CN212275933U - Circuit and equipment for detecting power failure of direct-current power supply - Google Patents
Circuit and equipment for detecting power failure of direct-current power supply Download PDFInfo
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- CN212275933U CN212275933U CN202022197796.8U CN202022197796U CN212275933U CN 212275933 U CN212275933 U CN 212275933U CN 202022197796 U CN202022197796 U CN 202022197796U CN 212275933 U CN212275933 U CN 212275933U
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Abstract
The embodiment of the utility model discloses a direct current power supply outage detection circuit and equipment, wherein one end of a first energy storage module of the circuit is used for connecting a power supply and is connected with one end of a first voltage division module, and the other end of the first energy storage module and the other end of the first voltage division module are grounded; the electric energy input end of the isolation unit is used for connecting a power supply; one end of the second energy storage module is connected with the electric energy output end of the isolation unit and is connected with one end of the second voltage division module, and the other end of the second energy storage module and the other end of the second voltage division module are grounded; a first comparison end of the comparison unit acquires a first voltage of a potential detection end of the first voltage division module; a second comparison end of the comparison unit acquires a second voltage of a potential detection end of the second voltage division module; the comparison result of the first voltage and the second voltage is opposite to the comparison result after the power is turned off before the power is turned off. The technical scheme can detect the disconnection of the direct current power supply with any voltage value, has wider application range and is beneficial to the electricity safety.
Description
Technical Field
The utility model relates to a circuit field especially relates to a DC power supply outage detection circuitry and equipment.
Background
The existing power-off detection technology usually sets a comparison voltage, and when the power voltage (or divided voltage) to be detected is lower than a set value, a signal changes, so as to detect whether the direct-current power supply is powered off. The prior art scheme has the following defects:
1. the comparison voltage is a fixed value, and cannot meet the application environment of wide power supply voltage (for example, a 24V and 48V power supply system cannot be compatible).
2. When the comparison voltage is set high, false triggering is likely to occur, and when the comparison voltage is set low, the detection accuracy is low (the power supply itself fluctuates).
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a dc power supply outage detection circuit and apparatus.
One embodiment of the present invention provides a dc power supply outage detection circuit, which includes a comparison unit, a first discharge unit, a second discharge unit, and an isolation unit;
the first discharging unit comprises a first energy storage module and a first voltage division module, one end of the first energy storage module is used for being connected with a power supply and is connected with one end of the first voltage division module, and the other end of the first energy storage module and the other end of the first voltage division module are grounded;
the electric energy input end of the isolation unit is used for being connected with the power supply;
the second discharging unit comprises a second energy storage module and a second voltage dividing module, one end of the second energy storage module is connected with the electric energy output end of the isolating unit and is connected with one end of the second voltage dividing module, and the other end of the second energy storage module and the other end of the second voltage dividing module are grounded;
a first comparison end of the comparison unit is connected with the potential detection end of the first voltage division module and is used for acquiring a first voltage of the potential detection end of the first voltage division module;
the second comparison end of the comparison unit is connected with the potential detection end of the second voltage division module and is used for acquiring a second voltage of the potential detection end of the second voltage division module;
wherein a comparison result of the first voltage and the second voltage is opposite to a comparison result after the power is turned off before the power is turned off.
In another embodiment of the present invention, the dc power supply power-off detection circuit includes a comparator or a controller.
When the comparison unit is a comparator, the positive end of the comparator is connected with the potential detection end of the first voltage division module, the reverse end of the comparator is connected with the potential detection end of the second voltage division module, and the first energy storage module is also used for being connected with an external load in parallel;
when the power supply supplies power normally, a first voltage of a potential detection end of the first voltage division module is larger than a second voltage of a potential detection end of the second voltage division module;
the first voltage is determined according to the following formula:
U1＝U*RU1/R11，U1representing said first voltage, U representing the voltage of said power supply, RU1Represents a resistance value, R, between the potential detection terminal of the first voltage division module and ground11Representing a total resistance value of the first voltage division module;
the second voltage is determined according to the following equation:
U2＝(U-Ug)*RU2/R22，U2representing said second voltage, RU2Represents a resistance value, R, between the potential detection terminal of the second voltage division module and the ground22Representing the total resistance value of the second voltage division module; u shapegRepresenting a voltage across the isolation unit;
the time ratio of the first discharge time of the first discharge unit to the second discharge time of the second discharge unit is less than 1;
the time ratio is determined according to the following formula:
When the comparison unit is a comparator, the reverse end of the comparator is connected with the potential detection end of the first voltage division module, the forward end of the comparator is connected with the potential detection end of the second voltage division module, and the first energy storage module is further used for being connected with an external load in parallel;
when the power supply supplies power normally, a first voltage of a potential detection end of the first voltage division module is smaller than a second voltage of a potential detection end of the second voltage division module;
the first voltage is determined according to the following formula:
U1＝U*RU1/R11，U1representing said first voltage, U representing the voltage of said power supply, RU1Represents a resistance value, R, between the potential detection terminal of the first voltage division module and ground11Representing a total resistance value of the first voltage division module;
the second voltage is determined according to the following equation:
U2＝(U-Ug)*RU2/R22，U2representing said second voltage, RU2Represents a resistance value, R, between the potential detection terminal of the second voltage division module and the ground22Representing the total resistance value of the second voltage division module; u shapegRepresenting a voltage across the isolation unit;
the time ratio of the first discharge time of the first discharge unit to the second discharge time of the second discharge unit is greater than 1;
the time ratio is determined according to the following formula:
In the above dc power supply outage detection circuit, the isolation unit includes a diode, an anode of the diode is used as an electric energy input end of the isolation unit, and a cathode of the diode is used as an electric energy output end of the isolation unit.
According to the direct-current power supply outage detection circuit, the first energy storage module comprises a first capacitor, the anode of the first capacitor is used for being connected with a power supply, and the cathode of the first capacitor is grounded.
In the dc power supply outage detection circuit, the first voltage division module includes a first resistor and a second resistor, one end of the first resistor is connected to the positive electrode of the first capacitor, the other end of the first resistor serves as a potential detection end of the first voltage division module and is connected to one end of the second resistor, and the other end of the second resistor is grounded.
In the above dc power supply outage detection circuit, the second energy storage module includes a second capacitor, an anode of the second capacitor is connected to the electric energy output end of the isolation unit, and a cathode of the second capacitor is grounded.
In the dc power supply outage detection circuit, the second voltage division module includes a third resistor and a fourth resistor, one end of the third resistor is connected to the anode of the second capacitor, the other end of the third resistor is used as the potential detection end of the second voltage division module and is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded.
A further embodiment of the present invention provides a dc power supply outage detection apparatus, which includes the above-mentioned dc power supply outage detection circuit.
The utility model discloses a DC power supply outage detection circuit includes comparing unit, first discharge unit, second discharge unit and isolation unit, first discharge unit includes first energy storage module and first partial pressure module, the one end of first energy storage module is used for connecting the power, and connect the one end of first partial pressure module, the other end of first energy storage module and the other end ground connection of first partial pressure module; the electric energy input end of the isolation unit is used for being connected with the power supply; the second discharging unit comprises a second energy storage module and a second voltage dividing module, one end of the second energy storage module is connected with the electric energy output end of the isolating unit and is connected with one end of the second voltage dividing module, and the other end of the second energy storage module and the other end of the second voltage dividing module are grounded; a first comparison end of the comparison unit is connected with the potential detection end of the first voltage division module and is used for acquiring a first voltage of the potential detection end of the first voltage division module; the second comparison end of the comparison unit is connected with the potential detection end of the second voltage division module and is used for acquiring a second voltage of the potential detection end of the second voltage division module; wherein a comparison result of the first voltage and the second voltage is opposite to a comparison result after the power is turned off before the power is turned off. The technical scheme can detect the disconnection of the direct current power supply with any voltage value, has wider application range and is beneficial to the electricity safety.
Drawings
In order to illustrate the technical solution of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic functional structural diagram of a dc power supply outage detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a dc power supply outage detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of another dc power outage detection circuit according to an embodiment of the present invention;
fig. 4 shows a schematic circuit structure diagram of another dc power supply outage detection circuit provided by an embodiment of the present invention.
Description of the main element symbols:
1-a comparison unit; 2-a first discharge cell; 3-a second discharge cell; 4-an isolation unit; 21-a first energy storage module; 22-a first voltage divider module; 31-a second energy storage module; 32-a second voltage division module; b1-comparator; c1 — first capacitance; r1 — first resistance; r2 — second resistance; c2 — second capacitance; r3 — third resistance; r4-fourth resistor; m1-controller; d1-diode; rF-an external load.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiment of the present invention, all other embodiments obtained by the person skilled in the art without creative work belong to the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
The utility model discloses a DC power supply outage detection circuitry can detect the disconnection of the DC power supply of arbitrary magnitude of voltage, and the range of application is more extensive, is favorable to the power consumption safety.
Example 1
In the present embodiment, referring to fig. 1, there is shown a dc power supply disconnection detecting circuit including a comparing unit 1, a first discharging unit 2, a second discharging unit 3, and an isolating unit 4.
The first discharge unit 2 comprises a first energy storage module 21 and a first voltage division module 22, wherein one end of the first energy storage module 21 is used for being connected with a power supply and is connected with one end of the first voltage division module 22, and the other end of the first energy storage module 21 and the other end of the first voltage division module 22 are grounded; the electric energy input end of the isolation unit 4 is used for connecting a power supply; the second discharge unit 3 comprises a second energy storage module 31 and a second voltage division module 32, one end of the second energy storage module 31 is connected with the electric energy output end of the isolation unit and is connected with one end of the second voltage division module 32, and the other end of the second energy storage module 31 and the other end of the second voltage division module 32 are grounded; a first comparison end of the comparison unit 1 is connected to a potential detection end of the first voltage division module 22, and is used for acquiring a first voltage of the potential detection end of the first voltage division module 22; the second comparing terminal of the comparing unit 1 is connected to the potential detecting terminal of the second voltage division module 32, and is configured to obtain a second voltage at the potential detecting terminal of the second voltage division module 32, where a comparison result of the first voltage and the second voltage is opposite to a comparison result after the power supply is disconnected before the power supply is disconnected.
Exemplarily, while the first voltage is preset by the first voltage dividing module 22 and the second voltage is preset by the second voltage dividing module 32, the discharge speed of the second discharge unit is preset by the second voltage dividing module 32 according to the comparison result of the preset first voltage and the preset second voltage, so that the comparison result of the first voltage and the second voltage changes when the power supply is turned off, and further the output signal of the power failure detection result output terminal of the comparison unit 1 changes.
It can be understood that the magnitude of the resistance of the second voltage division block 32 can determine the discharge speed of the second discharge unit 3, and the larger the resistance of the second voltage division block 32 is, the smaller the current is, the slower the discharge speed of the second discharge unit 3 is, and the longer the discharge time is. In the case where the discharge time of the first discharge cell 2 is constant, the discharge time of the second discharge cell 3 may be made smaller than the discharge time of the first discharge cell 2 by setting the resistance value of the second voltage division block 32, or the discharge time of the second discharge cell 3 may be made larger than the discharge time of the first discharge cell 2 by setting the resistance value of the second voltage division block 32.
Exemplarily, it may be preset that: when the dc power supply normally supplies power, the first voltage of the potential detection end of the first voltage division module 22 is greater than the second voltage of the potential detection end of the second voltage division module 32, and the discharge speed of the first discharge unit 2 is set to be much greater than the discharge speed of the second discharge unit 3, so that after the power supply is disconnected, the speed of the first voltage reduction is much greater than the speed of the second voltage reduction, and further, after discharging for a period of time, the first voltage will be less than the second voltage, that is, the comparison result of the first voltage and the second voltage changes, and the dc power supply outage can be determined according to a new comparison result.
