CN218829227U

CN218829227U - Main and standby power switching circuit with alarm function and standby circuit thereof

Info

Publication number: CN218829227U
Application number: CN202220776649.2U
Authority: CN
Inventors: 杭华; 许景涛
Original assignee: Baiyi Lighting Shanghai Holdings Ltd
Current assignee: Baiyi Lighting Shanghai Holdings Ltd
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2023-04-07
Anticipated expiration: 2032-04-06

Abstract

The application discloses main standby power switching circuit with alarm function and standby power circuit thereof, the main circuit comprises a main circuit input unit, at least one first diode, an output unit and a feedback unit, the anode of the first diode is electrically connected with the main circuit input unit, the cathode of the first diode is connected with the output unit, the feedback unit forms an access end for use, the feedback unit comprises a second diode, the cathode of the second diode is electrically connected with the output unit and the cathode of the first diode, the standby circuit of the main standby power switching circuit with alarm function comprises a standby power input unit, a control unit and a relay, the control unit comprises a main power access point, a voltage stabilizing diode and a triode, the cathode of the voltage stabilizing diode is connected in parallel with the collector of the triode, the anode of the voltage stabilizing diode is connected in parallel with the base of the triode, the main power connection point is connected between the cathode of the first diode of the main circuit and the cathode of the second diode, and the control unit further comprises a current control diode.

Description

Main and standby power switching circuit with alarm function and standby circuit thereof

Technical Field

The utility model relates to an alarm circuit especially relates to a main and standby electricity switching circuit and standby circuit with alarm function.

Background

Fire emergency lighting systems are used in many fields. Most of the existing fire-fighting emergency lighting systems are audible and visual alarms. Namely, the alarm generates a certain decibel sound and a preset intensity light to form an alarm signal.

The fire-fighting emergency lighting system is an emergency lighting device which is arranged for guiding trapped people to evacuate or developing fire-fighting rescue actions after a fire disaster occurs. In order to ensure timely alarm in case of an accident, two power supply modes are usually set on the circuit design of the fire emergency lighting system. One is an alternating current power supply mode, and the other is a battery power supply mode, so that a main and standby power supply is formed. When the emergency lighting system works, the alternating current is normally supplied, but once the alternating current is cut off or fails due to an accident, the standby battery power supply mode is started, so that the fire-fighting emergency lighting system can give an alarm in time.

The existing main-standby power switching mode structure is usually complex. For example, when some existing main and standby power switches are used, some precision elements such as an MCU or a feedback circuit are needed. However, after the general knowledge of MCU is used for a long time, there is a possibility that an error is reported. The conventional feedback circuit is complicated in design, and for example, the output feedback module and the input feedback module provided in the patent with the application number of 2210921325.9 are complicated in design.

SUMMERY OF THE UTILITY MODEL

An advantage of the utility model is that a main electric switch circuit and stand-by circuit with alarm function is provided, main electric switch circuit adopts less electronic components to stand-by with alarm function, and can cooperate with main electric circuit, can realize the warning of alarm when main electric circuit does not have the input.

Another advantage of the utility model is that a main and standby electricity switching circuit and stand-by circuit with alarm function is provided, main and standby electricity switching circuit with alarm function's simple structure, the cost of manufacture is low.

Another advantage of the utility model is that a main and standby electricity change-over circuit and stand-by circuit with alarm function is provided, wherein the main and standby electricity change-over circuit with alarm function can be when main electric circuit is not, realizes the output through the strong on-off that sets up.

For reaching the utility model discloses above at least one advantage, the utility model provides a main electricity switching circuit that stands by for with alarm function, the main electricity switching circuit that stands by for with alarm function includes:

the main circuit comprises a main circuit input unit, at least one first diode, an output unit and a feedback unit, wherein the anode of the first diode is electrically connected with the main circuit input unit, the cathode of the first diode is connected with the output unit, the feedback unit forms an access end, and the feedback unit comprises a second diode, and the cathode of the second diode is electrically connected with the output unit and the cathode of the first diode;

