Power supply system for a control circuit and a pump
By setting a unidirectional conduction element and a charging control unit in the control circuit, and rationally arranging the charging time interval of the supercapacitor, the problems of frequent backup power supply replacement and voltage instability in the real-time clock circuit are solved, thereby achieving voltage stability and longer life of the supercapacitor and improving the ease of equipment maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI SHINHOO CANNED MOTOR PUMP CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-24
AI Technical Summary
Existing real-time clock circuits still require a backup power source when power is lost, button batteries need to be replaced frequently, and supercapacitors have unstable charging and short lifespans.
By setting a unidirectional conduction device and a charging control unit in the control circuit, the controller can reasonably arrange the charging time interval of the supercapacitor based on the time information of the clock chip, thus avoiding the supercapacitor from being constantly charged.
This achieves stable voltage and longer service life for supercapacitors, avoids unnecessary power loss, and improves the ease of equipment maintenance.
Smart Images
Figure CN224555216U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of real-time clock circuit technology, and more particularly to power supply systems and pumps for control circuits. Background Technology
[0002] Real-time clock (RTC) circuits are widely used in smart homes, industrial control, and consumer electronics, primarily to provide accurate time information. For example, a real-time clock circuit can be used in a pump to start the pump at preset time intervals.
[0003] In related technologies, in order to ensure that the real-time clock circuit can continue to keep time even when power is lost, a backup power supply is usually set up.
[0004] One implementation of backup power is a button battery. However, button batteries have a limited capacity and need to be replaced promptly after depletion, which is detrimental to equipment maintenance, especially for equipment that is difficult to install or remove and / or whose performance may be affected by installation or removal.
[0005] Another implementation method for backup power is supercapacitors. However, supercapacitors generally use passive charging, meaning they are always in a charging state, which leads to problems such as voltage instability and short lifespan. Utility Model Content
[0006] The purpose of this application is to provide a power supply system and pump for the control circuit, so as to achieve stable supercapacitor voltage and longer service life by reasonably arranging the charging time interval of the supercapacitor.
[0007] To achieve the above objectives, in a first aspect, embodiments of this application provide a power supply system for the control circuit, comprising:
[0008] Power interface;
[0009] A clock chip, including a VDD pin, wherein the VDD pin is connected to the power interface;
[0010] A first unidirectional conduction element is disposed between the power interface and the VDD pin to allow current from the power interface to flow unidirectionally from the power interface to the VDD pin.
[0011] A supercapacitor includes a positive terminal and a negative terminal, wherein the positive terminal is connected in parallel with the power interface to the VDD pin, and the negative terminal is grounded;
[0012] A second unidirectional conduction element is disposed between the positive terminal of the supercapacitor and the VDD pin, so that the current from the supercapacitor flows unidirectionally from the positive terminal of the supercapacitor to the VDD pin;
[0013] A controller, connected to the clock chip and the power interface, and including a control terminal;
[0014] A charging control unit includes a transistor, wherein the first conducting terminal of the transistor is connected to the power interface, the second conducting terminal of the transistor is connected to the positive terminal of the supercapacitor, and the base of the transistor is connected to the control terminal. The controller controls the transistor to turn on and off at set time intervals through the control terminal.
[0015] To achieve the above objectives, in a second aspect, embodiments of this application provide a pump, which includes the aforementioned power supply system.
[0016] Compared with the prior art, the embodiments of this application have at least the following beneficial effects:
[0017] The controller can control the transistor to turn on at set time intervals based on the time information from the clock chip, thereby charging the supercapacitor and preventing it from being constantly in a charging state. Therefore, this embodiment of the application achieves stable supercapacitor voltage and a longer service life by rationally arranging the charging time intervals. Attached Figure Description
[0018] Figure 1 A block diagram of a power supply system for a control circuit according to an embodiment of this application is shown.
[0019] Figure 2 A circuit diagram of a power supply system for a first control circuit according to an embodiment of this application is shown.
