Power supply system of variable frequency air compressor

Abstract

The utility model provides a power supply system of a variable-frequency air compressor. The power supply system of the variable-frequency air compressor comprises a control module, a transformer, a first switch module and a standby power supply. The control module is connected with the transformer and the first switch module. The transformer is connected with the first switch module and is used for being connected with a power grid. And the standby power supply is connected with the control module and is used for being connected with a variable-frequency air compressor. And the control module is configured to respectively control the working state of the first switch module and the working state of the standby power supply according to the output voltage of the transformer. The first switch module is used for being connected with the variable frequency air compressor. The power supply stability of the variable frequency air compressor can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of power supply for air compressors, and particularly to a power supply system for a variable-frequency air compressor. Background Art

[0002] With the development of science and technology, air compressors play an increasingly important role in modern production and life. The increasing uses of air compressors have led to more and more application scenarios, and thus more problems for air compressors. In some large construction sites, the air compressors are large in size and volume, making it difficult and time-consuming to move them. Also, the air compressors are located far from the power grid, which easily causes voltage drops and affects the operating power of the air compressors. Summary of the Utility Model

[0003] Embodiments of the present disclosure provide a power supply system for a variable-frequency air compressor to solve the problem of unstable power supply for the variable-frequency air compressor.

[0004] In a first aspect, embodiments of the present disclosure provide a power supply system for a variable-frequency air compressor, including:

[0005] A control module, a transformer, a first switch module, and a backup power supply;

[0006] The control module is respectively connected to the transformer and the first switch module;

[0007] The transformer is connected to the first switch module and is used to be connected to the power grid;

[0008] The backup power supply is connected to the control module and is used to be connected to the variable-frequency air compressor;

[0009] The control module is configured to respectively control the working states of the first switch module and the backup power supply according to the output voltage of the transformer;

[0010] The first switch module is used to be connected to the variable-frequency air compressor.

[0011] In an exemplary embodiment of the present disclosure, the control module includes:

[0012] A first selector and a second selector;

[0013] For the first selector, the sl end is connected to the transformer, and the out end is connected to the sl end of the second selector; the out end of the second selector is connected to the backup power supply.

[0014] In an exemplary embodiment of the present disclosure, the power supply system for a variable-frequency air compressor further includes:

[0015] An alarm module;

[0016] The alarm module is connected to the control module.

[0017] The alarm module includes a buzzer and an LED light, and both the buzzer and the LED light are connected to the out terminal of the first selector of the control module.

[0018] In an exemplary embodiment of the present disclosure, the power supply system of the variable frequency air compressor further includes:

[0019] A signal feedback module;

[0020] The signal feedback module is connected to the control module;

[0021] The signal feedback module includes a signal receiving unit, a conversion unit, and an output unit;

[0022] For the signal receiving unit, the first end is connected to the transformer, and the second end is connected to the first end of the conversion unit;

[0023] The second end of the conversion unit is connected to the first end of the output unit;

[0024] The second end of the output unit is connected to the sl terminal of the first selector.

[0025] In an exemplary embodiment of the present disclosure, the power supply system of the variable frequency air compressor further includes:

[0026] A detection module;

[0027] The detection module is connected to the signal feedback module;

[0028] The detection module includes a voltage detector, the first end of which is connected to the transformer, and the second end is connected to the first end of the signal receiving unit in the signal feedback module.

[0029] In an exemplary embodiment of the present disclosure, the power supply system of the variable frequency air compressor includes:

[0030] A voltage amplification module;

[0031] The voltage amplification module is connected to the detection module;

[0032] The voltage amplification module includes a voltage amplification circuit, the first end of which is connected to the transformer, and the second end is connected to the first end of the voltage detector in the detection module.

[0033] In an exemplary embodiment of the present disclosure, the power supply system of the variable frequency air compressor further includes:

[0034] A second switch module;

[0035] The second switch module has its first end connected to the backup power supply, its second end for connecting to the variable frequency air compressor, and its third end connected to the control module.

[0036] In an exemplary embodiment of the present disclosure, the power supply system of a variable frequency air compressor further includes:

[0037] The first switch module

[0038] The first switch module includes a first intelligent single-pole single-throw switch;

[0039] For the first intelligent single-pole single-throw switch, its first end is connected to the transformer, its second end is connected to the variable frequency air compressor, and its third end is connected to the control module.

[0040] The beneficial effects of the power supply system of a variable frequency air compressor provided by the embodiments of the present disclosure are as follows:

[0041] Compared with the prior art, the power supply system of a variable frequency air compressor in this application has a detection module, a control module, a transformer, a control switch module, and a backup power supply, which can avoid the voltage drop problem caused by too long a circuit. Moreover, in the present disclosure, a detection module and a control module are provided in front of the variable frequency transformer. By detecting the voltage in the circuit, the boost amplitude of the transformer can be accurately regulated.

[0042] In addition, through the control switch module, the present disclosure controls the working states of the transformer and the backup power supply. When the output voltage of the transformer is different from the predetermined voltage, the transformer does not output voltage, and the backup power supply outputs voltage, ensuring the stability of the voltage input to the inverter, and thus improving the working efficiency of the air compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 is a schematic structural diagram of a power supply system of a variable frequency air compressor provided by an embodiment of the present disclosure;

[0045] Figure 2 is a schematic structural diagram of another power supply system of a variable frequency air compressor provided by an embodiment of the present disclosure;

[0046] Figure 3 is a schematic structural diagram of yet another power supply system of a variable frequency air compressor provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand this solution, the following will clearly describe the technical solution in the embodiments of this solution in conjunction with the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are part of the embodiments of this solution, rather than all of the embodiments. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this solution.

[0048] The term "including" in the specification, claims and the above-mentioned accompanying drawings of this solution, as well as any other variations, means "including but not limited to", and is intended to cover non-exclusive inclusion, not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish different objects, rather than to describe a specific order.

[0049] The following will describe the implementation of the present disclosure in detail with reference to specific accompanying drawings:

[0050] As the application of variable frequency air compressors becomes more and more widespread, the power supply for variable frequency air compressors has become increasingly important, so the following technical means are adopted. Figure 1 The following is a schematic structural diagram of a power supply system for a variable frequency air compressor provided in an embodiment of the present disclosure. Refer to Figure 1 and this power supply system for a variable frequency air compressor includes:

[0051] A control module 11, a transformer 12, a first switch module 13, and a backup power supply 14;

[0052] The control module 11 is respectively connected to the transformer 12 and the first switch module 13;

[0053] The transformer 12 is connected to the first switch module 13 and is used to connect to the power grid 10;

[0054] The backup power supply 14 is connected to the control module 11 and is used to connect to the variable frequency air compressor 15;

[0055] The control module 11 is configured to control the working states of the first switch module 13 and the backup power supply 14 respectively according to the output voltage of the transformer 12.

[0056] The first switch module 13 is used to connect to the variable frequency air compressor 15.

[0057] The transformer 12 is used for voltage compensation. Since the power grid 10 has a long line and is prone to voltage drop, the transformer 12 is connected between the power grid 10 and the variable frequency air compressor 15, which can play a certain role in boosting the voltage. The control module 11 regulates the working states of the first switch module 13 and the backup power supply 14 according to the output voltage of the transformer 12.

[0058] The control module 11 can collect the output voltage of the transformer after compensation, and output corresponding control instructions according to the output voltage to control the working state of the first switch module 13. Among them, the control instructions include a turn-on instruction and a turn-off instruction. The turn-on instruction is used to indicate that the first switch module 13 is in a conducting state, and the turn-off instruction is used to indicate that the first switch module 13 is in a disconnected state.

[0059] The first switch module 13 is in a disconnected state before receiving the turn-on instruction from the control module 11. If the control module 11 detects that the output voltage of the transformer 12 after compensation is a preset voltage, it sends a turn-on instruction to the first switch module 13. After receiving the turn-on instruction, the first switch module 13 adjusts to the conducting state. At this time, the output voltage of the transformer 12 can enable the variable frequency air compressor 15 to work stably.

[0060] If the control module 11 does not detect the output voltage of the transformer or detects that the output voltage of the transformer after compensation is not the preset voltage, it sends a turn-off instruction to the first switch module 13 and a start instruction to the backup power supply 14. After receiving the turn-off instruction, the first switch module 13 remains in the disconnected state or adjusts to the disconnected state. After receiving the start instruction, the backup power supply 14 starts to output the preset voltage to the variable frequency air compressor 15, and the backup power supply 14 remains in the off state when it does not receive an instruction.

[0061] The embodiment of the present utility model can realize the switching of the power supply of the variable frequency air compressor 15 between the backup power supply 14 and the power grid 10, so that the variable frequency air compressor 15 can work stably without being affected by the line voltage drop, and the working reliability of the variable frequency air compressor 15 is improved.

[0062] The added transformer 12 reduces the requirements for the working location of the variable frequency air compressor 15, and it can work normally even in places far from the power grid 10. The backup power supply 14 continuously transmits power to the variable frequency air compressor 15 when the input voltage of the transformer 12 is unstable or there is a power outage, ensuring the stability of the working state of the variable frequency air compressor 15.

[0063] In one embodiment, since the existing control module is relatively complex and the usage cost is relatively high, the following technical means are adopted. Figure 2 FIG. is a schematic structural diagram of another power supply system for a variable frequency air compressor provided by an embodiment of the present disclosure. Figure 3 FIG. is a schematic structural diagram of still another power supply system for a variable frequency air compressor provided by an embodiment of the present disclosure. Refer to Figure 2 、 Figure 3 The control module 11 includes:

[0064] A first selector 111 and a second selector 112;

[0065] The first selector 111, with its sl terminal connected to the transformer 12 and its out terminal connected to the sl terminal of the second selector 112; the out terminal of the second selector 112 is connected to the backup power supply 14.

[0066] The a terminals of both the first selector 111 and the second selector 112 are defaulted to low level, and the b terminals are defaulted to high level. If a high level is input to the sl terminals of the first selector 111 and the second selector 112, the out terminals of the first selector 111 and the second selector 112 output the a terminal level, that is, low level. If a low level is input to the sl terminals of the first selector 111 and the second selector 112, the out terminals of the first selector 111 and the second selector 112 output the b terminal level, that is, high level.

[0067] When the sl terminal of the first selector 111 is at high level, the out terminal is at low level, and the out terminal of the second selector 112 is at high level; when the sl terminal of the first selector 111 is at low level, the out terminal is at high level, and the out terminal of the second selector 112 is at low level.

[0068] When the out terminal of the first selector 111 outputs a high level, the first switch module maintains or adjusts to the on state. When the out terminal of the first selector 111 outputs a low level, the first switch module maintains or adjusts to the off state.

[0069] In one embodiment, since the worker cannot timely know whether the power supply of the variable-frequency air compressor at this time is the power grid or the backup power supply, the following technical means are adopted. Refer to Figure 3 , the power supply system of the variable-frequency air compressor further includes an alarm module 16;

[0070] The alarm module 16 includes a buzzer 161 and an LED lamp 162;

[0071] Both the buzzer 161 and the LED lamp 162 are connected to the out terminal of the first selector 111.

[0072] The buzzer 161 is used to emit a sound, and the LED lamp 162 is used to emit a light.

[0073] Specifically, the buzzer 161 and the LED lamp 162 do not work after receiving the low level of the second selector 112 and work after receiving the high level of the second selector 112.

[0074] The buzzer 161 and the LED lamp 162 can warn the staff about the voltage provided by the transformer 12 in terms of both sound and light effects. After hearing the sound of the buzzer 161 or seeing the light effect of the LED lamp 162, it indicates that the output voltage of the transformer 12 is not the preset voltage, and there may be a fault in the transformer 12. After not hearing the sound of the buzzer 161 or not seeing the light effect of the LED lamp 162, it indicates that the output voltage of the transformer 12 is the preset voltage.

[0075] In one embodiment, since the preset voltage signal is prone to errors during data transmission, resulting in an error between the actual voltage signal and the preset signal voltage, and ultimately affecting the switching between the backup power supply 14 and the power grid 10, the following technical means are adopted. Refer to Figure 3 , the power supply system of the variable frequency air compressor further includes a signal feedback module 17;

[0076] The signal feedback module 17 includes a signal receiving unit 171, a conversion unit 172, and an output unit 173;

[0077] The signal receiving unit 171 has its first end connected to the third end of the transformer 12 and its second end connected to the first end of the conversion unit 172;

[0078] The second end of the conversion unit 172 is connected to the first end of the output unit 173;

[0079] The second end of the output unit 173 is connected to the sl end of the first selector 111.

[0080] The signal receiving unit 171 is used to receive the information of the detection module 19. The conversion unit 172 converts the voltage signal into a high level or a low level, and the output unit 173 outputs the level signal.

[0081] Specifically, after the signal receiving unit 171 receives the signal of the detection module 19, the conversion unit 172 converts the voltage signal into two types. If the voltage signal is converted from the preset voltage, it is converted into a low level. If the voltage signal is not converted from the preset voltage, it is converted into a high level. The high level or the low level is output to the sl end of the first selector 111 through the output unit 173.

[0082] The signal feedback module 17 simplifies the voltage signal into two signals, a high level and a low level, through the signal receiving unit 171, the conversion unit 172, and the output unit 173.

[0083] After the voltage signal is converted into a high level and a low level, it simplifies the complexity of the subsequent operation of the control module 11. The hardware conversion can reduce the signal transmission error.

[0084] In one embodiment, since the voltage signal cannot be accurately measured, the following technical means are adopted. Refer toFigure 2 The power supply system of the variable frequency air compressor 15 includes a detection module 19;

[0085] The detection module 19 is connected to the signal feedback module 17;

[0086] The detection module 19 includes a voltage detector 191. The first end of the voltage detector 191 is connected to the transformer 12, and the second end is connected to the first end of the signal receiving unit 171 in the signal feedback module 17.

[0087] The voltage detector 191 is used to detect the voltage of the power grid 10.

[0088] After receiving the voltage output by the voltage amplifier 201, the voltage detector 191 detects this voltage.

[0089] After voltage detection, it is convenient for subsequent processing of voltage signals.

[0090] In one embodiment, since tiny voltage signals cannot be accurately measured, the following technical means are adopted. Refer to Figure 2 , the power supply system of the variable frequency air compressor includes:

[0091] A voltage amplification module 20;

[0092] The voltage amplification module 20 includes a voltage amplification circuit 201. The first end of the voltage amplification circuit 201 is connected to the third end of the transformer 12, and the second end is connected to the first end of the voltage detector 201.

[0093] The voltage amplification circuit 201 is used to amplify the voltage of the power grid 10 and transmit the amplified voltage to the detection module 19.

[0094] Amplifying the voltage of the power grid 10 can amplify tiny voltage differences and facilitate detection.

[0095] In one embodiment, since the backup power supply 14 generally does not have an automatic control switch, the following technical means are adopted. Refer to Figure 2 , the power supply system of the variable frequency air compressor includes:

[0096] The second switch module 18 is used to receive the signal from the control module 11 and change the switch state.

[0097] Specifically, after receiving the high-level signal from the second selector 112, the second switch module 18 enters the on state. After receiving the low-level signal from the second selector 112, it enters the off state. When no signal is received, it is in the on state. The second switch module 18 is in the off state when no signal is received.

[0098] The second switch module 18 enables automatic control of the switch of the backup power supply 14.

[0099] The second switch module 18 enables the power supply system to more conveniently regulate the working state of the backup power supply 14. The control of the first switch module 13 and the second switch module 18 by the control module 11 enables the input power of the variable frequency air compressor 15 to be accurately switched between the power grid 10 and the backup power supply 14, improving the intelligence level of the system.

[0100] In one embodiment, since the first switch module 13 needs to automatically control the switch according to the signal of the control module 11, the following technical means are adopted. Refer to Figure 2 , the power supply system of the variable frequency air compressor includes:

[0101] The first switch module 13 includes a first intelligent single-pole single-throw switch;

[0102] For the first intelligent single-pole single-throw switch, the first end is connected to the second end of the transformer 12, the second end is connected to the first end of the variable frequency air compressor 15, and the third end is connected to the second end of the control module 11.

[0103] The voltage amplification module 20 is used to receive the output voltage of the transformer 12, and the voltage amplification circuit 201 amplifies the voltage signal. The detection module 19 is used to detect voltage data. The signal feedback module 17 is used to sort out the detected voltage signal and transmit the processed electrical signal to the control module 11. The warning module 16 is used to give an alarm when the output voltage of the transformer 12 is unstable. The second switch module 18 is used to control the switch of the backup power supply 14.

[0104] Specifically, after the output voltage of the transformer 12 enters the voltage amplification module 20, the voltage is amplified by the voltage amplification circuit 201, and the amplified voltage is received by the signal receiving unit 191, and the conversion unit 192 converts the voltage signal into two types.

[0105] If the voltage signal is converted from 220V voltage, it is converted into a low level; if the voltage signal is not converted from 220V voltage, it is converted into a high level.

[0106] The high level or the low level is output to the sl end of the first selector 111 through the output unit 193.

[0107] If the sl end of the first selector 111 is at a high level, at this time, the out end of the first selector 111 outputs a low level at the a end. After receiving the low level, the first switch module 13 does not work. After receiving the low level, the second selector 112 outputs a high level at the b end, the second switch module 18 is turned on, the buzzer 161 gives an alarm, and the LED light 162 lights up.

[0108] If the sl terminal of the first selector 111 is at a low level, the out terminal of the first selector 111 outputs the high level of the b terminal at this time. After receiving the high level, the first switch module 13 works. After receiving the high level, the second selector 112 outputs the low level of the a terminal, and the second switch module 18 is turned on. The buzzer 161 does not give an alarm and the LED light 162 does not light up. The alarm module 16 defaults to the non-working state when it does not receive a signal, and the second switch module 18 defaults to the on state when it does not receive a signal.

[0109] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A power supply system for a variable frequency air compressor, characterized in that: include: Control module, transformer, first switch module, backup power supply; The control module is connected to the transformer and the first switch module respectively; The transformer is connected to the first switch module and is used to connect to a power grid; The backup power supply is connected to the control module and is used to connect to the variable frequency air compressor; The control module is configured to control the working state of the first switch module and the working state of the backup power supply respectively according to the output voltage of the transformer; The first switch module is used to connect to the variable frequency air compressor.

2. A power supply system for a variable frequency air compressor as claimed in claim 1, characterized in that: The control module includes a first selector and a second selector; The first selector, the s1 end is connected to the transformer, and the out end is connected to the s1 end of the second selector; the out end of the second selector is connected to the backup power supply.

3. A power supply system for a variable frequency air compressor as claimed in claim 2, characterized in that Also includes: Alarm module; The alarm module is connected to the control module.

4. A power supply system for a variable frequency air compressor as claimed in claim 2, characterized in that: Also includes: Signal feedback module; The signal feedback module is connected to the control module; The signal feedback module includes a signal receiving unit, a conversion unit and an output unit; The signal receiving unit has a first end connected to the transformer and a second end connected to the first end of the conversion unit; The second end of the conversion unit is connected to the first end of the output unit; The second terminal of the output unit is connected to the s1 terminal of the first selector.

5. A power supply system for a variable frequency air compressor as claimed in claim 4, characterized in that: Also includes: Detection module; The detection module is connected to the signal feedback module; The detection module comprises a voltage detector, a first end of the voltage detector is connected to the transformer, and a second end of the voltage detector is connected to a first end of a signal receiving unit in the signal feedback module.

6. A power supply system for a variable frequency air compressor as claimed in claim 5, characterized in that: Also includes: Voltage amplifier module; The voltage amplification module is connected to the detection module; The voltage amplification module comprises a voltage amplification circuit, wherein a first end of the voltage amplification circuit is connected to the transformer, and a second end of the voltage amplification circuit is connected to a first end of a voltage detector in the detection module.

7. A power supply system for a variable frequency air compressor as claimed in claim 1, characterized in that: Also includes a second switch module; The second switch module has a first end connected to the backup power supply, a second end used to be connected to the variable frequency air compressor, and a third end connected to the control module.

8. The power supply system of a variable frequency air compressor according to claim 1, characterized in that: The first switch module includes a first intelligent single-pole single-throw switch; The first intelligent single-pole single-throw switch has a first end connected to the transformer, a second end connected to the variable frequency air compressor, and a third end connected to the control module.

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