CN216554546U - Parallel control device for multiple direct current fans - Google Patents
Parallel control device for multiple direct current fans Download PDFInfo
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- CN216554546U CN216554546U CN202121423119.1U CN202121423119U CN216554546U CN 216554546 U CN216554546 U CN 216554546U CN 202121423119 U CN202121423119 U CN 202121423119U CN 216554546 U CN216554546 U CN 216554546U
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Abstract
The utility model discloses a parallel control device for a plurality of direct current fans, which belongs to the technical field of fans and comprises a fan speed regulation control unit, a plurality of fan current detection units and a fan interface unit, wherein the fan speed regulation control unit and the fan current detection units are connected with the fan interface unit, thereby solving the technical problem of parallel driving of the plurality of fans, improving the compatibility of circuits, reducing the application cost, completing the quick control and accurate detection of fans only by fan rotating speed signals and fan current detection signals, having simple control and detection circuits and easy product structure design, realizing rotating speed regulation and fault detection for a single fan by only utilizing two power input lines, solving the problems of complicated wiring, limited radiator structure design, poor multi-wire-bundle waterproof performance and the like caused by more fan control wires in practical application, the control mode of the direct current fan is simplified.
Description
Technical Field
The utility model belongs to the technical field of fans, and relates to a control device for parallel connection of multiple direct current fans.
Background
In various industrial standards, requirements on the volume and the protection level of power electronic products are higher and higher, such as photovoltaic inverters, charging piles, energy storage inverters and the like. Among these products, the semiconductor switching device generates a large amount of heat, and usually requires a fan to perform forced air cooling heat dissipation, and a direct current fan is widely used due to low noise and convenience in driving.
In the prior art, in order to reduce the product volume, a forced air cooling scheme for controlling a plurality of small-size fans in parallel is generally selected, at present, four-wire control is adopted for direct-current fans, one direct-current fan is a rotating speed adjusting circuit except two direct-current power supply circuits and is connected with a central control chip, and the central control chip controls and outputs a PWM signal to realize the adjustment of the rotating speed of the fans; the other is a rotating speed feedback circuit which is connected with a central control chip, the central control chip judges whether the fan fails or not by detecting signals output by the fan rotating speed feedback circuit, when the signals have constant high or low levels, the fan failure is judged, meanwhile, the failure is reported, and the output of the power supply is stopped so as to protect the fan. The scheme of the parallel connection of the multiple fans realizes the reduction of the product volume and brings the following defects:
1. a speed regulating circuit and a Hall detection circuit are required in each fan, and the cost of each fan is increased.
2. The parallel use of a plurality of fans increases the number of control lines: for 4-wire fans, 12 wires are needed for three fans, so that the area of PCB layout is increased, and the wiring in the product is redundant and not beneficial to the optimization of product layout.
3. The design of the radiator is not facilitated: in practical application, the fan needs to be connected with the internal module through the radiator through holes, the more through holes of the wire harness are needed, and the more through holes are needed, so that the space requirement and the layout difficulty in product structural design are increased.
4. The waterproof treatment of the wire harness is more demanding: the wire harness is connected with the internal module through a through hole of the radiator, and the fan wire harness and the through hole are required to be subjected to waterproof treatment, and a heat-shrinkable sleeve is generally used for wrapping and a silicon rubber dispensing scheme is generally adopted; however, the fan wire harnesses are independent wire harnesses, which is not beneficial to the coverage of silicon rubber, and the more the wire harnesses are, the poorer the waterproof performance is.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a parallel control device for multiple direct current fans, which solves the technical problem of parallel driving of multiple fans.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a control device for parallel connection of a plurality of direct current fans comprises a fan speed regulation control unit, a plurality of fan current detection units and a fan interface unit, wherein the fan speed regulation control unit and the fan current detection units are connected with the fan interface unit;
the fan interface unit comprises a plurality of fan positive interfaces and a plurality of fan negative interfaces;
the fan speed regulation control unit comprises a driving signal interface, a driving circuit and a BUCK circuit, wherein the driving signal interface is connected with the driving circuit, the driving circuit is connected with the BUCK circuit, and the BUCK circuit is connected with all fan positive electrode interfaces;
the fan current detection unit comprises a detection circuit, a plurality of current sampling circuits and a voltage division circuit, wherein the detection circuit comprises a plurality of operational amplifiers, the in-phase end of each operational amplifier is respectively connected with one current sampling circuit, and each current sampling circuit is respectively connected with one fan cathode interface;
the inverting end of each operational amplifier is connected with a voltage division circuit;
the output end of each operational amplifier respectively outputs a current sampling signal of the fan.
