CN104253955B - Low-power-consumption constant-current and voltage-stabilizing control circuit and television - Google Patents
Low-power-consumption constant-current and voltage-stabilizing control circuit and television Download PDFInfo
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Abstract
The invention discloses a low-power consumption constant current and voltage stabilization control circuit, which comprises: the DC-DC voltage regulation circuit comprises a front-end power supply circuit, a DC-DC voltage regulation circuit and a rear-end linear constant-current circuit; the front-end power supply circuit comprises a power supply circuit, a first power supply output end, a second power supply output end and a feedback circuit; the feedback circuit outputs a feedback signal to the power supply circuit according to the voltage value of the control signal input end so as to control the power supply circuit to adjust the voltage values of the first power supply output end and the second power supply output end; the DC-DC voltage regulating circuit regulates the voltage signal output by the second power supply output end into a fixed voltage signal; the low-power-consumption constant current and voltage stabilizing control circuit can adjust the voltage value of the control signal input end according to the voltage change of the LED lamp string to be powered, thereby controlling the output voltages of the first power supply output end and the second power supply output end.
Description
Technical field
The present invention relates to power supply technical field, more particularly to a kind of constant current of low-power consumption and controlling circuit of voltage regulation and bag
Include the television set of the constant current of the low-power consumption and the adaptation power supply regulation of controlling circuit of voltage regulation.
Background technology
Linear constant-current modulation circuit is widely used a kind of element circuit in Analogous Integrated Electronic Circuits, there is wide in practice
General application.Wherein, in the power supply technical field of LED television, front-end circuit output constant pressure, rear end electricity are often utilized
Realize boosting or decompression constant current to realize the power supply to mainboard and LED backlight in road.
In television components are carried out with integration process, mainboard and backlight lamp bar usually require to form a complete production network, and quantity is not
Same backlight LED light bars will need linear constant-current modulation circuit adaptability to export different magnitudes of voltage.One is used in the prior art
Powered the backfeed loop that output end is connected, the voltage change of timely monitoring television main board power supply output end with TV SKD.
As shown in figure 1, being a kind of schematic diagram for linear constant-current modulation circuit that prior art is provided, pass through power circuit 10
LED power supply signals and main board power supply signal are provided.When the output voltage rise of main board power supply output end, pass through resistance RB135
Be linked into the voltage signal after resistance RB134 partial pressures in voltage-stabiliser tube UB102 reference input R0, and by the voltage signal with
Reference voltage (such as 2.5V) inside voltage-stabiliser tube UB102 is made comparisons so that voltage drop between voltage-stabiliser tube UB102 anode and cathodes
Low, and then optocoupler diode PCB101A electric current becomes big, the dynamic electric resistor between colelctor electrode and emitter stage diminishes, colelctor electrode with
Voltage step-down between emitter stage；The variable quantity of voltage signal is fed back in power circuit 10 by output terminals A DJ/Vs-ON
Internal transformer；The internal transformer output voltage in power circuit 10 is reduced to the voltage of setting therewith.Therefore, with electricity
Hinder the increase of RB134 resistances, the power output voltages of output end and main board power supply output end of LED reduce, otherwise voltage rise.
Due to the difference of application scenario, linear constant current circuit is generally required in actual production process and exports different voltages
Value, and prior art in order to meet different occasion needs, it is necessary to the resistance to the resistance RB134 in hardware circuit be adjusted or
Change resistance RB134.Therefore, there is the defect that trivial operations, precision are low, power consumption is high and cost is high in the technical scheme.In addition, by
The magnitude of voltage synchronously change, varying number LED light bar for output end and the main board power supply output end of being powered in the LED of linear constant current circuit
Required supply voltage is simultaneously differed, and the supply voltage of TV SKD is relatively fixed, and therefore, prior art can not be met
Adjustment LED power output end output voltage values while, adaptively keep supply TV SKD voltage stabilization need
Ask.
The content of the invention
The technical problems to be solved by the invention are to provide constant current and the controlling circuit of voltage regulation of a kind of low-power consumption, adaptively
Ground adjustment LED powers the magnitude of voltage of output end and the magnitude of voltage of stable supplying mainboard, without being adjusted to hardware circuit.
To solve above technical problem, on the one hand, the present invention provides constant current and the controlling circuit of voltage regulation of a kind of low-power consumption, bag
Include：Front end power circuit, DC-DC voltage regulator circuits and rear end linear constant current circuit；
The front end power circuit includes power supply circuit, the first power supply output end, the second power supply output end and feedback circuit；
The feedback circuit includes feedback input end, control signal input and feedback signal output；The feedback is defeated
Enter end to be connected with the described second power supply output end, the feedback signal output is connected with the power supply circuit；The feedback electricity
Road is according to the magnitude of voltage of the control signal input, to the power supply circuit output feedback signal, to control the power supply electricity
Road is adjusted to the magnitude of voltage of the described first power supply output end and the second power supply output end；
The input of the DC-DC voltage regulator circuits is connected with the described second power supply output end, for by described second
The voltage signal that power supply output end is exported is adjusted to after fixed voltage signal, and output to mainboard is powered；
The rear end linear constant current circuit includes comparison circuit and constant-current control circuit；The comparison circuit is provided with reference to letter
Number input, to access constant current reference voltage；The constant-current control circuit under the regulation of the comparison circuit with LED to be powered
One end connection of lamp string, the other end of the LED string to be powered is connected with the described first power supply output end；
Voltage acquisition output end all the way is drawn with the LED string junction to be powered in the constant-current control circuit, with
According to the voltage change of the LED string to be powered, adjust the magnitude of voltage of the control signal input, thus control it is described before
Hold power circuit adjustment the first power supply output end, the output voltage of the second power supply output end.
Further, the constant current of described low-power consumption also includes a control master chip with controlling circuit of voltage regulation；
The control master chip and the control signal input, the reference signal input and the voltage acquisition
Output end is connected respectively；
The control master chip adjusts the output to the control signal according to the voltage change of the voltage acquisition output end
The signal magnitude of input, the output for output end, the second power supply output end of being powered with control the front end power circuit first
Magnitude of voltage；And the constant current reference voltage is inputted to the rear end linear constant current circuit by the reference signal input.
Further, when the control master chip detects the voltage acquisition output end and the reference signal input
Voltage difference be more than default threshold value when, the control master chip will export to the control signal input voltage signal
Dutycycle reduces.
Further, the control master chip includes analog-digital converter, for the voltage for accessing the control master chip
Signal is converted to data signal.
