A quick start circuit for dc-dc converter
A fast-start, DC-DC technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of slow start, no converter, and low charging current, so as to improve the start-up speed, the converter is flexible, and the energy saving The effect of opening time
Inactive Publication Date: 2017-08-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
General DC-DC converters need loop compensation, and the usual practice is to connect a large capacitor to the output of the error comparator, and the charging current of the error comparator to the external large capacitor is relatively small, resulting in the output of the error comparator. Quickly reach the required comparison level, causing the converter to have no switching action during this period, and the start-up becomes slow
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[0016] figure 1 It is a schematic diagram of the logical structure of the quick start circuit for the DC-DC converter of the present invention, such as figure 1 As shown, the error amplifier compares the feedback voltage with the reference voltage, and the PWM error amplifier output (VE) is connected to the compensation network (resistor R and capacitor C are connected in series). VC is the voltage signal obtained by current sampling and superposition of a DC fixed level. The comparator compares VE and VC signals to obtain a duty ratio modulation signal to control the power tube to be turned on and off. As soon as the system is powered on, the output of the error amplifier is connected to a large capacitor C, the voltage at this point cannot change rapidly, and VE is close to 0. When VEVC, the system will switch. In order to reduce the time for the VE point potential to rise to the VC voltage, the present invention designs figure 1 The fast-start clamp circuit in the dotted...
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The invention belongs to the technical field of electronic circuits, and in particular relates to a quick start circuit for a DC-DC converter. The circuit provided by the present invention is mainly to add the previous circuit composed of an operational amplifier, a power switch tube and a logic control module to the traditional DC converter control circuit, and the output of the error amplifier is quickly clamped to the load current sampling through the clamp circuit. The DC working potential of the information accelerates the startup; after the logic control circuit detects that the power tube is turned on several times, it closes the clamping circuit to make it out of the loop. The beneficial effect of the present invention is that it can effectively increase the opening speed of the DC-DC converter, save the opening time of the converter, and make the converter more flexible; at the same time, when the converter is working normally, the present invention can break away from the loop , to ensure that the stability of the converter will not be affected.
Description
technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a quick start circuit with a clamping circuit for a DC-DC converter. Background technique [0002] A DC-DC converter usually includes an error amplifier, a PWM comparator, driving logic, and a power transistor. The output of the error comparator is compared with the signal obtained by current sampling to generate a square wave control signal for turning on and off the power transistor. General DC-DC converters need loop compensation, and the usual practice is to connect a large capacitor to the output of the error comparator, and the charging current of the error comparator to the external large capacitor is relatively small, resulting in the output of the error comparator. The required comparison level is quickly reached, causing the converter to have no switching action during this period, and the start-up becomes slow. Contents of the invention [0...
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IPC IPC(8): H02M1/36
Inventor 罗萍周才强王军科曹灿华王骥寇武杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA