CN217233862U - Power supply control circuit for fan - Google Patents
Power supply control circuit for fan Download PDFInfo
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- CN217233862U CN217233862U CN202123421537.XU CN202123421537U CN217233862U CN 217233862 U CN217233862 U CN 217233862U CN 202123421537 U CN202123421537 U CN 202123421537U CN 217233862 U CN217233862 U CN 217233862U
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Abstract
The utility model relates to an electronic circuit technical field discloses a fan power supply control circuit, including sampling circuit, drive circuit and switching circuit: the sampling circuit converts the voltage control signal PVCC output from the main control IC into a first voltage control signal V4; the driving circuit receives the first voltage control signal V4 and the voltage signal output by the auxiliary source, and outputs a second voltage control signal V5 according to the first voltage control signal V4 and the auxiliary source output signal; the switching circuit receives the second voltage control signal V5 and the auxiliary source output signal, and outputs a fan supply voltage according to the second voltage control signal V5 and the auxiliary source output signal to control the operation and the shutdown of the fan. The purposes of reducing cost, optimizing PCB space and reducing standby power consumption are achieved through the fan power supply control circuit.
Description
Technical Field
The utility model relates to an electronic circuit technical field, in particular to take fan power supply control circuit of auxiliary power source power supply and switch control signal PS _ ON function.
Background
In a conventional fan control circuit on the market, when a difference between a main output voltage and a fan voltage is large, the following 2 power supply modes are generally used for a conventional fan:
first, as shown in fig. 1, the fan is powered by an extra winding directly added from the main transformer through rectification, filtering and voltage stabilization circuits. The power supply has the advantages that the fan obtains power from the main transformer winding, when the power switch control signal PS _ ON is invalid, the main output is closed, the fan does not work, and the standby power consumption of the power supply is not influenced. However, a transformer fan power supply winding, a rectifying and filtering circuit and a voltage stabilizing circuit need to be additionally added, so that the number of devices is increased, the cost is increased, and the space of a PCB (printed circuit board) is enlarged.
Second, as shown in FIG. 2, the fan draws power directly from an auxiliary power source. The advantages are that no extra wiring is needed, the cost is low, and the PCB space is optimized. However, when the power switch control signal PS _ ON is invalid, the main output is turned off, the auxiliary source is normally output, and the fan is normally operated, so that the standby power consumption of the power supply is increased.
In recent years, with the rapid development of power supply technology, high power density power supply products are continuously miniaturized, and meanwhile, the requirements of relevant energy-saving and environment-friendly policies formulated by the state on the standby power consumption of the power supply are more and more strict, and the two fan power supply modes cannot well solve the problems of the standby power consumption of the power supply, the utilization of PCB space and the like.
In view of the complex circuit design and the high standby power consumption of the existing fan control mode, a fan power supply control circuit needs to be designed, and the minimum circuit and the minimum cost are used, so that the standby power consumption of the power supply is reduced, and the purposes of energy conservation and environmental protection are achieved.
SUMMERY OF THE UTILITY MODEL
In view of this, the to-be-solved technical problem of the utility model is to provide a can compromise the device cost, again can make full use of PCB space and reduce power stand-by power consumption fan supply circuit in taking the auxiliary power supply, in the power of switch control signal PS _ ON function, when main output voltage and fan voltage differed great.
In order to solve the above problems, the present invention provides a fan power supply control circuit, which is used to connect with an auxiliary source, a main control IC and a fan, wherein the auxiliary source is used to receive a power switch control signal PS _ ON inputted from the outside; the master control IC outputs a voltage control signal PVCC according to the power switch control signal PS _ ON;
the fan power supply control circuit includes: the circuit comprises a sampling circuit, a driving circuit and a switching circuit;
the sampling circuit converts the voltage control signal PVCC output from the master IC into a first voltage control signal;
the driving circuit receives the first voltage control signal and the voltage signal output by the auxiliary source, and outputs a second voltage control signal according to the first voltage control signal and the voltage signal output by the auxiliary source;
the switching circuit receives the second voltage control signal and the voltage signal output by the auxiliary source, and outputs a fan power supply voltage according to the second voltage control signal and the voltage signal output by the auxiliary source so as to control the on and off of the fan.
Preferably, the sampling circuit has a resistor R1, a resistor R2, and a filter capacitor C1;
one end of the resistor R1 is connected with a voltage control signal PVCC provided by the main control IC, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the filter capacitor C1 is connected with the resistor R2 in parallel.
Preferably, the driving circuit has a resistor R3 and a switching tube Q1;
one end of the resistor R3 is connected to the output port of the auxiliary source and is used for receiving the voltage signal output by the auxiliary source, the other end of the resistor R3 is connected to one end of the switch tube Q1, the other end of the switch tube Q1 is grounded, and the third end of the switch tube Q1 is connected to the connection node of the resistor R1 and the resistor R2.
Preferably, the switching circuit has a PMOS transistor Q2, and a capacitor C2;
one end of the PMOS tube is connected with the output port of the auxiliary source, the other end of the PMOS tube is connected with one end of the capacitor C2, the third end of the PMOS tube is connected with the connection node of the switch tube Q1 and the resistor R3, and the other end of the capacitor C2 is grounded.
Preferably, the voltage signal output by the auxiliary source is a high level signal.
Preferably, the switching tube Q1 is a triode or a MOS tube; when the switching transistor Q1 is an MOS transistor, the first terminal of the switching transistor Q1 is a drain, the second terminal is a source, and the third terminal is a gate.
The utility model also provides a fan power supply control circuit for be connected with auxiliary source, master control IC and fan, fan power supply control circuit receive by master control IC output voltage control signal PVCC with the voltage signal of auxiliary source output, and according to voltage control signal PVCC with a fan power supply voltage of voltage signal output of auxiliary source output extremely the fan to control opening and closing of fan.
Preferably, the voltage control signal PVCC provided by the main control IC is controlled by a power switch control signal PS _ ON received by the auxiliary source, and a high-low level state of the voltage control signal PVCC is determined according to a state of the power switch control signal PS _ ON.
The utility model also provides a fan power supply control circuit, fan power supply control circuit has: the resistor R1, the resistor R2, the resistor R3, the filter capacitor C1, the capacitor C2, the switching tube Q1 and the PMOS tube Q2;
one end of the resistor R1 is connected with a voltage control signal PVCC provided by the master control IC, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the filter capacitor C1 is connected with the resistor R2 in parallel;
one end of the resistor R3 is connected with a voltage signal output by the auxiliary source, the other end of the resistor R3 is connected with one end of the switch tube Q1, the other end of the switch tube Q1 is connected with the ground, and the third end of the switch tube Q1 is connected with a connection node of the resistor R1 and the resistor R2;
one end of the PMOS tube is connected with the voltage signal output by the auxiliary source, the other end of the PMOS tube is connected with one end of the capacitor C2, the third end of the PMOS tube is connected with the connection node of the switch tube Q1 and the resistor R3, and the other end of the capacitor C2 is grounded.
Preferably, the voltage control signal PVCC provided by the main control IC is controlled by a power switch control signal PS _ ON received by the auxiliary source, and a high-low level state of the voltage control signal PVCC is determined according to a state of the power switch control signal PS _ ON.
Compared with the prior art, the utility model discloses following beneficial effect has:
the fan power supply control circuit outputs a fan power supply voltage to the fan through a voltage control signal PVCC output by the main control IC and a voltage signal output by the auxiliary source so as to control the on and off of the fan. When the difference between the main output voltage and the fan voltage is large, even if the voltage signal output by the auxiliary source is always in a high level, the voltage control signal PVCC output by the main control IC can be controlled through the power switch control signal PS _ ON, so that the fan power supply voltage is controlled. When the power switch control signal PS _ ON is invalid, the voltage control signal PVCC is at a low level, the power supply voltage of the fan is also at a low level, and the fan does not work, so that the standby power consumption of the power supply is reduced, and the aims of optimizing the spatial layout of the PCB and saving energy and protecting environment by using the fewest circuits are fulfilled.
Drawings
FIG. 1 is a schematic block diagram of a prior art fan with additional windings powered from a main transformer when the fan voltage and the main output voltage are different;
FIG. 2 is a schematic diagram of a prior art fan powered directly from an auxiliary source when the fan voltage is similar to the auxiliary source voltage;
FIG. 3 is a schematic block diagram of a power supply control circuit of the fan of the present invention;
fig. 4 is a schematic diagram of an embodiment of the power supply control circuit of the fan of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to fig. 3 and 4. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Fig. 3 is a schematic block diagram of the power supply circuit of the fan power supply control circuit of the present invention.
