CN216926960U

CN216926960U - Sensor for detecting power supply state

Info

Publication number: CN216926960U
Application number: CN202220279684.3U
Authority: CN
Inventors: 戚耀刚
Original assignee: Shanghai Cangjie Intelligent Technology Co ltd
Current assignee: Shanghai Cangjie Intelligent Technology Co ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-07-08
Anticipated expiration: 2032-02-11

Abstract

A sensor for detecting power supply state comprises a stabilized voltage power supply, a storage battery, a voltage overvoltage statistic alarm circuit, a voltage undervoltage statistic alarm circuit, a wireless receiving control circuit and a wireless temperature detection mechanism, wherein the stabilized voltage power supply is connected with the storage battery; the wireless temperature detection mechanism comprises a temperature detection circuit, a thermistor and a magnet, the second way of stabilized voltage supply, the second storage battery, the temperature detection circuit and the thermistor are arranged in the element box B and electrically connected, and the magnet is arranged at the rear outer end of the element box B. This novel can conveniently shift temperature monitoring area, can gather the voltage too high or cross the low data, can report to the police when unusual to can take notes the voltage too high or cross the low number of times, adjust power supply load for power supply department and play technical support, can break off the main power supply when the temperature is unusual, can play good safe power supply effect.

Description

Sensor for detecting power supply state

Technical Field

The utility model relates to the technical field of power supply detection equipment, in particular to a sensor for detecting a power supply state.

Background

In areas such as distribution rooms, sensors for monitoring the working temperature of equipment such as power supply voltage and power distribution cabinets in real time are generally installed to ensure safe power supply. Although the existing voltage sensor can monitor power supply data, the voltage sensor is limited by the structure, and the voltage sensor cannot provide technical support for adjusting power supply load for a power supply department because the voltage sensor does not have the function of recording the times of overhigh or overlow voltage in unit time.

In addition, the existing temperature sensor monitors the field temperature, and generally only can give out alarm sound to prompt relevant managers when the temperature is abnormal, so that if the temperature is increased due to load short circuit and the like, the protection equipment in the power distribution cabinet is not tripped in extreme conditions, the power utilization load is further damaged due to continuous temperature increase, the equipment in the power distribution cabinet is damaged, and the like; furthermore, current temperature sensor generally is through the fixed installation such as screw nut, and when the staff need change monitoring temperature region in the actual management (for example in the practical application, the consumer actual temperature of original monitoring is not high, and other certain consumers need carry out temperature measurement to it because the great temperature rise of load is higher), just only reinstall new temperature sensor, can bring certain inconvenience for the user like this, and also increased unnecessary expense. In summary, it is particularly necessary to provide a power supply state sensor that cannot monitor power supply voltage data, can count times of too high and too low power supply voltages, and can conveniently transfer a temperature monitoring area.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects that the voltage and temperature sensors used in the existing power supply field cannot record the times of overhigh or overlow voltage in unit time due to the structural limitation, cannot provide technical support for power supply department to adjust power supply load, cannot effectively ensure to cut off a power supply when the temperature is abnormal, and the defect that the temperature monitoring area can not be changed conveniently, the utility model provides the device which can not only monitor the field power supply voltage data in real time under the combined action of relevant mechanisms and circuits, can give an alarm in real time when the voltage is abnormal, can record the times of over-high and over-low voltage in unit time, can provide favorable technical support for a power supply department to adjust power supply load, the sensor for detecting the power supply state can be installed through magnet attraction and the like, can conveniently replace the temperature monitoring position, and can timely disconnect the main power supply when the temperature of a monitoring area is abnormal, so that a good safe power supply effect can be achieved.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a sensor for detecting power supply state comprises a stabilized voltage power supply and a storage battery, and is characterized by also comprising a voltage overvoltage statistic alarm circuit, a voltage undervoltage statistic alarm circuit, a wireless receiving control circuit and a wireless temperature detection mechanism; the storage batteries are at least two, the number of the storage batteries is two, the storage batteries are provided with two paths of stabilized voltage power supplies, the first storage battery, the first path of stabilized voltage power supply, the voltage overpressure statistical alarm circuit, the voltage undervoltage statistical alarm circuit and the wireless receiving control circuit are arranged in an element box A, and the element box A is arranged in a power distribution cabinet; the wireless temperature detection mechanism comprises a temperature detection circuit, a thermistor and a magnet, the second storage battery, the second path of stabilized voltage power supply, the temperature detection circuit and the thermistor are arranged in the element box B, and the magnet is arranged at the outer end of the element box B; the control power supply output end of the wireless receiving control circuit is electrically connected with the main power supply input end of the electric load; the thermistor is electrically connected with the signal input end of the temperature detection circuit; and the signal output end of the voltage overvoltage statistical alarm circuit is electrically connected with the signal input end of the voltage undervoltage statistical alarm circuit.

Further, the voltage overpressure statistic alarm circuit comprises an adjustable resistor, a resistor, an NPN triode, a counter, a rectifier bridge stack, a buzzer, a relay, a transformer and a capacitor which are electrically connected, wherein a positive power supply output end of the rectifier bridge stack is connected with a positive electrode of the capacitor, one end of the adjustable resistor, a positive power supply input end of a first relay, a positive power supply input end of a second relay and a control power supply input end, a negative power supply output end of the rectifier bridge stack is connected with a negative electrode of the capacitor, one end of the first resistor, an emitting electrode of the NPN triode, a negative power supply input end of the counter and a negative power supply input end of the buzzer, the other end of the first resistor is connected with one end of the second resistor and the other end of the adjustable resistor, the other end of the second resistor is connected with an NPN triode base electrode, and a collector electrode of the triode is connected with the negative power supply input ends of the first relay and the second relay, two ends of a secondary winding of the transformer are respectively connected with two ends of a power input of the rectifier bridge stack, a control contact end and a normally open contact end of the first relay are respectively connected with two contacts under a counting key of the counter, and a normally open contact end of the second relay is connected with a positive power input end of the buzzer.

Furthermore, the undervoltage statistic alarm circuit comprises an adjustable resistor and a resistor which are electrically connected, an NPN triode, a counter, a buzzer and a relay, one end of an adjustable resistor is connected with a positive power input end of a first relay, a positive power input end of a second relay and a control power input end, one end of the first resistor is connected with an emitting electrode of an NPN triode, a negative power input end of a counter and a negative power input end of a buzzer, the other end of the first resistor is connected with one end of the second resistor and the other end of the adjustable resistor, the other end of the second resistor is connected with a base electrode of the NPN triode, a collecting electrode of the NPN triode is connected with the negative power input ends of the first relay and the second relay, a control contact end and a normally closed contact end of the first relay are respectively connected with two contacts under a counting key of the counter, and a normally closed contact end of the second relay is connected with the positive power input end of the buzzer.

Further, the wireless receiving control circuit comprises a wireless receiving circuit module and a resistor which are electrically connected, an NPN triode, a relay and a direct-current electromagnetic contactor, wherein a positive power input end of the wireless receiving circuit module is connected with a positive power input end of the relay and a control power input end of the relay, the first path output end of the wireless receiving circuit module is connected with one end of the resistor, the other end of the resistor is connected with a base electrode of the NPN triode, a collector electrode of the NPPN triode is connected with a negative power input end of the relay, a negative power input end of the wireless receiving circuit module is connected with an emitting electrode of the NPN triode and a negative power input end of the contactor, and a normally open contact end of the relay is connected with a positive power input end of the contactor.

Furthermore, the temperature detection circuit comprises a wireless transmitting circuit module, a silicon controlled rectifier and an adjustable resistor which are electrically connected, two contacts under one wireless signal transmitting key of the wireless transmitting circuit module are connected together, one end of the adjustable resistor is connected with a control electrode of the silicon controlled rectifier, and a cathode of the silicon controlled rectifier is connected with a positive power supply input end of the wireless transmitting circuit module.

Furthermore, the wireless temperature detection mechanism can adopt a plurality of sets and is respectively arranged in a plurality of areas needing temperature monitoring.

The utility model has the beneficial effects that: this novel wireless temperature detection mechanism passes through magnet actuation mode installation (still can use the non-setting adhesive mode installation when necessary), can conveniently shift temperature monitoring area like this as required (the actuation is outside the steel material casing of equipment). In the novel power supply voltage over-voltage statistical alarm circuit and the voltage under-voltage statistical alarm circuit, over-high or over-low data of the on-site power supply voltage can be collected in real time, on-site alarm can be realized when the voltage is abnormal, over-high or over-low frequency of the voltage can be recorded in real time, and subsequent related workers can conveniently look up the over-high or over-low abnormal frequency of the voltage in unit time, so that the power supply voltage over-voltage statistical alarm circuit and the over-low statistical alarm circuit can provide favorable technical support for power supply departments to adjust power supply loads; under the combined action of the wireless receiving control circuit and the wireless temperature detection mechanism, the main power supply can be timely disconnected when the temperature of the monitoring area is abnormal, so that a good safe power supply effect can be achieved. Based on the above, the utility model has good application prospect.

Drawings

The utility model is further illustrated below with reference to the figures and examples.

FIG. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 and 3 are circuit diagrams of the present invention.

Detailed Description

As shown in fig. 1, 2 and 3, a sensor for detecting a power supply state includes regulated power supplies a1 and a5, and storage batteries G1 and G2, and further includes a voltage overvoltage statistical alarm circuit 1, a voltage undervoltage statistical alarm circuit 2, a wireless receiving control circuit 3, and a wireless temperature detection mechanism; the device comprises two storage batteries and two stabilized voltage power supplies, wherein the first storage battery G1 and the first stabilized voltage power supply A1, a voltage overvoltage statistic alarm circuit 1, a voltage undervoltage statistic alarm circuit 2 and a wireless receiving control circuit 3 are arranged on a circuit board in an element box A4, and an element box A4 is arranged in a circuit board (not shown in the figure); the wireless temperature detection mechanism comprises a temperature detection circuit 5, a thermistor RT and a magnet 6, a second storage battery G2, the temperature detection circuit 5, the thermistor RT and a second path of stabilized voltage power supply A5 are installed on a circuit board in an element box B7, the heating surface of the thermistor RT is positioned outside an opening at the front end of the element box B7, a rectangular permanent magnet 6 is bonded at the rear outer side end of the element box B7 through glue, and the element box B7 is attracted at the outer side end of a power equipment shell needing temperature monitoring through the magnet 6.

As shown in fig. 1, 2 and 3, two-way regulated power supplies a1 and a5 are finished products of 220V/12V/30W ac-220V-to-dc 12V switching power supply modules; the batteries G1 and G2 were 12V/6Ah lithium secondary batteries. The voltage overvoltage statistic alarm circuit comprises an adjustable resistor RP1, resistors R1 and R2, an NPN triode Q1, a counter A, a rectifier bridge stack A2, a buzzer B1, relays K and K3, a transformer T and a capacitor C1 which are connected through circuit board wiring, wherein a pin 3 of a positive power supply output end of the rectifier bridge stack A2 is connected with a positive electrode of the capacitor C1, one end of the adjustable resistor RP1, a positive power supply input end of a first relay K, a positive power supply input end of a second relay K3 and a control power supply input end, a pin 4 of a negative power supply output end of the rectifier bridge stack A2 is connected with a negative electrode of the capacitor C1, one end of a first resistor R1, an emitter of the NPN triode Q1, a pin 2 of a negative power supply input end of the counter A and a negative power supply input end of the buzzer B1, the other end of the first resistor R1 is connected with one end of a second resistor R2 and the other end of the adjustable resistor RP1, the other end of the second resistor R2 is connected with a base of the triode Q1, the collector of an NPN triode Q1 is connected with the negative power input ends of a first relay K and a second relay K3, the two ends of the secondary winding of a transformer T are respectively connected with pins 1 and 2 of the power input end of a rectifier bridge stack A2, the control contact end and the normally open contact end of the first relay K are respectively connected with the two contacts under a counting key J of a counter A, and the normally open contact end of the second relay K3 is connected with the positive power input end of a buzzer B1. The low voltage statistical alarm circuit comprises an adjustable resistor RP2, resistors R3 and R4, an NPN triode Q2, a counter A3, a buzzer B2, relays K1 and K4 which are connected through circuit board wiring, one end of the adjustable resistor RP2 is connected with the positive power input end of a first relay K1, the positive power input end of a second relay K4 and the control power input end, one end of the first resistor R3 is connected with the emitter of the NPN triode Q2, the 2 feet of the negative power input end of the counter A3 and the negative power input end of the buzzer B2, the other end of the first resistor R3 is connected with one end of the second resistor R4 and the other end of the adjustable resistor RP2, the other end of the second resistor R4 is connected with the base of the NPN triode Q2, the collector of the NPN triode Q2 is connected with the power input ends of the first relay K1 and the second relay K4, the normally closed relay control end of the first relay K1 and the normally closed contact A3 are respectively connected with the counting key under the counter J contact point of the counter A3, the normally closed contact end of the second relay K4 is connected with the positive power supply input end of the buzzer B2. Two contacts under counters A3 and zero clearing keys Q of the A of the over-voltage and over-voltage statistical alarm circuit are respectively connected with two incoming lines of a power switch S through leads, and an operating handle of the power switch S is positioned outside an opening at the front end of the element box A.

As shown in fig. 1, 2 and 3, the wireless receiving control circuit includes a wireless receiving circuit module a4 (with a coding circuit inside, capable of preventing the wireless signals received by the same type wireless receiving circuit module from interfering with each other) of type SF1500 connected through circuit board wiring, a resistor R5, an NPN transistor Q3, a relay K2, and a dc electromagnetic contactor K5, wherein a pin 1 of a positive power supply input terminal of the wireless receiving circuit module a4 is connected with a positive power supply input terminal of the relay K2 and a control power supply input terminal, a pin 4 (3, 5, 6, and 7 pins are suspended) of a first output terminal of the wireless receiving circuit module a4 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with a base of the NPN transistor Q3, a collector of the NPN transistor Q3 is connected with a negative power supply input terminal of the relay K2, a pin 3 of a negative power supply input terminal of the wireless receiving circuit module a4 is connected with a negative power supply input terminal of the NPN transistor Q3 and an emitter of the NPN contactor K5, the normally open contact end of the relay K2 is connected with the positive power supply input end of the contactor K5. The temperature detection circuit comprises a wireless transmitting circuit module finished product A6 (a coding circuit is arranged inside the wireless transmitting circuit module, the wireless transmitting circuit module can prevent wireless signals transmitted by the wireless transmitting circuit modules of the same type from interfering with each other) of the type SF1500 connected through circuit board wiring, a silicon controlled rectifier VS and an adjustable resistor RP3, two contacts under a first wireless signal transmitting key S1 of the wireless transmitting circuit module A6 are connected together through a lead, one end of the adjustable resistor RP3 is connected with a control electrode of the silicon controlled rectifier VS, and a cathode of the silicon controlled rectifier VS is connected with a pin 1 at a positive power supply input end of the wireless transmitting circuit module A6. The wireless temperature detection mechanism can adopt a plurality of sets and be respectively arranged in a plurality of areas needing temperature monitoring, and the encoding circuit codes of the wireless transmitting circuit module A6 of the wireless temperature detection mechanisms are consistent.

As shown in fig. 1 and 2, two ends of a power input end 1 and a pin 2 of a first path of stabilized voltage supply a1 and two ends of a primary winding of a signal input end transformer T of a voltage overvoltage statistical alarm circuit are respectively connected with one phase line and a zero line (220V) of a three-phase four-wire alternating current power supply through leads, a power output end 3 and a pin 4 of a first path of stabilized voltage supply a1 are respectively connected with a pin 1 and a pin 2 of a power input end counter a of the voltage overvoltage statistical alarm circuit, a pin 1 and a pin 2 of a low voltage statistical alarm circuit counter A3, a positive power input end of a power input end relay K2 of a wireless receiving control circuit, an emitter of an NPN triode Q3, and two poles of a first storage battery G1 are respectively connected through leads. The three-phase four-wire alternating current power supply and four control power supply input ends of a contactor K5 of the wireless receiving control circuit are respectively connected through leads, and four normally closed control power supply output ends of a contactor K5 of the wireless receiving control circuit are respectively connected with four main power supply input ends of an electric load FH through leads. The power input end 1 and the power input end 2 of a second path of stabilized voltage supply A5 are respectively connected with the two poles of an alternating current 220V power supply through leads, the power output end 3 and the power output end 4 of a second path of stabilized voltage supply A5 are connected with a silicon controlled rectifier VS anode of the power input end of a temperature detection circuit and a pin 2 of a wireless transmitting circuit module A6, the pin 3 of a stabilized voltage supply A5 is connected with the power input end of one end of a thermistor RT through leads, and the other end of the thermistor RT is connected with the other end of a signal input end adjustable resistor RP3 of the temperature detection circuit through leads;

pins

3 and 4 of a rectifier bridge stack A2 at a signal output end of the voltage overvoltage statistical alarm circuit and a signal input end relay K1 positive power supply input end of the voltage undervoltage statistical alarm circuit and an emitting electrode of an NPN triode Q2 are respectively connected through leads.

Fig. 1, 2, 3 show, in operation, 220V alternating current power supply gets into constant voltage power supply a1 and voltage superpressure statistics warning circuit's transformer T's primary winding both ends, constant voltage power supply a 1's power output end can export stable direct current 12V direct current power supply and get into voltage superpressure statistics warning circuit, the low statistics warning circuit of voltage, wireless reception control circuit's power input end, above-mentioned circuit is in the operating condition that obtains electricity, 12V direct current power supply of output gets into battery G1 simultaneously and float for battery G1 and charge, guaranteed this novel relevant circuit can also normally work after having a power failure. Stabilized voltage supply A5 can export stable direct current 12V power and can get into wireless temperature detection mechanism's power input end after getting the electricity, and then, wireless temperature detection mechanism gets the work of getting the electricity, and the 12V direct current power supply of output gets into battery G2 simultaneously and floats for battery G2 and charges, has also guaranteed this novel relevant circuit can also normally work after having a power failure. In the novel rectifier bridge, after an input alternating current 220V power supply enters a primary winding of a transformer T, an alternating current 12V power supply is output from two ends of a secondary winding of the transformer T and enters pins 1 and 2 of a rectifier bridge stack A2, and

pins

3 and 4 of the rectifier bridge stack A2 can output a direct current power supply (a capacitor C1 plays a role in filtering) and enter one end of an adjustable resistor RP1, the other end of a resistor R1, one end of an adjustable resistor RP2 and the other end of a resistor R3; the dc supply voltage output through

pins

3 and 4 of the bridge rectifier a2 also changes synchronously as the input voltage fluctuates. In the voltage overpressure statistical alarm circuit, when 380V power supply voltage is in a normal state (354V-406V), the voltage is not ultrahigh, a direct current power supply close to 12V is subjected to voltage division through an adjustable resistor RP1 and a resistor R1, the voltage is reduced and the current is limited through a resistor R2, the base voltage of a base electrode of an NPN triode Q1 is lower than 0.7V, and the NPN triode Q1 is cut off, so that a rear-stage relay K, K3 cannot be electrified and pulled in, a counter A cannot count, and a buzzer B1 cannot sound; when the 380V power supply voltage is abnormal, the voltage exceeds 406V, a larger direct current power supply which exceeds 12V is divided into partial voltage through the adjustable resistor RP1 and the resistor R1, the partial voltage is reduced through the resistor R2 and limited in current, the base voltage of the NPN triode Q1 is higher than 0.7V, the NPN triode Q1 conducts the collector to output low level, the low level enters the power input ends of the negative electrodes of the relays K and K3, the relays K and K3 are electrified to attract the control contact ends and the normally open contact ends of the relays to be closed, then the counting key J of the counter A is closed once, the counter A carries out once accumulation counting, and meanwhile, the buzzer B1 can be electrified to sound to clearly prompt people nearby sites that the input voltage is ultrahigh.

As shown in fig. 1, 2 and 3, in the statistical alarm circuit for undervoltage, when a 380V power supply is in a normal state (354V-406V), the voltage is not too low, a direct-current power supply close to 12V is divided by an adjustable resistor RP2 and a resistor R3, and then is subjected to voltage reduction and current limitation by a resistor R4, the base voltage of an NPN triode Q2 is higher than 0.7V, the NPN triode Q2 conducts a collector to output a low level to enter a negative power input end of a relay K1 and a relay K4, the relays K1 and K4 are powered to attract a control contact end and a normally closed contact end of the relays to be open, a counter a cannot count, and a buzzer B2 cannot sound; when the 380V power supply voltage is in an abnormal state, the voltage is lower than 354V, a smaller direct current power supply lower than 12V is divided by an adjustable resistor RP2 and a resistor R3, and then is subjected to voltage reduction and current limiting through a resistor R4, the base voltage of a triode Q2 is lower than 0.7V, the cut-off collector of the triode Q2 does not output low level to enter the input ends of the negative power supplies of the relays K1 and K4, the relays K1 and K4 lose power and do not attract the control contact ends and the normally closed contact ends of the relays to be closed, a counting key J of a counter A3 is closed once, the counter A3 carries out once accumulation counting, and meanwhile, a buzzer B2 can be electrified to sound to clearly prompt nearby personnel to that the input voltage is too low. Through the above, the novel power supply voltage over-high or over-low data acquisition device can acquire over-high or over-low data of on-site power supply voltage in real time, can give an alarm on site when the over-high or over-low voltage is abnormal (until the power switch D1 is turned off, the operating handle of the power switch D1 is positioned outside the opening at the front end of the element box A), can record the times of over-high or over-low voltage in real time, and can be used for conveniently searching the times of over-high or over-low abnormal voltage in unit time through the accumulated counting of the counter A and the counter A3 by subsequent related workers, thereby playing a favorable technical support for the power supply department to adjust the power supply load; after knowing the relevant data, the worker can press the power switch S, so that the two contacts of the zero clearing keys Q of the counters a and a34 are closed, and the counts of the counters a and A3 are cleared, so as to prepare for counting the power supply abnormality next time.

As shown in fig. 1 and 2, when the temperature of the monitoring area is lower than a certain temperature (for example, 35 ℃), the thermistor RT has relatively small heat and large resistance, so that the voltage of the 12V power supply, which enters the thyristor VS after being reduced and limited by the thermistor RT and the adjustable resistor RP3, is lower than the trigger conducting voltage (0.8V) of the thyristor VS, and then the wireless transmitting circuit module a6 does not transmit a wireless signal. When the temperature of the monitoring area is higher than a certain temperature (for example, higher than 35 ℃), the thermistor RT has relatively large heat and small resistance value, so that the voltage of a 12V power supply, which enters the thyristor VS control electrode after being subjected to voltage reduction and current limitation by the thermistor RT and the adjustable resistor RP3, is higher than the trigger conducting voltage of the thyristor VS (a technician can set the detection temperature by adjusting the resistance value of the adjustable resistor RP3, when the resistance of the adjustable resistor RP3 is relatively large, the thyristor VS is conducted when the field temperature is relatively high and the resistance value of the thermistor RT is relatively low, when the resistance of the adjustable resistor RP3 is relatively small, the thyristor VS is conducted when the field temperature is relatively low and the resistance value of the thermistor RT is relatively high, the thyristor VS is triggered to conduct the cathode and output high level, the thyristor VS enters the positive power supply input end of the wireless transmitting circuit module a6, and because two contacts under the first signal transmitting button S1 of the wireless transmitting circuit module a6 are connected together in advance Therefore, when the field temperature exceeds the limit, the wireless transmitting circuit module A6 can transmit the first path of wireless closing signal. When the temperature of one or more monitoring areas (under the premise of multiple sets of wireless temperature detection mechanisms) exceeds the standard, the wireless transmitting circuit module A6 transmits a first wireless closing signal, the wireless receiving circuit module A4 outputs a high level after receiving the first wireless closing signal, the high level is reduced voltage and limited current by the resistor R5 and enters the base of the NPN triode Q3, the NPN triode Q3 conducts the collector and outputs a low level to enter the negative power input end of the relay K2, then the relay K2 is electrified to attract the control power input end and the normally open contact end to be closed, furthermore, the electromagnetic contactor K5 is electrified to close the four control power input ends and the four normally closed contact ends of the electromagnetic contactor to be open, then the main power supply is disconnected with the electric load FH until a worker finds out the reason of overhigh temperature, and the relay K2 and the contactor K5 lose power and recover power supply until the power switch D2 is turned off (the operating handle is positioned outside the opening at the front end of the element box B). Under the combined action of the wireless receiving control circuit and the wireless temperature detection mechanism, the main power supply can be timely disconnected when the temperature of the monitoring area is abnormal, and a good safe power supply effect can be achieved. During production, technicians can connect the input power supply of the internal stabilized voltage power supply A1 and the transformer T into the power transformer capable of adjusting output, firstly adjust the output voltage of the power transformer to be slightly higher than 406V, then determine to adjust the resistance value of the adjustable resistor RP1, just adjust the resistance value of the adjustable resistor RP1 after the buzzer B1 sounds, then adjust the output voltage of the power transformer to be slightly lower than 354V, then determine to adjust the resistance value of the adjustable resistor RP2, just adjust the resistance value of the adjustable resistor RP2 after the buzzer B2 sounds, and then adjust the resistance value of the adjustable resistor RP2 to be required; after the adjustment is finished, the power supply is disconnected, the adjustable resistors RP1 and RP2 are taken down to respectively measure the resistance values at the moment, and the resistance values of the adjustable resistors RP1 and RP2 can be directly adjusted in place (or replaced by the same fixed resistor) in subsequent batch production without determining the resistance values again. In fig. 2 and 3, model numbers of NPN triodes Q1, Q2 and Q3 are 9013; relays K, K3, K2, K1, K4 are DC12V relays; buzzers B1 and B2 are finished products of active continuous sound buzzers of model SF 12V; the counter A and the counter A3 are finished products of counters of model SD76, the counter has two power supply input ends, the counter has a voltage-free trigger port J, after two terminals of the trigger port are closed, the counter carries out one-time accumulation counting and is displayed by a display screen, the counter also has a zero clearing key L, and after the zero clearing key is pressed down, the counting of the timer is cleared and the counting is restarted; the thermistor RT model is a negative temperature coefficient thermistor of NTC 103D; the transformer T is an alternating current transformer with the input voltage of alternating current of 220V and the output voltage of alternating current of 12V; the capacitor C1 is an electrolytic capacitor with model number 470 muF/25V; the model of the rectifier bridge stack A2 is KBU 810; the direct current electromagnetic contactor is a direct current contactor with the model number SD-N21 and the working voltage direct current of 12V; the resistances R1, R2, R3, R4 and R5 are respectively 1K, 100K, 1K, 100K and 20K; the models of the adjustable resistors RP1, RP2 and RP3 are respectively 20K (adjusted to be about 12K), 10K (adjusted to be about 11K) and 6M (adjusted to be about 5.6M, and the controllable silicon VS is a plastic single-phase controllable silicon of the model MCR 100-1.

While there have been shown and described what are at present considered the fundamental principles and essential features of the utility model and its advantages, it will be apparent to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sensor for detecting power supply state comprises a stabilized voltage power supply and a storage battery, and is characterized by also comprising a voltage overvoltage statistic alarm circuit, a voltage undervoltage statistic alarm circuit, a wireless receiving control circuit and a wireless temperature detection mechanism; the storage batteries are at least two, the number of the storage batteries is two, the storage batteries are connected with two paths of stabilized voltage power supplies, the first storage battery, the first path of stabilized voltage power supply, the voltage overvoltage statistical alarm circuit, the voltage underlow statistical alarm circuit and the wireless receiving control circuit are arranged in an element box A, and the element box A is arranged in a power distribution cabinet; the wireless temperature detection mechanism comprises a temperature detection circuit, a thermistor and a magnet, the second storage battery, the second path of stabilized voltage power supply, the temperature detection circuit and the thermistor are arranged in the element box B, and the magnet is arranged at the outer end of the element box B; the control power supply output end of the wireless receiving control circuit is electrically connected with the main power supply input end of the electric load; the thermistor is electrically connected with the signal input end of the temperature detection circuit; and the signal output end of the voltage overvoltage statistical alarm circuit is electrically connected with the signal input end of the voltage undervoltage statistical alarm circuit.

2. The sensor of claim 1, wherein the voltage overpressure statistic alarm circuit comprises an electrically connected adjustable resistor, a resistor, an NPN transistor, a counter, a bridge rectifier, a buzzer, a relay, a transformer and a capacitor, wherein a positive power output terminal of the bridge rectifier is connected with a positive terminal of the capacitor, one terminal of the adjustable resistor, a positive power input terminal of a first relay, a positive power input terminal of a second relay and a control power input terminal, a negative power output terminal of the bridge rectifier is connected with a negative terminal of the capacitor, one terminal of the first resistor, an emitter of the NPN transistor, a negative power input terminal of the counter and a negative power input terminal of the buzzer, the other terminal of the first resistor is connected with one terminal of the second resistor and the other terminal of the adjustable resistor, the other terminal of the second resistor is connected with a base of the NPN transistor, and a collector of the NPN transistor is connected with the first relay and the second negative power input terminal of the relay, two ends of a secondary winding of the transformer are respectively connected with two ends of a power input of the rectifier bridge stack, a control contact end and a normally open contact end of the first relay are respectively connected with two contacts under a counting key of the counter, and a normally open contact end of the second relay is connected with a positive power input end of the buzzer.

3. The sensor of claim 1, wherein the undervoltage statistic alarm circuit comprises an adjustable resistor and a resistor, an NPN transistor, a counter, a buzzer, and a relay, which are electrically connected, wherein one end of the adjustable resistor is connected to the positive power input terminal of the first relay, the positive power input terminal of the second relay, and the control power input terminal, one end of the first resistor is connected to the emitter of the NPN transistor, the negative power input terminal of the counter, and the negative power input terminal of the buzzer, the other end of the first resistor is connected to one end of the second resistor, the other end of the adjustable resistor, the other end of the second resistor is connected to the base of the NPN transistor, the collector of the NPN transistor is connected to the negative power input terminals of the first relay and the second relay, the control contact terminal and the normally closed contact terminal of the first relay are respectively connected to the two contacts under the counting key of the counter, the normally closed contact end of the second relay is connected with the positive power supply input end of the buzzer.

4. The sensor of claim 1, wherein the wireless receiving control circuit comprises a wireless receiving circuit module and a resistor, an NPN triode, a relay and a DC electromagnetic contactor which are electrically connected, a positive power input end of the wireless receiving circuit module is connected with a positive power input end of the relay and a control power input end, a first output end of the wireless receiving circuit module is connected with one end of the resistor, the other end of the resistor is connected with a base of the NPN triode, a collector of the NPPN triode is connected with a negative power input end of the relay, a negative power input end of the wireless receiving circuit module is connected with a negative power input end of an emitter of the NPN triode and a negative power input end of the contactor, and a normally open contact end of the relay is connected with a positive power input end of the contactor.

5. The sensor of claim 1, wherein the temperature detection circuit comprises a wireless transmission circuit module, a thyristor and an adjustable resistor, the wireless transmission circuit module is electrically connected, two contacts of one wireless signal transmission button of the wireless transmission circuit module are connected together, one end of the adjustable resistor is connected with a control electrode of the thyristor, and a cathode of the thyristor is connected with a positive power supply input end of the wireless transmission circuit module.

6. The sensor for detecting the power supply state according to claim 1, wherein the wireless temperature detection mechanism can be installed in a plurality of sets in a plurality of areas needing temperature monitoring respectively.