Dual-power switching circuit
By using the dual power switching circuit of the MOS tube switch module and the power output module in dual power electronic products, the problems of large power switching losses, high prices and poor stability in the existing technology are solved, and efficient and stable power switching is achieved. Suitable for miniaturization equipment.
Patent Information
- Application Number
- CN202421055182.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-05-15
Smart Images
Figure CN222508884U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power switching, in particular to a dual power switching circuit. Background Art
[0002] With the continuous technological innovation in the field of mobile payment in the financial industry, new POS machines on the market can provide diversified, multi-channel, and multi-media interaction methods. Their smaller size and lower price are increasingly recognized by the market. POS machines need to have both external power supply and battery power supply, and switch between external power supply and battery power supply. As a dual-power electronic product, how to achieve stable and reliable power switching of dual-power electronic products is the technical key of dual-power electronic products.
[0003] In the existing automatic switching technology, relays or contactors are used for switching. However, the use of relays to switch between two power sources has large power loss and high price, and needs to be controlled by a single-chip microcomputer in conjunction with a voltage detection circuit, which is not conducive to the miniaturization of POS machines. Alternatively, two diodes are used to connect the two power sources in parallel, but due to the voltage drop of the diodes themselves, voltage loss will occur. The above solutions will cause power loss and waste. For high-power or low-power, long-standby products, the battery energy cannot be fully utilized, and the power supply stability is poor. Utility Model Content
[0004] The main purpose of the utility model is to provide a dual power supply switching circuit, aiming to solve the problems of large loss, high price, poor power supply stability, and disadvantageous product miniaturization in the power automatic switching technology of existing dual power supply electronic products.
[0005] To achieve the above object, the utility model provides a dual power switching circuit, including: a MOS tube switch module and a power output module; wherein,
[0006] The first end of the MOS tube switch module is connected to the first power supply, the second end of the MOS tube switch module is connected to the second power supply, and the third end of the MOS tube switch module is connected to the input end of the power output module; wherein, the MOS tube switch module includes three MOS tubes and four resistors, the first power supply is the external input power supply of the POS machine, and the second power supply is the internal battery power supply of the POS machine; the MOS tube switch module is used to realize automatic switching between the first power supply and the second power supply through the MOS tube.
[0007] In some embodiments, the MOS transistor switch module includes: a first MOS transistor, a second MOS transistor and a third MOS transistor; wherein,
[0008] The first end of the first MOS transistor is connected to the first power supply, the second end of the first MOS transistor is connected to the input end of the power output module, and the third end of the first MOS transistor is connected to the second power supply;
[0009] The first end of the second MOS tube is connected to the second power supply, the second end of the second MOS tube is connected to the input end of the power output module, and the third end of the second MOS tube is connected to the third MOS tube;
[0010] The first end of the third MOS tube is connected to the second power supply, the second end of the third MOS tube is respectively connected to the input end of the power output module and the third end of the second MOS tube, and the third end of the third MOS tube is grounded.
[0011] In some embodiments, the first MOS transistor and the second MOS transistor are P-channel type MOS transistors, and the third MOS transistor is an N-channel type MOS transistor.
[0012] In some embodiments, the MOS switch module includes a first resistor, a second resistor, a third resistor and a fourth resistor; wherein,
[0013] The first end of the first resistor is connected to the first end of the second resistor and the gate of the first MOS transistor respectively, and the second end of the first resistor is grounded;
[0014] The first end of the second resistor is also connected to the second power supply and the drain of the second MOS tube respectively, and the second end of the second resistor is connected to the gate of the third MOS tube;
[0015] The first end of the third resistor is connected to the second power supply and the first end of the second resistor respectively, and the second end of the third resistor is grounded;
[0016] The first end of the fourth resistor is respectively connected to the gate of the second MOS tube and the drain of the third MOS tube, and the second end of the fourth resistor is respectively connected to the input end of the power output module and the source of the second MOS tube.
[0017] In some embodiments, when the first power supply is supplying power and the second power supply is not supplying power, the power output module is connected to the first power supply through the MOS tube switch module to output the voltage of the first power supply.
[0018] In some embodiments, in the MOS transistor switch module, the first MOS transistor is turned on, and the second MOS transistor and the third MOS transistor are turned off.
[0019] In some embodiments, when the second power supply is supplying power and the first power supply is not supplying power, the power output module is connected to the second power supply through the MOS switch module to output the voltage of the second power supply.
