A low power consumption load current detection circuit applied to pwm DC-DC converter
A PWMDC-DC, load current detection technology, used in high-efficiency power electronic conversion, AC/pulse peak measurement, output power conversion devices, etc.
Active Publication Date: 2022-02-11
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology
[0005] like figure 1 As shown, the traditional peak current detection circuit is also from V SW The difference is that the traditional peak current detection circuit is mostly used in the current mode control loop, and an additional compensation circuit is required. To apply the traditional peak current detection circuit to the voltage mode control loop, the problem to be solved is how to Obtain a stable current sampling signal, and facilitate subsequent processing while obtaining a stable signal during sampling
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[0020] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.
[0021] The technical scheme that the present invention solves the problems of the technologies described above is:
[0022] Such as figure 1As shown, it is a block diagram of the PWM Buck DC-DC system. In the figure, the power freewheeling PMOS transistor M1 and the power freewheeling NMOS transistor M2 are used as the freewheeling transistors of the Buck DC-DC, V SW The sampling signal as the peak current is received at the input end of the current detection circuit (dotted line box). The specific structure of the load current detection circuit is as follows: figure 2 As shown in the figure, it can be seen that it includes a peak current detection module ①, a sample and hold circuit ② and an analog-to...
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The invention claims protection of a low-power consumption load current detection circuit applied to a PWM DC-DC converter, which belongs to the field of microelectronics technology. Including peak current sensing module, sample and hold circuit, analog-to-digital conversion module, etc. The present invention adopts a peak current detection module, a sample and hold circuit, and an analog-to-digital conversion module, wherein the input terminal of the peak current detection module is connected to the drain level of the freewheeling tube through a switch tube, and then its output terminal is connected to the sample and hold circuit. The input is connected, and the output end of the sampling and holding circuit is connected with the input end of the analog-to-digital conversion circuit. The sample-and-hold circuit obtains a stable peak current signal through a switched capacitor, and converts it into a digital signal VS[0:3] through an analog-to-digital conversion module ③, and uses the change of the VS[0:3] signal to project changes in the load current.
Description
technical field [0001] The invention belongs to the technical field of integrated circuit design and relates to the design of a load current detection circuit applied to PWM DC-DC. Background technique [0002] The load current detection (Load Current Detection) circuit in the DC-DC converter is often used to monitor the change of the load current. Whether it is a current control mode or a multi-modulation voltage control mode, the load current detection circuit is a basic circuit module. . In order to make the processing of the control module more convenient and stable, it is usually also hoped that the change of the load current sampled by the load current detection circuit can be converted into a digital signal. [0003] Common current detection methods for switching power converters include peak current detection (Peak Current Detection) and average current detection (Average Current Detection). Peak current detection is a detection method that reflects the magnitude o...
Claims
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IPC IPC(8): H02M3/158G01R19/04
CPCH02M3/158G01R19/04H02M1/0012H02M1/0048H02M1/0009Y02B70/10
Inventor 赵汝法周怡袁军毛鼎昌王巍
Owner CHONGQING UNIV OF POSTS & TELECOMM