CN203596744U - LED array interface circuit comprising three-winding coupling inductor - Google Patents
LED array interface circuit comprising three-winding coupling inductor Download PDFInfo
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Abstract
The utility model discloses an LED array interface circuit comprising a three-winding coupling inductor, and the circuit consists of n channel circuits and one multi-channel current controller with a function of dimming. The channel circuit j (j is a positive integer from one to n) consists of an input capacitor Cij, an inductor Lj, an N-MOS main tube Mj, three-winding coupling capacitors Laj, Lbj and Lcj, an auxiliary diode Daj, an auxiliary diode Dbj, an auxiliary diode Dcj, an N-MOS auxiliary tube Maj, a TVS tube TVSj, and an output capacitor Coj. The multi-channel current controller, which is matched with the channel circuit j and has a function of dimming, is provided with a port vc, a port vs, a port vgj, a port vsj, a port vgaj, a port vsenj, and a port vpj. The circuit provided by the utility model solves a problem of inconsistency of all branch circuits in an LED array through the dimming function. Meanwhile, the collection and feedback actions of the excess energy of the circuit can be used for achieving the high-efficiency driving of the LED array. The circuit is suitable for the driving system of any LED array (regular or irregular).
Description
Technical field
The utility model relates to DC-to-DC (DC-DC) interface circuit of the many outputs of single input, is applied to rule or irregular LED array drive system, especially a kind of LED array interface circuit that contains three winding coupled inductance.
Background technology
LED(light-emitting diode) be a kind of solid semiconductor device that can convert electric energy to luminous energy.In high-power illumination application, modal is the form work of multiple series-parallel LED with array.Because of array structure, device manufacture and the reason such as aging, even the LED of same size in regular array also exists the problem of inconsistency between individuality.Therefore, the LED array drive system of superior performance should overcome the problem of inconsistency existing in rule or irregular LED array, realizes again higher LED array drive efficiency.At present, the low cost LED array drive system scheme generally adopting is that the multiple inputs of adjustable direct voltage source cascade linearity in parallel is adjusted constant-current circuit.In the scheme of " the multiple inputs of adjustable direct voltage source cascade linearity in parallel is adjusted constant-current circuit ", the branch road that the output voltage of adjustable direct voltage source is followed conduction voltage drop maximum in LED array changes, although can meet the needs that whole LED array drives, it is minimum that the branch road that only can guarantee conduction voltage drop maximum in LED array is realized loss.In the time that the conduction voltage drop of each branch road in LED array exists larger difference, especially, in the time that LED array is irregular, the scheme of being somebody's turn to do " the multiple inputs of adjustable direct voltage source cascade linearity in parallel is adjusted constant-current circuit " cannot realize high efficiency.
Summary of the invention
The deficiency of the scheme of existing for overcoming " the multiple inputs of adjustable direct voltage source cascade linearity in parallel is adjusted constant-current circuit ", the utility model provides a kind of LED array interface circuit that contains three winding coupled inductance, and object is to improve the drive efficiency of any LED array (rule or irregular).
The utility model solves the technical scheme that its technical problem adopts: a kind of LED array interface circuit that contains three winding coupled inductance by n channel circuit (channel circuit 1 to channel circuit n) and 1 multi channel currents controller with dimming function form.
Described channel circuit j(j=1, n) by input capacitance Cij, inductance L j, N-MOS is responsible for Mj, three winding coupled inductance L aj and Lbj and Lcj, booster diode Daj, booster diode Dbj, booster diode Dcj, N-MOS auxiliary tube Maj, TVS manages TVSj, output capacitance Coj forms, it is characterized in that: one end of the anode of direct voltage source Vi and input capacitance Cij, one end of inductance L j, one end (being different name end relation with one end of described three winding coupled inductance L bj) of one end of three winding coupled inductance L bj and three winding coupled inductance L cj is connected, the drain electrode of the other end of inductance L j and N-MOS pipe Mj, the negative electrode of one end (being different name end relation with one end of described three winding coupled inductance L bj) of three winding coupled inductance L aj and TVS pipe TVSj is connected, the other end of three winding coupled inductance L aj is connected with the anode of booster diode Daj, the negative electrode of booster diode Daj is connected with the drain electrode of N-MOS auxiliary tube Maj, the source electrode of the source electrode of N-MOS auxiliary tube Maj and N-MOS supervisor Mj, the anode of TVS pipe TVSj, one end of output capacitance Coj, the anode of the anode of output voltage V oj and LED string j is connected, the LED string negative electrode of j and the negative terminal of direct voltage source Vi, the anode of booster diode Dbj, the anode of booster diode Dcj, the other end of input capacitance Cij, the negative terminal of the other end of output capacitance Coj and output voltage V oj is connected, the negative electrode of booster diode Dbj is connected with the other end (being different name end relation with the other end of described three winding coupled inductance L aj) of three winding coupled inductance L bj, the negative electrode of booster diode Dcj is connected with the other end (being Same Name of Ends relation with the other end of described three winding coupled inductance L aj) of three winding coupled inductance L cj, the contact of the contact of three winding coupled inductance L cj and booster diode Dcj and three winding coupled inductance L aj and booster diode Daj is Same Name of Ends relation, the contact of the contact of three winding coupled inductance L bj and booster diode Dbj and three winding coupled inductance L aj and booster diode Daj is different name end relation.
Because inductance L j and the parallel branch being made up of output capacitance Coj and LED string j and the combined finger being made up of N-MOS supervisor Mj, three winding coupled inductance L aj, booster diode Daj, N-MOS auxiliary tube Maj, TVS pipe TVSj are series relationship, so above-mentioned three's position can exchange.
Described channel circuit j(j=1, n) be also connected with the described multi channel currents controller (being called for short: current controller) with dimming function, described current controller has port vc, port vs, port vgj, port vsj, port vgaj, port vsenj, port vpj, it is characterized in that: the anode of direct voltage source Vi is connected with the port vc of described current controller, the negative terminal of direct voltage source Vi is connected with the port vs of described current controller, N-MOS supervisor's gate pole of Mj and the port vgj of described current controller are connected, N-MOS supervisor's source electrode of Mj and the source electrode of N-MOS auxiliary tube Maj are all connected with the port vsj of described current controller, the gate pole of N-MOS auxiliary tube Maj is connected with the port vgaj of described current controller, the port vsenj of described current controller receives the detection signal of the operating current ioj of LED string j, the port vpj of described current controller receives outside PWM dim signal.
Further, the described multi channel currents controller with dimming function comprises accessory power supply unit, current control unit, PWM light modulation unit and metal-oxide-semiconductor driver element, it is characterized in that: described accessory power supply unit can convert described current control unit, described PWM light modulation unit and the required supply voltage of described metal-oxide-semiconductor driver element work to direct voltage source Vi
Described current control unit can be gone here and there j(j=1 according to LED ..., the detection signal vsenj output N-MOS supervisor control signal vgcj of non-modulated of Mj and the control signal vacj of the non-modulated of N-MOS auxiliary tube Maj of operating current ioj n),
Described PWM light modulation unit can be according to outside PWM dim signal vpj and the N-MOS supervisor control signal vgcj of non-modulated of Mj and the control signal vacj of the non-modulated of the N-MOS auxiliary tube Maj output N-MOS supervisor modulator control signal vgpj of Mj and the modulator control signal vapj of N-MOS auxiliary tube Maj
Described metal-oxide-semiconductor driver element N-MOS can be responsible for to the modulator control signal vgpj of Mj and the modulator control signal vapj of N-MOS auxiliary tube Maj converts to by port vgj, the port vsj of the described multi channel currents controller with dimming function and the differential driving signal of port vgaj output.
Further, the current control unit of the described multi channel currents controller with dimming function comprises amplifier 1j(j=1, n), amplifier 2j, subtracter j, reference voltage source j, triangular-wave generator j, comparator j, inverter j, it is characterized in that: the input of described amplifier 1j is connected with the port vsenj of the described multi channel currents controller with dimming function, the output of amplifier 1j is connected with the positive input terminal of subtracter j, the output of reference voltage source j is connected with the negative input end of subtracter j, the output of subtracter j is connected with the input of amplifier 2j, the output of amplifier 2j is connected with the inverting input of comparator j, the output of triangular-wave generator j is connected with the normal phase input end of comparator j, comparator j exports the control signal vgcj of the non-modulated of described N-MOS supervisor Mj, the output of comparator j is connected with the input of inverter j, inverter j exports the control signal vacj of the non-modulated of described N-MOS auxiliary tube Maj.
