CN201039333Y - Voltage conversion circuit and TV set with this circuit - Google Patents
Voltage conversion circuit and TV set with this circuit Download PDFInfo
- Publication number
- CN201039333Y CN201039333Y CNU2007200183614U CN200720018361U CN201039333Y CN 201039333 Y CN201039333 Y CN 201039333Y CN U2007200183614 U CNU2007200183614 U CN U2007200183614U CN 200720018361 U CN200720018361 U CN 200720018361U CN 201039333 Y CN201039333 Y CN 201039333Y
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Abstract
The utility model discloses a voltage converting circuit and a television with the voltage converting circuit, comprising a voltage converter. An inputting end of the voltage converter is connected with an inputting power needing to be converted; the converted direct current voltage is output through an outputting end of the voltage converter after the conversion, wherein, the voltage converter comprises a switch controlling end and a gating end which is connected with a switch circuit; a controlling end of the switch circuit receives the power supply switch signal and controls the break-over or stopping stage according to the high and low PWL states of the power switch signal so as to change the electric potential of the switch controlling end of the voltage converter; the voltage converter decides that whether the outputting end outputs the converted voltage or not according to the electric potential state of the switch controlling end. The voltage converting circuit of the utility model having the advantages of simple structure, stable and reliable use not only realizes the voltage reduction conversion of the direct current voltage so as to satisfy the power supplying demands of different circuit modules and integrating apparatuses in a circuit board, but also effectively saves the system energy resource and improves the quality of the apparatus.
Description
Technical field
The utility model relates to a kind of voltage conversion circuit, specifically, relates to the controlled step-down conversion circuit of a kind of output voltage.
Background technology
For present tv product, its Circuits System becomes increasingly complex, and often comprises a lot of circuit modules and integrated device.These circuit modules or integrated device the time need be used the supply power voltage of 1.8V in work, and the supply power voltage of general circuit plate is 5V, the step-down conversion circuit that this just need be from 5V to 1.8V, and these step-down conversion circuit needs can provide bigger output current.Present voltage conversion circuit is just in running order always after electric equipment works on power, even do not work, when not needing decompression transformation at circuit module and integrated device, still the bigger electric current of output will bring loss to circuit like this, causes the waste of the energy.
Summary of the invention
The utility model is in order to satisfy the power demands of circuit module or integrated device, and reach energy-saving and cost-reducing goal of the invention, a kind of novel voltage conversion circuit is provided, not only realized the decompression transformation of direct voltage, and its output current realized control, effectively reduce circuit loss, saved the energy.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of voltage conversion circuit and have the television set of described change-over circuit, comprise electric pressure converter, its input connects input power supply to be converted, direct voltage after passing through its output output conversion after the conversion, wherein, described electric pressure converter includes the switch control end, the gating end that connects a switching circuit, the control end of described switching circuit receives power switch signal, according to its conducting of high-low level State Control or the cut-off state of described power switch signal, and then change the current potential of the switch control end of described electric pressure converter; Described electric pressure converter determines voltage after whether its output exports conversion according to the potential state of its switch control end.
Specifically, the control end of described switching circuit connects the I/O mouth of master chip, receives the power switch signal of master chip output, gating end one end ground connection, and the other end connects the switch control end of described electric pressure converter.
In order to simplify circuit structure, in described switching circuit, include a NPN type triode, the base stage of described triode connects the I/O mouth of master chip, grounded emitter, collector electrode connects the switch control end of described electric pressure converter.
In the utility model, described electric pressure converter is the DC decompression converter of an Adjustable Output Voltage, includes a feedback end, on the one hand by a divider resistance ground connection, connects the output of described electric pressure converter on the other hand by another divider resistance.The output of described electric pressure converter connects the negative electrode of fly-wheel diode, the plus earth of described fly-wheel diode on the other hand on the one hand by the voltage after the energy storage inductor output conversion.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is by being provided with electric pressure converter on circuit board, thereby realized the decompression transformation of direct voltage, satisfied the power demands of different circuit modules and integrated device in the circuit board.In order to reach energy-saving and cost-reducing goal of the invention, the utility model has connected a switching circuit at the switch control end of described electric pressure converter again, when circuit module in the circuit board and integrated device is not worked, when not needing decompression transformation, change the conducting and the cut-off state of described switching circuit, block the output end voltage of described electric pressure converter, thereby realized switch control, effectively reduced circuit loss, saved the energy its output current.
