CN107591783B - Three-phase power supply protection circuit and control method thereof - Google Patents
Three-phase power supply protection circuit and control method thereof Download PDFInfo
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- CN107591783B CN107591783B CN201710748214.0A CN201710748214A CN107591783B CN 107591783 B CN107591783 B CN 107591783B CN 201710748214 A CN201710748214 A CN 201710748214A CN 107591783 B CN107591783 B CN 107591783B
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Abstract
The invention provides a three-phase power supply protection circuit and a control method thereof, wherein the three-phase power supply protection circuit comprises: the first thermistor is connected between the phase voltage line and the first rectifying circuit; the filter circuit is connected between the first rectifying circuit and the switching power supply; one end of the control chip is connected with the first output end of the switching power supply, and the other end of the control chip is connected with the zero line protection circuit and the first relay; the first thermistor is used for conducting a circuit to charge an electrolytic capacitor on the filter circuit when the first relay is not closed, the filter circuit is used for filtering and improving the voltage range adaptability, and the control chip is used for controlling the first relay and the zero line protection circuit. The invention can avoid the problem that the switch power supply is easy to damage when the line voltage is used for power supply or the overvoltage is used for power supply.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a three-phase power supply protection circuit and a control method of the three-phase power supply protection circuit.
Background
In three-phase four-wire power applications, there are load devices powered by 220V phase voltage, i.e. one of the live and neutral wires, but there may be situations where two live, neutral or live wires are connected. In the related art three-phase four-wire power supply equipment, the switching power supply is usually supplied by one of the live wire and the zero wire, namely 220V, and if the power supply is not correct, or the installation is not noticed, when the phase is wrongly connected, especially when the 220V is wrongly connected to form 380V power supply, the switching power supply part can be immediately damaged, so that the equipment does not work.
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 power protection circuit.
Another aspect of the present invention is to provide a control method of a three-phase power protection circuit.
In view of the above, according to one aspect of the present invention, there is provided a three-phase power protection circuit, including: the first thermistor is connected between the phase voltage line and the first rectifying circuit; the filter circuit is connected between the first rectifying circuit and the switching power supply; one end of the control chip is connected with the first output end of the switching power supply, and the other end of the control chip is connected with the zero line protection circuit and the first relay; the first thermistor is used for conducting a circuit to charge an electrolytic capacitor on the filter circuit when the first relay is not closed, the filter circuit is used for filtering and improving the voltage range adaptability, and the control chip is used for controlling the first relay and the zero line protection circuit.
The invention provides a three-phase power supply protection circuit, wherein a first thermistor is connected in series between a phase voltage wire and a first rectifying circuit and is connected in parallel with a first relay, when the first relay is not attracted, an electrolytic capacitor on a filter circuit is charged through a first thermistor conducting circuit, a switching power supply provides a 12V power supply for a post-stage circuit and provides a 5V power supply for a control chip, the control chip controls the first relay to be attracted so that the switching power supply formally works, the filter circuit is connected in parallel between the first rectifying circuit and the switching power supply, and the three-phase power supply protection circuit has the functions of filtering and solving the problem that when the input end is connected with the line voltage by mistake, the rectified voltage is too high to cause capacitor damage. The invention can avoid the problem that the switch power supply is easy to damage when the line voltage is used for power supply or the overvoltage is used for power supply. Meanwhile, the switching power supply does not work when detecting overvoltage, 5V and 12V outputs are cut off, and a rear-stage circuit is protected.
The three-phase power protection circuit according to the present invention may further include the following features:
in the above technical solution, preferably, the zero line protection circuit is connected between the zero line and the switching device circuit and is connected to the control chip, and the zero line protection circuit is used for protecting the post-stage circuit under the control of the control chip.
In the technical scheme, the three-phase power supply protection circuit further comprises a zero line protection circuit, the zero line protection circuit is connected between a zero line and the switching device circuit and is connected with the control chip, and after the switching power supply normally works, the control chip controls the work of devices in the zero line protection circuit to further protect loads and devices of the phase voltage of the rear stage.
In any of the above technical solutions, preferably, the filter circuit includes a first electrolytic capacitor, a second electrolytic capacitor, a third resistor, and a fourth resistor; the first electrolytic capacitor is connected with the second electrolytic capacitor in series, the third resistor is connected with the fourth resistor in series, and the first electrolytic capacitor and the second electrolytic capacitor are connected with the third resistor and the fourth resistor in parallel.
In the technical scheme, the first electrolytic capacitor and the second electrolytic capacitor are connected in series and then connected in parallel on a rectified circuit, so that the voltage resistance is improved, and meanwhile, each electrolytic capacitor is connected in parallel with a power resistor to play a role in balancing and dividing voltage. When the circuit is powered by two live wires through phase voltage misconnection, namely line voltage, the weak link electrolytic capacitor part of the original power supply adopts a measure that two electrolytic capacitors (the voltage withstanding value of the sum of the two capacitors is higher than the voltage value after line voltage rectification) are connected in series, so that the danger of explosion of the electrolytic capacitors due to misconnection of line voltage is solved, and the scheme of connecting the capacitors in series is the most economical in view of feasibility of high voltage.
In any one of the above technical solutions, preferably, the zero line protection circuit includes a second thermistor, a second relay, and a third relay; the second thermistor and the second relay are connected in series between the zero line and the circuit of the switching device, and the third relay is connected in parallel with the second thermistor and the second relay; or the second relay and the third relay are connected in series between the zero line and the switching device circuit, and the second thermistor and the third relay are connected in parallel.
In the technical scheme, the connection mode in the zero line protection circuit has two types: (1) the second thermistor and the second relay are connected in series between the zero line and the circuit of the switching device, and the third relay is connected in parallel with the second thermistor and the second relay; (2) the second relay and the third relay are connected in series between the zero line and the circuit of the switching element, and the second thermistor and the third relay are connected in parallel; the first thermistor and the second thermistor are thermistors. After the control chip controls the second relay to be attracted, the circuit is conducted, the current is limited by the second thermistor to charge an electrolytic capacitor in the switch device circuit, and then the control chip controls the third relay to be attracted, at the moment, (1) the current is provided for the switch device circuit through the third relay, and (2) the current is provided for the switch device circuit through the second relay and the third relay, so that the switch circuit is protected. In addition, (1) compared with (2), the second relay and the third relay are not connected in series, so that the sizes of the two relays can be different, and different loads can be controlled.
In any one of the above technical solutions, preferably, the second relay and the third relay are respectively connected to the control chip.
In the technical scheme, the second relay and the third relay are respectively connected with the control chip, so that the actuation of the two relays is controlled through the control chip, and the protection of a switch device circuit and a load and a device of a phase voltage of a rear stage through a leading protection circuit is realized.
In any of the above technical solutions, preferably, the control terminals of the first relay, the second relay and the third relay are all connected to a 12V power supply.
In the technical scheme, the power is supplied to the first relay, the second relay and the third relay through the 12V power supply, so that the normal work of the relays is ensured.
In any of the above technical solutions, preferably, the switching device circuit includes a second rectification circuit, a third electrolytic capacitor, a fourth electrolytic capacitor, a thin film capacitor, a voltage dependent resistor, and a power resistor; the second rectifying circuit, the third electrolytic capacitor, the fourth electrolytic capacitor, the film capacitor, the piezoresistor and the power resistor are connected in parallel.
In the technical scheme, the switching device circuit comprises a second rectifying circuit, a third electrolytic capacitor, a fourth electrolytic capacitor, a film capacitor, a piezoresistor and a power resistor, the third electrolytic capacitor and the fourth electrolytic capacitor are charged through a second thermistor after a second relay is pulled in, a required load is connected behind the switching device circuit, the film capacitor is used for absorbing surge, the piezoresistor is used for resisting the surge, and the power resistor is used for reducing the discharge time of the discharge capacitor.
In any of the above technical solutions, preferably, the first rectification circuit is connected to the zero line, and the second rectification circuit is connected to the phase voltage line; a protective tube is connected in series between the second rectifying circuit and the phase voltage line.