[0020] In some embodiments, when the first power supply is powered and the second power supply is powered, the power output module is connected to the second power supply through the MOS tube switch module to output the voltage of the second power supply.
[0021] In some embodiments, the second MOS tube and the third MOS tube in the MOS tube switch module are turned on, and the first MOS tube is turned off.
[0022] In some embodiments, the static power consumption of the dual power switching circuit is at the microampere current level.
[0023] The utility model proposes a dual power switching circuit, including: a MOS tube switch module and a power output module; wherein the first end of the MOS tube switch module is connected to the first power supply, the second end of the MOS tube switch module is connected to the second power supply, and the third end of the MOS tube switch module is connected to the input end of the power output module; wherein the MOS tube switch module includes three MOS tubes and four resistors, the first power supply is the external input power supply of the POS machine, and the second power supply is the internal battery power supply of the POS machine; the MOS tube switch module is used to realize the automatic switching of the first power supply and the second power supply through the MOS tube. In the utility model, MOS tubes are used to realize the switching of two power supplies to realize the switching of power supply paths, and the switching of two power supplies is realized with the maximum efficiency by turning on and off the three MOS tubes, realizing the dual power switching, with low loss and high power supply stability, solving the problems of large loss, high price, poor power supply stability, and unfavorable product miniaturization in the power automatic switching technology of existing dual power electronic products. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a module schematic diagram of a dual power switching circuit involved in an embodiment of the utility model;
[0025] Figure 2 It is a circuit structure schematic diagram of a dual power supply switching circuit involved in an embodiment of the utility model.
[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0029] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model. It should be understood that the specific embodiments described here are only used to explain the present utility model and are not used to limit the present utility model.
[0030] The utility model provides a dual power supply switching circuit.
[0031] Reference Figure 1 , Figure 1 It is a module schematic diagram of a dual power switching circuit involved in an embodiment of the utility model.
[0032] like Figure 1 As shown, the dual power switching circuit includes: a MOS tube switch module 100 and a power output module 200; wherein,
[0033] The first end of the MOS tube switch module 100 is connected to the first power supply Vin1, the second end of the MOS tube switch module 100 is connected to the second power supply Vin2, and the third end of the MOS tube switch module 100 is connected to the input end of the power output module 200; wherein, the MOS tube switch module 100 includes three MOS tubes and four resistors, the first power supply Vin1 is the external input power supply of the POS machine, and the second power supply Vin2 is the internal battery power supply of the POS machine; the MOS tube switch module 100 is used to realize automatic switching of the first power supply Vin1 and the second power supply Vin2 through the MOS tube.
[0034] It should be noted that this embodiment is described by taking a dual-power electronic product as a POS device as an example. The POS device includes the dual-power switching circuit proposed in this embodiment, and the POS device uses the dual-power switching circuit to perform power switching to improve the power stability and reliability of the dual-power electronic product.
[0035] In one embodiment, the MOS transistor switch module 100 includes: a first MOS transistor Q1, a second MOS transistor Q2 and a third MOS transistor Q3; wherein,
[0036] The first end of the first MOS transistor Q1 is connected to the first power supply Vin1, the second end of the first MOS transistor Q1 is connected to the input end of the power output module 200, and the third end of the first MOS transistor Q1 is connected to the second power supply Vin2;
[0037] The first end of the second MOS transistor Q2 is connected to the second power supply Vin2, the second end of the second MOS transistor Q2 is connected to the input end of the power output module 200, and the third end of the second MOS transistor Q2 is connected to the third MOS transistor Q3;
[0038] The first end of the third MOS transistor Q3 is connected to the second power supply Vin2, the second end of the third MOS transistor Q3 is respectively connected to the input end of the power output module 200 and the third end of the second MOS transistor Q2, and the third end of the third MOS transistor Q3 is grounded.
[0039] Specifically, this embodiment is described by taking the first MOS transistor Q1 and the second MOS transistor Q2 as P-channel type MOS transistors, and the third MOS transistor Q3 as N-channel type MOS transistor. In this embodiment, by using MOS transistors for dual power switching, compared with the prior art, dual power switching is achieved, and the loss is low and the power supply stability is high.
[0040] For example, the model of the first MOS tube Q1 may be LP2307LT1G (P channel), the model of the second MOS tube Q2 may be LP2307LT1G (P channel), and the model of the third MOS tube Q3 may be JMTL3134KT5 (N channel). It can be understood that the specific types of the first MOS tube Q1, the second MOS tube Q2, and the third MOS tube Q3 can be set according to actual conditions, and this embodiment does not limit this.
