Simple lithium battery power supply lifting output voltage adjustable discharge circuit

Abstract

The utility model provides a simple lithium battery power supply lifting output voltage adjustable discharge circuit, which comprises a single-pole double-throw switch, a battery boosting management circuit, a resistance adjustment feedback module, a power utilization output end, a battery voltage reduction management circuit and an isolation rectifier diode, and is characterized in that the input end of the single-pole double-throw switch is connected with the positive electrode of a lithium battery, and the output end of the single-pole double-throw switch is connected with the negative electrode of the lithium battery; the output end of the single-pole double-throw switch is connected with the battery boost management circuit and the battery buck management circuit to realize selection of boost and buck channels; the feedback ends of the battery boost management circuit and the battery step-down management circuit are connected with the resistance adjusting feedback module, the output ends of the battery boost management circuit and the battery step-down management circuit are connected with the isolation rectifier diode, and the isolation rectifier diode is connected to the power utilization output end. The power supply voltage adjusting circuit is simple in circuit, few in components, easy to implement and high in reliability, has a wide-range power supply voltage adjusting capability, and effectively reduces the use cost of lithium battery matched discharging equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a discharge circuit with adjustable output voltage suitable for lithium battery power supply. Background Art

[0002] With the development of science and technology, there are more and more miniaturized, mobile and intelligent digital products. This diversified product has brought new challenges to the power supply mode. Such products are often unable to provide power through wired devices such as power adapters, and lithium battery power supply has become an extremely common and practical way. By utilizing the mobility and rechargeable characteristics of lithium battery power storage, various electronic products have achieved mobility and playability. However, the diversification of products has also put forward multiple requirements for the size of the power supply voltage. Lithium batteries can only provide a single-value voltage output, so they cannot meet the power supply requirements of various products at the same time. At this time, it is often necessary to adapt a separate boost module or buck module to adjust the lithium battery voltage to meet the requirements, and products with different voltage requirements also need to adapt different boost or buck modules, which will greatly increase the user's additional use cost. At present, there are also microprocessor-controlled buck-boost integrated modules on the market to solve the above problems, but this method requires additional software programming development and hardware using relatively expensive devices such as single-chip microcomputers, which still increases the additional use cost of digital electronic products in the final result. To this end, a simple lithium battery-powered buck output voltage adjustable discharge circuit is proposed to solve the above problems. Utility Model Content

[0003] In view of this, the present disclosure provides a simple lithium battery powered step-up / step-down output voltage adjustable discharge circuit, which aims to solve the problems that the existing step-up / step-down integrated module in the background technology requires additional software programming development, single-chip microcomputers and other relatively expensive devices. While having the ability to adjust a wide range of lithium battery power supply voltages, the use cost of lithium battery supporting discharge equipment can be further reduced.

[0004] The disclosed embodiment provides a simple lithium battery-powered step-up / step-down output voltage adjustable discharge circuit, which specifically includes a single-pole double-throw switch, a battery boost management circuit, a resistance adjustment feedback module, a power output terminal, a battery buck management circuit and an isolation rectifier diode. The input terminal of the single-pole double-throw switch is connected to the positive electrode of the lithium battery, and the output terminal of the single-pole double-throw switch is respectively connected to the battery boost management circuit and the battery buck management circuit to realize the selection of boost and buck channels; the feedback terminals of the battery boost management circuit and the battery buck management circuit are connected to the resistance adjustment feedback module, and the output terminals of the battery boost management circuit and the battery buck management circuit are connected to the isolation rectifier diode, and the isolation rectifier diode is connected to the power output terminal.

[0005] Further describing the above scheme, the battery boost management circuit includes a first capacitor C4, a boost DC-DC power supply chip U3, and an energy storage inductor L2. The first capacitor C4 is connected between the power input pin IN of the boost DC-DC power supply chip U3 and the circuit ground terminal, and is used to store and filter the input voltage and current; the enable pin EN of the boost DC-DC power supply chip U3 is connected to the input pin IN, and is used to connect a high level to turn on the boost converter function of the chip; the energy storage inductor L2 is connected between the input pin IN and the output pin SW of the boost DC-DC power supply chip U3, and the output pin SW is also connected to the anode of the diode D4. The energy storage inductor L2 and the first capacitor C4 are connected to the positive electrode of the lithium battery after the single-pole double-throw switch is turned on.

