A power adapter with communication function

Abstract

The application discloses a power adapter with communication function, which comprises a constant voltage source, a controlled constant voltage source, a current sampling resistor and a selection switch, wherein the constant voltage source is used for changing the output voltage according to the command of the power consumption end; the controlled constant voltage source is used for outputting different voltage signals; the selection switch is used for switching between the constant voltage source and the controlled constant voltage source; and the current sampling resistor is used for collecting the output current of the power supply. The application can automatically negotiate the power supply voltage and the power supply current, and realizes the configuration of the power supply voltage and the power supply current without additionally increasing the cable or the wireless communication module.

Description

Technical Field

[0001] This invention belongs to the field of electrical engineering, and specifically relates to a power adapter. Background Technology

[0002] The base station for lawnmower robots needs to be connected to a power adapter to generate boundary signals and charge the robot. Since lawnmowers come in various voltage levels, such as the common 18V and 28V, each requires a dedicated power adapter, increasing the number of accessory models and preventing universal compatibility.

[0003] In addition, sometimes customers' AC power outlets are far from the base station, and they use power adapters with long DC cables. This can lead to a large voltage drop across the cable when the load current is high, causing the voltage at the base station to be lower than the operating voltage and preventing it from working properly. Summary of the Invention

[0004] The purpose of this invention is to provide a power adapter with communication function to achieve automatic negotiation of power supply voltage and current.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A power adapter with communication function includes a constant voltage source, a controlled constant voltage source, a current sampling resistor, and a selection switch, wherein:

[0007] The constant voltage source is used to change the output voltage according to the command from the power user.

[0008] The controlled constant voltage source is used to output different voltage signals;

[0009] The selection switch is used to switch between a constant voltage source and a controlled constant voltage source;

[0010] The current sampling resistor is used to collect the output current of the power supply.

[0011] The positive terminal of the constant voltage source is connected to the current sampling resistor via a selection switch, and the negative terminal is connected to the power supply terminal; the positive terminal of the controlled constant voltage source is connected to the current sampling resistor via a selection switch, and the negative terminal is connected to the power supply terminal.

[0012] The power-consuming terminal includes a variable resistor, a load switch, and a load. The load and the load switch are connected in series, and the load and the variable resistor are connected in parallel. The variable resistor can change its resistance value according to the command and generate different magnitudes of sink current at the power-consuming terminal.

[0013] After the power adapter is powered on, the constant voltage source will output the lowest voltage by default. The selector switch can be used to switch to the constant voltage source.

[0014] At the power consumption end, the voltage value is checked to confirm whether it is the voltage required. Before the correct voltage level is obtained, the load switch is open and the load is not actually connected.

[0015] When the power user wants to change the output voltage level, it initiates communication with the power adapter, which controls the resistance value of the variable resistor to generate current in different states. After encoding the different current state combinations, the control commands from the power user are transmitted on the power line.

[0016] The power adapter monitors the current by monitoring the voltage across the current sampling resistor, analyzes the current state pattern, and parses it according to the agreed-upon protocol to obtain commands from the power user. The power adapter then operates based on these commands.

[0017] When the power-consuming terminal and the power adapter do not need to communicate, the variable resistor circuit is turned off.

[0018] The operation of the power adapter includes setting the output voltage and setting the maximum current.

[0019] When the power adapter needs to send information to the power user, it selects the controllable constant voltage source by switching the selector switch to control the constant voltage source to output voltages of different states according to the format agreed upon by both parties. After the message is sent, the selector switch is switched back to the constant voltage source. The power user obtains the voltage status by monitoring the voltage, thereby receiving the information sent by the power adapter.

[0020] The power adapter sends its output voltage, maximum current, and current temperature information to the power user.

[0021] Beneficial effects: The power adapter with communication function of the present invention can automatically negotiate the power supply voltage and current. It achieves the configuration of power supply voltage and current without adding additional cables or wireless communication modules. Attached Figure Description

[0022] Figure 1 This is the circuit schematic diagram of the present invention;

[0023] Figure 2 This is a schematic diagram illustrating the communication status between the power user and the power adapter in the embodiment.

[0024] In the diagram, Usource is a constant voltage source, Us is a controlled constant voltage source, Rs is a current sampling resistor, Sa is a selection switch, Rv is a variable resistor, Usink is the voltage at the terminal, Sb is a load switch, and RL is the load. Detailed Implementation

[0025] The invention will now be further explained with reference to the accompanying drawings.

[0026] like Figure 1 As shown, a power adapter with communication function according to the present invention includes a constant voltage source Usource, a controlled constant voltage source Us, a current sampling resistor Rs, and a selection switch Sa, wherein:

[0027] The positive terminal of the constant voltage source Usource is connected to the current sampling resistor Rs via the selection switch Sa, and the negative terminal is connected to the power supply terminal. The constant voltage source Usource represents the power supply of the original power adapter and can change the output voltage according to the command received from the power supply terminal.

[0028] The positive terminal of the controlled constant voltage source Us is connected to the current sampling resistor Rs via a selection switch Sa, and the negative terminal is connected to the power supply terminal; the controlled constant voltage source Us is used to output different voltage signals.

[0029] The current sampling resistor Rs is used to collect the output current of the power supply.

[0030] The selector switch Sa is used to switch between the constant voltage source Usource and the controlled constant voltage source Us.

[0031] The power supply terminal includes a variable resistor Rv, a load switch Sb, and a load RL. The load RL and load switch Sb are connected in series, and the load RL and variable resistor Rv are connected in parallel. The variable resistor Rv can change its resistance value according to the command, generating a sink current Isink of different magnitudes at the power supply terminal. When the load switch Sb is open, the load RL is disconnected from the power supply.

[0032] The communication process from the power consumer to the power adapter is as follows:

[0033] After the power adapter is powered on, the constant voltage source Usource will output the lowest voltage by default. Select the switch Sa to switch to the constant voltage source Usource.

[0034] At the power consumption end, the voltage value Usink is detected to confirm whether it is the voltage required. Before obtaining the correct voltage level, the load switch Sb is open, and the load RL is not actually connected.

[0035] When the power user wants to change the output voltage level, it initiates communication with the power adapter, which controls the resistance value of the variable resistor Rv to generate current in different states. After encoding the different current state combinations, the control commands from the power user are transmitted on the power line.

[0036] The power adapter monitors the current by monitoring the voltage across the current sampling resistor Rs, analyzes the current state pattern, and parses it according to the agreed protocol to obtain the commands issued by the power user. The power adapter then operates according to different commands, such as setting the output voltage or setting the maximum current.

[0037] When the power supply terminal and the power adapter do not need to communicate, turn off the variable resistor Rv circuit.

[0038] The communication process from the power adapter to the power consumer is as follows:

[0039] When the power adapter needs to send information to the power user, it selects the controlled constant voltage source Us by selecting the selector switch Sa. The controlled constant voltage source Us outputs voltages in different states according to the format agreed upon by both parties. After the message is sent, the selector switch Sa is switched back to the constant voltage source Usource. The power user obtains the voltage status by monitoring the voltage Usink, thereby receiving the information sent by the power adapter.

[0040] Through this communication process, the power adapter sends information such as its output voltage, maximum current, and current temperature to the user, who then performs the next step.

[0041] The present invention will be further illustrated by the following examples.

[0042] Example:

[0043] In this embodiment, the communication process from the power user to the power adapter is as follows:

[0044] After the power adapter is powered on, the constant voltage source Usource will output the lowest voltage by default. Select the switch Sa to switch to the constant voltage source Usource.

[0045] At the power consumption end, the voltage value Usink is detected to confirm whether it is the voltage required. Before obtaining the correct voltage level, the load switch Sb is open, and the load RL is not actually connected.

[0046] When the power user wants to change the output voltage level, it initiates communication with the power adapter. The adapter controls the value of the variable resistor Rv to generate different current states. After encoding the different current state combinations, the control commands from the power user are transmitted over the power line. For example:

[0047] Isink = 100mA defines state a

[0048] Isink = 50mA defines state b

[0049] The power adapter monitors the current by monitoring the voltage across the current sampling resistor Rs, analyzes the current state pattern, and parses it according to the agreed protocol to obtain the commands issued by the power user. The power adapter then operates according to different commands, such as setting the output voltage or setting the maximum current.

[0050] The communication process from the power adapter to the power consumer is as follows:

[0051] When the power adapter needs to send information to the user, it selects the controllable constant voltage source Us using the selector switch Sa. This controls the controllable constant voltage source Us to output voltages in different states according to a pre-agreed format. After the message is sent, the selector switch Sa is switched back to the constant voltage source Usource. The user then monitors the voltage Usink to obtain the voltage status and thus receive the information from the power adapter. For example:

[0052] Us = 12V defines state a

[0053] Us = 6V defines state b

[0054] like Figure 2 Logic 1 and Logic 0 are defined. For Logic 1, state a accounts for 60% of the time and state b accounts for 40% of the time. For Logic 0, state a accounts for 40% of the time and state b accounts for 60% of the time. Based on this set of rules, bidirectional communication between the power adapter and the electrical equipment can be achieved.

[0055] State A accounts for 20%, state B accounts for 80%, and the total duration of state A + state B is set at 10ms.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A power adapter with communication function, characterized in that: Includes a constant voltage source, a controlled constant voltage source, a current sampling resistor, and a selection switch, wherein: The constant voltage source is used to change the output voltage according to the command from the power user. The controlled constant voltage source is used to output different voltage signals; The selection switch is used to switch between a constant voltage source and a controlled constant voltage source; The current sampling resistor is used to collect the output current of the power supply; The positive terminal of the constant voltage source is connected to the current sampling resistor via a selection switch, and the negative terminal is connected to the power consumption terminal; the positive terminal of the controlled constant voltage source is connected to the current sampling resistor via a selection switch, and the negative terminal is connected to the power consumption terminal. After the power adapter is powered on, the constant voltage source will output the lowest voltage by default. The selector switch can be used to switch to the constant voltage source. At the power consumption end, the voltage value is checked to confirm whether it is the voltage required. Before the correct voltage level is obtained, the load switch is open and the load is not actually connected. When the power user wants to change the output voltage level, it initiates communication with the power adapter, which controls the resistance value of the variable resistor to generate current in different states. After encoding the different current state combinations, the control commands from the power user are transmitted on the power line. The power adapter monitors the current by monitoring the voltage across the current sampling resistor, analyzes the current state pattern, and parses it according to the agreed-upon protocol to obtain commands from the power user. The power adapter then operates based on these commands.

2. The power adapter with communication function according to claim 1, characterized in that: The power-consuming terminal includes a variable resistor, a load switch, and a load. The load and the load switch are connected in series, and the load and the variable resistor are connected in parallel. The variable resistor can change its resistance value according to the command and generate different magnitudes of sink current at the power-consuming terminal.

3. The power adapter with communication function according to claim 1, characterized in that: When the power-consuming terminal and the power adapter do not need to communicate, the variable resistor circuit is turned off.

4. The power adapter with communication function according to claim 1, characterized in that: The operation of the power adapter includes setting the output voltage and setting the maximum current.

5. The power adapter with communication function according to claim 1, characterized in that: When the power adapter needs to send information to the power user, it selects the controllable constant voltage source by switching the selector switch to control the constant voltage source to output voltages of different states according to the format agreed upon by both parties. After the message is sent, the selector switch is switched back to the constant voltage source. The power user obtains the voltage status by monitoring the voltage, thereby receiving the information sent by the power adapter.

6. The power adapter with communication function according to claim 5, characterized in that: The power adapter sends its output voltage, maximum current, and current temperature information to the power user.

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