Power supply state monitoring circuit and equipment

Abstract

The utility model relates to the technical field of electronics, and discloses a power supply state monitoring circuit and equipment, and the circuit comprises a power supply maintaining module which is used for carrying out charging based on a main power supply when the main power supply supplies power to a load, and providing standby power for the load when the main power supply is powered down; the power supply switching module is respectively connected with the main power supply, the power supply maintaining module and the load and is used for controlling the power supply maintaining module to supply power to the load when the main power supply is powered down; the threshold setting module is connected with the main power supply and is used for outputting a preset threshold voltage; and the power supply state monitoring module is respectively connected with the threshold value setting module and the load, and is used for receiving the threshold value voltage and obtaining the power supply voltage of the load, and outputting an alarm signal based on a comparison result of the threshold value voltage and the power supply voltage of the load provided by the standby power supply when the main power supply is powered down. The problem that in the prior art, no power supply monitoring circuit capable of setting the power-down threshold value and giving an alarm for the power supply under-voltage condition exists is solved.

Description

Technical Field

[0001] The utility model relates to the field of electronic technology, in particular to a power supply status monitoring circuit and equipment. Background Art

[0002] In the fields of online monitoring, data storage, and dispatching of new energy photovoltaic and energy storage systems, numerous power supply anomalies can significantly impact the normal operation of equipment, such as power loss, data loss, and file loss. Power status monitoring circuits monitor the operating voltage of equipment and, when power anomalies are detected, generate alarms, triggering the device to take appropriate protective measures to avoid serious consequences.

[0003] Currently, there are two common power supply monitoring methods. One uses components such as optocouplers or transistors to detect power outages. While this method is simple and low-cost, it can only qualitatively determine the presence of power and cannot set a power-off threshold, nor can it generate an alarm for undervoltage conditions. The other method uses an op amp or comparator to detect the supply voltage. While this method allows for more flexible setting of the power-off threshold than optocouplers or transistors, it uses more expensive integrated circuits and requires additional integrated circuit protection circuitry, increasing cost and product size.

[0004] In summary, there is no low-cost power monitoring circuit in the prior art that can set a power-off threshold and issue an alarm for a power supply undervoltage condition. Utility Model Content

[0005] In view of this, the present invention provides a power status monitoring circuit and device to solve the problem in the prior art that there is no power monitoring circuit that can set a power-off threshold and issue an alarm for a power supply undervoltage condition.

[0006] In a first aspect, the present invention provides a power supply status monitoring circuit, the circuit comprising:

[0007] A power supply holding module, configured to charge the load based on the main power supply when the main power supply is supplying power to the load, and to provide backup power to the load when the main power supply is powered off;

[0008] a power switching module, the power switching module being connected to the main power supply, the power maintaining module and the load respectively, and being used to control the power maintaining module to supply power to the load when the main power supply fails;

[0009] a threshold setting module, connected to the main power supply and configured to output a preset threshold voltage;

[0010] A power supply status monitoring module, which is connected to the threshold setting module and the load respectively, is used to receive the threshold voltage and obtain the load supply voltage, and when the main power supply fails, outputs an alarm signal based on the comparison result of the threshold voltage and the load supply voltage provided by the backup power.

[0011] The power status monitoring circuit provided by the present invention supplies power to the load through the power maintenance module when the main power supply is cut off, so that the power status monitoring module can output an alarm signal based on the comparison between the load power supply voltage and the threshold voltage, that is, a buffer time is provided for the power status monitoring module to output the alarm signal, thereby realizing the setting of the power-off threshold when monitoring the power status, and issuing an alarm when it is detected that the voltage of the load is lower than the power-off threshold. Moreover, the setting of the power-off threshold voltage and the detection of the main power supply cut-off in the present application are implemented based on the characteristics of the circuit components, without the need for additional integrated chips, thereby greatly reducing the cost.

[0012] In an optional embodiment, the power switching module includes:

[0013] a first diode, wherein a first end of the first diode is connected to the main power supply, a second end of the first diode is connected to the load, and is configured to be turned on when the main power supply is powered;

[0014] a second diode, wherein a first end of the second diode is connected to a second end of the first diode, and a second end of the second diode is connected to the power supply maintaining module, and is configured to be turned on when the main power supply is powered off;

[0015] A first resistor, wherein a first end of the first resistor is connected to the first end of the second diode, and a second end of the first resistor is connected to the second end of the second diode.

[0016] In an optional embodiment, the power supply maintenance module includes:

[0017] A capacitor, a first end of the capacitor is connected to the second end of the second diode, and a second end of the capacitor is grounded.

[0018] In an optional implementation, the threshold setting module includes:

[0019] A step-down unit is connected to the main power supply and the power supply status monitoring module respectively, and is used to step down the voltage of the main power supply and output the voltage as a preset threshold voltage to the power supply status monitoring module.

[0020] In an optional embodiment, the pressure reduction unit includes:

[0021] One or more third diodes are connected in series between the main power supply and the power status monitoring module.

[0022] In an optional embodiment, the power status monitoring module includes:

[0023] A comparison unit, wherein a first input terminal of the comparison unit is connected to the third diode, a second input terminal of the comparison unit is connected to the load, and an output terminal of the comparison unit is connected to the alarm output terminal.

[0024] In an optional implementation, the comparison unit includes:

[0025] a fourth diode, a first end of the fourth diode being connected to the load;

[0026] an optocoupler, wherein a first end of the optocoupler is connected to the first end of the third diode, a second end of the optocoupler is connected to the second end of the fourth diode, a third end of the optocoupler is connected to the alarm output end, and a fourth end of the optocoupler is grounded, and is configured to output an alarm signal based on a comparison result of the threshold voltage and the load supply voltage;

[0027] a second resistor, wherein a first end of the second resistor is connected to the second end of the optocoupler, and a second end of the second resistor is grounded;

[0028] A third resistor, wherein a first end of the third resistor is connected to the third end of the optocoupler, and a second end of the third resistor is connected to a preset reference voltage.

[0029] In an optional implementation, the circuit further includes:

[0030] A power conversion module is connected to the power switching module and the load respectively, and is used to convert and stabilize the received power and then send it to the load.

[0031] In an optional embodiment, the power conversion module includes:

[0032] A DC-DC step-down unit is connected to the power switching module and the load respectively.

[0033] In a second aspect, the present invention provides a power status monitoring device, which includes the power status monitoring circuit of the first aspect and any optional implementation manner thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 This is a structural diagram of a power status monitoring circuit according to an embodiment of the present utility model;

[0036] Figure 2 is a structural diagram of another power status monitoring circuit according to an embodiment of the present utility model;

[0037] Figure 3 This is another structural diagram of a power status monitoring circuit according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0038] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal connections between two components; they may refer to wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Currently, there are two common methods for power supply monitoring. One uses components such as optocouplers or transistors to detect power outages. This method offers simple circuitry and low cost, but it can only qualitatively determine the presence of power and cannot set a power-off threshold, nor can it generate an alarm for undervoltage conditions. The other method uses an op amp or comparator to detect the supply voltage. While this method allows for more flexible setting of the power-off threshold than optocouplers or transistors, it uses more expensive integrated circuits and requires additional integrated circuit protection circuitry, increasing cost and product size. Therefore, a low-cost power supply status monitoring circuit is needed that can set a power-off threshold and generate an alarm for undervoltage conditions.

[0043] In this regard, a power status monitoring circuit is provided in this embodiment, such as Figure 1 As shown, Figure 1 : is a structural diagram of a power status monitoring circuit according to an embodiment of the present utility model, the circuit includes:

[0044] A power supply holding module 10 is configured to charge the load based on the main power supply when the main power supply is supplying power to the load, and to provide backup power to the load when the main power supply is powered off;

[0045] A power switching module 20, the power switching module 20 being connected to the main power supply, the power maintaining module 10 and the load, and being used to control the power maintaining module 10 to supply power to the load when the main power supply fails;

[0046] a threshold setting module 30 , connected to the main power supply and configured to output a preset threshold voltage;

[0047] A power supply status monitoring module 40 is connected to the threshold setting module 30 and the load, respectively, and is used to receive the threshold voltage and obtain the load supply voltage, and when the main power supply fails, output an alarm signal based on the comparison result of the threshold voltage and the load supply voltage provided by the backup power.

[0048] When the power switching module 20 detects that the main power supply has power, it controls the main power supply to supply power to the load. When it detects that the main power supply is powered off or disconnected, it switches the line supplying power to the load, that is, it supplies power to the load through the power maintenance module 10. The threshold setting module 30 generates a threshold voltage based on the voltage of the main power supply after transformation. The power status monitoring module 40 obtains the load supply voltage and the threshold voltage. When the main power supply is normal, the main power supply voltage and the load supply voltage are equal. The power status monitoring module 40 detects that the load supply voltage is greater than the threshold voltage and outputs a high level. The high level indicates that the main power supply is normal. When the main power supply is undervoltage, if the load supply voltage is detected to be lower than the threshold voltage, the module outputs a low level. The low level is an alarm signal that the main power supply is abnormal.

[0049] When the power switching module 20 detects that the main power supply has power, it controls the main power supply to supply power to the load. When it detects that the main power supply is powered off or disconnected, it switches the line that supplies power to the load, that is, it supplies power to the load through the power maintenance module 10. The power maintenance module 10 is also used to enable the power status monitoring module 40 to output an alarm signal when the main power supply is powered off, that is, it provides a buffer time for the power status monitoring module 40 to output the alarm signal. Specifically, when the main power supply is powered off, if there is no power maintenance module 10 to supply power to the load, the threshold voltage received by the power status monitoring module 40 and the load supply voltage are both zero, resulting in the threshold voltage and the load supply voltage being the same and having no difference in high or low, and thus no alarm signal can be output. Therefore, the voltage provided to the load by the power maintenance module 10 can enable the power status monitoring module 40 to detect that the load supply voltage is greater than the threshold voltage, thereby outputting an alarm signal.

[0050] In summary, the power status monitoring circuit of the present application realizes the setting of the power-off threshold and issues an alarm when it detects that the voltage of the load is lower than the power-off threshold. Moreover, the setting of the power-off threshold voltage and the detection of the main power supply power-off in the present application are based on the characteristics of the circuit components, and do not require the addition of additional integrated chips, thereby greatly reducing costs.

[0051] In some optional embodiments, such as Figure 3 As shown, Figure 3 FIG. 2 is another structure diagram of a power state monitoring circuit according to an embodiment of the present utility model. The power switching module 20 includes:

[0052] a first diode D1, wherein a first end of the first diode D1 is connected to the main power supply, and a second end of the first diode D1 is connected to the load, and is used to control the main power supply to supply power to the load;

[0053] a second diode D2, wherein a first end of the second diode D2 is connected to the second end of the first diode D1, and a second end of the second diode D2 is connected to the power supply maintaining module 10, and is used to control the power supply maintaining module 10 to supply power to the load when the main power supply is lost;

[0054] A first resistor R1 , wherein a first end of the first resistor R1 is connected to a first end of the second diode D2 , and a second end of the first resistor R1 is connected to a second end of the second diode D2 .

[0055] When the main power supply is functioning normally, the first diode D1 is turned on, and current flows out of the main power supply, passes through the first diode D1, and supplies power to the load. Simultaneously, the first resistor R1 charges the power supply maintenance module 10. When the main power supply is disconnected, the first diode D1 is turned off, and current flows out of the power supply maintenance module 10, passes through the second diode D2, and supplies power to the load. This also provides a buffer for the power supply status monitoring module 40 to output an alarm signal.

[0056] In some optional embodiments, such as Figure 3 As shown, the power supply maintaining module 10 includes:

[0057] A capacitor C1 , wherein a first end of the capacitor C1 is connected to a second end of the second diode D2 , and a second end of the capacitor C1 is grounded.

[0058] When the main power supply is normally supplied, the main power supply charges the capacitor through the first diode D1 and the first resistor R1. When the main power supply is disconnected, the capacitor C1 uses the stored energy to supply power to the load through the second diode D2.

[0059] In some optional embodiments, such as Figure 2 As shown, Figure 2 FIG. 1 is another power state monitoring circuit structure diagram according to an embodiment of the present utility model, wherein the threshold setting module 30 includes:

[0060] The step-down unit 31 is connected to the main power supply and the power status monitoring module 40 respectively, and is used to step down the voltage of the main power supply and output it as a preset threshold voltage to the power status monitoring module 40.

[0061] The voltage reduction unit 31 reduces the voltage of the main power supply to a preset threshold voltage, so that the power supply status monitoring module 40 outputs an alarm signal when detecting that the load power supply voltage is lower than the threshold voltage.

