CN114441026A - Switching value three-state output circuit of weighing instrument - Google Patents
Switching value three-state output circuit of weighing instrument Download PDFInfo
- Publication number
- CN114441026A CN114441026A CN202210370837.XA CN202210370837A CN114441026A CN 114441026 A CN114441026 A CN 114441026A CN 202210370837 A CN202210370837 A CN 202210370837A CN 114441026 A CN114441026 A CN 114441026A
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- Prior art keywords
- pole
- switching value
- resistor
- photoelectric coupler
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
- H03K3/3568—Multistable circuits
Abstract
The embodiment of the invention discloses a switching value three-state output circuit of a weighing instrument, which comprises an MCU (microprogrammed control Unit), a photoelectric coupler U1, a photoelectric coupler U2, a switching value output port, a triode Q1, a MOS (metal oxide semiconductor) tube Q2, a resistor R1, a resistor R3, a resistor R5 and a self-recovery fuse F1, wherein the MCU is respectively connected with and controls the photoelectric coupler U1 and the photoelectric coupler U2; the photoelectric coupler U1 is connected with the B pole of the triode Q1 through a resistor R3; the E pole of the triode Q1 is externally connected with 24V voltage, the B pole is externally connected with 24V voltage through a resistor R1, and the C pole is connected with the D pole of the MOS tube Q2 through a self-recovery fuse F1; the output end of the photoelectric coupler U1 is connected with the G pole of the MOS tube Q2; the S pole of the MOS transistor Q2 is grounded, and the G pole is grounded through a resistor R5; the switching value output port is connected to one end of a self-recovery fuse F1. The invention can simultaneously meet the requirements of high level output, low level output and high resistance state, and has the driving capability of reaching 500mA, and has the functions of overcurrent and overvoltage protection.
Description
Technical Field
The invention relates to the technical field of weighing instruments, in particular to a switching value three-state output circuit of a weighing instrument.
Background
The switching value port of traditional weighing instrument is high level output or low level output mostly, and even some instruments can high low level output but the driving capability of port is not high, can't drive heavy current load, often need increase other peripheral hardware and carry out the conversion.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a switching value tri-state output circuit of a weighing instrument, so as to satisfy the functions of high level output, low level output and high impedance.
In order to solve the technical problem, the embodiment of the invention provides a switching value three-state output circuit of a weighing instrument, which comprises an MCU, a photoelectric coupler U1, a photoelectric coupler U2, a switching value output port, a triode Q1, an MOS tube Q2, a resistor R1, a resistor R3, a resistor R5 and a self-recovery fuse F1, wherein the MCU comprises an IO port O1 and an IO port O2, and the IO port O1 and the IO port O2 are respectively connected with input ends of a control photoelectric coupler U1 and the photoelectric coupler U2; one pole of the output end of the photoelectric coupler U1 is grounded, and the other pole of the output end is connected with the B pole of the triode Q1 through a resistor R3; the E pole of the triode Q1 is externally connected with 24V voltage, the B pole is externally connected with 24V voltage through a resistor R1, and the C pole is connected with the D pole of the MOS tube Q2 through a self-recovery fuse F1; one pole of the output end of the photoelectric coupler U1 is externally connected with 5V voltage, and the other pole of the output end is connected with the G pole of the MOS tube Q2; the S pole of the MOS transistor Q2 is grounded, and the G pole is grounded through a resistor R5; the switching value output port is connected to one end of a self-recovery fuse F1.
Further, a self-recovery fuse F2 is included, and the switching value output port is connected to one end of the self-recovery fuse F1 through the self-recovery fuse F2.
Further, a TVS diode V1 is included, one end of the TVS diode V1 is grounded, and the other end is connected to a self-recovery fuse F2.
Further, the MOS transistor Q2 is an N-type MOS transistor, and the transistor Q1 is a PNP-type transistor.
The invention has the beneficial effects that: the invention can simultaneously meet the requirements of high level output, low level output and high resistance state, and has the driving capability of reaching 500mA, and has the functions of overcurrent and overvoltage protection.
