CN113556853A - Composite intrinsic safety circuit - Google Patents
Composite intrinsic safety circuit Download PDFInfo
- Publication number
- CN113556853A CN113556853A CN202110951177.XA CN202110951177A CN113556853A CN 113556853 A CN113556853 A CN 113556853A CN 202110951177 A CN202110951177 A CN 202110951177A CN 113556853 A CN113556853 A CN 113556853A
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- unit
- resistor
- composite
- mcu control
- light source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/20—Responsive to malfunctions or to light source life; for protection
- H05B47/25—Circuit arrangements for protecting against overcurrent
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a composite intrinsic safety circuit which comprises an input end, an LED light source unit, an LDO power supply and protection unit, an MCU control unit, a key unit, an MOS tube unit and a current-limiting resistance unit, wherein the current-limiting resistance unit comprises at least one group of resistance modules formed by connecting a plurality of resistors in parallel, and the resistance modules are connected in series between the MOS tube unit and the LED light source unit. The LED light source circuit is reasonable in structural layout, the MOS tube unit, the current-limiting resistor unit and the LED light source unit form a main loop, the current-limiting resistor unit comprises one or more groups of resistor modules formed by connecting a plurality of resistors in parallel, and the working current of the LED light source unit is limited by the resistors in the resistor modules, so that the current requirement of short-circuit faults of the intrinsic safety circuit is met, the use safety is effectively improved, and the MOS tube circuit is simple in structure, low in cost, easy to implement and beneficial to wide popularization and application.
Description
Technical Field
The invention relates to the technical field of intrinsic safety circuits, in particular to a composite intrinsic safety circuit.
Background
With the rapid development of industries such as petroleum, chemical industry, mining industry and the like, the lighting lamp is more and more widely used in production, storage and rescue, and the variety is more and more. How to prevent the lighting lamp from the accidental explosion in the explosive gas dangerous place is an important subject. Since the lighting fixtures inevitably produce electric sparks or form glowing surfaces during operation, they can cause explosion accidents once they meet the explosive gas mixture in the production or rescue site, directly endangering the lives of the citizens and the property safety of the country.
The explosion-proof lamp is used in dangerous places where combustible gas and dust exist, and can prevent electric arcs, sparks and high temperature possibly generated in the lamp from igniting the combustible gas and dust in the surrounding environment, so that the explosion-proof lamp can meet the explosion-proof requirement. Also called explosion-proof lamps and lanterns, explosion-proof light. Different flammable gas mixture environments have different requirements on the explosion-proof grade and the explosion-proof form of the explosion-proof lamp, and specific references are GB3836 and IEC 60079. In order to meet the relevant requirements of explosion-proof lamps, a composite intrinsic safety circuit needs to be developed.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a composite intrinsically safe circuit with good safety effect.
In order to achieve the purpose, the invention provides the technical scheme that: a composite intrinsic safety circuit comprises an input end, an LED light source unit, an LDO power supply and protection unit, an MCU control unit, a key unit, an MOS tube unit and a current-limiting resistor unit, wherein the LDO power supply and protection unit provides stable working voltage for the MCU control unit; the current-limiting resistance unit comprises at least one group of resistance modules formed by connecting a plurality of resistors in parallel, and the resistance modules are connected in series between the MOS tube unit and the LED light source unit.
As a preferable scheme of the invention, the LDO power supply and protection unit includes a regulated LDO chip U2, a diode D1, a fuse F1, a resistor R1a, and a resistor R1b, and the diode D1, the fuse F1, the resistor R1a, the resistor R1b, and the regulated LDO chip U2 are sequentially connected. The type of the voltage regulation LDO chip U2 is preferably HT 7550.
As a preferred aspect of the present invention, the MCU control unit includes an MCU control chip U1 and resistors R4, R5, R6, R7, and R8 electrically connected to the 8 th, 9 th, 10 th, 11 th, and 12 th pins of the MCU control chip U1. The model of the MCU control chip is preferably SOP 14.
As a preferable scheme of the present invention, the MOS transistor unit includes a plurality of MOS transistors, gates of the MOS transistors are respectively connected to the resistors R4, R5, R6, R7, and R8 electrically connected to the 8 th to 12 th pins of the MCU control chip, sources of the MOS transistors are connected to the input terminal, and drains of the MOS transistors are connected to the LED light source unit.
In a preferred embodiment of the present invention, the LED light source unit includes a plurality of LED lamps, and the resistor module is connected in series between the LED lamps.
As a preferred scheme of the present invention, the 13 th pin of the MCU control chip is electrically connected to a voltage detection circuit.
As a preferable embodiment of the present invention, the voltage detection circuit includes a sampling resistor R2 and a sampling resistor R3, the other end of the sampling resistor R2 is connected to the voltage terminal of the input terminal, and the other end of the sampling resistor R3 is connected to the ground terminal of the input terminal.
In a preferred embodiment of the present invention, the key of the key unit is connected to the other end of the sampling resistor R3 and the capacitor C1.
The invention has the beneficial effects that: the LED light source circuit is reasonable in structural layout, the MOS tube unit, the current-limiting resistor unit and the LED light source unit form a main loop, the current-limiting resistor unit comprises one or more groups of resistor modules formed by connecting a plurality of resistors in parallel, and the working current of the LED light source unit is limited by the resistors in the resistor modules, so that the current requirement of short-circuit faults of the intrinsic safety circuit is met, the use safety is effectively improved, and the MOS tube circuit is simple in structure, low in cost, easy to implement and beneficial to wide popularization and application.
The invention is further illustrated by the following figures and examples.
Drawings
FIG. 1 is a block diagram of a composite intrinsically safe circuit of the present invention.
Fig. 2 is a circuit diagram of the composite intrinsically safe circuit of the present invention.
Detailed Description
Example (b): referring to fig. 1 and 2, the present invention provides a composite intrinsically safe circuit, which includes an input terminal 1, an LED light source unit 7, an LDO power supply and protection unit 2, an MCU control unit 3, a key unit 5, an MOS transistor unit 6, and a current limiting resistor unit 5. The LED light source unit 7 includes a plurality of LED lamps. In this embodiment, the LED light source unit 7 includes LED lamps 1 to 10.
The LDO power supply and protection unit 2 provides stable working voltage for the MCU control unit 3, the LDO power supply and protection unit 2 comprises a voltage-stabilizing LDO chip U2, a diode D1, a fuse F1, a resistor R1a and a resistor R1b, and the diode D1, the fuse F1, the resistor R1a, the resistor R1b and the voltage-stabilizing LDO chip U2 are sequentially connected. The type of the voltage-stabilizing LDO chip U2 is preferably HT7550, and the voltage-stabilizing LDO chip U2 is used for converting 10-14V voltage into 5.0V voltage, and has the characteristics of low cost, low power consumption, low voltage drop and low quiescent current. And a 5.0V voltage output end of the voltage-stabilizing LDO chip U2 is connected with a filter capacitor C2 and a VDD pin of the MCU control chip U1. And the input end 1 of the voltage-stabilizing LDO chip U2 is connected with a filter capacitor C1.
The MCU control unit 3 is connected with a key unit 5 and an MOS tube unit 6, and the MCU control unit 3 receives a pressing signal of the key unit 5 and then outputs a PWM signal to the MOS tube unit 6 to correspondingly control the on and off of the LED light source unit 7; the current limiting resistor unit 5 includes at least one resistor module formed by connecting a plurality of resistors in parallel, in this embodiment, the resistors R10-R69 are connected in parallel and then connected in series to form thirteen resistor modules. Each resistor module is connected in series between the MOS tube unit 6 and the LED lamp and between two adjacent LED lamps.
The MCU control unit 3 comprises an MCU control chip U1 and resistors R4, R5, R6, R7 and R8. The model of the MCU control chip is preferably SOP 14. The resistor R4 is electrically connected with the 8 th terminal pin of the MCU control chip U1; the resistor R5 is electrically connected with the 9 th terminal pin of the MCU control chip U1; the resistor R6 is electrically connected with the 10 th terminal pin of the MCU control chip U1; the resistor R7 is electrically connected with the 11 th terminal pin of the MCU control chip U1; the resistor R8 is electrically connected with the 12 th terminal pin of the MCU control chip U1;
the MOS transistor unit 6 includes a plurality of MOS transistors, in this embodiment, the number of the MOS transistors is five, and the MOS transistors Q1-Q5. Referring to fig. 2, the gate of the MOS transistor Q1 is electrically connected to the resistor R7; the gate of the MOS transistor Q2 is electrically connected with the resistor R6; the gate of the MOS transistor Q3 is electrically connected with the resistor R8; the gate of the MOS transistor Q4 is electrically connected with the resistor R4; the gate of the MOS transistor Q5 is electrically connected with the resistor R7; and 8 th to 12 th terminal pins of the MCU control chip U1 are correspondingly connected with and control MOS transistors Q1 to Q5 through resistors R4 to R8. The sources of the MOS transistors Q1-Q5 are all connected to the DC-of the input terminal 1, i.e. the ground terminal, and the drains of the MOS transistors Q1-Q5 are connected to the LED light source unit 7. The LED lamps 1-10, the resistors R10-R69 and the MOS transistors Q1-Q5 are correspondingly connected one by one to form a main circuit of the circuit.
