CN208203634U - New temperature control circuit for power supply fan - Google Patents

Abstract

The utility model relates to a novel temperature control circuit of a power supply fan, wherein a temperature sensing control module is connected with a fan CON3, and an OP power detection module is respectively connected with a power supply control unit, a high temperature sensing delay module and a temperature sensing control module; the first switch tube is electrically connected between the current transformer OP and the temperature sensing control module, and a voltage node for driving the first switch tube to be conducted is connected between the current transformer OP and the first switch tube; the high-temperature induction delay module comprises a thermistor TH 4; therefore, the fan can be started only when the system power exceeds a certain value, energy is saved, the practicability is high, and when the system suddenly drops to a certain value in a high-power running state, if the temperature is too high, the fan cannot be stopped like in the traditional technology, the fan can be controlled to continuously rotate to dissipate heat through the high-temperature induction delay module in a delayed mode, the service life of a power supply is prolonged, and the safety and reliability of the system are improved.

Description

New temperature control circuit for power supply fan

technical field

The utility model relates to the field of a power supply fan, in particular to a novel temperature control circuit for a power supply fan.

Background technique

A fan is installed inside the system host to dissipate heat from the system through forced air cooling. In the existing fan drive control circuit, after pressing the power button PS/ON, the fan will start directly, which is not conducive to energy saving and environmental protection; after the fan is started, the speed of the fan will also change with the temperature change; the system runs at high power When the status suddenly drops to a certain value, because the fan will stop immediately, the residual heat in the chassis cannot be dissipated in time, shortening the service life of the power supply and reducing the safety and reliability of the system.

Therefore, in the utility model patent application, the applicant carefully studied a new temperature control circuit for a power supply fan to solve the above problems.

Utility model content

The utility model aims at the shortcomings of the above-mentioned prior art, and its main purpose is to provide a new type of temperature control circuit for a power supply fan, which realizes that the fan can only be started if the system power exceeds a certain value, saves energy, and has strong practicability. When the power operation state suddenly drops to a certain value, if the temperature is too high, it will not stop the fan like in the traditional technology, it can delay the control of the fan to continue to rotate and dissipate heat through the high temperature sensing delay module, prolong the service life of the power supply and improve the system performance. safety and reliability.

In order to achieve the above-mentioned purpose, the utility model takes the following technical solutions:

A new temperature control circuit for a power supply fan, which is connected to the fan CON3, including a temperature sensing control module, a power control unit, a first power supply, a second power supply, an OP power detection module, and a high temperature sensing delay module; the power control unit Connect the first power supply and the second power supply respectively; the temperature sensing control module is connected to the fan CON3, the first power supply is respectively connected to the temperature sensing control module and the fan CON3, the second power supply is connected to the fan CON3, and the OP power detection module is respectively connected to the power control unit, a high temperature sensing delay module, and a temperature sensing control module; the OP power detection module includes a current transformer OP and a first switch tube, the first switch tube is electrically connected between the current transformer OP and the temperature sensing control module, and the current mutual inductor A voltage node for driving the first switch tube to conduct is connected between the device OP and the first switch tube; the high temperature sensing delay module includes a thermistor TH4 for controlling the voltage value of the above voltage node.

As a preferred solution, the power control unit has a transformer, and the transformers are respectively electrically connected to the first power supply and the second power supply; the current transformer OP has an inductor and a primary coil set on the inductor, a secondary coil The secondary coil, the inductive input end of the primary coil is connected in series with the transformer; one end of the inductive output of the secondary coil is connected to the anode of the diode D16, and the other end is grounded.

As a preferred solution, the OP power detection module also includes a diode D16, a resistor R84, a resistor R47, a resistor R83, a resistor R143 and a second switch tube, the output end of the current transformer OP is connected to the anode of the diode D16, and the diode D16 The cathode of the resistor R84 is connected to one end of the resistor R84, and the other end of the resistor R84 is connected to the control end of the first switch tube and one end of the resistor R47 at the same time, the other end of the resistor R47 and the output end of the first switch tube are grounded, and the input of the first switch tube One end of the resistor R83, one end of the resistor R143 and the control end of the second switch tube are connected at the same time, the other end of the resistor R83 is connected to the output end of the first power supply, and the other end of the resistor R143 and the output end of the second switch tube are both grounded , the input end of the second switch tube is connected to the temperature sensing control module.