Preferably, the power supply circuit includes power supply input circuit, switching power circuit, multiple-channel output transformer, LED confessions
Electricity output circuit and main board power supply output circuit；
The power supply input circuit transmits the power supply signal of access to described under the control of the switching power circuit
Multiple-channel output transformer；
The multiple-channel output transformer includes main winding and auxiliary winding；The main winding will be passed after the power supply signal transformation
The main board power supply output circuit is transported to, and is exported by the described second power supply output end；The auxiliary winding is by the electricity
Transmit to the LED and power output circuit after source signal synchronization transformation, and exported by the described first power supply output end；Institute
The coil ratio for stating main winding and the auxiliary winding is 1：N, N ＞ 0.
Preferably, in the front end power circuit, the feedback circuit is additionally provided with optocoupler (PCB101), voltage-stablizer
(UB102)；
The optocoupler (PCB101) includes the light emitting diode and the optical signal converter positioned at secondary positioned at primary side；
The control signal that the control signal input is inputted is accessed to the optocoupler by the voltage-stablizer (UB102)
(PCB101) the light emitting diode positioned at primary side；Control signal is converted to and institute is transferred to after optical signal by the light emitting diode
State the optical signal converter positioned at secondary of optocoupler (PCB101)；The optical signal converter is converted optical signals to after electric signal
Export to the feedback signal output.
Preferably, the voltage-stablizer (UB102) uses adjustable precision shunt voltage-stablizer, including negative electrode (K), anode (A)
With reference input (R), and interior reference voltage is had；
Wherein, anode (A) ground connection of the adjustable precision shunt voltage-stablizer, negative electrode (K) and the optocoupler (PCB101)
Positioned at primary side light emitting diode connect；Reference input (R) is used for the control signal for accessing the control signal input.
Further, the feedback circuit is additionally provided with voltage stabilizing feedback circuit.
On the other hand, present invention also offers a kind of television set of adaptation power supply regulation, including：TV SKD, the back of the body
Light LED string, and low-power consumption described in any of the above constant current and controlling circuit of voltage regulation；
The constant current of the low-power consumption connects respectively with controlling circuit of voltage regulation with the TV SKD and the backlight LED light string
Connect, for the operating voltage according to the backlight LED light string by incoming control signal, automatic adjusument supplies the backlight
The voltage signal of LED string, and stablize output to the supply voltage signal of the TV SKD.
Implement the present invention and technical scheme is provided, by setting power supply electricity in front end in linear constant current and controlling circuit of voltage regulation
Road, DC-DC voltage regulator circuits and rear end linear constant current circuit, the power supply electricity of two-way output is adjusted using front end power circuit
Pressure, and set up in the power circuit of front end feedback circuit, and be provided with control signal input in a feedback circuit, to realize pair
The voltage of first power supply output end of front end power circuit and the second power supply output end is automatically controlled.Due to control signal input
The voltage signal at end will influence the output voltage of the first power supply output end and the second output end simultaneously, therefore the present invention is further
Ensure output to the stabilization of the voltage signal of mainboard by DC-DC voltage regulator circuits；And by setting up rear end linear constant current
Circuit adapts to the change of the LED backlight quantity of series connection automatically, and the magnitude of voltage adjustment after being connected according to LED backlight is described
The magnitude of voltage of control signal input, so as to control first power supply to export by front end power circuit and its feedback circuit
End, the output voltage of the second power supply output end, and the first power supply output end is connected to LED backlight and is powered, realize with
The adaptable voltage automation regulation of LED backlight quantity, reduces the power consumption of circuit switch element, and ensure that motherboard circuit
The stability of supply voltage.Further, in technical field of television sets, it is possible to use the constant current of the low-power consumption and voltage stabilizing control
Circuit processed is controlled to TV SKD, backlight LED light string, realizes a kind of television set of adaptation power supply regulation.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram for linear constant-current modulation circuit that prior art is provided.
Fig. 2 is the structural representation of one embodiment of the constant current of low-power consumption that the present invention is provided and controlling circuit of voltage regulation.
Fig. 3 is a kind of schematic diagram of the achievable mode for the front end power circuit that the present invention is provided.
Fig. 4 is a kind of physical circuit schematic diagram for the front end power circuit that the present invention is provided.
Fig. 5 is a kind of circuit theory diagrams when the DC-DC voltage regulator circuits that the present invention is provided are liter voltage regulator circuit.
Fig. 6 is a kind of circuit theory diagrams of the achievable mode for the rear end linear constant current circuit that the present invention is provided.
Fig. 7 is the structural representation of the another embodiment of the constant current of low-power consumption that the present invention is provided and controlling circuit of voltage regulation.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described.
It is that the constant current for the low-power consumption that the present invention is provided and the structure of one embodiment of controlling circuit of voltage regulation are shown referring to Fig. 2
It is intended to.
In the present embodiment, the constant current of described low-power consumption includes front end power circuit 101, DC- with controlling circuit of voltage regulation
D/C voltage adjusts circuit 102 and rear end linear constant current circuit 103.
The front end power circuit 101 includes the power supply output end of power supply circuit 1011, first OUT1, the second power supply output end
OUT2 and feedback circuit 1012；
Wherein, the feedback circuit 1012 includes feedback input end A_in, control signal input Cont and feedback signal
Output end B_out；The feedback input end A_in is connected with the described second power supply output end OUT2, the feedback signal output
B_out is connected with the power supply circuit 1011；The feedback circuit 1012 is according to the voltage of the control signal input Cont
Value, to the output feedback signal of power supply circuit 1011, to control 1011 pairs of the power supply circuit the first power supply output end
OUT1 and the second power supply output end OUT2 magnitude of voltage are adjusted.
It is a kind of circuit theory diagrams of the achievable mode for the front end power circuit that the present invention is provided referring to Fig. 3.
In a kind of achievable mode, as shown in figure 3, feedback circuit 1012 can be provided with optocoupler PCB101, voltage-stablizer UB102
And its peripheral circuit.Wherein, the optocoupler PCB101 includes light emitting diode (the i.e. He of pin 1 of optocoupler PCB101 positioned at primary side
The component of pin 2) and positioned at the optical signal converter (i.e. the component of optocoupler PCB101 pin 3 and pin 4) of secondary.
It is former that the control signal that the control signal input is inputted is accessed to being located at for optocoupler PCB101 by voltage-stablizer UB102
The light emitting diode on side；The light emitting diode is converted to control signal the position that the optocoupler PCB101 is transferred to after optical signal
In the optical signal converter of secondary；The optical signal converter converts optical signals to export after electric signal to the feedback signal
Output end.
Further, the feedback circuit 1012 is additionally provided with resistance RB131 and resistance RB132；The one of the resistance RB131
Hold as the feedback input end, the other end is connected with the anode of the optocoupler PCB101 light emitting diode positioned at primary side；The electricity
Resistance RB132 one end is connected to the anode of the light emitting diode, and the other end is connected on the negative electrode of the light emitting diode.
Wherein, the input (pin 1) positioned at the light emitting diode of primary side by resistance RB131 is used as feedback input end A_in
It is connected with the second power supply output end OUT, and optocoupler PCB101 primary side two ends (pin 1 and pin 2) are in parallel with resistance RB132；It is located at
Output end (pin 4) connection of the optical signal converter of optocoupler PCB101 secondary is used as feedback signal output B_out and power supply
The feedback control end feedback connections of circuit 1011, the other end (pin 3) ground connection of optical signal converter.It should be noted that
Necessary electronic component in the feedback circuits of resistance RB132 not in the present embodiment.
Voltage-stablizer UB102 is preferred to use adjustable precision shunt voltage-stablizer, including negative electrode K, anode A and reference input R,
And the reference voltage of built-in 2.5V (volt), it is preferable that it can be realized using model TL431 voltage-stablizer.Wherein, it is described can
The anode A ground connection of precision shunt voltage-stablizer is debugged, the negative electrode K and optocoupler PCB101 light emitting diode positioned at primary side connects
Connect；Reference input R is used for the control signal for accessing the control signal input Cont.
Further, the feedback circuit 1012 is additionally provided with voltage stabilizing feedback circuit.
In a kind of achievable mode, the voltage stabilizing feedback circuit includes electric capacity CB109 and resistance RB133；The electricity
The one end for holding CB109 is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, one end of the other end and resistance RB133
Series connection；The resistance RB133 other end is connected on the reference input R of the adjustable precision shunt voltage-stablizer.
In another achievable mode, the voltage stabilizing feedback circuit includes electric capacity CB110；The electric capacity CB110's
One end is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, and it is steady that the other end is connected to the adjustable precision shunt
On the reference input R of depressor.
Further, both the above implementation can be combined by the present embodiment, to realize the voltage stabilizing feedback electricity
Road.I.e. described voltage stabilizing feedback circuit is simultaneously provided with electric capacity CB109, resistance RB133 and electric capacity CB110.
As shown in figure 3, voltage-stablizer UB102 negative electrode K is connected with the pin of light emitting diode 2 of optocoupler PCB101 primary sides, voltage stabilizing
Device UB102 anode A ground connection；Resistance RB134 one end is connected with voltage-stablizer UB102 reference input R, other end ground connection；
Electric capacity CB109 one end is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, the other end and the one of resistance RB133
End series connection；The resistance RB133 other end is connected on the reference input R of the adjustable precision shunt voltage-stablizer；The electricity
The one end for holding CB110 is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, and the other end is connected to the adjustable essence
On the reference input R of close shunt regulator.
Further, the reference input R of the adjustable precision shunt voltage-stablizer passes through a divider and the control
Signal input part is connected.In this embodiment, it is preferred that, the divider is a resistance RB150.
As shown in figure 3, electric capacity CB109 one end is connected with optocoupler PCB101 2 pin, after the other end is connected with resistance RB133
It is connected with resistance RB150 one end, the resistance RB150 other end is used as the control signal input Cont；Electric capacity CB110's
One end is connected with voltage-stablizer UB102 negative electrode K, and the other end is connected with voltage-stablizer UB102 reference input R；Resistance RB135's
One end is connected with feedback input end A_in, and the other end is connected with voltage-stablizer UB102 reference input R.Thus, feedback is constituted
A kind of specific embodiment of circuit 1012.
In the present embodiment, increase by a resistance RB150 on voltage-stablizer UB102 reference input R, while passing through control
Signal input part Cont introduces a control signal and carries out Automated condtrol to voltage-stablizer UB102 negative electrode K output voltage values, from
And the regulation to power supply circuit 1011 and its output voltage can be realized.
It is a kind of physical circuit schematic diagram for the front end power circuit that the present invention is provided referring to Fig. 4.
The power supply circuit 1011 includes power supply input circuit 11, switching power circuit 12, multiple-channel output transformer
TB101, LED power output circuit 13 and main board power supply output circuit 14；
The power supply input circuit 11 under the control of the switching power circuit 12 by the power supply signal of access transmit to
The multiple-channel output transformer TB101；As shown in figure 4, the multiple-channel output transformer TB101 includes main winding and auxiliary winding.
Wherein, the coil of the pin of multiple-channel output transformer TB101 9 pin~11 forms primary main winding, multiple-channel output transformer TB101's
The coil of the pin of 1 pin~2 forms secondary main winding；The coil of the pin of multiple-channel output transformer TB101 7 pin~8 formed it is primary it is secondary around
Group, the coil of the pin of multiple-channel output transformer TB101 1 pin~6 forms secondary auxiliary winding, wherein, based on the coil of the pin of 1 pin~2
The shared winding of winding and time winding, can also, it is necessary to can be with common sparing winding between explanation, secondary main winding and auxiliary winding
Using independent winding.When it is implemented, the main winding will be transmitted after the power supply signal transformation it is defeated to the main board power supply
Go out circuit 14, and exported by the described second power supply output end OUT2；The auxiliary winding synchronously becomes the power supply signal
Transmit to the LED and power output circuit 13 after pressure, and exported by the described first power supply output end OUT1；Therefore, Fig. 4
In multiple-channel output transformer TB101 there is two output voltage, especially, in technical field of television sets, first power supply it is defeated
It is preferably the power supply output end for supplying LED backlight to go out to hold OUT1, and the second power supply output end OUT2 is preferably supply TV owner
The power supply output end of plate.
In the present embodiment, output voltages of the multiple-channel output transformer TB101 per circle coil is identical, when changing wherein
Output voltage all the way, then the output voltage on another road also will synchronously follow change.For example, the coil of main winding is 2 circles,
Output voltage is 12V, i.e., the output voltage per circle coil is 6V；Assuming that the output voltage of auxiliary winding is 120V, then auxiliary winding
Coil turn is 20 circles.And the coil turn of main winding and auxiliary winding can be adjusted according to practical application, i.e., described master
The coil ratio of winding and the auxiliary winding is 1：N, N ＞ 0, i.e., when main winding output voltage be V1 when, auxiliary winding it is defeated
Go out voltage for V2=N*V1.
It should be noted that the feedback input end A_in of feedback circuit 1012 can connect the first of the power supply circuit 1011
Power the power supply output end OUT2 of output end OUT1 or second, has no effect on the implementation of the present embodiment.
The outside control that the present invention can be accessed by the control signal input Cont of linear regulation feedback circuit 1012 is believed
Number size, so as to control the first power supply output end OUT1 or second to power output end OUT2 magnitude of voltage.Specifically, with described
The feedback input end A_in of feedback circuit 1012 is connected to exemplified by the second power supply output end OUT2 of the power supply circuit 1011, this
The basic functional principle of embodiment is mainly：
When the output voltage of power supply circuit 1011 is raised, (the first power supply output end OUT1 and the second power supply output end OUT2 are same
When Shi Shenggao), control signal input Cont control signal passes through resistance RB135 and resistance RB134, resistance RB150 partial pressures
Voltage afterwards is transmitted to voltage-stablizer UB102 reference input R, and voltage-stablizer UB102 is by reference input R signal value and its
Portion's reference voltage is compared.When reference input R signal value is more than reference voltage, between voltage-stablizer UB102 anode and cathodes
Voltage reduction, and then optocoupler PCB101 electric current increase, dynamic electric resistor diminishes between optocoupler PCB101 colelctor electrodes and emitter stage
(4 pin of optocoupler PCB101 current collection extremely optocoupler, 3 pin of transmitting extremely optocoupler), the voltage between colelctor electrode and emitter stage becomes
It is low；PWM (Pulse Width Modulation, pulse width modulation) the control chip UB101 connected therewith feedback pin
COMP level step-down, pwm chip UB101 output duty cycles reduce, so that multiple-channel output transformer TB101's is defeated
Go out voltage reduction.Conversely, when reference input R signal value is less than reference voltage, may be such that multiple-channel output transformer TB101
Output voltage (output voltage for including the first power supply output end OUT1 and the second power supply output end OUT2) rise.
Therefore, for the reference input R accesses that adjust voltage-stablizer UB102 voltage signal size so as to controlling transformer
TB101 output voltage, the present invention is by increasing resistance RB150 and realizing in resistance RB150 side incoming control signal
This purpose.Specifically, when needing modulation second to power output end OUT2 output voltage, and voltage-stablizer UB102 inside base
When quasi- voltage is 2.5V, the output voltage values calculation formula of the second power supply output end is：Vout2=reference voltage * (1+R135/
R134), wherein, reference voltage is preferably 2.5V.Preferably, a PWM_12V signal can be exported extremely by outside control chip
The control signal input Cont, via resistance RB150 by PWM_12V signals transmit to resistance RB134 and resistance RB135 it
Between series connection point (i.e. voltage-stablizer UB102 reference input R).
When it is implemented, control signal input Cont PWM_12V signals can use any one perseverance in 0-3.3V
Determine magnitude of voltage, or, using PWM (Pulse Width Modulation, pulse width modulation) ripple of certain waveform.According to
The output voltage values calculation formula of two power supply output ends：Vout2=reference voltages * (1+R135/R134), under any circumstance,
When by control signal input Cont from outside control chip to feedback circuit 1012 input control signal for 3.3V (most
When greatly), the second power supply output end OUT2 output voltage is minimum, because control signal input Cont input voltage
(3.3V) be more than voltage-stablizer UB102 reference voltage 2.5V (when circuit stability works voltage-stablizer UB102 1 pin voltage and
Reference voltage is almost equal), so be the equal of now that resistance RB150 is connected on 3.3V power supply, that is, equivalent to by electricity
Resistance RB150 has been connected in parallel on resistance RB135, according to Vout2 voltage equation iting can be seen from, due to resistance RB135 parallel connection resistance
RB150, the equivalent resistance equivalent to resistance RB135 is reduced, so that output voltage Vout2 is reduced.Core is controlled when passing through outside
When the control signal that piece is inputted to the control signal input Cont of feedback circuit 1012 is 0V (minimum), the second power supply output end
OUT2 output voltage is maximum because the control signal of control signal input Cont inputs when being 0V equivalent to ground connection, this
When be connected in parallel on equivalent to by resistance RB150 on resistance RB134, according to above-mentioned voltage computing formula, because resistance RB134 is in parallel
Resistance RB150, the equivalent resistance equivalent to resistance RB135 diminishes, so that output voltage Vout2 is raised.
It can be seen that, the control signal inputted by the control signal input Cont of linear regulation feedback circuit 1012 is (for example
Above-mentioned 0V~3.3V constant voltage signal or PWM ripples), it may be such that the second power supply output end OUT2 output voltage in reality
(Vout2_max=12.5V, Vout2_min=11.5V) is adjusted between common voltage scope 11.5V~12.5V, so that
Realize fine setting；Similarly, in the presence of multiple-channel output transformer TB101, the first power supply output end OUT1 output voltage also will
Realize synchronous automatic adaptation regulation.
In concrete application occasion, under product ideal case (power supply circuit output reduce), can be by linear regulation outside
Control signal input Cont from portion's control chip to feedback circuit 1012 input control signal be high level (such as 3.3V), from
And the second of power supply circuit 1011 voltage for powering output end OUT2 outputs can be made to be minimum output voltage, it is possible to reduce television set
The stand-by power consumption of mainboard.
In addition, the LED string to be powered is in series by multiple LEDs, with the quantity of LED string to be powered
Increase, the supply voltage required for after multiple LED strip connection constantly increases, it is therefore desirable to the first power supply output end OUT1 output
Voltage can adaptively respond LED number change, automatically adjust its output voltage values.
Because the first power supply output end OUT1 and the second power supply output end OUT2 belong to a transformer TB101, right
When first power supply output end OUT1 output voltage is adjusted, the second power supply output end OUT2 output voltage will necessarily be produced
Raw influence, and the supply voltage of TV SKD is typically more fixed (about 12V), if the second power supply output end OUT2 output electricity
Press amplitude fluctuation excessive, it will the overall performance of influence TV SKD, and too high supply voltage possibly even burns TV
Mainboard.
As shown in Fig. 2 the constant current for the low-power consumption that the present invention is provided is additionally provided with DC-DC voltage-regulations electricity with controlling circuit of voltage regulation
Road 102.Specifically, the input of the DC-DC voltage regulator circuits 102 is connected with the described second power supply output end OUT2, is used
It is adjusted in by the described second power supply output end OUT2 voltage signals exported after fixed voltage signal, output to television set
Mainboard is powered.
So that supply voltage needed for TV SKD is 12V as an example, the present embodiment is in front end power circuit 101 and TV owner
Increase one-level DC-DC voltage regulator circuits 102 between plate, pass through the response of DC-DC voltage regulator circuits 102 second power supply output end
The change of OUT2 output voltage, automatically adjusts output to the voltage value of TV SKD.DC-DC voltage regulator circuits
102 can be more than or less than 12V situation according to the second power supply output end OUT2 output voltage, using reduction regulation circuit
Or rise voltage regulator circuit.
