A power state indication circuit and power supply

Abstract

The application provides a power supply state indication circuit and a power supply, which are applied to the field of power electronics technology, and the circuit comprises a verification circuit, a driving circuit and a state indication circuit. The verification circuit is connected with a power supply end of a field side power supply. In the case that the field side power supply outputs a power supply voltage, a high level signal is outputted, or in the case that the field side power supply does not output the power supply voltage, a low level signal is outputted. The driving circuit outputs a first driving signal in response to the high level signal, or outputs a second driving signal in response to the low level signal. The state indication circuit indicates that the field side power supply is in a power supply state in response to the first driving signal, or indicates that the field side power supply is not in the power supply state in response to the second driving signal. The circuit is directly connected with the power supply end of the field side power supply, is in the field side together with the field side power supply, is not affected by the power supply condition of a system side, can reliably indicate the power supply state of the field side power supply, and ensures the safety of power utilization.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, specifically to a power status indication circuit and a power supply. Background Technology

[0002] In industrial control environments, power is supplied to electrical loads via field-side power supplies. In practical applications, whether for monitoring the power supply status of electrical loads or ensuring electrical safety, it is necessary to clearly display whether the field-side power supply is in a power supply state.

[0003] To meet the above requirements, the prior art uses an indicator circuit to indicate the power supply status of the field-side power supply. Specifically, the indicator circuit includes a controller and a power indicator light. The controller collects the power supply voltage of the field-side power supply and controls the power indicator light through a control pin. The status of the power indicator light indicates whether the field-side power supply is in a power supply state.

[0004] The inventors discovered that the indicator circuit provided by the existing technology is a system-side circuit, and its operation is affected by the power supply status of the system side. When the system side loses power, the indicator circuit will stop working, which not only fails to reliably indicate the power supply status of the field side power supply, but may even affect electrical safety. Utility Model Content

[0005] In view of this, this application aims to provide a power status indication circuit and power supply to reliably indicate whether the field-side power supply is in a power supply state, thereby ensuring electrical safety.

[0006] In a first aspect, this application provides a power status indication circuit, comprising: The verification circuit is connected to the power supply terminal of the field power supply. When the field power supply outputs the power supply voltage, it outputs a high-level signal, or when the field power supply does not output the power supply voltage, it outputs a low-level signal. A driving circuit, connected to the output terminal of the verification circuit, outputs a first driving signal in response to the high-level signal, or outputs a second driving signal in response to the low-level signal; A status indication circuit, connected to the output terminal of the drive circuit, indicates that the field-side power supply is in a power-on state in response to the first drive signal, or indicates that the field-side power supply is not in a power-on state in response to the second drive signal.

[0007] In one optional implementation, the verification circuit includes: A sampling circuit, wherein the sampling terminal of the sampling circuit is connected to the power supply terminal of the field-side power supply, and is used to sample the voltage of the power supply terminal and output the corresponding sampling voltage; A comparator circuit, wherein the input terminal of the comparator circuit is connected to the output terminal of the sampling circuit; The comparison circuit is used to compare the magnitude relationship between the sampled voltage and the preset threshold voltage, and outputs the high-level signal when the sampled voltage is greater than the preset threshold voltage, or outputs the low-level signal when the sampled voltage is less than the preset threshold voltage.

[0008] In one optional implementation, the sampling circuit includes a first resistor and a second resistor, wherein, One end of the first resistor serves as the sampling terminal of the sampling circuit, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; The connection point of the first resistor and the second resistor serves as the output terminal of the sampling circuit.

[0009] In one optional embodiment, the verification circuit further includes: a first Zener diode, wherein, The cathode of the first Zener diode is connected to the input terminal of the comparator circuit, and the anode of the first Zener diode is grounded.

[0010] In one optional implementation, the driving circuit includes: a third resistor, a second Zener diode, and an AND gate, wherein, One end of the third resistor is connected to the power supply terminal of the field-side power supply, and the other end of the third resistor is connected to the first input terminal of the AND gate; The cathode of the second Zener diode is connected to the first input terminal of the AND gate, and the anode of the second Zener diode is grounded. The second input terminal of the AND gate is connected to the output terminal of the verification circuit; The output terminal of the AND gate serves as the output terminal of the driving circuit.

