CN108757540B - Fan starting circuit and electrical equipment - Google Patents
Fan starting circuit and electrical equipment Download PDFInfo
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- CN108757540B CN108757540B CN201810794572.XA CN201810794572A CN108757540B CN 108757540 B CN108757540 B CN 108757540B CN 201810794572 A CN201810794572 A CN 201810794572A CN 108757540 B CN108757540 B CN 108757540B
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Classifications
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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
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Abstract
The application relates to a fan starting circuit and electrical equipment. The circuit comprises: the first resistor, the second resistor, the switch tube and the third resistor; one of the first resistor and the second resistor is a thermistor; the first end of the first resistor is connected with a common terminal power supply; the first resistor is connected with the second resistor and the switch tube respectively; the second end of the second resistor is grounded; the second end of the switching tube is connected with the common end power supply, the third end of the switching tube is connected with the first end of the fan, and the second end of the switching tube is used for receiving the current of the common end power supply when the switching tube is in a conducting state and transmitting the current to the fan through the third end of the switching tube, and the fan is started; the first end of the third resistor is connected with a common end power supply, the second end of the third resistor is connected with the fan, and when the switch tube is in an off state, the common end power supply current is transmitted to the fan through the third resistor, and the fan is started. The circuit or the electrical equipment can avoid the problem that the fan is difficult to start in a low-temperature environment.
Description
Technical Field
The present application relates to the field of circuits, and in particular, to a fan starting circuit and an electrical apparatus.
Background
With the development of technology, more and more electrical equipment, particularly intelligent electrical equipment, is put into use. During the use of the electrical equipment, a fan is often required to assist the operation of the electrical equipment. As the demand for smart appliances increases, so too does the demand for fans. The fan is difficult to start under the low-temperature condition in the use process.
In the related art, a method of connecting a voltage stabilizing circuit with a controllable precise voltage stabilizing source (TL 431) in series is mostly adopted to solve the problem that a fan is difficult to start under the low-temperature condition. However, TL431 itself is costly, and the number of devices in the TL431 circuit is large, and the layout space is large, which results in a high cost of the TL431 circuit.
Disclosure of Invention
To overcome the problems in the related art to at least some extent, the present application provides a fan starting circuit and an electrical apparatus.
The scheme of the application is as follows:
A fan start-up circuit, comprising:
The first resistor, the second resistor, the switch tube and the third resistor; wherein one of the first resistor and the second resistor is a thermistor;
The first end of the first resistor is connected with a common terminal power supply;
The second end of the first resistor is connected with the first end of the second resistor and the first end of the switching tube respectively;
The second end of the second resistor is grounded;
the second end of the switching tube is connected with a common end power supply, the third end of the switching tube is connected with the first end of the fan, and the switching tube is used for being conducted under the action of a current signal transmitted by the first resistor;
The first end of the third resistor is connected with a common terminal power supply, the second end of the third resistor is connected with the first end of the fan, and the common terminal power supply current is transmitted to the fan through the third resistor when the switch tube is in an off state, and the fan is started.
Optionally, the first resistor is a thermistor; or the second resistor is a thermistor.
Optionally, the method further comprises:
The voltage control module is connected with the second end of the first resistor, and the second end of the voltage control module is connected with the first end of the switching tube and used for enabling voltage drop to be generated between the second end of the first resistor and the first end of the switching tube.
Optionally, the method further comprises:
the positive pole of the first diode is connected with the second end of the fan, and the negative pole of the first diode is connected with the first end of the fan and used for protecting the fan in a power-off state.
Optionally, the pressure control module is: the first end of the diode group is connected with the second end of the first resistor, and the second end of the diode group is connected with the first end of the switch tube.
Optionally, the voltage control module is a voltage stabilizing tube, a negative electrode of the voltage stabilizing tube is connected with the second end of the first resistor, and a positive electrode of the voltage stabilizing tube is connected with the first end of the switching tube.
Optionally, the diode group includes a set number of diodes, and each diode is connected in series in a forward direction.
Optionally, the diode group includes:
A second diode, a third diode, a fourth diode; the positive electrode of the second diode is connected with the second end of the first resistor and is used for receiving the current transmitted by the end of the first resistor; the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected with the first end of the switching tube.
Optionally, the switching tube is:
An NPN triode; the base of the NPN triode is a first end of the switching tube, the collector of the NPN triode is a second end of the switching tube, and the emitter of the NPN triode is a third end of the switching tube;
The base of the NPN triode is connected with the second end of the first resistor, the collector of the NPN triode is connected with a public end power supply, and the emitter of the NPN triode is connected with the first end of the fan.
Optionally, the switching tube is:
PNP type triode; the base of the PNP type triode is a first end of the switching tube, the emitter of the PNP type triode is a second end of the switching tube, and the collector of the PNP type triode is a third end of the switching tube;
The base of the PNP type triode is connected with the second end of the first resistor, the emitting electrode of the PNP type triode is connected with a common end power supply, and the collecting electrode of the PNP type triode is connected with the first end of the fan.
Optionally, the switching tube is:
A MOS tube; the gate of the MOS tube is a first end of the switch tube, the drain of the MOS tube is a second end of the switch tube, and the source of the MOS tube is a third end of the switch tube;
The grid electrode of the MOS tube is connected with the second end of the first resistor, the drain electrode of the MOS tube is connected with a public end power supply, and the source electrode of the MOS tube is connected with the first end of the fan.
A fan start-up circuit, comprising:
the first resistor, the second resistor, the switch tube and the third resistor;
The first end of the first resistor is connected with a common terminal power supply;
The second end of the first resistor is connected with the first end of the second resistor and the first end of the switching tube respectively;
The second end of the second resistor is grounded;
The second end of the switching tube is connected with the second end of the fan, the third end of the switching tube is grounded and is used for conducting the switching tube under the action of a current signal transmitted by the first resistor, and when the switching tube is in a conducting state, the second end of the switching tube receives the current transmitted by the fan and is grounded through the third end of the switching tube, so that the fan is started;
The first end of the third resistor is connected with the second end of the fan, the second end of the third resistor is grounded, and when the switch tube is in an off state, the common end power supply current passes through the fan, the third resistor and then is grounded, and the fan is started;
The first end of the fan is connected with a public end power supply.
Optionally, the method further comprises:
The voltage control module is connected with the second end of the first resistor, and the second end of the voltage control module is connected with the first end of the switching tube and used for enabling voltage drop to be generated between the second end of the first resistor and the first end of the switching tube.
Optionally, the method further comprises:
the positive pole of the first diode is connected with the second end of the fan, and the negative pole of the first diode is connected with the first end of the fan and used for protecting the fan in a power-off state.
Optionally, the pressure control module is: the first end of the diode group is connected with the second end of the first resistor, and the second end of the diode group is connected with the first end of the switch tube.
Optionally, the voltage control module is a voltage stabilizing tube, a negative electrode of the voltage stabilizing tube is connected with the second end of the first resistor, and a positive electrode of the voltage stabilizing tube is connected with the first end of the switching tube.
Optionally, the diode group includes a set number of diodes, and each diode is connected in series in a forward direction.
Optionally, the switching tube is:
An NPN triode; the base of the NPN triode is a first end of the switching tube, the collector of the NPN triode is a second end of the switching tube, and the emitter of the NPN triode is a third end of the switching tube;
The base of the NPN triode is connected with the second end of the first resistor, the collector of the NPN triode is connected with the second end of the fan, and the emitter of the NPN triode is grounded.
Optionally, the switching tube is:
PNP type triode; the base of the PNP type triode is a first end of the switching tube, the emitter of the PNP type triode is a second end of the switching tube, and the collector of the PNP type triode is a third end of the switching tube;
The base of the PNP type triode is connected with the second end of the first resistor, the emitter of the PNP type triode is connected with the second end of the fan, and the collector of the PNP type triode is grounded.
Optionally, the switching tube is:
A MOS tube; the gate of the MOS tube is a first end of the switch tube, the drain of the MOS tube is a second end of the switch tube, and the source of the MOS tube is a third end of the switch tube;
the grid electrode of the MOS tube is connected with the second end of the first resistor, the drain electrode of the MOS tube is connected with the second end of the fan, and the source electrode of the MOS tube is grounded.
An electrical device comprising a fan, a fan start circuit as described above electrically connected to the fan.
The technical scheme provided by the application can comprise the following beneficial effects:
The application discloses a fan starting circuit and an electrical device, wherein the circuit comprises: the first resistor, the second resistor, the switch tube and the third resistor; wherein one of the first resistor and the second resistor is a thermistor; the first end of the first resistor is connected with the common terminal power supply and is used for receiving a current signal of the common terminal power supply; the second end of the first resistor is respectively connected with the first end of the second resistor and the first end of the switching tube, and is used for presenting different resistance values along with the change of the ambient temperature; the second end of the second resistor is grounded and used for controlling the voltage divided by the two ends of the first resistor; the second end of the switching tube is connected with a power supply of the public end, the third end of the switching tube is connected with the first end of the fan and is used for conducting the switching tube under the action of a current signal transmitted by the first resistor, and when the switching tube is in a conducting state, the second end of the switching tube receives the current of the power supply of the public end and transmits the current to the fan through the third end of the switching tube, and the fan is started; the first end of the third resistor is connected with the common end power supply, the second end of the third resistor is connected with the first end of the fan, and the common end power supply current is transmitted to the fan through the third resistor when the switching tube is in an off state, and the fan is started. According to the application, through the attribute that the resistance value of the first resistor changes along with the temperature change, the voltage division of the second resistor can be controlled, so that the opening of the fan is controlled. When the first resistor is a thermistor, the resistance value of the first resistor is reduced along with the increase of the ambient temperature, the partial pressure of the first resistor is reduced, the partial pressure of the second resistor is increased, the current received by the first end of the switching tube can enable the switching tube to be closed, and the switching tube is communicated with the fan at the moment to start the fan. When the ambient temperature is lower, the resistance value of the first resistor is increased, the voltage at two ends of the second resistor is reduced, the current at the first end of the switch tube is insufficient to enable the switch tube to be conducted, and the common-end power supply circuit flows into the fan through the third resistor, so that the fan is started, and the effect of starting the fan in a low-temperature environment is achieved. Similarly, when the second resistor is a thermistor, the resistance of the thermistor becomes larger along with the temperature rise, and the resistance of the thermistor changes to cause the change of partial pressure, so that the function of starting the fan in a low-temperature environment is realized. According to the application, the fan is connected with the third resistor, and meanwhile, the third resistor is connected with the switch tube in parallel, so that the fan can be started in a low-temperature environment only through one resistor, the cost of a fan starting circuit is greatly reduced, and the expenditure is saved.
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 as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a schematic diagram of a fan start circuit according to an exemplary embodiment;
fig. 2 is a schematic diagram showing a structure of a fan start circuit according to another exemplary embodiment;
fig. 3 is a schematic diagram of a fan start circuit according to another exemplary embodiment;
Fig. 4 is a schematic diagram showing a structure of a fan start circuit according to another exemplary embodiment;
fig. 5 is a schematic diagram showing a structure of a fan start circuit according to another exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
Fig. 1 is a schematic diagram showing a structure of a fan start circuit according to an exemplary embodiment. Referring to fig. 1, a fan start-up circuit includes:
a first resistor 101, a second resistor 102, a switching tube 103 and a third resistor 104; wherein one of the first resistor and the second resistor is a thermistor;
A first end of the first resistor 101 is connected to a common terminal power supply and is used for receiving a current signal of the common terminal power supply;
the second end of the first resistor 101 is connected with the first end of the second resistor 102 and the first end of the switch tube 103 respectively, and is used for presenting different resistance values along with the change of the ambient temperature;
The second end of the second resistor 102 is grounded, and is used for controlling the voltage divided across the first resistor 101;
The second end of the switch tube 103 is connected with a common terminal power supply, the third end of the switch tube 103 is connected with the first end of the fan 105, and is used for conducting the switch tube under the action of a current signal transmitted by the first resistor 101, and when the switch tube is in a conducting state, the second end of the switch tube receives the current of the common terminal power supply and transmits the current to the fan 105 through the third end of the switch tube, and the fan 105 is started;
the first end of the third resistor 104 is connected to a common terminal power supply, and the second end of the third resistor 104 is connected to the first end of the fan 105, so that when the switch tube is in an off state, the common terminal power supply current is transmitted to the fan 105 through the third resistor, and the fan 105 is started.
One of the first resistor 101 and the second resistor 102 is a thermistor.
It should be noted that when the first resistor is a thermistor, the resistance of the thermistor becomes smaller as the temperature becomes larger, and when the second resistor is a thermistor, the resistance of the thermistor becomes larger as the temperature becomes larger.
When the first resistor 101 is a thermistor, the resistance of the thermistor is small and the partial pressure of the thermistor is small when the ambient temperature is high, and at the moment, the switching tube is conducted, so that the fan is started; when the ambient temperature is low, the thermistor resistance is large, the voltage division is also large, the switching tube cannot be conducted at the moment, and the common-end power supply current is transmitted to the fan through the third resistor, so that the fan is started at low temperature.
When the second resistor is a thermistor, the resistance value of the thermistor is increased when the ambient temperature is high, the voltage division of the thermistor is also increased, and the switching tube can be conducted at the moment, so that the fan can be started; when the ambient temperature is low, the resistance of the thermistor is reduced, the switching tube cannot be conducted, and at the moment, the common-end power supply current is transmitted to the fan through the third resistor, so that the fan is started at low temperature.
The switching tube may be: NPN triode or MOS tube;
When the switching tube is an NPN triode, the base of the NPN triode is the first end of the switching tube, the collector of the NPN triode is the second end of the switching tube, and the emitter of the NPN triode is the third end of the switching tube;
The base of the NPN triode is connected with the second end of the first resistor, the collector of the NPN triode is connected with a public end power supply, and the emitter of the NPN triode is connected with the first end of the fan.
When the switching tube is a PNP type triode, the base electrode of the PNP type triode is a first end of the switching tube, the emitting electrode of the PNP type triode is a second end of the switching tube, and the collector electrode of the PNP type triode is a third end of the switching tube;
The base of the PNP transistor is connected to the second end of the voltage control module 303, the emitter of the PNP transistor is connected to the common power supply, and the collector of the PNP transistor is connected to the first end of the fan 306.
When the switching tube is a MOS tube, the gate of the MOS tube is a first end of the switching tube, the drain of the MOS tube is a second end of the switching tube, and the source of the MOS tube is a third end of the switching tube;
The grid electrode of the MOS tube is connected with the second end of the first resistor, the drain electrode of the MOS tube is connected with a public end power supply, and the source electrode of the MOS tube is connected with the first end of the fan.
The fan starting circuit can control the partial pressure of the second resistor through the attribute that the resistance value of the first resistor changes along with the temperature change, so as to control the starting of the fan. When the ambient temperature is high, the resistance value of the first resistor is reduced, the partial pressure of the second resistor is increased, the current received by the first end of the switch tube can enable the switch tube to be closed, and the switch tube is communicated with the fan to start the fan. When the ambient temperature is lower, the resistance value of the first resistor is increased, the voltage at two ends of the second resistor is reduced, the current at the first end of the switch tube is insufficient to enable the switch tube to be conducted, and the common-end power supply circuit flows into the fan through the third resistor, so that the fan is started, and the effect of starting the fan in a low-temperature environment is achieved.
The first resistor is used as a thermistor to introduce a fan starting circuit:
Fig. 2 is a schematic diagram showing a structure of a fan start circuit according to another exemplary embodiment; referring to fig. 2, a fan start circuit includes:
A thermistor 201, a second resistor 202, a control voltage module 203, a switching tube 204, a third resistor 205 and a first diode 207;
A first end of the thermistor 201 is connected to a common terminal power supply and is used for receiving a current signal of the common terminal power supply;
the second end of the thermistor 201 is connected to the first end of the second resistor 202 and the first end of the voltage control module 203, respectively, so as to present different resistance values along with the change of the ambient temperature, when the ambient temperature is very low, the resistance value of the thermistor becomes large, and when the ambient temperature is very high, the resistance value of the thermistor becomes small.
The second end of the second resistor 202 is grounded, and is used for controlling the voltage divided across the thermistor 201; when the ambient temperature is lower, the resistance value of the thermistor becomes larger, and the voltage obtained at the two ends of the thermistor is larger at the moment, and when the ambient temperature is higher, the voltage obtained at the two ends of the thermistor is smaller.
The second end of the voltage control module 203 is connected to the first end of the switching tube 204, so as to generate a voltage drop between the second end of the thermistor 201 and the first end of the switching tube 204.
The second end of the switch tube 204 is connected to a common-end power supply, the third end of the switch tube 204 is connected to a first end of the fan 206, and is used for conducting the switch tube 204 under the action of a current signal transmitted by the voltage control module 203, when the switch tube 204 is in a conducting state, the second end of the switch tube 204 receives the current of the common-end power supply and transmits the current to the fan 206 through the third end of the switch tube 204, and the fan 206 is started;
the following description will now take the switching transistor 204 as an NPN transistor as an example: the base of the NPN triode is a first end of the switching tube, the collector of the NPN triode is a second end of the switching tube, and the emitter of the NPN triode is a third end of the switching tube;
the base of the NPN type triode is connected with the second end of the thermistor, the collector of the NPN type triode is connected with a public end power supply, and the emitter of the NPN type triode is connected with the first end of the fan.
The first end of the third resistor 205 is connected to a common terminal power supply, and the second end of the third resistor 205 is connected to the first end of the fan 206, so that when the switch tube 204 is in an off state, the current of the common terminal power supply is transmitted to the fan through the third resistor 205, and the fan 206 is started.
The anode of the first diode 207 is connected to the second end of the fan 206, and the cathode of the first diode 207 is connected to the first end of the fan 206, so as to protect the fan 206 in the power-off state.
The voltage control module 203 may be: the diode group is a voltage regulator tube. In the case of a diode group, a first end of the diode group is connected to a second end of the thermistor 201, and a second end of the diode group is connected to a first end of the switching tube 204.
When the voltage control module 203 is a voltage stabilizing tube, the negative electrode of the voltage stabilizing tube is connected with the second end of the thermistor 201, and the positive electrode of the voltage stabilizing tube is connected with the first end of the switching tube 204.
The diode group comprises a set number of diodes, and the diodes are connected in series in the forward direction. Taking 3 diodes as an example, the description will be made of a diode group:
The diode group includes: a second diode, a third diode, a fourth diode; the positive electrode of the second diode is connected with the second end of the thermistor and is used for receiving the current transmitted by the thermistor end; the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected with the first end of the switching tube.
The fan starting circuit connects the fan and the third resistor in series, meanwhile, the third resistor is connected with the triode in parallel, when the ambient temperature is lower, the triode is not conducted, the voltage of the fan during starting is reduced by utilizing the voltage division of the third resistor, the voltage reduction can lead to the reduction of the starting power of the fan, and then the fan is started. When the ambient temperature is higher, the voltage division of the thermistor is smaller, the triode is conducted at the moment, the third resistor is short-circuited, and the fan is normally started at the moment. The circuit can ensure that the fan can still be started in a low-temperature environment. On the basis, the voltage control module and the first diode are further added in the circuit, wherein voltage drop can be generated between the second end of the thermistor and the first end of the switch tube through the voltage control module, and the fan in the power-off state can be protected by the first diode, so that the circuit is capable of protecting the fan starting circuit on the basis of solving the problem that the fan is difficult to start in a low-temperature environment, and the precision and the safety of the fan starting circuit are improved.
The fan starting circuit is described in detail by taking a switching tube as a PNP triode and a first resistor as a thermistor: fig. 3 is a schematic diagram showing a structure of a fan start circuit according to another exemplary embodiment. Referring to fig. 3, a fan start circuit includes:
a thermistor 301, a second resistor 302, a control module 303, a switching tube 304, a third resistor 305, and a first diode 307;
The first end of the thermistor 301 is connected to a common terminal power supply, and is configured to receive a current signal of the common terminal power supply;
the second end of the thermistor 301 is connected to the first end of the second resistor 302 and the first end of the voltage control module 303, so as to present different resistance values along with the change of the ambient temperature, when the ambient temperature is very low, the resistance value of the thermistor becomes large, and when the ambient temperature is very high, the resistance value of the thermistor becomes small.
The second end of the second resistor 302 is grounded, and is used for controlling the voltage divided across the thermistor 301; when the ambient temperature is lower, the resistance value of the thermistor becomes larger, and the voltage obtained at the two ends of the thermistor is larger at the moment, and when the ambient temperature is higher, the voltage obtained at the two ends of the thermistor is smaller.
The second end of the voltage control module 303 is connected to the first end of the switching tube 304, so as to generate a voltage drop between the second end of the thermistor 301 and the first end of the switching tube 304.
The second end of the switch tube 304 is connected to a common-end power supply, the third end of the switch tube 304 is connected to a first end of the fan 306, and is used for conducting the switch tube 304 under the action of a current signal transmitted by the voltage control module 303, when the switch tube 304 is in a conducting state, the second end of the switch tube 304 receives the current of the common-end power supply and transmits the current to the fan 206 through the third end of the switch tube 304, and the fan 306 is started;
The switching transistor 304 is now exemplified as a PNP transistor: the base of the PNP type triode is a first end of the switching tube, the emitter of the PNP type triode is a second end of the switching tube, and the collector of the PNP type triode is a third end of the switching tube;
The base of the PNP transistor is connected to the second end of the voltage control module 303, the emitter of the PNP transistor is connected to the common power supply, and the collector of the PNP transistor is connected to the first end of the fan 306.
The first end of the third resistor 305 is connected to a common terminal power supply, and the second end of the third resistor 305 is connected to the first end of the fan 306, so that when the PNP transistor is in an off state, the current of the common terminal power supply is transmitted to the fan through the third resistor 305, and the fan 306 is started.
The anode of the first diode 307 is connected to the second end of the fan 306, and the cathode of the first diode 307 is connected to the first end of the fan 306, so as to protect the fan 306 in the power-off state.
The voltage control module 303 may be: the diode group is a voltage regulator tube. In the case of a diode group, a first end of the diode group is connected to a second end of the thermistor 301, and a second end of the diode group is connected to a first end of the PNP transistor.
When the voltage control module 303 is a voltage regulator, the negative electrode of the voltage regulator is connected to the second end of the thermistor 301, and the positive electrode of the voltage regulator is connected to the first end of the PNP transistor.
The diode group comprises a set number of diodes, and the diodes are connected in series in the forward direction. Taking 3 diodes as an example, the description will be made of a diode group:
The diode group includes: a second diode, a third diode, a fourth diode; the positive electrode of the second diode is connected with the second end of the thermistor and is used for receiving the current transmitted by the thermistor end; the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected with the base electrode of the PNP triode.
The fan starting circuit connects the fan and the third resistor in series, meanwhile, the third resistor is connected with the triode in parallel, when the ambient temperature is lower, the triode is not conducted, the voltage of the fan during starting is reduced by utilizing the voltage division of the third resistor, the voltage reduction can lead to the reduction of the starting power of the fan, and then the fan is started. When the ambient temperature is higher, the voltage division of the thermistor is smaller, the triode is conducted at the moment, the third resistor is short-circuited, and the fan is normally started at the moment. The circuit can ensure that the fan can still be started in a low-temperature environment. On the basis, the voltage control module and the first diode are further added in the circuit, wherein voltage drop can be generated between the second end of the thermistor and the first end of the switch tube through the voltage control module, and the fan in the power-off state can be protected by the first diode, so that the circuit is capable of protecting the fan starting circuit on the basis of solving the problem that the fan is difficult to start in a low-temperature environment, and the precision and the safety of the fan starting circuit are improved.
Wherein, the switching tube may further be: a MOS tube; the gate of the MOS tube is a first end of the switch tube, the drain of the MOS tube is a second end of the switch tube, and the source of the MOS tube is a third end of the switch tube;
The grid of the MOS tube is connected with the second end of the thermistor, the drain electrode of the MOS tube is connected with a public end power supply, and the source electrode of the MOS tube is connected with the first end of the fan.
Fig. 4 is a schematic diagram showing a structure of a fan start circuit according to another exemplary embodiment. Referring to fig. 4, a fan start circuit includes:
A first resistor 401, a second resistor 402, a switching tube 403, and a third resistor 404; wherein one of the first resistor and the second resistor is a thermistor;
A first end of the first resistor 401 is connected with a common terminal power supply;
the second end of the first resistor 401 is connected with the first end of the second resistor 402 and the first end of the switch tube 403 respectively;
The second end of the second resistor 402 is grounded;
A second end of the switch tube 403 is connected to a second end of the fan 405, and a third end of the switch tube 403 is grounded, so that the switch tube 403 is turned on under the action of a current signal transmitted by the first resistor 401, and when the switch tube 403 is in a turned-on state, the second end of the switch tube 403 receives a current transmitted by the fan 405 and is grounded through the third end of the switch tube 403, so that the fan 405 is started;
The first end of the third resistor 404 is connected to the second end of the fan 405, and the second end of the third resistor 404 is grounded, so that when the switch tube 403 is in an off state, a common-end power supply current passes through the fan 405 and the third resistor 404 is grounded, and the fan 405 is started;
A first end of the fan 405 is connected to a common power source.
Wherein, the switching tube may be: NPN triode or PNP triode or MOS tube;
When the switching tube is an NPN triode, the base of the NPN triode is the first end of the switching tube, the collector of the NPN triode is the second end of the switching tube, and the emitter of the NPN triode is the third end of the switching tube;
The base of the NPN triode is connected with the second end of the first resistor, the collector of the NPN triode is connected with the second end of the fan, and the emitter of the NPN triode is grounded.
When the switching tube is a PNP type triode, the base of the PNP type triode is a first end of the switching tube, the emitter of the PNP type triode is a second end of the switching tube, and the collector of the PNP type triode is a third end of the switching tube;
The base of the PNP type triode is connected with the second end of the first resistor, the emitter of the PNP type triode is connected with the second end of the fan, and the collector of the PNP type triode is grounded.
When the switch tube is an MOS tube; the gate of the MOS tube is a first end of the switch tube, the drain of the MOS tube is a second end of the switch tube, and the source of the MOS tube is a third end of the switch tube;
the grid electrode of the MOS tube is connected with the second end of the first resistor, the drain electrode of the MOS tube is connected with the second end of the fan, and the source electrode of the MOS tube is grounded.
Wherein the first resistor is a thermistor; or the second resistor is a thermistor.
It should be noted that when the first resistor is a thermistor, the resistance of the thermistor becomes smaller as the temperature becomes larger, and when the second resistor is a thermistor, the resistance of the thermistor becomes larger as the temperature becomes larger.
When the first resistor is a thermistor, the resistance of the thermistor is small and the partial pressure of the thermistor is small when the ambient temperature is high, and at the moment, the switching tube is conducted, so that the fan is started; when the ambient temperature is low, the resistance value of the thermistor is large, the voltage division is also large, the switching tube cannot be conducted at the moment, and the common-end power supply current forms a passage through the fan and the third resistor, so that the fan is started at low temperature.
When the second resistor is a thermistor, the resistance value of the thermistor is increased when the ambient temperature is high, the voltage division of the thermistor is also increased, and the switching tube can be conducted at the moment, so that the fan can be started; when the ambient temperature is low, the resistance of the thermistor is reduced, the switching tube cannot be conducted, and at the moment, the common terminal power supply current forms a passage through the fan and the third resistor, so that the fan is started at low temperature.
The first resistor is used as a thermistor to introduce a fan starting circuit:
fig. 5 is a schematic diagram showing a structure of a fan start circuit according to another exemplary embodiment. Referring to fig. 5, a fan start circuit includes:
A thermistor 501, a second resistor 502, a control voltage module 503, a switching tube 504, a third resistor 505 and a first diode 506;
a first end of the thermistor 501 is connected with a common end power supply;
The second end of the thermistor 501 is connected with the first end of the second resistor 502 and the first end of the voltage control module 503 respectively;
the second end of the second resistor 502 is grounded;
the second end of the voltage control module 503 is connected to the first end of the switching tube 504, so as to generate a voltage drop between the second end of the thermistor 501 and the first end of the switching tube 504;
The second end of the switch tube 504 is connected to the second end of the fan 507, the third end of the switch tube 504 is grounded, and is used for conducting the switch tube 504 under the action of the current signal transmitted by the thermistor 501, when the switch tube 504 is in a conducting state, the second end of the switch tube 504 receives the current transmitted by the fan 507 and is grounded through the third end of the switch tube 504, and the fan 507 is started;
The switching tube is taken as an NPN triode for example for description: the base of the NPN triode is a first end of the switching tube, the collector of the NPN triode is a second end of the switching tube, and the emitter of the NPN triode is a third end of the switching tube;
The base of the NPN transistor is connected to the second end of the thermistor 501, the collector of the NPN transistor is connected to the second end of the fan 507, and the emitter of the NPN transistor is grounded.
The first end of the third resistor 505 is connected to the second end of the fan 507, and the second end of the third resistor 505 is grounded, so that when the switching tube 504 is in an off state, a common-end power supply current passes through the fan 507 and the third resistor 505 to be grounded, and the fan 507 is started;
The first end of the fan 507 is connected with a public end power supply;
The anode of the first diode 506 is connected to the second end of the fan, and the cathode of the first diode 506 is connected to the first end of the fan, so as to protect the fan in the power-off state.
Wherein, the accuse pressure module can be: diode groups or voltage regulator tubes. In the case of a diode group, a first end of the diode group is connected with a second end of the thermistor, and a second end of the diode group is connected with a first end of the switching tube.
The voltage control module is a voltage stabilizing tube, the negative electrode of the voltage stabilizing tube is connected with the second end of the thermistor, and the positive electrode of the voltage stabilizing tube is connected with the first end of the switching tube.
The diode group comprises a set number of diodes, and the diodes are connected in series in the forward direction. Taking 3 diodes as an example, the description will be made of a diode group:
The diode group includes: a second diode, a third diode, a fourth diode; the positive electrode of the second diode is connected with the second end of the thermistor and is used for receiving the current transmitted by the thermistor end; the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected with the base electrode of the NPN triode.
The fan starting circuit connects the fan and the third resistor in series, meanwhile, the third resistor is connected with the triode in parallel, when the ambient temperature is lower, the triode is not conducted, the voltage of the fan during starting is reduced by utilizing the voltage division of the third resistor, the voltage reduction can lead to the reduction of the starting power of the fan, and then the fan is started. When the ambient temperature is higher, the voltage division of the thermistor is smaller, the triode is conducted at the moment, the third resistor is short-circuited, and the fan is normally started at the moment. The circuit can ensure that the fan can still be started in a low-temperature environment. On the basis, the voltage control module and the first diode are further added in the circuit, wherein voltage drop can be generated between the second end of the thermistor and the first end of the switch tube through the voltage control module, and the fan in the power-off state can be protected by the first diode, so that the circuit is capable of protecting the fan starting circuit on the basis of solving the problem that the fan is difficult to start in a low-temperature environment, and the precision and the safety of the fan starting circuit are improved.
Wherein, the switching tube may further be: PNP triode or MOS tube;
When the switching tube is a PNP type triode, the base electrode of the PNP type triode is a first end of the switching tube, the emitting electrode of the PNP type triode is a second end of the switching tube, and the collector electrode of the PNP type triode is a third end of the switching tube;
The base of the PNP type triode is connected with the second end of the thermistor, the emitter of the PNP type triode is connected with the second end of the fan, and the collector of the PNP type triode is grounded.
When the switching tube is a MOS tube, the gate of the MOS tube is a first end of the switching tube, the drain of the MOS tube is a second end of the switching tube, and the source of the MOS tube is a third end of the switching tube;
the grid of the MOS tube is connected with the second end of the thermistor, the drain electrode of the MOS tube is connected with the second end of the fan, and the source electrode of the MOS tube is grounded.
The application also provides an electrical device comprising a fan, and the fan starting circuit electrically connected with the fan.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (13)
1. A fan start-up circuit, comprising:
the switching tube comprises a first resistor, a second resistor, a switching tube, a third resistor and a voltage control module; wherein one of the first resistor and the second resistor is a thermistor;
The first end of the first resistor is connected with a common terminal power supply;
The second end of the first resistor is connected with the first end of the second resistor and the first end of the switching tube respectively;
The second end of the second resistor is grounded;
The second end of the switching tube is connected with a public end power supply, the third end of the switching tube is connected with the first end of the fan, the switching tube is conducted under the action of a current signal transmitted by the first resistor, so that the switching tube is in a conducting state in a high-temperature environment, the second end of the switching tube receives the current of the public end power supply and transmits the current to the fan through the third end of the switching tube, and the fan is started;
The first end of the third resistor is connected with a common terminal power supply, the second end of the third resistor is connected with the first end of the fan, and the common terminal power supply current is transmitted to the fan through the third resistor when the switching tube is in an off state in a low-temperature environment, and the fan is started;
The control module is used for generating voltage drop between the second end of the first resistor and the first end of the switch tube, and comprises: a diode group; the diode group includes: a second diode, a third diode, a fourth diode; the positive electrode of the second diode is connected with the second end of the first resistor and is used for receiving the current transmitted by the end of the first resistor; the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected with the first end of the switching tube.
2. The fan start-up circuit of claim 1, further comprising:
the positive pole of the first diode is connected with the second end of the fan, and the negative pole of the first diode is connected with the first end of the fan and used for protecting the fan in a power-off state.
3. The fan starting circuit of claim 2 wherein the set of diodes includes a set number of diodes, each of the diodes being connected in series in a forward direction.
4. The fan start-up circuit of claim 1, wherein the switching tube is:
An NPN triode; the base of the NPN triode is a first end of the switching tube, the collector of the NPN triode is a second end of the switching tube, and the emitter of the NPN triode is a third end of the switching tube; the base of the NPN triode is connected with the second end of the first resistor, the collector of the NPN triode is connected with a public end power supply, and the emitter of the NPN triode is connected with the first end of the fan.
5. The fan start-up circuit of claim 1, wherein the switching tube is:
PNP type triode; the base of the PNP type triode is a first end of the switching tube, the emitter of the PNP type triode is a second end of the switching tube, and the collector of the PNP type triode is a third end of the switching tube; the base of the PNP type triode is connected with the second end of the first resistor, the emitting electrode of the PNP type triode is connected with a common end power supply, and the collecting electrode of the PNP type triode is connected with the first end of the fan.
6. The fan start-up circuit of claim 1, wherein the switching tube is: a MOS tube; the gate of the MOS tube is a first end of the switch tube, the drain of the MOS tube is a second end of the switch tube, and the source of the MOS tube is a third end of the switch tube; the grid electrode of the MOS tube is connected with the second end of the first resistor, the drain electrode of the MOS tube is connected with a public end power supply, and the source electrode of the MOS tube is connected with the first end of the fan.
7. A fan start-up circuit, comprising:
the switching tube comprises a first resistor, a second resistor, a switching tube, a third resistor and a voltage control module; wherein one of the first resistor and the second resistor is a thermistor;
The first end of the first resistor is connected with a common terminal power supply;
The second end of the first resistor is connected with the first end of the second resistor and the first end of the switching tube respectively;
The second end of the second resistor is grounded;
The second end of the switching tube is connected with the second end of the fan, the third end of the switching tube is grounded and is used for conducting the switching tube under the action of a current signal transmitted by the first resistor, so that when the switching tube is in a conducting state in a high-temperature environment, the second end of the switching tube receives the current transmitted by the fan and is grounded through the third end of the switching tube, and the fan is started; the first end of the third resistor is connected with the second end of the fan, the second end of the third resistor is grounded, and when the switch tube is in an off state in a low-temperature environment, the common-end power supply current passes through the fan, the third resistor and then is grounded, and the fan is started;
The first end of the fan is connected with a public end power supply;
The control module is used for generating voltage drop between the second end of the first resistor and the first end of the switch tube, and comprises: a diode group; the diode group includes: a second diode, a third diode, a fourth diode; the positive electrode of the second diode is connected with the second end of the first resistor and is used for receiving the current transmitted by the end of the first resistor; the negative electrode of the second diode is connected with the positive electrode of the third diode, the negative electrode of the third diode is connected with the positive electrode of the fourth diode, and the negative electrode of the fourth diode is connected with the first end of the switching tube.
8. The fan start-up circuit of claim 7, further comprising:
the positive pole of the first diode is connected with the second end of the fan, and the negative pole of the first diode is connected with the first end of the fan and used for protecting the fan in a power-off state.
9. The fan start-up circuit of claim 7, wherein the set of diodes includes a set number of diodes, each of the diodes being connected in series in a forward direction.
10. The fan start-up circuit of claim 7, wherein the switching tube is:
An NPN triode; the base of the NPN triode is a first end of the switching tube, the collector of the NPN triode is a second end of the switching tube, and the emitter of the NPN triode is a third end of the switching tube;
The base of the NPN triode is connected with the second end of the first resistor, the collector of the NPN triode is connected with the second end of the fan, and the emitter of the NPN triode is grounded.
11. The fan start-up circuit of claim 7, wherein the switching tube is:
PNP type triode; the base of the PNP type triode is a first end of the switching tube, the emitter of the PNP type triode is a second end of the switching tube, and the collector of the PNP type triode is a third end of the switching tube;
The base of the PNP type triode is connected with the second end of the first resistor, the emitter of the PNP type triode is connected with the second end of the fan, and the collector of the PNP type triode is grounded.
12. The fan start-up circuit of claim 7, wherein the switching tube is:
A MOS tube; the gate of the MOS tube is a first end of the switch tube, the drain of the MOS tube is a second end of the switch tube, and the source of the MOS tube is a third end of the switch tube; the grid electrode of the MOS tube is connected with the second end of the first resistor, the drain electrode of the MOS tube is connected with the second end of the fan, and the source electrode of the MOS tube is grounded.
13. An electrical device comprising a fan, a fan start circuit according to any one of claims 1 to 12 electrically connected to the fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810794572.XA CN108757540B (en) | 2018-07-19 | 2018-07-19 | Fan starting circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810794572.XA CN108757540B (en) | 2018-07-19 | 2018-07-19 | Fan starting circuit and electrical equipment |
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| CN108757540B true CN108757540B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06189586A (en) * | 1992-10-15 | 1994-07-08 | Oki Electric Ind Co Ltd | Control method for cooling fan and circuit used for it |
| CN1949119A (en) * | 2005-10-11 | 2007-04-18 | 华硕电脑股份有限公司 | Fan system and method with circuit magnetic hysteresis feature |
| CN201716662U (en) * | 2010-07-15 | 2011-01-19 | 曾震 | Mute and energy-saving power source for computers |
| CN105351238A (en) * | 2015-12-09 | 2016-02-24 | 周芸 | Gas water heater and exhaust fan synchronous-working device |
| CN208950940U (en) * | 2018-07-19 | 2019-06-07 | 珠海格力电器股份有限公司 | Fan starting circuit and electrical equipment |
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2018
- 2018-07-19 CN CN201810794572.XA patent/CN108757540B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06189586A (en) * | 1992-10-15 | 1994-07-08 | Oki Electric Ind Co Ltd | Control method for cooling fan and circuit used for it |
| CN1949119A (en) * | 2005-10-11 | 2007-04-18 | 华硕电脑股份有限公司 | Fan system and method with circuit magnetic hysteresis feature |
| CN201716662U (en) * | 2010-07-15 | 2011-01-19 | 曾震 | Mute and energy-saving power source for computers |
| CN105351238A (en) * | 2015-12-09 | 2016-02-24 | 周芸 | Gas water heater and exhaust fan synchronous-working device |
| CN208950940U (en) * | 2018-07-19 | 2019-06-07 | 珠海格力电器股份有限公司 | Fan starting circuit and electrical equipment |
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| CN108757540A (en) | 2018-11-06 |
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