A switching circuit and switching method for pulse wave modulation and pulse-skipping cycle modulation
A technology of pulse skipping cycle and switching circuit, which is applied in the direction of adjusting electrical variables and output power conversion devices, electrical components, etc., can solve the problems of sacrificing chip yield and change, improve robustness and yield, and achieve stable switching thresholds Effect
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Embodiment 1
[0045] Figure 4 A schematic structural diagram of a threshold circuit in a switching circuit for pulse wave modulation and pulse skip cycle modulation provided in Embodiment 1 of the present invention. The switching circuit includes a sampling circuit, an EA1 operational amplifier, a PWM comparator, a signal generator, a threshold circuit, a PSM comparator, a PSM logic circuit, a flip-flop, a driver and a CLK clock signal, Figure 4 The structural diagram of the threshold circuit is only given as an example, and the rest of the switching circuit can be referred to figure 1 shown, and will not be repeated here.
[0046] Such as Figure 4 As shown, the threshold value circuit 5 includes a reference current source Iref, a signal current terminal current Iramp of a signal generator, a first proportional circuit A1, a second proportional circuit A2, an adder S1 and a reference resistor Rpfm, wherein,
[0047] The input terminal of the first proportional circuit A1 is connected ...
Embodiment 2
[0059] On the basis of the technical solution provided by the first embodiment above, further, the structure of the signal generator 4 is further limited, and the signal generator 4 is used to generate the signal current Iramp.
[0060] The signal generator 4 can generate a triangle wave, a sine wave, a cosine wave or a ramp current. In this embodiment, preferably, a slope compensation circuit is used as the signal generator 4, and the signal current Iramp generated by it is a ramp current. Moreover, the slope compensation circuit is controlled by the gate control signal Vhgate of the upper side transistor. The following takes the signal generator as an example of a slope compensation circuit for illustration.
[0061] Figure 5 A schematic structural diagram of a signal generator in a switching circuit for pulse wave modulation and pulse skip cycle modulation provided by Embodiment 2 of the present invention. Such as Figure 5 As shown, the signal generator 4 is a slope co...
Embodiment 3
[0073] Figure 7 It is a flow chart of a method for switching between pulse wave modulation and pulse skip cycle modulation provided by Embodiment 3 of the present invention. Embodiment 3 of the present invention provides a switching method of pulse wave modulation and pulse skipping cycle modulation. The switching method is applied to the switching circuit of pulse wave modulation and pulse skipping cycle modulation described in any of the above embodiments. The switching method includes The following steps:
[0074] S101. Determine the signal resistance of the signal generator according to the sampling current ratio of the sampling circuit and the transimpedance gain of the operational amplifier.
[0075] Usually, the size of the transistor is designed according to the maximum output power requirement in the DC / DC converter. In the actual manufacturing of the chip, a multi-finger (multi-finger) structure is generally used, that is, multiple transistors with appropriate widt...
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