It is that the DC-DC voltage regulator circuits that the present invention is provided are a kind of circuit theory when rising voltage regulator circuit referring to Fig. 5
Figure.When the DC-DC voltage regulator circuits 102 is rise voltage regulator circuit, including：Connect with the described second power supply output end OUT2
Inductor LB801, on-off circuit 1021, voltage conversion chip UB801 and its peripheral circuit 1022 connect, and output filtered electrical
Road 1023；Specifically, can be by electric using boosting regulation by the second power supply output end OUT2 output voltage in the present embodiment
Road obtains 12.5Vout after being boosted and powered to TV SKD.
The on-off circuit 1021 is connected with inductor LB801 output ends, by the described second power supply output end OUT2 electricity
Pressure signal, which is transmitted into voltage conversion chip UB801, is adjusted to stable voltage signal；Again will by the on-off circuit 1021
The voltage signal of stabilization after regulation is transmitted to the output filter circuit 1023 filtered after there is provided enter to TV SKD
Row power supply.
In order to realize the power supply output end of automatic adjusument first OUT1 output voltage, while ensureing supply TV SKD
Voltage signal stability, it is defeated that the present embodiment realizes the second power supply after it with the addition of DC-DC voltage regulator circuits 102, then
Go out to hold the adjustability of OUT2 output voltage.The operating voltage range that TV SKD allows is usually 11.5V~12.5V, then
After DC-DC voltage regulator circuits 102 start effect be after the second power supply output end OUT2 output voltage is adjusted
12.5Vout output ends export 11.5V~12.5V voltage signal.
Described linear constant current is additionally provided with rear end linear constant current circuit 103 with controlling circuit of voltage regulation, specifically, such as Fig. 2 institutes
Show, the rear end linear constant current circuit 103 includes comparison circuit 1031 and constant-current control circuit 1032；The comparison circuit 1031
Provided with reference signal input PWM_REF, to access constant current reference voltage VREF；The constant-current control circuit 1032 is in the ratio
Compared with being connected under the regulation of circuit 1031 with one end LED- of LED string to be powered, the other end LED+ of the LED string to be powered
It is connected with the described first power supply output end OUT1；
Voltage acquisition all the way is drawn in the constant-current control circuit 1032 with the LED string junction P to be powered to export
Hold (the output terminals A DC_12V in such as Fig. 2), with the voltage change according to the LED string to be powered, the front end power circuit
The magnitude of voltage of the control signal input Cont is adjusted, so as to control the first power supply output end OUT1, the second power supply defeated
Go out to hold OUT2 output voltage.
It is a kind of circuit theory diagrams of the achievable mode for the rear end linear constant current circuit that the present invention is provided referring to Fig. 6.
When it is implemented, in the rear in linear constant-current circuit 103, the comparison circuit 1031 also includes operation amplifier
Device UB1A, the operational amplifier UB1A inverting input pass through a resistance RB12 and the reference signal input PWM_
REF connections；The normal phase input end of the operational amplifier UB1A is connected with current feedback circuit.Specifically, as shown in fig. 6, should
Current feedback circuit includes multiple constant current detection resistances, respectively resistance RB5, resistance RB6, resistance RB7, resistance (RB8), resistance
RB9；Wherein, resistance RB6, resistance RB7, resistance RB8 and resistance RB9 composition parallel circuits, one end connection of the parallel circuit
On resistance RB5 one end, the other end ground connection of the parallel circuit；The resistance RB5 other end is connected to the operation amplifier
On the normal phase input end of device.Further, the current feedback circuit also includes electric capacity CB5；A termination of the electric capacity CB5
Ground, the other end is connected on the normal phase input end of the operational amplifier.The circuit of wherein resistance RB5 and electric capacity CB5 compositions can
It is filtered with the signal of the normal phase input end to being input to operational amplifier UB1A.
Preferably, the comparison circuit 1031 also includes a clamp diode DB1, to protect the comparison circuit 1031
Normal work.
In the rear in linear constant-current circuit 103, the constant-current control circuit 1032 also includes a switching tube QB1.Open
It can be that triode or MOS (Metal-Oxid-Semiconductor, metal-oxide semiconductor (MOS)) field-effect are brilliant to close pipe QB1
Body pipe, abbreviation metal-oxide-semiconductor or field-effect transistor.Wherein, switching tube QB1 conduction and cut-off state is with the physical characteristic of its own
It is associated.For example, when switching tube QB1 is triode, according to the VA characteristic curve of triode, there is saturation region, amplification
Area and cut-off region, the influence different to the voltage signal generation between the emitter stage and colelctor electrode of triode respectively, such as when three poles
When pipe is operated in saturation region, equivalent to short-circuit (conducting state) between the emitter stage and colelctor electrode of triode.
In the present embodiment, when the switching tube QB1 is triode, the constant-current control circuit 1032 passes through described three
The colelctor electrode of pole pipe is connected with one end (LED-) of the LED string to be powered；The emitter stage of the triode and the clamper
Diode DB1 anode connection；When the switching tube QB1 is field-effect transistor, the constant-current control circuit 1032 passes through
The drain electrode of the field-effect transistor is connected with one end (LED-) of the LED string to be powered；The field-effect transistor
Source electrode is connected with the anode of the clamp diode DB1.
When it is implemented, clamp diode DB1 minus earth, anode is connected to operational amplifier by resistance RB5
UB1A normal phase input end.After the startup of rear end linear constant current circuit 103, by operational amplifier UB1A adjustment, its positive
Input connects the magnitude of voltage and its constant current reference voltage V that reversely input is accessed that constant current detection resistance is gotREFIt is equal,
Then as constant current reference voltage VREFDuring turn-on voltage (about 0.7V) higher than clamp diode DB1, clamp diode DB1 will
Conducting ground connection, i.e., by the voltage at resistance RB6, resistance RB7, resistance RB8 and resistance RB9 the constant current detection resistance two ends composed in parallel
Value is clamped diode DB1 and limited, therefore, and clamp diode DB1 serves certain protective effect.
Also, due to switching tube QB1 emitter stage (switching tube QB1 is triode) or source electrode (switching tube QB1 is metal-oxide-semiconductor)
It is connected with clamp diode DB1 anode, therefore circulation switching tube QB1 constant current value can be calculated by below equation：
As constant current reference voltage VREFDuring turn-on voltage higher than clamp diode DB1, circulation switching tube QB1 constant current
Signal is：IConstant currentThe resistance of=DB1 turn-on voltage/constant current detection resistance；As constant current reference voltage VREFLess than the pole of clamper two
During pipe DB1 turn-on voltage, circulation switching tube QB1 constant current signal is：IConstant current=constant current reference voltage VREF/ constant current detection electricity
The resistance of resistance.Generally, clamp diode DB1 turn-on voltage is 0.7V, and the resistance of constant current detection resistance is resistance RB6, electricity
Hinder total resistance after RB7, resistance RB8 and resistance RB9 parallel connections.
