A voltage detection circuit, a power supply device, and an elevator

Abstract

This invention discloses a voltage detection circuit, a power supply device, and an elevator. The voltage detection circuit includes a parallel-to-serial converter module, a microprocessor module, and several isolated voltage acquisition modules. A first isolated voltage acquisition module is connected to a first voltage to be measured, and the first isolated voltage acquisition module is connected to the microprocessor module through the parallel-to-serial converter module. The first isolated voltage acquisition module includes a first optocoupler and a second optocoupler. The input terminals of both the first and second optocouplers are connected to the first voltage to be measured, and the output terminals of both the first and second optocouplers are connected to the parallel-to-serial converter module. This application simultaneously acquires multiple signals through the parallel-to-serial converter module, which helps to alleviate signal interference and improve detection efficiency. This invention can be widely applied in the field of power supply detection technology.

Description

Technical Field

[0001] This utility model relates to the field of power supply detection technology, and in particular to a voltage detection circuit, a power supply device, and an elevator. Background Technology

[0002] In traditional quality inspection of elevator power supply products, it is often necessary to check whether the target voltages output by the product meet the standards. Related technologies typically use differential operational proportional circuits to proportionally reduce the target voltage, and then send the reduced sampling signal to the analog input pin of a microcontroller to determine whether there are overvoltage or undervoltage conditions, thereby identifying whether the product's performance quality meets the standards. However, this approach is prone to mutual interference from multiple sampling signals, leading to misjudgments. Furthermore, the sampling efficiency is relatively low. Utility Model Content

[0003] The purpose of this utility model is to at least partially solve one of the technical problems existing in the related technologies.

[0004] Therefore, one objective of this utility model is to provide a high-efficiency voltage detection circuit, comprising: a parallel-to-serial converter module, a microprocessor module, and several isolated voltage acquisition modules; a first isolated voltage acquisition module is connected to a first voltage to be measured, and the first isolated voltage acquisition module is connected to the microprocessor module through the parallel-to-serial converter module; the first isolated voltage acquisition module includes a first optocoupler and a second optocoupler, the input terminals of the first optocoupler and the second optocoupler are both connected to the first voltage to be measured, and the output terminals of the first optocoupler and the second optocoupler are both connected to the parallel-to-serial converter module. This application simultaneously acquires multiple signals through the parallel-to-serial converter module, which helps to alleviate signal interference and improve detection efficiency.

[0005] In addition, the voltage detection circuit according to the above embodiments of the present invention may also have the following additional technical features:

[0006] Furthermore, in one embodiment of this utility model, the first isolation voltage acquisition module further includes: a first adjustable voltage regulator, a first resistor, and a second resistor; the positive terminal of the first voltage to be measured is connected to the first end of the first resistor, and the second end of the first resistor is connected to the negative terminal of the first voltage to be measured through the second resistor; the first end of the first resistor is connected to the anode of the first optocoupler, the cathode of the first optocoupler is connected to the cathode of the first adjustable voltage regulator, the anode of the first adjustable voltage regulator is connected to the negative terminal of the first voltage to be measured, the reference terminal of the first adjustable voltage regulator is connected to the second end of the first resistor, the collector of the first optocoupler is connected to the first power supply through the third resistor, and the emitter of the first optocoupler is connected to the parallel-to-serial conversion module.

[0007] Furthermore, in one embodiment of this utility model, the first isolation voltage acquisition module further includes: a second adjustable voltage regulator, a fourth resistor, a fifth resistor, and a sixth resistor; the positive terminal of the first voltage to be measured is connected to the first terminal of the fourth resistor, and the second terminal of the fourth resistor is connected to the negative terminal of the first voltage to be measured through the fifth resistor; the first terminal of the first resistor is connected to the anode of the second optocoupler, the cathode of the second optocoupler is connected to the cathode of the second adjustable voltage regulator, the anode of the second adjustable voltage regulator is connected to the negative terminal of the first voltage to be measured, the reference terminal of the second adjustable voltage regulator is connected to the second terminal of the fourth resistor, the collector of the second optocoupler is connected to the emitter of the second optocoupler through the sixth resistor, the emitter of the second optocoupler is grounded, and the collector of the second optocoupler is connected to the parallel-to-serial conversion module.

