CN202940727U - Power supply circuit and liquid crystal display television - Google Patents
Power supply circuit and liquid crystal display television Download PDFInfo
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- CN202940727U CN202940727U CN201220598380XU CN201220598380U CN202940727U CN 202940727 U CN202940727 U CN 202940727U CN 201220598380X U CN201220598380X U CN 201220598380XU CN 201220598380 U CN201220598380 U CN 201220598380U CN 202940727 U CN202940727 U CN 202940727U
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- power supply
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model provides a power supply circuit which comprises a rectification circuit, a PFC correction circuit, a flyback integrated chip, a transformer and a secondary circuit, wherein an output terminal of the rectification circuit is connected with an input terminal of the PFC correction circuit and used for receiving AC input and outputting a first direct voltage after rectification, an output terminal of the PFC correction circuit is connected with one end of a primary winding of the transformer and used for receiving the first direct voltage, carrying out power factor correction on the first direct voltage and outputting a second direct voltage to the transformer, the flyback integrated chip is connected with the other end of the primary winding of the transformer and used for controlling the transformer to output a third direct voltage, and a secondary winding of the transformer is connected with the secondary circuit and used for outputting the third direct voltage to the secondary circuit. The utility model also provides a liquid crystal display television. With such a technical scheme in the utility model, the circuit of a flyback part of a power supply is simplified, so system cost is reduced.
Description
Technical field
The utility model relates to power technique fields, in particular to a kind of power supply circuits and a kind of LCD TV.
Background technology
As shown in Figure 1, the power supply circuits of traditional LED LCD TV are by current rectifying and wave filtering circuit 102, PFC(Power Factor Correction, power factor correction) circuit module 104, controller 106, mains switch 108, transformer 110, secondary circuit 112 form, wherein, controller 106 and mains switch 108 have consisted of circuit of reversed excitation.
The defective of prior art scheme is: the framework that its circuit of reversed excitation has adopted controller to separate with mains switch, and because controller works long hours, also need to add radiator, so needed cost is higher.
Therefore, need a kind of new power supply circuits, can simplify the anti-circuit that swashs part, the anti-device that swashs part is become simply, reduce the cost of system.
The utility model content
In order one of to solve the problems of the technologies described above at least, the utility model provides a kind of power supply circuits, has simplified the anti-circuit that swashs part, and the anti-device that swashs part is become simply, the cost of reduction system.
In view of this, the utility model provides a kind of power supply circuits, comprise rectification circuit, PFC correcting circuit, anti-sharp integrated chip, transformer and secondary circuit, wherein, the output of described rectification circuit is connected to the input of described PFC correcting circuit, receives to exchange input and carry out exporting the first direct voltage after rectification; The output of described PFC correcting circuit is connected to an end of the former limit winding of described transformer, receives described the first direct voltage, and described the first direct voltage is carried out power factor correction, and output the second direct voltage is to described transformer; The described anti-other end that integrated chip is connected to the former limit winding of described transformer that swashs is controlled the 3rd direct voltage that described transformer is exported; The secondary winding of described transformer is connected to described secondary circuit, with described the 3rd direct voltage output to described secondary circuit.
In this technical scheme, owing to adopting the PFC correcting circuit that the first direct voltage is proofreaied and correct, the voltage ratio after correction is higher, thus the power output that only needs less electric current to obtain wanting, therefore to transistorized require little a lot.So it is integrated that the technical program is carried out the controller in conventional solution and mains switch, consist of the anti-integrated chip that swashs, instead swash integrated chip and satisfying on the basis of power requirement, simplified the anti-circuit that swashs part, reduced the cost of system.
In technique scheme, preferably, described anti-sharp integrated chip comprises controller and mains switch, described controller is connected to described mains switch and described PFC correcting circuit, described mains switch is connected to the former limit winding of described transformer, described controller transmits control signal to described mains switch, controls the break-make of described mains switch, to regulate described the 3rd direct voltage of described transformer output.
In technique scheme, preferably, can also comprise: feedback unit, the input of described feedback unit is connected to the output of described secondary circuit, the output of described feedback unit is connected to described controller, output dc voltage and the error signal between reference voltage value of described secondary circuit are fed back to described controller, to control the switching frequency of described mains switch.
In technique scheme, preferably, described feedback unit comprises testing circuit, voltage-stabiliser tube and photoelectrical coupler, wherein, the input of described testing circuit is connected to the output of described secondary circuit, the output of described testing circuit is connected to described optical coupler, detecting the output dc voltage of described secondary circuit and described reference voltage value that described voltage-stabiliser tube provides compares, export described error signal, described photoelectrical coupler is connected to described controller, and described error signal is transferred to described controller.Described mains switch comprises transistor.
