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CN-224233553-U - Power supply circuit for short circuit detection

CN224233553UCN 224233553 UCN224233553 UCN 224233553UCN-224233553-U

Abstract

The application relates to the technical field of circuit detection, and discloses a power supply circuit for short circuit detection. The power supply circuit comprises a single chip microcomputer, a constant current source circuit, a voltage detection circuit, a direct current power supply circuit and a product to be tested, wherein the input end of the constant current source circuit is respectively connected with an external power supply and a first output port of the single chip microcomputer, the output end of the constant current source circuit is connected with the input end of the voltage detection circuit and the first output port of the product to be tested, the output end of the voltage detection circuit is connected with a detection input port of the single chip microcomputer, the input end of the direct current power supply circuit is respectively connected with the external power supply and a second output port of the single chip microcomputer, and the output end of the direct current power supply circuit is connected with the product to be tested. The application simplifies the existing open-short circuit detection mode, can realize whether the impedance of the power supply is short-circuited or not firstly when the high-density PCBA and the chip are electrified for the first time, realizes the judgment and the preliminary screening of the open-short circuit of the power supply, and simultaneously avoids the conditions that the short circuit fires or burns out test equipment or burns out products to be tested after the short circuit is directly electrified.

Inventors

  • Miao Hanzhan

Assignees

  • 东莞记忆存储科技有限公司

Dates

Publication Date
20260512
Application Date
20250326

Claims (8)

  1. 1. The power supply circuit for short circuit detection is characterized by comprising a singlechip, a constant current source circuit, a voltage detection circuit, a direct current power supply circuit and a product to be detected; The input end of the constant current source circuit is respectively connected with an external power supply and a first output port of the singlechip, and the output end of the constant current source circuit is connected with the input end of the voltage detection circuit and a product to be detected; the output end of the voltage detection circuit is connected with the detection input port of the singlechip; the input end of the direct current power supply circuit is respectively connected with an external power supply and the second output port of the singlechip, and the output end of the direct current power supply circuit is connected with the product to be tested.
  2. 2. The power supply circuit for short circuit detection according to claim 1, wherein the constant current source circuit comprises a power switch and a constant current source, the input end of the power switch is respectively connected with an external power supply and the first output port of the single chip microcomputer, the output end of the power switch is connected with the positive electrode of the constant current source, and the negative electrode of the constant current source is connected with the input end of the voltage detection circuit and a product to be detected.
  3. 3. The power supply circuit for short circuit detection according to claim 1, wherein the direct current power supply circuit comprises a direct current power supply, an input end of the direct current power supply is respectively connected with an external power supply and a second output port of the single chip microcomputer, and an output end of the direct current power supply is connected with a product to be detected.
  4. 4. A power supply circuit for short circuit detection according to claim 3, wherein the dc power supply circuit further comprises a first capacitor, and two ends of the first capacitor are connected to an external power supply and ground, respectively.
  5. 5. A power supply circuit for short circuit detection according to claim 3, wherein the dc power supply circuit further comprises a first inductor, and two ends of the first inductor are respectively connected to the output end of the dc power supply and the product to be tested.
  6. 6. The power supply circuit for short circuit detection according to claim 5, wherein the dc power supply circuit further comprises a first resistor and a second resistor, one end of the first resistor is connected to the first inductor, the other end of the first resistor is connected to the output end of the dc power supply and one end of the second resistor, and the other end of the second resistor is grounded.
  7. 7. The power supply circuit for short circuit detection according to claim 5, wherein the dc power supply circuit further comprises a second capacitor, one end of the second capacitor is connected to the first inductor and the external output voltage, respectively, and the other end of the second capacitor is grounded.
  8. 8. A power supply circuit for short circuit detection according to claim 2, characterized in that the power switch is PMOS.

Description

Power supply circuit for short circuit detection Technical Field The application relates to the technical field of circuit detection, in particular to a power supply circuit for short circuit detection. Background In the PCBA production process, a first power-up operation must be performed after each product is manufactured, so as to check whether the product functions normally, wherein it is a critical task to detect whether a power short condition exists in the product. In industry practice, optical inspection (AOT) or ICT equipment is typically used to open and close short circuits for PCBA products, while expensive ATE equipment is used to perform such inspection for chip products. There are a number of problems associated with the detection techniques currently on the market. For example, optical detection and X-ray detection are not only expensive but also limited in detection accuracy, they rely on visual recognition only, lack an electrical signal detection link, and thus it is difficult to accurately measure and remove abnormal defects such as short circuits and open circuits. The on-line flying probe detection (ICT) works by contacting the probe with the measuring point on the PCBA, has the advantages of high detection precision and comprehensive signal coverage, but has clear requirements on the size of the measuring point, so that the high-density PCBA and the chip cannot be designed for reserving the measuring point. Although Automatic Test Equipment (ATE) can realize full-function inspection of chips, the ATE has the defects of high equipment cost, low test efficiency and capacity requirement cannot be met when the ATE is in face of mass production. Therefore, the cost of the current detection means in these industries is generally high. Especially, like SSD products, ICT test cannot be adopted because of small volume and high device density and no redundant space at all for reserving test points. Disclosure of utility model The application aims to solve the technical problem of providing a power supply circuit for short circuit detection, which simplifies the existing open-short circuit detection mode, can realize that the high-density PCBA and a chip detect whether the power supply impedance is short-circuited for the first time when the power is on, realize the judgment and the primary screening of the open-short circuit of the power supply, and simultaneously avoid the condition that short circuit ignition or burning test equipment or burning products to be tested occur after the direct power on of the short circuit. In order to solve the problems, the application provides a power supply circuit for short circuit detection, which comprises a single chip microcomputer, a constant current source circuit, a voltage detection circuit, a direct current power supply circuit and a product to be detected, wherein the input end of the constant current source circuit is respectively connected with an external power supply and a first output port of the single chip microcomputer, the output end of the constant current source circuit is connected with the input end of the voltage detection circuit and the product to be detected, the output end of the voltage detection circuit is connected with a detection input port of the single chip microcomputer, the input end of the direct current power supply circuit is respectively connected with the external power supply and a second output port of the single chip microcomputer, and the output end of the direct current power supply circuit is connected with the product to be detected. Preferably, the constant current source circuit comprises a power switch and a constant current source, wherein the input end of the power switch is respectively connected with an external power supply and the first output port of the single chip microcomputer, the output end of the power switch is connected with the positive electrode of the constant current source, and the negative electrode of the constant current source is connected with the input end of the voltage detection circuit and a product to be detected. Preferably, the direct current power supply circuit comprises a direct current power supply, wherein the input end of the direct current power supply is respectively connected with an external power supply and the second output port of the singlechip, and the output end of the direct current power supply is connected with a product to be tested. Preferably, the direct current power supply circuit further comprises a first capacitor, and two ends of the first capacitor are respectively connected with an external power supply and the ground. Preferably, the direct current power supply circuit further comprises a first inductor, and two ends of the first inductor are respectively connected with the output end of the direct current power supply and a product to be tested. Preferably, the dc power supply circuit further includes a first resistor and a second resistor, one