CN107994791B - Three-phase rectification circuit, control method thereof and air conditioner - Google Patents
Three-phase rectification circuit, control method thereof and air conditioner Download PDFInfo
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- CN107994791B CN107994791B CN201711282873.6A CN201711282873A CN107994791B CN 107994791 B CN107994791 B CN 107994791B CN 201711282873 A CN201711282873 A CN 201711282873A CN 107994791 B CN107994791 B CN 107994791B
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/30—Conversion of ac power input into dc power output without possibility of reversal by dynamic converters
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Abstract
The invention provides a three-phase rectification circuit, a control method thereof and an air conditioner. Wherein, three-phase rectifier circuit includes: the alternating current input end of the three-phase rectification module comprises a first-phase alternating current input, a second-phase alternating current input and a third-phase alternating current input; the first alternating current contactor is connected to the direct current output end of the three-phase rectification module; the second alternating current contactor is connected with the first alternating current contactor in series; the anode of the first electrolytic capacitor is connected with the output end of the second alternating current contactor; and the second electrolytic capacitor is connected with the first electrolytic capacitor in series, and the negative electrode of the second electrolytic capacitor is connected to the direct current output end of the three-phase rectification module. By adopting the technical scheme of the invention, the situation that the electrolytic capacitor is exploded due to no protection when the electrolytic capacitors connected in series are in reverse phase in production or maintenance can be effectively avoided, and the situation that the partial pressure of the electrolytic capacitor is uneven after the air conditioner runs for a long time is prevented, so that the reliability of the three-phase rectification circuit is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a three-phase rectifying circuit, a control method of the three-phase rectifying circuit and an air conditioner.
Background
The condition that the electrolytic capacitor is exploded after being electrified is occasionally fed back by a machine newly installed in the market, and the detection results are caused by the reverse phase of the serial connection wire of the electrolytic capacitor or uneven voltage division. The wiring installation of the machine belongs to manual operation, and the situation that a capacitor is connected in series and a wrong wire is connected in production or maintenance can be inevitably caused, and the problem is very harmful to installation or maintenance personnel and also seriously influences the brand image.
The currently used three-phase rectification circuit is shown in fig. 1, BD-1 'is a three-phase rectification bridge stack, three-phase alternating current is changed into single-phase direct current, the output end of the three-phase rectification bridge stack is provided with a KMA' alternating current contactor, an energy storage electrolytic capacitor usually uses two series connection of E1 'and E2' due to the limitation of single voltage resistance, the circuit detection voltage only detects the left end and the right end behind the series connection capacitor, then the detection circuit converts the voltage into analog voltage, the analog voltage is sent to an AD port of a driving chip, and corresponding voltage values are read to judge whether the direct current voltage is normal or. The circuit only judges the total voltage of the electrolytic capacitors, and cannot judge whether a certain electrolytic capacitor is connected in series in an inverted mode, so that the problem is caused.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to provide a three-phase rectifier circuit.
Another aspect of the present invention is to provide a control method of a three-phase rectifier circuit.
Another aspect of the present invention is to provide an air conditioner.
In view of the above, the present invention provides a three-phase rectifier circuit, including: the alternating current input end of the three-phase rectification module comprises a first-phase alternating current input, a second-phase alternating current input and a third-phase alternating current input; the first alternating current contactor is connected to the direct current output end of the three-phase rectification module; the second alternating current contactor is connected with the first alternating current contactor in series; the anode of the first electrolytic capacitor is connected with the output end of the second alternating current contactor; and the second electrolytic capacitor is connected with the first electrolytic capacitor in series, and the negative electrode of the second electrolytic capacitor is connected to the direct current output end of the three-phase rectification module.
