Detection circuit

Abstract

The embodiment of the invention relates to the field of elevators, and provides a detection circuit, which is used in an elevator, and comprises a power supply module used for providing a first power supply signal; the switch control module is electrically connected with the power supply module, receives the first power supply signal, generates and outputs a second power supply signal under the control of the control signal, and generates and outputs a third power supply signal under the control of the detection signal; the detection module detects the third power supply signal and gives an alarm when the third power supply signal is abnormal; and the brake module is electrically connected with the switch control module and receives the second power supply signal to control the elevator to brake, so that the switch control module can be conveniently detected.

Description

Technical Field

[0001] The disclosed embodiments relate to the field of elevators, and in particular to a detection circuit. Background Art

[0002] As the requirements for integration, cost, efficiency, etc. of power supply products become higher and higher, more and more power supply products will be controlled by semiconductor devices due to their high switching frequency, low loss, long life and other characteristics. While semiconductor devices bring the above advantages, their own failure cannot be directly detected. The common failure mode of semiconductor devices is that the device is always on after overcurrent, which will bring certain risks. In some special industries, its failure may even lead to serious safety accidents.

[0003] Semiconductor devices are an essential part of the switch control module of the elevator. Therefore, it is necessary to provide a detection circuit that can at least detect whether the switch control module in the elevator fails. Summary of the invention

[0004] The embodiment of the present disclosure provides a detection circuit used in an elevator, which can at least facilitate the detection of a switch control module.

[0005] According to some embodiments of the present disclosure, on the one hand, the embodiments of the present disclosure provide a detection circuit for use in an elevator, including: a power supply module, the power supply module is used to provide a first power supply signal; a switch control module, the switch control module is electrically connected to the power supply module, receives the first power supply signal, generates and outputs a second power supply signal under the control of the control signal, and generates and outputs a third power supply signal under the control of the detection signal; a detection module, the detection module detects the third power supply signal and issues an alarm when the third power supply signal is abnormal; and a braking module, the braking module is electrically connected to the switch control module, receives the second power supply signal to control the braking of the elevator.

[0006] In some embodiments, the switch control module includes: a control unit, which generates the control signal or the detection signal; a switch unit, which is electrically connected to the control unit and is controlled by the control unit to generate the second power signal or the third power signal.

[0007] In some embodiments, the power module includes a positive terminal and a negative terminal, and the switch unit includes: a first PMOS tube, the gate of the first PMOS tube is electrically connected to the control unit, the source is electrically connected to the negative terminal of the power module, and the drain is electrically connected to the braking module.

[0008] In some embodiments, the switch unit also includes: a second PMOS tube, the gate of the second PMOS tube is electrically connected to the detection module, the source is electrically connected to the braking module, and the drain is electrically connected to the positive end of the power module; a third PMOS tube, the gate of the third PMOS tube is electrically connected to the detection module, the source is electrically connected to the braking module, and the drain is electrically connected to the drain of the first PMOS tube.

[0009] In some embodiments, the control unit includes: a first control signal terminal, the first control signal terminal is electrically connected to the gate of the first PMOS tube, and outputs a first control signal and a first detection signal; a second control signal terminal, the second control signal terminal is electrically connected to the gate of the second PMOS tube, and outputs a second control signal and a second detection signal, the second control signal controls the second PMOS tube to be turned on when the first control signal controls the first PMOS tube to be turned on, and the second detection signal controls the second PMOS tube to be turned off; a third control signal terminal, the third control signal terminal is electrically connected to the gate of the third PMOS tube, and outputs a third control signal and a third detection signal, the third control signal When the first control signal controls the first PMOS tube to be turned on, the third PMOS tube is controlled to be turned on, and the third control signal controls the third PMOS tube to be turned off; the detection module detects the voltage of the source and the drain of the first PMOS tube, the second PMOS tube and the third PMOS tube, and issues an alarm when any one of the first PMOS tube, the second PMOS tube and the third PMOS tube is abnormal; wherein, when the second detection signal controls the second PMOS tube to be turned off, the first detection signal controls the first PMOS tube to be turned on, and when the third detection signal controls the third PMOS tube to be turned off, the first detection signal controls the first PMOS tube to be turned on.

