Isolation device and system

Abstract

The invention relates to the technical field of signal isolation transmission, and particularly provides an isolation device and system. The isolation device comprises a transmitting device, an isolation device and a receiving device, the transmitting device is configured to transmit pulse signals of corresponding types to the isolation device based on different input signals under the condition that the power supply voltage is higher than or equal to the working threshold voltage; under the condition that the power supply voltage is lower than the working threshold voltage, a pulse signal of a corresponding type is sent to the isolation device according to a default output signal; the receiving device is configured to output a corresponding output signal according to the type of the received pulse signal. The isolation device can quickly send the pulse signal of the type corresponding to the default output signal to the isolation device based on the transmitting device when the power supply of the transmitting device is under-voltage, so that the receiving device outputs the default output signal according to the type of the received pulse signal, thereby improving the accuracy of the output signal, reducing the fault probability of the system, and improving the reliability of the system. And rapid under-voltage protection is realized.

Description

Technical Field

[0001] This application relates to the technical field of signal isolation transmission. Specifically, it relates to an isolation device and system. Background Art

[0002] Compared with traditional optocoupler isolation devices, digital isolators have the advantages of high transmission signal rate, precise timing, low power consumption, small size, and high reliability, and are also more and more widely used in the field of isolation transmission. When a digital isolator transmits a signal, it needs to modulate and demodulate the input signal so that the signal can pass through the isolation barrier.

[0003] Currently, the main modulation technology is the edge pulse modulation technology. The edge modulation technology is achieved by encoding the rising edge and falling edge of the input signal with different pulses respectively, and then restoring the edge of the input signal at the receiving end according to information such as the polarity and quantity of the pulses. However, the undervoltage protection judgment time of the existing edge modulation technology is relatively long, and the receiver has to wait for a long time to obtain the undervoltage information on the transmitting side. The output signal during this waiting time may be incorrect, resulting in system failures. Summary of the Invention

[0004] In view of this, the purpose of the embodiments of this application is to provide an isolation device and system to solve the above technical problems.

[0005] In a first aspect, an embodiment of this application provides an isolation device, which includes: a transmitting device, an isolation device, and a receiving device;

[0006] The isolation device is electrically connected to the transmitting device and the receiving device respectively;

[0007] The transmitting device is configured to, when the supply voltage is higher than or equal to the working threshold voltage, send a corresponding type of pulse signal to the isolation device based on the difference of the input signal; when the supply voltage is lower than the working threshold voltage, send a corresponding type of pulse signal to the isolation device according to the default output signal;

[0008] The isolation device is configured to send the received pulse signal to the receiving device;

[0009] The receiving device is configured to output a corresponding output signal according to the type of the received pulse signal.

[0010] In the above implementation process, the isolation device includes a transmitting device, an isolation device, and a receiving device; the isolation device is electrically connected to the transmitting device and the receiving device respectively; the transmitting device is configured to, when the supply voltage is higher than or equal to the working threshold voltage, send a pulse signal of a corresponding type to the isolation device based on different input signals; when the supply voltage is lower than the working threshold voltage, send a pulse signal of a corresponding type to the isolation device according to the default output signal; the isolation device is configured to send the received pulse signal to the receiving device; the receiving device is configured to output a corresponding output signal according to the type of the received pulse signal. By sending a pulse signal of a corresponding type to the isolation device according to the default output signal when the supply voltage is lower than the working threshold voltage, the receiving device can receive a pulse signal of a type corresponding to the default output signal and output the default output signal. When the power supply of the transmitting device is under-voltage, a pulse signal of a type corresponding to the default output signal can be quickly sent to the isolation device based on the transmitting device, so that the receiving device outputs the default output signal according to the type of the received pulse signal, improving the accuracy of the output signal, reducing the system failure probability, and achieving fast under-voltage protection.

[0011] Optionally, in the embodiment of the present application, the input signal includes a high level and a low level; the transmitting device is specifically configured to, when the supply voltage is higher than or equal to the working threshold voltage, if the input signal is a high level, send a first type of pulse signal to the isolation device; if the input signal is a low level, send a second type of pulse signal to the isolation device; when the supply voltage is lower than the working threshold voltage, if the default output signal is a high level, send the first type of pulse signal to the isolation device; if the default output signal is a low level, send the second type of pulse signal to the isolation device; the receiving device is specifically configured to output a high level when receiving the first type of pulse signal; and output a low level when receiving the second type of pulse signal.

[0012] In the above implementation process, the transmitting device converts the two different input signals of a high level and a low level into two different types of pulse signals. When the supply voltage is lower than the working threshold voltage, according to the default output signal, when the default output signal is a high level, a first type of pulse signal is sent to the isolation device; when the default output signal is a low level, a second type of pulse signal is sent to the isolation device; and the pulse signal corresponding to the default output signal is sent to the receiving device through the isolation device, so that the receiving device can output a level signal consistent with the default output signal, improving the accuracy of the output signal and reducing the system failure probability.

[0013] Optionally, in the embodiments of the present application, the transmitting device includes: a voltage detection unit, an encoder, and a pulse generator; the voltage detection unit is configured to detect the magnitude relationship between the supply voltage and the operating threshold voltage; and when the supply voltage is higher than or equal to the operating threshold voltage, send a first control signal to the encoder; when the supply voltage is lower than the operating threshold voltage, send a second control signal to the pulse generator; the encoder is configured to, when receiving the first control signal, send pulse signals of corresponding types to the isolation device based on different input signals; the pulse generator is configured to, when receiving the second control signal, send pulse signals of corresponding types to the isolation device according to the default output signal.

[0014] In the above implementation process, the voltage detection unit can detect the magnitude relationship between the supply voltage and the operating threshold voltage to determine whether power supply undervoltage occurs according to the detection result of the voltage detection unit.