Description of drawings
Fig. 1 is the schematic diagram of voltage conversion circuit in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
The utility model is in order to realize the decompression transformation of direct voltage, and output current controlled, a kind of voltage conversion circuit is proposed, comprise electric pressure converter, its input connects input power supply to be converted, direct voltage after passing through its output output conversion after the conversion, wherein, described electric pressure converter includes the switch control end, the gating end that connects a switching circuit, the control end of described switching circuit receives power switch signal, according to its conducting of high-low level State Control or the cut-off state of described power switch signal, and then changes the current potential of the switch control end of described electric pressure converter; Described electric pressure converter determines voltage after whether its output exports conversion according to the potential state of its switch control end.
Embodiment one, and as shown in Figure 1, in the utility model, described electric pressure converter adopts the DC decompression converter AP1501 of an Adjustable Output Voltage to realize, its input IN connects to be converted+5V and imports power supply, and through filter capacitor C2 ground connection; After its output OUT output conversion+the 1.8V direct voltage; Feedback end FB connects the output OUT of electric pressure converter AP1501 on the other hand on the one hand by a divider resistance R2244 ground connection by another divider resistance R2245.Divider resistance R2244 and R2245 constitute feedback network together, can determine different output voltages by the ratio of setting resistance R 2244 and resistance R 2245.In order to realize the stable of electric pressure converter AP1501 output voltage, the output OUT of described electric pressure converter AP1501 connects the negative electrode of sustained diode 13 on the one hand, the plus earth of sustained diode 13, connect the 1.8V voltage output end by energy storage inductor L16 on the other hand, and through filter capacitor C605, C606 ground connection, the direct voltage after the output buck conversion.
In order to realize switch control to described electric pressure converter AP1501 output current, on the control end SD of electric pressure converter AP1501, connected a switching circuit, the control end of described switching circuit receives power switch signal, gating end one end ground connection, the other end connects the control end SD of electric pressure converter AP1501.By changing the conducting and the cut-off state of switching circuit, realize the switch control of described electric pressure converter AP1501 output circuit.
In order to simplify circuit structure, switching circuit of the present utility model adopts a NPN type triode Q907 to realize, the collector electrode of triode Q907 connects the switch control end SD of electric pressure converter AP1 501 by resistance R 924, base stage connects the I/O mouth of master chip, receive the power switch signal of master chip MCU output, grounded emitter.Q907 conducting of high-low level State Control triode or cut-off state according to power switch signal, and then changing the current potential of the switch control end SD of electric pressure converter AP1501, electric pressure converter AP1501 determines voltage after whether its output OUT exports conversion according to the potential state of its switch control end SD.
The utility model adopts integrated chip AP1501 to realize the decompression transformation of 5V to 1.8V, the electric current of maximum exportable 3A.When certain circuit module or integrated device need operate as normal, master chip sends the high level power switch signal, triode Q907 conducting, the current potential of the switch control end SD of electric pressure converter AP1501 is dragged down, 1.8V direct voltage after the electric pressure converter AP1501 output conversion, the circuit module operate as normal.When not needing this circuit module or integrated device when work, master chip sends the low level power switching signal, and then electric pressure converter AP1501 output current is not blocked its output OUT voltage, thereby saved system energy consumption.
Voltage conversion circuit of the present utility model is simple in structure, realizes easily, can be widely used in the electronic product such as television set.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. a voltage conversion circuit comprises electric pressure converter, and its input connects input power supply to be converted, the direct voltage after passing through its output output conversion after the conversion; It is characterized in that: described electric pressure converter includes the switch control end, the gating end that connects a switching circuit, the control end of described switching circuit receives power switch signal, according to its conducting of high-low level State Control or the cut-off state of described power switch signal, and then change the current potential of the switch control end of described electric pressure converter; Described electric pressure converter determines voltage after whether its output exports conversion according to the potential state of its switch control end.
2. voltage conversion circuit according to claim 1, it is characterized in that: the control end of described switching circuit connects the I/O mouth of master chip, receive the power switch signal of master chip output, gating end one end ground connection, the other end connects the switch control end of described electric pressure converter.
3. voltage conversion circuit according to claim 2, it is characterized in that: in described switching circuit, include a NPN type triode, the base stage of described triode connects the I/O mouth of master chip, grounded emitter, and collector electrode connects the switch control end of described electric pressure converter.
4. voltage conversion circuit according to claim 1 and 2, it is characterized in that: described electric pressure converter is the DC decompression converter of an Adjustable Output Voltage, include a feedback end, by a divider resistance ground connection, connect the output of described electric pressure converter on the other hand by another divider resistance on the one hand.
5. voltage conversion circuit according to claim 4 is characterized in that: the output of described electric pressure converter connects the negative electrode of fly-wheel diode, the plus earth of described fly-wheel diode on the other hand on the one hand by the voltage after the energy storage inductor output conversion.
6. the television set with the described voltage conversion circuit of claim 1 comprises electric pressure converter, and its input connects input power supply to be converted, the direct voltage after passing through its output output conversion after the conversion; It is characterized in that: described electric pressure converter includes the switch control end, the gating end that connects a switching circuit, the control end of described switching circuit receives power switch signal, according to its conducting of high-low level State Control or the cut-off state of described power switch signal, and then change the current potential of the switch control end of described electric pressure converter; Described electric pressure converter determines voltage after whether its output exports conversion according to the potential state of its switch control end.
7. television set according to claim 6, it is characterized in that: the control end of described switching circuit connects the I/O mouth of master chip, receive the power switch signal of master chip output, gating end one end ground connection, the other end connects the switch control end of described electric pressure converter.
8. television set according to claim 7 is characterized in that: include a NPN type triode in described switching circuit, the base stage of described triode connects the I/O mouth of master chip, grounded emitter, and collector electrode connects the switch control end of described electric pressure converter.
9. according to claim 6 or 7 described television sets, it is characterized in that: described electric pressure converter is the DC decompression converter of an Adjustable Output Voltage, include a feedback end, by a divider resistance ground connection, connect the output of described electric pressure converter on the other hand by another divider resistance on the one hand.
10. television set according to claim 9 is characterized in that: the output of described electric pressure converter connects the negative electrode of fly-wheel diode, the plus earth of described fly-wheel diode on the other hand on the one hand by the voltage after the energy storage inductor output conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200183614U CN201039333Y (en) | 2007-01-31 | 2007-01-31 | Voltage conversion circuit and TV set with this circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200183614U CN201039333Y (en) | 2007-01-31 | 2007-01-31 | Voltage conversion circuit and TV set with this circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201039333Y true CN201039333Y (en) | 2008-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200183614U Expired - Fee Related CN201039333Y (en) | 2007-01-31 | 2007-01-31 | Voltage conversion circuit and TV set with this circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201039333Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102457172A (en) * | 2011-12-13 | 2012-05-16 | 上海微频莱机电科技有限公司 | Switching power supply |
| CN102723858A (en) * | 2012-07-04 | 2012-10-10 | 铭薪电子（深圳）有限公司 | Car-mounted wide power supply voltage stabilization plate and navigation television |
| CN105896475A (en) * | 2016-06-06 | 2016-08-24 | 青岛歌尔声学科技有限公司 | Protection circuit of multi-stage DC conversion circuit |
| CN107295279A (en) * | 2017-07-27 | 2017-10-24 | 广东长虹电子有限公司 | A kind of television set of low power standby |
| CN111130347A (en) * | 2019-12-30 | 2020-05-08 | 深圳市昊岳电子有限公司 | Closed loop system based on TPMS real-time control power module output voltage |
-
2007
- 2007-01-31 CN CNU2007200183614U patent/CN201039333Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102457172A (en) * | 2011-12-13 | 2012-05-16 | 上海微频莱机电科技有限公司 | Switching power supply |
| CN102723858A (en) * | 2012-07-04 | 2012-10-10 | 铭薪电子（深圳）有限公司 | Car-mounted wide power supply voltage stabilization plate and navigation television |
| CN102723858B (en) * | 2012-07-04 | 2015-04-08 | 铭薪电子（深圳）有限公司 | Car-mounted wide power supply voltage stabilization plate and navigation television |
| CN105896475A (en) * | 2016-06-06 | 2016-08-24 | 青岛歌尔声学科技有限公司 | Protection circuit of multi-stage DC conversion circuit |
| CN107295279A (en) * | 2017-07-27 | 2017-10-24 | 广东长虹电子有限公司 | A kind of television set of low power standby |
| CN111130347A (en) * | 2019-12-30 | 2020-05-08 | 深圳市昊岳电子有限公司 | Closed loop system based on TPMS real-time control power module output voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110131 |