CN210469140U - Power adapter for commodity display - Google Patents

Abstract

The utility model discloses a power adapter for commodity display, which is characterized in that the power adapter comprises an output interface and a voltage regulating circuit; an output interface comprising at least two output electrical contacts configured to be directly or indirectly connected to the voltage regulation circuit; an output interface comprising at least one input electrical contact configured to be directly or indirectly connected to the voltage regulation circuit; a voltage regulating circuit configured to be able to regulate a voltage of the output electrical contact in accordance with a voltage of the input electrical contact; the power adapter is directly or indirectly connected to the display merchandise and is configured to provide power to the display merchandise. Two output electrical contacts of the power adapter are used for supplying power to the display commodity, and the input electrical contact is used for feeding back the voltage condition to the voltage regulating circuit in the power adapter, so that the power adapter can adjust the output voltage according to the voltage fed back, and the input voltage of the commodity connected with the power adapter is ensured to be constant.

Description

Power adapter for commodity display

Technical Field

The utility model relates to a commodity theftproof field especially relates to a power adapter for commodity show.

Background

The anti-theft of goods mainly refers to the actions or measures used in the retail industry for taking certain anti-theft measures to goods placed on a container, a display stand or a display rack and preventing the goods from being taken away in an unauthorized way in the process of display or exhibition. Conventional theft prevention of merchandise may take the form of machinery, such as storing the merchandise in a locked container, or locking the merchandise on a shelf or display stand.

In the commodity show, all need use power adapter to charge for show commodity, need insert power adapter in the supply socket in the show place, owing to receive the place restriction, the commodity on the stand is sometimes far away from supply socket, and the tradition charges for show commodity and adopts two kinds of modes usually: the first is to adopt a plurality of wiring boards for connection, namely, the wiring boards are placed near the display table, and then the conventional power adapter and the wiring boards are connected with each other for power supply, but the mode often has a plurality of wiring boards, which easily causes disorder of wires near the display table and influences the aesthetic degree of the display table; the second mode is that the cable of power adapter is comparatively long, and the length of this cable is greater than the distance of stand to supply socket, however, because the length of cable is big, electric power loss on this cable is just big, consequently, the electric power when transmitting to show commodity often is less than this power adapter's rated power, and the unstable of power supply causes the harm of show commodity thereby to influence the bandwagon effect easily.

In addition, the goods on the exhibition stand need to move within a certain range so as to provide space for functional experience of the exhibition object, and the goods displayed on the goods shelf can be directly taken away from the goods shelf to be settled if a purchaser has a purchase demand, and the purchaser needs to be allowed to take the goods off the goods shelf. The commodity anti-theft principle is that when the commodity is in a non-safety state, a sound and light alarm is given out to prompt staff in a sales place, so that the commodity is often connected with an alarm.

Because in the commodity theftproof field, the show commodity needs to be continuously supplied with power, whether the voltage of this power supply is steady and sufficient, can have very big influence to the life-span of show commodity battery in fact to, because show commodity often need be experienced, the charging wire can be longer, this voltage that just causes actual input to show commodity end easily often than lower, sometimes can appear voltage loss great even, the condition of power supply insufficiency when experiencing.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome prior art not enough, provide a power adapter for commodity show.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a power adapter for commodity display is characterized by comprising an output interface and a voltage regulating circuit; an output interface comprising at least two output electrical contacts configured to be directly or indirectly connected to the voltage regulation circuit; an output interface comprising at least one input electrical contact configured to be directly or indirectly connected to the voltage regulation circuit; a voltage regulating circuit configured to be able to regulate a voltage of the output electrical contact in accordance with a voltage of the input electrical contact; the power adapter is directly or indirectly connected to the display merchandise and is configured to provide power to the display merchandise.

Further, the power adapter is a switched mode power adapter.

Further, the output interface is a USB a or TYPE C interface.

Further, the voltage regulating circuit comprises a control chip.

Further, the control chip comprises a feedback input pin.

Further, the voltage regulation circuit includes an optocoupler configured to be directly or indirectly connected to the feedback input pin and to be directly or indirectly connected to the input electrical contact.

Further, the voltage regulating circuit includes a MOSFET.

Further, the MOSFET adjusts the output voltage according to the duty ratio of the PWM output by the control chip.

The utility model discloses an on the other hand, the utility model provides a take alarm device of feedback function.

An alarm device for merchandise security, comprising an input interface and an output interface, the input interface comprising at least one output electrical contact, the output electrical contact being configured to be directly or indirectly connected to a power adapter and capable of feeding back a voltage to the power adapter; the output interface is configured to be directly or indirectly connected to the article of merchandise and capable of issuing a security signal when the connection to the article of merchandise is broken.

Further, the alarm device provides power to the commodity through the output interface.

Further, the feedback voltage is transmitted to the power adapter in a one-way mode by the alarm device.

Further, the input interface is a USBA or TYPEC interface.

Further, the power adapter includes a voltage regulation circuit, and the output electrical contact is configured to feed back a voltage to the voltage regulation circuit.

Further, the voltage regulating circuit comprises a control chip.

Further, the control chip comprises a feedback input pin.

Further, the voltage regulating circuit includes a MOSFET.

Further, the MOSFET adjusts the output voltage according to the duty ratio of the PWM output by the control chip

To sum up, the utility model discloses increased voltage feedback and compensation, the output voltage that can real-time adjustment adapter end ensures that the voltage that reachs the show commodity end maintains invariable, can effectively solve above-mentioned problem.

The utility model has the advantages that: (1) the output interface of the power adapter comprises at least two output electric contacts and at least one input electric contact, the two output electric contacts are used for supplying power to the display commodities, and the input electric contact is used for feeding back the voltage condition to the voltage regulating circuit in the power adapter, so that the power adapter can adjust the output voltage according to the voltage fed back, and the input voltage of the commodities connected with the power adapter is ensured to be constant.

(2) The input interface on the alarm device comprises at least one output electric contact which can feed back voltage to the power adapter, and the voltage regulating circuit of the power adapter can regulate the output voltage according to the voltage condition fed back from the alarm device so as to ensure that the voltage input to the alarm device is constant.

Drawings

Fig. 1 is a schematic diagram of a front structure of the power adapter of the present invention.

Fig. 2 is a schematic diagram of a three-dimensional structure of the power adapter of the present invention.

Fig. 3 is a schematic diagram of an internal circuit of the power adapter of the present invention.

Fig. 4 is a schematic structural diagram of the power adapter and the cable of the present invention.

Fig. 5 is a schematic structural view of the alarm device of the present invention.

Detailed Description

In order to make the technical field personnel understand the utility model discloses the scheme, will combine the drawing in the embodiment of the utility model below, to the technical scheme in the embodiment of the utility model carries out clear, complete description.

Anti-theft commodity

The merchandise theft prevention referred to in the utility model is particularly directed to some merchandise which needs to be functionally displayed to a purchaser or a potential purchaser, such as displayed merchandise, some functions of which need to be known by a user in a use situation, the merchandise usually has some man-machine interactive interfaces, a displayed person can contact and exemplarily or illustratively use all or part of the functions of the merchandise in a certain range, so as to know the performance of the merchandise, in the industry, the merchandise with functional display requirement is sometimes referred to as merchandise with experience requirement, namely, the displayed person can operate and experience the merchandise in a limited condition and range, therefore, the merchandise can be directly contacted by an experienced person, and the experienced person can be in a limited range of a seller or an owner of the merchandise, for example, the commodities can not be taken out of the sales site, and the ownership of the displayed commodities is also attributed to the seller or the commodity holder, so that anti-theft measures are needed, the anti-theft measures do not limit the use of the experiencers, but only limit the experiencers to take the commodities out of the sales site, and even in some cases, the anti-theft measures need to consider not to hinder the use of the experiencers as much as possible so that the experiencers can obtain better use experience, which is different from the concept of anti-theft in mass vendor sales.

Safe/non-safe states

The safe or unsafe state referred to in the utility model refers to the state of the displayed merchandise, especially refers to the state of the relationship between the displayed merchandise and the anti-theft device under the condition of setting the anti-theft device, generally speaking, the merchandise is in the state that we consider it not stolen, which is referred to as the safe state, which we consider possibly stolen state, which is referred to as the unsafe state, whether the anti-theft measure is intact, whether the displayed merchandise is under the protection of the anti-theft measure, if so, we consider it is the safe state, if not, we consider it is the unsafe state, that is, the safe or unsafe state can be relative to the anti-theft measure, for example, the anti-theft measure is that the displayed merchandise is always connected with the charging interface, then, the sensor detects the charging interface, whether it is always connected with the merchandise, if yes, the system is in a safe state, and if the connection is disconnected, the system is in a non-safe state; or if the anti-theft measure is to keep the commodity in a charging state all the time, the sensor detects whether the charging cable of the commodity keeps power transmission, if so, the charging cable is in a safe state, and if not, the charging cable is in a non-safe state; or, if the anti-theft measure is that the commodity is clamped by the clamping device, the sensor detects whether the commodity is in the clamping space or whether the commodity is in contact with or installed on the clamping device, if so, the commodity is in a safe state, and if not, the commodity is in a non-safe state; and so on.

Unauthorized removal

In the utility model, the non-authorization is relative to the authorization, because in the anti-theft field of goods, there are two modes of locking and unlocking, it should generally be in a locked state during the time the merchandise is being displayed, in which state the merchandise is not stolen, in addition to theft, however, it is possible that an item may be actively removed from the anti-theft device by the merchant, for example, when an item has been released from the market and is no longer sold, the corresponding exhibit is also taken down, which involves the replacement of the goods, or when the exhibit has quality problems, which require maintenance, and may also need to be removed from the anti-theft device, when the displayed merchandise is replaced or repaired, the merchandise may be removed from the anti-theft device by a staff (merchant) with authority, such removal is referred to as removal with authorization, whereas removal is considered unauthorized.

Cable with a flexible connection

The cable is a concept of connection and/or transmission in the present invention, in some cases, the cable may be a purely mechanical connection, connecting two objects, in some cases, the cable may provide power transmission (strong current) to establish power connection for two parties connected by the cable, one party may provide power to the other party, or both parties may have power to transmit each other, in some cases, the cable may provide data transmission (including weak current) to provide power and data connection for two parties connected by the cable, one party may provide power or transmit data signals to the other party, or both parties may have power and data signals to transmit each other, in some cases, the power of the transmission line in the cable may be used as an induction loop, i.e. a determination factor for detecting whether the cable is on or off, for example, when there is power transmission in the cable, the sensing loop can be considered to be smooth, the cable is in a normal connection state, at the moment, if the cable is connected with the commodity and the anti-theft host machine, the commodity can be considered to be in a safe state, or when signals are transmitted in the cable, the sensing loop can also be considered to be smooth, the cable is in a normal connection state, at the moment, if the cable is connected with the commodity and the anti-theft host machine, the commodity can be considered to be in a safe state, under the condition, the cable can play a sensing role and equivalently play a part of a sensor, and the cable at the moment can be used as a part of the sensor.

Connector with a locking member

The connector can be used for connecting parts, the connector can be inserted or inserted in the connecting part, namely, a plug and a socket are included, the connector can have a charging function, for example, in the form of a charging interface, and can also be connected in a pure structure form, the connector can be connected with a cable, and can also be in a separate form, and when the connector is connected with the cable, the connector can also be used as a part of an induction loop on the sensor.

Power socket

The power socket is a device for receiving ac power supplied by commercial power, and in the present invention, the power socket is determined to be a socket fixed to a wall or a floor, etc., and the socket cannot be moved, and the sockets are usually sockets designed to be fixed to a building when the building is finished, for example, a socket fixed to the floor, a socket fixed to a wall, etc.

Wiring board

A patch panel is one type of jack, a multi-hole jack formed by collectively placing a plurality of jacks together, and is removable. The patch panel socket is a multi-jack socket with a power line and a plug and capable of moving, is a common name of a power converter, and has a plurality of types of patch panels and a plurality of types of lengths of the power line of the patch panel, and the main purpose of the patch panel socket is to supply power of a fixed power socket to a certain specified area in a moving mode.

Power adapter

As shown in fig. 1-5, in the present invention, the power adapter 1 includes an output interface and a voltage regulating circuit, the output interface is directly or indirectly connected to the display merchandise, usually connected to the display merchandise through a cable 3, and the voltage regulating circuit is used for regulating the power supply size of the power adapter 1; the power adapter 1 is directly or indirectly connected to a display article and is configured to be capable of providing power to the display article.

And the output interface comprises at least two output electric contacts 6a and at least one input electric contact 5a, the output electric contacts 6a and the input electric contacts 5a are both configured to be directly or indirectly connected to the voltage regulating circuit, and one of the two output electric contacts 6a is used for supplying power to the displayed commodity. The charging state here refers to a state in which the power adapter 1 supplies power to the commodity through the cable, and if the commodity is in the charging state, the commodity is considered to be safe, and if the commodity is in the non-charging state, the charging interface may be pulled out, or the charging cable 3 may be cut off, and in any case, the commodity is considered to be in the non-safe state, and particularly, if the charging interface of the commodity is disconnected in an unauthorized manner, the commodity is considered to be stolen or in danger of being stolen. The connection state here refers to a state in which the goods are physically connected by the cable 3, and this connection state is an anti-theft measure for the goods in a pure structure, if the cable 3 is always structurally connected with the goods, the goods are not separated from the cable 3, and the goods are considered to be safe, if the connection of the goods and the cable 3 is disconnected, for example, the cable 3 is pulled out from the goods, the goods may be considered to be in an unsafe state, and in particular, if the cable 3 is pulled out in an unauthorized manner, the goods may be stolen or in danger of being stolen. The input electrical contact 5a may also be regarded as a contact for feeding back voltage, the connection end of the cable 3 and the power adapter 1 is regarded as the starting end of the cable 3, the connection end of the cable 3 and the commodity is regarded as the terminating end of the commodity, the input electrical contact 5a may input the voltage of the terminating end of the cable 3 into the voltage regulating circuit, and the voltage regulating circuit may regulate the output voltage according to the voltage data acquired by the input electrical contact 5 a.

Specifically, a voltage regulating circuit configured to be able to regulate the voltage of the output electric contact point in accordance with the voltage of the input electric contact 5 a; when the voltage data acquired by the input electrical contact 5a is smaller than the rated voltage of the power adapter 1, at this time, it is considered that the loss voltage on the cable 3 is large, and therefore, it is necessary to adjust the output voltage to be larger, for example, the rated voltage of the power adapter 1 is 5V, the voltage received by the starting end of the cable 3 from the power adapter 1 is 5V, but since the cable 3 is long, the loss of the voltage on the cable 3 is large, and when the voltage is transmitted to the terminating end of the cable 3, the voltage thereof must be smaller than 5V; in contrast, when the voltage data acquired by the input electrical contact 5a is greater than the rated voltage of the power adapter 1, it is determined that the loss voltage on the cable 3 is small, and therefore the output voltage needs to be adjusted to be smaller, in any case, the voltage data acquired by the voltage adjusting circuit from the input electrical contact 5a is the rated voltage of the power adapter 1 in order to ensure that the voltage output to the commodity from the termination end of the cable is abnormal, so that the power supply stability of the displayed commodity is ensured, and the damage to the commodity is not easily caused.

Preferably, the power adapter 1 is a switch-mode power adapter 1, and the switch-mode power adapter 1 has a switch for controlling the power adapter 1 to be turned on or off. The power adapter 1 is turned on, that is, the power adapter 1 is powered on with a power socket, the power adapter 1 is turned off, that is, the power adapter 1 is powered off with the power socket, and the power adapter 1 is provided with a switch mode, which mainly aims at controlling the power adapter 1 and the power socket to be powered on or powered off. Therefore, the power adapter 1 can be powered on or powered off without plugging the power adapter 1 from a power socket, and operation by a user is facilitated.

Preferably, the output interface is a USB a or TYPE C interface, and the output interface can be connected not only to the cable 3 of the USB A4 interface but also to the cable 3 of the TYPE C interface, so that the power adapter 1 can be more diversified.

Preferably, as shown in fig. 3, one end of the power adapter 1 is connected to 220V ac, the other end includes a USB port, the USB port has 4 electrical contacts, the output voltage regulating circuit includes a control chip, the control chip of the present invention can adopt a control chip which is conventional on the market, the control chip includes a feedback input pin, the voltage regulating circuit includes an optical coupler, the optical coupler is an electric-optical-electric conversion device which transmits electrical signals by using light as a medium, and converts the electrical signals of the input end into optical signals by using light as a medium, and then converts the optical signals to the output end, so that the optical coupler is called an optical coupler, the optical coupler is also a common component in the circuit field, the present invention only uses the function of the existing optical coupler, and does not improve the internal structure and principle of the optical coupler, in the present invention, the optical coupler is configured to directly or indirectly connect the feedback input pin, and, the input electrical contact 5a is directly or indirectly connected, that is, the optocoupler is used as a connecting element between the feedback input pin and the input electrical contact 5a, the voltage regulating circuit includes a MOSFET, the MOSFET regulates the output voltage according to the duty ratio of the PWM output by the control chip, as shown in fig. 3, the fourth end of the USB end is a ground terminal, the first and second electrical contacts of the USB end are output electrical contacts 6a, the third electrical contact of the USB end is an input electrical contact 5a, and can be used for inputting the feedback voltage to the voltage regulating circuit, when inputting, the feedback voltage enters the control chip through the optocoupler, the output end of the control chip is connected with the MOSFET, the MOSFET regulates the output voltage according to the duty ratio of the PWM output by the control chip, the regulated voltage is determined and compensated according to the loss on the cable 3 and the rated voltage of the display goods, for example, the loss ratio is 30%, and the rated voltage of, the corresponding adjustment voltage is increased by 5/(1-30%). The utility model discloses in, what voltage regulating circuit mainly realized is that the voltage information according to input electrical contact 5a feedback adjusts output voltage, and the feedback input pin is exactly the part that receives the voltage information of feedback on the control chip, when control chip received this feedback information, just can control voltage regulating circuit regulated voltage's size.

When the feedback voltage received by the input electric contact 5a is smaller than the rated voltage, the feedback voltage is transmitted to the feedback input pin through the optical coupler, after the control chip obtains the information of the feedback input pin, the duty ratio of the PWM output by the control chip can be obtained, the duty ratio of the PWM at the moment is smaller, and the MOSFET in the voltage regulating circuit can regulate the output voltage to be larger according to the data that the duty ratio of the PWM output by the control chip is smaller, so that the output voltage of the power adapter 1 is improved; on the contrary, when the feedback voltage received by the input electrical contact 5a is greater than the rated voltage, the feedback voltage is transmitted to the feedback input pin through the optical coupler, and after the control chip obtains the information of the feedback input pin, the control chip can output the duty ratio of the PWM, and the duty ratio of the PWM at this time is greater, and the MOSFET in the voltage regulating circuit can regulate the output voltage to be smaller according to the data that the duty ratio of the PWM output by the control chip is greater, so that the output voltage of the power adapter 1 is reduced.

Alarm device

The utility model discloses an alarm device is burglar alarm, and mainly used commodity is at the warning of show in-process, and alarm device includes alarm equipment such as bee calling organ, LED pilot lamp, and when the commodity is unauthorized to be removed, alarm device can sound, suggestion such as light are reported to the police, tell relevant staff that this commodity is in unsafe state.

The alarm device 2 comprises an input interface and an output interface, the input interface is an interface for connecting the alarm device 2 and the power adapter 1, and the output interface is an interface for connecting the alarm device 2 and the commodity; the input interface comprises at least one output electrical contact 6b, which output electrical contact 6b is configured to be directly or indirectly connected to the power adapter 1 and is capable of feeding back a voltage to the power adapter 1. The power adapter 1 comprises a voltage regulating circuit to which the output electrical contacts 6b on the alarm device 2 are configured to feed back a voltage. That is to say, the feedback circuit arranged on the alarm device 2 feeds back the voltage condition to the power adapter 1, and the voltage regulating circuit in the power adapter 1 can perform voltage regulating processing through the feedback voltage, so that the alarm device 2 obtains the rated voltage. Normally, the alarm device 2 can obtain power through the input interface, but sometimes, because the cable 3 of the power adapter 1 is too long or too short, the voltage output by the power adapter 1 is excessively lost or dropped on the cable 3, so that the voltage received by the alarm device 2 is not the rated voltage output by the power adapter 1. When the cable of the power adapter 1 is too long, the voltage loss on the cable is larger, and at the moment, the voltage received by the alarm device 2 is smaller than the rated voltage of the power adapter 1; when the cable of the power adapter 1 is too short, the voltage loss on the cable is smaller, and at this time, the voltage received by the alarm device 2 is greater than the rated voltage of the power adapter 1. Regardless of whether the voltage received by the alarm device 2 is too large or too small, the alarm device 2 is easily damaged, and the alarm device 2 is abnormal.

Therefore, the utility model discloses set up an output electrical contact 6b on alarm device 2, this output electrical contact 6b can be to power adapter 1 feedback voltage, and feedback voltage is alarm device 2 to power adapter 1 one-way transmission. By feedback voltage is meant that the output electrical contact 6b on the alarm device 2 is able to feed back the actual voltage received on the alarm device 2 to the power adapter 1. For example, the rated voltage of the power adapter 1 is 5V, the voltage actually received by the alarm device 2 is 3.5V, at this time, the output electrical contact 6b on the alarm device 2 can feed back the actual voltage condition of receiving 3.5V to the power adapter 1 (the data here is only applicable to examples and does not represent actually occurring numbers), the power adapter 1 is provided with a voltage regulating circuit, the voltage regulating circuit can know that the voltage actually received by the alarm device 2 is less than the rated voltage 5V through the feedback voltage, at this time, the voltage regulating circuit can regulate the output voltage of the power adapter 1, that is, the output voltage is regulated, thereby compensating the voltage lost on the cable 3, and making the voltage finally obtained by the alarm device 2 be 5V. In contrast, if the output voltage is large, for example, when the voltage actually received by the alarm device 2 exceeds 5V, for example, 5.5V (the data herein is only applicable to examples and does not represent actually occurring numbers), at this time, the output electrical contact 6b on the alarm device 2 can feed back the actual voltage condition of receiving 5.5V to the power adapter 1, the power adapter 1 is provided with a voltage regulating circuit, the voltage regulating circuit can know that the voltage actually received by the alarm device 2 is greater than the rated voltage of 5V through the feedback voltage, at this time, the voltage regulating circuit can regulate the output voltage of the power adapter 1, that is, the output voltage is adjusted downward, so that the voltage finally obtained by the alarm device 2 is 5V, thereby realizing dynamic voltage regulation, and signal transmission of voltage feedback can be realized through a wire.

Further, the output interface is configured to be directly or indirectly connected to the article of merchandise, capable of issuing a security signal when the connection to the article of merchandise is disconnected, and the output interface provides power to the article of merchandise. The output interface of the alarm device 2 can supply power to the commodity, so that one more power adapter 1 for supplying power to the commodity is not needed, and the whole display and exhibition is more concise and attractive. The alarm device 2 provides an alarm, and is mainly determined from two aspects, namely, firstly, whether the power adapter 1 is powered off or not is determined from the input interface, namely, when the alarm device 2 does not receive the power provided by the power adapter 1 or the input interface of the alarm device 2 is disconnected from the power adapter 1, the alarm device 2 can give an alarm prompt, secondly, whether the commodity is connected is determined from the output interface, and when the alarm device 2 is disconnected from the commodity, the alarm device 2 also gives an alarm prompt.

It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Claims (8)

1. A power adapter for commodity display is characterized by comprising an output interface and a voltage regulating circuit;

the output interface comprises at least two output electrical contacts configured to be directly or indirectly connected to the voltage regulating circuit;

the output interface comprising at least one input electrical contact configured to be directly or indirectly connected to the voltage regulation circuit;

the voltage regulating circuit is configured to be capable of regulating the voltage of an output electric contact point according to the voltage of the input electric contact point;

the power adapter is directly or indirectly connected to a display article and is configured to provide power to the display article.

2. The power adapter for merchandise display of claim 1, wherein said power adapter is a switch mode power adapter.

3. The power adapter for merchandise display of claim 1, wherein said output interface is a USB a or TYPE C interface.

4. The power adapter for merchandise display of claim 1, wherein the voltage regulator circuit comprises a control chip.

5. The power adapter for merchandise display of claim 4, wherein the control chip comprises a feedback input pin.

6. The power adapter for merchandise display of claim 5, wherein the voltage regulating circuit comprises an optocoupler configured to directly or indirectly connect the feedback input pin and to directly or indirectly connect the input electrical contact.

7. The power adapter for merchandise display of claim 5, wherein said voltage regulating circuit comprises a MOSFET.

8. The power adapter for merchandise display according to claim 7, wherein the MOSFET adjusts the output voltage according to the PWM duty cycle outputted from the control chip.

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