CN212774886U - Fan detection circuit and heating equipment - Google Patents
Fan detection circuit and heating equipment Download PDFInfo
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- CN212774886U CN212774886U CN202021553506.2U CN202021553506U CN212774886U CN 212774886 U CN212774886 U CN 212774886U CN 202021553506 U CN202021553506 U CN 202021553506U CN 212774886 U CN212774886 U CN 212774886U
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Abstract
The utility model provides a fan detection circuitry and firing equipment, this fan detection circuitry includes: the device comprises a fan, a driving circuit, a control circuit and a detection circuit; the input end of the fan driving circuit is connected with a fan driving port of the control circuit, and the output end of the fan driving circuit is connected with the fan; the input end of the detection circuit is connected with the fan, and the output end of the detection circuit is connected with the sampling port of the control circuit; the detection circuit is used for detecting the voltage and/or the circuit of the fan and sending the detection result to the sampling port, and the control circuit is used for determining the working state of the fan according to the detection result of the sampling port receiving channel. The fan detection circuit detects the voltage and/or the circuit of the fan through the detection circuit, so that the working state of the fan is detected, and the safety of the heating equipment is improved.
Description
Technical Field
The utility model relates to a circuit technology especially relates to a fan detection circuitry and firing equipment.
Background
Heating devices, such as induction cookers, and the like, are devices that convert electrical energy into thermal energy. Be provided with the fan among the firing equipment for when the fan rotated, the inside thermal giving off of firing equipment avoided the high temperature environment to cause the damage to the components and parts among the firing equipment.
The fan is usually driven by a control circuit and a fan driving circuit, the control circuit sends different driving signals to the fan driving circuit, and the fan control circuit is switched on or off when receiving the driving signals, so as to control the fan to rotate or stop rotating. However, the fan may malfunction, for example, an open circuit or a short circuit occurs, resulting in a reduction in the safety of the heating apparatus. Therefore, a fan detection circuit for detecting the operating state of a fan is needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a fan detection circuitry and firing equipment to the realization improves firing equipment's security to the operating condition's of fan detection.
In a first aspect, the present invention provides a fan detection circuit, including a fan, a fan driving circuit and a control circuit, wherein an input end of the fan driving circuit is connected to a fan driving port of the control circuit, an output end of the fan driving circuit is connected to the fan, the fan detection circuit further includes a detection circuit, the control circuit further includes a detection port, an input end of the detection circuit is connected to the fan, and an output end of the detection circuit is connected to the sampling port;
the detection circuit is used for detecting the voltage and/or the current of the fan and sending a detection result to the sampling port;
and the control circuit is used for determining the working state of the fan according to the detection result received by the sampling port.
The utility model discloses a detection circuitry detects the voltage and/or the electric current of fan, sends the testing result to control circuit's sampling port, carries out the analysis to the testing result by control circuit, obtains the operating condition of fan to based on the detection of detection circuitry to the voltage and/or the electric current of fan, realize the detection to the operating condition of fan, can also detect the operating condition's of fan change effectively, improved the accuracy that the operating condition of fan detected.
In a possible implementation manner, the detection circuit includes a first resistor, one side of the first resistor is connected to the fan and the sampling port, and the other side of the first resistor is grounded.
The utility model discloses well detection circuitry includes first resistance, and first resistance is as current detection resistance and/or voltage detection resistance, and one side is connected with fan and sampling port, and opposite side ground connection, consequently the sampling port can sample the voltage and/or the electric current that obtains the circuit at fan place, realizes the detection of detection circuitry to the voltage and/or the electric current of fan, and the hardware cost is lower.
In one possible implementation, an integrating circuit is connected between the first resistor and the sampling port.
The utility model discloses in set up integrating circuit between first resistance and the sampling port, carry out rectification filtering to the voltage and/or the electric current of gathering through integrating circuit to improve the detection effect of voltage and/or electric current.
In one possible implementation, the integrating circuit includes a current limiting circuit and a filtering circuit; the input end of the current limiting circuit is connected with one side, far away from the grounding, of the first resistor, and the output end of the current limiting circuit is connected with the sampling port; one side of the filter circuit is connected with the output end of the current limiting circuit, and the other side of the filter circuit is grounded.
In the utility model, the current flowing into the control circuit is limited by the current limiting circuit with one side connected with one side of the first resistor far from the grounding and the other side connected with the sampling port, so as to protect the control circuit; the detected voltage and/or current is rectified and filtered through the filter circuit with one side connected with the output end of the current limiting circuit and the other side grounded, so that the detection effect of the voltage and/or current is improved.
In one possible implementation, the current limiting circuit includes a second resistor, and the filter circuit includes a capacitor.
The utility model discloses well current-limiting circuit includes that second resistance, filter circuit include electric capacity to restrict the electric current size in the control circuit of flowing in through the second resistance, with protection control circuit, carry out rectification filtering to the voltage and/or the electric current that detect through electric capacity, with the detection effect who improves voltage and/or electric current.
In one possible implementation manner, the fan driving circuit further includes a switching circuit; the control circuit analyzes the detection result, if the voltage and/or the current of the fan are analyzed to be abnormal, a first level signal is sent to the switch circuit, the switch circuit is disconnected, the fan stops rotating, if the voltage and/or the circuit of the fan are analyzed to be normal, a second level signal is sent to the switch circuit, the switch circuit is connected, and the fan starts rotating.
The utility model discloses in send first level signal or second level signal to switch circuit through control circuit, control switch circuit disconnection or switch on, and then control fan drive circuit's disconnection or switch on. When the switch circuit is disconnected, the fan driving circuit is disconnected, and the fan stops rotating. When the switch circuit is switched on, the fan driving circuit is switched on, and the fan starts to rotate, so that the control circuit can control the fan to rotate or stop rotating according to whether the voltage and/or the current of the fan obtained after the detection result is analyzed to be abnormal or not, and the working safety of the fan is improved.
In a possible implementation manner, the switch circuit is connected between the detection circuit and the fan, when the switch circuit is turned on, the detection circuit is connected with the fan, and when the switch circuit is turned off, the detection circuit is disconnected with the fan.
The utility model discloses well switch circuit connects simultaneously between detection circuitry and fan, and consequently, when switch circuit switched on, the fan rotated, and detection circuitry detects the voltage and/or the electric current of fan simultaneously, and when switch circuit breaks off, the fan stall, and detection circuitry stops to the voltage and/or the electric current stop detection of fan simultaneously. Therefore, the timeliness and the accuracy of detecting the voltage and/or the current of the fan are improved.
In one possible implementation, the first pole of the switch circuit is connected to the fan, the second pole of the switch circuit is connected to the fan driving port of the control circuit, the third pole of the switch circuit is connected to the detection circuit, when the switch circuit is turned off, the first pole of the switch circuit is turned off from the third pole, and when the switch circuit is turned on, the first pole of the switch circuit is turned on from the third pole.
The utility model discloses fan, second pole connection control circuit's fan drive port, third pole connection detection circuitry are connected to well switch circuit's the first pole to when receiving the level signal (like first level signal or second level signal) that control circuit sent through fan drive port, switch circuit disconnection or switch on realize between fan drive circuit and the fan and the disconnection or switch on between fan and the detection circuitry.
In one possible implementation, the switching circuit is a triode.
In a second aspect, the present invention provides a heating device, comprising the fan detection circuit of the first aspect; and the heating equipment performs one or more operations of fan working state adjustment, heating state adjustment and prompt message output according to the working state of the fan detected by the fan detection circuit.
The utility model provides a fan detection circuitry and firing equipment, the detection circuitry who is connected through input and fan, output and control circuit's sampling port, detect the voltage and/or the electric current of fan, by the testing result of control circuit to the voltage and/or the electric current of fan, confirm the operating condition of fan. Therefore, the detection of the working state of the fan is realized, the hardware cost is low, the heating equipment can also perform corresponding operation according to the detected working state of the fan, and the safety of the heating equipment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a first schematic diagram of a fan detection circuit provided by the present invention;
fig. 2a is an exemplary graph of the change of the current of the wind turbine over time according to the present invention;
fig. 2b is an exemplary graph of the change of the current of the wind turbine over time according to the present invention;
fig. 2c is an exemplary graph of the voltage of the fan varying with time according to the present invention;
fig. 2d is an exemplary graph of the voltage of the wind turbine provided by the present invention as a function of time;
fig. 3 is a schematic diagram of a fan detection circuit according to the present invention;
fig. 4 is a third schematic diagram of a fan detection circuit provided by the present invention;
fig. 5 is a fourth schematic diagram of a fan detection circuit provided by the present invention;
fig. 6 is a fifth schematic diagram of a fan detection circuit provided by the present invention;
fig. 7 is a schematic diagram six of the fan detection circuit provided by the present invention.
Description of reference numerals:
10-a fan; 20-a fan drive circuit; 30-a control circuit; 40-a detection circuit; 50-an integrating circuit; 21-a switching circuit; 51-a current limiting circuit; 52-a filter circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The fan in the heating device is usually driven by a control circuit and a fan driving circuit, when the control circuit outputs a high level signal to the fan driving circuit, the fan driving circuit is switched on, the fan rotates, when the control circuit outputs a low level signal to the fan driving circuit, the fan driving circuit is switched off, and the fan stops rotating.
Above-mentioned scheme can realize that control circuit rotates and stall control to the fan, but can't detect the operating condition of fan, for example whether the fan short circuit, opens circuit, again like whether the rotational speed of fan is too fast or the rotational speed is too slow. The working state of the fan cannot be known, so that the safety of the heating equipment is reduced.
In order to solve the above problem, an embodiment of the present application provides a fan detection circuit and a heating device, including a fan, a fan driving circuit, a control circuit and a detection circuit, an input end of the fan driving circuit is connected with a fan driving port of the control circuit, an output end of the fan driving circuit is connected with the fan, an input end of the detection circuit is connected with the fan, and an output end of the detection circuit is connected with a sampling port of the control circuit. The detection of the voltage and/or the current of the fan is realized through the fan detection circuit, and the working state of the fan is determined by combining the detection results of the control circuit and the voltage and/or the circuit, so that the detection of the working state of the fan is realized. The heating equipment can determine the working state of the fan according to the fan detection circuit, so that the heating state is adjusted and/or corresponding reminding messages are output, and the safety of the heating equipment is improved.
The fan detection circuit and the heating device provided in the embodiments of the present application are described in detail below with reference to specific embodiments, it is understood that the following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a first schematic diagram of a fan detection circuit provided in an embodiment of the present application. As shown in fig. 1, the fan detection circuit includes a fan 10, a fan driving circuit 20, a control circuit 30, and a detection circuit 40.
The input end of the fan driving circuit 20 is connected to the fan driving port of the control circuit 30, and the output end of the fan driving circuit 20 is connected to the fan 10, so as to control the fan 10 to rotate when receiving the driving signal of the control circuit 30. The input end of the detection circuit 40 is connected with the fan 10, and the output end of the detection circuit 40 is connected with the sampling port of the control circuit 30, so as to detect the voltage and/or current of the fan 10 and send the detection result to the sampling port of the control circuit 30. The control circuit 30 determines the working state of the fan 10 according to the detection result received by the sampling port.
In this embodiment, the sampling port of the control circuit 30 can obtain a voltage value and/or a current value of the fan 10 changing with time based on the detection circuit 40, and determine the operating state of the fan 10 according to the voltage value and/or the current value of the fan 10 changing with time. The control circuit 30 may be a Micro Controller Unit (MCU) chip.
Taking fig. 2a to 2d as an example, fig. 2a and 2b show the current value of the fan 10 with time, the abscissa is time and the ordinate is the current value, and fig. 2c and 2d show the voltage value of the fan 10 with time, the abscissa is time and the ordinate is the voltage value. In fig. 2a, the current value rapidly decreases to 0, which indicates that the fan 10 is likely to be disconnected, that is, the operating state is the disconnected state; in fig. 2b, the current value suddenly rises and remains stable after rising, which indicates that the short circuit of the fan 10 is likely to occur, that is, the working state is a short circuit state; in fig. 2c, the voltage is kept constant, which indicates that the working state of the fan 10 is a normal state; the voltage value in fig. 2d fluctuates, indicating that the voltage of the wind turbine 10 is unstable and may be affected by the external grid voltage fluctuation. In addition, the rotation speed of the fan 10 may also be determined according to the magnitude of the voltage and/or the current, for example, when the voltage and/or the current exceeds a preset threshold, it is determined that the rotation speed of the fan 10 is faster. Accordingly, the control circuit 30 is capable of determining the operational state of the wind turbine 10 based on the voltage and/or current values of the wind turbine 10.
In a possible implementation manner, when determining that the working state of the fan 10 is abnormal, the control circuit 30 may send a corresponding driving signal to the fan driving circuit 20 through the fan driving port, and control the fan 10 to rotate or stop rotating, so as to improve the safety of the heating device where the fan 10, the fan detection circuit, and the fan detection circuit are located. The abnormal operating condition of the fan 10 includes an abnormal voltage and/or current of the fan 10. The voltage abnormality and the current abnormality can be represented by referring to the content shown in fig. 3, and are not described again.
The fan detection circuit provided by the embodiment is characterized in that the detection circuit 40 is connected between the fan 10 and the control circuit 30, the input end of the detection circuit 40 is connected with the fan 10, the output end of the detection circuit 40 is connected with the control circuit 30, the detection of the voltage and/or the current of the fan 10 is realized through the detection circuit 40 and the control circuit 30, the detection of the working state of the fan 10 is further realized, and the hardware cost is lower.
On the basis of the embodiment shown in fig. 1, the detection circuit 40 is explained with reference to a specific example.
Fig. 3 is a schematic structural diagram ii of a fan detection circuit provided in the embodiment of the present application. As shown in fig. 3, the blower detection circuit includes: the fan 10, the fan drive circuit 20, the control circuit 30 and the detection circuit 40. Wherein the detection circuit 40 includes a first resistor R1.
One side of the first resistor R1 is connected to the sampling ports of the fan 10 and the control circuit 30, and the other side is grounded. Therefore, when current flows through the fan 10, the first resistor R1 as a voltage measuring resistor and/or a circuit measuring resistor forms a loop with the fan 10, and the sampling port of the control circuit 30 can obtain the voltage and/or the current of the first resistor R1 on the side away from the ground, so as to obtain the voltage and/or the current of the fan 10.
Optionally, the resistance of the first resistor R1 is greater than or equal to 1 ohm and less than or equal to 10 ohms. For example, the normal operating current of the fan 10 is usually 200 milliamperes, the power supply connected to the fan 10 is 18 volts, since the first resistor R1 forms a series circuit with the fan 10, when the first resistor R1 is 1 ohm, the voltage of the first resistor R1 is 0.2 volts, the sampling port samples the voltage of the resistor R1 and determines the voltage of the fan 10 according to the voltage of the resistor R1, and the voltage of 0.2 volts is easily detected for the sampling port.
In a possible implementation manner, fig. 4 is a schematic structural diagram of a fan detection circuit provided in the embodiment of the present application, and as shown in fig. 4, an integrating circuit 50 is connected between the first resistor R1 and a sampling port of the control circuit 30, so as to perform rectification filtering on a voltage and/or a circuit through the integrating circuit 50, and improve an effect of the voltage and/or the current sampled by the sampling port.
In a possible implementation manner, fig. 5 is a schematic structural diagram of a fan detection circuit provided in an embodiment of the present application, and as shown in fig. 5, the integrating circuit 50 includes a current limiting circuit 51 and a filtering circuit 52. The input end of the current limiting circuit 51 is connected to the side of the first resistor R1 away from the ground, and the output end of the current limiting circuit 51 is connected to the sampling port of the control circuit 30, so as to prevent the current flowing into the sampling port of the control circuit 30 from being too large, thereby protecting the control circuit 30. One side of the filter circuit 52 is connected to the output end of the current limiting circuit 51, and the other side is grounded, so as to perform rectification filtering on the voltage and/or current at the sampling port, and improve the quality of the voltage value and/or current value acquired by the sampling port.
Optionally, as shown in fig. 5, the current limiting circuit 51 includes a second resistor R2, and the filter circuit 52 includes a capacitor C1. The second resistor R2 has a value of, for example, 1 kilo-ohm.
The blower detection circuit provided by the embodiment accesses the detection circuit 40 including the first resistor R1 between the blower 10 and the control circuit 30, one side of the first resistor R1 is connected with the sampling ports of the blower 10 and the control circuit 30, or one side of the first resistor R1 is connected with the blower 10 and is connected with the sampling port through the integrating circuit 50, and the other side of the first resistor R1 is grounded, so that the detection of the voltage and/or the current of the blower 10 is realized, the detection of the working state of the blower 10 is further realized, and the hardware cost is low.
On the basis of the fan detection circuit shown in any one of fig. 1 to 5, the fan 10, the fan driving circuit 20, and the detection circuit 40 will be further described with reference to specific examples.
Fig. 6 is a fifth structural schematic diagram of a fan detection circuit provided in the embodiment of the present application. The difference from the fan detection circuit shown in fig. 6 is that, in the fan detection circuit shown in fig. 6, the fan drive circuit 20 includes a switch circuit 21. The switch circuit 21 is connected between the detection circuit 40 and the fan 10. When the switch circuit 21 is turned on, the fan driving circuit 20 is turned on, and the detection circuit 40 is turned on with the fan 10, current flows through the fan 10 to start rotating, and a sampling port in the control circuit 30 collects voltage and/or current of the fan 10. When the switch circuit 21 is turned off, the fan driving circuit 20 is turned off, and the detection circuit 40 and the fan 10 are turned off, so that the fan 10 loses current and stops rotating, and the sampling port in the control circuit 30 stops collecting the voltage and/or current of the fan 10.
Wherein, the first pole of the switch circuit 21 is connected with the fan 10; the second pole of the switch circuit 21 is connected to the fan driving port of the control circuit 30, and is used for receiving a driving signal sent by the control circuit 30 through the fan driving port, and the switch circuit 21 is turned off or turned on according to the driving signal; the third pole of the switching circuit 21 is connected to the detection circuit 40. When the switch circuit 21 is turned off, the first pole and the third pole of the switch circuit 21 are disconnected, the fan 10 is disconnected from the detection circuit 40, and the fan 10 is in an open circuit state and cannot rotate. When the switching circuit 21 is turned on, the first pole and the third pole of the switching circuit 21 are turned on, the fan 10 is connected to the detection circuit 40, and the line in which the fan 10 is located is turned on to start rotating.
In a possible implementation manner, the control circuit 30 analyzes the detection result received by the sampling port, and if the operating state of the fan 10 is abnormal (including the voltage and/or current abnormality of the fan 10) through analysis, sends a first level signal to the switch circuit 21, and the switch circuit 21 is turned off when receiving the first level signal, so that the fan 10 stops rotating; if the operating state of the fan 10 is normal (including the voltage and/or the circuit of the fan 10 is normal) through analysis, a second level signal is sent to the switch circuit 21, the switch circuit 21 is turned on, and the fan 10 starts to rotate. Therefore, the control circuit 30 controls the rotation of the fan 10 according to the working state of the fan 10, and the safety of the fan 10, the fan detection circuit and the heating device where the fan detection circuit is located is improved. The first level signal is, for example, a low level signal, and the second level signal is, for example, a high level signal.
The fan detection circuit provided by the embodiment is connected to the switch circuit 21 in the fan driving circuit 20 between the fan 10 and the detection circuit 40, and controls the on/off of the fan driving circuit 20 and the on/off of the detection circuit 40 and the fan 10 through the switch circuit 21, so that the voltage and/or current of the fan 10 can be detected in time by the detection circuit 40, and the detection effect of the working state of the fan 10 is effectively improved.
The switching circuit 21 will be further described with reference to a specific example on the basis of the fan detection circuit shown in fig. 7.
Fig. 7 is a sixth schematic structural diagram of a fan detection circuit provided in an embodiment of the present application. The difference from the fan detection circuit shown in fig. 6 is that the switching circuit 21 of the fan detection circuit in fig. 7 is a transistor Q1, and the transistor Q1 is an NPN-type transistor. Wherein, the base electrode of the triode Q1 is connected with the fan driving port of the control circuit 30; the collector of the triode Q1 is connected to the fan 10, and the emitter of the triode Q1 is connected to the detection circuit 40. The fan 10 is connected to the fan driving circuit 20 through the connector 1 and the connector 2, wherein the connector 1 is connected to a power source VCC, for example, a power source of 18 volts, and the connector 2 is connected to the collector of the transistor Q1, so that the connection between the fan 10 and the collector of the transistor Q1 is realized. The control circuit 30 may be an MCU chip, a FAN drive port is represented by a FAN port on the MCU chip in fig. 6, and a sampling port is represented by an AD port on the MCU chip.
The control circuit 30 sends the first level signal or the second level signal to the base of the transistor Q1 through the fan driving port. When the transistor Q1 receives the second level signal, it is turned on, the loop where the fan 10, the fan driving circuit 20 and the detection circuit 40 are located is turned on, and the current flows through the fan 10, the collector and the emitter of the transistor Q1, and the first resistor R1 in the detection circuit 40. At this time, the sampling port of the control circuit 30 samples the voltage and/or the current of the first resistor R1 through the integrating circuit 50, and further obtains the voltage and/or the current of the fan 10. When the triode Q1 receives the first level signal, it is turned off (or called as cut-off), and the loop where the fan 10, the fan driving circuit 20 and the detection circuit 40 are located is turned off, and the loop loses current, and the sampling port stops collecting.
In a possible implementation manner, the collector of the transistor Q1 is further connected to the power VCC through a diode D1, and the diode D1 performs a shunting function, so as to prevent an excessive current from flowing into the transistor Q1 and protect the transistor Q1. The anode of the diode D1 is connected to the collector of the transistor Q1, and the cathode of the diode D1 is connected to the power source VCC.
In a possible implementation manner, a third resistor R3 is connected between the base of the triode Q1 and the fan driving port of the control circuit 30, and the third resistor R3 plays a role in limiting current, so as to prevent an excessive current from flowing into the fan driving port and protect the control circuit 30. The resistance of the third resistor R3 is, for example, 1 kilo-ohm.
In a possible implementation manner, the control circuit 30 analyzes the detection result received by the sampling port, and if the working state of the fan 10 is abnormal (including abnormal voltage and/or current of the fan 10) through analysis, sends a first level signal to the triode Q1, and when the triode Q1 receives the first level signal, the triode Q1 is turned off, and the fan 10 stops rotating; if the fan 10 is in a normal operating state (including the fan 10 is in a normal voltage and/or circuit state) as determined by the analysis, a second level signal is sent to the transistor Q1, the transistor Q1 is turned on, and the fan 10 starts to rotate. Therefore, the control circuit 30 controls the rotation of the fan 10 according to the working state of the fan 10, and the safety of the fan 10, the fan detection circuit and the heating device where the fan detection circuit is located is improved.
In the blower detection circuit provided by this embodiment, the triode Q1 in the blower driving circuit 20 is connected between the blower 10 and the detection circuit 40, and the triode Q1 controls the on/off of the blower driving circuit 20 and the on/off of the detection circuit 40 and the blower 10, so as to realize the timely detection of the voltage and/or current of the blower 10 by the detection circuit 40, and effectively improve the detection effect of the working state of the blower 10.
The embodiment of the application also provides heating equipment, and the heating equipment comprises the fan detection circuit in any one of the above embodiments. The heating equipment can perform one or more operations of fan working state adjustment, heating state adjustment and prompt message output according to the working state of the fan detected by the fan detection circuit, so that the safety of the heating equipment is improved.
Optionally, the adjustment mode of the working state of the fan includes one or more of the following: the fan is closed, the rotating speed of the fan is adjusted, and a corresponding adjusting mode can be selected according to the working state of the fan. For example, the heating device may turn off the fan when a short circuit of the fan is detected. For another example, when the heating device detects that the rotation speed of the fan is too fast or too slow, the rotation speed of the fan can be adjusted by adjusting the frequency and the duration of the driving signal sent by the control circuit to the fan driving circuit.
Optionally, the adjustment manner of the heating state includes one or more of the following: stopping heating, adjusting the heating temperature, and selecting a corresponding adjusting mode according to the working state of the fan. For example, when the heating device detects that the rotation speed of the fan is too slow or stops rotating due to circuit breaking, the heating device can stop heating or reduce the current heating temperature so as to reduce the heat generation amount and improve the safety of the heating device. For another example, when the fan detection circuit detects that the fan is short-circuited, the heating is stopped, and the damage of other components on the circuit board caused by continuous heating after the fan is short-circuited is avoided as much as possible.
Optionally, the prompting message output mode includes one or more of the following: the prompting lamp flickers or lights normally, gives out prompting sound, outputs prompting information through a display screen, vibrates the heating equipment, and can select a corresponding adjusting mode according to the working state of the fan. For example, when the fan is short-circuited or disconnected, the fan working state abnormity is prompted to a user by giving out prompt tones.
Optionally, the heating device may be an electromagnetic heating device, such as an induction cooker, and the fan detection circuit may be located on a circuit board of the electromagnetic heating device, so as to improve the safety of the electromagnetic heating device.
The heating equipment provided by the embodiment can realize the detection of the working state of the fan, and can also perform one or more operations of fan working state adjustment, heating state adjustment and/or prompt message output based on the working state of the fan, so that the safety of the heating equipment is effectively improved, and meanwhile, a user and maintenance personnel can know that the fan breaks down in time.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.
In the present application, the terms "include" and variations thereof may refer to non-limiting inclusions; the term "or" and variations thereof may mean "and/or". The terms "first," "second," and the like in this application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. In the present application, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Claims (10)
1. A fan detection circuit comprises a fan (10), a fan driving circuit (20) and a control circuit (30), wherein the input end of the fan driving circuit (20) is connected with a fan driving port of the control circuit (30), and the output end of the fan driving circuit (20) is connected with the fan (10), the fan detection circuit is characterized by further comprising a detection circuit (40), the control circuit (30) further comprises a sampling port, the input end of the detection circuit (40) is connected with the fan (10), and the output end of the detection circuit (40) is connected with the sampling port;
the detection circuit (40) is used for detecting the voltage and/or the current of the fan (10) and sending a detection result to the sampling port;
the control circuit (30) is used for determining the working state of the fan (10) according to the detection result received by the sampling port.
2. The circuit of claim 1,
the detection circuit (40) comprises a first resistor R1, one side of the first resistor R1 is respectively connected with the fan (10) and the sampling port, and the other side of the first resistor R1 is grounded.
3. The circuit of claim 2,
an integrating circuit (50) is connected between the first resistor R1 and the sampling port.
4. The circuit of claim 3,
the integrating circuit (50) comprises a current limiting circuit (51) and a filtering circuit (52);
the input end of the current limiting circuit (51) is connected with one side, away from the ground, of the first resistor R1, and the output end of the current limiting circuit (51) is connected with the sampling port;
one side of the filter circuit (52) is connected with the output end of the current limiting circuit (51), and the other side of the filter circuit is grounded.
5. The circuit of claim 4, wherein the current limiting circuit (51) comprises a second resistor R2 and the filter circuit (52) comprises a capacitor C1.
6. The circuit according to any one of claims 1-5,
the fan driving circuit (20) further comprises a switch circuit (21);
the control circuit (30) analyzes the detection result, if the voltage and/or the current of the fan (10) are analyzed to be abnormal, a first level signal is sent to the switch circuit (21), the switch circuit (21) is disconnected, the fan (10) stops rotating, if the voltage and/or the current of the fan (10) are analyzed to be normal, a second level signal is sent to the switch circuit (21), the switch circuit (21) is connected, and the fan (10) starts rotating.
7. The circuit of claim 6,
the fan-type fan-shaped fan is characterized in that the switch circuit (21) is connected between the detection circuit (40) and the fan (10), when the switch circuit (21) is conducted, the detection circuit (40) is connected between the fan (10) and conducted, and when the switch circuit (21) is disconnected, the detection circuit (40) is disconnected between the fan (10).
8. The circuit of claim 7,
a first pole of the switch circuit (21) is connected with the fan (10), a second pole of the switch circuit (21) is connected with a fan driving port of the control circuit (30), and a third pole of the switch circuit (21) is connected with the detection circuit (40);
when the switch circuit (21) is turned off, the first pole and the third pole of the switch circuit (21) are turned off, and when the switch circuit (21) is turned on, the first pole and the third pole of the switch circuit (21) are turned on.
9. The circuit of claim 8, wherein the switching circuit (21) is a transistor Q1.
10. A heating apparatus, comprising: the blower detection circuit of any one of claims 1-9;
and the heating equipment performs one or more operations of fan working state adjustment, heating state adjustment and prompt message output according to the working state of the fan (10) detected by the fan detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021553506.2U CN212774886U (en) | 2020-07-30 | 2020-07-30 | Fan detection circuit and heating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021553506.2U CN212774886U (en) | 2020-07-30 | 2020-07-30 | Fan detection circuit and heating equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212774886U true CN212774886U (en) | 2021-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021553506.2U Active CN212774886U (en) | 2020-07-30 | 2020-07-30 | Fan detection circuit and heating equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212774886U (en) |
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2020
- 2020-07-30 CN CN202021553506.2U patent/CN212774886U/en active Active
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