It is shown that the observable 11-year cyclic variation of the total irradiance of the Sun is caused by respective alterations of the radius and effective temperature of the photosphere, which are a consequence of fundamental global processes occurring deeply inside. The 11-year cyclic variation of «solar constant» almost entirely results from respective alterations of the area of the photosphere radiating surface as its effective temperature keeps practically constant. Hence, 11-year heliocycle represents the simultaneous coordinated fluctuation of the activity, radius and irradiance both for the phase and amplitude. The century component is first directly found in variations of «solar constant». We suppose that the observable long-term identical variations of activity, radius and irradiance are a result of the same processes occurring deeply inside and are coordinated by a global variation of the entire Sun which is caused by cyclic changes of temperature in the Sun's core. As this takes place, the long-term global variations of the whole Sun can serve the catalyst of the generation of solar cycles. We predict the approach of the following sufficiently deep minimum of activity, irradiance and radius of the 200-year cycle of the Sun near the year 2040+10. The minimum will be close to the level of the Maunder Minimum.