Preferably, a voltage detection loop is electrically connected to the 13 th pin of the MCU control chip. The voltage detection loop comprises a sampling resistor R2 and a sampling resistor R3, the other end of the sampling resistor R2 is connected with the DC +, namely the voltage end, of the input end 1, and the other end of the sampling resistor R3 is connected with the DC-, namely the grounding end, of the input end 1. The 1 st pin of the key in the key unit 5 is electrically connected to a ground terminal, and is electrically connected to the other ends of the capacitor C1 and the sampling resistor R3, respectively.
When the device works, the LDO power supply and protection unit 2 provides stable working voltage for the MCU control unit 3; the MCU control unit 3 is connected with a key unit 5 and an MOS tube unit 6, and the MCU control unit 3 receives a key pressing signal and then outputs a PWM signal to the MOS tube unit 6 so as to control the on and off of the LED light source unit 7. The working current of the LED light source unit 7 is limited through the resistor in the resistor module, so that the current requirement of the short-circuit fault of the intrinsic safety circuit is met, and the use safety is effectively improved.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. In addition, although specific terms are used herein, they are used for convenience of description and are not to be construed as limiting the invention in any way, and other circuits similar or identical thereto are also within the scope of the invention.
Claims (10)
1. A composite intrinsic safety circuit comprises an input end and an LED light source unit, and is characterized by comprising an LDO power supply and protection unit, an MCU control unit, a key unit, an MOS tube unit and a current-limiting resistor unit, wherein the LDO power supply and protection unit provides stable working voltage for the MCU control unit; the current-limiting resistance unit comprises at least one group of resistance modules formed by connecting a plurality of resistors in parallel, and the resistance modules are connected in series between the MOS tube unit and the LED light source unit.
2. The composite intrinsically safe circuit of claim 1, wherein the LDO power supply and protection unit comprises a voltage regulator LDO chip, a diode, a fuse and a resistor, and the diode, the fuse, the resistor and the voltage regulator LDO chip are connected in sequence.
3. The composite intrinsically safe circuit of claim 2, wherein the regulator LDO chip is HT 7550.
4. The composite intrinsically safe circuit of claim 1, wherein the MCU control unit comprises an MCU control chip and resistors electrically connected to 8 th to 12 th pins of the MCU control chip, respectively.
5. The composite intrinsically safe circuit of claim 4, wherein the MCU control chip is of the type SOP 14.
6. The composite intrinsically safe circuit of claim 5, wherein the MOS transistor unit comprises a plurality of MOS transistors, gates of the MOS transistors are connected with resistors electrically connected with 8 th to 12 th terminal pins of the MCU control chip, sources of the MOS transistors are connected with the input end, and drains of the MOS transistors are connected with the LED light source unit.
7. A composite intrinsically safe circuit as claimed in claim 6, wherein the LED light source unit comprises a plurality of LED lamps, and the resistor modules are connected in series between the LED lamps.
8. The composite intrinsically safe circuit of claim 6, wherein the 13 th pin of the MCU control chip is electrically connected with a voltage detection loop.
9. The composite intrinsically safe circuit of claim 8, wherein the voltage detection circuit comprises a sampling resistor R2 and a sampling resistor R3, the other end of the sampling resistor R2 is connected to the voltage terminal of the input terminal, and the other end of the sampling resistor R3 is connected to the ground terminal of the input terminal.
10. A composite intrinsically safe circuit as claimed in claim 9, wherein the keys of the key unit are connected to the other terminal of the sampling resistor R3 and the capacitor C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110951177.XA CN113556853A (en) | 2021-08-18 | 2021-08-18 | Composite intrinsic safety circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110951177.XA CN113556853A (en) | 2021-08-18 | 2021-08-18 | Composite intrinsic safety circuit |
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| Publication Number | Publication Date |
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| CN113556853A true CN113556853A (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110951177.XA Pending CN113556853A (en) | 2021-08-18 | 2021-08-18 | Composite intrinsic safety circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023208008A1 (en) * | 2022-04-28 | 2023-11-02 | 嘉兴山蒲照明电器有限公司 | Led driving power supply, illumination light source for refrigerator and illumination device |
-
2021
- 2021-08-18 CN CN202110951177.XA patent/CN113556853A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023208008A1 (en) * | 2022-04-28 | 2023-11-02 | 嘉兴山蒲照明电器有限公司 | Led driving power supply, illumination light source for refrigerator and illumination device |
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