Isolation detection type elevator motor power supply detection system

Abstract

The invention discloses an isolation detection type elevator motor power supply detection system which comprises an alternating current voltage access module, a direct current voltage access module, a voltage detection direct input module, an induction type voltage detection module and a control module. The two input ends of the alternating-current voltage access module are connected to the two ends of an elevator motor respectively, the two input ends of the direct-current voltage access module are connected to the two ends of the elevator motor respectively, and the output end of the alternating-current voltage access module or the output end of the direct-current voltage access module is connected to the input end of the voltage detection direct input module. The output end of the inductive voltage detection module is connected to the input end of the control module; a light-emitting part is arranged in the input end of the direct input module, an induction part is arranged in the induction type voltage detection module, and the light-emitting part and the induction part are oppositely arranged. The isolation detection type elevator motor power supply detection system solves the problem that whether the elevator motor is normally powered or not cannot be detected in the prior art.

Description

Technical Field

[0001] This invention relates to the field of elevator motor power supply testing, and specifically to an isolated testing elevator motor power supply testing system. Background Technology

[0002] like Figure 1 As shown, the elevator system includes: a motor power supply module, a relay RL1, a switching transistor Q3, and a control module. The first output terminal of the motor power supply module is connected to one end of the motor through a normally open switch in relay RL1. The second output terminal of the motor power supply module is connected to the other end of the motor through another normally open switch in relay RL1. A DC power supply VCC (outputting 5V) is connected to one end of the coil in relay RL1. The other end of the relay RL1 coil is connected to the collector of switching transistor Q3. The emitter of switching transistor Q3 is grounded, and the base of switching transistor Q3 is connected to the second output terminal of the control module. The second output terminal of the control module controls switching transistor Q3 to close by outputting a high level, energizing the coil. When the coil is energized, the two normally open switches in relay RL1 close, thus powering the motor under the control of the control module. The second output terminal of the control module controls switching transistor Q3 to open by outputting a low level, de-energizing the coil. When the coil is de-energized, the two normally open switches in relay RL1 open, thus de-energizing the motor under the control of the control module.

[0003] Although the above-mentioned elevator system can control whether the elevator motor is running, it still has the following drawbacks: during the operation of the elevator motor, even when power is supplied to the elevator motor, there may be a situation where the elevator motor is not powered due to damage to the motor power supply module, etc. Existing technology cannot detect whether the elevator motor is being powered normally, and cannot guarantee whether the elevator is operating normally. Summary of the Invention

[0004] The present invention provides an isolated detection elevator motor power supply detection system, which solves the problem in the prior art that it is impossible to detect whether the elevator motor is being powered normally.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention discloses an isolated detection type elevator motor power supply detection system, comprising: an AC voltage input module, a DC voltage input module, a voltage detection direct input module, an inductive voltage detection module, and a control module; the two input terminals of the AC voltage input module are respectively connected to the two ends of the elevator motor, the two input terminals of the DC voltage input module are respectively connected to the two ends of the elevator motor, the output terminal of the AC voltage input module or the output terminal of the DC voltage input module is connected to the input terminal of the voltage detection direct input module, and the output terminal of the inductive voltage detection module is connected to the input terminal of the control module; a light-emitting part is provided in the input terminal of the direct input module, and a sensing part is provided in the inductive voltage detection module, with the light-emitting part and the sensing part arranged opposite to each other, and the sensing part used to sense the light intensity of the light-emitting part.

[0007] Preferably, the isolated detection type elevator motor power supply detection system further includes: a controllable switch group and a switch power supply module; the controllable switch group includes: a switch switching control unit, a first normally open switch, a second normally open switch, a third normally open switch, and a normally closed switch; the switch switching control unit controls the operation of the first normally open switch, the second normally open switch, the third normally open switch, and the normally closed switch, and the switch power supply module supplies power to the switch switching control unit; one input terminal of the AC voltage access module is connected to one input terminal of the DC voltage access module through the first normally open switch, and the other input terminal of the AC voltage access module is connected to the other input terminal of the DC voltage access module through the second normally open switch; the DC voltage access module is connected to the input terminal of the voltage detection direct input module through the third normally open switch; the output terminal of the AC voltage access module is connected to the input terminal of the voltage detection direct input module through the normally closed switch; the control terminal of the switch power supply module is connected to the output terminal of the AC voltage access module.