[0041] In one embodiment, the MOS transistor switch module 100 includes a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4; wherein the first end of the first resistor R1 is respectively connected to the first end of the second resistor R2 and the gate of the first MOS transistor Q1, and the second end of the first resistor R1 is grounded; the first end of the second resistor R2 is also respectively connected to the second power supply Vin2 and the drain of the second MOS transistor Q2, and the second end of the second resistor R2 is connected to the gate of the third MOS transistor Q3; the first end of the third resistor R3 is respectively connected to the second power supply Vin2 and the first end of the second resistor R2, and the second end of the third resistor R3 is grounded; the first end of the fourth resistor R4 is respectively connected to the gate of the second MOS transistor Q2 and the drain of the third MOS transistor Q3, and the second end of the fourth resistor R4 is respectively connected to the input end of the power output module 200 and the source of the second MOS transistor Q2.
[0042] Specifically, the MOS transistor switch module 100 of this embodiment includes: a first MOS transistor Q1, a second MOS transistor Q2 and a third MOS transistor Q3, and a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. In this embodiment, the power supply path switching is realized by using MOS transistors and resistors to realize the switching of two power supplies. When there is a first power supply (such as a main power supply), the static power consumption of the dual power supply switching circuit is at the microampere uA level, and the switching of the two power supplies can be realized with maximum efficiency.
[0043] For example, the resistance of the first resistor R1 may be 100K (ohm), the resistance of the second resistor R2 may be 1K (ohm), the resistance of the third resistor R3 may be 100K (ohm), and the resistance of the fourth resistor R4 may be 100K (ohm). It is understood that the specific resistance values of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 may be set according to actual conditions, and this embodiment does not limit this.
[0044] In one example, when the first power supply Vin1 is powered and the second power supply Vin2 is not powered, the power output module 200 is connected to the first power supply Vin1 through the MOS tube switch module 100 to output the voltage of the first power supply Vin1; wherein the first MOS tube Q1 in the MOS tube switch module 100 is turned on, and the second MOS tube Q2 and the third MOS tube Q3 are turned off.
[0045] Specifically, Figure 2As shown, when the first power supply Vin1 supplies power and the second power supply Vin2 does not supply power, the third MOS tube Q3 is turned off, the gate (G pole) of the first MOS tube Q1 is pulled down by the first resistor R1, so the first MOS tube Q1 is turned on, and the gate of the second MOS tube Q2 is pulled up by the fourth resistor R4, so the second MOS tube Q2 is also turned off. In this example, in the entire dual power switching circuit, the second MOS tube Q2 and the third MOS tube Q3 are turned off, and the output voltage Vout of the power output module 200 is powered by the first power supply Vin1, Vout = Vin1, and at this time, the static power consumption flowing through the second MOS tube Q2 and the third MOS tube Q3 does not exist.
[0046] In another example, when the second power supply Vin2 is powered and the first power supply Vin1 is not powered, the power output module 200 is connected to the second power supply Vin2 through the MOS switch module 100 to output the voltage of the second power supply Vin2. Here, the static power consumption of the dual power switching circuit is at the microampere current level.
[0047] Specifically, Figure 2 As shown, when the second power supply Vin2 supplies power and the first power supply Vin1 does not supply power, the third MOS tube Q3 is turned on, and then the gate (G pole) of the second MOS tube Q2 is pulled down, and then the second MOS tube Q2 also starts to conduct. At this time, the voltage between the gate (G pole) and the source (S pole) of the first MOS tube Q1 is the conduction voltage drop of the second MOS tube Q2, which is about tens of mV. Therefore, the first MOS tube Q1 is turned off, and the external power supply, that is, the first power supply Vin1, is disconnected. At this time, regardless of whether the first power supply Vin1 supplies power, the drain (D pole) voltage of the first MOS tube Q1 is not provided by the first power supply Vin1. At this time, the output voltage Vout of the power output module 200 is powered by the second power supply Vin2, and Vout=Vin2. At this time, in this example, the static power consumption of the entire dual power switching circuit is close to the microampere uA level.
[0048] In another example, when the first power supply Vin1 supplies power and the second power supply Vin2 supplies power, the power output module 200 is connected to the second power supply Vin2 through the MOS transistor switch module 100, and outputs the voltage of the second power supply Vin2; wherein the second MOS transistor Q2 and the third MOS transistor Q3 in the MOS transistor switch module 100 are turned on, and the first MOS transistor Q1 is turned off. Here, the static power consumption of the dual power switching circuit is at the microampere current level.