[0008] Furthermore, in one embodiment of this utility model, the first ratio of the first resistor to the second resistor is less than the second ratio of the fourth resistor to the fifth resistor.

[0009] Furthermore, in one embodiment of this utility model, the quotient of the sum of the first ratio plus 1 and the sum of the second ratio plus 1 is equal to the quotient of the first voltage and the second voltage; wherein, the first voltage is the lower limit of the first voltage to be measured, and the second voltage is the upper limit of the first voltage to be measured.

[0010] Furthermore, in one embodiment of this utility model, the parallel-to-serial conversion module includes a 74HC165 chip, and the first data input port of the 74HC165 chip is connected to the output terminal of the first isolation voltage acquisition module.

[0011] Furthermore, in one embodiment of this utility model, the clock signal port of the microprocessor module is connected to the CP port of the 74HC165 chip, and the chip select signal port of the microprocessor module is connected to the PL port of the 74HC165 chip.

[0012] The serial data input port of the microprocessor module is connected to the serial data output port of the 74HC165 chip.

[0013] Furthermore, in one embodiment of the present invention, the detection circuit further includes: a second isolation voltage acquisition module, wherein the second data input port of the 74HC165 chip is connected to the output terminal of the second isolation voltage acquisition module.

[0014] On the other hand, this utility model provides a power supply device including the voltage detection circuit described above.

[0015] On the other hand, the present invention provides an elevator that includes the voltage detection circuit described above, or includes the power supply device described above.

[0016] The advantages and beneficial effects of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention:

[0017] This application discloses a voltage detection circuit, power supply device, and elevator, comprising: a parallel-to-serial converter module, a microprocessor module, and several isolated voltage acquisition modules; a first isolated voltage acquisition module is connected to a first voltage to be measured, and the first isolated voltage acquisition module is connected to the microprocessor module through the parallel-to-serial converter module; the first isolated voltage acquisition module includes a first optocoupler and a second optocoupler, the input terminals of both the first and second optocouplers are connected to the first voltage to be measured, and the output terminals of both the first and second optocouplers are connected to the parallel-to-serial converter module. This application simultaneously acquires multiple signals through the parallel-to-serial converter module, which helps to alleviate signal interference and improve detection efficiency. Attached Figure Description

[0018] Figure 1 A schematic diagram of one embodiment of the voltage detection circuit provided in this application;

[0019] Figure 2 A circuit schematic diagram of one embodiment of the voltage detection circuit provided in this application. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "length," "upper," "lower," "front," "rear," "left," "right," "top," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] First, the terms used in this application will be explained:

[0024] Isolation: refers to the absence of a direct electrical connection in a circuit. For example, two or more power supplies are independent networks with their own independent reference grounds, and there is no direct electrical connection between the reference grounds.

[0025] Parallel data: Data that exists simultaneously in parallel, multiple bits of data transmitted at the same time through multiple lines, without any order;

[0026] Serial data refers to data transmitted bit by bit through a single line, and has a sequential order.

[0027] In the traditional quality inspection of elevator power supply products, it is often necessary to check whether the target voltage of the product output meets the standard. In the existing technology, a differential operational proportional circuit is generally used to reduce the target voltage proportionally, and then the reduced sampling signal is sent to the analog input pin of the microcontroller to determine whether the target voltage is over-voltage or under-voltage, so as to identify whether the product performance quality meets the standard.

[0028] When testing whether the target voltage of power supply products meets the standard, the differential operational proportional circuit cannot achieve true isolation. When the product has multiple independent and isolated output voltages, this method is prone to interference, which may lead to misjudgment.

[0029] When it is necessary to test whether the output voltage of multiple products or multiple outputs meets the standard at the same time, the existing detection methods are often inefficient because each target voltage needs to be tested, which usually requires the use of one analog input pin of the MCU. However, the analog input pin resources of the MCU are limited, so the detection efficiency is not high.

[0030] Therefore, this application proposes a voltage detection circuit, referring to... Figure 1 The schematic diagram of the voltage detection circuit shown provides a detailed description of the voltage detection circuit proposed in this application.

[0031] The voltage detection circuit proposed in this application includes: a parallel-to-serial conversion module, a microprocessor module, and several isolated voltage acquisition modules;

[0032] The first isolation voltage acquisition module is connected to the first voltage to be measured, and the first isolation voltage acquisition module is connected to the microprocessor module through the parallel-to-serial module.