The PWM light modulation unit of the described multi channel currents controller with dimming function comprises AND circuit 1j(j=1, n) with AND circuit 2j, it is characterized in that: an input of described AND circuit 1j receives the control signal vgcj of the non-modulated of described N-MOS supervisor Mj, an input of described AND circuit 2j receives the control signal vacj of the non-modulated of described N-MOS auxiliary tube Maj, another input of AND circuit 1j and another input of AND circuit 2j and described in there is the multi channel currents controller of dimming function port vpj be connected, AND circuit 1j exports the modulator control signal vgpj of described N-MOS supervisor Mj, AND circuit 2j exports the modulator control signal vapj of described N-MOS auxiliary tube Maj.
Technical conceive of the present utility model is: in regular and irregular LED array drive system, adopt the LED array interface circuit containing three winding coupled inductance, LED array interface circuit containing three winding coupled inductance is positioned between (non-adjustable) direct voltage source and LED array, utilize the regulating action of the LED array interface circuit that contains three winding coupled inductance to solve the problem of inconsistency of each branch road in LED array, recycling is collected containing the excess energy of the LED array interface circuit of three winding coupled inductance and feedback effect realizes high efficiency LED array driving.
The beneficial effects of the utility model are mainly manifested in: the LED array interface circuit containing three winding coupled inductance can provide high efficiency driving for any LED array (rule or irregular), and circuit is simple, the control of LED drive current is accurate, LED dimming scope is wide.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment.
Fig. 2 is the functional block diagram of the multi channel currents controller with dimming function of the utility model embodiment.
Fig. 3 is the circuit diagram of the current control unit of the multi channel currents controller with dimming function of the utility model embodiment.
Fig. 4 is the circuit diagram of the PWM light modulation unit of the multi channel currents controller with dimming function of the utility model embodiment.
Fig. 5 is the utility model embodiment inductance L j(j=1 under non-dimming state ..., n) the ideal operation oscillogram in current continuity state and three winding coupled inductance L aj and Lbj and Lcj channel circuit j during in discontinuous current state.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Embodiment
With reference to figure 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, embodiment is made up of to channel circuit n and the multi channel currents controller with dimming function channel circuit 1.
As shown in Figure 1, the channel circuit j(j=1 of embodiment,, n) formed by input capacitance Cij, inductance L j, N-MOS supervisor Mj, three winding coupled inductance L aj and Lbj and Lcj, booster diode Daj, booster diode Dbj, booster diode Dcj, N-MOS auxiliary tube Maj, TVS pipe TVSj, output capacitance Coj.One end of the anode of direct voltage source Vi and input capacitance Cij, one end of inductance L j, one end (being different name end relation with one end of described three winding coupled inductance L bj) of one end of three winding coupled inductance L bj and three winding coupled inductance L cj is connected, the drain electrode of the other end of inductance L j and N-MOS pipe Mj, the negative electrode of one end (being different name end relation with one end of described three winding coupled inductance L bj) of three winding coupled inductance L aj and TVS pipe TVSj is connected, the other end of three winding coupled inductance L aj is connected with the anode of booster diode Daj, the negative electrode of booster diode Daj is connected with the drain electrode of N-MOS auxiliary tube Maj, the source electrode of the source electrode of N-MOS auxiliary tube Maj and N-MOS supervisor Mj, the anode of TVS pipe TVSj, one end of output capacitance Coj, the anode of the anode of output voltage V oj and LED string j is connected, the LED string negative electrode of j and the negative terminal of direct voltage source Vi, the anode of booster diode Dbj, the anode of booster diode Dcj, the other end of input capacitance Cij, the negative terminal of the other end of output capacitance Coj and output voltage V oj is connected, the negative electrode of booster diode Dbj is connected with the other end (being different name end relation with the other end of described three winding coupled inductance L aj) of three winding coupled inductance L bj, the negative electrode of booster diode Dcj is connected with the other end (being Same Name of Ends relation with the other end of described three winding coupled inductance L aj) of three winding coupled inductance L cj, the contact of the contact of three winding coupled inductance L cj and booster diode Dcj and three winding coupled inductance L aj and booster diode Daj is Same Name of Ends relation, the contact of the contact of three winding coupled inductance L bj and booster diode Dbj and three winding coupled inductance L aj and booster diode Daj is different name end relation.