In technique scheme, preferably, described PFC correcting circuit comprises control unit, switch element and voltage transformation unit, one end of the former limit winding of described voltage transformation unit is connected to the output of described rectification circuit, other end ground connection after described switch element of the former limit winding of described voltage transformation unit, described control unit is connected to described voltage transformation unit and described switch element, controls the switching frequency of described switch element, to regulate described second direct voltage of described voltage transformation unit output.Described switch element can comprise transistor.
After the PFC correcting circuit was to power factor correction, its output voltage had improved the anti-voltage that swashs input, thereby has made in the situation that power output is identical much larger than input voltage, and the required electric current of circuit reduces; In the situation that electric current is identical, improved the power output of system.
In above-mentioned arbitrary technical scheme, preferred, described secondary circuit comprises the first output circuit and the second output circuit.
In technique scheme, preferred, described the first output circuit and described the second output circuit include diode.
According on the other hand of the present utility model, a kind of LCD TV also is provided, comprise the power supply circuits described in above-mentioned arbitrary technical scheme, the first output circuit in described power supply circuits is connected to the mainboard of described LCD TV, and the second output circuit in described power supply circuits is connected to the backlight of described LCD TV by booster circuit.
Pass through the technical solution of the utility model, carry out the controller in conventional solution and switching circuit transistor modular integrated, consist of the anti-integrated chip that swashs, anti-sharp integrated chip is satisfying on the basis of power requirement, simplified the anti-circuit that swashs part, thereby reduced the cost of system, increased the reliability of system.
Description of drawings
Fig. 1 shows the structured flowchart of traditional power supply circuits;
Fig. 2 shows the structured flowchart according to the power supply circuits of embodiment of the present utility model;
Fig. 3 shows the circuit diagram according to the PFC correcting circuit of embodiment of the present utility model;
Fig. 4 shows the circuit diagram according to the circuit of reversed excitation of embodiment of the present utility model;
Fig. 5 shows the current waveform figure according to the mains switch of embodiment of the present utility model;
Fig. 6 shows the voltage oscillogram according to the mains switch of embodiment of the present utility model;
Fig. 7 shows the circuit diagram according to the feedback unit of 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.Need to prove, in the situation that do not conflict, the application's embodiment and the feature in embodiment can make up 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 the structured flowchart according to the power supply circuits of embodiment of the present utility model.
As shown in Figure 2, comprise according to the power supply circuits 200 of embodiment of the present utility model: rectification circuit 202, PFC correcting circuit 204, anti-sharp integrated chip 206, transformer 208 and secondary circuit 210, wherein, the output of rectification circuit 202 input that is connected to described PFC correcting circuit 204 is used for receiving exchanging and input and carry out exporting the first direct voltage after rectification; The output of rectification circuit 202 also is connected to the anti-integrated chip 206 that swashs, for it provides operating voltage; The output of PFC correcting circuit 204 is connected to an end of the former limit winding of transformer 208, receives described the first direct voltage, and described the first direct voltage is carried out power factor correction, and output the second direct voltage is to described transformer 208; The described anti-other end that integrated chip 206 is connected to the former limit winding of transformer 208 that swashs is controlled the 3rd direct voltage that described transformer 208 is exported; The secondary winding of this transformer 208 is connected to described secondary circuit 210, with described the 3rd direct voltage output to described secondary circuit 210.Anti-sharp integrated chip 206 comprises controller and mains switch, controller is connected to described mains switch and described PFC correcting circuit, mains switch is connected to the former limit winding of described transformer, described controller transmits control signal to described mains switch, control the break-make of described mains switch, to regulate the 3rd direct voltage of described transformer output.
In Fig. 2, power supply circuits 200 can also comprise feedback unit 212, the input of feedback unit 212 is connected to the output of secondary circuit 210, the output of this feedback unit 212 is connected to the described anti-controller that swashs in integrated chip 206, output dc voltage and the error signal between reference voltage value of described secondary circuit 210 are fed back to described controller, to control the switching frequency of described mains switch.
Owing to adopting the PFC correcting circuit that the first direct voltage is proofreaied and correct, the voltage ratio after correction is higher, thus the power output that only needs less electric current to obtain wanting, therefore to transistorized require little a lot.So the technical program is carried out the controller in conventional solution and mains switch integrated, consist of the anti-integrated chip that swashs, anti-sharp integrated chip is satisfying on the basis of power requirement, simplify the anti-circuit that swashs part, reduced the cost of system, increased the reliability of system, and due to the Limited Current of transistorized peak current less than chip, reduce heating, therefore, need not radiator.
