CN113381377A - Massage armchair load short-circuit protection circuit - Google Patents
Massage armchair load short-circuit protection circuit Download PDFInfo
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- CN113381377A CN113381377A CN202011028331.8A CN202011028331A CN113381377A CN 113381377 A CN113381377 A CN 113381377A CN 202011028331 A CN202011028331 A CN 202011028331A CN 113381377 A CN113381377 A CN 113381377A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Abstract
The invention discloses a massage chair load short-circuit protection circuit, which comprises R6, R3, R1 and U1B, wherein one end of R6 is connected with a GND end, and the other end is connected with a source electrode of Q1; the drain of Q1 is connected with the positive electrode of D1, and the gate of Q1 is connected with the INPUT terminal; the negative electrode of the D1 is connected with the VM end, the output can be stopped at the moment of short circuit of the load end, so that open fire caused by instant heating is avoided, the damage of a control panel is also avoided, the bad proportion in the production process caused by the open fire is reduced, and the potential safety hazard of firing caused by short circuit of the load at an end user is also reduced.
Description
Technical Field
The invention relates to the field of short-circuit protection, in particular to a massage armchair load short-circuit protection circuit.
Background
The fire prevention problem of the massage chair is always a difficult problem which troubles manufacturers. The accident of firing of past massage armchair has a major part to be caused by the unexpected short circuit of load part, for example the vibration leads to the screw to drop to the circuit board, and the pencil misplaces and receives the extrusion and cause the crust damaged in assembling process, and load end interface terminal is not hard up scheduling problem, all can produce the short circuit problem, does not have appropriate protect function, probably can lead to the accident of firing.
Disclosure of Invention
Aiming at the problems, the invention provides a massage chair load short-circuit protection circuit, which is skillfully designed by using a few circuits, so that a high-power output end of a driving circuit can bear direct short circuit without firing, elements are not damaged, and fire hazard caused by load short circuit is avoided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the transistor comprises R6, R3, R1 and U1B, wherein one end of R6 is connected to a GND end, and the other end of R6 is connected with a source electrode of Q1; the drain of Q1 is connected with the positive electrode of D1, and the gate of Q1 is connected with the INPUT terminal; the negative electrode of the D1 is connected with the VM end; the port 1 of the J1 electric motor is connected with the connecting line of the D1 and the VM end, and the port 2 is connected with the connecting line of the Q1 and the D1; the positive pole of D2 is connected to the connecting line of Q1 and INPUT, and the negative pole of D2 is connected to the DETECT end; one end of R4 is connected with the connection line of R6 and Q1, and the other end is connected with a pin 7 on a comparator U1B; one end of the C3 is connected with a connecting line of the R6 and the GND end, and the other end is connected with a connecting line of the R4 and a pin 7 on the comparator U1B; pin 1 of the comparator U1B is connected with the base of Q3; the collector of Q3 is connected to the DETECT terminal and the emitter is connected to the GND terminal.
Furthermore, one end of C1 is connected with VCC pin, and the other end is connected with GND end; one end of R3 is connected with one end of R1, and the other end is connected with a VCC pin; the other end of R1 is connected to the GND terminal; the pin 6 of the comparator U1B is connected with the connecting line of R3 and R1.
Furthermore, the collector of the Q4 is connected with the connecting line of the pin 1 of the comparator U1B and the Q3, the emitter is connected with the GND end, and the base of the Q4 is connected with the RESET end; one end of the C2 is connected to the connection line between the pin 1 of the comparator U1B and the Q3, and the other end is connected to the connection line between the Q4 and the GND terminal.
Furthermore, the emitter of the Q2 is connected to the VCC pin, the base is connected to the connection line of the Q3 and the DETECT terminal, and the collector is connected to one end of the R5.
Further, the other end of R5 is connected to the connection between R4 and pin 7 of comparator U1B.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
according to the massage chair load short-circuit protection circuit, output can be stopped at the moment of short circuit of the load end, so that open fire caused by instant heating is avoided, damage to the control panel is avoided, the bad proportion in the production process caused by the open fire is reduced, and the potential safety hazard of firing due to load short circuit of a terminal user is reduced.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a massage chair load short-circuit protection circuit, which includes R6, R3, R1, and U1B, wherein one end of R6 is connected to GND terminal, and the other end is connected to the source of Q1; the drain of Q1 is connected with the positive electrode of D1, and the gate of Q1 is connected with the INPUT terminal; the negative electrode of the D1 is connected with the VM end; the port 1 of the J1 electric motor is connected with the connecting line of the D1 and the VM end, and the port 2 is connected with the connecting line of the Q1 and the D1; the positive pole of D2 is connected to the connecting line of Q1 and INPUT, and the negative pole of D2 is connected to the DETECT end; one end of R4 is connected with the connection line of R6 and Q1, and the other end is connected with a pin 7 on a comparator U1B; one end of the C3 is connected with a connecting line of the R6 and the GND end, and the other end is connected with a connecting line of the R4 and a pin 7 on the comparator U1B; pin 1 of the comparator U1B is connected with the base of Q3; the collector of Q3 is connected with the DETECT end, and the emitter is connected with the GND end; one end of the C1 is connected with the VCC pin, and the other end is connected with the GND end; one end of R3 is connected with one end of R1, and the other end is connected with a VCC pin; the other end of R1 is connected to the GND terminal; the pin 6 of the comparator U1B is connected with the connecting line of R3 and R1; the collector of Q4 is connected with the connecting line of pin 1 of comparator U1B and Q3, the emitter is connected with GND end, the base of Q4 is connected with RESET end; one end of the C2 is connected with a connecting line of a pin 1 on the comparator U1B and the Q3, and the other end is connected with a connecting line of the Q4 and the GND end; the emitter of Q2 is connected with VCC pin, the base is connected with the connecting line of Q3 and DETECT end, the collector is connected with one end of R5; the other end of R5 is connected to the connection between R4 and pin 7 of comparator U1B.
