CN113140090A - Power adapter system for commodity theft prevention - Google Patents
Power adapter system for commodity theft prevention Download PDFInfo
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- CN113140090A CN113140090A CN202110442252.XA CN202110442252A CN113140090A CN 113140090 A CN113140090 A CN 113140090A CN 202110442252 A CN202110442252 A CN 202110442252A CN 113140090 A CN113140090 A CN 113140090A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
Abstract
The embodiment of the invention discloses a power adapter system for commodity theft prevention, which comprises: the sensor device is connected with the displayed commodity and used for receiving the first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity; the power adapter is connected with the sensor device and used for converting the external voltage into the first voltage according to the feedback signal; and the alarm is connected with the sensor device and used for working according to the third voltage, and when the sensor device is disconnected from the display commodity or the sensor device is disconnected from the power adapter, the alarm gives an alarm. According to the embodiment of the invention, the alarm and the commodity are powered by the sensor and the feedback signal is generated to adjust the voltage of the power adapter, so that the phenomenon of power failure or no charging of the commodity in the display process in the prior art is solved, and the effects of stable charging of the commodity and theft alarm are realized.
Description
Technical Field
The embodiment of the invention relates to the technology of power adapters, in particular to a power adapter system for preventing commodities from being stolen.
Background
In recent years, burglar alarms have been widely used in shopping malls to show theft prevention of digital goods, during the process of showing the digital goods, the displayed digital goods are connected with an alarm through a burglar alarm charging sensing wire, a power wire of the burglar alarm is connected with an adapter, and after the displayed goods and the alarm are connected through a burglar alarm wire, the burglar alarm enters a defense state and charges the goods (the charging wire of the burglar alarm is connected with the adapter). When the anti-theft alarm enters a defense state, if the digital commodity is taken away (the anti-theft alarm line is pulled out), the anti-theft alarm gives an alarm sound.
However, in the current general anti-theft alarm, the alarm host computer commodity is generally directly connected by adopting an alarm charging sensing wire, the power consumption is increased in the display process along with the upgrading and updating of the digital commodity, the adapter provided for the anti-theft device is more and more strict (for example, high-power charging, quick charging, different voltages during charging and the like are required), and the existing anti-theft adapter cannot meet the requirement, so that the power failure phenomenon of the digital commodity is caused in the display process.
Disclosure of Invention
The invention provides a power adapter system for commodity theft prevention, which aims to realize the effects of stable commodity charging and theft alarm and improve the user experience.
The embodiment of the invention provides a power adapter system for commodity theft prevention, which comprises:
the sensor device is connected with the displayed commodity and used for receiving the first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity;
the power adapter is connected with the sensor device and used for converting the external voltage into the first voltage according to the feedback signal;
and the alarm is connected with the sensor device and used for working according to the third voltage, and when the sensor device is disconnected from the display commodity or the sensor device is disconnected from the power adapter, the alarm gives an alarm.
Optionally, the sensor device includes a TO ADAPTR terminal, a TO PC terminal, and a TO ALARM terminal, the TO ADAPTR terminal is used for connecting the power adapter, the TO PC terminal is used for connecting the display commodity, and the TO ALARM terminal is used for connecting the ALARM.
Optionally, the sensor device further includes a conversion circuit, and the conversion circuit is configured to generate a third voltage to supply power to the alarm.
Optionally, the conversion circuit includes a chip U1, and the chip U1 is a power conversion chip, and is configured to output a third voltage to the alarm according to the feedback signal.
Optionally, the conversion circuit includes a filter circuit, and the filter circuit includes: voltage terminal VCC _ IN, electric capacity C1 and electric capacity C2, the first end of electric capacity C1 is connected to voltage terminal VCC _ IN, electric capacity C1's second end ground, electric capacity C2's first end is connected to voltage terminal VCC _ IN, electric capacity C2's second end ground, voltage terminal VCC _ IN is connected to chip U1's 2 nd pin.
Optionally, the converting circuit further includes a switch circuit, the switch circuit includes a resistor R1, a first terminal of the resistor R1 is connected to the voltage terminal VCC _ IN, and a second terminal of the resistor R1 is connected to the 7 th pin of the chip U1.
Optionally, the conversion circuit further includes a power supply circuit, the power supply circuit includes an inductor L1, a capacitor C3, a capacitor C7, a capacitor C8, and a voltage terminal VBUS, a first terminal of the capacitor C3 is connected to the 1 st pin of the chip U1, a second terminal of the capacitor C3 is connected to the first terminal of the inductor L1, a second terminal of the inductor L1 is connected to the first terminal of the capacitor C7, a second terminal of the capacitor C7 is grounded, a first terminal of the capacitor C8 is connected to the voltage terminal VBUS, and a second terminal of the capacitor C8 is grounded.
Optionally, the conversion circuit further includes a feedback circuit, the feedback circuit includes a resistor R2 and a resistor R3, a first terminal of the resistor R2 is connected to the voltage terminal VBUS, a second terminal of the resistor R2 is connected to a first terminal of the resistor R3, a second terminal of the resistor R3 is grounded, and a first terminal of the resistor R3 is connected to the 5 th pin of the chip U1.
Optionally, the conversion circuit further includes an auxiliary circuit, the auxiliary circuit includes a capacitor C4, a resistor R4, and a capacitor C5, a first end of the capacitor C4 is connected to the 6 th pin of the chip U1, a second end of the capacitor C4 is connected to a first end of the resistor R4, a second end of the resistor R4 is grounded, a first end of the capacitor C5 is connected to the 6 th pin of the chip U1, and a second end of the capacitor C5 is grounded.
Optionally, the auxiliary circuit further includes a capacitor C6, a first terminal of the capacitor C6 is connected to the 8 th pin of the chip U1, and a second terminal of the capacitor C6 is grounded.
The embodiment of the invention discloses a power adapter system for commodity theft prevention, which comprises: the sensor device is connected with the displayed commodity and used for receiving the first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity; the power adapter is connected with the sensor device and used for converting the external voltage into a first voltage according to the feedback signal; and the alarm is connected with the sensor device and used for working according to the third voltage, and when the sensor device is disconnected from the display commodity or the sensor device is disconnected from the power adapter, the alarm gives an alarm. According to the embodiment of the invention, the alarm and the commodity are powered by the sensor and the feedback signal is generated to adjust the voltage of the power adapter, so that the phenomenon of power failure or no charging of the commodity in the display process in the prior art is solved, and the effects of stable charging of the commodity and theft alarm are realized.
Drawings
Fig. 1 is a schematic diagram of a power adapter system module for preventing theft of an article according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a port connection of a sensor according to a first embodiment of the present invention;
FIG. 3 is a circuit diagram of an interface of an alarm according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a conversion circuit according to a second embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. A process may be terminated when its operations are completed, but may have additional steps not included in the figure. A process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc.
Furthermore, the terms "first," "second," and the like may be used herein to describe various orientations, actions, steps, elements, or the like, but the orientations, actions, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, a first module may be termed a second module, and, similarly, a second module may be termed a first module, without departing from the scope of the present application. The first module and the second module are both modules, but they are not the same module. The terms "first", "second", etc. are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Example one
Fig. 1 is a schematic diagram of a power adapter system module for preventing theft of a commodity according to an embodiment of the present invention, where the power adapter system for preventing theft of a commodity according to the embodiment of the present invention is suitable for a case where a user charges a displayed commodity, and specifically, the power adapter system for preventing theft of a commodity according to an embodiment of the present invention includes: sensor device 1, power adapter 2 and alarm 3.
The sensor device 1 is connected with the displayed commodity 4 and is used for receiving a first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity 4.
In this embodiment, the exhibited merchandise 4 is generally an electronic device such as a mobile phone, a tablet computer, and the like, and is generally used for user exhibition in a monopoly store or a shopping mall. The sensor device 1 comprises a TO ADAPTR end, a TO PC end and a TO ALARM end, wherein the TO ADAPTR end is used for being connected with the power adapter 2, the TO PC end is used for being connected with the display commodity 4, and the TO ALARM end is used for being connected with the ALARM 3. The first voltage is generated by the power adapter 2, the power adapter 2 supplies electric energy to the commodity through the sensor device 1 through a cable, and after the adapter communicates with the commodity, the adapter generates a second voltage (such as voltage, current and the like) with required power required by the commodity, so that the commodity is ensured to be charged normally in the display process. A third voltage is supplied to the alarm 3 to cause the alarm 3 to enter a armed state, giving an alarm when an abnormal condition is encountered. The sensor device 1 further comprises a switching circuit for generating a third voltage for supplying the alarm 3. When the sensor device 1 is connected to the commodity power adapter 2 and then connected to the alarm 3, a direct-current power supply generated by a DC-DC conversion circuit in the sensor supplies power to the alarm 3, and electric energy required by the alarm 3 is guaranteed. The feedback signal is used for adaptively adjusting the first voltage output by the power adapter 2 according to the parameters of the currently displayed commodity 4 and the like, and specifically, the feedback signal is generated by the sensor device 1 and returned to the power adapter 2 to adjust the first voltage to meet the voltage and power requirements of the displayed commodity 4.
The power adapter 2 is connected to the sensor device 1, and is configured to convert an external voltage into the first voltage according to the feedback signal.
In this embodiment, the power adapter 2 is a power supply conversion device for small portable electronic devices and electronic appliances, and generally comprises a housing, a transformer, an inductor, a capacitor, a control IC, a PCB board, and other components, and its operating principle is to convert ac input into dc output. In the present embodiment, the power adapter 2 is connected to an external power source to convert an external voltage into a first voltage to be supplied to the sensor device 1.
And the alarm 3 is connected with the sensor device 1 and used for working according to the third voltage, and when the sensor device 1 is disconnected with the display commodity 4 or the sensor device 1 is disconnected with the power adapter 2, the alarm 3 gives an alarm.
In this embodiment, fig. 2 is a circuit diagram of a port connection of the sensor device 1 in this embodiment, fig. 3 is a circuit diagram of an interface connection of the alarm 3 in this embodiment, when the alarm 3 is connected to the sensor and then connected to the commercial power adapter 2, a sensing loop of the alarm 3 is closed (on the adapter side) and enters a defense configuration, and when the sensing loop is disconnected due to some reason (such as human factor), an alarm is generated. When the TO ADAPTR end of the sensor is connected TO an adapter of a commodity and the TO ALARM end is connected TO the ALARM 3, the TC end (T2) of the adapter end is connected TO the end (T2) of the ALARM 3 TO form a defense loop with the ground and enter a defense state, and when the defense loop is disconnected due TO some reason (such as the adapter end is pulled out or the ALARM 3 is pulled out artificially), the ALARM 3 gives an ALARM. When the alarm 3 is connected to the sensor and then connected with the displayed commodity, the sensing loop of the alarm 3 is closed (the side of the displayed commodity 4) and enters a defense state, and when the sensing loop is disconnected due to some reason (such as human factors), an alarm is generated. When the TO PC end of the sensor is connected TO the display commodity 4 and the TO ALARM end is connected TO the ALARM 3, the TP end (T1) of the adapter end is connected TO the ALARM 3 end (T1) TO form a defense loop with the ground and enter a defense state, and when the defense loop is disconnected due TO some reason (such as artificial pulling out of the display commodity 4 or the ALARM 3), the ALARM 3 gives an ALARM.
The embodiment of the invention discloses a power adapter system for commodity theft prevention, which comprises: the sensor device is connected with the displayed commodity and used for receiving the first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity; the power adapter is connected with the sensor device and used for converting the external voltage into a first voltage according to the feedback signal; and the alarm is connected with the sensor device and used for working according to the third voltage, and when the sensor device is disconnected from the display commodity or the sensor device is disconnected from the power adapter, the alarm gives an alarm. According to the embodiment of the invention, the alarm and the commodity are powered by the sensor and the feedback signal is generated to adjust the voltage of the power adapter, so that the phenomenon of power failure or no charging of the commodity in the display process in the prior art is solved, and the effects of stable charging of the commodity and theft alarm are realized.
Example two
The present embodiment is expanded on the basis of the first embodiment, and the power adapter 2 system for preventing theft of a commodity provided in the embodiment of the present invention is suitable for a case where a user charges a displayed commodity 4, and specifically, the power adapter 2 system for preventing theft of a commodity provided in the first embodiment of the present invention includes: sensor device 1, power adapter 2 and alarm 3.
The sensor device 1 is connected with the displayed commodity 4 and is used for receiving a first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity 4.
In this embodiment, the exhibited merchandise 4 is generally an electronic device such as a mobile phone, a tablet computer, and the like, and is generally used for user exhibition in a monopoly store or a shopping mall. The sensor device 1 comprises a TO ADAPTR end, a TO PC end and a TO ALARM end, wherein the TO ADAPTR end is used for being connected with the power adapter 2, the TO PC end is used for being connected with the display commodity 4, and the TO ALARM end is used for being connected with the ALARM 3. The first voltage is generated by the power adapter 2, the power adapter 2 supplies electric energy to the commodity through the sensor device 1 through a cable, and after the adapter communicates with the commodity, the adapter generates a second voltage (such as voltage, current and the like) with required power required by the commodity, so that the commodity is ensured to be charged normally in the display process. A third voltage is supplied to the alarm 3 to cause the alarm 3 to enter a armed state, giving an alarm when an abnormal condition is encountered. The sensor device 1 further comprises a switching circuit for generating a third voltage for supplying the alarm 3. When the sensor device 1 is connected to the commodity power adapter 2 and then connected to the alarm 3, a direct-current power supply generated by a DC-DC conversion circuit in the sensor supplies power to the alarm 3, and electric energy required by the alarm 3 is guaranteed. The feedback signal is used for adaptively adjusting the first voltage output by the power adapter 2 according to the parameters of the currently displayed commodity 4 and the like, and specifically, the feedback signal is generated by the sensor device 1 and returned to the power adapter 2 to adjust the first voltage to meet the voltage and power requirements of the displayed commodity 4.
Referring to fig. 4, fig. 4 is a circuit diagram of a conversion circuit in the present embodiment, the conversion circuit includes a chip U1, and the chip U1 is a power conversion chip, and is configured to output a third voltage to the alarm 3 according to the feedback signal.
The conversion circuit includes a filter circuit 11, and the filter circuit 11 includes: voltage terminal VCC _ IN, electric capacity C1 and electric capacity C2, the first end of electric capacity C1 is connected to voltage terminal VCC _ IN, electric capacity C1's second end ground, electric capacity C2's first end is connected to voltage terminal VCC _ IN, electric capacity C2's second end ground, voltage terminal VCC _ IN is connected to chip U1's 2 nd pin.
IN this embodiment, when the TO ADAPTR terminal of the sensor is connected TO an adapter of a commercial product and the TO PC terminal is connected TO the display commercial product 4, the generated VCC _ IN voltage is filtered IN parallel by the C1 and the C2 (one end of the C1 and the C2 is connected TO the VCC _ IN terminal, and the other end is grounded) and then is added TO the PIN2 of the power input terminal of the power conversion chip (U1). The filter circuit 11 is mainly used for filtering the circuit and providing a normal operating voltage for the chip U1.
The conversion circuit further comprises a switch circuit 12, the switch circuit 12 comprises a resistor R1, a first terminal of the resistor R1 is connected to the voltage terminal VCC _ IN, and a second terminal of the resistor R1 is connected to the 7 th pin of the chip U1.
IN the present embodiment, the voltage of VCC _ IN is applied to PIN7 of the switch control terminal of the power conversion chip (U1) via R1, and a switching signal is given to the power conversion chip (U1). The switching circuit 12 is mainly used to control whether the chip U1 works normally or not, and is used to start the sensor device 1.
The conversion circuit further comprises a power supply circuit 13, wherein the power supply circuit 13 comprises an inductor L1, a capacitor C3, a capacitor C7, a capacitor C8 and a voltage terminal VBUS, a first end of the capacitor C3 is connected to the 1 st pin of the chip U1, a second end of the capacitor C3 is connected to the first end of the inductor L1, a second end of the inductor L1 is connected to the first end of the capacitor C7, a second end of the capacitor C7 is grounded, a first end of the capacitor C8 is connected to the voltage terminal VBUS, and a second end of the capacitor C8 is grounded.
IN this embodiment, the VCC _ IN power source outputs VBUS power under the action of a switching signal through a switching conversion circuit formed by an internal circuit of a power conversion chip (U1) and L1, and VBUS is connected TO a TO ALARM (terminal 3 of ALARM) after being filtered IN parallel through C7 and C8 (one end of C7 and C8 is connected TO the VBUS terminal, and the other end is grounded) TO provide power for ALARM 3. The power supply circuit 13 supplies power to the alarm 3 through the converted direct-current voltage, so that the normal use of the alarm 3 is ensured.
The conversion circuit further comprises a feedback circuit 14, the feedback circuit 14 comprises a resistor R2 and a resistor R3, a first end of the resistor R2 is connected to the voltage terminal VBUS, a second end of the resistor R2 is connected to a first end of the resistor R3, a second end of the resistor R3 is grounded, and a first end of the resistor R3 is connected to the 5 th pin of the chip U1.
In this embodiment, the VBUS voltage is stabilized (e.g., 5V) by providing a feedback signal to the PIN5 of the power conversion chip (U1) through a serial voltage divider circuit formed by R2 and R3. The feedback circuit 14 is mainly used for providing a feedback signal to the power adapter 2 to ensure that the power adapter 2 performs adaptive adjustment, so as to ensure that the displayed merchandise 4 is normally powered.
The conversion circuit further comprises an auxiliary circuit 15, wherein the auxiliary circuit 15 comprises a capacitor C4, a resistor R4 and a capacitor C5, a first end of the capacitor C4 is connected to the 6 th pin of the chip U1, a second end of the capacitor C4 is connected to a first end of the resistor R4, a second end of the resistor R4 is grounded, a first end of the capacitor C5 is connected to the 6 th pin of the chip U1, and a second end of the capacitor C5 is grounded. The auxiliary circuit 15 further includes a capacitor C6, a first terminal of the capacitor C6 is connected to the 8 th pin of the chip U1, and a second terminal of the capacitor C6 is grounded.
In the embodiment, the R4 is connected in series with the C4 and then connected in parallel with the C5, one end of the R4 is grounded, and the other end of the R4 is connected to the PIN6 of the power conversion chip (U1), and this part of the circuit is connected to the auxiliary circuit 15 formed by the C6 circuit connected to the PIN8, so as to ensure the normal operation of the power conversion chip (U1).
The power adapter 2 is connected to the sensor device 1, and is configured to convert an external voltage into a first voltage according to the feedback signal.
In this embodiment, the power adapter 2 is a power supply conversion device for small portable electronic devices and electronic appliances, and generally comprises a housing, a transformer, an inductor, a capacitor, a control IC, a PCB board, and other components, and its operating principle is to convert ac input into dc output. In the present embodiment, the power adapter 2 is connected to an external power source to convert an external voltage into a first voltage to be supplied to the sensor device 1.
And the alarm 3 is connected with the sensor device 1 and used for working according to the third voltage, and when the sensor device 1 is disconnected with the display commodity 4 or the sensor device 1 is disconnected with the power adapter 2, the alarm 3 gives an alarm.
In this embodiment, when the alarm 3 is connected to the sensor and then connected to the commercial power adapter 2, the sensing loop of the alarm 3 is closed (on the adapter side) and enters the armed state, and when the sensing loop is disconnected due to some reason (e.g., human factor), an alarm is generated. When the TO ADAPTR end of the sensor is connected TO an adapter of a commodity and the TO ALARM end is connected TO the ALARM 3, the TC end (T2) of the adapter end is connected TO the end (T2) of the ALARM 3 TO form a defense loop with the ground and enter a defense state, and when the defense loop is disconnected due TO some reason (such as the adapter end is pulled out or the ALARM 3 is pulled out artificially), the ALARM 3 gives an ALARM. When the alarm 3 is connected to the sensor and then connected with the displayed commodity, the sensing loop of the alarm 3 is closed (the side of the displayed commodity 4) and enters a defense state, and when the sensing loop is disconnected due to some reason (such as human factors), an alarm is generated. When the TO PC end of the sensor is connected TO the display commodity 4 and the TO ALARM end is connected TO the ALARM 3, the TP end (T1) of the adapter end is connected TO the ALARM 3 end (T1) TO form a defense loop with the ground and enter a defense state, and when the defense loop is disconnected due TO some reason (such as artificial pulling out of the display commodity 4 or the ALARM 3), the ALARM 3 gives an ALARM.
The embodiment of the invention discloses a power adapter system for commodity theft prevention, which comprises: the sensor device is connected with the displayed commodity and used for receiving the first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity; the power adapter is connected with the sensor device and used for converting the external voltage into a first voltage according to the feedback signal; and the alarm is connected with the sensor device and used for working according to the third voltage, and when the sensor device is disconnected from the display commodity or the sensor device is disconnected from the power adapter, the alarm gives an alarm. According to the embodiment of the invention, the alarm and the commodity are powered by the sensor and the feedback signal is generated to adjust the voltage of the power adapter, so that the phenomenon of power failure or no charging of the commodity in the display process in the prior art is solved, and the effects of stable charging of the commodity and theft alarm are realized.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A power adapter system for merchandise theft protection, comprising:
the sensor device is connected with the displayed commodity and used for receiving the first voltage, converting the first voltage into a second voltage and a third voltage and generating a feedback signal, wherein the second voltage is used for being provided for the displayed commodity;
the power adapter is connected with the sensor device and used for converting the external voltage into the first voltage according to the feedback signal;
and the alarm is connected with the sensor device and used for working according to the third voltage, and when the sensor device is disconnected from the display commodity or the sensor device is disconnected from the power adapter, the alarm gives an alarm.
2. The power adapter system for merchandise theft prevention as described in claim 1, wherein said sensor means comprises a TO ADAPTR terminal for connecting said power adapter, a TO PC terminal for connecting said merchandise display and a TO ALARM terminal for connecting said ALARM.
3. The power adapter system for merchandise theft prevention according to claim 1, wherein said sensor device further comprises a switching circuit for generating a third voltage to power said alarm.
4. The power adapter system of claim 3, wherein the switching circuit comprises a chip U1, and the chip U1 is a power switching chip for outputting a third voltage to the alarm according to the feedback signal.
5. The power adapter system for merchandise theft prevention according to claim 4, wherein said conversion circuit comprises a filter circuit comprising: voltage terminal VCC _ IN, electric capacity C1 and electric capacity C2, the first end of electric capacity C1 is connected to voltage terminal VCC _ IN, electric capacity C1's second end ground, electric capacity C2's first end is connected to voltage terminal VCC _ IN, electric capacity C2's second end ground, voltage terminal VCC _ IN is connected to chip U1's 2 nd pin.
6. The power adapter system according to claim 5, wherein the converting circuit further comprises a switch circuit, the switch circuit comprises a resistor R1, a first terminal of the resistor R1 is connected to the voltage terminal VCC _ IN, and a second terminal of the resistor R1 is connected to the 7 th pin of the chip U1.
7. The power adapter system for merchandise theft protection according to claim 6, wherein the conversion circuit further comprises a power circuit, the power circuit comprises an inductor L1, a capacitor C3, a capacitor C7, a capacitor C8 and a voltage terminal VBUS, a first terminal of the capacitor C3 is connected to pin 1 of the chip U1, a second terminal of the capacitor C3 is connected to a first terminal of the inductor L1, a second terminal of the inductor L1 is connected to a first terminal of the capacitor C7, a second terminal of the capacitor C7 is grounded, a first terminal of the capacitor C8 is connected to the voltage terminal VBUS, and a second terminal of the capacitor C8 is grounded.
8. The power adapter system for merchandise theft prevention according to claim 7, wherein the conversion circuit further comprises a feedback circuit, the feedback circuit comprising a resistor R2 and a resistor R3, a first terminal of the resistor R2 being connected to the voltage terminal VBUS, a second terminal of the resistor R2 being connected to a first terminal of the resistor R3, a second terminal of the resistor R3 being connected to ground, and a first terminal of the resistor R3 being connected to the 5 th pin of the chip U1.
9. The power adapter system for merchandise theft protection according to claim 8, wherein the conversion circuit further comprises an auxiliary circuit, the auxiliary circuit comprises a capacitor C4, a resistor R4 and a capacitor C5, a first terminal of the capacitor C4 is connected to the 6 th pin of the chip U1, a second terminal of the capacitor C4 is connected to the first terminal of the resistor R4, a second terminal of the resistor R4 is grounded, a first terminal of the capacitor C5 is connected to the 6 th pin of the chip U1, and a second terminal of the capacitor C5 is grounded.
10. The power adapter system for merchandise theft prevention according to claim 9, wherein the auxiliary circuit further comprises a capacitor C6, a first terminal of the capacitor C6 is connected to the 8 th pin of the chip U1, and a second terminal of the capacitor C6 is grounded.
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| CN202110442252.XA CN113140090A (en) | 2021-04-23 | 2021-04-23 | Power adapter system for commodity theft prevention |
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| CN202110442252.XA CN113140090A (en) | 2021-04-23 | 2021-04-23 | Power adapter system for commodity theft prevention |
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| CN211827495U (en) * | 2020-01-26 | 2020-10-30 | 杭州朗鸿智联科技有限公司 | Alarm circuit for commodity anti-theft |
| CN111986421A (en) * | 2020-09-11 | 2020-11-24 | 杭州朗鸿科创科技有限公司 | Safety device for commodity anti-theft |
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