Device for locking of a slidable element, in particular of a retractable bollard

摘要

Circuits for producing a voltage Vpp from a lower Vcc power supply. Such circuits are useful, for example, in the production of voltage for programming cells of an electrically programmable memory. According to the invention, the circuit includes a charge pump (PMP), a control system (REG) for discontinuing running of the charge pump when voltage (Vpp) exceeds a predefined voltage (VppO), as well as the following elements: a means (Ti) for discontinuing current consumption of the control system upon discontinuing running of the charge pump; and a control circuit (CTRL) for monitoring voltage Vpp and verifying that it does not fall beyond an inferior value dV below VppO. The circuit restores at the same time running of the charge pump and the control system's current supply. The Vpp production circuit current consumption is thereby substantially reduced.