The working process of the protection circuit of the invention is as follows: the main components for detecting load short circuit are R6, R3, R1 and U1B, wherein R3 and R1 form a voltage divider circuit to set a protection threshold of the short circuit current, which is provided to the negative input terminal (inverting input terminal) of the comparator U1B (i.e. operational amplifier with open-drain output), and R6 is used to measure the short circuit current flowing through, and filtered by R4 and C3 to the positive input terminal (inverting input terminal) of the comparator U1B. When the short-circuit current of the U1B is larger than a set threshold value, the output is inverted, R2 and C2 raise the voltage, then Q3 is conducted, and the collector of Q3 generates a protection low level. The protection level (low level) of the collector of Q3 is provided to three locations simultaneously, as detailed below:
first, pulling the gate of Q1 low directly via D2, i.e., turning off the output of Q1, overrides the INPUT signal, and forces the load off.
Secondly, the high-level feedback is provided for the Q2 and the collector output of the Q2 is fed back to the U1B, so that the self-locking effect is achieved, and the endless oscillation effect between the protection action and the short-circuit action is avoided.
Thirdly, the short-circuit protection is provided for the MCU through the DETECT, the MCU DETECTs that the short-circuit protection works, appropriate prompt information can be made to a user, the protection circuit can be tried to RESET again at intervals, namely, the Q4 is switched on by first pulling high and then pulling low through RESET, and the normal working state is recovered if the short-circuit state is relieved. This signal is optional and the protection is still valid even if the MCU is not notified.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. The utility model provides a massage armchair load short-circuit protection circuit which characterized in that: the transistor comprises R6, R3, R1 and U1B, wherein one end of R6 is connected to a GND end, and the other end of R6 is connected with a source electrode of Q1; the drain of Q1 is connected with the positive electrode of D1, and the gate of Q1 is connected with the INPUT terminal; the negative electrode of the D1 is connected with the VM end; the port 1 of the J1 electric motor is connected with the connecting line of the D1 and the VM end, and the port 2 is connected with the connecting line of the Q1 and the D1; the positive pole of D2 is connected to the connecting line of Q1 and INPUT, and the negative pole of D2 is connected to the DETECT end; one end of R4 is connected with the connection line of R6 and Q1, and the other end is connected with a pin 7 on a comparator U1B; one end of the C3 is connected with a connecting line of the R6 and the GND end, and the other end is connected with a connecting line of the R4 and a pin 7 on the comparator U1B; pin 1 of the comparator U1B is connected with the base of Q3; the collector of Q3 is connected to the DETECT terminal and the emitter is connected to the GND terminal.
2. The massage chair load short-circuit protection circuit as claimed in claim 1, wherein: one end of the C1 is connected with the VCC pin, and the other end is connected with the GND end; one end of R3 is connected with one end of R1, and the other end is connected with a VCC pin; the other end of R1 is connected to the GND terminal; the pin 6 of the comparator U1B is connected with the connecting line of R3 and R1.
3. The massage chair load short-circuit protection circuit as claimed in claim 1, wherein: the collector of Q4 is connected with the connecting line of pin 1 of comparator U1B and Q3, the emitter is connected with GND end, the base of Q4 is connected with RESET end; one end of the C2 is connected to the connection line between the pin 1 of the comparator U1B and the Q3, and the other end is connected to the connection line between the Q4 and the GND terminal.
4. The massage chair load short-circuit protection circuit as claimed in claim 1, wherein: the emitter of Q2 is connected to VCC pin, the base is connected to the connection line of Q3 and DETECT terminal, and the collector is connected to one end of R5.
5. The massage chair load short-circuit protection circuit of claim 4, wherein: the other end of R5 is connected to the connection between R4 and pin 7 of comparator U1B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028331.8A CN113381377A (en) | 2020-09-26 | 2020-09-26 | Massage armchair load short-circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011028331.8A CN113381377A (en) | 2020-09-26 | 2020-09-26 | Massage armchair load short-circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113381377A true CN113381377A (en) | 2021-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011028331.8A Pending CN113381377A (en) | 2020-09-26 | 2020-09-26 | Massage armchair load short-circuit protection circuit |
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| Country | Link |
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| CN (1) | CN113381377A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593961A (en) * | 2009-07-07 | 2009-12-02 | 中国科学技术大学 | DC power supply short-circuit protection circuit based on contactless current sample |
| CN103427810A (en) * | 2013-08-07 | 2013-12-04 | 深圳清华大学研究院 | Signal generator circuit |
| CN208479164U (en) * | 2018-07-12 | 2019-02-05 | 东莞朗勤电子科技有限公司 | A kind of over-current detection protection circuit and electronic cigarette |
-
2020
- 2020-09-26 CN CN202011028331.8A patent/CN113381377A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593961A (en) * | 2009-07-07 | 2009-12-02 | 中国科学技术大学 | DC power supply short-circuit protection circuit based on contactless current sample |
| CN103427810A (en) * | 2013-08-07 | 2013-12-04 | 深圳清华大学研究院 | Signal generator circuit |
| CN208479164U (en) * | 2018-07-12 | 2019-02-05 | 东莞朗勤电子科技有限公司 | A kind of over-current detection protection circuit and electronic cigarette |
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Application publication date: 20210910 |