CN112460060B - Fan control circuit and equipment comprising same - Google Patents
Fan control circuit and equipment comprising same Download PDFInfo
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- CN112460060B CN112460060B CN202011420343.5A CN202011420343A CN112460060B CN 112460060 B CN112460060 B CN 112460060B CN 202011420343 A CN202011420343 A CN 202011420343A CN 112460060 B CN112460060 B CN 112460060B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
Abstract
The application relates to a fan control circuit and equipment comprising the same. Wherein, in fan control circuit, through setting up the driver chip including the adjustment pin who is used for adjusting the minimum rotational speed of fan, thereby realize the regulation to fan minimum rotational speed, make the fan can operate under lower voltage, and make the fan can consume the most energy of components and parts storage such as inductance capacitance among the control circuit after the equipment outage, and then avoid the oscillation of outage in-process main chip reset pin, and need not set up peripheral filtering absorption circuit to reset circuit, the cost is reduced.
Description
Technical Field
The application relates to the technical field of control circuits, in particular to a fan control circuit and equipment comprising the same.
Background
In various current electrical appliances, the application of a fan/blower is very common, for example, in a current air-cooled refrigerator, compartments such as a refrigerating compartment are refrigerated based on a freezing blower, and in the current air-cooled refrigerator, a 12V dc brushless motor is mostly used, and the voltage of the fan is adjusted by adjusting the duty ratio of a main control driving circuit to chop, so as to adjust the rotating speed of the fan. Due to the control of the voltage regulating mode, when the refrigerator is powered off, the voltage output by the main control board is reduced, and when the voltage is reduced to the fan stop voltage, the fan starts to stop rotating, and the waveform of the reset pin of the main chip can generate multiple oscillation phenomena, so that the parameter value set by software can be influenced under severe conditions. For the oscillation, the common solutions are to connect a diode and a capacitor filter absorption in parallel at the reset pin, or add a reset chip for control, but these solutions increase the cost of the reset circuit to some extent. In view of the above, there is a need for a solution that better eliminates the main control board reset oscillation.
Disclosure of Invention
The application provides a fan control circuit and equipment comprising the same, and aims to solve the problem that the reset circuit cost is increased by a scheme adopted when the oscillation phenomenon of a reset pin of a main chip is processed in the related art.
The above object of the present application is achieved by the following technical solutions:
in a first aspect, an embodiment of the present application provides a fan control circuit, which includes: the circuit comprises a main chip, a reset circuit and a voltage regulating circuit which are connected with the main chip, and a driving circuit which is connected with the voltage regulating circuit; wherein the content of the first and second substances,
the reset circuit comprises a reset resistor and a reset capacitor, one end of the reset resistor and one end of the reset capacitor are both connected with a reset pin of the main chip, the other end of the reset resistor is connected to a first preset voltage, the other end of the reset capacitor is grounded, and the reset circuit is used for resetting the main chip;
the voltage regulating circuit is used for outputting adjustable voltage to the driving circuit;
the driving circuit comprises a driving chip and is used for driving the fan to operate by using the adjustable voltage output by the voltage regulating circuit;
the driving chip comprises an adjusting pin for adjusting the minimum rotating speed of the fan, and after the minimum rotating speed of the fan is adjusted through the adjusting pin, when the voltage in each circuit is reduced due to the disconnection of a power supply, the time for reducing the first preset voltage to the minimum working voltage of the main chip is less than the sum of the time for reducing the voltage of the reset pin of the main chip to the preset reset voltage and the maintaining time for maintaining the reset signal by the reset pin of the main chip when the reset action is triggered.
Optionally, the adjustment pin is a stall speed setting pin or a stall voltage setting pin.
Optionally, the adjusting pin is grounded through a divider resistor, and the minimum rotating speed of the fan is adjusted by adjusting the resistance value of the divider resistor.
Optionally, the reset circuit is specifically configured to: and when the voltage of the reset pin of the main chip is less than the preset reset voltage, resetting the main chip.
Optionally, the voltage regulating circuit is a dc chopper circuit.
Optionally, the voltage regulating circuit includes a chopper module and a filter module;
the chopping module is used for chopping an input rated power supply voltage based on a control signal output by the main chip and then outputting the chopped rated power supply voltage, and the filtering module is used for filtering the output of the chopping module to obtain the adjustable voltage.
Optionally, the chopper module includes: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode, a second diode and a third diode; the first triode is an NPN triode, and the second triode is a PNP triode;
one end of the first resistor is connected with a pulse width modulation pin of the main chip, and the other end of the first resistor is respectively connected with one end of the second resistor and a base electrode of the first triode;
the other end of the second resistor and the emitting electrode of the first triode are both grounded;
the collector of the first triode is connected with one end of the third resistor;
the other end of the third resistor is respectively connected with one end of the fourth resistor and the base electrode of the second triode;
the other end of the fourth resistor, the emitting electrode of the second triode and the negative electrode of the second diode are connected and connected with a rated power supply voltage;
a collector of the second triode is connected with the anode of the second diode and is used as the anode output of the chopping module;
and the cathode of the third diode is connected with the anode of the second diode, and the anode of the third diode is grounded and is used as the cathode output of the chopping module.
Optionally, the filtering module includes: a first inductor and a first capacitor;
one end of the first inductor is connected with the anode output of the chopping module, and the other end of the first inductor is connected with the anode of the first capacitor and used as the anode output of the adjustable voltage;
and the negative electrode of the first capacitor is connected with the negative electrode output of the chopping module and is used as the negative electrode output of the adjustable voltage.
In a second aspect, an embodiment of the present application provides an apparatus including a fan, which further includes the fan control circuit of any one of the first aspects, connected to the fan.
Optionally, the device is a refrigerator, and the fan is a refrigeration fan of the refrigerator.
Optionally, the refrigerator includes a plurality of refrigeration gears and a plurality of fan control circuits corresponding to the refrigeration gears in sequence, and each fan control circuit is used for adjusting the minimum rotation speed of the fan at the corresponding refrigeration gear.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the fan control circuit that the embodiment of this application provided, drive chip including the adjustment pin who is used for adjusting the minimum rotational speed of fan through the setting, thereby realize the regulation to fan minimum rotational speed, make the fan can operate under lower voltage, and make the fan can consume the most energy of components and parts storage such as inductance capacitance among the control circuit after the equipment outage, and then avoid the oscillation of outage in-process main chip reset pin, and need not set up peripheral filtering absorption circuit to reset circuit, the cost is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a reset circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a fan control circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a voltage regulating circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an EUM6898R/S driver chip.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
In order to make the technical solution of the present application easier to understand, a brief description of the related art is first provided. Referring to fig. 1, fig. 1 is a most basic reset circuit in the prior art, wherein the reset circuit only includes a reset resistor R5 and a reset capacitor C3, one end of the reset resistor R5 and one end of the reset capacitor C3 are both connected to a reset pin of a main chip (i.e., the REST end in fig. 1 is connected to the reset pin of the main chip), and the other end of the reset resistor R5 is connected to a first preset voltage (+ 5V in fig. 1).
The working principle of the reset circuit is as follows: firstly, a reset voltage is preset (through software) based on the minimum working voltage of the main chip, the preset reset voltage is slightly smaller than the minimum working voltage of the main chip, and further, when the voltage of a reset pin of the main chip (namely, the voltage on the reset capacitor C3) is smaller than the preset reset voltage, the main chip cannot normally work, so that the main chip is reset at the moment, the main chip is enabled to restore to an initial state, in the reset process, the reset pin of the main chip continuously outputs a low-level signal (namely, a reset signal, the maintaining time of the reset signal is T), the main chip working voltage is enabled to charge the reset capacitor C3, the voltage of the reset pin gradually rises, when the voltage rises to be larger than the reset voltage, the main chip restores to normal work, and then the voltage of the reset pin is continuously detected, so that the next reset action is carried out.
In practical application, when the whole device is normally powered off, each circuit loses power input, and voltages (including the working voltage of the main chip and the first preset voltage for charging the reset capacitor) at each position in the circuit are reduced, but because energy stored in energy storage devices such as inductance capacitors and the like in each circuit is released outwards after the device is powered off, the working voltage and the first preset voltage of the main chip need to be reduced to 0 after a period of time, and then, a plurality of reset actions are triggered within a period of time after the device is powered off, namely reset oscillation is generated.
In order to solve the above-mentioned reset oscillation problem in the prior art, a more complex reset circuit is usually adopted, for example, a peripheral filter absorption circuit or even a chip is added, which inevitably increases the overall cost of the circuit.
Based on this, in order to solve the problem of reset oscillation when the equipment is powered off in the related art, the application provides an improved fan control circuit and equipment applying the fan control circuit. The following examples are given for the purpose of illustration.
Examples
Referring to fig. 2, the present embodiment provides a fan control circuit, which at least includes: the circuit comprises a main chip 1, a reset circuit 2 and a voltage regulating circuit 3 which are connected with the main chip 1, and a driving circuit 4 which is connected with the voltage regulating circuit 3; the reset circuit 2 adopts the reset circuit shown in fig. 1; the voltage regulating circuit 3 is used for outputting adjustable voltage to the driving circuit 4; the driving circuit 4 comprises a driving chip and is used for driving the fan to operate by using the adjustable voltage output by the voltage adjusting circuit 3;
the driving chip comprises an adjusting pin for adjusting the minimum rotating speed of the fan, after the minimum rotating speed of the fan is adjusted through the adjusting pin, when the voltage in each circuit is reduced due to the disconnection of a power supply, the time T1 for reducing the first preset voltage to the minimum working voltage of the main chip 1 is less than the sum T2 for reducing the voltage of the reset pin of the main chip 1 to the preset reset voltage and the maintaining time T for maintaining the reset signal of the reset pin of the main chip 1 when the reset action is triggered, wherein the sum T2+ T is obtained by adding the first preset voltage to the minimum working voltage of the main chip 1.
Specifically, after research, it is found that the root cause of the reset oscillation is the magnitude relationship between the LC energy storage device in the circuit part after power off and the energy release of the fan and the preceding stage circuit, that is, in the process of energy release of the LC energy storage device after power off, when the circuit voltage is greater than the minimum operating voltage (stall voltage) of the fan, the stored energy is released to the fan to maintain the fan to continue to rotate, and when the voltage after energy release is less than the minimum operating voltage of the fan, the remaining energy is released to the preceding stage circuit (main chip, etc.) on the main control board. Furthermore, if the fan stall voltage is large, more energy is released to the front-stage circuit, so that the first preset voltage for charging the reset capacitor C3 is slowly reduced, and the oscillation condition is satisfied; and if the fan stalling voltage is smaller, more stored energy is released to the fan, so that the energy released to the front-stage circuit is relatively less, and further the first preset voltage is reduced relatively quickly, and the oscillation condition is not met.
Based on this, the driving chip adopted in the driving circuit of the present embodiment includes an adjusting pin capable of adjusting the minimum rotation speed of the fan, wherein the minimum rotating speed (also called the stalling rotating speed) is positively correlated with the minimum working voltage (also called the stalling voltage), and the minimum rotating speed of the fan is adjusted through the adjusting pin, thereby changing the time T1 when the first preset voltage is reduced to the minimum working voltage of the main chip 1, when T1 < T2+ T, that is, the time when the first preset voltage is reduced to the minimum working voltage of the main chip 1 is less than the sum of the time when the voltage of the reset pin of the main chip 1 is reduced to the preset reset voltage and the maintaining time when the reset pin of the main chip 1 maintains the reset signal when the reset action is triggered, the oscillation of the reset pin of the main chip can be eliminated, and the improvement on the circuits such as the main chip, the reset circuit, the voltage regulating circuit and the like in the original fan control circuit is not needed.
The aforementioned adjusting pin for adjusting the minimum rotation speed of the fan may be a stall rotation speed setting pin or a stall voltage setting pin, and corresponds to different driver chips, for example, the RMIN pin of the driver chip of model EUM6898R is a stall rotation speed setting pin (minimum rotation speed setting pin), the STOP pin of the driver chip of model EUM6898S is a stall voltage setting pin (minimum operating voltage setting pin), and the MIN pin of model APX9262P is a minimum rotation speed setting pin.
When the EUM6898R/S driving chip is applied, the adjusting pin of the minimum rotating speed is grounded through the voltage dividing resistor, and the minimum rotating speed of the fan can be adjusted by adjusting the resistance value of the voltage dividing resistor.
Of course, it should be understood that the types of the driving chips given above are only exemplary, and other types of driving chips may be adopted in practical applications as long as the corresponding functions can be realized.
In the fan control circuit provided in the above-mentioned embodiment, through setting up the driver chip including the adjustment pin who is used for adjusting the minimum rotational speed of fan, thereby realize the regulation to fan minimum rotational speed, make the fan can operate under lower voltage, and make the fan can consume the most energy of components and parts storage such as inductance capacitance among the control circuit after the equipment outage, and then avoid the oscillation of main chip reset pin among the outage in-process, and need not set up peripheral filtering absorption circuit to reset circuit, the cost is reduced.
In order to make the solution of the present application easier to understand, it is further explained below by a specific example.
In this embodiment, the rated voltage of the fan is 12V, the resistance of the reset resistor R5 in the reset circuit 2 is 10K, the reset capacitor C3 is a 0.1uF ceramic capacitor, and the first preset voltage for supplying power to the reset capacitor C3 is 5V. The minimum working voltage of the main chip is 2.7V, the reset voltage is 2.5V, and the maintaining time T during resetting is 100 ms.
The first preset voltage of 5V can be regulated and output by a 7805 three-terminal voltage regulation integrated circuit, when the power supply input is disconnected, the 12V power supply voltage begins to drop, and when the 12V power supply voltage drops below 7.5V, the first preset voltage of 5V begins to drop, and the time when the first preset voltage of 5V drops to the minimum working voltage 2.7V of the main chip is t 1. When the first preset voltage of 5V starts to fall, the reset pin voltage falls simultaneously, and the time for falling to the reset voltage of 2.5V is t 2.
In addition, as shown in fig. 3, the voltage regulating circuit 3 is a dc chopper circuit, which includes a chopper module and a filter module; the chopping module comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first triode Q10, a second triode TIP127, a second diode D2 and a third diode D3; the filtering module comprises a first inductor L1 and a first capacitor C1; the first triode Q10 is an NPN type triode, and the second triode TIP127 is a PNP type triode;
one end (FS end in fig. 3) of the first resistor R1 is connected to the pwm pin of the main chip 1 for receiving the control signal of the main chip 1, and the other end is connected to one end of the second resistor R2 and the base of the first transistor Q10, respectively; the other end of the second resistor R2 and the emitter of the first triode Q10 are both grounded; the collector of the first triode Q10 is connected with one end of a third resistor R3; the other end of the third resistor R3 is respectively connected with one end of a fourth resistor R4 and the base of a second triode TIP 127; the other end of the fourth resistor R4, the emitter of the second triode TIP127 and the cathode of the second diode D2 are connected and connected with a rated power supply voltage (+ 12V); the collector of the second triode TIP127 is connected with the anode of a second diode D2 and serves as the anode output of the chopper module; one end of the first inductor L1 is connected with the positive electrode output of the chopping module, and the other end of the first inductor L1 is connected with the positive electrode end of the first capacitor C1 and used as the positive electrode output of the filtered adjustable voltage; the cathode of the third diode D3 is connected with the anode of the second diode D2, and the anode is grounded and used as the cathode output of the chopper module; and the negative electrode of the first capacitor C1 is connected with the negative electrode output of the chopping module and is used as the negative electrode output of the filtered adjustable voltage.
Specifically, the voltage regulating circuit sends a PWM (pulse width modulation) signal from the main chip 1 to control the on and off of the second triode TIP127, so as to chop the input 12V supply voltage, and the chopped output is subjected to LC filtering by the first inductor L1 and the first capacitor C1 to output an adjustable voltage for the fan driving circuit.
Of course, it should be understood that the circuit configuration of the voltage regulating circuit 3 shown in this embodiment is merely an example, and in practical applications, other circuit configurations may be adopted as long as the intended function can be achieved, and the circuit configuration is not limited thereto.
In addition, as shown in fig. 4, among the pins of the drive chip with the model number of EUM6898R/S, VCC is a power supply input, and the FG pin is a rotation speed output and detection pin, and is connected with a three-wire fan yellow rotation speed feedback line. OUT1 and OUT2 are connected to the fan rotor. The SS pin is externally connected with a capacitor and used for adjusting the restarting time and the stalling time. HB. IN and IN are Hall detection pins for detecting the position of the rotor, and the rotating speed is accurately adjusted through detection and correction of an internal operational amplifier circuit. The PWM pin is not used. The RMIN/STOP pin is the minimum speed setting pin. SL, SW are connected with resistance to ground. And the SL pin voltage is used for setting the rotating speed slope and regulating the speed. And adjusting the resistance of the SW pin to complete the setting of the noise suppression mode.
The RMIN/STOP pin is grounded through a voltage dividing resistor R0 in practical application, and the minimum working operation voltage of the fan can be changed by adjusting the resistance value of the voltage dividing resistor R0, so that the time T1 when 5V is reduced to the minimum working voltage of the main chip is changed, and the oscillation of the reset pin of the main chip can be eliminated when T1 is less than T2+ T.
In addition, when the fan control circuit described in the above embodiment is applied to a device including a fan, oscillation of the main chip reset pin after power failure in the use process of the device can be avoided.
When the fan control circuit is applied to a refrigerator, a plurality of fan control circuits corresponding to the refrigeration gears in sequence can be arranged according to the refrigeration gears included in the refrigerator, so that the minimum rotating speeds of the fans under different refrigeration gears can be respectively adjusted through the fan control circuits.
For example, when the refrigerator includes three high, medium, and low gears, three fan control circuits may be provided, and the minimum rotation speed setting pin of the driving chip in different fan control circuits is externally connected with voltage dividing resistors with different resistances, so that the pin corresponds to the collected potentials of the high, medium, and low gears, and corresponds to the minimum working voltages of the fans in the high, medium, and low gears. When the minimum working voltage of the fans of the high gear, the medium gear and the low gear corresponds to the time T1 when the +5V of the three groups of main chips is reduced to the minimum working voltage and the time T2 when the voltage of the reset pin of the main chip is reduced to the reset voltage of 2.5V, which both meet the conditions that T1 is less than T2+ T, the oscillation phenomenon of the reset pin of the main chip can not occur when the refrigerator is powered off at each gear.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (11)
1. A fan control circuit, comprising: the circuit comprises a main chip, a reset circuit and a voltage regulating circuit which are connected with the main chip, and a driving circuit which is connected with the voltage regulating circuit; wherein the content of the first and second substances,
the reset circuit comprises a reset resistor and a reset capacitor, one end of the reset resistor and one end of the reset capacitor are both connected with a reset pin of the main chip, the other end of the reset resistor is connected to a first preset voltage, the other end of the reset capacitor is grounded, and the reset circuit is used for resetting the main chip;
the voltage regulating circuit is used for outputting adjustable voltage to the driving circuit;
the driving circuit comprises a driving chip and is used for driving the fan to operate by using the adjustable voltage output by the voltage regulating circuit;
the driving chip comprises an adjusting pin for adjusting the minimum rotating speed of the fan, and after the minimum rotating speed of the fan is adjusted through the adjusting pin, when the voltage in each circuit is reduced due to the disconnection of a power supply, the time for reducing the first preset voltage to the minimum working voltage of the main chip is less than the sum of the time for reducing the voltage of the reset pin of the main chip to the preset reset voltage and the maintaining time for maintaining the reset signal by the reset pin of the main chip when the reset action is triggered.
2. The fan control circuit of claim 1 wherein the adjustment pin is a stall speed setting pin or a stall voltage setting pin.
3. The fan control circuit according to claim 2, wherein the adjustment pin is grounded through a voltage dividing resistor, and the minimum rotation speed of the fan is adjusted by adjusting the resistance value of the voltage dividing resistor.
4. The fan control circuit of claim 1, wherein the reset circuit is specifically configured to: and when the voltage of the reset pin of the main chip is less than the preset reset voltage, resetting the main chip.
5. The fan control circuit of claim 1, wherein the voltage regulator circuit is a dc chopper circuit.
6. The fan control circuit of claim 5, wherein the voltage regulator circuit comprises a chopper module and a filter module;
the chopping module is used for chopping an input rated power supply voltage based on a control signal output by the main chip and then outputting the chopped rated power supply voltage, and the filtering module is used for filtering the output of the chopping module to obtain the adjustable voltage.
7. The fan control circuit of claim 6, wherein the chopping module comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first triode, a second diode and a third diode; the first triode is an NPN triode, and the second triode is a PNP triode;
one end of the first resistor is connected with a pulse width modulation pin of the main chip, and the other end of the first resistor is respectively connected with one end of the second resistor and a base electrode of the first triode;
the other end of the second resistor and the emitting electrode of the first triode are both grounded;
the collector of the first triode is connected with one end of the third resistor;
the other end of the third resistor is respectively connected with one end of the fourth resistor and the base electrode of the second triode;
the other end of the fourth resistor, the emitting electrode of the second triode and the negative electrode of the second diode are connected and connected with a rated power supply voltage;
a collector of the second triode is connected with the anode of the second diode and is used as the anode output of the chopping module;
and the cathode of the third diode is connected with the anode of the second diode, and the anode of the third diode is grounded and is used as the cathode output of the chopping module.
8. The fan control circuit of claim 7, wherein the filtering module comprises: a first inductor and a first capacitor;
one end of the first inductor is connected with the anode output of the chopping module, and the other end of the first inductor is connected with the anode of the first capacitor and used as the anode output of the adjustable voltage;
and the negative electrode of the first capacitor is connected with the negative electrode output of the chopping module and is used as the negative electrode output of the adjustable voltage.
9. An apparatus comprising a fan, further comprising a fan control circuit as claimed in any one of claims 1 to 8 connected to the fan.
10. The apparatus of claim 9, wherein the apparatus is a refrigerator and the fan is a cooling fan of the refrigerator.
11. The apparatus of claim 10, wherein the refrigerator comprises a plurality of cooling gears and a plurality of fan control circuits corresponding to the cooling gears in sequence, each fan control circuit being configured to adjust a minimum rotational speed of the fan at the corresponding cooling gear.
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| CN202011420343.5A CN112460060B (en) | 2020-12-07 | 2020-12-07 | Fan control circuit and equipment comprising same |
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| CN202011420343.5A CN112460060B (en) | 2020-12-07 | 2020-12-07 | Fan control circuit and equipment comprising same |
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| CN112460060B true CN112460060B (en) | 2021-07-23 |
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| CN113464481A (en) * | 2021-08-23 | 2021-10-01 | 小熊电器股份有限公司 | Desktop fan, and power-off protection control method and device for desktop fan |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174170A (en) * | 2006-11-03 | 2008-05-07 | 鸿富锦精密工业（深圳）有限公司 | Delaying movement control device of fan |
| CN210183602U (en) * | 2019-03-04 | 2020-03-24 | 上海晶丰明源半导体股份有限公司 | Control circuit, chip and actuating system of bleeder circuit |
| CN210201525U (en) * | 2019-08-16 | 2020-03-27 | 慧翰微电子股份有限公司 | Protection circuit of vehicle-mounted battery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI234325B (en) * | 2004-01-07 | 2005-06-11 | Delta Electronics Inc | Discharge protection circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101174170A (en) * | 2006-11-03 | 2008-05-07 | 鸿富锦精密工业（深圳）有限公司 | Delaying movement control device of fan |
| CN210183602U (en) * | 2019-03-04 | 2020-03-24 | 上海晶丰明源半导体股份有限公司 | Control circuit, chip and actuating system of bleeder circuit |
| CN210201525U (en) * | 2019-08-16 | 2020-03-27 | 慧翰微电子股份有限公司 | Protection circuit of vehicle-mounted battery |
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