[0011] In one optional implementation, the status indication circuit includes a fourth resistor and a light-emitting diode, wherein, One end of the fourth resistor is connected to the output terminal of the driving circuit, and the other end of the fourth resistor is connected to the anode of the light-emitting diode, while the cathode of the light-emitting diode is grounded.

[0012] In an optional implementation, the status indication circuit further includes a capacitor, wherein, The capacitor is connected in parallel with the light-emitting diode.

[0013] In an optional embodiment, the power status indication circuit provided in the first aspect of this application further includes: an undervoltage monitoring circuit, wherein, The input terminal of the undervoltage monitoring circuit is connected to the output terminal of the drive circuit; In response to the first drive signal, the undervoltage monitoring circuit outputs a first monitoring signal indicating that the field-side power supply is normal; In response to the second drive signal, the undervoltage monitoring circuit outputs a second monitoring signal indicating an abnormal power supply on the field side.

[0014] In one optional embodiment, the undervoltage monitoring circuit includes: an optocoupler, a fifth resistor, and a sixth resistor, wherein, One end of the fifth resistor serves as the input terminal of the undervoltage monitoring circuit, and the other end of the fifth resistor is connected to the control side input terminal of the optocoupler. The control-side output terminal of the optocoupler is grounded; One end of the sixth resistor receives a preset voltage, and the other end of the sixth resistor is connected to the controlled input terminal of the optocoupler. The controlled-side output terminal of the optocoupler is grounded; The connection point between the sixth resistor and the optocoupler serves as the output terminal of the undervoltage monitoring circuit.

[0015] Secondly, this application provides a power supply, including: a power supply circuit and a power supply status indication circuit as described in any embodiment of the first aspect of this application, wherein... The power supply status indicator circuit is connected to the output terminal of the power supply circuit and is used to indicate the power supply status of the power supply circuit.

[0016] Based on the above, the power status indication circuit provided in this application includes a verification circuit, a driving circuit, and a status indication circuit. The verification circuit is connected to the power supply terminal of the field-side power supply and outputs a high-level signal when the field-side power supply outputs a supply voltage, or outputs a low-level signal when the field-side power supply does not output the supply voltage. The driving circuit is connected to the output terminal of the verification circuit and outputs a first driving signal in response to a high-level signal, or outputs a second driving signal in response to a low-level signal. The status indication circuit indicates that the field-side power supply is in a power supply state in response to the first driving signal, or indicates that the field-side power supply is not in a power supply state in response to the second driving signal. Compared with the prior art, the power status indication circuit provided in this application is directly connected to the power supply terminal of the field-side power supply. Its operation process and the output of the power status indication result are directly related to the field-side power supply, that is, it is simultaneously on the field side with the field-side power supply. The indication of the power supply status of the field-side power supply is not affected by the power supply status of the system side. Therefore, it can reliably indicate whether the field-side power supply is in a power supply state, ensuring power safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural block diagram of a power status indication circuit provided in an embodiment of the present utility model.

[0019] Figure 2 This is a circuit topology diagram of a power status indication circuit provided in an embodiment of this utility model.

[0020] Figure 3 This is a circuit topology diagram of another power status indication circuit provided in this embodiment of the present invention.

[0021] Figure 4 This is a structural block diagram of another power status indication circuit provided in this embodiment of the utility model.

[0022] Figure 5 The present invention provides a circuit topology diagram of another power status indication circuit. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] As mentioned above, the indicator circuit provided by the prior art is a system-side circuit, and its operation is affected by the power supply status of the system side. When the system side loses power, the indicator circuit will stop working, which not only fails to reliably indicate the power supply status of the field side power supply, but may even affect electrical safety.