As shown in Figure 1, the channel circuit j(j=1 of embodiment, n) be connected with the multi channel currents controller with dimming function (being called for short: current controller) of embodiment, the current controller of embodiment has port vc, port vs, port vgj, port vsj, port vgaj, port vsenj, port vpj, the anode of direct voltage source Vi is connected with the port vc of current controller, the negative terminal of direct voltage source Vi is connected with the port vs of current controller, N-MOS supervisor's gate pole of Mj and the port vgj of current controller are connected, N-MOS supervisor's source electrode of Mj and the source electrode of N-MOS auxiliary tube Maj are all connected with the port vsj of current controller, the gate pole of N-MOS auxiliary tube Maj is connected with the port vgaj of current controller, the port vsenj of current controller receives the detection signal of the operating current ioj of LED string j, the port vpj of current controller receives outside PWM dim signal.
As shown in Figure 2, the multi channel currents controller with dimming function of embodiment comprises accessory power supply unit, current control unit, PWM light modulation unit and metal-oxide-semiconductor driver element.The accessory power supply unit of embodiment can convert direct voltage source Vi to current control unit, PWM light modulation unit and the required supply voltage of metal-oxide-semiconductor driver element work of embodiment.The current control unit of embodiment can be gone here and there j(j=1 according to LED ..., the detection signal vsenj output N-MOS supervisor control signal vgcj of non-modulated of Mj and the control signal vacj of the non-modulated of N-MOS auxiliary tube Maj of operating current ioj n).The PWM light modulation unit of embodiment can be according to outside PWM dim signal vpj and the N-MOS supervisor control signal vgcj of non-modulated of Mj and the control signal vacj of the non-modulated of the N-MOS auxiliary tube Maj output N-MOS supervisor modulator control signal vgpj of Mj and the modulator control signal vapj of N-MOS auxiliary tube Maj.The metal-oxide-semiconductor driver element of embodiment N-MOS can be responsible for to the modulator control signal vgpj of Mj and the modulator control signal vapj of N-MOS auxiliary tube Maj converts port vgj, the port vsj of the multi channel currents controller with dimming function and the differential driving signal of port vgaj output by embodiment to.
As shown in Figure 3, the current control unit of the multi channel currents controller with dimming function of embodiment comprises amplifier 1j(j=1 ..., n), amplifier 2j, subtracter j, reference voltage source j, triangular-wave generator j, comparator j, inverter j.The input of amplifier 1j is connected with the port vsenj of the multi channel currents controller with dimming function of embodiment, the output of amplifier 1j is connected with the positive input terminal of subtracter j, the output of reference voltage source j is connected with the negative input end of subtracter j, the output of subtracter j is connected with the input of amplifier 2j, the output of amplifier 2j is connected with the inverting input of comparator j, the output of triangular-wave generator j is connected with the normal phase input end of comparator j, the control signal vgcj of the non-modulated of comparator j output N-MOS pipe Mj, the output of comparator j is connected with the input of inverter j, the control signal vacj of the non-modulated of inverter j output N-MOS auxiliary tube Maj.
As shown in Figure 4, the PWM light modulation unit of the multi channel currents controller with dimming function of embodiment comprises AND circuit 1j(j=1 ..., n) with AND circuit 2j.An input of AND circuit 1j receives the control signal vgcj of the non-modulated of N-MOS supervisor Mj, an input of AND circuit 2j receives the control signal vacj of the non-modulated of N-MOS auxiliary tube Maj, another input of AND circuit 1j is connected with the port vpj of the multi channel currents controller with dimming function of another input of AND circuit 2j and embodiment, the modulator control signal vgpj of AND circuit 1j output N-MOS supervisor Mj, the modulator control signal vapj of AND circuit 2j output N-MOS auxiliary tube Maj.
Fig. 5 is that embodiment is at the lower inductance L j(j=1 of non-dimming state (outside PWM dim signal vpj is high level),, n) the ideal operation oscillogram in current continuity state and three winding coupled inductance L aj and Lbj and Lcj channel circuit j during in discontinuous current state.
At the lower inductance L j(j=1 of non-dimming state (outside PWM dim signal vpj is high level), n), in current continuity state and three winding coupled inductance L aj and Lbj and Lcj during in discontinuous current state, the steady operation process of the channel circuit j of embodiment comprises following 2 stages.
