CN100526654C - Fan system and sequential starting module and delayed starting unit thereof - Google Patents

Abstract

A fan system receives an external input voltage, and the fan system includes a first fan module, a second fan module, and a sequential start module. The sequential start module is electrically connected to the first fan module and the second fan module, receives the input voltage, and starts the first fan module according to the input voltage, and after a predetermined time after the first fan module is started, starts the second fan module according to the input voltage.

Description

Fan system and its sequential start module and delayed start unit

technical field

The invention relates to a fan system and its sequence start module and delay start unit, in particular to a fan system with multiple fan modules and its sequence start module and delay start unit.

Background technique

Generally speaking, large-scale electronic systems are equipped with fan systems to ensure that the electronic system maintains a normal operating temperature so that the electronic system can operate normally.

FIG. 1 shows a schematic diagram of a conventional fan system 1 arranged in an electronic system (not shown in the figure). The fan system 1 receives an external input voltage V _in as a working voltage. The fan system 1 basically has a starting module 11 and a plurality of fan modules 12a to 12n. Wherein, when the starting module 11 receives the input voltage V _in , it will start the fan modules 12a to 12n at the same time to dissipate heat. However, when these fan modules 12a to 12n start at the same time, a very large start-up current and inrush current will be generated at the moment of start-up, which may cause the electronic system or the fan system to stop working or other unpredictable Wrong action, what's more, may cause damage to the electronic system or fan system 1.

As shown in FIG. 2 , in another conventional fan system 1', a plurality of start-up modules 11a-11n are respectively corresponding to these fan modules 12a-12n, so as to respectively start these fan modules 12a-12n.

In view of the above problems, the prior art uses an analog start-up control chip to make these fan modules 12a to 12n start up sequentially, or uses a software module to control these fan modules 12a to 12n to start up sequentially, and starts up these fan modules 12a to 12n at different times As a protection mechanism, these fan modules 12a to 12n are activated simultaneously to avoid malfunctions. However, the analog startup control chip is expensive, and the design structure of the software module is complex, so the overall production cost of the existing fan system 1 is too high. In addition, the analog startup control chip can only delay the startup time of the fan modules 12a to 12n, but cannot achieve the effect of soft-start.

Therefore, the present invention provides a fan system and its sequential start module and delayed start unit to improve the above problems.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a fan system and its sequential start module and delay start unit, which can start multiple fan modules at different time points to achieve the effect of sequential start, so as to avoid errors caused by these fan modules starting at the same time. action.

In view of the above problems, another object of the present invention is to provide a fan system and its sequence start module and delay start unit, which also has a reset effect, and can discharge the remaining charge in the fan system to avoid malfunction produce.

Therefore, to achieve the above purpose, a fan system of the present invention receives an external input voltage, and the fan system includes a first fan module, a second fan module and a sequence start module. Wherein, the sequential starting module is electrically connected to the first fan module and the second fan module respectively,

The input voltage is received, and the first fan module is started according to the input voltage, and after a predetermined time elapses after the first fan module is started, the second fan module is started according to the input voltage.

In order to achieve the above object, a sequential starting module according to the present invention receives an external input voltage, cooperates with the first fan module and the second fan module, and includes a starting unit and a delayed starting unit. Wherein, the starting unit is electrically connected with the first fan module, receives the input voltage, and starts the first fan module according to the input voltage; the delayed starting unit is electrically connected with the starting unit and the second fan module respectively, receives the input voltage, and After the first fan module is started, after a predetermined time, the second fan module is started according to the input voltage.

To achieve the above purpose, a delay start unit according to the present invention receives an external input voltage, cooperates with a fan module, and includes a start circuit and a delay circuit. Wherein, the starting circuit has a first switching element and a second switching element, one end of the first switching element receives an input voltage to start the fan module, and the second switching element is electrically connected to the first switching element to control the first switching element; The circuit is electrically connected to the first switch element and the second switch element respectively, receives an input voltage, and controls the first switch element and the second switch element after a predetermined time elapses to start the fan module.

In order to achieve the above object, according to a reset method of a delay circuit of the present invention, the delay circuit is connected to an external input voltage, and has a capacitor and a switch element, the switch element receives the input voltage and is electrically connected to the capacitor, and the switch element is grounded, reset The method includes the steps of: separating the delay circuit from the input voltage; turning on the switching element; and forming a discharge path through the switching element for the capacitor to discharge.

To sum up, according to a fan system of the present invention, its sequential start module and delayed start unit start multiple fan modules at different time points to achieve the effect of sequential start, so as to prevent these fan modules from generating very large noise at the moment of start-up. Start-up current and inrush current cause malfunctions. Start these fan modules separately to ensure the normal operation of the fan system and avoid damage to the electronic system and fan system. It can also replace the analog start-up control chip to reduce the overall production cost. In addition, the present invention also has the effect of resetting, which can discharge the remaining charge in the fan system to avoid malfunction.

Description of drawings

Fig. 1 shows a schematic diagram of an existing fan system;

Fig. 2 shows the schematic diagram of another kind of existing fan system;

Figure 3 shows a schematic diagram of a fan system of a preferred embodiment of the present invention; and

Fig. 4 shows a circuit diagram of a fan system according to a preferred embodiment of the present invention.

Description of component symbols:

1. 1’-fan system 11. 11a～11n-starting module

12a～12n-fan module V _in -input voltage

2-Fan system 21-First fan module

22-Second fan module 23-Sequence start module

231-start unit 232-delay start unit

233-start circuit 234-delay circuit

D ₁ ~ D ₉ - Diodes C ₁ ~ C ₅ - Capacitors

R ₁ -R ₁₄ -resistors Q ₁ -first switching element

Q ₂ - second switching element Q ₃ - third switching element

Q ₄ - fourth switching element Q ₅ - fifth switching element

Q ₆ -sixth switching element Q ₇ , Q ₈ -switching element

U ₁ - comparator output - output terminal

input ₁ - first input input ₂ - second input

91-Input voltage V _CC -External power supply

V ₁ - control signal V _ref - reference signal

B-base E-emitter

C-Collector G-Gate

S-source D-drain

Detailed ways

A fan system according to a preferred embodiment of the present invention and its sequential start-up module and delayed start-up unit will be described below with reference to relevant figures.

FIG. 3 is a schematic diagram of a fan system according to a preferred embodiment of the present invention. The fan system 2 can be applied to an electronic system (not shown in the figure) for heat dissipation. The fan system 2 receives an external input voltage 91 as a working voltage, and the input voltage 91 can be provided by the electronic system. The fan system 2 includes a first fan module 21 , a second fan module 22 and a sequence starting module 23 . The first fan module 21 and the second fan module 22 respectively have fans. Of course, the user can configure multiple fans at the first fan module 21 and the second fan module 22 respectively according to heat dissipation requirements, so as to enhance the heat dissipation effect.

The sequence start module 23 includes a start unit 231 and a delay start unit 232 . Wherein, the starting unit 231 is electrically connected with the first fan module 21 , receives the input voltage 91 , and starts the first fan module 21 according to the input voltage 91 . The delay start unit 232 includes a start circuit 233 and a delay circuit 234 . The start-up circuit 233 is electrically connected between the second fan module 22 and the delay circuit 234, and receives the input voltage 91. The delay circuit 234 controls the start-up circuit 233 according to the input voltage 91 after the first fan module 21 is started and after a predetermined time elapses. Used to start the second fan module 22 .

The fan system 2 of this embodiment restarts the second fan module 22 after a predetermined period of time after the first fan module 21 is started, so as to achieve the effect of starting the first fan module 21 and the second fan module 22 in different time sequences to prevent When the first fan module 21 and the second fan module 22 are started at the same time, a very large starting current and surge current are generated to cause malfunction.

In addition, FIG. 4 is a schematic circuit diagram of the fan system of the preferred embodiment of the present invention. The delay start unit 232 includes a start circuit 233 and a delay circuit 234 . Wherein, the startup circuit 233 has a plurality of diodes D ₁ -D ₄ , a plurality of resistors R ₁ -R ₂ , a first switching element Q ₁ , a second switching element Q ₂ , and a plurality of capacitors C ₁ , C ₅ . The second switching element Q ₂ is electrically connected to the first switching element Q ₁ through a diode D ₃ to control the first switching element Q ₁ . In addition, the delay circuit 234 is electrically connected to the first switching element Q ₁ and the second switching element Q ₂ respectively.

The first switching element _Q1 and the second switching element _Q2 can be transistors or other electronic elements with switching effects. In this embodiment, the first switching element _Q1 is a PMOS transistor, and the second switching element _Q2 is an NMOS transistor. . In addition, the diodes D ₁ and D ₂ are connected in parallel, and their first ends receive the input voltage 91 , and the diodes D ₁ and D ₂ in this embodiment can be Schottky diodes for preventing reverse current. One end of the resistor R ₁ is electrically connected to the second ends of these diodes D ₁ , D ₂ .

