Buck-boost LDO topology method based on photon electric energy DC-DC converter

Abstract

The invention discloses a boost LDO topology method based on a photon electric energy DC-DC converter, and the topology utilizes the light-emitting characteristics of an LED and the photovoltaic effect of a photovoltaic cell (PV), and achieves the efficient conversion of electric energy through optical energy transmission. In the system, an LED serves as a light source and converts electric energy into light energy, a photovoltaic cell serves as a receiving end and converts the received light energy into electric energy, and therefore transmission and conversion of the electric energy are achieved. Compared with a traditional LDO, the problem that the traditional LDO cannot achieve boosting is solved, and a more efficient and more stable power management solution is provided through the photon electric energy conversion technology. The technology has important research significance and application value in the fields of power management, chip power supply and the like.

Description

Technical Field

[0001] The invention relates to the field of electric energy conversion, and in particular to a buck-boost LDO topology method based on a photon electric energy DC-DC converter. Background Art

[0002] With the rapid development of electronic devices, the demand for efficient, stable and miniaturized power management technology is increasing. Although traditional DC-DC converters have excellent performance in power conversion efficiency, they have problems such as large size, large output ripple and electromagnetic interference (EMI), which makes it difficult to meet the requirements of modern electronic devices for high-quality output.

[0003] LDO is a low-voltage step-down regulator that can maintain a stable output when the input voltage is close to the output voltage, and has the advantages of high efficiency and low noise. These technologies have solved the problem of single input and output forms of photon-to-electric converters to a certain extent, but there is still a lack of an LDO topology that can achieve step-up and step-down.

[0004] As an emerging power conversion technology, photon-to-electric converters convert and transmit energy through light-emitting diodes (LEDs) and photovoltaic cells (PVs), and have the advantages of high-quality power output, low electromagnetic interference, and low output ripple. As an efficient electro-optical conversion device, LEDs can directly convert electrical energy into light energy, while photovoltaic cells use the photovoltaic effect to convert light energy into electrical energy. This electrical-optical-electrical coupling method can theoretically achieve electrical isolation and zero EMI, meeting the needs of high-precision power supplies. Summary of the invention

[0005] The present invention discloses a buck-boost LDO topology method based on a photon electric energy DC-DC converter. The topology utilizes the light-emitting characteristics of LEDs and the photovoltaic effect of photovoltaic cells (PV) to achieve electric energy conversion through light energy transfer. LEDs are used as light sources, PVs are used as receiving ends, and the output voltage is fed back to the error amplifier EA through voltage-dividing resistors (R1, R2). The error amplifier EA adjusts the power tube M according to the feedback signal. P Control the input current of the LED to form a closed-loop voltage stabilization system; aiming to break through the limitation of traditional LDO that cannot boost voltage by converting light energy, combine light energy conversion technology with power management system, design a more efficient and stable power supply solution, and expand its application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. The technical solutions in the embodiments of the present invention will be clearly and completely described in combination with the drawings of the present invention. Obviously, the described embodiments are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0007] Figure 1 Schematic diagram of a buck-boost LDO topology structure based on a photon power DC-DC converter in an embodiment of the present invention;

[0008] Figure 2 It is a schematic diagram of the working principle of the buck-boost LDO main circuit based on the photon electric energy DC-DC converter in an embodiment of the present invention;

[0009] Figure 3 It is a schematic diagram of the working principle of a buck-boost LDO feedback circuit based on a photon electric energy DC-DC converter in an embodiment of the present invention;

[0010] Figure 4 The flowchart is a method for implementing a buck-boost LDO based on a photon power DC-DC converter in an embodiment of the present invention. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and features in the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] Please refer to Figure 1 , Figure 1 The schematic diagram of the buck-boost LDO topology structure of the photon electric energy DC-DC converter of the present invention includes: a main circuit part, a feedback circuit part and a sampling part;

[0013] The main circuit part includes: a DC source V CC , input side LED, output side photovoltaic PV module 1, second grounding point GND2, the specific connection method is:

[0014] The positive electrode of the input side LED is connected to the DC source V CC Connected;

[0015] The cathode of the input side LED and the power tube M p is connected to a first end of

[0016] The positive electrode of the output-side photovoltaic PV component 1 is connected to the first end of the first resistor R1 and the output end V out Connected;

[0017] The negative electrode of the output-side photovoltaic PV component 1 is connected to the second grounding point GND2;