[0049] Specifically, Figure 2As shown, when the first power supply Vin1 and the second power supply Vin2 are powered at the same time, it can be seen from the analysis of the above example that at this time, the third MOS tube Q3 and the second MOS tube Q2 are turned on, and the first MOS tube Q1 is turned off, and the external power supply, that is, the first power supply Vin1, cannot supply the output voltage Vout of the power output module 200. The output voltage Vout of the power output module 200 is powered by the second power supply Vin2, and Vout=Vin2. At this time, in this example, the static power consumption of the entire dual power switching circuit is close to the microampere uA level.
[0050] It should be noted that one of the major advantages of the dual power switching circuit in this embodiment is that there is almost no voltage drop in the entire dual power switching circuit, and the switching of the two power supplies is achieved with maximum efficiency through the conduction and cutoff of the three MOS tubes.
[0051] It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present invention. In specific applications, technicians in this field can make settings as needed, and the present invention does not impose any limitation on this.
[0052] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present utility model. In practical applications, technicians in this field can select part or all of them according to actual needs to achieve the purpose of the present embodiment, and no limitation is made here.
[0053] In addition, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, article or system. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, article or system including the element.
[0054] The serial numbers of the above-mentioned embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.
[0055] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A dual power switching circuit, characterized in that: include: MOS tube switch module and power output module; among which, The first end of the MOS tube switch module is connected to the first power supply, the second end of the MOS tube switch module is connected to the second power supply, and the third end of the MOS tube switch module is connected to the input end of the power output module; wherein, the MOS tube switch module includes three MOS tubes and four resistors, the first power supply is the external input power supply of the POS machine, and the second power supply is the internal battery power supply of the POS machine; the MOS tube switch module is used to realize automatic switching between the first power supply and the second power supply through the MOS tube.
2. The circuit according to claim 1, characterized in that The MOS transistor switch module includes: a first MOS transistor, a second MOS transistor and a third MOS transistor; wherein, The first end of the first MOS transistor is connected to the first power supply, the second end of the first MOS transistor is connected to the input end of the power output module, and the third end of the first MOS transistor is connected to the second power supply; The first end of the second MOS tube is connected to the second power supply, the second end of the second MOS tube is connected to the input end of the power output module, and the third end of the second MOS tube is connected to the third MOS tube; The first end of the third MOS tube is connected to the second power supply, the second end of the third MOS tube is respectively connected to the input end of the power output module and the third end of the second MOS tube, and the third end of the third MOS tube is grounded.
3. The circuit according to claim 2, characterized in that The first MOS transistor and the second MOS transistor are P-channel type MOS transistors, and the third MOS transistor is an N-channel type MOS transistor.
4. The circuit according to claim 2, characterized in that The MOS switch module includes a first resistor, a second resistor, a third resistor and a fourth resistor; wherein, The first end of the first resistor is connected to the first end of the second resistor and the gate of the first MOS transistor respectively, and the second end of the first resistor is grounded; The first end of the second resistor is also connected to the second power supply and the drain of the second MOS tube respectively, and the second end of the second resistor is connected to the gate of the third MOS tube; The first end of the third resistor is connected to the second power supply and the first end of the second resistor respectively, and the second end of the third resistor is grounded; The first end of the fourth resistor is respectively connected to the gate of the second MOS tube and the drain of the third MOS tube, and the second end of the fourth resistor is respectively connected to the input end of the power output module and the source of the second MOS tube.
5. The circuit according to claim 2, characterized in that When the first power supply is supplying power and the second power supply is not supplying power, the power output module is connected to the first power supply through the MOS tube switch module to output the voltage of the first power supply.
6. The circuit according to claim 5, characterized in that The first MOS tube in the MOS tube switch module is turned on, and the second MOS tube and the third MOS tube are turned off.
7. The circuit according to claim 2, characterized in that When the second power supply is supplying power and the first power supply is not supplying power, the power output module is connected to the second power supply through the MOS tube switch module to output the voltage of the second power supply.
8. The circuit according to claim 2, characterized in that When the first power supply is powered and the second power supply is powered, the power output module is connected to the second power supply through the MOS tube switch module to output the voltage of the second power supply.
9. The circuit according to claim 8, characterized in that The second MOS tube and the third MOS tube in the MOS tube switch module are turned on, and the first MOS tube is turned off.
10. The circuit according to claim 7 or 8, characterized in that The static power consumption of the dual power switching circuit is at the microampere current level.