In the technical scheme, a protective tube is connected in series between the second rectifying circuit and the phase voltage line to protect the second rectifying circuit from running safely.
According to another aspect of the present invention, there is provided a control method of a three-phase power protection circuit for use in any one of the above three-phase power protection circuits, comprising: detecting whether the voltage of the three-phase power supply is normal; when the voltage of the three-phase power supply is normal, controlling the first relay to pull in after delaying for a preset time; after controlling the first relay to be sucked, judging whether the phase sequence of the three-phase power supply is correct or not; when the phase sequence of the three-phase power supply is correct, controlling the second relay to be absorbed to charge the switching device circuit; judging whether the charging of the switching device circuit is finished or not; when the charging of the switching device circuit is finished, the third relay is controlled to be attracted so that the rear-stage circuit works normally.
The control method of the three-phase power supply protection circuit provided by the invention has the advantages that equipment is powered on, the first relay is controlled to be attracted in a delayed mode under the condition that the power supply voltage is normal, namely the voltage is the phase voltage, the damage of the relay caused by abnormal voltage is prevented, whether the phase sequence of the three-phase power supply is correct or not is further judged, when the phase sequence is correct, the input end of the three-phase power supply is not connected in a wrong mode, the second relay is controlled to be attracted to enable the zero line to be conducted, the circuit of the switching device is charged, after the circuit of the switching device is charged, the third relay is controlled to be attracted to enable the rear-stage circuit to work normally, the condition that the phase voltage is connected into the zero line voltage or the connected power supply is short of the zero line voltage to cause the.
The control method of the three-phase power protection circuit according to the present invention may further include the following technical features:
in the above technical solution, preferably, the method further includes: when the voltage of the three-phase power supply is abnormal, the first relay is not controlled to be closed, and whether the voltage of the three-phase power supply is normal or not is continuously detected; when the phase sequence of the three-phase power supply is incorrect, the second relay is not controlled to be attracted, and whether the charging of the switching device circuit is finished or not is continuously judged; when the charging of the switching device circuit is not finished, the third relay is not controlled to be closed, and whether the charging of the switching device circuit is finished or not is continuously judged.
In the technical scheme, when the voltage of the three-phase power supply is abnormal, namely the voltage is the line voltage, or when the phase sequence of the three-phase power supply is incorrect, the input end of the three-phase power supply is indicated to be connected in a wrong way, the first relay is controlled to be disconnected, or the second relay is controlled to be disconnected, and the load and components are prevented from being damaged. When the charging of the switching device circuit is not finished, the third relay is not controlled to be closed so as to ensure the normal charging of the switching device circuit.
In any of the above technical solutions, preferably, the method further includes: and charging the filter circuit and the switching power supply within a preset time.
In the technical scheme, the filter circuit and the switching power supply are charged within the preset time, so that the switching power supply can provide a 5V power supply for the control chip, and the control chip works normally.
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. 1a shows a schematic diagram of a three-phase power protection circuit according to an embodiment of the present invention;
FIG. 1b shows a schematic diagram of a three-phase power protection circuit according to an embodiment of the present invention;
fig. 2 is a flow chart showing a control method of the three-phase power protection circuit according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1a and 1b is:
102 a first thermistor, 104 a first rectifying circuit, 106 a filter circuit, 108 a switching power supply, 110 a control chip, 112 a zero line protection circuit, 114 a first relay, 116 a switching device circuit, 1202 a second thermistor, 1204 a second relay, 1206 a third relay, 1208 a protective tube, 1602 a second rectifying circuit, 1604 a third electrolytic capacitor, 1606 a fourth electrolytic capacitor, 1608 a thin film capacitor, 1610 a piezoresistor and 1612 a power resistor.
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 to the specific embodiments disclosed below.
In an embodiment of the first aspect of the present invention, a three-phase power protection circuit is provided, and fig. 1a and fig. 1b show schematic structural diagrams of the three-phase power protection circuit of the present invention. Wherein, this three-phase power protection circuit includes:
a first thermistor 102, the first thermistor 102 being connected between the phase voltage line C and the first rectifying circuit 104;
a filter circuit 106, the filter circuit 106 being connected between the first rectifying circuit 104 and the switching power supply 108;
one end of the control chip 110 is connected with a first output end of the switching power supply 108, and the other end of the control chip 110 is connected with the zero line protection circuit 112 and the first relay 114; when the first relay 114 is not closed, the first thermistor 102 is connected to the circuit to charge the electrolytic capacitor in the filter circuit 106, the filter circuit 106 is used for filtering and improving voltage range adaptability, and the control chip 110 is used for controlling the first relay 114 and the zero line protection circuit 112.
According to the three-phase power supply protection circuit provided by the invention, the first thermistor 102 is connected between the phase voltage line C and the first rectifying circuit 104 in series and is connected with the first relay 114 in parallel, when the first relay 114 is not attracted, the electrolytic capacitor on the filter circuit 106 is charged through the conducting circuit of the first thermistor 102, the switch power supply 108 provides 12V power supply for a rear-stage circuit and provides 5V power supply for the control chip 110, the control chip 110 controls the first relay 114 to be attracted so that the switch power supply 108 works formally, wherein the filter circuit 106 is connected between the first rectifying circuit 104 and the switch power supply 108 in parallel, and the three-phase power supply protection circuit has the functions of filtering and solving the problem that the capacitor is damaged due to overhigh rectifying voltage when the input end is connected with the line voltage in error. The invention can avoid the problem that the switching power supply 108 is easy to damage when line voltage power supply or overvoltage power supply is carried out. Meanwhile, the switching power supply 108 does not work when detecting overvoltage, 5V and 12V output is cut off, and a rear-stage circuit is protected.
In one embodiment of the present invention, it is preferable that the neutral protection circuit 112 is connected between the neutral wire N and the switching device circuit 116, and is connected to the control chip 110, and the neutral protection circuit 112 is used to protect the rear stage circuit under the control of the control chip 110.
In this embodiment, the three-phase power protection circuit further includes a zero line protection circuit 112, the zero line protection circuit 112 is connected between the zero line N and the switching device circuit 116, and is connected to the control chip 110, and after the switching power supply 108 normally operates, the control chip 110 controls the operation of devices in the zero line protection circuit 112, so as to protect loads and devices of the phase voltage at the rear stage.
In one embodiment of the present invention, preferably, the filter circuit 106 includes a first electrolytic capacitor, a second electrolytic capacitor, a third resistor, and a fourth resistor; the first electrolytic capacitor is connected with the second electrolytic capacitor in series, the third resistor is connected with the fourth resistor in series, and the first electrolytic capacitor and the second electrolytic capacitor are connected with the third resistor and the fourth resistor in parallel.
In the embodiment, the first electrolytic capacitor and the second electrolytic capacitor are connected in series and then connected in parallel to a rectified circuit, so that the voltage resistance is improved, and meanwhile, each electrolytic capacitor is connected in parallel with a power resistor to play a role in balancing voltage division. When the circuit is powered by two live wires through phase voltage misconnection, namely line voltage, the weak link electrolytic capacitor part of the original power supply adopts a measure that two electrolytic capacitors (the voltage withstanding value of the sum of the two capacitors is higher than the voltage value after line voltage rectification) are connected in series, so that the danger of explosion of the electrolytic capacitors due to misconnection of line voltage is solved, and the scheme of connecting the capacitors in series is the most economical in view of feasibility of high voltage.
In one embodiment of the present invention, it is preferable that neutral protection circuit 12 includes a second thermistor 1202, a second relay 1204, a third relay 1206; as shown in fig. 1a, a second thermistor 1202 and a second relay 1204 are connected in series between the neutral line N and the switching device circuit 116, and a third relay 1206 is connected in parallel with the second thermistor 1202 and the second relay 1204; alternatively, as shown in fig. 1b, a second relay 1204 and a third relay 1206 are connected in series between the neutral line N and the switching device circuit 116, and a second thermistor 1202 is connected in parallel with the third relay 1206.