Preferably, in the fan interface unit, each positive fan interface corresponds to one negative fan interface, and the positive fan interface and the corresponding negative fan interface are connected to a power supply terminal of one fan.
Preferably, the driving circuit comprises an NMOS tube, the G pole of the NMOS tube is connected to the external duty cycle signal, the D pole drives the BUCK circuit, and the S pole is connected to the ground.
Preferably, the BUCK circuit is composed of a PMOS switch tube and a peripheral circuit thereof, and a D pole of the NMOS tube drives a D pole of the PMOS switch tube.
Preferably, the driving signal interface is used for connecting the external duty cycle signal provided by an external control chip.
Preferably, the current sampling circuit is composed of a current sampling resistor, and a current signal output by the fan cathode interface is input to the non-inverting terminal of the operational amplifier through the current sampling resistor.
Preferably, the voltage dividing circuit is composed of two voltage dividing resistors, the voltage dividing circuit is connected to a positive power supply, and the voltage dividing circuit provides a comparison voltage for an inverting terminal of the operational amplifier.
Preferably, the positive power supply is provided by an external power supply module.
Preferably, the output end of the operational amplifier is connected with an IO port of the external control chip.
The utility model has the beneficial effects that:
the utility model relates to a parallel control device for a plurality of direct current fans, which solves the technical problem of parallel driving of the plurality of fans, improves the compatibility of a circuit, reduces the application cost, can complete quick control and accurate detection of a fan only by a fan rotating speed signal and a fan current detection signal, has simple control and detection circuit, is easy for product structure design, can realize rotating speed regulation and fault detection on a single fan by only using two power supply input lines, solves the problems of complex wiring, radiator structure design limitation, poor multi-wiring-bundle waterproof property and the like caused by more fan control wiring bundles in practical application, simplifies the control mode of the direct current fans, only needs to connect the fan into the power supply wiring bundles, is suitable for the application of the direct current fans of various wiring systems, has strong compatibility, and is easy to understand the implementation method and the principle of the utility model, the circuit is reliable to realize, simple and easy to realize, the direct current fan model selection scheme can be optimized, and the fan model selection cost is reduced; the processing difficulty of multi-wire harness wiring in batch production can be reduced in manufacturing and production, and the production cost is reduced.
Drawings
FIG. 1 is a block diagram of a circuit diagram of the present invention;
FIG. 2 is a schematic block diagram of the present embodiment;
fig. 3 is a circuit diagram of the present embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The device for controlling the parallel connection of the plurality of direct current fans as shown in fig. 1 to fig. 3 comprises a fan speed regulation control unit, a plurality of fan current detection units and a fan interface unit, wherein the fan speed regulation control unit and the fan current detection units are connected with the fan interface unit;
the fan interface unit comprises a plurality of fan positive interfaces and a plurality of fan negative interfaces;
the fan speed regulation control unit comprises a driving signal interface, a driving circuit and a BUCK circuit, wherein the driving signal interface is connected with the driving circuit, the driving circuit is connected with the BUCK circuit, and the BUCK circuit is connected with all fan positive electrode interfaces;
the fan current detection unit comprises a detection circuit, a plurality of current sampling circuits and a voltage division circuit, wherein the detection circuit comprises a plurality of operational amplifiers, the in-phase end of each operational amplifier is respectively connected with one current sampling circuit, and each current sampling circuit is respectively connected with one fan cathode interface;
the inverting end of each operational amplifier is connected with a voltage division circuit;
the output end of each operational amplifier respectively outputs a current sampling signal of the fan.
Preferably, in the fan interface unit, each positive fan interface corresponds to one negative fan interface, and the positive fan interface and the corresponding negative fan interface are connected to a power supply terminal of one fan.
Preferably, the driving circuit comprises an NMOS tube, the G pole of the NMOS tube is connected to the external duty cycle signal, the D pole drives the BUCK circuit, and the S pole is connected to the ground.
Preferably, the BUCK circuit is composed of a PMOS switch tube and a peripheral circuit thereof, and a D pole of the NMOS tube drives a D pole of the PMOS switch tube.
Preferably, the driving signal interface is used for connecting the external duty cycle signal provided by an external control chip.
