CN112947170B - Double-fan control circuit and air conditioner - Google Patents
Double-fan control circuit and air conditioner Download PDFInfo
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- CN112947170B CN112947170B CN202110145806.XA CN202110145806A CN112947170B CN 112947170 B CN112947170 B CN 112947170B CN 202110145806 A CN202110145806 A CN 202110145806A CN 112947170 B CN112947170 B CN 112947170B
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- 238000002955 isolation Methods 0.000 claims description 34
- 230000009977 dual effect Effects 0.000 claims description 19
- 239000002699 waste material Substances 0.000 abstract description 9
- 239000003990 capacitor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
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- 239000003999 initiator Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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Abstract
The invention provides a double-fan control circuit and an air conditioner, and relates to the technical field of air conditioners. The double fan control circuit includes: the control chip is provided with a selection end and a receiving end, one end of the selection unit is connected with the selection end, the selection unit is respectively and electrically connected with the selection end, the first feedback end of the first fan and the second feedback end of the second fan, and the conduction unit is respectively and electrically connected with the receiving end, the first feedback end of the first fan and the second feedback end of the second fan; when the selection end outputs different control signals, the receiving end can receive different feedback signals, when the selection end outputs a first control signal, the receiving end receives the first feedback signal of the first fan, and when the selection end outputs a second control signal, the receiving end receives the second feedback signal of the second fan, so that the first feedback signal of the first fan and the second feedback signal of the second fan are possibly controlled to be received by one receiving end, and chip resource waste is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a double-fan control circuit and an air conditioner.
Background
The double-fan control mode is widely applied to an air conditioner, and the double-fan control mode needs to send driving signals to the first fan and the second fan respectively and needs to receive feedback signals of the first fan and the second fan to control the first fan and the second fan. The mode commonly adopted at present is that the chip is provided with different ports for receiving the feedback signals of the first fan and the second fan, so that the chip resource waste is caused.
Disclosure of Invention
The invention solves the problem of how to reduce the waste of chip resources.
In order to solve the problems, the invention provides a double-fan control circuit and an air conditioner.
In a first aspect, an embodiment of the present invention provides a dual fan control circuit for controlling a first fan and a second fan, where the dual fan control circuit includes: the control chip is provided with a selection end and a receiving end, one end of the selection unit is connected with the selection end, the selection unit is respectively and electrically connected with the selection end, the first feedback end of the first fan and the second feedback end of the second fan, and the conduction unit is respectively and electrically connected with the receiving end, the first feedback end of the first fan and the second feedback end of the second fan;
in a state that the selection end outputs a first control signal, the selection unit outputs a first conduction signal to enable the first feedback end to be conducted with the conduction unit, the second feedback end is cut off from the conduction unit, and the receiving end receives the first feedback signal of the first fan output by the conduction unit;
and in a state that the selection end outputs a second control signal, the selection unit outputs a second conduction signal to enable the second feedback end to be conducted with the conduction unit, the first feedback end is cut off with the conduction unit, and the receiving end receives the second feedback signal of the second fan output by the conduction unit.
In the embodiment of the invention, when the selection end outputs different control signals, the receiving end can receive different feedback signals, when the selection end outputs the first control signal, the receiving end receives the first feedback signal of the first fan, and when the selection end outputs the second control signal, the receiving end receives the second feedback signal of the second fan, so that the first feedback signal of the first fan and the second feedback signal of the second fan are possibly controlled to be received by one receiving end, and the chip resource waste is reduced.
In an alternative embodiment of the present invention, the selection unit includes a first switch and a second switch, the first switch is connected in series between the selection terminal and the first feedback terminal, and the second switch is connected in series between the selection terminal and the second feedback terminal;
in a state that the selection end outputs a first control signal, the first switch is turned off, the second switch is turned on, the first feedback end is turned on with the conduction unit, and the second feedback end is turned off with the conduction unit;
and in a state that the selection end outputs a second control signal, the second switch is turned off, the first switch is turned on, the second feedback end is turned on with the conduction unit, and the first feedback end is turned off with the conduction unit.
In an alternative embodiment of the present invention, the first switch is an optocoupler switch, an anode of a light emitting diode of the first switch is electrically connected to a driving power supply, a cathode of the light emitting diode of the first switch is electrically connected to the selection terminal, a collector of a light receiving triode of the first switch is electrically connected to the first feedback terminal, and an emitter of the light receiving triode of the first switch is grounded.
In an alternative embodiment of the present invention, the second switch is an optocoupler switch, an anode of a light emitting diode of the second switch is electrically connected to the selection terminal, a cathode of the light emitting diode of the second switch is grounded, a collector of a light receiving triode of the second switch is electrically connected to the second feedback terminal, and an emitter of the light receiving triode of the second switch is grounded.
In an alternative embodiment of the present invention, the conducting unit includes a trigger switch and a conducting switch that are connected in series, the trigger switch is electrically connected to the first feedback end and the second feedback end, and the conducting switch is electrically connected to the receiving end;
in a state that the selection end outputs a first control signal, the first feedback signal output by the first feedback end triggers the trigger switch to be conducted, and the trigger switch triggers the conduction switch to be conducted, so that the receiving end receives an electric signal, and the electric signal is the first feedback signal;
and in a state that the selection end outputs a second control signal, the second feedback signal output by the second feedback end triggers the trigger switch to be conducted, and the trigger switch triggers the conduction switch to be conducted, so that the receiving end receives an electric signal, and the electric signal is the second feedback signal.
In an alternative embodiment of the present invention, the trigger switch is a triode, a collector of the trigger switch is electrically connected to the conducting switch, an emitter of the trigger switch is grounded, and a base of the trigger switch is electrically connected to the first feedback end and the second feedback end.
In an alternative embodiment of the present invention, the conducting switch is an optocoupler switch, a cathode of a light emitting diode of the conducting switch is electrically connected with the trigger switch, an anode of the light emitting diode of the conducting switch is electrically connected with a conducting power supply, a collector of a light receiving triode of the conducting switch is electrically connected with a driving power supply, and an emitter of the light receiving triode of the conducting switch is electrically connected with the receiving end.
In an alternative embodiment of the present invention, the control chip further includes a first driving end, the dual fan control circuit further includes a first isolating switch, the first driving end is connected in series between the first driving end and a first starting end of the first fan, and the first driving end is configured to send a first driving signal to turn on the first isolating switch, so that the first starting end receives a first starting signal output by the first isolating switch, so as to start the first fan.
In an alternative embodiment of the present invention, the first isolating switch is an optocoupler switch, an anode of a light emitting diode of the first isolating switch is electrically connected to a driving power supply, a cathode of the light emitting diode of the first isolating switch is electrically connected to the first driving end, a collector of a light receiving triode of the first isolating switch is electrically connected to a conducting power supply, and an emitter of the light receiving triode of the first isolating switch is electrically connected to a first starting end of the first fan.
In an alternative embodiment of the present invention, the control chip further includes a second driving end, the dual fan control circuit further includes a second isolating switch, the second driving end is connected in series between the second driving end and a second starting end of the second fan, and the second driving end is configured to send a second driving signal to turn on the second isolating switch, so that the second starting end receives a second starting signal output by the second isolating switch, so as to start the second fan.
In an alternative embodiment of the present invention, the second isolation switch is an optocoupler switch, an anode of a light emitting diode of the second isolation switch is electrically connected to a driving power supply, a cathode of the light emitting diode of the second isolation switch is electrically connected to the second driving end, a collector of a light receiving triode of the second isolation switch is electrically connected to a conducting power supply, and an emitter of the light receiving triode of the second isolation switch is electrically connected to a second starting end of the second fan.
In a second aspect, an embodiment of the present invention provides an air conditioner, which includes the dual fan control circuit provided in the first aspect.
Drawings
Fig. 1 is a block diagram of a dual fan control circuit according to a first embodiment of the present invention, connected to a first fan and a second fan.
Fig. 2 is a circuit diagram of a dual fan control circuit according to a first embodiment of the present invention, which is connected to a first fan and a second fan.
Fig. 3 is a circuit diagram of a selection unit of a dual fan control circuit according to a first embodiment of the present invention.
Fig. 4 is a circuit diagram of a conducting unit of a dual fan control circuit according to a first embodiment of the present invention.
Fig. 5 is a circuit diagram of a connection between a first isolation switch and a first fan of a dual-fan control circuit according to a first embodiment of the present invention.
Fig. 6 is a circuit diagram of a connection between a second isolation switch and a second fan of a dual-fan control circuit according to a first embodiment of the present invention.
Reference numerals illustrate:
100-a double-fan control circuit; 110-a control chip; 112-select end; 114-a receiving end; 116-a first drive end; 118-a second drive end; 120-a selection unit; PC 1-a first switch; a1-an anode of a light emitting diode of the first switch; k1-negative electrode of light-emitting diode of the first switch; collector electrode of light receiving triode of C1-first switch; e1-emitter of light receiving triode of first switch; PC 2-a second switch; a2-the positive electrode of the light-emitting diode of the second switch; k2-the negative electrode of the light-emitting diode of the second switch; collector of light receiving triode of C2-second switch; e2-emitter of light receiving triode of the second switch; 130-turn-on unit; q1-a trigger switch; collector of CQ-trigger switch; eq—emitter of trigger switch; a base of the BQ-trigger switch; PC 3-on switch; a3-positive electrode of light-emitting diode of the on-switch; negative electrode of light-emitting diode of K3-on switch; collector electrode of light receiving triode of C3-conducting switch; e3-emitting electrodes of light receiving triodes of the on-state switches; d1-a first diode; r1-a first resistor; r2-a second resistor; d12—a second diode; r3-a third resistor; r4-fourth resistor; r5-fifth resistor; c11-a first capacitance; c12-a second capacitance; c13-a third capacitance; PC 4-a first isolating switch; a4-the positive electrode of the light-emitting diode of the first isolating switch; k4-negative electrode of light-emitting diode of the first isolating switch; collector electrodes of light receiving triodes of the C4-first isolating switch; e4-an emitter of a light receiving triode of the first isolating switch; r7-seventh resistor; PC 5-a second isolating switch; a5-the positive electrode of the light-emitting diode of the second isolating switch; negative electrode of light-emitting diode of K5-second isolating switch; collector electrodes of light receiving triodes of the C5-second isolating switches; e5-an emitter of a light receiving triode of the second isolating switch; r8-eighth resistor; r9-ninth resistance; r10-tenth resistor; r11-eleventh resistor; r12-twelfth resistor; r13-thirteenth resistance; r14-fourteenth resistors; r15-fifteenth resistor; r16-sixteenth resistance; 200-a first fan; 210-a first feedback terminal; 220-a first start terminal; 300-a second fan; 310-a second feedback terminal; 320-a second initiator.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
First embodiment
Referring to fig. 1 and 2, the present embodiment provides a dual-fan control circuit 100, where the dual-fan control circuit 100 provided in the present embodiment mainly controls a first fan 200 and a second fan 300 of an air conditioner, and can control the first fan 200 and the second fan 300 at the same time, so as to reduce chip resource waste.
The double-fan control method is widely applied to an air conditioner, and the double-fan control method needs to send driving signals to the first fan 200 and the second fan 300 respectively, and needs to receive feedback signals of the first fan 200 and the second fan 300 to control the first fan 200 and the second fan 300. The current common mode is that the chips are provided with different ports to receive the feedback signals of the first fan 200 and the second fan 300, so that the chip resource waste is caused.
In the present embodiment, the twin-fan control circuit 100 includes: the control chip 110, the selection unit 120 and the conduction unit 130, wherein the control chip 110 is provided with a selection end 112 and a receiving end 114, one end of the selection unit 120 is connected with the selection end 112, the selection unit 120 is respectively and electrically connected with the selection end 112, the first feedback end 210 of the first fan 200 and the second feedback end 310 of the second fan 300, and the conduction unit 130 is respectively and electrically connected with the receiving end 114, the first feedback end 210 of the first fan 200 and the second feedback end 310 of the second fan 300;
in a state that the selection end 112 outputs the first control signal, the selection unit 120 outputs the first conduction signal, so that the first feedback end 210 is conducted with the conduction unit 130, the second feedback end 310 is cut off from the conduction unit 130, and the receiving end 114 receives the first feedback signal of the first fan 200 output by the conduction unit 130;
in a state that the selection end 112 outputs the second control signal, the selection unit 120 outputs the second on signal, so that the second feedback end 310 is turned on with the on unit 130, the first feedback end 210 is turned off with the on unit 130, and the receiving end 114 receives the second feedback signal of the second fan 300 output by the on unit 130.
In this embodiment, when the selection unit 120 receives the first control signal output by the selection end 112, the first feedback end 210 is turned on with the turn-on unit 130, the second feedback end 310 is turned off with the turn-on unit 130, and the turn-on unit 130 is turned on under the action of the first feedback signal output by the first feedback end 210 and outputs the first feedback signal, so that the receiving end 114 receives the first feedback signal of the first fan 200. When the selection unit 120 receives the second control signal from the selection end 112, the second feedback end 310 is turned on with the turn-on unit 130, the first feedback end 210 is turned off with the turn-on unit 130, and the turn-on unit 130 is turned on under the action of the second feedback signal output from the second feedback end 310 and outputs the first feedback signal, so that the receiving end 114 receives the second feedback signal from the second fan 300. In this embodiment, when the selection end 112 outputs different control signals, the receiving end 114 can receive different feedback signals, when the selection end 112 outputs a first control signal, the receiving end 114 receives a first feedback signal of the first fan 200, and when the selection end 112 outputs a second control signal, the receiving end 114 receives a second feedback signal of the second fan 300, thereby realizing that one receiving end 114 may control to receive the first feedback signal of the first fan 200 and the second feedback signal of the second fan 300, and reducing chip resource waste.
Referring to fig. 2 and 3, in the present embodiment, the selecting unit 120 includes a first switch PC1 and a second switch PC2, the first switch PC1 is connected in series between the selecting terminal 112 and the first feedback terminal 210, and the second switch PC2 is connected in series between the selecting terminal 112 and the second feedback terminal 310; in a state that the selection terminal 112 outputs the first control signal, the first switch PC1 is turned off, and the second switch PC2 is turned on, so that the first feedback terminal 210 is turned on with the turn-on unit 130, and the second feedback terminal 310 is turned off with the turn-on unit 130; in a state where the selection terminal 112 outputs the second control signal, the second switch PC2 is turned off, the first switch PC1 is turned on, the second feedback terminal 310 is turned on with the turn-on unit 130, and the first feedback terminal 210 is turned off with the turn-on unit 130.
In this embodiment, when the selection end 112 outputs the first control signal, the first control signal is at a high level, so that the second switch PC2 is turned on and the first switch PC1 is turned off, the second feedback end 310 is grounded after the second switch PC2 is turned on, the second feedback signal is grounded, the connection between the first feedback end 210 and the first switch PC1 is at a high level, the first feedback signal output by the first feedback end 210 flows to the conduction unit 130, so that the conduction unit 130 is turned on, and the receiving end 114 receives the first feedback signal of the first fan 200.
Similarly, when the selection terminal 112 outputs the second control signal, the second control signal is at a low level, and at this time, the first switch PC1 is turned on and the second switch PC2 is turned off, the first switch PC1 is turned on to ground the first feedback terminal 210, and the first feedback signal output by the first feedback terminal 210 is grounded through the first switch PC 1. The connection between the second feedback end 310 and the second switch PC2 is at a high level, and the second feedback signal output by the second feedback end 310 flows to the conducting unit 130, so that the conducting unit 130 is conducted, and the receiving end 114 receives the second feedback signal of the second fan 300.
It is easy to understand that when the selection terminal 112 outputs the first control signal, the receiving terminal 114 receives the first feedback signal, and when the selection terminal 112 outputs the second control signal, the receiving terminal 114 receives the second feedback signal.
In this embodiment, the first switch PC1 is an optocoupler switch, the positive electrode A1 of the light emitting diode of the first switch is electrically connected to a driving power source, the negative electrode K1 of the light emitting diode of the first switch is electrically connected to the selection end 112, the collector C1 of the light receiving triode of the first switch is electrically connected to the first feedback end 210, and the emitter E1 of the light receiving triode of the first switch is grounded.
When the selection terminal 112 outputs the first control signal, i.e. outputs the high level, the positive electrode A1 of the light emitting diode of the first switch and the negative electrode K1 of the light emitting diode of the first switch are both at the high level, the light emitting diode of the first switch PC1 is turned off, further the light receiving triode of the first switch PC1 is turned off, and the first feedback signal output by the first feedback terminal 210 flows to the conducting unit 130, so that the receiving terminal 114 can receive the first feedback signal.
When the selection terminal 112 outputs the second control signal, i.e. outputs the low level, the negative electrode K1 of the light emitting diode of the first switch is grounded, a potential difference exists between the positive electrode A1 and the negative electrode of the light emitting diode of the first switch, the light emitting diode of the first switch PC1 is turned on to emit light, and the light receiving triode of the first switch PC1 receives the light of the light emitting diode of the first switch PC1 and is turned on, so that the first feedback terminal 210 is grounded, and the first feedback signal output by the first feedback terminal 210 is grounded.
In this embodiment, the driving power is a 3.3V power, and the first switch PC1 can be damaged by strong current in a manner of weak current control and strong current, so as to improve the service life of the whole dual fan control circuit 100.
In this embodiment, a first resistor R1 is connected in series between the positive electrode A1 of the light emitting diode of the first switch and the driving power supply, and the first resistor R1 can protect the positive electrode A1 of the light emitting diode of the first switch to avoid breakdown of the light emitting diode of the first switch PC1 due to voltage surge or instability of the driving power supply.
In this embodiment, a conductive power source is connected in parallel between the first feedback end 210 and the conductive unit 130, in other words, the first feedback end 210 is electrically connected to the conductive unit 130 after being connected in parallel with the conductive power source, and when the conductive unit 130 receives the first feedback signal output by the first feedback end 210, the conductive unit 130 may not be conductive due to the smaller current value of the first feedback signal, and the conductive power source can provide a partial voltage to enable the conductive unit 130 to be conductive smoothly while receiving the first feedback signal. The on power supply is also connected in series with a ninth resistor R9.
In this embodiment, a first diode D1 is further connected in series between the first feedback end 210 and the conducting unit 130, the positive electrode of the first diode D1 is electrically connected with the first feedback end 210, the negative electrode of the first diode D1 is electrically connected with the conducting unit 130, and the first diode D1 can protect the first feedback end 210 when the conducting unit 130 is damaged, so as to avoid current flowing back to the first feedback end 210.
In this embodiment, the second switch PC2 is an optocoupler switch, the positive electrode A2 of the light emitting diode of the second switch is electrically connected to the selection end 112, the negative electrode K2 of the light emitting diode of the second switch is grounded, the collector C2 of the light receiving triode of the second switch is electrically connected to the second feedback end 310, and the emitter E2 of the light receiving triode of the second switch is grounded.
Meanwhile, since the first control signal output by the selection end 112 is at a high level, a potential difference exists between two ends of the light emitting diode of the second switch PC2, the light emitting diode of the second switch PC2 is turned on, and the light receiving triode of the second switch PC2 receives the light emitted by the light emitting diode of the second switch PC2 and then is turned on, so that the second feedback end 310 is grounded, and the second feedback signal sent by the second feedback end 310 is grounded.
When the selection terminal 112 outputs the second control signal, i.e. outputs the low level, both ends of the light emitting diode of the second switch PC2 are grounded, the light emitting diode of the second switch PC2 is turned off, the light receiving transistor of the second switch PC2 is turned off, and the second feedback signal output by the second feedback terminal 310 flows to the conducting unit 130, so that the receiving terminal 114 receives the second feedback signal.
In this embodiment, a conductive power source is connected in parallel between the second feedback end 310 and the conductive unit 130, in other words, the second feedback end 310 is electrically connected to the conductive unit 130 after being connected in parallel with the conductive power source, and when the conductive unit 130 receives the second feedback signal output by the second feedback end 310, the conductive unit 130 may not be conductive due to the smaller current value of the second feedback signal, and the conductive power source can provide a partial voltage to enable the conductive unit 130 to be conductive smoothly while receiving the second feedback signal. Wherein, the on power supply is also connected in series with a tenth resistor R10.
It is to be easily understood that, in the present embodiment, when the selection terminal 112 outputs the first control signal, i.e. outputs the high level, the first switch PC1 turns off the second switch PC2 to be turned on, the first feedback signal flows to the conduction unit 130, and the second feedback signal is grounded. When the selection terminal 112 outputs the second control signal, i.e. outputs the low level, the first switch PC1 turns on the second switch PC2 and turns off, and the first feedback signal is grounded and the second feedback signal flows to the turn-on unit 130. That is, during operation, the receiving end 114 receives the first feedback signal or the second feedback signal independently, but does not receive the first feedback signal and the second feedback signal at the same time, and the receiving end 114 can receive the first feedback signal and the second feedback signal alternately through the alternate control of the first control signal and the second control signal.
A second resistor R2 is connected in series between the negative electrode K2 of the light emitting diode of the second switch and ground, and when the selection terminal 112 outputs a high level, the second resistor R2 can generate a potential difference between the light emitting diodes of the second switch PC2, so that the light emitting diodes of the second switch PC2 can be turned on.
Likewise, a second diode D12 is connected in series between the second feedback terminal 310 and the conducting unit 130, where an anode of the second diode D12 is electrically connected to the second feedback terminal 310, and a cathode of the second diode D12 is electrically connected to the conducting unit 130, so that the second diode can protect the second feedback terminal 310 when the conducting unit 130 is damaged, and prevent current from flowing back to the first feedback terminal 210.
Referring to fig. 2 and 4, in the present embodiment, the conducting unit 130 includes a trigger switch Q1 and a conducting switch PC3 connected in series, the trigger switch Q1 is electrically connected to the first feedback terminal 210 and the second feedback terminal 310, and the conducting switch PC3 is electrically connected to the receiving terminal 114.
In a state that the selection end 112 outputs the first control signal, the first feedback signal output by the first feedback end 210 triggers the trigger switch Q1 to be turned on, and the trigger switch Q1 triggers the conduction switch PC3 to be turned on, so that the receiving end 114 receives an electrical signal, where the electrical signal is the first feedback signal.
In a state that the selection end 112 outputs the second control signal, the second feedback signal output by the second feedback end 310 triggers the trigger switch Q1 to be turned on, and the trigger switch Q1 triggers the conduction switch PC3 to be turned on, so that the receiving end 114 receives an electrical signal, where the electrical signal is the second feedback signal.
In this embodiment, after the trigger switch Q1 is turned on, the trigger switch PC3 is turned on, so that the switch PC3 outputs an electrical signal to the receiving terminal 114. When the selection terminal 112 outputs the first control signal, the electrical signal received by the receiving terminal 114 is the first feedback signal, and when the selection terminal 112 outputs the second control signal, the electrical signal received by the receiving terminal 114 is the second feedback signal.
In this embodiment, the trigger switch Q1 is a triode, the collector CQ of the trigger switch is electrically connected to the conducting switch PC3, the emitter EQ of the trigger switch is grounded, and the base BQ of the trigger switch is electrically connected to the first feedback terminal 210 and the second feedback terminal 310.
In this embodiment, when the base BQ of the trigger switch receives the first feedback signal or the second feedback signal, the collector CQ and the emitter of the trigger switch are turned on, so that the conduction unit 130 can output an electrical signal.
In this embodiment, the conducting switch PC3 is an optocoupler switch, the cathode K3 of the light emitting diode of the conducting switch is electrically connected to the trigger switch Q1, the anode A3 of the light emitting diode of the conducting switch is electrically connected to a conducting power source, the collector C3 of the light receiving triode of the conducting switch is electrically connected to a driving power source, and the emitter E3 of the light receiving triode of the conducting switch is electrically connected to the receiving end 114.
In this embodiment, the driving power is 3.3V power, and the on power is 15V power. The optocoupler switch is used to isolate strong electricity from weak points, so that the control chip 110 is prevented from being damaged by overlarge currents of the first feedback signal and the second feedback signal.
In this embodiment, a third resistor R3 is connected in series between the positive electrode A3 of the light emitting diode of the on-switch and the on-power supply, and similarly, the third resistor R3 can protect the positive electrode A3 of the light emitting diode of the on-switch, so as to avoid the over-large on-power supply or unstable breakdown of the on-power supply.
And a fourth resistor R4 is connected in series between the emitter E3 of the light receiving triode of the conduction switch and the ground, and the fourth resistor R4 can protect the light emitting triode which is conducted and turned on, so that the conduction switch PC3 is prevented from being damaged due to the fact that the potential difference between the collector and the two ends of the emitter of the light emitting triode is the same.
A fifth resistor R5 is connected in series between the emitter E3 of the light receiving triode of the switch and the receiving end 114, a first capacitor C11 is connected in series between the receiving end 114 and the ground, and the fifth resistor R5 and the first capacitor C11 form a filtering unit, so that the electric signal received by the receiving end 114 can be filtered.
Referring to fig. 2 and 5, in the present embodiment, the control chip 110 further includes a first driving end 116, the dual-fan control circuit 100 further includes a first isolation switch PC4, the first isolation switch PC4 is connected in series between the first driving end 116 and a first start end 220 of the first fan 200, and the first driving end 116 is configured to send a first driving signal to turn on the first isolation switch PC4, so that the first start end 220 receives a first start signal output by the first isolation switch PC4 to start the first fan 200.
In this embodiment, the first isolating switch PC4 isolates the control chip 110 from the first fan 200, so as to avoid a short circuit caused by the common ground of the three-phase power and the single-phase power of the first fan 200, and skillfully solve the problem that the control chip 110 of the three-phase power cannot directly control the first fan 200 of the single-phase power.
In this embodiment, the first isolation switch PC4 is an optocoupler switch, the positive electrode of the light emitting diode of the first isolation switch PC4 is electrically connected to a driving power source, the negative electrode K4 of the light emitting diode of the first isolation switch is electrically connected to the first driving end 116, the collector C4 of the light receiving triode of the first isolation switch is electrically connected to a conducting power source, and the emitter E4 of the light receiving triode of the first isolation switch is electrically connected to the first starting end 220 of the first fan 200.
When the first driving end 116 outputs the first driving signal, the first driving signal is at a low level, a potential difference exists between the anode A4 and the cathode of the light emitting diode of the first isolating switch, the light emitting diode is turned on, the light receiving triode of the first isolating switch PC4 is turned on, the emitter of the light receiving triode of the first isolating switch PC outputs a first start signal, and the first fan 200 is started after receiving the first start signal.
In this embodiment, a seventh resistor R7 is connected in series between the first driving end 116 and the negative electrode K4 of the light emitting diode of the first isolating switch, and the seventh resistor R7 can make a certain potential difference exist between the positive electrode and the negative electrode of the light emitting diode, so as to avoid the breakdown of the light emitting diode.
An eleventh resistor R11 is connected in series between the emitter E4 of the light receiving triode of the first isolating switch and the ground, and the eleventh resistor R11 can protect the light emitting triode of the first isolating switch PC4 and prevent the same potential difference between the collector and the two ends of the emitter of the light emitting triode from damaging the conduction switch PC3.
A twelfth resistor R12 is connected in series between the emitter E4 of the light receiving triode of the first isolating switch and the receiving end 114, a second capacitor C12 is connected in series between the receiving end 114 and the ground, and the twelfth resistor R12 and the second capacitor C12 form a filtering unit, so that the electric signal received by the receiving end 114 can be filtered.
The twelfth resistor R12 and the eleventh resistor R11 are connected in parallel, and then a thirteenth resistor R13 is connected in series between the twelfth resistor R12 and the emitter E4 of the light receiving triode of the first isolating switch.
Referring to fig. 2 and 6, in the present embodiment, the control chip 110 further includes a second driving end 118, the dual-fan control circuit 100 further includes a second isolation switch PC5, the second driving end 118 is connected in series between the second driving end 118 and a second starting end 320 of the second fan 300, and the second driving end 118 is configured to send a second driving signal to turn on the second isolation switch PC5, so that the second starting end 320 receives a second starting signal output by the second isolation switch PC5 to start the second fan 300.
In this embodiment, the second isolating switch PC5 isolates the control chip 110 from the second fan 300, so as to avoid a short circuit caused by the common ground of the three-phase power and the single-phase power of the second fan 300, and skillfully solve the problem that the control chip 110 of the three-phase power cannot directly control the second fan 300 of the single-phase power.
In this embodiment, the second isolation switch PC5 is an optocoupler switch, the positive electrode of the light emitting diode of the second isolation switch PC5 is electrically connected to a driving power source, the negative electrode K5 of the light emitting diode of the second isolation switch is electrically connected to the second driving end 118, the collector electrode C5 of the light receiving triode of the second isolation switch is electrically connected to a conducting power source, and the emitter electrode E5 of the light receiving triode of the second isolation switch is electrically connected to the second starting end 320 of the second fan 300.
When the second driving end 118 outputs the second driving signal, the second driving signal is at a low level, a potential difference exists between the anode A5 and the cathode of the light emitting diode of the second isolating switch, the light emitting diode is turned on, the light receiving triode of the second isolating switch PC5 is turned on, the emitter of the light receiving triode of the second isolating switch outputs a second starting signal, and the second fan 300 is started after receiving the second starting signal.
In the present embodiment, an eighth resistor R8 is connected in series between the second driving end 118 and the negative electrode K5 of the light emitting diode of the second isolating switch, and the eighth resistor R8 can make a certain potential difference exist between the positive electrode and the negative electrode of the light emitting diode, so as to avoid the breakdown of the light emitting diode.
A fourteenth resistor R14 is connected in series between the emitter E5 of the light receiving triode of the second isolating switch and the ground, and the fourteenth resistor R14 can protect the light emitting triode of the second isolating switch PC5 and prevent the same potential difference between the collector and the two ends of the emitter of the light emitting triode from damaging the conduction switch PC3.
A fifteenth resistor R15 is connected in series between the emitter E5 of the light receiving triode of the second isolating switch and the receiving end 114, a third capacitor C13 is connected in series between the receiving end 114 and the ground, and the fifteenth resistor R15 and the third capacitor C13 form a filtering unit, so that the electric signal received by the receiving end 114 can be filtered.
The fourteenth resistor R14 and the fifteenth resistor R15 are connected in parallel, and then a sixteenth resistor R16 is connected in series between the fourteenth resistor R14 and the emitter E5 of the light receiving triode of the second isolating switch.
In summary, in the dual-fan control circuit 100 provided in the present embodiment, when the selection unit 120 receives the first control signal output by the selection end 112, the first feedback end 210 is turned on with the conduction unit 130, the second feedback end 310 is turned off with the conduction unit 130, and the conduction unit 130 is turned on under the action of the first feedback signal output by the first feedback end 210 and outputs the first feedback signal, so that the receiving end 114 receives the first feedback signal of the first fan 200. When the selection unit 120 receives the second control signal from the selection end 112, the second feedback end 310 is turned on with the turn-on unit 130, the first feedback end 210 is turned off with the turn-on unit 130, and the turn-on unit 130 is turned on under the action of the second feedback signal output from the second feedback end 310 and outputs the first feedback signal, so that the receiving end 114 receives the second feedback signal from the second fan 300. In this embodiment, when the selection end 112 outputs different control signals, the receiving end 114 can receive different feedback signals, when the selection end 112 outputs a first control signal, the receiving end 114 receives a first feedback signal of the first fan 200, and when the selection end 112 outputs a second control signal, the receiving end 114 receives a second feedback signal of the second fan 300, thereby realizing that one receiving end 114 may control to receive the first feedback signal of the first fan 200 and the second feedback signal of the second fan 300, and reducing chip resource waste.
Second embodiment
The embodiment provides an air conditioner, which can reduce waste of chip resources.
In this embodiment, the air conditioner includes a first fan 200, a second fan 300, and the dual-fan control circuit 100 provided in the first embodiment.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (10)
1. A dual fan control circuit for controlling a first fan (200) and a second fan (300), the dual fan control circuit (100) comprising: the control chip (110), the selection unit (120) and the conduction unit (130), wherein the control chip (110) is provided with a selection end (112) and a receiving end (114), one end of the selection unit (120) is connected with the selection end (112), the selection unit (120) is respectively electrically connected with the selection end (112), a first feedback end (210) of the first fan (200) and a second feedback end (310) of the second fan (300), and the conduction unit (130) is respectively electrically connected with the receiving end (114), the first feedback end (210) of the first fan (200) and the second feedback end (310) of the second fan (300);
in a state that the selection end (112) outputs a first control signal, the selection unit (120) outputs a first conduction signal to enable the first feedback end (210) to be conducted with the conduction unit (130), the second feedback end (310) is cut off from the conduction unit (130), and the receiving end (114) receives the first feedback signal of the first fan (200) output by the conduction unit (130);
in a state that the selection end (112) outputs a second control signal, the selection unit (120) outputs a second conduction signal to enable the second feedback end (310) to be conducted with the conduction unit (130), the first feedback end (210) is cut off from the conduction unit (130), and the receiving end (114) receives the second feedback signal of the second fan (300) output by the conduction unit (130);
the selection unit (120) comprises a first switch (PC 1) and a second switch (PC 2), wherein the first switch (PC 1) is connected in series between the selection end (112) and the first feedback end (210), and the second switch (PC 2) is connected in series between the selection end (112) and the second feedback end (310);
in a state that the selection terminal (112) outputs a first control signal, the first switch (PC 1) is turned off, the second switch (PC 2) is turned on, the first feedback terminal (210) is turned on with the turn-on unit (130), and the second feedback terminal (310) is turned off with the turn-on unit (130);
in a state that the selection terminal (112) outputs a second control signal, the second switch (PC 2) is turned off, the first switch (PC 1) is turned on, the second feedback terminal (310) is turned on with the turn-on unit (130), and the first feedback terminal (210) is turned off with the turn-on unit (130);
the first switch (PC 1) is an optocoupler switch, the positive electrode (A1) of the light emitting diode of the first switch is electrically connected with a driving power supply, the negative electrode (K1) of the light emitting diode of the first switch is electrically connected with the selection end (112), the collector electrode (C1) of the light receiving triode of the first switch is electrically connected with the first feedback end (210), and the emitter electrode (E1) of the light receiving triode of the first switch is grounded.
2. The dual fan control circuit according to claim 1, wherein the second switch (PC 2) is an optocoupler switch, an anode of a light emitting diode of the second switch (PC 2) is electrically connected to the selection terminal (112), a cathode (K2) of the light emitting diode of the second switch is grounded, a collector (C2) of a light receiving triode of the second switch is electrically connected to the second feedback terminal (310), and an emitter (E2) of the light receiving triode of the second switch is grounded.
3. The twin-fan control circuit according to claim 1, wherein the conducting unit (130) comprises a trigger switch (Q1) and a conducting switch (PC 3) connected in series, the trigger switch (Q1) being electrically connected to the first feedback terminal (210) and the second feedback terminal (310), the conducting switch (PC 3) being electrically connected to the receiving terminal (114);
in a state that the selection end (112) outputs a first control signal, a first feedback signal output by the first feedback end (210) triggers the trigger switch (Q1) to be conducted, and the trigger switch (Q1) triggers the conduction switch (PC 3) to be conducted, so that the receiving end (114) receives an electric signal, and the electric signal is the first feedback signal;
in a state that the selection end (112) outputs a second control signal, the second feedback signal output by the second feedback end (310) triggers the trigger switch (Q1) to be turned on, and the trigger switch (Q1) triggers the conduction switch (PC 3) to be turned on, so that the receiving end (114) receives an electric signal, and the electric signal is the second feedback signal.
4. A twin-fan control circuit according to claim 3, in which the trigger switch (Q1) is a triode, the Collector (CQ) of the trigger switch is electrically connected to the conducting switch (PC 3), the Emitter (EQ) of the trigger switch is grounded, and the Base (BQ) of the trigger switch is electrically connected to the first feedback terminal (210) and the second feedback terminal (310).
5. A twin-fan control circuit according to claim 3, wherein the conducting switch (PC 3) is an optocoupler switch, a cathode (K3) of a light emitting diode of the conducting switch is electrically connected to the trigger switch (Q1), an anode (A3) of the light emitting diode of the conducting switch is electrically connected to a conducting power supply, a collector (C3) of a light receiving triode of the conducting switch is electrically connected to a driving power supply, and an emitter (E3) of the light receiving triode of the conducting switch is electrically connected to the receiving end (114).
6. The dual fan control circuit of claim 1, wherein the control chip (110) further comprises a first driving end (116), the dual fan control circuit (100) further comprises a first isolating switch (PC 4), the first isolating switch (PC 4) is connected in series between the first driving end (116) and a first starting end (220) of the first fan (200), and the first driving end (116) is configured to send a first driving signal to turn on the first isolating switch (PC 4) so that the first starting end (220) receives a first starting signal output by the first isolating switch (PC 4) to start the first fan (200).
7. The dual fan control circuit according to claim 6, wherein the first isolation switch (PC 4) is an optocoupler switch, the positive electrode of the light emitting diode of the first isolation switch (PC 4) is electrically connected to a driving power source, the negative electrode (K4) of the light emitting diode of the first isolation switch is electrically connected to the first driving end (116), the collector (C4) of the light receiving triode of the first isolation switch is electrically connected to a conducting power source, and the emitter (E4) of the light receiving triode of the first isolation switch is electrically connected to the first starting end (220) of the first fan (200).
8. The dual fan control circuit of claim 1, wherein the control chip (110) further comprises a second driving end (118), the dual fan control circuit (100) further comprises a second isolating switch (PC 5), the second isolating switch (PC 5) is connected in series between the second driving end (118) and a second starting end (320) of the second fan (300), and the second driving end (118) is configured to send a second driving signal to turn on the second isolating switch (PC 5) so that the second starting end (320) receives a second starting signal output by the second isolating switch (PC 5) to start the second fan (300).
9. The dual fan control circuit according to claim 8, wherein the second isolation switch (PC 5) is an optocoupler switch, the positive electrode of the light emitting diode of the second isolation switch (PC 5) is electrically connected to a driving power source, the negative electrode (K5) of the light emitting diode of the second isolation switch is electrically connected to the second driving end (118), the collector (C5) of the light receiving triode of the second isolation switch is electrically connected to a conducting power source, and the emitter (E5) of the light receiving triode of the second isolation switch is electrically connected to the second starting end (320) of the second fan (300).
10. An air conditioner comprising a twin fan control circuit (100) as claimed in any one of claims 1 to 9.
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