CN203554294U - Power supply circuit and LCD television - Google Patents
Power supply circuit and LCD television Download PDFInfo
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- CN203554294U CN203554294U CN201320724565.5U CN201320724565U CN203554294U CN 203554294 U CN203554294 U CN 203554294U CN 201320724565 U CN201320724565 U CN 201320724565U CN 203554294 U CN203554294 U CN 203554294U
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Abstract
The utility model provides a power supply circuit and an LCD television. The power supply circuit comprises: a power conversion circuit for receiving a direct current from the outside, converting the direct current to an alternating current, and outputting the alternating current to a transformer; the transformer for coupling the voltage of the alternating current and outputting a first voltage to a first output circuit; the first output circuit, which receives the first voltage and supplies a load in a first output circuit with power; a sampling circuit corresponding to the load; and a constant current feedback control circuit, which is connected between an output terminal of the load and the corresponding sampling circuit, obtains a sample current flowing through the sampling circuit, and controls connection and disconnection of a circuit between the load and the sampling circuit according to the sample circuit. According to the technical scheme, the structure of a power supply circuit in the prior art is simplified, and the power loss of the whole circuit is reduced.
Description
Technical field
The utility model relates to Display Technique field, in particular to a kind of power supply circuits and a kind of LCD TV with these power supply circuits.
Background technology
There are two power supply loops in LED LCD TV, and the one, feed circuit of mainboard, another is LED-backlit drive circuit.Main board power supply needs stable voltage, and LED-backlit drives needs stable electric current, and this has determined to need two control loops that stable mainboard voltage and stable LED drive current are provided respectively in TV electric power system.The scheme that TV electric power system adopts is mainly to produce stable main board power supply voltage by one-level power conversion circuit, as shown in Figure 1A, by constant voltage feedback control circuit 104, realizes the stable regulation to main board power supply voltage.In addition, by another voltage of transformer coupled generation and by BOOST circuit, obtain stable LED drive current, as shown in Figure 1B.As shown in Figure 1A, first power conversion part (being power conversion circuit 102) adopts common AC-DC circuit structure, produce main board power supply voltage Vo1 also by subsidiary voltage Vo2 of transformer coupled generation, and Vo2 voltage does not have independent voltage stabilizing loop, thereby directly driving LED lamp obtains specified electric current, therefore by BOOST drive circuit 108, Vo2 is boosted (as shown in Figure 1B), feedback LED electric current regulates the output voltage of BOOST circuit 106 to obtain specified LED electric current.Previous stage power conversion circuit obtains stable mainboard voltage like this, and rear one-level BOOST booster circuit (i.e. second power conversion part) obtains stable LED drive current.
This scheme has obtained stable mainboard voltage and stable LED drive current by two power conversion circuits, power loss is larger, and this driving circuit section needs special driving chip to coordinate Boost topology peripheral circuit, and device is more, and circuit structure is more complicated.
Utility model content
Consider above-mentioned background technology, utility model object of the present utility model is to provide a kind of power supply circuits, can simplify circuit framework.
In view of this, according to an aspect of the present utility model, a kind of power supply circuits are provided, comprise: power conversion circuit, be connected to transformer, receive from outside direct current, described direct current is transformed into alternating current, and exports described alternating current to described transformer; Described transformer, is connected to the first output circuit, and the voltage of described alternating current is coupled, and to described the first output circuit, exports the first voltage; Described the first output circuit, receives described the first voltage, and to the load supplying on described the first output circuit; Sample circuit, corresponding with described load, for obtaining the electric current in described load; Constant current feedback control circuit, is connected between described load output and the sample circuit corresponding to described load, obtains the sample rate current that flows through described sample circuit, according to the connecting and disconnecting of the circuit between load described in described sample rate current control and described sample circuit.
In these power supply circuits, by constant current feedback control circuit, the electric current of the load on the first output circuit is controlled, thereby obtain specified direct current, these power supply circuits have saved BOOST booster circuit and the related peripheral device of original power supply circuits, thereby simplified the structure of power supply circuits, and in these power supply circuits, only have one-level power conversion, therefore more original two stage power translation circuit its reduced power loss.
According on the other hand of the present utility model, a kind of LCD TV is provided, comprise the power supply circuits described in technique scheme.This LCD TV has the technique effect identical with above-mentioned power supply circuits, adopts the LCD TV of these power supply circuits can further reduce power consumption.