As a preferred solution, the control end of the second switch tube is grounded through the switch button SW1.

As a preferred solution, the first switching tube is an NPN transistor Q32, the base of the NPN transistor Q32 is the control terminal of the first switching tube, and the collector of the NPN transistor Q32 is the input terminal of the first switching tube. The emitter of the type transistor Q32 is the output terminal of the first switch tube.

As a preferred solution, the second switch tube is an N-type MOS tube Q31, the gate of the N-type MOS tube Q31 is the control terminal of the second switch tube, and the drain of the N-type MOS tube Q31 is the input terminal of the second switch tube , the source of the N-type MOS transistor Q31 is the output terminal of the second switch transistor.

As a preferred solution, the high temperature sensing delay module further includes a capacitor C34 and a capacitor C31, one end of the thermistor TH4 is connected to one end of the capacitor C34 and the cathode of the diode D16 at the same time, and the other end of the thermistor TH4 is connected to the capacitor C31 at the same time. One end and the control end of the second switching tube, the other end of the capacitor C34 and the other end of the capacitor C31 are all grounded; the thermistor TH4 is connected in parallel with the resistor R84, and the thermistor TH4 is a negative temperature coefficient thermistor.

As a preferred solution, the temperature sensing control module includes a thermistor TH2, a polar capacitor C74, a third switching tube, a fourth switching tube, a fifth switching tube, a resistor R73, a resistor R82, a resistor 64, a resistor R65, The diode D12 and the capacitor C45, the aforementioned first power supply are simultaneously connected to one end of the thermistor TH2, one end of the resistor 64 and the input end of the fifth switching tube, and the other end of the thermistor TH2 is simultaneously connected to the control terminal of the third switching tube, The positive pole of the polarity capacitor C74 is connected to the input terminal of the first switching tube, the control terminal of the third switching tube is grounded through the resistor R73, and the other end of the resistor 64 is simultaneously connected to the control terminal of the fifth switching tube and the input terminal of the third switching tube, The output terminal of the third switching tube is grounded through the resistor R82, the output terminal of the fifth switching tube is connected to one end of the fan CON3, the other end of the fan CON3 is connected to the input terminal of the fourth switching tube, and the control terminal of the fourth switching tube is connected to the third switch The control end of the tube, the output end of the fourth switching tube is grounded, the aforementioned second power supply is connected to the anode of the diode D12, the anode of the diode D12 is connected to one end of the resistor R65, and the other end of the resistor R65 is simultaneously connected to the output end of the fifth switching tube, One end of the capacitor C45, the negative pole of the capacitor C45 is grounded.

As a preferred solution, the third switch tube is an NPN transistor Q33, the base of the NPN transistor Q33 is the control terminal of the third switch tube, and the collector of the NPN transistor Q33 is the input terminal of the third switch tube. The emitter of the type triode Q33 is the output end of the third switch tube; the fourth switch tube is an N-type MOS tube Q34, the gate of the N-type MOS tube Q34 is the control terminal of the four switch tubes, and the drain of the N-type MOS tube Q34 is The input terminal of the fourth switch tube, the source of the N-type MOS transistor Q34 is the output terminal of the fourth switch tube; the fifth switch tube is an NPN transistor Q16, and the base of the NPN transistor Q16 is the control terminal of the fifth switch tube , the collector of the NPN transistor Q16 is the input terminal of the fifth switch tube, and the emitter of the NPN transistor Q16 is the output terminal of the fifth switch tube.

Compared with the prior art, the utility model has obvious advantages and beneficial effects, specifically: through the OP power detection module, the fan can only be started if the system power exceeds a certain value, saving energy, and has strong practicability; moreover, through the high temperature Induction delay module, when the system suddenly drops to a certain value in the high-power operation state, if the temperature is too high, it will not stop the fan like in the traditional technology, it can control the fan to continue to rotate and dissipate heat through the high-temperature induction delay module delay, extending the The service life of the power supply and improve the safety and reliability of the system.

In order to more clearly illustrate the structural features and functions of the present invention, it will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the rough control structure schematic diagram of the embodiment of the utility model;

Fig. 2 is the circuit schematic diagram of the embodiment of the utility model;

FIG. 3 is a block diagram of the overall circuit connection of the chassis power supply and the fan according to the embodiment of the present invention.

Explanation of reference numbers:

10. Temperature sensing control module 20. First power supply

30. Second power supply 40. OP power detection module

50. High temperature induction delay module 60. Power control unit

1. New temperature control circuit for power supply fan 2. Transformer

CON3, fan.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 3, a new temperature control circuit 1 for a power fan includes a temperature sensing control module 10, a power control unit 60, a first power supply 20, a second power supply 30, an OP power detection module 40 and a high temperature The sensing delay module 50; the power control unit 60 is respectively connected to the first power supply 20 and the second power supply 30; the temperature sensing control module 10 is connected to the fan CON3, and the first power supply 20 is respectively connected to the temperature sensing control module 10 and the fan CON3, The second power supply 30 is connected to the fan CON3, and the OP power detection module 40 is respectively connected to the power control unit 60, the high temperature sensing delay module 50, and the temperature sensing control module 10; wherein:

The OP power detection module 40 includes a current transformer OP, a diode D16, a resistor R84, a resistor R47, a resistor R83, a resistor R143, a first switch tube and a second switch tube, and the first switch tube is electrically connected to the current transformer OP and Between the temperature sensing control modules 50, a voltage node for driving the first switch tube is connected between the current transformer OP and the first switch tube; the output end of the current transformer OP is connected to the anode of the diode D16, and the cathode of the diode D16 Connect one end of the resistor R84, the other end of the resistor R84 is connected to the control end of the second switch tube and one end of the resistor R47 at the same time, the other end of the resistor R47 and the output end of the second switch tube are both grounded, and the input end of the second switch tube is simultaneously Connect one end of the resistor R83, one end of the resistor R143, and the control end of the first switch tube, the other end of the resistor R83 is connected to the output end of the first power supply 20, the other end of the resistor R143 and the output end of the first switch tube are grounded, The input end of the first switching tube is connected to the temperature sensing control module 10; after the power button PS/ON is pressed, the OP power detection module 40 can drive the fan to start when the system power exceeds 20% load, so as to achieve the effect of energy saving and environmental protection. , when the system is running at low power, the system noise can be effectively reduced; it should be noted that it is not limited to 20%, and the corresponding set value can be increased or decreased according to needs. After pressing the power button PS/ON, if the load has been kept low (also can be understood as below the set value), usually the temperature in the chassis will not be too high, so the resistance of the following thermistor TH4 will be In a relatively large state, the resistance value of the thermistor TH4 connected in parallel with the resistor R84 is relatively large, and the voltage value of the voltage node is relatively small, which cannot drive the first switch tube to conduct, and the fan will not be started.

In this embodiment, the control terminal of the first switch tube is grounded through the switch button SW1. In a newly installed power fan, the switch button SW1 needs to be pressed to detect whether the fan is operating normally; when the switch button SW1 is pressed, the P power Both the detection module 40 and the high temperature sensing delay module 50 are short-circuited and cannot operate normally.

The first switching tube is an NPN transistor Q32, the base of the NPN transistor Q32 is the control terminal of the first switching tube, the collector of the NPN transistor Q32 is the input terminal of the first switching tube, and the emitter of the NPN transistor Q32 is The output terminal of the first switching tube; preferably, the second switching tube is an N-type MOS transistor Q31, the gate of the N-type MOS transistor Q31 is the control terminal of the second switching tube, and the drain of the N-type MOS transistor Q31 is the second The input end of the switch tube and the source of the N-type MOS transistor Q31 are the output end of the second switch tube; preferably.

The power control unit 60 has a transformer 2, and the transformer 2 is electrically connected to the first power supply and the second power supply respectively; the current transformer OP has an inductance and a primary coil and a secondary coil sleeved on the inductance, The inductive input end of the primary coil is connected in series with the transformer 2; one end of the inductive output of the secondary coil is connected to the anode of the diode D16, and the other end is grounded; in this embodiment, the voltage control unit also has a power cord plug Interface, EMI module, bridge rectifier module, first PFC inductor module, second PFC inductor module, high voltage diode rectifier module, high voltage capacitor filter module, rectifier module, energy storage inductor module, capacitor inductor filter module, DC-DC Converter; the power source line plug interface is connected to the EMI module, the EMI module is connected to the bridge rectifier module, the bridge rectifier module is connected to the first PFC inductance module, and the first PFC inductance module is connected to the second PFC inductance module , the second PFC inductance module is connected to a high-voltage diode rectifier module, the high-voltage diode rectifier module is connected to a high-voltage capacitor filter module, the high-voltage capacitor filter module is connected to a transformer 2, and the transformer 2 is connected to a rectifier module, the The rectifier module is connected to the energy storage inductance module, the energy storage inductance module is respectively connected to the capacitor inductance filter module and the DC-DC converter, the capacitor inductance filter module is connected to the first power supply 20, and the first power supply is +12V, The DC-DC converter is connected to a second power supply 30, and the second power supply is +5V;

The high temperature sensing delay module 50 includes a capacitor C34, a capacitor C31, and a thermistor TH4 for controlling the voltage value of the aforementioned voltage node. In this embodiment, the thermistor TH4 is a negative temperature coefficient thermistor to detect Temperature changes; one end of the thermistor TH4 is connected to one end of the capacitor C34 and the cathode of the diode D16 at the same time, the other end of the thermistor TH4 is connected to one end of the capacitor C31 and the control end of the first switch tube, and the other end of the capacitor C34 and the other end of the capacitor C31 are grounded; the thermistor TH4 is connected in parallel with the resistor R84. In this embodiment, when the power supply has been used for a period of time, the internal temperature is too high. At this time, the load suddenly drops below a certain set percentage value, for example, below 20% load (it should be noted that it is not limited to 20%, you can increase or decrease the corresponding setting value according to the needs), due to the high temperature, the resistance value of the thermistor TH4 becomes smaller, then, the resistance value of the thermistor TH4 and resistor R84 in parallel decreases, and the voltage node The voltage value can be large enough to drive the first switch tube to be turned on, and then the fan CON3 will be controlled to continue to rotate for heat dissipation, which solves the problem in the traditional technology that the fan cannot continue to dissipate heat because the load suddenly drops to a certain set value and the fan stops running. The problem that the power supply causes adverse effects.

The temperature sensing control module 10 includes a thermistor TH2, a polar capacitor C74, a third switch tube, a fourth switch tube, a fifth switch tube, a resistor R73, a resistor R82, a resistor 64, a resistor R65, a diode D12 and a capacitor C45 , in this embodiment, the thermistor TH2 is also a negative temperature coefficient thermistor to detect temperature changes; the aforementioned first power supply 20 is simultaneously connected to one end of the thermistor TH2, one end of the resistor 64 and the second The input terminal of the fifth switching tube and the other end of the thermistor TH2 are simultaneously connected to the control terminal of the third switching tube, the positive pole of the polarity capacitor C74 and the input terminal of the first switching tube, and the control terminal of the third switching tube is grounded through the resistor R73 , the other end of the resistor 64 is connected to the control terminal of the fifth switch tube and the input terminal of the third switch tube at the same time, the output end of the third switch tube is grounded through the resistor R82, the output end of the fifth switch tube is connected to one end of the fan CON3, and the fan The other end of CON3 is connected to the input terminal of the fourth switching tube, the control terminal of the fourth switching tube is connected to the control terminal of the third switching tube, the output terminal of the fourth switching tube is grounded, and the aforementioned second power supply 30 is connected to the anode of the diode D12, The anode of the diode D12 is connected to one end of the resistor R65, and the other end of the resistor R65 is connected to the output end of the fifth switching tube, one end of the capacitor C45, and the negative pole of the capacitor C45; it should be noted that with the increase of the system power, the temperature When the sensing control module 10 detects that the internal temperature rises, it will drive and increase the rotation speed of the fan CON3 to ensure effective heat dissipation of the system.

Preferably, the third switch transistor is an NPN transistor Q33, the base of the NPN transistor Q33 is the control terminal of the third switch transistor, the collector of the NPN transistor Q33 is the input terminal of the third switch transistor, and the NPN transistor Q33 The emitter pole of the third switching tube is the output end of the third switching tube; preferably, the fourth switching tube is an N-type MOS transistor Q34, the gate of the N-type MOS transistor Q34 is the control terminal of the four switching tubes, and the drain of the N-type MOS transistor Q34 is The input end of the fourth switch tube, the source of the N-type MOS transistor Q34 is the output end of the fourth switch tube; preferably, the fifth switch tube is an NPN transistor Q16, and the base of the NPN transistor Q16 is the fifth switch tube The collector of the NPN transistor Q16 is the input terminal of the fifth switch tube, and the emitter of the NPN transistor Q16 is the output terminal of the fifth switch tube.

The key point of the design of this utility model is that it mainly uses the OP power detection module to realize that the fan can only be started if the system power exceeds a certain value, which saves energy and has strong practicability. Moreover, through the high-temperature induction delay module, the system suddenly When it drops to a certain value, if the temperature is too high, it will not stop the fan like in the traditional technology. It can delay the control of the fan to continue to rotate and dissipate heat through the high temperature sensing delay module, prolonging the service life of the power supply and improving the safety and reliability of the system. .

The above are only preferred embodiments of the present utility model, and do not limit the technical scope of the present utility model in any way, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model, All still belong to within the scope of the technical solution of the utility model.

Claims (9)

1. a kind of power supply fan novel temperature control circuit, is connected to fan CON3, it is characterised in that: control mould including temperature sense Block, power control unit, the first power supply, the second power supply, OP power detection module and high temperature incude Postponement module； The power control unit is separately connected the first power supply, the second power supply；Temperature sense control module connects fan CON3, the first power supply are separately connected temperature sense control module and fan CON3, and the second power supply connects fan CON3, OP power detection module is separately connected power control unit, high temperature induction Postponement module, temperature sense control module；The OP function Rate detection module includes current transformer OP, first switch tube, and first switch tube is electrically connected to current transformer OP and temperature sense It answers between control module, the voltage for driving first switch tube to be connected is connected between current transformer OP and first switch tube Node；The high temperature induction Postponement module includes the thermistor TH4 for controlling aforesaid voltage node voltage value.

2. power supply fan novel temperature control circuit according to claim 1, it is characterised in that: the OP power detection module is also It include diode D16, resistance R84, resistance R47, resistance R83, resistance R143 and second switch, current transformer OP's Output end connects the anode of diode D16, and the cathode of diode D16 connects one end of resistance R84, and the other end of resistance R84 is same When connection first switch tube control terminal and resistance R47 one end, the other end of resistance R47 and the output end of first switch tube are equal Ground connection, the input terminal of first switch tube connect one end, one end of resistance R143 and the control of second switch of resistance R83 simultaneously End processed, the other end of resistance R83 connect the output end of the first power supply, the other end of resistance R143 and second switch it is defeated Outlet is grounded, and the input terminal of second switch connects temperature sense control module.

3. power supply fan novel temperature control circuit according to claim 2, it is characterised in that: the power control unit has Transformer, the transformer are electrically connected in the first power supply, the second power supply；The current transformer OP has electricity The induction input terminal of primary coil, the secondary coil felt and be sheathed on inductance, the primary coil is series at transformer；It is described One end of the inductive output of secondary coil is connect with the anode of the diode D16, other end ground connection.

4. power supply fan novel temperature control circuit according to claim 2, it is characterised in that: the control terminal of second switch is logical Cross switch key SW1 ground connection.

5. power supply fan novel temperature control circuit according to claim 2, it is characterised in that: the first switch tube is NPN The base stage of type triode Q32, NPN type triode Q32 are the control terminal of first switch tube, and the current collection of NPN type triode Q32 is extremely The input terminal of first switch tube, the output end of the transmitting extremely first switch tube of NPN type triode Q32.

6. power supply fan novel temperature control circuit according to claim 2, it is characterised in that: the second switch is N-type The grid of metal-oxide-semiconductor Q31, N-type metal-oxide-semiconductor Q31 are the control terminal of second switch, and the drain electrode of N-type metal-oxide-semiconductor Q31 is second switch Input terminal, the source electrode of N-type metal-oxide-semiconductor Q31 is the output end of second switch.

7. power supply fan novel temperature control circuit according to claim 2, it is characterised in that: the high temperature incudes Postponement module It further include capacitor C34 and capacitor C31, one end of thermistor TH4 connects one end and the diode D16 of capacitor C34 simultaneously The other end of cathode, thermistor TH4 connects one end of capacitor C31 and the control terminal of first switch tube simultaneously, and capacitor C34's is another The other end of one end and capacitor C31 are grounded；The thermistor TH4 is in parallel with resistance R84, and the thermistor TH4 is negative Temperature coefficient thermistor.

8. power supply fan novel temperature control circuit according to claim 3, it is characterised in that: the temperature sense control module Including thermistor TH2, polar capacitor C74, third switching tube, the 4th switching tube, the 5th switching tube, resistance R73, resistance R82, Resistance 64, resistance R65, diode D12 and capacitor C45, aforementioned first power supply connect the one of thermistor TH2 simultaneously The other end of the input terminal at end, one end of resistance 64 and the 5th switching tube, thermistor TH2 connects third switching tube simultaneously The control terminal of the input terminal of control terminal, the anode of polar capacitor C74 and first switch tube, third switching tube is connect by resistance R73 Ground, the other end of resistance 64 connect the input terminal of the control terminal of the 5th switching tube, third switching tube simultaneously, third switching tube it is defeated Outlet is grounded by resistance R82, one end of the output end connection fan CON3 of the 5th switching tube, the other end connection of fan CON3 The input terminal of 4th switching tube, the control terminal of the control terminal connection third switching tube of the 4th switching tube, the output of the 4th switching tube End ground connection, the anode of aforementioned second power supply connection diode D12, one end of the anode connection resistance R65 of diode D12, The other end of resistance R65 connects one end of the output end of the 5th switching tube, capacitor C45, the cathode polar region of capacitor C45 simultaneously.

9. power supply fan novel temperature control circuit according to claim 8, it is characterised in that: the third switching tube is NPN The base stage of type triode Q33, NPN type triode Q33 are the control terminal of third switching tube, and the current collection of NPN type triode Q33 is extremely The input terminal of third switching tube, the output end of the transmitting extremely third switching tube of NPN type triode Q33；4th switching tube For N-type metal-oxide-semiconductor Q34, the grid of N-type metal-oxide-semiconductor Q34 is the control terminal of four switching tubes, and the drain electrode of N-type metal-oxide-semiconductor Q34 is the 4th switch The input terminal of pipe, the source electrode of N-type metal-oxide-semiconductor Q34 are the output end of the 4th switching tube；5th switching tube is NPN type triode The base stage of Q16, NPN type triode Q16 are the control terminal of the 5th switching tube, and the current collection of NPN type triode Q16 the extremely the 5th switchs The input terminal of pipe, the output end of transmitting extremely the 5th switching tube of NPN type triode Q16.