CN112180283A - Fire alarm system and uninterrupted power source - Google Patents
Fire alarm system and uninterrupted power source Download PDFInfo
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- CN112180283A CN112180283A CN202010914585.3A CN202010914585A CN112180283A CN 112180283 A CN112180283 A CN 112180283A CN 202010914585 A CN202010914585 A CN 202010914585A CN 112180283 A CN112180283 A CN 112180283A
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- 238000001514 detection method Methods 0.000 claims abstract description 61
- 238000005070 sampling Methods 0.000 claims description 183
- 230000008054 signal transmission Effects 0.000 claims description 84
- 239000003990 capacitor Substances 0.000 claims description 23
- 239000004065 semiconductor Substances 0.000 description 11
- 230000002159 abnormal effect Effects 0.000 description 7
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention provides a fire alarm system and an uninterruptible power supply, wherein the fire alarm system comprises a detection unit and a main control unit; the detection unit is used for acquiring a working state signal of the preset detection point, and the working state signal comprises a working temperature and at least one of the following signals: operating voltage and operating current; the main control unit is connected with the detection unit and judges whether the uninterrupted power supply has fire hazard according to the working state signal of the preset detection point acquired by the detection unit. According to the invention, the preset detection points in the uninterruptible power supply are detected, whether fire hazard exists in the uninterruptible power supply is judged according to the working state signals of the preset detection points obtained through detection, and the multipoint multi-strip combination judgment is carried out simultaneously, so that the accuracy and timeliness of fire alarm are greatly improved, no additional detection device is required to be added, and the cost is relatively low.
Description
Technical Field
The invention relates to the field of uninterruptible power supplies, in particular to a fire alarm system and an uninterruptible power supply.
Background
An Uninterruptible Power Supply (UPS) is a backup protection power supply for power supply and distribution equipment which is widely used at present. The uninterrupted power supply rectifies the commercial power and then charges the commercial power to the storage battery, and when the commercial power is abnormal, the commercial power is switched to the storage battery for power supply, and is inverted to the load for use. When the commercial power input is normal, the uninterrupted power supply is used as an alternating current commercial power voltage stabilizer to stabilize the commercial power and supply the stabilized commercial power to a load for use, and meanwhile, the uninterrupted power supply charges a built-in battery.
In the existing uninterrupted power supply, the application of a high-frequency module machine is more and more extensive, the power density of the high-frequency module machine is high, the layout of devices is compact, after a semiconductor device is abnormally damaged, secondary faults can be caused by electric arc discharge and conductive debris splashed around, and fire disasters can be caused in serious cases.
At present, if abnormal conditions such as fire disaster occur, detection is usually carried out through other fire fighting equipment in a building, and fire extinguishment is carried out through the fire fighting equipment in the building. This may result in delaying the optimal time for fire suppression due to failure to detect the initial abnormal fire condition in time.
Disclosure of Invention
The present invention provides a fire alarm system and an uninterruptible power supply, aiming at the problem that the uninterruptible power supply delays the time for fire extinguishing because the initial fire cannot be detected in time.
The technical scheme for solving the technical problems is that the invention provides a fire alarm system, which is applied to an uninterruptible power supply, wherein the uninterruptible power supply comprises a rectifier, an inverter and a direct-current bus capacitor, and the fire alarm system comprises a detection unit and a main control unit; the detection unit is used for acquiring a working state signal of the preset detection point, and the working state signal comprises a working temperature and at least one of the following signals: operating voltage and operating current; the main control unit is connected with the detection unit and judges whether the uninterrupted power supply has fire hazard according to the working state signal of the preset detection point acquired by the detection unit.