[0008] Preferably, the switch power supply module includes: an isolation sensing unit, a comparator unit, and a switch power supply unit. The input terminal of the isolation sensing unit is connected to the output terminal of the AC voltage access module, the output terminal of the isolation sensing unit is connected to the input terminal of the comparator unit, and the output terminal of the comparator unit is connected to the control terminal of the switch power supply unit. The switch power supply unit supplies power to the switch switching control unit.

[0009] Preferably, the AC voltage access module includes a rectifier unit and a first voltage regulator unit. The two input terminals of the rectifier unit are the two input terminals of the AC voltage access module, and the output terminal of the rectifier unit is connected to the input terminal of the first voltage regulator unit. The output terminal of the first voltage regulator unit is the output terminal of the AC voltage access module.

[0010] Preferably, the DC voltage access module includes: a differential amplifier unit, the two input terminals of the differential amplifier unit being the two input terminals of the DC voltage access module, and the output terminal of the differential amplifier unit being the output terminal of the DC voltage access module.

[0011] Preferably, the voltage detection direct input module includes: a second voltage regulator unit, a prompting unit, and a switch control unit. The input terminal of the second voltage regulator unit is the input terminal of the voltage detection direct input module. The input terminal of the second voltage regulator unit is connected to the input terminal of the prompting unit. The output terminal of the prompting unit is connected to the positive terminal of the light-emitting part. The negative terminal of the light-emitting part is grounded through the switch control unit. The input terminal of the switch control unit is connected to the first output terminal of the control module.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this application, since the elevator motor input voltage is sometimes DC and sometimes AC, an AC voltage input module is designed to detect whether the AC voltage is supplying power normally. This module converts the AC voltage from both ends of the elevator motor into DC voltage for subsequent identification and monitoring by the voltage detection direct input module and the inductive voltage detection module. By setting up the DC voltage input module, the DC voltage from both ends of the elevator motor is input, converted, and then output to the voltage detection direct input module and the inductive voltage detection module for processing. This achieves the ability to detect whether the elevator motor is being supplied power normally when connected to AC voltage or DC voltage.

[0014] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0015] Figure 1 This is the circuit diagram of the elevator motor circuit.

[0016] Figure 2 Circuit diagram for an isolated detection elevator motor power supply detection system.

[0017] Figure 3 This is a circuit diagram of the isolation sensing unit and the comparison unit in the switch power supply module. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 2 as well as Figure 3As shown, this invention discloses an isolated detection type elevator motor power supply detection system, comprising: an AC voltage input module, a DC voltage input module, a voltage detection direct input module, an inductive voltage detection module, and a control module; the two input terminals of the AC voltage input module are respectively connected to the two ends of the elevator motor, the two input terminals of the DC voltage input module are respectively connected to the two ends of the elevator motor, the output terminal OUT1 of the AC voltage input module or the output terminal OUT2 of the DC voltage input module is connected to the input terminal of the voltage detection direct input module, and the output terminal of the inductive voltage detection module is connected to the input terminal of the control module; a light-emitting part is provided in the input terminal of the direct input module, and a sensing part is provided in the inductive voltage detection module, with the light-emitting part and the sensing part arranged opposite to each other, and the sensing part is used to sense the light intensity of the light-emitting part.

[0020] In this application, the control module can use STM32 series chips or control chips of control type such as AT89C52.

[0021] Preferably, the isolated detection type elevator motor power supply detection system further includes: a controllable switch group and a switch power supply module; the controllable switch group includes: a switch switching control unit, a first normally open switch, a second normally open switch, a third normally open switch, and a normally closed switch; the switch switching control unit controls the operation of the first normally open switch, the second normally open switch, the third normally open switch, and the normally closed switch, and the switch power supply module supplies power to the switch switching control unit; one input terminal of the AC voltage input module is connected to one input terminal of the DC voltage input module through the first normally open switch, and the other input terminal of the AC voltage input module is connected to the other input terminal of the DC voltage input module through the second normally open switch; the DC voltage input module is connected to the input terminal of the voltage detection direct input module through the third normally open switch; the output terminal of the AC voltage input module is connected to the input terminal of the voltage detection direct input module through the normally closed switch; the control terminal of the switch power supply module is connected to the output terminal of the AC voltage input module. The controllable switch group can be a relay RL1 with a first normally open switch, a second normally open switch, a third normally open switch, and a normally closed switch, or it can be other switching devices with the same function. The third normally open switch and the normally closed switch can form a single-pole double-throw switch in a relay RL1. The stationary end and the normally closed end of the single-pole double-throw switch form a normally closed switch, and the stationary end and the normally open end of the single-pole double-throw switch form a third normally open switch.

[0022] The design concept of the control switch group and switch power supply module in this application is analyzed as follows: First, since the elevator motor may be connected to either DC voltage or AC voltage (DC voltage is 110V, and AC voltage is also 110V), knowing the voltage range of DC and AC voltages, both the AC voltage input module and the DC voltage input module can be connected to DC and AC voltages within their respective voltage ranges. For ease of connection during testing, this application connects the two input terminals of the AC voltage input module to the two input terminals of the DC voltage input module, thus achieving testing where only two terminals (i.e., the two input terminals of the AC voltage input module) need to be connected. Then, a controllable switch assembly and a switch power supply module were designed. The switch power supply module is always connected to the output terminal of the AC voltage input module, which is always connected to both ends of the elevator motor. Because the AC voltage input module can accept DC voltage, its DC output voltage is very small (approximately 1.5V), while its AC output voltage is very large (approximately 50V). However, connecting AC voltage to the DC voltage input module would damage it. Therefore, in this application, the switch power supply module is always connected to the output terminal of the AC voltage input module. The switch power supply module detects the output voltage of the AC voltage input module and thus... The AC voltage input module output voltage controls the operation of the controllable switch group, achieving the following effects: When DC voltage is applied, the voltage across the elevator motor is connected to the two input terminals of the DC voltage input module, and the output terminal of the DC voltage input module is connected to the input terminal of the voltage detection direct input module. Simultaneously, the output terminal of the AC voltage input module is not connected to the input terminal of the voltage detection direct input module. When AC voltage is applied, the voltage across the elevator motor is not connected to the two input terminals of the DC voltage input module, and the output terminal of the AC voltage input module is connected to the input terminal of the voltage detection direct input module. The DC voltage input module output terminal is not connected to the input terminal of the voltage detection direct input module. The switch power supply module design allows for direct control of the controllable switch group based on changes in the AC voltage input module output.

[0023] In this application, the switch power supply module includes: an isolation sensing unit, a comparison unit, and a switch power supply unit. The input terminal of the isolation sensing unit is connected to the output terminal of the AC voltage access module, the output terminal of the isolation sensing unit is connected to the input terminal of the comparison unit, and the output terminal of the comparison unit is connected to the control terminal of the switch power supply unit. The switch power supply unit supplies power to the switch switching control unit (which is the coil of relay RL1).

[0024] The isolation sensing unit includes an optocoupler U2 and a resistor R2. The AC voltage input module output terminal OUT1 is connected to the anode of the LED in optocoupler U2, the cathode of the LED in optocoupler U2 is grounded, one end of the SCR in optocoupler U2 is connected to the power supply VCC, and the other end of the SCR in optocoupler U2 is connected to the first terminal of resistor R2. The second terminal of resistor R2 is grounded, and the first terminal of resistor R2 is the output terminal of the isolation sensing unit. Because the output voltage at the AC voltage input module output terminal OUT1 may be large, the isolation sensing unit is used to protect the circuitry of the subsequent comparison unit and extend its service life.

[0025] The comparison unit includes a comparator U3, resistors R9 and R10. The first terminal of resistor R9 is connected to the power supply VCC, and the second terminal of resistor R9 is grounded through resistor R10. The second terminal of resistor R9 is also connected to the inverting input of comparator U3. The non-inverting input of comparator U3 is the input of the comparison unit, and the output terminal CTR of comparator U3 is the output of the comparison unit. Resistors R9 and R10 provide a reference voltage, thus enabling the comparison of the output voltage of the AC voltage input module (OUT1) with the reference voltage. When the reference voltage is larger, the comparison unit output terminal CTR outputs a high level, indicating that the AC voltage input module is connected to AC voltage, and the switching power supply unit is disconnected. When the reference voltage is smaller, the comparison unit output terminal CTR outputs a low level, indicating that the AC voltage input module is connected to DC voltage, and the switching power supply unit is closed.

[0026] The switching power supply unit includes: PMOS transistor Q2. The gate of PMOS transistor Q2 is the control terminal of the switching power supply unit. The source of PMOS transistor Q2 is grounded. The drain of PMOS transistor Q2 is connected to the negative terminal of the switching control unit. The positive terminal of the switching control unit is connected to the power supply VCC (providing 5V DC voltage).

