Under-voltage turn-off output module, BOOST power supply chip and boost power supply system
An output module and output terminal technology, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve problems affecting customer experience, voltage rise, system damage, etc.
Active Publication Date: 2021-08-13
SHANGHAI XINLONG SEMICON TECH CO LTD
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Problems solved by technology
On the one hand, this creates a certain loss of electrical energy; on the other hand, some applications do not allow this voltage to exist
For example: when driving LED lights, if the set output voltage is slightly higher than the input voltage, even if the output of the BOOST topology circuit does not boost, the LED lights at the output will still be slightly bright, which will seriously affect the customer experience
[0004] In addition, when the input terminal is a battery device, if the shutdown voltage and startup voltage of the BOOST power chip are designed to be the same voltage value, since the load on the battery drops after the BOOST power chip is shut down, the battery voltage will rise, causing the BOOST power chip to restart. , repeating the above process, which in turn will cause the output voltage of the output terminal to fluctuate continuously, and even cause problems such as system damage
Method used
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Embodiment Construction
[0025] In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below with reference to specific embodiments.
[0026] The embodiment of the present invention first provides a BOOST boost power supply system, please refer to figure 1 , including a power supply circuit 20 , an output circuit 30 and a BOOST under-voltage shutdown output circuit 10 . One end of the BOOST under-voltage shutdown output circuit 10 is connected to the power supply circuit 20 , and the other end of the BOOST under-voltage shutdown output circuit 10 is connected to the output circuit 30 .
[0027] In this embodiment, the power supply circuit 20 includes an input filter capacitor CIN, and the input filter capacitor CIN is connected in parallel between the system input terminal VIN and the GND terminal.
[0028] The output circuit 30 includes a first feedback resistor RT, a second feedback resistor RB, an output filter capacitor COUT...
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The invention provides an under-voltage turn-off output module, a BOOST power supply chip and a boost power supply system, and relates to the technical field of switching power supplies.According to relationship among the voltage of the VIN input voltage, the power-on voltage set threshold value and the power-off voltage set threshold value, corresponding control signals are generated through an internal voltage setting module, a voltage amplification module, a driving control signal generation module and an on-off control module, so that when the BOOST power supply chip is in a shutdown state, a PMOS tube externally connected with a PGATE signal output end is controlled to be turned off; and when the BOOST power supply chip is in a power-on state, the PMOS tube externally connected with the PGATE signal output end is controlled to be switched on. Therefore, the function of under-voltage turn-off output in the BOOST topological circuit is realized.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to an undervoltage shutdown output module, a BOOST power supply chip and a boosted power supply system. Background technique [0002] For the BOOST topology circuit, even if the power tube does not switch, the output terminal can be connected to the input terminal through the energy storage inductor and the freewheeling diode, so that the output terminal has a slightly lower voltage than the input terminal. That is to say, even if the BOOST power supply chip is in the off state, the output terminal cannot boost the voltage, but there will still be a voltage slightly lower than the input terminal. [0003] In normal applications, when the BOOST power chip is turned off, the voltage value at the output of the BOOST topology circuit is not what we want. On the one hand, this creates a certain loss of electrical energy; on the other hand, some applications do not allow...
Claims
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IPC IPC(8): H02H7/12H02M3/157
CPCH02H7/1213H02M3/157
Inventor 许锦龙李瑞平刘彬
Owner SHANGHAI XINLONG SEMICON TECH CO LTD