A power supply system based on multiple power sources

Abstract

The embodiment of the present application discloses a power supply system based on multiple power supplies. The technical solution provided by the embodiment of the present application includes two power supplies for powering the system, wherein the first power supply is used to power the back-end equipment and charge the supercapacitor, and the second power supply is used to power the back-end equipment when the first power supply and the supercapacitor fail; the first power supply is connected to the first end of the supercapacitor and the back-end equipment; the first end of the supercapacitor is connected to the back-end equipment, and the second end is grounded; the second power supply is connected to the back-end equipment. The technical solution provided by the embodiment of the present application can solve the problem of high current consumption in the multi-power supply system, improve the power supply stability of the power supply system and save electricity.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of power supply systems, and in particular to a power supply system based on multiple power sources. Background Art

[0002] With the development of economy and culture, my country's power industry has developed rapidly, the power structure has been continuously adjusted, and the power equipment technology has been continuously improved. With the development of economy and culture, the demand for electricity has become more vigorous. With the rapid development of communication technology today, the energy-saving role of power products is particularly important.

[0003] At present, most power supply systems on the market use lithium batteries as backup power sources, but lithium batteries are prone to leakage, fire and other major safety issues. In addition, the normal service life of lithium batteries is 3 to 5 years, which does not match the long-term life of devices such as doors or doorbells. Batteries need to be replaced frequently, and it is difficult to buy matching batteries on the market. Finally, due to the limitation of the number of charge and discharge times of lithium batteries, most smart doors currently need to unplug the battery for charging and then install it on devices such as doors or doorbells, which is extremely inconvenient to use. At present, air transport products cannot carry lithium batteries, and lithium batteries and products need to be transported separately, resulting in the need to wait for the lithium batteries to arrive before the product can be officially used.

[0004] Based on this, a small number of manufacturers have begun to consider using a multi-power supply system, but the system consumes a large amount of current, and if a battery is used as a power supply, the battery standby time is short. Summary of the invention

[0005] The embodiment of the present application provides a power supply system based on multiple power sources, which can solve the problem of high current consumption in the power supply system with multiple power sources, improve the power supply stability of the power supply system and save electricity.

[0006] In a first aspect, an embodiment of the present application provides a power supply system based on a multi-power supply, including two power supplies for powering the system, wherein the first power supply is used to power a back-end device and charge a supercapacitor, and the second power supply is used to power the back-end device when a failure occurs between the first power supply and the supercapacitor;

[0007] The first power supply is connected to the first end of the supercapacitor and the back-end device;

[0008] A first end of the supercapacitor is connected to the back-end device, and a second end is grounded;

[0009] The second power supply is connected to the back-end equipment.

[0010] Furthermore, the first power supply is connected to the first end of the supercapacitor and the back-end device, specifically:

[0011] The first power supply is connected to the positive electrode of the first diode, the negative electrode of the first diode is connected to the positive electrode of the second diode, the negative electrode of the second diode is connected to the first end of the first resistor, and the second end of the first resistor is connected to the first end of the supercapacitor and the back-end device.

[0012] Further, the first end of the supercapacitor is connected to the back-end device, specifically:

[0013] The first end of the super capacitor is connected to the anode of the third diode, and the cathode of the third diode is connected to the back-end device.

[0014] Furthermore, the second power supply is connected to the back-end device, specifically:

[0015] The second power supply is connected to the first end of the second resistor, the second end of the second resistor is connected to the positive end of the third power supply, the negative electrode of the third power supply is grounded, the second end of the second resistor is connected to the positive electrode of the fourth diode, the negative electrode of the fourth diode is connected to the back-end device and the first end of the first capacitor, and the second end of the first capacitor is grounded.

[0016] Furthermore, the system also includes:

[0017] The cathode of the first diode is connected to the anode of the fifth diode, and the cathode of the fifth diode is connected to the cathode of the fourth diode, a back-end device, and a first end of the first capacitor.

[0018] Furthermore, the system also includes:

[0019] The output voltage of the first power supply is 3.3V, and the output voltage of the second power supply and the third power supply is 3V;

[0020] The voltage drops of the first diode, the second diode and the third diode are all 0.15V;

[0021] The voltage drop of the fourth diode and the fifth diode is 0.2V.

[0022] Furthermore, the system also includes:

[0023] The first resistor is a fixed resistor with a resistance of 56Ω;

[0024] The second resistor is an adjustable resistor.

[0025] Furthermore, the system also includes:

[0026] The capacitance of the first capacitor is 0.1uF, and the rated voltage is 16V.

[0027] Furthermore, the system also includes:

[0028] The models of the first diode, the second diode and the third diode are IN4148WS and SOD-323.

[0029] Furthermore, the system also includes:

[0030] The models of the fourth diode and the fifth diode are BAV74 and SOT-23.

