The patented circuit design of "solar power supply circuit of electronic automatic toll car unit" is its core technology, which can be used by patentees as long as laws and regulations allow. Patent right is a kind of property right. The Patent Law stipulates that "no unit or individual may exploit its patent without the permission of the patentee, that is, it may not manufacture, use, promise to sell, sell or import its patented product for production and business purposes, or use its patented method and use, promise to sell, sell or import the product directly obtained according to the patented method", and the use of others only constitutes infringement on the premise of "production and business purposes".