Stage 1:N-MOS is responsible for Mj(j=1 ..., n) conducting, N-MOS auxiliary tube Maj turn-offs (the current i Laj=0 of three winding coupled inductance L aj).Direct voltage source Vi, input capacitance Cij, inductance L j, N-MOS supervisor Mj, output capacitance Coj and LED string j form a loop.Now, the voltage vLj ≈ Vi-Voj>0 at inductance L j two ends, inductance L j charging, makes current i Lj and current i Mj all increase.Booster diode Dcj cut-off, booster diode Daj cut-off, booster diode Dbj conducting, booster diode Dbj, three winding coupled inductance L bj, direct voltage source Vi form another loop.Now, three winding coupled inductance L bj electric discharges, current i Lbj reduces until be zero, the magnetic energy of preservation all to be fed back to direct voltage source Vi.
Stage 2:N-MOS is responsible for Mj(j=1 ..., n) turn-off (the current i Mj=0 of N-MOS supervisor Mj), N-MOS auxiliary tube Maj conducting.Booster diode Daj conducting, direct voltage source Vi, input capacitance Cij, inductance L j, three winding coupled inductance L aj, booster diode Daj, N-MOS auxiliary tube Maj, output capacitance Coj and LED string j form a loop.Meanwhile, booster diode Dbj cut-off, booster diode Dcj conducting, booster diode Dcj, three winding coupled inductance L cj, direct voltage source Vi form another loop.Now, voltage vLj ≈ (1-k) × Vi – Voj<0 at inductance L j two ends, k is the turn ratio between three winding coupled inductance L aj and Lcj, inductance L j electric discharge, makes current i Lj and current i Laj all reduce; Three winding coupled inductance L aj are converted into a part for unnecessary electric energy in channel circuit j magnetic energy and preserve, and in channel circuit j, another part of unnecessary electric energy directly feeds back to direct voltage source Vi by three winding coupled inductance L cj.
Under non-dimming state (outside PWM dim signal vpj is high level), as direct voltage source Vi or LED string j(j=1 ..., while n) changing, operating current ioj and the detection signal vsenj thereof of LED string j also can change thereupon.In the time that the operating current ioj of LED string j and detection signal vsenj thereof become large, the current control unit of the multi channel currents controller with dimming function of embodiment can shorten the control signal vgcj(j=1 of the non-modulated of N-MOS supervisor Mj, n) high level time, the reducing of operating current ioj of realizing LED string j by reducing the current i Lj of inductance L j.In the time that the operating current ioj of LED string j and detection signal vsenj thereof diminish, the current control unit of the multi channel currents controller with dimming function of embodiment can extend the control signal vgcj(j=1 of the non-modulated of N-MOS supervisor Mj, n) high level time, realizes the increase of the operating current ioj of LED string j by increasing the current i Lj of inductance L j.
Under dimming state (outside PWM dim signal vpj is pulse signal), the control signal vgcj(j=1 of the non-modulated of the PWM light modulation unit of the multi channel currents controller with dimming function of embodiment to N-MOS supervisor Mj,, n) and the control signal vacj of the non-modulated of N-MOS auxiliary tube Maj modulate.In the time that outside PWM dim signal vpj is low level, the modulator control signal vgpj(j=1 of N-MOS supervisor Mj, n) be low level with the modulator control signal vapj of N-MOS auxiliary tube Maj, the multi channel currents controller with dimming function of embodiment directly turn-offs N-MOS supervisor Mj and N-MOS auxiliary tube Maj.In the time that outside PWM dim signal vpj is high level, the modulator control signal vgpj(j=1 of N-MOS supervisor Mj, n) and the control signal vgcj of the non-modulated of N-MOS supervisor Mj be consistent, the control signal vacj of the non-modulated of the modulator control signal vapj of N-MOS auxiliary tube Maj and N-MOS auxiliary tube Maj is consistent, and N-MOS supervisor Mj now and the operating state of N-MOS auxiliary tube Maj are all consistent with the operating state under non-dimming state.In the time that N-MOS supervisor Mj and N-MOS auxiliary tube Maj all turn-off, TVS pipe TVSj works, for inductance L j provides necessary current channel, to prevent overvoltage.
Booster diode Daj, booster diode Dbj, booster diode Dcj in the effect containing in the LED array interface circuit of three winding coupled inductance are: limit three winding coupled inductance L aj and the current i Laj of Lbj and Lcj and the direction of iLbj and iLcj, prevent that circulation from appearring in circuit, guarantee circuit high-efficiency operation.
Content described in this specification embodiment is only enumerating of way of realization to utility model design; protection range of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection range of the present utility model is also and conceive the equivalent technologies means that can expect according to the utility model in those skilled in the art.
Claims (5)
1. the LED array interface circuit containing three winding coupled inductance, it is characterized in that: the described LED array interface circuit that contains three winding coupled inductance is by n channel circuit, channel circuit 1 is to channel circuit n, and 1 multi channel currents controller with dimming function forms, described channel circuit j, j=1, n, by input capacitance Cij, inductance L j, N-MOS is responsible for Mj, three winding coupled inductance L aj and Lbj and Lcj, booster diode Daj, booster diode Dbj, booster diode Dcj, N-MOS auxiliary tube Maj, TVS manages TVSj, output capacitance Coj forms, one end of the anode of direct voltage source Vi and input capacitance Cij, one end of inductance L j, one end of one end of three winding coupled inductance L bj and three winding coupled inductance L cj is connected, one end of one end of described three winding coupled inductance L cj and described three winding coupled inductance L bj is different name end relation, the drain electrode of the other end of inductance L j and N-MOS pipe Mj, the negative electrode of one end of three winding coupled inductance L aj and TVS pipe TVSj is connected, one end of one end of described three winding coupled inductance L aj and described three winding coupled inductance L bj is different name end relation, the other end of three winding coupled inductance L aj is connected with the anode of booster diode Daj, the negative electrode of booster diode Daj is connected with the drain electrode of N-MOS auxiliary tube Maj, the source electrode of the source electrode of N-MOS auxiliary tube Maj and N-MOS supervisor Mj, the anode of TVS pipe TVSj, one end of output capacitance Coj, the anode of the anode of output voltage V oj and LED string j is connected, the LED string negative electrode of j and the negative terminal of direct voltage source Vi, the anode of booster diode Dbj, the anode of booster diode Dcj, the other end of input capacitance Cij, the negative terminal of the other end of output capacitance Coj and output voltage V oj is connected, the negative electrode of booster diode Dbj is connected with the other end of three winding coupled inductance L bj, the other end of the other end of described three winding coupled inductance L bj and described three winding coupled inductance L aj is different name end relation, the negative electrode of booster diode Dcj is connected with the other end of three winding coupled inductance L cj, the other end of the other end of described three winding coupled inductance L cj and described three winding coupled inductance L aj is Same Name of Ends relation, the contact of the contact of three winding coupled inductance L cj and booster diode Dcj and three winding coupled inductance L aj and booster diode Daj is Same Name of Ends relation, the contact of the contact of three winding coupled inductance L bj and booster diode Dbj and three winding coupled inductance L aj and booster diode Daj is different name end relation,
Because inductance L j and the parallel branch being made up of output capacitance Coj and LED string j and the combined finger being made up of N-MOS supervisor Mj, three winding coupled inductance L aj, booster diode Daj, N-MOS auxiliary tube Maj, TVS pipe TVSj are series relationship, so above-mentioned three's position can exchange
Described channel circuit j, j=1, n, also be connected with the described multi channel currents controller with dimming function, the described multi channel currents controller with dimming function has port vc, port vs, port vgj, port vsj, port vgaj, port vsenj, port vpj, the anode of described direct voltage source Vi is connected with the port vc of the described multi channel currents controller with dimming function, the negative terminal of described direct voltage source Vi is connected with the port vs of the described multi channel currents controller with dimming function, the gate pole of described N-MOS supervisor Mj is connected with the port vgj of the described multi channel currents controller with dimming function, described N-MOS supervisor's source electrode of Mj and the source electrode of described N-MOS auxiliary tube Maj are all connected with the port vsj of the described multi channel currents controller with dimming function, the gate pole of described N-MOS auxiliary tube Maj is connected with the port vgaj of the described multi channel currents controller with dimming function, the port vsenj of the described multi channel currents controller with dimming function receives the detection signal of the operating current ioj of described LED string j, the port vpj of the described multi channel currents controller with dimming function receives outside PWM dim signal.
2. the LED array interface circuit that contains three winding coupled inductance as claimed in claim 1, it is characterized in that: described channel circuit j, j=1, n, in inductance L j and parallel branch form by output capacitance Coj and LED string j and can be exchanged by the position that N-MOS supervisor Mj, three winding coupled inductance L aj, booster diode Daj, N-MOS auxiliary tube Maj, TVS manage the combined finger that TVSj forms.
