CN110971172A - Control circuit of compressor - Google Patents
Control circuit of compressor Download PDFInfo
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- CN110971172A CN110971172A CN201811165188.XA CN201811165188A CN110971172A CN 110971172 A CN110971172 A CN 110971172A CN 201811165188 A CN201811165188 A CN 201811165188A CN 110971172 A CN110971172 A CN 110971172A
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- compressor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention discloses a control circuit of a compressor, comprising: the input end of the rectifying circuit is connected with an alternating current power supply, and the rectifying circuit is used for rectifying alternating current output by the alternating current power supply to output pulsating direct current to supply to the compressor; the input end of the filter circuit is connected with the output end of the rectifying circuit, and the filter circuit is used for filtering the pulsating direct current; the input end of the inverter is connected with the output end of the filter circuit, and the output end of the inverter is connected with the compressor; and the voltage doubling switching circuit is respectively connected with the rectifying circuit, the filter circuit and the alternating current power supply and is used for adjusting the power supply bus voltage of the compressor according to the running frequency of the compressor so as to improve the energy efficiency of the compressor. The control circuit adjusts the voltage of the compressor power supply bus through the voltage doubling switching circuit according to the difference of the operating frequency of the compressor, so that the energy efficiency of each frequency band of the compressor can be improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a control circuit of a compressor.
Background
The inverter compressor has the advantages of electricity saving, high energy efficiency, low noise and the like, and is approved by broad users. The improvement of the energy efficiency of the air conditioner mainly aims to improve the energy efficiency of the compressor, and therefore, how to improve the energy efficiency of the compressor is widely researched.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a control circuit of a compressor, which can realize the adjustment of the voltage of a power supply bus of the compressor under different compressor operation frequencies, thereby improving the energy efficiency of each frequency band of the compressor.
In order to achieve the above object, the present invention provides a control circuit of a compressor, including: the input end of the rectifying circuit is connected with an alternating current power supply, and the rectifying circuit is used for rectifying alternating current output by the alternating current power supply to output pulsating direct current to be supplied to the compressor; the input end of the filter circuit is connected with the output end of the rectifying circuit, and the filter circuit is used for filtering the pulsating direct current; the input end of the inverter is connected with the output end of the filter circuit, and the output end of the inverter is connected with the compressor; the voltage doubling switching circuit is respectively connected with the rectifying circuit, the filter circuit and the alternating current power supply, and is used for adjusting the power supply bus voltage of the compressor according to the running frequency of the compressor so as to improve the energy efficiency of the compressor.
According to the control circuit of the compressor, the voltage value of the power supply bus of the compressor is adjusted through the voltage doubling switching circuit according to different running frequencies of the compressor, so that the energy efficiency of each frequency band of the compressor can be improved, and the control circuit is simple in structure and low in implementation cost.
In addition, the control circuit of the compressor according to the embodiment of the present invention may further have the following additional technical features:
according to one embodiment of the present invention, the rectifier circuit includes a first diode, a second diode, a third diode, and a fourth diode, wherein a cathode of the first diode is connected to an anode of the second diode and forms a first node; the cathode of the second diode is connected with the cathode of the fourth diode and forms a second node; the anode of the fourth diode is connected with the cathode of the third diode and forms a third node; the anode of the third diode is connected with the anode of the first diode and forms a fourth node; one end of the alternating current power supply is connected with the first node, and the other end of the alternating current power supply is connected with the third node.
According to an embodiment of the present invention, the filter circuit includes: one end of the first capacitor is connected with the second node, and the other end of the first capacitor is connected with the voltage-multiplying switching circuit; one end of the second capacitor is connected with the voltage-multiplying switching circuit, and the other end of the second capacitor is connected with the fourth node; and one end of the third capacitor is connected with the second node, and the other end of the third capacitor is connected with the fourth node.
According to an embodiment of the present invention, the voltage-doubling switching circuit includes: a first end of the first controllable switch is connected with one end of the second capacitor, a second end of the first controllable switch is connected with the second node, and a third end of the first controllable switch is connected with the third node; and one end of the second controllable switch is connected with one end of the second capacitor, and the other end of the second controllable switch is connected with the other end of the first capacitor.
According to one embodiment of the present invention, the first controllable switch is a single-pole double-throw switch, the first terminal of the first controllable switch is a stationary terminal of the single-pole double-throw switch, and the second terminal and the third terminal of the first controllable switch are two moving terminals of the single-pole double-throw switch.
According to an embodiment of the present invention, the voltage-doubling switching circuit further includes: the first controller is used for controlling the first end of the first controllable switch to be connected with the third end when a high-frequency control instruction is received in the low-frequency operation process of the compressor, controlling the second controllable switch to be closed after delaying for a first preset time so as to improve the energy efficiency of the compressor in the high-frequency operation process, controlling the second controllable switch to be opened when a low-frequency control instruction is received in the high-frequency operation process of the compressor, and controlling the first end of the first controllable switch to be connected with the second end after delaying for a second preset time so as to improve the energy efficiency of the compressor in the low-frequency operation process.
According to an embodiment of the present invention, the voltage-doubling switching circuit includes: a first relay, a first contact of which is connected with one end of the second capacitor, a second contact of which is connected with the second node, a third contact of which is connected with the third node, one end of a control coil of which is connected with a preset power supply, the first contact of which is a common end, the second contact of which is a normally closed end, and the third contact of which is a normally open end; a first end of the first switch tube is connected with the other end of the control coil of the first relay, and a second end of the first switch tube is grounded; a first contact of the second relay is connected with one end of the second capacitor, a second contact of the second relay is connected with the other end of the first capacitor, and one end of a control coil of the second relay is connected with the preset power supply; a first end of the second switch tube is connected with the other end of the control coil of the second relay, and a second end of the second switch tube is grounded; the second controller is used for controlling the first contact and the third contact of the first relay to be connected when a high-frequency control instruction is received in the low-frequency operation process of the compressor, and controlling the second relay to be closed after delaying the first preset time so as to enable the compressor to operate at a high frequency, and controlling the second relay to be disconnected when a low-frequency control instruction is received in the high-frequency operation process of the compressor, and controlling the first contact and the second contact of the first relay to be connected after delaying the second preset time so as to enable the compressor to operate at a low frequency.
According to an embodiment of the present invention, the voltage-doubling switching circuit further includes: the anode of the fifth diode is respectively connected with the other end of the control coil of the first relay and the first end of the first switching tube, and the cathode of the fifth diode is connected with the preset power supply; and the anode of the sixth diode is respectively connected with the other end of the control coil of the second relay and the first end of the second switching tube, and the cathode of the sixth diode is connected with the preset power supply.
According to one embodiment of the invention, the voltage of the preset power supply is + 12V.
According to an embodiment of the present invention, the first switch tube and the second switch tube are transistors or MOS tubes.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a block diagram of a control circuit of a compressor according to an embodiment of the present invention;
fig. 2 is a schematic configuration diagram of a control circuit of a compressor according to an embodiment of the present invention;
fig. 3 is a schematic configuration diagram of a control circuit of a compressor according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A control circuit of a compressor of an embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a control circuit of a compressor according to an embodiment of the present invention.
As shown in fig. 1, the control circuit 100 of the compressor includes a rectifying circuit 110, a filter circuit 120, an inverter 130, and a voltage-doubling switching circuit 140.
Referring to fig. 1, a rectifier circuit 10 has an input terminal connected to an AC power source AC, and a rectifier circuit 110 is used to rectify AC power output from the AC power source AC to output pulsating dc power to supply the compressor M. The input end of the filter circuit 120 is connected to the output end of the rectifier circuit 110, and the filter circuit 120 is used for filtering the pulsating direct current. An input terminal of the inverter 130 is connected to an output terminal of the filter circuit 120, and an output terminal of the inverter 130 is connected to the compressor M. The voltage doubling switching circuit 140 is respectively connected to the rectifying circuit 110, the filter circuit 120 and the AC power supply AC, and the voltage doubling switching circuit 140 is configured to adjust a power supply bus voltage of the compressor M according to an operating frequency of the compressor M, so as to improve energy efficiency of the compressor M.
In this embodiment, the compressor M is an inverter compressor. The voltage doubling switching circuit 140 may adjust the voltage of the power supply bus of the compressor M on-line or off-line.
In one embodiment of the present invention, as shown in fig. 2 and 3, the rectifying circuit 110 includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, wherein a cathode of the first diode D1 is connected to an anode of the second diode D2 and forms a first node a 1; the cathode of the second diode D2 is connected to the cathode of the fourth diode D4 and forms a second node a 2; an anode of the fourth diode D4 is connected to a cathode of the third diode D3 and forms a third node a 3; an anode of the third diode D3 is connected to an anode of the first diode D1 and forms a fourth node a 4.
Referring to fig. 2 and 3, one end of an alternating current power AC is connected to the first node a1, and the other end of the alternating current power AC is connected to the third node a 3.
Further, as shown in fig. 2 and fig. 3, the filter circuit 120 includes a first capacitor E1, a second capacitor E2, and a third capacitor E3. One end of the first capacitor E1 is connected to the second node a2, and the other end of the first capacitor E1 is connected to the voltage-doubling switching circuit 140; one end of the second capacitor E2 is connected to the voltage-doubling switching circuit 140, and the other end of the second capacitor E2 is connected to the fourth node a 4; one terminal of the third capacitor E3 is connected to the second node a2, and the other terminal of the third capacitor E3 is connected to the fourth node a 4.
Specifically, the first capacitor E1, the second capacitor E2 and the third capacitor E3 may all be electrolytic capacitors, referring to fig. 2 and 3, an anode of the first capacitor E1 is connected to the second node a2, and a cathode of the first capacitor E1 is connected to the voltage-doubling switching circuit 140; the anode of the second capacitor E2 is connected to the voltage-doubling switching circuit 140, and the cathode of the second capacitor E2 is connected to the fourth node a 4; the anode of the third capacitor E3 is connected to the second node a2, and the cathode of the third capacitor E3 is connected to the fourth node a 4.
In this embodiment, the structure of the filter circuit 120 is not limited to include the first capacitor E1, the second capacitor E2, and the third capacitor E3, and for example, only the first capacitor E1 and the second capacitor E2 may be included, a fourth capacitor connected in parallel to the third capacitor, and the like may be included.
Further, in one example of the present invention, as shown in fig. 2, the voltage-doubling switching circuit 140 includes a first controllable switch K1 and a second controllable switch K2.
A first terminal of the first controllable switch K1 is connected to one terminal of the second capacitor E2, a second terminal of the first controllable switch K1 is connected to the second node a2, and a third terminal of the first controllable switch K1 is connected to the third node a 3; one end of the second controllable switch K2 is connected to one end of the second capacitor E2, and the other end of the second controllable switch K2 is connected to the other end of the first capacitor E1. The second controllable switch K2 is provided to prevent the first controllable switch K1 from switching to short-circuit the first capacitor E1.
Alternatively, the first controllable switch K1 can be a single-pole double-throw switch, the first terminal of the first controllable switch K1 is the stationary terminal of the single-pole double-throw switch, and the second terminal and the third terminal of the first controllable switch K1 are the two moving terminals of the single-pole double-throw switch.
In this example, as shown in fig. 2, the voltage-doubling switching circuit 140 may further include a first controller 141, where the first controller 141 is respectively connected to the control terminals of the first controllable switch K1 and the second controllable switch K2, and the first controller 141 is configured to, when receiving a high-frequency control instruction during the low-frequency operation of the compressor M, control the first terminal of the first controllable switch K1 to be connected to the third terminal, and control the second controllable switch K2 to be closed after delaying a first preset time, so as to improve the energy efficiency during the high-frequency operation of the compressor M, and, when receiving a low-frequency control instruction during the high-frequency operation of the compressor M, control the second controllable switch K2 to be opened, and control the first terminal of the first controllable switch K1 to be connected to the second terminal after delaying a second preset time, so as to improve the energy efficiency during the low-frequency operation of the compressor M.