Fig. 3 shows the circuit diagram according to the PFC correcting circuit of embodiment of the present utility model.
a preferred embodiment of PFC correcting circuit of the present utility model, as shown in Figure 3, PFC correcting circuit 300 comprises: control unit 302, switch element 304 and voltage transformation unit 306, one end of the former limit winding of described voltage transformation unit 306 is connected to the output of described rectification circuit 202, the other end of the former limit winding of voltage transformation unit 306 ground connection after described switch element 304, control unit 302 is connected to described voltage transformation unit 306 and switch element 304, control the switching frequency of described switch element 304, to regulate described second direct voltage of described voltage transformation unit 306 outputs.After the PFC correcting circuit was to power factor correction, its output voltage (400V) had improved the anti-voltage that swashs input, thereby has made in the situation that power output is identical much larger than input voltage (300V), and the required electric current of circuit reduces; In the situation that electric current is identical, improved the power output of system.
Fig. 4 shows the circuit diagram according to the circuit of reversed excitation of embodiment of the present utility model.
a preferred embodiment of circuit of reversed excitation of the present utility model, as shown in Figure 4, anti-sharp integrated chip 206 comprises controller and mains switch (not shown in Fig. 4), controller is connected to described mains switch, rectification circuit 202 and described PFC correcting circuit 204, described mains switch is connected to the former limit winding of described transformer 208, described controller transmits control signal to described mains switch, control the break-make of mains switch, to regulate described the 3rd direct voltage of described transformer 208 outputs, described rectification circuit 202 provides its work required voltage to controller.
Wherein, PFC transfers energy to secondary circuit as the anti-input voltage that swashs through transformer 208, and described secondary circuit 210 comprises the first output circuit and the second output circuit; the first output circuit and described the second output circuit include diode, protect by the diode pair circuit.Such as when this scheme is applied in LCD TV, the first output circuit in described power supply circuits can be connected to the mainboard 404 of described LCD TV, and the second output circuit in described power supply circuits can be connected to by booster circuit the backlight 402 of described LCD TV.At this moment, when anti-5 pin that swash integrated chip 206 were opened, the electric current of PFC flow to chip internal through the inductance of transformer 208, and this moment, transformer inductance obtained energy storage.When anti-5 pin that swash integrated chip 206 were closed, the energy of transformer inductance was given respectively mainboard 404 and backlight 402 through two rectifier diodes, and mainboard 404 is given the anti-feedback of integrated chip that swashs, to guarantee the stability of output voltage.Mains switch comprises transistor, consider mains switch voltage and current peak value all in the peak limiting scope of controller (as shown in Figure 5, transistorized sustained ceiling current is in the 1.3A left and right, and the Limited Current of controller is 1.7A, in the scope that controller allows.As shown in Figure 6, transistorized drain-source voltage maximum is 580V, and the withstand voltage of controller is 650V, and therefore transistorized drain-source voltage is in the scope that controller allows), thus controller and mains switch is integrated, consist of the anti-integrated chip that swashs.Because the operational environment of mains switch is in the number range of its permission, so controller fever phenomenon can not occur, so do not need to use radiator.Like this, the area of printed circuit board (PCB) has just reduced, and peripheral components also reduces accordingly, so reduced the cost of system, has also increased the reliability of system simultaneously.
Fig. 7 shows the circuit diagram according to the feedback unit of embodiment of the present utility model.As shown in Figure 7, feedback unit 212 roughly can comprise testing circuit (resistance R 1, resistance R 3 and resistance R 4 consist of testing circuit), voltage-stabiliser tube U3 and photoelectrical coupler U2, wherein, the input of described testing circuit is connected to the output of secondary circuit 210, the output of testing circuit is connected to optical coupler U2, detecting the output dc voltage of secondary circuit 210 and the described reference voltage value that described voltage-stabiliser tube U3 provides compares, export described error signal, photoelectrical coupler U2 is connected to controller, and described error signal is transferred to described controller.
In this technical scheme, feedback unit 212 feeds back to controller with the information of secondary circuit output, and controller is controlled the break-make of mains switch according to feedback result, thereby regulates the output voltage of transformer, guarantees the stable of output voltage.
Above-mentioned power supply circuits can be applicable to all the LED LCD TV with pfc circuit.The first output circuit in power supply circuits can be connected to the mainboard of LCD TV, and the second output circuit in power supply circuits can be connected to the backlight of LCD TV by booster circuit.
More than be described with reference to the accompanying drawings the technical solution of the utility model, pass through the technical solution of the utility model, carry out the controller in conventional solution and switching circuit transistor modular integrated, consist of the anti-integrated chip that swashs, anti-sharp integrated chip is satisfying on the basis of power requirement, simplify the anti-circuit that swashs part, thereby reduced the cost of system, increased the reliability of system.
