Power panel, machine activation control method and elevator system
By integrating the main circuit module, power supply module, and logic control chip into a power board, the problem of power board failure caused by complex wiring in elevator control cabinets was solved, achieving stable power supply and miniaturized design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGDONG WINONE ELEVATOR
- Filing Date
- 2025-01-24
- Publication Date
- 2026-07-24
AI Technical Summary
Elevator control cabinet wiring is complex, and it is easy to connect the input wires incorrectly during installation, which may lead to excessively high input voltage on the power board and cause an accidental explosion.
Design a power board that integrates a main circuit module, a power supply module, and a logic control chip. The logic control chip detects the voltage and controls the voltage conversion between the main circuit module and the power supply module to ensure that the input voltage meets the requirements before power is supplied.
This avoids power board explosion accidents caused by improper voltage connection, and the power board is small in size and light in weight, and can stably supply power to the elevator system.
Smart Images
Figure CN122456898A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of elevator manufacturing technology, and more specifically, to a power supply board, a start-up control method, and an elevator system. Background Technology
[0002] The internal wiring of elevator control cabinets is numerous and complex. Installation and maintenance personnel at the elevator site inevitably disassemble the control cabinet, and during reinstallation, they may connect the input wires incorrectly. If power is applied again after incorrect connection, the input voltage to the power board may exceed the rated voltage, potentially causing the control cabinet to explode. Summary of the Invention
[0003] This application provides a power board, a start-up control method, and an elevator system, which can not only supply power to various electrical devices in the elevator, but also have a small size and light weight. It can also control the start-up of the power board to avoid the power board from exploding due to the connection of an inappropriate voltage.
[0004] This application provides a power supply board for use in an elevator system, comprising:
[0005] Logic control chip, main circuit module and power supply module;
[0006] The main circuit module is connected to the power grid, the power supply module and the logic control chip respectively, and is configured to connect to the AC power provided by the power grid. Under the control of the logic control chip, the AC power is converted into AC-DC voltage and the converted voltage is output.
[0007] The power module is configured to perform DC-DC voltage conversion on the AC-DC voltage conversion result under the control of the logic control chip, and output the DC-DC voltage conversion result to the electrical equipment of the elevator system.
[0008] The logic control chip is configured to control the main circuit module to perform AC-DC voltage conversion and to control the power supply module to perform DC-DC voltage conversion.
[0009] In one exemplary embodiment, the main circuit module includes a first branch circuit, a second branch circuit, a rectifier circuit, and a bus capacitor; wherein, one end of the first branch circuit is connected to the phase line of the AC power supply, the other end of the first branch circuit is connected to the first input terminal of the rectifier circuit, and the second input terminal of the rectifier circuit is connected to the neutral line of the AC power supply; the two output terminals of the rectifier circuit are respectively connected to the two ends of the bus capacitor; the first branch circuit and the second branch circuit are connected in parallel; the two ends of the bus capacitor serve as the two output terminals of the main circuit module;
[0010] The logic control chip controls the main circuit module to connect to the AC power and controls the power supply module to perform DC voltage conversion, including:
[0011] If the AC power meets the mains power requirements and the phase of the AC power meets a preset phase, the first branch circuit is controlled to conduct to pre-charge the bus capacitor through the rectifier circuit; if the voltage on the bus capacitor is detected to be equal to the preset bus voltage, the second branch circuit is controlled to conduct to charge the bus capacitor through the rectifier circuit; after charging continues for a first preset time, the first branch circuit is controlled to disconnect; after the first branch circuit is disconnected and a second preset time is waited, the power module is controlled to perform DC-DC voltage conversion.
[0012] The preset bus voltage is determined based on the effective value of the alternating current.
[0013] In one exemplary embodiment, the first branch circuit includes a first switching device and a current-limiting resistor connected in series;
[0014] The second branch circuit includes a second switching device;
[0015] The logic control chip controls the first branch circuit to conduct so as to precharge the bus capacitor through the rectifier circuit, including: controlling the first switching device to conduct the first branch circuit so as to precharge the bus capacitor through the current limiting resistor and the rectifier circuit;
[0016] The logic control chip controls the second branch circuit to conduct so as to charge the bus capacitor through the rectifier circuit, including: controlling the second switching device to conduct the second branch circuit so as to charge the bus capacitor through the rectifier circuit.
[0017] This application provides a power-on control method, applied to the logic control chip of the power board described in any of the above embodiments, comprising:
[0018] After powering on, check whether the AC power supplied by the grid meets the mains power requirements;
[0019] When the AC power meets the mains power requirements, the main circuit module is controlled to perform AC-DC voltage conversion.
[0020] In one exemplary embodiment, controlling the main circuit module to connect to the AC power when the AC power meets the mains power requirements includes:
[0021] If the AC current meets the mains power requirements and the phase of the AC current meets a preset phase, the first branch circuit is controlled to conduct to pre-charge the bus capacitor through the rectifier circuit. If the bus voltage on the bus capacitor is detected to be equal to a preset bus voltage, the second branch circuit is controlled to conduct to charge the bus capacitor through the rectifier circuit. After charging continues for a first preset time, the first branch circuit is controlled to disconnect. The preset bus voltage is determined based on the effective value of the AC current.
[0022] In one exemplary embodiment, after the first branch circuit is disconnected, the following is further included:
[0023] After waiting for a second preset time, the power module is controlled to start DC-DC voltage conversion.
[0024] In one exemplary embodiment, detecting whether the AC power supplied by the power grid meets the mains power requirements includes:
[0025] The alternating current signal is sampled according to a preset sampling frequency;
[0026] The sampling data is judged to be normal based on the preset sampling frequency, the maximum total number of samples in one cycle of the AC current, and the minimum total number of samples in one cycle of the AC current.
[0027] Under normal sampling conditions, the effective voltage value of the AC current is calculated based on the instantaneous voltage value of the sampling point and the actual total number of samples in one cycle of the AC current; the frequency of the AC current is calculated based on the preset sampling frequency and the actual total number of samples.
[0028] If the effective voltage and frequency of the alternating current meet the mains power standards, then the alternating current is deemed to meet the mains power requirements.
[0029] In one exemplary embodiment, determining whether the sampling data is normal based on the preset sampling frequency, the maximum total number of samples in one cycle of the AC current, and the minimum total number of samples in one cycle of the AC current includes:
[0030] The actual total number of samples for one cycle of the AC current is calculated based on the preset sampling frequency and the cycle of the AC current.
[0031] If the actual total number of samples is between the maximum total number of samples and the minimum total number of samples, the sampled data is considered normal.
[0032] In one exemplary embodiment, calculating the effective voltage value of the AC current based on the instantaneous voltage value at the sampling point and the actual total number of samples for one cycle of the AC current includes:
[0033] Calculate the average of the sum of squares of the instantaneous voltage values at all sampling points within one cycle of the alternating current;
[0034] The effective value of the alternating current voltage is obtained by taking the square root of the average value.
[0035] The step of calculating the frequency of the alternating current based on the sampling frequency and the actual total number of samples includes:
[0036] The frequency of the alternating current is obtained by dividing the sampling frequency by the total number of actual samples.
[0037] This application provides an elevator system, including:
[0038] Electrical equipment, and the power board described in any of the above embodiments.
[0039] This application provides a power board that integrates a main circuit module, a power module, and a logic control chip onto a single circuit board. The main circuit module provides a first DC voltage to the power module, which, under the control of the logic control chip, supplies power to the electrical equipment of the elevator system. Because the circuit board is smaller and lighter than a traditional transformer, and the logic control chip detects the input voltage and only allows the main circuit module to receive the required voltage, this power board not only supplies power to the various electrical devices of the elevator but is also small and lightweight. Furthermore, it can control the start-up of the power board, preventing power board failure accidents caused by inappropriate voltage input.
[0040] Other features and advantages of the embodiments of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the embodiments of this application. The objects and other advantages of the embodiments of this application may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description
[0041] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.
[0042] Figure 1 This is a schematic diagram of a power board according to an embodiment of this application;
[0043] Figure 2 This is a schematic diagram of the startup control method according to an embodiment of this application;
[0044] Figure 3 This is a schematic diagram of an elevator system according to an embodiment of this application;
[0045] Figure 4This is a circuit structure diagram of the main circuit module in an embodiment of this application. Detailed Implementation
[0046] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.
[0047] Figure 1 This is a schematic diagram of a power supply board according to an embodiment of this application. The power supply board is applied to an elevator system, such as... Figure 1 As shown, the power board 100 includes a main circuit module 10, a power module 20, and a logic control chip 30;
[0048] The main circuit module 10 is connected to the power grid, the power supply module 20 and the logic control chip 30 respectively, and is configured to connect to the AC power provided by the power grid. Under the control of the logic control chip 30, it performs AC-DC voltage conversion on the AC power and outputs the voltage after AC-DC voltage conversion.
[0049] The power module 20 is configured to perform DC-DC voltage conversion on the AC-DC voltage conversion under the control of the logic control chip 30, and output the DC-DC voltage conversion voltage to the electrical equipment of the elevator system.
[0050] The logic control chip 30 is configured to control the main circuit module 10 to perform AC-DC voltage conversion and to control the power supply module 20 to perform DC-DC voltage conversion.
[0051] This application provides a power board 100, which integrates a main circuit module 10, a power module 20, and a logic control chip 30 onto a single circuit board. The main circuit module 10 provides a first DC voltage to the power module 20, and the power module 20, under the control of the logic control chip 30, supplies power to the electrical equipment of the elevator system. Because the circuit board is smaller and lighter than a traditional transformer, the logic control chip 30 detects the input voltage and only performs AC-DC voltage conversion on the main circuit module 10 after it receives a suitable voltage, providing the converted voltage to the power module 20. Therefore, this power board 100 not only supplies power to the various electrical devices of the elevator but is also small and lightweight. Furthermore, it allows for start-up control of the power board 100, preventing accidents caused by inappropriate voltage input.
[0052] For example, the voltage provided by the power grid can be 220V AC voltage.
[0053] The main circuit module 10 can rectify the AC voltage input from the power grid into a first DC voltage through the rectifier circuit of this module.
[0054] For example, the first DC voltage can be 310V.
[0055] Digital signal processor chips are logic control chips, and the logic control chip in this application is a programmable chip.
[0056] In one exemplary embodiment, the main circuit module includes a first branch circuit, a second branch circuit, a rectifier circuit, and a bus capacitor; wherein, one end of the first branch circuit is connected to the phase line of the AC power supply, the other end of the first branch circuit is connected to the first input terminal of the rectifier circuit, and the second input terminal of the rectifier circuit is connected to the neutral line of the AC power supply; the two output terminals of the rectifier circuit are connected to the two ends of the bus capacitor; the first branch circuit and the second branch circuit are connected in parallel; the two ends of the bus capacitor are the output terminals of the main circuit module.
[0057] The logic control chip controls the main circuit module to perform AC-DC voltage conversion and controls the power supply module to perform DC voltage conversion, including:
[0058] If the AC power meets the mains power requirements and the phase of the AC power meets a preset phase, the first branch circuit is controlled to conduct to pre-charge the bus capacitor through the rectifier circuit; if the voltage on the bus capacitor is detected to be equal to a preset bus voltage, the second branch circuit is controlled to conduct to charge the bus capacitor through the rectifier circuit; after charging continues for a first preset time, the first branch circuit is controlled to disconnect; after waiting for a second preset time after the first branch circuit is disconnected, the power module is controlled to perform DC-DC voltage conversion.
[0059] The preset bus voltage is determined based on the effective value of the alternating current.
[0060] In one exemplary embodiment, the first branch circuit includes a first switching device and a current-limiting resistor connected in series;
[0061] The second branch circuit includes a second switching device;
[0062] The logic control chip controls the first branch circuit to conduct so as to precharge the bus capacitor through the rectifier circuit, including: controlling the first switching device to conduct the first branch circuit so as to precharge the bus capacitor through the current limiting resistor and the rectifier circuit;
[0063] The logic control chip controls the second branch circuit to conduct so as to charge the bus capacitor through the rectifier circuit, including: controlling the second switching device to conduct the second branch circuit so as to charge the bus capacitor through the rectifier circuit.
[0064] In one exemplary embodiment, the power module 20 includes at least one of the following: an external call power module, a control cabinet power module, a safety chain power module, and a brake power module; the electrical equipment of the elevator system correspondingly includes at least one of the following: safety switches and brake coils installed on the external call panel, control cabinet, and safety chain on each floor of the elevator system;
[0065] The outbound call power module can be configured to supply power to the outbound call board;
[0066] The control cabinet power module can be configured to supply power to the electrical equipment inside the control cabinet;
[0067] The safety chain power module can be configured to supply power to the safety switch series circuit on the safety chain;
[0068] The brake power module can be configured to supply power to the brake coil.