[0010] In some embodiments, the second detection signal controlling the second PMOS transistor and the third detection signal controlling the third PMOS transistor are not turned on at the same time.

[0011] In some embodiments, the time during which the second detection signal controls the second PMOS tube to be disconnected is greater than the time during which the first detection signal controls the first PMOS tube to be turned on, and the time during which the third detection signal controls the third PMOS tube to be disconnected is greater than the time during which the first detection signal controls the first PMOS tube to be turned on.

[0012] In some embodiments, the control signal and the detection signal are PWM signals, wherein a duty cycle of the control signal is greater than a duty cycle of the detection signal.

[0013] In some embodiments, the power module includes: an AC power supply, which is used to provide AC power; and a rectifier bridge, which is electrically connected to the AC power supply, receives the AC power, generates and outputs DC power.

[0014] In some embodiments, the power module further includes: a switch group connected between the AC power supply and the rectifier bridge.

[0015] The technical solution provided by the embodiments of the present disclosure has at least the following advantages: on the one hand, the switch control module can be detected by the detection module, thereby making the switch control module detectable; on the other hand, when the switch control module is detected, the control of the brake module will not be affected. In this way, the control of the brake module will not be affected during the detection, thereby reducing the safety risks in the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, and these exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A module diagram of a detection circuit provided by an embodiment of the present disclosure;

[0018] Figure 2 A circuit diagram of a detection circuit provided in one embodiment of the present disclosure;

[0019] Figure 3 A timing diagram of a detection circuit provided in accordance with an embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] As can be seen from the background technology, in traditional solutions, we will use contactor / relay products for power control. The advantage is that its detection is simple and direct (auxiliary contact detection), and the disadvantage is long response time, high loss, short life, etc.

[0021] Therefore, for power supply control, an improvement scheme needs to be proposed to improve the failure detectability while retaining the advantages of semiconductor devices and ensure that the power supply can still be controlled after the failure.

[0022] The disclosed embodiment provides a detection circuit for use in an elevator. On the one hand, the switch control module can be detected by the detection module, thereby making the switch control module detectable; on the other hand, when the switch control module is detected, the control of the brake module will not be affected. In this way, the control of the brake module will not be affected during the detection, thereby reducing the safety risks in the detection process.

[0023] Terms such as first or second can be used to describe various components, but these components are not limited by the above terms. The above terms are used to distinguish one component from another component, for example, without departing from the scope of the concept according to the present disclosure, a first component can be referred to as a second component, and similarly, a second component can be referred to as a first component.

[0024] In addition, "connected / coupled" means that one component is directly electrically coupled to another component or is indirectly electrically coupled through another component. The singular form may include the plural form unless explicitly stated in the sentence. In addition, "include / comprise" or "includes / comprises" used in this specification indicates that one or more components, steps, operations, and elements exist or have been added. The specific structural or functional descriptions of the examples of the implementation of the concepts disclosed in this specification are only illustrated to describe the examples of the implementation of the concepts, and the examples of the implementation of the concepts can be implemented in various forms, but these descriptions are not limited to the examples of the implementation described in this specification.

[0025] According to the concept, various modifications and changes can be applied to the examples of the embodiments, so that the examples of the embodiments will be illustrated in the drawings and described in the specification. However, the examples of the embodiments according to the concept are not limited to the specific embodiments, but include all changes, equivalents or replacements included in the spirit and technical scope of the present disclosure.

[0026] It should be understood that when an element is described as being "coupled" or "connected" to another element, the element may be directly coupled or directly connected to the other element, or may be coupled or connected to the other element through a third element. Conversely, it should be understood that when an element is referred to as being "directly coupled to" or "directly coupled to" another element, no other element is placed between them. Other expressions describing the relationship between components (i.e., "between" and "directly between" or "adjacent to" and "directly adjacent to") need to be interpreted in the same manner.

[0027] The terms used in this specification are only used to describe specific examples of the embodiments and are not intended to limit the present disclosure. If there is no clear opposite meaning in the context, the singular form may include the plural form. In this specification, it should be understood that the term "including" or "having" indicates the presence of the features, quantities, steps, operations, components, parts or combinations thereof described in the specification, but the possibility of the presence or addition of one or more other features, quantities, steps, operations, components, parts or combinations thereof cannot be precluded.