Preferably, the preset detection point includes a rectifier, the detection unit includes a first voltage sampling circuit, a first current sampling circuit, a first temperature sampling circuit, and a first signal transmission circuit, and obtains a voltage of a voltage sampling element in the rectifier of the uninterruptible power supply through the first voltage sampling circuit, obtains a current of the current sampling element in the rectifier of the uninterruptible power supply through the first current sampling circuit, and obtains a temperature of the temperature sampling element in the rectifier of the uninterruptible power supply through the first temperature sampling circuit;
the first signal transmission circuit is respectively connected with the first voltage sampling circuit, the first current sampling circuit, the first temperature sampling circuit and the main control unit, and respectively sends the sampling voltage of the first voltage sampling circuit, the sampling current of the first current sampling circuit and the sampling temperature of the first temperature sampling circuit to the main control unit.
Preferably, the main control unit comprises a first alarm unit and a first storage unit for storing a first temperature threshold, a first voltage threshold and a first current threshold;
the first alarm unit outputs a first fire alarm signal when the sampling temperature from the first signal transmission circuit reaches the first temperature threshold value and the sampling voltage from the first signal transmission circuit reaches the first voltage threshold value;
or, the first alarm unit outputs a first fire alarm signal when the sampling temperature from the first signal transmission circuit reaches the first temperature threshold value and the sampling current from the first signal transmission circuit reaches the first current threshold value.
Preferably, the first storage unit stores a second temperature threshold, a second voltage threshold and a second current threshold, the second temperature threshold is smaller than the first temperature threshold, the second voltage threshold is smaller than the first voltage threshold, and the second current threshold is smaller than the first current threshold;
the first alarm unit outputs a first fire pre-alarm signal when the sampling temperature from the first signal transmission circuit is greater than the second temperature threshold and less than a first temperature threshold, and the sampling voltage from the first signal transmission circuit is greater than the second voltage threshold and less than a first voltage threshold;
or, the first alarm unit outputs a first fire pre-alarm signal when the sampling temperature from the first signal transmission circuit is greater than the second temperature threshold and less than a first temperature threshold, and the sampling current from the first signal transmission circuit is greater than the second current threshold and less than a first current threshold.
Preferably, the preset detection point includes an inverter, the detection unit includes a second voltage sampling circuit, a second current sampling circuit, a second temperature sampling circuit, and a second signal transmission circuit, and obtains a voltage of a voltage sampling element in the inverter of the uninterruptible power supply through the second voltage sampling circuit, a current of a current sampling element in the inverter of the uninterruptible power supply through the second current sampling circuit, and a temperature of the temperature sampling element in the inverter of the uninterruptible power supply through the second temperature sampling circuit;
and the second signal transmission circuit is respectively connected with the second voltage sampling circuit, the second current sampling circuit, the second temperature sampling circuit and the main control unit, and sends sampling signals of the second voltage sampling circuit, the second current sampling circuit and the second temperature sampling circuit to the main control unit.
Preferably, the main control unit comprises a second alarm unit and a second storage unit for storing a third temperature threshold, a third voltage threshold and a third current threshold;
the second alarm unit outputs a second fire alarm signal when the sampling temperature from the second signal transmission circuit is greater than the third temperature threshold value and the sampling voltage from the second signal transmission circuit is greater than the third voltage threshold value;
or, the second alarm unit outputs a second fire alarm signal when the sampled temperature from the second signal transmission circuit reaches the third temperature threshold and the sampled current from the second signal transmission circuit reaches the third current threshold.
Preferably, the second storage unit stores a fourth temperature threshold, a fourth voltage threshold and a fourth current threshold, the fourth temperature threshold is smaller than the third temperature threshold, the fourth voltage threshold is smaller than the third voltage threshold, and the fourth current threshold is smaller than the third current threshold;
the second alarm unit outputs a second fire pre-alarm signal when the sampling temperature from the second signal transmission circuit is greater than the fourth temperature threshold and less than a third temperature threshold, and the sampling voltage from the second signal transmission circuit is greater than the fourth voltage threshold and less than a third voltage threshold;
or, the second alarm unit outputs a second fire alarm signal when the sampling temperature from the second signal transmission circuit is greater than the fourth temperature threshold and less than a third temperature threshold, and the sampling current from the second signal transmission circuit is greater than the fourth current threshold and less than a third temperature threshold.
Preferably, the preset detection point includes a dc bus capacitor, the detection unit includes a third voltage sampling circuit, a third temperature sampling circuit and a third signal transmission circuit, and obtains the voltage of a voltage sampling element on the dc bus of the ups through the third voltage sampling circuit and obtains the temperature of a temperature sampling element on the dc bus capacitor of the ups through the third temperature sampling circuit;
and the third signal transmission circuit is respectively connected with the third voltage sampling circuit, the third temperature sampling circuit and the main control unit and sends sampling signals of the third voltage sampling circuit and the third temperature sampling circuit to the main control unit.
Preferably, the main control unit comprises a third alarm unit and a third storage unit for storing a voltage amplitude drop threshold, a voltage drop change rate threshold, a fifth voltage threshold and a fifth temperature threshold;
the third alarm unit outputs a third fire alarm signal when the sampling temperature from the third signal transmission circuit reaches the fifth temperature threshold value and the sampling voltage from the third signal transmission circuit reaches the fifth voltage threshold value;
or the third alarm unit outputs a third fire alarm signal when the sampling temperature from the third signal transmission circuit is greater than the fifth temperature threshold, the sampling voltage from the third signal transmission circuit exceeds the voltage amplitude drop threshold, and the voltage drop change rate of the sampling voltage exceeds the voltage drop change rate threshold.
The embodiment of the invention also provides an uninterruptible power supply which comprises a shell, and a rectifier, an inverter and a direct-current bus capacitor which are positioned in the shell, and the uninterruptible power supply also comprises the fire alarm system which is positioned in the shell.
The fire alarm system and the uninterrupted power supply have the following beneficial effects: whether fire hazard exists inside the uninterruptible power supply is judged according to working state signals of the preset detection points obtained by detection, accuracy and timeliness of fire alarm are greatly improved, an additional detection device is not required to be added, and cost is relatively low.
Drawings
FIG. 1 is a schematic diagram of a fire alerting system provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a detection unit and a main control unit in the fire alarm system according to the embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a detection unit and a main control unit in the fire alarm system according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a detection unit and a main control unit in a fire alarm system according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic diagram of a fire alarm system according to an embodiment of the present invention, which is applicable to an uninterruptible power supply and alarms when a fire occurs in the uninterruptible power supply. The uninterruptible power supply includes a rectifier 21, an inverter 22, and a dc bus capacitor 23, wherein the rectifier 21 is connected to the inverter 22 via a dc bus, and the dc bus capacitor 23 is connected to the dc bus. The fire alarm system of the present embodiment includes a detection unit 11 and a main control unit 12, and the detection unit 11 and the main control unit 12 may be formed by combining electronic components, respectively.
The detecting unit 11 is used for acquiring a working state signal of a preset detecting point. The preset detection point may be any one or more of the rectifier 21, the inverter 22 and the dc bus capacitor 23, and the operating state signal includes an operating temperature and at least one of the following: an operating voltage and an operating current. The main control unit 12 is connected to the detection unit 11, and determines whether the uninterruptible power supply has a fire hazard according to the working state signal of the preset detection point acquired by the detection unit 11. In particular, the main control unit 12 may be connected to a control device of the ups, and output a signal to the control device of the ups to stop the entire or a part of the ups when it is determined that the ups has a fire hazard. In addition, the main control unit 12 can be connected to and put into operation external fire fighting equipment.
According to the fire alarm system, the preset detection points in the uninterruptible power supply are detected, whether fire hazard exists in the uninterruptible power supply is judged according to the working state signals of the preset detection points obtained through detection, the accuracy and timeliness of fire alarm are greatly improved, extra detection devices (such as smoke detectors, infrared flame detectors, special gas detectors and the like) are not required to be added, and the cost is relatively low.
