CN2909335Y - Circuit for detecting real-time load current of central processor - Google Patents
Circuit for detecting real-time load current of central processor Download PDFInfo
- Publication number
- CN2909335Y CN2909335Y CN 200620117634 CN200620117634U CN2909335Y CN 2909335 Y CN2909335 Y CN 2909335Y CN 200620117634 CN200620117634 CN 200620117634 CN 200620117634 U CN200620117634 U CN 200620117634U CN 2909335 Y CN2909335 Y CN 2909335Y
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- circuit
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Abstract
The utility model relates to a CPU real-time load current detection circuit, including a power supply circuit to provide power to CPU. The technical key of the utility model is to include a delay circuit provided with a resistance and a capacitor connected with the power supply circuit; a current sensing circuit provided with a comparison circuit connected with the delay circuit and the power supply circuit; a current feedback circuit provided with a feedback current supply and a resistance connected with the current sensing circuit and reflecting the sensing current. Through the above-mentioned structure, the current can be monitored accurately with little errors.
Description
Technical field
The utility model is relevant with the detection technique of load current, is meant the real-time load current detection circuit of a kind of central processing unit especially.
Background technology
In No. 200534069 " current loading pick-up unit and group are established the power system of current loading pick-up unit " patent of invention of bulletin, expose a kind of technology that detects load current.Having disclosed known load detecting circuit 60 in its technical background, as shown in Figure 2, mainly is to utilize power supply unit 61 that the direct current of the accurate position of low-voltage is provided technically, required electric power during with supply central processing unit 69 or the running of other load device.And cooperate PWM controller 62 to control high gate control signal and low gate control signal by energy storage inductor L6 and storage capacitor C6, to control the opened/closed state of two derailing switches 64 respectively, make power supply unit 61 can provide electrical power to central processing unit 69.And relending the surface temperature that monitors central processing unit 69 by a resistance 66 and an inductor 67, it mainly is to detect pressure drop on the resistance 66 by this inductor 67, with the magnitude of current or the change in pressure drop that obtains central processing unit 69 indirectly.
Aforementioned techniques is to measure electric current by resistance 66 to change, and its error is bigger, and the countermeasure of being taked (for example speed of cooling fan of central processing unit control) can't meet demand accurately.
And No. 200534069 " current loading pick-up unit and group are established the power system of current loading pick-up unit " patent of invention of aforesaid bulletin, its technology mainly is in order to improve aforementioned disappearance, and add a current loading testing circuit 70 in aforesaid known circuits 60, as shown in Figure 3.Can detect high gate control signal and low gate control signal whereby, or high/low accurate variation of holding time of pwm signal, (for example the control of the speed of cooling fan of central processing unit is faster and can take countermeasure in the very first time, make the radiating efficiency better), and solved aforementioned disappearance.
Though aforementioned techniques can be monitored electric current, yet detected electric current is the variation of comprehensively being judged electric current by high gate control signal, low gate control signal and pwm signal.It still has error to exist.
The utility model content
Fundamental purpose of the present utility model is to provide a kind of central processing unit real-time load current detection circuit, and it is that electric current is monitored, and does not more have error.
In order to reach aforementioned purpose,, include according to the real-time load current detection circuit of a kind of central processing unit provided by the utility model: a power supply circuit, in order to provide power supply to this central processing unit.And technology of the present utility model focuses on more having comprised: a delay circuit, mainly have resistance and an electric capacity, and be connected in this power supply circuit; One current sensing circuit mainly has a comparator circuit, and this comparator circuit is connected in this delay circuit and this power supply circuit; One electric current feedback loop mainly has a feedback current source and a resistance, is connected in this current sensing circuit, and this feedback current source is to go out this current sensor in order to mirror.
The real-time load current detection circuit of described central processing unit, wherein: the resistance of this delay circuit is to be connected in series mutually with electric capacity.
The real-time load current detection circuit of described central processing unit, wherein: the feedback current source of this electric current feedback loop is to be connected in series with this resistance.
The real-time load current detection circuit of described central processing unit, wherein: this comparator circuit comprises a computing (OP) amplifier.
The utility model can be monitored the central processing unit load current accurately in real time by above-mentioned framework, does not more have error.
Description of drawings
Fig. 1 is the circuit structure diagram of the utility model one preferred embodiment;
Fig. 2 is the synoptic diagram of known Weight detector;
Fig. 3 is the synoptic diagram of known current loading pick-up unit.
Embodiment
In order to describe structure of the present utility model and characteristics place in detail, lift now the explanation of a following preferred embodiment and conjunction with figs. as after, wherein:
Fig. 1 is the circuit structure diagram of the utility model one preferred embodiment.
As shown in Figure 1, the real-time load current detection circuit 10 of a kind of central processing unit that the utility model first preferred embodiment is provided, mainly formed by a power supply circuit 11, a delay circuit 21, a current sensing circuit 31 and an electric current feedback loop 41, wherein:
This power supply circuit 11 is in order to provide power supply to this central processing unit (not shown).This power supply circuit 11 mainly comprises the series equivalent resistance (DCR) and a capacitor C 1 of a power supply driver 12, two switches 14, one inductance L, and the framework of its binding generally is same as the example of second in the aforementioned known technology and discloses, and holds and does not give unnecessary details.