[0028] If there is no contrary definition, all terms (including technical terms or scientific terms) used herein have the same meaning as those generally understood by ordinary technicians in the field. If the terms defined in the commonly used dictionary are not clearly defined in this specification, they should be interpreted as having the same meaning as in the context of the relevant technology, and not interpreted as ideal or overly formal meanings.

[0029] Descriptions of well-known components and processing techniques may be omitted so as not to unnecessarily obscure the embodiments of the disclosure.

[0030] Throughout the specification, the same reference numerals refer to the same elements. Thus, even if a reference numeral is not mentioned or described with reference to one figure, it may be mentioned or described with reference to another figure. Furthermore, even if a reference numeral is not shown in one figure, it may be mentioned or described with reference to another figure.

[0031] In addition, the logic level of the signal may be different or opposite to the described logic level. For example, a signal described as having a logic "high" level may alternatively have a logic "low" level, and a signal described as having a logic "low" level may alternatively have a logic "high" level.

[0032] The following will describe the various embodiments of the present disclosure in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present disclosure, many technical details are provided in order to enable the reader to better understand the present disclosure. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present disclosure can be implemented.

[0033] refer to Figures 1 to 3 , Figure 1 A module diagram of a detection circuit provided in an embodiment of the present disclosure, Figure 2 A circuit diagram of a detection circuit provided by an embodiment of the present disclosure, Figure 3 A timing diagram of a detection circuit provided in accordance with an embodiment of the present disclosure.

[0034] In some embodiments, the detection circuit used in an elevator may include: a power module 100, and the power module 100 is used to provide a first power signal.

[0035] The detection circuit may also include: a switch control module 101, which is electrically connected to the power module 100, receives a first power signal, generates and outputs a second power signal under the control of the control signal, and generates and outputs a third power signal under the control of the detection signal.

[0036] The detection circuit may further include: a detection module 102, which detects the third power signal and issues an alarm when the third power signal is abnormal.

[0037] The detection circuit may further include: a braking module 103, which is electrically connected to the switch control module 101 and receives a second power supply signal to control the elevator braking.

[0038] The embodiment of the present disclosure provides a detection circuit for use in an elevator. On the one hand, the switch control module 101 can be detected by the detection module 102, so that the switch control module 101 can be detected; on the other hand, when the switch control module 101 is detected, the control of the brake module 103 will not be affected. In this way, the control of the brake module 103 will not be affected during the detection, thereby reducing the safety risks in the detection process.

[0039] In some embodiments, the power module 100 may include: an AC power supply 110, the AC power supply 110 is used to provide AC power; a rectifier bridge 120, the rectifier bridge 120 is electrically connected to the AC power supply 110, receives AC power, generates and outputs DC power. It is understandable that the power module 100 is provided to include the AC power supply 110 and the rectifier bridge 120, so that power can be directly provided through the power grid. For the power grid, the power grid provides AC power, but for the detection circuit, DC power is required. Therefore, the AC power provided by the power grid is converted into DC power by providing the rectifier bridge 120, thereby outputting the first power signal.

[0040] As for the rectifier bridge 120 , the rectifier bridge 120 is composed of four diodes, which can allow only the positive half-cycle waveform to pass through the circuit, while the negative half-cycle waveform is shielded, thereby outputting a voltage signal that is approximately direct current.

[0041] In some embodiments, the power supply module 100 may also directly provide a DC power supply, and by providing a DC power supply, the voltage of the adaptive braking module 103 may be directly output, thereby reducing the layout of the detection circuit.

[0042] In some embodiments, the power module further includes: a switch group 130, and the switch group 130 is connected between the AC power supply 110 and the rectifier bridge 120. By further providing the switch group 130 between the AC power supply 110 and the rectifier bridge 120, it is possible to control whether the passage between the AC power supply 110 and the rectifier bridge 120 is connected through the switch group 130, so that when the detection module issues an alarm, the passage between the AC power supply 110 and the rectifier bridge 120 can be disconnected through the switch group 130, thereby avoiding abnormal braking of the brake module 103 and avoiding safety problems of the elevator.

[0043] The switch control module 101 may include: a control unit 111, the control unit 111 generates a control signal or a detection signal; a switch unit 121, the switch unit 121 is electrically connected to the control unit 111, and is controlled by the control unit 111 to generate a second power signal or a third power signal. The control unit 111 is used to control whether the switch unit 121 is turned on, and the control unit is also used to control the power signal generated by the switch unit 121, so as to adapt the detection function or the control function.

[0044] In some embodiments, the control unit 111 may be a controller capable of outputting a PWM (Pulse-width modulation) signal, and the duty cycle of the PWM signal is adjusted to correspond to the control signal and the detection signal.

[0045] Combined with reference Figure 2 and Figure 3 The control signal and the detection signal are PWM signals, wherein the duty cycle of the control signal is greater than the duty cycle of the detection signal. For the switch unit 121, the greater the duty cycle of the control signal, the greater the voltage value of the second power supply signal output by the switch unit 121. Moreover, setting the duty cycle of the detection signal to be small can, on the one hand, make the voltage value of the third power supply signal small, thereby avoiding controlling the braking module 103 when detection is required. On the other hand, it can also improve the safety of the detection module 102. By reducing the voltage value of the third power supply signal, the risk of detection can be reduced during the detection process.

[0046] For example, when the AC power supply 110 provides a voltage of 220V, the voltage output through the rectifier bridge 120 may be 330V. Then, for the brake module 103 of the elevator, the brake module 103 may not be applicable. Therefore, the control signal is set to a PWM signal. The voltage value output by the switch control module can be controlled by the PWM signal. The voltage values ​​of the second power signal and the third power signal can be controlled by adjusting the duty cycle of the PWM signal, so that the voltage value received on the brake module is an adaptive voltage value.

[0047] In some embodiments, the power module 100 includes a positive terminal and a negative terminal, and the switch unit 121 includes: a first PMOS tube T1, a gate of the first PMOS tube T1 is electrically connected to the control unit 111, a source is electrically connected to the negative terminal of the power module 100, and a drain is electrically connected to the brake module 103. By setting the switch unit 121 to include the first PMOS tube T1, the gate of the first PMOS tube T1 is turned on when receiving a low level and is turned off when receiving a high level, thereby correspondingly providing the second power signal or the third power signal.

[0048] The switch unit 121 may further include: a second PMOS tube T2, the gate of the second PMOS tube T2 is electrically connected to the detection module 102, the source is electrically connected to the braking module 103, and the drain is electrically connected to the positive terminal of the power module 100; a third PMOS tube T3, the gate of the third PMOS tube T3 is electrically connected to the detection module 102, the source is electrically connected to the braking module 103, and the drain is electrically connected to the drain of the first PMOS tube T1. For the switch unit 121, the second PMOS tube T2 and the third PMOS tube T3 are also provided to improve the reliability of the switch control module 101 controlling the braking module 103, thereby avoiding the situation where the braking module 103 is abnormally braked.

[0049] In some embodiments, the braking module 103 is enabled at a high level. For the switch unit 121, when it is necessary to control the braking module 103, it is necessary to simultaneously control the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3 to be turned on before the braking module 103 can be controlled to be enabled. For the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3, when the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3 are abnormal, the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3 will be in a normally turned-on state. Therefore, setting the switch unit 121 to include the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3 can improve the reliability of controlling the braking module 103.

[0050] It should be noted that the above-mentioned normally conducting means that no matter what signal the gate of the first PMOS transistor T1 receives, the path between the source and the drain of the first PMOS transistor T1 is in the conducting state.

[0051] The control unit 111 may include: a first control signal terminal 131, the first control signal terminal 131 is electrically connected to the gate of the first PMOS tube T1, and outputs a first control signal and a first detection signal; a second control signal terminal 141, the second control signal terminal 141 is electrically connected to the gate of the second PMOS tube T2, and outputs a second control signal and a second detection signal, the second control signal controls the second PMOS tube T2 to be turned on when the first control signal controls the first PMOS tube T1 to be turned on, and the second detection signal controls the second PMOS tube T2 to be turned off; a third control signal terminal 151, the third control signal terminal 151 is electrically connected to the gate of the third PMOS tube T3, and outputs a third control signal and a third detection signal, The third control signal controls the third PMOS tube T3 to be turned on when the first control signal controls the first PMOS tube to be turned on, and the third control signal controls the third PMOS tube T3 to be turned off; the detection module 102 detects the voltages of the source and the drain of the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3, and issues an alarm when any one of the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3 is abnormal; wherein, during the period when the second detection signal controls the second PMOS tube T2 to be turned off, the first detection signal controls the first PMOS tube T1 to be turned on, and during the period when the third detection signal controls the third PMOS tube T3 to be turned off, the first detection signal controls the first PMOS tube T1 to be turned on.

[0052] It can be understood that when control is required, the first control signal terminal 131 controls whether the first PMOS tube T1 is turned on, and for the first control signal terminal 131, it is also controlled whether the second power signal or the third power signal is output through the first PMOS tube T1, the second control signal terminal 141 controls whether the second PMOS tube T2 is turned on, and the third control signal terminal 151 controls whether the third PMOS tube T3 is turned on. When the brake module 103 needs to be controlled, the first PMOS tube T1, the second PMOS tube T2 and the third PMOS tube T3 need to be controlled at the same time. The MOS tube T3 is turned on at the same time; when detection is needed, when the first PMOS tube T1 is detected, no matter what state the second PMOS tube T2 and the third PMOS tube T3 are in, the detection can be performed. When the second PMOS tube T2 is detected, the first PMOS tube T1 needs to be controlled to be turned on, so as to provide a power supply voltage to the source and drain of the second PMOS tube T2 to complete the detection. When the third PMOS tube T3 is detected, the first PMOS tube T1 needs to be controlled to be turned on, so as to provide a voltage at the source and drain of the third PMOS tube T3 to complete the detection.

[0053] When the control unit 111 includes the first control signal terminal 131 , the second control signal terminal 141 and the third control signal terminal 151 , the first control signal, the second control signal and the third control signal constitute a control signal, and the first detection signal, the second detection signal and the third detection signal constitute a detection signal.

[0054] In some embodiments, the second detection signal controls the second PMOS tube T2 and the third detection signal controls the third PMOS tube T3 to be turned on at different times. For the second PMOS tube T2 and the third PMOS tube T3, the source and drain of the second PMOS tube T2 are connected between the positive terminal of the braking module 103 and the power module 100, and the source and drain of the third PMOS tube T3 are connected between the negative terminal of the braking module 103 and the power module 100. When the second PMOS tube T2 and the third PMOS tube T3 are turned on at the same time, the entire loop is disconnected, and there will be no voltage signal on the second PMOS tube T2 and the third PMOS tube T3, and the detection cannot be completed smoothly. Therefore, when detecting the second PMOS tube T2 and the third PMOS tube T3, it is necessary to control the one that is not detected to be turned on, so as to provide a loop for the detection.

[0055] In some embodiments, the time when the second detection signal controls the second PMOS tube T2 to be disconnected is greater than the time when the first detection signal controls the first PMOS tube T1 to be turned on, and the time when the third detection signal controls the third PMOS tube T3 to be disconnected is greater than the time when the detection signal controls the first PMOS tube T1 to be turned on. By setting the time when the second detection signal controls the second PMOS tube T2 to be disconnected to be greater than the time when the first detection signal controls the first PMOS tube T1 to be turned on, it is possible to avoid the brake module 103 from receiving a voltage when the second PMOS tube T2 is detected, thereby avoiding abnormal startup of the brake module 103; similarly, setting the time when the third detection signal controls the third PMOS tube T3 to be disconnected to be greater than the time when the detection signal controls the first PMOS tube T1 to be turned on, it is possible to avoid the brake module 103 from receiving a voltage when the third PMOS tube T3 is detected, thereby avoiding abnormal startup of the brake module 103.

[0056] In some embodiments, the detection module 102 includes: a first detection unit 112, one detection end of the first detection unit 112 is connected to the positive terminal of the power module 100, and the other detection end is connected to the drain of the first PMOS tube T1. When the first PMOS tube T1 is detected, the first PMOS tube T1 can be controlled to be turned on, and then the voltage value detected by the first detection unit 112 is compared with the voltage value generated by the first PMOS tube T1 corresponding to the duty cycle of the first detection signal to determine whether the first PMOS tube T1 is abnormal.

[0057] In some embodiments, the detection module 102 may further include: a second detection unit 122 and a third detection unit 132, wherein one detection end of the second detection unit 122 is connected to the source of the second PMOS tube T2, and the other detection end is connected to the drain of the second PMOS tube T2; one detection end of the third detection unit 132 is connected to the source of the third PMOS tube T3, and the other detection end is connected to the drain of the third PMOS tube T3. The second PMOS tube T2 may be disconnected, and the third PMOS tube T3 may be judged to be normally turned on by judging whether the second detection unit 122 can detect a voltage, the third PMOS tube T3 may be disconnected, and the third PMOS tube T2 may be judged to be normally turned on by judging whether the third detection unit 132 can detect a voltage, and the second PMOS tube T2 and the third PMOS tube T3 may be judged to be abnormal by judging whether the second PMOS tube T2 and the third PMOS tube T3 are abnormal by judging whether the voltage values ​​detected on the second detection unit 122 and the third detection unit 132.

[0058] The following will be combined Figures 1 to 3 The detection circuit provided by the embodiment of the present disclosure is described in detail: when the braking module 103 needs to work, the first PMOS tube is controlled to be turned on through the first control signal terminal 131, and the first control signal output by the first control signal terminal 131 can be a PWM signal, thereby controlling the voltage value output by the first PMOS tube T1, and at the same time, the second control signal terminal 141 and the third control signal terminal 151 control the second PMOS tube T2 and the third PMOS tube T3 to be turned on, thereby outputting a second power supply signal to control the elevator braking; when the switch control module 101 needs to be detected, when the first PMOS tube T1 is detected, the first PMOS tube T2 is controlled by the first detection signal. The voltage of the MOS tube T1 is measured, and the voltage is detected by the first detection unit 112. At this time, no matter what state the second PMOS tube T2 and the third PMOS tube T3 are in, it will not affect the detection of the first PMOS tube T1. When the second PMOS tube T2 needs to be detected, the first PMOS tube T1 and the third PMOS tube T3 need to be controlled to be turned on, and the second PMOS tube T2 needs to be turned off, and the detection is performed through the second detection unit 122; when the third PMOS tube T3 needs to be detected, the first PMOS tube T1 and the second PMOS tube T2 need to be controlled to be turned on, and the third PMOS tube T3 needs to be turned off, and the detection is performed through the third detection unit 132.

[0059] In some embodiments, the braking module 103 may control the elevator braking after receiving a high level signal, where the elevator braking may refer to: slowing down, stopping or keeping the elevator in a stopped state.

[0060] In some embodiments, the detection circuit may further include: a first capacitor C1, one end of the first capacitor C1 is connected to the positive terminal of the power module 100, and the other end is connected to the negative terminal of the power module 100; a second capacitor C2, one end of the second capacitor C2 is connected to the positive terminal of the power module 100, and the other end is connected to the drain of the first PMOS tube T1; the first capacitor C1 and the second capacitor C2 play a filtering role to improve the reliability of the detection circuit.

[0061] The detection circuit may further include: a thermistor R1 , one end of the thermistor R1 is connected to the positive terminal of the power module 100 , and the other end is connected to the brake module 103 . The reliability of the detection circuit may be improved by providing the thermistor R1 .

[0062] The detection circuit may further include: a first diode D1 , one end of which is connected to the positive terminal of the power module 100 , and the other end of which is connected to the drain of the first PMOS tube T1 , and the first diode D1 plays a role of current storage.

[0063] The detection circuit may further include: a voltage stabilizing diode D2, wherein the cathode of the voltage stabilizing diode D2 is connected to the anode terminal of the power module 100, a second diode D3, wherein the anode of the second diode D3 is connected to the anode terminal of the voltage stabilizing diode D2, and the cathode of the second diode D3 is connected to the drain terminal of the first PMOS tube T1, so that the voltage stability is improved by the voltage stabilizing diode D2 and the second diode D3.

[0064] The embodiment of the present disclosure provides a detection circuit for use in an elevator. On the one hand, the switch control module 101 can be detected by the detection module 102, so that the switch control module 101 can be detected; on the other hand, when the switch control module 101 is detected, the control of the brake module 103 will not be affected. In this way, the control of the brake module 103 will not be affected during the detection, thereby reducing the safety risks in the detection process.

[0065] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of the present disclosure, so the protection scope of the embodiments of the present disclosure shall be based on the scope defined in the claims.

Claims

1. A detection circuit used in an elevator, characterized in that: include: A power module, wherein the power module is used to provide a first power signal; a switch control module, the switch control module being electrically connected to the power module, receiving the first power signal, generating and outputting a second power signal under the control of the control signal, and generating and outputting a third power signal under the control of the detection signal; a detection module, wherein the detection module detects the third power signal and issues an alarm when the third power signal is abnormal; A braking module is electrically connected to the switch control module and receives the second power supply signal to control the braking of the elevator.

2. The detection circuit according to claim 1, characterized in that: The switch control module includes: a control unit, wherein the control unit generates the control signal or the detection signal; A switch unit, wherein the switch unit is electrically connected to the control unit and is controlled by the control unit to generate the second power signal or the third power signal.

3. The detection circuit according to claim 2, characterized in that: The power module includes a positive terminal and a negative terminal, and the switch unit includes: a first PMOS tube, a gate of the first PMOS tube is electrically connected to the control unit, a source is electrically connected to the negative terminal of the power module, and a drain is electrically connected to the brake module.

4. The detection circuit according to claim 3, characterized in that: The switch unit further comprises: a second PMOS tube, wherein a gate of the second PMOS tube is electrically connected to the detection module, a source of the second PMOS tube is electrically connected to the braking module, and a drain of the second PMOS tube is electrically connected to the positive terminal of the power module; A third PMOS tube, wherein a gate of the third PMOS tube is electrically connected to the detection module, a source of the third PMOS tube is electrically connected to the braking module, and a drain of the third PMOS tube is electrically connected to the drain of the first PMOS tube.

5. The detection circuit according to claim 4, characterized in that: The control unit comprises: A first control signal terminal, the first control signal terminal is electrically connected to the gate of the first PMOS tube, and outputs a first control signal and a first detection signal; a second control signal terminal, the second control signal terminal being electrically connected to the gate of the second PMOS tube, outputting a second control signal and a second detection signal, wherein the second control signal controls the second PMOS tube to be turned on when the first control signal controls the first PMOS tube to be turned on, and the second detection signal controls the second PMOS tube to be turned off; a third control signal terminal, the third control signal terminal being electrically connected to the gate of the third PMOS tube, outputting a third control signal and a third detection signal, wherein the third control signal controls the third PMOS tube to be turned on when the first control signal controls the first PMOS tube to be turned on, and the third control signal controls the third PMOS tube to be turned off; the detection module detects the voltages of the source and the drain of the first PMOS tube, the second PMOS tube and the third PMOS tube, and issues an alarm when any one of the first PMOS tube, the second PMOS tube and the third PMOS tube is abnormal; The second detection signal controls the second PMOS tube to be turned off while the first detection signal controls the first PMOS tube to be turned on; the third detection signal controls the third PMOS tube to be turned off while the first detection signal controls the first PMOS tube to be turned on.

6. The detection circuit according to claim 5, characterized in that: The second detection signal controls the second PMOS tube and the third detection signal controls the third PMOS tube to be turned on at different times.

7. The detection circuit according to claim 5, characterized in that: The time during which the second detection signal controls the second PMOS tube to be disconnected is longer than the time during which the first detection signal controls the first PMOS tube to be turned on. The time during which the third detection signal controls the third PMOS tube to be disconnected is longer than the time during which the first detection signal controls the first PMOS tube to be turned on.

8. The detection circuit according to claim 2, characterized in that: The control signal and the detection signal are PWM signals, wherein a duty cycle of the control signal is greater than a duty cycle of the detection signal.

9. The detection circuit according to claim 1, characterized in that: The power module comprises: An alternating current power supply, the alternating current power supply being used to provide alternating current; A rectifier bridge is electrically connected to the AC power source, receives the AC power, generates and outputs DC power.

10. The detection circuit according to claim 9, characterized in that: The power module also includes: A switch group is connected between the AC power supply and the rectifier bridge.

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