Switching power supply device
A technology of switching power supply and switching element, which is applied in the direction of output power conversion devices, electrical components, and adjusting electrical variables, which can solve the problems of insufficient phase margin and unstable operation.
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Example Embodiment
[0033] (Example 1)
[0034] figure 1 It is a circuit configuration diagram of the switching power supply device of Example 1. figure 1 The switching power supply device shown in Example 1 has a voltage detecting unit 1, a target value generating unit 2, a subtractor 3, a digital filter 4, a driving unit 5, a current detecting unit 6, a filter characteristic analysis unit 7, a constant storage unit. 8, high side MOSFET 101, low side MOSFET 102, inductor 103, output capacitor 104, and output load 105. The high side MOSFET 101, the low side MOSFET 102 corresponds to the switching element of the present invention.
[0035] The switching power supply device converts the first DC voltage supplied from the power source Vi via the inductor 103 and the output capacitor 104 to the second DC voltage via the inductor 103 and the output capacitor 104 by alternately conducting and turning on the high side MOSFET 101 and the low side MOSFET 102. The load 105 supplies the output voltage VO.
[0...
Example Embodiment
[0080] (Example 2)
[0081] Figure 9 It is a configuration diagram of the switching power supply device of Example 2. Example 2 Replacing a constant storage unit 8 with respect to Embodiment 1, has a constant calculation unit 9. The other configuration of Example 2 was the same as that of the first embodiment, and therefore, only the constant calculation unit 9 will be described.
[0082] The constant calculation unit 9 analyzes the results (LC resonance frequency f according to the filter characteristic of the filter characteristic analysis unit 7 0 Value), target cross-over frequency FCA, target phase margin PMA, and other settings required, operate the filter constant satisfying the condition, applies the calculated filter constant to the digital filter 4. An example of an arithmetic method in the constant calculating unit 9 is indicated.
[0083] When the optimized filter characteristics meet FZ 1 0 2 2 .
[0084] FZ 2 ≒ -FCA · TAN (PMA + 90DEG) -fz 1 ...... (4)
[0085] In a...
Example Embodiment
[0094] (Example 3)
[0095] Figure 10 It is a configuration diagram of the switching power supply device of Example 3. The switching power supply apparatus of Example 3 additionally added an input voltage detecting unit 10 with respect to the switching power supply device of Example 2. Further, the digital filter 4 is changed to the digital filter 4b. Figure 10 Other structures shown figure 1 The displayed structure is the same, so only different structures are explained.
[0096] The input voltage detecting unit 10 detects the input voltage Vi, and outputs the detected input voltage Vi as the numeric value to the digital filter 4b. The digital filter 4b outputs an analysis signal corresponding to the value of the input voltage Vi detected by the input voltage detecting unit 10 during the filter characteristic analysis period Tr. The drive unit 5 causes the high-side MOSFET 101 and the low side MOSFET 102 in accordance with the analysis signal from the digital filter 4b, and spec...
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