CN202102692U - LED (light-emitting diode) drive circuit and LCD TV (liquid crystal television) - Google Patents
LED (light-emitting diode) drive circuit and LCD TV (liquid crystal television) Download PDFInfo
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- CN202102692U CN202102692U CN2011202028183U CN201120202818U CN202102692U CN 202102692 U CN202102692 U CN 202102692U CN 2011202028183 U CN2011202028183 U CN 2011202028183U CN 201120202818 U CN201120202818 U CN 201120202818U CN 202102692 U CN202102692 U CN 202102692U
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Abstract
The utility model discloses an LED (light-emitting diode) drive circuit and an LCD TV (liquid crystal television). The LED drive circuit comprises a switch transformer, a control circuit used for controlling the switch timing sequence of the switch transformer, rectifying circuits, storage capacitors, LED strips and a current sampling circuit; 2N rectifying circuits, 2N storage capacitors and 2N LED strips are equally divided into two groups and are connected with the two ends of secondary coils of the switch transformer in one-to-one correspondence, and primary coils of the switch transformer are connected with the control circuit; and cathodes of the LED strips are connected with the current sampling circuit, so as to back feed sampling values to the control circuit. In the LED drive circuit, the applied amount of components is reduced, and the optimization of the circuit architecture is realized; and meanwhile, constant-current control of the plurality of LED strips can be realized. The LED drive circuit can be applied in household appliances such as the LCD TVs and the like, so as to effectively reduce the hardware cost of a product and save the PCB (Printed Circuit Board) space of a system.
Description
Technical field
The utility model belongs to LED actuation techniques field, specifically, relates to a kind of liquid crystal TV set that is used for the Drive and Control Circuit of driving LED lamp bar light on and off and adopts said led drive circuit design.
Background technology
In present LED actuation techniques, all be to adopt transformer output galvanic current to press, offer the DC/DC on-off circuit, come driving LED lamp bar to light through DC/DC on-off circuit output steady current then.This traditional LED type of drive, each root LED lamp bar all need use one tunnel special DC/DC on-off circuit to carry out drive controlling, and this is for the large-sized liquid crystal display that requires to dispose many LED lamp bars; Just multichannel high pressure DC/DC on-off circuit need be set simultaneously on its backlight; Not only the circuit structure relative complex need take the bigger space of PCB, and because the DC/DC on-off circuit is very expensive; Therefore can cause the hardware cost of product to raise, and inefficiency.
Summary of the invention
Each root LED lamp bar need use one road DC/DC on-off circuit to carry out drive controlling to the utility model in the existing LED actuation techniques in order to solve; Cause the problem that circuit structure is complicated, cost is high thus; A kind of led drive circuit of brand new has been proposed; Optimize circuit structure, reduced hardware cost.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:
A kind of led drive circuit comprises switch transformer, is used to control control circuit, rectification circuit, storage capacitor, LED lamp bar and the current sampling circuit of the switching sequence of said switch transformer; Said rectification circuit, storage capacitor and LED lamp bar all include 2N, and N is a positive integer, is divided into two groups, and the two ends with the secondary coil of switch transformer connect one to one respectively, and the primary coil of said switch transformer connects described control circuit; In each branch road of forming by rectification circuit, storage capacitor and LED lamp bar; The input end of rectification circuit connects the secondary coil of said switch transformer; The output terminal of rectification circuit is connected with the positive pole of storage capacitor with LED lamp bar respectively, and the negative pole of LED lamp bar connects described current sampling circuit; Said current sampling circuit feedback sample value to described control circuit.
Further, in each described rectification circuit, all include a commutation diode, the anode of said commutation diode connects the secondary coil of switch transformer, and negative electrode connects the positive pole of said storage capacitor and LED lamp bar.
Further again, the anode of said each commutation diode connects the negative electrode of an other diode respectively, the plus earth of said diode.