In this embodiment, there are two connection modes in the neutral protection circuit 112: (1) the second thermistor 1202 and the second relay 1204 are connected in series between the neutral line N and the switching device circuit 116, and the third relay 1206 is connected in parallel with the second thermistor 1202 and the second relay 1204; (2) the second relay 1204 and the third relay 1206 are connected in series between the neutral line N and the switching device circuit 116, and the second thermistor 1202 is connected in parallel with the third relay 1206; the first thermistor 102 and the second thermistor 1202 are thermistors. After the control chip 110 controls the second relay 1204 to be attracted, the circuit is conducted, current is limited through the second thermistor 1202 to charge an electrolytic capacitor in the switching device circuit 116, and then the control chip 110 controls the third relay 1206 to be attracted, at this time, (1) the current is provided for the switching device circuit 116 through the third relay 1206, and (2) the current is provided for the switching device circuit 116 through the second relay 1204 and the third relay 1206, so that the switching circuit is protected. In addition, (1) compared with (2), the second relay 1204 and the third relay 1206 are not connected in series, so that the two relays can be different in size and control different loads.
In one embodiment of the present invention, the second relay 1204 and the third relay 1206 are preferably connected to the control chip 110, respectively.
In this embodiment, the second relay 1204 and the third relay 1206 are respectively connected to the control chip 110, and the pull-in of the two relays is controlled by the control chip 110, so as to protect the load and the device of the switching device circuit 116 and the phase voltage at the rear stage by the leading protection circuit.
In one embodiment of the present invention, it is preferable that the control terminals of the first relay 114, the second relay 1204, and the third relay 1206 are all connected to a 12V power supply.
In this embodiment, the first relay 114, the second relay 1204 and the third relay 1206 are powered by a 12V power supply, so that the normal operation of the relays is ensured.
In one embodiment of the present invention, preferably, the switching device circuit 116 includes a second rectifying circuit 1602, a third electrolytic capacitor 1604, a fourth electrolytic capacitor 1606, a thin film capacitor 1608, a voltage dependent resistor 1610, a power resistor 1612; the second rectifying circuit 1602, the third electrolytic capacitor 1604, the fourth electrolytic capacitor 1606, the thin-film capacitor 1608, the varistor 1610 and the power resistor 1612 are connected in parallel.
In this embodiment, the switching device circuit includes a second rectifying circuit 1602, a third electrolytic capacitor 1604, a fourth electrolytic capacitor 1606, a thin film capacitor 1608, a voltage dependent resistor 1610, and a power resistor 1612, the third electrolytic capacitor 1604 and the fourth electrolytic capacitor 1606 are charged by the second thermistor 1202 after the second relay 1204 is pulled in, and a load is connected behind the switching device circuit 116, wherein the thin film capacitor 1608 is used for absorbing a surge, the voltage dependent resistor 1610 is used for resisting the surge, and the power resistor 1612 is used for reducing a discharging time of the discharging capacitor.
In one embodiment of the present invention, preferably, the first rectifying circuit 104 is connected to the neutral line N, and the second rectifying circuit 1608 is connected to the phase voltage line C; a fuse 1208 is connected in series between the second rectifier circuit 1608 and the phase voltage line C.
In this embodiment, a protective tube 1208 is connected in series between the second rectification circuit and the phase voltage line C to protect the second rectification circuit 1602 from safe operation.
In an embodiment of the second aspect of the present invention, a control method for a three-phase power protection circuit is provided, where the control method is used for any one of the three-phase power protection circuits, and fig. 2 is a schematic flow chart of the control method for the three-phase power protection circuit according to an embodiment of the present invention. Wherein, the method comprises the following steps:
step 202, detecting whether the voltage of the three-phase power supply is normal;
step 204, when the voltage of the three-phase power supply is normal, controlling a first relay to pull in after delaying preset time;
step 206, when the voltage of the three-phase power supply is abnormal, the first relay is not controlled to pull in, and whether the voltage of the three-phase power supply is normal or not is continuously detected;
step 208, after controlling the first relay to pull in, judging whether the phase sequence of the three-phase power supply is correct;
step 210, when the phase sequence of the three-phase power supply is correct, controlling the second relay to be absorbed to charge the switch device circuit;
step 212, when the phase sequence of the three-phase power supply is incorrect, the second relay is not controlled to be closed, and whether the charging of the switching device circuit is finished or not is continuously judged;
step 214, judging whether the charging of the switching device circuit is finished;
step 216, when the charging of the switching device circuit is completed, controlling a third relay to pull in so as to enable the rear-stage circuit to work normally;
and step 218, when the charging of the switching device circuit is not finished, not controlling the third relay to pull in, and continuously judging whether the charging of the switching device circuit is finished.