[0062] In some optional embodiments, such as Figure 3 As shown, the step-down unit 31 includes:

[0063] One or more third diodes D3 , wherein the third diodes D3 are connected in series between the main power supply and the power status monitoring module 40 .

[0064] In this embodiment, the threshold setting module 30 may include only one third diode D3, the anode of the third diode D3 is connected to the main power supply, and the cathode of the third diode D3 is connected to the power status monitoring module 40. The threshold setting module 30 may also include multiple third diodes D3, and the third diodes D3 are connected in series as a series connection group, the first end of the series connection group is connected to the main power supply, and the second end of the series connection group is connected to the power status monitoring module 40.

[0065] The third diodes D3 act as voltage droppers, thereby providing a threshold voltage for the power status monitoring module 40. In practical applications, the voltage drop across each third diode D3 is approximately 0.7V. The voltage Va across the third diodes D3 is Va = Vin - n * 0.7V, where n is the number of third diodes D3. The alarm threshold voltage for power status detection can be adjusted by adjusting the number of third diodes D3.

[0066] In some optional embodiments, such as Figure 2 As shown, the power status monitoring module 40 includes:

[0067] The comparison unit 41 has a first input terminal connected to the third diode D3 , a second input terminal connected to the load, and an output terminal connected to the alarm output terminal Powerstate.

[0068] The first input terminal of the comparison unit receives a preset threshold voltage, and the second input terminal of the comparison unit receives a load power supply voltage. After comparing the threshold voltage and the load power supply voltage, the comparison unit outputs the comparison result to the alarm output terminal Power state.

[0069] In some optional embodiments, such as Figure 3 As shown, the comparison unit 41 includes:

[0070] a fourth diode D4, wherein a first end of the fourth diode D4 is connected to the load;

[0071] an optocoupler U1, wherein a first end of the optocoupler U1 is connected to a first end of the third diode D3, a second end of the optocoupler U1 is connected to a second end of the fourth diode D4, a third end of the optocoupler U1 is connected to an alarm output end Powerstate, and a fourth end of the optocoupler U1 is grounded, and is configured to output an alarm signal based on a comparison result between the threshold voltage and the load power supply voltage;

[0072] A second resistor R2, the first end of the second resistor R2 is connected to the second end of the optocoupler U1, and the second end of the second resistor R2 is grounded;

[0073] A third resistor R3, the first end of the third resistor R3 is connected to the third end of the optocoupler U1, and the second end of the third resistor R3 is connected to a preset reference voltage VCC.

[0074] The fourth diode D4 and the diode inside the optocoupler U1 form an "OR" logic circuit. As Figure 3 shown, when Va < Vb, the fourth diode D4 in the Vb branch conducts, and the diode inside the optocoupler in the Va branch is turned off. The output of the optocoupler U1 is pulled up by the third resistor R3, and PowerState outputs a high-level power state alarm signal; when Va > Vb, the fourth diode D4 in the Vb branch is turned off, and the diode inside the optocoupler in the Va branch conducts, and the output of the optocoupler U1 is pulled down, and PowerState outputs a low-level normal power state signal. In the above, Va = Vin - n * 0.7V, Vb = Vout, and the power state alarm threshold is Va = Vb. After derivation, the threshold is obtained as Vin = Vout + n * 0.7V.

[0075] In some optional embodiments, as Figure 1 shown, the power state monitoring circuit further includes:

[0076] A power conversion module 50, the power conversion module 50 is respectively connected to the power switching module 20 and the load, and is used to convert and regulate the received power and then send it to the load.

[0077] The power conversion module 50 is used to perform DC conversion and voltage regulation on the power provided by the line switched by the power switching module 20 and then output it to the load. It should be noted that the power state monitoring module 40 can obtain the load supply voltage from the power conversion module 50, or directly obtain the load supply voltage from the load. The load includes a voltage regulation unit inside, and the voltage regulation unit regulates the voltage provided to the load, so as to provide a stabilized voltage to the power state monitoring module 40.

[0078] In some feasible embodiments, as Figure 3 shown, the power conversion module 50 includes:

[0079] A DC-DC buck unit, the DC-DC buck unit is respectively connected to the power switching module 20 and the load.

[0080] The DC-DC step-down unit is used to step down the power provided by the line switched by the power switching module 20, provide a stable voltage to the load, and at the same time, provide it as a reference voltage to the power status monitoring module 40 for comparison and output of an alarm signal.

[0081] In this embodiment, the utility model provides a power status monitoring device, which includes the power status monitoring circuit and the main power supply as described above. The power supply maintenance module supplies power to the load when the main power supply is powered off, so that the power status monitoring module can output an alarm signal based on the comparison between the load supply voltage and the threshold voltage, that is, a buffer time is provided for the power status monitoring module to output the alarm signal, thereby achieving the setting of the power-off threshold when monitoring the power status, and issuing an alarm when it is detected that the voltage of the load is lower than the power-off threshold. In addition, the setting of the power-off threshold voltage and the detection of the main power supply power-off in this application are based on the characteristics of the circuit components, and no additional integrated chip is required, thereby greatly reducing the cost.

[0082] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A power status monitoring circuit, characterized in that: The circuit comprises: A power supply holding module, configured to charge the load based on the main power supply when the main power supply is supplying power to the load, and to provide backup power to the load when the main power supply is powered off; a power switching module, the power switching module being connected to the main power supply, the power maintaining module and the load respectively, and being used to control the power maintaining module to supply power to the load when the main power supply fails; a threshold setting module, connected to the main power supply and configured to output a preset threshold voltage; A power supply status monitoring module, which is connected to the threshold setting module and the load respectively, is used to receive the threshold voltage and obtain the load supply voltage, and when the main power supply fails, outputs an alarm signal based on the comparison result of the threshold voltage and the load supply voltage provided by the backup power.

2. The circuit according to claim 1, wherein: The power switching module includes: a first diode, wherein a first end of the first diode is connected to the main power supply, a second end of the first diode is connected to the load, and is configured to be turned on when the main power supply is powered; a second diode, wherein a first end of the second diode is connected to a second end of the first diode, and a second end of the second diode is connected to the power supply maintaining module, and is configured to be turned on when the main power supply is powered off; A first resistor, wherein a first end of the first resistor is connected to the first end of the second diode, and a second end of the first resistor is connected to the second end of the second diode.

3. The circuit according to claim 2, characterized in that The power supply maintenance module includes: A capacitor, a first end of the capacitor is connected to the second end of the second diode, and a second end of the capacitor is grounded.

4. The circuit according to claim 3, characterized in that The threshold setting module includes: A step-down unit is connected to the main power supply and the power supply status monitoring module respectively, and is used to step down the voltage of the main power supply and output the voltage as a preset threshold voltage to the power supply status monitoring module.

5. The circuit according to claim 4, characterized in that The step-down unit comprises: One or more third diodes are connected in series between the main power supply and the power status monitoring module.

6. The circuit according to claim 5, characterized in that The power status monitoring module includes: A comparison unit, wherein a first input terminal of the comparison unit is connected to the third diode, a second input terminal of the comparison unit is connected to the load, and an output terminal of the comparison unit is connected to the alarm output terminal.

7. The circuit according to claim 6, characterized in that The comparison unit includes: a fourth diode, a first end of the fourth diode being connected to the load; an optocoupler, wherein a first end of the optocoupler is connected to the first end of the third diode, a second end of the optocoupler is connected to the second end of the fourth diode, a third end of the optocoupler is connected to the alarm output end, and a fourth end of the optocoupler is grounded, and is configured to output an alarm signal based on a comparison result of the threshold voltage and the load supply voltage; a second resistor, wherein a first end of the second resistor is connected to the second end of the optocoupler, and a second end of the second resistor is grounded; A third resistor, wherein a first end of the third resistor is connected to the third end of the optocoupler, and a second end of the third resistor is connected to a preset reference voltage.

8. The circuit according to claim 5, characterized in that The circuit further comprises: A power conversion module is connected to the power switching module and the load respectively, and is used to convert and stabilize the received power and then send it to the load.

9. The circuit according to claim 8, characterized in that The power conversion module includes: A DC-DC step-down unit is connected to the power switching module and the load respectively.

10. A power status monitoring device, characterized in that: The power supply status monitoring device comprises the power supply status monitoring circuit according to any one of claims 1 to 9.

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