Referring to fig. 2, in an embodiment of the present invention, the predetermined detection point in the ups includes a rectifier 21, in which case, the detection unit 11 includes a first voltage sampling circuit 1101, a first current sampling circuit 1102, a first temperature sampling circuit 1103 and a first signal transmission circuit 1104, and the detection unit 11 is connected to a voltage sampling element (e.g., a voltage sampling resistor) in the rectifier 21 of the ups through the first voltage sampling circuit 1101 and obtains a corresponding voltage (i.e., an operating voltage of the rectifier 21), connected to a current sampling element (e.g., a hall element or a current sampling resistor) in the rectifier 21 of the ups through the first current sampling circuit 1102 and obtains a corresponding current (i.e., an operating current of the rectifier 21), and connected to a temperature sampling element (e.g., a thermistor, may be attached to the surface of the semiconductor switch in the rectifier 21) and a corresponding temperature (i.e., the operating temperature of the rectifier 21) is obtained.
The first signal transmission circuit 1104 is connected to the first voltage sampling circuit 1101, the first current sampling circuit 1102, the first temperature sampling circuit 1103, and the main control unit 12, and transmits the sampling voltage of the first voltage sampling circuit 1101, the sampling current of the first current sampling circuit 1102, and the sampling temperature of the first temperature sampling circuit 1103 to the main control unit 12. Specifically, the first signal transmission circuit 1104 may be a wire, or include a filter element and the like.
Accordingly, the main control unit 12 includes a first alarm unit 121 and a first storage unit 122 for storing a first temperature threshold, a first voltage threshold, and a first current threshold, which may be set according to the working environment, power, and the like of the ups. For example, the first temperature threshold may be set to the highest withstanding temperature of the semiconductor devices in the rectifier 21 (beyond which the devices may overheat and catch fire); the first voltage threshold may be set to an input voltage operating range of the ups (within which the rectifier may operate properly); the first current threshold may be set above 150% of the rated current (this current is an abnormal current beyond which it may cause the device to overheat and ignite).
The first alarm unit 121 outputs a first fire alarm signal when the sampling temperature from the first signal transmission circuit 1104 reaches a first temperature threshold and the sampling voltage from the first signal transmission circuit reaches a first voltage threshold; alternatively, the first alarm unit 121 outputs the first fire alarm signal when the sampled temperature from the first signal transmission circuit 1104 reaches the first temperature threshold value and the sampled current from the first signal transmission circuit 1104 reaches the first current threshold value. The first fire alarm signal is used for prompting that a fire disaster occurs in the uninterruptible power supply.
In addition, the first storage unit 122 may further store a second temperature threshold, a second voltage threshold and a second current threshold, where the second temperature threshold is smaller than the first temperature threshold, the second voltage threshold is smaller than the first voltage threshold, and the second current threshold is smaller than the first current threshold. For example, the second temperature threshold may be set to a junction temperature allowable range of the semiconductor devices in the rectifier 21 (within the temperature range, an allowable temperature is included, and beyond the temperature range, an abnormal temperature is included, and device damage may be caused); the second voltage threshold may be set to the input voltage operating range of the ups (within which the rectifier may operate properly); the second current threshold may be set at 125% to 150% of the rated current (the current being the maximum of the operating current in the range that the semiconductor devices in the rectifier 21 are allowed to withstand the current).
Accordingly, the first alarm unit 121 outputs a first fire pre-alarm signal when the sampled temperature from the first signal transmission circuit 1104 is greater than the second temperature threshold and less than the first temperature threshold, and the sampled voltage from the first signal transmission circuit 1104 is greater than the second voltage threshold and less than the first voltage threshold; alternatively, the first alarm unit 121 outputs the first fire pre-alarm signal when the sampled temperature from the first signal transmission circuit 1104 is greater than the second temperature threshold and less than the first temperature threshold, and the sampled current from the first signal transmission circuit 1104 is greater than the second current threshold and less than the first current threshold. The first fire pre-alarm signal can be used for prompting that a large fire risk exists in the uninterruptible power supply. The first fire pre-alarm signal may trigger system protection (e.g., reduce the output power of the ups, etc.), and the temperature of the rectifier may drop rapidly under normal conditions.