Preferably; Said current sampling circuit preferably adopts sampling resistor to carry out circuit design, and an end of said sampling resistor is connected other end ground connection with the negative pole of 2N LED lamp bar respectively; The total current that will flow through 2N LED lamp bar converts the voltage sample value to, feeds back to described control circuit.
A kind of preferred design as said control circuit includes processor, isolating transformer and on-off circuit in said control circuit; The sampled value of said processor received current sample circuit feedback; And then generation two path control signal correspondence transfers to two push-pull circuits; And the two ends of the primary coil through two push-pull circuits and isolating transformer connect one to one; The secondary coil output of said isolating transformer is used to control the control voltage of said on-off circuit break-make; Transfer to described on-off circuit, said on-off circuit connects the primary coil of switch transformer, controls the switching sequence of said switch transformer through the break-make of CS circuit.
Further, in the connection line of the primary coil of said isolating transformer and two push-pull circuits, also be in series with capacitance.
Further again; In said on-off circuit, include two N-channel MOS pipes; Said isolating transformer comprises two secondary coils, and the end of the same name of first secondary coil connects the grid of first metal-oxide-semiconductor through mu balanced circuit, and the drain electrode of first metal-oxide-semiconductor connects high-voltage DC power supply; Source electrode connects the end of the same name of the primary coil of said switch transformer on the one hand through electric capacity, be connected with the different name end of first secondary coil of said isolating transformer and the drain electrode of second metal-oxide-semiconductor respectively on the other hand; The different name end of the second subprime coil of said isolating transformer connects the grid of second metal-oxide-semiconductor through mu balanced circuit, and the source electrode of second metal-oxide-semiconductor is connected with the end of the same name of the second subprime coil of the different name end of the primary coil of said switch transformer and said isolating transformer respectively.
Further again, in the described mu balanced circuit of two-way, all include a voltage stabilizing diode, its negative electrode connects the secondary coil of said isolating transformer, and anode connects the grid of said metal-oxide-semiconductor.
Further, at the two ends of said voltage stabilizing diode and be connected with coupling capacitance.
Based on above-mentioned led drive circuit structure; The utility model provides a kind of liquid crystal TV set that adopts said led drive circuit design again; Comprise power module and LCDs; In said LCDs, be provided with LED lamp bar, in said televisor, also be provided with switch transformer, be used to control control circuit, rectification circuit, storage capacitor and the current sampling circuit of the switching sequence of said switch transformer; Said rectification circuit, storage capacitor and LED lamp bar all include 2N, and N is a positive integer, is divided into two groups, and the two ends with the secondary coil of switch transformer connect one to one respectively, and the primary coil of said switch transformer connects described control circuit; In each branch road of forming by rectification circuit, storage capacitor and LED lamp bar; The input end of rectification circuit connects the secondary coil of said switch transformer; The output terminal of rectification circuit is connected with the positive pole of storage capacitor with LED lamp bar respectively, and the negative pole of LED lamp bar connects described current sampling circuit; Said current sampling circuit feedback sample value to described control circuit.Through the switching frequency of control circuit CS transformer, and then the by-pass cock transformer exports the amplitude of the DC voltage of LED lamp bar to, reaches the purpose of design of keeping the LED lamp bar current constant of flowing through.
Compared with prior art; The advantage and the good effect of the utility model are: the led drive circuit of the utility model only utilizes the transformer in traditional LED actuation techniques can realize the drive controlling to many LED lamp bars with the control circuit that is used for the switching sequence of control transformer; Thereby effectively reduce the complexity of circuit design, can realize constant current control simultaneously many LED lamp bars.Said led drive circuit is applied to effectively to reduce the hardware cost of product in the household appliances such as liquid crystal TV set, practices thrift the PCB space of system, make things convenient for the global design of circuit system.
After the detailed description in conjunction with advantages the utility model embodiment, other characteristics of the utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams of a kind of embodiment of the led drive circuit that proposes of the utility model;
Fig. 2 is the circuit theory diagrams of a kind of embodiment of control circuit among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done explanation in further detail.
Embodiment one; Present embodiment is an example with the LCD TV product; Design a kind of led drive circuit to the inner LED lamp bar of laying of its LCDs,, reach simultaneously purpose of design many LED lamp bar constant-current driving to be implemented under the prerequisite that does not rely on traditional DC/DC on-off circuit.
Referring to shown in Figure 1; The led drive circuit of present embodiment needs the inner power module of televisor to provide the required primary source of switch transformer T967 (such as the high-voltage DC power supply through PFC output; Usually about 380V) and be used to control the required working power of control circuit of the switching sequence of said switch transformer T967, for example+low-voltage dc power supply of 5.6V etc.Said control circuit is connected the elementary of switch transformer T967, the switching sequence of the primary coil through changing switch transformer T967, and then reach the purpose of the voltage magnitude that the secondary coil of by-pass cock transformer T967 exports.Utilizing the voltage of switch transformer T967 conversion output to be used for the DC voltage that driving LED lamp bar is lighted through direct generation of rectification circuit, is the power supply of LED lamp bar.In order to realize the constant current control to LED multi-path lamp bar, present embodiment is symmetrical rectification circuit and the storage capacitor that is used to generate the required DC voltage of LED lamp bar of laying at the two ends of the secondary coil of switch transformer T967, to reach current balance type.Illustrate: if on the backlight of liquid crystal TV set, lay 2N LED lamp bar, 2N rectification circuit and storage capacitor need be set then, said N is a positive integer.In order to make electric current reach balance; The end of the same name that the input end of first group a N rectification circuit is connected the secondary coil of switch transformer T967; The output terminal of a said N rectification circuit is connected the minus earth of a said N storage capacitor with the positive pole of N storage capacitor and the positive pole of N LED lamp bar respectively; The different name end that the input end of second group a N rectification circuit is connected the secondary coil of switch transformer T967; The output terminal of said second a group N rectification circuit is connected the minus earth of a described other N storage capacitor with the positive pole anodal and N LED lamp bar in addition of an other N storage capacitor respectively.Connect current sampling circuit at the negative pole of 2N LED lamp bar, cross the total current of 2N LED lamp bar through said current sampling circuit acquisition stream, and feedback sample value described control circuit extremely.Said control circuit is according to the switching frequency of the sampled value by-pass cock transformer T967 that receives; And then change is through the voltage magnitude of the secondary output of switch transformer T967; Export the DC voltage of LED lamp bar to through change, reach the purpose of design of keeping the LED lamp bar current constant of flowing through.
With N=2 is that example specifies; As shown in Figure 1; When needs drive 4 LED lamp bar LED1-LED4,4 rectification circuits (with commutation diode VD705, VD701, VD702, VD703) and 4 storage capacitor C708, C721, C717, C713 need be set.Wherein, The anode of commutation diode VD705, VD703 connects the end of the same name of switch transformer T967 secondary coil; The negative electrode of commutation diode VD705 connects the positive pole of storage capacitor C708 and the anodal LED1+ of LED1 lamp bar, and the negative electrode of commutation diode VD703 connects the positive pole of storage capacitor C717 and the anodal LED3+ of LED3 lamp bar; The anode of commutation diode VD701, VD702 connects the different name end of switch transformer T967 secondary coil; The negative electrode of commutation diode VD701 connects the positive pole of storage capacitor C721 and the anodal LED2+ of LED2 lamp bar, and the negative electrode of commutation diode VD702 connects the positive pole of storage capacitor C713 and the anodal LED4+ of LED4 lamp bar.The negative pole LED1-to LED4-of 4 LED lamp bar LED1-LED4 is through current sampling circuit ground connection.In the present embodiment; Can adopt sampling resistor R708, the R704 of two parallel connections to constitute described current sampling circuit; Convert the total current of the 4 LED lamp bar LED1-LED4 that flow through to magnitude of voltage, through resistance R 705, R711 feedback sample value ISEN to described control circuit.When the alternating voltage of the output of the secondary coil through switch transformer T967 is in positive half cycle, be storage capacitor C708, C717 charging through commutation diode VD705, VD703 rectification output forward dc voltage, and drive lamp bar LED1, LED3 lights; When the alternating voltage of exporting through the secondary coil of switch transformer T967 is in negative half period; Storage capacitor C708, C717 discharge; Keep lamp bar LED1, LED3 continues to light; And at this moment, be storage capacitor C721, C713 charging through commutation diode VD701, VD702 rectification output forward dc voltage, and drive lamp bar LED2, LED4 lights.Said storage capacitor C721, C713 discharge when the alternating voltage of the secondary coil output of switch transformer T967 is in positive half cycle, keep lamp bar LED2, LED4 continues to light.
In each rectification circuit, another one diode VD709, VD708, VD707, VD706 can also be set further; As shown in Figure 1; Its negative electrode connects one to one plus earth with the anode of commutation diode VD705, VD701, VD702, VD703 respectively.
The sampled value ISEN that said control circuit basis receives comes the switching sequence of by-pass cock transformer T967, specifically can adopt processor, isolating transformer T962 and on-off circuit design to realize, and is as shown in Figure 2.For liquid crystal TV set; Said processor can specifically be selected the master chip on the televisor decoding deck for use; Sampled value ISEN according to feedback generates two path control signal DRV1, DRV2; Export the two-way push-pull circuit that is connected isolating transformer T962 primary coil two ends respectively to, after push-pull circuit carries out power amplification, realize drive controlling isolating transformer T962.Secondary coil through isolating transformer T962 is exported the control voltage that is used for the CS connecting and disconnecting of the circuit, reaches the purpose of design of the switching frequency of regulating said switch transformer T967 through the break-make of CS circuit.
The capacitance C704 that in the primary coil line of said two-way push-pull circuit (being formed by connecting triode V927/V928, V701/V703 respectively) and isolating transformer T962, can also further connect, the flip-flop in the filtering isolating transformer T962 primary source.
In the present embodiment, said on-off circuit can adopt two N-channel MOS pipe V701, V702 to carry out circuit design, and is as shown in Figure 2.Secondary two secondary coil T1, the T2 of being provided with at isolating transformer T962; Wherein, The end of the same name of the first secondary coil T1 connects the grid of the first metal-oxide-semiconductor V701 through mu balanced circuit; The drain electrode of the first metal-oxide-semiconductor V701 connects high-voltage DC power supply (can specifically be provided by the output of the PFC on the TV set power plate) through diode VD714, and source electrode is connected with the different name end of the first secondary coil T1, and connects the end of the same name of switch transformer T967 primary coil through capacitor C 709.The different name end of second subprime coil T2 connects the grid of the second metal-oxide-semiconductor V702 through mu balanced circuit; The drain electrode of the second metal-oxide-semiconductor V702 connects the source electrode of the said first metal-oxide-semiconductor V701 through diode VD715, and the source electrode of the second metal-oxide-semiconductor V702 is connected with the different name end of switch transformer T967 primary coil and the end of the same name of said second subprime coil T2 respectively.
In the present embodiment, the two-way control voltage that can specifically adopt two voltage stabilizing diode VD922, VD923 to come voltage stabilizing output to be used to control two metal-oxide-semiconductor V701, V702 saturation conduction or end, as shown in Figure 2.The negative electrode of one of them stabilivolt VD922 connects the end of the same name of the first secondary coil T1 of isolating transformer T962, and anode connects the grid of the first metal-oxide-semiconductor V701 through resistance R 920; The negative electrode of another one stabilivolt VD923 connects the different name end of the second subprime coil T2 of isolating transformer T962, and anode connects the grid of the second metal-oxide-semiconductor V702 through resistance R 716.Because it is opposite in the phase place of synchronization to act on the control voltage of two-way metal-oxide-semiconductor V701, V702, therefore, when a metal-oxide-semiconductor conducting, another metal-oxide-semiconductor is in cut-off state.When the first metal-oxide-semiconductor V701 saturation conduction, the second metal-oxide-semiconductor V702 ends, and after straight, T967 provides primary source to high-voltage DC power supply for switch transformer through capacitor C 709; When the first metal-oxide-semiconductor V701 ends; The second metal-oxide-semiconductor V702 saturation conduction; The electric charge that is stored in the capacitor C 709 is released through the second metal-oxide-semiconductor V702, and this moment, switch transformer T967 turn-offed, and had just realized the effective control to switch transformer T967 switching sequence thus; And then reach the purpose that switch transformer T967 output voltage is regulated, make the electric current of the LED lamp bar of flowing through keep constant.
In the present embodiment, can also be at the two ends of each voltage stabilizing diode VD922, VD923 parallel coupled capacitor C 721, C720, as shown in Figure 2, to remove the spike in the circuit.
The led drive circuit of the utility model has been realized to the innovation of LED actuation techniques and to the energy-conservation driving of LED lamp bar; Optimized system architecture; Reduced cost of products; Not only go for need using the electronic product of LED lamp bar for other in the present LCD TV design, the led drive circuit of the utility model is suitable equally.
Certainly; Above-mentioned explanation is not to be the restriction to the utility model; The utility model also be not limited in above-mentioned for example, variation, remodeling, interpolation or replacement that those skilled in the art are made in the essential scope of the utility model also should belong to the protection domain of the utility model.
Claims (10)
1. led drive circuit is characterized in that: comprise switch transformer, be used to control control circuit, rectification circuit, storage capacitor, LED lamp bar and the current sampling circuit of the switching sequence of said switch transformer; Said rectification circuit, storage capacitor and LED lamp bar all include 2N, and N is a positive integer, is divided into two groups, and the two ends with the secondary coil of switch transformer connect one to one respectively, and the primary coil of said switch transformer connects described control circuit; In each branch road of forming by rectification circuit, storage capacitor and LED lamp bar; The input end of rectification circuit connects the secondary coil of said switch transformer; The output terminal of rectification circuit is connected with the positive pole of storage capacitor with LED lamp bar respectively, and the negative pole of LED lamp bar connects described current sampling circuit; Said current sampling circuit feedback sample value to described control circuit.
2. led drive circuit according to claim 1; It is characterized in that: in each described rectification circuit, all include a commutation diode; The anode of said commutation diode connects the secondary coil of switch transformer, and negative electrode connects the positive pole of said storage capacitor and LED lamp bar.
3. led drive circuit according to claim 2 is characterized in that: the anode of said each commutation diode connects the negative electrode of an other diode respectively, the plus earth of said diode.
4. led drive circuit according to claim 1; It is characterized in that: in said current sampling circuit, include sampling resistor; One end of said sampling resistor is connected with the negative pole of 2N LED lamp bar respectively; Other end ground connection, the total current that will flow through 2N LED lamp bar converts the voltage sample value to, feeds back to described control circuit.
5. according to each described led drive circuit in the claim 1 to 4, it is characterized in that: in said control circuit, include processor, isolating transformer and on-off circuit; The sampled value of said processor received current sample circuit feedback; And then generation two path control signal correspondence transfers to two push-pull circuits; And the two ends of the primary coil through two push-pull circuits and isolating transformer connect one to one; The secondary coil output of said isolating transformer is used to control the control voltage of said on-off circuit break-make; Transfer to described on-off circuit, said on-off circuit connects the primary coil of switch transformer, controls the switching sequence of said switch transformer through the break-make of CS circuit.
6. led drive circuit according to claim 5 is characterized in that: in the connection line of the primary coil of said isolating transformer and two push-pull circuits, be in series with capacitance.
