Dual-mode switching frequency control system
A switching frequency and control system technology, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve the problem of difficult to meet various application scenarios, single mode of switching frequency control system, etc. problem, to achieve the effect of solving the switching frequency single-mode control and establishing a fast speed
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Embodiment 1
[0055] Such as figure 1 As shown, a dual-mode switching frequency control system includes: an enabling circuit 10 , a mode determination circuit 20 , a phase detector 30 , a loop filter 40 and an oscillator 50 .
[0056] The enabling circuit 10 outputs an enabling signal EN according to the input signal EN_CK, and the enabling signal EN is an enabling signal of the entire switching frequency control system. The input signal EN_CK is equal to the enable signal EN. When the two are "1", the entire switching frequency control system works normally. When the enable signal EN is "0", the entire switching frequency control system does not work. Therefore, the following analysis is to make The premise is that the enable signal EN is "1". The input signal FORCE_FMIN is used to indicate whether the system is operating at the lowest frequency and at the same time the enabling signal EN1 is output through the enabling circuit 10. When the input signal FORCE_FMIN is "1", the enabling sig...
Embodiment 2
[0088] In order to solve the problem in Embodiment 1 that the system will have abnormal behavior when it just exits the lowest frequency working state, such as Figure 6 As shown, this embodiment provides another dual-mode switching frequency control system, including: a first phase-locked loop and a second phase-locked loop. The first phase-locked loop includes a phase detector 100, a loop filter 200, and a first oscillator 300; the second oscillator 400 and the first oscillator 300 can be switched to form a second phase-locked loop, that is, the first phase-locked loop The phase loop and the second phase locked loop share the phase detector 100 and the loop filter 200 .
[0089] The dual-mode switching frequency control system also includes a first selector and a second selector, the I0 input and output of the first selector are connected to the first oscillator 300, and the I1 input of the first selector is connected to the second oscillator 400 . The I0 input terminal of...
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