CN217240327U - Two-wire system fire control bus non-polarity conversion circuit - Google Patents
Two-wire system fire control bus non-polarity conversion circuit Download PDFInfo
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- CN217240327U CN217240327U CN202220727128.8U CN202220727128U CN217240327U CN 217240327 U CN217240327 U CN 217240327U CN 202220727128 U CN202220727128 U CN 202220727128U CN 217240327 U CN217240327 U CN 217240327U
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Abstract
The application discloses two-wire system fire control bus nonpolarity converting circuit includes: the power supply comprises a first power supply input end, a second power supply input end, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first diode, a power supply output end anode and a power supply output end cathode; the anode of the first diode is connected with the first power supply input end, and the cathode of the first diode is connected with the anode of the power supply output end; the grid electrode of the first MOS tube is connected with the first power supply input end, the source electrode of the first MOS tube is connected with the negative electrode of the power supply output end, and the drain electrode of the first MOS tube is connected with the positive electrode of the power supply output end; the grid electrode of the second MOS tube is connected with the second power supply input end, the source electrode of the second MOS tube is grounded, and the drain electrode of the first MOS tube is connected with the first power supply input end. The problem of when having solved fire control construction wiring, connect the polarity of wrong line easily is solved, allows nonpolarity to connect, has reduced the construction degree of difficulty and product hidden danger.
Description
Technical Field
The application relates to a two-wire fire-fighting bus product, in particular to a two-wire fire-fighting bus non-polarity conversion circuit.
Background
At present, a fire protection system generally uses two buses (referring to a connection form shared by an electric wire and a signal wire) as a fire protection line, the two buses usually include a main line and a branch line, wherein the main line is connected with a fire protection controller, the branch line is connected with detection devices such as a smoke detector and a temperature detector, and in order to ensure that the detection devices can work independently and between the fire protection controller and the detection devices, a bus isolator is usually installed between the main line and the branch line to avoid that the branch line devices influence the working states of other devices on the main line when overcurrent or short circuit occurs.
However, the input polarity of serial data communication of the electric device, the battery and various devices powered by the direct current for fire fighting is fixed, the input connection must be strictly defined according to the input positive and negative polarities of the electric device to access the direct current power supply, if the positive and negative electrodes of the direct current power supply are reversely connected with the positive input end and the negative input end of the electric device, the external device cannot be normally powered, and even the battery, the power supply or the external device is seriously damaged.
SUMMERY OF THE UTILITY MODEL
The technical problem that this application will be solved provides a two-wire system fire control bus nonpolarity converting circuit, when having solved fire control construction wiring, connects the problem of the polarity of wrong line easily, allows nonpolarity to connect, has reduced the construction degree of difficulty and product hidden danger.
The technical scheme adopted by the application is as follows: two-wire system fire control bus nonpolarity converting circuit includes:
the power supply comprises a first power supply input end, a second power supply input end, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first diode, a power supply output end anode and a power supply output end cathode;
the anode of the first diode is connected with the first power supply input end, and the cathode of the first diode is connected with the anode of the power supply output end;
the grid electrode of the first MOS tube is connected with the first power supply input end, the source electrode of the first MOS tube is connected with the negative electrode of the power supply output end, and the drain electrode of the first MOS tube is connected with the positive electrode of the power supply output end;
the grid electrode of the second MOS tube is connected with the second power supply input end, the source electrode of the second MOS tube is grounded, and the drain electrode of the first MOS tube is connected with the first power supply input end.
Compared with the prior art, the power supply polarity switching circuit has the advantages that the first MOS tube and the second MOS tube are arranged, the polarity of the power supply is automatically switched over by switching on and off the first MOS tube and the second MOS tube in the circuit, the power supply input end of the electric equipment can be adaptively and randomly connected with the positive electrode and the negative electrode of the direct-current power supply, normal work of the electric equipment is guaranteed, and the electric equipment and the power supply are prevented from being damaged. When fire control construction wiring, reduced the construction degree of difficulty and product hidden danger. And the whole circuit structure is simple in design, and the production cost of the product is effectively reduced.
In some embodiments of the present application, the present application includes a bi-directional transient diode having a first end coupled to the first power input and a second end coupled to the second power input. The two-way transient diode is mainly used for protecting a power supply and a signal circuit, is suitable for the two-wire fire-fighting bus non-polar conversion circuit and plays a role in static electricity prevention.
In some embodiments of the present application, the gate of the first MOS transistor is connected to the first power input terminal through a twenty-first resistor, two ends of the twenty-first resistor are connected in parallel to a fourteenth diode, the anode of the fourteenth diode is connected to the gate of the first MOS transistor, and the cathode of the fourteenth diode is connected to the first power input terminal.
In some embodiments of the present application, the gate and the source of the first MOS transistor are connected through a first capacitor, and a twenty-second resistor is connected in parallel to two ends of the first capacitor.
In some embodiments of the present application, the drain of the first MOS transistor is connected to the positive electrode of the power output terminal through a second diode, the positive electrode of the second diode is connected to the drain of the first MOS transistor, and the negative electrode of the second diode is connected to the positive electrode of the power output terminal.
In some embodiments of the present application, the gate of the second MOS transistor is connected to the second power input terminal through a twenty-third resistor, one end of a twenty-third resistor is connected to the gate of the second MOS transistor, the other end of the twenty-third resistor is connected to the anode of the second diode, and the other end of the twenty-third resistor is connected to the second power input terminal.
In some embodiments of the present application, a fifteenth diode is connected in parallel to two ends of the twenty-third resistor, an anode of the fifteenth diode is connected to the gate of the second MOS transistor, and a cathode of the fifteenth diode is connected to the second power input terminal.
In some embodiments of the present application, the gate and the source of the second MOS transistor are connected through a second capacitor, and two ends of the second capacitor are connected in parallel with a twenty-fourth resistor.
Drawings
The present application will be described in further detail below with reference to the drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of illustrating the preferred embodiments and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are merely schematic representations based on conceptual representations of elements or structures depicted and may contain exaggerated displays and are not necessarily drawn to scale.
Fig. 1 is a circuit diagram of the present application.
Detailed Description
The present application will now be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in 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 present application and are not intended to limit the present application.
As shown in fig. 1: two-wire system fire control bus nonpolarity converting circuit includes: a first power input end T1, a second power input end T2, a first MOS tube Q7, a second MOS tube Q8, a first diode D1, a power output end anode com + and a power output end cathode TP 1;
the anode of the first diode D1 is connected with the first power input end T1, and the cathode of the first diode D1 is connected with the anode com + of the power output end; the grid electrode of the first MOS tube Q7 is connected with a first power input end T1, the source electrode of the first MOS tube Q7 is connected with the cathode TP1 of the power output end, and the drain electrode of the first MOS tube Q7 is connected with the anode com + of the power output end; the grid electrode of the second MOS tube Q8 is connected with the second power input end T2, the source electrode of the second MOS tube Q8 is grounded, and the drain electrode of the first MOS tube Q7 is connected with the first power input end T1.
Specifically, the first MOS transistor Q7 and the second MOS transistor Q8 both adopt NMOS transistors.
The input end of the circuit can be connected to the positive pole and the negative pole of the power supply at will, so that normal work of the electric equipment is guaranteed, and the electric equipment and the power supply are prevented from being damaged. Compared with the existing polarity conversion circuit, the input polarity of the electric device is mostly converted through the rectifier bridge, so that the electric device can normally work when the positive electrode and the negative electrode of the battery are reversely connected. However, since the diode of the rectifier bridge has large power loss during operation and reduces the power conversion efficiency, the polarity conversion circuit using the rectifier bridge is not suitable for battery-powered devices and communication devices. In addition, it requires a power-consuming device operating under low voltage and large current conditions, and has a complicated design process and low operating efficiency. Based on this, provide two-wire system fire control bus nonpolarity converting circuit of this application embodiment to solve the automatic conversion of polarity of power output circuit, ensure equipment normal work.
The present application includes a bi-directional transient diode having a first terminal coupled to the first power input terminal T1 and a second terminal coupled to the second power input terminal T2.
The gate of the first MOS transistor Q7 is connected to the first power input terminal T1 through a twenty-first resistor R21, a fourteenth diode D14 is connected in parallel to two ends of the twenty-first resistor R21, the anode of the fourteenth diode D14 is connected to the gate of the first MOS transistor Q7, and the cathode of the fourteenth diode D14 is connected to the first power input terminal T1.
The gate and the source of the first MOS transistor Q7 are connected through a first capacitor C1, and a twenty-second resistor R22 is connected in parallel at two ends of the first capacitor 1C.
The drain of the first MOS transistor Q7 is connected to the positive pole com + of the power output terminal through a second diode D2, the positive pole of the second diode D2 is connected to the drain of the first MOS transistor Q7, and the negative pole of the second diode D2 is connected to the positive pole com + of the power output terminal.
The grid of the second MOS transistor Q8 is connected with the second power input terminal T2 through a twenty-third resistor R23, one end of a twenty-third resistor R23 is connected with the grid of the second MOS transistor Q8, the other end of the twenty-third resistor R23 is connected with the positive electrode of the second diode D2, and the other end of the twenty-third resistor R23 is connected with the second power input terminal T2.
Two ends of the twenty-third resistor R23 are connected in parallel with a fifteenth diode D15, an anode of the fifteenth diode D15 is connected to a gate of the second MOS transistor Q8, and a cathode of the fifteenth diode D15 is connected to the second power input terminal T2.
The gate and the source of the second MOS transistor Q8 are connected through a second capacitor C2, and two ends of the second capacitor C2 are connected in parallel with a twenty-fourth resistor R24.
No matter which way the power/communication line is interfaced with the first power input terminal T1 and the second power input terminal T2, the positive pole com + and the negative pole TP1 of the power output terminal are always output. The two MOS tubes Q7 and Q8 can realize the automatic switching of the polarity of the input power supply/communication line, and the circuit has simple structure and high reliability. The on-resistance of the selected MOS tube is extremely small, so that the voltage drop between the source electrode and the drain electrode of each MOS tube is extremely small, the input voltage and the output voltage of the circuit are approximately equal, and the lossless output of the level is ensured.
The present application has been described in detail, and the principles and embodiments of the present application have been described herein using specific examples, which are provided only to help understand the present application and its core concept. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. Two-wire system fire control bus nonpolarity converting circuit, its characterized in that includes:
the power supply comprises a first power supply input end, a second power supply input end, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a first diode, a power supply output end anode and a power supply output end cathode;
the anode of the first diode is connected with the first power supply input end, and the cathode of the first diode is connected with the anode of the power supply output end;
the grid electrode of the first MOS tube is connected with the first power supply input end, the source electrode of the first MOS tube is connected with the negative electrode of the power supply output end, and the drain electrode of the first MOS tube is connected with the positive electrode of the power supply output end;
the grid electrode of the second MOS tube is connected with the second power supply input end, the source electrode of the second MOS tube is grounded, and the drain electrode of the first MOS tube is connected with the first power supply input end.
2. The two-wire fire protection bus non-polarity-switching circuit of claim 1, wherein the circuit comprises a bi-directional transient diode, a first end of the bi-directional transient diode is coupled to the first power input, and a second end of the bi-directional transient diode is coupled to the second power input.
3. The two-wire fire fighting bus non-polarity switching circuit according to claim 1, wherein the gate of the first MOS transistor is connected to the first power input terminal through a twenty-first resistor.
4. The two-wire fire control bus non-polarity switching circuit according to claim 3, wherein a fourteenth diode is connected in parallel to two ends of the twenty-first resistor, an anode of the fourteenth diode is connected to the gate of the first MOS transistor, and a cathode of the fourteenth diode is connected to the first power input terminal.
5. The two-wire fire fighting bus non-polarity switching circuit according to claim 1 or 3, wherein the gate and the source of the first MOS transistor are connected through a first capacitor, and a twenty-second resistor is connected in parallel at two ends of the first capacitor.
6. The two-wire fire fighting bus non-polarity switching circuit according to claim 1, wherein a drain of the first MOS transistor is connected to a positive electrode of the power output terminal through a second diode, a positive electrode of the second diode is connected to the drain of the first MOS transistor, and a negative electrode of the second diode is connected to the positive electrode of the power output terminal.
7. The two-wire fire protection bus non-polarity switching circuit according to claim 6, wherein a gate of the second MOS transistor is connected to the second power input terminal through a thirteenth resistor.
8. The two-wire fire fighting bus non-polarity switching circuit according to claim 7, wherein one end of a twenty-third resistor is connected to the gate of the second MOS transistor, the other end of the twenty-third resistor is connected to the anode of the second diode, and the other end of the twenty-third resistor is connected to the second power input terminal.
9. The two-wire fire control bus non-polarity switching circuit according to claim 7, wherein a fifteenth diode is connected in parallel to two ends of the twenty-third resistor, an anode of the fifteenth diode is connected to a gate of the second MOS transistor, and a cathode of the fifteenth diode is connected to the second power input terminal.
10. The two-wire fire-fighting bus non-polarity switching circuit according to claim 1, wherein a gate and a source of the second MOS transistor are connected through a second capacitor, and a twenty-fourth resistor is connected in parallel to two ends of the second capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727128.8U CN217240327U (en) | 2022-03-31 | 2022-03-31 | Two-wire system fire control bus non-polarity conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220727128.8U CN217240327U (en) | 2022-03-31 | 2022-03-31 | Two-wire system fire control bus non-polarity conversion circuit |
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| Publication Number | Publication Date |
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| CN217240327U true CN217240327U (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220727128.8U Active CN217240327U (en) | 2022-03-31 | 2022-03-31 | Two-wire system fire control bus non-polarity conversion circuit |
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| CN (1) | CN217240327U (en) |
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- 2022-03-31 CN CN202220727128.8U patent/CN217240327U/en active Active
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