As shown in fig. 3, in an embodiment of the present invention, the predetermined detection point in the ups includes the inverter 22, in this case, the detection unit 11 includes a second voltage sampling circuit 1105, a second current sampling circuit 1106, a second temperature sampling circuit 1107 and a second signal transmission circuit 1108, and the detection unit 11 is connected to a voltage sampling element (e.g., a voltage sampling resistor) in the inverter 22 of the ups through the second voltage sampling circuit 1105 and obtains a corresponding voltage (i.e., an operating voltage of the inverter 22), connected to a current sampling element (e.g., a hall element or a current sampling resistor) in the inverter 22 of the ups through the second current sampling circuit and obtains a corresponding current (i.e., an operating current of the inverter 22), and connected to a temperature sampling element (e.g., a thermistor, may be attached to the surface of the semiconductor switch in the inverter 22) and a corresponding temperature (i.e., the operating temperature of the inverter 22) is obtained.
The second signal transmission circuit 1108 is connected to the second voltage sampling circuit 1105, the second current sampling circuit 1106, the second temperature sampling circuit 1107, and the main control unit 12, and transmits sampling signals of the second voltage sampling circuit 1105, the second current sampling circuit 1106, and the second temperature sampling circuit 1107 to the main control unit 12. Specifically, the second signal transmission circuit 1108 may be a wire, or include a filter element and the like.
Accordingly, the main control unit 12 comprises a second alarm unit 123 and a second storage unit 124 for storing a third temperature threshold, a third voltage threshold, a third current threshold. The third temperature threshold, the third voltage threshold, and the third current threshold may be set according to a working environment, power, and the like of the uninterruptible power supply. For example, the above-described third temperature threshold may be set to the maximum withstand temperature of the semiconductor devices in the inverter 22 (beyond which the semiconductor devices in the inverter 22 will overheat and catch fire); the third voltage threshold may be set to an output voltage operating range of the ups (within which the inverter is in operation); the third current threshold may be set above 250% of the rated current (which is an abnormal current beyond which overheating and ignition of semiconductor devices in the inverter 22 may occur).
The second alarm unit 123 outputs a second fire alarm signal when the sampled temperature from the second signal transmission circuit 1108 reaches a third temperature threshold and the sampled voltage from the second signal transmission circuit 1108 reaches a third voltage threshold; alternatively, the second alarm unit 123 outputs the second fire alarm signal when the sampled temperature from the second signal transmission circuit 1108 reaches the third temperature threshold and the sampled current from the second signal transmission circuit 1108 reaches the third current threshold. The second fire pre-alarm signal may be used to indicate that a fire has occurred within the ups.
In addition, the second storage unit 124 may further store a fourth temperature threshold, a fourth voltage threshold and a fourth current threshold, wherein the fourth temperature threshold is smaller than the third temperature threshold, the fourth voltage threshold is smaller than the third voltage threshold, and the fourth current threshold is smaller than the third current threshold. For example, the fourth temperature threshold may be set to a junction temperature allowable range of the semiconductor devices in the inverter 22 (a temperature exceeding the fourth temperature threshold is an abnormal temperature, and may cause device damage); the fourth voltage threshold may be set to an output voltage operating range of the ups (within which the inverter may operate normally); the fourth current threshold may be 150% to 200% of the rated current (the current being the maximum value of the inverter operating current, in which range the semiconductor devices in the inverter 22 are allowed to withstand the current).
Accordingly, the second alarm unit 123 outputs a second fire pre-alarm signal when the sampled temperature from the second signal transmission circuit 1108 reaches the fourth temperature threshold and is less than the third temperature threshold, and the sampled voltage from the second signal transmission circuit 1108 reaches the third voltage threshold and is less than the third voltage threshold; alternatively, the second alarm unit 123 outputs the second fire pre-alarm signal when the sampled temperature from the second signal transmission circuit 1108 reaches the fourth temperature threshold and is less than the third temperature threshold, and the sampled current from the second signal transmission circuit 1108 reaches the fourth current threshold and is less than the third current threshold. The second fire pre-alarm signal can be used for prompting that a larger fire risk exists in the uninterruptible power supply. The second fire pre-alarm signal may trigger system protection (e.g., reduce the output power of the ups, etc.), and the temperature of the inverter may drop rapidly under normal conditions.
In another embodiment of the present invention, as shown in fig. 4, the predetermined detection point in the ups includes a dc bus capacitor 23, in this case, the detection unit 11 includes a third voltage sampling circuit 1109, a third temperature sampling circuit 1110 and a third signal transmission circuit 1111, and the detection unit 11 is connected to a voltage sampling element (e.g., a voltage sampling resistor) on the dc bus of the ups through the third voltage sampling circuit 1109 and obtains a corresponding voltage (i.e., a terminal voltage of the dc bus capacitor 23), and is connected to a temperature sampling element (e.g., a thermistor, which may be attached to a surface of the dc bus capacitor 23) on the dc bus capacitor 23 of the ups through the third temperature sampling circuit 1110 and obtains a corresponding temperature.
The third signal transmission circuit 1111 is connected to the third voltage sampling circuit 1109, the third temperature sampling circuit 1110, and the main control unit 12, and transmits the sampling signals of the third voltage sampling circuit 1109 and the third temperature sampling circuit 1110 to the main control unit 12.
Accordingly, the main control unit 12 comprises a third alarm unit 125 and a third storage unit 126 for storing a voltage amplitude droop threshold, a voltage droop rate-of-change threshold, a fifth voltage threshold, a fifth temperature threshold. The voltage amplitude drop threshold, the voltage drop change rate threshold, the fifth voltage threshold and the fifth temperature threshold can be set according to the working environment, power and the like of the uninterruptible power supply. For example, the fifth temperature threshold may be set to the allowable range of the dc bus capacitor 23, i.e., the maximum withstand temperature of 125% of the electrolytic capacitor (exceeding the temperature range will cause device damage); the first voltage drop rate-of-change threshold DV/DT may be derived from the following calculation equation (1):
I＝C*DV/DT (1)
wherein, I is 150% of rated current, C is the capacitance value of the dc bus capacitor 23, and the voltage drop change rate threshold DV/DT is calculated as I/C, within which the dc bus capacitor 23 is in normal discharge;
the fifth voltage threshold may be set to 75% -110% of the rated voltage of the ups dc voltage operating range within which the rectifier can operate normally.
The third alarm unit 125 outputs a third fire alarm signal when the sampled temperature from the third signal transmission circuit 1111 reaches the fifth temperature threshold value and the sampled voltage from the third signal transmission circuit 1111 reaches the fifth voltage threshold value; alternatively, the third alarm unit 125 outputs a third fire alarm signal when the sampled temperature from the third signal transmission circuit 1111 reaches the fifth temperature threshold, the sampled voltage from the third signal transmission circuit 1111 exceeds the voltage amplitude drop threshold, and the voltage drop change rate of the sampled voltage exceeds the voltage drop change rate threshold. The third fire pre-alarm signal may be used to indicate that a fire has occurred within the ups.
In addition, the third alarm unit 125 outputs an alarm signal indicating that the dc bus capacitor has an overvoltage fault when the sampling temperature from the third signal transmission circuit 1111 does not reach the fifth temperature threshold value but the sampling voltage from the third signal transmission circuit 1111 reaches the fifth voltage threshold value.
