CN101847894B - Power supply circuit for chip of automobile audio - Google Patents
Power supply circuit for chip of automobile audio Download PDFInfo
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- CN101847894B CN101847894B CN 201010138989 CN201010138989A CN101847894B CN 101847894 B CN101847894 B CN 101847894B CN 201010138989 CN201010138989 CN 201010138989 CN 201010138989 A CN201010138989 A CN 201010138989A CN 101847894 B CN101847894 B CN 101847894B
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- power supply
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- chip microcomputer
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Abstract
The invention relates to the technical field of automobile audios, in particular to a power supply circuit for a chip of the automobile audio. The power supply circuit for the chip of the automobile audio comprises a power supply chip integrated circuit (IC) and a first power storage element which is connected with an output pin of the power supply IC, wherein a connecting point between the output pin of the power supply chip and the first power storage element is connected with a power supply pin of a micro-programmed control unit (MCU). The power supply circuit for the chip of the automobile audio can further simplify relationship between power supply and a power supply impulse test, further reduce influences of external undetermined factors on the power supply impulse test, reduce times of the power supply impulse test and save time and cost. The scheme can further perfect the design of software and hardware.
Description
Technical field
The present invention relates to the automobile audio correlative technology field, particularly a kind of power-supplying circuit that is used for chip of automobile audio.
Background technology
In the power supply power supply plan of existing circuit, the power supply power supply also will give many other parts (like EEPROM except to the main control MCU power supply simultaneously; Remote control, blink LED, button; Power knob, cd_insert line etc.) power supply, these parts are when power down; The capital consumes the electric weight of capacitance stores, thereby causes the supply power voltage of main control MCU in than the short period, just to drop to the voltage that MCU produces the requirement that resets.
This scheme mainly contains following 2 weak points:
1, increased power supply and power pulse the experiment between uncertain factor.
2, be not easy to the developer and design corresponding improvement scheme.
Summary of the invention
The present invention provides a kind of power-supplying circuit that is used for chip of automobile audio, is not easy to satisfy the technical problem of power pulse experiment with the power supply circuits that solve the prior art design.
The technical scheme that the present invention adopts is following:
A kind of power-supplying circuit that is used for chip of automobile audio; Comprise power supply chip (IC); And the first accumulate element that links to each other with the output pin of power supply chip, the output pin of power supply chip is connected with the supply pin of single-chip microcomputer (MCU) with the tie point of the first accumulate element.
As a kind of preferred version, also be connected with directed conducting element between the output pin of said power supply chip and the supply pin of single-chip microcomputer.
As further preferred version, the supply pin of said single-chip microcomputer and the tie point of directed conducting element also are connected to the second accumulate element, and the supply pin of single-chip microcomputer is through the second accumulate element ground connection.
As a kind of preferred version, the described first accumulate element and the second accumulate element are electric capacity.
As a kind of preferred version, described directed conducting element is a diode, and the positive pole of diode is connected with the output pin of power supply chip, and negative pole is connected with the supply pin of single-chip microcomputer.
The present invention can further simplify the relation between power supply and the power pulse test, further reduces the influence of extraneous uncertain factor to the power pulse experiment, shortens the test number (TN) of power pulse, saves development time and cost.Can further improve the design of software and hardware through this scheme.
Description of drawings
Fig. 1 is power supply IC power supply figure of the present invention;
Fig. 2 is MCU energization pins figure of the present invention;
Fig. 3 is the power down curve model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is carried out further detailed explanation.
The present invention the power supply of main control MCU and other device separately; Supply power separately to main control MCU through after being connected in series a diode and being connected a big electric capacity; And the power consumption of other parts changes not influence of main control MCU, and the speed of main control MCU power down is only by determining with its direct-connected electric capacity.
The power-supplying circuit of present embodiment is as depicted in figs. 1 and 2; Comprise power supply IC; And the electric capacity 2906 that links to each other with the output pin of power supply IC; The output pin of power supply chip is connected with the supply pin of MCU through diode with the tie point TP28 of electric capacity 2906, and the tie point H54 of diode and MCU is through electric capacity 2701 ground connection.
Like Fig. 3 is the power down curve model, abscissa express time wherein, and ordinate is represented voltage.0～T1 representes the high frequency power down stage, and T1～T2 representes the low frequency power down stage, and T2 representes to reset the power down stage later on.Voltage when V1 is the sound equipment shutdown, VR are the minimum voltages of single-chip microcomputer ability operate as normal when low frequency.V0 is a constant, the voltage when being system's operate as normal.
We can draw following formula:
ΔV＝V0-V1＝V0-VR-(V1-VR)＝V0-VR-K(T2-T1)，
Wherein K is the power down rate, and V0=5v confirms for a certain specific single-chip microcomputer VR, is example with ToshibaTMP87PP21F series, VR=2.7v, and then above formula can be simplified as follows:
ΔV＝2.3-K(T2-T1)，
We just can release following two conclusions from this formula:
1. for a specific hardware, K and T2 are a constant, if T1 is more little, then Δ V is more little,
The power down curve is slow more, more easily through the power pulse experiment.