In the utility model, term " first ", " second " only are used for describing purpose, and can not be interpreted as indication or hint relative importance.Term " a plurality of " refers to two or more, unless clear and definite restriction is separately arranged.
The above is only preferred embodiment of the present utility model, is not limited to the utility model, and 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 (10)
1. power supply circuits, is characterized in that, comprise rectification circuit, PFC correcting circuit, instead swash integrated chip, transformer and secondary circuit, wherein,
The output of described rectification circuit is connected to the input of described PFC correcting circuit, receives to exchange input and carry out exporting the first direct voltage after rectification;
The output of described PFC correcting circuit is connected to an end of the former limit winding of described transformer, receives described the first direct voltage, and described the first direct voltage is carried out power factor correction, and output the second direct voltage is to described transformer;
The described anti-other end that integrated chip is connected to the former limit winding of described transformer that swashs is controlled the 3rd direct voltage that described transformer is exported;
The secondary winding of described transformer is connected to described secondary circuit, with described the 3rd direct voltage output to described secondary circuit.
2. power supply circuits according to claim 1, it is characterized in that, described anti-sharp integrated chip comprises controller and mains switch, described controller is connected to described mains switch and described PFC correcting circuit, described mains switch is connected to the former limit winding of described transformer, described controller transmits control signal to described mains switch, controls the break-make of described mains switch, to regulate described the 3rd direct voltage of described transformer output.
3. power supply circuits according to claim 2, it is characterized in that, also comprise: feedback unit, the input of described feedback unit is connected to the output of described secondary circuit, the output of described feedback unit is connected to described controller, output dc voltage and the error signal between reference voltage value of described secondary circuit are fed back to described controller, to control the switching frequency of described mains switch.
4. power supply circuits according to claim 3, it is characterized in that, described feedback unit comprises testing circuit, voltage-stabiliser tube and photoelectrical coupler, wherein, the input of described testing circuit is connected to the output of described secondary circuit, the output of described testing circuit is connected to described optical coupler, detecting the output dc voltage of described secondary circuit and described reference voltage value that described voltage-stabiliser tube provides compares, export described error signal, described photoelectrical coupler is connected to described controller, and described error signal is transferred to described controller.
5. power supply circuits according to claim 2, is characterized in that, described mains switch comprises transistor.
6. power supply circuits according to claim 1, it is characterized in that, described PFC correcting circuit comprises control unit, switch element and voltage transformation unit, one end of the former limit winding of described voltage transformation unit is connected to the output of described rectification circuit, other end ground connection after described switch element of the former limit winding of described voltage transformation unit, described control unit is connected to described voltage transformation unit and described switch element, control the switching frequency of described switch element, to regulate described second direct voltage of described voltage transformation unit output.
7. power supply circuits according to claim 6, is characterized in that, described switch element comprises transistor.
8. the described power supply circuits of any one according to claim 1 to 7, is characterized in that, described secondary circuit comprises the first output circuit and the second output circuit.
9. power supply circuits according to claim 8, is characterized in that, described the first output circuit and described the second output circuit include diode.
10. LCD TV, it is characterized in that, comprise power supply circuits as claimed in any one of claims 1-9 wherein, the first output circuit in described power supply circuits is connected to the mainboard of described LCD TV, and the second output circuit in described power supply circuits is connected to the backlight of described LCD TV by booster circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220598380XU CN202940727U (en) | 2012-11-13 | 2012-11-13 | Power supply circuit and liquid crystal display television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220598380XU CN202940727U (en) | 2012-11-13 | 2012-11-13 | Power supply circuit and liquid crystal display television |
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| Publication Number | Publication Date |
|---|---|
| CN202940727U true CN202940727U (en) | 2013-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220598380XU Expired - Fee Related CN202940727U (en) | 2012-11-13 | 2012-11-13 | Power supply circuit and liquid crystal display television |
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| CN (1) | CN202940727U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021185150A1 (en) * | 2020-03-18 | 2021-09-23 | 海信视像科技股份有限公司 | Display apparatus and display control method |
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- 2012-11-13 CN CN201220598380XU patent/CN202940727U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021185150A1 (en) * | 2020-03-18 | 2021-09-23 | 海信视像科技股份有限公司 | Display apparatus and display control method |
| US11783788B2 (en) | 2020-03-18 | 2023-10-10 | Hisense Visual Technology Co., Ltd. | Display apparatus and display control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130515 Termination date: 20191113 |
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| CF01 | Termination of patent right due to non-payment of annual fee |