEDs here.
Described load LED11 ... the flow equalizing circuit 1 that LEDm1 series connection back connection adjustment pipe S1 and sample resistance Rs1 form.
The adjustment pipe of described flow equalizing circuit 1 (PNP triode) S1 first end is connected to the LED load, adjusts pipe S1 second end and is connected to sample resistance Rs1, and the other end of sample resistance Rs1 is connected to output ground, links to each other with constant-current source output ground.
Described equalizing control circuit 1 is by resistance R 11, resistance R 21, and triode Q1, amplifier IC1 forms.
The backward end of the amplifier IC1 of described equalizing control circuit 1 is connected to the end of sample resistance Rs1, as current sampling signal VRs1, connects an end of resistance R 11 simultaneously, and an other end of resistance R 11 is connected to the end in the same way of amplifier IC1.The output of amplifier IC1 is connected to first end of resistance R 21, and an other end of resistance R 21 is connected to the base stage of triode Q1, and the emission collection of triode Q1 is connected to output ground, and the collector electrode of triode Q1 is connected to the 3rd end of the adjustment pipe S1 of flow equalizing circuit 1.The end in the same way of amplifier IC1 is connected to the end of resistance R b simultaneously, and links together as the public terminal on common port and other road, is called the current-sharing bus.The other end of resistance R b is connected to VCC.
Described current sampling signal (VRs1, ..., VRsn) through resistance (Rs1, ..., Rsn) be connected on the current-sharing bus, the voltage that obtains on the current-sharing bus is average current signal Vshare=(VRs1+...VRsn)/n and every road self current sampling signal (VRs1 of each road output, ..., VRsn) compare.If the electric current on certain road is less than average current, then the amplifier output voltage is a high level, and this road adjustment is guaranteed adequate food and conducting, when other electric current than main road when adjustment progressively reduces electric current, this road electric current progressively increases automatically up near average current; If the electric current on certain road is greater than average current, then the amplifier output voltage progressively reduces, and this road adjustment plumber is done at linear condition, and the LED electric current progressively reduces up near average current; If certain road electric current equals average current, because the bias of resistance R b, then amplifier is output as high level, thereby this road adjustment is guaranteed adequate food and conducting.Arbitrary paths of LEDs voltage is low more, and the amplifier output voltage is just low more, and it is big more to adjust tube voltage, and is many more thereby the LED electric current reduces.
With reference to Fig. 7, described AC-input voltage Vac gives each paths of LEDs electric as the input of constant-current source through exporting continuous current (Io) behind the constant-current source.Described LED load be the LED lamp of multichannel (n road) a plurality of (m) series connection form (as LED11 ... LEDm1 ..., LED1n ... LEDmn).For convenience of explanation, be that example illustrates with the first via (1) in the load of n paths of LEDs here.
Described load LED11 ... the flow equalizing circuit 1 that LEDm1 series connection back connection adjustment pipe S1 and sample resistance Rs1 form.
Adjustment pipe (MOSFET) S1 first end of described flow equalizing circuit 1 is connected to the LED load, adjusts pipe S1 second end and is connected to sample resistance Rs1, and the other end of sample resistance Rs1 is connected to output ground, links to each other with constant-current source output ground.
Described equalizing control circuit 1 is by resistance R 11, resistance R 21, and resistance R 31, diode D1, amplifier IC11, amplifier IC21 forms.
The end in the same way of the amplifier IC11 of described equalizing control circuit 1 is connected to the end of sample resistance Rs1, as current sampling signal VRs1, connects an end of resistance R 11 simultaneously, and an other end of resistance R 11 is connected to the backward end of amplifier IC21.The backward end of amplifier IC11 is connected to the anode of diode D1, and the negative electrode of diode D1 is connected to the output of amplifier IC11.The end in the same way of amplifier IC21 is connected to an end of resistance R 21 and an end of resistance R 31, and an other end of resistance R 21 is connected to VCC.The output of amplifier IC21 is connected to the 3rd end of the adjustment pipe S1 of flow equalizing circuit 1.The backward end of amplifier IC11 is connected to the other end of resistance R 31, is connected to the end of resistance R b simultaneously, and links together as the public terminal on common port and other road, is called the current-sharing bus.The other end of resistance R b is connected to VCC.
Described current sampling signal (VRs1, ..., VRsn) through behind amplifier IC11 and the diode D1, the voltage that obtains on the current-sharing bus is the minimum value signal Vshare=Min (VRs1 of each road output current, ..., VRsn) and every road self current sampling signal (VRs1, ..., VRsn) compare.If the electric current on certain road is greater than minimum current, then the amplifier output voltage progressively reduces, and this road adjustment plumber is done at linear condition, and the LED electric current progressively reduces up near minimum current; If certain road electric current equals minimum current, because the bias of resistance R b, then amplifier is output as high level, thereby this road adjustment is guaranteed adequate food and conducting.Arbitrary paths of LEDs voltage is low more, and the amplifier output voltage is just low more, and it is big more to adjust tube voltage, and is many more thereby the LED electric current reduces.
Described adjustment pipe S1 also can be devices such as IGBT.
With reference to Fig. 8, described AC-input voltage Vac gives each paths of LEDs electric as the input of constant-current source through exporting continuous current (Io) behind the constant-current source.Described LED load be the LED lamp of multichannel (n road) a plurality of (m) series connection form (as LED11 ... LEDm1 ..., LED1n ... LEDmn).For convenience of explanation, be that example illustrates with the first via (1) in the load of n paths of LEDs here.
Described load LED11 ... the flow equalizing circuit 1 that LEDm1 series connection back connection adjustment pipe S1 and sample resistance Rs1 form.
The adjustment pipe of described flow equalizing circuit 1 (NPN triode) S1 first end is connected to the LED load, adjusts pipe S1 second end and is connected to sample resistance Rs1, and the other end of sample resistance Rs1 is connected to output ground, links to each other with constant-current source output ground.
Described equalizing control circuit 1 is by resistance R 11, resistance R 21, and resistance R 31, resistance R 41, diode D1, amplifier IC11, amplifier IC21 forms.
The end in the same way of the amplifier IC11 of described equalizing control circuit 1 is connected to the end of sample resistance Rs1, as current sampling signal VRs1, connects an end of resistance R 11 simultaneously, and an other end of resistance R 11 is connected to the backward end of amplifier IC21.The backward end of amplifier IC11 is connected to the anode of diode D1, and the negative electrode of diode D1 is connected to the output of amplifier IC11.The end in the same way of amplifier IC21 is connected to an end of resistance R 21 and an end of resistance R 31, and an other end of resistance R 21 is connected to VCC.The output of amplifier IC21 is connected to an end of resistance R 41, and an other end of resistance R 41 is connected to the 3rd end of the adjustment pipe S1 of flow equalizing circuit 1.The backward end of amplifier IC11 is connected to the other end of resistance R 31, is connected to the end of resistance R b simultaneously, and links together as the public terminal on common port and other road, is called the current-sharing bus.The other end of resistance R b is connected to VCC.
Described current sampling signal (VRs1, ..., VRsn) through behind amplifier IC11 and the diode D1, the voltage that obtains on the current-sharing bus is the minimum value signal Vshare=Min (VRs1 of each road output current, ..., VRsn) and every road self current sampling signal (VRs1, ..., VRsn) compare.If the electric current on certain road is greater than minimum current, then the amplifier output voltage progressively reduces, and this road adjustment plumber is done at linear condition, and the LED electric current progressively reduces up near minimum current; If certain road electric current equals minimum current, because the bias of resistance R b, then amplifier is output as high level, thereby this road adjustment is guaranteed adequate food and conducting.Arbitrary paths of LEDs voltage is low more, and the amplifier output voltage is just low more, and it is big more to adjust tube voltage, and is many more thereby the LED electric current reduces.
With reference to Fig. 9, described AC-input voltage Vac gives each paths of LEDs electric as the input of constant-current source through exporting continuous current (Io) behind the constant-current source.Described LED load be the LED lamp of multichannel (n road) a plurality of (m) series connection form (as LED11 ... LEDm1 ..., LED1n ... LEDmn).For convenience of explanation, be that example illustrates with the first via (1) in the load of n paths of LEDs here.
Described load LED11 ... the flow equalizing circuit 1 that LEDm1 series connection back connection adjustment pipe S1 and sample resistance Rs1 form.
The adjustment pipe of the switching tube of described flow equalizing circuit 1 (PNP triode) S1 first end is connected to the LED load, adjusts pipe S1 second end and is connected to sample resistance Rs1, and the other end of sample resistance Rs1 is connected to output ground, links to each other with constant-current source output ground.
Described equalizing control circuit 1 is by resistance R 11, resistance R 21, and resistance R 31, resistance R 41, triode Q1, diode D1, amplifier IC11, amplifier IC21 forms.
The end in the same way of the amplifier IC11 of described equalizing control circuit 1 is connected to the end of sample resistance Rs1, as current sampling signal VRs1, connects an end of resistance R 11 simultaneously, and an other end of resistance R 11 is connected to the backward end of amplifier IC21.The backward end of amplifier IC11 is connected to the anode of diode D1, and the negative electrode of diode D1 is connected to the output of amplifier IC11.The end in the same way of amplifier IC21 is connected to an end of resistance R 21 and an end of resistance R 31, and an other end of resistance R 21 is connected to VCC.The output of amplifier IC21 is connected to an end of resistance R 41, and an other end of resistance R 41 is connected to the base stage of triode Q1, and the emitter of triode Q1 is connected to output ground, and the collector electrode of triode is connected to the 3rd end of the adjustment pipe S1 of flow equalizing circuit 1.The backward end of amplifier IC11 is connected to the other end of resistance R 31, is connected to the end of resistance R b simultaneously, and links together as the public terminal on common port and other road, is called the current-sharing bus.The other end of resistance R b is connected to VCC.
Described current sampling signal (VRs1, ..., VRsn) through behind amplifier IC11 and the diode D1, the voltage that obtains on the current-sharing bus is the minimum value signal Vshare=Min (VRs1 of each road output current, ..., VRsn) and every road self current sampling signal (VRs1, ..., VRsn) compare.If the electric current on certain road is greater than minimum current, then the amplifier output voltage progressively reduces, and this road adjustment plumber is done at linear condition, and the LED electric current progressively reduces up near minimum current; If certain road electric current equals minimum current, because the bias of resistance R b, then amplifier is output as high level, thereby this road adjustment is guaranteed adequate food and conducting.Arbitrary paths of LEDs voltage is low more, and the amplifier output voltage is just low more, and it is big more to adjust tube voltage, and is many more thereby the LED electric current reduces.
At last, it is also to be noted that what more than enumerate only is specific embodiment of the utility model.Obviously, the utility model is not limited to above embodiment, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from the disclosed content of the utility model all should be thought the protection range of utility model.
Claims (7)
1. multichannel constant-current control circuit that is applicable to led driver, comprise a single output constant-current source and multiplex output circuit, it is characterized in that described each output circuit comprises a flow equalizing circuit, an equalizing control circuit and the load of being made up of a plurality of LED lamps, the output plus terminal of described load one termination constant-current source, the input of another termination flow equalizing circuit, the output negativing ending grounding of described constant-current source;
Described flow equalizing circuit comprise a sample resistance (Rs1 ... Rsn) and one linear adjust pipe (S1, ... Sn), the input of its output termination equalizing control circuit;
The input of described every way equalizing control circuit comes this road from taking a sample resistance (Rs1, ... Rsn) to the sampled signal (VRs1 of output current, ... VRsn), through becoming public connecting line after this road flow equalizing circuit conversion, link together with other each road, become the current-sharing bus, every road current sampling signal (VRs1, ... VRsn) and current-sharing bus voltage (Vshare) after equalizing control circuit inside compares adjusting, the linear adjustment pipe of the flow equalizing circuit of the output signal may command correspondence of equalizing control circuit (S1, ... impedance magnitude Sn), control the size of every road electric current then, realize current-sharing.
2. the multichannel constant-current control circuit that is applicable to led driver as claimed in claim 1, it is characterized in that described linear adjust pipe (S1, ... Sn) be MOSFET, triode, IGBT.
3. the multichannel constant-current control circuit that is applicable to led driver as claimed in claim 1, it is characterized in that the described linear pipe (S1 that adjusts, ... first utmost point Sn) connects the output of load, second utmost point accesses sample resistance (Rs1, ... end Rsn), the control utmost point connects the control signal output ends of equalizing control circuit; Described sample resistance (Rs1 ... other end ground connection Rsn).
4. the multichannel constant-current control circuit that is applicable to led driver as claimed in claim 1, it is characterized in that described equalizing control circuit comprises an amplifier (C1), it imports positive termination current-sharing bus, connect simultaneously and connect the sampling end of input negative terminal and sample resistance (Rs1) behind the input resistance (R11), the control utmost point of the output of amplifier (C1) wiring adjustment pipe (S1) directly or behind the output resistance of connecting.
5. the multichannel constant-current control circuit that is applicable to led driver as claimed in claim 1, it is characterized in that described equalizing control circuit comprises an amplifier (C1) and a N type triode (Q1), the positive termination current-sharing of the input bus of described amplifier (C1), connect simultaneously and connect the sampling end of input negative terminal and sample resistance (Rs1) behind the input resistance (R11), the output of amplifier (C1) is connected and is connect the base stage of triode (Q1) behind the resistance, the grounded emitter of triode (Q1), the control utmost point of collector electrode wiring adjustment pipe (S1).
6. the multichannel constant-current control circuit that is applicable to led driver as claimed in claim 1, it is characterized in that described equalizing control circuit comprises two amplifier (IC11, IC21), three resistance (R11, R21, R31) and a diode (D1), the sampling end of an end of positive termination first resistance of the input of first amplifier (C11) (R11) and sample resistance (Rs1) wherein, the input negative terminal of first amplifier (IC11) connects the anode of diode (D1), one end of the 3rd resistance (R31) and current-sharing bus, the negative electrode of diode (D1) connects the output of first amplifier (IC11), the input negative terminal of another termination second amplifier (IC21) of first resistance (R11), one end of input anode second resistance (R21) of second amplifier (IC21) and the other end of the 3rd resistance (R31), the control utmost point of another termination power (Vcc) of second resistance (R21), the output of second amplifier (IC21) wiring adjustment pipe (S1) directly or behind another resistance of connecting.
