A typical switch capacitive converters include four large MOS switch, its switch for typical switch, order double or halve input voltage. Energy transfer and storage provided by external capacitor.
The first part of the switch cycle, in the role of a capacitor input voltage (C1). The second part of the switch cycle transferred from C1, charge on the second capacitor C2. The most traditional switch capacitive converter structure is a reverse flow changing device, including with a grounding are end with C2, the negative terminal transfer negative output voltage. After several cycles, the voltage by C2 after the input voltage will be applied to. Assuming no load, switch C2 no loss and no continuous in capacitor, the output voltage resistance will just be input voltage of negative. In reality, charge transfer efficiency (and thus lead to the accuracy of the output voltage switching frequency and switch) depends on the value of the resistor, capacitor and continuous resistance. A similar topological structure? Times pressure gauges use the same switches and capacitor set, but changed grounding connection and input voltage. Other more complex varieties products use supplementary switches and capacitor realize input voltage and output voltage of other transformation ratio and, in some cases, the use of specialized switch order to produce scores relations (for example 3/2). In all kinds of the most simple forms, switch capacitive converter is does not have the voltage function. Some new National semiconductor switching capacitive converter possesses automatic adjustment gain levels of output voltage to produce after; Other switch capacitive converter using a built-in low pressure drop linear regulators produce the output voltage without passing through.