Accompanying drawing explanation
Figure 1A shows the schematic diagram of part power supply circuits in correlation technique;
Figure 1B shows the schematic diagram of the driving circuit section of power supply circuits in correlation technique;
Fig. 2 shows according to the block diagram of the power supply circuits of an embodiment of the present utility model;
Fig. 3 shows according to the schematic diagram of the power supply circuits of another embodiment of the present utility model;
Fig. 4 shows according to the oscillogram of the corresponding signal relating in the power supply circuits of embodiment of the present utility model;
Fig. 5 shows according to the schematic diagram of the power supply circuits of another embodiment of the present utility model.
Embodiment
In order more clearly to understand above-mentioned purpose of the present utility model, feature and advantage, below in conjunction with the drawings and specific embodiments, the utility model is further described in detail.It should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
A lot of details have been set forth in the following description so that fully understand the utility model, but, the utility model can also adopt other to be different from other modes described here and implement, and therefore, the utility model is not limited to the restriction of following public specific embodiment.
Fig. 2 shows according to the block diagram of the power supply circuits of embodiment of the present utility model.
As shown in Figure 2, according to the power supply circuits 200 of embodiment of the present utility model, can comprise: power conversion circuit 202, transformer 204, the first output circuit 208, constant current feedback control circuit 206 and sample circuit 210.In Fig. 2, simply illustrated to only have the situation of a load, a constant current feedback control circuit and a sample circuit, it will be understood by those skilled in the art that, load in these power supply circuits on the first transmission of electricity circuit can also have multiple, for each load, there is corresponding constant current feedback control circuit to control the stable of electric current in this load.
Particularly, power conversion circuit 202 is connected to transformer 204, receives from outside direct current, described direct current is transformed into alternating current, and exports described alternating current to transformer 204; This transformer 204 is connected to the first output circuit 208, and the voltage of alternating current is coupled, and to described the first output circuit 208, exports the first voltage;
The first output circuit 208 receives described the first voltage, and to the load supplying on this first output circuit 208; Sample circuit 210, corresponding with described load, for obtaining the electric current in load; Constant current feedback control circuit 206, is connected between the output of load and the sample circuit corresponding to described load, obtains the sample rate current that flows through described sample circuit, according to the connecting and disconnecting of the circuit between load described in described sample rate current control and described sample circuit.
In these power supply circuits, by constant current feedback control circuit, the electric current of the load on the first output circuit is controlled, thereby obtain specified direct current, these power supply circuits have saved BOOST booster circuit and the related peripheral device of original power supply circuits, thereby simplified the structure of power supply circuits, and in these power supply circuits, only have one-level power conversion, therefore more original two stage power translation circuit its reduced power loss.
At one, preferably in execution mode, this power conversion circuit 202 can be LC resonant circuit.As shown in Figure 3, power conversion circuit 202 receives direct current input and the alternating current being converted to is inputed to transformer T21(is the transformer 204 in Fig. 2), after coupling through transformer T21, output two-way voltage (being V01 and V02) generates direct current by current rectifying and wave filtering circuit on each road output circuit.When these power supply circuits are used in LCD TV, this V02 is provided for the lamp bar of LCD TV, and V01 is provided for the mainboard of LCD TV.
In conjunction with referring to figs. 2 and 3, the sample circuit 210 in Fig. 2 is the resistance R 21 in Fig. 3.Constant current feedback control circuit 206 in Fig. 2 can comprise: constant-current controller 2062 and switching circuit 2064, and load output is connected with the sample circuit corresponding to load by described switching circuit, wherein,
Constant-current controller 2062, be connected with the sample circuit of described switching circuit 2064 and described load, according to described sample rate current 210, to the variable constant current control signal of described switching circuit 2064 output duty cycles, wherein, described constant current control signal is the fixing square-wave signal of amplitude;
Described switching circuit 2064, receives the constant current control signal from described constant-current controller 2062, based on the break-make of circuit between load described in the control of described constant current control signal and described sample circuit.
In Fig. 3, constant-current controller 2062 is PDM keyer.Switching circuit 2064 is the voltage driven type switching devices such as field-effect transistor V22, should be understood that this switching circuit 2064 can also be the current drive-type switching devices such as triode herein.