The control method of the three-phase power supply protection circuit provided by the invention has the advantages that equipment is powered on, the first relay is controlled to be attracted in a delayed mode under the condition that the power supply voltage is normal, namely the voltage is the phase voltage, the damage of the relay caused by abnormal voltage is prevented, whether the phase sequence of the three-phase power supply is correct or not is further judged, when the phase sequence is correct, the input end of the three-phase power supply is not connected in a wrong mode, the second relay is controlled to be attracted to enable the zero line to be conducted, the circuit of the switching device is charged, after the circuit of the switching device is charged, the third relay is controlled to be attracted to enable the rear-stage circuit to work normally, the condition that the phase voltage is connected into the zero line voltage or the connected power supply is short of the zero line voltage to cause the. When the voltage of the three-phase power supply is abnormal, namely the voltage is the line voltage, or when the phase sequence of the three-phase power supply is incorrect, the input end of the three-phase power supply is connected in a wrong way, the first relay is controlled to be disconnected, or the second relay is controlled to be disconnected, and the load and components are prevented from being damaged. When the charging of the switching device circuit is not finished, the third relay is not controlled to be closed so as to ensure the normal charging of the switching device circuit.
In one embodiment of the present invention, preferably, the method further includes: and charging the filter circuit and the switching power supply within a preset time.
In this embodiment, the filter circuit and the switching power supply are charged within a preset time, so that the switching power supply can provide a 5V power supply for the control chip, and the control chip can normally operate.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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.
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 (10)
1. A three-phase power protection circuit, comprising:
the first thermistor is connected between a phase voltage line and the first rectifying circuit;
the filter circuit is connected between the first rectifying circuit and the switching power supply;
one end of the control chip is connected with the first output end of the switching power supply, and the control chip is also connected with a zero line protection circuit and a first relay;
when the first relay is not closed, the first thermistor conducts a circuit to charge an electrolytic capacitor on the filter circuit, the filter circuit is used for filtering and improving voltage range adaptability, and the control chip is used for controlling the first relay and the zero line protection circuit;
the zero line protection circuit comprises a second thermistor, a second relay and a third relay;
the second thermistor and the second relay are connected in series between a zero line and a switching device circuit, a required load is connected behind the switching device circuit, the third relay is connected in parallel with the second thermistor and the second relay, or the second relay and the third relay are connected in series between the zero line and the switching device circuit, and the second thermistor is connected in parallel with the third relay.
2. The three-phase power protection circuit according to claim 1,
the zero line protection circuit is connected between the zero line and the switching device circuit and connected with the control chip, and the zero line protection circuit is used for protecting a post-stage circuit under the control of the control chip.
3. The three-phase power protection circuit of claim 1, wherein the filter circuit comprises a first electrolytic capacitor, a second electrolytic capacitor, a third resistor, and a fourth resistor;
the first electrolytic capacitor is connected with the second electrolytic capacitor in series, the third resistor is connected with the fourth resistor in series, and the first electrolytic capacitor and the second electrolytic capacitor are connected with the third resistor and the fourth resistor in parallel.
4. The three-phase power protection circuit according to claim 1, wherein the second relay and the third relay are respectively connected to the control chip.
5. The three-phase power protection circuit according to claim 4, wherein the control terminals of the first relay, the second relay and the third relay are all connected with a 12V power supply.