7. the multichannel constant-current control circuit that is applicable to led driver as claimed in claim 1, it is characterized in that described equalizing control circuit comprises two amplifier (IC11, IC21), four resistance (R11, R21, R31, R41), a diode (D1) and a triode (Q1), the sampling end of an end of positive termination first resistance of the input of first amplifier (C11) (R11) and sample resistance (Rs1) wherein, the input negative terminal of first amplifier (IC11) connects the anode of diode (D1), one end of the 3rd resistance (R31) and current-sharing bus, the negative electrode of diode (D1) connects the output of first amplifier (IC11), the input negative terminal of another termination second amplifier (IC21) of first resistance (R11), one end of input anode second resistance (R21) of second amplifier (IC21) and the other end of the 3rd resistance (R31), another termination power (Vcc) of second resistance (R21), one end of output termination the 4th resistance (R4) of second amplifier (IC21), the base stage of another termination triode (Q1) of the 4th resistance (R4), the grounded emitter of triode (Q1), the control utmost point of the collector electrode wiring adjustment pipe (S1) of triode (Q1).
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| CN2009201981057U CN201550320U (en) | 2009-10-01 | 2009-10-01 | Multipath constant current control circuit suitable for LED drivers |
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| CN2009201981057U CN201550320U (en) | 2009-10-01 | 2009-10-01 | Multipath constant current control circuit suitable for LED drivers |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102458005A (en) * | 2010-10-22 | 2012-05-16 | 英飞特电子（杭州）有限公司 | Multiplexed output current equalizing circuit for LED (Light Emitting Diode) |
| CN102548109A (en) * | 2010-12-30 | 2012-07-04 | 英飞特电子（杭州）有限公司 | Load driving device and system |
| CN101674693B (en) * | 2009-10-01 | 2012-07-18 | 英飞特电子（杭州）有限公司 | Multichannel constant-current control circuit applicable to LED driver |
| WO2012136030A1 (en) * | 2011-04-02 | 2012-10-11 | 英飞特电子（杭州）有限公司 | Circuit for adjusting led current |
| CN103096567A (en) * | 2011-11-07 | 2013-05-08 | 英飞特电子（杭州）股份有限公司 | Multi-channel current control circuit and control method |
| WO2013155904A1 (en) * | 2012-04-18 | 2013-10-24 | 深圳市顶点先进科技有限公司 | Power supply |
| WO2014082427A1 (en) * | 2012-11-29 | 2014-06-05 | 华为技术有限公司 | Power supply circuit and method |
-
2009
- 2009-10-01 CN CN2009201981057U patent/CN201550320U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101674693B (en) * | 2009-10-01 | 2012-07-18 | 英飞特电子（杭州）有限公司 | Multichannel constant-current control circuit applicable to LED driver |
| CN102458005A (en) * | 2010-10-22 | 2012-05-16 | 英飞特电子（杭州）有限公司 | Multiplexed output current equalizing circuit for LED (Light Emitting Diode) |
| CN102458005B (en) * | 2010-10-22 | 2013-12-25 | 英飞特电子（杭州）股份有限公司 | Multiplexed output current equalizing circuit for LED (Light Emitting Diode) |
| CN102548109A (en) * | 2010-12-30 | 2012-07-04 | 英飞特电子（杭州）有限公司 | Load driving device and system |
| CN102548109B (en) * | 2010-12-30 | 2014-05-28 | 英飞特电子（杭州）股份有限公司 | Load driving device and system |
| WO2012136030A1 (en) * | 2011-04-02 | 2012-10-11 | 英飞特电子（杭州）有限公司 | Circuit for adjusting led current |
| US9018845B2 (en) | 2011-04-02 | 2015-04-28 | Inventronics (Hangzhou), Inc. | Circuit for adjusting LED current |
| CN103096567A (en) * | 2011-11-07 | 2013-05-08 | 英飞特电子（杭州）股份有限公司 | Multi-channel current control circuit and control method |
| CN103096567B (en) * | 2011-11-07 | 2015-02-18 | 英飞特电子（杭州）股份有限公司 | Multi-channel current control circuit and control method |
| WO2013155904A1 (en) * | 2012-04-18 | 2013-10-24 | 深圳市顶点先进科技有限公司 | Power supply |
| WO2014082427A1 (en) * | 2012-11-29 | 2014-06-05 | 华为技术有限公司 | Power supply circuit and method |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20100811 Effective date of abandoning: 20091001 |