Preferably, the current sampling circuit is composed of a current sampling resistor, and a current signal output by the fan cathode interface is input to the non-inverting terminal of the operational amplifier through the current sampling resistor.
Preferably, the voltage dividing circuit is composed of two voltage dividing resistors, the voltage dividing circuit is connected to a positive power supply, and the voltage dividing circuit provides a comparison voltage for an inverting terminal of the operational amplifier.
Preferably, the positive power supply is provided by an external power supply module.
Preferably, the output end of the operational amplifier is connected with an IO port of the external control chip.
Fig. 3 shows an embodiment of the present invention for controlling 3 fans:
FAN +1, FAN +2 and FAN +3 are respectively FAN positive interfaces of 3 FANs, and FAN-1, FAN-2 and FAN-3 are respectively FAN negative interfaces of 3 FANs;
FAN _ EN is a duty ratio signal; VCC is a positive power supply; FAN _ F1, FAN _ F2, and FAN _ F3 are signals input to an external control chip.
In fig. 3, the driving circuit is composed of an NMOS transistor Q2 and resistors R1 and R3, and directly drives the gate of the PMOS switching transistor Q1, but in the present embodiment, a basic BUCK circuit is adopted, and the basic BUCK circuit is composed of a PMOS transistor Q1, an inductor L1, a diode D1, and an electrolytic capacitor C1.
The output voltage of the basic BUCK circuit is a voltage FAN + controlled by the duty cycle signal FAN _ EN, and FAN + is connected to FAN +1, FAN +2, and FAN + 3. The external control chip changes the duty ratio signal FAN _ EN according to the heat dissipation requirement, so that the FAN + voltage can be adjusted, and the purpose of controlling the rotating speed of the FAN is achieved. The circuit of the utility model is easy to drive and control and has strong loading capacity.
Setting power supply ends of the FAN 1 to comprise FAN +1 and FAN-1; the power supply ends of the FAN 2 comprise FAN +2 and FAN-2; the power supply ends of the FAN 3 comprise FAN +3 and FAN-3;
the fan current detection unit mainly comprises an operational amplifier IC1, an operational amplifier CI2 and an operational amplifier IC 3. The power supply negative terminals FAN-1, FAN-2 and FAN-3 of the FAN are current detection terminals, and the current detection is returned to the module internal power supply terminal GND through the current sampling resistor R4, the resistor R5 and the resistor R6. Taking the operation of the operational amplifier IC1 as an example, the current detection signal FAN-1 enters the inverting terminal of the operational amplifier IC1 through the resistor R7, the inverting terminal of the operational amplifier IC1 is connected with one end of the resistor R12, the other end of the resistor R12 is connected with the ground, one end of the resistor R9 is connected with the positive power supply, the other end of the resistor R9 is connected with the inverting terminal of the operational amplifier IC1, the resistor R12 and the resistor R9 form a voltage divider circuit, and the voltage divider circuit provides a comparison voltage for the inverting terminal of the operational amplifier IC1, so that the uncertainty of the output signal of the operational amplifier IC1 is prevented when the inverting terminal and the inverting terminal are both at 0 level in the standby state of the FAN, and the accuracy of current sampling is improved.
The operational amplifier IC1 outputs a signal of a current detection signal FAN _ F1 of the FAN 1, the signal is sent to the control chip and used for judging the working state of the FAN, when the signal has a low level for a long time or a high level for a long time, the FAN is judged to have a fault in operation, the central control chip can report the fault and control the FAN power supply FAN + to be closed, and the FAN is protected. The working principle of other parallel fans is the same as that of the fan 1:
the fan current detection unit corresponding to the fan 2 comprises an operational amplifier IC2, a resistor R11, a resistor R10 and a resistor R5, the resistor R10 is a current sampling resistor corresponding to the fan 2, and the inverting end of the operational amplifier IC2 is connected with a voltage division circuit;
the fan current detection unit corresponding to the fan 3 comprises an operational amplifier IC3, a resistor R14, a resistor R13 and a resistor R6, the resistor R13 is a current sampling resistor corresponding to the fan 2, and the inverting end of the operational amplifier IC3 is connected with a voltage division circuit.
The FAN interface unit consists of a power supply positive terminal FAN + and a power supply negative terminal FAN-of the FAN, and mainly has the function of connecting the interior of the module with a FAN port.
