CN1858715A - Temperature detecting and control circuit - Google Patents
Temperature detecting and control circuit Download PDFInfo
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- CN1858715A CN1858715A CN 200510070154 CN200510070154A CN1858715A CN 1858715 A CN1858715 A CN 1858715A CN 200510070154 CN200510070154 CN 200510070154 CN 200510070154 A CN200510070154 A CN 200510070154A CN 1858715 A CN1858715 A CN 1858715A
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Abstract
This invention provides a temperature test and control circuit including a first bleeder circuit, a second bleeder circuit, a fan rotation speed controller and a comparing circuit, in which, the first bleeder circuit outputs a first voltage, the second bleeder circuit outputs a second voltage and has a temperature-sensing electronic element to test the temperature of a piece of hardware, the comparing circuit receives and compares the two voltages and outputs the result to the fan rotation speed controller, which maintains a first speed when receiving a first control signal and maintains a second rotation speed when receiving a second control signal.
Description
Technical field
The invention relates to a kind of temperature detection and control circuit, and particularly relevant for a kind of temperature detection and control circuit that is used for computer system.
Background technology
The computer system volume is more and more littler now, but arithmetic speed is more and more faster.Many elements can send heat energy under high-speed computation, these heat can reduce the usefulness of computer system, even can damage system.Therefore, how heat radiation is very important problem to computer system.
Display card in the computer system owing to need to handle image computing at a high speed, therefore is easy to give birth to heat.Past display card serviceability temperature detects wafer, though can record detailed temperature, general gained result is often inaccurate, and expensive again.Aspect the control temperature, use PWM (pulse width modulation) IC to do the rotating speed control of fan in the past, but this mode complex and expensive comparatively.In addition, graphics processing unit (GPU is arranged on the display card usually, graphic processing unit) power circuit and memory power circuit, the display card of past Nvidia and ATI can be done input voltage control to the graphics processing unit power circuit, but the memory power circuit is not done input voltage control.
Therefore, be starved of a kind of cheap, simple temperature detection and control circuit and solve the problems referred to above.
Summary of the invention
Therefore purpose of the present invention is providing a kind of temperature detection and control circuit exactly, can reach by the simple and cheap hardware element of mat.
Another object of the present invention is that a kind of temperature detection and control circuit are being provided, and can inform user's temperature whether in normal temperature, and is unlikely overheated with the protection display card.
Another purpose of the present invention is that a kind of temperature detection and control circuit are being provided, and wherein the rotation speed of the fan controller can be taken into account heat dissipation and quiet requirement.
A further object of the present invention is that a kind of temperature detection and control circuit are being provided, wherein the rotation speed of the fan controller only uses transistor AND gate resistance, utilize voltage divider principle to come fan is done the control of two sections (high speed or low speed (or stall)), can reach control, control cost but reduce greatly to noise.
A further object of the present invention is that a kind of temperature detection and control circuit are being provided, can under operating system, increase graphics processing unit power circuit and memory power circuit voltage, make wafer have higher overclocking ability, also can downgrade by voltage, the whole thermal value of system is reduced.
According to above-mentioned purpose of the present invention, a kind of temperature detection and control circuit are proposed.According to a preferred embodiment of the present invention, temperature detection and control circuit comprise first bleeder circuit, second bleeder circuit, a rotation speed of the fan controller and a comparator circuit.First bleeder circuit receives a power supply and exports one first voltage.Second bleeder circuit receives this power supply and exports second voltage.Second bleeder circuit has a temperature sensible electronic component for the temperature that detects a hardware, and when the temperature change of this hardware, the impedance of temperature sensible electronic component changes, and makes second voltage change.
Comparator circuit receives first voltage and second voltage.When second voltage during greater than first voltage, comparator circuit output tertiary voltage.When second voltage during less than first voltage, comparator circuit is exported the 4th voltage.Tertiary voltage can be exchanged into the first fan control signal, and the 4th voltage can be exchanged into the second fan control signal.
The rotation speed of the fan controller is for controlling a fan so that hardware is dispelled the heat.When the rotation speed of the fan controller received the tertiary voltage or the first fan control signal, the rotation speed of the fan controller was kept first rotating speed.When receiving the 4th voltage or the second fan control signal, the rotation speed of the fan controller is kept second rotating speed.
In one embodiment, the rotation speed of the fan controller comprises a transistor and a resistance.Transistorized source electrode (source) ground connection, drain electrode (drain) is electrically connected at fan, and grid (gate) receives the first fan control signal or the second fan control signal.First end of resistance is electrically connected at transistor drain, the second end ground connection.
Wherein when transistorized grid receives the first fan control signal, transistor turns (turn on), and transistorized source electrode is exported first electric current.When transistorized grid received the second fan control signal, transistor was by (turn off), and second end of resistance is exported second electric current.
According to purpose of the present invention, a kind of temperature detection and control circuit are proposed, for the temperature of Detection ﹠ Controling one display card.According to a preferred embodiment of the present invention, this temperature detection and control circuit comprise draws together first bleeder circuit, second bleeder circuit and a comparator circuit.
First bleeder circuit receives a power supply and exports one first voltage.Second bleeder circuit receives this power supply and exports second voltage.Second bleeder circuit has a temperature sensible electronic component for the temperature that detects a display card.When the temperature change of display card, the impedance of temperature sensible electronic component changes, and makes second voltage change.
One comparator circuit receives first voltage and second voltage.When second voltage during greater than first voltage, comparator circuit output tertiary voltage.When second voltage during less than first voltage, comparator circuit is exported the 4th voltage.
Wherein display card comprises a memory power circuit (memory power circuit), and the output of comparator circuit is converted to a storer Control of Voltage signal and is sent to a transistorized grid.This transistor drain is electrically connected to the memory power circuit via a resistance.
The present invention has following advantage at least, and wherein each embodiment can have one or more advantages.Temperature detection of the present invention and control circuit can be reached by the simple and cheap hardware element of mat.Temperature detection of the present invention and control circuit can be informed user's temperature whether in normal temperature, and be unlikely overheated with the protection display card.Rotation speed of the fan controller of the present invention can be taken into account heat dissipation and quiet requirement.Rotation speed of the fan controller of the present invention only uses electric crystal and resistance, utilizes voltage divider principle to come fan is done the control of two sections (high speed or low speed (or stall)), can reach the control to noise, controls cost but reduce greatly.Temperature detection of the present invention and control circuit can increase graphics processing unit power circuit and memory power circuit voltage under operating system, make wafer have higher overclocking ability, also can downgrade by voltage, the whole thermal value of system is reduced.
Description of drawings
Fig. 1 has illustrated the action flow chart example of temperature detection of the present invention and control circuit;
Fig. 2 has illustrated the circuit diagram of an embodiment of temperature sensing circuit;
Fig. 3 has illustrated the circuit diagram of an embodiment of temperature sensing circuit;
Fig. 4 has illustrated an embodiment of rotation speed of the fan controller;
Fig. 5 has illustrated another embodiment of rotation speed of the fan controller; And
Fig. 6 has illustrated the embodiment of the input voltage control circuit of graphics processing unit power circuit and memory power circuit.
Embodiment
Fig. 1 has illustrated the action flow chart example of temperature detection of the present invention and control circuit.At first, detect the temperature (step 104) of a hardware (as display card).Then, decision allows the user adjust or utilizes an application software (application) to adjust the temperature (step 106) of display card automatically.Then, utilize the rotating speed of a fan to control the temperature (step 102) of display card or the voltage (step 108) of adjustment graphics processing unit power circuit (GPU, graphicprocessing unit) and storer (memory).
Fig. 2 has illustrated the circuit diagram of an embodiment of temperature sensing circuit.First bleeder circuit 201 receives a power supply 204 and exports first voltage 216.Second bleeder circuit 203 receives power supply 204 and exports second voltage 214.Second bleeder circuit 203 has a temperature sensible electronic component 212 for the temperature that detects a hardware.Temperature sensible electronic component 212 is placed on the position near hardware to be measured, for example back side of a graphics processing unit (GPU), or the position of close thermal source.When the temperature change of hardware, the impedance of temperature sensible electronic component 212 changes, and makes second voltage 214 change.
In one embodiment, first bleeder circuit 201 comprises first resistance 206 and second resistance 210.One end 222 of first resistance 206 is electrically connected at power supply 204.First end 224 of second resistance 210 is electrically connected at the second end ground connection of first resistance, 206, the second resistance 210.Wherein first end 224 of second resistance 210 is exported first voltage.
