CN201039336Y - Low-voltage/high current power supply circuit and video device with this circuit - Google Patents
Low-voltage/high current power supply circuit and video device with this circuit Download PDFInfo
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- CN201039336Y CN201039336Y CNU2007200222233U CN200720022223U CN201039336Y CN 201039336 Y CN201039336 Y CN 201039336Y CN U2007200222233 U CNU2007200222233 U CN U2007200222233U CN 200720022223 U CN200720022223 U CN 200720022223U CN 201039336 Y CN201039336 Y CN 201039336Y
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- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 abstract description 6
- 230000002093 peripheral effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 2
- 241001282153 Scopelogadus mizolepis Species 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The utility model discloses a power source circuit with a low voltage and a high current and a video apparatus with a power source circuit. The utility model comprises a power source inputting end, a power source outputting end and a switch voltage stabilizing chip. An inputting end of the switch voltage stabilizing chip is connected with the power source inputting end and is connected with a power supplying power source through the power source inputting end; an outputting end of the switch voltage stabilizing chip outputs the converted direct current voltage and is connected with a feedback end of the switch voltage stabilizing chip through a voltage dividing circuit. The power source circuit of the utility model is simple in structure and low in cost, which can realize the stable outputting of the power source with the low voltage and the high current through that a sheet of switch voltage stabilizing chip matches a simple peripheral circuit, effectively solves the problem that the big-scale integrating circuit in the video apparatus system needs a large drive current, being beneficial to the whole design of the circuit system of video apparatus, convenient to the adding of various external interfaces, and having market competence on performance and function.
Description
Technical field
The utility model belongs to the power circuit technical field, specifically, relates to the power circuit of a kind of exportable low-voltage/high electric current.
Background technology
Power circuit is one of vital hardware part in the electric equipment, the direct current supply of universal demand low voltage and high current for present home video electronic product, especially large-scale integrated circuit, the Video processing master chip FLII8668 that generally adopts on for example existing television set decoding deck just needs to adopt the direct current supply input of one road constant 1.8V/3A, to satisfy its work requirements.
Existing low-voltage/high current power supply circuit adopts integrated regulator to cooperate Switching Power Supply to connect usually and realizes.For common integrated regulator, general voltage stabilizing is lower, and current ratio is less, and such as the regulator block of our 78/79 familiar series, output current is usually all below 1A.And the needed drive current of video frequency processing chip is very big, generally will therefore, need re-use Switching Power Supply and promote output current about 2A.We commonly adopt switch transformer in Switching Power Supply, its secondary behind current rectifying and wave filtering circuit the output HIGH current low-voltage dc power supply.Adopt this power circuit need dispose complicated circuits such as integrated regulator, switch transformer and rectifying and wave-filtering simultaneously, the cost height, the construction cycle is long, efficient is low, is unsuitable for promoting the use of in the household appliances that market competition is growing more intense.
The utility model content
The purpose of this utility model is to provide the power circuit of a kind of low-voltage/high electric current, to solve existing power supply circuit structure complexity, problem that cost is high.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of low-voltage/high current power supply circuit and have the video equipment of described power circuit comprises power input, power output end and a switch voltage-stabilizing chip; The input of described switch voltage-stabilizing chip connects described power input, connects power supply by described power input; The output of described switch voltage-stabilizing chip is exported the direct voltage after the conversion, and connects the feedback end of described switch voltage-stabilizing chip through bleeder circuit.
In order to realize high electric current output, described switch voltage-stabilizing chip adopts a PWM voltage-dropping type DC/DC switching regulator to realize, specifically can adopt AP1506 series power supply chip to dispose simple peripheral circuit and connect realization.
Further, be connected with a rectifier diode at the output of described switch voltage-stabilizing chip, the negative electrode of described rectifier diode connects the output of described switch voltage-stabilizing chip, plus earth.
Further again, after the voltage that the output of described switch voltage-stabilizing chip is exported described switch voltage-stabilizing chip conversion back by the LC filter circuit of being made up of inductance and electric capacity carries out Filtering Processing, connect described power output end on the one hand, the output galvanic current is pressed; Connect described bleeder circuit on the other hand.
Further again, in order to realize, between the input of described switch voltage-stabilizing chip and its switch of power supply output control end, be connected with an electric capacity to the control of the switch of described switch voltage-stabilizing chip output voltage.