According to the three-phase rectification circuit, the first alternating current contactor is additionally arranged to control the on-off of the direct current output end of the three-phase rectification module, when an air conditioner works normally, after the first alternating current contactor receives corresponding control signals for attraction, the two electrolytic capacitors start to charge, after preset time (the time point that the electrolytic capacitors are approximately fully charged can be selected, such as 20S), the voltage value of a single electrolytic capacitor (the first electrolytic capacitor or the second electrolytic capacitor) is detected, and when the detected voltage value is normal, the second alternating current contactor is controlled for attraction, so that the two electrolytic capacitors are charged; when the detected voltage value is abnormal (the voltage value is lower or higher), the first alternating current contactor is disconnected, and the second alternating current contactor is controlled not to be attracted, so that the electrolytic capacitor is prevented from being continuously charged and damaged. The three-phase rectifier circuit can effectively avoid the situation that the electrolytic capacitor is exploded due to no protection when the series electrolytic capacitor is in reverse phase in the production stage or in market maintenance, and prevent the situation that the electrolytic capacitor has uneven partial pressure after the air conditioner runs for a long time, thereby improving the reliability of the three-phase rectifier circuit and increasing the protection of the air conditioner and users.
In addition, according to the three-phase rectification circuit of the present invention, the following additional technical features may be provided:
in the above technical solution, preferably, the method further includes: and the first voltage detection circuit is connected to two sides of the first electrolytic capacitor or two sides of the second electrolytic capacitor.
In the technical scheme, the first voltage detection circuit is connected to two sides of the first electrolytic capacitor or two sides of the second electrolytic capacitor instead of being connected to two sides of the first electrolytic capacitor and the second electrolytic capacitor which are connected in series, whether a certain electrolytic capacitor is connected in series reversely or voltage division is uneven can be judged by detecting whether the voltage value of a single electrolytic capacitor (namely the first electrolytic capacitor or the second electrolytic capacitor) is abnormal, and the first alternating current contactor is disconnected when the detected voltage value is abnormal, so that the electrolytic capacitor is prevented from being damaged by overvoltage.
In any of the above technical solutions, preferably, the method further includes: and the second voltage detection circuit is connected to any one of the alternating current input ends of the three-phase rectification module and two sides of a zero line of the three-phase rectification circuit.
In this technical solution, the second voltage detection circuit is configured to detect a voltage effective value of a zero line and a live line, specifically, detect a voltage effective value between any ac power input at an ac input end of the three-phase rectification module and a zero line of the three-phase rectification circuit. The voltage effective value can be used as a reference voltage and is compared with a voltage value detected by the first voltage detection circuit, so that whether the voltage value detected by the first voltage detection circuit is abnormal or not is judged, and when the voltage value is abnormal, the electrolytic capacitor is prevented from being damaged due to continuous charging by disconnecting the first alternating current contactor attracted at the front end.
In any of the above technical solutions, preferably, the method further includes: and the at least one thermistor is connected with the second alternating current contactor in parallel.
In the technical scheme, at least one thermistor and a second alternating current contactor are connected in parallel, during the period of power-on, the second alternating current contactor is in an off state, the charging current passes through the thermistor, and the thermistor plays a role in inhibiting current in a circuit, so that the current overshoot is prevented from damaging an electrolytic capacitor.
In any of the above solutions, preferably, the at least one thermistor includes a first thermistor and a second thermistor connected in series.
In this embodiment, it should be understood by those skilled in the art that the number of thermistors is not limited to 2, and one or more thermistors may be provided according to the requirement of the circuit, as long as the charging current overshoot can be avoided and the electrolytic capacitor can be prevented from being damaged.
In any of the above technical solutions, preferably, the method further includes: and the capacitor is connected in parallel at two ends of the first electrolytic capacitor and the second electrolytic capacitor which are connected in series.
In the technical scheme, the capacitors connected in parallel at two ends of the first electrolytic capacitor and the second electrolytic capacitor which are connected in series play a role in filtering, so that the stability and the reliability of the whole circuit are improved.
The invention also provides a control method of the three-phase rectification circuit, which comprises the following steps: after electrification, controlling a first alternating current contactor of the three-phase rectification circuit to be attracted, controlling a second alternating current contactor not to be attracted, and starting timing; after the first preset time, acquiring voltage values at two sides of the first electrolytic capacitor or two sides of the second electrolytic capacitor detected by the first voltage detection circuit; and controlling the first alternating current contactor to be disconnected or controlling the second alternating current contactor to be closed according to the voltage value.
According to the control method of the three-phase rectification circuit, when an air conditioner works normally, after a first alternating current contactor receives corresponding control signals for attracting, two electrolytic capacitors start to be charged, after preset time (the time point that the electrolytic capacitors are approximately fully charged can be selected, such as 20S), the voltage value of a single electrolytic capacitor (the first electrolytic capacitor or the second electrolytic capacitor) is detected, and when the detected voltage value is normal, the second alternating current contactor is controlled to attract, so that the two electrolytic capacitors are charged; when the detected voltage value is abnormal (the voltage value is lower or higher), the first alternating current contactor is disconnected, and the second alternating current contactor is controlled not to be attracted, so that the electrolytic capacitor is prevented from being continuously charged and damaged. The control method can effectively avoid the situation that the electrolytic capacitor is exploded due to no protection when the electrolytic capacitors connected in series are in reverse phase in production or maintenance, and prevent the situation that the partial pressure of the electrolytic capacitor is uneven after the air conditioner runs for a long time, thereby improving the reliability of the three-phase rectification circuit and increasing the protection to the air conditioner and users.
In the above technical solution, preferably, the step of controlling the first ac contactor to be turned off or the second ac contactor to be turned on according to the voltage value includes: acquiring an effective voltage value between any alternating current input at the alternating current input end of the three-phase rectification module of the three-phase rectification circuit and a zero line of the three-phase rectification circuit, which is detected by a second voltage detection circuit; and comparing the voltage value detected by the first voltage detection circuit with the effective voltage value, and controlling the first alternating current contactor to be disconnected or controlling the second alternating current contactor to be pulled in according to the comparison result.
In the technical scheme, the voltage value detected by the first voltage detection circuit is compared with the effective voltage value detected by the second voltage detection circuit, so that whether the voltage value detected by the first voltage detection circuit is abnormal or not is judged, when the voltage value is normal, the second alternating current contactor is controlled to be attracted, the two electrolytic capacitors are charged, and when the voltage value is abnormal, the electrolytic capacitors are prevented from being damaged due to continuous charging by disconnecting the first alternating current contactor attracted at the front end.
In any of the above technical solutions, preferably, whether an absolute value of a difference between the voltage value and the voltage effective value is greater than a first threshold is determined; when the judgment result is yes, controlling the first alternating current contactor to be disconnected, and controlling the second alternating current contactor to be kept disconnected; and when the judgment result is negative, controlling the second alternating current contactor to attract, judging whether the absolute value of the difference value of the voltage value and the voltage effective value is larger than a second threshold value, and if so, sending prompt information.
In the technical scheme, when the absolute value of the difference value between the voltage value of a single electrolytic capacitor (a first electrolytic capacitor or a second electrolytic capacitor) detected by a first voltage detection circuit and the effective value of the voltage between zero and live lines detected by a second voltage detection circuit is larger than a first threshold value, the voltage bias of the electrolytic capacitor is serious, a first alternating current contactor is disconnected, and a second alternating current contactor is kept disconnected continuously, so that the voltage of the electrolytic capacitor is prevented from being damaged due to continuous charging; and when the absolute value of the difference between the voltage value and the effective voltage value is smaller than or equal to a first threshold value, controlling a second alternating current contactor to be attracted, judging whether the absolute value of the difference between the voltage value and the effective voltage value is larger than a second threshold value, if so, indicating that the electrolytic capacitor has slight uneven voltage division but does not influence work, and sending prompt information to arouse the attention of users or production and maintenance personnel so as to prevent the condition that the electrolytic capacitor has uneven voltage division after the product runs for a long time.
In any one of the above technical solutions, preferably, the control method further includes: and if the judgment result of judging whether the absolute value of the difference value of the voltage value and the voltage effective value is larger than the first threshold value is yes, displaying a fault code.
