CN209976847U - Isolated DC fan driving device - Google Patents
Isolated DC fan driving device Download PDFInfo
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- CN209976847U CN209976847U CN201920711898.1U CN201920711898U CN209976847U CN 209976847 U CN209976847 U CN 209976847U CN 201920711898 U CN201920711898 U CN 201920711898U CN 209976847 U CN209976847 U CN 209976847U
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Abstract
The utility model discloses an isolated DC fan driving device, which comprises a fan power supply module, a controller, an isolated driving module and an isolated power supply module; the fan power supply module is electrically connected with the fan and is suitable for providing a working power supply for the fan; the controller is in signal connection with the isolation driving module and is suitable for outputting PWM signals to the isolation driving module; the isolation driving module is in signal connection with the fan and is suitable for performing photoelectric isolation on the PWM signal to generate a driving signal and sending the driving signal to the fan to control the rotating speed of the fan; the isolation power supply module is electrically connected with the external power supply, the isolation driving module and the controller respectively and is suitable for isolating and converting the external power supply to generate a power supply required by the isolation power supply module and the controller. The utility model discloses an keep apart driven mode drive fan, improved drive circuit's interference killing feature, have slow start-up function and short-circuit protection function simultaneously, improved the reliability of fan work.
Description
Technical Field
The utility model relates to an isolated form direct current fan drive arrangement.
Background
In an internal heat dissipation system of an electric vehicle, an air cooling method is one of the commonly used cooling methods. Along with the continuous optimization of the performance of the fan, the air cooling mode is more and more prominent compared with the water cooling mode, which has the advantages of simple heat dissipation structure, low maintenance cost and the like, so that the air cooling mode is gradually the main cooling mode of the internal heat dissipation system of the electric automobile.
Generally, a blower mainly includes a fan and a driving device. The fan is an actuating element of the fan, and is generally divided into a two-wire system, a three-wire system and a four-wire system according to the connector structure of the fan, wherein the three-wire system is the most widely used type, and connecting wires of the three-wire system are divided into a power supply positive wire, a power supply negative wire and a driving signal wire; the driving device provides a stable power supply for the fan to work and carries out level conversion and conditioning on the driving signal. The fan needs a power supply to have strong transient response capability in the actual working process, and in order to compensate for the attenuation of a power supply connection line to the power supply capability of an external auxiliary power supply, a plurality of large capacitance devices are added at the power supply input end of the fan. Although the large capacitor devices have good decoupling effect, obvious starting current impact and supply voltage drop are caused in the power-on stage, and the problems that the fan is unstable in working in the power-on stage and the like are easily caused. The existing fan driving device generally connects a power line directly to a fan power supply loop, and if the power supply end is accidentally short-circuited or the fan power is large to cause the driving device to work in an overload mode, the driving device is easily driven to cause overheating damage. A control circuit and a fan motor in the existing fan driving device use the same power supply for supplying power, and the fan motor is easy to generate stronger electromagnetic interference during operation due to armature current transient and is conducted to the control circuit, so that the problems of out-of-control fan speed regulation and the like caused by distortion of a control signal are solved.
Disclosure of Invention
The utility model aims to solve the technical problem that overcome prior art's defect, provide an isolated form direct current fan drive arrangement, it adopts isolation driven mode drive fan, has improved drive circuit's interference killing feature, has slow start function and short-circuit protection function simultaneously, has improved the reliability of fan work.
In order to solve the technical problem, the technical scheme of the utility model is that: an isolated direct current fan driving device comprises a fan power supply module, a controller, an isolated driving module and an isolated power supply module; wherein,
the fan power supply module is electrically connected with the fan and is suitable for providing a working power supply for the fan;
the controller is in signal connection with the isolation driving module and is suitable for outputting PWM signals to the isolation driving module;
the isolation driving module is in signal connection with the fan and is suitable for performing photoelectric isolation on the PWM signal to generate a driving signal and sending the driving signal to the fan to control the rotating speed of the fan;
the isolation power supply module is electrically connected with the external power supply, the isolation driving module and the controller respectively and is suitable for isolating and converting the external power supply to generate a power supply required by the isolation power supply module and the controller.
Further, the fan power supply module comprises a slow start functional circuit and an overload protection functional circuit.
Further, the slow start function circuit comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, a diode D1 and a MOS transistor Q1; wherein,
the positive end of the external power supply is connected with the input end U1 of the slow start functional circuit, and the negative end of the external power supply is connected with the signal ground GND1 of the slow start functional circuit;
the input end U1 is connected to the source of the MOS transistor Q1, and the signal ground GND1 is connected to one end of the resistor R2;
one end of a parallel circuit formed by connecting the resistor R1, the capacitor C1 and the diode D1 in parallel is connected to the source of the MOS transistor Q1, and the other end is connected to the other end of the resistor R2 and the gate of the MOS transistor Q1.
The capacitor C2 is connected across the gate and the drain of the MOS transistor Q1.
Further, in order to prevent self-oscillation of the MOS transistor Q1, the other end of the parallel circuit formed by the resistor R1, the capacitor C1 and the diode D1 is connected to the gate of the MOS transistor Q1 through the resistor R3, and the capacitor C2 is connected to the gate of the MOS transistor Q1 through the resistor R4.
Further, the overload protection function circuit comprises a resistor R5, a resistor R6, a resistor R7, a capacitor C6, a triode Q2 and a triode Q3; wherein,
the input end U2 of the overload protection functional circuit is connected to the output end of the slow start functional circuit, and the signal ground GND1 of the overload protection functional circuit and the signal ground GND1 of the slow start functional circuit are connected together in common;
the emitter of the triode Q2 is connected with the input end U2, the base of the triode Q2 is connected with one end of the resistor R6, the collector of the triode Q2 is respectively connected with the base of the triode Q3 and one end of the resistor R5, the emitter of the triode Q3 is connected with the input end U2, and the collector of the triode Q3 serving as the output end U3 of the overload protection function circuit is respectively connected with the other end of the resistor R6, one end of the resistor R7 and one end of the capacitor C6;
the other end of the resistor R5, the other end of the resistor R7, and the other end of the capacitor C6 are connected to a signal ground GND1, respectively.
In order to further filter the input power of the overload protection functional circuit, the overload protection functional circuit further comprises a capacitor C3, one end of the capacitor C3 is connected to the input end U2, and the other end of the capacitor C3 is connected to the signal ground GND 1.
Further, in order to ensure that the overload protection functional circuit has self-recovery capability after the overload condition disappears, the overload protection functional circuit further comprises a capacitor C4 and a capacitor C5, wherein the capacitor C4 is bridged between the base and the collector of the transistor Q2, and the capacitor C5 is bridged between the base and the collector of the transistor Q3.
Further, the isolation driving module comprises a resistor R8, a resistor R9, a resistor R10, a diode D3, a triode Q4 and an optical coupler Q5; wherein,
the input end U5 of the isolation driving module is connected to the positive end of an external power supply, and the signal ground GND1 of the isolation driving module is connected to the negative end of the external power supply;
the output end PWM _ IN of the controller is connected to one end of the resistor R10;
the base electrode of the triode Q4 is connected to the other end of the resistor R10, the collector electrode is connected to the low end of the input side of the optocoupler Q5, and the emitter electrode is connected to a signal ground GND 2;
one end of the resistor R8 is connected to the power input end U4, and the other end is connected to the high end of the input side of the optocoupler Q5;
the high end of the output side of the optical coupler Q5 is used as a driving signal output end PWM _ OUT and connected to the control signal input end of the fan, the high end of the output side of the optical coupler Q5 is also connected to the input end U5 of the isolation driving module through a resistor R9, and the low end of the output side of the optical coupler Q5 is connected to the signal ground GND1 of the isolation driving module; a diode D3 is connected in reverse across the output of the optocoupler Q5.
Further, IN order to perform dc blocking processing on the output signal of the controller, filter out the dc component IN the PWM signal and retain the ac component thereof, a capacitor C7 is connected IN series between the output terminal PWM _ IN of the controller and the resistor R10.
Further, in order to provide a fast discharge path for the capacitor C7, the isolation driving module further includes a diode D2 and a resistor R11, a cathode of the diode D2 is connected to the capacitor C7, an anode of the diode D2 is connected to one end of the resistor R11, and the other end of the resistor R11 is connected to the signal ground GND 2.
After the technical scheme is adopted, the utility model discloses following beneficial effect has:
1. the utility model realizes the electrical isolation of the isolation driving module and the fan, and effectively avoids the problem that the fan is unstable due to the distortion caused by the electromagnetic interference generated when the fan operates on the driving signal in the prior device;
2. the utility model realizes the slow start function of the fan at the power-on stage, inhibits the current impulse response at the power-on stage, and solves the problems of insufficient transient response of the power supply, voltage drop and the like caused by overlarge current at the power-on stage of the existing device;
3. the utility model discloses driven fan can automatic shutdown work under the overload condition to automatic recovery after the overload condition disappears has solved current device and has lasted the work and arouse overheated damage scheduling problem under the overload condition.
Drawings
Fig. 1 is a schematic structural view of an isolated dc fan driving device according to the present invention;
fig. 2 is a circuit diagram of the fan power supply module of the present invention;
fig. 3 is a circuit diagram of the isolated driving module of the present invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, the following detailed description of the present invention is provided in connection with the accompanying drawings.
As shown in fig. 1 to 3, an isolated dc fan driving device includes a fan power supply module, a controller, an isolated driving module and an isolated power supply module; wherein,
the fan power supply module is electrically connected with the fan and is suitable for providing a working power supply for the fan;
the controller is in signal connection with the isolation driving module and is suitable for outputting PWM signals to the isolation driving module;
the isolation driving module is in signal connection with the fan and is suitable for performing photoelectric isolation on the PWM signal to generate a driving signal and sending the driving signal to the fan to control the rotating speed of the fan;
the isolation power supply module is electrically connected with the external power supply, the isolation driving module and the controller respectively and is suitable for isolating and converting the external power supply to generate a power supply required by the isolation power supply module and the controller.
As shown in fig. 2, the fan power supply module includes a slow start functional circuit and an overload protection functional circuit.
As shown in fig. 2, the soft start functional circuit includes a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, a diode D1, and a MOS transistor Q1; wherein,
the positive end of the external power supply is connected with the input end U1 of the slow start functional circuit, and the negative end of the external power supply is connected with the signal ground GND1 of the slow start functional circuit;
the input end U1 is connected to the source of the MOS transistor Q1, and the signal ground GND1 is connected to one end of the resistor R2;
one end of a parallel circuit formed by connecting the resistor R1, the capacitor C1 and the diode D1 in parallel is connected to the source of the MOS transistor Q1, and the other end is connected to the other end of the resistor R2 and the gate of the MOS transistor Q1.
The capacitor C2 is connected across the gate and the drain of the MOS transistor Q1.
As shown in fig. 2, in order to prevent self-oscillation of the MOS transistor Q1, the other end of the parallel circuit formed by the resistor R1, the capacitor C1, and the diode D1 is connected to the gate of the MOS transistor Q1 through the resistor R3, and the capacitor C2 is connected to the gate of the MOS transistor Q1 through the resistor R4.
In the present embodiment, the diode D1 is a zener diode, and the MOS transistor Q1 is an enhancement P-channel MOS transistor.
Specifically, the slow start functional circuit is mainly used for charging a gate-source capacitor C1 and a gate-drain capacitor C2 of the MOS transistor Q1 in the power-on process of the external power supply to control the power-on time sequence of the gate-source voltage Ugs and the gate-drain voltage Ugd, so that the MOS transistor Q1 is gradually turned on, and the purpose of suppressing current overshoot at the power-on moment is achieved. In order to realize the soft start function, the MOS transistor Q1 performs an on-off switching action, the capacitor C1 and the resistor R2 function to realize the anti-jitter delay function of the soft start function circuit, the resistor R1 function to provide a fast discharge channel for the capacitor C1, the diode D1 is used to protect the gate and the source of the MOS transistor Q1 from high voltage breakdown, the resistor R3 and the capacitor C2 are used to control the rising slope of the source-to-drain current in the MOS transistor Q1, and the resistor R3 and the resistor R4 are used to prevent the MOS transistor from self-oscillation.
As shown in fig. 2, the overload protection function circuit includes a resistor R5, a resistor R6, a resistor R7, a capacitor C6, a transistor Q2, and a transistor Q3; wherein,
the input end U2 of the overload protection functional circuit is connected to the output end of the slow start functional circuit, and the signal ground GND1 of the overload protection functional circuit and the signal ground GND1 of the slow start functional circuit are connected together in common;
the emitter of the triode Q2 is connected with the input end U2, the base of the triode Q2 is connected with one end of the resistor R6, the collector of the triode Q2 is respectively connected with the base of the triode Q3 and one end of the resistor R5, the emitter of the triode Q3 is connected with the input end U2, and the collector of the triode Q3 serving as the output end U3 of the overload protection function circuit is respectively connected with the other end of the resistor R6, one end of the resistor R7 and one end of the capacitor C6;
the other end of the resistor R5, the other end of the resistor R7, and the other end of the capacitor C6 are connected to a signal ground GND1, respectively.
As shown in fig. 2, in order to filter the input power of the overload protection function circuit, the overload protection function circuit further includes a capacitor C3, one end of the capacitor C3 is connected to the input terminal U2, and the other end of the capacitor C3 is connected to the signal ground GND 1.
As shown in fig. 2, in order to ensure that the overload protection function circuit has self-recovery capability after the overload condition disappears, the overload protection function circuit further includes a capacitor C4 and a capacitor C5, the capacitor C4 is connected across the base and the collector of the transistor Q2, and the capacitor C5 is connected across the base and the collector of the transistor Q3.
In this embodiment, the transistor Q2 and the transistor Q3 are PNP transistors.
In particular, the overload protection function circuit is mainly used to prevent the output load current of the circuit from being too large to cause permanent thermal damage to the transistor. The capacitor C3 is used as an input end filter capacitor for carrying out filter processing on the input power supply; the capacitor C6 is used as an output decoupling capacitor to improve the transient response capability of the circuit. The capacitor C4 and the capacitor C5 are used as energy storage capacitors to ensure that the overload protection functional circuit has self-recovery capability after the overload condition disappears; the resistor R5, the resistor R6 and the resistor R7 are used for adjusting the overload response time and the self-recovery response time of the circuit; the transistor Q2 and the transistor Q3 are used to perform switching during the switching of the circuit operating state.
The working process of the overload protection function circuit can be described as follows:
during the power-on period, the voltage at the two ends of the capacitor C4 cannot change suddenly to enable the base of the triode Q2 to keep a high level, the triode Q2 is in a cut-off state, the capacitor C5 enables the base of the triode Q3 to keep a low level, the triode Q3 is in a conducting state, meanwhile, after the triode Q3 is conducted, the collector of the triode Q3 changes from low to high, the base of the triode Q2 still keeps the high level and is locked in the cut-off state, the base of the triode Q3 keeps the low level and is locked in the conducting state, and the output end U3 can supply power to the.
When the circuit is in an overload state, the base potential of the transistor Q2 is also lowered due to the falling of the collector potential of the transistor Q3, the base current of the transistor Q2 is gradually formed and conducted, after the transistor Q2 is conducted, the base potential of the transistor Q3 is raised and the base current is gradually reduced due to the fact that the collector level of the transistor Q2 is changed from low to high, the transistor Q3 is gradually locked in a cut-off state due to conduction, therefore, the input end U2 no longer provides current for the output end U3, and the whole circuit is in an open circuit state.
When the overload condition of the circuit output end is relieved, the capacitor C4 starts to discharge through the resistors R6 and R7, the base potential of the transistor Q2 starts to be changed from low to high, the transistor Q2 is gradually changed from conduction to cut-off state, the collector potential of the transistor Q2 is changed from high to low, the capacitor C5 starts to charge, the base potential of the transistor Q3 is changed from high to low, the transistor Q3 is gradually changed from cut-off to conduction, finally, the base of the transistor Q3 keeps low level continuously and is locked in a conduction state, and the output end U3 continues to supply power to the fan.
As shown in fig. 3, the isolation driving module includes a resistor R8, a resistor R9, a resistor R10, a diode D3, a transistor Q4, and an optocoupler Q5; wherein,
the input end U5 of the isolation driving module is connected to the positive end of an external power supply, and the signal ground GND1 of the isolation driving module is connected to the negative end of the external power supply;
the output end PWM _ IN of the controller is connected to one end of the resistor R10;
the base electrode of the triode Q4 is connected to the other end of the resistor R10, the collector electrode is connected to the low end of the input side of the optocoupler Q5, and the emitter electrode is connected to a signal ground GND 2;
one end of the resistor R8 is connected to the power input end U4, and the other end is connected to the high end of the input side of the optocoupler Q5;
the high end of the output side of the optical coupler Q5 is used as a driving signal output end PWM _ OUT and connected to the control signal input end of the fan, the high end of the output side of the optical coupler Q5 is also connected to the input end U5 of the isolation driving module through a resistor R9, and the low end of the output side of the optical coupler Q5 is connected to the signal ground GND1 of the isolation driving module; a diode D3 is connected in reverse across the output of the optocoupler Q5.
As shown IN fig. 3, IN order to perform dc blocking processing on the output signal of the controller, filter out the dc component of the PWM signal and retain the ac component thereof, a capacitor C7 is connected IN series between the output terminal PWM _ IN of the controller and the resistor R10.
As shown in fig. 3, in order to provide a fast discharge path for the capacitor C7, the isolation driving module further includes a diode D2 and a resistor R11, a cathode of the diode D2 is connected to the capacitor C7, an anode of the diode D2 is connected to one end of a resistor R11, and the other end of the resistor R11 is connected to the signal ground GND 2.
In this embodiment, the triode Q4 is an NPN type triode, the diode D2 is a schottky diode, the diode D3 is a zener diode, and the optocoupler Q5 is a nonlinear optocoupler.
Specifically, the isolation driving module is mainly used for inputting PWM signals output by the controller to a control signal end of the fan after electrical isolation, and the purpose of electrical isolation processing is to prevent abnormal PWM waveforms of driving signals caused by transmission of interference signals caused by transient armature currents in the fan to the output end of the controller, so that normal work of the fan is influenced. The optical coupler Q5 is used for electrically isolating the output end of the controller from the input end of the fan; the capacitor C7 is used for carrying out DC blocking processing on the output signal of the controller, filtering out the DC component in the PWM signal and keeping the AC component; the diode D2 and the resistor R11 are used for providing a quick discharge channel for the capacitor C7; the resistor R10 is used for adjusting the base current of the triode Q4 and ensuring that the triode Q4 works in a saturation state; the resistor R8 is used for adjusting the input current of the optocoupler Q5; the resistor R9 is used as a pull-up resistor, so that the load driving capability of the module is improved; the diode D3 is used to reduce voltage fluctuation during the output of a high-level signal.
The working principle of the utility model is as follows:
the utility model realizes the electrical isolation of the isolation driving module and the fan, and effectively avoids the problem that the fan is unstable due to the distortion caused by the electromagnetic interference generated when the fan operates on the driving signal in the prior device; the utility model realizes the slow start function of the fan at the power-on stage, inhibits the current impulse response at the power-on stage, and solves the problems of insufficient transient response of the power supply, voltage drop and the like caused by overlarge current at the power-on stage of the existing device; the utility model discloses driven fan can automatic shutdown work under the overload condition to automatic recovery after the overload condition disappears has solved current device and has lasted the work and arouse overheated damage scheduling problem under the overload condition.
The above-mentioned embodiments further explain in detail the technical problems, technical solutions and advantages solved by the present invention, and it should be understood that the above only is a specific embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Claims (10)
1. An isolated DC fan driving device is characterized in that: the fan power supply device comprises a fan power supply module, a controller, an isolation driving module and an isolation power supply module; wherein,
the fan power supply module is electrically connected with the fan and is suitable for providing a working power supply for the fan;
the controller is in signal connection with the isolation driving module and is suitable for outputting PWM signals to the isolation driving module;
the isolation driving module is in signal connection with the fan and is suitable for performing photoelectric isolation on the PWM signal to generate a driving signal and sending the driving signal to the fan to control the rotating speed of the fan;
the isolation power supply module is electrically connected with the external power supply, the isolation driving module and the controller respectively and is suitable for isolating and converting the external power supply to generate a power supply required by the isolation power supply module and the controller.
2. The isolated dc fan drive of claim 1, wherein: the fan power supply module comprises a slow start functional circuit and an overload protection functional circuit.
3. The isolated dc fan drive of claim 2, wherein: the slow start function circuit comprises a resistor R1, a resistor R2, a capacitor C1, a capacitor C2, a diode D1 and a MOS transistor Q1; wherein,
the positive end of the external power supply is connected with the input end U1 of the slow start functional circuit, and the negative end of the external power supply is connected with the signal ground GND1 of the slow start functional circuit;
the input end U1 is connected to the source of the MOS transistor Q1, and the signal ground GND1 is connected to one end of the resistor R2;
one end of a parallel circuit formed by connecting a resistor R1, a capacitor C1 and a diode D1 in parallel is connected to the source electrode of the MOS transistor Q1, and the other end of the parallel circuit is connected to the other end of the resistor R2 and the grid electrode of the MOS transistor Q1 respectively;
the capacitor C2 is connected across the gate and the drain of the MOS transistor Q1.
4. The isolated dc fan drive of claim 3, wherein: the other end of a parallel circuit formed by connecting a resistor R1, a capacitor C1 and a diode D1 in parallel is connected with the gate of a MOS transistor Q1 through a resistor R3, and a capacitor C2 is connected with the gate of a MOS transistor Q1 through a resistor R4.
5. The isolated dc fan drive of claim 4, wherein: the overload protection function circuit comprises a resistor R5, a resistor R6, a resistor R7, a capacitor C6, a triode Q2 and a triode Q3; wherein,
the input end U2 of the overload protection functional circuit is connected to the output end of the slow start functional circuit, and the signal ground GND1 of the overload protection functional circuit and the signal ground GND1 of the slow start functional circuit are connected together in common;
the emitter of the triode Q2 is connected with the input end U2, the base of the triode Q2 is connected with one end of the resistor R6, the collector of the triode Q2 is respectively connected with the base of the triode Q3 and one end of the resistor R5, the emitter of the triode Q3 is connected with the input end U2, and the collector of the triode Q3 serving as the output end U3 of the overload protection function circuit is respectively connected with the other end of the resistor R6, one end of the resistor R7 and one end of the capacitor C6;
the other end of the resistor R5, the other end of the resistor R7, and the other end of the capacitor C6 are connected to a signal ground GND1, respectively.
6. The isolated dc fan drive of claim 5, wherein: the overload protection function circuit further comprises a capacitor C3, one end of a capacitor C3 is connected to the input end U2, and the other end of the capacitor C3 is connected to a signal ground GND 1.
7. The isolated dc fan drive of claim 6, wherein: the overload protection function circuit further comprises a capacitor C4 and a capacitor C5, wherein the capacitor C4 is connected between the base electrode and the collector electrode of the transistor Q2 in a bridging mode, and the capacitor C5 is connected between the base electrode and the collector electrode of the transistor Q3 in a bridging mode.
8. The isolated dc fan drive of claim 1, wherein: the isolation driving module comprises a resistor R8, a resistor R9, a resistor R10, a diode D3, a triode Q4 and an optical coupler Q5; wherein,
the input end U5 of the isolation driving module is connected to the positive end of an external power supply, and the signal ground GND1 of the isolation driving module is connected to the negative end of the external power supply;
the output end PWM _ IN of the controller is connected to one end of the resistor R10;
the base electrode of the triode Q4 is connected to the other end of the resistor R10, the collector electrode is connected to the low end of the input side of the optocoupler Q5, and the emitter electrode is connected to a signal ground GND 2;
one end of the resistor R8 is connected to the power input end U4, and the other end is connected to the high end of the input side of the optocoupler Q5;
the high end of the output side of the optical coupler Q5 is used as a driving signal output end PWM _ OUT and connected to the control signal input end of the fan, the high end of the output side of the optical coupler Q5 is also connected to the input end U5 of the isolation driving module through a resistor R9, and the low end of the output side of the optical coupler Q5 is connected to the signal ground GND1 of the isolation driving module;
a diode D3 is connected in reverse across the output of the optocoupler Q5.
9. The isolated dc fan drive of claim 8, wherein: and a capacitor C7 is connected between the output end PWM _ IN of the controller and the resistor R10 IN series.
10. The isolated dc fan drive of claim 9, wherein: the isolation driving module further comprises a diode D2 and a resistor R11, the cathode of the diode D2 is connected with the capacitor C7, the anode of the diode D2 is connected with one end of the resistor R11, and the other end of the resistor R11 is connected with the signal ground GND 2.
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|---|---|---|---|
| CN201920711898.1U CN209976847U (en) | 2019-05-17 | 2019-05-17 | Isolated DC fan driving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920711898.1U CN209976847U (en) | 2019-05-17 | 2019-05-17 | Isolated DC fan driving device |
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| CN209976847U true CN209976847U (en) | 2020-01-21 |
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| CN201920711898.1U Active CN209976847U (en) | 2019-05-17 | 2019-05-17 | Isolated DC fan driving device |
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