The utility model has the beneficial effects that:
the utility model relates to a parallel control device for a plurality of direct current fans, which solves the technical problem of parallel driving of the plurality of fans, improves the compatibility of a circuit, reduces the application cost, can complete quick control and accurate detection of a fan only by a fan rotating speed signal and a fan current detection signal, has simple control and detection circuit, is easy for product structure design, can realize rotating speed regulation and fault detection on a single fan by only using two power supply input lines, solves the problems of complex wiring, radiator structure design limitation, poor multi-wiring-bundle waterproof property and the like caused by more fan control wiring bundles in practical application, simplifies the control mode of the direct current fans, only needs to connect the fan into the power supply wiring bundles, is suitable for the application of the direct current fans of various wiring systems, has strong compatibility, and is easy to understand the implementation method and the principle of the utility model, the circuit is reliable to realize, simple and easy to realize, the direct current fan model selection scheme can be optimized, and the fan model selection cost is reduced; the processing difficulty of multi-wire harness wiring in batch production can be reduced in manufacturing and production, and the production cost is reduced.
Any process or method descriptions herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing custom logical functions or steps of a process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps described in this specification, for example, as an ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (ePROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: discrete logic circuits with logic gates for implementing logic functions on data blocks, application specific integrated circuits with appropriate combinational logic gates, Programmable Gate Arrays (PGAs), Field Programmable Gate Arrays (FPGAs), etc.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. The utility model provides a many direct current fan parallel control device which characterized in that: the system comprises a fan speed regulation control unit, a plurality of fan current detection units and a fan interface unit, wherein the fan speed regulation control unit and the fan current detection units are connected with the fan interface unit;
the fan interface unit comprises a plurality of fan positive interfaces and a plurality of fan negative interfaces;
the fan speed regulation control unit comprises a driving signal interface, a driving circuit and a BUCK circuit, wherein the driving signal interface is connected with the driving circuit, the driving circuit is connected with the BUCK circuit, and the BUCK circuit is connected with all fan positive electrode interfaces;
the fan current detection unit comprises a detection circuit, a plurality of current sampling circuits and a voltage division circuit, wherein the detection circuit comprises a plurality of operational amplifiers, the in-phase end of each operational amplifier is respectively connected with one current sampling circuit, and each current sampling circuit is respectively connected with one fan cathode interface;
the inverting end of each operational amplifier is connected with a voltage division circuit;
the output end of each operational amplifier respectively outputs a current sampling signal of the fan.
2. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 1, wherein: in the fan interface unit, each positive fan interface corresponds to one negative fan interface, and the positive fan interface and the negative fan interface corresponding to the positive fan interface are connected with the power supply end of one fan.
3. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 1, wherein: the drive circuit comprises an NMOS tube, the G pole of the NMOS tube is connected with an external duty ratio signal, the D pole drives the BUCK circuit, and the S pole is connected with a ground wire.
4. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 3, wherein: the BUCK circuit is composed of a PMOS switch tube and a peripheral circuit thereof, and the D pole of the NMOS tube drives the D pole of the PMOS switch tube.
5. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 3, wherein: the driving signal interface is used for connecting the external duty ratio signal provided by an external control chip.
6. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 1, wherein: the current sampling circuit is composed of a current sampling resistor, and a current signal output by the negative electrode interface of the fan is input to the in-phase end of the operational amplifier through the current sampling resistor.
7. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 6, wherein: the voltage division circuit is composed of two voltage division resistors, the voltage division circuit is connected with a positive power supply, and the voltage division circuit provides a comparison voltage for the inverting terminal of the operational amplifier.
8. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 7, wherein: the positive power is provided by an external power module.
9. The device for controlling the parallel connection of the plurality of direct current fans as claimed in claim 5, wherein: and the output end of the operational amplifier is connected with one IO port of the external control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121423119.1U CN216554546U (en) | 2021-06-25 | 2021-06-25 | Parallel control device for multiple direct current fans |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121423119.1U CN216554546U (en) | 2021-06-25 | 2021-06-25 | Parallel control device for multiple direct current fans |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216554546U true CN216554546U (en) | 2022-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121423119.1U Active CN216554546U (en) | 2021-06-25 | 2021-06-25 | Parallel control device for multiple direct current fans |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216554546U (en) |
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2021
- 2021-06-25 CN CN202121423119.1U patent/CN216554546U/en active Active
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