CN109950879B - Charging protection device and method for power utilization circuit and circuit with charging protection function - Google Patents
Charging protection device and method for power utilization circuit and circuit with charging protection function Download PDFInfo
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- CN109950879B CN109950879B CN201910153710.0A CN201910153710A CN109950879B CN 109950879 B CN109950879 B CN 109950879B CN 201910153710 A CN201910153710 A CN 201910153710A CN 109950879 B CN109950879 B CN 109950879B
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Abstract
The invention relates to a charging protection device and a method of a power utilization circuit and a circuit with charging protection, wherein the charging protection device comprises: a charging circuit connected in series between a power supply and a power consuming circuit, the power consuming circuit including: the electric equipment and the charging device are connected in parallel; the detection circuit is used for detecting a circuit parameter value of the charging circuit; and the control circuit is used for controlling the charging circuit to be connected or disconnected according to the circuit parameter value so as to charge the charging device by adopting the power supply when the charging circuit is connected and stop charging the charging device when the charging circuit is disconnected. The detection circuit detects the circuit parameter value of the charging circuit, the control circuit judges whether the power supply has the problems of reverse positive and negative connection, power supply voltage, load circuit abnormity and the like according to the circuit parameter value, and short-circuit protection is carried out in time when the circuit is abnormal, so that further expansion of faults and damage of electric equipment are avoided.
Description
Technical Field
The invention relates to the technical field of charging control, in particular to a charging protection device and method for a power utilization circuit and a circuit with charging protection.
Background
In direct current electric equipment and power lines of a direct current micro-grid, the phenomena of reverse connection of positive and negative polarities or short circuit of the lines often occur, and power electronic components can be damaged in a very short time due to the reverse connection of the positive and negative polarities of the direct current or the short circuit of the lines. In addition, if a front end of a general dc power device has a large capacitive device, a large inrush current may be generated at the moment of power-on.
In the prior art, a charging loop is added, an impact current occurs at the moment of switching on a power supply, the impact current firstly passes through the charging loop, and the charging loop is switched off through the loop after the impact current disappears, so that the charging loop enters a normal use state. However, the existing protection measures are difficult to accurately predict the accurate time for the disappearance of the impact current, and are difficult to effectively identify and protect the impact current in a very short time, which often leads to further expansion of the fault and influences the use of a direct current system; the reverse access of a circuit cannot be avoided in the prior art, and the short-circuit protection cannot be effectively carried out after the reverse access occurs, so that a charging circuit is easy to damage.
Disclosure of Invention
In view of the above, the present invention provides a charging protection device and method for a power utilization circuit, and a circuit with charging protection.
In order to achieve the purpose, the invention adopts the following technical scheme: a charge protection device for a power consuming circuit, comprising:
a charging circuit connected in series between a power supply and a power consuming circuit, the power consuming circuit including: the electric equipment and the charging device are connected in parallel;
the detection circuit is used for detecting a circuit parameter value of the charging circuit;
and the control circuit is used for controlling the charging circuit to be connected or disconnected according to the circuit parameter value so as to charge the charging device by adopting the power supply when the charging circuit is connected and stop charging the charging device when the charging circuit is disconnected.
Optionally, the charging circuit includes:
the charging circuit comprises a charging resistor, a first relay and a second relay;
the charging resistor is connected with the first relay in series to form a series circuit;
the second relay is connected with the series circuit in parallel to form a parallel circuit;
the first parallel connection point of the parallel circuit is connected with the power supply source, and the second parallel connection point of the parallel circuit is connected with the power utilization circuit.
Optionally, the detection circuit includes:
and the voltage sensor is used for detecting a first voltage value and/or a second voltage value, wherein the first voltage value is the voltage value of the first parallel connection point, and the second voltage value is the voltage value of the second parallel connection point.
Optionally, the control circuit includes:
the processor is used for generating a judgment result according to preset parameters, the first voltage value and the second voltage value;
and the controller is used for controlling the first relay and/or the second relay to be closed or disconnected according to the judgment result of the processor so as to connect or disconnect the charging circuit.
Optionally, the charging protection device further includes:
and the alarm module is used for displaying and/or playing alarm information according to the judgment result.
Optionally, the circuit parameter values include: a first voltage value and a second voltage value, the processor being specifically configured to perform at least one of:
when the first voltage value is not equal to the preset rated voltage, generating a first judgment result, and triggering the alarm module to display and/or play alarm information according to the first judgment result to indicate that the voltage of the power supply is abnormal;
when the first voltage value is equal to a preset rated voltage, generating a second judgment result, and triggering the controller to control the first relay to be closed according to the second judgment result;
when the first relay is closed and the first voltage value is smaller than the second voltage value, generating a third judgment result, triggering alarm information displayed and/or played by the alarm module according to the third judgment result to indicate that the power supply is abnormal in positive and negative connection, and triggering the controller to control the first relay to be disconnected according to the third judgment result;
when the first relay is closed and the first voltage value is greater than or equal to the second voltage value, calculating charging current according to the first voltage value, the second voltage value and the resistance value of the charging resistor, and calculating rated current according to preset rated voltage and the resistance value of the charging resistor;
when the duration time that the charging current is equal to the rated current is longer than a first time threshold, generating a fourth judgment result, triggering alarm information displayed and/or played by the alarm module according to the fourth judgment result to indicate that the short circuit of the circuit is abnormal, and triggering the controller to control the first relay to be disconnected according to the fourth judgment result;
if the charging device is a charging capacitor, when the duration time that the charging current is equal to the rated current is less than or equal to a first time threshold, judging whether the charging current conforms to a preset capacitor charging index reduction curve, if not, generating a fifth judgment result, triggering an alarm module to display and/or play alarm information according to the fifth judgment result to indicate that the line characteristic is abnormal, and triggering a controller to control a first relay to be switched off according to the fifth judgment result;
when the charging current conforms to a preset capacitance charging index reduction curve, after a preset second time threshold, judging whether the charging current is smaller than the preset charging current threshold, if not, generating a sixth judgment result, triggering an alarm module to display and/or play alarm information according to the sixth judgment result to indicate that the line characteristic is abnormal, and triggering a controller to control a first relay to be switched off according to the sixth judgment result;
if the charging current is smaller than a preset charging current threshold value, generating a seventh judgment result, triggering the controller to control the first relay to be switched off and control the second relay to be switched on according to the seventh judgment result;
after the first relay is disconnected and the second relay is closed, whether the difference value between the first voltage value and the second voltage value is larger than a preset voltage difference threshold value or not is judged according to a preset period, if the difference value is larger than the preset voltage difference threshold value, an eighth judgment result is generated, an alarm module is triggered to display and/or play alarm information according to the eighth judgment result to indicate that the line is abnormal in overcurrent, and the controller is triggered to control the second relay to be disconnected according to the eighth judgment result.
Optionally, the charging protection device further includes:
and the power supply module is used for supplying power to the detection circuit and the control circuit.
Optionally, the output end of the power module is connected to the detection circuit and the control circuit respectively, and the input end of the power module is connected to the power supply, so as to adopt the power supply to supply power to the power module.
The invention also provides a circuit with a charging protection function, which comprises:
a charge protection device as claimed in any preceding claim; and the number of the first and second groups,
a power supply and a power utilization circuit;
the charging protection device is connected between the power supply and the power utilization circuit in series;
the power utilization circuit includes: the electric equipment and the charging device are connected in parallel.
Optionally, the electric equipment is direct current electric equipment, and the power supply is a direct current power supply.
Optionally, the charging device is a capacitor.
The invention also provides a charging protection method of the power utilization circuit, which comprises the following steps:
detecting a circuit parameter value of a charging circuit, the charging circuit being configured to charge a charging device of a power consuming circuit with a power supply when the charging circuit is connected and to stop charging the charging device when the charging circuit is disconnected, the power consuming circuit including: the electric equipment and the charging device are connected in parallel;
processing according to the circuit parameter values, the processing comprising: and controlling the charging circuit to be connected or disconnected.
Optionally, the charging circuit includes:
the charging circuit comprises a charging resistor, a first relay and a second relay;
the charging resistor is connected with the first relay in series to form a series circuit;
the second relay is connected with the series circuit in parallel to form a parallel circuit;
a first parallel connection point of the parallel circuit is connected with the power supply source, and a second parallel connection point of the parallel circuit is connected with the circuit;
the circuit parameter values include: the first voltage value is the voltage value of the first parallel connection point, and the second voltage value is the voltage value of the second parallel connection point.
Optionally, the processing further includes: and displaying and/or playing alarm information according to the circuit parameter value.
Optionally, the processing includes at least one of:
when the first voltage value is not equal to a preset rated voltage, displaying and/or playing alarm information indicating that the voltage of the power supply is abnormal;
when the first voltage value is equal to a preset rated voltage, controlling the first relay to be closed;
when the first relay is closed and the first voltage value is smaller than the second voltage value, displaying and/or playing alarm information indicating that the power supply is abnormal in positive and negative connection, and controlling the first relay to be disconnected;
when the first relay is closed and the first voltage value is greater than or equal to the second voltage value, calculating charging current according to the first voltage value, the second voltage value and the resistance value of the charging resistor, and calculating rated current according to preset rated voltage and the resistance value of the charging resistor;
when the duration time that the charging current is equal to the rated current is longer than a first time threshold, displaying and/or playing alarm information indicating that the short circuit of the circuit is abnormal, and controlling the first relay to be switched off;
if the charging device is a charging capacitor, when the duration time that the charging current is equal to the rated current is less than or equal to a first time threshold, judging whether the charging current conforms to a preset capacitance charging index reduction curve, if not, displaying and/or playing alarm information indicating that the line characteristics are abnormal, and controlling the first relay to be switched off;
when the charging circuit conforms to a preset capacitance charging index reduction curve, after a preset second time threshold, judging whether the charging current is smaller than a preset charging current threshold, if not, displaying and/or playing alarm information indicating that the line characteristics are abnormal, and controlling the first relay to be switched off; if the charging current is smaller than a preset charging current threshold value, controlling the first relay to be switched off and controlling the second relay to be switched on;
after the first relay is disconnected and the second relay is closed, whether the difference value of the first voltage value and the second voltage value is larger than a preset voltage difference threshold value or not is judged according to a preset period, if yes, alarm information indicating that the line is in overcurrent abnormity is displayed and/or played, and the second relay is controlled to be disconnected.
By adopting the technical scheme, the charging protection device of the power utilization circuit comprises: a charging circuit connected in series between a power supply and a power consuming circuit, the power consuming circuit including: the electric equipment and the charging device are connected in parallel; the detection circuit is used for detecting a circuit parameter value of the charging circuit; and the control circuit is used for controlling the charging circuit to be connected or disconnected according to the circuit parameter value so as to charge the charging device by adopting the power supply when the charging circuit is connected and stop charging the charging device when the charging circuit is disconnected. The detection circuit detects the circuit parameter value of the charging circuit, the control circuit judges whether the power supply has the problems of reverse positive and negative connection, power supply voltage, load circuit abnormity and the like according to the circuit parameter value, and short-circuit protection is carried out in time when the circuit is abnormal, so that further expansion of faults and damage of electric equipment are avoided.
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 charging protection device for an electric circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a charging protection device according to a second embodiment of the power utilization circuit of the present invention;
FIG. 3 is a schematic diagram of a circuit with charge protection according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a charging protection method for an electric circuit according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a charging protection method for an electric circuit according to a second embodiment of the present invention.
In the figure: 1. a charging circuit; 2. a detection circuit; 21. a voltage sensor; 3. a control circuit; 31. a processor; 32. a controller; 4. an alarm module; 5. a power supply module; 6. a charging protection device; 7. a power supply; 8. an electricity utilization circuit; 81. an electricity-consuming device; 82. and (4) a capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a charging protection device of an electric circuit according to an embodiment of the present invention.
As shown in fig. 1, the apparatus according to the present embodiment includes:
charging circuit 1, establish ties between power supply 7 and power consumption circuit 8, power consumption circuit 8 includes: the electric device 81 and the charging device connected in parallel with each other;
a detection circuit 2 for detecting a circuit parameter value of the charging circuit 1;
and the control circuit 3 is used for controlling the charging circuit 1 to be connected or disconnected according to the circuit parameter value so as to charge the charging device by using the power supply 7 when the charging circuit is connected and stop charging the charging device when the charging circuit is disconnected.
In this embodiment, the detection circuit 2 detects the circuit parameter value of the charging circuit 1, and the control circuit 3 determines whether the power supply 7 has problems of reverse positive and negative connections, abnormal power supply voltage, abnormal load line, and the like according to the circuit parameter value, and performs short-circuit protection in time when the line is abnormal, which is beneficial to avoiding further expansion of faults and damage to the electric device 81.
Fig. 2 is a schematic structural diagram of a charging protection device of a power utilization circuit according to a second embodiment of the present invention.
As shown in fig. 2, the apparatus according to the present embodiment includes:
a charging circuit 1, a detection circuit 2 and a control circuit 3;
the charging circuit 1 is connected in series between a power supply 7 and a power utilization circuit 8, and the power utilization circuit 8 comprises: the electric device 81 and the charging device connected in parallel with each other;
further, the charging circuit 1 includes:
the charging circuit comprises a charging resistor, a first relay and a second relay;
the charging resistor is connected with the first relay in series to form a series circuit;
the second relay is connected with the series circuit in parallel to form a parallel circuit;
the first parallel connection point of the parallel circuit is connected to the power supply 7, and the second parallel connection point of the parallel circuit is connected to the power consumption circuit 8.
Further, the detection circuit 2 includes:
the voltage sensor 21 is configured to detect a first voltage value and/or a second voltage value, where the first voltage value is a voltage value of the first parallel connection point, and the second voltage value is a voltage value of the second parallel connection point.
Further, the control circuit 3 includes:
the processor 31 is configured to generate a determination result according to a preset parameter, the first voltage value, and the second voltage value;
and the controller 32 is configured to control the first relay and/or the second relay to be turned off or disconnected according to a determination result of the processor 31, so as to connect or disconnect the charging circuit 1.
Further, the charging protection device further includes:
and the alarm module 4 is used for displaying and/or playing alarm information according to the judgment result.
Further, the circuit parameter values include: the processor 31 is specifically configured to perform at least one of the following:
when the first voltage value is not equal to the preset rated voltage, generating a first judgment result, and triggering the alarm module 4 to display and/or play alarm information according to the first judgment result to indicate that the voltage of the power supply 7 is abnormal;
when the first voltage value is equal to a preset rated voltage, generating a second judgment result, and triggering the controller 32 to control the first relay to be closed according to the second judgment result;
when the first relay is closed and the first voltage value is smaller than the second voltage value, generating a third judgment result, triggering alarm information displayed and/or played by the alarm module 4 according to the third judgment result to indicate that the power supply 7 is abnormal in reverse connection of positive and negative, and triggering the controller 32 to control the first relay to be disconnected according to the third judgment result;
when the first relay is closed and the first voltage value is greater than or equal to the second voltage value, calculating charging current according to the first voltage value, the second voltage value and the resistance value of the charging resistor, and calculating rated current according to preset rated voltage and the resistance value of the charging resistor;
when the duration time that the charging current is equal to the rated current is longer than a first time threshold, generating a fourth judgment result, triggering the alarm module 4 to display and/or play alarm information according to the fourth judgment result to indicate that the short circuit of the line is abnormal, and triggering the controller 32 to control the first relay to be disconnected according to the fourth judgment result;
if the charging device is a charging capacitor 82, when the duration time that the charging current is equal to the rated current is less than or equal to a first time threshold, judging whether the charging current conforms to a preset charging index reduction curve of the capacitor 82, if not, generating a fifth judgment result, triggering an alarm message displayed and/or played by the alarm module 4 according to the fifth judgment result to indicate that the line characteristic is abnormal, and triggering the controller 32 to control the first relay to be switched off according to the fifth judgment result;
when the charging current conforms to a preset charging index reduction curve of the capacitor 82, after a preset second time threshold, judging whether the charging current is smaller than the preset charging current threshold, if not, generating a sixth judgment result, triggering the alarm module 4 to display and/or play alarm information according to the sixth judgment result to indicate that the line characteristic is abnormal, and triggering the controller 32 to control the first relay to be switched off according to the sixth judgment result;
if the charging current is smaller than a preset charging current threshold value, generating a seventh judgment result, triggering the controller 32 to control the first relay to be switched off and the second relay to be switched on according to the seventh judgment result;
after the first relay is disconnected and the second relay is closed, whether the difference value between the first voltage value and the second voltage value is larger than a preset voltage difference threshold value or not is judged according to a preset period, if the difference value is larger than the preset voltage difference threshold value, an eighth judgment result is generated, an alarm message displayed and/or played by the alarm module 4 according to the eighth judgment result is triggered to indicate that the line is abnormal in overcurrent, and the controller 32 is triggered to control the second relay to be disconnected according to the eighth judgment result.
Further, the charging protection device further includes:
and the power supply module 5 is used for supplying power to the detection circuit 2 and the control circuit 3.
Further, the output end of the power module 5 is respectively connected with the detection circuit 2 and the control circuit 3, and the input end of the power module 5 is connected with the power supply 7 so as to adopt the power supply 7 to supply power to the power module 5.
In the embodiment, the voltage sensor 21 is used for acquiring the voltage value U1 at the point R-1 and the voltage value U2 at the point R-2 in fig. 2 in real time, the processor 31 is used for generating a judgment result according to the size relationship between U1 and U2, and the controller 32 is used for controlling the first relay K1 and the second relay K2 to be closed or opened according to the judgment result of the processor 31 so as to connect or disconnect the charging circuit 1. When the processor 31 judges that the circuit is abnormal, the alarm module 4 is controlled to send alarm information, the alarm information is sent in a display and/or play mode, and the alarm information can be uploaded to an upper management terminal through a communication network, so that the management terminal can timely know the abnormality of the circuit and timely maintain the circuit.
In practical use, the charging protection device described in this embodiment may be integrated with the electric equipment 81, or may be separately installed on the line interface.
In the charging protection device of the embodiment, in the process of power-on, the voltage sensor 21 monitors the voltage values of the point R-1 and the point R-2 in the charging process in real time, and judges whether the voltage of the power supply 7 input by the charging protection device is in a specified range, the polarity of the power supply is normal, and whether a short circuit occurs in a line or not according to the magnitude relation of the voltage values of the two points, and when the voltage of the power supply 7 or the line has the short circuit abnormality, the power consumption device 81 is disconnected, so that the power consumption device 81 is protected, and further expansion of faults and damage to the power consumption device 81 are avoided; meanwhile, the charging protection device checks abnormality and controls energization, so that the electric equipment 81 is always not powered under abnormal conditions, and the protection function of the electric equipment 81 is more complete and effective.
Fig. 3 is a schematic structural diagram of a circuit with a charge protection function according to a first embodiment of the present invention.
As shown in fig. 3, the circuit according to this embodiment includes:
the charge protection device 6 as described in the previous embodiment one or embodiment two; and the number of the first and second groups,
a power supply 7 and a power utilization circuit 8;
the charging protection device 6 is connected in series between the power supply 7 and the power utilization circuit 8;
the utilization circuit 8 includes: a powered device 81 and a charging device connected in parallel with each other.
Further, the electric device 81 is a dc electric device 81, and the power supply 7 is a dc power supply.
Further, the charging device is a capacitor 82.
The circuit with the charging protection function of the embodiment adds the charging protection device 6 to the front end of the power utilization circuit 8, and the charging protection device 6 comprises the corresponding detection circuit 2 and the control circuit 3. In the process of electrifying, the charging process is monitored in real time through the detection circuit 2, whether the input power supply is in a specified range or not, whether the polarity of the power supply is normal or not and whether a short circuit is abnormal or not are judged, and therefore protection is carried out; meanwhile, the circuit described in this embodiment is first checked and then powered on, so that the power utilization circuit 8 is always not powered on under abnormal conditions, and the damage to the power utilization equipment 81 can be effectively avoided.
Fig. 4 is a schematic flow chart of a charging protection method for an electric circuit according to an embodiment of the present invention.
As shown in fig. 4, the charge protection method according to this embodiment includes:
s41: detecting a circuit parameter value of a charging circuit 1, the charging circuit 1 being configured to charge a charging device of a power consumption circuit 8 with a power supply 7 when being connected and to stop charging the charging device when being disconnected, the power consumption circuit 8 including: the electric device 81 and the charging device connected in parallel with each other;
s42: processing according to the circuit parameter values, the processing comprising: and controlling the charging circuit 1 to be connected or disconnected.
Further, the charging circuit 1 includes:
the charging circuit comprises a charging resistor, a first relay and a second relay;
the charging resistor is connected with the first relay in series to form a series circuit;
the second relay is connected with the series circuit in parallel to form a parallel circuit;
a first parallel connection point of the parallel circuit is connected with the power supply 7, and a second parallel connection point of the parallel circuit is connected with the power utilization circuit 8;
the circuit parameter values include: the first voltage value is the voltage value of the first parallel connection point, and the second voltage value is the voltage value of the second parallel connection point.
Further, the processing further comprises: and displaying and/or playing alarm information according to the circuit parameter value.
In the charging protection method of this embodiment, by detecting the circuit parameter value of the charging circuit 1, the control circuit 3 determines whether the power supply 7 has the problems of reverse positive and negative connections, abnormal power supply voltage, abnormal load line, and the like according to the circuit parameter value, and performs short-circuit protection in time when the line is abnormal, which is beneficial to avoiding further expansion of the fault and damage to the electric device 81.
Fig. 5 is a schematic flow chart of a charging protection method for the power consumption circuit 8 according to a second embodiment of the present invention.
As shown in fig. 5, the charging protection method according to this embodiment includes the following steps:
s101: collecting voltage U1 of a point R-1;
s102: judging whether the voltage U1 is equal to the rated voltage U0 of the load (namely, the circuit 8);
s103: when the first voltage value (voltage U1 at the point R-1) is not equal to the rated voltage U0, the input voltage value of the power supply 7 is abnormal, and corresponding alarm information is output;
s104: when the first voltage value is equal to rated voltage U0, controlling the first relay K1 to be closed;
s105: judging whether the first voltage value is smaller than the second voltage value (voltage U2 at the point R-2);
s106: if the first voltage value is smaller than the second voltage value, the power supply 7 generates positive and negative reverse connection abnormity, outputs corresponding alarm information, and controls the first relay K1 to be disconnected;
s107: if the first voltage value is greater than or equal to the second voltage value, calculating a charging current (U1-U2)/R according to the first voltage value, the second voltage value and the resistance value of the charging resistor R, and calculating a rated current U0/R according to a load rated voltage U0 and the resistance value of the charging resistor; judging the duration time that the charging current is equal to the rated current;
s108: if the duration time of the charging current is equal to the rated current is greater than a first time threshold t1(t1 is 1 millisecond), indicating that a short circuit abnormality occurs in a line, outputting corresponding alarm information, and controlling a first relay K1 to be disconnected;
s109: if the duration time of the charging current is equal to or less than a first time threshold t1, and when the charging device is a charging capacitor 82, judging whether the charging current conforms to a preset charging index reduction curve of the capacitor 82;
s110: if the circuit characteristics are not matched, the circuit characteristics are abnormal, corresponding alarm information is output, and the first relay K1 is controlled to be disconnected;
s111: if the charging circuit 1 meets the preset charging index reduction curve of the capacitor 82, after a preset second time threshold t2(t1 is 3 seconds), judging whether the charging current is smaller than a preset charging current threshold I0; wherein, I0 is a fixed value and defaults to the maximum current value allowed by the switching of the relay contact.
S112: if the current is not less than the preset value, indicating that the line characteristic is abnormal, outputting corresponding alarm information, and controlling the first relay K1 to be switched off;
s113: if the charging current is smaller than a preset charging current threshold value I0, controlling the first relay K1 to be opened and controlling the second relay K2 to be closed;
s114: after the first relay K1 is opened and the second relay K2 is closed, acquiring the voltage U1 of a point R-1 and the voltage U2 of a point R-2 in real time;
s115: judging whether the difference value between the first voltage value U1 and the second voltage value U2 is larger than a preset voltage difference threshold value;
s116: if the difference value between the first voltage value and the second voltage value is larger than a preset voltage difference threshold value Ug, indicating that the circuit is abnormal in overcurrent, outputting corresponding alarm information, and controlling the second relay K2 to be switched off.
In the charging protection method of this embodiment, by detecting the circuit parameter value of the charging circuit 1, the control circuit 3 determines whether the power supply 7 has the problems of reverse positive and negative connections, abnormal power supply voltage, abnormal load line, and the like according to the circuit parameter value, and performs short-circuit protection in time when the line is abnormal, which is beneficial to avoiding further expansion of the fault and damage to the electric equipment 81; the method can effectively identify the type of the line abnormity and output corresponding alarm information, and can also upload the type and state information of the line abnormity to an upper management terminal through a communication network, so that the management terminal can timely know the abnormity of the line and timely maintain the line.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A charging protection device for a power consuming circuit, comprising:
a charging circuit connected in series between a power supply and a power consuming circuit, the power consuming circuit including: the electric equipment and the charging device are connected in parallel;
the detection circuit is used for detecting a circuit parameter value of the charging circuit;
the control circuit is used for controlling the charging circuit to be connected or disconnected according to the circuit parameter value so as to charge the charging device by adopting the power supply when the charging circuit is connected and stop charging the charging device when the charging circuit is disconnected;
the charging circuit includes:
the charging circuit comprises a charging resistor, a first relay and a second relay;
the charging resistor is connected with the first relay in series to form a series circuit;
the second relay is connected with the series circuit in parallel to form a parallel circuit;
a first parallel connection point of the parallel circuit is connected with the power supply source, and a second parallel connection point of the parallel circuit is connected with the circuit;
the detection circuit includes:
the voltage sensor is used for detecting a first voltage value and/or a second voltage value, wherein the first voltage value is the voltage value of the first parallel connection point, and the second voltage value is the voltage value of the second parallel connection point;
the control circuit includes:
the processor is used for generating a judgment result according to preset parameters, the first voltage value and the second voltage value;
the controller is used for controlling the first relay and/or the second relay to be closed or disconnected according to the judgment result of the processor so as to connect or disconnect the charging circuit;
the charging protection device further includes:
the alarm module is used for displaying and/or playing alarm information according to the judgment result;
the circuit parameter values include: the processor is specifically configured to perform the following steps:
when the first voltage value is not equal to the preset rated voltage, generating a first judgment result, and triggering the alarm module to display and/or play alarm information according to the first judgment result to indicate that the voltage of the power supply is abnormal;
when the first voltage value is equal to a preset rated voltage, generating a second judgment result, and triggering the controller to control the first relay to be closed according to the second judgment result;
when the first relay is closed and the first voltage value is smaller than the second voltage value, generating a third judgment result, triggering alarm information displayed and/or played by the alarm module according to the third judgment result to indicate that the power supply is abnormal in positive and negative connection, and triggering the controller to control the first relay to be disconnected according to the third judgment result;
when the first relay is closed and the first voltage value is greater than or equal to the second voltage value, calculating charging current according to the first voltage value, the second voltage value and the resistance value of the charging resistor, and calculating rated current according to preset rated voltage and the resistance value of the charging resistor;
when the duration time that the charging current is equal to the rated current is longer than a first time threshold, generating a fourth judgment result, triggering alarm information displayed and/or played by the alarm module according to the fourth judgment result to indicate that the short circuit of the circuit is abnormal, and triggering the controller to control the first relay to be disconnected according to the fourth judgment result;
if the charging device is a charging capacitor, when the duration time that the charging current is equal to the rated current is less than or equal to a first time threshold, judging whether the charging current conforms to a preset capacitor charging index reduction curve, if not, generating a fifth judgment result, triggering an alarm module to display and/or play alarm information according to the fifth judgment result to indicate that the line characteristic is abnormal, and triggering a controller to control a first relay to be switched off according to the fifth judgment result;
when the charging current conforms to a preset capacitance charging index reduction curve, after a preset second time threshold, judging whether the charging current is smaller than the preset charging current threshold, if not, generating a sixth judgment result, triggering an alarm module to display and/or play alarm information according to the sixth judgment result to indicate that the line characteristic is abnormal, and triggering a controller to control a first relay to be switched off according to the sixth judgment result;
if the charging current is smaller than a preset charging current threshold value, generating a seventh judgment result, triggering the controller to control the first relay to be switched off and control the second relay to be switched on according to the seventh judgment result;
after the first relay is disconnected and the second relay is closed, whether the difference value between the first voltage value and the second voltage value is larger than a preset voltage difference threshold value or not is judged according to a preset period, if the difference value is larger than the preset voltage difference threshold value, an eighth judgment result is generated, an alarm module is triggered to display and/or play alarm information according to the eighth judgment result to indicate that the line is abnormal in overcurrent, and the controller is triggered to control the second relay to be disconnected according to the eighth judgment result.
2. The charging protection device of claim 1, further comprising:
and the power supply module is used for supplying power to the detection circuit and the control circuit.
3. The charging protection device of claim 2, wherein an output terminal of the power module is connected to the detection circuit and the control circuit, respectively, and an input terminal of the power module is connected to the power supply, so as to supply power to the power module by using the power supply.
