CN203133743U - Embedded type system energy-saving device based on external MOSFET tube - Google Patents
Embedded type system energy-saving device based on external MOSFET tube Download PDFInfo
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- CN203133743U CN203133743U CN 201220744936 CN201220744936U CN203133743U CN 203133743 U CN203133743 U CN 203133743U CN 201220744936 CN201220744936 CN 201220744936 CN 201220744936 U CN201220744936 U CN 201220744936U CN 203133743 U CN203133743 U CN 203133743U
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- processor
- system energy
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- mosfet pipe
- resistance
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Abstract
An embedded type system energy-saving device based on an external MOSFET tube comprises a processor, a voltage reduction converter connected with the processor, and external first and second resistors R1 and R2, wherein the first resistor R1 and the second resistor R2 are used for regulating output voltages of the voltage reduction converter, the processor is connected with the grid of an MOSFET tube grid to control the MOSFET tube to be on and off, and a third resistor R3 connected with R2 in parallel is arranged in an external N channel MOSFET. According to the technical scheme, the external MOSFET tube is used, under the condition that normal working of the processor is not influenced, power supply voltages of the processor in a sleep mode or in a wait-for-response mode are changed, and power utilization efficiency can be improved to some extent.
Description
Technical field
The utility model relates to a kind of embedded system energy saver of regulating supply voltage based on outside MOSFET pipe.Specifically refer to a kind of electric power controller of finishing the energy-conservation embedded system of step-down by outside MOSFET pipe adjusting DC/DC power supply feedback resistance.
Background technology
For a long time, portable consumer electronic device faces the challenge of high-performance and low-power consumption.These battery power supply systems use flush bonding processor usually, in order to maximum processing power is provided when handling multimedia application, reach minimum power consumption when sleep pattern.
Square being directly proportional of the power consumption of processor and operating voltage, and with frequency of operation also linear proportional relation.Therefore, reduce frequency and will reduce dynamic power consumption linearly, can make dynamic power consumption be exponential form decline and reduce core voltage.
In traditional powered battery was used, the dynamic electric voltage in the processor was regulated and is normally utilized the builtin voltage controller to realize.Core voltage after internal register allows to adjust is subjected to software control, in order to cut down the consumption of energy, and the longest battery life of final realization.Processor is in park mode or wait-for-response process, and externally fed voltage does not reduce, and causes electric power system efficient lower, and this method is not optimum concerning high-performance hand-held battery power applications.
Summary of the invention
The utility model is a kind of embedded system energy-saving scheme based on outside MOSFET pipe.This scheme is used outside MOSFET pipe, under the situation that does not influence the processor operate as normal, changes the supply voltage of processor when dormancy or wait-for-response, and this scheme can improve power utilization efficient to a certain extent.
The technical solution of the utility model is:
A kind of embedded system energy saver based on outside MOSFET pipe, comprise processor, the step-down controller that is connected with processor, and outside first resistance R 1 and second resistance R 2 that are used for the output voltage of adjusting step-down controller, its special character is: described processor connects the MOSFET tube grid, the switch of control MOSFET pipe, the externally setting of N channel mosfet and R2 and the 3rd resistance R 3 that connects.
Above-mentioned processor connects an extra resistance, and control voltage Vc injects electric current to feedback network, and the dutycycle of adjusting control voltage can change average DC level.
Above-mentioned processor is connected with the feed-forward capacitance C that obtains better mapping and load regulation
f
The above-mentioned DC/DC power supply chip of regulating based on outside MOSFET pipe comprises LM2574M, LM2883XMY and LTC3839.
Implementation method of the present utility model, this method comprises:
1) at first, suppose that the required kernel normal voltage of processor is 1.2V, minimum voltage is 1V.System power supply on processor plate is powered to step-down controller, by non-essential resistance voltage divider R1 and R2 the output voltage of step-down controller is arranged on 1.2V.
2) with the insertion of outside N channel mosfet and R2 and the resistance R 3 that connects.
3) with processor GPIO voltage driven MOS FET tube grid, by the switch of control MOSFET pipe, core voltage can be adjusted to 1.0V from 1.2V thereby change feedback resistance.
4) also available control voltage Vc and inject electric current to feedback network by an extra resistance.The dutycycle of adjusting control voltage can change average DC level.Like this, single control voltage and resistance just can be used for adjusting output voltage.
5) increase feed-forward capacitance C
fCan be used for obtaining better mapping and load regulation.
2, the DC/DC power supply chip of regulating based on outside MOSFET pipe comprises: LM2574M, LM2883XMY, LTC3839 etc.
Advantage of the present utility model is:
1, hardware circuit simple and stable, peripheral circuit is few, saves the PCB area.
