CN112067973A - Load detection chip for commodity safety - Google Patents
Load detection chip for commodity safety Download PDFInfo
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2855—Environmental, reliability or burn-in testing
- G01R31/2856—Internal circuit aspects, e.g. built-in test features; Test chips; Measuring material aspects, e.g. electro migration [EM]
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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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
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2855—Environmental, reliability or burn-in testing
- G01R31/2872—Environmental, reliability or burn-in testing related to electrical or environmental aspects, e.g. temperature, humidity, vibration, nuclear radiation
- G01R31/2879—Environmental, reliability or burn-in testing related to electrical or environmental aspects, e.g. temperature, humidity, vibration, nuclear radiation related to electrical aspects, e.g. to voltage or current supply or stimuli or to electrical loads
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
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Abstract
The invention provides a load detection chip for commodity security, comprising: a voltage control module configured to be able to provide a supply voltage to a load; a voltage monitoring module configured to be able to monitor a voltage value across a load; and the output module is used for outputting a safety signal through the output module when the voltage value exceeds a set threshold. The invention designs a load detection chip which has small volume, light weight, high detection effect, stable work, high reliability and high dynamic response and is used for commodity safety.
Description
Technical Field
The invention relates to the field of commodity anti-theft, in particular to a circuit design in a commodity anti-theft device.
Background
The anti-theft of goods is an industry which is produced along with the development of society and science and technology, in the field of anti-theft of goods, there are many subdivided fields, for example, an anti-theft device is arranged at the entrance and exit of a supermarket or a store for detecting whether goods are taken away from the store, this is usually an EAS (also called electronic article anti-theft system), which is one of the goods security measures widely used in the large retail industry at present.
The showplace is a subdivision field different from EAS, and the showplace is generated in occasions where functional display of commodities is generally required to purchasers or potential purchasers, especially in the times of vigorous development of electronic products, the commodities used for display can represent commodities of a certain style, the commodities used for display are not only visually displayed, but also can be directly operated and played by experiencers in the places, and some functions of the commodities which cannot be known through watching or reading specifications are displayed in such a way, because the displayed commodities are directly contacted and used by the experiencers, the displayed commodities and users are in zero-distance contact, which is different from the retail industry that in the places of the retail industry, if the purchasers use the commodities, the rules of the retail industry are violated, or inappropriate behavior is made, but on the exhibit, any use and experience behavior is allowed, which causes the exhibited article to face a greater risk than the retail article, and the article to be exhibited is high in value due to the various functions and complex design, and even if the exhibit is lost, the seller is not damaged, therefore, in the exhibited article theft-proof industry, generally speaking, each exhibited article is provided with a theft-proof device, such as a warning device described below, and sometimes a plurality of articles are provided with one theft-proof device, and the main functions of the theft-proof devices are not only to prevent the article from being taken away from the exhibiting place, but also to prevent the article from being separated from the theft-proof device, namely, the theft-proof requirement is tighter than the article from being taken away from the theft-proof place.
In the field of commodity theft prevention, a warning device is a device for providing a warning effect for commodity theft prevention as the name implies, and the most common effect of the warning device is to send out an alarm and/or a prompt when a commodity is possibly at a theft risk, so as to remind workers in a place or frighten people who steal the commodity. In the prior art of the anti-theft field of goods, a common warning device usually comprises an alarm and a signal lamp, and sends out a warning signal in a sound-light prompting mode, in the field of anti-theft of goods, the warning signal is also a common concept, but the warning signal has broad and narrow meanings, the warning signal in the narrow sense usually refers to a signal with a prompting or deterrent effect such as sound and light, the warning signal in the broad sense may also include a safety signal, for example, a sensing signal from a detecting device (sensor) for detecting whether the article is in a safe state, the sensing signal usually needs to be transmitted, for example, by means of cable, infrared, bluetooth, etc., the transmission of the sensing signal to the corresponding device can trigger the above-mentioned narrow warning signal, and in view of the above application scenarios, it is obvious that the transmission of the signal needs power support.
In addition, as mentioned above, many display commodities are usually electronic products, and have functions that can be realized only by operation, and the commodities in the display site need to be continuously supplied with power in the process of being continuously experienced due to being "genuine", so that power supply lines are often configured in addition to detecting the states of the commodities, for example, the commodities are connected to the commodities through signal lines. The three-wire method is excellent in safety, can play a good anti-theft role, and is very popular in the traditional anti-theft industry of display commodities.
However, with the development of science and technology, the continuous updating of commodities pushes the continuous development of the commodity anti-theft industry, after the display commodities become a more and more accepted sales mode, the requirements in other aspects besides security become more and more, for example, the traditional three lines need to be customized and cannot directly use common wires, so that the merchants performing display sales need to separately configure the anti-theft cable (also called as a security cable, i.e. a cable capable of playing a certain role in commodity anti-theft or commodity security), and the anti-theft cable is usually used for connecting commodities and anti-theft devices, because the commodities are continuously in the process of being experienced, the cable is naturally and continuously bent and twisted along with the experience of the commodities, the cable is firm in quality and short in service life, wherein the signal line is particularly easy to be damaged, once the signal line is damaged, even if the charging wire is still intact, the whole wire needs to be replaced, and for the increasingly popular commodity anti-theft industry, more and more merchants hope to reduce the cost on the anti-theft of exhibits so as to improve the sales profit; in the prior art, a common charging cable is also used for detecting, for example, whether a commodity is safe or not is judged according to the on-off of current, and theoretically, the common charging cable can also be used for connecting a circuit board, a sensor and an alarm in the commodity and the warning device to form a warning loop, and the circuit board can detect whether current flows through the charging cable or the warning loop, so as to judge whether the commodity is in a safe state; in practice, this kind of mode that detects through electric current needs to be realized through the functional circuit that a large amount of electronic devices are constituteed, and this kind of mode has increased whole anti-theft system design complexity on the one hand, causes stability to reduce, and it is whole great to cause equipment simultaneously because of a large amount of devices need PCB space to support, and on the other hand scheme cost input also can increase.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a load detection chip for merchandise security, which can be installed in a warning device for merchandise security, and the load detection chip is loaded with a load detection circuit, and the load detection circuit can supply power to the merchandise or form a detection loop with the merchandise, and can overcome the problems in the background art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a load detection chip for merchandise security, comprising:
a voltage control module configured to be able to provide a supply voltage to a load;
a voltage monitoring module configured to be able to monitor a voltage value across a load;
and the output module is used for outputting a safety signal through the output module when the voltage value exceeds a set threshold.
The voltage control module can input proper voltage according to the properties of different loads, for example, according to different rated voltages required by different loads, and the voltage control module comprises a voltage control circuit, and a comparator or a selection circuit can be arranged in the voltage control circuit to realize voltage input with different sizes.
The load in the invention can refer to the commodity which needs to be protected by the commodity anti-theft system, and can also refer to other circuit elements which have certain resistance and need certain working current and can be connected to the load detection chip, such as a sensor.
Further, the load detection chip is loaded with a load detection circuit, the load detection circuit is configured to be capable of detecting a voltage value across the load, the load detection chip is also loaded with a comparison and judgment circuit, the comparison and judgment circuit is capable of judging whether the voltage across the load is within a set threshold range according to the voltage value detected by the load detection chip, the voltage value is generally over-high or over-low, if the voltage value is 0, the circuit may be disconnected, so that no current flows across the commodity, if the voltage value is 0, the commodity may be considered to be in an unsafe state, at this time, the load detection chip may output a safety signal through the output module, if the voltage value across the load is over-high, the circuit may be abnormal, for example, if the load is a sensor, the component may be damaged by the over-high voltage.
Further, the load detection chip can be connected to a remote power supply, and the remote power supply provides power, generally speaking, the voltage provided by the remote power supply for the load detection chip meets the power supply requirement of the conventional electronic product.
Further, the load detection chip comprises at least one power input configured for receiving a power input; when the number of the power input ends of the load chip exceeds one, the load detection chip is configured to be adjustable in input voltage, for example, a selection switch is arranged among the power input ends through the power input ends, when smaller voltage needs to be accessed, the selection switch is toggled to select a gear with smaller voltage, and otherwise, a gear with larger voltage is selected.
Further, the load detection chip can be connected to a load through a security cable and supplies power to the load, when the load detection chip is connected to a remote power supply, the load detection chip can be further connected to the load (for example, a commodity) through the security cable, and the remote power supply indirectly supplies power to the commodity, at this time, the current passing through the security cable becomes a detection object of the load detection chip, that is, in this state, the load detection chip forms a detection loop through the security cable and the commodity.
Further, the load detection chip includes at least one power output terminal configured to be directly or indirectly connected to one end of a load, and the other end of the load is connected to a ground terminal, so as to form a power supply loop, which is also a detection loop.
Further, the load detection chip can be connected to a sensing module through a security cable, and the sensing module can be configured to detect whether the commodity is in a secure state, which is another embodiment of the present invention.
Further, the load detection chip comprises at least one signal detection terminal which is configured to be directly or indirectly connected to the sensing module and form a detection loop.
Further, the output module is configured to be capable of being connected to an alarm module, the alarm module is configured to be capable of responding to the safety signal to send out an alarm, the load detection chip of the invention can be installed in the warning device, meanwhile, the warning module can also be arranged in the warning device, and the alarm module can be connected to the load detection chip and used for responding to the load detection chip.
Further, the safety cable comprises at least two electric wires isolated from each other, wherein one of the electric wires is configured to be connected to the power output end or the signal detection end of the load detection chip, and the other electric wire is configured to be capable of being connected to the grounding end of the load detection chip and/or the power supply, so that a power supply or detection loop is formed.
The invention has the beneficial effects that:
(1) the invention designs a load detection chip which is used for commodity safety and has the advantages of small volume, light weight, high detection effect, stable work, high reliability and high dynamic response. The invention can confirm the commodity safety state by monitoring the voltage on the load, thereby ensuring the supervision and protection of the commodity, realizing the switching of the corresponding detection circuit, realizing the application under different scenes and improving the application range.
(2) The invention designs a load detection chip which can be arranged in a warning device, the load detection chip is provided with a load detection circuit for detecting whether the load in the circuit is normal or not, if the detection value of the load detection circuit exceeds the normal range, the load detection chip sends a safety signal or a warning signal and alarms through a warning module in the warning device, a commodity can be electrically connected to the load detection chip through a safety cable, through the design of the load detection chip and the load detection circuit, the load detection chip can be powered by a common power supply, and the detection circuit can detect the load detection circuit without bearing charging voltage, so that the safety cable can be used as an anti-theft cable on the premise of only playing a role of connecting the circuit, and the conventional charging cable can also be used as the charging cable of the invention, the usable range of the safety cable is expanded, thereby solving the problems in the background art.
(3) The load detection chip can be connected with a sensing module, a detection loop between the load detection chip and the sensing module which can be attached to a commodity is established, the sensing module can also be connected into a circuit like a common load, and the voltage of the connected load can be adjusted through a voltage control module, so that the load detection chip can be timely switched when different loads are connected, and the damage to the circuit and components caused by the fact that the connected voltage of the loads with different rated voltages is not proper is avoided.
Drawings
Fig. 1 is a block diagram of the overall structure of the present invention.
Fig. 2 is a structural diagram of a load detection chip of embodiment 1 of the present invention.
Fig. 3 is a circuit diagram of a load detection chip of embodiment 1 of the present invention.
Fig. 4 is a block diagram of a warning device according to embodiment 1 of the present invention.
Fig. 5 is a structural diagram of a load detection chip of embodiment 2 of the present invention.
Fig. 6 is a block diagram of a warning device according to embodiment 2 of the present invention.
Fig. 7 is a structural diagram of a load detection chip of embodiment 3 of the present invention.
Fig. 8 is a block diagram of a warning device according to embodiment 3 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples. It should be noted that the embodiments are only specific illustrations for the purpose of better understanding of the technical solutions of the present invention by those skilled in the art, and should not be construed as limitations of the present invention, and structures not described in detail can be understood as processing connections using conventional structures or circuits.
In addition, the embodiments and the features of the embodiments in the present invention may be combined with each other without conflict. In the description of the present embodiment, if the directions or positional relationships indicated by "center", "length", "width", "height", "up", "down", "front", "back", "left", "right", "large", "small", "top", "bottom", "inner", "outer", etc. are referred to based on the directions or positional relationships shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and not be construed as limiting the present invention in that the referenced sequences of "first," "second," etc., when referring to this description of the claims, are intended to distinguish between similar or functionally equivalent or technical terms, which are not necessarily meant to be exhaustive, and are not meant to be logically sequential or otherwise limiting. The scope of the present invention is defined by the appended claims.
Example 1, see figures 1-4.
As shown in fig. 1, the present invention provides a load detection chip for merchandise security, including a voltage control module, a voltage monitoring module and an output module, wherein the voltage control module is configured to be able to provide a supply voltage to a load; the voltage monitoring module is configured to be capable of monitoring a voltage value across the load; the load detection chip further comprises an output module, and the load detection chip is configured to be capable of outputting a safety signal through the output module when the voltage value monitored by the voltage monitoring module exceeds a set threshold.
The voltage control module can input proper voltage according to the properties of different loads, for example, according to different rated voltages required by different loads, and the voltage control module comprises a voltage control circuit, and a comparator or a selection circuit can be arranged in the voltage control circuit to realize voltage input with different sizes.
The load in this embodiment mainly refers to a commodity that needs to be protected by a commodity anti-theft system, a voltage monitoring circuit is loaded on the load detection chip of the present invention, the voltage monitoring circuit is configured to be able to detect a voltage value on the load, a comparison and judgment circuit is also loaded on the load detection chip, the comparison and judgment circuit is able to judge whether the voltage on the load is within a set threshold range according to the voltage value detected by the load detection chip, the voltage value is generally two cases, i.e. too high or too low, if the voltage value is 0, the circuit may be disconnected, resulting in no current passing on the commodity, if so, the commodity may be considered to be in an unsafe state, at this time, the load detection chip may output a safety signal through an output module, if the voltage value on the load is too high, the circuit may be abnormal, for example, the load is a sensor, excessive voltages may damage components.
The load detection chip can be placed in a warning device, the structure of the warning device loaded with the load detection chip is shown in fig. 2, and the warning device comprises an alarm module 1, a load detection chip 2, a safety cable 3 and a remote power supply 4. The load detection chip 2 includes a status output pin Flag, which is used to output a detection result signal of the load detection chip 2, for example, when the load detection chip 2 detects a non-safety state and needs to send a safety signal, the safety signal can be output through the status output pin Flag, and the status output pin Flag is configured to be capable of outputting a working status to the alarm module.
The load detection chip 2 further comprises a power input pin Vin, and the power input pin Vin can be connected with an output end of the remote power supply 4 to provide power for the load detection chip 2 and the alarm module 1 and the commodity connected with the load detection chip 2. The load detection chip 2 further comprises a GND pin, and the GND pin is connected with the alarm module 1 and a GND end of the remote power supply 4. The load detection chip 2 includes a power supply output pin Vout configured to be directly or indirectly connected to a security cable. The output end of the remote power supply 4 is also connected to the power supply access end of the alarm module 1.
The safety cable 3 comprises at least 2 wires which are electrically isolated from each other, wherein one end of one wire is connected to the power output pin Vout of the load detection chip 2, one end of the other wire is connected to the GND pin of the load detection chip 2 and the GND end of the remote power supply 4, and the other end of the safety cable 3 can be connected to a power supply interface of the commodity through a connector. When the safety cable 3 is connected to a commodity, as shown in fig. 1, a detection loop, that is, a voltage monitoring circuit, is formed between the power output pin Vout and GND, the voltage monitoring circuit is connected to a load and determines whether the commodity is in a safe state by monitoring whether the voltage on the load meets a threshold range, if so, the commodity is determined to be in a normal state, if not, the commodity is determined to be in a theft risk, and a safety signal is sent to the alarm module 1 through the state output pin Flag.
The detection principle of the load detection chip in the embodiment is to realize the judgment of the commodity safety state through the detection of current and voltage, and the specific implementation mode is to adopt a comparator, wherein the VN end of the comparator provides a fixed reference voltage which is generally temporarily set to VCC-300mV, and naturally can also be adjusted to other voltage values according to the actual situation, such as the value set to VCC-100 mV. The VP terminal of the comparator is used to connect the load. The VP end of the comparator divides voltage through a series resistor, then the sensor is connected, the series resistor is far away from one end of the VP end of the comparator, if the sensor does not detect a load commodity, the voltage of the VP end of the comparator is close to VCC, the voltage of the VP end of the comparator is higher than the voltage of the VN end, and the OUTP end of the comparator outputs high level, so that no-load access is judged. If the sensor at the end of the series resistor far away from the VP end of the comparator detects the commodity, the voltage received by the VP end of the comparator is lower than VCC-300mV at the VN end, and the OUTP end of the comparator outputs low level, so that the condition that the commodity is connected is judged, and the commodity is in a safe state.
Preferably, the load detection chip of the present invention may further include a protection module configured to perform over-current or over-voltage or short-circuit protection on the chip, and even the protection module may include a temperature protection module configured to perform over-temperature protection on the chip.
In this embodiment, the specific design of the load detection chip is as follows:
the load detection chip comprises a constant current source, a comparator, an amplifier, a selector, a change-over switch voltage follower, a logic device, a load detection circuit, a protection module, an MOS (metal oxide semiconductor) tube and the like.
The load detection chip is connected with a power supply circuit P1 with voltage reset at the VCC end, and is also connected with one input end of a selector S1, the selector S1 comprises the other input end as a selectable Vin end, and the output end of the selector S1 is used as a VDDA analog power supply. The output end of the selector S1 is connected with a constant current source A2, the current is 3 muA, the other end of the constant current source A2 is connected with a comparator CMP1, the other end is used as a switch detection pin, the constant current source A1 is also connected with the constant current source A1, the current of the constant current source A1 is 8mA, one end of the meter is connected with the input end, the other end of the meter is connected with a selector switch S2, and the other end of the selector switch S2 is connected with the comparator CMP 1. The adjustment of the current magnitude of the load detection chip can be realized by the selector S1.
The output terminal of the comparator CMP1 is connected to the Logic device Logic, which is also connected to the load detection circuit, the output terminal of the comparator CMP2, one input terminal of the comparator CMP2 is connected to VDDA-400mV, and the other input terminal is connected to the power supply output pin. The power supply output pin is also connected with a load detection circuit, a D pole of an MOS tube, a constant current source A3 (the current is 2 muA) and one input end of an amplifier, the other input end of the amplifier is Vin-100mV, the output end of the amplifier is connected with a protection circuit and a G pole of the MOS tube, and the access ends of an S pole of the MOS tube, the protection circuit and the constant current source A3 are connected with the power supply input end. The protection circuit comprises current-limiting protection, short-circuit protection and temperature overload protection, and the scheme is not specially described and only needs to adopt conventional circuit design.
The output end of the Logic device Logic is connected with an output enabling end of the conversion switch, the output enabling end is connected with one input end of the voltage follower U1, and the other input end and the output end of the voltage follower U1 are connected together to serve as a state output pin. One pin of the transfer switch S3 is connected to the GND pin, and the other pin is connected to the patch capacitor BC 1.
The working principle of the embodiment is as follows:
the power output pin Vout of the load detection chip 2 is connected with one wire in the safety cable, the GND pin of the load detection chip 2 is connected with the other wire in the safety cable to form two mutually isolated electric paths, and the safety cable can be connected to a charging port of a commodity through the charging interface so as to provide power for the commodity.
The remote power supply 4 is connected to the load detection chip 2 through a power input pin Vin of the load detection chip 2, a state output pin Flag of the load detection chip 2 is connected to the alarm module 1 and can input a safety signal to the alarm module 1 to control the working state (alarm or no alarm) of the alarm module 1, the alarm module 1 executes an alarm operation according to the detection result of the load detection chip 2, specifically, when the safety cable is disconnected, the load detection chip 2 judges whether the voltage on the load is in a threshold range through a voltage monitoring circuit, and then sends a warning signal (safety signal) to the alarm module 1 through the state output pin Flag to trigger the alarm module 1 to alarm.
Example 2, see figures 5-6.
In this embodiment, the load may be the sensing module 4, and the sensing module 4 may be attached or mounted to the article of merchandise to detect the security status of the article of merchandise.
As shown in fig. 5-6, the warning device includes an alarm module 1, a load detection chip 2, a safety cable 3 and a sensing module 4, the sensing module 4 is directly or indirectly connected to the commodity 5, for example, the sensing module 4 is a contact sensor and can be attached to a certain surface of the commodity 5, when the sensing module 4 is attached to the surface of the commodity, a detection circuit is connected, when the sensing module 4 is removed without authorization, the detection circuit is disconnected without authorization, the sensing module 4 itself can send a signal, the sensing module 4 itself can not send a signal, and the load detection chip 2 sends a safety signal through feedback of the detection circuit. It should be noted that, the improvement of the present invention focuses on the circuit design of the load chip, and the structure of the sensing module itself does not need to be changed, the sensing module 4 in the present invention can completely use the prior art touch sensor or current sensor, and the present invention aims to enable the prior art sensor to be directly connected to the load circuit for detection by improving the circuit design of the load chip.
The load detection chip 2 comprises a state output pin Flag, and the state output pin Flag is connected to the input end of the alarm module 1, so that a safety signal is sent to the alarm module 1 to indicate the alarm module 1 to send an alarm prompt. The load detection chip 2 further comprises a power input pin Vin, which is connected to an output terminal of a power supply 6, which may be a battery or other type of power supply module disposed inside the warning device. In some other ways, the power source may also be an external power source connected through an adapter. The load detection chip 2 further comprises a GND pin, and the GND pin is used for being connected with a GND end of a power supply and a GND end of an alarm device. The load detection chip 2 further comprises a switch detection pin S which can be connected to one input of the touch sensing module 4 via a safety cable, thereby completing the detection loop and powering the sensing module 4.
The safety cable 3 includes at least 2 wires electrically isolated from each other, one of which has one end connected to the switch detection pin S of the load detection chip 2 and the other end connected to one input terminal of the sensing module 4, and the other of which has one end connected to the GND pin of the load detection chip 2 and the GND terminal of the power supply and the other end connected to the other input terminal of the sensing module 4. Thus, when the sensing module 4 is connected to the commodity, the switch detection pin and the GND form a detection loop.
In some forms, the sensing module 4 may be provided with a switch, such as a contact switch, and whether the switch is turned on or off can control the detection loop to be closed or opened, for example, when the power storage switch is pressed, the detection loop is turned on, when the contact switch is flicked (for example, when the contact switch is not mounted to an article), the detection loop is turned off, in actual use, once the contact switch is pressed, that is, after the contact switch is mounted to the article, the detection loop is turned on, and then unless the contact switch is removed by authorization, the detection loop may be turned off to trigger the load detection chip to send out a safety signal.
The working principle of the embodiment is as follows:
the power output pin Vout of the load detection chip 2 is connected with a wire in the safety cable, the GND pin of the load detection chip 2 is connected with another wire in the safety cable, two mutually isolated electric paths are formed, two wires in the safety cable are respectively connected with two ends of the sensing module 4, the sensing module 4 is provided with an on-off switch, when the sensing module 4 is connected or mounted on a commodity, the on-off switch is switched on, so that the sensing module 4 forms a detection loop through the load detection chip 2 and the alarm module 1, and the detection loop is used for detecting whether the commodity is always connected with the sensing module 4.
The power supply 6 is connected to the load detection chip 2 through a power input pin Vin of the load detection chip 2 to provide power for the load detection chip 2 and the sensing module 4, a state output pin Flag of the load detection chip 2 is connected to the alarm module 1 and can input a safety signal to the alarm module 1 to control the working state (alarm or no alarm) of the alarm module 1, the alarm module 1 executes alarm operation according to the detection result of the load detection chip 2, specifically, when the safety cable is disconnected or the on-off switch on the sensing module 4 is disconnected, the load detection chip 2 judges that the voltage on the load disappears through the voltage monitoring circuit, and then sends a warning signal (safety signal) to the alarm module 1 through the state output pin Flag to trigger the alarm module 1 to alarm.
Other embodiments of this example are the same as example 1.
Example 3, see figures 7-8.
In this embodiment, the load may be a commodity, the load detection chip includes a power output pin Vout and a switch detection pin S, the safety cable includes three wires, one of the three wires is connected to the power output pin Vout of the load detection chip, the other is connected to the switch detection pin S of the load detection chip, and the third is connected to the GND pin of the load detection chip and the GND pin of the power supply and alarm module, so as to form a power supply and detection loop for the commodity.
Other embodiments of this example are the same as example 1.
Claims (10)
1. A load detection chip for commodity security, comprising:
a voltage control module configured to be able to provide a supply voltage to a load;
a voltage monitoring module configured to be able to monitor a voltage across a load;
and the output module is used for outputting a safety signal through the output module when the voltage exceeds a set threshold.
2. The load detection chip for merchandise security according to claim 1, wherein the load detection chip comprises a load detection circuit configured to enable a voltage value across the load.
3. The load detection chip for merchandise security according to claim 1, wherein the load detection chip is capable of being connected to a remote power source, wherein the remote power source provides power.
4. A load detection chip for merchandise security according to claim 1 or 3, wherein the load detection chip comprises at least one power input terminal configured to receive power input; when the power supply input end of the load chip exceeds one, the load detection chip is configured to be adjustable in input voltage.
5. The load detection chip for merchandise security according to claim 1, wherein the load detection chip is capable of connecting to a load through a security cable and providing power to the load.
6. The load detection chip for commodity security according to claim 1 or 5, wherein the load detection chip comprises at least one power output terminal configured to be directly or indirectly connected to a load and form a detection loop.
7. The load detection chip for merchandise security according to claim 1, wherein the load detection chip is capable of being connected to a sensing module via a security cable, the sensing module being configured to be capable of being used to detect whether merchandise is in a secure state.
8. The load detection chip for commodity security according to claim 1 or 7, wherein the load detection chip comprises at least one signal detection terminal configured to be directly or indirectly connected to the sensing module and form a detection loop.
9. The load detection chip for merchandise security of claim 1, wherein the output module is configured to be connectable to an alarm module, the alarm module configured to issue an alarm in response to the security signal.
10. The chip of claim 5 or 7, wherein the security cable comprises at least two isolated electrical wires, one of which is configured to be connected to the power output terminal or the signal detection terminal of the chip, and the other of which is configured to be connectable to the ground terminal of the chip and/or the power supply.
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