[0069] For example, the electrical equipment inside the control cabinet may include a main control chip and a driver chip.
[0070] In one exemplary embodiment, the external call power module, control cabinet power module, safety chain power module, and brake power module may include a DC-DC chip. The external call board typically requires 24V DC voltage, the electrical equipment inside the control cabinet typically requires 24V DC voltage, the safety chain switch series circuit typically requires 48V DC voltage, and the brake coil typically requires 110V DC voltage.
[0071] In one exemplary embodiment, the power board further includes a temperature acquisition module connected to the logic control chip 30;
[0072] The temperature acquisition module is configured to acquire the temperature of the power board 100 and send it to the logic control chip 30.
[0073] The logic control chip 30 is also configured to control the operation of a fan based on the received temperature; wherein the fan is used to cool the power board.
[0074] In one exemplary embodiment, the power board further includes:
[0075] A status indication module connected to the logic control chip 30;
[0076] The logic control chip 30 is also configured to collect and output the status signals of the power board 100;
[0077] The status indication module is configured to display the current status of the power board 100 based on the status signal output by the logic control chip 30.
[0078] For example, the current status of the power board 100 can be displayed using LEDs, as shown in Table 1.
[0079] Table 1 Power Board Status Correspondence Table
[0080]
[0081] Figure 2 This is a schematic diagram of a power-on control method according to an embodiment of this application. This power supply control method is applied to the logic control chip of the power board described above, such as... Figure 3 As shown, steps S21 to S22 are included:
[0082] S21, after power-on, detects whether the AC power supplied by the grid meets the mains power requirements;
[0083] S22, when the AC power meets the mains power requirements, control the main circuit module to perform AC-DC voltage conversion.
[0084] The power-on control method of this application embodiment detects whether the AC power supplied by the power grid meets the mains power requirements after power-on; if the AC power meets the mains power requirements, it controls the main circuit module to connect to the AC power supply, thereby detecting the voltage input from the power grid to the power board and avoiding power board failure accidents caused by connecting an unsuitable voltage.
[0085] The logic control chip can be powered by an auxiliary power supply module. After the AC input is powered on, the auxiliary power supply on the power board outputs the voltage required for the logic control chip to operate (e.g., +3.3V).
[0086] The mains power requirements are 220V±20% voltage and 50±10Hz frequency. The preset phase of the AC power can be 0° to 20°.
[0087] In one exemplary embodiment, controlling the main circuit module to perform AC-DC voltage conversion when the AC power meets preset requirements may include:
[0088] If the AC current meets the mains power requirements and the phase of the AC current meets a preset phase, the first branch circuit is controlled to conduct to pre-charge the bus capacitor through the rectifier circuit. If the bus voltage on the bus capacitor is detected to be equal to a preset bus voltage, the second branch circuit is controlled to conduct to charge the bus capacitor through the rectifier circuit. After charging continues for a first preset time, the first branch circuit is controlled to disconnect. The preset bus voltage is determined based on the effective value of the AC current.
[0089] The preset bus voltage can be the effective value of the AC voltage. For example, if the effective value of AC voltage is 220V, then the preset bus voltage is approximately 311V.
[0090] For example, the first preset time can be 200ms, or it can be set according to the actual situation.
[0091] In one exemplary embodiment, after the first branch circuit is disconnected, the following is further included:
[0092] After waiting for a second preset time, the power module is controlled to start DC voltage conversion.
[0093] The second preset time can be 50ms, or it can be set according to actual needs.
[0094] In one exemplary embodiment, it is determined whether the alternating current meets the mains power requirements as follows:
[0095] The alternating current signal is sampled according to a preset sampling frequency;
[0096] The sampling data is judged to be normal based on the preset sampling frequency, the maximum total number of samples in one cycle of the AC current, and the minimum total number of samples in one cycle of the AC current.
[0097] Under normal sampling conditions, the effective voltage value of the AC current is calculated based on the instantaneous voltage value of the sampling point and the actual total number of samples in one cycle of the AC current; the frequency of the AC current is calculated based on the preset sampling frequency and the actual total number of samples.
[0098] If the effective voltage and frequency of the alternating current meet the mains power standards, then the alternating current is deemed to meet the mains power requirements.
[0099] In one exemplary embodiment, the phase of the alternating current is determined to satisfy a preset phase as follows:
[0100] For sinusoidal alternating current, it can be assumed that the phase corresponding to the first sampling point where the voltage of the alternating current changes from negative to positive satisfies the preset phase.
