Wide range voltage regulating circuit and implementing method of wide range voltage regulating

Abstract

The invention discloses a wide-range voltage regulation circuit and a method for realizing wide-range voltage regulation. The circuit comprises a control circuit, a voltage reduction conversion unit and a voltage boost conversion unit, wherein the control circuit respectively outputs control signals and is connected with the voltage reduction conversion unit and the voltage boost conversion unit which share the busbar voltage; and the output end of the voltage reduction conversion unit is connected with the output end of the voltage boost conversion unit. The wide-range voltage regulation circuit and the method for realizing wide-range voltage regulation adopt the voltage reduction conversion unit to realize low-voltage section and the voltage boost conversion unit to realize high-voltagesection, synthesize low-voltage output and high-voltage output into a path which is then outputted to a transmitting circuit for power supply, further realize flexible switching between a low-voltagecircuit and a high-voltage circuit through boosting charge for the voltage boost conversion unit in advance, so as to avoid large impact current when the low-voltage circuit is switched to the high-voltage circuit, and avoid damage to devices or voltage sag of the busbar.

Description

【Technical field】 [0001] The invention relates to a voltage regulating circuit. 【Background technique】 [0002] Many electronic instruments and equipment have higher requirements for power supply. For example, in the ultrasonic system, there are two working modes for probe transmission, continuous wave transmission and pulse wave transmission. The voltage is low during continuous wave transmission, and the voltage is high during pulse wave transmission. Therefore, there are corresponding requirements for the power supply of the transmission circuit: output The voltage is required to be continuously adjustable in a wide range, and the load current is large when the output voltage is low, and the load current is small when the output voltage is high. In response to such requirements, there are several existing non-isolated continuously adjustable output voltage topologies, such as figure 1 and figure 2 shown. [0003] Such as figure 1 As shown, the voltage regulating cir...

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Problems solved by technology

[0006] 1. Control loop design is difficult

Because the input voltage is fixed, it is very difficult to ensure the stability of the system under all output voltage and load conditions when the output voltage and load range are very large.

[0007] 2. It is difficult to select power devices such as magnetic core devices and switch tubes

if used figure 1 and figure 2 In the scheme, the high current at low voltage and the high voltage at high voltage require some power devices ( figure 1 Middle MOS tubes D and C, figure 2 Middle Q12 and D12) must meet high current and high voltage at the same time, selection is difficult

In addition, the wire diameter of the inductor must not only meet the high current at low-voltage output, but also must have a large inductance to avoid saturation at high-voltage output, so the volume of the inductor is relatively large

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