4. A circuit having a charge protection function, comprising:
the charge protection device of any one of claims 1 to 3; and the number of the first and second groups,
a power supply and a power utilization circuit;
the charging protection device is connected between the power supply and the power utilization circuit in series;
the power utilization circuit includes: the electric equipment and the charging device are connected in parallel.
5. The circuit of claim 4, wherein the powered device is a DC powered device and the power supply is a DC power supply.
6. A circuit according to claim 4 or 5, wherein the charging device is a capacitor.
7. A charging protection method of a power utilization circuit is characterized by comprising the following steps:
detecting a circuit parameter value of a charging circuit, the charging circuit being configured to charge a charging device of a power consuming circuit with a power supply when the charging circuit is connected and to stop charging the charging device when the charging circuit is disconnected, the power consuming circuit including: the electric equipment and the charging device are connected in parallel;
processing according to the circuit parameter values, the processing comprising: controlling the charging circuit to be connected or disconnected;
the charging circuit includes:
the charging circuit comprises a charging resistor, a first relay and a second relay;
the charging resistor is connected with the first relay in series to form a series circuit;
the second relay is connected with the series circuit in parallel to form a parallel circuit;
a first parallel connection point of the parallel circuit is connected with the power supply source, and a second parallel connection point of the parallel circuit is connected with the circuit;
the circuit parameter values include: a first voltage value and a second voltage value, wherein the first voltage value is the voltage value of the first parallel connection point, and the second voltage value is the voltage value of the second parallel connection point;
the processing according to the circuit parameter value comprises the following steps:
when the first voltage value is not equal to a preset rated voltage, displaying and/or playing alarm information indicating that the voltage of the power supply is abnormal;
when the first voltage value is equal to a preset rated voltage, controlling the first relay to be closed;
when the first relay is closed and the first voltage value is smaller than the second voltage value, displaying and/or playing alarm information indicating that the power supply is abnormal in positive and negative connection, and controlling the first relay to be disconnected;
when the first relay is closed and the first voltage value is greater than or equal to the second voltage value, calculating charging current according to the first voltage value, the second voltage value and the resistance value of the charging resistor, and calculating rated current according to preset rated voltage and the resistance value of the charging resistor;
when the duration time that the charging current is equal to the rated current is longer than a first time threshold, displaying and/or playing alarm information indicating that the short circuit of the circuit is abnormal, and controlling the first relay to be switched off;
if the charging device is a charging capacitor, when the duration time that the charging current is equal to the rated current is less than or equal to a first time threshold, judging whether the charging current conforms to a preset capacitance charging index reduction curve, if not, displaying and/or playing alarm information indicating that the line characteristics are abnormal, and controlling the first relay to be switched off;
when the charging circuit conforms to a preset capacitance charging index reduction curve, after a preset second time threshold, judging whether the charging current is smaller than a preset charging current threshold, if not, displaying and/or playing alarm information indicating that the line characteristics are abnormal, and controlling the first relay to be switched off; if the charging current is smaller than a preset charging current threshold value, controlling the first relay to be switched off and controlling the second relay to be switched on;
after the first relay is disconnected and the second relay is closed, whether the difference value of the first voltage value and the second voltage value is larger than a preset voltage difference threshold value or not is judged according to a preset period, if yes, alarm information indicating that the line is in overcurrent abnormity is displayed and/or played, and the second relay is controlled to be disconnected.
8. The method of claim 7, wherein the processing further comprises: and displaying and/or playing alarm information according to the circuit parameter value.
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| CN111711171B (en) * | 2020-06-18 | 2022-08-19 | 广东博智林机器人有限公司 | Power protection circuit and servo driver |
| CN112398215A (en) * | 2020-11-09 | 2021-02-23 | 广州南方电力集团科技发展有限公司 | Power failure protection circuit for power distribution and consumption network |
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| JP3724523B2 (en) * | 1996-12-20 | 2005-12-07 | 株式会社安川電機 | Inrush current prevention resistor protection method |
| CN101986491A (en) * | 2010-12-03 | 2011-03-16 | 安徽力高新能源技术有限公司 | Electrical equipment and relay protector |
| CN103378720A (en) * | 2012-04-27 | 2013-10-30 | 珠海格力电器股份有限公司 | Compressor capacity charge control device and method and compressor |
| CN103580458A (en) * | 2012-07-26 | 2014-02-12 | 珠海格力电器股份有限公司 | Method and device for controlling capacitor charging circuit and capacitor charging circuit |
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