[0031] The embodiment of the present application is powered by two power supplies, and the first power supply is used to directly power the back-end device and charge the super capacitor at the same time, so that when the first power supply fails, the power stored in the super capacitor can be used to power the back-end device, thereby improving the stability of the system power supply. In addition, a second power supply is provided, and when both the first power supply and the super capacitor fail, the back-end device can be powered by the second power supply, thereby further improving the stability of the system power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of a power supply system based on multiple power supplies provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application clearer, the specific embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, rather than to limit the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Figure 1 A schematic diagram of a power supply system based on multiple power supplies provided in an embodiment of the present application is given. Figure 1The power supply system based on multiple power supplies includes two power supplies for supplying power to the system, wherein the first power supply VRTC1 is used to supply power to the back-end device VRTC2 and charge the super capacitor C1, and the second power supply VBAT is used to supply power to the back-end device VRTC2 when a failure occurs between the first power supply VRTC1 and the super capacitor C1; the first power supply VRTC1 is connected to the first end of the super capacitor C1 and the back-end device VRTC2; the first end of the super capacitor C1 is connected to the back-end device VRTC2, and the second end is grounded; the second power supply VBAT is connected to the back-end device VRTC2.

[0036] Specifically, the first power supply VRTC1 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the positive electrode of the second diode D2, the negative electrode of the second diode D2 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the first end of the super capacitor C1 and the back-end device VRTC2. The first end of the super capacitor C1 is connected to the positive electrode of the third diode D3, and the negative electrode of the third diode D3 is connected to the back-end device VRTC2. The first power supply VRTC1 directly supplies power to the back-end device VRTC2 while charging the super capacitor C1. When the first power supply VRTC1 fails and loses power, the super capacitor C1 discharges to supply power to the back-end device VRTC2. In addition, because the first diode D1 and the second diode D2 are provided, the current of the super capacitor C1 can be prevented from flowing back to the first power supply VRTC1 when it is discharged, thereby improving the stability of the super capacitor C1 supplying power to the back-end device VRTC2.

[0037] Further, the second power supply VBAT is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the positive end of the third power supply VBT1, the negative end of the third power supply VBT1 is grounded, the second end of the second resistor R2 is connected to the positive end of the fourth diode D4, the negative end of the fourth diode D4 is connected to the back-end device VRTC2 and the first end of the first capacitor C2, and the second end of the first capacitor C2 is grounded. The negative end of the first diode D1 is connected to the positive end of the fifth diode D5, and the negative end of the fifth diode D5 is connected to the negative end of the fourth diode D4, the back-end device VRTC2, and the first end of the first capacitor C2. The third power supply VBT1 is a lithium battery, which can independently power the back-end device.

[0038] In one embodiment, the first resistor R1 is a fixed resistor with a resistance of 56Ω; the second resistor R2 is an adjustable resistor. When the second power supply VBAT does not need to be connected, the resistance of the second resistor R2 is adjusted to infinity so that the circuit is not conductive, and the second power supply VBAT cannot be connected to the subsequent circuit, thereby failing to supply power to the back-end device VRTC2. When the second power supply VBAT is connected as a backup power supply according to actual needs, the resistance of the second resistor R2 is adjusted to 0, so that the second power supply VBAT can be connected to the subsequent circuit, thereby supplying power to the back-end device VRTC2.

[0039] In one embodiment, the output voltage of the first power supply VRTC1 is 3.3V, the output voltage of the second power supply VBAT and the third power supply VBT1 is 3V; the voltage drops of the first diode D1, the second diode D2 and the third diode D3 are all 0.15V; the voltage drops of the fourth diode D4 and the fifth diode D5 are 0.2V. Therefore, the voltage at point A is 3.15V, the voltage at point B is 3V, the voltage drop of the resistor R1 is 0.015V, and the voltage at point C is 2.985V. Therefore, based on the principle that the current in the circuit flows from high voltage to low voltage, when the first power supply VRTC1 is used normally, the first power supply VRTC1 flows through the first diode D1 and the fifth diode D5 to the back-end device VRTC2 for direct power supply, and charges the super capacitor C1. When the first power supply VRTC1 fails, the voltage value is 2.835V after the voltage drop of 0.15V through the third diode D3 based on the voltage of 2.985V at point C; and then the voltage is 2.8V after the voltage drop of 0.2V through the fourth diode D4 based on the voltage of 3V at point D. Therefore, when the first power supply VRTC1 fails, the super capacitor C1 will be discharged to the back-end device VRTC2 first. Furthermore, when both the first power supply VRTC1 and the super capacitor C1 fail, the back-end device VRTC2 will be powered by the second power supply VBAT or the third power supply VBT1.

[0040] In one embodiment, the capacitance of the first capacitor C2 is 0.1uF and the rated voltage is 16V. The models of the first diode D1, the second diode D2 and the third diode D3 are IN4148WS, SOD-323. The models of the fourth diode D4 and the fifth diode D5 are BAV74, SOT-23. The resistance value of the resistor R1 is 56Ω.