The fan control circuit is used for being connected with an auxiliary source, a main control IC and a fan, an input signal (a voltage signal output by the auxiliary source) is high level, the fan control circuit controls the ON and off of a PMOS (P-channel metal oxide semiconductor) tube Q2 by detecting the high and low level states of a voltage control signal PVCC output by the main control IC so as to control the high and low level states of the power supply voltage of the fan, and the high and low level states of the voltage control signal PVCC output by the main control IC are controlled by a power switch control signal PS _ ON so as to achieve the following effects:
when the AC is electrified and the power switch control signal PS _ ON is invalid, the voltage signal output by the auxiliary source is at a high level, and the voltage control signal PVCC output by the main control IC is at a low level. At the moment, the first voltage control signal V4 is at a low level, the triode Q1 is turned off, the second voltage control signal V5 is at a high level, the PMOS pipe Q2 is not conducted, the power supply voltage of the fan is at a low level, the fan does not work, the standby power consumption of the power supply is not increased, and the energy-saving and environment-friendly effects are achieved.
When the power switch control signal PS _ ON is active, the voltage signal output by the auxiliary source is at a high level, the voltage control signal PVCC output by the main control IC is at a high level, the first voltage control signal V4 is at a high level at this time, the transistor Q1 is turned ON, the second voltage control signal V5 is at a low level, the PMOS transistor Q2 is turned ON, the fan supply voltage is at a high level, and the fan operates normally. Meanwhile, the loss of the PMOS tube Q2 is very small, and the PMOS tube Q2 can be packaged by a small patch, so that the purposes of saving the device cost and optimizing the PCB space are achieved.
Fig. 4 is a schematic diagram of a power supply control circuit of a power fan according to the present invention, wherein,
a resistor R1 and a resistor R2 of the sampling circuit are voltage division resistors, a capacitor C1 is a filter capacitor, one end of the resistor R1 is connected with a voltage control signal PVCC provided by the main control IC, the other end of the resistor R1 is connected with a resistor R2, the other end of the resistor R2 is grounded, the filter capacitor C1 is connected with the resistor R2 in parallel, a signal obtained by voltage division of the voltage control signal PVCC through the resistor R1 and the resistor R2 serves as a first voltage control signal V4, and the sampling circuit controls connection and disconnection of the switching tube Q1 according to the high-low level state of the voltage control signal PVCC.
A resistor R3 in the driving circuit is a pull-up resistor, a resistor Q1 is a switch tube, one end of a resistor R3 is connected with an output port of an auxiliary source and used for receiving a voltage signal output by the auxiliary source, the other end of the resistor R3 is connected with a switch tube Q1, a signal output by a switch tube Q1 is used as a second voltage control signal V5, one end of the switch tube Q1 is grounded, the third end of the switch tube Q1 is connected with a connection node of a resistor R1 and the resistor R2, the voltage signal output by the auxiliary source is always at a high level, and the driving circuit drives and controls the MOS tube Q2 to be switched on and off through the high-low level state of the second voltage control signal V5. When the switch Q1 is turned on, the second voltage control signal V5 is at a low level; when the switch Q1 is turned off, the second voltage control signal V5 is at a high level.
In the switching circuit, a switch tube Q2 is a PMOS tube, a capacitor C2 is a filter capacitor, the switching circuit controls the high-low level state of the fan voltage by switching off and switching on the PMOS tube Q2, when the PMOS tube Q2 is switched on, a voltage signal output by an auxiliary source charges a capacitor C2 through the PMOS tube Q2, the fan voltage is high level, and the fan normally works; when the PMOS transistor Q2 is turned off, the voltage signal output by the auxiliary source cannot charge the capacitor C2, the fan voltage is low, and the fan does not operate.
The above embodiments are only the preferred embodiments of the present invention, and it should be noted that the above preferred embodiments should not be considered as limitations of the present invention. The present invention can be further modified and modified as will be apparent from the prior art without departing from the spirit and scope of the present invention, and such modifications and modifications should be considered as the protection scope of the present invention, and will not be repeated herein.