Drawings
Fig. 1 is a circuit diagram of a switching value three-state output circuit of a weighing instrument according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the switching value tri-state output circuit of the weighing instrument in the embodiment of the present invention includes an MCU, a photocoupler U1, a photocoupler U2, a switching value output port, a transistor Q1, a MOS transistor Q2, a resistor R1, a resistor R3, a resistor R5, and a self-recovery fuse F1.
The MCU comprises an IO port O1 and an IO port O2, and an IO port O1 and an IO port O2 are respectively connected with one pole of the input ends of a control photoelectric coupler U1 and a control photoelectric coupler U2. The other poles of the input ends of the photocoupler U1 and the photocoupler U2 are respectively connected with 3.3V voltage through a resistor R2 and a resistor R4. One pole of the output end of the photoelectric coupler U1 is grounded, and the other pole of the output end is connected with the B pole of the triode Q1 through the resistor R3. And the photoelectric coupler U1 and the photoelectric coupler U2 are used for isolating the switching value output from the weighing instrument system, so that the anti-interference capability of the post processor is improved.
The E pole of the triode Q1 is externally connected with 24V voltage, the B pole is externally connected with 24V voltage of the weighing instrument through a resistor R1, and the C pole is connected with the D pole of the MOS tube Q2 through a self-recovery fuse F1; one pole of the output end of the photoelectric coupler U1 is externally connected with 5V voltage, and the other pole of the output end is connected with the G pole of the MOS tube Q2. The S pole of the MOS transistor Q2 is grounded, and the G pole is grounded through a resistor R5; the switching value output port is connected to one end of a self-recovery fuse F1.
Since the state of the IO port of the MCU is uncertain at the moment of booting, the transistor Q1 and the MOS transistor Q2 may be turned on simultaneously, which may cause the transistor Q1 or the MOS transistor Q2 to burn out, and the self-recovery fuse F1 mainly protects the transistor Q1 and the MOS transistor Q2 at this moment.
The IO port O1 of the MCU controls high-level output of the switching value OUT (switching value output port), and the IO port O2 of the MCU controls low-level output of the switching value.
When the IO port O1 is at a low level and the IO port O2 is at a high level, the rear stage of the photoelectric coupler U1, which conducts the photoelectric coupler U2, is cut off, the PNP triode Q1 is conducted, the NMOS transistor Q2 is cut off, and the switching value output port OUT1 outputs at a high level.
When the IO port O1 is at a high level and the IO port O2 is at a low level, the rear stage of the photoelectric coupler U1 is switched on when the rear stage of the photoelectric coupler U2 is switched on, the PNP triode Q1 is switched on, the NMOS transistor Q2 is switched on, and at this time, the switching value output port OUT is output at a low level.
When the IO port O1 is at a high level and the IO port O2 is also at a high level, the switching value output port is at a high impedance state at this time.
In one embodiment, the switching value three-state output circuit of the weighing instrument further comprises a self-recovery fuse F2, and the switching value output port is connected with one end of a self-recovery fuse F1 through a self-recovery fuse F2. The switching value three-state output circuit of the weighing instrument further comprises a TVS diode V1, one end of the TVS diode V1 is grounded, and the other end of the TVS diode V1 is connected with a self-recovery fuse F2.
The self-recovery fuse F2 and the TVS diode V1 mainly have negative overcurrent protection and overvoltage protection of switching value output, so that the phenomenon that a triode Q1 and a MOS (metal oxide semiconductor) tube Q2 are burnt out by large current generated by switching value short circuit due to the fact that a user connects wrong wires in the using process is prevented, and instantaneous high voltage generated in inductive load switching breaks down a triode Q1 and a MOS tube Q2.
In one embodiment, the MOS transistor Q2 is an N-type MOS transistor, and the transistor Q1 is a PNP-type transistor.