Owing to use outside MOSFET pipe and DC/DC builtin voltage controller to regulate as system's dynamic electric voltage, replace conventional processors builtin voltage controller control method, make the hardware circuit simple and stable, peripheral circuit is few, can effectively reduce the PCB area, and debugging is convenient.
2, effectively reduce system power dissipation, prolong battery serviceable life.
By changing the feedback resistance resistance, thereby change system's supply voltage, reduce system power dissipation, effectively prolonged battery serviceable life.
3, can realize any output voltage combination and output load current.
Utilize control voltage to the feedback network input signal, peripheral circuit is reduced, can also realize any output voltage combination and output load current, and can drive the various loads except capacitive load.
Description of drawings
Fig. 1 realizes hardware elementary diagram for the utility model.
Embodiment
Referring to Fig. 1,
1) at first, be example with STM32F103V8, this processor normal working voltage scope is 2.0V to 3.6V.
2) system power supply on processor plate is given the power supply of DC/DC power supply, by non-essential resistance voltage divider R1 and R2 the output voltage of step-down controller is arranged on 3.6V.
3) calculate the feedback resistance R2 of DC/DC power supply and the value of R3, and control voltage amplitude V
C_LOWAnd V
C_HIGHComputing formula is:
Work as V
OUT1=3.6 V, V
OUT2=2.0 V, V
FB=0.8 V, V
C_LOW=3.3 V, V
C_HIGHWhen=0 V and R1=50.1 k Ω, the value that can obtain R2 and R3 is:
4) with the insertion of outside N channel mosfet and R2 and the resistance R 3 that connects.
5) with processor GPIO voltage driven MOS FET tube grid, by the switch of control MOSFET pipe, when processor sleep state, change feedback resistance, voltage is adjusted to 2.0V from 3.6V.
6) processor is under 25 ℃ of conditions in 36MHz frequency, environment temperature, and normally moving institute's consumed current power consumption is 20mA, and park mode institute consumed current power consumption is 15mA.Adopt above-mentioned step-down energy-saving scheme, under the processor park mode, can effectively reduce more than 30% required power consumption.
Characteristics of the present utility model are:
The hardware circuit of simple and stable utilizes the MOSFET pipe to change feedback resistance, improves power work efficient.
Next controls the voltage feedback system, can realize any output voltage combination and output load current, and can drive any type load.
Claims (4)
1. embedded system energy saver based on outside MOSFET pipe, comprise processor, the step-down controller that is connected with processor, and outside first resistance R 1 and second resistance R 2 that are used for the output voltage of adjusting step-down controller, it is characterized in that: described processor connects the MOSFET tube grid, the switch of control MOSFET pipe, the externally setting of N channel mosfet and R2 and the 3rd resistance R 3 that connects.
2. according to the described embedded system energy saver based on outside MOSFET pipe of claim 1, it is characterized in that: described processor connects an extra resistance, control voltage Vc injects electric current to feedback network, and the dutycycle of adjusting control voltage can change average DC level.
3. according to the described embedded system energy saver based on outside MOSFET pipe of claim 1, it is characterized in that: described processor is connected with the feed-forward capacitance C that obtains better mapping and load regulation
f
4. according to the arbitrary described embedded system energy saver based on outside MOSFET pipe of claim 1～3, it is characterized in that: the described DC/DC power supply chip of regulating based on outside MOSFET pipe comprises LM2574M, LM2883XMY and LTC3839.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220744936 CN203133743U (en) | 2012-12-31 | 2012-12-31 | Embedded type system energy-saving device based on external MOSFET tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220744936 CN203133743U (en) | 2012-12-31 | 2012-12-31 | Embedded type system energy-saving device based on external MOSFET tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203133743U true CN203133743U (en) | 2013-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220744936 Expired - Lifetime CN203133743U (en) | 2012-12-31 | 2012-12-31 | Embedded type system energy-saving device based on external MOSFET tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203133743U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI585567B (en) * | 2014-11-24 | 2017-06-01 | 鴻海精密工業股份有限公司 | Voltage adjust apparatus for electronic device |
-
2012
- 2012-12-31 CN CN 201220744936 patent/CN203133743U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI585567B (en) * | 2014-11-24 | 2017-06-01 | 鴻海精密工業股份有限公司 | Voltage adjust apparatus for electronic device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 710077 Xi'an high tech Zone, Jin Industrial Road, No., No. C Venture Park, No. 8, Patentee after: XI'AN KEYWAY TECHNOLOGY Co.,Ltd. Address before: 710077 Xi'an high tech Zone, Jin Industrial Road, No., No. C Venture Park, No. 8, Patentee before: Xi'an Keyway Technology Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |