CN112803371A - High-voltage protection device of three-phase input switching power supply - Google Patents
High-voltage protection device of three-phase input switching power supply Download PDFInfo
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- CN112803371A CN112803371A CN202110046245.8A CN202110046245A CN112803371A CN 112803371 A CN112803371 A CN 112803371A CN 202110046245 A CN202110046245 A CN 202110046245A CN 112803371 A CN112803371 A CN 112803371A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
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Abstract
The invention discloses a high-voltage protection device of a three-phase input switching power supply, which comprises two main relays, two starting resistors, an alternating current input voltage detection and rectified direct current voltage detection and control circuit and auxiliary relay circuits, wherein the two auxiliary relay circuits are respectively connected with a normally open contact in series, and each auxiliary relay circuit comprises: an auxiliary relay, a positive temperature coefficient resistor PTC. According to the invention, through perfect protection of the alternating current input high voltage and the rectified direct current high voltage, the reliability problem caused by lightning stroke, surge and other abnormity can be remarkably reduced, and the reliability of the charging pile module is obviously improved; because a PTC is connected in series in the starting resistor, fault isolation under abnormal damage can be further realized, and reliability is further improved.
Description
[ technical field ]
The invention relates to the technical field of three-phase alternating current input slow start, alternating current input high voltage protection and direct current high voltage protection in a switching power supply, in particular to a three-phase alternating current input slow start, alternating current high voltage and direct current high voltage protection device.
[ background art ]
The charging pile module of the three-phase alternating current input in the industry at present, a three-phase alternating current input slow start circuit of the charging pile module is generally shown in fig. 1, a relay is respectively connected in series in any two-phase input line of a three-phase input A phase, a B phase and a C phase, a resistor is connected in parallel on a main contact of each relay, a rear rectifying filter capacitor is charged through the resistor in a slow start stage after power-on, an auxiliary power supply and a control circuit which are connected with an output filter capacitor are normally powered on and started, the relays K1 and K2 are closed at proper time points at the same time, normal slow start of the three-phase alternating current is realized, and some parts to be perfected in the existing slow start circuit technology are specifically explained below.
As shown in fig. 1, in the slow start circuit, when abnormal high voltage is caused by lightning, surge or other reasons in a three-phase input phase a, phase B and phase C, the high voltage will jump into a rectified capacitor, although the abnormal high voltage can be detected by ac input voltage detection or rectified capacitor voltage detection, so as to perform abnormal shutdown protection and alarm, the circuit cannot cut off connection with the input, cannot control rectified capacitor voltage within an allowable range, has hidden danger of damaging a power tube or rectified electrolytic capacitor, and has a specific case of damage due to high voltage in engineering operation; in addition, during engineering operation, such as relay failure or rear-stage circuit failure, the starting resistor R1 or R2 is over-powered, which easily causes the starting resistor (generally cement resistor) to be overheated, so that the PCB is carbonized and damaged or the failure is further enlarged.
[ summary of the invention ]
Aiming at the problems in the prior art, the invention provides a high-voltage protection device of a three-phase input switching power supply.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the utility model provides a three-phase input switching power supply's high voltage protection device, includes two main relays, two starting resistance, exchanges input voltage detection, rectification back direct current voltage detection and control circuit and respectively concatenates the auxiliary relay circuit of a normally open contact in two starting resistance, every auxiliary relay circuit includes: an auxiliary relay, a positive temperature coefficient resistor PTC.
Furthermore, the main relays of the two normally open contacts are respectively connected in series into any two-phase input line of the three-phase input.
Further, the two auxiliary relays are respectively connected with the positive temperature coefficient resistors PTC in parallel.
Further, a circuit formed by connecting the auxiliary relay circuit and the PTC in parallel is connected in series with the starting resistor R.
Furthermore, each main relay is connected in parallel with a circuit formed by connecting a normally open contact auxiliary relay and a PTC in parallel and then connecting the normally open contact auxiliary relay and the PTC in series with a starting resistor.
Furthermore, the control of the main relay and the auxiliary relay is carried out through the detection of the three-phase alternating current input voltage and the rectified direct current voltage, and the control circuit realizes the protection of the three-phase alternating current input high voltage and the rectified direct current high voltage through the on-off control of the main relay and the auxiliary relay.
The invention has the beneficial effects that:
compared with the prior art, the invention has the advantages that:
according to the invention, through perfect protection of the alternating current input high voltage and the rectified direct current high voltage, the reliability problem caused by lightning stroke, surge and other abnormity can be remarkably reduced, and the reliability of the charging pile module is obviously improved; because a PTC is connected in series in the starting resistor, fault isolation under abnormal damage can be further realized, and reliability is further improved.
[ description of the drawings ]
FIG. 1 is a schematic circuit diagram of a high voltage protection device for a three-phase input switching power supply according to the present invention;
fig. 2 is a schematic circuit diagram of a high-voltage protection device of a three-phase input switching power supply according to the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of a high-voltage protection device of a three-phase input switching power supply according to the present invention.
[ detailed description of the invention ]
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
According to the technical scheme, the control protection principle of the invention is explained as follows:
when the power is initially electrified, the rectified capacitor is charged through the PTC string starting resistor, the voltage of the capacitor gradually rises, the auxiliary power supply connected with the rectified capacitor starts to work, the three-phase alternating current input voltage and the rectified direct current voltage are detected, and the normal work of the detection and control functions is maintained.
When the AC input voltage is normal, the auxiliary relays of the two normally open contacts are immediately attracted, the PTC connected with the auxiliary relays in parallel is short-circuited after the auxiliary relays are attracted, the AC input continues to charge the rectified capacitor through the starting resistor, the two main relays are simultaneously attracted by adopting a fixed time delay mode or a mode of judging the voltage difference between the AC input voltage and the rectified voltage, and the rectified voltage further rises to an uncontrolled rectification terminal value to finish input slow start; after a certain time delay, a Power Factor Correction (PFC) circuit and a post-stage DCDC conversion circuit are started to work, and the slow start of the charging pile module is completed.
When alternating current is input with high voltage, the rectified direct current voltage is still in a normal range, the two auxiliary relays and the two main relays are kept disconnected, a Power Factor Correction (PFC) circuit and a post-stage DCDC conversion circuit are not started, and alternating current overvoltage warning information is uploaded; the rectified capacitor is supplied with power continuously through the PTC string starting resistor, the PTC is rapidly heated to form high resistance due to the work of the auxiliary power supply, the input voltage is basically added on the PTC, the voltage of the capacitor is gradually reduced until the auxiliary power supply cannot work normally, and high-voltage protection during high-voltage input and power-on is realized.
Under the normal working mode, when detecting AC input high voltage or rectified DC high voltage, the Power Factor Correction (PFC) circuit and the post-stage DCDC conversion circuit are immediately stopped in time sequence, then two main relays are simultaneously disconnected and two auxiliary relays are simultaneously disconnected, when the DC voltage falls back to a preset value, two auxiliary relays are pulled in, preferably, only one auxiliary relay is pulled in to maintain the normal work of the detection and control circuit, when the DC voltage rises to a preset protection value again, the auxiliary relay which is pulled in is disconnected again, the capacitor after rectification is charged through a starting resistor to maintain the normal work of the auxiliary power circuit, the auxiliary relay is disconnected again until the rectified DC output voltage is overvoltage again, and the steps are repeated, so that the AC voltage before rectification and the rectified DC voltage limit value are ensured to be in an allowable range, high-voltage protection is realized; and when the AC input voltage and the rectified DC voltage are detected to be recovered to be normal, entering a normal input slow start mode and then recovering to a normal working mode.
When three-phase alternating current is added under the condition that a part of the rectified alternating current is invalid or in a short-circuit state, as the main relay and the auxiliary relay of each path are normally open contacts, the PTC is connected in series in the starting circuit to form high resistance due to rapid heating so as to realize the blocking of alternating current input, the further spreading and expansion of faults caused by the fact that large current flows into a circuit behind can be avoided, and the fault isolation is realized.
The invention relates to a high-voltage protection device of a three-phase input switch power supply, wherein an auxiliary relay circuit of a normally open contact is serially connected into a starting resistor of each path, an auxiliary relay is connected with a positive temperature coefficient resistor PTC in parallel, a circuit formed by connecting the auxiliary relay circuit and the PTC in parallel and the starting resistor R in series is further connected with a main relay circuit of the normally open contact in parallel, the auxiliary relay circuit and the main relay circuit are respectively and independently controlled, when the AC input high voltage or the DC high voltage after rectification and filtration is detected, the main relay and the auxiliary relay of each path are simultaneously cut off, the PTC is serially connected into a main circuit, under the normal working condition of the auxiliary power supply, the PTC rapidly heats to form a high resistance, the input voltage is basically added on the PTC, thereby realizing the isolation of a rectification input circuit and the AC input, and the rectified voltage is reduced due to insufficient input current, when the direct current voltage after rectification is reduced to a certain value in a normal range, the auxiliary relay is closed, and the capacitor after rectification is charged through the starting resistor R, so that the effective protection of the alternating current input high voltage and the direct current high voltage after rectification is realized. When three-phase alternating current is added under the condition that a part of the rectified alternating current is invalid or in a short-circuit state, the main relay and the auxiliary relay of each path are normally open contacts, and the PTC is connected in series into the starting circuit to form high resistance due to rapid heating so as to block the alternating current input, so that the further expansion of the fault caused by the fact that large current flows into the circuit behind can be avoided, and the fault isolation is realized.
Example (b):
referring to fig. 3, a high voltage protection device for a three-phase INPUT switching power supply includes an ac INPUT terminal INPUT _ a, an ac INPUT terminal INPUT _ B, an ac INPUT terminal INPUT _ C, an ac INPUT voltage detection circuit, a rectified dc voltage detection circuit, a control circuit, and a rectification circuit, where the ac INPUT terminal INPUT _ a, the ac INPUT terminal INPUT _ B, and the ac INPUT terminal INPUT _ C are connected to the INPUT end of the rectification circuit, and what needs to be explained is: the alternating current input voltage detection circuit, the rectified direct current voltage detection circuit, the control circuit and the rectification circuit belong to the common knowledge of technical personnel in the field, meanwhile, the alternating current input voltage detection circuit, the rectified direct current voltage detection circuit, the control circuit and the rectification circuit are not the technical problems to be solved by the invention, and the alternating current input voltage detection circuit, the rectified direct current voltage detection circuit, the control circuit and the rectification circuit can select corresponding circuits according to actual needs, so that the circuit principle is not described in detail.
Referring to fig. 3, as a specific embodiment, the circuit integrally includes a high-voltage protective relay and a starting resistor connected in series in an ac input line, a rectification and PFC circuit, a three-phase ac input voltage detection circuit, a rectified dc voltage detection circuit, and a signal processing control circuit.
Specifically, referring to fig. 3, an ac INPUT _ a (phase a) is connected to one end of a first normally open main relay K1, one end of a third normally open auxiliary relay K3, and one end of a first positive temperature coefficient thermistor PTC1, the other end of the first normally open main relay K1 is connected to one end of a first starting resistor R1 to form an ac output signal PHS _ a, and the other end of the third normally open auxiliary relay K3 is connected to the other end of the first positive temperature coefficient thermistor PTC1 and the other end of the first starting resistor R1; an alternating current INPUT INPUT _ B (B phase) is connected with one end of a second normally-open main relay K2, one end of a fourth normally-open auxiliary relay K4 and one end of a second positive temperature coefficient thermistor PTC2, the other end of the second normally-open main relay K2 is connected with one end of a second starting resistor R2 to form an alternating current output signal PHS _ B, and the other end of a fourth normally-open auxiliary relay K4 is connected with the other end of a second starting resistor R2 and the other end of a second positive temperature coefficient thermistor PTC 2; an alternating current INPUT INPUT _ C (C phase) is connected with a following rectifying circuit, one end of a control coil of a first normally-open main RELAY K1, one end of a control coil of a second normally-open main RELAY K2, one end of a control coil of a third normally-open auxiliary RELAY K3, one end of a control coil of a fourth normally-open auxiliary RELAY K4, a cathode of a first diode VD1, a cathode of a second diode VD2, a cathode of a third diode VD3 and a cathode of a fourth diode VD4 are connected to VCC, the other end of the control coil of the first normally-open main RELAY K1, the other end of the control coil of the second normally-open main RELAY K2, an anode of the first diode VD1 and an anode of a second diode VD2 are connected to a main RELAY control signal RELAY _ M, the other end of the control coil of the third normally-open auxiliary RELAY K3, the other end of the control coil of the fourth normally-open auxiliary RELAY K4, the anode of the third diode VD3 and the anode of the fourth diode VD4 are connected to an auxiliary RELAY control signal RELAY _ F.
The working principle is as follows:
when the power-on is started, the power-on is charged through the PTC1 serial starting resistor R1 and the PTC2 serial starting resistor R2, the voltage gradually rises, and the auxiliary power supply and the control circuit normally work, so that the alternating current input voltage and the rectified direct current voltage can be detected.
When the AC input voltage is normal, the normally open contact auxiliary relay K3 and the normally open contact auxiliary relay K4 are immediately and simultaneously attracted, namely the PTC1 and the PTC2 are simultaneously and respectively short-circuited through the auxiliary relay K3 and the auxiliary relay K4, the input current continues to charge a rectified circuit through the starting resistors R1 and R2, the normally open contact main relay K1 and the normally open contact main relay K4 can be attracted simultaneously by adopting a fixed time delay mode or a mode of judging the pressure difference between the AC input voltage and the rectified voltage, the rectified voltage further rises to an uncontrolled rectification terminal value, and the input slow start is finished; starting a Power Factor Correction (PFC) circuit and a rear-stage DCDC conversion circuit after a certain time delay to work, and completing the slow start of the charging pile module;
when alternating current is input with high voltage, the rectified direct current voltage is still in a normal range, the normally open contact relay K1, the normally open contact relay K2, the normally open contact relay K3 and the normally open contact relay K4 are all kept disconnected, a Power Factor Correction (PFC) circuit and a rear-stage DCDC conversion circuit are not started, and alternating current overvoltage warning information is uploaded; the power supply is continuously charged through the PTC1 serial starting resistor R1 and the PTC2 serial starting resistor R2, the PTC is rapidly heated to form high resistance due to the work of the auxiliary power supply, the input voltage is basically added on the PTC, the voltage of the capacitor is gradually reduced until the auxiliary power supply cannot normally work, and high-voltage protection during high-voltage input and power-on is realized.
Under the normal working mode, when detecting AC input high voltage or rectified DC high voltage, the Power Factor Correction (PFC) circuit and the rear stage DCDC conversion circuit are immediately stopped in time sequence, then the normally open contact relay K1, the normally open contact relay K3, the normally open contact relay K2 and the normally open contact relay K4 are simultaneously opened, when the DC voltage drops back to the preset value, the normally open contact auxiliary relay K3 and the normally open contact auxiliary relay K4 are attracted, preferably only one of the normally open contact relay K3 and the normally open contact relay K4 is attracted to maintain the normal work of the detection and control circuit, when the DC voltage rises to the preset protection value again, the normally open contact relay K3 and the normally open contact relay K4 which are attracted just before and are reopened, and the steps are repeated, thereby ensuring that the AC voltage before rectification and the limit value of the rectified DC voltage are in the allowable range, high-voltage protection is realized; and when the AC input voltage and the rectified DC voltage are detected to be recovered to be normal, entering a normal input slow start mode and then recovering to a normal working mode.
When three-phase alternating current is added under the condition of partial failure or short circuit after rectification, because the main relay and the auxiliary relay of each path are normally open contacts, each PTC is connected in series in the starting circuit to form high resistance due to rapid heating so as to realize the blocking of alternating current input, thereby avoiding further spreading and expanding of faults caused by the fact that large current flows into the circuit behind, and realizing fault isolation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.
Claims (6)
1. The utility model provides a three-phase input switching power supply's high voltage protection device, its characterized in that includes two main relays, two starting resistance, and alternating current input voltage detects, after the rectification direct current voltage detects and control circuit and the auxiliary relay circuit who respectively concatenates a normally open contact in two starting resistance, and every auxiliary relay circuit includes: an auxiliary relay, a positive temperature coefficient resistor PTC.
2. The high voltage protection device of a three-phase input switching power supply according to claim 1, wherein the main relays of the two normally open contacts are respectively connected in series to any two-phase input lines of the three-phase input.
3. The high voltage protection device of a three-phase input switching power supply according to claim 1, wherein two auxiliary relays are respectively connected in parallel with a positive temperature coefficient resistor PTC.
4. The high voltage protection device of a three-phase input switching power supply according to claim 1, wherein a circuit formed by connecting the auxiliary relay circuit and the PTC in parallel is connected in series with the starting resistor R.
5. A high voltage protection arrangement for a three phase input switching power supply according to claim 1 wherein each main relay is connected in parallel with a circuit comprising a normally open auxiliary contact relay connected in parallel with a PTC and then in series with a start-up resistor.
6. The high voltage protection device of a three-phase input switching power supply according to claim 1, wherein the control of the main relay and the auxiliary relay is performed by detection of a three-phase ac input voltage and a rectified dc voltage, and the control circuit performs protection of the three-phase ac input high voltage and the rectified dc high voltage by on and off control of the main relay and the auxiliary relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110046245.8A CN112803371A (en) | 2021-01-14 | 2021-01-14 | High-voltage protection device of three-phase input switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110046245.8A CN112803371A (en) | 2021-01-14 | 2021-01-14 | High-voltage protection device of three-phase input switching power supply |
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| CN112803371A true CN112803371A (en) | 2021-05-14 |
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| CN202110046245.8A Pending CN112803371A (en) | 2021-01-14 | 2021-01-14 | High-voltage protection device of three-phase input switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191550A (en) * | 2023-03-29 | 2023-05-30 | 苏州博沃创新能源科技有限公司 | Household optical storage and charging integrated system based on SiC |
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2021
- 2021-01-14 CN CN202110046245.8A patent/CN112803371A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116191550A (en) * | 2023-03-29 | 2023-05-30 | 苏州博沃创新能源科技有限公司 | Household optical storage and charging integrated system based on SiC |
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