Preferably, according to power supply circuits of the present utility model, can also comprise:
The second output circuit 212, is connected to transformer 204, receives from the second voltage of transformer 204, and to the load supplying on the second output circuit 212; Not shown in constant-voltage controller 214(Fig. 2, can be with reference to figure 3), be connected to power conversion circuit, according to the output voltage of the second output circuit 212 to power conversion circuit output drive signal.When power supply circuits application and LCD TV, the Voltage-output of this second output circuit, to the mainboard of LCD TV, has been realized the integration of main board power supply and the power supply of lamp bar.
In the present embodiment, in order to obtain specified LED lamp bar electric current, can take following measures to Vo2: the maximum voltage value that the magnitude of voltage of Vo2 is set as to LED lamp bar, during so direct driving LED lamp bar, lamp bar electric current is greater than set point certainly, detect the electric current of sample resistance R21, constant-current controller 2062 carrys out the break-make of control switch circuit 2064 according to high-frequency controling signal of this detection electric current generation, make the mean value of the electric current flowing through on sample resistance R21 for setting electric current.This high-frequency controling signal is that a kind of amplitude is fixed and the square-wave signal of variable duty ratio, and frequency is synchronizeed with power conversion circuit 202.Owing to the magnitude of voltage of Vo2 being set as to the maximum voltage value of LED lamp bar, therefore the current value of this lamp bar hypothesis is 110 milliamperes, by this high-frequency controling signal (duty ratio of this high-frequency controling signal is 91%), carry out the break-make of control switch circuit 2064, then high frequency capacitance C23 can filter the alternating component of this high-frequency current, and the flip-flop of this high-frequency current is 100 milliamperes of the rated current (110 milliamperes × 91%=100 milliampere) of lamp bar, by regulating the duty ratio of high-frequency controling signal, can regulate the electric current of lamp bar.And in existing power supply circuits a kind of employing be linear voltage-stabilizing circuit, when adjusting the electric current of LED lamp bar, it is a kind of mode of linear regulation, linear voltage-stabilizing circuit directly unnecessary voltage drop below adjustment triode or metal-oxide-semiconductor on, loss is very large, and is not suitable for the higher occasion of LED lamp bar voltage ratio.Although and another kind of power supply circuits are also on-off mode, lamp bar electric current is the square-wave form that amplitude is indefinite, duty ratio changes at any time, life-span and display effect to LED lamp have a great impact.The utility model is also on-off mode, but can make lamp bar electric current by special control mode is stable direct current, the size of the duty ratio adjustable current by by-pass cock circuit, be applicable to the higher occasion of LED lamp bar voltage ratio, reduce power loss, also realized the integration of main board power supply and backlight drive.
Comparison diagram 3 and Figure 1A, 1B are known, existing power supply circuits need BOOST circuit to carry out driving LED lamp, according to power supply circuits of the present utility model, BOOST chip in original scheme and relevant peripheral components (as the L11 in Figure 1B, D11, V11) have been saved, therefore according to the power supply circuits of embodiment of the present utility model, make the structure of power supply circuits simpler, reduced the space hold of pcb board.
As shown in Figure 3, at an also high frequency capacitance C23 in parallel of the two ends of LED lamp bar, this high frequency capacitance C23 can filter the alternating component of the high-frequency current on sample resistance R21, and the electric current on LED lamp bar is the mean value of electric current on sample resistance like this, is setting electric current.
Above-described embodiment has only been described the situation of a load, should be understood that when load is while being multiple, for each load, all has corresponding sample circuit, constant current feedback control circuit and corresponding high frequency capacitance.
Set forth the permanent flow control function according to power supply circuits of the present utility model above, these power supply circuits also have dimming function.Preferably, these power supply circuits can also comprise:
Light adjusting circuit (not shown in Fig. 3), be connected to described constant-current controller 2062, to constant-current controller 2062, export dim signal, wherein, dim signal is the adjustable square-wave signal of duty ratio, and constant-current controller 2062 inputs to switching circuit 2064 after described dim signal and described control signal are superposeed.In the present embodiment, by constant-current controller 2062, the dim signal of this light adjusting circuit is sent to switching circuit 2064, for controlling the shading value of lamp bar.This light adjusting circuit is to 2062 square wave control signals of constant-current controller, by the duty ratio of the adjustable the party's wave control signal of the devices such as slide rheostat, thereby regulates the shading value of lamp bar.It should be noted that, the effect of constant-current controller 2062 is the amplitudes for controlling lamp bar electric current, and the effect of light adjusting circuit is the shading value for regulating lamp bar.
As shown in Figure 4, waveform 402 is the waveform of lamp bar electric current, the waveform that waveform 406 is dim signal, and waveform 404 is the waveform after dim signal and high-frequency controling signal are superposeed.The waveform of this lamp bar electric current is identical with the waveform of dim signal, and when dim signal is low level, switching circuit is cut off, and the electric current of lamp bar is zero, and when dim signal is high level, switching circuit is switched on.The i.e. value relevant to the duty ratio of the high-frequency controling signal of constant-current controller of the constant current value of lamp bar, in waveform 402, the part of being retouched grey at crest place is the constant current of lamp bar.In waveform 404, the waveform of this square wave is identical with the waveform of dim signal, is the high-frequency signal of the constant current value for regulating lamp bar in each square wave.Therefore, in the present embodiment, not only obtain stable lamp bar electric current, also realized the adjustment of lamp bar shading value.
In order to obtain more accurate constant current, according in another embodiment of the present utility model, these power supply circuits can also comprise: synchronous circuit (not shown), connect constant-voltage controller and constant-current controller 2062, obtain the frequency of the driving signal of constant-voltage controller, so that the frequency of the constant current control signal that constant-current controller 2062 is exported is identical with the frequency of described driving signal.Like this, just can guarantee that the operating frequency of whole power supply circuits is consistent, can not only reduce disturbing mutually between signal, can also make constant current control more accurate.
Wherein, above-mentioned synchronous circuit can be synchrotrans.Adopt synchrotrans can further isolate primary circuit and secondary circuit, realize synchronous time and can prevent influencing each other between two-stage circuit.
Utilize the principle of above-mentioned LED lamp constant current control can realize the electric current constant current of two lamp bars and more than two lamp bar, there is very strong versatility.As shown in Figure 5, in the present embodiment, there are two lamp bars, lamp bar 502A and lamp bar 502B, each lamp bar is to there being corresponding constant current feedback control circuit (the corresponding constant-current controller 2062A of lamp bar 502A, the corresponding constant-current controller 2062B of lamp bar 502B).Each constant current feedback control circuit is to there being corresponding light adjusting circuit.Each constant current feedback control circuit can a corresponding synchronous circuit, also can share a synchronous circuit.
According to power supply circuits of the present utility model, from the scheme that originally needed two power conversion circuits, become the only scheme of a power conversion circuit of needs, promoted the conversion efficiency of whole circuit, reduced the power loss of whole circuit.By the constant current FEEDBACK CONTROL increasing, realized the integration of main board power supply and backlight drive simultaneously, increased constant-current control circuit, BOOST chip and peripheral circuit in original power supply circuits have been substituted, greatly simplified original Circuits System, reduced hardware cost, when hardware designs, can save fabric swatch design space.
According to the LCD TV of embodiment of the present utility model, comprise as the power supply circuits in above-mentioned arbitrary technical scheme, the first output circuit in described power supply circuits is connected to the LED-backlit source of LCD TV, for the power supply of LED-backlit source, the second output circuit in power supply circuits is connected to the mainboard of LCD TV, is main board power supply.
In the utility model, term " first ", " second " be only for describing object, and can not be interpreted as indication or hint relative importance.Term " multiple " refers to two or more, unless separately there is clear and definite restriction.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (11)
1. power supply circuits, is characterized in that, comprising:
Power conversion circuit, is connected to transformer, receives from outside direct current, described direct current is transformed into alternating current, and exports described alternating current to described transformer;
Described transformer, is connected to the first output circuit, and the voltage of described alternating current is coupled, and to described the first output circuit, exports the first voltage;
Described the first output circuit, receives described the first voltage, and to the load supplying on described the first output circuit;
Sample circuit, corresponding with described load, for obtaining the electric current in described load;
Constant current feedback control circuit, is connected between the output of described load and the sample circuit corresponding to described load, obtains the sample rate current that flows through described sample circuit, according to the connecting and disconnecting of the circuit between load described in described sample rate current control and described sample circuit.
2. power supply circuits according to claim 1, is characterized in that, described constant current feedback control circuit comprises constant-current controller and switching circuit, and described load output is connected with the sample circuit corresponding to described load by described switching circuit,
Wherein, described constant-current controller is connected with the sample circuit of described switching circuit and described load, according to described sample rate current, determine the duty ratio of constant current control signal, to described switching circuit output device, there is the constant current control signal of described duty ratio, wherein, described constant current control signal is the fixing square-wave signal of amplitude;
Described switching circuit receives the constant current control signal from described constant-current controller, based on the break-make of circuit between load described in the control of described constant current control signal and described sample circuit.