7. led drive circuit according to claim 5; It is characterized in that: in said on-off circuit, include two N-channel MOS pipes; Said isolating transformer comprises two secondary coils; The end of the same name of first secondary coil connects the grid of first metal-oxide-semiconductor through mu balanced circuit; The drain electrode of first metal-oxide-semiconductor connects high-voltage DC power supply, and source electrode connects the end of the same name of the primary coil of said switch transformer on the one hand through electric capacity, is connected with the different name end of first secondary coil of said isolating transformer and the drain electrode of second metal-oxide-semiconductor respectively on the other hand; The different name end of the second subprime coil of said isolating transformer connects the grid of second metal-oxide-semiconductor through mu balanced circuit, and the source electrode of second metal-oxide-semiconductor is connected with the end of the same name of the second subprime coil of the different name end of the primary coil of said switch transformer and said isolating transformer respectively.
8. led drive circuit according to claim 7 is characterized in that: in the described mu balanced circuit of two-way, all include a voltage stabilizing diode, its negative electrode connects the secondary coil of said isolating transformer, and anode connects the grid of said metal-oxide-semiconductor.
9. led drive circuit according to claim 8 is characterized in that: at the two ends of said voltage stabilizing diode and be connected with coupling capacitance.
10. a liquid crystal TV set comprises power module and LCDs, it is characterized in that: also comprise like the described led drive circuit of each claim in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202028183U CN202102692U (en) | 2011-06-16 | 2011-06-16 | LED (light-emitting diode) drive circuit and LCD TV (liquid crystal television) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202028183U CN202102692U (en) | 2011-06-16 | 2011-06-16 | LED (light-emitting diode) drive circuit and LCD TV (liquid crystal television) |
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| Publication Number | Publication Date |
|---|---|
| CN202102692U true CN202102692U (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202028183U Expired - Lifetime CN202102692U (en) | 2011-06-16 | 2011-06-16 | LED (light-emitting diode) drive circuit and LCD TV (liquid crystal television) |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014154091A1 (en) * | 2013-03-29 | 2014-10-02 | 深圳市明微电子股份有限公司 | Constant current drive controller and led constant current drive circuit |
| WO2015139437A1 (en) * | 2014-03-18 | 2015-09-24 | 深圳创维－Rgb电子有限公司 | Oled drive power supply device |
| CN109584775A (en) * | 2019-01-03 | 2019-04-05 | 合肥鑫晟光电科技有限公司 | Drive control circuit and display device |
| CN112785971A (en) * | 2020-03-18 | 2021-05-11 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| CN114144966A (en) * | 2019-07-29 | 2022-03-04 | 株式会社村田制作所 | Converter with holding circuit and surge control circuit |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
-
2011
- 2011-06-16 CN CN2011202028183U patent/CN202102692U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014154091A1 (en) * | 2013-03-29 | 2014-10-02 | 深圳市明微电子股份有限公司 | Constant current drive controller and led constant current drive circuit |
| WO2015139437A1 (en) * | 2014-03-18 | 2015-09-24 | 深圳创维－Rgb电子有限公司 | Oled drive power supply device |
| CN109584775A (en) * | 2019-01-03 | 2019-04-05 | 合肥鑫晟光电科技有限公司 | Drive control circuit and display device |
| CN114144966A (en) * | 2019-07-29 | 2022-03-04 | 株式会社村田制作所 | Converter with holding circuit and surge control circuit |
| CN112785971A (en) * | 2020-03-18 | 2021-05-11 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| CN112785971B (en) * | 2020-03-18 | 2022-03-18 | 海信视像科技股份有限公司 | Display device and negative-pressure step power supply circuit |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
| US11825577B2 (en) | 2020-08-24 | 2023-11-21 | Hisense Visual Technology Co., Ltd. | Display apparatus and step power circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co., Ltd Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |
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| CX01 | Expiry of patent term |