Specifically, referring to fig. 2, when the compressor M is started, the compressor M runs at a low frequency, the first controllable switch K1 and the second controllable switch K2 are in a default state, that is, the first end and the second end of the first controllable switch K1 are connected, the second controllable switch K2 is in an off state, the power supply bus voltage of the compressor M is U, and the first capacitor E1 and the second capacitor E2 are charged. If the compressor M continues to increase to the target high frequency, at this time, the first controller 141 outputs a control signal to the control end of the first controllable switch K1 and the control end of the second controllable switch K2 to control the first end of the first controllable switch K1 to be switched to be connected with the third end, and after the first preset time is delayed, the second controllable switch K2 is controlled to be closed, the first capacitor E1 discharges, the voltage of the power supply bus of the compressor M increases to 2 times of the original voltage, which is 2 × U, so that the energy efficiency of the compressor M during high-frequency operation is improved. If the compressor M is down-converted when operating at a high frequency, when the frequency is reduced to a target low frequency, the first controller 141 outputs a control signal to the control end of the first controllable switch K1 and the control end of the second controllable switch K2 to control the second controllable switch K2 to be turned off, and controls the first end of the first controllable switch K1 to be switched to be connected with the second end after a second preset time is delayed, and the voltage of the power supply bus of the compressor M is reduced to U, so that the energy efficiency of the compressor M when operating at a low frequency is improved.
It should be noted that, when the operating frequency of the compressor M is low, the low-voltage is relatively high in energy efficiency because the dead time of the control is not changed and the switching loss of the low voltage is small; when the operating frequency of the compressor M is low, high pressure is less likely to enter weak magnetism, so that high pressure is higher than low pressure in energy efficiency.
In another example of the present invention, as shown in fig. 3, the voltage doubling switching circuit 140 includes a first relay RY1, a first switching tube Q1, a second relay RY2, a second switching tube Q2, and a second controller 142.
Referring to fig. 3, a first contact of the first relay RY1 is connected to one end of the second capacitor E2, a second contact of the first relay RY1 is connected to the second node a2, a third contact of the first relay RY1 is connected to the third node a3, one end of the control coil KM1 of the first relay RY1 is connected to the preset power supply VEE, the first contact of the first relay RY1 is a common end, the second contact of the first relay RY1 is a normally closed end, and the third contact of the first relay RY1 is a normally open end. A first end of the first switching tube Q1 is connected to the other end of the control coil KM1 of the first relay RY1, and a second end of the first switching tube Q1 is grounded. A first contact of the second relay RY2 is connected with one end of a second capacitor E2, a second contact of the second relay RY2 is connected with the other end of the first capacitor E1, and one end of a control coil KM2 of the second relay RY2 is connected with a preset power supply VEE. A first end of the second switching tube Q2 is connected to the other end of the control coil KM2 of the second relay RY2, and a second end of the second switching tube Q2 is grounded.
In this example, the second controller 142 is connected to the control end of the first switch tube Q1 and the control end of the second switch tube Q2, respectively, and the second controller 142 is configured to, when receiving a high-frequency control instruction during low-frequency operation of the compressor M, control the first contact and the third contact of the first relay RY1 to be connected, and control the second relay RY2 to be closed after delaying a first preset time, so as to improve the energy efficiency during high-frequency operation of the compressor M, and control the second relay RY2 to be opened when receiving a low-frequency control instruction during high-frequency operation of the compressor M, and control the first contact and the second contact of the first relay RY1 to be connected after delaying a second preset time, so as to improve the energy efficiency during low-frequency operation of the compressor M. Wherein, the voltage of the preset power supply may be + 12V.