the backup circuit comprises a backup input unit, a control unit and a relay, wherein the control unit comprises a main access point, a voltage stabilizing diode and a triode, wherein the cathode of the voltage stabilizing diode is connected in parallel with the collector of the triode, the anode of the voltage stabilizing diode is connected in parallel with the base of the triode, furthermore, the main access point is connected between the cathode of the first diode and the cathode of the second diode of the main circuit, the control unit further comprises a current control diode, wherein the cathode of the current control diode is connected in parallel with the cathode of the voltage stabilizing diode, wherein the anode of the current control diode is connected in series with the collector of the triode, the emitter of the triode and the anode of the voltage stabilizing diode are electrically connected to the digital ground, the relay is connected in parallel with the current control diode, the connection of the current control diode is electrically connected to the connection terminal of the feedback unit when the connection of the current control diode is normally open, and the relay is electrically connected to an alarm circuit when the connection terminal of the relay is normally closed, and the cathodes of the backup circuit and the voltage stabilizing diode and the relay are electrically connected to the alarm circuit when the connection terminal of the relay is normally closed.

According to the utility model discloses an embodiment, the control unit still includes a first divider resistance, wherein first divider resistance by with zener diode the positive pole is established ties the back, is connected electrically the triode the base to can realize the partial pressure.

According to an embodiment of the present invention, the control unit further comprises a second voltage divider resistor, wherein the second voltage divider resistor is connected in series to the anode of the zener diode, and is connected in parallel to the base of the triode and the emitter of the triode simultaneously, and is then connected to digital ground.

According to the utility model discloses an embodiment, the power supply circuit still includes a strong switch, wherein the strong switch set up in the power supply input unit with zener diode's negative pole with between accuse current diode's the negative pole.

According to another aspect of the present invention, there is provided a standby circuit of a main standby switching circuit having an alarm function, for being coupled to a main circuit, the main circuit including a main circuit input unit, at least a first diode, an output unit and a feedback unit, an anode of the first diode being electrically connected to the main circuit input unit, a cathode of the first diode being connected to the output unit, wherein the feedback unit forms an input terminal, the feedback unit including a second diode, a cathode of the second diode being electrically connected to the output unit and a cathode of the first diode, the standby circuit of the main standby switching circuit having the alarm function including a standby input unit, a control unit and a relay, the control unit including a main access point, a zener diode and a triode, wherein a cathode of the zener diode is connected in parallel to a collector of the triode, an anode of the zener diode is connected in parallel to a base of the triode, and further, the main connection point is connected to the cathode of the first diode and the cathode of the second diode, the control unit including a cathode of the zener diode being electrically connected to the collector of the triode in parallel, wherein the control unit is electrically connected to the cathode of the main circuit and the emitter of the zener diode in parallel to the triode, and the feedback unit is electrically connected to the cathode of the constant current input unit and the triode in parallel, wherein the feedback unit is connected to the emitter of the constant diode and the feedback unit when the constant diode is connected to the constant diode in parallel, the constant diode, is electrically connected to an alarm circuit, and the standby circuit and the cathodes of the zener diode and the current steering diode are electrically connected to the relay.

According to the utility model discloses an embodiment, two operational amplifier are set up to LM356 amplifier.

Drawings

Fig. 1 shows a circuit diagram of the main-standby power switching circuit having an alarm function.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms are not to be construed as limiting the invention.

It is understood that the terms "a" and "an" should be interpreted as meaning "at least one" or "one or more," i.e., that a quantity of one element may be one in one embodiment, while a quantity of another element may be plural in other embodiments, and the terms "a" and "an" should not be interpreted as limiting the quantity.

Referring to fig. 1, a main/standby power switching circuit and a standby circuit thereof with an alarm function according to a preferred embodiment of the present invention. The standby circuit 100 of the alarm can be matched with a main circuit 200 to realize the output of current and realize the alarm of the alarm when the main circuit 200 cannot work.

Specifically, the main/standby power switching circuit having an alarm function includes the standby circuit 100 and the main circuit 200. The main circuit 200 includes a main circuit input unit 21, at least one first diode 22 (D1 in fig. 1), and an output unit 23. The anode of the first diode 22 is electrically connected to the main circuit input unit 21. The cathode of the first diode 22 is connected to the output unit 23.

Further, the main circuit 200 further includes a feedback unit 24, wherein the feedback unit 24 forms an input end 241 for connecting with the standby circuit 100. The feedback unit 24 includes a second diode 242 (e.g., D2 in fig. 1). A cathode of the second diode 242 is electrically connected to the output unit 23 and a cathode of the first diode 22.

The standby power circuit 100 includes a standby power input unit 11, a control unit 12, and a relay 13. The control unit 12 includes a main power access point 121 (shown as Va), a zener diode 122, and a transistor 124, wherein the cathode of the zener diode 122 is connected in parallel to the collector of the transistor 124, and the anode of the zener diode 122 is connected in parallel to the base of the transistor 124. Furthermore, the main electrical contact 121 is connected between the cathode of the first diode 22 and the cathode of the second diode 242 of the main electrical circuit 200.

Further, the control unit 12 further includes a current-controlling diode 125, wherein a cathode of the current-controlling diode is connected in parallel to a cathode of the zener diode 122, and an anode of the current-controlling diode 125 is connected in series to a collector of the transistor 124. The emitter of the transistor 124 and the anode of the zener diode 122 are electrically connected to digital ground.

The relay 13 is connected in parallel to the current control diode 125. In addition, the normally open end of the relay 13 is electrically connected to the input end 241 of the feedback unit 24, and when the normally closed end of the relay 13 is connected, it is electrically connected to an alarm circuit 300.

The standby circuit 100 and the cathodes of the zener diode 122 and the cathode of the current control diode 125 are electrically connected to the relay 13.

It is worth mentioning that when the main circuit input unit 21 of the main circuit 200 is powered and the backup input unit 11 of the backup circuit 100 is normally connected, the voltage in the main circuit 200 reaches the main access point 121 of the backup circuit 100 through the first diode 22, and then the transistor 124 is turned on through the zener diode 122, so that the relay 13 is turned on, and the relay 13 is turned on to be normally connected. At this time, the voltage of the backup circuit 100 can reach the main power access point 121 through the second diode 242. However, since the voltage outputted from the standby circuit is supplied from the battery and the voltage supplied from the main electric circuit 200, which is not supplied from the normal operation circuit, is high, the standby circuit does not have a current output.

When there is no input from the main circuit input unit 21 of the main circuit 200, the relay 13 is still at the normally open end due to the latching structure of the relay 13, and the output is provided from the main circuit input unit 21 of the standby circuit 100. However, as the battery voltage is gradually reduced along with the extension of the discharging time, the voltage of the main power access point 121 is divided by the zener diode 122 and the transistor 124 cannot be maintained to be conducted, so that the relay is not powered and turns to a normally closed end, and the alarm circuit 300 is connected to enable the alarm circuit 300 to alarm.

That is to say, the main and standby power switching circuit with the alarm function adopts fewer electronic components, can be matched with the main circuit, and can realize the alarm of the alarm when the main circuit is not input.

Further, the control unit 12 further includes a first voltage dividing resistor 126, wherein the first voltage dividing resistor 126 is electrically connected to the base of the transistor 124 after being connected in series with the anode of the zener diode 122, so as to implement voltage division, thereby enabling the transistor 124 to be turned on and off rapidly.

Further, the control unit 12 further comprises a second voltage dividing resistor 127, wherein the second voltage dividing resistor 127 is connected in series with the anode of the zener diode 122, and is connected in parallel with the base of the transistor 124 and the emitter of the transistor, and is then connected to the digital ground. The second voltage divider 127 is provided to enable a voltage division of the control unit 12, thereby also enabling the transistor 124 to be turned on and off rapidly.

Preferably, the standby circuit 100 further includes a strong-start switch 14, wherein the strong-start switch 14 is disposed between the standby input unit 11 and the cathode of the zener diode 122 and the cathode of the current control diode 125.

When the main circuit 200 does not exist and only the standby circuit 100 exists, the strong-start switch 14 is pressed, the zener diode 122 is switched on to conduct the triode 124 through voltage division, the relay 13 is attracted to a normally open end from a normally closed end to output power, and the main power access point 121 also has power. The triode 124 is conducted through the zener diode 122 to form self-locking, and the output is kept powered.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The advantages of the present invention are complete and effective. The functional and structural principles of the present invention have been shown and described in the embodiments without departing from the principles, embodiments of the present invention may have any deformation or modification.

Claims

1. Main stand-by electricity switching circuit with alarm function, its characterized in that, main stand-by electricity switching circuit with alarm function includes:

the backup circuit comprises a backup input unit, a control unit and a relay, wherein the control unit comprises a main access point, a voltage stabilizing diode and a triode, wherein the cathode of the voltage stabilizing diode is connected in parallel with the collector of the triode, the anode of the voltage stabilizing diode is connected in parallel with the base of the triode, the main access point is connected between the cathode of the first diode and the cathode of the second diode of the main circuit, the control unit further comprises a current control diode, wherein the cathode of the current control diode is connected in parallel with the cathode of the voltage stabilizing diode, wherein the anode of the current control diode is connected in series with the collector of the triode, the emitter of the triode and the anode of the voltage stabilizing diode are electrically connected to the digital ground, the relay is connected in parallel with the current control diode, the access end of the relay is electrically connected to the access end of the feedback unit when the access end of the current control diode is connected to the normally open end, and the backup circuit, the cathode of the voltage stabilizing diode and the cathode of the current control diode are electrically connected to the relay when the access end of the relay is connected to the normally closed end.

2. The power switching circuit with alarm function as claimed in claim 1, wherein said control unit further comprises a first voltage dividing resistor, wherein said first voltage dividing resistor is connected in series with said anode of said zener diode and electrically connected to said base of said transistor for dividing voltage.

3. The main-standby power switching circuit with alarm function according to claim 2, wherein said control unit further comprises a second voltage dividing resistor, wherein said second voltage dividing resistor is connected in series with an anode of said zener diode and is connected in parallel with said base of said transistor and an emitter of said transistor at the same time, and is then connected to digital ground.

4. A main-standby power switching circuit with alarm function according to any one of claims 1 to 3, characterized in that said standby circuit further comprises a power-on switch, wherein said power-on switch is disposed between said standby input unit and the cathode of said zener diode and the cathode of said current-controlling diode.

5. A backup circuit for a main-backup power switching circuit with alarm function, for cooperation with a main circuit, said main circuit comprising a main circuit input unit, at least a first diode, an output unit and a feedback unit, the anode of said first diode being electrically connected to said main circuit input unit, the cathode of said first diode being connected to said output unit, wherein said feedback unit forms an access terminal, said feedback unit comprising a second diode, the cathode of said second diode being connected to said output unit and to the cathode of said first diode, characterized in that the backup circuit of said main-backup power switching circuit with alarm function comprises a backup power input unit, a control unit and a relay, said control unit comprising a main electrical access point, a voltage regulator diode and a triode, wherein the cathode of the zener diode is connected in parallel to the collector of the triode, the anode of the zener diode is connected in parallel to the base of the triode, and further, the main electrical connection point is connected between the cathode of the first diode and the cathode of the second diode of the main electrical circuit, the control unit further comprises a current control diode, wherein the cathode of the current control diode is connected in parallel to the cathode of the zener diode, wherein the anode of the current control diode is connected in series to the collector of the triode, the emitter of the triode and the anode of the zener diode are both electrically connected to digital ground, the relay is connected in parallel to the current control diode, the access normally open end of the relay is electrically connected to the access end of the feedback unit, and when the access end of the relay is connected to the normally closed end, the relay is electrically connected to an alarm circuit, the standby circuit and the cathodes of the zener diode and the cathode of the current steering diode are electrically connected to the relay.

6. The power backup circuit of a main power backup switching circuit with alarm function as claimed in claim 5, wherein said control unit further comprises a first voltage dividing resistor, wherein said first voltage dividing resistor is connected in series with said anode of said zener diode and is electrically connected to said base of said triode to realize voltage division.

7. The power backup circuit of a main-power backup switching circuit with alarm function as claimed in claim 6, wherein said control unit further comprises a second voltage dividing resistor, wherein said second voltage dividing resistor is connected in series with an anode of said zener diode and is connected in parallel with said base of said transistor and an emitter of said transistor at the same time, and is then connected to digital ground.

8. The power backup circuit of a main power switching circuit with an alarm function as claimed in any one of claims 5 to 7, further comprising a power-on switch, wherein the power-on switch is disposed between the power backup input unit and the cathode of the zener diode and the cathode of the current-controlling diode.