In the present embodiment, the first power supply output end is connected to the positive pole LED+ of LED string, passes through switching tube QB1 perseverance
Flow control, then constant current detection resistance (resistance RB6, resistance RB7, resistance RB8 and resistance RB9 parallel resistance) is concatenated to ground, it is permanent
The size of current of LED string is converted into voltage signal and is linked into operational amplifier UB1A and constant current reference voltage by stream detection resistance
VREF(it is controlled by outside master chip, or access fixed voltage, if the constant current value I that fixed voltage is then exportedConstant currentIt is then solid
Definite value, it is impossible to carry out the regulation of constant current size) it is compared and amplifies, so that controlling switch pipe QB1 adjusts the electric current of LED string
Keep constant.
The plurality of LEDs lamp when it is implemented, LED string can typically connect, wherein the operating voltage of single LEDs is generally 2.8V
~3.4V, the operating voltage after the series connection of plurality of LEDs lamp will accordingly increase.So that switching tube QB1 is metal-oxide-semiconductor as an example, switching tube QB1's
Voltage between drain electrode and source electrode：VDS=VOUT1- LED string operating voltage-constant current reference voltage VREF.Therefore, rear end is linear
Constant-current circuit 103 enters after working condition, the voltage V between switching tube QB1 drain electrode and source electrodeDSWill be by LED string
The influence of operating voltage size, may also be subjected to multiple-channel output transformer TB101 crossmodulation in addition (general range is 7%)
Influence.
In the prior art, with the change of LED string voltage, switching tube QB1 drain-source voltage VDSVoltage is also synchronously sent out
Changing, switching tube QB1 this Partial Power (VDS* constant current value IConstant current) form that will be converted into heat comes out, VDSElectricity
Pressure is bigger, and switching tube QB1 power consumption is bigger, and temperature is higher.Therefore the excessive switching tube QB1 of power consumption can reduce power-efficient and
Switching tube QB1 is caused to overheat and be easily damaged.In order to reduce switching tube QB1 temperature, multiple metal-oxide-semiconductors or triode can be used
Parallel connection is used as switching tube QB1, but this technical scheme result in the increase of cost.Therefore, the present embodiment is linear to rear end
Constant-current circuit 103 makes further improvement.
Referring to Fig. 4~Fig. 6, the present embodiment in the constant-current control circuit 1032 with the LED to be powered by contacting
Meet place P and draw voltage acquisition output terminals A DC_12V all the way, be that voltage is adopted to detect the voltage change of LED string to be powered in real time
Collect the pressure drop between output terminals A DC_12V and reference signal input PWM_REF and set a threshold value, or, it is voltage acquisition
Output terminals A DC_12V output voltage sets a steady state value (reference signal input PWM_REF voltage VREFIt is general compared with
It is small), when the pressure drop between voltage acquisition output terminals A DC_12V and reference signal input PWM_REF be more than the threshold value, or
When voltage acquisition output terminals A DC_12V output voltage is more than the steady state value, by adjusting the control in front end power circuit 101
Signal input part Cont processed control signal PWM_12V, controls optocoupler PCB101 by the situation of change of the operating voltage of LED string
(the i.e. first power supply output end OUT1 voltage change situation) feeds back to pwm chip UB101, pwm chip UB101 controls
Switching tube QB101 processed changes dutycycle, so that voltage acquisition output terminals A DC_12V magnitude of voltage subtracts reference signal input
PWM_REF magnitude of voltage is held equal or close to the default threshold value (or voltage acquisition output terminals A DC_12V magnitude of voltage etc.
In or close to the steady state value), therefore, the present embodiment can by control signal input Cont control signal PWM_12V,
Pressure drop between stop voltage collection output terminals A DC_12V and reference signal input PWM_REF, so as to reduce switching tube QB1
Drain-source voltage VDSInfluenceed by the voltage change of LED string, reduce switching tube QB1 power consumption and ensure that power-efficient.
In the present embodiment, due to the first power supply output end OUT1 and the second power supply output end OUT2 output voltage by
Multiple-channel output transformer TB101 is exported, then is reduced above by control signal input Cont control signal PWM_12V
While switching tube QB1 power consumption, the voltage of multiple-channel output transformer TB101 all output windings will necessarily be caused to change
Become (the second power supply output end OUT2 powered to TV SKD output voltage will also change), still, due to this
Embodiment is provided with DC-DC voltage regulator circuits 102, therefore this implementation between the second power supply output end OUT2 and TV SKD
Example can prevent from causing the change model of TV SKD power supply because excessive to the adjustment of the output voltage of front end power circuit
Excessive situation is enclosed to occur, and DC-DC voltage regulator circuits 102 can be according to actual conditions using decompression or booster circuit.
A kind of constant current for low-power consumption that the present invention is provided and controlling circuit of voltage regulation, are provided with front end power circuit, DC-DC electricity
Voltage regulator circuit and rear end linear constant current circuit, the supply voltage of two-way output is adjusted using front end power circuit, and in front end
Feedback circuit is set up in power circuit, and is provided with control signal input in a feedback circuit, to realize control front end power supply
Voltage of the circuit in the first power supply output end and the second power supply output end；Because the voltage signal of control signal input will be same
When influence first power the output voltage of output end and the second output end, therefore the present invention further passes through DC-DC voltage-regulations
Circuit come ensure output to motherboard circuit voltage signal stabilization；And string is adapted to automatically by setting up rear end linear constant current circuit
The change of the LED backlight quantity of connection, the magnitude of voltage after being connected according to LED backlight adjusts the control signal input
Magnitude of voltage so that passing through front end power circuit and its feedback circuit controls the first power supply output end, the second power supply output
The output voltage at end, and the first power supply output end is connected to LED backlight and is powered, and realizes and LED backlight quantity phase
The voltage automation regulation of adaptation, reduces the power consumption of circuit switch element, and ensure that the stabilization of the supply voltage of motherboard circuit
Property.
It is that the constant current for the low-power consumption that the present invention is provided and the structure of another embodiment of controlling circuit of voltage regulation are shown referring to Fig. 7
It is intended to.
The present embodiment and the distinctive points of previously described embodiment are, on the basis of previously described embodiment, enter
One step, the constant current for the low-power consumption that the present embodiment is provided also includes a control master chip 104 with controlling circuit of voltage regulation.Wherein, it is preceding
Hold power circuit 101, DC-DC voltage regulator circuits 102 and the essential structure of rear end linear constant current circuit 103 and operation principle and
Previously described embodiment is identical, will not be repeated here.