[0033] The first isolation voltage acquisition module includes a first optocoupler and a second optocoupler. The input terminals of the first optocoupler and the second optocoupler are both connected to the first voltage to be measured, and the output terminals of the first optocoupler and the second optocoupler are both connected to the parallel-to-serial converter module.

[0034] In some possible implementations, this application includes multiple isolated voltage acquisition modules. The microprocessor module can simultaneously receive voltage signals acquired by multiple isolated voltage acquisition modules. These modules are isolated from each other, which helps reduce interference between signals. Of course, Figure 1 The diagram shows the first isolation voltage acquisition module and the second isolation voltage acquisition module, but does not limit the specific number of isolation voltage acquisition modules in the voltage detection circuit.

[0035] Furthermore, in one embodiment of this utility model, the first isolation voltage acquisition module further includes: a first adjustable voltage regulator, a first resistor, and a second resistor; the positive terminal of the first voltage to be measured is connected to the first end of the first resistor, and the second end of the first resistor is connected to the negative terminal of the first voltage to be measured through the second resistor; the first end of the first resistor is connected to the anode of the first optocoupler, the cathode of the first optocoupler is connected to the cathode of the first adjustable voltage regulator, the anode of the first adjustable voltage regulator is connected to the negative terminal of the first voltage to be measured, the reference terminal of the first adjustable voltage regulator is connected to the second end of the first resistor, the collector of the first optocoupler is connected to the first power supply through the third resistor, and the emitter of the first optocoupler is connected to the parallel-to-serial conversion module.

[0036] Furthermore, in one embodiment of this utility model, the first isolation voltage acquisition module further includes: a second adjustable voltage regulator, a fourth resistor, a fifth resistor, and a sixth resistor; the positive terminal of the first voltage to be measured is connected to the first terminal of the fourth resistor, and the second terminal of the fourth resistor is connected to the negative terminal of the first voltage to be measured through the fifth resistor; the first terminal of the first resistor is connected to the anode of the second optocoupler, the cathode of the second optocoupler is connected to the cathode of the second adjustable voltage regulator, the anode of the second adjustable voltage regulator is connected to the negative terminal of the first voltage to be measured, the reference terminal of the second adjustable voltage regulator is connected to the second terminal of the fourth resistor, the collector of the second optocoupler is connected to the emitter of the second optocoupler through the sixth resistor, the emitter of the second optocoupler is grounded, and the collector of the second optocoupler is connected to the parallel-to-serial conversion module.

[0037] Furthermore, in one embodiment of this utility model, the first ratio of the first resistor to the second resistor is less than the second ratio of the fourth resistor to the fifth resistor.

[0038] Furthermore, in one embodiment of this utility model, the quotient of the sum of the first ratio plus 1 and the sum of the second ratio plus 1 is equal to the quotient of the first voltage and the second voltage; wherein, the first voltage is the lower limit of the first voltage to be measured, and the second voltage is the upper limit of the first voltage to be measured.

[0039] Furthermore, in one embodiment of this utility model, the parallel-to-serial conversion module includes a 74HC165 chip, and the first data input port of the 74HC165 chip is connected to the output terminal of the first isolation voltage acquisition module.

[0040] The output of the first isolation voltage acquisition module is the collector of the second optocoupler or the emitter of the first optocoupler.

[0041] Furthermore, in one embodiment of this utility model, the clock signal port of the microprocessor module is connected to the CP port of the 74HC165 chip, and the chip select signal port of the microprocessor module is connected to the PL port of the 74HC165 chip.

[0042] The serial data input port of the microprocessor module is connected to the serial data output port of the 74HC165 chip.

[0043] Furthermore, in one embodiment of the present invention, the detection circuit further includes: a second isolation voltage acquisition module, wherein the second data input port of the 74HC165 chip is connected to the output terminal of the second isolation voltage acquisition module.

[0044] The voltage detection circuit provided in this application will be described in detail below with a specific embodiment:

[0045] To address the aforementioned shortcomings, a novel isolated parallel-to-serial voltage detection circuit is provided.