Specifically, referring to fig. 3, when the compressor M is started, the compressor M runs at a low frequency, the first relay RY1 and the second relay RY2 are in a default state, that is, the first contact of the first relay RY1 is connected with the second contact, the second relay RY2 is in an open state, the power supply bus voltage of the compressor M is U, and the first capacitor E1 and the second capacitor E2 are charged. If the compressor M continues to increase to the target high frequency, at this time, the second controller 142 outputs a control signal to the control end of the first switch tube Q1 and the control end of the second switch tube Q2 to control the first contact of the first relay RY1 to be switched to be connected with the third contact, and after the first preset time is delayed, the second relay RY2 is controlled to be closed, the first capacitor E1 discharges, the voltage of the power supply bus of the compressor M increases to 2 times of the original voltage, which is 2 × U, and therefore the energy efficiency of the compressor M during high-frequency operation is improved. If the compressor M is in high-frequency operation and the frequency is reduced to a target low frequency, the second controller 142 outputs control signals to the control end of the first switch tube Q1 and the control end of the second switch tube Q2 to control the second relay RY2 to be disconnected, the first contact of the first relay RY1 is controlled to be switched to be connected with the second contact after the second preset time is delayed, the voltage of a power supply bus of the compressor M is reduced to U, and therefore the energy efficiency of the compressor M in low-frequency operation is improved.
Further, as shown in fig. 3, the voltage-doubling switching circuit 140 may further include a fifth diode D5 and a sixth diode D6. The anode of the fifth diode D5 is connected to the other end of the control coil KM1 of the first relay RY1 and the first end of the first switch tube Q1, respectively, and the cathode of the fifth diode D5 is connected to the preset power source VCC; an anode of the sixth diode D6 is connected to the other end of the control coil KM2 of the second relay RY2 and the first end of the second switching tube Q2, respectively, and a cathode of the sixth diode D6 is connected to the preset power source VCC.
In this example, the first switch tube Q1 and the second switch tube Q2 may be both transistors or MOS (metal oxide semiconductor) tubes. When the switching tube is a triode, the first end of the switching tube is a collector of the triode, the second end of the switching tube is an emitter of the triode, and the control end of the switching tube is a base of the triode; when the switch tube is an MOS tube, the first end of the switch tube is a drain electrode of the MOS tube, the second end of the switch tube is a source electrode of the MOS tube, and the control end of the switch tube is a grid electrode of the MOS tube.
In the embodiment of the present invention, the values of the first preset time and the second preset time may be set according to the actual operation condition of the compressor, and may be the same or different. Meanwhile, the setting of the delay time can prevent the first controllable switch K1 or the first relay RY1 from causing the first capacitor E1 to be short-circuited when switched.
In summary, the control circuit of the compressor according to the embodiment of the present invention adjusts the voltage value of the power supply bus of the compressor through the voltage doubling switching circuit according to the difference of the operating frequency of the compressor, so that the energy efficiency of each frequency band of the compressor can be improved, and the circuit has a simple structure and a low implementation cost.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control circuit of a compressor, comprising:
the input end of the rectifying circuit is connected with an alternating current power supply, and the rectifying circuit is used for rectifying alternating current output by the alternating current power supply to output pulsating direct current to be supplied to the compressor;
the input end of the filter circuit is connected with the output end of the rectifying circuit, and the filter circuit is used for filtering the pulsating direct current;
the input end of the inverter is connected with the output end of the filter circuit, and the output end of the inverter is connected with the compressor;
the voltage doubling switching circuit is respectively connected with the rectifying circuit, the filter circuit and the alternating current power supply, and is used for adjusting the power supply bus voltage of the compressor according to the running frequency of the compressor so as to improve the energy efficiency of the compressor.
2. The control circuit of a compressor according to claim 1, wherein the rectifying circuit includes a first diode, a second diode, a third diode, and a fourth diode, wherein,
the cathode of the first diode is connected with the anode of the second diode and forms a first node;
the cathode of the second diode is connected with the cathode of the fourth diode and forms a second node;
the anode of the fourth diode is connected with the cathode of the third diode and forms a third node;
the anode of the third diode is connected with the anode of the first diode and forms a fourth node;
one end of the alternating current power supply is connected with the first node, the other end of the alternating current power supply is connected with the third node, and the input end of the filter circuit is connected with the second node and the fourth node respectively.
3. The control circuit of a compressor according to claim 2, wherein the filter circuit comprises:
one end of the first capacitor is connected with the second node, and the other end of the first capacitor is connected with the voltage-multiplying switching circuit;
one end of the second capacitor is connected with the voltage-multiplying switching circuit, and the other end of the second capacitor is connected with the fourth node;
and one end of the third capacitor is connected with the second node, and the other end of the third capacitor is connected with the fourth node.
4. The control circuit of a compressor according to claim 3, wherein the voltage-doubling switching circuit includes:
a first end of the first controllable switch is connected with one end of the second capacitor, a second end of the first controllable switch is connected with the second node, and a third end of the first controllable switch is connected with the third node;
and one end of the second controllable switch is connected with one end of the second capacitor, and the other end of the second controllable switch is connected with the other end of the first capacitor.
5. The control circuit of the compressor according to claim 4, wherein the first controllable switch is a single-pole double-throw switch, the first terminal of the first controllable switch is a fixed terminal of the single-pole double-throw switch, and the second terminal and the third terminal of the first controllable switch are two movable terminals of the single-pole double-throw switch.
6. The control circuit of a compressor according to claim 4, wherein the voltage-doubling switching circuit further comprises:
the first controller is used for controlling the first end of the first controllable switch to be connected with the third end when a high-frequency control instruction is received in the low-frequency operation process of the compressor, controlling the second controllable switch to be closed after delaying for a first preset time so as to improve the energy efficiency of the compressor in the high-frequency operation process, controlling the second controllable switch to be opened when a low-frequency control instruction is received in the high-frequency operation process of the compressor, and controlling the first end of the first controllable switch to be connected with the second end after delaying for a second preset time so as to improve the energy efficiency of the compressor in the low-frequency operation process.
7. The control circuit of a compressor according to claim 3, wherein the voltage-doubling switching circuit includes:
a first relay, a first contact of which is connected with one end of the second capacitor, a second contact of which is connected with the second node, a third contact of which is connected with the third node, one end of a control coil of which is connected with a preset power supply, the first contact of which is a common end, the second contact of which is a normally closed end, and the third contact of which is a normally open end;
a first end of the first switch tube is connected with the other end of the control coil of the first relay, and a second end of the first switch tube is grounded;
a first contact of the second relay is connected with one end of the second capacitor, a second contact of the second relay is connected with the other end of the first capacitor, and one end of a control coil of the second relay is connected with the preset power supply;
a first end of the second switch tube is connected with the other end of the control coil of the second relay, and a second end of the second switch tube is grounded;
the second controller is used for controlling the first contact and the third contact of the first relay to be connected when a high-frequency control instruction is received in the low-frequency operation process of the compressor, and controlling the second relay to be closed after delaying the first preset time so as to enable the compressor to operate at a high frequency, and controlling the second relay to be disconnected when a low-frequency control instruction is received in the high-frequency operation process of the compressor, and controlling the first contact and the second contact of the first relay to be connected after delaying the second preset time so as to enable the compressor to operate at a low frequency.
8. The control circuit of a compressor according to claim 3, wherein the voltage-doubling switching circuit further comprises:
the anode of the fifth diode is respectively connected with the other end of the control coil of the first relay and the first end of the first switching tube, and the cathode of the fifth diode is connected with the preset power supply;
and the anode of the sixth diode is respectively connected with the other end of the control coil of the second relay and the first end of the second switching tube, and the cathode of the sixth diode is connected with the preset power supply.
9. The control circuit of a compressor according to claim 8, wherein the preset power source has a voltage of + 12V.
10. The control circuit of a compressor according to claim 7 or 8, wherein the first switching tube and the second switching tube are transistors or MOS tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811165188.XA CN110971172A (en) | 2018-09-30 | 2018-09-30 | Control circuit of compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811165188.XA CN110971172A (en) | 2018-09-30 | 2018-09-30 | Control circuit of compressor |
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| CN110971172A true CN110971172A (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811165188.XA Pending CN110971172A (en) | 2018-09-30 | 2018-09-30 | Control circuit of compressor |
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