[0101] In one exemplary embodiment, determining whether the sampling data is normal based on the preset sampling frequency, the maximum total number of samples in one cycle of the AC current, and the minimum total number of samples in one cycle of the AC current includes:
[0102] The actual total number of samples for one cycle of the AC current is calculated based on the preset sampling frequency and the cycle of the AC current.
[0103] If the actual total number of samples is between the maximum total number of samples and the minimum total number of samples, the sampled data is considered normal.
[0104] For example, assuming the mains frequency is between 40Hz and 60Hz, the mains period can be obtained by taking the reciprocal of the mains frequency. Then, the total number of samples can be obtained by multiplying the mains period by the preset sampling frequency. The maximum total number of samples can be calculated when the mains frequency is 40Hz, and the minimum total number of samples can be calculated when the mains frequency is 60Hz.
[0105] If the actual total number of samples is less than the minimum total number of samples or greater than the maximum total number of samples, the sampled data is considered abnormal.
[0106] In one exemplary embodiment, calculating the effective voltage value of the AC current based on the instantaneous voltage value at the sampling point and the actual total number of samples for one cycle of the AC current may include:
[0107] Calculate the average of the sum of squares of the instantaneous voltage values at all sampling points within one cycle of the alternating current;
[0108] The effective value of the alternating current voltage is obtained by taking the square root of the average value.
[0109] For example, the effective value of the voltage can be calculated using the following formula (1):
[0110]
[0111] Among them, V rms This represents the effective voltage value of a sinusoidal alternating current. It represents the square of the instantaneous voltage value at the Nth sampling point, where N represents the total number of samples within one cycle of the alternating current.
[0112] The step of calculating the frequency of the alternating current based on the sampling frequency and the actual total number of samples may include:
[0113] The frequency of the alternating current is obtained by dividing the sampling frequency by the total number of actual samples.
[0114] For example, the frequency of alternating current can be calculated using the following formula (2):
[0115]
[0116] Among them, f AC Indicates the frequency of alternating current; f sample This indicates the sampling frequency; number indicates the total number of samples taken within one cycle of the alternating current.
[0117] Figure 3 This is a schematic diagram of an elevator system according to an embodiment of this application, such as... Figure 3 As shown, the system includes a power board, elevator host, control cabinet, call panels for each floor, a safety chain switch series circuit, and a fan. The power board includes a DSP chip (corresponding to the logic control chip mentioned above), a brake power module, a call power module, a control cabinet power module, a safety chain power module, a temperature acquisition module, and an LED module (corresponding to the status indicator module mentioned above).
[0118] The power grid supplies power to the main circuit module of the power supply board, and the main circuit module supplies power to the brake power supply module, the external call power supply module, the control cabinet power supply module, and the safety chain power supply module. Figure 3 (Not shown in the diagram), the power supply board's brake power module supplies power to the elevator main unit (including the brake coil), the control cabinet power module supplies power to the control cabinet, the external call power module supplies power to the external call panels on each floor, and the safety chain power module supplies power to the safety switch series circuit. The DSP chip is connected to the brake power module, external call power module, control cabinet power module, safety chain power module, temperature acquisition module, LED module, and fan, respectively.
[0119] The ports of the DSP chip are shown in Table 2.
[0120] Table 2 DSP Chip Port Table
[0121]
[0122] Figure 3 The power board startup process is as follows:
[0123] When the power board is powered on, the DSP chip samples and calculates the effective value and frequency of the AC voltage at the input terminal of the main circuit module to determine whether the mains voltage meets the requirements of the mains power supply, thus avoiding the risk of the power board exploding due to the input of power supply exceeding the rated voltage.
[0124] The effective value of the input AC voltage and frequency can be calculated using the following method:
[0125] First, initialize the sampling frequency fsample and the maximum total number of samples for a sine wave cycle = nSampleMax and the minimum total number of samples = nSampleMin. If, after sampling one cycle, the total number of samples nSamples is not within the range of nSampleMax and nSampleMin, the data is considered abnormal, the recorded data is cleared, and the system waits to remeasure the next sine wave cycle.
[0126] Starting from the phase zero point of the sine wave, record the instantaneous voltage value Vsamples_n and the total number of samples nSamples for each sampling point in one sine wave cycle. Then, calculate the effective value of the AC voltage according to formula (1), and obtain the AC frequency through formula (2). If the effective value V rms and f AC If the set requirements are met, the input power supply is considered normal.
[0127] After detecting that the input AC power meets the requirements, control is needed. Figure 4 The timing sequence of the two relays is as follows: First, the pre-charge relay K2 is activated when the phase of the AC sinusoidal wave is between 0-20° (to prevent the AC voltage from burning out the pre-charge relay K2 at its peak). Because there is a current-limiting resistor RT1 on this line, the circuit is activated when power is first applied to prevent the bus capacitor from exploding due to excessive instantaneous current. To avoid current spikes during circuit switching that could burn out the main relay K1, the main relay K1 is activated only after the bus capacitor is fully charged, thus bypassing the circuit of the pre-charge relay K2.
[0128] Figure 4 The pre-charge relay K2 and resistor RT1 can be used as the first branch circuit, and the main relay K1 can be used as the second branch circuit. Figure 4 Relays K1 and K2 in the diagram can be single-pole double-throw relays. Here, 11 represents the moving contact, 12 represents the normally closed stationary contact, and 14 represents the normally open stationary contact. When the relay coil is energized, the moving contact closes with the normally open stationary contact and simultaneously opens with the normally closed stationary contact. A1 represents one terminal of the relay coil, connected to the positive terminal of the power supply or a control signal. When this terminal is energized, the moving contact of the relay switches states. A2 represents the other terminal of the relay coil, typically connected to the negative terminal of the power supply or ground. Applying control signals to A1 and A2 can cause the relay to engage or disengage, thereby achieving switching control of the load.
[0129] The interaction between the temperature control module and the DSP chip is as follows:
[0130] The NTC resistor for sampling the internal temperature of the chassis is located on the power board. Temperature changes inside the chassis will be reflected in changes in the NTC resistor value. The value is converted by the circuit and sent to the DSP chip for sampling. The temperature inside the chassis can be obtained by adding the conversion formula between the sampling voltage and resistance and the corresponding NTC datasheet.
[0131] When the Fan_drive signal on the power board is low, the fan coil is energized and rotates; conversely, when it is high, the fan coil is de-energized and stops.
[0132] The LED control module can be used as a power board status indicator, and the specific statuses are shown in Table 1.
[0133] The EERPOM storage module can be used to store data that you want to retain even when power is off during software operation.
[0134] The communication module is used to realize the communication information exchange between the DSP chip and the main control MCU.
[0135] This application also provides an elevator system, including:
[0136] Electrical equipment, and the power board described in any of the above embodiments.
[0137] This application describes several embodiments, but these descriptions are exemplary and not restrictive, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.
[0138] This application includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this application can also be combined with any conventional features or elements to form unique inventive solutions. Any feature or element of any embodiment can also be combined with features or elements from other inventive solutions to form another unique inventive solution. Therefore, it should be understood that any feature shown and / or discussed in this application can be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes can be made within the scope of the appended claims.
[0139] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that it does not depend on such a specific order. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims concerning the method and / or process should not be limited to the steps performed in the written order, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments of this application.
[0140] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term "computer storage medium" includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.
[0141] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of those features.
[0142] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.
[0143] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0144] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0145] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0146] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A power supply board for use in an elevator system, characterized in that, include: Logic control chip, main circuit module and power supply module; The main circuit module is connected to the power grid, the power supply module and the logic control chip respectively, and is configured to connect to the AC power provided by the power grid. Under the control of the logic control chip, the AC power is converted into AC-DC voltage and the converted voltage is output. The power module is configured to perform DC-DC voltage conversion on the AC-DC voltage conversion result under the control of the logic control chip and output the DC-DC voltage conversion result to the electrical equipment of the elevator system. The logic control chip is configured to control the main circuit module to perform AC-DC voltage conversion and to control the power supply module to perform DC-DC voltage conversion.
2. The power board as described in claim 1, characterized in that, The main circuit module includes a first branch circuit, a second branch circuit, a rectifier circuit, and a bus capacitor. One end of the first branch circuit is connected to the phase line of the AC power supply, and the other end of the first branch circuit is connected to the first input terminal of the rectifier circuit. The second input terminal of the rectifier circuit is connected to the neutral line of the AC power supply. The two output terminals of the rectifier circuit are respectively connected to the two ends of the bus capacitor. The first branch circuit and the second branch circuit are connected in parallel. The two ends of the bus capacitor serve as the two output terminals of the main circuit module. The logic control chip controls the main circuit module to connect to the AC power and controls the power supply module to perform DC voltage conversion, including: If the AC power meets the mains power requirements and the phase of the AC power meets a preset phase, the first branch circuit is controlled to conduct to pre-charge the bus capacitor through the rectifier circuit; if the voltage on the bus capacitor is detected to be equal to the preset bus voltage, the second branch circuit is controlled to conduct to charge the bus capacitor through the rectifier circuit; after charging continues for a first preset time, the first branch circuit is controlled to disconnect; after the first branch circuit is disconnected and a second preset time is waited, the power module is controlled to perform DC-DC voltage conversion. The preset bus voltage is determined based on the effective value of the alternating current.
3. The power board as described in claim 2, characterized in that, The first branch circuit includes a first switching device and a current-limiting resistor connected in series; The second branch circuit includes a second switching device; The logic control chip controls the first branch circuit to conduct so as to precharge the bus capacitor through the rectifier circuit, including: controlling the first switching device to conduct the first branch circuit so as to precharge the bus capacitor through the current limiting resistor and the rectifier circuit; The logic control chip controls the second branch circuit to conduct so as to charge the bus capacitor through the rectifier circuit, including: controlling the second switching device to conduct the second branch circuit so as to charge the bus capacitor through the rectifier circuit.
4. A start-up control method, characterized in that, The logic control chip used in the power board according to any one of claims 1 to 3 includes: After powering on, check whether the AC power supplied by the grid meets the mains power requirements; When the AC power meets the mains power requirements, the main circuit module is controlled to perform AC-DC voltage conversion.
5. The start-up control method as described in claim 4, characterized in that, When the AC power meets the mains power requirements, controlling the main circuit module to connect to the AC power includes: If the AC current meets the mains power requirements and the phase of the AC current meets a preset phase, the first branch circuit is controlled to conduct to pre-charge the bus capacitor through the rectifier circuit. If the bus voltage on the bus capacitor is detected to be equal to a preset bus voltage, the second branch circuit is controlled to conduct to charge the bus capacitor through the rectifier circuit. After charging continues for a first preset time, the first branch circuit is controlled to disconnect. The preset bus voltage is determined based on the effective value of the AC current.
6. The start-up control method as described in claim 5, characterized in that, After the first branch circuit is disconnected, the following is also included: After waiting for a second preset time, the power module is controlled to start DC-DC voltage conversion.
7. The start-up control method as described in claim 5, characterized in that, The detection of whether the AC power supplied by the power grid meets the mains power requirements includes: The alternating current signal is sampled according to a preset sampling frequency; The sampling data is judged to be normal based on the preset sampling frequency, the maximum total number of samples in one cycle of the AC current, and the minimum total number of samples in one cycle of the AC current. Under normal sampling conditions, the effective voltage value of the AC current is calculated based on the instantaneous voltage value of the sampling point and the actual total number of samples in one cycle of the AC current; the frequency of the AC current is calculated based on the preset sampling frequency and the actual total number of samples. If the effective voltage and frequency of the alternating current meet the mains power standards, then the alternating current is deemed to meet the mains power requirements.
8. The start-up control method as described in claim 7, characterized in that, The step of determining whether the sampling data is normal based on the preset sampling frequency, the maximum total number of samples in one cycle of the AC current, and the minimum total number of samples in one cycle of the AC current includes: The actual total number of samples for one cycle of the AC current is calculated based on the preset sampling frequency and the cycle of the AC current. If the actual total number of samples is between the maximum total number of samples and the minimum total number of samples, the sampled data is considered normal.
9. The start-up control method as described in claim 7, characterized in that, The calculation of the effective voltage value of the AC current based on the instantaneous voltage value at the sampling point and the actual total number of samples in one cycle of the AC current includes: Calculate the average of the sum of squares of the instantaneous voltage values at all sampling points within one cycle of the alternating current; The effective value of the alternating current voltage is obtained by taking the square root of the average value. The step of calculating the frequency of the alternating current based on the sampling frequency and the actual total number of samples includes: The frequency of the alternating current is obtained by dividing the sampling frequency by the total number of actual samples.
10. An elevator system, characterized in that, include: Electrical equipment, and the power board according to any one of claims 1 to 3.