Undervoltage shutdown output module, boost power chip and boost power 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 that affect customer experience, system damage, and LED lights at the output terminal are dimly lit, etc.
Active Publication Date: 2021-09-17
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 in conjunction with specific embodiments.
[0026] The embodiment of the present invention firstly provides a BOOST step-up power supply system, please refer to figure 1 , including a power supply circuit 20 , an output circuit 30 and a BOOST undervoltage shutdown output circuit 10 . One end of the BOOST undervoltage shutdown output circuit 10 is connected to the power circuit 20 , and the other end of the BOOST undervoltage shutdown output circuit 10 is connected to the output circuit 30 .
[0027] In this embodiment, the power supply circuit 20 includes an input terminal filter capacitor CIN, and the input terminal 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 ...
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The invention provides an undervoltage shutdown output module, BOOST power supply chip and boost power supply system, relates to the technical field of switching power supplies, and is based on the relationship between the input voltage terminal voltage of VIN and the threshold value of the power-on voltage and the threshold value of the power-off voltage , through the internal voltage setting module, voltage amplification module, drive control signal generation module and on-off control module to generate corresponding control signals, so that when the BOOST power supply chip is in the shutdown state, the PMOS tube connected to the PGATE signal output terminal is controlled to be turned off; when When the BOOST power supply chip is in the power-on state, it controls the PMOS transistor connected to the output terminal of the PGATE signal to conduct. Thus, the function of undervoltage shutdown output in the BOOST topology 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