[0027] Since the comparator unit can only receive low voltage (less than 10V), while the AC voltage input module or DC voltage input module may output a voltage of (20-50V), which exceeds the voltage that the comparator unit can receive, this application adopts an isolation sensing unit. The isolation sensing unit senses the voltage magnitude in an isolated manner, avoiding the transmission of a large voltage to the comparator unit and improving the protection of the comparator unit.

[0028] In this application, the AC voltage access module includes a rectifier unit and a first voltage regulator unit. The two input terminals of the rectifier unit are the two input terminals of the AC voltage access module, and the output terminal of the rectifier unit is connected to the input terminal of the first voltage regulator unit. The output terminal of the first voltage regulator unit is the output terminal of the AC voltage access module.

[0029] The rectifier unit includes a rectifier bridge BR1. The first and second input terminals of the rectifier bridge are the two input terminals of the rectifier unit, respectively. These terminals are connected to the two ends of the elevator motor (K1 and K2, respectively). The first output terminal of the rectifier bridge BR1 is the output terminal of the rectifier unit, and the second output terminal is grounded. The rectifier bridge BR1 converts AC voltage to DC voltage before outputting it.

[0030] The first voltage regulator unit includes a resistor R3. The first end of resistor R3 is connected to the output terminal of the rectifier unit, and the second end of resistor R3 is the output terminal of the first voltage regulator unit. Resistor R3 serves to regulate voltage.

[0031] Preferably, the DC voltage input module includes a differential amplifier unit, with its two input terminals serving as the two input terminals of the DC voltage input module, and its output terminal serving as the output terminal of the DC voltage input module. The differential amplifier unit includes resistors R5, R6, R7, and R8, and a differential amplifier chip U4. The first terminal of resistor R5 is one input terminal of the DC voltage input module, the first terminal of resistor R6 is the other input terminal of the DC voltage input module, the second terminal of resistor R5 is connected to the non-inverting input terminal of differential amplifier U4, the non-inverting input terminal of differential amplifier U4 is connected to the first terminal of resistor R8, the second terminal of resistor R8 is connected to the output terminal of differential amplifier U4, the output terminal of differential amplifier U4 serves as the output terminal of the differential amplifier unit, and the second terminal of resistor R6 is connected to the inverting input terminal of differential amplifier U4 and the first terminal of resistor R7. The second terminal of resistor R7 is grounded. The differential amplifier U4 used in the DC voltage input module of this application serves the following purpose: When the DC voltage is input to the module, the elevator motor is connected to a DC voltage. The differential amplifier U4 subtracts the voltages on both sides of the DC motor to obtain the voltage difference. When the voltage difference is 0, the elevator motor is either not powered or short-circuited, thus realizing the detection of two abnormalities: elevator motor not powered and elevator motor short-circuit, thereby improving the detection range. The amplification ratio can be adjusted by adjusting the resistance values ​​of resistors R5, R6, R7, and R8.

[0032] In this application, the voltage detection direct input module includes: a second voltage regulator unit, an indicator unit, and a switch control unit. The input terminal of the second voltage regulator unit is the input terminal of the voltage detection direct input module. The input terminal of the second voltage regulator unit is connected to the input terminal of the indicator unit. The output terminal of the indicator unit is connected to the positive terminal of the light-emitting part. The negative terminal of the light-emitting part is grounded through the switch control unit. The input terminal of the switch control unit is connected to the first output terminal of the control module. The second voltage regulator unit functions as a voltage regulator, the indicator unit displays that voltage is passing through, indicating that the elevator motor is being powered normally, and the switch control unit ensures that the light-emitting part is only turned on when detection is performed, avoiding power consumption by the light-emitting part when not in use and reducing energy consumption.

[0033] The light-emitting part of the direct input module and the sensing part of the inductive voltage detection module are in a silicon-inductive optocoupler U1. The light-emitting part is the light-emitting diode in the silicon-inductive optocoupler U1, and the sensing part is the silicon-inductive optocoupler U1. The resistance of the sensing part changes with the light intensity, thereby indirectly responding to the magnitude of the voltage applied at the light-emitting part.

[0034] The second voltage regulator unit includes a Zener diode D1 and a capacitor C1. The cathode of the Zener diode D1 is connected to the anode of the capacitor C1. The anode of the capacitor C1 is the input terminal of the second voltage regulator unit. The anode of the Zener diode D1 and the cathode of the capacitor C1 are grounded.

[0035] The prompting unit includes a resistor R4 and an LED D2. The first end of the resistor R4 is the input terminal of the prompting unit, the second end of the resistor R4 is connected to the anode of the LED D2, and the cathode of the LED D2 is the output terminal of the prompting unit.

[0036] The switch control unit includes: an NPN transistor Q1; the anode of the LED in the inductive silicon optocoupler U1 is connected to the cathode of the LED D2; the cathode of the LED in the inductive silicon optocoupler U1 is connected to the collector of the NPN transistor Q1; the emitter of the NPN transistor Q1 is grounded; and the base of the NPN transistor Q1 is the control terminal of the switch control unit. The NPN transistor Q1 is closed when a high level is applied to its base and open when a low level is applied to its base, thus enabling the LED in the inductive silicon optocoupler U1 to operate under the control of the control module.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An isolated detection type elevator motor power supply detection system, characterized in that, include: AC voltage input module, DC voltage input module, voltage detection direct input module, inductive voltage detection module, and control module; The two input terminals of the AC voltage access module are connected to the two ends of the elevator motor, the two input terminals of the DC voltage access module are connected to the two ends of the elevator motor, the output terminal of the AC voltage access module or the output terminal of the DC voltage access module is connected to the input terminal of the voltage detection direct input module, and the output terminal of the inductive voltage detection module is connected to the input terminal of the control module. The direct input module has a light-emitting part inside its input terminal, and the inductive voltage detection module has a sensing part inside its input terminal. The light-emitting part and the sensing part are arranged opposite to each other, and the sensing part is used to sense the light intensity of the light-emitting part.

2. The isolated detection type elevator motor power supply detection system according to claim 1, characterized in that, Also includes: Controlled switchgear and switch power supply module; The controllable switch assembly includes: a switch switching control unit, a first normally open switch, a second normally open switch, a third normally open switch, and a normally closed switch; the switch switching control unit controls the operation of the first normally open switch, the second normally open switch, the third normally open switch, and the normally closed switch, and the switch power supply module supplies power to the switch switching control unit; One input terminal of the AC voltage access module is connected to one input terminal of the DC voltage access module via a first normally open switch; the other input terminal of the AC voltage access module is connected to the other input terminal of the DC voltage access module via a second normally open switch; the DC voltage access module is connected to the input terminal of the voltage detection direct input module via a third normally open switch; the output terminal of the AC voltage access module is connected to the input terminal of the voltage detection direct input module via a normally closed switch. The control terminal of the switch power supply module is connected to the output terminal of the AC voltage input module.

3. The isolated detection type elevator motor power supply detection system according to claim 2, characterized in that, The switching power supply module includes: an isolation sensing unit, a comparator unit, and a switching power supply unit. The input terminal of the isolation sensing unit is connected to the output terminal of the AC voltage access module, the output terminal of the isolation sensing unit is connected to the input terminal of the comparator unit, and the output terminal of the comparator unit is connected to the control terminal of the switching power supply unit. The switching power supply unit supplies power to the switching control unit.

4. The isolated detection type elevator motor power supply detection system according to claims 1 to 3, characterized in that, The AC voltage access module includes a rectifier unit and a first voltage regulator unit. The two input terminals of the rectifier unit are the two input terminals of the AC voltage access module, and the output terminal of the rectifier unit is connected to the input terminal of the first voltage regulator unit. The output terminal of the first voltage regulator unit is the output terminal of the AC voltage access module.

5. The isolated detection type elevator motor power supply detection system according to claim 4, characterized in that, The DC voltage input module includes a differential amplifier unit, whose two input terminals are the two input terminals of the DC voltage input module, and whose output terminal is the output terminal of the DC voltage input module.

6. The isolated detection type elevator motor power supply detection system according to claims 1 to 3, characterized in that, The voltage detection direct input module includes: a second voltage regulator unit, a prompting unit, and a switch control unit. The input terminal of the second voltage regulator unit is the input terminal of the voltage detection direct input module. The input terminal of the second voltage regulator unit is connected to the input terminal of the prompting unit. The output terminal of the prompting unit is connected to the positive terminal of the light-emitting part. The negative terminal of the light-emitting part is grounded through the switch control unit. The input terminal of the switch control unit is connected to the first output terminal of the control module.

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