CN215871155U - Fan rotating speed control circuit - Google Patents
Fan rotating speed control circuit Download PDFInfo
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- CN215871155U CN215871155U CN202122181267.3U CN202122181267U CN215871155U CN 215871155 U CN215871155 U CN 215871155U CN 202122181267 U CN202122181267 U CN 202122181267U CN 215871155 U CN215871155 U CN 215871155U
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Abstract
The utility model discloses a fan rotating speed control circuit, which comprises a voltage conversion circuit, wherein the voltage conversion circuit is mainly formed by connecting a power switch circuit consisting of triodes and a power step-down circuit consisting of voltage-stabilizing tubes in parallel, the circuit is controlled by a control signal, when the control signal is at a low level, the power switch circuit consisting of the triodes is switched off, the power step-down circuit consisting of the voltage-stabilizing tubes works to output a low voltage, namely the power voltage subtracts the voltage of the voltage-stabilizing tubes, when the control signal is at a high level, the power step-down circuit consisting of the voltage-stabilizing tubes does not work, and the power switch circuit consisting of the triodes is switched on to directly output a high voltage, namely the power voltage. The utility model constructs the voltage conversion circuit which is connected with the controlled power supply voltage reduction circuit and the power supply switch circuit in parallel through the separating device, realizes the speed change control of half speed and full speed of the fan, saves control devices such as a CPU and the like, and reduces the cost.
Description
Technical Field
The utility model belongs to the technical field of electronic circuits, and particularly relates to a fan rotating speed control circuit.
Background
The rotation speed control scheme of the fan with a speed-adjusting heat-dissipating fan generally uses an MCU to generate a PWM signal to be input to a PWM pin of the fan to achieve the purpose of controlling the rotation speed. However, in many application occasions, the fan does not need to be subjected to stepless speed regulation, and only the fan needs to be simply controlled to reach two states of half rotating speed or full rotating speed, so the utility model saves cost, considers that the MCU is not used for control, and realizes the two control states of half rotating speed or full rotating speed by forming a control circuit by a separating device, thereby achieving the purpose of adjusting the rotating speed of the fan.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a low-cost fan rotating speed control circuit composed of discrete devices.
In order to solve the problems, the technical scheme adopted by the utility model is as follows:
a fan rotation speed control circuit comprises a voltage conversion circuit, wherein the voltage conversion circuit is mainly formed by connecting a power switch circuit consisting of triodes and a power step-down circuit consisting of voltage-stabilizing tubes in parallel, the circuit is controlled by a control signal, when the control signal is at a low level, the power switch circuit consisting of the triodes is switched off, the power step-down circuit consisting of the voltage-stabilizing tubes works to output a low voltage, namely the power voltage subtracts the voltage of the voltage-stabilizing tubes, when the control signal is at a high level, the power step-down circuit consisting of the voltage-stabilizing tubes does not work, and the power switch circuit consisting of the triodes is switched on to directly output a high voltage, namely the power voltage.
Further, the voltage conversion circuit comprises triodes Q1 and Q2, resistors R1, R3, R4, a voltage regulator tube D1 and a capacitor C1, wherein an emitter of the triode Q1 is grounded, a base of the triode Q1 is connected with a collector of a control signal Fin triode Q1 through a resistor R1 and is sequentially connected with a power supply VCC through resistors R3 and R4, a connecting node of the resistor R3 and the R4 is connected with a base of the triode Q2, an emitter of the triode Q2 is connected with the power supply VCC, a collector of the triode Q2 is connected with an output VCC _ FAN, an anode of the voltage regulator tube D1 is connected with an emitter of the triode Q2, and a cathode of the voltage regulator tube D1 is connected with a base capacitor C1 and is connected between the base and the emitter of the triode Q1.
Further, a capacitor C2 is included and connected in parallel between the output VCC _ FAN and ground for output filtering.
Further, the high-speed rectification circuit further comprises a diode D2, wherein the diode D2 is a fast recovery diode, the anode of the diode D2 is connected with the output VCC _ FAN, and the cathode of the diode D2 is grounded and used for freewheeling.
Further, the FAN plug further comprises a socket CN1, two pins of the socket are respectively connected to the output VCC _ FAN and the ground, and the socket is used for realizing quick plugging and unplugging of the FAN.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the utility model constructs the voltage conversion circuit which is connected with the controlled power supply voltage reduction circuit and the power supply switch circuit in parallel through the separating device, realizes the speed change control of half speed and full speed of the fan, saves control devices such as a CPU and the like, and reduces the cost.
Drawings
FIG. 1 is a circuit schematic of the present invention;
Detailed Description
The utility model is described in further detail below with reference to the attached drawings:
the utility model relates to a fan rotating speed control circuit, which comprises a voltage conversion circuit, wherein the voltage conversion circuit is mainly formed by connecting a power switch circuit consisting of triodes and a power step-down circuit consisting of voltage-stabilizing tubes in parallel, when a control signal is at a low level, the power switch circuit consisting of the triodes is switched off, the power step-down circuit consisting of the voltage-stabilizing tubes works to output a low voltage, namely the power voltage subtracts the voltage of the voltage-stabilizing tubes, when the control signal is at a high level, the power step-down circuit consisting of the voltage-stabilizing tubes does not work, and the power switch circuit consisting of the triodes is switched on to directly output a high voltage, namely the power voltage. The circuit is controlled by a control signal to realize voltage conversion and further realize half-speed or full-speed conversion control of the fan, an MCU is not used for controlling, a simple circuit constructed by discrete devices is used for controlling the power supply voltage of the fan, and the purpose of adjusting the rotating speed of the fan is achieved.
As shown in fig. 1, the voltage conversion circuit of the present invention includes triodes Q1, Q2, resistors R1, R3, R4, a regulator D1 and a capacitor C1, wherein an emitter of the triode Q1 is grounded, a base of the triode Q1 is connected to a collector of the control signal Fin triode Q1 through a resistor R1, and is sequentially connected to a power VCC through resistors R3 and R4, a connection node of the resistor R3 and the R4 is connected to a base of the triode Q2, an emitter of the triode Q2 is connected to the power VCC, a collector of the triode Q2 is connected to the output VCC _ FAN, an anode of the regulator D1 is connected to an emitter of the triode Q2, and a cathode of the regulator D1 is connected to the base capacitor C1 of the triode and is connected between the base and the emitter of the triode Q1.
The triode Q1, the resistors R1, R3 and R4, the voltage regulator tube D1 and the capacitor C1 form a power supply voltage reduction circuit, and the triodes Q1 and Q2, the resistors R1, R3 and R4 and the capacitor C1 form a power supply switch circuit.
When the input signal Fin is at a low level, the triode Q1 is cut off, the voltage between the base electrode and the collector electrode of the triode Q2 is clamped to the stable voltage of the voltage regulator tube by the voltage regulator tube D1, VCC _ FAN is output to VCC-D1, the stable voltage parameter of the voltage regulator tube D1 is reasonably selected, and the voltage V _ half required by the half-rotating speed of the FAN can be obtained, so that the FAN is in the half-rotating speed state.
When the input signal Fin is at a high level, the triode Q1 is turned on, the triode Q2 is turned on, the voltage regulator tube D1 does not work, the output VCC _ FAN is approximately equal to VCC, that is, the power supply voltage of the FAN is equal to the power supply voltage, and the FAN is in a full-speed state.
In order to stabilize the output voltage and prevent the unrecoverable damage to the circuit caused by the spike voltage when the FAN stops, the present invention further includes a capacitor C2 connected in parallel between the output VCC _ FAN and ground for output filtering, and a diode D2. The diode D2 is a fast recovery diode, the anode of the diode D2 is connected with the output VCC _ FAN, and the cathode of the diode D2 is grounded and used for freewheeling.
In order to facilitate replacement of the FAN, the circuit further comprises a socket CN1, two pins of the socket are respectively connected to the output VCC _ FAN and the ground, and the socket is used for realizing quick plugging and unplugging of the FAN.
The specific embodiment is as follows:
the working voltage of the fan is 12V, and the voltage stabilizing tube D1 selects a voltage stabilizing tube of 3.9V. Namely VCC is 12V, when Fin is high level, the FAN voltage VCC _ FAN is 12V, and the FAN is in full rotation state; when Fin is low, the FAN voltage VCC _ FAN is approximately equal to 12V-3.9V-8.1V, and the FAN is in a half-rotation state.
Claims (5)
1. A kind of fan rotational speed control circuit, characterized by that: the voltage conversion circuit is mainly formed by connecting a power switch circuit consisting of triodes and a power step-down circuit consisting of voltage-stabilizing tubes in parallel, the circuit is controlled by a control signal, when the control signal is at a low level, the power switch circuit consisting of the triodes is switched off, the power step-down circuit consisting of the voltage-stabilizing tubes works to output a low voltage, namely the voltage of the voltage-stabilizing tubes is subtracted from the power voltage, when the control signal is at a high level, the power step-down circuit consisting of the voltage-stabilizing tubes does not work, and the power switch circuit consisting of the triodes is switched on to directly output a high voltage, namely the power voltage.
2. The fan speed control circuit of claim 1, wherein: the voltage conversion circuit comprises triodes Q1 and Q2, resistors R1, R3 and R4, a voltage regulator tube D1 and a capacitor C1, wherein an emitting electrode of the triode Q1 is grounded, a base electrode of the triode Q1 is connected with a collector electrode of a control signal Fin triode Q1 through a resistor R1 and is sequentially connected with a power supply VCC through resistors R3 and R4, a connecting node of a resistor R3 and the R4 is connected with a base electrode of the triode Q2, an emitting electrode of the triode Q2 is connected with the power supply VCC, a collector electrode of the triode Q2 is connected with an output VCC _ FAN, an anode of a voltage regulator tube D1 is connected with an emitting electrode of the triode Q2, and a cathode of a voltage regulator tube D1 is connected with a base electrode capacitor C1 and is connected between the base electrode and the emitting electrode of the triode Q1.
3. A fan speed control circuit according to claim 1 or 2, wherein: also included is a capacitor C2 connected in parallel between the output VCC _ FAN and ground for output filtering.
4. A fan speed control circuit as claimed in claim 3, wherein: the high-speed direct current power supply further comprises a diode D2, the diode D2 is a fast recovery diode, the anode of the diode D2 is connected with the output VCC _ FAN, and the cathode of the diode D2 is grounded and used for freewheeling.
5. The fan speed control circuit of claim 4, wherein: the FAN plug further comprises a socket CN1, two pins of the socket are respectively connected with the output VCC _ FAN and the ground, and the socket is used for realizing quick plugging of the FAN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122181267.3U CN215871155U (en) | 2021-09-09 | 2021-09-09 | Fan rotating speed control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122181267.3U CN215871155U (en) | 2021-09-09 | 2021-09-09 | Fan rotating speed control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215871155U true CN215871155U (en) | 2022-02-18 |
Family
ID=80258191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122181267.3U Active CN215871155U (en) | 2021-09-09 | 2021-09-09 | Fan rotating speed control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215871155U (en) |
-
2021
- 2021-09-09 CN CN202122181267.3U patent/CN215871155U/en active Active
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