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A switching power supply control circuit

A technology of switching power supply and control circuit, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as inability to achieve, adjust control, etc.

Active Publication Date: 2021-05-14
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, for some current-controlled switching power supplies, externally connecting a resistor with a fixed resistance or a capacitor with a fixed value to the current control pin of the current-controlled chip can only meet the functional requirements of the switching power supply in a steady state. In the start-up phase, it is not possible to adjust and control the output frequency, dead time, etc.

Method used

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  • A switching power supply control circuit
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Examples

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no. 1 example

[0039] The LLC resonant converter is a typical current-controlled switching power supply. In the design of the LLC resonant converter, the designer generally knows that the higher the frequency of the circuit during the start-up process of the converter, the better. In this case, the high-resistance characteristics exhibited will suppress the large inrush current generated by the action of the semiconductor switching device on the resonant cavity during the start-up process of the converter, and furthermore, it will also reduce the large voltage stress generated at both ends of the resonant capacitor . Obviously, if the operating frequency of the converter is not increased at start-up, power supply designers often choose switching transistors with larger current margins and film capacitors with higher withstand voltage values ​​for the design of LLC resonant converters. However, high-current switching transistors and high-voltage film capacitors also mean increased design cost...

no. 2 example

[0063] Such as Figure 4 As shown, it is a functional block diagram of the second embodiment of the present invention, which is different from the first embodiment in that a resistor R5 is added to the trigger circuit 11 . One end of the resistor R5 is used to connect the bus voltage V of the LLC resonant converter input BUS , the other end of the resistor R5 is connected to the output end of the comparator U1A. Here, the working principle of controlling the frequency during startup of the LLC resonant converter is the same as that of the first embodiment, and will not be repeated here. Only the changes in the principle of the circuit brought about by adding the resistor R5 are described.

[0064] The output pull-up resistors R4 and R5 of the comparator U1A are respectively connected to a constant voltage V CC The bus voltage V of the LLC resonant converter BUS . Since the output terminal of the comparator U1A is connected to the bus voltage through the resistor R5, it pr...

no. 3 example

[0067] Such as Figure 5 As shown, it is the functional block diagram of the third embodiment of the present invention. The difference from the second embodiment is that the trigger circuit 11 also adds a diode D1, a diode D2 and a resistor R6; the anode of the diode D1 is connected to the bus voltage V of the LLC resonant converter BUS , the cathode of the diode D1 is connected to one end of the resistor R5, and the other end of the resistor R5 is connected to the output end of the comparator U1A. The anode of diode D2 is connected to the voltage signal V converted by temperature change TMP, the cathode of the diode D2 is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to the output end of the comparator U1A. Here, the working principle of controlling the frequency during the start-up of the LLC resonant converter is still the same as that of the first embodiment, and will not be repeated here. Only the changes in the principle of ...

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Abstract

The invention discloses a switching power supply control circuit, which is applied to a current-controlled switching power supply, and is characterized in that it includes a trigger circuit and a current source control circuit, and the trigger circuit samples the state signal of the working state pin of the switching power supply control chip through its input terminal , with reference voltage V REF comparison, when the status signal does not reach the reference voltage V REF , its output terminal provides current for the input terminal of the current source control circuit, and the current source control circuit works under the action of the current source to increase the current value of the current control pin of the switching power supply control chip; when the state signal reaches the reference voltage V REF When , the output terminal of the trigger circuit does not provide a current source for the input terminal of the current source control circuit, and the current source control circuit does not work. The invention not only realizes the purpose of adjusting and controlling the output frequency when the switching power supply is in the start-up stage, but also solves the problems of large ripple noise and poor dynamic characteristics of the switching power supply at no-load or light load.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a current source control circuit of a current-controlled switching power supply. Background technique [0002] With the continuous progress and development of switching power supply technology, there are more and more topology options for switching power supply circuits. For these different circuit topologies, major semiconductor manufacturers at home and abroad have also launched their own control chips. However, referring to the technical manuals of switching power supply control chips released by major semiconductor manufacturers, it can be found that a large number of current source circuits are used inside the control chip. The current changes of these current source circuits are often associated with a certain function or state of the power control chip. [0003] In order to better describe the background technology of the present invention, relevant terms are defined as follows...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M1/36
CPCH02M1/08H02M1/36
Inventor 张聪杨志潘成章
Owner MORNSUN GUANGZHOU SCI & TECH
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