CN112881937B - Safety detection device and method for direct-current power supply system - Google Patents
Safety detection device and method for direct-current power supply system Download PDFInfo
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- CN112881937B CN112881937B CN202110113154.1A CN202110113154A CN112881937B CN 112881937 B CN112881937 B CN 112881937B CN 202110113154 A CN202110113154 A CN 202110113154A CN 112881937 B CN112881937 B CN 112881937B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The application discloses a safety detection device and a safety detection method for a direct current power supply system, which are used for detecting whether the positive polarity and the negative polarity of a direct current power supply are reversely connected. The power supply system comprises a direct current power supply and a load, wherein the output end of the direct current power supply is connected with a direct current one-way conducting circuit in parallel. The safety detection device comprises a switch circuit, an output feedback circuit, an auxiliary power supply, a control unit and a first current limiting circuit; the positive pole of the auxiliary power supply is connected with the positive pole of the load, the negative pole of the auxiliary power supply is connected with the negative pole of the load, and the switching circuit and the first current-limiting circuit are connected between the auxiliary power supply and the load; the auxiliary power supply voltage is lower than the starting voltage of the load; the output feedback circuit feeds back whether the loop current is generated after the switching circuit is switched on to the control unit; the control unit controls the switch circuit to be switched on and obtains a feedback signal output by the output feedback circuit before the direct current power supply is started, and if the feedback signal indicates that loop current is generated after the switch circuit is switched on, the control unit judges that the positive polarity and the negative polarity of the direct current power supply are connected reversely.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a safety detection device and method for a direct-current power supply system.
Background
When the load is powered by the DC power supply, if the positive and negative polarities of the DC power supply are reversed, the equipment/personal accident is easily caused, so that it is necessary to detect whether the positive and negative polarities of the DC power supply are reversed in advance.
The water electrolysis hydrogen production system comprises a hydrogen production power supply and an electrolytic tank, wherein oxygen and hydrogen are respectively generated at two poles of the electrolytic tank after the electrolytic tank is connected with the hydrogen production power supply, if the positive and negative polarities of the hydrogen production power supply are connected in reverse, oxygen and hydrogen are generated at the opposite polarity ends of the electrolytic tank, so that the explosion accident caused by hydrogen and oxygen mixing is easily caused, and therefore, whether the positive and negative polarities of the hydrogen production power supply are connected in reverse or not needs to be detected in advance.
Disclosure of Invention
In view of this, the present invention provides a safety detection device and method for a dc power supply system, so as to detect whether the positive and negative polarities of a dc power supply are reversed.
A safety detection device of a direct current power supply system comprises a direct current power supply and a load; the input end of the load is connected to the output end of the direct current power supply; the output end of the direct current power supply is connected with a direct current one-way conducting circuit in parallel;
safety inspection device includes switching circuit, output feedback circuit, auxiliary power supply, the control unit and first current-limiting circuit, wherein:
the positive electrode of the auxiliary power supply is connected with the positive electrode of the load, the negative electrode of the auxiliary power supply is connected with the negative electrode of the load, and the switching circuit and the first current limiting circuit are connected between the auxiliary power supply and the load;
the output voltage of the auxiliary power supply is lower than the starting voltage of the load;
the output feedback circuit is used for feeding back whether loop current is generated after the switching circuit is switched on to the control unit;
the control unit is used for controlling the switching circuit to be switched on and acquiring a feedback signal output by the output feedback circuit before the direct-current power supply is started, and if the feedback signal indicates that loop current is generated after the switching circuit is switched on, the direct-current power supply is judged to have reversed positive and negative polarities, otherwise, the direct-current power supply does not have reversed positive and negative polarities.
Optionally, the switching circuit is connected between the auxiliary power supply and the load, and means that:
the switch circuit is connected between the positive electrode of the auxiliary power supply and the positive electrode of the load; or, the switch circuit is connected between the negative electrode of the auxiliary power supply and the negative electrode of the load; alternatively, the switching circuits are connected one each between the positive electrode of the auxiliary power supply and the positive electrode of the load, and between the negative electrode of the auxiliary power supply and the negative electrode of the load.
Optionally, the first current limiting circuit is connected between the auxiliary power supply and the load, and means that:
the first current limiting circuit is connected between the positive electrode of the auxiliary power supply and the positive electrode of the load; or, the first current limiting circuit is connected between the negative electrode of the auxiliary power supply and the negative electrode of the load; or, the first current limiting circuit is connected between the positive electrode of the auxiliary power supply and the positive electrode of the load, and the first current limiting circuit is connected between the negative electrode of the auxiliary power supply and the negative electrode of the load.
Optionally, the switching circuit includes: the control power supply, the controllable switch, the second current limiting circuit, the controllable isolation device and the optocoupler are connected; the controllable isolating device comprises a control part and a switch part which are isolated from each other, wherein when the control part is powered on, the switch part is switched on, and when the control part is powered off, the switch part is switched off;
the control component of the controllable isolation device, the controllable switch and the second current limiting device are connected in series and then connected between the anode of the control power supply and the cathode of the control power supply; the control unit controls the on and off of the switch circuit by controlling the on and off of the controllable switch; a switch component of the controllable isolation device is connected in series with a light emitting diode of the optocoupler and then connected between the auxiliary power supply and the load;
the output feedback circuit comprises a third current limiting device; the third current limiting device is connected between the positive electrode of the control power supply and the collector electrode of the triode in the optocoupler, the emitter electrode of the triode in the optocoupler is connected with the negative electrode of the control power supply, and the voltage of the collector electrode of the triode in the optocoupler is a feedback signal output to the control unit.
Optionally, the control unit turns off the switch circuit after determining that the positive and negative polarities of the dc power supply are not inverted and before the dc power supply is started.
Optionally, a backflow prevention circuit is further disposed between the load and the safety detection device.
Optionally, when a backflow prevention circuit is further disposed between the load and the safety detection device, the control unit is further configured to control the switch circuit to continue to be kept in the on state and obtain a feedback signal output by the output feedback circuit again after the dc power supply is started, and determine that an output short circuit or an output low impedance fault exists in the dc power supply if the feedback signal indicates that a loop current is generated after the switch circuit is turned on, and otherwise, determine that the output short circuit or the output low impedance fault does not exist.
Optionally, the direct current unidirectional conducting circuit is a rectifier bridge and a filter capacitor connected in parallel, or the direct current unidirectional conducting circuit is a rectifier bridge, or the direct current unidirectional conducting circuit is a diode, or the direct current unidirectional conducting circuit is a controllable switch connected with the diode in series.
A safety detection method of a direct current power supply system comprises a direct current power supply and a load; the input end of the load is connected to the output end of the direct current power supply; the output end of the direct current power supply is connected with a direct current one-way conducting circuit in parallel;
safety inspection device includes switching circuit, output feedback circuit, auxiliary power supply, the control unit and first current-limiting circuit, wherein: the positive electrode of the auxiliary power supply is connected with the positive electrode of the load, the negative electrode of the auxiliary power supply is connected with the negative electrode of the load, and the switching circuit and the first current limiting circuit are connected between the auxiliary power supply and the load; the output voltage of the auxiliary power supply is lower than the starting voltage of the load; the output feedback circuit is used for feeding back whether loop current is generated after the switching circuit is switched on to the control unit;
the safety detection method comprises the following steps: the control unit controls the switch circuit to be switched on and obtains a feedback signal output by the output feedback circuit before the direct-current power supply is started, if the feedback signal indicates that loop current is generated after the switch circuit is switched on, the direct-current power supply is judged to have reversed positive and negative polarities, and otherwise, the direct-current power supply does not have reversed positive and negative polarities.
Optionally, the security detection method further includes: and after the positive polarity and the negative polarity of the direct current power supply are judged to be not opposite, and before the direct current power supply is started, the switching circuit is turned off.
Optionally, a backflow prevention circuit is further disposed between the load and the safety detection device.
Optionally, when a backflow prevention circuit is further disposed between the load and the safety detection device, the safety detection method further includes: and the control unit controls the switch circuit to continuously keep the switch-on state and to obtain the feedback signal output by the output feedback circuit again after the direct current power supply is started, and if the feedback signal indicates that loop current is generated after the switch circuit is switched on, the direct current power supply is judged to have an output short circuit or an output low impedance fault, otherwise, the direct current power supply does not have the output short circuit or the output low impedance fault.
According to the technical scheme, the switching circuit is controlled to be switched on and the current state of the switching circuit is obtained before the direct-current power supply is started, and the control unit can judge whether the direct-current power supply is reversely connected with the positive polarity or the negative polarity according to the current state of the switching circuit because the direct-current power supply is different from the corresponding current state of the switching circuit when the positive polarity or the negative polarity is not reversely connected, so that the safety performance of the direct-current power supply system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a safety detection device of a dc power supply system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another switching power supply disclosed in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of another switching power supply according to an embodiment of the disclosure;
fig. 4 is a schematic structural diagram of another switching power supply according to an embodiment of the disclosure;
fig. 5 is a schematic structural diagram of another safety detection device of a dc power supply system according to an embodiment of the disclosure;
fig. 6 is a flowchart of a safety detection method of a dc power supply system according to an embodiment of the present invention;
fig. 7 is a flowchart of another safety detection method for a dc power supply system according to an embodiment of the present invention.
Detailed Description
The technical solutions 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, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment of the invention discloses a safety detection device for a dc power supply system. The dc power supply system includes a dc power supply 11 and a load 12, wherein: the input end of the load 12 is connected to the output end of the direct current power supply 11; the output end of the direct current power supply 11 is connected in parallel with a direct current unidirectional conducting circuit 13.
Optionally, the dc unidirectional conducting circuit 13 is a rectifier bridge connected in parallel with a filter capacitor C1 (as shown in fig. 1), or the dc unidirectional conducting circuit 13 is a rectifier bridge (as shown in fig. 2), or the dc unidirectional conducting circuit 13 is a diode (as shown in fig. 3), or the dc unidirectional conducting circuit 13 is a diode D10 connected in series with a controllable switch SW2 (as shown in fig. 4). The core device of the rectifier bridge shown in fig. 1 and fig. 2 is a rectifier diode, and in addition, a synchronous rectification MOS transistor may also be used as the core device of the rectifier bridge, which is not limited. The controllable switch SW2 shown in fig. 4 is used to switch on the diode D10 when the safety detection device is in operation and switch off the diode D10 when the safety detection device is not in operation, and the controllable switch SW2 is an electronic switch such as a relay, a MOS transistor, or an IGBT.
Optionally, in any of the embodiments disclosed above, the dc one-way conducting circuit 13 may be packaged inside the dc power supply 11, or may be additionally disposed outside the dc power supply 11, without limitation.
Optionally, any one of the dc power supply systems disclosed above is, for example, a water electrolysis hydrogen production system, and at this time, the dc power supply 11 and the load 12 in the dc power supply system are respectively a hydrogen production power supply and an electrolytic cell in the water electrolysis hydrogen production system.
Based on any one of the dc power supply systems disclosed above, still referring to fig. 1, the safety detection device includes a switch circuit 1, an output feedback circuit 2, an auxiliary power supply 3, a control unit 4, and a first current limiting circuit R3, and the following descriptions are referred to in detail in fig. 1) to 3):
1) the positive pole Vcc + of the auxiliary power supply 3 is connected with the positive pole P12 of the load 12, the negative pole Vcc-of the auxiliary power supply 3 is connected with the negative pole P22 of the load 12, and the switch circuit 1 and the first current limiting circuit R3 are connected between the auxiliary power supply 3 and the load 12; the switch circuit 1 has two states of on/off for turning on/off the connection between the auxiliary power supply 3 and the load 12.
