Low power consumption single lithium battery boost circuit

Abstract

The utility model discloses a kind of low-power single lithium battery boost circuit, including single lithium ion battery V1, resistance R1, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, diode D1, diode D2, diode D3, diode D4, 555 chip U1, the utility model has adopted low-power 555 chip and constitutes minimalistic oscillation circuit, realize the square wave output of 50% duty cycle of micro-power consumption, output square wave is boosted to 9-10V by multistage charge pump, there is no inductive element in circuit, and work in low-frequency state, will not produce electromagnetic interference, it is adopted 555 chip of micro-power consumption, oscillation circuit and charge pump boost circuit are also micro-power consumption, overall power consumption is very small, less than 0.1mA, ensure that battery power consumption is also very small when long time storage, the cost of entire boost circuit is very low, only a few cents, with high cost performance.

Description

Technical Field

[0001] This utility model relates to a low-power single-cell lithium battery boost circuit. Background Technology

[0002] Portable devices commonly use 9V batteries, also known as laminated batteries or tandem batteries, or simply 9V block batteries. Based on cell type and specifications, they can be categorized as 6F22 (carbon-zinc battery), 6LR61 (alkaline battery), etc. All 9V batteries have a square shape, with a special snap-fit ​​connector for positive and negative terminals. The output voltage is generally 9V, and they are mainly used in multimeters, microphones, guitars, remote controls, and other devices. Most common 9V batteries are disposable. For users with high requirements or high usage frequency, rechargeable 9V batteries are an option. Rechargeable 9V batteries generally use either lithium-ion or nickel-metal hydride cells.

[0003] Among the 9V batteries currently used in portable devices, carbon-zinc batteries and alkaline batteries are disposable. For users who use them frequently, it is necessary to buy and replace batteries frequently, which is not only expensive but also inconvenient.

[0004] Rechargeable 9V NiMH batteries have a low energy density, resulting in short battery life and frequent charging, causing inconvenience. To improve energy density, some manufacturers in the industry have adopted lithium-ion batteries. Current industry solutions using lithium-ion batteries for 9V boost output employ a BOOST switching power supply topology. When the power transistor short-circuits, it directly short-circuits the battery cell, posing a safety hazard. Furthermore, in lithium-ion batteries using a BOOST boost scheme, the inductor and switching transistor operate at high frequencies, leading to leakage inductance and significant electromagnetic interference, sometimes interfering with portable devices. The BOOST boost method uses PWM modulation, resulting in high static current consumption and significant self-discharge, especially during long-term storage. The BOOST architecture is also expensive. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a low-power single-cell lithium battery boost circuit.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A low-power single-cell lithium battery boost circuit includes a single-cell lithium-ion battery V1, a resistor R1, capacitors C1, C2, C3, C4, and C5, diodes D1, D2, D3, and D4, and a 555 timer chip U1. The GND terminal of the 555 timer chip U1 is connected to ground (GND). The RST terminal of the 555 timer chip U1 is connected to the positive terminal of the single-cell lithium-ion battery V1, and the negative terminal of the single-cell lithium-ion battery V1 is connected to ground (GND). The THR terminal of the 555 timer chip U1 is connected to the TRI terminal of the 555 timer chip U1. The TRI terminal of the 555 timer chip U1 is connected to ground (GND) through capacitor C1. The DIS terminal of the 555 timer chip U1 is connected to the TRI terminal of the 555 timer chip U1 through resistor R1. The DIS terminal of U1 is connected to the OUT terminal of the 555 timer chip U1. The VCC terminal of the 555 timer chip U1 is connected to the positive terminal of the single lithium-ion battery V1. The OUT terminal of the 555 timer chip U1 is connected to the negative terminal of diode D4 through capacitor C3. The positive terminal of diode D4 is connected to the VCC terminal of the 555 timer chip U1. The negative terminal of diode D4 is connected to the positive terminal of diode D2 through diode D3. The negative terminal of diode D2 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is connected to the positive terminal of diode D2 through capacitor C5. The negative terminal of diode D4 is connected to the negative terminal of diode D2 through capacitor C4. The positive terminal of diode D4 is connected to the positive terminal of diode D2 through capacitor C2. The negative terminal of diode D1 outputs the boosted power supply OUT.

[0008] Preferably, the voltage of a single lithium-ion battery V1 is 3.7V.

[0009] As a preferred option, the 555 chip U1 uses a low-power 555 chip.

[0010] Preferably, the resistor R1 is 1MΩ.

[0011] Preferably, capacitor C1 is 0.01nF, and capacitors C2, C3, C4, and C5 are all 22μF.

[0012] Preferably, diodes D1, D2, D3, and D4 are all 1N4148 diodes.

[0013] Preferably, the boosted power supply OUT is 9-10V.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. This utility model uses a low-power 555 chip to form a very simple oscillation circuit, which realizes a square wave output with a low power consumption and a 50% duty cycle. The output square wave is boosted to 9-10V by a multi-stage charge pump.

[0016] 2. The circuit design has no MOSFETs connected to ground, which reduces the risk of MOSFET failure short-circuiting the lithium-ion battery. There are no inductive components in the circuit, and it operates at a low frequency, so it will not generate electromagnetic interference.

[0017] 3. It adopts a low-power 555 chip, and the oscillation circuit and charge pump boost circuit are also low-power. The overall power consumption is very small, less than 0.1mA, which ensures that the battery power consumption is also very small when stored for a long time.

[0018] 4. The cost of the entire boost circuit is very low, only a few cents, making it highly cost-effective. Attached Figure Description

[0019] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0021] like Figure 1 As shown, a low-power single-cell lithium battery boost circuit includes a single-cell lithium-ion battery V1, a resistor R1, capacitors C1, C2, C3, C4, and C5, diodes D1, D2, D3, and D4, and a 555 timer chip U1. The GND terminal of the 555 timer chip U1 is connected to ground (GND). The RST terminal of the 555 timer chip U1 is connected to the positive terminal of the single-cell lithium-ion battery V1, and the negative terminal of the single-cell lithium-ion battery V1 is connected to ground (GND). The THR terminal of the 555 timer chip U1 is connected to the TRI terminal of the 555 timer chip U1. The TRI terminal of the 555 timer chip U1 is connected to ground (GND) through capacitor C1. The DIS terminal of the 555 timer chip U1 is connected to the TRI terminal of the 555 timer chip U1 through resistor R1. The DIS terminal of chip U1 is connected to the OUT terminal of 555 timer chip U1. The VCC terminal of 555 timer chip U1 is connected to the positive terminal of single-cell lithium-ion battery V1. The OUT terminal of 555 timer chip U1 is connected to the negative terminal of diode D4 through capacitor C3. The positive terminal of diode D4 is connected to the VCC terminal of 555 timer chip U1. The negative terminal of diode D4 is connected to the positive terminal of diode D2 through diode D3. The negative terminal of diode D2 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is connected to the positive terminal of diode D2 through capacitor C5. The negative terminal of diode D4 is connected to the negative terminal of diode D2 through capacitor C4. The positive terminal of diode D4 is connected to the positive terminal of diode D2 through capacitor C2. The negative terminal of diode D1 outputs the boosted power supply OUT. 555 timer chip U1 can be replaced by other low-power oscillation chips.

[0022] like Figure 1As shown, the voltage of a single lithium-ion battery V1 is 3.7V, the 555 chip U1 is a low-power 555 chip, the resistor R1 is 1MΩ, the capacitor C1 is 0.01nF, the capacitors C2, C3, C4 and C5 are all 22μF, and the diodes D1, D2, D3 and D4 are all 1N4148 diodes.

[0023] like Figure 1 As shown, the boosted power supply OUT is 9.179V.

[0024] like Figure 1 As shown, by adjusting the resistance of resistor R1 and the capacitance values ​​of capacitors C1, C2, C3, C4, and C5, the boosted power supply output OUT can be set to between 9 and 10V.

[0025] Working principle:

[0026] like Figure 1 As shown, this utility model uses the 555 chip U1 as the core, and forms a low-frequency square wave output with a duty cycle of 50% through the external resistor R1 and capacitor C1; four diodes D1-D4 and four capacitors C2-C5 form a 3-times voltage booster to boost the square wave to 9-10V.

[0027] The circuit operates as follows: It uses a single lithium-ion battery V1 as input, with a nominal voltage of approximately 3.7V, directly supplying power to a low-power general-purpose 555 timer chip U1. The 555 chip U1, along with external resistor R1 and capacitor C1, forms a low-frequency square wave output with a 50% duty cycle. When the 555 chip outputs a low level, its VCC terminal charges capacitor C3 through diode D4. When the 555 chip outputs a high level, capacitor C3 charges capacitor C2 through diode D3, bringing the voltage across C2 close to the VCC terminal of the 555 chip, thus forming a voltage multiplier circuit. Following the same principle, C4, C5, D1, and D2 also form a single-stage voltage multiplier circuit, resulting in a triple voltage multiplier circuit. Because a small voltage drop occurs across the four diodes during operation, the actual output voltage is 9.1V with a 3.7V input, thus boosting the single lithium-ion battery voltage to 9V.

[0028] The key feature of this invention is that it uses a low-power general-purpose 555 chip as the main chip. The 555 chip is externally composed of only a high-resistance resistor and a low-value capacitor to form a low-frequency square wave output with a duty cycle of 50%. The oscillation mode has a low frequency and low power consumption, and does not generate electromagnetic radiation. Four diodes and four capacitors are used to form a 3-voltage charge pump to boost the square wave output by the 555 to 9-10V.

[0029] This invention employs a low-power 555 timer chip to construct a minimally oriented oscillation circuit, achieving a square wave output with a low power consumption and a 50% duty cycle. The output square wave is boosted to 9-10V by a multi-stage charge pump. The circuit design eliminates the need for MOSFETs connected to ground, reducing the risk of short-circuiting the lithium-ion battery due to MOSFET failure. The circuit contains no inductive components and operates at a low frequency, preventing electromagnetic interference. The use of a low-power 555 timer chip, along with the low-power oscillation circuit and charge pump boosting circuit, results in extremely low overall power consumption (less than 0.1mA), ensuring minimal battery power consumption even during extended storage. The entire boosting circuit is very inexpensive, costing only a few cents, offering high cost-effectiveness.

[0030] It should be noted that the above examples are only one specific embodiment of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. In short, all variations that can be directly derived or conceived by those skilled in the art from the content disclosed in this utility model should be considered within the protection scope of this utility model.

Claims

1. A low power consumption single lithium cell boost circuit, characterized by, This circuit includes a single lithium-ion battery V1, a resistor R1, capacitors C1, C2, C3, C4, and C5, diodes D1, D2, D3, and D4, and a 555 timer chip U1. The GND terminal of the 555 timer chip U1 is connected to ground (GND). The RST terminal of the 555 timer chip U1 is connected to the positive terminal of the single lithium-ion battery V1, and the negative terminal of the single lithium-ion battery V1 is connected to ground (GND). The THR terminal of the 555 timer chip U1 is connected to the TRI terminal of the 555 timer chip U1. The TRI terminal of the 555 timer chip U1 is connected to ground (GND) through capacitor C1. The DIS terminal of the 555 timer chip U1 is connected to the TRI terminal of the 555 timer chip U1 through resistor R1. The DIS terminal of the 555 timer chip U1 is connected to... Connect the OUT terminal of the 555 timer chip U1. The VCC terminal of the 555 timer chip U1 is connected to the positive terminal of a single lithium-ion battery V1. The OUT terminal of the 555 timer chip U1 is connected to the negative terminal of diode D4 through capacitor C3. The positive terminal of diode D4 is connected to the VCC terminal of the 555 timer chip U1. The negative terminal of diode D4 is connected to the positive terminal of diode D2 through diode D3. The negative terminal of diode D2 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is connected to the positive terminal of diode D2 through capacitor C5. The negative terminal of diode D4 is connected to the negative terminal of diode D2 through capacitor C4. The positive terminal of diode D4 is connected to the positive terminal of diode D2 through capacitor C2. The negative terminal of diode D1 outputs the boosted power supply OUT.

2. The low power consumption single lithium cell boost circuit according to claim 1, wherein, The voltage of the single lithium-ion battery V1 is 3.7V.

3. The low power consumption single lithium cell boost circuit of claim 1, wherein, The 555 chip U1 uses a low-power 555 chip.

4. The low dropout single lithium cell boost circuit of claim 1, wherein, The resistor R1 is 1MΩ.

5. The low dropout single lithium cell boost circuit of claim 1, wherein, The capacitor C1 is 0.01nF, and the capacitors C2, C3, C4, and C5 are all 22μF.

6. The low dropout single lithium cell boost circuit of claim 1, wherein, Diodes D1, D2, D3, and D4 are all 1N4148 diodes.

7. The low dropout single lithium cell boost circuit of claim 1, wherein, The boosted power supply OUT is 9-10V.

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