Led equipment with constant voltage control and led string comprising the same

A light-emitting diode (LED) equipment with constant voltage control configured to receive a DC voltage, the LED equipment comprising:

• a first controller comprising a positive end and a negative end, and the positive end receiving the DC voltage,
• at least one LED comprising an anode end and a cathode end,
• at least one switch correspondingly coupled in series with the at least one LED, and a number of the at least one LED corresponds to a number of the at least one switch, and
• a voltage control circuit coupled to the positive end and the negative end,
• wherein the first controller is configured to control the at least one switch to be turned on or turned off based on a first control signal, so as to generate a first current flowing from the anode end to the cathode end when the at least one switch is turned on;
• the voltage control circuit is configured to control a voltage across the positive end and the negative end to a fixed voltage, so as to control the first current to be a fixed current, so that a brightness of the at least one LED is corresponding to the fixed current and has a fixed brightness.