[0041] At present, products shipped by air cannot carry lithium batteries. Lithium batteries and products need to be transported separately. Products will be delivered to the place of use first by air, while lithium batteries cannot be transported by air and will arrive later. Existing products need to wait for the arrival of lithium batteries before they can be officially used. The products in the embodiments of the present application use supercapacitors for power supply. Supercapacitors are not subject to air transportation restrictions. Therefore, the products with supercapacitors in the embodiments of the present application will arrive at the place of use first. When the lithium battery is not delivered in time, the supercapacitor can be used as a backup power supply for normal use. When the lithium battery is delivered later, the lithium battery can be installed, so that the product has an additional backup power supply, which further improves the stability of the power supply.

[0042] At present, a small number of manufacturers have begun to consider using a multi-power supply system, but the system consumes a lot of current. If batteries are used as power supplies, the battery standby time is short and it is troublesome to replace the battery. When lithium batteries and supercapacitors are powered at the same time, supercapacitors can provide users with a long time to power on the equipment, avoiding the consumption of lithium battery power and ensuring that lithium batteries can be used for a longer time. At the same time, when lithium batteries are not used, products can be shipped to the market faster by air, and supercapacitors can also maintain power supply for a considerable period of time. When the system is temporarily powered off, it can keep the system working until it is powered on again.

[0043] As described above, power is supplied through three power supplies, and the first power supply VRTC1 is used to directly supply power to the back-end device VRTC2 while charging the super capacitor C1, so that when the first power supply VRTC1 fails, the power stored in the super capacitor C1 can be used to supply power to the back-end device VRTC2, thereby improving the stability of the system power supply. In addition, a second power supply VBAT and a third power supply VBT1 are provided, and when both the first power supply VRTC1 and the super capacitor fail, the back-end device VRTC2 can be supplied with power through the second power supply VBAT or the third power supply VBT1, thereby further improving the stability of the system power supply.

[0044] The above are only preferred embodiments of the present application and the technical principles used. The present application is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions that can be made by those skilled in the art will not deviate from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A power supply system based on multiple power sources, characterized in that: include: Two power supplies are used to power the system, wherein the first power supply is used to power the back-end equipment and charge the supercapacitor, and the second power supply is used to power the back-end equipment when the first power supply and the supercapacitor fail; The first power supply is connected to the first end of the supercapacitor and the back-end device; A first end of the supercapacitor is connected to the back-end device, and a second end is grounded; The second power supply is connected to the back-end device; The first power supply is connected to the first end of the supercapacitor and the back-end device, specifically: The first power supply is connected to the positive electrode of the first diode, the negative electrode of the first diode is connected to the positive electrode of the second diode, the negative electrode of the second diode is connected to the first end of the first resistor, and the second end of the first resistor is connected to the first end of the supercapacitor and the back-end device; The first end of the supercapacitor is connected to the back-end device, specifically: The first end of the supercapacitor is connected to the anode of the third diode, and the cathode of the third diode is connected to the back-end device; The second power supply is connected to the back-end device, specifically: The second power supply is connected to the first end of the second resistor, the second end of the second resistor is connected to the positive end of the third power supply, the negative electrode of the third power supply is grounded, the second end of the second resistor is connected to the positive electrode of the fourth diode, the negative electrode of the fourth diode is connected to the back-end device and the first end of the first capacitor, and the second end of the first capacitor is grounded; The second resistor is an adjustable resistor; The system further comprises: The cathode of the first diode is connected to the anode of the fifth diode, and the cathode of the fifth diode is connected to the cathode of the fourth diode, the back-end device, and the first end of the first capacitor; The system further comprises: The output voltage of the first power supply is 3.3V, and the output voltage of the second power supply and the third power supply is 3V; The voltage drops of the first diode, the second diode and the third diode are all 0.15V; The voltage drop of the fourth diode and the fifth diode is 0.2V; When the first power supply fails, the super capacitor discharges to supply power to the back-end equipment; When both the first power supply and the super capacitor fail, the back-end device is powered by the second power supply or the third power supply.

2. The power supply system based on multiple power sources according to claim 1, characterized in that: The system further comprises: The first resistor is a fixed resistor with a resistance of 56Ω.

3. The power supply system based on multiple power sources according to claim 2, characterized in that: The system further comprises: The capacitance of the first capacitor is 0.1uF, and the rated voltage is 16V.

4. The power supply system based on multiple power sources according to claim 3, characterized in that: The system further comprises: The models of the first diode, the second diode and the third diode are IN4148WS and SOD-323.

5. The power supply system based on multiple power sources according to claim 3, characterized in that: The system further comprises: The models of the fourth diode and the fifth diode are BAV74 and SOT-23.

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