According to the invention, each switching value output port of the weighing instrument can be independently set to be in a high-level output state, a low-level output state or a high-resistance state, the switching value port is conveniently connected with a PNP load or an NPN load, the IO port cannot be burnt even if a field debugging engineer connects wrong wires, the functional diversity of the weighing instrument is improved, and the stability of the weighing instrument is also improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The switching value three-state output circuit of the weighing instrument is characterized by comprising an MCU, a photoelectric coupler U1, a photoelectric coupler U2, a switching value output port, a triode Q1, a MOS (metal oxide semiconductor) tube Q2, a resistor R1, a resistor R3, a resistor R5 and a self-recovery fuse F1, wherein the MCU comprises an IO port O1 and an IO port O2, and the IO port O1 and the IO port O2 are respectively connected with the input ends of a control photoelectric coupler U1 and the photoelectric coupler U2; one pole of the output end of the photoelectric coupler U1 is grounded, and the other pole of the output end is connected with the B pole of the triode Q1 through a resistor R3; the E pole of the triode Q1 is externally connected with 24V voltage, the B pole is externally connected with 24V voltage through a resistor R1, and the C pole is connected with the D pole of the MOS tube Q2 through a self-recovery fuse F1; one pole of the output end of the photoelectric coupler U1 is externally connected with 5V voltage, and the other pole of the output end is connected with the G pole of the MOS tube Q2; the S pole of the MOS transistor Q2 is grounded, and the G pole is grounded through a resistor R5; the switching value output port is connected to one end of a self-recovery fuse F1.
2. The switching value three-state output circuit of the weighing instrument as claimed in claim 1, further comprising a self-recovery fuse F2, wherein the switching value output port is connected to one end of the self-recovery fuse F1 through the self-recovery fuse F2.
3. The switching value tristate output circuit of a weighing instrument of claim 2 further comprising a TVS diode V1, wherein one end of TVS diode V1 is connected to ground and the other end is connected to a self-recovery fuse F2.
4. The switching value tristate output circuit of the weighing instrument of claim 1 wherein said MOS transistor Q2 is an N-type MOS transistor and said transistor Q1 is a PNP type transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210370837.XA CN114441026A (en) | 2022-04-11 | 2022-04-11 | Switching value three-state output circuit of weighing instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210370837.XA CN114441026A (en) | 2022-04-11 | 2022-04-11 | Switching value three-state output circuit of weighing instrument |
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| Publication Number | Publication Date |
|---|---|
| CN114441026A true CN114441026A (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210370837.XA Pending CN114441026A (en) | 2022-04-11 | 2022-04-11 | Switching value three-state output circuit of weighing instrument |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128127A (en) * | 1979-03-27 | 1980-10-03 | Kubota Ltd | Electronic weighing device |
| CN201607275U (en) * | 2010-02-11 | 2010-10-13 | 厦门大学 | Weighing display controller |
| CN103293949A (en) * | 2013-06-08 | 2013-09-11 | 杭州和利时自动化有限公司 | On-off output channel redundancy fault-tolerant control method and redundancy on-off output channels |
| CN107221914A (en) * | 2016-03-22 | 2017-09-29 | 董海龙 | Circuit overvoltage, overcurrent and superheat is protected |
| CN107835011A (en) * | 2017-11-22 | 2018-03-23 | 上海华力微电子有限公司 | A kind of high reliability tristate output circuit |
| CN208386141U (en) * | 2018-08-01 | 2019-01-15 | 深圳市雷赛控制技术有限公司 | output protecting device and terminal controller |
| CN109375536A (en) * | 2018-09-27 | 2019-02-22 | 郑州华力信息技术有限公司 | Multifunctional status amount detection module device |
-
2022
- 2022-04-11 CN CN202210370837.XA patent/CN114441026A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128127A (en) * | 1979-03-27 | 1980-10-03 | Kubota Ltd | Electronic weighing device |
| CN201607275U (en) * | 2010-02-11 | 2010-10-13 | 厦门大学 | Weighing display controller |
| CN103293949A (en) * | 2013-06-08 | 2013-09-11 | 杭州和利时自动化有限公司 | On-off output channel redundancy fault-tolerant control method and redundancy on-off output channels |
| CN107221914A (en) * | 2016-03-22 | 2017-09-29 | 董海龙 | Circuit overvoltage, overcurrent and superheat is protected |
| CN107835011A (en) * | 2017-11-22 | 2018-03-23 | 上海华力微电子有限公司 | A kind of high reliability tristate output circuit |
| CN208386141U (en) * | 2018-08-01 | 2019-01-15 | 深圳市雷赛控制技术有限公司 | output protecting device and terminal controller |
| CN109375536A (en) * | 2018-09-27 | 2019-02-22 | 郑州华力信息技术有限公司 | Multifunctional status amount detection module device |
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Application publication date: 20220506 |
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