Alternatively, the switch circuit 1 may be connected at any position between the auxiliary power supply 3 and the load 12, and the number of the switch circuits 1 is not limited, for example: the switch circuit 1 is connected between the positive electrode Vcc + of the auxiliary power supply 3 and the positive electrode P12 of the load 12; alternatively, the switch circuit 1 is connected between the negative terminal Vcc-of the auxiliary power supply 3 and the negative terminal P22 of the load 12; alternatively, one switch circuit 1 is connected between the positive pole Vcc + of the auxiliary power supply 3 and the positive pole P12 of the load 12, and between the negative pole Vcc-of the auxiliary power supply 3 and the negative pole P22 of the load 12;
alternatively, the first current limiting circuit R3 may be connected at any position between the auxiliary power supply 3 and the load 12, and the number of the first current limiting circuits R3 is not limited, for example: the first current limiting circuit R3 is connected between the positive electrode Vcc + of the auxiliary power supply 3 and the positive electrode P12 of the load 12; alternatively, the first current limiting circuit R3 is connected between the negative terminal Vcc-of the auxiliary power supply 3 and the negative terminal P22 of the load 12; or, a first current-limiting circuit R3 is connected between the positive terminal Vcc + of the auxiliary power supply 3 and the positive terminal P12 of the load 12, and between the negative terminal Vcc-of the auxiliary power supply 3 and the negative terminal P22 of the load 12;
the first current limiting circuit R3 is, for example, a current limiting resistor R3, and fig. 1 exemplifies only that the switch circuit 1 is connected between the positive electrode Vcc + of the auxiliary power supply 3 and the positive electrode P12 of the load 12, and the first current limiting circuit R3 is connected between the negative electrode Vcc-of the auxiliary power supply 3 and the negative electrode P22 of the load 12.
2) The output voltage of the auxiliary power supply 3 is lower than the starting voltage of the load 12;
optionally, the auxiliary power supply 3 is used to provide a low-voltage dc detection power supply, and the specific form is not limited, and may be an IC chip, a circuit unit, or the like.
3) The output feedback circuit 2 is used for feeding back whether loop current is generated after the switch circuit 1 is switched on to the control unit 4; the control unit 4 is configured to control the switching circuit 1 to turn on and obtain a feedback signal output by the output feedback circuit 2 before the dc power supply 11 is started, and determine that the positive and negative polarities of the dc power supply 11 are reversed if the feedback signal indicates that a loop current is generated after the switching circuit 1 is turned on, and otherwise, the positive and negative polarities are not reversed.
The operation principle of the safety detection device is described in detail below with reference to fig. 1 as an example:
before the dc power supply 11 is started, that is, before the dc power supply 11 does not output power, the control unit 4 sends an instruction to control the switching circuit 1 to turn on, so that the auxiliary power supply 3 is connected to the load 12 through the switching circuit 1, and simultaneously the positive Vcc + of the auxiliary power supply 3 is connected to the negative Vcc-of the auxiliary power supply 3 through the switching circuit 1, the dc unidirectional conducting circuit 13, and the first current limiting circuit R3, which satisfies the following 1.1) -1.3):
1.1) the auxiliary power supply 3 voltage is applied across the load 12, but since the auxiliary power supply 3 voltage is lower than the lowest start voltage of the load 12, the load 12 cannot start operation, and no current flows between the auxiliary power supply 3 and the load 12;
1.2) if the positive and negative polarities of the dc power supply 11 are not reversed (i.e. the positive electrode P11 of the dc power supply 11 is connected to the positive electrode P12 of the load 12, and the negative electrode P21 of the dc power supply 11 is connected to the negative electrode P22 of the load 12), the dc one-way conduction circuit 13 is not conducted (it should be noted that, if the dc one-way conduction circuit 13 has the structure shown in fig. 1, the dc power supply 11 will charge the output filter capacitor C1, and the C1 is in the dc blocking state after being fully charged, so the dc one-way conduction circuit 13 will be in the non-conduction state after being conducted for a short time, which is ignored), that is, the positive electrode Vcc + of the auxiliary power supply 3 passes through the switch circuit 1 and the dc one-way conduction circuit 13, the first current limiting circuit R3 is connected to the negative terminal Vcc of the auxiliary power supply 3, and thus no current flows through the switching circuit 1.
1.3) if the positive and negative polarities of the dc power supply 11 are reversed (i.e. the positive pole P11 of the dc power supply 11 is connected to the negative pole P22 of the load 12, and the negative pole P21 of the dc power supply 11 is connected to the positive pole P12 of the load 12), then: the dc unidirectional circuit 13 is turned on, that is, the positive terminal Vcc + of the auxiliary power supply 3 is connected to the negative terminal Vcc-of the auxiliary power supply 3 through the switch circuit 1, the dc unidirectional circuit 13, and the first current limiting circuit R3 to form a current path, and a current always flows through the switch circuit 1.
Based on the above 1.1) -1.3), before the dc power supply 11 is started, if the positive and negative polarities of the dc power supply 11 are opposite, the switching circuit 1 is turned on to generate a loop current, and the loop current flows through the switching circuit 1, otherwise, the loop current is not generated, and then before the dc power supply 11 is started, the control unit 4 can determine whether the positive and negative polarities of the dc power supply 11 are opposite by feeding back whether the loop current is generated after the switching circuit 1 is turned on to the control unit 4 through the output feedback circuit 2.
The start and stop of the dc power supply 11 are controlled by the main control unit of the dc power supply system, and the main control unit performs information interaction with the control unit 4, or all functions of the control unit 4 may be directly integrated into the main control unit, so as to save the hardware cost of additionally setting one control unit 4.
Alternatively, based on any of the embodiments disclosed above, still referring to fig. 1, the switching circuit 1 includes: the control power supply, the controllable switch SW1, the second current limiting circuit R1, the controllable isolation device U1 and the optical coupler U2; the controllable isolation device U1 comprises a control component and a switch component which are isolated from each other, wherein when the control component is powered on, the switch component is switched on, and when the control component is powered off, the switch component is switched off;
the control part of the controllable isolation device U1, the controllable switch SW1 and the second current limiting circuit R1 are connected in series and then connected between the anode Vdd of the control power supply and the cathode GND of the control power supply; the control unit 4 controls the on and off of the switch circuit 1 by controlling the on and off of the controllable switch SW1, and the controllable switch SW1 can be an electronic switch such as a relay, an MOS transistor or an IGBT; the second current limiting circuit R1 is, for example, a current limiting resistor R1; the controllable isolation device U1 is, for example, a relay U1, and the control part and the switch part of the controllable isolation device U1 are, in this case, a coil and a contact switch of the relay U1, respectively;
the switch component of the controllable isolation device U1 is connected in series with the light emitting diode of the optocoupler U2 and then connected between the auxiliary power supply 3 and the load 12 (fig. 1 only takes as an example that the switch component of the controllable isolation device U1 is connected in series with the light emitting diode of the optocoupler U2 and then connected between the positive electrode Vcc + of the auxiliary power supply 3 and the positive electrode P12 of the load 12).
Still referring to fig. 1, the output feedback circuit 2 includes a third current limiting circuit R2, the third current limiting circuit R2 is connected between the positive electrode Vdd of the control power supply and the collector of the transistor in the optocoupler U2, the emitter of the transistor in the optocoupler U2 is connected to the negative electrode GND of the control power supply, and the collector voltage of the transistor in the optocoupler U2 is a feedback signal output to the control unit 4; the third current limiting circuit R2 is, for example, a current limiting resistor R2.
Besides the relay U1, the controllable isolation device U1 may also be replaced by an optocoupler, and when the controllable isolation device U1 adopts the optocoupler, the control part and the switch part of the controllable isolation device U1 are respectively a light emitting diode and a triode of the optocoupler. Fig. 1 is only drawn by taking the controllable isolation device U1 as the relay U1 as an example. The following description will be made of the working principle of the switching circuit 1 and the output feedback circuit 2, taking the relay U1 as an example of the controllable isolation device U1:
before the dc power supply 11 is started, the control unit 4 issues a command to control the controllable switch SW1 to close, the controllable switch SW1 closes the coil of the subsequent electrical appliance U1 to get power, so that the contact switch of the relay U1 is closed, the voltage of the auxiliary power supply 3 is applied across the load 12, but since the voltage of the auxiliary power supply 3 is lower than the lowest starting voltage of the load 12, the load 12 cannot start running, and no current flows between the auxiliary power supply 3 and the load 12. Meanwhile, if the positive and negative polarities of the direct current power supply 11 are not opposite, the direct current unidirectional conduction circuit 13 is not conducted, no current flows through a light emitting diode in the optocoupler U2, a triode in the optocoupler U2 is not conducted, and the collector voltage of the triode is equal to the voltage Vdd of the control power supply. On the contrary, if the polarity of the dc power supply 11 is reversed, the dc unidirectional conducting circuit 13 is turned on, and a current flows through a light emitting diode in the optocoupler U2, so that a transistor in the optocoupler U2 is turned on, and at this time, the voltage at the collector of the transistor in the optocoupler U2 is pulled down to be close to 0V. Therefore, the control unit 4 can distinguish whether the dc power supply 11 has the reverse positive and negative polarities according to the voltage of the transistor collector in the optocoupler U2.
It should be noted that, in any of the embodiments disclosed above, after determining that the positive polarity and the negative polarity of the dc power supply 11 are not reversed, the switch circuit 1 needs to be turned off first, and then the dc power supply 11 needs to be turned on, so as to prevent the energy of the dc power supply 11 from flowing back to the safety detection device. Alternatively, a backflow prevention circuit D1 may be provided between the load 12 and the safety detection device, for example, as shown in fig. 5, in which the dc power supply 11 can be directly started without turning off the switch circuit 1 after it is determined that there is no negative or positive polarity inversion in the dc power supply 11.
Optionally, in the case that the backflow prevention circuit D1 is provided, after the dc power supply 11 is started, the control unit 4 may further determine whether an output short circuit or an output low impedance fault short circuit exists in the dc power supply 11 according to a feedback signal output by the output feedback circuit 2. The feedback signal when the output short circuit or the output low impedance fault short circuit exists in the direct current power supply 11 is the same as the feedback signal when the positive and negative polarities of the direct current power supply 11 are opposite, and the feedback signal when the output short circuit or the output low impedance fault short circuit does not exist in the direct current power supply 11 is the same as the feedback signal when the positive and negative polarities of the direct current power supply 11 are opposite. That is to say, after the dc power supply 11 is started, the control unit 4 controls the switching circuit 1 to continue to be kept in the on state and to obtain the feedback signal output by the output feedback circuit 2 again, and if the feedback signal indicates that the switching circuit 1 generates a loop current after being turned on, it is determined that the dc power supply 11 has an output short circuit or an output low impedance fault, otherwise, the output short circuit and the output low impedance fault do not exist.
Corresponding to the device embodiment, the embodiment of the invention also discloses a safety detection method of the direct current power supply system, wherein the direct current power supply system comprises a direct current power supply and a load; the input end of the load is connected to the output end of the direct current power supply; the output end of the direct current power supply is connected with a direct current one-way conducting circuit in parallel;
safety inspection device includes switching circuit, output feedback circuit, auxiliary power supply, the control unit and first current-limiting circuit, wherein: the positive electrode of the auxiliary power supply is connected with the positive electrode of the load, the negative electrode of the auxiliary power supply is connected with the negative electrode of the load, and the switching circuit and the first current limiting device are connected between the auxiliary power supply and the load in series; the output voltage of the auxiliary power supply is lower than the starting voltage of the load; the output feedback circuit is used for feeding back the current change generated after the switching circuit is switched on to the control unit;
as shown in fig. 6, the security detection method includes:
step S11: before the direct-current power supply is started, the control unit controls the switch circuit to be switched on; thereafter, the flow proceeds to step S12;
step S12: acquiring a feedback signal output by the output feedback circuit;
step S13: judging whether the feedback signal indicates that loop current is generated after the switching circuit is switched on, if so, entering step S14; if not, go to step S15;
step S14: judging that the positive polarity and the negative polarity of the direct current power supply are reversely connected until the control is finished;
step S15: and judging that the positive polarity and the negative polarity of the direct current power supply are not reversed, and ending the control.
Optionally, the security detection method further includes: and after the positive and negative polarities of the direct current power supply are judged to be not reversed, and before the direct current power supply is started, the switching circuit is turned off.
Or, under the condition that a backflow prevention circuit is further arranged between the load and the safety detection device, the safety detection method further comprises the following steps: and after the positive polarity and the negative polarity of the direct current power supply are judged to be not reversed and before the direct current power supply is started, the switching circuit is kept in a turn-on state.
Optionally, in a case that a backflow prevention circuit is further disposed between the load and the safety detection device, the safety detection method further includes: and after the direct current power supply is started, judging whether the direct current power supply has an output short circuit or an output low impedance fault according to the feedback signal output by the output feedback circuit. A corresponding method flowchart is shown in fig. 7, including:
step S01: the control unit controls the switch circuit to be switched on before the direct-current power supply is started; thereafter, the flow proceeds to step S02;
step S02: acquiring a feedback signal output by the output feedback circuit; thereafter, the flow proceeds to step S03;
step S03: judging whether the feedback signal indicates that loop current is generated after the switching circuit is switched on, if not, entering step S04; if yes, go to step S09;
step S04: judging that the positive and negative polarities of the direct current power supply are not reversed, and then entering a step S05;
step S05: keeping the switching circuit in an on state; after the direct-current power supply is started, acquiring a feedback signal output by the output feedback circuit again;
step S06: judging whether the feedback signal indicates that loop current is generated after the switching circuit is switched on, if so, entering step S07; if not, go to step S08;
step S07: and judging that the direct current power supply has an output short circuit or an output low impedance fault, and ending the control.
Step S08: and judging that the direct current power supply has no output short circuit and output low impedance fault, and ending the control.
Step S09: and judging that the positive polarity and the negative polarity of the direct current power supply are reversed, and ending the control.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The method disclosed by the embodiment corresponds to the device disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the device part for description.
The terms "first," "second," and the like in the description and claims of the present invention and in the preceding drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, identical element in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. The safety detection device of the direct current power supply system is characterized in that the direct current power supply system comprises a direct current power supply and a load; the input end of the load is connected to the output end of the direct current power supply; the output end of the direct current power supply is connected with a direct current one-way conducting circuit in parallel;
safety inspection device includes switch circuit, output feedback circuit, auxiliary power supply, the control unit and first current limiting circuit, wherein:
the positive electrode of the auxiliary power supply is connected with the positive electrode of the load, the negative electrode of the auxiliary power supply is connected with the negative electrode of the load, and the switching circuit and the first current limiting circuit are connected between the auxiliary power supply and the load;
the output voltage of the auxiliary power supply is lower than the starting voltage of the load;
the output feedback circuit is used for feeding back whether loop current is generated after the switching circuit is switched on to the control unit;
the control unit is used for controlling the switching circuit to be switched on and acquiring a feedback signal output by the output feedback circuit before the direct-current power supply is started, and if the feedback signal indicates that loop current is generated after the switching circuit is switched on, the fact that the positive polarity and the negative polarity of the direct-current power supply are connected reversely is judged, otherwise, the fact that the positive polarity and the negative polarity are connected reversely does not exist.
2. The safety detection device of the dc power supply system according to claim 1, wherein the switching circuit is connected between the auxiliary power supply and the load, and is configured to:
the switch circuit is connected between the positive electrode of the auxiliary power supply and the positive electrode of the load; or, the switch circuit is connected between the negative electrode of the auxiliary power supply and the negative electrode of the load; alternatively, the switching circuits are connected one each between the positive electrode of the auxiliary power supply and the positive electrode of the load, and between the negative electrode of the auxiliary power supply and the negative electrode of the load.
3. The safety detection device of the dc power supply system according to claim 1, wherein the first current limiting circuit is connected between the auxiliary power supply and the load, and is configured to:
the first current limiting circuit is connected between the positive electrode of the auxiliary power supply and the positive electrode of the load; or, the first current limiting circuit is connected between the negative electrode of the auxiliary power supply and the negative electrode of the load; or, the first current limiting circuit is connected between the positive electrode of the auxiliary power supply and the positive electrode of the load, and the first current limiting circuit is connected between the negative electrode of the auxiliary power supply and the negative electrode of the load.
4. The safety detection device for a dc power supply system according to claim 1, wherein the switching circuit comprises: the control power supply, the controllable switch, the second current limiting circuit, the controllable isolation device and the optocoupler are connected; the controllable isolating device comprises a control part and a switch part which are isolated from each other, wherein when the control part is powered on, the switch part is switched on, and when the control part is powered off, the switch part is switched off;
the control component of the controllable isolation device, the controllable switch and the second current limiting circuit are connected in series and then connected between the anode of the control power supply and the cathode of the control power supply; the control unit controls the on and off of the switch circuit by controlling the on and off of the controllable switch; a switch component of the controllable isolation device is connected in series with a light emitting diode of the optocoupler and then connected between the auxiliary power supply and the load;
the output feedback circuit comprises a third current limiting device; the third current limiting device is connected between the positive electrode of the control power supply and the collector electrode of the triode in the optocoupler, the emitter electrode of the triode in the optocoupler is connected with the negative electrode of the control power supply, and the voltage of the collector electrode of the triode in the optocoupler is a feedback signal output to the control unit.
5. The safety detection device for a dc power supply system according to claim 1, wherein the control unit turns off the switch circuit after determining that the positive and negative polarities of the dc power supply are not inverted and before the dc power supply is turned on.
6. The safety detection device for the power supply system of the direct current power supply according to claim 1, wherein a back flow prevention circuit is further provided between the load and the safety detection device.
7. The safety detection device of the dc power supply system according to claim 6, wherein the control unit is further configured to control the switch circuit to continue to be kept in the on state and obtain the feedback signal output by the output feedback circuit again after the dc power supply is started, and determine that there is an output short circuit or an output low impedance fault in the dc power supply if the feedback signal indicates that a loop current is generated after the switch circuit is turned on, and otherwise, there is no output short circuit or output low impedance fault.
8. The safety detecting device for a dc power supply system according to claim 1, wherein:
the direct current one-way conducting circuit is a rectifier bridge and a filter capacitor connected in parallel, or the direct current one-way conducting circuit is a rectifier bridge, or the direct current one-way conducting circuit is a diode, or the direct current one-way conducting circuit is a controllable switch connected with the diode in series.
9. The safety detection method of the direct current power supply system is characterized in that the direct current power supply system comprises a direct current power supply and a load; the input end of the load is connected to the output end of the direct current power supply; the output end of the direct current power supply is connected with a direct current one-way conducting circuit in parallel;
safety inspection device includes switch circuit, output feedback circuit, auxiliary power supply, the control unit and first current limiting circuit, wherein: the positive electrode of the auxiliary power supply is connected with the positive electrode of the load, the negative electrode of the auxiliary power supply is connected with the negative electrode of the load, and the switching circuit and the first current limiting circuit are connected between the auxiliary power supply and the load; the output voltage of the auxiliary power supply is lower than the starting voltage of the load; the output feedback circuit is used for feeding back whether loop current is generated after the switching circuit is switched on to the control unit;
the safety detection method comprises the following steps: the control unit controls the switch circuit to be switched on and obtains a feedback signal output by the output feedback circuit before the direct current power supply is started, if the feedback signal indicates that loop current is generated after the switch circuit is switched on, the fact that the positive polarity and the negative polarity of the direct current power supply are connected reversely is judged, and otherwise, the fact that the positive polarity and the negative polarity are connected reversely does not exist.
10. The safety detection method of the dc power supply system according to claim 9, further comprising: and after the positive and negative polarities of the direct current power supply are judged to be not reversed, and before the direct current power supply is started, the switching circuit is turned off.
11. The safety detection method for the power supply system of the direct current power supply according to claim 9, wherein a backflow prevention circuit is further provided between the load and the safety detection device.
12. The safety detection method of the dc power supply system according to claim 11, further comprising: and the control unit controls the switch circuit to be continuously kept in a turn-on state and to obtain a feedback signal output by the output feedback circuit again after the direct-current power supply is started, and if the feedback signal indicates that loop current is generated after the switch circuit is turned on, the direct-current power supply is judged to have an output short circuit or an output low-impedance fault, otherwise, the direct-current power supply does not have the output short circuit or the output low-impedance fault.
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| CN202110113154.1A CN112881937B (en) | 2021-01-27 | 2021-01-27 | Safety detection device and method for direct-current power supply system |
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| CN114002976B (en) * | 2021-10-20 | 2023-08-11 | 许继集团有限公司 | Control detection circuit and detection method |
| CN115201554B (en) * | 2022-09-16 | 2023-01-13 | 中车工业研究院(青岛)有限公司 | No-load overcurrent detection circuit and no-load overcurrent detection system |
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Effective date of registration: 20220811 Address after: 230000 room 616, Baiyan Industrial Service Center, 188 Mingchuan Road, high tech Zone, Hefei, Anhui Province Patentee after: Sunshine Hydrogen Energy Technology Co.,Ltd. Address before: 230088 No. 1699 Xiyou Road, Hefei High-tech Zone, Anhui Province Patentee before: SUNGROW POWER SUPPLY Co.,Ltd. |