Standby power supply management circuit and multi-turn encoder

Abstract

The utility model discloses a stand-by power supply management circuit and a multi-turn encoder, the stand-by power supply management circuit is applied to the multi-turn encoder, and the stand-by power supply management circuit comprises a transistor switch circuit. The first end, the second end and the third end of the transistor switching circuit are electrically connected with a first standby power supply, a second standby power supply and a load respectively, and the transistor switching circuit is used for determining the standby power supply for supplying power to the load according to the output voltage of the first standby power supply and the output voltage of the second standby power supply. Based on the structure, the standby power supply management circuit provided by the utility model can prolong the power-off retention time of a multi-turn encoder system.

Description

Technical Field

[0001] The utility model relates to the technical field of encoders, in particular to a backup power management circuit and a multi-turn encoder. Background Art

[0002] In the fields of industrial automation and precision control, multi-turn encoders are critical position feedback components. Their performance and reliability directly impact the overall system's operating efficiency and data accuracy. Currently, the market's approach to implementing multi-turn encoders is to add a backup power system to a single-turn encoder, typically powered by dry-cell batteries. However, as battery life increases, users must regularly replace the batteries, increasing maintenance costs and creating operational inconvenience in certain applications where accessibility or disassembly is difficult. Furthermore, the use of dry-cell batteries raises issues of environmentally friendly disposal and resource recycling.

[0003] To overcome the limitations of dry cell batteries, some manufacturers are experimenting with integrating rechargeable batteries into encoders, aiming to extend their lifespan and reduce maintenance costs. While this design may seem to eliminate the need for frequent battery replacement, in practice, the complexity and reliability of the battery management system (BMS) present new challenges. Ensuring sufficient battery capacity to ensure continuous and stable system operation is a pressing issue, particularly during extended power outages. However, most current system designs utilize only a single rechargeable backup power supply for safety reasons. This single-source design is particularly vulnerable to extreme situations. If the backup power supply is uncharged for an extended period or becomes damaged, the entire system loses position feedback capability, potentially leading to production halts, equipment damage, and even safety incidents. Utility Model Content

[0004] The utility model aims to provide a backup power management circuit and a multi-turn encoder, aiming to solve the problem of insufficient system power-off holding time of the existing multi-turn encoder.

[0005] An embodiment of the present utility model provides a backup power management circuit, which is applied to a multi-turn encoder. The backup power management circuit includes a transistor switching circuit. The first end, the second end, and the third end of the transistor switching circuit are electrically connected to a first backup power supply, a second backup power supply, and a load, respectively. The transistor switching circuit is used to determine the backup power supply to supply power to the load based on the output voltages of the first backup power supply and the second backup power supply.

[0006] Furthermore, the transistor switching circuit includes: a second diode and a third diode, the anode of the second diode is electrically connected to the first backup power supply, the cathode of the second diode is electrically connected to one end of the load, the anode of the third diode is electrically connected to the second backup power supply, the cathode of the third diode is electrically connected to one end of the load, and the other end of the load is grounded, wherein the rated output voltage of the first backup power supply is different from the rated output voltage of the second backup power supply.

[0007] Furthermore, the transistor switch circuit includes: a MOS transistor, a third resistor, and a fourth diode, wherein the gate of the MOS transistor, one end of the third resistor, and the first backup power supply are all electrically connected to the positive electrode of the fourth diode, the negative electrode of the fourth diode is electrically connected to one end of the load, the source of the MOS transistor is electrically connected to the second backup power supply, the drain of the MOS transistor is electrically connected to one end of the load, the other end of the load is grounded, and the other end of the third resistor is electrically connected to the second backup power supply, wherein the rated output voltage of the first backup power supply is greater than the rated output voltage of the second backup power supply.

[0008] Furthermore, at least one of the first backup power supply and the second backup power supply is a rechargeable battery, and the backup power supply management circuit also includes a charging circuit for charging the rechargeable battery, and the charging circuit includes: a power regulator, a first diode and a first resistor, the input end of the power regulator is electrically connected to the positive pole of the charging power supply, the output end of the power regulator is electrically connected to the positive pole of the first diode, the third end of the power regulator is grounded, the negative pole of the first diode is electrically connected to one end of the rechargeable battery, and the other end of the rechargeable battery is electrically connected to the negative pole of the charging power supply.