In the technical scheme, if the absolute value of the difference value between the voltage value and the effective voltage value is greater than the first threshold, the electrolytic capacitor is indicated to have serious voltage bias, the first alternating current contactor is disconnected, the second alternating current contactor is continuously disconnected, and meanwhile, a fault code is displayed, so that production maintenance personnel can determine the fault reason and timely maintain the electrolytic capacitor.
The present invention also provides an air conditioner, comprising: the three-phase rectifier circuit according to any one of the above technical solutions.
According to the air conditioner of the present invention, the three-phase rectification circuit according to any one of the above technical solutions is adopted, so that the air conditioner has all the effective effects of the three-phase rectification circuit, and the details are not repeated herein.
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
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic diagram of a three-phase rectifier circuit in the related art;
FIG. 2 shows a schematic diagram of a three-phase rectifier circuit according to one embodiment of the invention;
fig. 3 shows a flow chart diagram of a control method of a three-phase rectifier circuit according to an embodiment of the invention;
fig. 4 shows a flow chart diagram of a control method of a three-phase rectifier circuit according to another embodiment of the invention;
fig. 5 shows a flow chart diagram of a control method of a three-phase rectifier circuit according to a further embodiment of the invention;
fig. 6 is a flowchart illustrating a control method of a three-phase rectifier circuit according to an embodiment of the present invention;
fig. 7 shows a schematic block diagram of an air conditioner according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
As shown in fig. 2, a schematic diagram of a three-phase rectifier circuit according to an embodiment of the present invention. Wherein, this three-phase rectifier circuit includes: the three-phase rectifier bridge stack BD-1 is characterized in that the alternating current input end of the three-phase rectifier bridge stack BD-1 comprises a first-phase alternating current input L1, a second-phase alternating current input L2 and a third-phase alternating current input L3; the first alternating current contactor KMB is connected to the direct current output end of the three-phase rectifier bridge stack BD-1; a second ac contactor KMA connected in series with the first ac contactor KMB; a first electrolytic capacitor E1, wherein the anode of the first electrolytic capacitor E1 is connected to the output end of the second alternating current contactor KMA; the second electrolytic capacitor E2 is connected with the first electrolytic capacitor E1 in series, and the negative electrode of the second electrolytic capacitor E2 is connected with the direct-current output end of the three-phase rectifier bridge stack BD-1; and at least one thermistor PCT connected with the second alternating current contactor in parallel, wherein the at least one thermistor PCT comprises a first thermistor and a second thermistor which are connected in series, and a capacitor C1 is connected in parallel at two ends of a first electrolytic capacitor and a second electrolytic capacitor which are connected in series.
The three-phase rectifier circuit provided by the invention is additionally provided with the first alternating current contactor KMB to control the on-off of the direct current output end of the three-phase rectifier bridge stack BD-1, when the air conditioner works normally, after the first alternating current contactor KMB receives corresponding control signals for attracting, two electrolytic capacitors start to be charged, after preset time (the time point that the electrolytic capacitors are approximately fully charged, such as 20S, can be selected), the voltage value of a single electrolytic capacitor (the first electrolytic capacitor E1 or the second electrolytic capacitor E2) is detected, and when the detected voltage value is normal, the second alternating current contactor KMA is controlled to attract, so that the two electrolytic capacitors are charged; and when the detected voltage value is abnormal (the voltage value is lower or higher), the first alternating current contactor KMB is disconnected, and the second alternating current contactor KMA is controlled not to be attracted, so that the electrolytic capacitor is prevented from being damaged due to continuous charging. The three-phase rectifier circuit provided by the invention can effectively avoid the situation that the electrolytic capacitor is exploded due to no protection when the electrolytic capacitors connected in series are in reverse phase in the production stage or in market maintenance, and prevent the situation that the partial pressure of the electrolytic capacitor is uneven after the air conditioner runs for a long time, thereby improving the reliability of the three-phase rectifier circuit and increasing the protection for the air conditioner and users.
In this embodiment, at least one thermistor PCT is connected in parallel to the second ac contactor KMA, and during the power-on period, the second ac contactor KMA is in the off state, and the charging current passes through the thermistor, and the thermistor functions to suppress the current in the circuit, thereby preventing the current from overshooting and damaging the electrolytic capacitor.
In this embodiment, it should be understood by those skilled in the art that the number of thermistors is not limited to 2, and one or more thermistors may be provided according to the requirement of the circuit, as long as the charging current overshoot can be avoided and the electrolytic capacitor can be prevented from being damaged.
In this embodiment, the capacitor C1 connected in parallel across the first electrolytic capacitor E1 and the second electrolytic capacitor E2 connected in series acts as a filter, thereby increasing the stability and reliability of the overall circuit.
In one embodiment of the present invention, preferably, the method further includes: and a first voltage detection circuit connected to both sides of the second electrolytic capacitor E2.
In this embodiment, the first voltage detection circuit is connected to both sides of the second electrolytic capacitor E2, instead of both sides of the first electrolytic capacitor E1 and the second electrolytic capacitor E2 connected in series, and by detecting whether the voltage value of a single electrolytic capacitor (i.e., the second electrolytic capacitor E2) is abnormal, it is possible to determine whether the second electrolytic capacitor E2 is connected in series in reverse or the voltage division is uneven, and to open the first ac contactor KMB when the detected voltage value is abnormal, thereby preventing the electrolytic capacitor from being over-voltage exploded.
In another embodiment of the present invention, it is preferable that the first voltage detection circuit is connected to both sides of the first electrolytic capacitor E1.
In one embodiment of the present invention, preferably, the method further includes: and the second voltage detection circuit is connected to any one alternating current input end of the three-phase rectifier bridge stack BD-1 and two sides of a zero line of the three-phase rectifier circuit.
In this embodiment, the second voltage detection circuit is used to detect the effective voltage value of the zero line and live line, specifically, the effective voltage value between any ac input terminal of the three-phase rectifier bridge stack BD-1 and the zero line of the three-phase rectifier circuit. The effective voltage value can be used as a reference voltage and is compared with a voltage value detected by the first voltage detection circuit, so that whether the voltage value detected by the first voltage detection circuit is abnormal or not is judged, and when the voltage value is abnormal, the electrolytic capacitor is prevented from being damaged due to continuous charging by disconnecting the first alternating current contactor KMB attracted at the front end.
As shown in fig. 3, a flow chart of a control method of a three-phase rectifier circuit according to an embodiment of the present invention is schematically shown. The control method of the three-phase rectification circuit comprises the following steps:
and step 306, controlling the first alternating current contactor to be disconnected or controlling the second alternating current contactor to be closed according to the voltage value.
According to the control method of the three-phase rectification circuit, when an air conditioner works normally, after a first alternating current contactor receives corresponding control signals for attracting, two electrolytic capacitors start to be charged, after preset time (the time point that the electrolytic capacitors are approximately fully charged can be selected, such as 20S), the voltage value of a single electrolytic capacitor (the first electrolytic capacitor or the second electrolytic capacitor) is detected, and when the detected voltage value is normal, the second alternating current contactor is controlled to attract, so that the two electrolytic capacitors are charged; when the detected voltage value is abnormal (the voltage value is lower or higher), the first alternating current contactor is disconnected, and the second alternating current contactor is controlled not to be attracted, so that the electrolytic capacitor is prevented from being continuously charged and damaged. The control method can effectively avoid the situation that the electrolytic capacitor is exploded due to no protection when the electrolytic capacitors connected in series are in reverse phase in production or maintenance, and prevent the situation that the partial pressure of the electrolytic capacitor is uneven after the air conditioner runs for a long time, thereby improving the reliability of the three-phase rectification circuit and increasing the protection to the air conditioner and users.
As shown in fig. 4, a flow chart of a control method of a three-phase rectifier circuit according to another embodiment of the invention is schematically shown. The control method of the three-phase rectification circuit comprises the following steps:
and step 408, comparing the voltage value detected by the first voltage detection circuit with the effective voltage value, and controlling the first alternating current contactor to be disconnected or controlling the second alternating current contactor to be closed according to the comparison result.
