A switching power supply and a circuit for increasing its output current line regulation

A switching power supply and output current technology, which is applied in the direction of output power conversion devices and electrical components, can solve the problems of small applicable parameter range and low precision, and achieve the effect of wide adaptable parameter range, high precision and improved adjustment rate

CN103390991BActive Publication Date: 2015-10-21CRM ICBG (WUXI) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-10-21

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Abstract

The invention provides a switching power supply and a circuit improving an output current regulation factor of the switching power supply. The circuit improving the output current regulation factor of the switching power supply comprises a voltage amplifier, a voltage comparator, a peak value sampling hold circuit, an error amplifier, a voltage regulator and an RS trigger, wherein the peak value sampling hold circuit carries out sampling hold on sampling voltage after pre-amplification, carries out hold on the peak value of the sampling voltage after pre-amplification, and generates peak value hold voltage, the error amplifier generates a voltage control signal after carrying out comparison on the peak value hold voltage and external reference voltage, the voltage control signal ascends or descends according to the comparison result between the peak value hold voltage and the external reference voltage, the voltage regulator regulates the voltage value of output internal reference voltage according to the voltage control signal, the internal reference voltage descends when the voltage control signal ascends, and the internal reference voltage ascends when the voltage control signal descends. The switching power supply and the circuit improving the output current regulation factor of the switching power supply are large in range of applicable parameters and high in accuracy, and have the obvious advantage of improving the output current line regulation factor.
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Description

technical field

[0001] The invention relates to a switching power supply and its internal circuit, in particular to a switching power supply and a circuit for improving its output current line adjustment rate. Background technique

[0002] Switching power supply has the characteristics of high efficiency and small size, and is the preferred power supply solution for electronic equipment, especially mobile electronic equipment. For offline switching power supplies, it is usually required that the power supply has constant voltage / constant current output characteristics, that is, it can provide a constant output voltage before the load current reaches the limited current, and when the load voltage reaches a constant current, the power supply works in constant current mode and outputs a constant current.

[0003] The flyback power supply can adjust the output voltage and current by detecting the voltage information of the transformer winding to meet the requirements of constant...

Examples

Embodiment Construction

[0059] The present invention will be further described below in conjunction with specific embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.

[0060] Figure 5 The circuit diagram of the switching power supply of this embodiment is shown, and those skilled in the art should understand that, Figure 5 It mainly shows the circuit 20 for improving the output current line regulation rate of the switching power supply and other components directly related to it, but does not show the complete circuit. Those skilled in the art should be able to know the complete circuit of the switching power supply in combination with known peripheral circuits .

[0061] refer to Figure 5 , the switching power supply includes a transformer 501, a switch 502 connected in series with the primary side coil of the transformer 501, and a sampling resistor 503 connected in series with the switch 502, the sampling resistor 503 convert...