Compared with prior art, advantage of the present utility model and good effect are: circuit construction of electric power of the present utility model is simple, cost is low, cooperate simple peripheral circuit can realize the stable output of low-voltage/high current power supply by a slice switch voltage-stabilizing chip, efficiently solve the problem of the required big drive current of large scale integrated circuit in the video equipment system, help the global design of video equipment Circuits System, make things convenient for the interpolation of various external interfaces, on performance and function, had more the market competitiveness.
Description of drawings
Fig. 1 is the power circuit principle figure that the utility model proposes.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Power circuit of the present utility model reduces cost in order to simplify circuit structure, has adopted a switch voltage-stabilizing chip to realize the decompression transformation of DC-to-DC.In order to satisfy the user demand of high electric current output, switch voltage-stabilizing chip of the present utility model selects for use a PWM voltage-dropping type DC/DC switching regulator to form described power circuit simultaneously.Specifically, can adopt the power supply chip of AP1506 series to cooperate simple peripheral circuit to connect realization.The utility model is that example is specifically addressed with the AP1506-ADJ power supply chip, described power supply chip AP1506-ADJ is by the output of field effect transistor switch mosfet control power supply, has inner automatic calibration circuit, input voltage range is 4.75V-23V, and Adjustable Output Voltage, operating frequency are 150KHZ, can stablize the electric current of output up to 3A, efficient can reach 95%, and only needs peripheral components seldom, and particular circuit configurations is referring to shown in Figure 1.
Among Fig. 1,1 pin (IN) of AP1506-ADJ power supply chip U2065 is its voltage input end mouth, connect power input, insert power supply by described power input, power supply with+5V voltage, 1A electric current among the figure is an example, capacitor C 2002, C2603, C2604 play the effect of filtering, and the power supply voltage that can guarantee to be input to power supply chip U2065 is stable.5 pin (SD) of power supply chip U2065 are its switch of power supply output ON/OFF control port, can control whether output voltage of its output.Between 1 pin of described power supply chip U2065 and 5 pin, be connected with a capacitor C 2608, when 1 pin of power supply chip U2065 has the power supply input, control the voltage after its output output conversion.3 pin (GND) ground connection of power supply chip U2065; 2 pin (OUT) are its voltage output end mouth, connect the negative electrode of rectifier diode D2013 on the one hand, the plus earth of rectifier diode D2013; Connect power output end by inductance L 2016 on the other hand, the high current DC voltage after the output conversion process, and by shunt capacitance C2605, C2338, C2352 ground connection.Described inductance L 2016 and capacitor C 2605, C2338, C2352 form the LC filter circuit, and the direct voltage that power supply chip U2065 is exported carries out exporting after the Filtering Processing.It is energy accumulation that described inductance L 2016 also has an effect, and its specification is 15uH.Only having exemplified output voltage among the figure is the situation of 1.8V, 3A, and certainly, the utility model is not limited in above-mentioned giving an example.
4 pin (FB) of described power supply chip U2065 are its feedback input end, and by monitoring this port voltage, power supply chip U2065 can regulate its output voltage automatically, guarantee the stability of output voltage.In order to realize correction to output end voltage, the bleeder circuit that described power output end is formed via resistance R 2245, R2244 connects 4 pin of described power supply chip U2065, realizes effective adjusting of output voltage size by the resistance of adjusting divider resistance R2245, R2244.Between 4 pin of described power output end and power supply chip U2065, also be connected with a capacitor C 2602 simultaneously.The 4 pin reference voltages of described power supply chip U2065 are 1.222V, by formula V
FB=V
OUT* R2244/ (R2244+R2245), calculate the configuration parameter of divider resistance at an easy rate in conjunction with the required supply power voltage of follow-up large scale integrated circuit (being VOUT), realize that power supply chip U2065 provides stable high electric current, low-voltage output to follow-up large scale integrated circuit.
Because the utility model is that example is set forth with output 1.8V direct current supply, therefore, the configuration parameter of described divider resistance R2244, R2245 can be chosen as R2244=1K Ω, R2245=470 Ω, and then the working power of 1.8V, 3A is provided for follow-up large scale integrated circuit.
Certainly, the utility model is not limited in above-mentioned giving an example, and adopts the voltage transitions chip of the high electric current output function of having of other model equally also can realize the utility model proposed invention purpose.
