Fan time-sharing control circuit

Abstract

The utility model provides a time-sharing control circuit for a fan. The time-sharing control circuit comprises a control signal generating circuit A, a signal conditioning circuit B and a signal feedback circuit C, the control signal generating circuit A receives and processes control signals of the controller, the processed signals are sent to the fans, the signals sent by the fans are converted into electric signals through the signal conditioning circuit B, and then the electric signals are fed back to the controller through the signal feedback circuit C. In this way, closed-loop control is achieved, and effective control over the rotating speed and faults of the fans can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of circuit, more specifically to a kind of fan time-sharing control circuit. BACKGROUND

[0002] For three-phase alternating current electrical appliance, stable work is the symbol of product quality, therefore, heat dissipation becomes the most important, for the control of three or less fan, it is relatively easy to realize, but for the time-sharing control of multiple fans, each manufacturer is not the same.If it cannot be accurately controlled, the consequences will be very serious, various chips will bear different levels of temperature rise, which is likely to cause equipment damage.Therefore, it is very necessary to design a fan time-sharing control circuit, when fan operation fails, the circuit will form a signal into the controller, and inform the user of the current fan failure on host computer, and will issue an alarm, which can avoid equipment downtime due to overheating problem and even serious damage to devices, so that users can find the cause of failure more quickly. SUMMARY

[0003] The utility model discloses a kind of fan time-sharing control circuit, can be monitored to the fan failure signal of high-power rectification and frequency conversion by the circuit, and obtains a pulsating direct current voltage after processing, when multiple fan operation is normal, the signal sent by controller through hardware circuit, adjust fan speed, simultaneously detect the running state of multiple fan, when certain fan failure, the signal sent by controller through hardware circuit, detect the change of fan running state, its output signal is shown as the change of feedback signal, can quickly diagnose fan failure problem by the change of feedback signal, the circuit has simple and practical, reliable and effective function.

[0004] The utility model discloses a kind of fan time-sharing control circuit, including control signal generating circuit A, signal conditioning circuit B, signal feedback circuit C.Control signal generating circuit A receives controller control signal and handles, the signal after processing is sent to each fan, fan sends signal through signal conditioning circuit B to convert signal into electric signal, then through signal feedback circuit C feedback to controller, so as to realize closed-loop control, can realize the effective control of fan speed and failure.

[0005] Provide a kind of fan time-sharing control circuit, including control signal generating circuit A, signal conditioning circuit B, signal feedback circuit C.Control signal generating circuit A receives controller control signal and handles, the signal after processing is sent to each fan, fan sends signal through signal conditioning circuit B to convert signal into electric signal, then through signal feedback circuit C feedback to controller, so as to realize closed-loop control, can realize the effective control of fan speed and failure.

[0006] Preferably, the control signal generating circuit A includes a controller, an optocoupler, and a fan system; the controller provides a signal C1, which is sent to the LED input pin 1 of the optocoupler through a resistor R1 for current limiting; the primary side of the optocoupler is connected in parallel with a resistor R2, and the resistor R2 is connected in parallel across the LED to form a current shunt and voltage stabilizing effect.

[0007] The light coupling input end is an internal LED, and the input circuit is controlled by a controller signal C1; when the C1 signal is valid, the LED is turned on to emit a light signal to excite the internal photosensitive transistor of the light coupling, thereby generating a signal at the output end of the light coupling; the pin 3 of the light coupling is grounded GND, and the pin 4 of the light coupling is connected to a +5V power supply through a resistor R3; the pin 4 and the pin 5 of the light coupling are connected to a subsequent signal converter circuit; the output signal of the light coupling is transmitted to the signal converter, and the signal converter controls the fan system according to the received light coupling signal; the output of the signal converter controls the running state of the fan A, the fan B and the fan C through a signal line C11.

[0008] Preferably, the fan system conditioning circuit is connected; the state signal of the fan system is processed by the signal conditioning circuit B, and a control signal C21 is output; the signal C21 is transmitted to the EN pin of the gating controller U2 to start or stop the gating controller U2.

[0009] Preferably, the signal feedback circuit C includes a fault signal input end out1, an operational amplifier U3, a light coupling U4 and a receiving end;

[0010] The fault signal enters the circuit from the input end out1, and is connected to the positive input end +IN of the operational amplifier U3 through a filter circuit composed of a resistor R6 and a capacitor C1;

[0011] The pin 3 of the positive input end of the operational amplifier U3 is connected to the input signal out1, and the pin 2 of the negative input end is grounded or connected to a reference voltage; the pin 1 of the output end of the operational amplifier U3 is connected to a subsequent signal processing part for transmitting the compared signal; the power supply pin 5 of the operational amplifier U3 is connected to +5V, and the decoupling capacitor C2 is connected to the ground to ensure stable power supply;

[0012] The signal output by the operational amplifier U3 is adjusted by the signal processing part, and then sent to the light coupling U4 through the current limiting resistors R8 and R9;

[0013] The LED end pin 1 and the pin 2 of the light coupling U4 receive the signals processed by the signal processing part, and the current is limited by the resistors R8 and R9 to protect the LED; when the internal LED of the light coupling U4 is turned on, the output end pin 3 of the internal photosensitive transistor generates a signal connected to the COM end; the signal output by the light coupling U3 is transmitted to the external receiving end through the COM end of the pin 3 to realize signal isolation and transmission.

[0014] Preferably, the coupling uses a model TLP185GB or TLP2309.

[0015] Preferably, the strobe controller U2 employs 74HC4051D. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the control signal generating circuit principle diagram of the utility model;

[0017] Figure 2 is the signal conditioning circuit principle diagram of the utility model;

[0018] Figure 3 is the signal feedback circuit principle diagram of the utility model. DETAILED DESCRIPTION

[0019] The utility model will be further described below in combination with examples and drawings.

[0020] Referring to Figure 1 : the control signal generating circuit A has demonstrated a circuit connection based on photo-coupler (TLP2309), and the following is the connection relationship and function description of each part thereof:

[0021] Controller part: the module marked as "controller" in the upper left of the drawing outputs a control signal "signal C1"; the signal enters the input end (1 pin) of photo-coupler TLP2309 through resistor R1; R2 resistor is connected to the other end (2 pin) of the photo-coupler and grounded with COM.

[0022] Photo-coupler TLP2309: the photo-coupler is used for signal isolation, and the input side receives the signal from the controller, and the output side controls the subsequent circuit; the 1 and 2 pins of TLP2309 are input ends, and the 5, 4 and 3 pins are output ends.

[0023] When the input signal C1 activates the photo-coupler, the LED inside the photo-coupler emits light, activates the photo-transistor, and makes the circuit at the output end conductive.

[0024] Output part: the output end of TLP2309 is connected to +5V power supply through resistor R3; this part controls a "signal converter", which is used for subsequent control of the operation of the fan; the conductive signal output by the photo-coupler is transmitted to the fan A, fan B and fan C through the "signal converter".

[0025] Power supply part: +5V power supply is provided to the output side of the photo-coupler and the signal converter, and GND is grounded, so as to ensure the normal work of the circuit.

[0026] The function of the circuit is to isolate the signal C1 output by the controller from the subsequent "signal converter" and fan control through the optical coupling TLP2309; the control signal C1 sent by the controller is connected to R1, R1 is connected to R2, and the two ends of R2 are connected to the primary side of the optical coupling TLP2309, one end of which is connected to COM, and the secondary side is connected to +5V power supply and R3 resistor respectively, and 3 of the secondary side is connected to GND, while 4 is connected to the signal converter respectively, and after processing by the signal converter, control signals C11 are generated and sent to signal conditioning circuit B and each fan for fan control and other auxiliary control; the optical coupling ensures electrical isolation of the control signal and the drive circuit, enhances the anti-interference ability of the system, and can control the start and stop of multiple fans through the signal converter.

[0027] Referring to Figure 2 : The connection relationship of a gate control controller (74HC4051D) in the signal conditioning circuit B is shown, and the functions of the fan system, signal processing and fault signal output are shown. The following is the textual description of the circuit:

[0028] Circuit connection:

[0029] Fan system (fan A, fan B, fan C): The three fans (fan A, fan B, fan C) are connected to the conditioning circuit to generate feedback signals.

[0030] These feedback signals are sent to the conditioning circuit for processing, and output signal C21 is output.

[0031] Conditioning circuit: The conditioning circuit processes signal C21 and outputs it through the feedback signal of the fan system.

[0032] Signal C21 is connected to the EN port (enable end) of the 74HC4051D gate control controller through resistor R5, which controls the working state of the gate control controller.

[0033] 74HC4051D gate control controller (U2): This chip is an 8-input single-channel analog gate control controller.

[0034] The input ends In1 to In6 are respectively connected to different signal sources. Specifically, In4, In5 and In6 are respectively connected to external feedback signals through switches.

[0035] A0, A1 and A2 are address selection ports, which determine the input signal path of the gate control controller.

[0036] The Out output port is the final selected signal output path.

[0037] The enable end EN controls whether the gate control controller works, which is controlled by signal C21.

[0038] Fault signal: The fault signal is output through Out1, indicating the working state or abnormal condition of the fan system.

[0039] Power connection: The 16th pin of the gate controller is connected to the +5V power supply, providing working voltage.

[0040] The 8th and 7th pins are connected to ground (GND), ensuring normal grounding of the circuit.

[0041] Functions of each part:

[0042] Fan system: Detects the state of the fan and processes the feedback signal through the conditioning circuit.

[0043] Conditioning circuit: Processes the feedback signal of the fan system and outputs it to the gate controller, controlling its operation.

[0044] Gate controller 74HC4051D: Selects different input signals and outputs the fault signal through the Out port for system state monitoring.

[0045] Resistor R5: Provides appropriate voltage distribution to ensure that the gate controller can correctly receive control signals.

[0046] C11 and fan signals are connected to the conditioning circuit, which outputs a processed signal C21 through R5 pull-up to +5V. U2 processes the signals IN1~IN6 received from the fan and generates an OUT1 signal (which can be considered as a fault signal when a fault occurs). Signal C21 is connected to the input of the signal feedback circuit C. The function of the entire circuit is to monitor the state of the fan through the feedback signal of the fan system and output the fault signal through the gate controller to show whether the fan has failed or is working abnormally.

[0047] Figure 3 A signal feedback circuit is shown, which mainly functions to feedback and process the fault signal through the comparator and transmit the processed signal to the receiving end through the optocoupler. The following is a description of the connection relationship of the circuit and the functions of each part:

[0048] Circuit connection:

[0049] Fault signal input (out1):

[0050] Out1 as an input signal enters the circuit for processing.

[0051] Resistors and filter capacitors (R6, C1, C2):

[0052] The resistor R6 and the capacitor C1 form a filter circuit for the input signal, removing noise and stabilizing the input signal.

[0053] The capacitor C2 is a power decoupling capacitor, used to filter the power supply fluctuations and ensure the stable operating voltage of the operational amplifier (U3).

[0054] Operational amplifier LMV331 (U3):

[0055] The role of the operational amplifier is to compare the input signal. Its +IN pin is connected to the fault signal, and the -IN pin is grounded or connected to the reference voltage.

[0056] When the input signal exceeds a certain threshold, the output (OUT) of the operational amplifier produces a corresponding high or low level signal, which is used for subsequent signal processing.

[0057] The power supply of this operational amplifier is +5V, providing a stable operating voltage.

[0058] Signal processing part:

[0059] The signal output by the operational amplifier enters the subsequent signal processing part, which may perform level conversion or further conditioning.

[0060] Optocoupler TLP185GB (U4):

[0061] After processing, the signal is transmitted to the LED end (pins 1 and 2) of the optocoupler through resistors R8 and R9. R8 and R9 are responsible for current limiting and protecting the LED of the optocoupler.

[0062] When the LED inside the optocoupler is turned on, the internal phototransistor generates a signal at pin 3, which is sent to the receiving end through the COM terminal.

[0063] The role of the optocoupler is to isolate the electrical signal in the circuit, preventing noise or interference from directly affecting the receiving end device.

[0064] Receiving end:

[0065] The processed feedback signal is transmitted to the receiving end through the optocoupler, which may be used for further monitoring or fault handling.

[0066] Functions of each part:

[0067] Input filter circuit: filter the input signal through R6 and C1, eliminate high-frequency noise, and ensure signal stability.

[0068] Operational amplifier LMV331: compare the input fault signal, when the signal reaches the set threshold, output high and low level signal, play the role of detection fault signal.

[0069] Signal processing circuit: adjust the signal output by the operational amplifier, so as to adapt to the subsequent optocoupler drive.

[0070] Optocoupler TLP185GB: realize the isolation and transmission of electrical signal, ensure the stability and safety of signal transmission.

[0071] The receiving end: receive the processed feedback signal, for system monitoring and fault handling.

[0072] In signal feedback circuit C, OUT1 connects the signal to the 1 pin of U3, the 2 pin of U3 is connected to GND, the 3 pin is connected to R6 and R7 respectively, the other end of R6 and R7 is connected to +5V and GND respectively, the 5 pin of U3 is connected to +5V, and C2 is also connected to +5V, the other end of C2 is connected to GND. The 4 pin of U3 is connected to the signal processing circuit, and the output after processing is connected to R9, R9 and R8 are connected, R8 is connected to +5V, and the two ends of R9 are connected to the primary side 1, 2 pin of U4, and the 3, 4 pin is fed back to the receiving end of the controller.

[0073] In this embodiment, the type of optocoupler is TLP185GB and TLP2309, the type of comparator is LMV331ILT, and the type of gating controller is 74HC4051D.

Claims

1. A fan time sharing control circuit, characterized by comprising: It comprises control signal generating circuit A, signal conditioning circuit B and signal feedback circuit C; the control signal generating circuit A receives controller control signal and processes, wherein the processed signal is sent to each fan, the signal from the fan is converted into electric signal by the signal conditioning circuit B, and is fed back to the controller by the signal feedback circuit C.

2. The fan time sharing control circuit of claim 1, wherein: The control signal generating circuit A comprises controller, optocoupler and fan system; wherein the controller provides signal C1, which is sent to the LED input pin 1 of the optocoupler through current limiting resistor R1; the primary side of the optocoupler is connected in parallel with resistor R2, wherein R2 is connected in parallel across the LED, forming the function of current shunt and voltage stabilization; The input end of the optocoupler is internal LED, and the input circuit is controlled by controller signal C1; when C1 signal is valid, the LED is turned on, emitting light signal, exciting the internal photosensitive transistor of the optocoupler, so as to generate signal at the output end of the optocoupler; the pin 3 of the optocoupler is grounded GND, and the pin 4 of the optocoupler is connected to +5V power supply through resistor R3; the pin 4 and pin 5 of the optocoupler are connected to the subsequent signal converter circuit; the output signal of the optocoupler is transmitted to the signal converter, and the signal converter controls the fan system according to the received optocoupling signal; the output of the signal converter controls the running state of the fan A, fan B and fan C through signal line C11.

3. The fan split-time control circuit according to claim 2, wherein: The fan system conditioning circuit is connected; the state signal of the fan system is processed by the signal conditioning circuit B and outputs control signal C21; the signal C21 is transmitted to the EN pin of the gating controller U2; to start and stop the gating controller U2.

4. The fan split-phase control circuit of claim 1, wherein: The signal feedback circuit C comprises fault signal input end out1, operational amplifier U3, optocoupler U4 and receiving end; Wherein the fault signal enters the circuit from the input end out1, and is connected to the positive input end +IN of the operational amplifier U3 through the filter circuit composed of resistor R6 and capacitor C1; The pin 3 of the positive input end of the operational amplifier U3 is connected to the input signal out1, and the negative input end pin 2 is grounded or connected to reference voltage; wherein the output end pin 1 of the operational amplifier U3 is connected to the subsequent signal processing part for transmitting the compared signal; the power supply pin 5 of the operational amplifier U3 is connected to +5V, and the power supply decoupling capacitor C2 is connected to the ground, ensuring stable power supply; The signal output by the operational amplifier U3 is adjusted by the signal processing part, and then sent to the optocoupler U4 through current limiting resistors R8 and R9; The LED end pin 1 and pin 2 of the optocoupler U4 receive the signal processed, and the current is limited through resistors R8 and R9 to protect the LED; when the internal LED of the optocoupler U4 is turned on, the output end pin 3 of the internal photosensitive transistor generates a signal connected to the COM end; the signal output by the optocoupler U3 is transmitted to the external receiving end through the COM end of pin 3, realizing signal isolation and transmission.

5. The fan split-phase control circuit of claim 2, wherein: The optocoupler adopts model TLP185GB or TLP2309.

6. The fan split-phase control circuit of claim 3, wherein: The gating controller U2 adopts 74HC4051D.

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