3. the LED array interface circuit containing three winding coupled inductance as described in one of claim 1 and 2, it is characterized in that: described in there is dimming function multi channel currents controller comprise accessory power supply unit, current control unit, PWM light modulation unit and metal-oxide-semiconductor driver element
Described accessory power supply unit can convert described current control unit, described PWM light modulation unit and the required supply voltage of described metal-oxide-semiconductor driver element work to described direct voltage source Vi,
Described current control unit can be according to described LED string j, j=1 ..., n, the detection signal of operating current ioj export the described N-MOS supervisor control signal vgcj of non-modulated of Mj and the control signal vacj of the non-modulated of described N-MOS auxiliary tube Maj,
Described PWM light modulation unit can according to the PWM dim signal vpj of described outside and described N-MOS be responsible for the control signal vgcj of non-modulated of Mj and the control signal vacj of the non-modulated of described N-MOS auxiliary tube Maj exports the described N-MOS supervisor modulator control signal vgpj of Mj and the modulator control signal vapj of described N-MOS auxiliary tube Maj
Described metal-oxide-semiconductor driver element can convert the described N-MOS supervisor modulator control signal vgpj of Mj and the modulator control signal vapj of described N-MOS auxiliary tube Maj by port vgj, the port vsj of the described multi channel currents controller with dimming function and the differential driving signal of port vgaj output to.
4. the LED array interface circuit that contains three winding coupled inductance as claimed in claim 3, it is characterized in that: described in there is the multi channel currents controller of dimming function current control unit comprise amplifier 1j, j=1, n, , amplifier 2j, subtracter j, reference voltage source j, triangular-wave generator j, comparator j, inverter j, the input of described amplifier 1j is connected with the port vsenj of the described multi channel currents controller with dimming function, the output of described amplifier 1j is connected with the positive input terminal of described subtracter j, the output of described reference voltage source j is connected with the negative input end of described subtracter j, the output of described subtracter j is connected with the input of described amplifier 2j, the output of described amplifier 2j is connected with the inverting input of described comparator j, the output of described triangular-wave generator j is connected with the normal phase input end of described comparator j, described comparator j exports the control signal vgcj of the non-modulated of described N-MOS supervisor Mj, the output of described comparator j is connected with the input of described inverter j, described inverter j exports the control signal vacj of the non-modulated of described N-MOS auxiliary tube Maj.
5. the LED array interface circuit that contains three winding coupled inductance as claimed in claim 3, it is characterized in that: described in there is the multi channel currents controller of dimming function PWM light modulation unit comprise AND circuit 1j, j=1, n, with AND circuit 2j, an input of described AND circuit 1j receives the control signal vgcj of the non-modulated of described N-MOS supervisor Mj, an input of described AND circuit 2j receives the control signal vacj of the non-modulated of described N-MOS auxiliary tube Maj, another input of described AND circuit 1j and another input of described AND circuit 2j and described in there is the multi channel currents controller of dimming function port vpj be connected, described AND circuit 1j exports the modulator control signal vgpj of described N-MOS supervisor Mj, described AND circuit 2j exports the modulator control signal vapj of described N-MOS auxiliary tube Maj.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320530675.8U CN203596744U (en) | 2013-08-28 | 2013-08-28 | LED array interface circuit comprising three-winding coupling inductor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320530675.8U CN203596744U (en) | 2013-08-28 | 2013-08-28 | LED array interface circuit comprising three-winding coupling inductor |
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| Publication Number | Publication Date |
|---|---|
| CN203596744U true CN203596744U (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320530675.8U Expired - Lifetime CN203596744U (en) | 2013-08-28 | 2013-08-28 | LED array interface circuit comprising three-winding coupling inductor |
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| CN (1) | CN203596744U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793317A (en) * | 2016-12-30 | 2017-05-31 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN111465149A (en) * | 2019-01-18 | 2020-07-28 | 英飞凌科技股份有限公司 | Power splitting for linear current sources |
-
2013
- 2013-08-28 CN CN201320530675.8U patent/CN203596744U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793317A (en) * | 2016-12-30 | 2017-05-31 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN106793317B (en) * | 2016-12-30 | 2018-12-14 | 杰华特微电子（杭州）有限公司 | Light adjusting circuit, light-dimming method and LED drive circuit |
| CN111465149A (en) * | 2019-01-18 | 2020-07-28 | 英飞凌科技股份有限公司 | Power splitting for linear current sources |
| CN111465149B (en) * | 2019-01-18 | 2023-10-13 | 英飞凌科技股份有限公司 | Power splitting for linear current sources |
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