Claims (10)
1. A power supply control circuit of a fan is used for being connected with an auxiliary source, a main control IC and the fan, and is characterized in that the auxiliary source is used for receiving a power switch control signal input from the outside; the master control IC outputs a voltage control signal according to the power switch control signal;
the fan power supply control circuit includes: the circuit comprises a sampling circuit, a driving circuit and a switching circuit;
the sampling circuit converts the voltage control signal output from the master IC into a first voltage control signal;
the driving circuit receives the first voltage control signal and the voltage signal output by the auxiliary source, and outputs a second voltage control signal according to the first voltage control signal and the voltage signal output by the auxiliary source;
the switching circuit receives the second voltage control signal and the voltage signal output by the auxiliary source, and outputs a fan power supply voltage according to the second voltage control signal and the voltage signal output by the auxiliary source so as to control the on and off of the fan.
2. The fan power control circuit of claim 1 wherein the sampling circuit has a resistor R1, a resistor R2, and a filter capacitor C1;
one end of the resistor R1 is connected with a voltage control signal provided by the master control IC, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the filter capacitor C1 is connected with the resistor R2 in parallel.
3. The fan power supply control circuit of claim 2 wherein the drive circuit has a resistor R3 and a switch Q1;
one end of the resistor R3 is connected to the output port of the auxiliary source and is used for receiving the voltage signal output by the auxiliary source, the other end of the resistor R3 is connected to one end of the switch tube Q1, the other end of the switch tube Q1 is grounded, and the third end of the switch tube Q1 is connected to the connection node of the resistor R1 and the resistor R2.
4. The fan power control circuit of claim 3 wherein the switching circuit has a PMOS transistor Q2, and a capacitor C2;
one end of the PMOS tube is connected with an output port of the auxiliary source, the other end of the PMOS tube is connected with one end of the capacitor C2, the third end of the PMOS tube is connected with a connection node of the switch tube Q1 and the resistor R3, and the other end of the capacitor C2 is grounded.
5. The fan power supply control circuit of claim 1, wherein the voltage signal output by the auxiliary source is a high level signal.
6. The fan power supply control circuit as claimed in claim 3, wherein the switching tube Q1 is a triode or a MOS transistor; when the switching transistor Q1 is an MOS transistor, the first terminal of the switching transistor Q1 is a drain, the second terminal is a source, and the third terminal is a gate.
7. A fan power supply control circuit is used for being connected with an auxiliary source, a main control IC and a fan, and is characterized in that the fan power supply control circuit receives a voltage control signal output by the main control IC and a voltage signal output by the auxiliary source, and outputs a fan power supply voltage to the fan according to the voltage control signal and the voltage signal so as to control the on and off of the fan.
8. The fan power control circuit of claim 7, wherein the voltage control signal provided by the main control IC is controlled by a power switch control signal received by the auxiliary source, and a high-low state of the voltage control signal is determined according to a state of the power switch control signal.
9. A fan power supply control circuit, comprising: the resistor R1, the resistor R2, the resistor R3, the filter capacitor C1, the capacitor C2, the switching tube Q1 and the PMOS tube Q2;
one end of the resistor R1 is connected with a voltage control signal provided by a master control IC, the other end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R2 is grounded, and the filter capacitor C1 is connected with the resistor R2 in parallel;
one end of the resistor R3 is connected with a voltage signal output by an auxiliary source, the other end of the resistor R3 is connected with one end of the switch tube Q1, the other end of the switch tube Q1 is connected with the ground, and the third end of the switch tube Q1 is connected with a connection node of the resistor R1 and the resistor R2;
one end of the PMOS tube is connected with a voltage signal output by an auxiliary source, the other end of the PMOS tube is connected with one end of the capacitor C2, the third end of the PMOS tube is connected with the connection node of the switch tube Q1 and the resistor R3, and the other end of the capacitor C2 is grounded.
10. The fan power control circuit of claim 9, wherein the voltage control signal provided by the main control IC is controlled by a power switch control signal received by the auxiliary source, and a high-low state of the voltage control signal is determined according to a state of the power switch control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123421537.XU CN217233862U (en) | 2021-12-31 | 2021-12-31 | Power supply control circuit for fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123421537.XU CN217233862U (en) | 2021-12-31 | 2021-12-31 | Power supply control circuit for fan |
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| Publication Number | Publication Date |
|---|---|
| CN217233862U true CN217233862U (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123421537.XU Active CN217233862U (en) | 2021-12-31 | 2021-12-31 | Power supply control circuit for fan |
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|---|---|
| CN (1) | CN217233862U (en) |
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2021
- 2021-12-31 CN CN202123421537.XU patent/CN217233862U/en active Active
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