[0015] Optionally, in the embodiments of the present application, the pulse generator is specifically configured to, when receiving the second control signal and the current input signal is different from the default output signal, send pulse signals of corresponding types to the isolation device according to the default output signal.

[0016] In the above implementation process, by sending pulse signals of corresponding types to the isolation device according to the default output signal when the current input signal is different from the default output signal, it can make the output signal of the isolation device consistent with the default output signal in the case of power supply undervoltage, so as to ensure the accuracy of the output signal, thereby reducing the system failure probability.

[0017] Optionally, in the embodiments of the present application, the transmitting device further includes: a driver; the encoder is specifically configured to, when receiving the first control signal, send pulse signals of corresponding types to the driver based on different input signals; the pulse generator is specifically configured to, when receiving the second control signal, send pulse signals of corresponding types to the driver according to the default output signal; the driver is configured to send the received pulse signals to the isolation device and drive the pulse signals through the isolation barrier of the isolation device.

[0018] In the above implementation process, the driver can drive the pulse signals through the isolation barrier of the isolation device to forward the pulse signals to the receiving device based on the isolation device.

[0019] Optionally, in the embodiments of the present application, the voltage detection unit includes: a voltage division circuit, a comparison circuit, and a control circuit; the voltage division circuit is configured to generate a comparison input voltage based on the supply voltage; the comparison circuit is configured to generate a voltage comparison signal according to the magnitude relationship between the comparison input voltage and a threshold reference voltage; wherein, the threshold reference voltage is configured to be determined based on the operating threshold voltage and the voltage division ratio of the voltage division circuit; the control circuit is configured to generate and send the first control signal to the encoder according to the voltage comparison signal when the supply voltage is higher than or equal to the operating threshold voltage; and generate and send the second control signal to the pulse generator when the supply voltage is lower than the operating threshold voltage.

[0020] In the above implementation process, a comparison input voltage related to the supply voltage is generated based on the voltage division circuit, and a voltage comparison signal is generated based on the comparator according to the magnitude relationship between the comparison input voltage and the threshold reference voltage. Since the threshold reference voltage is determined based on the operating threshold voltage and the voltage division ratio of the voltage division circuit, the voltage comparison signal can represent the magnitude relationship between the supply voltage and the operating threshold voltage. Therefore, the control circuit can generate corresponding control signals according to the voltage comparison signal and realize the control of the output signal of the isolation device, so that in the case of supply undervoltage, the output signal of the isolation device is consistent with the default output signal to ensure the accuracy of the output signal and reduce the system failure probability.

[0021] Optionally, in the embodiments of the present application, the transmitting device is further configured to stop sending pulse signals to the isolation device when the supply voltage is lower than the transmitting threshold voltage; the comparison circuit includes a first comparator and a second comparator; the first comparator is configured to generate a first comparison signal according to the magnitude relationship between the comparison input voltage and a first threshold reference voltage; wherein, the first threshold reference voltage is configured to be determined based on the operating threshold voltage and the voltage division ratio of the voltage division circuit; the second comparator is configured to generate a second comparison signal according to the magnitude relationship between the comparison input voltage and a second threshold reference voltage; wherein, the second threshold reference voltage is configured to be determined based on the transmitting threshold voltage and the voltage division ratio of the voltage division circuit; the control circuit is specifically configured to generate and send the first control signal to the encoder according to the first comparison signal and the second comparison signal when the supply voltage is higher than or equal to the operating threshold voltage; generate and send the second control signal to the pulse generator when the supply voltage is lower than the operating threshold voltage and higher than or equal to the transmitting threshold voltage; generate and send a third control signal to the driver when the supply voltage is lower than the transmitting threshold voltage; the driver is further configured to stop sending pulse signals to the isolation device when receiving the third control signal.

[0022] Optionally, in the embodiments of the present application, the transmitting device is further configured to stop sending pulse signals to the isolation device when the supply voltage is lower than the transmitting threshold voltage; the comparison circuit includes a first comparator and a second comparator; the voltage dividing circuit is specifically configured to generate a first comparison voltage and a second comparison voltage based on the supply voltage; wherein, the first comparison voltage is configured to be determined based on the supply voltage and the voltage ratio between the operating threshold voltage and the third threshold reference voltage; the second comparison voltage is configured to be determined based on the supply voltage and the voltage ratio between the transmitting threshold voltage and the third threshold reference voltage; the first comparator is configured to generate a first comparison signal according to the first comparison voltage and the third threshold reference voltage; the second comparator is configured to generate a second comparison signal according to the second comparison voltage and the third threshold reference voltage; the control circuit is specifically configured to generate and send the first control signal to the encoder according to the first comparison signal and the second comparison signal when the supply voltage is higher than or equal to the operating threshold voltage; generate and send the second control signal to the pulse generator when the supply voltage is lower than the operating threshold voltage and higher than or equal to the transmitting threshold voltage; generate and send a third control signal to the driver when the supply voltage is lower than the transmitting threshold voltage; the driver is further configured to stop sending pulse signals to the isolation device when receiving the third control signal.

[0023] Optionally, in the embodiments of the present application, the pulse generator is specifically configured to send continuous pulse signals of a corresponding type to the isolation device according to the default output signal when receiving the second control signal; wherein, the number of pulses included in the continuous pulse signals is greater than or equal to 2.

[0024] In the above implementation process, since the number of pulses included in the continuous pulse signals is greater than or equal to 2, the redundancy and anti-interference ability of the pulse signals can be improved, the accuracy of the output signal can be further ensured, and the system failure probability can be reduced.

[0025] In a second aspect, the embodiments of the present application provide an isolation system, and the system realizes signal transmission between an input signal and an output signal based on the isolation device as described in any one of the first aspects above.