[0020] Figure 3 A circuit diagram of a power supply system for a second control circuit according to an embodiment of this application is shown.
[0021] Figure label:
[0022] Q1, Transistor; D3, First unidirectional conduction component; D4, Second unidirectional conduction component; E2, Supercapacitor; R2, Bias component; R3, First current limiting component; R4, Second current limiting component; R5, First pull-up resistor; R6, Second pull-up resistor; R7, Third pull-up resistor; C10, Filter capacitor. Detailed Implementation
[0023] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not all of them.
[0024] This application defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up," "down," "left," "right," "inner," and "outer," are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this application.
[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0026] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0027] This application relates to a power supply system for a control circuit, which can be applied to electrical equipment with a real-time clock circuit, such as pumps, refrigerators, and air conditioners. In this application embodiment, a pump is used as an example of the electrical equipment.
[0028] Figure 1 A block diagram of the power supply system for the control circuit according to an embodiment of this application is shown. Figure 1 As shown, the power supply system of the control circuit includes a power interface, a clock chip, a controller, a motor drive circuit, a supercapacitor, and a charging control unit.
[0029] The power interface is configured to connect to a power source. As an example, the power source could be 220V AC. The pump itself typically does not have its own power supply, so the power source can be external. However, for other electrical devices that have their own power supply, the power source can be internal. As an example, the power interface could be a plug or a socket.
[0030] The clock chip is connected to a power interface so that the power supply can power the clock chip. As an example, the clock chip could be a BM8563 model. When the clock chip is working normally, it can record time information.
[0031] The controller is connected to a power interface to supply power, and also to a clock chip to obtain time information. As an example, the controller could be an MCU (Microcontroller Unit).
[0032] The motor drive circuit is connected to a power interface for power supply and also to a controller to control its operation. Specifically, the controller can drive the motor drive circuit based on time information, such as activating it at preset time intervals. In the pump, the motor drive circuit drives the impeller to rotate, thereby pumping the fluid. It should be noted that the specific structure of the motor drive circuit is prior art and will not be described further here.
[0033] The supercapacitor is connected between the charging control unit and the clock chip. When the power interface is not connected to a power source, the supercapacitor can supply power to the clock chip to ensure that the clock chip is always in working condition. As an example, the supercapacitor specification can be 1F_5.5V.
[0034] The charging control unit is connected between the power interface and the supercapacitor, and also to the controller. The controller can control the charging control unit to be turned on or off. When the charging control unit is on, the power interface and the supercapacitor are connected, and the power supply can charge the supercapacitor. When the charging control unit is off, the power supply cannot charge the supercapacitor. The controller can control the on and off of the charging control unit based on time information. For example, the controller can turn on the charging control unit for a certain period of time every preset time interval (e.g., 240 hours) to ensure that the supercapacitor's charge level is higher than a preset value. By reasonably arranging the charging sequence of the supercapacitor, voltage stability and a longer service life can be achieved, while avoiding unnecessary power loss. The service life of a supercapacitor is mainly reflected in the number of charge-discharge cycles. The lifespan is affected by the magnitude of the charge-discharge current. With a reasonable charging arrangement, multiple charge-discharge cycles can be avoided, and the magnitude of the charging current can be controlled to achieve a longer service life.
[0035] Figure 2 A circuit diagram of a first power supply system according to an embodiment of this application is shown. Figure 2 As shown, the clock chip includes a VDD pin. The VDD pin is connected to a power interface so that the power supply can power the clock chip. Furthermore, a first unidirectional conductor D3 is provided between the power interface and the VDD pin to allow current from the power interface to flow unidirectionally from the power interface to the VDD pin. As an example, the first unidirectional conductor D3 can be a diode.
[0036] like Figure 2As shown, the clock chip also includes a CLKOUT pin, an SCL pin, and an SDA pin. The CLKOUT pin is connected to the power interface via a first pull-up resistor R5. The operating frequency of the clock chip can be detected through the CLKOUT pin. The SCL pin is connected to the power interface via a second pull-up resistor R6. The SDA pin is connected to the power interface via a third pull-up resistor R7. The SCL and SDA pins are connected to the controller, allowing the controller to communicate with the clock chip.
[0037] like Figure 2 As shown, supercapacitor E2 includes a positive terminal and a negative terminal. The negative terminal is grounded. The positive terminal is connected in parallel with the power interface to the VDD pin, and a second unidirectional conductor D4 is provided between the positive terminal and the VDD pin to allow current from supercapacitor E2 to flow unidirectionally from the positive terminal of supercapacitor E2 to the VDD pin. As an example, the second unidirectional conductor D4 can be a diode.
[0038] By setting the first unidirectional conductor D3 and the second unidirectional conductor D4, it is ensured that the current from the power interface can only flow unidirectionally to the VDD pin and not to the positive terminal of the supercapacitor E2. At the same time, it is also ensured that the current from the supercapacitor E2 flows unidirectionally to the VDD pin and not to the power interface.
[0039] like Figure 2 As shown, the charging control unit includes a transistor Q1. The first conducting terminal of transistor Q1 is connected to the power interface, the second conducting terminal of transistor Q1 is connected to the positive terminal of supercapacitor E2, and the base of transistor Q1 is connected to the control terminal of the controller. The controller controls the transistor Q1 to turn on and off at set time intervals through the control terminal. When transistor Q1 is on, the power supply can charge supercapacitor E2; when transistor Q1 is off, the power supply cannot charge supercapacitor E2.
[0040] As an example, Figure 2 Transistor Q1 in the diagram is a PNP transistor. The first conducting terminal is the emitter, and the second conducting terminal is the collector. When the control terminal outputs a low-level signal, the PNP transistor conducts; when the control terminal outputs a high-level signal, the PNP transistor is turned off. For example, the PNP transistor specification could be 8550SOT-23.
[0041] like Figure 2 As shown, the charging control unit also includes a first current limiting element R3, through which the base is connected to the control terminal. As an example, the first current limiting element R3 is a resistor, with a specification of 1K 1% 0603.
[0042] like Figure 2As shown, the charging control unit also includes a second current-limiting element R4, through which the second conducting terminal is connected to the positive terminal of the supercapacitor E2. As an example, the second current-limiting element R4 is a resistor with a specification of 4.7K 1% 0603. The second current-limiting element R4 is used to limit the current flowing to the supercapacitor E2.
[0043] like Figure 2 As shown, the charging control unit also includes a biasing component R2, which is connected between the power interface and the base. The biasing resistor is used to bias the voltage at the base. Figure 2 In this configuration, the bias component R2 is a pull-up resistor to prevent the PNP transistor from accidentally conducting. The specification for the bias component R2 can be 5.1 1% 2512.
[0044] like Figure 2 As shown, the power supply system also includes a filter capacitor C10. One end of the filter capacitor C10 is connected to the power interface. Specifically, it can be connected to the common negative terminal of the first unidirectional conductor D3 and the second unidirectional conductor D4. The other end of the filter capacitor C10 is grounded.
[0045] The maximum charging current of supercapacitor E2 is I_max = VCC / R4 = 5V / 4700Ω ≈ 0.1A
[0046] The charging time of supercapacitor E2 is T = C * U / I = 0.9 F * 5 V / 0.1 A = 45 s.
[0047] That is, the estimated maximum charging current is 0.1A, the charging time is at least 45s, and the duration of each charge is 120s to ensure that the supercapacitor E2 is fully charged.
[0048] Figure 3 A schematic diagram of a second power supply system according to an embodiment of this application is shown. It should be noted that... Figure 3 Zhongyu Figure 2 A similar structure can be found in the previous text. Figure 2 The description will not be repeated here.
[0049] like Figure 3 As shown, transistor Q1 is an NPN transistor. The first conducting terminal is the collector of the NPN transistor, and the second conducting terminal is the emitter of the NPN transistor. When the control terminal outputs a high-level signal, the NPN transistor is turned on, and when the control terminal outputs a low-level signal, the NPN transistor is turned off.
[0050] like Figure 3 As shown, one end of the biasing component R2 is connected to the base of transistor Q1, and the other end of the biasing component R2 is grounded. The biasing component R2 is used to bias the base voltage. Figure 3 In the middle, the bias component R2 is a pull-down resistor to prevent the NPN transistor from being mis-converted.
[0051] like Figure 3 As shown, one end of the second current limiting component R4 is connected to the power interface, and the other end of the second current limiting component R4 is connected to the collector of the NPN transistor. The second current limiting component R4 is used to limit the current flowing to the supercapacitor E2.
[0052] This application also relates to pumps, which include the power supply system described above.
[0053] Although this application has been described in detail above with general descriptions, specific embodiments, and experiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this application fall within the scope of protection claimed in this application.
Claims
1. A power supply system for a control circuit, characterized in that, include: Power interface; A clock chip, including a VDD pin, wherein the VDD pin is connected to the power interface; A first unidirectional conduction element is disposed between the power interface and the VDD pin to allow current from the power interface to flow unidirectionally from the power interface to the VDD pin. A supercapacitor includes a positive terminal and a negative terminal, wherein the positive terminal is connected in parallel with the power interface to the VDD pin, and the negative terminal is grounded; A second unidirectional conduction element is disposed between the positive terminal of the supercapacitor and the VDD pin, so that the current from the supercapacitor flows unidirectionally from the positive terminal of the supercapacitor to the VDD pin; A controller, connected to the clock chip and the power interface, and including a control terminal; A charging control unit includes a transistor, wherein the first conducting terminal of the transistor is connected to the power interface, the second conducting terminal of the transistor is connected to the positive terminal of the supercapacitor, and the base of the transistor is connected to the control terminal. The controller controls the transistor to turn on and off at set time intervals through the control terminal.
2. The power supply system according to claim 1, characterized in that, The transistor is a PNP transistor. The first conducting terminal is the emitter of the PNP transistor, and the second conducting terminal is the collector of the PNP transistor. When the control terminal outputs a low-level signal, the PNP transistor is turned on, and when the control terminal outputs a high-level signal, the PNP transistor is turned off.
3. The power supply system according to claim 2, characterized in that, The charging control unit also includes: A biasing component, one end of which is connected to the power interface and the other end of which is connected to the base.
4. The power supply system according to claim 1, characterized in that, The transistor is an NPN transistor. The first conducting terminal is the collector of the NPN transistor, and the second conducting terminal is the emitter of the NPN transistor. When the control terminal outputs a high-level signal, the NPN transistor is turned on, and when the control terminal outputs a low-level signal, the NPN transistor is turned off.
5. The power supply system according to claim 4, characterized in that, The charging control unit also includes: A biasing component, one end of which is connected to the base and the other end of which is grounded.
6. The power supply system according to any one of claims 1 to 5, characterized in that, The charging control unit also includes: The first current limiting device is used to connect the base to the control terminal.
7. The power supply system according to any one of claims 1 to 5, characterized in that, The charging control unit also includes: The second current limiting device is disposed between the power interface and the first conducting electrode, or the second current limiting device is disposed between the second conducting electrode and the positive electrode of the supercapacitor.
8. The power supply system according to any one of claims 1 to 5, characterized in that, The power supply system also includes: A filter capacitor, one end of which is connected to the power interface and the other end of which is grounded.
9. The power supply system according to any one of claims 1 to 5, characterized in that, The controller is an MCU.
10. A pump, characterized in that, The pump includes the power supply system according to any one of claims 1 to 9.