A parallel machine master-slave identification system for portable power supply

Abstract

The utility model discloses a portable power supply and machine identification system, including two portable power supply and parallel machine line. Every power supply contains microcontroller, parallel machine relay and connecting terminal, and the terminal is equipped with AD detection end, ground terminal, state bit common end, host computer setting end and slave computer setting end. Microcontroller realizes state identification and relay control through the detection AD end level. Two power supplies are connected through parallel machine line: the AD detection end of host computer is connected with the state bit common end of slave computer, and the ground terminal of host computer is connected with the host computer setting end of slave computer, and the state bit common end of host computer is connected with the AD detection end of slave computer, and the slave computer setting end of host computer is connected with the ground terminal of slave computer. The system circuit is simple, realizes parallel machine through specific connection order, and the cost is low and the anti -interference is strong.

Description

Technical Field

[0001] This utility model relates to the field of portable power supplies, and more particularly to a parallel master-slave identification system for portable power supplies. Background Technology

[0002] Traditional parallel master-slave identification methods for portable power supplies utilize CAN communication for handshaking, identifying whether it's in standalone or parallel mode and distinguishing between master and slave units. However, this method, using CAN communication, is costly, complex to control, and susceptible to interference. Therefore, there is an urgent need to develop a low-cost parallel master-slave identification system for portable power supplies.

[0003] This patent has a low cost. As long as the parallel lines are connected in this way, and with our advanced drooping parallel mode, parallel operation can be achieved and it is not easily affected by interference. Utility Model Content

[0004] The present invention aims to provide a low-cost parallel master-slave identification system for portable power supplies, and the technical solution is as follows:

[0005] A parallel master-slave identification system for portable power supplies includes two portable power supplies and a parallel connection line;

[0006] Each portable power supply includes a microcontroller, a parallel relay, and connection terminals;

[0007] The connection terminal is provided with an AD detection terminal, a ground terminal, a status bit common terminal, a master set terminal, and a slave set terminal;

[0008] The AD detection terminal is pulled up to the system power supply through the first resistor and connected to the system ground through the first capacitor;

[0009] The grounding terminal is connected to the system ground;

[0010] The host set terminal is connected to the common terminal of the status bit through a second resistor;

[0011] The slave set terminal is connected to the common terminal of the status bit through a third resistor;

[0012] The microcontroller is used to detect the level of the AD detection terminal connected to it, and to perform parallel operation status identification, master-slave status identification and parallel operation relay control based on the level of the AD detection terminal;

[0013] The parallel relay is used to control the circuit connection between the portable power supply and the power grid or load;

[0014] The two portable power supplies are connected in a cross configuration via a parallel cable:

[0015] The device with the master set pin floating is the master, and the device with the slave set pin floating is the slave.

[0016] The master's AD detection terminal is connected to the slave's status bit common terminal, the master's ground terminal is connected to the slave's master set terminal, the master's status bit common terminal is connected to the slave's AD detection terminal, and the master's slave set terminal is connected to the slave's ground terminal.

[0017] Furthermore, the connection terminal adopts a strip connector, including five terminals, which are defined sequentially from 1 to 5 as: AD detection terminal, ground terminal, status bit common terminal, master set terminal and slave set terminal;

[0018] The parallel line includes a first connector, a second connector, and a connecting wire;

[0019] The first connector and the second connector are respectively used to mate with the connection terminals of the two portable power supplies;

[0020] The first connecting line connects to the first terminal of the first connector and the third terminal of the second connector;

[0021] The second connecting wire connects to the second terminal of the first connector and the fourth terminal of the second connector;

[0022] The third connecting line connects to the third terminal of the first connector and the first terminal of the second connector;

[0023] The fourth connecting wire connects to the fifth terminal of the first connector and the second terminal of the second connector;

[0024] The fourth terminal of the first connector is left unconnected, and the fifth terminal of the second connector is left unconnected.

[0025] Furthermore, the system power supply is 3.3V.

[0026] Furthermore, the nominal resistance values ​​of the first resistor and the second resistor are 4.7kΩ or greater; and the nominal resistance value of the second resistor is 1kΩ or less.

[0027] Compared with the prior art, the significant features of this utility model are:

[0028] The parallel master-slave identification system of this utility model has a simple circuit, realizes parallel operation by connecting parallel lines in a specific sequence, has low cost and is not easily affected by interference. Attached Figure Description

[0029] Figure 1 This is a system block diagram of the parallel master-slave identification system of this utility model. Detailed Implementation

[0030] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0031] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0032] like Figure 1 As shown, this utility model provides a parallel master-slave identification system for portable power supplies, including portable power supplies 10 and 20 connected in parallel and a parallel line 30 connecting the portable power supplies 10 and 20.

[0033] Portable power supplies 10 and 20 have the same configuration. Taking portable power supply 10 as an example, it includes a parallel relay RLY1A, an MCU, resistors R1, R2, and R3, a capacitor C1, and a connection terminal CN1. The connection terminal CN1 has five pins: AD detection terminal CN1-1 (CN1-1 represents pin 1 of connection terminal CN1, and CNx-y below represent pin y of connection terminal CNx), ground terminal CN1-2, status bit common terminal CN1-3, master set terminal CN1-4, and slave set terminal CN1-5. The internal connections of portable power supply 10 are as follows: AD detection terminal CN1-1 is pulled up to +3.3V through resistor R1 and connected to system ground through capacitor C1; ground terminal CN1-2 is connected to system ground; master set terminal CN1-4 is connected to status bit common terminal CN1-3 through resistor R2; and slave set terminal CN1-5 is connected to CN1-3 through resistor R3 and status bit common terminal CN1-3. Connect the MCU and AD detection terminal CN1-1 to the control terminal of the parallel relay RLY1A.

[0034] In application, the normally open terminal of the parallel relay RLY1A is connected to the power grid or load, and the common terminal is connected to the battery through an inverter circuit. When the parallel relay RLY1A is energized, the portable power supply 10 is connected to the power grid or load for charging and discharging control.

[0035] like Figure 1 As shown, portable power supply 10 and portable power supply 20 are operated in parallel in the following manner:

[0036] The connection terminals CN1 of the portable power supply 10 and CN2 of the portable power supply 20 are connected via parallel cable 30. The specific connection relationship of the parallel cable 30 is as follows:

[0037] First connecting line: connects the AD detection terminal CN1-1 of portable power supply 10 and the status bit common terminal CN2-3 of portable power supply 20;

[0038] Second connection line: connects the ground terminal CN1-2 of portable power supply 10 and the host set terminal CN2-4 of portable power supply 20;

[0039] Third connection line: connects the status bit common terminal CN1-3 of portable power supply 10 and the AD detection terminal CN2-1 of portable power supply 20;

[0040] Fourth connection line: Connects the slave set terminal CN1-5 of portable power supply 10 and the ground terminal CN2-2 of portable power supply 20.

[0041] After connection, the master set terminal of portable power supply 10 is left floating, and the slave set terminal of portable power supply 20 is left floating.

[0042] Preferably, the connecting terminals CN1 and CN2 use strip connectors with terminal pitches of 2.5mm, 2.54mm, and 3.96mm, and the parallel line is customized.

[0043] The parallel line includes a first connector, a second connector, and four connecting wires;

[0044] The first connector and the second connector are respectively used to connect to the connection terminals of two portable power supplies that need to be connected in parallel; according to Figure 1 The wiring sequence of the connection terminal CN1 in the middle is as follows:

[0045] The first connecting line connects to the first terminal of the first connector and the third terminal of the second connector;

[0046] The second connecting wire connects to the second terminal of the first connector and the fourth terminal of the second connector;

[0047] The third connecting line connects to the third terminal of the first connector and the first terminal of the second connector;

[0048] The fourth connecting wire connects to the fifth terminal of the first connector and the second terminal of the second connector;

[0049] The fourth terminal of the first connector is left unconnected, and the fifth terminal of the second connector is left unconnected.

[0050] It should be noted that portable power supply 10 and portable power supply 20 use the same modules. For ease of explanation, the component reference numbers in the same positions of the two modules are manually distinguished. Among them, R1=R11=10kΩ; R2=R22=10kΩ; R3=R33=0Ω.

[0051] Preferably, the nominal resistance values ​​of resistors R1 and R11 are ≥4.7kΩ; the nominal resistance values ​​of resistors R2 and R22 are ≥4.7kΩ; and the nominal resistance values ​​of resistors R3 and R33 are ≤1kΩ.

[0052] Parallel relays can be electromagnetic relays, solid-state relays, or other types of relays, but are not limited to these.

[0053] Parallel operation principle:

[0054] When the portable power supply 10 is operating as a standalone device, the voltage at the AD detection terminal CN1-1 is 3.3V;

[0055] When portable power supplies 10 and 20 are correctly connected via parallel cable 30, the voltage at AD detection terminal CN1-1 is 3.3V*R1 / (R1+R22)=1.65V; the voltage at AD detection terminal CN2-1 is 0V. At this time, the operating modes of the portable power supplies can be distinguished by setting threshold values ​​S1 (e.g., S1=2.5V) and S2 (e.g., S2=0.5V) using the voltage divider resistors.

[0056] When the voltage at the AD detection terminal CN1-1 is greater than S2 and less than S1, the portable power supply 10 operates in parallel mode and acts as the host. At this time, the portable power supply 10 actively enters the droop control mode as the host and activates the parallel relay RLY1A.

[0057] When the voltage at the AD detection terminal CN1-1 is less than S2, the portable power supply 10 operates in parallel mode and is a slave device. At this time, the portable power supply 10 acts as a slave device to perform phase locking according to the voltage at the parallel port. After locking the phase of the host device, it activates the parallel relay RLY1A.

[0058] When the voltage at the AD detection terminal CN1-1 is greater than that at S1, the portable power supply 10 operates in stand-alone mode; at this time, it does not enter the parallel droop control mode, and the parallel relay RLY1A does not engage.

[0059] If the two ends of the parallel cable are swapped with the connections of portable power supply 10 and portable power supply 20, the voltage at AD detection terminal CN1-1 will be 0V, and the voltage at AD detection terminal CN2-1 will be 1.65V. At this time, portable power supply 10 will be automatically identified as the slave device, and portable power supply 20 will be automatically identified as the master device.

[0060] The parallel master-slave identification system of this utility model has a simple circuit, realizes parallel operation by connecting parallel lines in a specific sequence, has low cost and is not easily affected by interference.

[0061] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A parallel master-slave identification system for portable power supplies, characterized in that, Includes two portable power supplies and a parallel cable; Each portable power supply includes a microcontroller, a parallel relay, and connection terminals; The connection terminal is provided with an AD detection terminal, a ground terminal, a status bit common terminal, a master set terminal, and a slave set terminal; The AD detection terminal is pulled up to the system power supply through the first resistor and connected to the system ground through the first capacitor; The grounding terminal is connected to the system ground; The host set terminal is connected to the common terminal of the status bit through a second resistor; The slave set terminal is connected to the common terminal of the status bit through a third resistor; The microcontroller is used to detect the level of the AD detection terminal connected to it, and to perform parallel operation status identification, master-slave status identification and parallel operation relay control based on the level of the AD detection terminal; The parallel relay is used to control the circuit connection between the portable power supply and the power grid or load; The two portable power supplies are connected in a cross configuration via a parallel cable: The device with the master set pin floating is the master, and the device with the slave set pin floating is the slave. The master's AD detection terminal is connected to the slave's status bit common terminal, the master's ground terminal is connected to the slave's master set terminal, the master's status bit common terminal is connected to the slave's AD detection terminal, and the master's slave set terminal is connected to the slave's ground terminal.

2. The parallel master-slave identification system for portable power supplies as described in claim 1, characterized in that, The connection terminal adopts a strip connector, which includes five terminals, defined sequentially from 1 to 5 as: AD detection terminal, ground terminal, status bit common terminal, master set terminal and slave set terminal; The parallel line includes a first connector, a second connector, and a connecting wire; The first connector and the second connector are respectively used to mate with the connection terminals of the two portable power supplies; The first connecting line connects to the first terminal of the first connector and the third terminal of the second connector; The second connecting wire connects to the second terminal of the first connector and the fourth terminal of the second connector; The third connecting line connects to the third terminal of the first connector and the first terminal of the second connector; The fourth connecting wire connects to the fifth terminal of the first connector and the second terminal of the second connector; The fourth terminal of the first connector is left unconnected, and the fifth terminal of the second connector is left unconnected.

3. The parallel master-slave identification system for portable power supplies as described in claim 1, characterized in that, The system power supply is 3.3V.

4. The parallel master-slave identification system for portable power supplies as described in claim 1, characterized in that, The nominal resistance values ​​of the first resistor and the second resistor are 4.7kΩ or greater; and the nominal resistance value of the second resistor is 1kΩ or less.

Images