A switching power supply with input voltage undervoltage lockout function
A technology of undervoltage lockout and switching power supply, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., and can solve the problems of increasing chip area and cost, large power consumption, and complicated circuit structure. , to achieve the effect of saving chip area and cost, reducing circuit complexity, and avoiding the decline of driving ability
Inactive Publication Date: 2015-08-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The disadvantages of this kind of circuit design scheme are: first, it is necessary to realize the reference circuit and comparator circuit, the circuit structure is complex, and the power consumption is relatively large; second, in the background of a wide range of input voltage applications, additional withstand voltage devices are required to protect the undervoltage Each device in the lock circuit will not be broken down, which will increase the chip area and cost
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[0014] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] Aiming at the existing problems of the input voltage undervoltage lockout circuit in the existing switching power supply system, such as complex structure, many devices and large area, the present invention proposes a switching power supply with the function of input voltage undervoltage lockout, the specific circuit structure is as follows figure 1 As shown, including NMOS tubes M1, M2, M3, capacitors C1, C2, C3, COUT, diodes D1, D2, inductor L, linear voltage regulator module LVR, undervoltage lockout module UVLO, upper tube drive module HDR and control module CTRL. The specific connection relationship is as follows:
[0016] The power input terminal of the linear voltage regulator module LVR is connected with the chip external input power supply voltage VIN and the drain of the NMOS transistor M2, and its ...
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The invention relates to a switch power supply chip design technology and discloses a switch power supply with an input voltage undervoltage locking function. The switch power supply comprises a first NMOS (N-channel metal oxide semiconductor) tube, a second NMOS tube, a third NMOS tube, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first diode, a second diode, an inductor, a linear voltage stabilizer module, an undervoltage locking module, an upper tube driving module and a control module. The switch power supply can realize the undervoltage locking of an input voltage without need of a comparator and a reference voltage, so as to reduce the complex rate of a circuit; and because the undervoltage locking function of the input voltage is realized by repeatedly utilizing other high-voltage-resisting devices in the system, chip area and cost are saved.
Description
technical field [0001] The invention relates to a switching power supply chip design technology, in particular to a switching power supply integrated circuit with an input voltage undervoltage locking function. Background technique [0002] In order to make the switching power supply chip work normally and stably, its input voltage must be within a certain range, so as to ensure that the chip can provide stable and reliable power to the application system. When the input voltage is lowered, each module inside the chip works near the minimum working voltage at a lower input voltage, which is very likely to cause abnormal internal functions, resulting in unstable power supply, and may even have a serious impact on the application system. Moreover, when the input voltage is powered by a battery, an over-low discharge voltage is likely to cause over-discharge, which seriously endangers the life of the battery. Therefore, in order to delay the battery life and ensure the normal ...
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IPC IPC(8): H02M1/32H02M7/5387
Inventor 周泽坤刘德尚朱世鸿苟超许天辉张其营石跃明鑫王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA