Air valve driving circuit and air valve

Abstract

The invention provides an air valve driving circuit. A proportional amplification circuit converts a current signal input by a motor driving circuit into a voltage signal and outputs the voltage signal to a comparator and an offset circuit; the comparator and the offset circuit judge whether the input voltage signal is greater than the reference voltage, if so, the comparator outputs a high level and controls the triode to be switched on, so that the driving signal of the motor driving circuit is reduced from the high level to the low level, and the motor driving circuit stops working; if not, the comparator and the comparator of the offset circuit output low level, the triode is controlled to be kept switched off, the driving signal of the motor driving circuit is kept at high level, and the motor driving circuit works normally. When the air valve is locked, the air valve driving circuit can timely reduce the driving signal of the motor driving circuit from a high level to a low level, so that the potentials on the two sides of the motor are equal, the air valve stops working, and a rotating shaft of the air valve is prevented from being damaged. The invention further provides an air valve applying the air valve driving circuit.

Description

Technical Field

[0001] The present invention belongs to the technical field of air valves, and in particular, relates to an air valve driving circuit and an air valve. Background Art

[0002] The air valve of the air conditioning system can easily be entered by foreign objects during rotation, causing it to become blocked. If the air valve is not closed in time, its shaft can be easily damaged.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] An object of the present invention is to overcome the deficiencies of the prior art and to provide a damper drive circuit that can shut down the damper in time when the damper is blocked to prevent damage to its rotating shaft.

[0005] Another object of the present invention is to provide a damper using the damper driving circuit.

[0006] In order to achieve the first invention objective, the present invention adopts the following technical solution:

[0007] A damper driving circuit comprises a motor driving circuit, a proportional amplifier circuit, a comparator and an offset circuit, wherein the proportional amplifier circuit converts a current signal inputted from the motor driving circuit into a voltage signal and outputs the voltage signal to the comparator and the offset circuit;

[0008] The comparator and the offset circuit determine whether the input voltage signal is greater than the reference voltage. If so, the comparator outputs a high level and controls the transistor to be turned on, so that the drive signal of the motor drive circuit flows to the negative electrode of the power supply through the transistor, and the drive signal drops from a high level to a low level, and the motor drive circuit stops working;

[0009] If not, the comparator outputs a low level, the control transistor remains off, the drive signal of the motor drive circuit remains high, there is a potential difference on both sides of the motor, and the motor drive circuit works normally.

[0010] Furthermore, the motor drive circuit includes a motor, a first power switch, a second power switch, a third power switch, and a fourth power switch arranged on both sides of the motor;

[0011] When the comparator outputs a high level, the first power switch and the fourth power switch are both turned off, and the second power switch and the third power switch are both turned on, so that both sides of the motor are connected to the negative pole of the power supply through the second power switch and the third power switch, the potentials on both sides of the motor are equal, and the motor drive circuit stops working.

[0012] Furthermore, when the first power switch and the third power switch are turned on at the same time, the current driving the air valve to rotate forward enters the first proportional amplifier circuit through the third power switch, and the first comparator and the offset circuit compare the voltage signal output by the first proportional amplifier circuit with the first reference voltage;

[0013] When the second power switch and the fourth power switch are turned on at the same time, the current driving the air valve to reverse enters the second proportional amplifier circuit through the second power switch, and the second comparator and the offset circuit compare the voltage signal output by the second proportional amplifier circuit with the second reference voltage.

[0014] Furthermore, a protective resistor is provided between the second power switch and the motor and / or a protective resistor is provided between the third power switch and the motor.

[0015] Furthermore, it also includes a first power switch driving circuit and a second power switch driving circuit;

[0016] The first power switch driving circuit is provided with a first chip, and a first output terminal and a second output terminal of the first chip are connected to a first power switch and a second power switch respectively;

[0017] The second power switch driving circuit is provided with a second chip, and the third output terminal and the fourth output terminal of the second chip are connected to the third power switch and the fourth power switch respectively.

[0018] Further, the first comparator and offset circuit includes a first comparator, a first transistor and a first resistor;

[0019] The first comparator is used to collect the voltage of the first resistor and set it as a first reference voltage, and the output end of the first comparator is connected to the first transistor.

[0020] Furthermore, a first current limiting resistor is provided between the first proportional amplifier circuit and the input terminal of the first comparator.

[0021] Further, the second comparator and offset circuit includes a second comparator, a second transistor and a second resistor;

[0022] The second comparator is used to collect the voltage of the second resistor and set it as a second reference voltage, and the output end of the second comparator is connected to the second transistor.

[0023] Furthermore, a second current limiting resistor is provided between the second proportional amplifier circuit and the input terminal of the second comparator.

[0024] In order to achieve the second invention objective, the present invention adopts the following technical solution:

[0025] A damper is driven by the damper driving circuit mentioned above.

[0026] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0027] 1. The present invention controls the air valve based on hardware. When a stall state occurs, the transistor is opened in time to reduce the drive signal of the motor drive circuit from a high level to a low level, so that the potential on both sides of the motor is equal, thereby stopping the air valve from working and preventing its shaft from being damaged.

[0028] 2. The air valve driving circuit of the present invention is provided with a protective resistor between the second power switch and the motor and / or a protective resistor between the third power switch and the motor. The protective resistor consumes the electric energy in the motor coil to prevent the air valve from continuing to rotate under its influence and damaging the air valve shaft.

[0029] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0031] Figure 1 It is a schematic diagram of the air valve driving circuit of the present invention.

[0032] Description of the main components in the figure: 1. Motor drive circuit; 2. First power switch drive circuit; 3. Second power switch drive circuit; 4. First proportional amplifier circuit; 5. Second proportional amplifier circuit; 6. First comparator and offset circuit; 7. Second comparator and offset circuit.

[0033] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0035] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The air valve of the air conditioning system is prone to foreign matter entering during operation, causing it to become blocked. At this time, if the air valve is not closed in time, its shaft is prone to damage.

[0038] Based on this, Figure 1 As shown, the present invention provides a damper driving circuit, comprising a motor driving circuit 1, a proportional amplifier circuit, a comparator and an offset circuit, wherein the proportional amplifier circuit converts a current signal input from the motor driving circuit into a voltage signal and outputs the voltage signal to the comparator and the offset circuit;

[0039] Specifically, the motor drive circuit 1 is used to drive the air valve to work, the input end of the proportional amplifier circuit is connected to the output end of the motor drive circuit 1, and the current signal of the motor drive circuit 1 is converted into a voltage signal, and its output end is connected to the input end of the comparator and the offset circuit.

[0040] The comparator and offset circuit comprises a comparator and a transistor connected to an output terminal of the comparator. The comparator can control the on or off of the transistor.

[0041] The comparator and the offset circuit determine whether the input voltage signal is greater than the reference voltage. If so, it indicates that the current signal collected by the proportional amplifier circuit is larger, that is, the current of the motor drive circuit 1 is larger, and the air valve is blocked. At this time, the comparator outputs a high level and controls the transistor to be turned on. After the transistor is turned on, the drive signal of the motor drive circuit 1 flows into the negative pole of the power supply through the transistor, and drops from a high level to a low level. Since the potentials on both sides of the motor are equal, the motor drive circuit 1 stops working, thereby quickly shutting down the air valve to prevent damage to its shaft.

[0042] If not, it indicates that the current signal collected by the proportional amplifier circuit is within the normal range, the air valve works normally, and no stalling occurs. At this time, the comparator outputs a low level and the transistor remains off. Since the drive signal of the motor drive circuit 1 cannot flow into the negative pole of the power supply through the transistor, it still maintains a high level. Under the action of the potential difference on both sides of the motor, the motor drive circuit 1 works normally.

[0043] The comparator and offset circuit includes a first comparator and offset circuit 6 connected to the first proportional amplifier circuit 4 and a second comparator and offset circuit 7 connected to the second proportional amplifier circuit 5 .

[0044] The first comparator and offset circuit 6 includes a first comparator U5, a first transistor Q6 and a first resistor R13. The first comparator U5 is used to collect the voltage of the first resistor R13 and set it as a first reference voltage. The output end of the first comparator U5 is connected to the first transistor Q6 to control the opening or closing of the first transistor Q6.

[0045] Furthermore, to protect the circuit, a first current limiting resistor R14 is provided between the first proportional amplifier circuit 4 and the input terminal of the first comparator U5.

[0046] The second comparator and offset circuit 7 includes a second comparator U4, a second transistor Q5 and a second resistor R9. The second comparator U4 is used to collect the voltage of the second resistor R9 and set it as a second reference voltage. The output end of the second comparator U4 is connected to the second transistor Q5 to control the opening or closing of the second transistor Q5.

[0047] Furthermore, to protect the circuit, a second current limiting resistor R8 is provided between the second proportional amplifier circuit 5 and the input terminal of the second comparator U4.

[0048] The motor driving circuit 1 includes a motor, a first power switch Q1, a second power switch Q2, a third power switch Q3, and a fourth power switch Q4 arranged on both sides of the motor.

[0049] In the present invention, when the first power switch Q1 and the third power switch Q3 are turned on at the same time, and the second power switch Q2 and the fourth power switch Q4 are turned off at the same time, the current driving the air valve to rotate forward enters the first proportional amplifier circuit 4 through the third power switch Q3, and the first comparator and offset circuit 6 compares the voltage signal output by the first proportional amplifier circuit 4 with the first reference voltage;

[0050] When the second power switch Q2 and the fourth power switch Q4 are turned on at the same time, the current driving the air valve to reverse enters the second proportional amplifier circuit 5 through the second power switch Q2, and the second comparator and offset circuit 7 compares the voltage signal output by the second proportional amplifier circuit 5 with the second reference voltage.

[0051] In one embodiment of the present invention, when the first power switch Q1 and the third power switch Q3 are turned on and the second power switch Q2 and the fourth power switch Q4 are turned off, the current driving the air valve to rotate forward flows into the negative electrode of the power supply through the first power switch Q1, the motor, the third power switch Q3, and the first collection resistor R17 of the first proportional amplifier circuit 4 in sequence. The first proportional amplifier circuit 4 converts the current signal flowing through the first collection resistor R17 into a voltage signal and outputs it to the first comparator and the offset circuit 6.

[0052] When the second power switch Q2 and the fourth power switch Q4 are turned on, and the first power switch Q1 and the third power switch Q3 are turned on and off, the current driving the air valve to reverse flows into the negative electrode of the power supply through the fourth power switch Q4, the motor, the second power switch Q2, and the second collection resistor R5 of the second proportional amplifier circuit 5 in sequence. The second proportional amplifier circuit 5 converts the current signal flowing through the second collection resistor R5 into a voltage signal and outputs it to the second comparator and the offset circuit 7.

[0053] To further ensure the stability of the system, when the comparator of the comparator and the offset circuit in the present invention outputs a high level, the first power switch Q1 and the fourth power switch Q4 are both turned off, and the second power switch Q2 and the third power switch Q3 are both turned on. Since both sides of the motor are connected to the negative pole of the power supply through the second power switch Q2 and the third power switch Q3, the potentials are equal. Therefore, the motor drive circuit 1 stops working at this time, and the air valve also stops working immediately.

[0054] In another embodiment of the present invention, considering that when the motor stops working, the residual electric energy in its coil may cause the air valve to continue working, in this embodiment, a protection resistor RP is provided between the second power switch Q2 and the motor and / or a protection resistor RP is provided between the third power switch Q3 and the motor. This part of the electric energy is consumed by the protection resistor RP, so that the air valve stops working when the motor stops working, thereby preventing the air valve from continuing to rotate and damaging its shaft.

[0055] The air valve driving circuit of the present invention further includes a first power switch driving circuit 2 and a second power switch driving circuit 3, wherein the first power switch driving circuit 2 is provided with a first chip U1, and the first output terminal and the second output terminal of the first chip U1 are respectively connected to the first power switch Q1 and the second power switch Q2. Specifically, a first driving resistor R1 is provided between the first output terminal of the first chip U1 and the first power switch Q1 to control the opening or closing of the first power switch Q1, and a second driving resistor R2 is provided between the second output terminal and the second power switch Q2 to control the opening or closing of the second power switch Q2.

[0056] The second power switch driving circuit 3 is provided with a second chip U2, and the third output terminal and the fourth output terminal of the second chip U2 are respectively connected to the third power switch Q3 and the fourth power switch Q4. Specifically, a third driving resistor R3 is provided between the third output terminal of the second chip U2 and the third power switch Q3 to control the opening or closing of the third power switch Q3, and a fourth driving resistor R4 is provided between the fourth output terminal and the fourth power switch Q4 to control the opening or closing of the fourth power switch Q4.

[0057] The working process of the air valve driving circuit of the present invention is as follows:

[0058] When the air valve rotates forward, the first power switch Q1 and the third power switch Q3 are both turned on, and the second power switch Q2 and the fourth power switch Q4 are both turned off. At this time, the current driving the air valve to rotate forward flows into the negative electrode of the power supply through the first power switch Q1, the motor, the third power switch Q3, and the first collection resistor R17 in sequence.

[0059] The first proportional amplifier circuit 4 converts the current signal flowing through the first acquisition resistor R17 into a voltage signal and outputs the voltage signal to the first comparator U5. The first comparator U5 compares the input voltage signal with the first reference voltage.

[0060] When not blocked, the input voltage signal is less than or equal to the first reference voltage, the first comparator U5 outputs a low level, the first transistor Q6 is turned off, the drive signal of the motor drive circuit 1 cannot be connected to the negative pole of the power supply through the first transistor Q6, and it still maintains a high level. There is a potential difference on both sides of the air valve motor, and the air valve can operate normally.

[0061] When the air valve is blocked, due to the increase in the current of the motor drive circuit 1, the voltage signal input to the first comparator U5 is greater than the first reference voltage, the first comparator U5 outputs a high level, the first transistor Q6 is turned on, and the drive signal of the motor drive circuit 1 is connected to the negative pole of the power supply through the first transistor Q6, and drops from a high level to a low level.

[0062] Furthermore, when a stall occurs, the first power switch Q1 and the fourth power switch Q4 are both turned off, and the second power switch Q2 and the third power switch Q3 are both turned on, so that the two sides of the air valve motor are connected to the negative electrode of the power supply through the first collection resistor R17 and the second collection resistor R5 respectively, and the potential on both sides is equal. At this time, the residual electric energy in the motor coil is consumed by the protection resistor RP, and the air valve stops running when the motor stops working to avoid damage to its shaft.

[0063] When the air valve reverses, the second power switch Q2 and the fourth power switch Q4 are both turned on, and the first power switch Q1 and the third power switch Q3 are both turned off. At this time, the current driving the air valve to reverse flows into the negative electrode of the power supply through the fourth power switch Q4, the motor, the second power switch Q2, and the second collection resistor R15 in sequence.

[0064] The second proportional amplifier circuit 5 converts the current signal flowing through the second collection resistor R5 into a voltage signal and outputs the voltage signal to the second comparator U4. The second comparator U4 compares the input voltage signal with the second reference voltage.

[0065] When the rotor is not blocked, the input voltage signal is less than or equal to the second reference voltage, the second comparator U4 outputs a low level, the second transistor Q5 is turned off, and the drive signal of the motor drive circuit 1 cannot be connected to the negative pole of the power supply through the second transistor Q5, and it still maintains a high level. There is a potential difference on both sides of the air valve motor, and the air valve can operate normally.

[0066] When the air valve is blocked, due to the increase in the current of the motor drive circuit 1, the voltage signal input to the second comparator U4 is greater than the second reference voltage, the second comparator U4 outputs a high level, the second transistor Q5 is turned on, and the drive signal of the motor drive circuit 1 is connected to the negative electrode of the power supply through the second transistor Q5, and drops from a high level to a low level.

[0067] Furthermore, when a stall occurs, the first power switch Q1 and the fourth power switch Q4 are both turned off, and the second power switch Q2 and the third power switch Q3 are both turned on, so that the two sides of the air valve motor are connected to the negative electrode of the power supply through the first collection resistor R17 and the second collection resistor R5 respectively, and the potential on both sides is equal. At this time, the residual electric energy in the motor coil is consumed by the protection resistor RP, and the air valve stops running when the motor stops working to avoid damage to its shaft.

[0068] The present invention also provides a wind valve which is driven by the wind valve driving circuit. When a stall occurs, the wind valve can be shut down relatively quickly to avoid damage to its rotating shaft.

[0069] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A wind valve driving circuit, characterized in that: It includes a motor drive circuit, a proportional amplifier circuit, a comparator and an offset circuit, wherein the proportional amplifier circuit converts the current signal input from the motor drive circuit into a voltage signal and outputs the voltage signal to the comparator and the offset circuit; The comparator and the offset circuit determine whether the input voltage signal is greater than the reference voltage. If so, the comparator outputs a high level and controls the transistor to be turned on, so that the drive signal of the motor drive circuit flows to the negative electrode of the power supply through the transistor, and the drive signal drops from a high level to a low level, and the motor drive circuit stops working; If not, the comparator outputs a low level, the control transistor remains off, the drive signal of the motor drive circuit remains high, there is a potential difference on both sides of the motor, and the motor drive circuit works normally.

2. A damper drive circuit according to claim 1, characterized in that: The motor drive circuit includes a motor, a first power switch, a second power switch, a third power switch, and a fourth power switch arranged on both sides of the motor; When the comparator outputs a high level, the first power switch and the fourth power switch are both turned off, and the second power switch and the third power switch are both turned on, so that both sides of the motor are connected to the negative pole of the power supply through the second power switch and the third power switch, the potentials on both sides of the motor are equal, and the motor drive circuit stops working.

3. A damper driving circuit according to claim 2, characterized in that: When the first power switch and the third power switch are turned on at the same time, the current driving the air valve to rotate forward enters the first proportional amplifier circuit through the third power switch, and the first comparator and the offset circuit compare the voltage signal output by the first proportional amplifier circuit with the first reference voltage; When the second power switch and the fourth power switch are turned on at the same time, the current driving the air valve to reverse enters the second proportional amplifier circuit through the second power switch, and the second comparator and the offset circuit compare the voltage signal output by the second proportional amplifier circuit with the second reference voltage.

4. A damper driving circuit according to claim 2, characterized in that: A protective resistor is provided between the second power switch and the motor and / or a protective resistor is provided between the third power switch and the motor.

5. A damper driving circuit according to claim 2, characterized in that: Also includes a first power switch driving circuit and a second power switch driving circuit; The first power switch driving circuit is provided with a first chip, and a first output terminal and a second output terminal of the first chip are connected to a first power switch and a second power switch respectively; The second power switch driving circuit is provided with a second chip, and the third output terminal and the fourth output terminal of the second chip are connected to the third power switch and the fourth power switch respectively.

6. A damper driving circuit according to claim 3, characterized in that: The first comparator and offset circuit includes a first comparator, a first transistor and a first resistor; The first comparator is used to collect the voltage of the first resistor and set it as a first reference voltage, and the output end of the first comparator is connected to the first transistor.

7. A damper driving circuit according to claim 6, characterized in that: A first current limiting resistor is arranged between the first proportional amplification circuit and the input terminal of the first comparator.

8. The air valve driving circuit according to claim 3, characterized in that: The second comparator and offset circuit includes a second comparator, a second triode and a second resistor; The second comparator is used to collect the voltage of the second resistor and set it as a second reference voltage, and the output end of the second comparator is connected to the second transistor.

9. A damper driving circuit according to claim 8, characterized in that: A second current limiting resistor is arranged between the second proportional amplification circuit and the input terminal of the second comparator.

10. A damper, characterized in that: The air valve driving circuit according to any one of claims 1 to 9 is used for driving.

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