[0006] Further describing the above scheme, the battery buck management circuit includes a second capacitor C6, a buck DC-DC power supply chip U2, and an energy storage inductor L1; the second capacitor C6 is connected between the power input pin VIN of the buck DC-DC power supply chip U2 and the circuit ground terminal, and is used to store and filter the input voltage and current; the enable pin EN of the buck DC-DC power supply chip U2 is connected to the input pin VIN, and is used to connect a high level to turn on the buck converter function of the chip; the energy storage inductor L1 is connected between the output pin SW of the buck DC-DC power supply chip U2 and the anode of the diode D3, and the second capacitor C6 and the input pin VIN of the buck DC-DC power supply chip U2 are connected to the positive electrode of the lithium battery after the single-pole double-throw switch is turned on.

[0007] Further describing the above scheme, the resistance adjustment feedback module includes a fixed resistance resistor R6 and a potentiometer R5, the resistor R6 and the potentiometer R5 are connected in series, one end of the potentiometer R5 is connected to the power output end, and one end of the resistor R6 is grounded; the adjustment end of the potentiometer R5 is respectively connected to the feedback pin FB of the boost DC-DC power supply chip U3 and the feedback pin FB of the buck DC-DC power supply chip U2.

[0008] As an improvement, the isolation rectifier diode includes two Schottky diodes D3 and D4 to achieve isolation and rectification of the circuit.

[0009] To further describe the above solution, the power output end includes a third capacitor C5, one end of the capacitor C5 is grounded, and the other end is connected to the output end of the isolation rectifier diode to achieve energy storage and voltage compensation.

[0010] Optionally, the chip models used in the battery boost management circuit and the battery buck management circuit are MT3608 and MT3410LB respectively.

[0011] Compared with the prior art, the circuit of the present application is simple, easy to implement, and highly reliable; it can adjust the output voltage as needed to adapt to different application scenarios; it has the ability to regulate a wide range of power supply voltages, effectively reducing the use cost of lithium battery supporting discharge equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0013] Figure 1 A schematic diagram of the principle provided for an embodiment of the utility model;

[0014] Figure 2 A circuit diagram provided for an embodiment of the utility model.

[0015] Among them, the reference numerals in the figure are:

[0016] 1. Lithium battery; 2. Single-pole double-throw switch; 3. Battery boost management circuit; 4. Resistance adjustment feedback module; 5. Battery buck management circuit; 6. Diode D4; 61. Diode D3; 7. Power output terminal.

[0017] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0019] The directional nouns involved in the embodiments of the present disclosure, such as "upper", "lower", "side", etc., are generally based on the relative directional relationship between the structures when the thermos cup or the cup cover is usually placed, and these directional nouns are used only to more clearly describe the relationship between the structures, not to describe the absolute directional. When the product is placed in different postures, the directional position may change, for example, "upper" and "lower" may be interchangeable.

[0020] In order to make the technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0021] See also Figure 1 , 2 As shown, the embodiment of the present disclosure provides a simple lithium battery powered step-up / step-down output voltage adjustable discharge circuit, which specifically includes a single-pole double-throw switch 2, a battery step-up management circuit 3, a resistance adjustment feedback module 4, a power output terminal 7, a battery step-down management circuit 5 and an isolation rectifier diode. Figure 1 As shown, the input end of the single-pole double-throw switch 2 is connected to the positive electrode of the lithium battery 1, and the output end of the single-pole double-throw switch 2 is respectively connected to the battery boost management circuit 3 and the battery buck management circuit 5 to realize the selection of the boost and buck channels. The feedback ends of the battery boost management circuit 3 and the battery buck management circuit 5 are connected to the resistance adjustment feedback module 4, and the resistance adjustment feedback module 4 is shared by the battery boost management circuit 3 and the battery buck management circuit 5. The output ends of the battery boost management circuit 3 and the battery buck management circuit 5 are connected to the isolation rectifier diode, and the isolation rectifier diode is connected to the power output terminal 7. The isolation rectifier diode D361 is used to isolate the influence of the output voltage on the battery boost management part chip after selecting the battery buck channel. Similarly, the isolation rectifier diode D46 is used to isolate the influence of the output voltage on the battery buck management part chip after selecting the battery boost part channel.