Control master chip 104 and the control signal input Cont, the reference signal input PWM_REF with
And the voltage acquisition output terminals A DC_12V is connected respectively；
The control master chip 104 adjusts the output to institute according to the voltage change of the voltage acquisition output terminals A DC_12V
State control signal input Cont signal magnitude, with control the front end power circuit 101 first power output end OUT1,
Second power supply output end OUT2 output voltage values；And it is linear to the rear end by the reference signal input PWM_REF
Constant-current circuit 103 inputs the constant current reference voltage VREF。
Specifically, when the control master chip 104 detects the voltage acquisition output terminals A DC_12V with described with reference to letter
When number input PWM_REF voltage difference is more than default threshold value, the control master chip 104 will be exported to the control letter
Number input Cont voltage signal dutycycle reduces.When it is implemented, the control master chip 104 is built-in with analog-to-digital conversion
Device, the voltage signal for the control master chip 104 to be accessed is converted to data signal.From voltage acquisition output terminals A DC_
The voltage signal that 12V collections are obtained is first passed around after the conversion of analog-digital converter, obtains corresponding data signal, then pass through control
The processing of other processing units in master chip 104.
The present embodiment is defeated to control signal input Cont, the reference signal as a result of same control master chip
Enter to hold the signal of tri- terminals of PWM_REF and the voltage acquisition output terminals A DC_12V to be handled, therefore described previously
Effective effect on the basis of, can further be exported in real time according to reference signal input PWM_REF and voltage acquisition
Hold ADC_12V signal intensity and send corresponding control signal to control signal input Cont, therefore can be rapidly to LED
The change of lamp string operating voltage is responded.
The embodiment of the present invention additionally provides a kind of television set of adaptation power supply regulation, including：TV SKD, backlight
LED string, and the constant current of the low-power consumption described in any one and controlling circuit of voltage regulation above.
Wherein, the constant current of the low-power consumption and controlling circuit of voltage regulation and the TV SKD and the backlight LED light string
Connect respectively, for the operating voltage according to the backlight LED light string by incoming control signal, automatic adjusument supply is described
The voltage signal of backlight LED light string, and stablize output to the supply voltage signal of the TV SKD.
The present embodiment is applied in field of television and to TV using linear constant current and controlling circuit of voltage regulation after improving
Mainboard, the power supply signal of backlight of television LED string are controlled.Specifically, it is automatic using the first power supply output end OUT1
Output voltage is adjusted according to the change of backlight LED light string quantity；Using DC-DC voltage regulator circuits to the second power supply output end
Voltage boosted or decompression processing so as to supply TV SKD voltage signal be fixed, therefore ensure supply
The voltage signal of TV SKD is not influenceed by the change of backlight LED light bars quantity；Both realized and LED backlight quantity phase
Adaptation voltage automation regulation, reduce circuit switch element power consumption, in turn ensure that TV SKD supply voltage it is steady
It is qualitative.Described above is the preferred embodiment of the present invention, it is noted that come for those skilled in the art
Say, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as this
The protection domain of invention.
Claims (21)
1. constant current and the controlling circuit of voltage regulation of a kind of low-power consumption, it is characterised in that including：Front end power circuit, DC-DC voltages are adjusted
Economize on electricity road and rear end linear constant current circuit；
The front end power circuit includes power supply circuit, the first power supply output end, the second power supply output end and feedback circuit；
The feedback circuit includes feedback input end, control signal input and feedback signal output；The feedback input end
It is connected with the described second power supply output end, the feedback signal output is connected with the power supply circuit；The feedback circuit root
According to the magnitude of voltage of the control signal input, to the power supply circuit output feedback signal, to control the power supply circuit pair
The magnitude of voltage of the first power supply output end and the second power supply output end is adjusted；
The input of the DC-DC voltage regulator circuits is connected with the described second power supply output end, for described second to be powered
The voltage signal that output end is exported is adjusted to after fixed voltage signal, and output to mainboard is powered；
The rear end linear constant current circuit includes comparison circuit and constant-current control circuit；The comparison circuit is defeated provided with reference signal
Enter end, to access constant current reference voltage；The constant-current control circuit under the regulation of the comparison circuit with LED string to be powered
One end connection, the other end of the LED string to be powered with described first power output end be connected；
Voltage acquisition output end all the way is drawn with the LED string junction to be powered in the constant-current control circuit, with basis
The voltage change of the LED string to be powered, adjusts the magnitude of voltage of the control signal input, so as to control the front end electricity
Source circuit adjustment the first power supply output end, the output voltage of the second power supply output end.
2. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 1, it is characterised in that also including a main core of control
Piece；
The control master chip is exported with the control signal input, the reference signal input and the voltage acquisition
End is connected respectively；
The control master chip adjusts the output to the control signal input according to the voltage change of the voltage acquisition output end
The signal magnitude at end, the output voltage for output end, the second power supply output end of being powered with control the front end power circuit first
Value；And the constant current reference voltage is inputted to the rear end linear constant current circuit by the reference signal input.
3. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 2, it is characterised in that when the control master chip inspection
When measuring the voltage difference of the voltage acquisition output end and the reference signal input more than default threshold value, the control
Master chip reduces the voltage signal dutycycle exported to the control signal input.
4. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 3, it is characterised in that the control master chip includes
Analog-digital converter, for the voltage signal of the control master chip access to be converted into data signal.
5. the constant current of low-power consumption and controlling circuit of voltage regulation as described in any one of Claims 1 to 4, it is characterised in that the power supply
Circuit include power supply input circuit, switching power circuit, multiple-channel output transformer, LED power output circuit and main board power supply it is defeated
Go out circuit；
The power supply input circuit transmits the power supply signal of access to the multichannel under the control of the switching power circuit
Export transformer；
The multiple-channel output transformer includes main winding and auxiliary winding；The main winding will be transmitted after the power supply signal transformation to
The main board power supply output circuit, and exported by the described second power supply output end；The auxiliary winding believes the power supply
Transmit to the LED and power output circuit after number synchronous transformation, and exported by the described first power supply output end；The master
The coil ratio of winding and the auxiliary winding is 1：N, N ＞ 0.
6. the constant current of low-power consumption and controlling circuit of voltage regulation as described in any one of Claims 1 to 4, it is characterised in that before described
Hold in power circuit, the feedback circuit is additionally provided with optocoupler PCB101, voltage-stablizer UB102；
The optocoupler PCB101 includes the light emitting diode and the optical signal converter positioned at secondary positioned at primary side；
The voltage-stablizer UB102 accesses to the control signal that the control signal input is inputted the position of the optocoupler PCB101
In the light emitting diode of primary side；The light emitting diode, which is converted to control signal, is transferred to the optocoupler PCB101 after optical signal
The optical signal converter positioned at secondary；The optical signal converter converts optical signals to export after electric signal to the feedback
Signal output part.
7. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 6, it is characterised in that the voltage-stablizer UB102 is adopted
With adjustable precision shunt voltage-stablizer, including negative electrode K, anode A and reference input R, and interior have reference voltage；
Wherein, the anode A ground connection of the adjustable precision shunt voltage-stablizer, the negative electrode K and optocoupler PCB101's is located at primary side
Light emitting diode connection；Reference input R is used for the control signal for accessing the control signal input.
8. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 7, it is characterised in that the feedback circuit is additionally provided with
Voltage stabilizing feedback circuit.
9. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 8, it is characterised in that the voltage stabilizing feedback circuit bag
Include electric capacity CB109 and resistance RB133；
One end of the electric capacity CB109 is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, the other end and resistance
RB133 one end series connection；The resistance RB133 other end is connected to the reference input R of the adjustable precision shunt voltage-stablizer
On.
10. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 8, it is characterised in that the voltage stabilizing feedback circuit
Including electric capacity CB110；One end of the electric capacity CB110 is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, another
End is connected on the reference input R of the adjustable precision shunt voltage-stablizer.
11. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 8, it is characterised in that the voltage stabilizing feedback circuit
Including electric capacity CB109, resistance RB133 and electric capacity CB110；
One end of the electric capacity CB109 is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, the other end and resistance
RB133 one end series connection；The resistance RB133 other end is connected to the reference input R of the adjustable precision shunt voltage-stablizer
On；
One end of the electric capacity CB110 is connected on the negative electrode K of the adjustable precision shunt voltage-stablizer, and the other end is connected to institute
On the reference input R for stating adjustable precision shunt voltage-stablizer.
12. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 8, it is characterised in that the feedback circuit is also set
There are resistance RB131 and resistance RB132；
One end of the resistance RB131 is the feedback input end, the other end and be located at primary side luminous the two of optocoupler PCB101
The anode connection of pole pipe；One end of the resistance RB132 is connected to the anode of the light emitting diode, and the other end is connected to described
On the negative electrode of light emitting diode.
13. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 8, it is characterised in that the adjustable is accurate simultaneously
The reference input R of connection voltage-stablizer is connected by a divider with the control signal input.
14. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 13, it is characterised in that the divider is resistance
RB150。
15. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 5, it is characterised in that linear perseverance in the rear
In current circuit, the comparison circuit also includes operational amplifier；
The inverting input of the operational amplifier is connected by resistance RB12 with the reference signal input；The computing is put
The normal phase input end of big device is connected with current feedback circuit.
16. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 15, it is characterised in that the current feedback circuit
Including multiple constant current detection resistances, respectively resistance RB5, resistance RB6, resistance RB7, resistance RB8, resistance RB9；
Wherein, resistance RB6, resistance RB7, resistance RB8 and resistance RB9 composition parallel circuits, one end connection of the parallel circuit
On resistance RB5 one end, the other end ground connection of the parallel circuit；The resistance RB5 other end is connected to the operation amplifier
On the normal phase input end of device.
17. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 16, it is characterised in that the current feedback circuit
Also include electric capacity CB5；One end ground connection of the electric capacity CB5, the other end is connected on the normal phase input end of the operational amplifier.
18. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 17, it is characterised in that linear perseverance in the rear
In current circuit, the constant-current control circuit also includes a switching tube；
When the switching tube is triode, the constant-current control circuit by the colelctor electrode of the triode with it is described to be powered
One end connection of LED string；The emitter stage of the triode is connected by the normal phase input end of resistance RB5 and the operational amplifier
Connect；
When the switching tube is field-effect transistor, the constant-current control circuit by the drain electrode of the field-effect transistor with
One end connection of the LED string to be powered；The source electrode of the field-effect transistor passes through resistance RB5 and the operational amplifier
Normal phase input end connection.
19. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 18, it is characterised in that the comparison circuit is also wrapped
Include a clamp diode；
The minus earth of the clamp diode；The anode of the clamp diode is connected with the emitter stage of the triode, or
Person, the anode of the clamp diode is connected with the source electrode of the field-effect transistor.
20. constant current and the controlling circuit of voltage regulation of low-power consumption as claimed in claim 19, it is characterised in that the DC-DC voltages are adjusted
Economize on electricity Lu Weisheng voltage regulator circuits or reduction regulation circuit.
21. a kind of television set of adaptation power supply regulation, it is characterised in that including：TV SKD, backlight LED light string, and
The constant current of low-power consumption as described in any one of claim 1~20 and controlling circuit of voltage regulation；
The constant current of the low-power consumption is connected respectively with controlling circuit of voltage regulation with the TV SKD, the backlight LED light string, is used
In the operating voltage according to the backlight LED light string by incoming control signal, automatic adjusument supplies the backlight LED light string
Voltage signal, and stable export to the supply voltage signal of the TV SKD.
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| CN201410476653.7A CN104253955B (en) | 2014-09-17 | 2014-09-17 | Low-power-consumption constant-current and voltage-stabilizing control circuit and television |
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| CN113163140B (en) * | 2020-01-22 | 2023-05-09 | 海信视像科技股份有限公司 | Display device |
| CN114401567B (en) * | 2020-10-09 | 2024-06-11 | 京东方科技集团股份有限公司 | Control method of driving circuit, driving circuit and light-emitting substrate |
| CN112366945A (en) * | 2020-10-26 | 2021-02-12 | 深圳市必易微电子股份有限公司 | Isolated multi-output power supply circuit and control circuit and dynamic response method thereof |
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| WO2013155809A1 (en) * | 2012-04-20 | 2013-10-24 | 青岛海信信芯科技有限公司 | Backlight driving voltage control device, backlight driving voltage control method, television, machine readable program and storage medium thereof |
| CN103177698A (en) * | 2013-03-27 | 2013-06-26 | 深圳市华星光电技术有限公司 | Light-emitting diode (LED) backlight driving circuit and backlight module |
| CN203289702U (en) * | 2013-05-16 | 2013-11-13 | 深圳创维－Rgb电子有限公司 | A backlight power supply circuit, a power supply apparatus, and a television set |
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| CN104253955A (en) | 2014-12-31 |
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Effective date of registration: 20181030 Address after: 510663 5, No. 192, Ke Zhu Road, Guangzhou economic and Technological Development Zone, Guangdong Patentee after: GUANGZHOU SHIZHEN INFORMATION TECHNOLOGY Co.,Ltd. Address before: 510663, 4, No. 192, Ke Zhu Road, science and Technology City, Guangzhou high tech Industrial Development Zone, Guangdong Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |
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