2. for a software specifically, T1 and Δ V are a constant, above formula can further develop and be:
K＝(2.3-ΔV)/(T2-T1)，
Then K and T2 are inversely proportional to, and K is more little, and T2 is just big more.
Therefore, in circuit design, need to increase electric capacity, electric capacity is big more, and the electric weight that then stores is many more, and the voltage drop K of unit interval is just more little, thereby T1～T2 is just big more.In the present embodiment; Then be through increasing electric capacity 2701; Thereby delay T1～T2, can T1～T2 weigh the key that pass through the power pulse test, as long as voltage recovers the normal time interval from dropping in T1～T2＞power pulse test; Just can be through power pulse test, in other words be exactly to be greater than the time interval that the power pulse test voltage is in undesired variation the electric weight that stores of electric capacity 2701 time that can keep the single-chip microcomputer operate as normal to get final product.Electric capacity 2906 is reduced to 220uF from 1000uF in addition.
Claims (1)
1. a power-supplying circuit that is used for chip of automobile audio comprises power supply chip, and the first accumulate element that links to each other with the output pin of power supply chip, it is characterized in that,
The output pin of said power supply chip is connected with the supply pin of single-chip microcomputer with the tie point of the first accumulate element;
Also be connected with directed conducting element between the output pin of said power supply chip and the supply pin of single-chip microcomputer;
The supply pin of said single-chip microcomputer and the tie point of directed conducting element also are connected to the second accumulate element, and the supply pin of single-chip microcomputer is through the second accumulate element ground connection; The described first accumulate element and the second accumulate element are electric capacity; Described directed conducting element is a diode, and the positive pole of diode is connected with the output pin of power supply chip, and negative pole is connected with the supply pin of single-chip microcomputer;
In the said power-supplying circuit, have: power down rate K=(2.3-Δ V)/(T2-T1), as long as T1～T2 recovers the normal time interval from dropping to greater than voltage in the power pulse test, just can be through the power pulse test; Voltage when Δ V=V0-V1=V0-VR-(V1-VR)=V0-VR-K (T2-T1) wherein, V1 are the sound equipment shutdown, VR are the minimum voltages that single-chip microcomputer can operate as normal when low frequency, and V0 is a constant, the voltage when being system's operate as normal; 0～T1 representes the high frequency power down stage, and T1～T2 representes the low frequency power down stage, and T2 representes to reset the power down stage later on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010138989 CN101847894B (en) | 2010-03-31 | 2010-03-31 | Power supply circuit for chip of automobile audio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010138989 CN101847894B (en) | 2010-03-31 | 2010-03-31 | Power supply circuit for chip of automobile audio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101847894A CN101847894A (en) | 2010-09-29 |
| CN101847894B true CN101847894B (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010138989 Expired - Fee Related CN101847894B (en) | 2010-03-31 | 2010-03-31 | Power supply circuit for chip of automobile audio |
Country Status (1)
| Country | Link |
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| CN (1) | CN101847894B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2556837Y (en) * | 2002-03-01 | 2003-06-18 | 顺德市华傲电子有限公司 | Power-off holding circuit for small domestic electrical equipment controller |
| CN2859901Y (en) * | 2005-11-29 | 2007-01-17 | 海尔集团公司 | Household electrical appliance control device |
| CN100451906C (en) * | 2005-12-30 | 2009-01-14 | 深圳创维－Rgb电子有限公司 | CPU electric supply circuit of automobile sound equipment |
-
2010
- 2010-03-31 CN CN 201010138989 patent/CN101847894B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2556837Y (en) * | 2002-03-01 | 2003-06-18 | 顺德市华傲电子有限公司 | Power-off holding circuit for small domestic electrical equipment controller |
| CN2859901Y (en) * | 2005-11-29 | 2007-01-17 | 海尔集团公司 | Household electrical appliance control device |
| CN100451906C (en) * | 2005-12-30 | 2009-01-14 | 深圳创维－Rgb电子有限公司 | CPU electric supply circuit of automobile sound equipment |
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| Publication number | Publication date |
|---|---|
| CN101847894A (en) | 2010-09-29 |
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Address after: 516006 Guangdong province Huizhou Zhongkai hi tech Industrial Development Zone Pearl River Road No. 1 Patentee after: HUIZHOU DESAY SV AUTOMOTIVE CO., LTD. Address before: 516006 Guangdong province Huizhou Zhongkai hi tech Industrial Development Zone Pearl River Road No. 1 Patentee before: Huizhou Desay SV Auto. Electronics Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20200331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |