Holding circuit and charging device
By using a "fast-amplifier" circuit with diodes and capacitors in parallel and impedance protection, combined with optocoupler monitoring, the problem of power-down signal delay is solved, data stability and integrity are improved, the risk of component damage is reduced, and the monitoring and historical recording of the power supply process of the power module are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU ENERGY TECH CO LTD
- Filing Date
- 2025-03-14
- Publication Date
- 2026-04-21
AI Technical Summary
In existing power-down retention solutions, the voltage detection response speed is insufficient, resulting in a delay in the power-down signal and affecting data stability and integrity.
The "fast discharge" circuit, which uses a diode and capacitor in parallel, achieves rapid discharge by storing energy in the capacitor. An impedance element is connected in series in the diode branch to limit the current. Combined with an optocoupler to monitor the input of the power module to detect abnormalities and record historical power outage records.
It improves discharge efficiency, reduces the risk of diode damage, enhances data stability and integrity, and enables monitoring and historical record reference of the power supply process of the power module.
Smart Images
Figure CN224153984U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of control circuit technology, and more specifically, to a holding circuit and a charging device. Background Technology
[0002] With the widespread use of electronic devices, power supply stability has become a key factor in ensuring data integrity and system reliability. In fields such as industrial control, communication equipment, and IoT terminals, sudden power outages can lead to data loss or transmission interruptions.
[0003] Currently, common power-down retention solutions use a DC-DC power supply circuit to charge the retention capacitor and then discharge the capacitor during power failure by detecting the voltage. For example, the power failure state is determined by detecting the voltage at the main circuit power input terminal, and the capacitor's energy storage is used to maintain the output voltage.
[0004] However, such solutions often suffer from insufficient response speed in the detection circuitry, leading to a delay in the power-down signal. Consequently, the process of maintaining power to the load through capacitor discharge is also delayed, ultimately affecting the stability and integrity of the data. Utility Model Content
[0005] The purpose of this application is to provide a holding circuit and charging device, which uses a "fast discharge" circuit formed by a parallel design of diodes and capacitors to improve discharge efficiency, thereby improving the stability and integrity of data in the load.
[0006] In a first aspect, this application provides a holding circuit, including a power-down holding module; the power-down holding module includes a first capacitor and a first diode; a first terminal of the first capacitor is connected to the anode of the first diode, and a second terminal of the first capacitor is connected to the cathode of the first diode; the first terminal of the first capacitor is also used to connect to a low-potential output terminal of a power supply module, and the second terminal of the first capacitor is also used to connect to a high-potential output terminal of the power supply module; wherein the low-potential output terminal and the high-potential output terminal of the power supply module are respectively connected to a load.
[0007] In the aforementioned holding circuit, when the power module is normally supplying power to the load, the first capacitor and the first diode are connected in parallel at the two output terminals of the power module. Therefore, the first diode is in the off state, and current flows through the branch containing the first capacitor to charge it. In the event of an anomaly during the power supply process, the charge stored in the first capacitor can be discharged to the two output terminals of the power module immediately. This achieves both maintaining power to the load and rapid discharge of the holding circuit, thereby improving discharge efficiency and ultimately enhancing the stability and integrity of data within the load.
[0008] In conjunction with the first aspect, optionally, the power-down retention module further includes a first impedance element; the first connection terminal of the first impedance element is connected to the cathode of the first diode, and the second connection terminal of the first impedance element is connected to the second connection terminal of the first capacitor.
[0009] The aforementioned holding circuit limits the current in the branch containing the first diode by connecting a first impedance element in series with the branch containing the first diode, thereby reducing the risk of damage to the first diode due to excessive current in that branch.
[0010] In conjunction with the first aspect, optionally, the power-down retention module further includes a second capacitor and a second diode; a first terminal of the second capacitor is connected to the anode of the second diode, and a second terminal of the second capacitor is connected to the cathode of the second diode; the second terminal of the second capacitor is also used to connect to the high potential output terminal of the power supply module.
[0011] The aforementioned holding circuit, through the series connection of the first and second capacitors, not only increases the capacitance of the power-down holding module but also improves the withstand voltage of the entire power-down holding module. This further enhances the discharge efficiency and the stability of the holding circuit.
[0012] In conjunction with the first aspect, optionally, the power-down retention module further includes a third diode and a third impedance element; the anode of the third diode is connected to the second terminal of the first capacitor, and the cathode of the third diode is used to connect to the high potential output terminal of the power module; the first connection terminal of the third impedance element is connected to the anode of the third diode, and the second connection terminal of the third impedance element is connected to the cathode of the third diode.
[0013] The aforementioned holding circuit limits the current flowing through the branch containing the third impedance element only when the power module is normally supplying power to the load, i.e., during capacitor charging. This protects the capacitor by restricting the current during charging. Furthermore, the third diode only conducts during capacitor discharge, enabling rapid discharge of the power-down holding module. Ultimately, this further improves discharge efficiency, thus enhancing the stability and integrity of data within the load.
[0014] In conjunction with the first aspect, optionally, the circuit further includes a power-down detection module; the power-down detection module includes an optocoupler and a fourth impedance element; the first input terminal of the optocoupler is used to connect to the first input terminal of the power module, and the second input terminal of the optocoupler is used to connect to the second input terminal of the power module; the collector of the optocoupler is connected to the first connection terminal of the fourth impedance element, and the emitter of the optocoupler is grounded; the second connection terminal of the fourth impedance element is connected to the high potential terminal of the external power supply; the first connection terminal of the fourth impedance element is also used to connect to the signal input terminal of the controller.
[0015] The aforementioned holding circuit uses an optocoupler to monitor whether AC power is being normally input to the first and second input terminals of the power module. This allows the first connection terminal of the fourth impedance element to output a high or low level, so that the controller can determine and record any abnormalities that occur during the power module's supply of power to the load. This enables monitoring of the power module's supply of power to the load and allows for the recording of historical power outages during the power supply process, which can be used as a reference for later circuit modifications.
[0016] In conjunction with the first aspect, optionally, the power failure detection module further includes a sixth impedance element; the first connection terminal of the sixth impedance element is connected to the first input terminal of the optocoupler, and the second connection terminal of the sixth impedance element is connected to the second input terminal of the optocoupler.
[0017] The aforementioned holding circuit, by connecting a sixth impedance element in parallel between the two input terminals of the optocoupler, allows a portion of the current to be diverted when the power module is normally supplying power to the load, thereby protecting the optocoupler from damage by excessive current.
[0018] In conjunction with the first aspect, optionally, the power failure detection module further includes a seventh impedance element and an eighth impedance element; the first input terminal of the optocoupler is used to connect to the first input terminal of the power module through the seventh impedance element, and the second input terminal of the optocoupler is used to connect to the second input terminal of the power module through the eighth impedance element.
[0019] The aforementioned holding circuit, by connecting the seventh and eighth impedance elements in series at the two input terminals of the optocoupler, also serves as a voltage divider, thereby preventing the optocoupler and other components from being damaged by excessive voltage.
[0020] In conjunction with the first aspect, optionally, the power failure detection module further includes a third capacitor; the first connection terminal of the third capacitor is connected to the first connection terminal of the fourth impedance element, and the second connection terminal of the third capacitor is grounded.
[0021] In the aforementioned holding circuit, the first connection terminal of the fourth impedance element serves as the signal output terminal connected to the signal input terminal of the external controller. By grounding it through the third capacitor, it plays a filtering role, reducing high-frequency noise or voltage fluctuations in the signal output terminal, thus making the signal output terminal smoother.
[0022] In conjunction with the first aspect, optionally, the power failure detection module further includes a fifth impedance element; the first connection terminal of the fifth impedance element is connected to the first connection terminal of the fourth impedance element, and the second connection terminal of the fifth impedance element is connected to the first connection terminal of the third capacitor.
[0023] In the aforementioned holding circuit, the fifth impedance element can be used as a pull-up resistor or a pull-up inductor, so that the signal output can be kept at a high level when the optocoupler output is not driven, thereby further improving the clarity of whether the output signal is a high-level signal or a low-level signal.
[0024] In a second aspect, this application provides a charging device including a holding circuit as described in the first aspect.
[0025] The above-described charging device has the same beneficial effects as the first aspect or any optional embodiment of the first aspect, and will not be repeated here.
[0026] In summary, the holding circuit and charging device provided in this application, through the "fast discharge" circuit formed by the parallel design of diodes and capacitors, improves the discharge efficiency, thereby enhancing the stability and integrity of data in the load. By connecting a first impedance element in series in the branch where the first diode is located, the current in the branch where the first diode is located is limited, thus reducing the risk of damage to the first diode due to excessive current in this branch. By connecting a second capacitor in series on top of the first capacitor, the capacitance of the power-down holding module is increased, as well as the withstand voltage of the entire power-down holding module. This further improves the discharge efficiency and the stability of the holding circuit. Optical couplers are used to monitor whether the first and second input terminals of the power module are receiving AC power normally, so that the controller can judge and record any abnormalities that occur during the power supply process of the power module to the load. This achieves monitoring of the power supply process of the power module to the load, and the historical power-down records during this power supply process can be used for reference during later circuit rectification. The first connection terminal of the fourth impedance element serves as the signal output terminal connected to the signal input terminal of the external controller. Grounding it through the third capacitor acts as a filter, reducing high-frequency noise or voltage fluctuations in the signal output terminal, making the signal output smoother. Attached Figure Description
[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of a first circuit structure of the holding circuit provided in an embodiment of this application;
[0029] Figure 2 This is a schematic diagram of a second circuit structure for the holding circuit provided in an embodiment of this application;
[0030] Figure 3 This is a schematic diagram of a third circuit structure for the holding circuit provided in an embodiment of this application;
[0031] Figure 4 This is a schematic diagram of a fourth circuit structure for the holding circuit provided in an embodiment of this application.
[0032] Icons: 100, Holding circuit; 110, Electrical holding module; C1, First capacitor; D1, First diode; R1, First impedance element; C2, Second capacitor; D2, Second diode; R2, Second impedance element; D3, Third diode; R3, Third impedance element; 120, Power failure detection module; U, Optocoupler; R4, Fourth impedance element; R5, Fifth impedance element; R6, Sixth impedance element; R7, Seventh impedance element; R8, Eighth impedance element; C3, Third capacitor; 200, Power supply module; 300, Load. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.
[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0039] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a first circuit structure of the holding circuit 100 provided in this application embodiment. The holding circuit 100 provided in this application embodiment may include a power-down holding module 110. The power-down holding module 110 may include a first capacitor C1 and a first diode D1. The first terminal of the first capacitor C1 may be connected to the anode of the first diode D1, and the second terminal of the first capacitor C1 may be connected to the cathode of the first diode D1. The first terminal of the first capacitor C1 may also be used to connect to the low potential output terminal of the power supply module 200, and the second terminal of the first capacitor C1 may also be used to connect to the high potential output terminal of the power supply module 200. The low potential output terminal and the high potential output terminal of the power supply module 200 may be connected to the load 300 respectively.
[0040] The power module 200 may be equipped with an AC-DC conversion unit to convert alternating current (AC) to direct current (DC) and output it to the load 300. Therefore, the low-potential output terminal and high-potential output terminal of the power module 200 can be the negative and positive output terminals of the power output module, respectively. Alternatively, the low-potential output terminal of the power module 200 can be grounded, meaning its potential is 0, and the high-potential output terminal of the power module 200 can have a potential of +5V.
[0041] In the above implementation process, when the power module 200 is normally supplying power to the load 300, since the first capacitor C1 and the first diode D1 are connected in parallel at the two output terminals of the power module 200, the first diode D1 is in the off state, and current flows through the branch containing the first capacitor C1 to charge the capacitor. In the event of an abnormality during the power supply process from the power module 200 to the load 300, the charge stored in the first capacitor C1 can be discharged to the two output terminals of the power module 200 immediately. This achieves not only maintaining the power supply to the load 300 but also enabling rapid discharge of the holding circuit 100, thereby improving discharge efficiency and ultimately enhancing the stability and integrity of the data in the load 300.
[0042] Please refer to Figure 2 , Figure 2 This is a schematic diagram of a second circuit structure of the holding circuit 100 provided in this application embodiment. In some optional embodiments, the power-down holding module 110 may further include a first impedance element R1. The first connection terminal of the first impedance element R1 may be connected to the cathode of the first diode D1, and the second connection terminal of the first impedance element R1 may be connected to the second connection terminal of the first capacitor C1.
[0043] The first impedance element R1 can be an inductor or a resistor, which can limit the current in the branch where the first diode D1 is located, thereby protecting the first diode D1.
[0044] In the above implementation process, by connecting the first impedance element R1 in series in the branch where the first diode D1 is located, the current in the branch where the first diode D1 is located is limited, thereby reducing the risk of damage to the first diode D1 due to excessive current in the branch.
[0045] Please continue to refer to Figure 2 In some optional embodiments, the power-down retention module 110 may further include a second capacitor C2 and a second diode D2. A first terminal of the second capacitor C2 may be connected to the anode of the second diode D2, and a second terminal of the second capacitor C2 may be connected to the cathode of the second diode D2. The second terminal of the second capacitor C2 may also be connected to the high-potential output terminal of the power supply module 200.
[0046] In other words, the first capacitor C1 and the second capacitor C2 are connected in series, and the first diode D1 and the second diode D2 are also connected in parallel to the first capacitor C1 and the second capacitor C2, respectively.
[0047] As an optional implementation, based on the previous embodiments, the branch containing the second diode D2 can also be connected in series with a second impedance element R2, which can specifically be an inductor or a resistor. The function of the second impedance element R2 can be the same as that of the first impedance element R1.
[0048] It is worth mentioning that, based on the embodiments of this application, the power-down retention module 110 can also be connected in series with a third capacitor C3, a fourth capacitor, etc. Furthermore, the third capacitor C3 can be connected in parallel with a corresponding diode, and the fourth capacitor can also be connected in parallel with a diode.
[0049] In the above implementation process, the series connection of the first capacitor C1 and the second capacitor C2 increases the withstand voltage of the entire power-down retention module 110. This further improves the discharge efficiency and the stability of the retention circuit 100.
[0050] Please continue to refer to Figure 2 In some optional embodiments, the power-down retention module 110 may further include a third diode D3 and a third impedance element R3. The anode of the third diode D3 may be connected to the second terminal of the first capacitor C1, and the cathode of the third diode D3 may be connected to the high-potential output terminal of the power supply module 200. The first connection terminal of the third impedance element R3 may be connected to the anode of the third diode D3, and the second connection terminal of the third impedance element R3 may be connected to the cathode of the third diode D3.
[0051] In other words, a third diode D3 is connected in series in the branch containing the first capacitor C1 and the second capacitor C2, and a third impedance element R3 is connected in parallel with the third diode D3. The third impedance element R3 can also be an inductor or a resistor.
[0052] When the power module 200 is normally supplying power to the load 300, since the third diode D3 is also in the off state, the current flows through the branch containing the third impedance element R3 to the first capacitor C1 (if the power-down retention module 110 includes the second capacitor C2, the current flows through the branch containing the third impedance element R3 to the branch containing the first capacitor C1 and the second capacitor C2) to charge the first capacitor C1 (if the power-down retention module 110 includes the second capacitor C2, then it charges both the first capacitor C1 and the second capacitor C2). If an abnormality occurs during the power supply process from the power module 200 to the load 300, the third diode D3 is in the on state, and the third impedance element R3 is short-circuited by the third diode D3. The first capacitor C1 (or, the first capacitor C1 and the second capacitor C2) discharges through the branch containing the third diode D3 to the two output terminals of the power module 200.
[0053] In the above implementation process, since the power module 200 is normally supplying power to the load 300, that is, during the charging process of the capacitor, the current only flows through the branch containing the third impedance element R3, thus limiting the current during the charging process of the capacitor and protecting the capacitor. Furthermore, the third diode D3 only conducts during the capacitor's discharge process, thereby enabling rapid discharge of the power-down retention module 110. Ultimately, this further improves the discharge efficiency, which in turn further enhances the stability and integrity of the data in the load 300.
[0054] Please refer to Figure 3 , Figure 3 This is a schematic diagram of a third circuit structure of the holding circuit 100 provided in this application embodiment. In some optional embodiments, the circuit may further include a power-down judgment module 120. The power-down judgment module 120 may include an optocoupler U and a fourth impedance element R4. The first input terminal of the optocoupler U can be used to connect to the first input terminal of the power module 200, and the second input terminal of the optocoupler U can be used to connect to the second input terminal of the power module 200. The collector of the optocoupler U can be connected to the first connection terminal of the fourth impedance element R4, and the emitter of the optocoupler U is grounded. The second connection terminal of the fourth impedance element R4 can be connected to the high potential terminal of the external power supply. The first connection terminal of the fourth impedance element R4 can also be used to connect to the signal input terminal of the controller.
[0055] Based on the AC-DC conversion unit configured within the power module 200 described above, the first input terminal and the second input source of the power module 200 can be the live wire and neutral wire of AC power, respectively. The optocoupler U typically contains a light-emitting diode (LED) and a phototransistor, and the LED can be coupled to the phototransistor. In this embodiment, since the input to the optocoupler U is AC power, the optocoupler U can contain two LEDs connected in parallel with opposite directions, so that regardless of the current direction, one LED can conduct and emit light.
[0056] The second connection terminal of the fourth impedance element R4 can be connected to the positive terminal of an external power supply, such as a 3.3V DC power supply, so that the potential of the second connection terminal of the fourth impedance element R4 is +3.3V.
[0057] When the power module 200 is normally supplying power to the load 300, the power failure detection module 120 can also normally input AC power, and the LED inside the optocoupler U can conduct and emit light. In this case, the collector and emitter of the phototransistor are in a conducting state, and the signal input terminal of the controller is usually a high-level signal. Conversely, if an abnormality occurs during the power supply process from the power module 200 to the load 300, the LED inside the optocoupler U cannot conduct and emit light. In this case, the collector and emitter of the phototransistor are in a cutoff state, and the signal input terminal of the controller is usually a low-level signal. Therefore, the controller can determine whether an abnormality has occurred during the power supply process from the power module 200 to the load 300 based on whether the input signal is high-level or low-level.
[0058] In the above implementation process, the optocoupler U is used to monitor whether the first input terminal and the second input terminal of the power module 200 are normally input with AC power, so that the first connection terminal of the fourth impedance element R4 outputs a high level or a low level, so that the controller and other components can judge and record any abnormalities that occur during the process of the power module 200 supplying power to the load 300. This realizes the monitoring of the process of the power module 200 supplying power to the load 300, and the historical power failure records during the power supply process can be recorded for reference when rectifying the circuit later.
[0059] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the fourth circuit structure of the holding circuit 100 provided in the embodiments of this application. In some optional embodiments, the power-down judgment module 120 may further include a sixth impedance element R6. The first connection terminal of the sixth impedance element R6 may be connected to the first input terminal of the optocoupler U, and the second connection terminal of the sixth impedance element R6 may be connected to the second input terminal of the optocoupler U.
[0060] In other words, a sixth impedance element R6 is connected in parallel between the two input terminals of the optocoupler U. The sixth impedance element R6 can also be a resistor or an inductor.
[0061] In the above implementation process, by connecting the sixth impedance element R6 in parallel between the two input terminals of the optocoupler U, a portion of the current is shared when the power module 200 is normally supplying power to the load 300, thereby protecting the optocoupler U from damage by excessive current.
[0062] Please continue to refer to Figure 4 In some optional embodiments, the power failure detection module 120 may further include a seventh impedance element R7 and an eighth impedance element R8. The first input terminal of the optocoupler U can be connected to the first input terminal of the power module 200 through the seventh impedance element R7, and the second input terminal of the optocoupler U can be connected to the second input terminal of the power module 200 through the eighth impedance element R8.
[0063] In other words, the seventh impedance element R7 and the eighth impedance element R8 are connected in series at the two input terminals of the optocoupler U. The seventh impedance element R7 and the eighth impedance element R8 can also be resistors or inductors, respectively.
[0064] In the above implementation process, the seventh impedance element R7 and the eighth impedance element R8 are connected in series on the two input terminals of the optocoupler U, which also serves as a voltage divider, thereby preventing the optocoupler U and other components from being damaged by excessive voltage.
[0065] Please continue to refer to Figure 4 In some optional embodiments, the power failure detection module 120 may further include a third capacitor C3. The first connection terminal of the third capacitor C3 may be connected to the first connection terminal of the fourth impedance element R4, and the second connection terminal of the third capacitor C3 may be grounded.
[0066] In the above implementation process, the first connection terminal of the fourth impedance element R4 serves as the signal output terminal connected to the signal input terminal of the external controller. It is grounded through the third capacitor C3, which plays a filtering role, reducing high-frequency noise or voltage fluctuations in the signal output terminal, making the signal output terminal smoother.
[0067] Please continue to refer to Figure 4 In some optional embodiments, the power failure detection module 120 may further include a fifth impedance element R5. The first connection terminal of the fifth impedance element R5 may be connected to the first connection terminal of the fourth impedance element R4, and the second connection terminal of the fifth impedance element R5 may be connected to the first connection terminal of the third capacitor C3.
[0068] In other words, a fifth impedance element R5 is connected in series at the signal output terminal. Specifically, the fifth impedance element R5 can be a resistor or an inductor.
[0069] In the above implementation process, the fifth impedance element R5 can be used as a pull-up resistor or pull-up inductor, so that the signal output terminal can be kept at a high level when the output terminal of optocoupler U is not driven, thereby further improving the clarity of whether the output level signal is a high level signal or a low level signal.
[0070] In summary, within a given range of values, the capacitance decreases when capacitors are connected in series. The calculation formula is as follows:
[0071]
[0072] In the formula, C1 is the capacitance of the first capacitor C1, C2 is the capacitance of the second capacitor C2, and C is the capacitance of the first capacitor C1 and the second capacitor C2 connected in series.
[0073] Given a specific value, the capacitance of capacitors connected in series decreases, but the voltage rating of the capacitors increases. The calculation formula is as follows:
[0074] C V =C V1 +C V2 ;
[0075] In the formula, C v1 Let C be the voltage rating of the first capacitor C1. v2 The voltage rating of the second capacitor C2 is C. v This is the withstand voltage value of the first capacitor C1 and the second capacitor C2 connected in series.
[0076] The power outage period, which is the time when the capacitor supplies power to the load, is calculated using the following formula for the DC power of the load:
[0077] P = UI
[0078] In the formula, P is the DC power of the load, U is the voltage across the load, and I is the current flowing through the load.
[0079] The capacitor discharge time is related to the output power of each capacitor, and its calculation formula is as follows:
[0080]
[0081] In the formula, ΔT is the discharge time, U1 is the voltage across the first capacitor C1, U2 is the voltage across the second capacitor C2, and P is the DC power of the load.
[0082] The test power supply characteristics are as follows: the voltage across the capacitor after it is fully charged is 5.3V; the designed output voltage and current of the load are 3.3V and 0.4A respectively, with a voltage drop of 0.3V; the selection parameters for the first and second capacitors are 2F / 2.7V respectively; when the input terminal loses power due to a sudden cause, the power supply must maintain normal operation at 3.3V for at least 4 seconds; the calculated time ΔT is as follows:
[0083]
[0084] The test results show that when the input is powered off, the output voltage can continue to work for at least 4 seconds under the support of the holding capacitor, which can maintain the normal data upload to the platform.
[0085] Based on the same concept, embodiments of this application provide a charging device that may include the holding circuit 100 described above.
[0086] The aforementioned charging devices can specifically include charging piles, industrial-grade charging equipment, and intelligent clamp charging sockets, etc.
[0087] The above implementation process can be the same as the holding circuit described above, and will not be repeated here.
[0088] In summary, the holding circuit 100 and charging device provided in the various embodiments of this application, through the "fast discharge" circuit formed by the parallel design of diodes and capacitors, improve discharge efficiency, thereby improving the stability and integrity of data in the load 300. By connecting the first impedance element R1 in series with the branch where the first diode D1 is located, the current in the branch where the first diode D1 is located is limited, thereby reducing the risk of damage to the first diode D1 due to excessive current in this branch. By connecting the second capacitor C2 in series with the first capacitor C1, the capacitance of the power-down holding module 110 is increased, and the withstand voltage of the entire power-down holding module 110 is also increased. This further improves the discharge efficiency and the stability of the holding circuit 100. The optocoupler U is used to monitor whether the first input terminal and the second input terminal of the power module 200 are normally input with AC power, so that the controller and other devices can judge and record any abnormalities that occur during the process of the power module 200 supplying power to the load 300. This realizes the monitoring of the process of the power module 200 supplying power to the load 300, and the historical power-down records during the power supply process can be used for reference during later circuit rectification. The first connection terminal of the fourth impedance element R4 serves as the signal output terminal connected to the signal input terminal of the external controller. It is grounded through the third capacitor C3, which plays a filtering role, reducing high-frequency noise or voltage fluctuations in the signal output terminal, making the signal output terminal smoother.
[0089] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A holding circuit, characterized by, Including a power-loss retention module; The power-down retention module includes a first capacitor and a first diode; The first terminal of the first capacitor is connected to the anode of the first diode, and the second terminal of the first capacitor is connected to the cathode of the first diode. The first end of the first capacitor is also used to connect to the low potential output terminal of the power module, and the second end of the first capacitor is also used to connect to the high potential output terminal of the power module; wherein the low potential output terminal and the high potential output terminal of the power module are respectively connected to the load.
2. The holding circuit according to claim 1, characterized in that The power-down retention module also includes a first impedance element; The first connection terminal of the first impedance element is connected to the cathode of the first diode, and the second connection terminal of the first impedance element is connected to the second connection terminal of the first capacitor.
3. The holding circuit according to claim 1, characterized in that, The power-down retention module also includes a second capacitor and a second diode; The first terminal of the second capacitor is connected to the anode of the second diode, and the second terminal of the second capacitor is connected to the cathode of the second diode; The second terminal of the second capacitor is also used to connect to the high potential output terminal of the power module.
4. The holding circuit according to claim 1, characterized in that, The power-down retention module also includes a third diode and a third impedance element; The anode of the third diode is connected to the second terminal of the first capacitor, and the cathode of the third diode is used to connect to the high potential output terminal of the power module. The first connection terminal of the third impedance element is connected to the anode of the third diode, and the second connection terminal of the third impedance element is connected to the cathode of the third diode.
5. The holding circuit according to any one of claims 1 to 4, characterized in that, The circuit also includes a power failure detection module; The power failure detection module includes an optocoupler and a fourth impedance element; The first input terminal of the optocoupler is used to connect to the first input terminal of the power module, and the second input terminal of the optocoupler is used to connect to the second input terminal of the power module; The collector of the optocoupler is connected to the first connection terminal of the fourth impedance element, and the emitter of the optocoupler is grounded. The second connection terminal of the fourth impedance element is connected to the high potential terminal of the external power supply; the first connection terminal of the fourth impedance element is also used to connect to the signal input terminal of the controller.
6. The holding circuit according to claim 5, characterized in that The power failure detection module also includes a sixth impedance element; The first connection terminal of the sixth impedance element is connected to the first input terminal of the optocoupler, and the second connection terminal of the sixth impedance element is connected to the second input terminal of the optocoupler.
7. The holding circuit according to claim 5, characterized in that The power failure detection module also includes a seventh impedance element and an eighth impedance element; The first input terminal of the optocoupler is used to connect to the first input terminal of the power module through the seventh impedance element, and the second input terminal of the optocoupler is used to connect to the second input terminal of the power module through the eighth impedance element.
8. The holding circuit according to claim 5, characterized in that, The power failure detection module also includes a third capacitor; The first connection terminal of the third capacitor is connected to the first connection terminal of the fourth impedance element, and the second connection terminal of the third capacitor is grounded.
9. The holding circuit according to claim 8, characterized in that The power failure detection module also includes a fifth impedance element; The first connection terminal of the fifth impedance element is connected to the first connection terminal of the fourth impedance element, and the second connection terminal of the fifth impedance element is connected to the first connection terminal of the third capacitor.
10. A charging device, characterized by Includes the holding circuit according to any one of claims 1 to 9.