[0025] To address the aforementioned issues, this application provides a power status indication circuit that is directly connected to the power supply terminal of the field-side power supply. Its operation and the output of the power status indication result are directly related to the field-side power supply, meaning that it is simultaneously located on the field side with the field-side power supply. The indication of the power supply status of the field-side power supply is not affected by the power supply status of the system side. Therefore, it can reliably indicate whether the field-side power supply is in a power supply state, ensuring electrical safety.

[0026] Based on the above, see Figure 1The power status indication circuit provided in this application embodiment includes: a verification circuit 10, a driving circuit 20, and a status indication circuit 30.

[0027] Specifically, in combination Figure 1 As shown, the input terminal of the verification circuit 10 is connected to the power supply terminal of the field power supply P1 to detect the power supply status of the field power supply P1. When the field power supply P1 is operating normally and outputting the power supply voltage, the verification circuit 10 outputs a high-level signal through the output terminal. Conversely, when the field power supply P1 is powered off and does not output the power supply voltage, or when the field power supply P1 is malfunctioning and unable to output the power supply voltage, the verification circuit 10 outputs a low-level signal through the output terminal.

[0028] The input terminal of the driving circuit 20 is connected to the output terminal of the verification circuit 10, receiving a high-level signal or a low-level signal provided by the verification circuit 10. In the various embodiments provided in this application, the driving circuit 20 is used to improve the driving capability of the verification circuit 10, that is, to ensure that the status indication circuit 30 connected to the subsequent stage can be reliably driven and correctly indicate the power supply status of the field-side power supply P1. Based on this, the driving circuit 20 responds to the aforementioned high-level signal by outputting a first driving signal, or the driving circuit 20 responds to the aforementioned low-level signal by outputting a second driving signal. The specific implementation of the driving circuit 20 will be detailed in subsequent embodiments and will not be described in detail here.

[0029] Furthermore, the status indication circuit 30 is connected to the output terminal of the drive circuit 20, and receives the first drive signal or the second drive signal output by the drive circuit 20 through the output terminal. In response to the first drive signal, the status indication circuit 30 indicates that the field-side power supply P1 is in a power-on state; correspondingly, in response to the second drive signal, the status indication circuit 30 indicates that the field-side power supply P1 is not in a power-on state.

[0030] In practical applications, the status indicator circuit 30 can indicate whether the field-side power supply P1 is in a power-on state in various ways. In one optional embodiment, the status indicator circuit 30 can indicate whether the field-side power supply P1 is in a power-on state using a light. For example, when the status indicator circuit 30 illuminates the light, it indicates that the field-side power supply P1 is in a power-on state; conversely, when the status indicator circuit 30 turns off the light, it indicates that the field-side power supply P1 is not in a power-on state. In another optional embodiment, the status indicator circuit 30 can indicate whether the field-side power supply P1 is in a power-on state using sound. For example, when the status indicator circuit 30 continuously emits a beep at a preset frequency, it indicates that the field-side power supply P1 is in a power-on state; conversely, when the status indicator circuit 30 stops emitting the beep, it indicates that the field-side power supply P1 is not in a power-on state. Of course, the status indicator circuit 30 can also indicate whether the field-side power supply P1 is in a power-on state in other ways, which will not be listed here. These methods, without exceeding the core concept of this application, also fall within the scope of protection of this application.

[0031] In summary, combining the foregoing content and Figure 1 As shown, the power status indication circuit provided in this embodiment has a verification circuit 10 directly connected to the field-side power supply P1. The operation of the power status indication circuit is directly driven by the field-side power supply P1 and has no relation to the system-side power supply. In other words, the power status indication circuit and the field-side power supply P1 provided in this embodiment are both located on the field side. The indication of the power supply status of the field-side power supply is not affected by the power supply status of the system side. Therefore, it can reliably indicate whether the field-side power supply is in a power supply state, ensuring power safety.

[0032] This application also provides another power status indication circuit, see [link to relevant documentation] Figure 2 As shown, in the power status indication circuit provided in this embodiment, the verification circuit 10 includes a sampling circuit 110 and a comparison circuit 120, the driving circuit 20 includes a third resistor R3, an AND gate U1 and a second Zener diode D2, and the status indication circuit 30 includes a fourth resistor R4 and a light-emitting diode D3.

[0033] Specifically, the sampling circuit 110 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 serves as the sampling terminal of the sampling circuit 110, which is also the input terminal of the verification circuit 10, and is connected to the power supply terminal of the field-side power supply P1. The other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded. The connection point of the first resistor R1 and the second resistor R2 serves as the output terminal of the sampling circuit 110. The first resistor R1 and the second resistor R2 are connected in series to the power supply terminal of the field-side power supply P1 to divide the supply voltage of the field-side power supply P1, i.e., to sample the voltage. The obtained voltage division result is the corresponding sampling voltage. It can be understood that when the first resistor R1 and the second resistor R2 are selected, the voltage division ratio of the sampling circuit 110 is also determined. The sampling voltage output by the sampling circuit 110 is positively correlated with the supply voltage of the field-side power supply P1, that is, the sampling voltage increases as the supply voltage increases and decreases as the supply voltage decreases. Therefore, the sampling voltage can accurately reflect the changes in the supply voltage of the field-side power supply P1. Furthermore, as can be seen from the following content, the output terminal of the sampling circuit 110 is connected to the input terminal of the comparator circuit 120, and the sampled voltage is output to the comparator circuit 120. Therefore, the voltage division ratio of the sampling circuit 110, i.e. the specific resistance values ​​of the first resistor R1 and the second resistor R2, can be determined by combining the voltage tolerance level of the comparator circuit 120 and the power supply voltage amplitude of the field-side power supply P1. Under the premise of ensuring that the sampled voltage will not affect the safe operation of the comparator circuit 120, this application does not limit the specific resistance values ​​of the first resistor R1 and the second resistor R2.

[0034] The input terminal VCC of the comparator circuit 120 is connected to the output terminal of the sampling circuit 110, and the ground terminal GND is grounded. The output terminal RES of the comparator circuit 120 serves as the output terminal of the verification circuit 10 and is connected to the input terminal of the drive circuit 20. Based on the aforementioned connection relationship, the comparator circuit 120 compares the magnitude of the obtained sampled voltage with the preset threshold voltage, and outputs a high-level signal when the sampled voltage is greater than the preset threshold voltage, or outputs a low-level signal when the sampled voltage is less than the preset threshold voltage. In conjunction with the foregoing, the sampled voltage output by the sampling circuit 110 is positively correlated with the supply voltage of the field-side power supply P1. In order to accurately measure the change of the supply voltage, the preset threshold voltage can also be determined based on the supply voltage output by the field-side power supply P1 under normal operating conditions. This application does not limit the specific value of the preset threshold voltage.

[0035] As an optional implementation, the comparator circuit 120 can be built based on an operational amplifier. The positive input terminal of the operational amplifier serves as the input terminal of the comparator circuit 120 to receive the sampled voltage, while the inverting input terminal of the operational amplifier is used to receive a preset threshold voltage. The magnitude relationship between the sampled voltage and the preset threshold voltage is then compared. As for the specific circuit implementation of the comparator circuit 120 based on the operational amplifier, please refer to relevant technologies, which will not be detailed here.

[0036] In another alternative implementation, the comparator circuit 120 may also be implemented using an integrated circuit chip with voltage comparison function in the related art, which will not be described in detail here.

[0037] The driving circuit 20 includes a third resistor R3, an AND gate U1, and a second Zener diode D2, combined with Figure 2 As shown, AND gate U1 has a first input terminal, a second input terminal, and an output terminal. One end of the third resistor R3 serves as the second input terminal of the drive circuit 20 and is connected to the power supply terminal of the field-side power supply P1. The other end of the third resistor R3 is connected to the first input terminal of AND gate U1. The second input terminal of AND gate U1 serves as the second input terminal of the drive circuit 20 and is connected to the output terminal of the verification circuit 10. The cathode of the second Zener diode D2 is connected to the first input terminal of AND gate U1, and the anode of the second Zener diode D2 is grounded. The output terminal of AND gate U1 serves as the output terminal of the drive circuit 20. Furthermore, the power supply terminal of AND gate U1 is also connected to the connection point of the third resistor R3 and the second Zener diode D2, and the ground terminal of AND gate U1 is grounded.

[0038] Based on the above connection, when the field-side power supply P1 outputs a supply voltage, the second Zener diode D2 is reverse-biased, clamping the voltage at the first input terminal of AND gate U1 to the forward voltage of the second Zener diode D2. Generally, the forward voltage of the second Zener diode D2 is much smaller than the supply voltage output by the field-side power supply P1. Through the voltage clamping effect of the second Zener diode D2, the voltage level is converted, transforming the supply voltage provided by the field-side power supply P1 into the forward voltage of the second Zener diode D2. This forward voltage not only serves as the operating voltage required for AND gate U1 to operate, ensuring its normal operation, but also serves as an input signal for AND gate U1. It can be understood that for AND gate U1, the forward voltage of the second Zener diode D2 can be considered a high level; that is, when the field-side power supply P1 outputs a supply voltage, the signal received at the first input terminal of AND gate U1 is "1". During this process, the third resistor R3 mainly serves as a current-limiting protection, ensuring reliable and safe conduction of the second Zener diode D2, and working together with the second Zener diode D2 to achieve the above functions. Of course, the second Zener diode D2 can also play a certain protective role. For example, if the supply voltage of the field power supply P1 rises abnormally, the second Zener diode D2 will conduct, clamping the voltage at the first input terminal of AND gate U1 to the conduction voltage of the second Zener diode D2, thereby ensuring the safe operation of AND gate U1.

[0039] As for the specific selection of the second Zener diode D2, it can be determined by combining the maximum withstand voltage of AND gate U1 and the maximum supply voltage that the field-side power supply P1 may have during operation. This application does not limit it in this regard.

[0040] Based on the above, it can be seen that when the field-side power supply P1 outputs its supply voltage, AND gate U1 operates normally. Simultaneously, the first input of AND gate U1 receives a high level. According to the operating characteristics of AND gates, in this case, the final output of AND gate U1 will be determined by the output of the verification circuit 10. That is, when the verification circuit 10 outputs a high-level signal, AND gate U1 outputs a high level, i.e., the first drive signal; conversely, when the verification circuit 10 outputs a low-level signal, AND gate U1 outputs a low level, i.e., the second drive signal. Therefore, the drive circuit 20 does not change the type of the output signal of the verification circuit 10, but rather enhances the driving capability of the subsequent circuits by setting AND gate U1, ensuring that the subsequent status indicator circuit 30 can correctly indicate the power supply status of the field-side power supply P1.

[0041] The power status indication circuit provided in this embodiment can achieve dual redundancy verification of the power supply status of the field-side power supply P1 by setting an AND gate. That is, the first drive signal will only be output when the power supply voltage of the field-side power supply P1 is received and the verification circuit 10 provides a high-level signal at the same time. This setting can effectively avoid the influence of abnormal operation of the verification circuit 10 on the status indication result, thereby improving the reliability of the final status indication result.

[0042] The status indicator circuit 30 includes a fourth resistor R4 and a light-emitting diode D3, combined with... Figure 2 As shown, one end of the fourth resistor R4 is connected to the output of AND gate U1, and the other end of the fourth resistor R4 is connected to the anode of LED D3, while the cathode of LED D3 is grounded. When AND gate U1 outputs a high level, i.e., the first drive signal, LED D3 lights up to indicate that the field-side power supply P1 is in a power-on state. Conversely, when AND gate U1 outputs a low level, i.e., the second drive signal, LED D3 turns off to indicate that the field-side power supply P1 is not in a power-on state. During the conduction of LED D3, the current limiting effect of the fourth resistor R4 ensures the safe operation of LED D3.

[0043] This application also provides another power status indication circuit, see [link to relevant documentation] Figure 3 As shown, in the power status indication circuit provided in this embodiment, the verification circuit 10 further includes a first Zener diode D1 and a seventh resistor R7, and the status indication circuit 30 further includes a capacitor C1.

[0044] Combination Figure 3 As shown, the cathode of the first Zener diode D1 is connected to the input terminal of the comparator circuit 120, and the anode of the first Zener diode D1 is grounded. As described above, the sampling voltage output by the sampling circuit 110 is positively correlated with the supply voltage of the field-side power supply P1, increasing with the increase of the supply voltage. This means that if the field-side power supply P1 malfunctions and its supply voltage increases instantaneously, the sampling voltage output by the sampling circuit 110 will also increase instantaneously, potentially causing overvoltage damage to the comparator circuit 120. Therefore, to ensure the safe operation of the comparator circuit 120, the first Zener diode D1 is connected in series at the input terminal of the comparator circuit 120. When the sampling voltage output by the sampling circuit 120 is too high, the first Zener diode D1 conducts, clamping the voltage at the input terminal of the comparator circuit 120 to the conduction voltage of the first Zener diode D1, thereby ensuring the safety of the comparator circuit 120.

[0045] The verification circuit 10 also includes a seventh resistor R7, combined with... Figure 3As shown, one end of the seventh resistor R7 is connected to the output of the comparator circuit 120, and the other end is grounded. The seventh resistor R7 mainly acts as a pull-down resistor. In the initial stage of power-on of the power status indicator circuit, the comparator circuit 120 should theoretically output a low level. However, due to various factors such as electromagnetic interference and unstable power supply voltage of the field power supply P1, the output of the comparator circuit 120 may be unstable. For example, it may trigger a brief spike (i.e., high level) signal, which may lead to misjudgment by the subsequent circuit. By setting the seventh resistor R7, the output of the comparator circuit 120 can be pulled down to a low level during the aforementioned unstable stage to avoid signal fluctuation.

[0046] The status indicator circuit 30 also includes capacitor C1, combined with Figure 3 As shown, one end of capacitor C1 is connected to the anode of LED D3, and the other end is connected to the cathode of LED D3, i.e., in parallel with LED D3. Through the filtering effect of capacitor C1, the influence of external interference such as electrostatic voltage on the conduction state of LED D3 can be reduced, ensuring that LED D3 can reliably indicate the power supply status of the field-side power supply P1.

[0047] As for Figure 3 The connection relationships between the other components of the power status indicator circuit in the illustrated embodiment, as well as the specific working process of the power status indicator circuit, can be found in the relevant content of the foregoing embodiments, and will not be repeated here.

[0048] This application also provides another power status indication circuit, see [link to relevant documentation] Figure 4 The power status indication circuit provided in this embodiment also includes an undervoltage monitoring circuit 40.

[0049] Combination Figure 4 As shown, the input terminal of the undervoltage monitoring circuit 40 is connected to the output terminal of the drive circuit 20, receiving either the first drive signal or the second drive signal output by the drive circuit 20. Based on the foregoing, when the sampled voltage is greater than the preset threshold voltage, i.e., when the field-side power supply P1 is in a power-on state, the drive circuit 20 outputs a high level, i.e., the first drive signal. Therefore, this first drive signal can also be used to characterize that the field-side power supply P1 is in a power-on state. Conversely, when the sampled voltage is less than the preset threshold voltage, i.e., when the field-side power supply P1 is not in a power-on state, the drive circuit 20 outputs a low level, i.e., the second drive signal. Therefore, the second drive signal can also be used to characterize that the field-side power supply P1 is not in a power-on state, or is in a power supply abnormal state.

[0050] Based on the above, the undervoltage monitoring circuit 40 responds to the first drive signal by outputting a first monitoring signal indicating that the field-side power supply P1 is functioning normally, or responds to the second drive signal by outputting a second monitoring signal indicating that the field-side power supply P1 is abnormal. The first and second monitoring signals mentioned here can be further output to a host computer for monitoring the operating status of the field-side power supply P1, allowing the host computer to further control the operation of the field-side power supply P1. Alternatively, the first and second monitoring signals can be directly fed back to maintenance personnel, who can then control the operation of the field-side power supply P1 based on the obtained monitoring signals. Of course, other maintenance operations can also be performed based on the first and second monitoring signals, which will not be listed here.

[0051] In summary, the power status indication circuit provided in this embodiment can reliably indicate the power supply status of the field-side power supply, and can further feed back monitoring signals, thereby feeding back the undervoltage information of the field-side power supply to the system side, providing a reference for further operation and maintenance of the field-side power supply.

[0052] This application also provides another power status indication circuit, see [link to relevant documentation] Figure 5 As shown, in the power status indication circuit provided in this embodiment, the undervoltage monitoring circuit 40 includes an optocoupler U2, a fifth resistor R5, and a sixth resistor R6.

[0053] Combination Figure 5 As shown, one end of the fifth resistor R5 serves as the input terminal of the undervoltage monitoring circuit 40 and is connected to the output terminal of the AND gate U1. The other end of the fifth resistor R5 is connected to the control-side input terminal of the optocoupler U2, and the control-side output terminal of the optocoupler U2 is grounded. Furthermore, one end of the sixth resistor R6 receives a preset voltage, and the other end of the sixth resistor R6 is connected to the controlled-side input terminal of the optocoupler U2. The controlled-side output terminal of the optocoupler U2 is grounded, and the connection point between the sixth resistor R6 and the optocoupler U2 serves as the output terminal of the undervoltage monitoring circuit 40 (shown as Out).

[0054] When AND gate U1 outputs a high level, i.e., the first drive signal, optocoupler U2 is turned on, which pulls the potential of the connection point between the sixth resistor R6 and optocoupler U1 down to a low level. Then, the first monitoring signal is output through the output terminal Out to indicate that the field-side power supply P1 is in a normal power supply state.

[0055] When AND gate U1 outputs a low level, i.e. the second drive signal, optocoupler U2 is turned off. Through the pull-up effect of the sixth resistor R6, the connection point between the sixth resistor R6 and optocoupler U1 outputs the aforementioned preset voltage, i.e. the second monitoring signal, to indicate that the power supply P1 on the field side is abnormal, or that it is in an undervoltage operation state.

[0056] In practical applications, the monitoring signal fed back by the undervoltage monitoring circuit is usually fed back to the system side, where it is further processed by the host computer. Therefore, the aforementioned preset voltage should be set in conjunction with the voltage range that the host computer can recognize. For example, it can be set to 3.3V. This will not be elaborated on in detail here. This application does not limit the specific value of the preset voltage.

[0057] In summary, the power status indication circuit and undervoltage monitoring circuit provided in this embodiment are based on optocouplers. They can not only accurately and reliably indicate the power supply status of the field-side power supply without being affected by the power supply status of the system side, but also monitor the undervoltage status of the field-side power supply, thereby achieving isolation between the field side and the system side and ensuring that the operation of the field side and the system side does not affect each other.

[0058] Furthermore, this application also provides a power supply, including a power supply circuit and a power supply status indication circuit provided in any of the foregoing embodiments, wherein, The power supply status indicator circuit is connected to the output terminal of the power supply circuit and is used to indicate the power supply status of the power supply circuit.

[0059] Those skilled in the art will understand that the contents disclosed herein can be varied and modified in many ways. For example, the various devices or components described above can be implemented in hardware, or in software, firmware, or a combination of some or all of the three.

[0060] Furthermore, while this disclosure makes various references to certain elements of systems according to embodiments of this disclosure, any number of different elements may be used and operated on clients and / or servers. Elements are merely illustrative, and different aspects of the system and method may use different elements.

[0061] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms such as those defined in a common dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0062] The foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it. While several exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined by the claims. It should be understood that the foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. A power status indication circuit, characterized in that, include: The verification circuit is connected to the power supply terminal of the field power supply. When the field power supply outputs the power supply voltage, it outputs a high-level signal, or when the field power supply does not output the power supply voltage, it outputs a low-level signal. A driving circuit, connected to the output terminal of the verification circuit, outputs a first driving signal in response to the high-level signal, or outputs a second driving signal in response to the low-level signal; A status indication circuit, connected to the output terminal of the drive circuit, indicates that the field-side power supply is in a power-on state in response to the first drive signal, or indicates that the field-side power supply is not in a power-on state in response to the second drive signal.

2. The power status indication circuit according to claim 1, characterized in that, The verification circuit includes: A sampling circuit, wherein the sampling terminal of the sampling circuit is connected to the power supply terminal of the field-side power supply, and is used to sample the voltage of the power supply terminal and output the corresponding sampling voltage; A comparator circuit, wherein the input terminal of the comparator circuit is connected to the output terminal of the sampling circuit; The comparison circuit is used to compare the magnitude relationship between the sampled voltage and the preset threshold voltage, and outputs the high-level signal when the sampled voltage is greater than the preset threshold voltage, or outputs the low-level signal when the sampled voltage is less than the preset threshold voltage.

3. The power status indication circuit according to claim 2, characterized in that, The sampling circuit includes a first resistor and a second resistor, wherein, One end of the first resistor serves as the sampling terminal of the sampling circuit, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is grounded; The connection point of the first resistor and the second resistor serves as the output terminal of the sampling circuit.

4. The power status indication circuit according to claim 2, characterized in that, The verification circuit further includes: a first Zener diode, wherein... The cathode of the first Zener diode is connected to the input terminal of the comparator circuit, and the anode of the first Zener diode is grounded.

5. The power status indication circuit according to claim 1, characterized in that, The driving circuit includes: a third resistor, a second Zener diode, and an AND gate, wherein... One end of the third resistor is connected to the power supply terminal of the field-side power supply, and the other end of the third resistor is connected to the first input terminal of the AND gate; The cathode of the second Zener diode is connected to the first input terminal of the AND gate, and the anode of the second Zener diode is grounded. The second input terminal of the AND gate is connected to the output terminal of the verification circuit; The output terminal of the AND gate serves as the output terminal of the driving circuit.

6. The power status indication circuit according to claim 1, characterized in that, The status indication circuit includes a fourth resistor and a light-emitting diode, wherein, One end of the fourth resistor is connected to the output terminal of the driving circuit, and the other end of the fourth resistor is connected to the anode of the light-emitting diode, while the cathode of the light-emitting diode is grounded.

7. The power status indication circuit according to claim 6, characterized in that, The status indication circuit further includes: a capacitor, wherein, The capacitor is connected in parallel with the light-emitting diode.

8. The power status indication circuit according to any one of claims 1-7, characterized in that, Also includes: Undervoltage monitoring circuit, in which, The input terminal of the undervoltage monitoring circuit is connected to the output terminal of the drive circuit; In response to the first drive signal, the undervoltage monitoring circuit outputs a first monitoring signal indicating that the field-side power supply is normal; In response to the second drive signal, the undervoltage monitoring circuit outputs a second monitoring signal indicating an abnormal power supply on the field side.

9. The power status indication circuit according to claim 8, characterized in that, The undervoltage monitoring circuit includes: an optocoupler, a fifth resistor, and a sixth resistor, wherein, One end of the fifth resistor serves as the input terminal of the undervoltage monitoring circuit, and the other end of the fifth resistor is connected to the control side input terminal of the optocoupler. The control-side output terminal of the optocoupler is grounded; One end of the sixth resistor receives a preset voltage, and the other end of the sixth resistor is connected to the controlled input terminal of the optocoupler. The controlled-side output terminal of the optocoupler is grounded; The connection point between the sixth resistor and the optocoupler serves as the output terminal of the undervoltage monitoring circuit.

10. A power supply, characterized in that, include: The power supply circuit and the power supply status indication circuit as described in any one of claims 1-9, wherein, The power supply status indicator circuit is connected to the output terminal of the power supply circuit and is used to indicate the power supply status of the power supply circuit.

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