CN204041500U - A kind of fan control circuitry - Google Patents
A kind of fan control circuitry Download PDFInfo
- Publication number
- CN204041500U CN204041500U CN201420424310.1U CN201420424310U CN204041500U CN 204041500 U CN204041500 U CN 204041500U CN 201420424310 U CN201420424310 U CN 201420424310U CN 204041500 U CN204041500 U CN 204041500U
- Authority
- CN
- China
- Prior art keywords
- fan
- amplifier
- resistance
- triode
- control circuitry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a kind of fan control circuitry; By including amplifier comparison circuit, sample circuit and triode Q1; Controlled the access electric current of fan by triode Q1 after the fan electrical current that sample circuit is adopted by described amplifier comparison circuit and given fan voltage reference value compare; It achieves the control utilizing less device to realize to fan, and alleviate fan on power supply and other circuit impact fan control circuitry.
Description
Technical field
The utility model relates to a kind of fan control circuitry.
Background technique
At present, existing fan control circuitry generally can be regulated by PWM, and therefore to there is current ripples large for circuit, accessory power supply is impacted large, thus bring larger interference to other circuit, and this type of circuit constantly carries out switch motion to fan, also can bring certain influence to the life-span of fan.Also have in addition and carry out Regulation Control by BUCK circuit, this kind of circuit needs inductance, electric capacity, and PWMIC, and circuit is complicated, and volume is large; Therefore market needs a kind of a kind of fan control circuitry that can effectively solve the problem badly.
Model utility content
The purpose of this utility model is to overcome above-described shortcoming, provides a kind of control utilizing less device to realize to fan, and alleviate fan on power supply and other circuit impact fan control circuitry.
For achieving the above object, concrete scheme of the present utility model is as follows: fan control circuitry, includes amplifier comparison circuit, sample circuit and triode Q1; Controlled the access electric current of fan by triode Q1 after the fan electrical current that sample circuit is adopted by described amplifier comparison circuit and given fan voltage reference value compare.
Further, described amplifier comparison circuit includes amplifier U1, and described amplifier U1 includes amplifier U1A, amplifier U1B, power port U1C;
Described sample circuit includes fan voltage port FAN-Power1, resistance R7 and resistance R6, and described resistance R7 and resistance R6 is series between fan voltage port FAN-Power1 and ground;
Described amplifier U1B, an one input end gathers fan voltage by resistance R7 and resistance R6 connecting place, and its another input end inputs given fan maximum voltage reference value;
Described amplifier U1A, an one input end input fan control signal, the fan electrical current of the fan port FAN-Power1 that the input of another input end is adopted; The output terminal of described amplifier U1A is connected with the output terminal of described amplifier U1B;
The power port U1C of described amplifier U1, its one end VCC is connected with the base stage of triode Q1, its other one end ground connection;
Described triode Q1, its emitter is connected with power supply, and its base stage is connected with power supply with by resistance R1, and its collector electrode is connected with one end of electric capacity C1;
Described amplifier comparison circuit also includes electric capacity C1 and resistance R2, and the other end of described electric capacity C1 is by resistance R2 ground connection.
Further, described amplifier comparison circuit also includes electric capacity C2, electric capacity C3; Described electric capacity C2 is connected between the output terminal of amplifier U1A and another input end; Described electric capacity C3 is connected between the output terminal of amplifier U1B and another input end.
Further, amplifier comparison circuit also includes resistance R4, and described resistance R4 is located between the output terminal of amplifier U1A and the output terminal of described amplifier U1B.
Further, also include diode D1, one end of the positive pole contact resistance R4 of described diode D1, the negative pole of described diode D1 connects the output terminal of amplifier U1B.
Further, described triode Q1 is PNP triode.
The beneficial effects of the utility model are: by including amplifier comparison circuit, sample circuit and triode Q1; Controlled the access electric current of fan by triode Q1 after the fan electrical current that sample circuit is adopted by described amplifier comparison circuit and given fan voltage reference value compare; It achieves the control utilizing less device to realize to fan, and alleviate fan on power supply and other circuit impact fan control circuitry.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Being described in further detail the utility model below in conjunction with the drawings and specific embodiments, is not that practical range of the present utility model is confined to this.
As shown in Figure 1, the fan control circuitry described in the present embodiment, includes amplifier comparison circuit, sample circuit and triode Q1; Controlled the access electric current of fan by triode Q1 after the fan electrical current that sample circuit is adopted by described amplifier comparison circuit and given fan voltage reference value compare.Fan control circuitry described in the present embodiment, described amplifier comparison circuit includes amplifier U1, and described amplifier U1 includes amplifier U1A, amplifier U1B, power port U1C; Described sample circuit includes fan voltage port FAN-Power1, resistance R7 and resistance R6, and described resistance R7 and resistance R6 is series between fan voltage port FAN-Power1 and ground; Described amplifier U1B, an one input end gathers fan voltage by resistance R7 and resistance R6 connecting place, and its another input end inputs given fan maximum voltage reference value; Described amplifier U1A, an one input end input fan control signal, the fan electrical current of the fan voltage port FAN-Power1 that the input of another input end is adopted; The output terminal of described amplifier U1A is connected with the output terminal of described amplifier U1B; The power port U1C of described amplifier U1, its one end is connected with the base stage of triode Q1, its other one end ground connection; Described triode Q1, its emitter is connected with power supply, and its base stage is connected with power supply with by resistance R1, and its collector electrode is connected with one end of electric capacity C1; Electric capacity C1 is used for carrying out filtering to the high frequency current of fan.Described amplifier comparison circuit also includes electric capacity C1 and resistance R2, and the other end of described electric capacity C1 is by resistance R2 ground connection.Fan control circuitry described in the present embodiment, described amplifier comparison circuit also includes electric capacity C2, electric capacity C3; Described electric capacity C2 is connected between the output terminal of amplifier U1A and another input end; Described electric capacity C3 is connected between the output terminal of amplifier U1B and another input end.Fan control circuitry described in the present embodiment, amplifier comparison circuit also includes resistance R4, and described resistance R4 is located between the output terminal of amplifier U1A and the output terminal of described amplifier U1B.
Fan control circuitry described in the present embodiment, also includes diode D1, one end of the positive pole contact resistance R4 of described diode D1, and the negative pole of described diode D1 connects the output terminal of amplifier U1B.Fan control circuitry described in the present embodiment, described triode Q1 is PNP triode.
Resistance R2 is mainly used in sampling to fan electrical current; In Fig. 1, the signal of FAN_CON_REF end is used to given fan voltage reference value.During work, when fan voltage is less than threshold limit value, the output terminal level of amplifier U1B is zero, amplifier U1A to be compared by the signal adopted fan control signal (in figure FAN_SPEED end) and resistance R2, and exporting certain level is that these two signals reach a balance.And the electric current flowing through resistance R4 is provided by an end of the power end U1C of amplifier, the base stage of triode Q1 can be have passed through by this electric current simultaneously, be the base current of triode Q1, as the control current signal of fan; Therefore whole loop defines with degenerative control loop; By including amplifier comparison circuit, sample circuit and triode Q1; Controlled the access electric current of fan by triode Q1 after the fan voltage that sample circuit is adopted by described amplifier comparison circuit and given fan voltage reference value compare; It achieves the control utilizing less device to realize to fan, and alleviate fan on power supply and other circuit impact fan control circuitry.
The above is only a preferred embodiment of the present utility model, therefore all equivalences done according to structure, feature and the principle described in the utility model patent claim change or modify, and are included in the protection domain of the utility model patent application.
Claims (6)
1. a fan control circuitry, is characterized in that, includes amplifier comparison circuit, sample circuit and triode Q1; Controlled the access electric current of fan by triode Q1 after the fan voltage that sample circuit is adopted by described amplifier comparison circuit and given fan voltage reference value compare.
2. a kind of fan control circuitry according to claim 1, is characterized in that, described amplifier comparison circuit includes amplifier U1, and described amplifier U1 includes amplifier U1A, amplifier U1B, power port U1C;
Described sample circuit includes fan voltage port FAN-Power1, resistance R7 and resistance R6, and described resistance R7 and resistance R6 is series between fan voltage port FAN-Power1 and ground;
Described amplifier U1B, an one input end gathers fan voltage by resistance R7 and resistance R6 connecting place, and its another input end inputs given fan voltage reference value;
Described amplifier U1A, an one input end input fan control signal, the fan electrical current of the fan voltage port FAN-Power1 that the input of another input end is adopted; The output terminal of described amplifier U1A is connected with the output terminal of described amplifier U1B;
The power port U1C of described amplifier U1, its one end VCC is connected with the base stage of triode Q1, its other one end ground connection;
Described triode Q1, its emitter is connected with power supply, and its base stage is connected with power supply with by resistance R1, and its collector electrode is connected with one end of electric capacity C1;
Described amplifier comparison circuit also includes electric capacity C1 and resistance R2, and the other end of described electric capacity C1 is by resistance R2 ground connection.
3. a kind of fan control circuitry according to claim 2, is characterized in that, described amplifier comparison circuit also includes electric capacity C2, electric capacity C3; Described electric capacity C2 is connected between the output terminal of amplifier U1A and another input end; Described electric capacity C3 is connected between the output terminal of amplifier U1B and another input end.
4. a kind of fan control circuitry according to claim 2, is characterized in that, amplifier comparison circuit also includes resistance R4, and described resistance R4 is located between the output terminal of amplifier U1A and the output terminal of described amplifier U1B.
5. a kind of fan control circuitry according to claim 4, is characterized in that, also includes diode D1, one end of the positive pole contact resistance R4 of described diode D1, and the negative pole of described diode D1 connects the output terminal of amplifier U1B.
6. a kind of fan control circuitry according to claim 1, is characterized in that, described triode Q1 is PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424310.1U CN204041500U (en) | 2014-07-30 | 2014-07-30 | A kind of fan control circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420424310.1U CN204041500U (en) | 2014-07-30 | 2014-07-30 | A kind of fan control circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204041500U true CN204041500U (en) | 2014-12-24 |
Family
ID=52242169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420424310.1U Expired - Fee Related CN204041500U (en) | 2014-07-30 | 2014-07-30 | A kind of fan control circuitry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204041500U (en) |
-
2014
- 2014-07-30 CN CN201420424310.1U patent/CN204041500U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141224 Termination date: 20170730 |