6. The three-phase power protection circuit according to any one of claims 1 to 5, wherein the switching device circuit comprises a second rectifying circuit, a third electrolytic capacitor, a fourth electrolytic capacitor, a thin film capacitor, a voltage dependent resistor, a power resistor;
the second rectifying circuit, the third electrolytic capacitor, the fourth electrolytic capacitor, the thin film capacitor, the piezoresistor and the power resistor are connected in parallel.
7. The three-phase power protection circuit according to claim 6, wherein the first rectifying circuit is connected to the neutral line, and the second rectifying circuit is connected to the phase voltage line;
and a protective tube is connected in series between the second rectifying circuit and the phase voltage wire.
8. A control method of a three-phase power supply protection circuit for the three-phase power supply protection circuit according to any one of claims 1 to 7, comprising:
detecting whether the voltage of the three-phase power supply is normal;
when the voltage of the three-phase power supply is normal, controlling a first relay to pull in after delaying for a preset time;
after controlling the first relay to be sucked, judging whether the phase sequence of the three-phase power supply is correct or not;
when the phase sequence of the three-phase power supply is correct, controlling the second relay to be absorbed to charge the switching device circuit;
judging whether the charging of the switching device circuit is finished or not;
and when the charging of the switching device circuit is finished, controlling the third relay to be attracted so as to enable the rear-stage circuit to work normally.
9. The control method of the three-phase power protection circuit according to claim 8, further comprising:
when the voltage of the three-phase power supply is abnormal, the first relay is not controlled to pull in, and whether the voltage of the three-phase power supply is normal or not is continuously detected;
when the phase sequence of the three-phase power supply is incorrect, the second relay is not controlled to be attracted, and whether the charging of the switching device circuit is finished or not is continuously judged;
and when the charging of the switching device circuit is not finished, the third relay is not controlled to be closed, and whether the charging of the switching device circuit is finished or not is continuously judged.
10. The control method of the three-phase power protection circuit according to claim 8, further comprising:
and charging the filter circuit and the switching power supply within the preset time.
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| CN201710748214.0A CN107591783B (en) | 2017-08-28 | 2017-08-28 | Three-phase power supply protection circuit and control method thereof |
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| CN201710748214.0A CN107591783B (en) | 2017-08-28 | 2017-08-28 | Three-phase power supply protection circuit and control method thereof |
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| CN107591783B true CN107591783B (en) | 2019-12-27 |
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| CN108599543B (en) * | 2018-04-18 | 2021-05-18 | 广东希塔变频技术有限公司 | Power supply charging control circuit and power supply charging control method |
| CN109347146A (en) * | 2018-11-22 | 2019-02-15 | 绵阳市维博电子有限责任公司 | A kind of motor driven systems energy feedback main circuit |
| CN113422352B (en) * | 2021-06-07 | 2022-06-21 | 山东建筑大学 | Strong-current switch circuit capable of automatically detecting short-circuit fault |
| CN113363932B (en) * | 2021-06-07 | 2022-06-21 | 山东建筑大学 | Series short-circuit fault detection and protection circuit based on electrolytic capacitor |
| CN115912899B (en) * | 2023-02-20 | 2023-05-23 | 广东东菱电源科技有限公司 | Capacitor series voltage dividing circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201315484Y (en) * | 2008-11-25 | 2009-09-23 | 海信（山东）空调有限公司 | Surge voltage suppressing circuit and air conditioner comprising same |
| CN103795050B (en) * | 2012-10-31 | 2017-03-15 | 中兴通讯股份有限公司 | High tension protection circuit, high voltage protective method and power supply |
| CN202997527U (en) * | 2012-12-28 | 2013-06-12 | 海信（山东）空调有限公司 | Fault detection protection circuit for three-phase power supply and inverter air conditioner |
| CN203456872U (en) * | 2013-08-30 | 2014-02-26 | 广东美的暖通设备有限公司 | Protection circuit for power supply of three-phase power source |
| CN204333946U (en) * | 2014-12-22 | 2015-05-13 | 广东美的制冷设备有限公司 | A kind of convertible frequency air-conditioner |
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