[0022] like Figure 2 As shown, the battery boost management circuit 3 includes a first capacitor C4, a boost DC-DC power supply chip U3, and an energy storage inductor L2. The first capacitor C4 is connected between the power input pin IN of the boost DC-DC power supply chip U3 and the circuit ground terminal, and is used to store and filter the input voltage and current; the enable pin EN of the boost DC-DC power supply chip U3 is connected to the input pin IN, and is used to connect a high level to turn on the boost converter function of the chip; the energy storage inductor L2 is connected between the input pin IN and the output pin SW of the boost DC-DC power supply chip U3, and the output pin SW is also connected to the anode of the diode D46. The energy storage inductor L2 and the first capacitor C4 are connected to the positive electrode of the lithium battery 1 after the single-pole double-throw switch 2 is turned on.

[0023] like Figure 2As shown, the battery buck management circuit 5 includes a second capacitor C6, a buck DC-DC power supply chip U2, and an energy storage inductor L1; the second capacitor C6 is connected between the power input pin VIN of the buck DC-DC power supply chip U2 and the circuit ground terminal, and is used to store and filter the input voltage and current; the enable pin EN of the buck DC-DC power supply chip U2 is connected to the input pin VIN, and is used to connect a high level to turn on the buck converter function of the chip; the energy storage inductor L1 is connected between the output pin SW of the buck DC-DC power supply chip U2 and the anode of the diode D361, and the second capacitor C6 and the input pin VIN of the buck DC-DC power supply chip U2 are connected to the positive electrode of the lithium battery 1 after the single-pole double-throw switch 2 is turned on.

[0024] like Figure 2 As shown, the resistance adjustment feedback module 4 includes a fixed resistance resistor R6 and a potentiometer R5, the resistor R6 and the potentiometer R5 are connected in series, one end of the potentiometer R5 is connected to the power output terminal 7, and one end of the resistor R6 is grounded; the adjustment end of the potentiometer R5 is respectively connected to the feedback pin FB of the boost type DC-DC power supply chip U3 and the feedback pin FB of the buck type DC-DC power supply chip U2. When the pin 1 and the pin 2 of the single-pole double-throw switch SW2 are connected, the resistance value of the adjusting potentiometer can adjust the voltage of the output part to change between the voltage of the lithium battery 1 itself and the adjustable maximum voltage. The adjustable maximum voltage is calculated by the formula: 0.6*{1+R52 / R51+R6}, where R51 is Figure 2 The resistance value of the potentiometer R5 is the left part of the adjustment rod, and R52 is the resistance value of the right part of the adjustment rod. When the pin 2 and pin 3 of the single-pole double-throw switch SW2 are connected, the resistance value of the potentiometer R5 can be adjusted to adjust the output voltage between the adjustable minimum voltage and the voltage of the lithium battery 1 itself. The adjustable minimum voltage is calculated by this formula: 0.6*{1+R52 / R51+R6}, where R51 is Figure 2 The potentiometer R5 is adjusted to the resistance value of the left part of the rod, and R52 is the resistance value of the right part of the rod.

[0025] In an exemplary embodiment, the isolation rectifier diode uses two Schottky diodes D3 and D4 to achieve isolation and rectification of the circuit. Figure 2As shown, the power output terminal 7 includes a third capacitor C5, one end of the capacitor C5 is grounded, and the other end is connected to the output end of the isolation rectifier diode to achieve energy storage and voltage compensation. The Schottky diode has a very small forward conduction voltage drop and a faster reverse recovery capability, which can provide a better rectification effect. The Schottky diode D46 can also isolate the influence of the output part voltage after the battery boost on the battery step-down IC. Similarly, the Schottky diode D361 can also isolate the influence of the output part voltage after the battery step-down on the battery step-up IC. When the load connected to the output part is too heavy, the capacitor C5 can appropriately compensate for the voltage drop.

[0026] In this exemplary embodiment, the chip models used in the battery boost management circuit 3 and the battery buck management circuit 5 are MT3608 and MT3410LB respectively. In order to understand the disclosure of the utility model more thoroughly and comprehensively, the principle is further explained in combination with the usage mode.

[0027] In practical applications, such as Figure 2 As shown, select the model and parameters of the components and then weld them, and connect the power output terminal 7 to the power device. This exemplary embodiment uses a lithium battery 1 with a voltage of 3.7V for power supply. If the power device is powered by a voltage of 9V, Figure 2 As shown, it is necessary to turn the single-pole double-throw switch SW2 upward to connect pin 1 with pin 2, and the lithium battery 1 supplies power to the battery boost management circuit 3, and then turn the potentiometer R5 adjustment lever to make the output voltage around 9V. After the circuit is powered on, the Schottky diode D46 isolates and rectifies the circuit, isolating the impact of the output voltage from the battery boost on the battery decompression IC. Similarly, if the voltage required by the electrical equipment is less than 3.7V, turn the single-pole double-throw switch SW2 downward to connect pin 2 with pin 3, and the lithium battery 1 supplies power to the battery step-down management circuit 5, and then turn the potentiometer R5 adjustment lever to obtain the required voltage.

[0028] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0029] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A simple lithium battery powered step-up / step-down output voltage adjustable discharge circuit, characterized in that: The invention comprises a single-pole double-throw switch (2), a battery boost management circuit (3), a resistance adjustment feedback module (4), an electric power output terminal (7), a battery buck management circuit (5) and an isolation rectifier diode, wherein the input terminal of the single-pole double-throw switch (2) is connected to the positive electrode of the lithium battery (1), and the output terminal of the single-pole double-throw switch (2) is respectively connected to the battery boost management circuit (3) and the battery buck management circuit (5) to realize the selection of boost and buck channels; the feedback terminals of the battery boost management circuit (3) and the battery buck management circuit (5) are connected to the resistance adjustment feedback module (4), and the output terminals of the battery boost management circuit (3) and the battery buck management circuit (5) are connected to the isolation rectifier diode, and the isolation rectifier diode is connected to the electric power output terminal (7).

2. According to claim 1, a simple lithium battery powered step-up / step-down output voltage adjustable discharge circuit is characterized in that: The battery boost management circuit (3) comprises a first capacitor C4, a boost type DC-DC power supply chip U3, and an energy storage inductor L2. The first capacitor C4 is connected between a power input pin IN of the boost type DC-DC power supply chip U3 and a circuit ground terminal, and is used for storing energy and filtering input voltage and current. The enable pin EN of the boost-type DC-DC power supply chip U3 is connected to the input pin IN, and is used to connect a high level to turn on the boost converter function of the chip; the energy storage inductor L2 is connected between the input pin IN and the output pin SW of the boost-type DC-DC power supply chip U3, and the output pin SW is also connected to the anode of the diode D4 (6); the energy storage inductor L2 and the first capacitor C4 are connected to the positive electrode of the lithium battery (1) after the single-pole double-throw switch (2) is turned on.

3. According to the simple lithium battery powered up / down output voltage adjustable discharge circuit of claim 1, it is characterized in that: The battery step-down management circuit (5) comprises a second capacitor C6, a step-down DC-DC power supply chip U2, and an energy storage inductor L1; the second capacitor C6 is connected between the power input pin VIN of the step-down DC-DC power supply chip U2 and the circuit ground terminal, and is used to store energy and filter the input voltage and current; the enable pin EN of the step-down DC-DC power supply chip U2 is connected to the input pin VIN, and is used to connect a high level to turn on the chip's step-down converter function; the energy storage inductor L1 is connected between the output pin SW of the step-down DC-DC power supply chip U2 and the anode of the diode D3 (61); the second capacitor C6 and the input pin VIN of the step-down DC-DC power supply chip U2 are connected to the positive electrode of the lithium battery (1) after the single-pole double-throw switch (2) is turned on.

4. According to claim 1, a simple lithium battery powered up / down output voltage adjustable discharge circuit is characterized in that: The resistance adjustment feedback module (4) comprises a fixed resistance resistor R6 and a potentiometer R5, wherein the resistor R6 and the potentiometer R5 are connected in series, one end of the potentiometer R5 is connected to the power output terminal (7), and one end of the resistor R6 is grounded; the adjustment end of the potentiometer R5 is respectively connected to the feedback pin FB of the step-up DC-DC power supply chip U3 and the feedback pin FB of the step-down DC-DC power supply chip U2.

5. A simple lithium battery powered up / down output voltage adjustable discharge circuit according to claim 1, characterized in that: The isolation rectifier diode includes two Schottky diodes D3 and D4 to achieve isolation and rectification of the circuit.

6. A simple lithium battery powered up / down output voltage adjustable discharge circuit according to claim 1, characterized in that: The power output terminal (7) comprises a third capacitor C5, one end of which is grounded, and the other end of which is connected to the output end of the isolation rectifier diode to achieve energy storage and voltage compensation.

7. A simple lithium battery powered up / down output voltage adjustable discharge circuit according to claim 1, characterized in that: The chip models used in the battery voltage boost management circuit (3) and the battery voltage drop management circuit (5) are MT3608 and MT3410LB respectively.

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