[0009] Furthermore, the backup power management circuit also includes a detection circuit, which includes: a processor and a second resistor, the output end of the power regulator is electrically connected to one end of the second resistor, and the other end of the second resistor is grounded, and the processor is electrically connected to the output end of the power regulator, for detecting the level change on the second resistor to determine the number of times the rechargeable battery is charged.

[0010] Furthermore, the processor further includes: a life monitoring and alarm module, which is configured to generate an alarm signal when it is detected that the number of charging times reaches a threshold.

[0011] Furthermore, the first backup power supply is a rechargeable battery, and the second backup power supply is a non-rechargeable battery.

[0012] Furthermore, the rated output voltage of the first backup power supply is 3.6V, and the rated output voltage of the second backup power supply is 3V.

[0013] An embodiment of the present invention provides a multi-turn encoder, comprising: the above-mentioned backup power management circuit, a first backup power supply, a second backup power supply, and a charging power supply.

[0014] The utility model discloses a backup power management circuit and a multi-turn encoder. The backup power management circuit is applied to a multi-turn encoder and includes a transistor switch circuit. The first, second, and third terminals of the transistor switch circuit are electrically connected to a first backup power supply, a second backup power supply, and a load, respectively. The transistor switch circuit is configured to determine the backup power supply to supply the load based on the output voltages of the first and second backup power supplies. By providing the first and second backup power supplies and using the transistor switch circuit to determine the backup power supply to supply the load, the utility model can increase the system power-off hold time of the multi-turn encoder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of the structure of a backup power management circuit provided in an embodiment of the present application;

[0017] Figure 2 A schematic structural diagram of a transistor switch circuit provided in an embodiment of the present application;

[0018] Figure 3 A schematic structural diagram of another transistor switch circuit provided in an embodiment of the present application;

[0019] Figure 4 A schematic diagram of the structure of a charging circuit provided in an embodiment of the present application;

[0020] Figure 5 A schematic diagram of the structure of a detection circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0023] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0024] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0025] See also Figure 1-3 An embodiment of the present application provides a backup power management circuit, which is applied to a multi-turn encoder. The backup power management circuit includes a transistor switching circuit. The first end, the second end, and the third end of the transistor switching circuit are electrically connected to the first backup power supply, the second backup power supply, and the load, respectively. The transistor switching circuit is used to determine the backup power supply to supply power to the load based on the output voltages of the first backup power supply and the second backup power supply.

[0026] By setting up a first backup power supply and a second backup power supply, the utility model can ensure that when one of the backup power supplies is exhausted or damaged and fails to power the system, the other backup power supply is automatically enabled to continue powering the system, thereby increasing the power-off holding time of the circle encoder system.

[0027] As an example, see Figure 1 and Figure 4At least one of the first backup power supply and the second backup power supply is a rechargeable battery. The backup power supply management circuit further includes a charging circuit for charging the rechargeable battery. The charging circuit includes: a power regulator, a first diode D1, and a first resistor R1. The positive electrode of the charging power supply V1 is electrically connected to the input end of the power regulator, the output end of the power regulator is electrically connected to the positive electrode of the first diode D1, a third end of the power regulator is grounded, the negative electrode of the first diode D1 is electrically connected to one end of the rechargeable battery, and the other end of the rechargeable battery is electrically connected to the negative electrode of the charging power supply V1.

[0028] Rechargeable batteries are charged via power supply V1, eliminating the need for regular battery replacement and enhancing convenience. Power regulators also typically include built-in overcurrent and overvoltage protection, automatically cutting off current or reducing voltage in abnormal situations to prevent damage to the rechargeable battery. This self-protection mechanism enhances circuit reliability and safety.

[0029] It can be understood that the first diode D1 is used to limit the current direction, and the first resistor R1 is used to limit the charging current.

[0030] In one embodiment, the power regulator can be an LDO power regulator. An LDO power regulator has a low dropout characteristic, capable of maintaining a small voltage difference between the input voltage and the output voltage while providing a stable output voltage required by the load. This ensures that the voltage received by the rechargeable battery during charging is constant and safe, which helps extend the life of the backup power supply and improve charging efficiency.

[0031] See also Figure 1 and Figure 5 As one embodiment, the backup power management circuit further includes a detection circuit, which includes: a processor and a second resistor R2, the output end of the power regulator is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is grounded, and the processor is electrically connected to the output end of the power regulator, and is used to detect a level change on the second resistor to determine the number of charging times of the rechargeable battery.