The source S of the first switching element Q ₁ is electrically connected to the second ends of these diodes D ₁ , D ₂ to receive an input voltage 91 . The drain D of the first switch element Q ₁ is electrically connected to the second fan module 22 to start the second fan module 22 . The drain D of the second switching element _Q2 is electrically connected to the second ends of these diodes _D1 , _D2 and the gate G of the first switching element _Q1 , and the gate G of the second switching element _Q2 is electrically connected to the delay circuit 234. connect.

A first end of the diode _D3 is electrically connected to the drain D of the second switching element _Q2 , and a second end is electrically connected to the gate G of the first switching element _Q1 . A first end of the diode _D4 is electrically connected to the source S of the first switching element _Q1 , and a second end is electrically connected to a second end of the diode _D3 . The first end of the capacitor _C1 is electrically connected to the source S of the first switching element _Q1 , the first end of the resistor _R2 is electrically connected to the second end of the capacitor _C1 , and the second end of the resistor _R2 is grounded.

The delay circuit 234 includes a third switch element Q ₃ , a fourth switch element Q ₄ , a fifth switch element Q ₅ , a sixth switch element Q ₆ , a comparator U ₁ , a plurality of resistors R ₃ ˜R ₈ , R ₁₂ ˜ R ₁₄ , at least capacitor C ₂ and at least diode D ₅ . The third switching element Q ₃ , the fourth switching element Q ₄ , the fifth switching element Q ₅ and the sixth switching element Q ₆ may be transistors or other electronic components with switching effects. In this embodiment, the third switching element Q _3. The fifth switching element _Q5 and the sixth switching element _Q6 are NPN transistors, and the fourth switching element _Q4 is a PNP transistor.

The base B of the third switching element _Q3 is electrically connected to the first end of the resistor _R3 to receive the input voltage 91, the collector C of the third switching element _Q3 is connected to these diodes _D1 , D through the resistor _{R5 2} , the emitter E of the third switching element _Q3 and the resistor _R4 are grounded.

The base B of the fourth switching element _Q4 is electrically connected to the collector C of the third switching element _Q3 , and the emitter E of the fourth switching element _Q4 is connected to the external power supply V _CC .

The resistor _R6 has a first end and a second end, and the first end is electrically connected to the collector C of the fourth switching element _Q4 .

The capacitor _C2 has a first end and a second end, the first end is electrically connected to the second end of the resistor _R6 through the diode _D5 , and the second end of the capacitor _C2 is grounded. In addition, when the fourth switching element Q ₄ is turned on, the capacitor C ₂ starts to charge, and the control signal V ₁ is generated at the first terminal of the capacitor C ₂ .

The comparator _U1 has a first input terminal input ₁ , a second input terminal input ₂ and an output terminal output. In this embodiment, the first input terminal input ₁ is a non-inverting input terminal, and the second input terminal input ₂ is an inverting input terminal. input. Wherein, the first input terminal input ₁ is electrically connected to the second terminal of the resistor R ₆ , the second input terminal input ₂ is electrically connected to the resistors R ₇ and R ₈ , and these resistors R ₇ and R ₈ form a voltage divider circuit , and provide a reference signal V _ref to the second input terminal input ₂ , and the output terminal output is electrically connected to the gate G of the second switching element Q ₂ through the resistor R ₉ to control the second switching element Q ₂ .

The collector C of the fifth switching element _Q5 is electrically connected to the first end of the capacitor _C2 , and the emitter E of the fifth switching element _Q5 is grounded. The collector C of the sixth switching element _Q6 is electrically connected to the base B of the fifth switching element _Q5 , the base B of the sixth switching element _Q6 is electrically connected to the input voltage 91, and the emitter of the sixth switching element _Q6 E ground.

The first end of the resistor R ₁₂ receives the input voltage 91, the second end of the resistor R ₁₂ is electrically connected to the first end of the resistor R ₁₃ , the second end of the resistor R ₁₃ is grounded, and the two form a voltage divider circuit, And the base B of the sixth switching element _Q6 is electrically connected to the second end of the resistor _R12 for receiving the divided input voltage. A first end of the resistor R ₁₄ is electrically connected to the collector C of the sixth switching element Q ₆ , and a second end of the resistor R ₁₄ is electrically connected to the starting unit 231 .

The starting unit 231 mainly includes a plurality of diodes D ₆ ˜D ₉ , a plurality of resistors R ₁₀ ˜R ₁₁ , two switching elements Q ₇ , Q ₈ and a plurality of capacitors C ₃ , C ₄ . Among them, diodes D ₆ ~ D ₉ , resistors R ₁₀ ~ R ₁₁ , switching elements Q ₇ , Q ₈ , capacitor C ₃ , and the above-mentioned diodes D ₁ ~ D ₄ , resistors R ₁ ~ R ₂ , switching element Q ₁ , Q ₂ and capacitor C ₁ have the same composition and function, which will not be repeated here. In addition, the capacitor _C4 is electrically connected to the base B of the fifth switching element _Q5 , and is electrically connected to the collector C of the sixth switching element _Q6 .

The operation principle of the fan system 2 is as follows: First, after the sequential starting module 23 receives the input voltage 91 at the first time, the starting unit 231 and the delayed starting unit 232 simultaneously receive the input voltage 91 as the working voltage.

The diodes D ₆ and D ₇ of the start-up unit 231 receive the input voltage 91, so that the switching element Q ₈ is turned on, and the capacitor C ₃ begins to charge until when the voltage value of the capacitor C ₃ reaches the starting voltage of the switching element Q ₇ , the switching element When Q ₇ is turned on, the first fan module 21 can start to operate. In this embodiment, through the charging circuit of the capacitor _C3 and the resistor _R11 , the current flowing through the first fan module 21 increases at a relatively slow rate, so as to achieve the effect of soft start.

While the delay circuit 234 receives the input voltage 91, the third switching element _Q3 and the fourth switching element _Q4 are turned on, and the capacitor _C2 starts to charge to generate the control signal _V1 . After a predetermined time, the voltage value of the control signal _V1 is greater than Referring to the voltage value of the signal V _ref , the output terminal output outputs a positive voltage value to the gate of the second switching element Q ₂ to control the second switching element Q ₂ of the start-up circuit 233 to turn on. It should be noted that the predetermined time is determined according to the charging time of the capacitor _C2 and the resistor _R6 . The user can select different capacitors _C2 and resistor _R6 according to the required delay time to adjust the predetermined time. time, or when the resistor _R6 is a variable resistor, the preset time can be adjusted by adjusting the resistance value of the resistor _R6 .

When the second switching element _Q2 is turned on, the capacitor _C1 starts charging until the voltage value of the capacitor _C1 reaches the starting voltage of the first switching element _Q1 , the first switching element _Q1 is turned on, and the second The second fan module 22 starts to operate, and achieves the effect of soft start.

In addition, the fan system 2 of this embodiment also has a reset effect, and the action principle of the reset method is as follows: when the sequence start module 23 receives the input voltage 91, the switching elements Q ₇ and Q ₈ are turned on, and through the resistors R ₁₂ , The voltage division of _R13 turns on the sixth switching element _Q6 of the delay circuit 234, and starts to charge the capacitor _C4 . At this time, the potential of the base B of the fifth switching element _Q5 is about zero, that is, it is in a non-conductive state. And when the user pulls the fan system 2 away from the electronic system (that is, stops sending the input voltage 91), at this time, the capacitor _C4 starts to discharge, and a voltage drop is generated at the resistor _R14 as the turn-on voltage, so that the first The fifth switch element _Q5 is turned on, and at this time, the capacitor _C2 can form a discharge path through the fifth switch element _Q5 to release the charge stored in the capacitor _C2 to achieve the reset effect, which can prevent the next time the user will turn the fan system 2 When plugged back into the electronic system, malfunction occurs. It can be seen from this that the fan system 2 of this embodiment starts the first fan module 21 and the second fan module 22 at different times through the sequential starting module 23 to achieve the effect of sequential starting and has the effect of resetting. In addition, although in FIG. 4 Only two fan modules are shown, but it is not limited thereto, and multiple fan modules can be configured according to user requirements.

To sum up, according to a fan system of the present invention, its sequential start module and delayed start unit start multiple fan modules at different time points to achieve the effect of sequential start, so as to prevent these fan modules from generating very large noise at the moment of start-up. Start-up current and inrush current cause malfunctions. These fan modules are started in time-sharing to ensure the normal operation of the fan system and avoid damage to the electronic system and fan system. It can also replace the analog start-up control chip to reduce the overall production cost. In addition, the present invention has a reset effect, which can discharge the residual electric charge in the fan system, so as to avoid malfunctions.

The above description is only exemplary, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the scope of the appended patent application.

Claims (18)

1. A fan system, which receives an external input voltage, comprising: a first fan module; the second fan module; The sequential start module includes a start unit and a delay start unit, wherein the start unit is electrically connected to the first fan module, receives the input voltage, starts the first fan module according to the input voltage, and delays start A unit, which is electrically connected to the second fan module, receives the input voltage, and starts the second fan module according to the input voltage after a predetermined time elapses after the first fan module is started. 2. The fan system of claim 1, wherein the delayed start unit comprises: A start-up circuit, which has a first switch element and a second switch element, the first switch element receives the input voltage, the second switch element is electrically connected to the first switch element to control the first switch an element activates the second fan module; and a delay circuit, electrically connected to the first switch element and the second switch element respectively, which receives the input voltage, and controls the first a switching element and the second switching element to activate the second fan module. 3. The fan system of claim 2, wherein the start-up circuit further has at least one diode having a first end receiving the input voltage and a second end electrically connected to the first switching element. 4. The fan system according to claim 3, wherein the first switching element and the second switching element are respectively transistors. 5. The fan system according to claim 4, wherein the source of the first switching element is electrically connected to the second end of the diode, and the drain of the first switching element is electrically connected to the second end of the diode. The fan module is electrically connected, the drain of the second switching element is electrically connected to the second end of the diode and the gate of the first switching element, and the gate of the second switching element is connected to the delay The circuit is electrically connected. 6. The fan system of claim 5, wherein the first switching element is a PMOS transistor and the second switching element is an NMOS transistor. 7. The fan system of claim 2, wherein the delay circuit comprises: a third switching element, one end of which receives the input voltage; a fourth switching element electrically connected to the third switching element; a first resistor having a first end and a second end, the first end being electrically connected to the fourth switching element; a capacitor having a first end and a second end, the first end is electrically connected to the second end of the first resistor, and the second end of the capacitor is grounded, when the fourth When the switch element is turned on, the first end generates a control signal; and A comparator, which has a first input terminal, a second input terminal and an output terminal, the first input terminal receives the control signal, the second input terminal receives a reference signal, the output terminal is connected to the second switch The element is electrically connected to control the second switching element. 8. The fan system according to claim 7, wherein the delay circuit further comprises a fifth switching element and a sixth switching element, the fifth switching element is electrically connected to the first end of the capacitor, the The sixth switching element is electrically connected to the fifth switching element. 9. The fan system of claim 8, wherein the delay circuit further comprises: a second resistor having a first end and a second end, the first end receiving the input voltage; a third resistor having a first end and a second end, the first end is electrically connected to the second end of the second resistor, and the second end is grounded; and The fourth resistor has a first end and a second end, the first end is electrically connected to the sixth switch element, and the second end is electrically connected to the starting unit. 10. The fan system according to claim 8, wherein the third switching element, the fourth switching element, the fifth switching element and the sixth switching element are respectively transistors, and the first The fifth switching element and the sixth switching element are respectively electrically connected to the starting unit. 11. The fan system according to claim 10, wherein the starting unit has another capacitor electrically connected to the fifth switching element. 12. The fan system according to claim 7, wherein the predetermined time depends on a charging time of the first resistor and the capacitor. 13. The fan system according to claim 7, wherein the first input terminal is a non-inverting input terminal, and the second input terminal is an inverting input terminal. 14. The fan system of claim 7, wherein the first resistor is a variable resistor. 15. The fan system of claim 1, wherein the first fan module and the second fan module each have at least one fan. 16. A reset method applying the delay circuit of the fan system according to claim 1, the delay circuit is connected to an external input voltage and has a capacitor and a switching element, and the switching element receives the input voltage and communicates with the The capacitor is electrically connected, and the switching element is grounded, and the reset method includes the following steps: separating the delay circuit from the input voltage; turning on the switching element; and The capacitor forms a discharge path through the switching element to discharge. 17. The reset method according to claim 16, wherein the switch element is turned on by a turn-on voltage provided by another capacitor. 18. The reset method according to claim 17, wherein the switching element is a transistor, and the base of the switching element receives the input voltage and is electrically connected to the other capacitor, the switching element The collector is electrically connected to the capacitor, and the emitter of the switching element is grounded.

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