Elevator car lighting controller

Abstract

The present invention provides an elevator car lighting controller. The mains input unit of the controller is connected to the mains power supply, and the output end is connected to the input end of the driving unit; the primary winding of the transformer is connected to the mains input unit, the secondary winding is connected to the input end of the second rectification and filtering circuit, and the second rectification and filtering circuit is connected to the lighting lamp; the emergency power supply unit is connected to the emergency power supply of the elevator control system, the output end of the boost circuit is connected to the second rectification and filtering circuit, the control end of the second control chip and the driving unit are respectively connected to the control circuit. When the driving unit stops power supply, the control circuit stops supplying power to the control end, the second control chip works, and supplies power to the lighting lamp through the boost circuit. The present invention integrates normal lighting and emergency lighting, and utilizes the emergency power supply of the elevator control system, with simple installation, reduced complexity of the controller, improved reliability, and reduced difficulty of daily maintenance.

Description

Technical Field

[0001] The present invention relates to the field of elevator car lighting, and particularly to a controller for an elevator car lighting lamp. Background Art

[0002] At present, ceiling lamps are installed on the top of existing elevator cars. However, since the main function of an elevator car is to transport passengers up and down, and the time passengers spend in the elevator car is short, the requirement for the lighting device is that it can meet general lighting. And generally, elevators operate throughout the year, so sudden power outages often occur during their use. In order to keep the passengers in the car calm, it is usually necessary to set up an emergency lighting system in the car to provide emergency lighting for the car in case of sudden power outages.

[0003] The existing elevator car lighting usually adopts the technical means of setting independent normal lighting and independent emergency lighting. The independent emergency lighting includes an independent battery, an independent power management system, and an independent light-emitting body. The normal lighting and the independent lighting use different power supplies and light-emitting bodies, which are troublesome to install, have low reliability, and cause great inconvenience to daily maintenance. For example, the light-emitting body of the emergency lighting does not emit light when there is no power outage, and it is difficult to find whether there is a problem during daily operation, so it cannot be ensured that it can provide lighting during a failure. At the same time, the setting of two groups of lamps makes its cost uncontrollable and is not conducive to cost management. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a controller for an elevator car lighting lamp, which connects the lighting lamp to the commercial power and the emergency power supply respectively, so as to integrate the normal lighting and the emergency lighting together. The two use the same lighting lamp and power supply, and make full use of the emergency power supply of the elevator control system, making the whole system more compact and cost-saving, simple to install, reducing the complexity of the controller, improving the reliability, being able to quickly judge whether the light-emitting body is normal during daily operation, and reducing the difficulty of daily maintenance.

[0005] To solve the above problems, a technical solution adopted by the present invention is as follows: An elevator car lighting controller, the elevator car lighting controller includes: a mains input unit, a driving unit, and an emergency power supply unit. The input end of the mains input unit is connected to the mains power supply, and the output end is connected to the input end of the driving unit. The mains input unit includes a first rectifying and filtering circuit, and converts the mains power supply into direct current through the first rectifying and filtering circuit and outputs it to the driving unit. The driving unit includes a first main control chip, a transformer, and a second rectifying and filtering circuit. The primary winding of the transformer is connected to the mains input unit, and the secondary winding is connected to the input end of the second rectifying and filtering circuit. The first main control chip is respectively connected to the primary winding and the auxiliary winding to detect the primary current and secondary open-circuit voltage of the transformer. The output end of the second rectifying and filtering circuit is connected to the lighting lamp, and supplies power to the lighting lamp through the second rectifying and filtering circuit. The emergency power supply unit is connected to the emergency power supply of the elevator control system, and includes a boosting circuit and a control circuit. The output end of the boosting circuit is connected to the second rectifying and filtering circuit. The emergency power supply unit includes a second control chip. The control end of the second control chip and the driving unit are respectively connected to the control circuit. When the driving unit stops supplying power, the control circuit stops supplying power to the control end, the second control chip works, and supplies power to the lighting lamp through the boosting circuit.

[0006] Further, the mains input unit further includes an EMC circuit. The EMC circuit includes a first varistor, a second varistor, a first capacitor, and a first inductor. The first varistor, the second varistor, and the first capacitor are connected in parallel. The first resistor is connected in parallel with the first inductor. Both ends of the first varistor are connected to the live wire and the neutral wire of the mains power supply.

[0007] Further, the first rectifying and filtering circuit includes a first rectifier bridge, a third capacitor, and a fourth capacitor connected in parallel. The input end of the first rectifier bridge is connected in parallel with the second varistor. The positive output end is connected to the first end of the first resistor. The second end of the first resistor is connected to one end of the fourth capacitor.

[0008] Further, the driving unit further includes a first absorption circuit. The first absorption circuit includes a first diode, a fourth resistor, and a fifth capacitor. The fourth resistor is connected in parallel with the fifth capacitor. The positive electrode of the first diode is connected to the first connection terminal of the primary winding, the negative electrode is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the third connection terminal of the primary winding. The voltage spikes generated by the transformer are absorbed through the first absorption circuit.

[0009] Further, the driving unit further includes a power supply circuit, and the power supply circuit includes a second resistor, a third resistor, a thirteenth resistor, an eleventh capacitor, and a second diode. The second resistor, the third resistor, the thirteenth resistor, and the eleventh capacitor are connected in series in sequence. One end of the second resistor that is not connected to the third resistor is connected to the third terminal of the primary winding. The negative electrode of the second diode is connected to one end of the thirteenth resistor that is not connected to the eleventh capacitor, and the positive electrode is connected to the seventh terminal of the auxiliary winding. The voltage input terminal of the first main control chip is connected to the connection end of the eleventh capacitor and the thirteenth resistor, and the other end of the eleventh capacitor is grounded. The first main control chip is powered by the power supply circuit.

[0010] Further, the driving unit further includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and a twelfth capacitor. The fourteenth resistor and the fifteenth resistor are connected in parallel. The sixteenth resistor and the seventeenth resistor are connected in series. The twelfth capacitor is connected in parallel with the seventeenth resistor. One end of the seventeenth resistor is connected to the feedback terminal of the first main control chip, and the other end is grounded. One end of the fourteenth resistor is grounded, and the other end is connected to the feedback terminal of the first main control chip.

[0011] Further, the second rectifying and filtering circuit includes a third diode, a seventh capacitor, a ninth capacitor, and a sixth resistor. The seventh capacitor, the ninth capacitor, and the sixth resistor are connected in parallel. The anode of the third diode is connected to the fifth terminal of the secondary winding, and the cathode is connected to one end of the seventh capacitor. The other end of the seventh capacitor is connected to the fourth terminal of the secondary winding.

[0012] Further, the emergency power supply unit further includes a third rectifying circuit, and the third rectifying circuit includes a second rectifying bridge, an eighth capacitor, a tenth capacitor, and an eighteenth resistor. The input terminal of the second rectifying bridge is connected to the emergency power supply, and the output terminal is connected in parallel with the eighth capacitor. One end of the tenth capacitor is connected to the negative output terminal of the second rectifying bridge, and the other end is connected to the voltage terminal of the second control chip. One end of the eighteenth resistor is connected to the positive output terminal of the second rectifying bridge, and the other end is connected to the voltage terminal of the second control chip.

[0013] Further, the control circuit includes a fourth diode, a seventh resistor, an eighth resistor, a first field-effect transistor, a first voltage-regulator diode, a second voltage-regulator diode, and a second capacitor. The fourth diode, the seventh resistor, and the eighth resistor are connected in series in sequence. The anode of the fourth diode is connected to the fifth terminal of the secondary winding, and the cathode is grounded through the eighth resistor. The anode of the first voltage-regulator diode is connected to the cathode of the fourth diode, and the cathode is connected to the anode of the lighting lamp. The second voltage-regulator diode and the second capacitor are both connected in parallel with the eighth resistor. The anode of the second voltage-regulator diode is grounded. The gate of the first field-effect transistor is connected to the cathode of the second voltage-regulator diode, the drain is connected to the control terminal of the second control chip, and the source is grounded.

[0014] Further, the boost circuit further includes a third inductor, a fifth diode, a ninth resistor, and a tenth resistor. One end of the third inductor is connected to the positive output terminal of the second rectifier bridge, and the other end and the conversion terminal of the second control chip are both connected to the anode of the fifth diode. The cathode of the fifth diode is connected to the positive pole of the lighting lamp. The ninth resistor and the tenth resistor are connected in parallel. One end of the ninth resistor is connected to the fourth terminal of the secondary winding, and the other end is respectively connected to the negative pole of the lighting lamp and the current detection terminal of the second control chip.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The lighting lamp is respectively connected to the commercial power and the emergency power supply, so that the normal lighting and the emergency lighting are integrated together. The same lighting lamp and power supply are used for both, and the emergency power supply of the elevator control system is fully utilized, making the whole system more compact and cost-saving. The installation is simple, the complexity of the controller is reduced, the reliability is improved, and it can quickly judge whether the light-emitting body is normal during daily operation, reducing the difficulty of daily maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an embodiment of the elevator car lighting lamp controller of the present invention;

[0017] Figure 2 It is a circuit diagram of an embodiment of the elevator car lighting lamp controller of the present invention.

[0018] In the figure: L1 is the live wire; N1 is the neutral wire; F1 is the fuse; VR1 is the first varistor; VR2 is the second varistor; C1 is the first capacitor; DB1 is the first rectifier bridge; C3 is the third capacitor; NTC1 is the thermistor; R1 is the first resistor; L1 is the first inductor; R2 is the second resistor; C5 is the fifth capacitor; R4 is the fourth resistor; CY1 is the first safety capacitor; T1 is the transformer; D1 is the first diode; U1 is the first main control chip; D2 is the second diode; R3 is the third resistor; R13 is the thirteenth resistor; C11 is the eleventh capacitor; R17 is the seventeenth resistor; C12 is the twelfth capacitor; R14 is the fourteenth resistor; R15 is the fifteenth resistor; CY2 is the second safety capacitor; R5 is the fifth resistor; C6 is the sixth capacitor; D3 is the third diode; C7 is the seventh capacitor; R6 is the sixth resistor; C9 is the ninth capacitor; R9 is the ninth resistor; R10 is the tenth resistor; L2 is the second inductor; R7 is the seventh resistor; D4 is the fourth diode; Z1 is the first zener diode; Q1 is the first field effect transistor; Z2 is the second zener diode; C2 is the second capacitor; R8 is the eighth resistor; U2 is the second control chip; D5 is the fifth diode; L3 is the third inductor; R18 is the eighteenth resistor; C10 is the tenth capacitor; C8 is the eighth capacitor; DB2 is the second rectifier bridge; C4 is the fourth capacitor; R11 is the eleventh resistor; R12 is the twelfth resistor; R16 is the sixteenth resistor. Detailed implementation manner

[0019] Next, in combination with the accompanying drawings and the detailed implementation manner, the present invention will be further described. It should be noted that, on the premise of no conflict, the following described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0020] Please refer to Figure 1-2 , in which, Figure 1 is the structural diagram of an embodiment of the elevator car lighting controller of the present invention; Figure 2 is the circuit diagram of an embodiment of the elevator car lighting controller of the present invention. In combination with the attached Figure 1-2 the elevator car lighting controller of the present invention will be described in detail.

[0021] In this embodiment, the elevator car lighting controller includes: a mains input unit, a driving unit, and an emergency power supply unit. The input end of the mains input unit is connected to the mains power supply, and the output end is connected to the input end of the driving unit. The mains input unit includes a first rectifier and filter circuit, which converts the mains power supply into direct current and outputs it to the driving unit through the first rectifier and filter circuit. The driving unit includes a first main control chip U1, a transformer T1, and a second rectifier and filter circuit. The primary winding of the transformer T1 is connected to the mains input unit, and the secondary winding is connected to the input end of the second rectifier and filter circuit. The first main control chip U1 is respectively connected to the primary winding and the auxiliary winding of the transformer T1 to detect the primary current and the secondary open circuit voltage of the transformer T1. The output end of the second rectifier and filter circuit is connected to the lighting lamp, and the lighting lamp is powered through the second rectifier and filter circuit. The emergency power supply unit is connected to the emergency power supply of the elevator control system and includes a boost circuit and a control circuit. The output end of the boost circuit is connected to the second rectifier and filter circuit and includes a second control chip U2. The control end of the second control chip U2 and the driving unit are respectively connected to the control circuit. When the driving unit stops power supply, the control circuit stops supplying power to the control end, the second control chip U2 works, and the lighting lamp is powered through the boost circuit.

[0022] In this embodiment, when the lighting controller can obtain the mains power supply under normal conditions, it controls the lighting lamp to draw energy from the mains power supply, and the emergency function is not started. When the mains power supply is disconnected, the emergency function is started. The control circuit controls the second control chip U2 to work, and then the boost circuit supplies power to the lighting lamp to provide emergency lighting.

[0023] In this embodiment, the lighting lamp can be an LED lamp, an incandescent lamp, or other lighting lamps.

[0024] In this embodiment, the first main control chip U1 includes a PWM control circuit and a current and voltage detection circuit.

[0025] In this embodiment, the mains input unit further includes an EMC (electromagnetic compatibility) circuit. The EMC circuit includes a first varistor VR1, a second varistor VR2, a first capacitor C1, and a first inductor L1. The first varistor VR1, the second varistor VR2, and the first capacitor C1 are connected in parallel. The first resistor R1 is connected in parallel with the first inductor L1. Both ends of the first varistor VR1 are respectively connected to the live wire L1 and the neutral wire N1 of the mains power supply. The electromagnetic compatibility of the mains input unit is improved through the EMC circuit.

[0026] In this embodiment, the mains power supply is alternating current, and its voltage can be 100 - 220V.

[0027] In this embodiment, a fuse F1 is further provided in the mains input unit. The fuse F1 is connected to the live wire L1 of the mains power supply. The fuse characteristic of the fuse F1 is used to prevent the circuit where the lighting controller is located from catching fire due to short circuit or overload heating.

[0028] In this embodiment, the mains input unit further includes a thermistor NTC1. One end of the thermistor NTC1 is connected to the neutral line N1 of the mains, and the other end is connected to one end of the second varistor VR2. The other end of the second varistor VR2 is connected to the live wire L1 through a fuse F1.

[0029] In a specific embodiment, the model of the first varistor VR1 is 10D681, the model of the second varistor VR2 is 10D651, the model of the thermistor NTC1 is 7D-10, the capacitance value of the first capacitor C1 is 100NF, the inductance of the first inductor L1 is 1mH, and the resistance value of the first resistor R1 is 6.2KΩ.

[0030] In this embodiment, the first rectifier and filter circuit includes a first rectifier bridge DB1, a third capacitor C3, and a fourth capacitor C4 connected in parallel. The input end of the first rectifier bridge DB1 is connected in parallel with the second varistor VR2, and the output end is connected in parallel with the third capacitor C3. The positive output end is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to one end of the fourth capacitor C4. The alternating current is converted into relatively smooth direct current through the first rectifier and filter circuit.

[0031] In this embodiment, the mains input end element further includes an eleventh resistor R11 and a twelfth resistor R12. The eleventh resistor R11 and the twelfth resistor R12 are connected in series. One end of the eleventh resistor R11 is connected to the live wire L1 through a fuse F1, and the other end is connected to the neutral line N1 through the twelfth resistor R12. The discharge circuit composed of the eleventh resistor R11 and the twelfth resistor R12 quickly discharges the first capacitor C1 when the mains is turned off, avoiding the residual charge of the first capacitor C1 after power-off from causing potential safety hazards to the outside.

[0032] In a specific embodiment, the package type of the first rectifier bridge DB1 is MB10S, the capacitance values of the third capacitor C3 and the fourth capacitor C4 are both 2.2UF, and the withstand voltage is 450V. The resistance values of the eleventh resistor R11 and the twelfth resistor R12 are both 1.5MΩ.

[0033] In this embodiment, the drive unit further includes a first absorption circuit. The first absorption circuit includes a first diode D1, a fourth resistor R4, and a fifth capacitor C5. The fourth resistor R4 and the fifth capacitor C5 are connected in parallel. The positive electrode of the first diode D1 is connected to the first terminal of the primary winding, the negative electrode is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is connected to the third terminal of the primary winding. The first absorption circuit absorbs the voltage spikes generated by the leakage inductance of the transformer T1 to avoid damaging the transformer T1.

[0034] In this embodiment, the transformer T1 plays the roles of isolation and energy conversion, transferring the energy received by the primary winding to the secondary winding, and providing power supply to the first main control chip U1 and the voltage detection reference of the secondary winding. Among them, the first terminal, the second terminal, and the third terminal are arranged on the primary winding, the fourth terminal and the fifth terminal are arranged on the secondary winding, and the sixth terminal and the seventh terminal are arranged on the auxiliary winding.

[0035] In a specific embodiment, the model of the first diode D1 is A7, the resistance value of the fourth resistor R4 is 100 KΩ, and the capacitance value of the fifth capacitor C5 is 1 NF.

[0036] In this embodiment, the driving unit further includes a power supply circuit. The power supply circuit includes a second resistor R2, a third resistor R3, a thirteenth resistor R13, an eleventh capacitor C11, and a second diode D2. The second resistor R2, the third resistor R3, the thirteenth resistor R13, and the eleventh capacitor C11 are connected in series in sequence. The end of the second resistor R2 not connected to the third resistor R3 is connected to the third terminal of the primary winding. The negative electrode of the second diode D2 is connected to the end of the thirteenth resistor R13 not connected to the eleventh capacitor C11, and the positive electrode is connected to the seventh terminal of the auxiliary winding. The voltage input terminal of the first main control chip U1 is connected to the end of the eleventh capacitor C11 connected to the thirteenth resistor R11, and the other end of the eleventh capacitor C11 is grounded. The first main control chip U1 is powered by the power supply circuit. When the mains input unit supplies power, it first supplies power to the first main control chip U1 through the second resistor R2 and the third resistor R3 to start it. After the first main control chip U1 starts, the auxiliary winding of the transformer T1 supplies power to the first main control chip U1 through the second diode D2 and the thirteenth resistor R13, and is filtered by the eleventh capacitor C11.

[0037] In a specific embodiment, the resistance values of the second resistor R2 and the third resistor R3 are both 750 KΩ, the resistance value of the thirteenth resistor R13 is 22 Ω, the model of the second diode D2 is A7, the model of the first main control chip U1 is QB3398, the capacitance value of the eleventh capacitor C11 is 10 UF, and the withstand voltage is 25 V.

[0038] In this embodiment, the drive unit further includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and a twelfth capacitor C12. The fourteenth resistor R14 and the fifteenth resistor R15 are connected in parallel. The sixteenth resistor R16 and the seventeenth resistor R17 are connected in series. The twelfth capacitor C12 is connected in parallel with the seventeenth resistor R17. One end of the seventeenth resistor R17 is connected to the feedback terminal of the first main control chip U1, and the other end is grounded. One end of the fourteenth resistor R14 is grounded, and the other end is connected to the feedback terminal of the first main control chip U1. The sixteenth resistor R16, the seventeenth resistor R17, and the twelfth capacitor C12 provide primary current monitoring to the first main control chip U1 to limit the open-circuit voltage. The fourteenth resistor R14 and the fifteenth resistor R15 provide primary current monitoring to the first main control chip U1 to set the output current.

[0039] In this embodiment, the drain pin of the first main control chip U1 is connected to the first connection terminal of the primary winding.

[0040] In a specific embodiment, the resistance values of the fourteenth resistor R14 and the fifteenth resistor R15 are 3.9 ohms, the resistance values of the sixteenth resistor R16 and the seventeenth resistor R17 are 180 KΩ and 10 KΩ respectively, and the capacitance value of the twelfth capacitor C12 is 10 PF.

[0041] In this embodiment, the second rectifying and filtering circuit includes a third diode D3, a seventh capacitor C7, a ninth capacitor C9, and a sixth resistor R6R6. The seventh capacitor C7, the ninth capacitor C9, and the sixth resistor R6R6 are connected in parallel. The anode of the third diode D3 is connected to the fifth connection terminal of the secondary winding, the cathode is connected to one end of the seventh capacitor C7, and the other end of the seventh capacitor C7 is connected to the fourth connection terminal of the secondary winding. The sixth resistor R6R6 discharges the seventh capacitor C7 after the mains power is cut off, avoiding the residual charge of the seventh capacitor C7 causing potential safety hazards to the outside.

[0042] In this embodiment, the drive unit further includes a fifth resistor R5 and a sixth capacitor C6. One end of the fifth resistor R5 is connected to the cathode of the third diode D3, and the other end is connected to the anode of the third diode D3 through the sixth capacitor C6. The fifth resistor R5 and the sixth capacitor C6 absorb the spikes generated at both ends of the third diode D3 to improve the EMI (electromagnetic interference) received by the lighting controller.

[0043] In a specific embodiment, the model of the third diode D3 is SS220, the capacitance value of the seventh capacitor C7 is 220 UF, the withstand voltage is 25 V, the capacitance value of the ninth capacitor C9 is 1 UF, the resistance value of the sixth resistor R6R6 is 22 KΩ. The resistance value of the fifth resistor R5 is 33 Ω, and the capacitance value of the sixth capacitor C6 is 1 NF.

[0044] In this embodiment, the emergency power supply unit further includes a third rectification circuit. The third rectification circuit includes a second rectifier bridge DB2, an eighth capacitor C8, a tenth capacitor C10, and an eighteenth resistor R18. The input end of the second rectifier bridge DB2 is connected to the emergency power supply, and the output end is connected in parallel with the eighth capacitor C8. One end of the tenth capacitor C10 is connected to the negative output end of the second rectifier bridge DB2, and the other end is connected to the voltage terminal of the second control chip U2. One end of the eighteenth resistor R18 is connected to the positive output end of the second rectifier bridge DB2, and the other end is connected to the voltage terminal of the second control chip U2.

[0045] In this embodiment, the second rectifier bridge DB2 provides reverse connection protection, so that even if the emergency power supply is connected reversely, or even alternating current (the voltage cannot exceed the rated value) is connected, it can still work normally.

[0046] In a specific embodiment, the model of the second rectifier bridge DB2 is XL6013, the capacitance value of the eighth capacitor C8 is 220 μF, the withstand voltage is 25V, the capacitance value of the tenth capacitor C10 is 1 μF, and the resistance value of the eighteenth resistor R18 is 0.

[0047] In this embodiment, the control circuit includes a fourth diode D4, a seventh resistor R7, an eighth resistor R8, a first field-effect transistor Q1, a first zener diode Z1, a second zener diode Z2, and a second capacitor C2. The fourth diode D4, the seventh resistor R7, and the eighth resistor R8 are connected in series in sequence. The anode of the fourth diode D4 is connected to the fifth terminal of the secondary winding, and the cathode is grounded through the eighth resistor R8. The anode of the first zener diode Z1 is connected to the cathode of the fourth diode D4, and the cathode is connected to the anode of the lighting lamp. The second zener diode Z2 and the second capacitor C2 are both connected in parallel with the eighth resistor R8. The anode of the second zener diode Z2 is grounded. The gate of the first field-effect transistor Q1 is connected to the cathode of the second zener diode Z2, the drain is connected to the control terminal of the second control chip U2, and the source is grounded.

[0048] In a specific embodiment, the model of the fourth diode D4 is RS1ML, the resistance values of the seventh resistor R7 and the eighth resistor R8 are both 22 kΩ, the model of the first field-effect transistor Q1 is SI2300, and the breakdown voltages of the first zener diode Z1 and the second zener diode Z2 are 22V and 5.1V respectively.

[0049] In this embodiment, the boost circuit further includes a third inductor L3, a fifth diode D5, a ninth resistor R9, and a tenth resistor R10. One end of the third inductor L3 is connected to the positive output terminal of the second rectifier bridge DB2, and the other end and the conversion terminal of the second control chip U2 are both connected to the anode of the fifth diode D5. The cathode of the fifth diode D5 is connected to the positive electrode of the lighting lamp. The ninth resistor R9 and the tenth resistor R10 are connected in parallel. One end of the ninth resistor R9 is connected to the fourth connection terminal of the secondary winding, and the other end is respectively connected to the negative electrode of the lighting lamp and the current detection terminal of the second control chip U2.

[0050] In this embodiment, the inductance of the third inductor L3 is 47 μH, the model of the fifth diode D5 is SS24, the resistance values of the ninth resistor R9 and the tenth resistor R10 are both 2.4 Ω. The cathode of the fifth diode D5 is connected to the cathode of the third diode D3, and the output terminal filtering in the normal state and the emergency state is realized through the ninth capacitor C9 and the seventh capacitor C7.

[0051] In this embodiment, the lighting lamp controller further includes a first safety capacitor CY1, a second safety capacitor CY2, and a second inductor L2. Among them, one end of the first safety capacitor CY1 is connected to the cathode of the first diode D1 through the fourth resistor R4, and the other end is grounded. One end of the second safety capacitor CY2 is connected to the sixth connection terminal of the auxiliary winding, and the other end is grounded. The output terminal of the second rectification and filtering circuit is connected to the lighting lamp through the second inductor L2. The first safety capacitor CY1, the second safety capacitor CY2, and the second inductor L2 are used to suppress common-mode interference and improve EMI performance.

[0052] In a specific embodiment, the models of the first safety capacitor CY1 and the second safety capacitor CY2 are 222M / Y1, and the model of the second inductor L2 is GM1.

[0053] In this embodiment, when the lighting lamp controller is in the normal working state, the mains input is normal, the driving unit works normally, and the secondary winding of the transformer T1 has an output. After rectification and filtering through the fourth diode D4, the seventh resistor R7, the eighth resistor R8, and the second capacitor C2, a voltage is provided to the gate of the first field-effect transistor Q1 to turn on the first field-effect transistor Q1, and then the control terminal of the second control chip U2 is pulled low. At this time, the second control chip U2 is in the standby state and does not provide an output. The load (lighting lamp) only obtains current through the driving unit. The function of the second zener diode Z2 is to limit the gate voltage of the first field-effect transistor Q1 to protect the gate from being broken down.

[0054] When the mains power is disconnected and not supplying power, the lighting controller is in an emergency state. The secondary winding of transformer T1 has no output. The eighth resistor R8 quickly discharges the remaining charge of the second capacitor C2. The gate of the first field-effect transistor Q1 loses voltage and turns off. The internal pull-up of the second main control chip raises the control terminal, and the second control chip U2 enters the working state to provide current to the load.

[0055] Advantageous effects: The lighting controller for the elevator car of the present invention connects the lighting lamp to the mains power and the emergency power supply respectively, thus integrating the normal lighting and the emergency lighting. The same lighting lamp and power supply are used for both, and the emergency power supply of the elevator control system is fully utilized, making the whole system more compact and cost-saving. The installation is simple, the complexity of the controller is reduced, the reliability is improved, and it can quickly judge whether the light-emitting body is normal during daily operation, reducing the difficulty of daily maintenance.

[0056] The above-mentioned embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. An elevator car lighting controller, characterized in that, The elevator car lighting controller includes: a mains input unit, a driving unit, and an emergency power supply unit. The input end of the mains input unit is connected to the mains power supply, and the output end is connected to the input end of the driving unit. It includes a first rectification and filtering circuit, and converts the mains power supply into direct current through the first rectification and filtering circuit and outputs it to the driving unit. The mains input unit further includes an EMC circuit. The EMC circuit includes a first varistor, a second varistor, a first capacitor, and a first inductor. The first varistor, the second varistor, and the first capacitor are connected in parallel. The two ends of the first varistor are connected to the live wire and the neutral wire of the mains power supply. The driving unit includes a first main control chip, a transformer, and a second rectification and filtering circuit. The primary winding of the transformer is connected to the mains input unit, and the secondary winding is connected to the input end of the second rectification and filtering circuit. The first main control chip is respectively connected to the primary winding and the auxiliary winding to detect the primary current and the secondary open-circuit voltage of the transformer. The output end of the second rectification and filtering circuit is connected to the lighting lamp, and supplies power to the lighting lamp through the second rectification and filtering circuit. The emergency power supply unit is connected to the emergency power supply of the elevator control system and includes a boost circuit and a control circuit. The output end of the boost circuit is connected to the second rectification and filtering circuit and includes a second control chip. The control end of the second control chip and the driving unit are respectively connected to the control circuit. When the driving unit stops supplying power, the control circuit stops supplying power to the control end, the second control chip works, and supplies power to the lighting lamp through the boost circuit. The emergency power supply unit further includes a third rectification circuit. The third rectification circuit includes a second rectifier bridge, an eighth capacitor, a tenth capacitor, and an eighteenth resistor. The input end of the second rectifier bridge is connected to the emergency power supply, and the output end is connected in parallel with the eighth capacitor. The control circuit includes a fourth diode, a seventh resistor, an eighth resistor, a first field-effect transistor, a first zener diode, a second zener diode, and a second capacitor. The fourth diode, the seventh resistor, and the eighth resistor are connected in series in sequence. The anode of the fourth diode is connected to the fifth terminal of the secondary winding, and the cathode is grounded through the eighth resistor. The anode of the first zener diode is connected to the cathode of the fourth diode, and the cathode is connected to the anode of the lighting lamp. The second zener diode and the second capacitor are both connected in parallel with the eighth resistor. The anode of the second zener diode is grounded. The gate of the first field-effect transistor is connected to the cathode of the second zener diode, the drain is connected to the control end of the second control chip, and the source is grounded. The boost circuit further includes a third inductor, a fifth diode, a ninth resistor, and a tenth resistor. One end of the third inductor is connected to the positive output terminal of the second rectifier bridge, and the other end and the conversion terminal of the second control chip are both connected to the anode of the fifth diode. The cathode of the fifth diode is connected to the positive electrode of the lighting lamp. The ninth resistor and the tenth resistor are connected in parallel. One end of the ninth resistor is connected to the fourth connection terminal of the secondary winding, and the other end is respectively connected to the negative electrode of the lighting lamp and the current detection terminal of the second control chip.

2. The elevator car lighting controller according to claim 1, wherein The drive unit further includes a first absorption circuit. The first absorption circuit includes a first diode, a fourth resistor, and a fifth capacitor. The fourth resistor and the fifth capacitor are connected in parallel. The positive electrode of the first diode is connected to the first connection terminal of the primary winding, the negative electrode is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the third connection terminal of the primary winding. The voltage spike generated by the transformer is absorbed through the first absorption circuit.

3. The elevator car lighting controller according to claim 1, wherein, The drive unit further includes a power supply circuit. The power supply circuit includes a second resistor, a third resistor, a thirteenth resistor, an eleventh capacitor, and a second diode. The second resistor, the third resistor, the thirteenth resistor, and the eleventh capacitor are connected in series in sequence. The end of the second resistor not connected to the third resistor is connected to the third connection terminal of the primary winding. The negative electrode of the second diode is connected to the end of the thirteenth resistor not connected to the eleventh capacitor, and the positive electrode is connected to the seventh connection terminal of the auxiliary winding. The voltage input terminal of the first main control chip and the connection end of the eleventh capacitor and the thirteenth resistor are connected. The other end of the eleventh capacitor is grounded. The first main control chip is powered through the power supply circuit.

4. The elevator car lighting controller according to claim 3, characterized in that, The drive unit further includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and a twelfth capacitor. The fourteenth resistor and the fifteenth resistor are connected in parallel. The sixteenth resistor and the seventeenth resistor are connected in series. The twelfth capacitor is connected in parallel with the seventeenth resistor. One end of the seventeenth resistor is connected to the feedback terminal of the first main control chip, and the other end is grounded. One end of the fourteenth resistor is grounded, and the other end is connected to the feedback terminal of the first main control chip.

5. The elevator car lighting controller according to claim 1, characterized in that, The second rectifier and filter circuit includes a third diode, a seventh capacitor, a ninth capacitor, and a sixth resistor. The seventh capacitor, the ninth capacitor, and the sixth resistor are connected in parallel. The anode of the third diode is connected to the fifth connection terminal of the secondary winding, the cathode is connected to one end of the seventh capacitor, and the other end of the seventh capacitor is connected to the fourth connection terminal of the secondary winding.

6. The elevator car lighting controller according to claim 1, wherein, One end of the tenth capacitor is connected to the negative output terminal of the second rectifier bridge, and the other end is connected to the voltage terminal of the second control chip. One end of the eighteenth resistor is connected to the positive output terminal of the second rectifier bridge, and the other end is connected to the voltage terminal of the second control chip.

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