In the embodiment, the voltage value detected by the first voltage detection circuit is compared with the effective voltage value detected by the second voltage detection circuit, so as to judge whether the voltage value detected by the first voltage detection circuit is abnormal or not, when the voltage value is normal, the second alternating current contactor is controlled to be attracted, so that the two electrolytic capacitors are charged, and when the voltage value is abnormal, the electrolytic capacitors are prevented from being damaged due to continuous charging by disconnecting the first alternating current contactor attracted at the front end.
In another embodiment of the present invention, the voltage value detected by the first voltage detection circuit may be compared with a preset voltage value, so as to determine whether the voltage of a certain electrolytic capacitor is abnormal according to the comparison result.
As shown in fig. 5, a flow chart of a control method of a three-phase rectifier circuit according to still another embodiment of the present invention is schematically shown. The control method of the three-phase rectification circuit comprises the following steps:
In this embodiment, when the absolute value of the difference between the voltage value of a single electrolytic capacitor (the first electrolytic capacitor or the second electrolytic capacitor) detected by the first voltage detection circuit and the effective value of the voltage between the zero line and the fire line detected by the second voltage detection circuit is greater than the first threshold, it is indicated that the voltage bias of the electrolytic capacitor is serious, the first ac contactor is disconnected, the second ac contactor is kept disconnected continuously, and a fault code is displayed at the same time, so that the voltage of the electrolytic capacitor can be prevented from being damaged due to continuous charging, and a production maintenance worker can identify the cause of the fault and maintain the fault in time; and when the absolute value of the difference between the voltage value and the effective voltage value is smaller than or equal to a first threshold value, controlling a second alternating current contactor to be attracted, judging whether the absolute value of the difference between the voltage value and the effective voltage value is larger than a second threshold value, if so, indicating that the electrolytic capacitor has slight uneven voltage division but does not influence work, and sending prompt information to arouse the attention of users or production and maintenance personnel so as to prevent the condition that the electrolytic capacitor has uneven voltage division after the product runs for a long time.
As shown in fig. 6, a flow chart of a control method of a three-phase rectification circuit according to an embodiment of the invention is schematically shown. The three-phase rectification circuit is the three-phase rectification circuit shown in fig. 2, and the control method comprises the following steps:
at step 616, the electrolytic capacitor is charged.
Wherein T1 may select a point in time when the electrolytic capacitor is approximately fully charged, such as 20 s;
v1, V2, V3 and V4 are fixed voltage judgment values and can be adjusted according to actual needs, wherein V1 and V2 are voltage bias severe values, and V3 and V4 are voltage deviation slight values.
According to the control method of the three-phase rectification circuit, the first alternating current contactor at the front end is disconnected when the voltage of a single electrolytic capacitor is detected to be abnormal, so that the situation that the electrolytic capacitor is over-voltage and damaged by explosion is prevented, the situation that a machine explodes the electrolytic capacitor due to the fact that the electrolytic capacitor is connected in series reversely or the electrolytic capacitor is not uniformly divided in voltage can be effectively avoided, the protection on products and users is increased, and the situation that the electrolytic capacitor is not uniformly divided in voltage after the products run for a long time is also prevented.
As shown in fig. 7, a schematic block diagram of an air conditioner according to an embodiment of the present invention. Wherein, this air conditioner 700 includes: such as the three-phase rectification circuit 702 in the above embodiment.
The air conditioner 700 provided by the present invention adopts the three-phase rectification circuit 702 in the above embodiment, so that the air conditioner has all the effective effects of the three-phase rectification circuit 702, and the details are not repeated herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A three-phase rectifier circuit, comprising:
the alternating current input end of the three-phase rectification module comprises a first-phase alternating current input, a second-phase alternating current input and a third-phase alternating current input;
the first alternating current contactor is connected to the direct current output end of the three-phase rectification module;
the second alternating current contactor is connected with the first alternating current contactor in series;
the anode of the first electrolytic capacitor is connected to the output end of the second alternating current contactor;
the second electrolytic capacitor is connected with the first electrolytic capacitor in series, and the negative electrode of the second electrolytic capacitor is connected to the direct current output end of the three-phase rectification module;
at least one thermistor connected in parallel with the second ac contactor;
the first voltage detection circuit is connected to two sides of the first electrolytic capacitor or two sides of the second electrolytic capacitor;
the second voltage detection circuit is connected to any one alternating current input end of the alternating current input ends of the three-phase rectification modules and two sides of a zero line of the three-phase rectification circuit;
the second voltage detection circuit is used for detecting the effective voltage value of the zero line and the live line, the effective value is used as reference voltage to be compared with the voltage value detected by the first voltage detection circuit, and whether the voltage value detected by the first voltage detection circuit is abnormal or not is judged.
2. The three-phase rectification circuit according to claim 1,
the at least one thermistor includes a first thermistor and a second thermistor in series.
3. The three-phase rectification circuit according to claim 1, further comprising:
and the capacitor is connected in parallel with two ends of the first electrolytic capacitor and the second electrolytic capacitor which are connected in series.
4. A control method of the three-phase rectification circuit according to claim 1, characterized by comprising:
after electrification, controlling a first alternating current contactor of the three-phase rectification circuit to be attracted, controlling a second alternating current contactor of the three-phase rectification circuit not to be attracted, and starting timing;
after a first preset time, acquiring voltage values of two sides of the first electrolytic capacitor or two sides of the second electrolytic capacitor detected by a first voltage detection circuit;
according to the voltage value, controlling the first alternating current contactor to be disconnected or controlling the second alternating current contactor to be closed;
the step of controlling the first AC contactor to be disconnected or the second AC contactor to be closed according to the voltage value comprises the following steps:
acquiring a voltage effective value between any alternating current input at the alternating current input end of the three-phase rectification module of the three-phase rectification circuit and a zero line of the three-phase rectification circuit, which is detected by a second voltage detection circuit;
and comparing the voltage value detected by the first voltage detection circuit with the voltage effective value, and controlling the first alternating current contactor to be disconnected or controlling the second alternating current contactor to be sucked according to the comparison result.
5. The control method according to claim 4,
judging whether the absolute value of the difference value of the voltage value and the voltage effective value is larger than a first threshold value or not;
when the judgment result is yes, controlling the first alternating current contactor to be disconnected, and controlling the second alternating current contactor to be kept disconnected;
and when the judgment result is negative, controlling a second alternating current contactor to attract, judging whether the absolute value of the difference value of the voltage value and the voltage effective value is larger than a second threshold value, and if so, sending prompt information.
6. The control method according to claim 5, characterized by further comprising:
and if the judgment result of judging whether the absolute value of the difference value of the voltage value and the voltage effective value is larger than the first threshold value is yes, displaying a fault code.
7. An air conditioner, comprising:
a three-phase rectification circuit as claimed in any one of claims 1 to 3.
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| CN102820771A (en) * | 2012-08-10 | 2012-12-12 | 深圳市禾望电气有限公司 | Soft start device and soft start method of converter equipment |
| CN103647314A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | A super capacitor charging protection apparatus |
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| CN101817471B (en) * | 2010-04-27 | 2012-06-13 | 天津大学 | Super capacitor energy-storage type elevator driver |
| CN204481463U (en) * | 2014-12-19 | 2015-07-15 | 芜湖国睿兆伏电子有限公司 | A kind of series connection electrolysis capacitance protection circuit |
| CN104578746A (en) * | 2014-12-31 | 2015-04-29 | 山东艾磁驱动科技有限公司 | Electrolytic capacitor precharging circuit |
| CN205595782U (en) * | 2016-03-31 | 2016-09-21 | 三菱重工海尔(青岛)空调机有限公司 | Inrush current restraines return circuit |
| CN106059349A (en) * | 2016-07-27 | 2016-10-26 | 海信（山东）空调有限公司 | Three-phase electric rectification circuit and three-phase electric rectification circuit time sequence control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102820771A (en) * | 2012-08-10 | 2012-12-12 | 深圳市禾望电气有限公司 | Soft start device and soft start method of converter equipment |
| CN103647314A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | A super capacitor charging protection apparatus |
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