UPS power supply for elevator car

Abstract

The utility model relates to the field of power supplies, in particular to a UPS (Uninterrupted Power Supply) for an elevator car, which comprises a mains supply interface, a rectification filter circuit, a transformation circuit, a storage battery and a mains supply detection circuit, the voltage transformation circuit is connected with the rectification filter circuit, and a first direct-current voltage output end of the voltage transformation circuit is connected with a call alarm bell in an elevator car through an equipment power supply end to supply power; the storage battery is connected with the equipment power supply end through the battery connecting end, the discharge switch circuit and the booster circuit in sequence; a second direct-current voltage output end of the transformation circuit is connected with the storage battery through the battery connecting end; the mains supply detection circuit is connected with the mains supply interface and used for conducting the discharge switch circuit when no mains supply is detected so that the storage battery can supply power to the equipment power supply end through the booster circuit. According to the utility model, switching between commercial power supply and storage battery power supply can be realized only through cooperation of the commercial power detection circuit and the discharge switch circuit, the circuit is simple, and the reliability is high.

Description

Technical Field

[0001] The utility model relates to the field of power supplies, in particular to a UPS power supply for an elevator car. Background Art

[0002] Under normal circumstances, the electrical equipment in the elevator car is powered by AC mains, but inevitably, there will be a power outage. In order to improve the safety of the elevator car, a battery will be set as an emergency power supply in the event of a mains power outage. At present, the switching between the mains and the emergency power supply is mainly achieved through the cooperation of the mains detection unit, the control unit and the relay. The specific process is that after the mains detection unit detects that there is no mains, it sends a signal to the control unit, and the control unit controls the relay to complete the switching. This process involves many links. If there is a problem in any link, the switching will fail, and the reliability of the power supply of the entire elevator car is relatively low. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a UPS power supply for an elevator car, which can realize the switching between mains power supply and battery power supply only through the cooperation of a mains power detection circuit and a discharge switch circuit, and has a simple circuit and high reliability.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a UPS power supply for an elevator car, comprising:

[0005] Mains power interface;

[0006] A rectifier and filter circuit, connected to the mains interface, for rectifying and filtering the mains to obtain direct current;

[0007] A transformer circuit, connected to the rectifier and filter circuit, for transforming the DC power to output a first DC voltage and a second DC voltage, wherein the first DC voltage output end of the transformer circuit is connected to a call alarm in the elevator car through a device power supply end to supply power;

[0008] A storage battery is connected to the power supply end of the device through a battery connection end, a discharge switch circuit and a boost circuit in sequence, and the second DC voltage output end of the voltage conversion circuit is connected to the storage battery through the battery connection end for charging;

[0009] A mains power detection circuit is connected to the mains power interface and is used to detect whether there is mains power; and when no mains power is detected, the discharge switch circuit is turned on so that the storage battery supplies power to the device power supply end through the boost circuit.

[0010] In order to further control the on-off connection between the storage battery and the battery connection terminal, the UPS power supply for the elevator car also includes a battery switch circuit, and the battery connection terminal and the discharge switch circuit are both connected to the storage battery through the battery switch circuit.

[0011] In order to automatically control the on and off between the battery and the battery connection terminal, the UPS power supply for the elevator car also includes a control circuit, which is respectively connected to the battery connection terminal and the battery switch circuit, and is used to control the battery switch circuit to be turned on when there is a voltage output at the battery connection terminal.

[0012] Furthermore, the battery switching circuit includes an NPN transistor 2V6 and a relay RLY1, the base of the NPN transistor 2V6 is connected to the control circuit through resistors 2R14 and 2R13 connected in series, the collector is connected to one end of the relay RLY1 coil through a voltage regulator tube 2V5, the emitter is grounded, the other end of the relay RLY1 coil is connected to the positive electrode of the battery, and the normally open switch of the relay RLY1 is connected between the positive electrode of the battery and the battery connection end.

[0013] In order to manually control the on and off between the battery and the battery connection terminal, the battery switch circuit also includes buttons SW2 and SW3, button SW2 is connected between the common end of resistor 2R14 and resistor 2R13 and the ground, and button SW3 is connected between the collector of NPN transistor 2V6 and the ground.

[0014] In order to automatically start the emergency lighting equipment when there is no mains power, the elevator car is also provided with an emergency lighting equipment. The power supply end of the equipment is connected to the emergency lighting equipment through an emergency lighting switch circuit. The discharge switch circuit is also connected to the emergency lighting switch circuit, and is used to turn on the discharge switch circuit when it is turned on.

[0015] Furthermore, the AC power detection circuit includes a rectifier bridge BR2 and an optocoupler 2ICA, the input end of the rectifier bridge is connected to the AC power interface, the output end is connected to pins 1 and 2 of the optocoupler 2ICA, pin 4 of the optocoupler 2ICA is connected to a positive voltage through a resistor, pin 3 is grounded, and pin 4 of the optocoupler 2ICA serves as a control end for controlling whether the discharge switch circuit is turned on or not.

[0016] Furthermore, the discharge switch circuit includes an NPN transistor 2V10 and a PNP transistor 3V1, the base of the NPN transistor 2V10 is connected to pin 4 of the optocoupler 2ICA, the emitter is grounded, the collector is connected to the base of the PNP transistor 3V1 through a resistor 3R13, the emitter of the PNP transistor 3V1 is connected to the battery connection end, and the collector is connected to the boost circuit through a resistor 3R4.

[0017] In order to automatically alarm when there is no mains power, the elevator car is also provided with a power outage alarm device. The control circuit is also connected to the mains power detection circuit and the power outage alarm device respectively, and is used to control the power outage alarm device to alarm when the mains power detection circuit detects that there is no mains power.

[0018] After adopting the above technical solution, the utility model realizes the switching between the mains power supply and the battery power supply only through the cooperation of the mains power detection circuit and the discharge switch circuit, and the circuit is simple and the reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a principle block diagram of a UPS power supply for an elevator car of the utility model;

[0020] Figure 2 This is a circuit diagram of a UPS power supply for an elevator car of the utility model;

[0021] Figure 3 It is a circuit diagram of the utility model's mains interface, rectifier filter circuit and transformer circuit;

[0022] Figure 4 A circuit diagram for supplying power to a call alarm and emergency lighting equipment from the power supply end of the device of the utility model;

[0023] Figure 5 It is a circuit diagram of the utility model's mains detection circuit, battery switch circuit and discharge switch circuit;

[0024] Figure 6 A circuit diagram of a boost circuit of the utility model;

[0025] Figure 7 A circuit diagram of a control circuit of the utility model;

[0026] In the figure, 1. AC power interface; 2. Rectification and filtering circuit; 3. Voltage conversion circuit; 4. Equipment power supply end; 5. Livestock battery; 6. Discharge switch circuit; 7. Boost circuit; 8. Battery connection end; 9. AC power detection circuit; 10. Battery switch circuit; 11. Control circuit; 12. Power outage alarm device; 13. Call alarm; 14. Emergency lighting equipment; 15. Emergency lighting switch circuit. DETAILED DESCRIPTION

[0027] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0028] Embodiment 1

[0029] like Figures 1 to 7 As shown, a UPS power supply for an elevator car comprises:

[0030] Mains power interface 1;

[0031] The rectifier and filter circuit 2 is connected to the mains interface 1 and is used to rectify and filter the mains to obtain direct current;

[0032] The transformer circuit 3 is connected to the rectifier filter circuit 2 and is used to transform the DC power to output a first DC voltage and a second DC voltage. The first DC voltage output end of the transformer circuit 3 is connected to the call alarm 13 in the elevator car through the device power supply end 4 to supply power;

[0033] The storage battery 5 is connected to the device power supply terminal 4 through the battery connection terminal 8, the discharge switch circuit 6 and the boost circuit 7 in sequence, and the second DC voltage output terminal of the voltage conversion circuit 3 is connected to the storage battery 5 through the battery connection terminal 8 for charging;

[0034] The mains detection circuit 9 is connected to the mains interface 1 and is used to detect whether there is mains power; and when no mains power is detected, the discharge switch circuit 6 is turned on so that the battery 5 supplies power to the device power supply terminal 4 through the boost circuit 7.

[0035] Specifically, the mains interface 1 is powered by 220V, and the rectifier and filter circuit 2 outputs direct current, which is then converted into direct current by the transformer circuit 3. Figure 3 DC24V is obtained at V24B; DC12V is obtained at V12A, and V24B is used as the device power supply terminal 4, and V12A is used as the battery connection terminal 8. The device power supply terminal 4 obtains a 24V voltage to power the call alarm 13, and can also power the load alarm. In the case of mains power, the battery connection terminal 8 charges the battery 5. In the case of no mains power, the mains detection circuit 9 turns on the discharge switch circuit 6, and the battery 5 is boosted by the boost circuit 7 to supply power to the device power supply terminal 4. This embodiment only realizes the switching between mains power supply and battery 5 power supply through the cooperation of the mains detection circuit 9 and the discharge switch circuit 6. The circuit is simple and reliable.

[0036] In addition, the common storage battery on the market is 12V. The UPS power supply in this embodiment only needs one storage battery 8, which saves costs. When the city power is cut off, the storage battery 5 is used to stabilize the power supply and maintain it for a specified time. When the full-load, fully charged storage battery 5 is powered, it can maintain normal voltage operation for more than 1.5 hours.

[0037] It should be noted that, when the positive electrode voltage of the battery 5 matches the power voltage of the call alarm 13 , the boost circuit 7 may not be provided.

[0038] In this embodiment, the circuit structure of the mains detection circuit 9 can be, but is not limited to, Figure 2 , Figure 5As shown, it includes a rectifier bridge BR2 and an optocoupler 2ICA, the input end of the rectifier bridge is connected to the mains interface 1, the output end is connected to pins 1 and 2 of the optocoupler 2ICA, pin 4 of the optocoupler 2ICA is connected to a positive voltage through a resistor, pin 3 is grounded, and pin 4 of the optocoupler 2ICA is used as a control end for controlling whether the discharge switch circuit 6 is turned on or not.

[0039] In this embodiment, the entire discharge switch circuit 6 is used to control the on-off between the battery connection terminal 8 and the voltage input terminal of the boost circuit 7. The circuit structure of the discharge switch circuit 6 can be, but is not limited to, as follows: Figure 2 , Figure 5 As shown, it includes an NPN transistor 2V10 and a PNP transistor 3V1, the base of the NPN transistor 2V10 is connected to pin 4 of the optocoupler 2ICA, the emitter is grounded, the collector is connected to the base of the PNP transistor 3V1 through a resistor 3R13, the emitter of the PNP transistor 3V1 is connected to the battery connection terminal 8, and the collector is connected to the boost circuit 7 through a resistor 3R4.

[0040] like Figure 5 As shown, when the city power is 220V, L and N are reduced by RC to make the primary side of the optocoupler 2ICA conductive, and the secondary side conductive to make point A low level. Transistor 2V10 is not conductive, and transistor 3V1 is not conductive, so VCC cannot be powered. When the city power is off, the entire transformer circuit 3 does not work, so the transformer circuit 3 will not output voltage to V24B and V12A. At this time, the primary side of the optocoupler 2ICA is not conductive, and the secondary side is not conductive. Point A is high level, transistor 2V10 is conductive, and transistor 3V1 is also conductive. The collector of transistor 3V1, that is, VCC, obtains 12V power from the battery 5, and the boost circuit 7 is input with voltage.

[0041] In this embodiment, if Figure 2 , Figure 3 As shown, the rectifier and filter circuit 2 includes a rectifier bridge BR1 and a filter capacitor IC1. The rectifier and filter circuit 2 can filter out interference in the power grid and prevent the power supply from interfering with the power grid.

[0042] In this embodiment, if Figure 2 , 3 As shown, the voltage conversion circuit 2 is specifically a MOS tube flyback power supply, including a PWM controller 1IC1, a MOS tube 1V5 and a transformer. The voltage conversion circuit 2 adopts PWM modulation and has the characteristics of full output isolation, simple circuit and high reliability.

[0043] In this embodiment, if Figure 2 , 6 As shown, the boost circuit 7 includes a PWM controller 3IC1 and a MOS tube 3V3. The model of the PWM controller 1IC1 may be UC2843B. Figure 2 , Figure 5 and Figure 7 As shown, the control circuit includes a single-chip microcomputer and its peripheral circuits. The model of the single-chip microcomputer may be 12F675.

[0044] Embodiment 2

[0045] Based on the first embodiment, Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the UPS power supply for the elevator car further includes a battery switch circuit 10 , and the battery connection terminal 8 and the discharge switch circuit 6 are both connected to the storage battery 5 through the battery switch circuit 10 .

[0046] A battery switch circuit 10 is provided, and whether the storage battery 5 is connected to the UPS power supply can be controlled by turning the battery switch circuit 10 on and off.

[0047] Embodiment 3

[0048] Based on the second embodiment, Figure 1 , Figure 2 and Figure 7 As shown, the UPS power supply for the elevator car also includes a control circuit 11, which is connected to the battery connection terminal 8 and the battery switch circuit 10 respectively, and is used to control the battery switch circuit 10 to be turned on when the battery connection terminal 8 has a voltage output.

[0049] The battery switching circuit 10 may include, but is not limited to, an NPN transistor 2V6 and a relay RLY1, wherein the base of the NPN transistor 2V6 is connected to the control circuit 11 via resistors 2R14 and 2R13 connected in series, the collector is connected to one end of the coil of the relay RLY1 via a voltage regulator tube 2V5, the emitter is grounded, the other end of the coil of the relay RLY1 is connected to the positive electrode of the battery 5, and the normally open switch of the relay RLY1 is connected between the positive electrode of the battery 5 and the battery connection terminal 8.

[0050] Specifically, Figure 5 As shown, the 12V voltage at the battery connection terminal 8 is obtained by the voltage regulator 7805 to obtain 5V, which is used to power the single-chip microcomputer 12F675. If there is an output of 12V, the 2.5V output by the previous stage TL431 is rectified by the diode 2V9, and the resistor 2R32 limits the current and flows into the 2-pin IO port of the single-chip microcomputer 12F675. The 5-pin of the single-chip microcomputer 12F675 always outputs a high level, the NPN transistor 2V6 is turned on, one end of the relay RLY1 coil is connected to the positive electrode of the emergency battery 5, and the other end is grounded to control the normally open switch action of the relay RLY1, so that the battery connection terminal 8 is connected to the positive electrode of the battery 5 for charging.

[0051] When the city power fails, the entire flyback power supply does not work, so the flyback power supply V24B and V12A have no output. Pin 5 of the microcontroller 12F675 continues to output a high level, and RLY1 continues to work, and the 12V battery 5 reversely supplies power to the battery connection terminal 8. At this time, point A is a high level, transistor 2V10 is turned on, transistor 3V1 is also turned on, and VCC gets the 12V power of battery 5.

[0052] Embodiment 4

[0053] On the basis of the third embodiment, the battery switch circuit 10 further includes a button SW2 and a button SW3. The button SW2 is connected between the common end of the resistor 2R14 and the resistor 2R13 and the ground. The button SW3 is connected between the collector of the NPN transistor 2V6 and the ground.

[0054] Specifically, when the UPS is in an emergency state, it can be manually turned off by pressing button SW3 or turned on by pressing button SW2. When the UPS is in an emergency state, if the button SW3 is pressed, the transistor 2V6 (9014) will be disconnected, the relay RLY1 will not be attracted, and the battery 5 will not be powered at V12A, that is, the battery connection terminal 8. This signal monitoring is sent to the 7th pin of the single-chip microcomputer 12F675 through the resistor R*1, R*3 voltage division, and the 5th pin outputs a low level through the program control, thereby realizing the manual shutdown of the UPS power supply.

[0055] At this time, if the button SW2 is pressed again, the relay RLY1 is energized and closed, and the same signal is sent to the single-chip microcomputer 12F675. The 5th foot of the single-chip microcomputer 12F675 continues to output a high level, so that V12A, that is, the battery connection terminal 8, has electricity, and the subsequent stage outputs 24V to work. The 2.4V voltage regulator tube 2V5 here is divided, because the 12V battery 5 can be charged to a maximum of 14.4V, ensuring that the voltage of the coil on the relay RLY1 is not too high and damaged.

[0056] Embodiment 5

[0057] On the basis of any one of the embodiments 1 to 4, Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the elevator car is also provided with an emergency lighting device 14, the device power supply terminal 4 is connected to the emergency lighting device 14 via the emergency lighting switch circuit 15, and the discharge switch circuit 6 is also connected to the emergency lighting switch circuit 15, for turning on the discharge switch circuit 6 when the emergency lighting switch circuit 15 is turned on.

[0058] The emergency lighting switch circuit 15 includes a relay RLY2 , one end of a coil of the relay RLY2 is connected to VCC, and the other end is grounded.

[0059] Specifically, when VCC has 12V, the PWM controller 3IC1 is powered on and starts working, and V12V is boosted to 24V through the boost circuit 7 so that V24B has 24V, which makes the call alarm 13 in the elevator work; at the same time, the relay RLY2 is energized, and the 24V supplies power to the emergency lighting equipment 14. At this point, the general principle of the UPS power supply working after the city power outage is completed.

[0060] Embodiment 6

[0061] Based on the third embodiment, Figure 1 , Figure 2 and Figure 7 As shown, there is also a power failure alarm device 12 in the elevator car, and the control circuit 11 is also connected to the mains detection circuit 9 and the power failure alarm device 12 respectively, for controlling the power failure alarm device 12 to alarm when the mains detection circuit 9 detects that there is no mains power.

[0062] The power failure alarm device 12 may include a speaker B1, an alarm light LED2, etc. When the city power fails, in addition to the battery 5 outputting 24V emergency through the boost circuit 7, the 6th pin of the microcontroller 12F675 will output pulse signals at intervals, the speaker B1 will alarm to indicate the power failure, and the alarm light LED2 will flash continuously.

[0063] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A UPS power supply for an elevator car, characterized in that: include: Mains power interface (1); A rectifier and filter circuit (2) connected to the mains interface (1) and used to rectify and filter the mains to obtain direct current; A transformer circuit (3) connected to the rectifier filter circuit (2) and used for transforming the DC power to output a first DC voltage and a second DC voltage, wherein the first DC voltage output end of the transformer circuit (3) is connected to a call alarm (13) in the elevator car through a device power supply end (4) to supply power; A storage battery (5) is connected to the device power supply end (4) via a battery connection end (8), a discharge switch circuit (6) and a boost circuit (7) in sequence, and a second DC voltage output end of the voltage conversion circuit (3) is connected to the storage battery (5) via the battery connection end (8) for charging; A mains power detection circuit (9) is connected to the mains power interface (1) and is used to switch on the discharge switch circuit (6) when no mains power is detected, so that the storage battery (5) supplies power to the device power supply terminal (4) through the boost circuit (7).

2. The UPS power supply for an elevator car according to claim 1, characterized in that: It also includes a battery switch circuit (10), and the battery connection terminal (8) and the discharge switch circuit (6) are both connected to the storage battery (5) through the battery switch circuit (10).

3. The UPS power supply for an elevator car according to claim 2, characterized in that: It also includes a control circuit (11), which is connected to the battery connection terminal (8) and the battery switch circuit (10) respectively, and is used to control the battery switch circuit (10) to be turned on when there is a voltage output at the battery connection terminal (8).

4. The UPS power supply for an elevator car according to claim 3, characterized in that: The battery switch circuit (10) comprises an NPN transistor 2V6 and a relay RLY1, wherein the base of the NPN transistor 2V6 is connected to a control circuit (11) via a resistor 2R14 and a resistor 2R13 connected in series, the collector is connected to one end of a coil of the relay RLY1 via a voltage regulator tube 2V5, the emitter is grounded, the other end of the coil of the relay RLY1 is connected to a positive electrode of a storage battery (5), and the normally open switch of the relay RLY1 is connected between the positive electrode of the storage battery (5) and the battery connection terminal (8).

5. The UPS power supply for an elevator car according to claim 4, characterized in that: The battery switch circuit (10) further comprises a button SW2 and a button SW3, wherein the button SW2 is connected between the common end of the resistor 2R14 and the resistor 2R13 and the ground, and the button SW3 is connected between the collector of the NPN transistor 2V6 and the ground.

6. The UPS power supply for an elevator car according to claim 1, characterized in that: The elevator car is also provided with an emergency lighting device (14). The device power supply end (4) is connected to the emergency lighting device (14) via an emergency lighting switch circuit (15). The discharge switch circuit (6) is also connected to the emergency lighting switch circuit (15) for switching on the discharge switch circuit (6) when the emergency lighting switch circuit (15) is switched on.

7. The UPS power supply for an elevator car according to claim 1, characterized in that: The mains power detection circuit (9) comprises a rectifier bridge BR2 and an optocoupler 2ICA, wherein the input end of the rectifier bridge is connected to the mains power interface (1), and the output end is connected to pins 1 and 2 of the optocoupler 2ICA, pin 4 of the optocoupler 2ICA is connected to a positive voltage via a resistor, pin 3 is grounded, and pin 4 of the optocoupler 2ICA serves as a control end for controlling whether the discharge switch circuit (6) is turned on or off.

8. The UPS power supply for an elevator car according to claim 1, characterized in that: The discharge switch circuit (6) comprises an NPN transistor 2V10 and a PNP transistor 3V1, the base of the NPN transistor 2V10 is connected to the mains detection circuit (9), the emitter is grounded, the collector is connected to the base of the PNP transistor 3V1 via a resistor 3R13, the emitter of the PNP transistor 3V1 is connected to a battery connection terminal (8), the collector is connected to a boost circuit (7) via a resistor 3R4, and the mains detection circuit (9) is configured to output a high level to the base of the NPN transistor 2V10 when no mains is detected.

9. The UPS power supply for an elevator car according to claim 3, characterized in that: The elevator car is also provided with a power failure alarm device (12), and the control circuit (11) is also connected to the mains power detection circuit (9) and the power failure alarm device respectively, and is used to control the power failure alarm device (12) to alarm when the mains power detection circuit (9) detects that there is no mains power.

Images