Switching regulation circuit, control circuit thereof and input voltage detecting method for switching regulation circuit
A technology for adjusting circuit and input voltage, which is applied in the direction of adjusting electric variable, control/regulation system, converting DC power input to DC power output, etc., and can solve problems such as circuit damage
Active Publication Date: 2015-01-28
RICHTEK TECH
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Therefore, the existing technology will be in Figure 1D In the situation shown, it is misjudged that the input voltage Vin is ready, so that the control chip 12 will still perform soft start when the power supply of the power stage circuit 11 is not ready, causing the overall circuit to be damaged
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[0051] Please refer to Figure 2A , the switching regulator circuit 20 of the present invention comprises: a power stage circuit 21; and a control circuit 22 (which can be integrated into a control chip with other circuits), including: a switch operation circuit 221; a comparator 222; The gate 224 is driven. The present invention is different from the prior art in that the reference voltage setting level and comparison timing of the comparator 222 are different from the prior art; in detail, the present invention first generates the test signal Vc1 through the switch operation circuit 221, so that The upper bridge element UG of the power stage circuit 11 is turned on (ON) for a period of time, and then the middle voltage Vph (or the divided voltage of the middle voltage Vph) is compared with a reference voltage Vref when the upper bridge element UG is not turned on (OFF) to confirm Whether the input voltage Vin is ready. The test signal Vc1 can be generated according to a po...
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The invention provides a switching regulation circuit which comprises a power level circuit and a control circuit. The power level circuit comprises an upper bridge element and a lower bridge element which are coupled with each other so that input voltage is switched into output voltage, and intermediate voltage is generated at a node between the upper bridge element and the lower bridge element. The control circuit comprises an on-off operation circuit and a comparator, wherein the on-off operation circuit is used for operating the power level circuit and inputting a test signal to the upper bridge element, so that the upper bridge element is turned off after conducted for a period of time, and the comparator generates a ready signal indicating whether the input voltage is ready or not according to comparative results of the intermediate voltage and reference voltage after conduction of the upper bridge element is finished.
Description
technical field [0001] The present invention relates to a switching regulation circuit and its control circuit, and an input voltage detection method used therein, in particular to a switching regulation circuit, its control circuit and related methods that can more accurately judge whether the power supply of a power stage circuit is ready . Background technique [0002] The function of the switching regulator circuit is to convert the input voltage into an output voltage (or output current), which is usually achieved by a control chip controlling a power stage circuit, wherein the chip and the power stage circuit may receive different power sources respectively. And when the power supply of the chip itself is ready and begins to perform soft-start (soft-start), it must be confirmed that the power supply of the power stage circuit is also ready. If the chip performs soft-start when the power supply of the power stage circuit is not ready, the overall circuit may be damaged...
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IPC IPC(8): H02M1/32H02M3/155
Inventor 汪若瑜温伟智
Owner RICHTEK TECH