利用编程软件实现多台可程控双向电源的并联控制，需通过通信协议（如SCPI、Modbus、TCP/IP）实现设备间的同步与协调，结合软件算法实现电流均衡、故障保护等功能。以下是分步骤的实现方案：
python# 设置主机输出电压为48Vmaster.write("VOLT 48")# 同步从机输出for slave in slaves:slave.write("VOLT 48")
pyvisa
（SCPI通信）、
pymodbus
（Modbus）、
socket
（TCP/IP）。
python
import
pyvisa
# 初始化资源管理器
rm = pyvisa.ResourceManager()
# 连接主机和从机
master = rm.open_resource("TCPIP0::192.168.1.100::inst0::INSTR")
slaves = [rm.open_resource(f"TCPIP0::192.168.1.{101+i}::inst0::INSTR")
for
i
in
range(3)]
# 同步设置输出电压和电流
def
set_output(voltage, current):
master.write(f"VOLT
{voltage}")
master.write(f"CURR
{current}")
for
slave
in
slaves:
slave.write(f"VOLT
{voltage}")
slave.write(f"CURR
{current}")
# 启动输出
master.write("OUTP ON")
for
slave
in
slaves:
slave.write("OUTP ON")
python
from
pymodbus.client
import
ModbusTcpClient
# 主机配置（地址1）
master_client = ModbusTcpClient('192.168.1.100', port=502)
# 从机配置（地址2-4）
slave_clients = [ModbusTcpClient(f'192.168.1.{100+i}', port=502)
for
i
in
range(2,
5)]
# 写入输出电压（寄存器地址40001）
def
set_voltage(voltage):
# 主机设置
master_client.write_register(0, voltage*100, unit=1)# 假设电压单位为0.01V
# 从机设置
for
client, unit
in
zip(slave_clients,
range(2,
5)):
client.write_register(0, voltage*100, unit=unit)
pythondef get_current(device):return float(device.query("MEAS:CURR?"))
pythontotal_current = 50 # 总需求电流（A）currents = [get_current(master)] + [get_current(s) for s in slaves]avg_current = total_current / (1 + len(slaves)) # 均分# 调整主机电流master_adj = avg_current - currents[0]master.write(f"CURR {get_current(master) + master_adj}")# 类似调整从机
simple-pid
库）。
pythonfrom simple_pid import PIDpid = PID(Kp=0.1, Ki=0.01, Kd=0.05, setpoint=avg_current)# 在循环中持续调整while True:current = get_current(master)adjustment = pid(current)master.write(f"CURR {current + adjustment}")
pythondef check_overcurrent(devices, threshold):total = sum(get_current(d) for d in devices)if total > threshold:for d in devices:d.write("OUTP OFF")raise Exception("Overcurrent detected!")
python
import
time
last_response = {d: time.time()
for
d
in
[master] + slaves}
def
heartbeat_check():
for
d
in
[master] + slaves:
try:
d.query("*IDN?")# 发送测试命令
last_response[d] = time.time()
except:
if
time.time() - last_response[d] >
5:# 5秒未响应
print(f"Device
{d}
offline!")
python
import
pyvisa
from
simple_pid
import
PID
import
time
# 初始化设备
rm = pyvisa.ResourceManager()
master = rm.open_resource("TCPIP0::192.168.1.100::inst0::INSTR")
slaves = [rm.open_resource(f"TCPIP0::192.168.1.{101+i}::inst0::INSTR")
for
i
in
range(3)]
devices = [master] + slaves
# PID控制器（主机电流均衡）
pid = PID(Kp=0.1, Ki=0.01, Kd=0.05, setpoint=10)# 目标电流10A
def
main():
try:
# 同步设置输出
for
d
in
devices:
d.write("VOLT 48")
d.write("CURR 15")# 最大电流15A
# 启动输出
for
d
in
devices:
d.write("OUTP ON")
while
True:
# 获取主机电流并调整
current =
float(master.query("MEAS:CURR?"))
adjustment = pid(current)
master.write(f"CURR
{current + adjustment}")
# 检查过流
total =
sum(float(d.query("MEAS:CURR?"))
for
d
in
devices)
if
total >
45:# 总电流超过45A（假设4台设备均分12A）
for
d
in
devices:
d.write("OUTP OFF")
raise
Exception("Overcurrent!")
time.sleep(0.1)
except
KeyboardInterrupt:
print("Stopping...")
finally:
for
d
in
devices:
d.write("OUTP OFF")
master.close()
for
s
in
slaves:
s.close()
if
__name__ ==
"__main__":
main()
logging
模块记录电流、电压数据，便于事后分析。
unittest
框架编写测试用例，验证并联稳定性。
通过上述方法，可实现多台可程控双向电源的高精度并联控制，适用于电池测试、功率电子研发等场景。