[0032] Specifically, the processor records the number of 5V power-ups, i.e., the number of rechargeable battery charge cycles, by detecting the voltage level at the input of the second resistor R2. In this embodiment, when the rechargeable battery is charging, the first diode is conducting, and the processor detects that the voltage level at the input of the second resistor R2 is high. When the rechargeable battery is fully charged, the charging power source V1 is disconnected, discharging the rechargeable battery. However, the first diode D1 is turned off, and the processor detects that the voltage level at the input of the second resistor R2 is low. At this point, the processor records the number of recharge cycles.

[0033] As one embodiment, the processor further includes: a life monitoring and alarm module, wherein the life monitoring and alarm module is configured to generate an alarm signal when it is detected that the number of charging times reaches a threshold.

[0034] Specifically, by setting a threshold H, when the number of records = H, the life monitoring and alarm module of the processor generates an alarm signal to prompt the replacement of the rechargeable battery, thereby improving the safety and reliability of the system.

[0035] In this embodiment, the transistor switch circuit has two control modes:

[0036] The first is automatic control through diodes, such as Schottky diodes. Figure 2 The transistor switch circuit includes: a second diode D2 and a third diode D3, wherein the anode of the second diode D2 is electrically connected to the first backup power supply, the cathode of the second diode D2 is electrically connected to one end of the load, the anode of the third diode D3 is electrically connected to the second backup power supply, the cathode of the third diode D3 is electrically connected to one end of the load, and the other end of the load is grounded, wherein the rated output voltage of the first backup power supply is different from the rated output voltage of the second backup power supply.

[0037] In one embodiment, the rated output voltage of the first backup power supply is greater than the rated output voltage of the second backup power supply. When the power supply is sufficient, the actual output voltage of the first backup power supply is greater than the actual output voltage of the second backup power supply. The second diode D2 is turned on and the third diode D3 is turned off, and the first backup power supply supplies power to the load. When the actual output voltage of the first backup power supply drops below the actual output voltage of the second backup power supply, the second diode D2 is turned off and the third diode D3 is turned on. At this time, the second backup power supply supplies power to the load, thereby achieving automatic switching from the first backup power supply to the second backup power supply, ensuring normal operation of the system. This automatic switching mechanism increases the maintenance time of the multi-turn encoder system after power failure.

[0038] The second method is to control the switch through a transistor or MOS tube. Figure 3 The transistor switch circuit includes: a MOS transistor Q1, a third resistor R3, and a fourth diode D4. The gate of the MOS transistor Q1, one end of the third resistor R3, and the first backup power supply are all electrically connected to the anode of the fourth diode D4. The cathode of the fourth diode D4 is electrically connected to one end of the load. The source of the MOS transistor Q1 is electrically connected to the second backup power supply. The drain of the MOS transistor Q1 is electrically connected to one end of the load. The other end of the load is grounded. The other end of the third resistor R3 is electrically connected to the second backup power supply. The rated output voltage of the first backup power supply is greater than the rated output voltage of the second backup power supply.

[0039] Specifically, when the power is sufficient, the actual output voltage of the first backup power supply is higher than that of the second backup power supply, MOS transistor Q1 is turned off, and the fourth diode D4 is turned on, allowing the first backup power supply to supply power to the load. When the actual output voltage of the first backup power supply drops below that of the second backup power supply, the voltage across the third resistor R3 exceeds the conduction threshold of MOS transistor Q1, causing MOS transistor Q1 to conduct, the fourth diode D4 to turn off, and the second backup power supply to supply power to the load. This achieves automatic switching from the first backup power supply to the second backup power supply, ensuring normal system operation. This automatic switching mechanism increases the hold time of the multi-turn encoder system after power failure.

[0040] As one embodiment, the first backup power source is a rechargeable battery, and the second backup power source is a non-rechargeable battery (eg, a disposable large-capacity battery).

[0041] As a primary backup power source, rechargeable batteries can quickly take over when the primary power source fails, ensuring continuous operation of the equipment. Non-rechargeable batteries, used as a secondary backup power source, can continue to provide power even after the rechargeable battery is depleted, creating a dual guarantee and significantly enhancing continuous power supply capabilities.

[0042] Among them, disposable large-capacity batteries are not limited to lithium batteries, but can also be sodium batteries, etc., which are characterized by large capacity, strong energy storage and low loss.

[0043] Furthermore, the rated output voltage of the first backup power supply may be 3.6V, and the rated output voltage of the second backup power supply may be 3V.

[0044] The combination of a high-rated output voltage primary backup power supply and a low-rated output voltage secondary backup power supply allows for a more sophisticated hierarchical power supply strategy. For example, under normal circumstances, the equipment is powered by the primary power supply. If the primary power supply fails, the primary backup power supply is first activated to meet the high load demand. If the primary backup power supply also fails, the low-voltage secondary backup power supply is activated to maintain basic system operations. This strategy helps optimize energy use and extend the life of the backup power supplies.

[0045] like Figure 1 As shown, an embodiment of the present application further provides a multi-turn encoder, comprising: a backup power management circuit of any of the above embodiments, a first backup power supply, a second backup power supply, and a charging power supply.

[0046] As one embodiment, the multi-turn encoder further includes: a storage unit (such as EEPROM), and the storage unit is connected to the processor signal in the detection circuit.

[0047] After the processor detects the number of times the first backup power source has been charged, the processor stores the data of the number of times the first backup power source has been charged in the storage unit to ensure that the data is reliable and non-volatile.

[0048] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0049] It should also be noted that, in this specification, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprising" or any other variations thereof are intended to cover non-exclusive.

[0050] Inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

Claims

1. A backup power management circuit, applied to a multi-turn encoder, characterized in that: The backup power management circuit includes a transistor switching circuit, the first end, the second end and the third end of the transistor switching circuit are electrically connected to the first backup power supply, the second backup power supply and the load respectively, and the transistor switching circuit is used to determine the backup power supply to supply power to the load based on the output voltages of the first backup power supply and the second backup power supply.

2. The backup power management circuit according to claim 1, wherein: The transistor switching circuit includes: a second diode and a third diode, the anode of the second diode is electrically connected to the first backup power supply, the cathode of the second diode is electrically connected to one end of the load, the anode of the third diode is electrically connected to the second backup power supply, the cathode of the third diode is electrically connected to one end of the load, and the other end of the load is grounded, wherein the rated output voltage of the first backup power supply is different from the rated output voltage of the second backup power supply.

3. The backup power management circuit according to claim 1, wherein: The transistor switch circuit includes: a MOS transistor, a third resistor, and a fourth diode. The gate of the MOS transistor, one end of the third resistor, and the first backup power supply are all electrically connected to the anode of the fourth diode. The cathode of the fourth diode is electrically connected to one end of the load. The source of the MOS transistor is electrically connected to the second backup power supply. The drain of the MOS transistor is electrically connected to one end of the load. The other end of the load is grounded. The other end of the third resistor is electrically connected to the second backup power supply. The rated output voltage of the first backup power supply is greater than the rated output voltage of the second backup power supply.

4. The backup power management circuit according to any one of claims 1 to 3, characterized in that: At least one of the first backup power supply and the second backup power supply is a rechargeable battery. The backup power supply management circuit also includes a charging circuit for charging the rechargeable battery. The charging circuit includes: a power regulator, a first diode and a first resistor. The input end of the power regulator is electrically connected to the positive electrode of the charging power supply, the output end of the power regulator is electrically connected to the positive electrode of the first diode, the third end of the power regulator is grounded, the negative electrode of the first diode is electrically connected to one end of the rechargeable battery, and the other end of the rechargeable battery is electrically connected to the negative electrode of the charging power supply.

5. The backup power management circuit according to claim 4, characterized in that: The backup power management circuit also includes a detection circuit, which includes: a processor and a second resistor, the output end of the power regulator is electrically connected to one end of the second resistor, and the other end of the second resistor is grounded, and the processor is electrically connected to the output end of the power regulator, and is used to detect the level change on the second resistor to determine the number of times the rechargeable battery is charged.

6. The backup power management circuit according to claim 5, characterized in that: The processor further includes a life monitoring and alarm module, configured to generate an alarm signal when detecting that the number of charging times reaches a threshold.

7. The backup power management circuit according to claim 2 or 3, characterized in that: The first backup power source is a rechargeable battery, and the second backup power source is a non-rechargeable battery.

8. The backup power management circuit according to claim 7, wherein: The rated output voltage of the first backup power supply is 3.6V, and the rated output voltage of the second backup power supply is 3V.

9. A multi-turn encoder, characterized in that: include: The backup power management circuit, the first backup power supply, the second backup power supply, and the charging power supply according to any one of claims 1 to 8.

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