CN115036903A - Digital weighing sensor misconnection prevention protection circuit - Google Patents
Digital weighing sensor misconnection prevention protection circuit Download PDFInfo
- Publication number
- CN115036903A CN115036903A CN202210561518.7A CN202210561518A CN115036903A CN 115036903 A CN115036903 A CN 115036903A CN 202210561518 A CN202210561518 A CN 202210561518A CN 115036903 A CN115036903 A CN 115036903A
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- CN
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- Prior art keywords
- weighing sensor
- power supply
- schottky diodes
- digital weighing
- port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
The invention discloses a wrong connection prevention protection circuit of a digital weighing sensor, which comprises a lead port of the digital weighing sensor, two Schottky diodes and a TVS diode, wherein the lead port of the digital weighing sensor comprises a signal wiring port and a power supply wiring port; the group of power supply wiring ports, the Schottky diodes and the filter circuit form a loop, 15V power is supplied among the Schottky diodes, the signal wiring ports are connected with the TVS diodes in the forward direction and then grounded, the signal wiring ports are respectively connected with current-limiting resistors in series and then connected with pull-up resistors to be connected with a signal input end of a communication chip, and the connection mode can effectively avoid the condition that the weighing sensor is burnt out due to wrong connection of the power supply direction; through adopting the 15V power supply between two schottky diodes can reduce the discharge current of TVS diode thereby protect TVS diode when the misconnection, and this voltage is less than communication chip withstand voltage characteristic requirement simultaneously, can effectively protect communication chip.
Description
Technical Field
The invention belongs to the technical field of sensor safety protection, and particularly relates to a misconnection prevention protection circuit for a digital weighing sensor.
Background
With the high-speed development of the logistics industry, the requirements on automation and intellectualization of production management are higher and higher, a digital weighing sensor is an indispensable important component in the logistics industry, the conventional four-wire digital weighing sensor has a positive wire and a negative wire of a power supply and a two wire of an RS485 signal, the possibility of connecting wrong wires exists in 23 types, and when the positive electrode of the power supply is connected to other wires in a wrong way (the negative electrode of the power supply, RS485A and RS485B) and can form a loop with the negative electrode of the power supply, the sensor can be burnt out, so that the weighing sensor is scrapped.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a wrong connection prevention protection circuit of a digital weighing sensor, which specifically comprises the following steps:
a lead port of a digital weighing sensor; the lead wire ports of the digital weighing sensor comprise a group of signal wiring ports and a group of power supply wiring ports;
two schottky diodes (D1, D2); the Schottky diodes (D1, D2) forming a loop with the power connection port and a filter circuit;
TVS diode Z1; the signal wiring port is connected with the TVS diode Z1 in the forward direction and then grounded, and the signal wiring port is respectively connected with a current limiting resistor (R1, R2) in series and then connected with a pull-up resistor (R19, R20) to be connected with a signal input end of a communication chip U4.
Further, a power chip U2 is connected between the two Schottky diodes (D1, D2) and used for supplying power to the signal wiring port.
Preferably, 15V is adopted between the two Schottky diodes (D1, D2) for power supply, the 15V voltage can reduce the discharge current of the TVS diode Z1 so as to protect the TVS diode Z1 when the misconnection is convenient, and the 15V voltage is lower than the requirement of the withstand voltage characteristic of the communication chip U4 so as to effectively protect the communication chip U4.
Preferably, the current limiting resistors (R1, R2) adopt 10 omega resistors and are used for limiting current when a power supply is misconnected.
The invention has the beneficial effects that:
the situation that the weighing sensor is burnt out due to the fact that the power supply direction is connected in a wrong mode can be effectively avoided;
the 15V power supply is adopted between the two Schottky diodes, so that the discharge current of the TVS diode can be reduced when misconnection occurs, the TVS diode is protected, meanwhile, the voltage is lower than the voltage-resistant characteristic requirement of the communication chip U4, and the communication chip U4 can be effectively protected.
Drawings
FIG. 1 is a schematic diagram of an anti-misconnection protection circuit according to the present invention;
reference numerals: the digital weighing sensor comprises a lead port TP of the digital weighing sensor, Schottky diodes D1-D2, a TVS diode Z1, current-limiting resistors R1-R2, pull-up resistors R19-R20, a power supply chip U2 and a communication chip U4.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The same reference numbers will be used throughout the drawings to refer to the same or like parts.
Example 1
As shown in fig. 1, a digital weighing sensor misconnection prevention protection circuit includes: the device comprises a lead port of a digital weighing sensor, two Schottky diodes (D1 and D2) and a TVS diode Z1, wherein the lead port of the digital weighing sensor comprises a group of signal wiring ports (RS485A and RS485B) and a group of power wiring ports (positive and negative power supplies);
the power supply wiring ports (the positive electrode and the negative electrode of the power supply) form a loop with the Schottky diodes (D1, D2) and the filter circuit, 15V power supply is adopted between the two Schottky diodes (D1, D2), the 15V voltage can reduce the discharge current of the TVS diode Z1 when misconnection is facilitated, so that the TVS diode Z1 is protected, meanwhile, the 15V voltage is lower than the requirement of the withstand voltage characteristic of the communication chip U4, and the communication chip U4 can be effectively protected;
the group of signal wiring ports (RS485A and RS485B) are connected with the TVS diode Z1 in the forward direction and then grounded, the signal wiring ports are respectively connected with current-limiting resistors (R1 and R2) in series and then connected with pull-up resistors (R19 and R20) to be accessed to a signal input end of a communication chip U4, and the communication chip U4 is connected with a CPU for communication to complete data transmission.
Specifically, the communication chip U4 is an RS485 communication chip (model number is SN65HVD 3088).
Specifically, the filter circuit is composed of a resistor R9 and a capacitor C15, and the filter circuit is externally connected with an electrolytic capacitor E1.
The working principle is as follows:
firstly, when a worker connects the positive pole of a power supply to the negative pole of the power supply by mistake, the Schottky diode D1 can prevent the inflow of the power supply by utilizing the one-way conduction characteristic of the diode;
secondly, when workers mistakenly connect the positive electrode of the power supply to the signal connection port (RS485A or RS485B), the clamping characteristic (clamping 12V) of the TVS diode Z1 is utilized to clamp the power supply within the safe voltage range of the RS485 chip, and meanwhile, the current limiting characteristic of the current limiting resistor (R1, R2) is utilized to effectively protect the RS485 chip.
Example 2
Based on embodiment 1, a power chip U2 (model LM2841) can be externally connected between the two schottky diodes (D1, D2) for reducing the 15V level to 5.5V, which is convenient for supplying power to the communication chip U4.
Specifically, the current limiting resistors (R1, R2) may be 10 Ω resistors, and are used for limiting current when the power supply is misconnected.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (4)
1. A kind of digital weighing sensor defends the wrong connection protective circuit, characterized by, comprising:
a lead port of a digital weighing sensor; the lead wire ports of the digital weighing sensor comprise a group of signal wiring ports and a group of power supply wiring ports;
two Schottky diodes (D1, D2); the Schottky diodes (D1, D2) forming a loop with the power connection port and a filter circuit;
a TVS diode (Z1); the signal wiring port is connected with the TVS diode (Z1) in the forward direction and then is grounded, and the signal wiring port is connected with the current-limiting resistors (R1 and R2) in series and then is connected with the pull-up resistors (R19 and R20) to be connected with the signal input end of the communication chip (U4).
2. The digital load cell mis-connection protection circuit as claimed in claim 1, wherein a power chip (U2) is connected between the two Schottky diodes (D1, D2).
3. The digital load cell mis-connection protection circuit as claimed in claim 1, wherein a 15V power supply is provided between the two schottky diodes (D1, D2).
4. The digital load cell misconnection protection circuit of claim 1, wherein said current limiting resistor (R1, R2) is a 10 Ω resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210561518.7A CN115036903A (en) | 2022-05-23 | 2022-05-23 | Digital weighing sensor misconnection prevention protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210561518.7A CN115036903A (en) | 2022-05-23 | 2022-05-23 | Digital weighing sensor misconnection prevention protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115036903A true CN115036903A (en) | 2022-09-09 |
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ID=83121914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210561518.7A Pending CN115036903A (en) | 2022-05-23 | 2022-05-23 | Digital weighing sensor misconnection prevention protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115036903A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115540990A (en) * | 2022-09-20 | 2022-12-30 | 河北美衡电子科技股份有限公司 | Digital weighing sensor |
-
2022
- 2022-05-23 CN CN202210561518.7A patent/CN115036903A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115540990A (en) * | 2022-09-20 | 2022-12-30 | 河北美衡电子科技股份有限公司 | Digital weighing sensor |
| CN115540990B (en) * | 2022-09-20 | 2023-09-05 | 河北美衡电子科技股份有限公司 | Digital weighing sensor |
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