Charging circuit and industrial control equipment

Abstract

The utility model discloses a charging circuit and industrial control equipment, the charging circuit comprises a switching circuit, a control circuit, a first monitoring circuit and a voltage regulation circuit, the input end of the switching circuit is connected with a power supply, and the output end of the switching circuit is connected with the charging end of an energy storage circuit; the input end of the control circuit is connected with the charging end of the energy storage circuit; the input end of the first monitoring circuit is connected with the charging end of the energy storage circuit, and the output end of the first monitoring circuit is connected with the controlled end of the switching circuit; the input end of the voltage adjusting circuit is connected with the output end of the control circuit, and the output end of the voltage adjusting circuit is connected with the controlled end of the first monitoring circuit. The problem that after an existing energy storage circuit is aged, stored energy is reduced, the energy storage requirement of power-down maintenance of equipment cannot be met any more, and the power-down maintenance function of the equipment is abnormal is solved.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a charging circuit and industrial control equipment. Background Technology

[0002] For many industrial control devices, power-off retention is a common method using energy storage circuits, such as supercapacitors. Generally, the charging voltage and usage time of the energy storage circuit affect its lifespan; the higher the charging voltage or the longer the usage time, the shorter the lifespan of the energy storage circuit. In addition, the higher the charging voltage of the energy storage circuit, the greater the energy it can store.

[0003] In related technologies, in order to balance the energy storage and lifespan of the energy storage circuit, the charging voltage is usually not set to the maximum value, but is set to a suitable value according to the energy storage requirements for power failure retention. However, as the energy storage circuit is used for longer periods of time, it will gradually age. Under the previously set charging voltage, the energy stored in the aged energy storage circuit will be reduced, and it will no longer be able to meet the energy storage requirements for power failure retention of the device, resulting in abnormal power failure retention function of the device. Utility Model Content

[0004] The main purpose of this application is to provide a charging circuit and industrial control equipment, which aims to solve the problem that after the existing energy storage circuit ages, the stored energy decreases and can no longer meet the energy storage requirements of the equipment when it is powered off, resulting in abnormal power-off retention function of the equipment.

[0005] To achieve the above objectives, this application provides a charging circuit, the charging circuit comprising:

[0006] A switching circuit, wherein the input terminal of the switching circuit is connected to a power supply, and the output terminal of the switching circuit is connected to the charging terminal of an energy storage circuit;

[0007] A control circuit, wherein the input terminal of the control circuit is connected to the charging terminal of the energy storage circuit;

[0008] A first monitoring circuit, wherein the input terminal of the first monitoring circuit is connected to the charging terminal of the energy storage circuit, and the output terminal of the first monitoring circuit is connected to the controlled terminal of the switching circuit.

[0009] A voltage adjustment circuit, wherein the input terminal of the voltage adjustment circuit is connected to the output terminal of the control circuit, and the output terminal of the voltage adjustment circuit is connected to the controlled terminal of the first monitoring circuit;

[0010] If the energy storage circuit is not aged, the control circuit controls the voltage adjustment circuit to be in the off state, so that the first monitoring circuit outputs a switch control signal when the charging voltage of the energy storage circuit is a first voltage value, and controls the switch circuit to switch to the off state to stop charging the energy storage circuit.

[0011] If the energy storage circuit meets the aging requirements, the control circuit controls the voltage adjustment circuit to be in the on state, so that the first monitoring circuit outputs a switch control signal when the charging voltage of the energy storage circuit is a second voltage value, controlling the switch circuit to switch to the off state to stop charging the energy storage circuit; the second voltage value is greater than the first voltage value.

[0012] In one embodiment, the switching circuit includes a first switching transistor, a first resistor, and a second resistor;

[0013] The first terminal of the first switching transistor is connected to the power supply, and the second terminal of the first switching transistor is connected to the charging terminal of the energy storage circuit; the first terminal of the first resistor is connected to the power supply and the first terminal of the first switching transistor; the first terminal of the second resistor is connected to the controlled terminal of the first switching transistor, and the second terminals of the second resistor and the second terminals of the first resistor are connected to the output terminal of the first monitoring circuit.

[0014] In one embodiment, the first monitoring circuit includes a first voltage monitoring unit, a third resistor, a fourth resistor, and a fifth resistor;

[0015] The first terminal of the first voltage monitoring unit is connected to the second terminal of the first resistor and the second terminal of the second resistor. The first terminal of the third resistor is connected to the charging terminal of the energy storage circuit. The second terminal of the third resistor and the first terminal of the fourth resistor are connected to the controlled terminal of the first voltage monitoring unit. The second terminal of the fourth resistor is connected to the first terminal of the fifth resistor. The second terminal of the fifth resistor and the second terminal of the first voltage monitoring unit are grounded.

[0016] In one embodiment, the voltage adjustment circuit includes a second switching transistor and a sixth resistor;

[0017] The first terminal of the second switch is connected to the second terminal of the third resistor and the first terminal of the fourth resistor. The second terminal of the second switch is connected to the second terminal of the fourth resistor and the first terminal of the fifth resistor. The controlled terminal of the second switch is connected to the output terminal of the control circuit and the first terminal of the sixth resistor. The second terminal of the sixth resistor is grounded.

[0018] In one embodiment, the charging circuit further includes a current limiting circuit;

[0019] The input terminal of the current limiting circuit is connected to the power supply, the output terminal of the current limiting circuit is connected to the input terminal of the switching circuit, the controlled terminal of the current limiting circuit is connected to the charging terminal of the energy storage circuit, and the current limiting circuit is used to adjust the charging current of the energy storage circuit.

[0020] In one embodiment, the current limiting circuit includes;

[0021] A current limiting unit, wherein the input terminal of the current limiting unit is connected to the power supply, and the output terminal of the current limiting unit is connected to the input terminal of the switching circuit;

[0022] A current adjustment circuit, wherein the current adjustment circuit is connected to the power supply and the current limiting unit;

[0023] The second monitoring circuit has its output terminal connected to the controlled terminal of the current adjustment circuit and its input terminal connected to the charging terminal of the energy storage circuit.

[0024] If the charging voltage of the energy storage circuit is less than the third voltage value, the second monitoring circuit is turned off, so that the current adjustment circuit is turned off, and the power supply charges the energy storage circuit according to the first current value.

[0025] If the charging voltage of the energy storage circuit is greater than or equal to the third voltage value, the second monitoring circuit is in the conducting state, so that the current adjustment circuit is in the conducting state, and the power supply charges the energy storage circuit according to the second current value; the first current value is less than the second current value, and the third voltage value is less than the first voltage value.

[0026] In one embodiment, the current limiting unit includes a seventh resistor and an eighth resistor;

[0027] The first end of the seventh resistor is connected to the power supply, the second end of the seventh resistor is connected to the first end of the eighth resistor, and the second end of the eighth resistor is connected to the input terminal of the switching circuit.

[0028] In one embodiment, the current adjustment circuit includes a third switching transistor, a ninth resistor, and a tenth resistor;

[0029] The first terminal of the third switch is connected to the power supply, the first terminal of the seventh resistor, and the first terminal of the ninth resistor. The second terminal of the third switch is connected to the second terminal of the seventh resistor and the first terminal of the eighth resistor. The controlled terminal of the third switch is connected to the first terminal of the tenth resistor. The second terminals of the ninth resistor and the tenth resistor are connected to the output terminal of the second monitoring circuit.

[0030] In one embodiment, the second monitoring circuit includes a second voltage monitoring unit, an eleventh resistor, and a twelfth resistor;

[0031] The first terminal of the second voltage monitoring unit is connected to the second terminal of the ninth resistor and the second terminal of the tenth resistor. The first terminal of the eleventh resistor is connected to the charging terminal of the energy storage circuit. The second terminal of the eleventh resistor and the first terminal of the twelfth resistor are connected to the controlled terminal of the second voltage monitoring unit. The second terminal of the twelfth resistor and the second terminal of the second voltage monitoring unit are grounded.

[0032] In addition, to achieve the above objectives, this application also provides an industrial control device, which includes the charging circuit described above.

[0033] The charging circuit provided in this application includes a switching circuit, a control circuit, a first monitoring circuit, and a voltage adjustment circuit. The input terminal of the switching circuit is connected to the power supply, and the output terminal of the switching circuit is connected to the charging terminal of the energy storage circuit. The input terminal of the control circuit is connected to the charging terminal of the energy storage circuit. The input terminal of the first monitoring circuit is connected to the charging terminal of the energy storage circuit, and the output terminal of the first monitoring circuit is connected to the controlled terminal of the switching circuit. The input terminal of the voltage adjustment circuit is connected to the output terminal of the control circuit, and the output terminal of the voltage adjustment circuit is connected to the controlled terminal of the first monitoring circuit. If the energy storage circuit is not aged, the control circuit controls the voltage adjustment circuit to be in the off state. When the charging voltage of the energy storage circuit is a first voltage value, the first monitoring circuit outputs a switch control signal to control the switching circuit to switch to the off state to stop charging the energy storage circuit. If the energy storage circuit is aged, the control circuit controls the voltage adjustment circuit to be in the on state. When the charging voltage of the energy storage circuit is a second voltage value, the first monitoring circuit outputs a switch control signal to control the switching circuit to switch to the off state to stop charging the energy storage circuit. The second voltage value is greater than the first voltage value. This solution uses a voltage adjustment circuit to increase the charging voltage of the energy storage circuit from a first voltage value to a second voltage value when the energy storage circuit ages. This increases the energy stored in the energy storage circuit, thereby meeting the energy storage requirements for power-off retention and avoiding the problem of abnormal power-off retention function after the energy storage circuit ages. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the structure of an embodiment of the charging circuit provided in this application;

[0036] Figure 2 A schematic diagram of the structure of an embodiment of the charging circuit provided in this application;

[0037] Figure 3 A flowchart illustrating the aging judgment method for energy storage circuits provided in this application.

[0038] Explanation of icon numbers:

[0039] 100. Charging circuit; 10. Switching circuit; 20. Control circuit; 30. First monitoring circuit; 40. Voltage adjustment circuit; 50. Power supply; 60. Energy storage circuit; 70. Current limiting circuit; 71. Current limiting unit; 72. Current adjustment circuit; 73. Second monitoring circuit; Q1~Q3, First switching transistor~Third switching transistor; U1~U2, First monitoring unit~Second monitoring unit; R1~R12, First resistor~Twelfth resistor.

[0040] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] 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 a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, in the embodiments of this application, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In the embodiments of this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0045] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the embodiments of this application.

[0046] To better understand the above technical solution, the following detailed explanation is provided in conjunction with the accompanying drawings.

[0047] Currently, for many industrial control equipment, using energy storage circuits, such as supercapacitors, for power-off retention is a common method. Generally, the charging voltage and usage time of the energy storage circuit will affect its lifespan. The higher the charging voltage or the longer the usage time, the shorter the lifespan of the energy storage circuit. In addition, the higher the charging voltage of the energy storage circuit, the greater the energy it can store.

[0048] In related technologies, in order to balance the energy storage and lifespan of the energy storage circuit, the charging voltage is usually not set to the maximum value, but is set to a suitable value according to the energy storage requirements for power failure retention. However, as the energy storage circuit is used for longer periods of time, it will gradually age. Under the previously set charging voltage, the energy stored in the aged energy storage circuit will be reduced, and it will no longer be able to meet the energy storage requirements for power failure retention of the device, resulting in abnormal power failure retention function of the device.

[0049] In view of this, in order to solve the problems in the related technology, this application provides a charging circuit and an industrial control device.

[0050] In one embodiment of this application, such as Figure 1As shown, this application provides a charging circuit 100, which includes a switching circuit 10, a control circuit 20, a first monitoring circuit 30, and a voltage adjustment circuit 40. The input terminal of the switching circuit 10 is connected to a power supply 50, and the output terminal of the switching circuit 10 is connected to the charging terminal of an energy storage circuit 60. The input terminal of the control circuit 20 is connected to the charging terminal of the energy storage circuit 60. The input terminal of the first monitoring circuit 30 is connected to the charging terminal of the energy storage circuit 60, and the output terminal of the first monitoring circuit 30 is connected to the controlled terminal of the switching circuit 10. The input terminal of the voltage adjustment circuit 40 is connected to the output terminal of the control circuit 20, and the output terminal of the voltage adjustment circuit 40 is connected to the controlled terminal of the first monitoring circuit 30.

[0051] In this embodiment, the switching circuit 10 is a circuit with switching function, which can be a circuit composed of MOSFETs and resistor-capacitor devices; the control circuit 20 can be a control chip, such as a CPU, MCU, or FPGA; the energy storage circuit 60 can be a circuit composed of supercapacitors, or other circuits with energy storage function; the first monitoring circuit 30 is a circuit used to monitor the charging voltage of the energy storage circuit 60, which can be a circuit built with TL431 and resistor-capacitor devices, or a circuit built with a voltage monitoring module; the voltage adjustment circuit 40 is a circuit used to adjust the charging voltage of the energy storage circuit 60, which can be a circuit composed of MOSFETs and resistor-capacitor devices; and the power supply 50 is a charging power supply used to charge the energy storage circuit 60.

[0052] The charging circuit provided in this embodiment works on the following principle:

[0053] If the energy storage circuit 60 is not aged, during the charging process of the energy storage circuit 60 by the power supply 50, the switching circuit 10 is in the on state, and the voltage adjustment circuit 40 is in the off state under the control signal output by the control circuit 20. The first monitoring circuit 30 monitors the charging voltage of the energy storage circuit 60. As charging continues, when the first monitoring circuit 30 detects that the charging voltage of the energy storage circuit 60 reaches a first voltage value, the first monitoring circuit 30 outputs a switch control signal to control the switching circuit 10 to switch from the on state to the off state, disconnecting the charging circuit of the energy storage circuit 60 from the power supply 50 and stopping the charging of the energy storage circuit 60. The first voltage value is a pre-set charging voltage of the energy storage circuit 60 based on the device's power-off retention requirements. It is usually lower than the maximum charging voltage that the energy storage circuit 60 can reach. The first voltage value can be set according to actual conditions, and this embodiment does not limit this setting.

[0054] If the energy storage circuit 60 ages, the energy it can store at the preset first charging voltage will be lower than before aging, failing to meet the energy storage requirements for power-off retention. In this case, during charging of the energy storage circuit 60 by the power supply 50, the switching circuit 10 is in the ON state, and the voltage adjustment circuit 40 is also in the ON state under the control signal output by the control circuit 20. The first monitoring circuit 30 monitors the charging voltage of the energy storage circuit 60. As charging continues, when the first monitoring circuit 30 detects that the charging voltage of the energy storage circuit 60 reaches the second voltage value, it outputs a switch control signal to switch the switching circuit 10 from the ON state to the OFF state, disconnecting the charging circuit from the power supply 50 to the energy storage circuit 60 and stopping charging. The second voltage value is greater than the first voltage value and less than or equal to the maximum charging voltage that the energy storage circuit 60 can reach. Thus, even with aging, the charging voltage of the energy storage circuit 60 is increased, thereby increasing its stored energy and meeting the energy storage requirements for power-off retention. The second voltage value can be set according to the actual situation, and this embodiment does not limit it.

[0055] The technical solution provided in this application, by setting a voltage adjustment circuit 40, increases the charging voltage of the energy storage circuit 60 when it ages, thereby increasing the energy stored in the energy storage circuit 60. Even if the energy storage circuit ages and cannot be replaced in time, it can still meet the energy storage requirements of the device when it loses power, thus avoiding the problem of abnormal power loss retention function of the device after the energy storage circuit 60 ages.

[0056] In one embodiment of this application, aging refers to the energy stored in the energy storage circuit 60 not meeting the power-down retention requirements. The determination method is as follows: the control circuit 20 queries and sets a preset target flag bit. The target flag bit is used to characterize the device failing to complete the power-down retention operation three times in a row. Specifically, for the power-down retention operation of the equipment, the control circuit 20 is equipped with a first flag bit indicating the completion of the power-down retention operation and a second flag bit (target flag bit) indicating three consecutive failures to complete the power-down retention operation. Each time the equipment loses power, the power-down retention operation is performed. When the equipment is powered on again, the control circuit 20 checks whether the second flag bit is set. If the second flag bit is set, it means that the equipment has failed to complete the power-down retention operation three times in a row, and the energy storage circuit 60 has aged and meets the aging conditions. If the second flag bit is not set, the control circuit 20 checks whether the first flag bit is set. If the first flag bit is set, it means that the energy storage circuit 60 has not aged. If the first flag bit is not set, it records one instance of the equipment failing to complete the power-down retention operation. If the first flag bit is not set three times in a row, the second flag bit is set, indicating that the equipment has failed to complete the power-down retention operation three times in a row, and the energy storage circuit 60 has aged.

[0057] The technical solution provided in this application determines whether the energy storage circuit 60 has aged by querying the flag bit through the control circuit 20, making the determination of whether the energy storage circuit 60 has aged simple and accurate.

[0058] In one embodiment of this application, if the energy storage circuit 60 ages, the control circuit 20 will issue an alarm signal to remind the device user that the energy storage circuit 60 has aged and should be returned to the factory for replacement as soon as possible.

[0059] In one embodiment of this application, such as Figure 2 As shown, the switching circuit 10 includes a first switching transistor Q1, a first resistor R1, and a second resistor R2. The first terminal of the first switching transistor Q1 is connected to the power supply 50, and the second terminal of the first switching transistor Q1 is connected to the charging terminal of the energy storage circuit 60. The first terminal of the first resistor R1 is connected to both the power supply 50 and the first terminal of the first switching transistor Q1. The first terminal of the second resistor R2 is connected to the controlled terminal of the first switching transistor Q1, and the second terminals of the second resistor R2 and the second terminals of the first resistor R1 are connected to the output terminal of the first monitoring circuit 30. The first monitoring circuit 30 includes a first voltage monitoring unit U1, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The first terminal of the first voltage monitoring unit U1 is connected to the second terminals of the first resistor R1 and the second terminals of the second resistor R2. The first terminal of the third resistor R3 is connected to the charging terminal of the energy storage circuit 60. The second terminals of the third resistor R3 and the first terminals of the fourth resistor R4 are connected to the controlled terminal of the first voltage monitoring unit U1. The second terminal of the fourth resistor R4 is connected to the first terminal of the fifth resistor R5, and the second terminal of the fifth resistor R5 and the second terminal of the first voltage monitoring unit U1 are grounded. The voltage adjustment circuit 40 includes a second switch Q2 and a sixth resistor R6; the first terminal of the second switch Q2 is connected to the second terminal of the third resistor R3 and the first terminal of the fourth resistor R4, the second terminal of the second switch Q2 is connected to the second terminal of the fourth resistor R4 and the first terminal of the fifth resistor R5, the controlled terminal of the second switch Q2 is connected to the output terminal of the control circuit 20 and the first terminal of the sixth resistor R6, and the second terminal of the sixth resistor R6 is grounded.

[0060] In this embodiment, the first switch Q1 and the second switch Q2 are devices with switching functions, such as N-type MOSFETs, and the first monitoring unit U1 can be a TL431. The specifications of the first resistor R1 to the sixth resistor R6 can be selected according to actual needs.

[0061] The charging circuit 100 provided in this embodiment works on the following principle:

[0062] If the energy storage circuit 60 is not aged, during the charging process of the energy storage circuit 60 by the power supply 50, the first switch Q1 is turned on, and the control circuit 20 outputs a low-level signal to the controlled terminal of the second switch Q2, causing the second switch Q2 to turn off. The voltage of the controlled terminal of the first monitoring unit U1 is the sum of the voltages of the fourth resistor R4 and the fifth resistor R5. Initially, the voltage of the controlled terminal of the first monitoring unit U1 is lower than its turn-on voltage, and the first monitoring unit U1 is in the off state. As charging continues, when the charging voltage of the energy storage circuit 60 reaches the first voltage value, the voltage of the controlled terminal of the first monitoring unit U1 reaches the turn-on voltage of the first monitoring unit U1, and the first monitoring unit U1 switches to the on state. Then, the voltage of the controlled terminal of the first switch Q1 is a low-level signal, and the first switch Q1 switches to the off state, thereby disconnecting the charging circuit of the energy storage circuit 60 by the power supply 50 and stopping the charging of the energy storage circuit 60.

[0063] If the energy storage circuit 60 ages, during the charging process of the energy storage circuit 60 by the power supply 50, the first switch Q1 is turned on, and the control circuit 20 outputs a high-level signal to the controlled terminal of the second switch Q2, causing the second switch Q2 to turn on. At this time, the fourth resistor R4 is short-circuited by the second switch Q2, and the voltage of the controlled terminal of the first monitoring unit U1 is the voltage across the fifth resistor R5. Initially, the voltage of the controlled terminal of the first monitoring unit U1 is lower than its turn-on voltage, and the first monitoring unit U1 is in the off state. As charging continues, when the charging voltage of the energy storage circuit 60 reaches the second voltage value, the voltage of the controlled terminal of the first monitoring unit U1 reaches the turn-on voltage of the first monitoring unit U1, and the first monitoring unit U1 switches to the on state. Subsequently, the voltage of the controlled terminal of the first switch Q1 is a low-level signal, and the first switch Q1 switches to the off state, thereby disconnecting the charging circuit of the energy storage circuit 60 by the power supply 50 and stopping the charging of the energy storage circuit 60.

[0064] In the technical solution provided in this embodiment, when the energy storage circuit 60 ages, the conduction of the second switch Q2 short-circuits the fourth resistor R4, and the voltage at the controlled terminal of the first monitoring unit U1 becomes the voltage across the fifth resistor R5. Compared with before the energy storage circuit 60 ages, the voltage divider resistor becomes smaller. Therefore, the charging voltage of the energy storage circuit 60 required for the voltage at the controlled terminal of the first monitoring unit U1 to reach its turn-on voltage is higher. Thus, the conduction of the second switch Q2 actually increases the charging voltage of the energy storage circuit 60, thereby increasing the energy stored in the energy storage circuit 60, meeting the energy storage requirements for power-off retention of the device, and avoiding the problem of abnormal power-off retention function of the device after the energy storage circuit 60 ages.

[0065] In one embodiment of this application, such as Figure 2As shown, the charging circuit 100 also includes a current limiting circuit 70. The input terminal of the current limiting circuit 70 is connected to the power supply 50, the output terminal of the current limiting circuit 70 is connected to the input terminal of the switching circuit 10, and the controlled terminal of the current limiting circuit 70 is connected to the charging terminal of the energy storage circuit 60. The current limiting circuit 70 is used to adjust the charging current of the energy storage circuit 60.

[0066] In this embodiment, when the power supply 50 first starts charging the energy storage circuit 60, it typically needs to both charge the energy storage circuit 60 and supply power to the entire device system. Since the device system usually contains many small capacitors, in order to reduce the power supply pressure on the power supply 50, the power supply 50 needs a larger current to supply power to the device system when it first starts charging the energy storage circuit 60, and the corresponding charging current for the energy storage circuit 60 is relatively small. After a period of time, the power supply 50 supplies power to the device system with a smaller current, and correspondingly uses a larger charging current to charge the energy storage circuit 60, so as to improve the charging speed.

[0067] The working principle of the current limiting circuit 70 in this embodiment is as follows:

[0068] When the power supply 50 first starts charging the energy storage circuit 60, the resistance of the current limiting circuit 70 is relatively large, which is the first resistance value, in order to reduce the charging current of the power supply 50 to the energy storage circuit 60 and correspondingly increase the power supply current of the power supply 50 to the equipment system. After a period of time, the resistance of the current limiting circuit 70 is adjusted to a smaller second resistance value, in order to increase the charging current of the power supply 50 to the energy storage circuit 60 and correspondingly decrease the power supply current of the power supply 50 to the equipment system.

[0069] The technical solution provided in this embodiment can effectively reduce the power supply pressure of the power supply 50 and balance the charging speed of the energy storage circuit 60 by adjusting the charging current of the power supply 50 to the energy storage circuit 60 through the current limiting circuit 70.

[0070] In one embodiment of this application, such as Figure 2 As shown, the current limiting circuit 70 includes a current limiting unit 71, a current adjustment circuit 72, and a second monitoring circuit 73. The input terminal of the current limiting unit 71 is connected to the power supply 50, and the output terminal of the current limiting unit 71 is connected to the input terminal of the switching circuit 10. The current adjustment circuit 72 is connected to the power supply 50 and the current limiting unit 71. The output terminal of the second monitoring circuit 73 is connected to the controlled terminal of the current adjustment circuit 72, and the input terminal of the second monitoring circuit 73 is connected to the charging terminal of the energy storage circuit 60.

[0071] In this embodiment, the current limiting unit 71 is a circuit used to limit the charging current of the power supply 50 to the energy storage circuit 60, and is usually composed of a current limiting resistor; the second monitoring circuit 73 is a circuit used to monitor the charging voltage of the energy storage circuit 60, and can be a circuit built with a TL431 and resistor-capacitor components, or a circuit built with a voltage monitoring module; the current adjustment circuit 72 is a circuit used to adjust the resistance value of the current limiting unit 71, and can be a circuit composed of a P-type MOSFET and resistor-capacitor components.

[0072] The current limiting circuit 70 provided in this embodiment works on the following principle:

[0073] When the power supply 50 first starts charging the energy storage circuit 60, the charging voltage of the energy storage circuit 60 is relatively small. If the charging voltage of the energy storage circuit 60 is less than the third voltage value, the second monitoring circuit 73 is turned off, so that the current adjustment circuit 72 is turned off. At this time, the resistance of the current limiting unit 71 is a larger first resistance value, and the power supply 50 charges the energy storage circuit according to the smaller first current value. After a period of time, as charging progresses, the charging voltage of the energy storage circuit 60 gradually increases. If the charging voltage of the energy storage circuit 60 is greater than or equal to the third voltage value, the second monitoring circuit 73 is turned on, and then the current adjustment circuit 72 is turned on. The current adjustment circuit 72 and the second monitoring circuit 73 are in a conducting state. At this time, the resistance of the current limiting unit 71 is a smaller second resistance value, and the power supply 50 charges the energy storage circuit 60 according to the larger second current value. Herein, the first resistance value is greater than the second resistance value, the first current value is less than the second current value, and the third voltage value is less than the first voltage value. The first resistance value, the second resistance value, the first current value, the second current value, and the third voltage value can be determined according to the actual situation of the circuit. This embodiment does not limit this.

[0074] The technical solution provided in this embodiment, through the current limiting circuit 70 composed of the current limiting unit 71, the second monitoring unit 73 and the current adjustment circuit 72, can effectively reduce the power supply pressure of the power supply 50, and at the same time balance the charging speed of the energy storage circuit 60.

[0075] In one embodiment of this application, such as Figure 2As shown, the current limiting unit 71 includes a seventh resistor R7 and an eighth resistor R8; the first end of the seventh resistor R7 is connected to the power supply 50, the second end of the seventh resistor R7 is connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to the input terminal of the switching circuit 10; the current adjustment circuit 72 includes a third switch Q3, a ninth resistor R9, and a tenth resistor R10; the first end of the third switch Q3 is connected to the power supply 50, the first end of the seventh resistor R7, and the first end of the ninth resistor R9; the second end of the third switch Q3 is connected to the second end of the seventh resistor R7 and the first end of the eighth resistor R8; and the controlled end of the third switch Q3 is connected to the tenth resistor R10. The first terminal is connected, and the second terminals of the ninth resistor R9 and the tenth resistor R10 are connected to the output terminal of the second monitoring circuit 73. The second monitoring circuit 73 includes a second voltage monitoring unit U2, an eleventh resistor R11, and a twelfth resistor R12. The first terminal of the second voltage monitoring unit U2 is connected to the second terminals of the ninth resistor R9 and the tenth resistor R10. The first terminal of the eleventh resistor R11 is connected to the charging terminal of the energy storage circuit 60. The second terminals of the eleventh resistor R11 and the twelfth resistor R12 are connected to the controlled terminal of the second voltage monitoring unit U2. The second terminal of the twelfth resistor R12 and the second terminal of the second voltage monitoring unit U2 are grounded.

[0076] In this embodiment, the third switch Q3 is a device with switching function, such as a P-type MOSFET, and the second monitoring unit U2 can be a TL431. The specifications of the seventh resistor R7 to the twelfth resistor R12 can be selected according to actual needs.

[0077] The charging circuit 100 provided in this embodiment works on the following principle:

[0078] When power supply 50 first starts charging energy storage circuit 60, the charging voltage of energy storage circuit 60 is relatively small. If the charging voltage of energy storage circuit 60 is less than the third voltage value, the voltage at the controlled terminal of the second monitoring unit U2 is the voltage divided by the twelfth resistor R12. This voltage is lower than the turn-on voltage of the second monitoring unit U2, so the second monitoring unit U2 is turned off. Under the action of power supply 50, the controlled terminal of the third switch Q3 is a high-level signal, and the third switch Q3 is turned off. At this time, the resistance of current limiting unit 71 is the sum of the resistances of the seventh resistor R7 and the eighth resistor R8. Under the action of the seventh resistor R7 and the eighth resistor R8, power supply 50 determines the current limit based on the smaller of the third voltage values. A current value is used to charge the energy storage circuit 60. After a period of time, as charging proceeds, the charging voltage of the energy storage circuit 60 gradually increases. If the charging voltage of the energy storage circuit 60 is greater than or equal to the third voltage value, the voltage at the controlled terminal of the second monitoring unit U2 reaches its turn-on voltage, the second monitoring unit U2 is turned on, the controlled terminal of the third switch Q3 is a low-level signal, the third switch Q3 is turned on, at this time, the seventh resistor R7 is short-circuited by the third switch Q3, the resistance of the current limiting unit 71 is the resistance of the eighth resistor R8, under the action of the eighth resistor R8, the power supply 50 charges the energy storage circuit 60 according to the larger second current value.

[0079] In the technical solution provided in this embodiment, the resistance value of the current limiting unit 71 can be adjusted by turning on and off the second monitoring unit U2 and the third switching tube Q3, thereby adjusting the charging current of the power supply 50 to the energy storage circuit 60, effectively reducing the power supply pressure of the power supply 50, and balancing the charging speed of the energy storage circuit 60.

[0080] This application also provides an industrial control device, which includes the charging circuit 100 in any of the above embodiments. The specific structure of the charging circuit 100 is as described in the above embodiments. Since the industrial control device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0081] The corresponding technical features in the above embodiments can be used in combination without causing contradictions or making the solutions unfeasible.

[0082] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0083] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0084] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0085] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims. All of these forms are within the protection scope of this application.

Claims

1. A charging circuit, characterized in that, The charging circuit includes: A switching circuit, wherein the input terminal of the switching circuit is connected to a power supply, and the output terminal of the switching circuit is connected to the charging terminal of an energy storage circuit; A control circuit, wherein the input terminal of the control circuit is connected to the charging terminal of the energy storage circuit; A first monitoring circuit, wherein the input terminal of the first monitoring circuit is connected to the charging terminal of the energy storage circuit, and the output terminal of the first monitoring circuit is connected to the controlled terminal of the switching circuit. A voltage adjustment circuit, wherein the input terminal of the voltage adjustment circuit is connected to the output terminal of the control circuit, and the output terminal of the voltage adjustment circuit is connected to the controlled terminal of the first monitoring circuit; If the energy storage circuit is not aged, the control circuit controls the voltage adjustment circuit to be in the off state, so that the first monitoring circuit outputs a switch control signal when the charging voltage of the energy storage circuit is a first voltage value, and controls the switch circuit to switch to the off state to stop charging the energy storage circuit. If the energy storage circuit ages, the control circuit controls the voltage adjustment circuit to be in the on state, so that the first monitoring circuit outputs a switch control signal when the charging voltage of the energy storage circuit is a second voltage value, controlling the switch circuit to switch to the off state to stop charging the energy storage circuit; the second voltage value is greater than the first voltage value.

2. The charging circuit as described in claim 1, characterized in that, The switching circuit includes a first switching transistor, a first resistor, and a second resistor; The first terminal of the first switching transistor is connected to the power supply, and the second terminal of the first switching transistor is connected to the charging terminal of the energy storage circuit; the first terminal of the first resistor is connected to the power supply and the first terminal of the first switching transistor; the first terminal of the second resistor is connected to the controlled terminal of the first switching transistor, and the second terminals of the second resistor and the second terminals of the first resistor are connected to the output terminal of the first monitoring circuit.

3. The charging circuit as described in claim 2, characterized in that, The first monitoring circuit includes a first voltage monitoring unit, a third resistor, a fourth resistor, and a fifth resistor; The first terminal of the first voltage monitoring unit is connected to the second terminal of the first resistor and the second terminal of the second resistor. The first terminal of the third resistor is connected to the charging terminal of the energy storage circuit. The second terminal of the third resistor and the first terminal of the fourth resistor are connected to the controlled terminal of the first voltage monitoring unit. The second terminal of the fourth resistor is connected to the first terminal of the fifth resistor. The second terminal of the fifth resistor and the second terminal of the first voltage monitoring unit are grounded.

4. The charging circuit as described in claim 3, characterized in that, The voltage adjustment circuit includes a second switching transistor and a sixth resistor; The first terminal of the second switch is connected to the second terminal of the third resistor and the first terminal of the fourth resistor. The second terminal of the second switch is connected to the second terminal of the fourth resistor and the first terminal of the fifth resistor. The controlled terminal of the second switch is connected to the output terminal of the control circuit and the first terminal of the sixth resistor. The second terminal of the sixth resistor is grounded.

5. The charging circuit as described in claim 1, characterized in that, The charging circuit also includes a current limiting circuit; The input terminal of the current limiting circuit is connected to the power supply, the output terminal of the current limiting circuit is connected to the input terminal of the switching circuit, the controlled terminal of the current limiting circuit is connected to the charging terminal of the energy storage circuit, and the current limiting circuit is used to adjust the charging current of the energy storage circuit.

6. The charging circuit as described in claim 5, characterized in that, The current limiting circuit includes: A current limiting unit, wherein the input terminal of the current limiting unit is connected to the power supply, and the output terminal of the current limiting unit is connected to the input terminal of the switching circuit; A current adjustment circuit, wherein the current adjustment circuit is connected to the power supply and the current limiting unit; The second monitoring circuit has its output terminal connected to the controlled terminal of the current adjustment circuit and its input terminal connected to the charging terminal of the energy storage circuit. If the charging voltage of the energy storage circuit is less than the third voltage value, the second monitoring circuit is turned off, so that the current adjustment circuit is turned off, and the power supply charges the energy storage circuit according to the first current value. If the charging voltage of the energy storage circuit is greater than or equal to the third voltage value, the second monitoring circuit is in the conducting state, so that the current adjustment circuit is in the conducting state, and the power supply charges the energy storage circuit according to the second current value; the first current value is less than the second current value, and the third voltage value is less than the first voltage value.

7. The charging circuit as described in claim 6, characterized in that, The current limiting unit includes a seventh resistor and an eighth resistor; The first end of the seventh resistor is connected to the power supply, the second end of the seventh resistor is connected to the first end of the eighth resistor, and the second end of the eighth resistor is connected to the input terminal of the switching circuit.

8. The charging circuit as described in claim 7, characterized in that, The current adjustment circuit includes a third switching transistor, a ninth resistor, and a tenth resistor; The first terminal of the third switch is connected to the power supply, the first terminal of the seventh resistor, and the first terminal of the ninth resistor. The second terminal of the third switch is connected to the second terminal of the seventh resistor and the first terminal of the eighth resistor. The controlled terminal of the third switch is connected to the first terminal of the tenth resistor. The second terminals of the ninth resistor and the tenth resistor are connected to the output terminal of the second monitoring circuit.

9. The charging circuit as described in claim 8, characterized in that, The second monitoring circuit includes a second voltage monitoring unit, an eleventh resistor, and a twelfth resistor; The first terminal of the second voltage monitoring unit is connected to the second terminal of the ninth resistor and the second terminal of the tenth resistor. The first terminal of the eleventh resistor is connected to the charging terminal of the energy storage circuit. The second terminal of the eleventh resistor and the first terminal of the twelfth resistor are connected to the controlled terminal of the second voltage monitoring unit. The second terminal of the twelfth resistor and the second terminal of the second voltage monitoring unit are grounded.

10. An industrial control device, characterized in that, The industrial control equipment includes a charging circuit as described in any one of claims 1-9.

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