And when the sampling temperature from the third signal transmission circuit 1111 does not reach the fifth temperature threshold, but the sampling voltage from the third signal transmission circuit 1111 exceeds the voltage amplitude drop threshold and the voltage drop change rate of the sampling voltage exceeds the voltage drop change rate threshold, the third alarm unit 125 outputs an alarm signal indicating that the short-circuit fault exists in the dc bus capacitor.
In an embodiment of the present invention, the detecting unit 11 and the main control unit 12 may be integrated into the same printed circuit board, for example, may be integrated into a main control board of an uninterruptible power supply. Of course, in practical applications, the detecting unit 11 may also be located on a separate printed circuit board, for example, including three boards for detecting the operating status signals of the rectifier 21, the inverter 22 and the dc bus capacitor 23.
The embodiment of the invention also provides an uninterruptible power supply, which comprises a shell, and a rectifier, an inverter and a direct-current bus capacitor which are positioned in the shell, and the uninterruptible power supply also comprises the fire alarm system which is positioned in the shell (namely the detection unit and the main control unit are positioned in the shell).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A fire alarm system is applied to an uninterruptible power supply, wherein the uninterruptible power supply comprises a rectifier, an inverter and a direct current bus capacitor, and the fire alarm system is characterized by comprising a detection unit and a main control unit; the detection unit is used for acquiring a working state signal of a preset detection point, and the working state signal comprises a working temperature and at least one of the following signals: operating voltage and operating current; the main control unit is connected with the detection unit and judges whether the uninterrupted power supply has fire hazard according to the working state signal of the preset detection point acquired by the detection unit.
2. The fire alarm system according to claim 1, wherein the predetermined detection point includes a rectifier, the detection unit includes a first voltage sampling circuit, a first current sampling circuit, a first temperature sampling circuit, and a first signal transmission circuit, and the voltage of a voltage sampling element in the rectifier of the ups is obtained through the first voltage sampling circuit, the current of a current sampling element in the rectifier of the ups is obtained through the first current sampling circuit, and the temperature of the temperature sampling element in the rectifier of the ups is obtained through the first temperature sampling circuit;
the first signal transmission circuit is respectively connected with the first voltage sampling circuit, the first current sampling circuit, the first temperature sampling circuit and the main control unit, and respectively sends the sampling voltage of the first voltage sampling circuit, the sampling current of the first current sampling circuit and the sampling temperature of the first temperature sampling circuit to the main control unit.
3. The fire alarm system of claim 2, wherein the main control unit includes a first alarm unit and a first storage unit for storing a first temperature threshold, a first voltage threshold, a first current threshold;
the first alarm unit outputs a first fire alarm signal when the sampling temperature from the first signal transmission circuit reaches the first temperature threshold value and the sampling voltage from the first signal transmission circuit reaches the first voltage threshold value;
or, the first alarm unit outputs a first fire alarm signal when the sampling temperature from the first signal transmission circuit reaches the first temperature threshold value and the sampling current from the first signal transmission circuit reaches the first current threshold value.
4. The fire alarm system of claim 3, wherein the first storage unit stores a second temperature threshold, a second voltage threshold, a second current threshold, the second temperature threshold being less than the first temperature threshold, the second voltage threshold being less than the first voltage threshold, the second current threshold being less than the first current threshold;
the first alarm unit outputs a first fire pre-alarm signal when the sampling temperature from the first signal transmission circuit is greater than the second temperature threshold and less than a first temperature threshold, and the sampling voltage from the first signal transmission circuit is greater than the second voltage threshold and less than a first voltage threshold;
or, the first alarm unit outputs a first fire pre-alarm signal when the sampling temperature from the first signal transmission circuit is greater than the second temperature threshold and less than a first temperature threshold, and the sampling current from the first signal transmission circuit is greater than the second current threshold and less than a first current threshold.
5. The fire alarm system according to any one of claims 1 to 4, wherein the predetermined detection point includes an inverter, the detection unit includes a second voltage sampling circuit, a second current sampling circuit, a second temperature sampling circuit, and a second signal transmission circuit, and acquires a voltage of a voltage sampling element in the inverter of the uninterruptible power supply through the second voltage sampling circuit, a current of a current sampling element in the inverter of the uninterruptible power supply through the second current sampling circuit, and a temperature of the temperature sampling element in the inverter of the uninterruptible power supply through the second temperature sampling circuit;
and the second signal transmission circuit is respectively connected with the second voltage sampling circuit, the second current sampling circuit, the second temperature sampling circuit and the main control unit, and sends sampling signals of the second voltage sampling circuit, the second current sampling circuit and the second temperature sampling circuit to the main control unit.
6. The fire alarm system of claim 5, wherein the main control unit includes a second alarm unit and a second storage unit for storing a third temperature threshold, a third voltage threshold, and a third current threshold;
the second alarm unit outputs a second fire alarm signal when the sampling temperature from the second signal transmission circuit is greater than the third temperature threshold value and the sampling voltage from the second signal transmission circuit is greater than the third voltage threshold value;
or, the second alarm unit outputs a second fire alarm signal when the sampled temperature from the second signal transmission circuit reaches the third temperature threshold and the sampled current from the second signal transmission circuit reaches the third current threshold.
7. The fire alarm system of claim 6, wherein the second storage unit stores a fourth temperature threshold, a fourth voltage threshold, and a fourth current threshold, the fourth temperature threshold being less than a third temperature threshold, the fourth voltage threshold being less than a third voltage threshold, the fourth current threshold being less than the third current threshold;
the second alarm unit outputs a second fire pre-alarm signal when the sampling temperature from the second signal transmission circuit is greater than the fourth temperature threshold and less than a third temperature threshold, and the sampling voltage from the second signal transmission circuit is greater than the fourth voltage threshold and less than a third voltage threshold;
or, the second alarm unit outputs a second fire alarm signal when the sampling temperature from the second signal transmission circuit is greater than the fourth temperature threshold and less than a third temperature threshold, and the sampling current from the second signal transmission circuit is greater than the fourth current threshold and less than a third temperature threshold.
8. The fire alarm system according to any one of claims 1 to 4, wherein the predetermined detection point includes a dc bus capacitor, the detection unit includes a third voltage sampling circuit, a third temperature sampling circuit, and a third signal transmission circuit, and the voltage of the voltage sampling element on the dc bus of the uninterruptible power supply is acquired by the third voltage sampling circuit, and the temperature of the temperature sampling element on the dc bus capacitor of the uninterruptible power supply is acquired by the third temperature sampling circuit;
and the third signal transmission circuit is respectively connected with the third voltage sampling circuit, the third temperature sampling circuit and the main control unit and sends sampling signals of the third voltage sampling circuit and the third temperature sampling circuit to the main control unit.
9. The fire alarm system of claim 8, wherein the main control unit includes a third alarm unit and a third storage unit for storing a voltage amplitude drop threshold, a voltage drop change rate threshold, a fifth voltage threshold, a fifth temperature threshold;
the third alarm unit outputs a third fire alarm signal when the sampling temperature from the third signal transmission circuit reaches the fifth temperature threshold value and the sampling voltage from the third signal transmission circuit reaches the fifth voltage threshold value;
or the third alarm unit outputs a third fire alarm signal when the sampling temperature from the third signal transmission circuit is greater than the fifth temperature threshold, the sampling voltage from the third signal transmission circuit exceeds the voltage amplitude drop threshold, and the voltage drop change rate of the sampling voltage exceeds the voltage drop change rate threshold.
10. An uninterruptible power supply comprising a housing and a rectifier, an inverter and a dc bus capacitor located within the housing, wherein the uninterruptible power supply further comprises a fire alarm system as in any of claims 1-9, and the fire alarm system is located within the housing.
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