Circuit construction of electric power of the present utility model is simple, cost is low, can be widely used in the video display apparatus such as television set, computer, solved the required big drive current problem of large scale integrated circuit in the video system easily and efficiently, can allow existing video product add more easily and go up various external interfaces, on performance and function, have competitiveness more,, allow the beautiful multimedia joy of life of numerous consumer experiences simultaneously also for the electronic designer provides more wide stage.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (10)
1. low-voltage/high current power supply circuit, comprise power input and power output end, it is characterized in that: in described power circuit, also include a switch voltage-stabilizing chip, the input of described switch voltage-stabilizing chip connects described power input, connects power supply by described power input; The output of described switch voltage-stabilizing chip is exported the direct voltage after the conversion, and connects the feedback end of described switch voltage-stabilizing chip through bleeder circuit.
2. low-voltage according to claim 1/high current power supply circuit is characterized in that: described switch voltage-stabilizing chip is a PWM voltage-dropping type DC/DC switching regulator.
3. low-voltage according to claim 1 and 2/high current power supply circuit, it is characterized in that: the output at described switch voltage-stabilizing chip is connected with a rectifier diode, the negative electrode of described rectifier diode connects the output of described switch voltage-stabilizing chip, plus earth.
4. low-voltage according to claim 3/high current power supply circuit, it is characterized in that: the output of described switch voltage-stabilizing chip on the one hand is connected described power output end after by the LC filter circuit of being made up of inductance and electric capacity, connects described bleeder circuit on the other hand.
5. low-voltage according to claim 4/high current power supply circuit is characterized in that: be connected with an electric capacity between the input of described switch voltage-stabilizing chip and its switch of power supply output control end.
6. video equipment with low-voltage/high current power supply circuit, in the internal circuit of described video equipment, include low-voltage/high current power supply circuit, in described power circuit, include power input and power output end, it is characterized in that: in described power circuit, also include a switch voltage-stabilizing chip, the input of described switch voltage-stabilizing chip connects described power input, connects power supply by described power input; The output of described switch voltage-stabilizing chip is exported the direct voltage after the conversion, and connects the feedback end of described switch voltage-stabilizing chip through bleeder circuit.
7. video equipment according to claim 6 is characterized in that: described switch voltage-stabilizing chip is a PWM voltage-dropping type DC/DC switching regulator.
8. according to claim 6 or 7 described video equipments, it is characterized in that: the output at described switch voltage-stabilizing chip is connected with a rectifier diode, and the negative electrode of described rectifier diode connects the output of described switch voltage-stabilizing chip, plus earth.
9. video equipment according to claim 8 is characterized in that: the output of described switch voltage-stabilizing chip on the one hand is connected described power output end after by the LC filter circuit of being made up of inductance and electric capacity, connects described bleeder circuit on the other hand.
10. video equipment according to claim 9 is characterized in that: be connected with an electric capacity between the input of described switch voltage-stabilizing chip and its switch of power supply output control end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200222233U CN201039336Y (en) | 2007-05-15 | 2007-05-15 | Low-voltage/high current power supply circuit and video device with this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200222233U CN201039336Y (en) | 2007-05-15 | 2007-05-15 | Low-voltage/high current power supply circuit and video device with this circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201039336Y true CN201039336Y (en) | 2008-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200222233U Expired - Fee Related CN201039336Y (en) | 2007-05-15 | 2007-05-15 | Low-voltage/high current power supply circuit and video device with this circuit |
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| CN (1) | CN201039336Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122924A (en) * | 2014-07-18 | 2014-10-29 | 苏州华兴源创电子科技有限公司 | Switch-type voltage stabilizing circuit and constant voltage constant current generation circuit with switch-type voltage stabilizing circuit |
-
2007
- 2007-05-15 CN CNU2007200222233U patent/CN201039336Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122924A (en) * | 2014-07-18 | 2014-10-29 | 苏州华兴源创电子科技有限公司 | Switch-type voltage stabilizing circuit and constant voltage constant current generation circuit with switch-type voltage stabilizing circuit |
| CN104122924B (en) * | 2014-07-18 | 2016-08-24 | 苏州华兴源创电子科技有限公司 | A kind of switching mode mu balanced circuit and the constant pressure and flow comprising this circuit produce circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20110515 |