Characteristics of the present utility model are:
This delay circuit 21 mainly has a resistance R
ISENAn and capacitor C
TAnd be connected in series mutually, be connected in this power supply circuit 11.
This current sensing circuit 31 mainly has a comparator circuit 32, mainly is made up of a computing (OP) amplifier 34, and this comparator circuit 32 is connected in this delay circuit 21 and this power supply circuit 11.
This electric current feedback loop 41 mainly has a feedback current source 42 and a resistance R 1 is connected in series mutually, is connected in this current sensing circuit 31, and this feedback current source 42 is to go out this current sensor I in order to mirror
SEN
Aforementioned circuit 10 is when operation, mainly be to provide power supply by this power supply driver 12 earlier, and seeing through this switch 14 provides power supply to the central processing unit (not shown) with the effect of this inductance L, this capacitor C 1, and its power supply mode is identical with known technology, holds and does not give unnecessary details.
This delay circuit 21 then is to be used for making the electric current of two input ends of this comparator circuit 32 to conform to, and whereby, this current sensing circuit 31 can be by the resistance R of this resistance DCR and this delay circuit 21
ISENBetween ratio and the electric current I on this inductance L
LObtain current sensor I
SEN, its formula as the formula (1):
This electric current feedback loop 41 is to be connected by this feedback current source 42 by the output terminal with this operational amplifier 34 and to obtain the electric current of equivalence in similar current mirror mode, and sees through this resistance R 1 electric current in this feedback current source 42 is detected.By this kind technology, this resistance R 1 is the electric current that can not have influence on this power supply circuit 11, and also can not have influence on by the measured current sensor I of formula (1)
SEN, under the condition that does not influence this two electric current, record correct current value.And then reach electric current is monitored, and more do not have the effect of error.
Each assembly that the utility model is taken off in embodiment is for illustrating; be not in order to limit claim of the present utility model; the replacement of other equivalent elements; revise; also should be claims protection domain of the present utility model and contain, actual range of the present utility model must be as the criterion with claims protection domain.
Claims (4)
1. real-time load current detection circuit of central processing unit includes:
One power supply circuit is in order to provide power supply to this central processing unit;
It is characterized in that, more include:
One delay circuit mainly has resistance and an electric capacity, is connected in this power supply circuit;
One current sensing circuit mainly has a comparator circuit, and this comparator circuit is connected in this delay circuit and this power supply circuit; And
One electric current feedback loop mainly has a feedback current source and a resistance, is connected in this current sensing circuit, and this feedback current source is to go out this current sensor in order to mirror.
2. according to the real-time load current detection circuit of the described central processing unit of claim 1, it is characterized in that the resistance of described this delay circuit is to be connected in series mutually with electric capacity.
3. according to the real-time load current detection circuit of the described central processing unit of claim 1, it is characterized in that the feedback current source of described this electric current feedback loop is to be connected in series with this resistance.
4. according to the real-time load current detection circuit of the described central processing unit of claim 1, it is characterized in that described this comparator circuit comprises an operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620117634 CN2909335Y (en) | 2006-05-30 | 2006-05-30 | Circuit for detecting real-time load current of central processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620117634 CN2909335Y (en) | 2006-05-30 | 2006-05-30 | Circuit for detecting real-time load current of central processor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2909335Y true CN2909335Y (en) | 2007-06-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620117634 Expired - Lifetime CN2909335Y (en) | 2006-05-30 | 2006-05-30 | Circuit for detecting real-time load current of central processor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2909335Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243521A (en) * | 2010-05-14 | 2011-11-16 | 鸿富锦精密工业（深圳）有限公司 | Mainboard power supply circuit |
| CN102073364B (en) * | 2009-11-19 | 2014-08-06 | 华硕电脑股份有限公司 | Multi-phase power supply device and current adjustment method thereof |
-
2006
- 2006-05-30 CN CN 200620117634 patent/CN2909335Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102073364B (en) * | 2009-11-19 | 2014-08-06 | 华硕电脑股份有限公司 | Multi-phase power supply device and current adjustment method thereof |
| CN102243521A (en) * | 2010-05-14 | 2011-11-16 | 鸿富锦精密工业（深圳）有限公司 | Mainboard power supply circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20081128 Address after: No. 1558 Chang Tung Road, integrated circuit Industrial Zone, Zhangjiang hi tech park, Shanghai, China: 201203 Co-patentee after: Huanlong Electric Co., Ltd. Patentee after: Huanxu Electronics Co., Ltd. Address before: Taiwan, Nantou County Province, china: Patentee before: Huanlong Electric Co., Ltd. |
|
| ASS | Succession or assignment of patent right |
Owner name: HUAN SOLECTRON JIANMEI ELECTRONICS CO LTD Free format text: FORMER OWNER: UNIVERSAL SCIENTIFIC INDUSTRIAL CO., LTD. Effective date: 20081128 |
|
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: HUANLONG ELECTRIC CO LTD |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20100730 Address after: Zhangjiang hi tech park integrated circuit industry Zhang Road 201203 Shanghai City No. 1558 Patentee after: Huanxu Electronics Co., Ltd. Address before: Zhangjiang hi tech park integrated circuit industry Zhang Road 201203 Shanghai City No. 1558 Co-patentee before: Huanlong Electric Co., Ltd. Patentee before: Huanxu Electronics Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070606 |
|
| EXPY | Termination of patent right or utility model |