Inverter and four-wire system fan control device thereof

Abstract

The utility model discloses an inverter and a four-wire system fan control device thereof, which can realize forward and reverse rotation control of a fan under the conventional four-wire system. A fan control device of an inverter comprises a system control unit and a fan unit, the system control unit comprises an auxiliary power supply circuit used for sending a first level signal and a second level signal to the fan unit, and the fan unit comprises a steering judgment circuit connected with the auxiliary power supply circuit through a first power line, the control module is used for receiving the first level signal to send out a forward rotation control signal, or receiving the second level signal to send out a reverse rotation control signal; the fan control circuit is connected with the steering control circuit through a signal line so as to receive the forward rotation control signal or the reverse rotation control signal and send out a fan control signal; the fan driving circuit is connected with the fan control circuit through a signal line, and the fan driving circuit is provided with an output end used for being connected with a fan.

Description

TECHNICAL FIELD

[0001] The utility model belongs to photovoltaic energy storage field relates to a kind of inverter and its four-wire fan control device. BACKGROUND

[0002] In inverter system, fan is usually used to dissipate heat of heat-generating components. When external fan works, it is easy to suck in dust, and long-term work of dust accumulation reduces the reliability of inverter operation. At present, using forward and reverse fan regular control fan reverse dust removal can better solve this problem.

[0003] Common DC fan is four-wire, including speed control line (PWM), speed feedback line (FG) and two power lines. The existing forward and reverse DC fan is five-wire, adding a steering control line, and the fan realizes forward and reverse control by detecting a separate steering signal. Therefore, the forward and reverse fan and the common fan line are not compatible, and the current four-wire scheme can only control the forward rotation of the fan.

[0004] The above information disclosed in the background section is only used to enhance the understanding of the background of the present application, so it can include information that does not constitute prior art known to those skilled in the art. INVENTION CONTENTS

[0005] Therefore, the utility model provides a kind of four-wire fan control device of inverter, can realize the forward and reverse control of fan under conventional four-wire.

[0006] The utility model adopts the following technical solutions:

[0007] A fan control device of inverter, comprising system control unit and fan unit,

[0008] The system control unit includes an auxiliary power supply circuit for sending first and second level signals to the fan unit, and the fan unit includes:

[0009] Steering judgment circuit, which is connected to the auxiliary power supply circuit through the first power line to receive the first level signal and send forward control signal, or receive the second level signal and send reverse control signal;

[0010] Fan control circuit, which is connected to the steering control circuit through signal line to receive the forward control signal or the reverse control signal and send fan control signal;

[0011] Fan drive circuit, which is connected to the fan control circuit through signal line, and the fan drive circuit has an output end for connecting fan.

[0012] In a preferred embodiment, the system control unit further comprises a system control module, which is connected to the auxiliary power supply circuit through an output voltage switching signal line to send a given output voltage signal to the auxiliary power supply circuit.

[0013] In a more preferred embodiment, the auxiliary power supply circuit comprises an auxiliary power supply main circuit with an isolation transformer, and an output winding of the isolation transformer is connected to the first power supply line.

[0014] In a further preferred embodiment, an input winding of the isolation transformer is connected to a second power supply line to access an external power supply; the output voltage switching signal line is connected to a given output voltage switching circuit, and the given output voltage switching circuit and a control and driving circuit of the isolation transformer are connected through signal lines.

[0015] In a more preferred embodiment, the auxiliary power supply circuit further comprises a buck circuit, one end of which is connected to the first power supply line, and the other end of which is connected to the system control module through a third power supply line to supply power to the system control module.

[0016] In a preferred embodiment, the fan driving circuit is connected to the first power supply line; the fan unit further comprises a fan power supply circuit, which is connected to the first power supply line and connected to the steering judgment circuit, the fan control circuit and the fan driving circuit through a fourth power supply line.

[0017] In a preferred embodiment, the fan unit further comprises a fan rotating speed detection circuit, which is connected to the steering control circuit and the fan control circuit through signal lines.

[0018] In a preferred embodiment, the system control module is connected to the fan control circuit through a signal line to send a given rotating speed signal to the fan control circuit.

[0019] In a preferred embodiment, the fan control device further comprises an interface unit, which has a group of fan power supply positive line interfaces, a group of fan power supply negative line interfaces, a group of fan rotating speed control interfaces and a group of fan rotating speed feedback interfaces, one fan power supply positive line interface, one fan power supply negative line interface, one fan rotating speed control interface and one fan rotating speed feedback interface of the system control unit and the interface unit are connected, and one fan power supply positive line interface, one fan power supply negative line interface, one fan rotating speed control interface and one fan rotating speed feedback interface of the fan unit and the interface unit are connected.

[0020] The utility model also adopts the following technical scheme:

[0021] An inverter comprising the fan control device, wherein the fan is arranged in or outside a cabinet of the inverter, and the fan driving circuit of the fan control device is connected to a motor of the fan through a fifth power line.

[0022] The above scheme has the following advantages:

[0023] The utility model provides a four -wire fan control device for inverter adopts the auxiliary power supply circuit that can output different level signal, passes through this auxiliary power supply circuit to fan unit power supply simultaneously transmits positive and negative rotation control signal, realizes the positive and negative rotation control of direct current fan under the conventional four -wire. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in the drawing only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0025] Figure 1 It is a structural diagram of a fan control device according to an embodiment of the utility model.

[0026] Figure 2 It is a structural diagram of an auxiliary power supply circuit according to an embodiment of the utility model.

[0027] Figure 3 It is a structural diagram of a steering judgment circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0028] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation on the utility model.

[0029] The present embodiment provides an inverter, in particular a fan control device of the inverter, which can control the fan to rotate forward or reverse based on four-wire control, so as to control the fan to reverse in time to remove dust. The fan is arranged in or outside the cabinet of the inverter to dissipate heat from the heat-generating components of the inverter. The fan is suitable for four-wire control, including a speed control line (PWM), a speed feedback line (FG) and two power lines.

[0030] REFERENCE Figure 1As shown, the fan control device of the inverter includes a system control unit 1, a fan unit 2 and an interface unit 3. The system control unit 1 provides the fan unit 2 with required power supply and control signals, and receives real-time working condition information of the fan for fault logic judgment. The fan unit 2 receives power supply and signals through the interface unit 3, controls the fan to work according to given signals and feeds back real-time working condition information. The system control unit 1 and the fan unit 2 are connected through the interface unit 3.

[0031] The system control unit 1 includes an auxiliary power supply circuit 11 and a system control module 12. The power supply line P2 of the auxiliary power supply circuit 11 is connected to the external power supply 4 to receive electric energy of the external power supply 4. The power supply line P1 is connected to a fan power supply interface to supply power to the fan unit 2. The power supply line P3 is connected to the system control module 12 to supply power to the system control module 12. The output voltage switching signal line S1 is connected to the system control module 12 to receive a given output voltage switching signal from the system control module 12. When the signal line S1 inputs a disable signal, the power supply line P1 outputs a first output voltage value (a first level signal, for example, a high level signal). When the signal line S1 inputs an enable signal, the power supply line P1 outputs a second output voltage value (a second level signal, for example, a low level signal). The signal line S2 of the system control module 12 is connected to a fan speed control interface PWM to provide a given speed signal for fan working. The signal line S3 is connected to a fan speed feedback interface FG to receive an actual speed signal output by a fan speed detection module.

[0032] One of the functions of the auxiliary power supply circuit 11 is to receive electric energy of the external power supply 4 to supply power to the entire fan control device, and another function is to send the fan unit 2 with a first level signal and a second level signal to adjust the rotating direction of the fan through level change of the signal. Figure 2 An auxiliary power supply circuit 11 that can be used in the embodiment is shown. Referring to Figure 2As shown, the auxiliary power supply circuit 11 comprises an auxiliary power supply main circuit with an isolation transformer 111, the main circuit further comprises a plurality of active devices and passive devices, the isolation transformer 111 comprises an input winding (primary winding) and a plurality of output windings (secondary windings). The input winding of the isolation transformer 111 is connected with the second power supply line P2 to access the external power supply 4. One or more output windings of the isolation transformer 111 are connected with the first power supply line P1. The output voltage switching signal line S1 is connected to a given output voltage switching circuit 113, and the given output voltage switching circuit 113 is connected with a control and driving circuit 112 of the isolation transformer 111 through a signal line S11. The control and driving circuit 112 can be connected with one output winding of the isolation transformer 111, so as to adjust the output voltage of the first power supply line P1 according to the winding ratio and the load cross regulation. The auxiliary power supply circuit 11 further comprises a buck circuit 114, one end of the buck circuit 114 is connected with the first power supply line P1, and the other end of the buck circuit 114 is connected with the system control module 12 through a third power supply line P3 to supply power to the system control module 12.

[0033] When the input signal of the connected output voltage switching signal line S1 is a disable signal, the given output voltage switching circuit 113 provides a first given output signal to the control and driving circuit 112 through the signal line S11, the control and driving circuit 112 sends a driving signal to the auxiliary power supply main circuit through the signal line S12 to control the auxiliary power supply main circuit to output a first output voltage value. When the input signal of the connected signal line S1 is an enable signal, the given output voltage switching circuit 113 provides a second given output signal to the control and driving circuit 112 through the signal line S11, the control and driving circuit 112 sends a driving signal to the auxiliary power supply main circuit through the signal line S12 to control the auxiliary power supply main circuit to output a second output voltage value. The buck circuit 114 realizes a voltage reduction function and sets an output to a third output voltage value to supply power to the system control module 12.

[0034] The fan unit 2 comprises a fan driving circuit 21, a fan power supply circuit 22, a direction judging circuit 23, a fan control circuit 24 and a fan rotating speed detecting circuit 25. The power line P1 of the interface unit 3 is connected to the fan power supply circuit 22, the direction judging circuit 23 and the fan driving circuit 21 respectively to supply power to each circuit. The output power line P4 of the fan power supply circuit 22 is connected to the direction judging circuit 23 and the fan control circuit 24 to supply power to the two circuits. The positive and negative rotation control signal line S4 of the direction judging circuit 23 is connected to the fan control circuit 24 to transmit the fan positive and negative rotation control signal to the fan control circuit 24, outputting the fan positive rotation signal when the power voltage is greater than the first threshold value and outputting the fan negative rotation signal when the power voltage is less than the second threshold value. The given rotating speed signal line S2 is connected to the fan control circuit 24 to transmit the given rotating speed information. The rotating speed feedback signal line S3 is connected to the fan control circuit 24 and the fan rotating speed detecting circuit 25 to output the real-time rotating speed signal by the fan rotating speed detecting circuit 25. The fan control circuit 24 outputs the fan control signal S5 connected to the fan driving circuit 21 according to the given rotating speed signal line S2, the positive and negative rotation control signal line S4 and the rotating speed feedback signal line S3 through logical judgment. The fan driving circuit 21 outputs the fan driving power P5 connected to the fan motor according to the control signal to drive the fan to realize the positive and negative rotation work.

[0035] The direction judging circuit 23 and the auxiliary power supply circuit 11 are connected by the first power line P1 to output the positive rotation control signal when receiving the first level signal and output the negative rotation control signal when receiving the second level signal. The fan control circuit 24 and the direction control circuit are connected by the signal line to receive the positive rotation control signal or the negative rotation control signal to output the fan control signal. The fan driving circuit 21 is connected to the first power line and connected to the fan control circuit 24 by the signal line. The fan driving circuit 21 has an output end for connecting the fan, specifically connected to the motor M of the fan by the fifth power line P5. The fan power supply circuit 22 is connected to the first power line P1 and connected to the direction judging circuit 23, the fan control circuit 24 and the fan driving circuit 21 by the fourth power line P5.

[0036] The interface unit 3 has a set of fan power positive line interfaces, a set of fan power negative line interfaces, a set of fan rotating speed control interfaces PWM and a set of fan rotating speed feedback interfaces FG. One fan power positive line interface, one fan power negative line interface, one fan rotating speed control interface and one fan rotating speed feedback interface of the interface unit 3 are connected to the system control unit 1 and the fan unit 2. The system control module 12 is connected to the fan control circuit 24 by the signal line and the fan rotating speed control interface of the interface unit 3 to send the given rotating speed signal to the fan control circuit 24.

[0037] Figure 3 A turning judgment circuit 23 that can be used in the present embodiment is shown. Referring to Figure 3 As shown, the turning judgment circuit 23 includes a comparison circuit, including an operational amplifier U, a resistor R1, and a resistor R2, the resistors R1 and R2 being connected in series, the resistor R1 being connected to a first power supply line P1, the resistor R2 being grounded, a middle node of the resistors R1 and R2 being connected to one input terminal of the operational amplifier U, the other input terminal of the operational amplifier U being connected to a threshold circuit, and an output terminal of the operational amplifier U being connected to the fan control circuit 24 through a signal line S4. It should be noted that the turning judgment circuit 23 can also use a comparison judgment circuit known in the art.

[0038] The system control module 12, the fan driving circuit 21, the fan power supply circuit 22, the fan control circuit 24, and the fan rotating speed detection circuit 25 are not the key points of the present application in terms of their structures, and can use chip modules or circuits known in the art that have corresponding functions. The auxiliary power supply circuit 11 converts an external power supply into a power supply form required by each part of the control device. The system control module 12 provides a control signal for the fan operation and receives a fan operation state signal to make a fault logic judgment. The fan power supply circuit 22 provides power supply for the judgment circuit and the fan control circuit 24. The turning judgment circuit 23 outputs a fan forward / reverse rotation signal to the fan control circuit 24 by judging the power supply voltage. The fan rotating speed detection circuit 25 outputs a real-time rotating speed signal to the fan control circuit 24. The fan control circuit 24 outputs a fan control signal to the fan driving circuit 21 according to a given rotating speed signal, a forward / reverse rotation control signal, and a rotating speed feedback signal after logic judgment. The fan driving circuit 21 outputs a fan driving power supply to the fan motor according to the control signal to drive the fan to realize forward / reverse rotation operation. The turning judgment circuit 23 outputs a fan forward rotation signal when the power supply voltage is greater than a first threshold value, and outputs a fan reverse rotation signal when the power supply voltage is less than a second threshold value. The fan power supply voltage variation is used to transfer the forward / reverse rotation control signal by adjusting the given value of the auxiliary power supply.

[0039] As shown in the specification and claims, the term "comprising" only indicates the inclusion of the steps and elements explicitly identified, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The term "and / or" used herein includes any combination of one or more related listed items.

[0040] It can be further understood that "multiple" in the present disclosure means two or more, and other quantifiers are similar.

[0041] It should be noted that, unless otherwise specified, when a certain feature is referred to as being "connected" to another feature, it can be directly connected to the other feature, or indirectly connected to the other feature through another feature.

[0042] The above embodiment is only for illustrating the technical concept and characteristics of the present application, is a preferred embodiment, the purpose is that the person skilled in the art can understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the principle of the present application should be covered within the protection scope of the present application.

Claims

1. A fan control device of an inverter, comprising a system control unit and a fan unit, characterized in that the system control unit comprising an auxiliary power supply circuit for sending a first level signal and a second level signal to the fan unit, the fan unit comprising: a rotation judging circuit connected with the auxiliary power supply circuit through a first power line to send a forward rotation control signal from the first level signal or a reverse rotation control signal from the second level signal; a fan control circuit connected with the rotation judging circuit through a signal line to send a fan control signal from the forward rotation control signal or the reverse rotation control signal; a fan driving circuit connected with the fan control circuit through a signal line, the fan driving circuit having an output end for connecting a fan.

2. The fan control device of claim 1, wherein the system control unit further comprising a system control module connected with the auxiliary power supply circuit through an output voltage switching signal line to send a given output voltage signal to the auxiliary power supply circuit.

3. The fan control device of claim 2, wherein the auxiliary power supply circuit comprising an auxiliary power supply main circuit having an isolation transformer, an output winding of the isolation transformer being connected with the first power line.

4. The fan control device of claim 3, wherein an input winding of the isolation transformer being connected with a second power line to access an external power supply; the output voltage switching signal line being connected with a given output voltage switching circuit, the given output voltage switching circuit being connected with a control and driving circuit of the isolation transformer through a signal line.

5. The fan control device of claim 2, wherein the auxiliary power supply circuit further comprising a buck circuit, one end of the buck circuit being connected with the first power line, the other end of the buck circuit being connected with the system control module through a third power line to supply power to the system control module.

6. The fan control device of claim 2, wherein the system control module being connected with the fan control circuit through a signal line to send a given rotation speed signal to the fan control circuit.

7. The fan control device of claim 1, wherein the fan driving circuit being connected with the first power line; the fan unit further comprising a fan power supply circuit, the fan power supply circuit being connected with the first power line and connected with the rotation judging circuit, the fan control circuit and the fan driving circuit through a fourth power line.

8. The fan control device of claim 1, wherein the fan unit further comprising a fan rotation speed detecting circuit, the fan rotation speed detecting circuit being connected with the rotation judging circuit and the fan control circuit through a signal line.

9. The fan control device according to any one of claims 1 to 8, characterized by the fan control device further comprising an interface unit, the interface unit having a set of fan power supply positive line interfaces, a set of fan power supply negative line interfaces, a set of fan rotation speed control interfaces and a set of fan rotation speed feedback interfaces, one fan power supply positive line interface, one fan power supply negative line interface, one fan rotation speed control interface and one fan rotation speed feedback interface of the system control unit and the interface unit being connected, one fan power supply positive line interface, one fan power supply negative line interface, one fan rotation speed control interface and one fan rotation speed feedback interface of the fan unit and the interface unit being connected.

10. An inverter, characterized by comprising: The fan control device according to any one of claims 1 to 9, wherein a fan is provided inside or outside a case of the inverter, and the fan driving circuit of the fan control device is connected to a motor of the fan through a fifth power supply line.

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