CN112067973B - Load detection chip for commodity security - Google Patents
Load detection chip for commodity security Download PDFInfo
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- CN112067973B CN112067973B CN202010830363.3A CN202010830363A CN112067973B CN 112067973 B CN112067973 B CN 112067973B CN 202010830363 A CN202010830363 A CN 202010830363A CN 112067973 B CN112067973 B CN 112067973B
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- 238000001514 detection method Methods 0.000 title claims abstract description 179
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 238000013461 design Methods 0.000 claims abstract description 11
- 230000004044 response Effects 0.000 claims abstract description 4
- 101100464782 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CMP2 gene Proteins 0.000 claims description 4
- 101100464779 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CNA1 gene Proteins 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 238000013475 authorization Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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Classifications
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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
- G08B13/2428—Tag details
- G08B13/2431—Tag circuit details
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 monitor a voltage value across a load; and an output module through which the load detection chip is configured to output a safety signal when the voltage value exceeds a set threshold. The invention designs a load detection chip which has the advantages of small size, light weight, high detection effect, stable operation, high reliability and high dynamic response, is used for confirming the safety state of the commodity by monitoring the voltage on the load, thereby ensuring the supervision and the protection of the commodity, realizing the switching of corresponding detection circuits, realizing the application under different scenes and improving the application range.
Description
Technical Field
The invention relates to the field of commodity theft prevention, in particular to a circuit design in a commodity theft prevention device.
Background
Commodity theft prevention is an industry which has developed with the development of society and technology, in the commodity theft prevention field, there are many sub-fields, for example, a security device for detecting whether a commodity is taken away from a place is arranged at an entrance of a supermarket or a sales place, which is generally EAS (also called an electronic commodity theft prevention system), and is one of commodity security measures widely adopted in the large retail industry at present, and the working principle of EAS is that a detector is arranged at an exit of the supermarket or a cashing channel, and the detector comprises a transmitter and a receiver, when the transmitter sends out a signal at a specific frequency, the signal is received by the receiver, and a monitoring area is generated, and the theft prevention mode is generally called retail theft prevention or area theft prevention.
The present invention relates to a device for preventing theft, and more particularly to a device for preventing theft, which is characterized in that the device is used for preventing theft, and the device is used for preventing theft and theft.
In the field of commodity theft prevention, the warning device is a device for providing warning effect for commodity theft prevention, and the most common effect of the warning device is to give out an alarm and/or prompt when the commodity is possibly at risk of being stolen, so as to remind staff in a place or to act as deterrent for people doing commodity theft. In the prior art in the field of commodity theft prevention, a relatively common warning device usually comprises an alarm and a signal lamp, a warning signal is sent out in an acousto-optic prompt mode, in the field of commodity theft prevention, the warning signal is a relatively common concept, but the warning signal in a narrow sense is a signal which plays a role in prompting or deterring, such as acousto-optic, and the like, the warning signal in a narrow sense usually comprises a safety signal, for example, a sensing signal sent out by a detection device (sensor) for detecting whether a commodity is in a safety state, the sensing signal usually needs to be transmitted, for example, a cable, infrared, bluetooth and the like, the sensing signal is transmitted to a corresponding device to trigger the warning signal in the narrow sense, and in view of the application scene, the transmission of the signal is obviously supported by electric power.
Besides, as mentioned above, many displayed commodities are usually electronic products, which have functions that can be realized by operation, and the commodities in the display place are "true machines" and require continuous power supply to maintain a continuous voyage state in the process of being continuously experienced, so besides detecting the states of the commodities, for example, the commodities are connected to the commodities through signal wires, power supply wires are often configured, in the prior art of the commodity anti-theft field, the most commonly used method is "three wires", namely, a signal wire is added in a common one-in one-out wire cable, and the signal wire is separately used for transmitting safety signals, so that the unification of power supply and monitoring of the commodities is achieved. The three-thread method is excellent in safety, can play a good role in theft prevention, and is very popular in the traditional commodity display theft prevention industry.
However, with the development of technology, the continuous update of commodities promotes the continuous development of the commodity anti-theft industry, after the commodities are displayed to become a sales mode accepted by more people, the demands of other aspects except security are more and more, for example, the traditional three wires need to be customized and cannot be directly used with common wires, so merchants who perform display sales need to independently configure the anti-theft cable (also called a safety cable, namely a cable capable of playing a certain role in commodity anti-theft or commodity security), moreover, the anti-theft cable is usually connected with commodities and anti-theft devices, and because the commodities are continuously in the experienced process, the cable naturally bends and twists along with the experience of the commodities, so that the cable is firm in quality, has very short service life, and the signal wires are particularly easy to damage, once the signal wires are damaged, even if the charged wires are still intact, the whole wire needs to be replaced, and for the increasingly popular commodity anti-theft industry, the merchants hope to reduce the expense on the anti-theft of the commodities to promote sales profits; in the prior art, an attempt is also made to detect by using a common charging cable, for example, whether the commodity is safe or not is judged according to the on-off state of current, and in theory, the detection can also be realized by using the common charging cable, for example, the common charging cable is used for connecting a circuit board, a sensor and an alarm in the commodity and the alarm device to form an alarm loop, the circuit board can detect whether current flows in the charging cable or the alarm loop, so as to judge whether the commodity is in a safe state, if the charging current always exists, the commodity is always connected with the alarm device and is in a safe state, and if the charging current disappears, the commodity possibly has a theft risk; in practice, this way of detecting by means of current needs to be implemented by means of a functional circuit consisting of a large number of electronic devices, which increases on the one hand the design complexity of the overall anti-theft system, resulting in a reduced stability, and on the other hand the cost of the solution increases, since a large number of devices require PCB space support, which would result in a larger overall device.
Disclosure of Invention
The invention aims to provide a load detection chip for commodity safety, which can be installed in a warning device for commodity safety, is provided with a load detection circuit, can supply power to commodities or form a detection loop with the commodities, 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 monitor a voltage value across a load;
and an output module through which the load detection chip is configured to output a safety signal 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 comprises a voltage control circuit, wherein a comparator or a selection circuit can be arranged in the voltage control circuit to realize voltage input with different magnitudes.
The load in the invention can refer to commodities which need to be protected by the commodity anti-theft system, and can also refer to other circuit elements which can be connected to the load detection chip, have a certain resistance value and need a certain working current, such as a sensor.
Further, the load detection chip is provided with a load detection circuit, the load detection circuit is configured to be capable of detecting a voltage value on a load, the load detection chip is also provided with a comparison and judgment circuit, the comparison and judgment circuit is capable of judging 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 usually in two conditions, the voltage value is too high or too low, if the voltage value is 0, the circuit is possibly disconnected, no current passes through the commodity, if the voltage value is 0, the commodity can be considered to be in an unsafe state, at the moment, the load detection chip can output a safe signal through an output module, if the voltage value on the load is too high, the circuit is possibly abnormal, for example, if the load is a sensor, and the too high voltage possibly damages components.
Further, the load detection chip can be connected to a remote power source, and the remote power source provides power, and in general, the voltage provided by the remote power source for the load detection chip meets the power supply requirement of a conventional electronic product.
Further, the load detection chip includes at least one power input configured to receive a power input; when the power input ends of the load chip are more than one, the load detection chip is configured to be adjustable in input voltage, for example, a plurality of power input ends are provided with a selection switch, when smaller voltage is required to be connected, 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 the safety cable and provide power for 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, commodity) through the safety cable, and the remote power supply can indirectly supply power to the commodity, at this time, the current passing through the safety cable becomes the detection object of the load detection chip, that is, in this state, the load detection chip forms a detection loop through the space between the safety cable and the commodity.
Further, the load detection chip comprises at least one power output terminal configured to be directly or indirectly connectable to one end of a load, the other end of the load being connected to a ground terminal, thereby forming a power supply loop, which is also a detection loop.
Further, the load detection chip can be connected to a sensor module through a safety cable, and the sensor module is configured to be used for detecting whether the commodity is in a safe state, which is another embodiment of the present invention, and in this embodiment, the load detection chip of the present invention can adjust the current level so as to be suitable for the operation of the sensor module.
Further, the load detection chip comprises at least one signal detection terminal configured to be directly or indirectly connectable to the sensing module and form a detection loop.
Further, the output module is configured to be connected to an alarm module, the alarm module is configured to send an alarm in response to a safety signal, the load detection chip of the present invention may be installed in an alarm device, and at the same time, the alarm module may be also installed in the alarm device, and the alarm module may be connected to the load detection chip, for responding to the load detection chip.
Further, the safety cable comprises at least two electrically conductive wires isolated from each other, one of which is configured for connection to a power output or signal detection terminal of the load detection chip and the other of which is configured for connection to a ground terminal of the load detection chip and/or the power supply, in such a way that a supply or detection loop is formed.
The beneficial effects of the invention are as follows:
(1) The invention designs a load detection chip which has the advantages of small size, light weight, high detection effect, stable work, high reliability and high dynamic response and is used for commodity safety. The invention can confirm the safety state of the commodity by monitoring the voltage on the load, thereby ensuring the supervision and protection of the commodity, and can realize the switching of the corresponding detection circuit so as to realize the application under different scenes and improve the application range.
(2) The invention designs a load detection chip which can be arranged in a warning device, a load detection circuit used for detecting whether a load in a circuit is normal or not is arranged on the load detection chip, 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 an alarm module in the warning device, goods can be electrically connected to the load detection chip through a safety cable, the load detection chip can receive a common power supply to supply power through the design of the load detection chip and the load detection circuit, the detection circuit can detect the common power supply without bearing a charging voltage, and therefore the safety cable can be used as an anti-theft cable for practical use on the premise of only having the function of switching on the circuit.
(3) The load detection chip can be connected with the sensing module, a detection loop between the load detection chip and the sensing module can be established through the sensing module which can be attached to the commodity, and the sensing module can be connected into a circuit like a common load, and the voltage of the connected load can be adjusted through the voltage control module, so that the load can be converted in time when different loads are connected, and the damage to the circuit and components caused by improper connection of the connected voltage of the loads with different rated voltages 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 the 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 the 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 the warning device according to embodiment 3 of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and specific examples. It should be noted that the embodiments are only specific to the present invention, and are 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 limiting the present invention, and all structures not described in detail are understood as being capable of being connected by conventional structures or circuits.
In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without collision. The description in this embodiment, if the directions or positional relationships indicated by "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "large", "small", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and are not to be construed as limitations of the present invention, but rather indicate or imply that the devices or elements referred to must have specific directions, be configured and operated in specific directions, and further, if the descriptions of the orders indicated by "first", "second", etc. are referred to, only for distinguishing between technical terms having the same or similar functions but different specific designs, and are not to be construed as having logical sequential relationships, nor are they to be construed as limitations of the present invention. The protection scope of the present invention shall be subject to the claims.
Example 1, refer to fig. 1-4.
As shown in fig. 1, the present invention provides a load detection chip for commodity security, comprising a voltage control module, a voltage monitoring module and an output module, wherein the voltage control module is configured to be capable of providing a supply voltage to a load; the voltage monitoring module is configured to monitor 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 comprises a voltage control circuit, wherein a comparator or a selection circuit can be arranged in the voltage control circuit to realize voltage input with different magnitudes.
The load in this embodiment mainly refers to a commodity that needs to be protected by a commodity anti-theft system, the load detection chip of the present invention is provided with a voltage monitoring circuit, the voltage monitoring circuit is configured to be capable of detecting a voltage value on the load, the load detection chip is also provided with a comparison and judgment circuit, the comparison and judgment circuit is capable of judging 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 usually in two cases, too high or too low, if the voltage value is 0, the circuit is likely to be disconnected, so that no current passes through the commodity, if the voltage value is 0, the commodity is considered to be in an unsafe state, at this time, the load detection chip can output a safety signal through the output module, if the voltage value on the load is too high, the circuit is likely to be abnormal, for example, if the load is a sensor, and the too high voltage may damage components.
The load detection chip of the invention can be placed in a warning device, the structure of the warning device carrying the load detection chip of the invention is shown in figure 2, and the warning device comprises a warning 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, where the status output pin Flag 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 out a safety signal, the safety signal may be output through the status output pin Flag and configured to be capable of outputting an operating state to the alarm module.
The load detection chip 2 further comprises a power input pin Vin, wherein the power input pin Vin can be connected with the 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 the GND end of the remote power supply 4. The load detection chip 2 comprises a power output pin Vout configured to directly or indirectly connect a security cable. The output of the remote power supply 4 is also connected to the power supply access of the alarm module 1.
The safety cable 3 includes at least 2 wires electrically isolated from each other, one end of one wire being connected to the power output pin Vout of the load detection chip 2, and the other end of the other wire being connected to the GND pin of the load detection chip 2 and the GND end of the remote power supply 4, the other end of the safety cable 3 being connectable 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, namely a voltage monitoring circuit is formed between the power output pin Vout and GND, the voltage monitoring circuit is connected to a load and judges whether the commodity is in a safe state by monitoring whether the voltage on the load accords with a threshold range, if so, the commodity is judged to be in a normal state, if not, the commodity is judged 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 is given a fixed reference voltage, which is generally set to be VCC-300mV temporarily, and can be naturally adjusted to other voltage values such as VCC-100mV according to actual implementation. The VP terminal of the comparator is used to connect the load. The VP end of the comparator is divided by the series resistor and then connected with the sensor, the series resistor is far away from one end of the VP end of the comparator, if the sensor does not detect 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, the OUTP end of the comparator outputs high level, and accordingly no load access is judged. If the sensor at one end of the series resistor far away from the VP end of the comparator detects commodity, the voltage received by the VP end of the comparator is lower than VCC-300mV at the VN end, the OUTP end of the comparator outputs low level, so that commodity access 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 protect the chip from overcurrent or overvoltage or short-circuit, and even the protection module may include a temperature protection module configured to protect the chip from overtemperature.
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 tube and the like.
The load detection chip is connected with a power 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 serving as a selectable Vin end, and the output end of the selector S1 serves 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 mu A, the other end of the constant current source A2 is connected with a comparator CMP1, the end is used as a switch detection pin, the constant current source A1 is also connected on 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 selection switch S2, and the other end of the selection switch S2 is connected with the comparator CMP 1. The selector S1 enables adjustment of the current level of the load detection chip.
The output end of the comparator CMP1 is connected with the Logic device Logic, the Logic device Logic is also connected with the load detection circuit and the output end of the comparator CMP2, one input end of the comparator CMP2 is connected with VDDA-400mV, and the other input end is connected with a power supply output pin. The power output pin is also connected with a load detection circuit, the D pole of the MOS tube, a constant current source A3 (current is 2 mu A) and one input end of the amplifier, the other input end of the amplifier is Vin-100mV, the output end of the amplifier is connected with a protection circuit and the G pole of the MOS tube, and the S pole of the MOS tube, the protection circuit and the access end of the constant current source A3 are connected with the power input end. The protection circuit comprises current limiting protection, short circuit protection and temperature overload protection, and the scheme is not specially described, and the protection circuit is designed by adopting a conventional circuit.
The output of Logic device Logic is connected to one output enable of the change-over switch, and this output enable is connected to one of the inputs of voltage follower U1, the other input of voltage follower U1 being connected to the output together as a state output pin. One pin of the change-over switch S3 is connected to the GND pin, and the other pin is connected to the chip 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, two mutually isolated electric paths are formed, and the safety cable can be connected to a charging port of a commodity through a charging interface, so that power is provided 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 with the alarm module 1 and can input a safety signal to the alarm module 1 for controlling the working state (alarm or not) 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, the load detection chip 2 judges whether the voltage on the load is in a threshold range through the voltage monitoring circuit, and then sends an alarm 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 fig. 5-6.
In this embodiment, the load may be a sensing module 4, and the sensing module 4 may be attached or mounted to the commodity to detect a security state of the commodity.
As shown in fig. 5 to 6, the warning device comprises an alarm module 1, a load detection chip 2, a safety cable 3 and a sensing module 4, wherein the sensing module 4 is directly or indirectly connected with a 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 loop is connected, when the sensing module 4 is detached without authorization, the detection loop is disconnected without authorization, the sensing module 4 can send out a signal, and the sensing module 4 can send out a safety signal without sending out a signal, and the load detection chip 2 sends out a safety signal through feedback of the detection circuit. It should be noted that, the improvement in the present invention is focused on the circuit design of the load chip, without changing the structure of the sensing module itself, and the sensing module 4 in the present invention can completely use the contact sensor or the current sensor in the prior art, and the purpose of the present invention is to enable the sensor in the prior art 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 which is connected to the input end of the alarm module 1, so as to send a safety signal to the alarm module 1 to instruct the alarm module 1 to send an alarm prompt. The load detection chip 2 further comprises a power input pin Vin connected to an output of a power supply 6, which may be a battery or other type of power supply module arranged 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 for connecting the GND end of the power supply and the GND end of the 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 switching on the detection loop and powering the sensing module 4.
The safety cable 3 includes at least 2 wires electrically isolated from each other, one end of one wire being connected to the switch detection pin S of the load detection chip 2 and the other end being connected to one input terminal of the sensing module 4, and one end of the other wire being connected to the GND pin of the load detection chip 2 and the GND terminal of the power supply, and the other end being 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 forms a detection loop with GND.
In some ways, a switch, such as a contact switch, may be provided on the sensing module 4, the opening or non-opening of which switch is capable of controlling the detection loop to be closed or opened, for example, when the power storage switch is depressed, the detection loop is closed when the contact switch is sprung open (e.g. not mounted to a commodity), in actual use, the detection loop is closed once the contact switch is depressed, i.e. mounted to a commodity, and then unless removed by authorization, the load detection chip may be triggered to issue a security signal once the detection loop is opened.
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, the 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 to a commodity, the on-off switch is turned on, 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, provides 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 with the alarm module 1 and can input a safety signal to the alarm module 1 so as to control the working state (alarm or non-alarm) of the alarm module 1, and 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 an 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 sends an alarm 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 fig. 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 at the same time, one of which 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 pins of the power supply and alarm module, and forms a power supply and detection loop for the commodity.
Other embodiments of this example are the same as example 1.
Claims (9)
1. 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 monitor a voltage across a load;
and an output module, the load detection chip configured to output a safety signal through the output module when the voltage exceeds a set threshold;
the load detection chip comprises a load detection circuit configured to enable a voltage value across a load;
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 and an MOS tube;
the load detection chip is connected with a power 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 serving as a selectable Vin end, and the output end of the selector S1 serves as a VDDA analog power supply; the output end of the selector S1 is connected with a constant current source A2, the other end of the constant current source A2 is connected with a comparator CMP1, the end is used as a switch detection pin, the constant current source A1 is also connected on the constant current source A1, one end of the constant current source A1 is connected with an input end, the other end of the constant current source A1 is connected with a selection switch S2, and the other end of the selection switch S2 is connected with the comparator CMP 1; the selector S1 can be used for adjusting the current of the load detection chip;
the output end of the comparator CMP1 is connected with a Logic device Logic, the Logic device Logic is also connected with a load detection circuit and the output end of the comparator CMP2, one input end of the comparator CMP2 is connected with VDDA-400mV, and the other input end is connected with a power supply output pin; the power output pin is also connected with a load detection circuit, a D pole of an MOS tube, a constant current source A3 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 S pole of the MOS tube, the protection circuit and an access end of the constant current source A3 are connected with the power input end;
the output end of the Logic device Logic is connected with one output enabling end of the change-over switch, the output enabling end is connected with one input end of the voltage follower U1, and the other input end of the voltage follower U1 is connected with the output end to be used as a state output pin; one pin of the change-over switch S3 is connected to the GND pin, and the other pin is connected to the chip capacitor BC 1.
2. The load detection chip for merchandise security according to claim 1, wherein said load detection chip is connectable to a remote power source, powered by the remote power source.
3. A load detection chip for merchandise security according to claim 1 or 2, wherein the load detection chip comprises at least one power input configured for receiving a power input; when the power supply input ends of the load chip are more than one, the load detection chip is configured to be adjustable in input voltage.
4. The load detection chip for merchandise security according to claim 1, wherein the load detection chip is capable of being connected to a load via a security cable and providing power to the load.
5. A load detection chip for merchandise security according to claim 1 or 4, wherein the load detection chip comprises at least one power output configured to be directly or indirectly connectable to a load and form a detection loop.
6. The load detection chip for merchandise security according to claim 1, wherein the load detection chip is connectable by a security cable to a sensing module configured to be operable to detect whether merchandise is in a secure state.
7. A load detection chip for merchandise security according to claim 1 or 6, wherein the load detection chip comprises at least one signal detection terminal configured to be directly or indirectly connectable to a sensing module and form a detection loop.
8. The load detection chip for merchandise security according to claim 1, wherein said output module is configured to be connectable to an alarm module, said alarm module being configured to issue an alarm in response to a security signal.
9. A load sensing chip for merchandise security according to claim 4 or 6, wherein the security cable comprises at least two electrically conductive wires isolated from each other, one of which is configured for connection to a power output or signal sensing terminal of the load sensing chip and the other of which is configured for connection to a ground terminal of the load sensing chip and/or power supply.
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Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208820471U (en) * | 2018-10-11 | 2019-05-03 | 杭州朗鸿科技股份有限公司 | A kind of multiple voltage supply system for commodity anti-theft |
| CN110009843A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | It is a kind of to interact warning system for commercial articles safety |
| CN110007621A (en) * | 2018-12-07 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of touching formula control system, control device and monitoring device for commercial articles safety |
| CN110009852A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of monitoring device for commercial articles safety |
| CN110009851A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of warning system for commercial articles safety |
| CN110009845A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of warning system for commercial articles safety |
| CN209149508U (en) * | 2018-12-09 | 2019-07-23 | 杭州朗泽安防技术有限公司 | A kind of monitoring device for commercial articles safety |
| CN209591018U (en) * | 2018-12-20 | 2019-11-05 | 杭州朗泽安防技术有限公司 | A kind of sensing device for commercial articles safety |
| CN110517431A (en) * | 2019-08-01 | 2019-11-29 | 杭州朗鸿科技股份有限公司 | A kind of wireless monitoring device for commodity anti-theft |
| CN210039007U (en) * | 2018-10-11 | 2020-02-07 | 杭州朗鸿科技股份有限公司 | Alarm for commodity anti-theft and powered by sensor |
| CN210466627U (en) * | 2019-08-16 | 2020-05-05 | 杭州朗鸿智联科技有限公司 | Safety device for commodity anti-theft |
| CN210466622U (en) * | 2018-10-26 | 2020-05-05 | 杭州朗鸿科创科技有限公司 | Anti-theft device for commodity anti-theft |
| CN210667080U (en) * | 2019-10-18 | 2020-06-02 | 杭州朗鸿智联科技有限公司 | Anti-theft device and base for commodity display |
| CN111462434A (en) * | 2020-03-25 | 2020-07-28 | 杭州朗鸿科创科技有限公司 | Commodity safety system based on optical signal |
| CN112071010A (en) * | 2020-08-18 | 2020-12-11 | 杭州朗鸿科创科技有限公司 | Load detection chip for commodity safety |
| CN213399876U (en) * | 2020-08-18 | 2021-06-08 | 杭州朗鸿科创科技有限公司 | Warning device for commodity safety |
| CN213399875U (en) * | 2020-08-18 | 2021-06-08 | 杭州朗鸿科创科技有限公司 | Warning device for commodity safety |
| CN213399877U (en) * | 2020-08-18 | 2021-06-08 | 杭州朗鸿科创科技有限公司 | Detection chip for commodity safety |
| CN213781140U (en) * | 2020-08-18 | 2021-07-23 | 杭州朗鸿科创科技有限公司 | Warning device for commodity safety |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016210069A1 (en) * | 2015-06-25 | 2016-12-29 | Invue Security Products Inc. | Wireless merchandise security system |
| US10916112B2 (en) * | 2018-10-11 | 2021-02-09 | Hangzhou Langhong Kechuang Technology Co., Ltd. | Multi-voltage power supply system for merchandise security |
| US11217075B2 (en) * | 2018-11-27 | 2022-01-04 | Hangzhou Langhong Technology Co., Ltd | Interactive warning system and warning device for merchandise security |
-
2020
- 2020-08-18 CN CN202010830363.3A patent/CN112067973B/en active Active
Patent Citations (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208820471U (en) * | 2018-10-11 | 2019-05-03 | 杭州朗鸿科技股份有限公司 | A kind of multiple voltage supply system for commodity anti-theft |
| CN210039007U (en) * | 2018-10-11 | 2020-02-07 | 杭州朗鸿科技股份有限公司 | Alarm for commodity anti-theft and powered by sensor |
| CN210466622U (en) * | 2018-10-26 | 2020-05-05 | 杭州朗鸿科创科技有限公司 | Anti-theft device for commodity anti-theft |
| CN110009843A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | It is a kind of to interact warning system for commercial articles safety |
| CN110009852A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of monitoring device for commercial articles safety |
| CN110009851A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of warning system for commercial articles safety |
| CN110009845A (en) * | 2018-11-27 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of warning system for commercial articles safety |
| CN110007621A (en) * | 2018-12-07 | 2019-07-12 | 杭州朗泽安防技术有限公司 | A kind of touching formula control system, control device and monitoring device for commercial articles safety |
| CN209149508U (en) * | 2018-12-09 | 2019-07-23 | 杭州朗泽安防技术有限公司 | A kind of monitoring device for commercial articles safety |
| CN209591018U (en) * | 2018-12-20 | 2019-11-05 | 杭州朗泽安防技术有限公司 | A kind of sensing device for commercial articles safety |
| CN110517431A (en) * | 2019-08-01 | 2019-11-29 | 杭州朗鸿科技股份有限公司 | A kind of wireless monitoring device for commodity anti-theft |
| CN210466627U (en) * | 2019-08-16 | 2020-05-05 | 杭州朗鸿智联科技有限公司 | Safety device for commodity anti-theft |
| CN210667080U (en) * | 2019-10-18 | 2020-06-02 | 杭州朗鸿智联科技有限公司 | Anti-theft device and base for commodity display |
| CN111462434A (en) * | 2020-03-25 | 2020-07-28 | 杭州朗鸿科创科技有限公司 | Commodity safety system based on optical signal |
| CN112071010A (en) * | 2020-08-18 | 2020-12-11 | 杭州朗鸿科创科技有限公司 | Load detection chip for commodity safety |
| CN213399876U (en) * | 2020-08-18 | 2021-06-08 | 杭州朗鸿科创科技有限公司 | Warning device for commodity safety |
| CN213399875U (en) * | 2020-08-18 | 2021-06-08 | 杭州朗鸿科创科技有限公司 | Warning device for commodity safety |
| CN213399877U (en) * | 2020-08-18 | 2021-06-08 | 杭州朗鸿科创科技有限公司 | Detection chip for commodity safety |
| CN213781140U (en) * | 2020-08-18 | 2021-07-23 | 杭州朗鸿科创科技有限公司 | Warning device for commodity safety |
Non-Patent Citations (1)
| Title |
|---|
| 陈凯良等.恒流源及其应用电路.浙江科学技术出版社,1992,4. * |
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