In one embodiment, second bleeder circuit 203 comprises the 3rd resistance 208 and temperature sensible electronic component 212.One end 226 of the 3rd resistance 208 is connected in power supply 204.First end 228 of temperature sensible electronic component 212 is electrically connected at the 3rd resistance 208, and second end of temperature sensible electronic component 212 electrically connects ground.First end, 228 outputs, second voltage of temperature sensible electronic component 212.Temperature sensible electronic component 212 is a thermistor (thermistor) for example.Comparator circuit 218 is an operational amplifier (operational amplifier) for example.In this embodiment, when the hardware temperatures rising, the thermistor impedance is risen, and tertiary voltage can be greater than the 4th voltage.
In one embodiment, when comparator circuit 218 output tertiary voltages, temperature sensing circuit is shown in a display with a temperature anomaly signal.When comparator circuit 218 outputs the 4th voltage, temperature sensing circuit is shown in a display with the normal signal of a temperature.Whether the user can understand the temperature of display card via display overheated, with the protection display card.A temperature sensing circuit displays temperature normal (pass) or two kinds of situations of temperature too high (fail) manifest and do not show precise dose numerical value with digital form.So can reach the function of temperature detection equally, but can significantly reduce the cost.When the rotation speed of the fan increase still can't allow hardware get back to normal temperature, can shut down automatically with protection hardware (display card).
This embodiment also can indirect detection has the whether function of fault of fan.When fan changes at full speed, but can't reduce the temperature of hardware (for example graphics processing unit (GPU)), the expression fan has problem.Can shut down automatically this moment with the protection graphics processing unit.
Fig. 3 has illustrated the circuit diagram of an embodiment of temperature sensing circuit.Fig. 3 is identical with Fig. 1 haply, and difference is that Fig. 3 has increased current potential and adjusted circuit 342 and current potential circuit for reversing 344.Because GPIO1 302 has certain input voltage specification, therefore the input voltage specification is out of style therewith when the output voltage of comparator circuit 328, must the output voltage of comparator circuit 328 be adjusted to the input voltage specification of GPIO 1 302 via some circuit to conform to.For example when comparator circuit 328 is output as 12 volts, need be converted to 3.3 volts.
Current potential is adjusted circuit 342 and is had resistance 346, resistance 348 and resistance 350.Current potential circuit for reversing 344 has transistor 356, resistance 352 and resistance 354.Via these resistance and transistorized parameter adjustment, the user can adjust the voltage that conforms to the input voltage specification of GPIO 302.
When using current potential to adjust circuit 342, can not need to use current potential circuit for reversing 344.But when using current potential circuit for reversing 344, still need resistance 346 and resistance 350.
Fig. 4 has illustrated an embodiment of rotation speed of the fan controller.Rotation speed of the fan controller 400 is for controlling a fan 404 so that a hardware is dispelled the heat.When rotation speed of the fan controller 400 received the first fan control signal, rotation speed of the fan controller 400 was kept first rotating speed.When rotation speed of the fan controller 400 received the second fan control signal, rotation speed of the fan controller 400 was kept second rotating speed.
When rotation speed of the fan was fast, heat-sinking capability was good, but it is bigger to produce noise.When rotation speed of the fan was low, heat-sinking capability was not good, but it is less to produce noise.Therefore the design of rotation speed of the fan controller must be accepted or rejected between heat-sinking capability and noise.
Rotation speed of the fan controller 400 comprises a transistor 408 and a resistance 406.The source electrode of transistor 408 (source) 416 is electrically connected at ground, and the drain electrode of transistor 408 (drain) 414 is electrically connected at fan 404, and the grid of transistor 408 (gate) 412 receives the first fan control signal or the second fan control signal.
Drain electrode 414, the second ends that resistance 406 first ends are electrically connected at transistor 408 are electrically connected at ground.When the grid 412 of electric crystal 408 receives the first fan control signal, transistor 408 conductings (turnon).The drain electrode 414 of transistor 408 produces first electric current.
When the grid gate 412 of transistor 408 received the second fan control signal, transistor 408 was by (turn off), and resistance 406 produces second electric current.This moment, the dividing potential drop relation of fan 404 and resistance 406 changed, and the dividing potential drop that fan 404 is accepted diminishes, and (power's electric power that fan 404 is received P=I*V) descends, so rotation speed of the fan reduces.
