A Power Failure Indication Circuit Applied to DC-DC
A technology of DC-DC and indicating circuit, which is applied in the field of power failure indicating circuit, can solve problems such as large temperature change of hysteresis value, unstable output VOUT, and inability to identify or deal with the system in time, so as to achieve simple implementation and prevent false reversal Effect
Active Publication Date: 2021-06-08
BEIJING MXTRONICS CORP +1
View PDF9 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Part of the existing DC-DC converter circuit does not contain a fault indication circuit, so that once the output VOUT is unstable or power-off occurs during the application process, the system cannot identify or deal with it in time
Secondly, the comparison voltage accuracy of the fault indication circuit integrated in DC-DC is low, and the hysteresis value is realized by the internal comparator, which brings about the problem that the hysteresis value changes greatly with temperature, and the DC-DC is normal During the working process, the noise caused by the frequent switching of the internal power tube will lead to poor anti-interference ability of the comparison voltage
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0038] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0039] figure 1 It is a power supply fault indication circuit applied to DC-DC in the present invention, and the circuit includes a reference circuit, a DC-DC feedback network, and a fault comparator circuit, wherein:
[0040] The DC-DC feedback network receives the output voltage of the DC-DC, obtains the feedback voltage Vsense through resistor division, and sends the feedback voltage Vsense to the fault comparison voltage;
[0041]The reference circuit, under the action of the DC-DC power supply voltage, generates a reference voltage, and divides the reference voltage through a resistor to obtain four comparison voltage signals and sends them to the fault comparison circuit. The sequence is recorded as the first comparison voltage signal, the second comparison voltage signal, the third comparison voltage signal, and the fourth comparison ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a DC-DC power supply fault indication circuit, which includes a reference circuit, a DC-DC feedback network, and a fault comparator circuit, wherein: the DC-DC feedback network receives the output voltage of the DC-DC, and passes Divide the resistance to obtain the sensing voltage Vsense, and send the feedback voltage Vsense to the fault comparison voltage; the reference circuit generates a reference voltage, and divides the reference voltage to obtain four comparison voltage signals and sends them to the fault comparison circuit; the fault comparison circuit sends the feedback The voltage Vsense is compared with the first comparison voltage signal, the second comparison voltage signal, the third comparison voltage signal, and the fourth comparison voltage signal, and the feedback voltage Vsense is lower than the second comparison voltage or higher than the fourth comparison voltage during the rising process. voltage, or is lower than the first comparison voltage or higher than the third comparison voltage during the falling process, and outputs a "valid" fault flag signal. The invention can effectively monitor the output voltage change of the DC-DC voltage drop switching power supply.
Description
technical field [0001] The invention relates to a power failure indicating circuit of a DC-DC switch converter, especially used in switching power supplies which require high output voltage precision and wide operating temperature range. Background technique [0002] The output of the DC-DC switching converter is often used as the power supply for the entire system. The stability of the DC-DC output voltage directly affects the working status of the entire system. Therefore, it is necessary to design a power failure circuit to monitor the output voltage failure in real time. [0003] In system applications, in order to detect the status of the system power supply in real time, it is necessary to add a power monitoring chip in the system construction. For the overall system, it not only increases the overall power consumption, but also increases the area, which is not in line with the miniaturization and The development needs of low power consumption. Part of the existing DC...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/40
CPCG01R31/40
Inventor 宋奎鑫孔瀛莫艳图张志伟胡贵才王秀芝李卓康磊苏彦强阳启明曲绍贤柏晓鹤胡文瑞王佳刘睿晨
Owner BEIJING MXTRONICS CORP