Exemplarily, it can also preset: when the dc power supply is normally powered, the first voltage at the potential detection end of the first voltage division module 22 is smaller than the second voltage at the potential detection end of the second voltage division module 32, and the first discharge speed of the first discharge unit 2 is set to be much smaller than the second discharge speed of the second discharge unit 3, so that after the power supply end is disconnected from the power supply, the speed of the second voltage reduction is much greater than the speed of the first voltage reduction, and further, after discharging for a period of time, the first voltage will be greater than the second voltage, that is, the comparison result of the first voltage and the second voltage changes, and the dc power supply outage can be determined according to a new comparison result.
The direct current power supply outage detection circuit disclosed in this embodiment includes a comparison unit 1, a first discharge unit 2, a second discharge unit 3, and an isolation unit 4, where the first discharge unit 2 includes a first energy storage module 21 and a first voltage division module 22, one end of the first energy storage module 21 is used for connecting to a power supply and is connected to one end of the first voltage division module 22, and the other end of the first energy storage module 21 and the other end of the first voltage division module 22 are grounded; the electric energy input end of the isolation unit 4 is used for connecting the power supply; the second discharge unit 3 comprises a second energy storage module 31 and a second voltage division module 32, one end of the second energy storage module 31 is connected with the electric energy output end of the isolation unit 4 and is connected with one end of the second voltage division module 32, and the other end of the second energy storage module 31 and the other end of the second voltage division module 32 are grounded; a first comparing end of the comparing unit 1 is connected to a potential detecting end of the first voltage dividing module 22, and is used for acquiring a first voltage of the potential detecting end of the first voltage dividing module 22; a second comparing end of the comparing unit is connected to the potential detecting end of the second voltage dividing module 32, and is used for acquiring a second voltage of the potential detecting end of the second voltage dividing module 32; wherein a comparison result of the first voltage and the second voltage is opposite to a comparison result after the power is turned off before the power is turned off. The technical scheme can detect the disconnection of the direct current power supply with any voltage value, has wider application range and is beneficial to the electricity safety.
Example 2
Further, referring to fig. 2, the comparison unit 1 may be a comparator B1.
The comparator B1 is an electronic component that outputs different voltage results at the output terminal by comparing the magnitudes of the current or voltage at the two input terminals. The voltage comparator B1 can be considered as an operational amplifier with an amplification factor approaching infinity. The voltage comparator B1 is used for comparing the magnitudes of two voltages, for example, the magnitude relation of two input voltages is represented by the high or low level of the output voltage, and when the voltage at the + input terminal is higher than that at the-input terminal, the output of the voltage comparator B1 is at the high level; when the voltage at the "+" input is lower than that at the "-" input, the output of the voltage comparator B1 is low. A chip that can be used as the voltage comparator B1 includes: LM324, LM358, uA741, TL081\ 2\3\4, OP07 and OP27, which can be made into a voltage comparator B1. LM339 and LM393 are professional voltage comparators B1, have fast switching speed and short delay time, and can be used in special voltage comparison occasions.
Exemplarily, as shown in fig. 2, the positive terminal "+" of the comparator B1 is connected to the potential detection terminal of the first voltage division block 22, the negative terminal "-" of the comparator B1 is connected to the potential detection terminal of the second voltage division block 32, and when the voltage drop generated by the isolation unit 4 is ignored, a first ratio of the resistance between the potential detection terminal of the first voltage division block 22 and the ground to the total resistance of the first voltage division block 22 is greater than a second ratio of the resistance between the potential detection terminal of the second voltage division block 32 and the ground to the total resistance of the second voltage division block 32, so that the first voltage at the potential detection terminal of the first voltage division block 22 is greater than the second voltage at the potential detection terminal of the second voltage division block 32; the discharge time of the first discharge unit 2 is less than the discharge time of the second discharge unit 3, that is, the discharge speed of the first discharge unit 2 is greater than the discharge speed of the second discharge unit 3, and after the power is turned off for a period of time, the first voltage is less than the second voltage. It is understood that one end of the first energy storage module 21 is used for connecting one end of an external load, and the other end of the external load is grounded. The external load is external electric equipment.
Exemplarily, as shown in fig. 3, the reverse terminal of the comparator B1 is connected to the potential detection terminal of the first voltage division block 22, the forward terminal of the comparator B1 is connected to the potential detection terminal of the second voltage division block 32, and when the voltage drop generated by the isolation unit 4 is ignored, a first ratio of the resistance value between the potential detection terminal of the first voltage division block 22 and the ground and the total resistance value of the first voltage division block 22 is smaller than a second ratio of the resistance value between the potential detection terminal of the second voltage division block 32 and the ground and the total resistance value of the second voltage division block 32, so that the first voltage at the potential detection terminal of the first voltage division block 22 is smaller than the second voltage at the potential detection terminal of the second voltage division block 32; the discharge time of the first discharge unit 2 is made to be longer than the discharge time of the second discharge unit 3, that is, the discharge speed of the first discharge unit 2 is made to be shorter than the discharge speed of the second discharge unit 3, and after the power supply is turned off for a period of time, the first voltage is made to be higher than the second voltage. It is understood that one end of the first energy storage module 21 is used for connecting one end of an external load, and the other end of the external load is grounded. The external load is external electric equipment.
Further, the first discharge time is determined according to the following formula:
Further, the second discharge time is determined according to the following formula:
A time ratio of a first discharge time of the first discharge cell to a second discharge time of the second discharge cell
k represents the time ratio, RfRepresents the equivalent resistance value, R, of the external load11Represents the total resistance value, C, of the first voltage dividing module1Represents the equivalent capacitance, R, of the first energy storage module22Represents the total resistance value, C, of the second voltage dividing module2Representing the equivalent capacitance of the second energy storage module. Wherein, the external load RFCan be understood as the equivalent resistance R of the external load of the electric equipment with the external connection of the positive and negative ends of the power supplyfThe equivalent resistance of the external electric equipment at the two ends of the anode and the cathode of the power supply can be understood.
It can be understood that a time ratio of a first discharge time of the first discharge cell to a second discharge time of the second discharge cell is greater than 1, and the first discharge time of the first discharge cell is greater than the second discharge time of the second discharge cell. The time ratio of the first discharge time of the first discharge unit to the second discharge time of the second discharge unit is less than 1, and the first discharge time of the first discharge unit is less than the second discharge time of the second discharge unit.
Further, the first energy storage module 21 of the first discharge unit 2 includes a first capacitor C1, a positive electrode of the first capacitor C1 is used for connecting a power supply, and a negative electrode of the first capacitor C1 is grounded. The first capacitor C1 can be understood as the sum of equivalent stored energy at the positive and negative ends of the power supply.
Further, the first voltage dividing module 22 of the first discharge unit 2 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the positive electrode of the first capacitor C1, the other end of the first resistor R1 is used as a potential detection end of the first voltage dividing module 22 and is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded. The voltage at two ends of the first capacitor C1 is divided by the first resistor R1 and the second resistor R2, so that the voltage division accuracy is high, and the adjustment is flexible.
Exemplarily, the first voltage of the potential detection terminal of the first energy storage module 21
Vin1Representing the input voltage (as shown in FIG. 2), R1Representing the resistance of the first resistor R1, R2Representing the resistance of the second resistor R2.
Further, the second energy storage module 31 of the second discharge unit 3 includes a second capacitor C2, the positive electrode of the second capacitor C2 is connected to the power output terminal of the isolation unit 4, and the negative electrode of the second capacitor C2 is grounded.
Further, the second voltage dividing module 32 of the second discharge unit 3 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the anode of the second capacitor C2, the other end of the third resistor R3 is used as a potential detection end of the second voltage dividing module 32 and is connected to one end of the fourth resistor R4, and the other end of the fourth resistor is grounded. The voltage at two ends of the second capacitor C2 is divided by the third resistor R3 and the fourth resistor R4, so that the voltage division precision is high, and the adjustment is flexible.
Exemplarily, the second voltage of the potential detecting terminal of the second voltage division module 32
When neglecting the voltage across the isolation unit 4, V is shown in FIG. 2in2Is close to the input voltage Vin1，R3Representing the resistance of the third resistor R3, R4Indicating the resistance of the fourth resistor R4.
It can be understood that
Is greater than
First voltage V1Greater than the second voltage V2In a
Is less than
First voltage V1Is less than the second voltage V2。
Exemplarily, the equivalent resistance of the external load is denoted as RfThe total discharge resistance of the first voltage dividing module 22 and the external load connected in parallel therewithThen is
Ratio of time
Should be less than 1 so that the discharge time of the first discharge cell 2 is less than the discharge time of the second discharge cell 3.
Further, it should be understood that the discharge time t ═ R ═ C of the discharge circuit can be controlled by adjusting the resistance without changing the capacitance. Under the condition that the resistance is unchanged, the discharge time can be controlled by setting the capacitor. In addition, the discharge time can be controlled by the capacitor and the resistor at the same time. And are not limited herein.
Further, the isolation unit 4 includes a diode D1, an anode of the diode D1 is used as a power input terminal of the isolation unit 4 for connecting a power supply terminal, and a cathode of the diode D1 is used as a power output terminal of the isolation unit 4 for connecting a charging terminal of the second discharging unit 3. The diode D1 is used for isolation, and an inner voltage and an outer voltage are formed when the direct current power supply is powered off, so that the first discharge unit 2 and the second discharge unit 3 are not interfered with each other.
Example 3
In this embodiment, referring to fig. 4, the comparing unit 1 may be a controller M1, and the controller M1 is configured to monitor the first voltage and the second voltage in real time, and update the output signal of the power-off detection result output terminal when the comparison result between the first voltage and the second voltage changes.
Exemplarily, a first pin of the controller M1 is used as a first comparison terminal for monitoring the first voltage in real time, a second pin of the controller M1 is used as a second comparison terminal for monitoring the second voltage in real time, a third pin of the controller M1 is used as a power-off detection result output terminal, and when a comparison result of the first voltage and the second voltage changes, an output signal of the power-off detection result output terminal is updated.
It will be appreciated that the controller M1 has an analog-to-digital conversion module built therein that can convert a received analog signal into a digital signal. If the controller M1 does not have a built-in analog-to-digital conversion module, the first voltage and the second voltage may be converted into digital signals by an analog-to-digital conversion chip and then sent to corresponding pins of the controller M1.
It can be understood that the embodiment of the utility model provides a direct current power supply outage detection equipment is related to, and this equipment includes the utility model discloses direct current power supply outage detection circuitry.
Exemplary dc power outage detection devices include gate devices and other powered devices. For example, the gate device may determine that the dc power is off by using the dc power outage detection circuit, and further, the gate device may automatically perform a gate opening operation by using the standby power, so as to prevent the gate from being closed when the power is off.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention.
Claims (10)
1. A DC power supply power-off detection circuit is characterized in that the circuit comprises a comparison unit, a first discharge unit, a second discharge unit and an isolation unit,
the first discharging unit comprises a first energy storage module and a first voltage division module, one end of the first energy storage module is used for being connected with a power supply and is connected with one end of the first voltage division module, and the other end of the first energy storage module and the other end of the first voltage division module are grounded;
the electric energy input end of the isolation unit is used for being connected with the power supply;
the second discharging unit comprises a second energy storage module and a second voltage dividing module, one end of the second energy storage module is connected with the electric energy output end of the isolating unit and is connected with one end of the second voltage dividing module, and the other end of the second energy storage module and the other end of the second voltage dividing module are grounded;
a first comparison end of the comparison unit is connected with the potential detection end of the first voltage division module and is used for acquiring a first voltage of the potential detection end of the first voltage division module;
the second comparison end of the comparison unit is connected with the potential detection end of the second voltage division module and is used for acquiring a second voltage of the potential detection end of the second voltage division module;
wherein a comparison result of the first voltage and the second voltage is opposite to a comparison result after the power is turned off before the power is turned off.
2. The dc power supply disconnection detecting circuit according to claim 1, wherein the comparing unit is a comparator or a controller.
3. The direct current power supply outage detection circuit according to claim 2, wherein when the comparison unit is a comparator, a forward end of the comparator is connected to the potential detection end of the first voltage division module, a reverse end of the comparator is connected to the potential detection end of the second voltage division module, and the first energy storage module is further configured to be connected in parallel with an external load;
when the power supply supplies power normally, a first voltage of the potential detection end of the first voltage division module is larger than a second voltage of the potential detection end of the second voltage division module;
the first voltage is determined according to the following formula:
U1＝U*RU1/R11，U1representing said first voltage, U representing the voltage of said power supply, RU1Represents a resistance value, R, between the potential detection terminal of the first voltage division module and ground11Representing a total resistance value of the first voltage division module;
the second voltage is determined according to the following equation:
U2＝(U-Ug)*RU2/R22，U2representing said second voltage, RU2Represents a resistance value, R, between the potential detection terminal of the second voltage division module and the ground22Representing the total resistance value of the second voltage division module; u shapegRepresenting a voltage across the isolation unit;
the time ratio of the first discharge time of the first discharge unit to the second discharge time of the second discharge unit is less than 1;
the time ratio is determined according to the following formula:
4. The direct current power supply outage detection circuit according to claim 2, wherein when the comparison unit is a comparator, a reverse end of the comparator is connected to a potential detection end of the first voltage division module, a forward end of the comparator is connected to a potential detection end of the second voltage division module, and the first energy storage module is further configured to be connected in parallel with an external load;
when the power supply supplies power normally, a first voltage of the potential detection end of the first voltage division module is smaller than a second voltage of the potential detection end of the second voltage division module;
the first voltage is determined according to the following formula:
U1＝U*RU1/R11，U1representing said first voltage, U representing the voltage of said power supply, RU1Represents a resistance value, R, between the potential detection terminal of the first voltage division module and ground11Representing a total resistance value of the first voltage division module;
the second voltage is determined according to the following equation:
U2＝(U-Ug)*RU2/R22，U2representing said second voltage, RU2Represents a resistance value, R, between the potential detection terminal of the second voltage division module and the ground22Representing the total resistance value of the second voltage division module; u shapegRepresents the voltage across the isolation cell:
the time ratio of the first discharge time of the first discharge unit to the second discharge time of the second discharge unit is greater than 1;
the time ratio is determined according to the following formula:
5. The dc power supply outage detection circuit according to claim 1, wherein the isolation unit comprises a diode, an anode of the diode serving as a power input terminal of the isolation unit, and a cathode of the diode serving as a power output terminal of the isolation unit.
6. The dc power outage detection circuit of claim 1, wherein the first energy storage module comprises a first capacitor, an anode of the first capacitor is configured to be connected to a power source, and a cathode of the first capacitor is connected to ground.
7. The dc power supply disconnection detecting circuit according to claim 6, wherein the first voltage dividing module includes a first resistor and a second resistor, one end of the first resistor is connected to the positive electrode of the first capacitor, the other end of the first resistor is used as a potential detecting end of the first voltage dividing module and is connected to one end of the second resistor, and the other end of the second resistor is grounded.
8. The power failure detection circuit for the direct current power supply according to claim 1, wherein the second energy storage module comprises a second capacitor, an anode of the second capacitor is connected to the power output end of the isolation unit, and a cathode of the second capacitor is grounded.
9. The dc power supply disconnection detecting circuit according to claim 8, wherein the second voltage dividing module includes a third resistor and a fourth resistor, one end of the third resistor is connected to the positive electrode of the second capacitor, the other end of the third resistor is used as a potential detecting end of the second voltage dividing module and is connected to one end of the fourth resistor, and the other end of the fourth resistor is grounded.
10. A dc power outage detection apparatus, characterized in that the apparatus comprises a dc power outage detection circuit according to any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112068034A (en) * | 2020-09-29 | 2020-12-11 | 深圳市嘉昱机电有限公司 | Circuit and equipment for detecting power failure of direct-current power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112068034A (en) * | 2020-09-29 | 2020-12-11 | 深圳市嘉昱机电有限公司 | Circuit and equipment for detecting power failure of direct-current power supply |
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