Fig. 5 has illustrated another embodiment of rotation speed of the fan controller.The drain electrode of transistor 516 is electrically connected at fan 514, and the source electrode of transistor 516 is electrically connected at power supply 504, and the grid of transistor 516 receives the first fan control signal or the second fan control signal.First end 510 of resistance 508 is electrically connected at the source electrode of transistor 516, and second end 512 of resistance 508 is electrically connected at the drain electrode of transistor 516.
When the grid 520 of transistor 516 received the first fan control signal, transistor 516 was by (turnoff), and resistance 508 is exported first electric current.This moment, the dividing potential drop relation of fan 514 and resistance 508 changed, and the dividing potential drop that fan 514 is accepted diminishes, and (power P=I*V) descend, so rotation speed of the fan is slack-off for the electric power that fan 514 is received.When the grid of transistor 516 receives the second fan control signal, transistor 516 conductings (turn on), second electric current is exported in the drain electrode of transistor 516.
Fig. 6 has illustrated the embodiment of the input voltage control circuit of graphics processing unit power circuit and memory power circuit.Display card has a graphics processing unit power circuit (GPU power circuit) 604 and one memory power circuit (memory power circuit) 602.The voltage of rising graphics processing unit power circuit 604 and memory power circuit 602 can make wafer have higher overclocking ability.Certainly reducing voltage can make the thermal value of system reduce.
The output of comparator circuit (for example 218 of Fig. 2) is converted to a graphics processing unit Control of Voltage signal, is sent to the grid 628 of the first transistor 620 via a GPIO 3 606.The drain electrode of the first transistor 628 is electrically connected to graphics processing unit power circuit 604 via first resistance 616.The output of comparator circuit is converted to a storer Control of Voltage signal, is sent to the grid of transistor seconds 622 via GPIO 3 606, and the drain electrode of transistor seconds 622 is electrically connected to memory power circuit 602 via second resistance 618.In this embodiment, graphics processing unit Control of Voltage signal has identical source with storer Control of Voltage signal.
In one embodiment, a soft start (soft start) circuit 624 can place between the grid of the output of comparator circuit and the first transistor 620.Soft starting circuit 624 comprises resistance 642 and an electric capacity 644.Same, another soft starting circuit 626 also can place between the grid of the output of comparator circuit and transistor seconds 622.Soft starting circuit 626 comprises resistance 638 and an electric capacity 640.
The circuit of Fig. 6 can make transistor 622 conductings via GPIO 606, and then make resistance 618 and the Control of Voltage resistance of memory power circuit 602 voltage that changes memory power circuit 602 in parallel, simultaneously also make transistor 620 conductings, and then make resistance 616 and the Control of Voltage resistance of graphics processing unit power circuit 604 voltage that changes graphics processing unit power circuit 604 in parallel.Otherwise, also can contrary operation, utilize GPIO 606 that transistor 622 and 620 is ended to change the voltage of graphics processing unit power circuit 604 and memory power circuit 602.Adding soft starting circuit 626 and 624 can avoid voltage up-down to cause producing under the operating system (for example Microsoft Window) failure fast when situations such as machines.
Temperature detection of the present invention and control circuit can be reached by the simple and cheap hardware element of mat.Temperature detection of the present invention and control circuit can be informed user's temperature whether in normal temperature, and be unlikely overheated with the protection display card.Rotation speed of the fan controller of the present invention can be taken into account heat dissipation and quiet requirement.Rotation speed of the fan controller of the present invention only uses electric crystal and resistance, utilizes voltage divider principle to come fan is done the control of two sections (high speed or low speed (or stall)), can reach the control to noise, controls cost but reduce greatly.Temperature detection of the present invention and control circuit can increase graphics processing unit power circuit and memory power circuit voltage at the following of operating system, make wafer have higher overclocking ability, also can downgrade by voltage, the whole thermal value of system is reduced.Though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly be familiar with present technique field person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (16)
1. temperature detection and control circuit comprise:
First bleeder circuit receives a power supply and exports first voltage;
Second bleeder circuit receives this power supply and exports second voltage, and this second bleeder circuit has a temperature sensible electronic component for the temperature that detects a hardware, and when the temperature change of this hardware, the impedance of this temperature sensible electronic component changes, and makes this second voltage change;
One comparator circuit receives this first voltage and this second voltage, and when this second voltage during greater than this first voltage, this comparator circuit is exported this tertiary voltage, and when this second voltage during less than this first voltage, this comparator circuit is exported the 4th voltage.
2. temperature detection as claimed in claim 1 and control circuit is characterized in that, this first bleeder circuit comprises:
First resistance, an end is electrically connected at this power supply; And
Second resistance, first end are electrically connected at this first resistance, the second end ground connection, and wherein first end of this second resistance is exported this first voltage.
3. temperature detection as claimed in claim 1 and control circuit is characterized in that, this second bleeder circuit comprises:
The 3rd resistance, an end is connected in this power supply, and wherein first end of this temperature sensible electronic component is electrically connected at the 3rd resistance, and second end of this temperature sensible electronic component electrically connects ground, and first end of this temperature sensible electronic component is exported this second voltage.
4. temperature detection as claimed in claim 1 and control circuit is characterized in that, this temperature sensible electronic component is a thermistor.
5. temperature detection as claimed in claim 1 and control circuit is characterized in that, this comparator circuit is an operational amplifier.
6. temperature detection as claimed in claim 1 and control circuit, it is characterized in that, also comprise a rotation speed of the fan controller, this rotation speed of the fan controller is controlled a fan this display card is dispelled the heat the corresponding first fan control signal of this tertiary voltage, the corresponding second fan control signal of the 4th voltage, when receiving the first fan control signal, this rotation speed of the fan controller is kept first rotating speed, and when receiving the second fan control signal, this rotation speed of the fan controller is kept second rotating speed.
7. temperature detection as claimed in claim 6 and control circuit is characterized in that, this rotation speed of the fan controller comprises:
One transistor, its source ground, drain electrode is electrically connected at this fan, and grid receives this first fan control signal or this second fan control signal; And
One resistance, first end is electrically connected at this transistor drain, the second end ground connection;
Wherein when this transistorized grid receives this first fan control signal, this transistor turns, this transistorized source electrode is exported first electric current, when this transistorized grid receives this second fan control signal, this transistor ends, and second end of this resistance is exported second electric current.
8. temperature detection as claimed in claim 6 and control circuit is characterized in that, this rotation speed of the fan controller comprises:
One transistor, its drain electrode is electrically connected at this fan, and source electrode is electrically connected at this power supply, and grid receives this first fan control signal or this second fan control signal; And
One resistance, first end is electrically connected at the source electrode of electric transistor, and second end is electrically connected at this transistor drain;
Wherein when this transistorized grid received this first fan control signal, this transistor ended, and this resistance is exported first electric current, when this transistorized grid receives this second fan control signal, and this transistor turns, this transistor drain is exported second electric current.
9. temperature detection as claimed in claim 1 and control circuit, it is characterized in that, when this comparator circuit is exported this tertiary voltage, this temperature detection and control circuit are shown in a display with a temperature anomaly signal, when this comparator circuit was exported the 4th voltage, this temperature detection and control circuit were shown in a display with the normal signal of a temperature.
10. temperature detection as claimed in claim 1 and control circuit is characterized in that, this comparator circuit is connected in this rotation speed of the fan controller via a general purposes output and input pins.
11. temperature detection as claimed in claim 1 and control circuit is characterized in that, this hardware is a display card.
12. temperature detection as claimed in claim 11 and control circuit, it is characterized in that, this display card comprises a graphics processing unit power circuit and a memory power circuit, the output of this comparator circuit is converted to the grid that a storer Control of Voltage signal is sent to the first transistor, the drain electrode of this first transistor is electrically connected to this graphics processing unit power circuit via first resistance, the output of this comparator circuit also is converted to the grid that a storer Control of Voltage signal is sent to transistor seconds, and the drain electrode of this transistor seconds is electrically connected to this memory power circuit via second resistance.
13. temperature detection as claimed in claim 12 and control circuit is characterized in that, also comprise a soft starting circuit, place between the grid of the output of this comparator circuit and this first transistor.
14. temperature detection as claimed in claim 13 and control circuit is characterized in that, this soft starting circuit comprises resistance and an electric capacity.
15. temperature detection as claimed in claim 12 and control circuit is characterized in that, also comprise a soft starting circuit, place between the grid of the output of this comparator circuit and this transistor seconds.
16. temperature detection as claimed in claim 15 and control circuit is characterized in that, this soft starting circuit comprises resistance and an electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100701549A CN100380340C (en) | 2005-04-30 | 2005-04-30 | Temperature detecting and control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100701549A CN100380340C (en) | 2005-04-30 | 2005-04-30 | Temperature detecting and control circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN1858715A true CN1858715A (en) | 2006-11-08 |
| CN100380340C CN100380340C (en) | 2008-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100701549A Active CN100380340C (en) | 2005-04-30 | 2005-04-30 | Temperature detecting and control circuit |
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| Country | Link |
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| CN (1) | CN100380340C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435109C (en) * | 2006-12-19 | 2008-11-19 | 威盛电子股份有限公司 | Digital temperature sensing system |
| CN102465909A (en) * | 2010-11-01 | 2012-05-23 | 协禧电机股份有限公司 | Fan rotating speed controlling circuit |
| CN103323134A (en) * | 2013-06-13 | 2013-09-25 | 成都联腾动力控制技术有限公司 | Motor controller overheating judging circuit |
| CN103428952A (en) * | 2012-05-25 | 2013-12-04 | 原景科技股份有限公司 | Driving current control circuit and operating method thereof |
| CN105045705A (en) * | 2015-07-08 | 2015-11-11 | 浪潮电子信息产业股份有限公司 | Power consumption monitoring unit and system |
| CN110796989A (en) * | 2019-11-08 | 2020-02-14 | 广州小鹏汽车科技有限公司 | Control circuit of display screen, display screen and vehicle |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2450413Y (en) * | 2000-10-26 | 2001-09-26 | 建准电机工业股份有限公司 | Two-stage rotating speed controlled fan motor |
| JP3773245B2 (en) * | 2002-09-17 | 2006-05-10 | ケル株式会社 | Fan drive control circuit |
| EP1616463B1 (en) * | 2003-04-22 | 2015-06-10 | Panasonic Corporation | High-frequency dielectric heating device and printed board with thermistor |
| CN2629119Y (en) * | 2003-05-14 | 2004-07-28 | 联想(北京)有限公司 | Mouse |
| FR2858137B1 (en) * | 2003-07-24 | 2006-01-27 | Valeo Climatisation | SYSTEM FOR CONTROLLING THE SPEED OF A MOTOR-FAN MOTOR, IN PARTICULAR FOR A HEATING AND / OR AIR CONDITIONING INSTALLATION OF A MOTOR VEHICLE |
| CN1297860C (en) * | 2003-09-27 | 2007-01-31 | 台达电子工业股份有限公司 | Motor speed controller |
-
2005
- 2005-04-30 CN CNB2005100701549A patent/CN100380340C/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100435109C (en) * | 2006-12-19 | 2008-11-19 | 威盛电子股份有限公司 | Digital temperature sensing system |
| CN102465909A (en) * | 2010-11-01 | 2012-05-23 | 协禧电机股份有限公司 | Fan rotating speed controlling circuit |
| CN102465909B (en) * | 2010-11-01 | 2014-12-10 | 协禧电机股份有限公司 | Fan rotating speed controlling circuit |
| CN103428952A (en) * | 2012-05-25 | 2013-12-04 | 原景科技股份有限公司 | Driving current control circuit and operating method thereof |
| CN103323134A (en) * | 2013-06-13 | 2013-09-25 | 成都联腾动力控制技术有限公司 | Motor controller overheating judging circuit |
| CN105045705A (en) * | 2015-07-08 | 2015-11-11 | 浪潮电子信息产业股份有限公司 | Power consumption monitoring unit and system |
| CN105045705B (en) * | 2015-07-08 | 2018-02-23 | 浪潮电子信息产业股份有限公司 | A kind of power consumption monitoring unit and system |
| CN110796989A (en) * | 2019-11-08 | 2020-02-14 | 广州小鹏汽车科技有限公司 | Control circuit of display screen, display screen and vehicle |
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| Publication number | Publication date |
|---|---|
| CN100380340C (en) | 2008-04-09 |
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