3. power supply circuits according to claim 2, is characterized in that, also comprise:
Light adjusting circuit, be connected to described constant-current controller, to described constant-current controller output dim signal, wherein, described dim signal is the adjustable square-wave signal of duty ratio, and described constant-current controller inputs to described switching circuit after described dim signal and described control signal are superposeed.
4. power supply circuits according to claim 2, is characterized in that, also comprise:
The second output circuit, is connected to described transformer, receives from the second voltage of described transformer, and to the load supplying on described the second output circuit;
Constant-voltage controller, is connected to described power conversion circuit, according to the output voltage of described the second output circuit to described power conversion circuit output drive signal.
5. power supply circuits according to claim 4, is characterized in that, also comprise:
Synchronous circuit, connects described constant-voltage controller and described constant-current controller, obtains the frequency of described driving signal, by the frequency of constant current control signal and the Frequency Synchronization of described driving signal of described constant-current controller output.
6. power supply circuits according to claim 5, is characterized in that, described synchronous circuit is synchrotrans.
7. power supply circuits according to claim 2, is characterized in that, described constant-current controller is PDM keyer.
8. power supply circuits according to claim 2, is characterized in that, described switching circuit comprise following at least one: triode, field-effect transistor.
9. according to the power supply circuits described in any one in claim 1 to 8, it is characterized in that, described load has N, and described N is more than or equal to 2 integer, and corresponding each load has corresponding sample circuit and constant current feedback control circuit.
10. power supply circuits according to claim 9, is characterized in that, also comprise:
Multiple electric capacity, corresponding with N load, each electric capacity is in parallel with a load in a described N load, for filtering the alternating current that flows through described sample circuit.
11. 1 kinds of LCD TV, is characterized in that, comprise the power supply circuits as described in any one in claim 1 to 10, and the first output circuit in described power supply circuits is connected to the LED-backlit source of described LCD TV, are the power supply of described LED-backlit source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320724565.5U CN203554294U (en) | 2013-11-15 | 2013-11-15 | Power supply circuit and LCD television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320724565.5U CN203554294U (en) | 2013-11-15 | 2013-11-15 | Power supply circuit and LCD television |
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| CN203554294U true CN203554294U (en) | 2014-04-16 |
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| CN201320724565.5U Withdrawn - After Issue CN203554294U (en) | 2013-11-15 | 2013-11-15 | Power supply circuit and LCD television |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560673A (en) * | 2013-11-15 | 2014-02-05 | 青岛海信电器股份有限公司 | Power supply circuit and liquid crystal display television |
| CN104243876A (en) * | 2014-09-17 | 2014-12-24 | 广州视源电子科技股份有限公司 | Low-power-consumption constant current control circuit and television |
| CN104253954A (en) * | 2014-09-17 | 2014-12-31 | 广州视源电子科技股份有限公司 | Low-power-consumption constant-current and backlight control circuit and television |
| CN104253957A (en) * | 2014-09-17 | 2014-12-31 | 广州视源电子科技股份有限公司 | Low-power-consumption constant-current and backlight control circuit and television |
-
2013
- 2013-11-15 CN CN201320724565.5U patent/CN203554294U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560673A (en) * | 2013-11-15 | 2014-02-05 | 青岛海信电器股份有限公司 | Power supply circuit and liquid crystal display television |
| CN103560673B (en) * | 2013-11-15 | 2017-03-22 | 青岛海信电器股份有限公司 | Power supply circuit and liquid crystal display television |
| CN104243876A (en) * | 2014-09-17 | 2014-12-24 | 广州视源电子科技股份有限公司 | Low-power-consumption constant current control circuit and television |
| CN104253954A (en) * | 2014-09-17 | 2014-12-31 | 广州视源电子科技股份有限公司 | Low-power-consumption constant-current and backlight control circuit and television |
| CN104253957A (en) * | 2014-09-17 | 2014-12-31 | 广州视源电子科技股份有限公司 | Low-power-consumption constant-current and backlight control circuit and television |
| CN104253957B (en) * | 2014-09-17 | 2017-09-29 | 广州视源电子科技股份有限公司 | The constant current of low-power consumption and backlight control circuit and television set |
| CN104253954B (en) * | 2014-09-17 | 2017-11-03 | 广州视源电子科技股份有限公司 | The constant current of low-power consumption and backlight control circuit and television set |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140416 Effective date of abandoning: 20170322 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |