CN217388735U

CN217388735U - Load circuit and PD equipment

Info

Publication number: CN217388735U
Application number: CN202221044200.3U
Authority: CN
Inventors: 孟怀鹏; 陈行; 彭超华; 曹海波; 张亮
Original assignee: Shenzhen Gongjin Electronics Co Ltd
Current assignee: Shenzhen Gongjin Electronics Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-09-06
Anticipated expiration: 2032-04-29

Abstract

The application is suitable for the technical field of power supply, and provides a load circuit and PD equipment. The load circuit comprises a first switch unit, a second switch unit and a load unit; the first switch unit is used for being electrically connected with a controller and an ACDC circuit in the PD equipment, the first switch unit is also electrically connected with the second switch unit, the second switch unit is electrically connected with the load unit, the first switch unit and the second switch unit are both grounded, and the load unit is used for being electrically connected with the ACDC circuit; when the PD equipment is not started, the first switch unit receives a first control signal output by the controller and outputs a first level signal according to the first control signal, and the second switch unit is conducted according to the first level signal, so that the ACDC circuit, the load unit and the ground form a path. The power supply method and the power supply device solve the problem that in a POE power supply scheme, when the power consumption of the PD equipment is low, the PSE end cuts off the power supply to the PD equipment, and the PD equipment cannot be started.

Description

Load circuit and PD equipment

Technical Field

The application belongs to the technical field of power supply, and particularly relates to a load circuit and a PD device.

Background

In a POE (Power Over Ethernet) Power supply scheme, a PSE (Power Sourcing Equipment) can determine whether to supply Power to a PD (Powered Device) Device according to Power consumption of the PD Device based on energy efficiency considerations, but there is a problem: if the power consumption of the PD device is low, the PSE side cuts off the power supply to the PD device, so that the PD device cannot be started.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a load circuit and PD equipment, can solve in POE power supply scheme, when the consumption of PD equipment is very low, PSE end will cut off the power supply to PD equipment, leads to the unable problem that starts of PD equipment.

In a first aspect, an embodiment of the present application provides a load circuit, which is applied to a PD device, and includes a first switch unit, a second switch unit, and a load unit;

the first switch unit is used for being electrically connected with a controller and an ACDC circuit in the PD equipment, the first switch unit is also electrically connected with the second switch unit, the second switch unit is electrically connected with the load unit, the first switch unit and the second switch unit are both grounded, and the load unit is used for being electrically connected with the ACDC circuit;

when the PD device is in a non-on state, the first switch unit is configured to receive a first control signal output by the controller and output a first level signal according to the first control signal, and the second switch unit is configured to be turned on according to the first level signal, so that the ACDC circuit, the load unit, and the ground form a path.

In one possible implementation manner of the first aspect, the first switching unit includes a first triode; the base electrode of the first triode is used for being electrically connected with the controller, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is used for being electrically connected with the ACDC circuit, and the collecting electrode of the first triode is also electrically connected with the second switch unit.

In a possible implementation manner of the first aspect, the first switch unit further includes a first resistor; the first end of the first resistor is used for being electrically connected with the controller, and the second end of the first resistor is electrically connected with the base electrode of the first triode.

In one possible implementation manner of the first aspect, the first switching unit further includes a second resistor; and the first end of the second resistor is connected with the collector of the first triode, and the second end of the second resistor is used for being electrically connected with the ACDC circuit.

In a possible implementation manner of the first aspect, the first transistor is an NPN transistor.

In one possible implementation manner of the first aspect, the second switching unit includes a second triode; the base electrode of the second triode is electrically connected with the collector electrode of the first triode, the emitter electrode of the second triode is grounded, and the collector electrode of the second triode is electrically connected with the load unit.

In a possible implementation manner of the first aspect, the second transistor is an NPN transistor.

In one possible implementation manner of the first aspect, the load unit includes a third resistor; and the first end of the third resistor is electrically connected with the collector of the second triode, and the second end of the third resistor is electrically connected with the ACDC circuit.

In a second aspect, an embodiment of the present application provides a PD device, which is applied to an active ethernet system, and includes an ACDC circuit, a controller, and the load circuit described in any one of the first aspects; the ACDC circuit is electrically connected with the load circuit and the controller respectively, and the load circuit is electrically connected with the controller;

the ACDC circuit is used for supplying power to the controller and the load circuit;

when the PD equipment is in a non-opening state, the controller is used for outputting a first control signal;

and a first switch unit in the load circuit is used for outputting a first level signal according to the first control signal, and a second switch unit is used for being conducted according to the first level signal, so that the ACDC circuit, the load unit and the ground form a path.

In one possible implementation manner of the second aspect, the PD apparatus further includes a communication circuit; the communication circuit is electrically connected with the ACDC circuit and the controller respectively;

the ACDC circuit is used for supplying power to the communication circuit;

the controller is configured to send a first instruction to the communication circuit;

the communication circuit is used for communicating with an external device according to the first instruction.

Compared with the prior art, the embodiment of the application has the advantages that:

the load circuit provided by the embodiment of the application is applied to PD equipment and comprises a first switch unit, a second switch unit and a load unit. The first switch unit is used for being electrically connected with a controller in the PD equipment and the ACDC circuit. The first switch unit is also electrically connected with the second switch unit. The second switch unit is electrically connected with the load unit. The first switch unit and the second switch unit are both grounded. The load unit is used for being electrically connected with the ACDC circuit. When the PD equipment is in a non-opening state, the first switch unit receives a first control signal output by the controller and outputs a first level signal according to the first control signal. The second switch unit is conducted according to the first level signal, so that the ACDC circuit, the load unit and the ground form a path. After ACDC circuit, load unit and the ground form the route, load unit can produce the consumption, has improved the consumption of PD equipment, ensures that the consumption of PD equipment when not opening reaches and predetermines the consumption value, and PSE can continuously supply power to PD equipment this moment, and when needing to open PD equipment, PD equipment can normally be opened.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a load circuit according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a load circuit according to another embodiment of the present application;

fig. 3 is a schematic structural diagram of a load circuit according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of a load circuit according to another embodiment of the present application;

fig. 5 is a schematic structural diagram of a PD apparatus according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of a PD apparatus according to another embodiment of the present application.

In the figure: 10. a PD device; 11. a controller; 12. an ACDC circuit; 13. a load circuit; 131. a first switch unit; 132. a second switching unit; 133. a load unit; 14. a communication circuit.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

The PSE terminal (such as a switch) is responsible for supplying power to the PD equipment, and the PD equipment consumes the power transmitted from the PSE terminal for normal starting and operation. However, some PD devices are not plug-and-play, i.e. the PD device cannot boot directly when plugging in a network cable. However, for the PSE side, when the PD device is plugged into the network, the PSE side starts detecting the PD device through the network, and the ACDC circuit in the PD device converts the 48V voltage provided by the PSE side into a voltage (e.g., 12V or other lower voltage) required by the PD device. After the conversion is completed, if a controller in the PD device is not started and the power consumption of the ACDC circuit is low, when the power consumption on the network cable from the PSE end output port to the PD device input port is not yet equal to a preset power consumption value, the PSE device will cut off the power supply to the PD device, resulting in the PD device being unable to start.

In view of the above problem, as shown in fig. 1, an embodiment of the present application provides a load circuit 13, which includes a first switch unit 131, a second switch unit 132, and a load unit 133. The first switching unit 131 is used to electrically connect with the controller 11 and the ACDC circuit 12 in the PD apparatus 10. The first switching unit 131 is also electrically connected to the second switching unit 132. The second switching unit 132 is electrically connected to the load unit 133. The first and

second switching units

131 and 132 are both grounded. The load unit 133 is for electrical connection with the ACDC circuit 12.

Specifically, when the PD apparatus 10 is in the non-on state, the first switch unit 131 is configured to receive a first control signal output by the controller 11, and output a first level signal according to the first control signal, where the first control signal is a low level signal. The second switching unit 132 is turned on according to the first level signal, so that the ACDC circuit 12, the load unit 133, and the ground form a path. After ACDC circuit 12, load unit 133 and the ground form the route, load unit 133 can produce the consumption, has improved the consumption of PD equipment 10, ensures that the consumption of PD equipment 10 when not opening reaches and predetermines the power consumption value, and the PSE end can continuously supply power to PD equipment 10 this moment, and when needing to open PD equipment 10, PD equipment 10 can be normally opened. The load circuit 13 provided in the embodiment of the present application can solve the problem that in a POE power supply scheme, when the power consumption of the PD device 10 is very low, the PSE side cuts off the power supply to the PD device 10, which results in the PD device 10 being unable to start.

When the PD apparatus 10 is in the on state, the first switch unit 131 is configured to receive the second control signal output by the controller 11, and output a second level signal according to the second control signal, where the second control signal is a high level signal. The second switch unit 132 is turned off according to the second level signal, so that the ACDC circuit 12, the load unit 133 and the ground cannot form a path, and the load unit 133 does not generate power consumption, thereby reducing power consumption of the PD device 10 in the on state.

It should be noted that the ACDC circuit 12 is used to supply power to the first switching unit 131 and the load unit 133.

As shown in fig. 2, the first switching unit 131 includes a first transistor Q1. The base of the first transistor Q1 is configured to be electrically connected to the controller 11, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is configured to be electrically connected to the ACDC circuit 12, and the collector of the first transistor Q1 is further electrically connected to the second switching unit 132.

Specifically, when the PD apparatus 10 is in the non-turned-on state, the base of the first transistor Q1 is used for receiving the first control signal output by the controller 11, the first control signal is a low level signal, so that the emitter and the collector of the first transistor Q1 are disconnected, the collector of the first transistor Q1 outputs a high level first level signal, and the high level first level signal is applied to the second switch unit 132.

When the PD apparatus 10 is in the on state, the base of the first transistor Q1 is used for receiving the second control signal output by the controller 11, the second control signal is a high level signal, so that the emitter and the collector of the first transistor Q1 are turned on, and the collector of the first transistor Q1 outputs a low level second level signal. The second level signal of the low level is applied to the second switching unit 132.

As shown in fig. 2, the first switching unit 131 further includes a first resistor R1. A first end of the first resistor R1 is electrically connected to the controller 11, and a second end of the first resistor R1 is electrically connected to a base of the first transistor Q1.

Specifically, the first resistor R1 is a current limiting resistor, and plays a role of current limiting, so as to prevent the first triode Q1 from being burned out due to an excessive current on the base of the first triode Q1.

The first resistor R1 may be a single resistor, or may be a plurality of resistors, and the plurality of resistors may be in a series form, a parallel form, or a series-parallel form.

As shown in fig. 2, the first switching unit 131 further includes a second resistor R2. A first terminal of the second resistor R2 is connected to the collector of the first transistor Q1, and a second terminal of the second resistor R2 is electrically connected to the ACDC circuit 12.

Specifically, the second resistor R2 is a current limiting resistor, and plays a role of current limiting, so as to prevent the current on the collector of the first triode Q1 from being too large, which may result in burning out the first triode Q1.

The second resistor R2 may be a single resistor or a plurality of resistors, and the plurality of resistors may be in a series form, a parallel form, or a series-parallel form.

Illustratively, the first transistor Q1 is an NPN transistor.

As shown in fig. 3, the second switching unit 132 includes a second transistor Q2. The base of the second transistor Q2 is electrically connected to the collector of the first transistor Q1, the emitter of the second transistor Q2 is grounded, and the collector of the second transistor Q2 is electrically connected to the load unit 133.

Specifically, when the PD device 10 is in the non-turned-on state, the base of the first transistor Q1 is configured to receive the first control signal output by the controller 11, the first control signal is a low level signal, so that the emitter and the collector of the first transistor Q1 are disconnected, the collector of the first transistor Q1 outputs a high level first level signal, the high level first level signal is loaded to the base of the second transistor Q2, so that the second transistor Q2 is turned on, and then the ACDC circuit 12, the load unit 133 and the ground form a path. After ACDC circuit 12, load unit 133 and the ground form the route, load unit 133 can produce the consumption, has improved the consumption of PD equipment 10, ensures that the consumption of PD equipment 10 when not opening reaches and predetermines the power consumption value, and the PSE end can continuously supply power to PD equipment 10 this moment, and when needing to open PD equipment 10, PD equipment 10 can be normally opened.

When the PD apparatus 10 is in the on state, the base of the first transistor Q1 is used for receiving the second control signal output by the controller 11, the second control signal is a high level signal, so that the emitter and the collector of the first transistor Q1 are turned on, and the collector of the first transistor Q1 outputs a low level second level signal. The low-level second level signal is loaded to the base of the second transistor Q2, so that the second transistor Q2 is turned off, the ACDC circuit 12, the load unit 133 and the ground cannot form a path, the load unit 133 does not generate power consumption, and the power consumption of the PD device 10 in the on state is reduced.

Illustratively, the second transistor Q2 is an NPN transistor.

As shown in fig. 4, the load unit 133 includes a third resistor R3. A first terminal of the third resistor R3 is electrically connected to the collector of the second transistor Q3, and a second terminal of the third resistor R3 is electrically connected to the ACDC circuit 12.

Specifically, when the PD device 10 is in the non-turned-on state, the base of the first transistor Q1 is configured to receive a first control signal output by the controller 11, the first control signal is a low-level signal, so that the emitter and the collector of the first transistor Q1 are disconnected, the collector of the first transistor Q1 outputs a high-level first level signal, the high-level first level signal is loaded onto the base of the second transistor Q2, so that the second transistor Q2 is turned on, and then the ACDC circuit 12, the third resistor R3 and the ground form a path. After the ACDC circuit 12 and the third resistor R3 form the path, the third resistor R3 generates power consumption, power consumption of the PD device 10 is improved, power consumption of the PD device 10 when not turned on is guaranteed to reach a preset power consumption value, the PSE terminal continuously supplies power to the PD device 10 at this time, and when the PD device 10 needs to be turned on, the PD device 10 can be turned on normally.

When the PD apparatus 10 is in the on state, the base of the first transistor Q1 is used for receiving the second control signal output by the controller 11, the second control signal is a high level signal, so that the emitter and the collector of the first transistor Q1 are turned on, and the collector of the first transistor Q1 outputs a low level second level signal. The low-level second level signal is loaded to the base of the second triode Q2, so that the second triode Q2 is turned off, and then the ACDC circuit 12, the third resistor R3 and the ground cannot form a path, so that the third resistor R3 does not generate power consumption, and power consumption of the PD device 10 in the on state is reduced.

It should be noted that, when the PD device 10 is in the non-on state, in order to ensure that the power consumption of the PD device 10 reaches the preset power consumption value, the power consumption generated by the third resistor R3 may be set to the preset power consumption value, and the resistance value of the third resistor R3 may be determined according to the preset power consumption value and the voltage provided by the ACDC circuit 12.

It should be noted that, a designer may design a specific value of the preset power consumption value according to actual requirements, for example, the preset power consumption value is set to 0.5W, 0.8W, or 1W.

As shown in fig. 5, the embodiment of the present application further provides a PD apparatus 10 applied to an active ethernet system, including an ACDC circuit 12, a controller 11, and a load circuit 13 as described in any one of the above. The ACDC circuit 12 is electrically connected to the load circuit 13 and the controller 11, respectively, and the load circuit 13 is electrically connected to the controller 11.

Specifically, the ACDC circuit 12 is configured to convert ac power provided by the PSE terminal to the PD device 10 into dc power for powering the controller 11 and the load circuit 13.

When the PD apparatus 10 is in the non-on state, the controller 11 outputs a first control signal, which is a low level signal. The first switching unit 131 in the load circuit 13 outputs a first level signal according to the first control signal. The second switching unit 132 is turned on according to the first level signal, so that the ACDC circuit 12, the load unit 133, and the ground form a path. After ACDC circuit 12, load unit 133 and the ground form the route, load unit 133 can produce the consumption, has improved the consumption of PD equipment 10, ensures that the consumption of PD equipment 10 when not opening reaches and predetermines the power consumption value, and the PSE end can continuously supply power to PD equipment 10 this moment, and when needing to open PD equipment 10, PD equipment 10 can be normally opened.

When the PD apparatus 10 is in the on state, the controller 11 outputs a second control signal, which is a high level signal. The first switching unit 131 in the load circuit 13 outputs a second level signal according to the second control signal. The second switch unit 132 is turned off according to the second level signal, so that the ACDC circuit 12, the load unit 133 and the ground cannot form a path, and the load unit 133 does not generate power consumption, thereby reducing power consumption of the PD device 10 in the on state.

Illustratively, the PD device 10 includes a monitoring camera, a wireless AP, and the like.

As shown in fig. 6, the PD device 10 further includes a communication circuit 14. The communication circuit 14 is electrically connected to the ACDC circuit 12 and the controller 11, respectively.

Specifically, the ACDC circuit 12 is configured to convert ac power provided by the PSE terminal to the PD device 10 into dc power for powering the communication circuit 14. When the PD device 10 needs to communicate with an external device, the controller 11 sends a first instruction to the communication circuit 14, and the communication circuit 14 communicates with the external device according to the first instruction, making the PD device 10 more intelligent.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.

Claims

1. A load circuit is applied to PD equipment and is characterized by comprising a first switch unit, a second switch unit and a load unit;

2. The load circuit of claim 1, wherein the first switching unit comprises a first transistor; the base electrode of the first triode is used for being electrically connected with the controller, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is used for being electrically connected with the ACDC circuit, and the collecting electrode of the first triode is also electrically connected with the second switch unit.

3. The load circuit according to claim 2, wherein the first switching unit further comprises a first resistor; the first end of the first resistor is used for being electrically connected with the controller, and the second end of the first resistor is electrically connected with the base electrode of the first triode.

4. The load circuit according to claim 2, wherein the first switching unit further comprises a second resistor; and the first end of the second resistor is connected with the collector of the first triode, and the second end of the second resistor is used for being electrically connected with the ACDC circuit.

5. The load circuit according to any of claims 2-4, wherein the first transistor is an NPN transistor.

6. The load circuit of claim 2, wherein the second switching unit comprises a second transistor; the base electrode of the second triode is electrically connected with the collector electrode of the first triode, the emitter electrode of the second triode is grounded, and the collector electrode of the second triode is electrically connected with the load unit.

7. The load circuit of claim 6, wherein the second transistor is an NPN transistor.

8. The load circuit according to claim 6, wherein the load unit comprises a third resistor; and the first end of the third resistor is electrically connected with the collector of the second triode, and the second end of the third resistor is electrically connected with the ACDC circuit.

9. A PD apparatus, comprising an ACDC circuit, a controller and a load circuit as claimed in any one of claims 1 to 8; the ACDC circuit is electrically connected with the load circuit and the controller respectively, and the load circuit is electrically connected with the controller;

10. The PD apparatus of claim 9, wherein said PD apparatus further comprises communication circuitry; the communication circuit is electrically connected with the ACDC circuit and the controller respectively;

the ACDC circuit is used for supplying power to the communication circuit;