[0026] The beneficial effects of this application at least include: when the supply voltage is lower than the operating threshold voltage, the isolation device sends a pulse signal of a corresponding type to the isolation device according to the default output signal, so that the receiving device can receive a pulse signal of a type corresponding to the default output signal and output the default output signal. When the power supply of the transmitting device is under-voltage, it can quickly send a pulse signal of a type corresponding to the default output signal to the isolation device based on the transmitting device, so that the receiving device outputs the default output signal according to the type of the received pulse signal, improving the accuracy of the output signal, reducing the probability of system failure, and achieving fast under-voltage protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required to be used in the embodiments of this application. It should be understood that the following drawings only show some embodiments of this application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0028] Figure 1 Structural schematic diagram of an isolation device provided by an embodiment of this application;

[0029] Figure 2 Schematic diagram of protection timing when the power supply is under-voltage provided by an embodiment of this application;

[0030] Figure 3 Another schematic diagram of protection timing when the power supply is under-voltage provided by an embodiment of this application;

[0031] Figure 4 Structural schematic diagram of a transmitting device provided by an embodiment of this application;

[0032] Figure 5 Structural schematic diagram of a voltage detection unit provided by an embodiment of this application;

[0033] Figure 6 Another structural schematic diagram of a voltage detection unit provided by an embodiment of this application;

[0034] Figure 7 Signal transmission schematic diagram of an isolation device provided by an embodiment of this application;

[0035] Figure 8 Another signal transmission schematic diagram of an isolation device provided by an embodiment of this application.

[0036] Reference numerals: 01 - isolation device; 10 - transmitting device; 101 - voltage detection unit; 102 - encoder; 103 - pulse generator; 104 - driver; 20 - isolation device; 30 - receiving device. Detailed implementation manners

[0037] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0039] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0040] Please refer to Figure 1 The structural schematic diagram of an isolation device 01 provided by the embodiment of the present application shown. The isolation device 01 includes: a transmitting device 10, an isolation device 20, and a receiving device 30;

[0041] The isolation device 20 is electrically connected to the transmitting device 10 and the receiving device 30 respectively;

[0042] The transmitting device 10 is configured to, when the supply voltage is higher than or equal to the working threshold voltage, send a corresponding type of pulse signal to the isolation device 20 based on different input signals; when the supply voltage is lower than the working threshold voltage, send a corresponding type of pulse signal to the isolation device 20 according to the default output signal;

[0043] The isolation device 20 is configured to send the received pulse signal to the receiving device 30;

[0044] The receiving device 30 is configured to output a corresponding output signal according to the type of the received pulse signal.

[0045] Among them, the transmitting device 10 may include a voltage detection circuit part and an encoder. The voltage detection circuit part is used to detect the magnitude relationship between the supply voltage and the working threshold voltage, and the encoder is used to send a corresponding type of pulse signal to the isolation device 20 according to the detected magnitude relationship, input signal and default output signal. The received pulse signal is sent to the receiving device 30 through the isolation device 20, and based on the type of the pulse signal received by the receiving device 30, a corresponding output signal is output to achieve isolated transmission of the signal. Moreover, there is no conductor connection between the substrates of the transmitting device 10 and the receiving device 30. That is, there is no direct electrical connection relationship between the transmitting device 10 and the receiving device 30, and only through the isolation device 20, the electrical signal connection between the transmitting device 10 and the receiving device 30 can be indirectly realized under specific circumstances. The number of types of pulse signals is greater than or equal to the number of signal types included in the input signal and the default output signal. Exemplarily, when the number of signal types included in the input signal and the default output signal is the same and the number of signal types is 2, the number of types of pulse signals that the transmitting device 10 can generate can be 2, 3 or other reasonable values greater than 2. When the supply voltage is higher than or equal to the working threshold voltage, the amplitude of the pulse signal sent by the transmitting device 10 is large enough to be recognized and decoded by the receiving device 30. The specific value of the working threshold voltage can be adjusted according to the actual circuit conditions. The isolation device 20 may include an isolation transformer (for example, a chip-level integrated micro-transformer) or an isolation capacitor (for example, a chip-level integrated micro-capacitor). The receiving device 30 may include a decoder, or may include a receiving comparison circuit and a decoder. The receiving comparison circuit is used to compare the signal amplitude of the received pulse signal with the decoding threshold voltage, and when the signal amplitude is greater than or equal to the decoding threshold voltage, the received pulse signal is sent to the decoder. The decoder is used to decode the received pulse signal and output the decoded output signal. In order to protect the safety of the circuit at the rear stage of the isolation device 01, the isolation device 01 has a default output signal, so that when the transmitting device 10 is accidentally powered off or the power supply is undervoltage, that is, when the receiving device 30 does not receive any pulse signals within a preset time interval, the receiving device 30 can output this determined default output signal. The receiving device 30 will output the latest received pulse signal. When the receiving device 30 does not receive a pulse signal within a preset time interval, the receiving device 30 will output and maintain the current logic level; when the receiving device has not received a pulse signal after exceeding the preset time interval, the receiving device 30 will set its output to the default output signal; the receiving device 30 will also set its output to the default output signal when the power is powered on and reset. When the supply voltage of the transmitting device 10 is higher than or equal to the working threshold voltage, based on the difference in the input signal, the time interval between the corresponding type of pulse signals sent to the isolation device 20 is less than the preset time interval.When the supply voltage is lower than the operating threshold voltage, the transmitting device 10 sends a corresponding type of pulse signal to the isolation device 20 according to the default output signal, and based on the isolation device 20, the received pulse signal is sent to the receiving device 30, so that the receiving device 30 can quickly send a pulse signal of the corresponding type to the isolation device 20 when a power supply undervoltage occurs, and the receiving device 30 outputs the default output signal according to the type of the received pulse signal to achieve fast undervoltage protection.

[0046] Please refer to Figure 2 , Figure 2 which is a schematic diagram of the protection timing when the power supply is undervoltage provided by the embodiment of the present application. Figure 2 Specifically shown is a schematic diagram of the protection timing when a power supply undervoltage occurs based on the existing edge modulation technology. Please refer to Figure 3 , Figure 3 which is another schematic diagram of the protection timing when the power supply is undervoltage provided by the embodiment of the present application. Figure 3 Specifically shown is a schematic diagram of the protection timing when a power supply undervoltage occurs based on the isolation device 01 provided by the present application. Figure 2 , Figure 3 In

[0047] As Figure 2 shown, based on the existing edge modulation technology, the receiving device starts timing after receiving a pulse, and starts timing again every time a pulse signal is received. When the timing duration exceeds the undervoltage protection judgment time t q , the default level is output. The undervoltage protection judgment time t q must be greater than the maximum pulse interval time of the transmitting device, otherwise it will affect the signal transmission. Therefore, the receiving device has to wait for a long time to obtain the undervoltage information on the transmitting side, and the output signal may be incorrect during this waiting time, which may cause the system to malfunction.

[0048] As Figure 3As shown, based on the isolation device 01 provided in the present application, when the power supply of the transmitting device 10 is under-voltage, a pulse signal corresponding to the type of the default output signal can be quickly sent to the isolation device 20 based on the transmitting device, so that the receiving device 30 outputs the default output signal according to the type of the received pulse signal. Therefore, the receiving device can obtain the under-voltage information of the power supply on the transmitting side without long-time timing and waiting. The delay (ty) from the under-voltage of the power supply on the transmitting side to the output of the default level by the receiving device is equivalent to the signal transmission delay, thereby avoiding the output error of the receiving device. Figure 3 Specifically, it shows the situation where the input signal is at a high level when the power supply is under-voltage, the first type of pulse signal corresponds to the high level, and the second type of pulse signal corresponds to the default output signal (low level).

[0049] It can be seen that the isolation device 01 provided in the embodiment of the present application, when the power supply voltage is lower than the working threshold voltage, sends a pulse signal of a corresponding type to the isolation device 20 according to the default output signal, so that the receiving device 30 can receive a pulse signal corresponding to the type of the default output signal and output the default output signal. When the power supply of the transmitting device 10 is under-voltage, a pulse signal corresponding to the type of the default output signal can be quickly sent to the isolation device 20 based on the transmitting device, so that the receiving device 30 outputs the default output signal according to the type of the received pulse signal, improving the accuracy of the output signal, reducing the system failure probability, and realizing fast under-voltage protection.

[0050] In some optional embodiments, the working threshold voltage may include a first working threshold voltage and a second working threshold voltage. When the power supply voltage of the transmitting device 10 is greater than or equal to the first working threshold voltage, the isolation device 01 starts to work. During the process that the power supply voltage of the transmitting device 10 changes from being greater than or equal to the first working threshold voltage to being equal to the second working threshold voltage, the transmitting device 10 sends a pulse signal of a corresponding type to the isolation device 20 based on different input signals. When the power supply voltage of the transmitting device 10 is lower than the second working threshold voltage, the transmitting device 10 sends a pulse signal of a corresponding type to the isolation device 20 according to the default output signal.

[0051] In some alternative embodiments, the input signal includes a high level and a low level; the transmitting device 10 is specifically configured to, when the supply voltage is higher than or equal to the operating threshold voltage, send a first type of pulse signal to the isolation device 20 if the input signal is at a high level; send a second type of pulse signal to the isolation device 20 if the input signal is at a low level; when the supply voltage is lower than the operating threshold voltage, send the first type of pulse signal to the isolation device 20 if the default output signal is at a high level; send the second type of pulse signal to the isolation device 20 if the default output signal is at a low level; the receiving device 30 is specifically configured to output a high level when receiving the first type of pulse signal; output a low level when receiving the second type of pulse signal.

[0052] Among them, the input signal includes a high level and a low level, that is, it includes logic level 1 and logic level 0. When the supply voltage is higher than or equal to the operating threshold voltage, for a high-level input signal, the transmitting device 10 sends a first type of pulse signal to the isolation device 20, and for a low-level input signal, the transmitting device 10 sends a second type of pulse signal to the isolation device 20. The isolation device 20 sends the received pulse signal to the receiving device 30, that is, when the input signal is at a high level, the receiving device 30 receives the first type of pulse signal and outputs a high level, and when the input signal is at a low level, the receiving device 30 receives the second type of pulse signal and outputs a low level. In addition, when the supply voltage is lower than the operating threshold voltage, for the case where the default output signal is at a high level, the transmitting device 10 sends a first type of pulse signal to the isolation device 20; for the case where the default output signal is at a low level, the transmitting device 10 sends a second type of pulse signal to the isolation device 20. The isolation device 20 sends the received pulse signal to the receiving device 30, that is, when the default output signal is at a high level, the receiving device 30 receives the first type of pulse signal and outputs a high level, and when the default output signal is at a low level, the receiving device 30 receives the second type of pulse signal and outputs a low level. The transmitting device converts the two different input signals of high level and low level into two different types of pulse signals. When the supply voltage is lower than the operating threshold voltage, according to the default output signal, when the default output signal is at a high level, a first type of pulse signal is sent to the isolation device; when the default output signal is at a low level, a second type of pulse signal is sent to the isolation device; and the pulse signal corresponding to the default output signal is sent to the receiving device through the isolation device, so that the receiving device can output a level signal consistent with the default output signal, improving the accuracy of the output signal and reducing the system failure probability.

[0053] Please refer to Figure 4 ,Figure 4 Schematic diagram of the structure of a transmitting device provided by an embodiment of the present application. Figure 4 VDD_TX in [the figure] represents the supply voltage, and INPUT represents the input signal. In some alternative embodiments, as Figure 4 shown, the transmitting device 10 includes: a voltage detection unit 101, an encoder 102, and a pulse generator 103; the voltage detection unit 101 is configured to detect the magnitude relationship between the supply voltage and the operating threshold voltage; and when the supply voltage is higher than or equal to the operating threshold voltage, send a first control signal to the encoder 102; when the supply voltage is lower than the operating threshold voltage, send a second control signal to the pulse generator 103; the encoder 102 is configured to, when receiving the first control signal, send a corresponding type of pulse signal to the isolation device 20 based on the difference in the input signal; the pulse generator 103 is configured to, when receiving the second control signal, send a corresponding type of pulse signal to the isolation device 20 according to the default output signal.

[0054] Among them, the voltage detection unit 101 can be implemented by a comparison device and a control device, detect the magnitude relationship between the supply voltage and the operating threshold voltage based on the comparison device, and generate a comparison detection result; generate a control signal corresponding to the comparison detection result based on the control device. The control terminal of the encoder 102 can be electrically connected to the output terminal of the comparison device to receive the comparison detection result generated by the comparison device based on the magnitude relationship between the supply voltage and the operating threshold voltage. The pulse generator 103 can include an oscillator and a timing control circuit, etc. The encoder 102 can, when receiving the first control signal (that is, the supply voltage is higher than or equal to the operating threshold voltage), send a corresponding type of pulse signal to the isolation device 20 based on the difference in the input signal; the pulse generator 103 can, when receiving the second control signal (that is, the supply voltage is lower than the operating threshold voltage), send a corresponding type of pulse signal to the isolation device 20 according to the default output signal. The received pulse signal is sent to the receiving device 30 through the isolation device 20, that is, when the supply voltage is higher than or equal to the operating threshold voltage, the receiving device 30 receives the pulse signal corresponding to the input signal; when the supply voltage is lower than the operating threshold voltage, the receiving device 30 receives the pulse signal corresponding to the default output signal. So that the receiving device 30 can correctly output an output signal consistent with the input signal when the supply voltage is higher than or equal to the operating threshold voltage, and correctly output an output signal consistent with the default output signal when the supply voltage is lower than the operating threshold voltage, thereby improving the accuracy of the output signal, reducing the system failure probability, and achieving fast undervoltage protection.

[0055] In some alternative embodiments, the pulse generator 103 is specifically configured to, when receiving the second control signal and the current input signal is different from the default output signal, send a pulse signal of a corresponding type to the isolation device 20 according to the default output signal.

[0056] Taking the input signal including a high level and a low level as an example, the cases where the current input signal is different from the default output signal include: the input signal is at a high level and the default output signal is at a low level; and the input signal is at a low level and the default output signal is at a high level. That is to say, when the input signal is at a high level and the default output signal is at a low level, and when the input signal is at a low level and the default output signal is at a high level, the pulse generator 103 sends a pulse signal of a corresponding type to the isolation device 20 according to the default output signal. When the input signal is at a high level and the default output signal is at a high level, and when the input signal is at a low level and the default output signal is at a low level, the pulse generator 103 is not triggered. By sending a pulse signal of a corresponding type to the isolation device 20 according to the default output signal when the current input signal is different from the default output signal, it is possible to make the output signal of the isolation device 20 consistent with the default output signal in the case of power supply undervoltage, so as to ensure the accuracy of the output signal, thereby reducing the system failure probability.

[0057] As Figure 4 shown, in some alternative embodiments, the transmitting device 10 further includes: a driver 104; the encoder 102 is specifically configured to, when receiving the first control signal, send a pulse signal of a corresponding type to the driver 104 based on the difference of the input signal; the pulse generator 103 is specifically configured to, when receiving the second control signal, send a pulse signal of a corresponding type to the driver 104 according to the default output signal; the driver 104 is configured to send the received pulse signal to the isolation device 20 and drive the pulse signal through the isolation barrier of the isolation device 20.

[0058] Among them, the driver 104 may include series inverters with gradually increasing current driving force. The isolation barrier of the isolation device 20 refers to a physical or electronic barrier used to isolate the potential difference between the signal channel and the electrical equipment, ensuring the transmission of signals without direct contact, thereby preventing interference between circuits and protecting the equipment from damage. The isolation device 20 can ensure the integrity of the signal and the safety of the system by blocking the flow of direct current and uncontrolled alternating current and only allowing communication signals and power to pass through the isolation barrier. Through the driver 104, the received signal can be converted into a high-power signal suitable for the input of the isolation device 20 to drive the pulse signal through the isolation barrier of the isolation device 20, and based on the isolation device 20, the pulse signal is forwarded to the receiving device 30.

[0059] In some alternative embodiments, the voltage detection unit 101 includes: a voltage division circuit, a comparison circuit, and a control circuit; the voltage division circuit is configured to generate a comparison input voltage based on the supply voltage; the comparison circuit is configured to generate a voltage comparison signal according to the magnitude relationship between the comparison input voltage and a threshold reference voltage; wherein, the threshold reference voltage is configured to be determined based on the operating threshold voltage and the voltage division ratio of the voltage division circuit; the control circuit is configured to generate and send the first control signal to the encoder 102 according to the voltage comparison signal when the supply voltage is higher than or equal to the operating threshold voltage; and generate and send the second control signal to the pulse generator 103 when the supply voltage is lower than the operating threshold voltage.

[0060] Among them, the voltage division circuit can be implemented by multiple voltage division resistors. And a threshold reference voltage is generated based on a reference module, such as a bandgap reference voltage. By generating a comparison input voltage related to the supply voltage based on the voltage division circuit, and generating a voltage comparison signal based on the comparator according to the magnitude relationship between the comparison input voltage and the threshold reference voltage. Since the threshold reference voltage is determined based on the operating threshold voltage and the voltage division ratio of the voltage division circuit, the voltage comparison signal can characterize the magnitude relationship between the supply voltage and the operating threshold voltage. Therefore, the control circuit can generate corresponding control signals according to the voltage comparison signal and implement the control of the output signal of the isolation device, so that in the case of supply undervoltage, the output signal of the isolation device is consistent with the default output signal to ensure the accuracy of the output signal and reduce the system failure probability.

[0061] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a voltage detection unit provided by an embodiment of the present application. As Figure 5As shown, in some alternative embodiments, the transmitting device 10 is further configured to stop sending pulse signals to the isolation device 20 when the supply voltage VDD_TX is lower than the transmitting threshold voltage; the comparison circuit includes a first comparator B1 and a second comparator B2; the first comparator B1 is configured to generate a first comparison signal according to the magnitude relationship between the comparison input voltage V and the first threshold reference voltage VREF1; wherein, the first threshold reference voltage VREF1 is configured to be determined based on the working threshold voltage and the voltage division ratio of the voltage division circuit; the second comparator B2 is configured to generate a second comparison signal according to the magnitude relationship between the comparison input voltage V and the second threshold reference voltage VREF2; wherein, the second threshold reference voltage VREF2 is configured to be determined based on the transmitting threshold voltage and the voltage division ratio of the voltage division circuit; the control circuit is specifically configured to generate and send the first control signal to the encoder 102 according to the first comparison signal and the second comparison signal when the supply voltage VDD_TX is higher than or equal to the working threshold voltage; generate and send the second control signal to the pulse generator 103 when the supply voltage VDD_TX is lower than the working threshold voltage and higher than or equal to the transmitting threshold voltage; generate and send a third control signal to the driver 104 when the supply voltage VDD_TX is lower than the transmitting threshold voltage; the driver 104 is further configured to stop sending pulse signals to the isolation device 20 when receiving the third control signal.

[0062] Among them, the first comparator B1 and the second comparator B2 can also be implemented by the same comparison device or two different comparison devices. The emission threshold voltage is lower than the operating threshold voltage, and the specific voltage value of the emission threshold voltage can be adjusted according to the actual application situation. The first threshold reference voltage VREF1 is greater than the second threshold reference voltage VREF2, and the difference between the first threshold reference voltage VREF1 and the second threshold reference voltage VREF2 can be between 50 mV and 100 mV. For example, it can be 50 mV, 75 mV, or 100 mV, etc. Since the first comparison signal is generated by the first comparator B1 according to the magnitude relationship between the comparison input voltage V and the first threshold reference voltage VREF1, and the second comparison signal is generated by the second comparator B2 according to the magnitude relationship between the comparison input voltage V and the second threshold reference voltage VREF2, the control circuit can determine the magnitude relationship between the supply voltage VDD_TX and the operating threshold voltage based on the first comparison signal, and determine the magnitude relationship between the supply voltage VDD_TX and the emission threshold voltage based on the second comparison signal; and generate corresponding control signals according to the above magnitude relationships. It should be noted that the first control signal can control the encoder 102 to send corresponding types of pulse signals to the isolation device 20 based on different input signals, and can also prohibit the pulse generator 103 from sending pulse signals to the isolation device 20; the second control signal can control the pulse generator 103 to send corresponding types of pulse signals to the isolation device 20 according to the default output signal, and can also prohibit the encoder 102 from sending pulse signals to the isolation device 20; to ensure that the isolation device 20 can accurately send the received pulse signals to the receiving device 30.

[0063] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of another voltage detection unit provided by an embodiment of this application. As Figure 6As shown, in some alternative embodiments, the transmitting device 10 is further configured to stop sending pulse signals to the isolation device 20 when the supply voltage VDD_TX is lower than the transmitting threshold voltage; the comparison circuit includes a first comparator B1 and a second comparator B2; the voltage dividing circuit is specifically configured to generate a first comparison voltage V1 and a second comparison voltage V2 based on the supply voltage VDD_TX; wherein, the first comparison voltage V1 is configured to be determined based on the supply voltage VDD_TX and the voltage ratio between the operating threshold voltage and the third threshold reference voltage VREF3; the second comparison voltage V2 is configured to be determined based on the supply voltage and the voltage ratio between the transmitting threshold voltage and the third threshold reference voltage VREF3; the first comparator B1 is configured to generate a first comparison signal according to the first comparison voltage V1 and the third threshold reference voltage VREF3; the second comparator B2 is configured to generate a second comparison signal according to the second comparison voltage V2 and the third threshold reference voltage VREF3; the control circuit is specifically configured to generate and send the first control signal to the encoder 102 when the supply voltage VDD_TX is higher than or equal to the operating threshold voltage according to the first comparison signal and the second comparison signal; generate and send the second control signal to the pulse generator 103 when the supply voltage VDD_TX is lower than the operating threshold voltage and higher than or equal to the transmitting threshold voltage; generate and send a third control signal to the driver 104 when the supply voltage VDD_TX is lower than the transmitting threshold voltage; the driver 104 is further configured to stop sending pulse signals to the isolation device 20 when receiving the third control signal.

[0064] Among them, the first comparison voltage V1 is higher than the second comparison voltage V2, and the difference between the first comparison voltage V1 and the second comparison voltage V2 can be between 50 mV and 100 mV. For example, it can be 50 mV, 75 mV or 100 mV, and the present application does not make specific limitations in this regard. Since the first comparison voltage V1 is determined based on the power supply voltage VDD_TX and the voltage ratio between the operating threshold voltage and the third threshold reference voltage VREF3, the second comparison voltage V2 is determined based on the power supply voltage and the voltage ratio between the emission threshold voltage and the third threshold reference voltage, and the first comparison signal is generated by the first comparator B1 according to the first comparison voltage V1 and the third threshold reference voltage VREF3, and the second comparison signal is generated by the second comparator B2 according to the second comparison voltage V2 and the third threshold reference voltage VREF3, the control circuit can determine the magnitude relationship between the power supply voltage VDD_TX and the operating threshold voltage according to the first comparison signal, and determine the magnitude relationship between the power supply voltage VDD_TX and the emission threshold voltage according to the second comparison signal. And according to the above magnitude relationship, corresponding control signals are generated. It should be noted that the first control signal can control the encoder 102 to send corresponding types of pulse signals to the isolation device 20 based on different input signals, and can also prohibit the pulse generator 103 from sending pulse signals to the isolation device 20; the second control signal can control the pulse generator 103 to send corresponding types of pulse signals to the isolation device 20 according to the default output signal, and can also prohibit the encoder 102 from sending pulse signals to the isolation device 20; to ensure that the isolation device 20 can accurately send the received pulse signals to the receiving device 30.

[0065] Among them, specifically, when the power supply voltage VDD_TX is higher than or equal to the operating threshold voltage, the first control signal can be generated and sent to the encoder 102 and the driver 104; to control the encoder 102 to send corresponding types of pulse signals to the isolation device 20 based on different input signals according to the first control signal, and control the driver 104 to drive the pulse signal through the isolation barrier of the isolation device 20. It is also possible to generate and send the second control signal to the pulse generator 103 and the driver 104 when the power supply voltage VDD_TX is lower than the operating threshold voltage but higher than the emission threshold voltage; to control the pulse generator 103 to send pulse signals of corresponding types to the isolation device 20 according to the default output signal based on the second control signal, and control the driver 104 to drive the pulse signal through the isolation barrier of the isolation device 20. By generating and sending a third control signal to the driver 104 when the power supply voltage VDD_TX is lower than the emission threshold voltage, the driver 104 is controlled to stop sending pulse signals to the isolation device 20.

[0066] As Figure 7 shown, Figure 7Schematic diagram of signal transmission of an isolation device provided by an embodiment of the present application. As Figure 8 shown, Figure 8 Schematic diagram of signal transmission of another isolation device provided by an embodiment of the present application. As Figure 7 , Figure 8 shown, the high-level signal corresponds to a first type of pulse signal, and the low-level signal corresponds to a second type of pulse signal; the first control signal, the second control signal, and the third control signal may respectively include an encoder control signal, a pulse generator control signal, and a driver control signal. Among them, when the encoder control signal is high level, it means enabling the encoder 102 to send corresponding types of pulse signals to the isolation device 20 based on different input signals; when the encoder control signal is low level, it means disabling the encoder 102 from sending corresponding types of pulse signals to the isolation device 20 based on different input signals. Correspondingly, when the pulse generator control signal is high level, it means enabling the pulse generator 103 to send pulse signals of a corresponding type to the isolation device 20 according to the default output signal; when the pulse generator control signal is low level, it means disabling the pulse generator 103 from sending pulse signals of a corresponding type to the isolation device 20 according to the default output signal. When the driver control signal is high level, it means enabling the driver 104 to drive the pulse signal through the isolation barrier of the isolation device 20; when the driver control signal is low level, it means disabling the driver 104 from driving the pulse signal through the isolation barrier of the isolation device 20. In this case, the first control signal may specifically include an encoder enable control signal, a pulse generator disable control signal, and a driver enable control signal, the second control signal may specifically include an encoder disable control signal, a pulse generator enable control signal, and a driver enable control signal, and the third control signal may specifically include an encoder disable control signal, a pulse generator disable control signal, and a driver disable control signal. Figure 7 Specifically shows the schematic diagram of signal transmission of the isolation device 01 in the case where the default output signal is low level. Figure 8 Specifically shows the schematic diagram of signal transmission of the isolation device 01 in the case where the default output signal is high level. As Figure 7 , Figure 8 shown, the isolation device 01 provided by the present application can, in the case of power supply undervoltage, quickly send pulse signals of a type corresponding to the default output signal to the isolation device 20 based on the pulse generator 103 and the driver 104 in the transmitting device 10, so that the receiving device 30 outputs the default output signal according to the type of the received pulse signal, improving the accuracy of the output signal, reducing the probability of system failure, and realizing fast undervoltage protection.

[0067] In some alternative embodiments, the pulse generator 103 is specifically configured to, upon receiving the second control signal, send a continuous pulse signal of a corresponding type to the isolation device 20 according to the default output signal; wherein, the number of pulses included in the continuous pulse signal is greater than or equal to 2.

[0068] Among them, when the default output signal of the pulse generator 103 is a high-level signal, a continuous pulse signal of the first type is sent to the isolation device 20; when the default output level is a low-level signal, a continuous pulse signal of the second type is sent to the isolation device 20. In this way, the receiving device 30 can decode and output the default output signal according to the different types of continuous pulse signals received. Among them, the time interval between the corresponding type pulse signals sent by the pulse generator 103 is less than the preset time interval. Since the number of pulses included in the continuous pulse signal is greater than or equal to 2, the redundancy and anti-interference ability of the pulse signal can be improved, the accuracy of the output signal can be further ensured, and the system failure probability can be reduced.

[0069] The embodiment of the present application also provides an isolation system, and the system realizes signal transmission between an input signal and an output signal based on the isolation device 01 as described in any one of the above first aspects.

[0070] In several embodiments provided by the embodiments of the present application, it should be understood that the disclosed device / system can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the drawings show the possible architectures, functions, and operations of the devices according to multiple embodiments of the embodiments of the present application. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0071] In addition, in each embodiment of the embodiments of the present application, the various functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0072] The above description is only an alternative implementation manner of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the embodiments of the present application, and all should be covered within the protection scope of the embodiments of the present application.

Claims

1. An isolation device, characterized in that, The device includes: a transmitting device, an isolation device, and a receiving device; The isolation device is electrically connected to the transmitting device and the receiving device respectively; The transmitting device is configured to, when the supply voltage is higher than or equal to the operating threshold voltage, send a corresponding type of pulse signal to the isolation device based on the difference of the input signal; when the supply voltage is lower than the operating threshold voltage, send a corresponding type of pulse signal to the isolation device according to the default output signal; The isolation device is configured to send the received pulse signal to the receiving device; The receiving device is configured to output a corresponding output signal according to the type of the received pulse signal.

2. The device according to claim 1, wherein Wherein, The input signal includes a high level and a low level; The transmitting device is specifically configured to, when the supply voltage is higher than or equal to the operating threshold voltage, if the input signal is a high level, send a first type of pulse signal to the isolation device; if the input signal is a low level, send a second type of pulse signal to the isolation device; when the supply voltage is lower than the operating threshold voltage, if the default output signal is a high level, send the first type of pulse signal to the isolation device; if the default output signal is a low level, send the second type of pulse signal to the isolation device; The receiving device is specifically configured to output a high level when receiving the first type of pulse signal; output a low level when receiving the second type of pulse signal.

3. The device according to claim 1 or 2, characterized in that, The transmitting device includes: a voltage detection unit, an encoder, and a pulse generator; The voltage detection unit is configured to detect the magnitude relationship between the supply voltage and the operating threshold voltage; and when the supply voltage is higher than or equal to the operating threshold voltage, send a first control signal to the encoder; when the supply voltage is lower than the operating threshold voltage, send a second control signal to the pulse generator; The encoder is configured to, when receiving the first control signal, send a corresponding type of pulse signal to the isolation device based on the difference of the input signal; The pulse generator is configured to, when receiving the second control signal, send a corresponding type of pulse signal to the isolation device according to the default output signal.

4. The device according to claim 3, characterized in that, The pulse generator is specifically configured to, when receiving the second control signal and the current input signal is different from the default output signal, send a corresponding type of pulse signal to the isolation device according to the default output signal.

5. The device according to claim 3, characterized in that, The transmitting device further includes: a driver; The encoder is specifically configured to, when receiving the first control signal, send a corresponding type of pulse signal to the driver based on the difference of the input signal; The pulse generator is specifically configured to, when receiving the second control signal, send a corresponding type of pulse signal to the driver according to the default output signal; The driver is configured to send the received pulse signal to the isolation device and drive the pulse signal through the isolation barrier of the isolation device.

6. The device according to claim 5, characterized in that The voltage detection unit includes: a voltage division circuit, a comparison circuit, and a control circuit; The voltage division circuit is configured to generate a comparison input voltage based on the supply voltage; The comparison circuit is configured to generate a voltage comparison signal according to the magnitude relationship between the comparison input voltage and a threshold reference voltage; wherein, the threshold reference voltage is configured to be determined based on the operating threshold voltage and the voltage division ratio of the voltage division circuit; The control circuit is configured to generate and send the first control signal to the encoder according to the voltage comparison signal when the supply voltage is higher than or equal to the operating threshold voltage; and generate and send the second control signal to the pulse generator when the supply voltage is lower than the operating threshold voltage.

7. The device according to claim 6, characterized in that, Wherein, The transmitting device is further configured to stop sending pulse signals to the isolation device when the supply voltage is lower than the transmitting threshold voltage; The comparison circuit includes a first comparator and a second comparator; The first comparator is configured to generate a first comparison signal according to the magnitude relationship between the comparison input voltage and a first threshold reference voltage; wherein, the first threshold reference voltage is configured to be determined based on the operating threshold voltage and the voltage division ratio of the voltage division circuit; The second comparator is configured to generate a second comparison signal according to the magnitude relationship between the comparison input voltage and a second threshold reference voltage; wherein, the second threshold reference voltage is configured to be determined based on the transmitting threshold voltage and the voltage division ratio of the voltage division circuit; The control circuit is specifically configured to generate and send the first control signal to the encoder according to the first comparison signal and the second comparison signal when the supply voltage is higher than or equal to the operating threshold voltage; Generate and send the second control signal to the pulse generator when the supply voltage is lower than the operating threshold voltage and higher than or equal to the transmitting threshold voltage; Generate and send a third control signal to the driver when the supply voltage is lower than the transmitting threshold voltage; The driver is further configured to stop sending pulse signals to the isolation device when receiving the third control signal.

8. The device according to claim 6, characterized in that Wherein, The transmitting device is further configured to stop sending pulse signals to the isolation device when the supply voltage is lower than the transmitting threshold voltage; The comparison circuit includes a first comparator and a second comparator; The voltage division circuit is specifically configured to generate a first comparison voltage and a second comparison voltage based on the supply voltage; wherein, the first comparison voltage is configured to be determined based on the supply voltage and the voltage ratio between the operating threshold voltage and a third threshold reference voltage; the second comparison voltage is configured to be determined based on the supply voltage and the voltage ratio between the transmitting threshold voltage and the third threshold reference voltage; The first comparator is configured to generate a first comparison signal according to the first comparison voltage and the third threshold reference voltage; The second comparator is configured to generate a second comparison signal according to the second comparison voltage and the third threshold reference voltage; The control circuit is specifically configured to generate and send the first control signal to the encoder according to the first comparison signal and the second comparison signal when the supply voltage is higher than or equal to the operating threshold voltage; generate and send the second control signal to the pulse generator when the supply voltage is lower than the operating threshold voltage and higher than or equal to the emission threshold voltage; generate and send the third control signal to the driver when the supply voltage is lower than the emission threshold voltage; The driver is further configured to stop sending pulse signals to the isolation device when receiving the third control signal.

9. The device according to claim 3, characterized in that, Wherein, the pulse generator is specifically configured to send continuous pulse signals of a corresponding type to the isolation device according to the default output signal when receiving the second control signal; wherein, the number of pulses included in the continuous pulse signals is greater than or equal to 2.

10. An isolation system, characterized in that, The system realizes signal transmission between the input signal and the output signal based on the isolation device according to any one of claims 1-9 above.

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