[0046] As attached Figure 2 As shown, the isolated parallel-to-serial voltage detection circuit includes an optocoupler isolated voltage detection circuit / isolation voltage acquisition module (1) and (2), a parallel-to-serial circuit / parallel-to-serial module (3), and an MCU circuit / microprocessor module (4).

[0047] The optocoupler isolation voltage detection circuit (1) consists of two optocouplers U2 / first optocoupler and U3 / second optocoupler, two adjustable precision voltage regulators D1 and D2, and eight surface mount resistors R1 (third resistor), R2, R3 (first resistor), R4 (second resistor), R5, R6 (sixth resistor), R7 (fourth resistor), and R8 (fifth resistor). The positive terminal V1+ of the voltage to be measured / first voltage under test V1 is connected to pin r of D1 through R3. Pin r of D1 is also connected to R4. The anode a terminal of D1 and the other end of R4 are connected to the negative terminal V1- of the voltage to be measured V1. The positive terminal V1+ of V1 is connected to pin 1 of optocoupler U2 via resistor R2, and pin 2 of U2 is connected to the cathode of D1. The positive terminal V1+ of the voltage being measured is connected to pin r of D2 via resistor R7, and pin r of D2 is also connected to resistor R8. The anode pin a of D2 and the other end of resistor R8 are connected to the negative terminal V1- of the voltage being measured. The positive terminal V1+ of V1 is connected to pin 1 of optocoupler U3 via resistor R5, and pin 2 of U3 is connected to the cathode of D1. The +3.3V power supply (first power supply) is connected to pin 4 of U2 via resistor R1, pin 3 of U2 is connected to pin 4 of U3, pin 3 of U3 is connected to digital ground DGND, and resistor R6 is connected in parallel between pins 3 and 4 of U3. When the measured voltage V1 is higher than the set lower limit (i.e., the first voltage) and lower than the set upper limit (i.e., the second voltage), the voltage at pin r of D1 is higher than 2.5V, the voltage at pin r of D2 is lower than 2.5V, optocoupler U2 is turned on, and optocoupler U3 is not turned on. At this time, pin 3 of U2 outputs a high level. When the measured voltage V1 is lower than the set lower limit, the voltages at pin r of both D1 and D2 are lower than 2.5V, and optocouplers U2 and U3 are not turned on. At this time, pin 3 of U2 outputs a high level. Low level; when the measured voltage V1 is higher than the set upper limit, the voltage at pin r of D1 and D2 is higher than 2.5V, and optocouplers U2 and U3 are both turned on. At this time, pin 3 of U2 also outputs a low level. In summary, when the measured voltage V1 is between the set lower limit and upper limit, pin 3 of U2 outputs a high level Data_1. When the measured voltage V1 is lower than the lower limit or higher than the upper limit, pin 3 of U2 outputs a low level Data_1.

[0048] The optocoupler isolation voltage detection circuit (2) consists of two optocouplers U5 and U6, two adjustable precision voltage regulators D3 and D4, and eight surface mount resistors R9, R10, R11, R12, R13, R14, R15, and R16. Its circuit structure and working principle are exactly the same as those of the optocoupler isolation voltage detection circuit (1).

[0049] The parallel-to-serial converter circuit (3) consists of a parallel-to-serial converter chip U4, model number 74HC165. Pins 16 and 8 of U4 are connected to the positive power supply (+3.3V) and digital ground (DGND) respectively to ensure normal power supply to the chip. D0 to D7 are the parallel data input interfaces of U4, which are connected to the output terminals of the multi-channel voltage detection circuit. Figure 2 Only the output terminals Data_1 and Data_2 of the optocoupler isolated voltage detection circuits (1) and (2) are shown. Data_1 and Data_2 are connected to D0 and D1, respectively. Data_3 to Data_8 are the output terminals of other voltage detection circuits under test, which are connected to D2 to D7, respectively.

[0050] The MCU circuit (4) consists of U1. The clock signal interface SPI_CLK of U1 is connected to the CP pin of U4 to provide a synchronous clock signal for chip U4; the chip select signal interface SPI_NSS of U1 is connected to the PL pin of U4. Its function is as follows: when the PL pin is low, the data of D0 to D7 will be loaded into the register inside U4; when the PL pin is high, under the action of the clock signal SPI_CLK, U4 will convert the parallel data into serial data according to the pin order of D7 to D0 and output it to the Q7 pin. The serial data input interface SPI_MOSI of U1 is connected to the serial data output pin Q7 of U4 to read the parallel-to-serial measured voltage data acquired by U4, and then determine whether there is any abnormality in the multi-channel measured voltage.

[0051] In another embodiment, attachment Figure 2 This is a preferred embodiment of an isolated parallel-to-serial voltage detection circuit of the present invention. In the optocoupler isolated voltage detection circuit (1), the two optocouplers U2 and U3 are TLP785, the two adjustable precision voltage regulators D1 and D2 are TL431, and R1, R2, R3, R4, R5, R6, R7, and R8 are eight surface mount resistors. R1 is a current-limiting resistor, which limits the secondary current of U2; R2 is also a current-limiting resistor, which limits the primary current of U2; R5 is also a current-limiting resistor, which limits the primary current of U3; resistor R6 is a pull-down resistor, which pulls Data_1 down to a low level in the default state. The resistance values ​​of R3 and R4 are set so that when the measured voltage V1 is at the lower voltage limit, the voltage division value on R4 is exactly equal to 2.5V; the resistance values ​​of R7 and R8 are set so that when the measured voltage V1 is at the upper voltage limit, the voltage division value on R8 is exactly equal to 2.5V.

[0052] Specifically, in one embodiment, the first ratio of the first resistor to the second resistor is less than the second ratio of the fourth resistor to the fifth resistor, i.e., it satisfies the following formula:

[0053]

[0054] In another embodiment, the quotient of the sum of the first ratio plus 1 and the sum of the second ratio plus 1 is equal to the quotient of the first voltage U1 and the second voltage U2, that is, it satisfies the following formula:

[0055]

[0056] Thus, when the measured voltage is within the range between the lower and upper limits, D1 is on and D2 is off. Therefore, the primary side of optocoupler U2 is on and the primary side of optocoupler U3 is off. At this time, pin 3 of U2 outputs a high level, i.e., Data_1 is high, indicating that the measured voltage V1 is normal. When the measured voltage V1 is below the lower limit or above the upper limit, both D1 and D2 are off or both are on. Therefore, the primary sides of optocouplers U2 and U3 are either not on or both are on. At this time, pin 3 of U2 outputs a low level, i.e., Data_1 is low, indicating that the measured voltage V1 is abnormal. In summary, when Data_1 is high, the measured voltage V1 is normal; when Data_1 is low, the measured voltage V1 is abnormal.

[0057] The circuit structure and working principle of the optocoupler isolation voltage detection circuit (2) are completely consistent with those of the optocoupler isolation voltage detection circuit (1). Similarly, when Data_2 is high, it means that the measured voltage V2 is normal, and when Data_2 is low, it means that the measured voltage V2 is abnormal.

[0058] The parallel-to-serial conversion circuit (3) consists of a parallel-to-serial conversion chip U4, model number 74HC165. D0 to D7 are the parallel data input interfaces of U4, which can simultaneously acquire a total of 8 sets of voltage detection input data from Data_1 to Data_8, and convert them into serial data to be output to the MCU from port Q7.

[0059] In the MCU circuit (4), U1's SPI_CLK is a clock pin connected to U4's CP pin. Its function is to control the data shift of U4 and convert parallel data into serial data. SPI_NSS is a chip select signal connected to U4's PL pin. When the PL pin is low, the data of D0 to D7 will be loaded into the register inside U4. When the PL pin is high, under the action of the clock signal SPI_CLK, U4 will convert the parallel data into serial data in sequence and output it to the Q7 pin. U1's serial data input interface SPI_MOSI can then obtain the serial data of Q7 in U4 and determine whether the measured voltage is normal. In the corresponding 8-bit serial data, a high level indicates that the corresponding measured voltage is normal, and a low level indicates that the corresponding measured voltage is abnormal.

[0060] This invention achieves fully isolated detection of multiple non-common-ground power supplies. Furthermore, the parallel-to-serial data processing method significantly saves microcontroller resources and improves detection efficiency. The isolated voltage detection method solves the interference problem caused by the false isolation of traditional differential operational amplifiers, effectively reducing the false detection rate.

[0061] This invention achieves isolated voltage detection, which has strong anti-interference ability and effectively reduces the detection error rate.

[0062] This invention's parallel-to-serial data processing method saves microcontroller resources and improves detection efficiency.

[0063] It should be noted that the embodiments of this application do not involve any software improvements, and the software aspects can be easily derived from existing technologies.

[0064] On the other hand, this utility model provides a power supply device including the voltage detection circuit described above.

[0065] On the other hand, the present invention provides an elevator that includes the voltage detection circuit described above, or includes the power supply device described above.

[0066] In the description of this specification, references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. 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.

[0067] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A voltage detection circuit, characterized in that, include: Parallel-to-serial conversion module, microprocessor module, and several isolated voltage acquisition modules; The first isolation voltage acquisition module is connected to the first voltage to be measured, and the first isolation voltage acquisition module is connected to the microprocessor module through the parallel-to-serial module. The first isolation voltage acquisition module includes a first optocoupler and a second optocoupler. The input terminals of the first optocoupler and the second optocoupler are both connected to the first voltage to be measured, and the output terminals of the first optocoupler and the second optocoupler are both connected to the parallel-to-serial converter module.

2. The voltage detection circuit according to claim 1, characterized in that, The first isolation voltage acquisition module further includes: a first adjustable voltage regulator, a first resistor, and a second resistor; the positive terminal of the first voltage to be measured is connected to the first end of the first resistor, and the second end of the first resistor is connected to the negative terminal of the first voltage to be measured through the second resistor; the first end of the first resistor is connected to the anode of the first optocoupler, the cathode of the first optocoupler is connected to the cathode of the first adjustable voltage regulator, the anode of the first adjustable voltage regulator is connected to the negative terminal of the first voltage to be measured, the reference terminal of the first adjustable voltage regulator is connected to the second end of the first resistor, the collector of the first optocoupler is connected to the first power supply through the third resistor, and the emitter of the first optocoupler is connected to the parallel-to-serial conversion module.

3. A voltage detection circuit according to claim 2, characterized in that, The first isolation voltage acquisition module further includes: a second adjustable voltage regulator, a fourth resistor, a fifth resistor, and a sixth resistor; the positive terminal of the first voltage to be measured is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the negative terminal of the first voltage to be measured through the fifth resistor; the first end of the first resistor is connected to the anode of the second optocoupler, the cathode of the second optocoupler is connected to the cathode of the second adjustable voltage regulator, the anode of the second adjustable voltage regulator is connected to the negative terminal of the first voltage to be measured, the reference terminal of the second adjustable voltage regulator is connected to the second end of the fourth resistor, the collector of the second optocoupler is connected to the emitter of the second optocoupler through the sixth resistor, the emitter of the second optocoupler is grounded, and the collector of the second optocoupler is connected to the parallel-to-serial converter module.

4. A voltage detection circuit according to claim 3, characterized in that, The first ratio of the first resistor to the second resistor is less than the second ratio of the fourth resistor to the fifth resistor.

5. A voltage detection circuit according to claim 4, characterized in that, The quotient of the sum of the first ratio plus 1 and the sum of the second ratio plus 1 is equal to the quotient of the first voltage and the second voltage; wherein, the first voltage is the lower limit of the first voltage to be measured, and the second voltage is the upper limit of the first voltage to be measured.

6. A voltage detection circuit according to claim 1, characterized in that, The parallel-to-serial conversion module includes a 74HC165 chip, and the first data input port of the 74HC165 chip is connected to the output of the first isolation voltage acquisition module.

7. A voltage detection circuit according to claim 6, characterized in that, The clock signal port of the microprocessor module is connected to the CP port of the 74HC165 chip, and the chip select signal port of the microprocessor module is connected to the PL port of the 74HC165 chip. The serial data input port of the microprocessor module is connected to the serial data output port of the 74HC165 chip.

8. A voltage detection circuit according to claim 6, characterized in that, The detection circuit further includes a second isolation voltage acquisition module, wherein the second data input port of the 74HC165 chip is connected to the output terminal of the second isolation voltage acquisition module.

9. A power supply device, characterized in that, The power supply device includes a voltage detection circuit as described in any one of claims 1 to 8.

10. An elevator, characterized in that, The elevator includes a voltage detection circuit as described in any one of claims 1 to 8, or the elevator includes a power supply device as described in claim 9.

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