[0018] The input-side LED and the output-side photovoltaic PV assembly 1 are placed in a space enclosed by reflectors on all sides;

[0019] The feedback circuit part includes: a reference voltage V REF , the third resistor R3, the error amplifier EA, the power tube M p , the first ground point GND1, the specific connection method is:

[0020] The first terminal of the error amplifier EA is connected to the reference voltage V REF Connected;

[0021] The second end of the error amplifier EA is connected to the second end of the first resistor R1 and the first end of the second resistor R2;

[0022] The third terminal of the error amplifier EA is connected to the power tube M p is connected to the second end of

[0023] The power tube M p The third end of is connected to the first end of the third resistor R3;

[0024] The second end of the third resistor R3 is connected to the first ground point GND1;

[0025] The sampling part includes: a first resistor R1, a second resistor R2, and a second grounding point GND2, and the specific connection method is:

[0026] The first end of the first resistor R1 is connected to the positive electrode of the output-side photovoltaic PV component 1;

[0027] The second end of the first resistor R1 is connected to the first end of the first resistor R2 and the second end of the error amplifier EA;

[0028] The second end of the second resistor R2 is connected to the second ground point GND2.

[0029] Please refer to Figure 2 , Figure 2 The schematic diagram of the working principle of the buck-boost LDO main circuit based on the photon power DC-DC converter of the present invention is shown in FIG. Figure 4 The specific step-up and step-down method is as follows:

[0030] Based on the circuit structure of the electric-optical-electrical transmission of the photon-electrical energy DC-DC converter, the input-side LED converts the electric energy into light energy, and the generated photons are received by the N photovoltaic PVs inside the output-side photovoltaic PV assembly 1 through the photon transmission channel, wherein the high voltage gain of the photon-electrical energy converter can be expressed as:

[0031]

[0032] Among them, α and β are the input side LED performance parameters, and their specific values ​​should be determined according to the actual LED device. v is the luminous flux, k ph is the proportionality coefficient between illuminance and photocurrent, S is the illuminated surface area, I o is the reverse saturation current, N is the number of PV in the output side photovoltaic PV module 1, k is the Boltzmann constant, A is the ideal factor, T emp is the temperature of PV, and q is the charge.

[0033] Please refer to Figure 3 , Figure 3 The schematic diagram of the working principle of the buck-boost LDO feedback circuit based on the photon power DC-DC converter of the present invention is shown in FIG. Figure 4 The specific voltage stabilization method is as follows:

[0034] When the output voltage V out When the voltage changes, the voltage at the negative input terminal of the error amplifier EA will also change through the voltage division of the first resistor R1 and the second resistor R2; the error amplifier EA will amplify the voltage difference and drive the power tube M p , the power tube M p Control the input current of the input side LED; if the output voltage V out Lower than the reference voltage V REF The error amplifier EA will increase the drive signal, so that the power tube M p The on-state voltage increases, increasing the input current of the input side LED, thereby increasing the output voltage V out ; On the contrary, if the output voltage V out Higher than the reference voltage V REF , the error amplifier EA will reduce the drive signal, making the power tube M p The on-state voltage is reduced, reducing the input current of the input side LED, thereby reducing the output voltage V out , which can be specifically expressed as:

[0035]

[0036] When the input-side LED is turned on, its on-voltage remains unchanged;

[0037] When the error voltage hour, Reduce, Increase, I LED Increase, V out Increase;

[0038] When the error voltage hour, Increase, Reduce, I LED Decrease, V out Reduce.

Claims

1. A buck-boost LDO topology method based on photon power DC-DC converter, characterized in that: include: DC source V CC , reference voltage V REF , output voltage V out , input side LED, output side photovoltaic PV component 1, first resistor R1, second resistor R2, third resistor R3, error amplifier EA, power tube M p , a first grounding point GND1, a second grounding point GND2; The positive electrode of the input side LED is connected to the DC source V CC Connected; The cathode of the input side LED and the power tube M p is connected to a first end of The first terminal of the error amplifier EA is connected to the reference voltage V REF Connected; The second end of the error amplifier EA is connected to the second end of the first resistor R1 and the first end of the second resistor R2; The third terminal of the error amplifier EA is connected to the power tube M p is connected to the second end of The power tube M p The third end of is connected to the first end of the third resistor R3; The second end of the third resistor R3 is connected to the first ground point GND1; The output-side photovoltaic PV assembly 1 comprises a photovoltaic element: a photovoltaic element PV 11 、Photovoltaic elements PV 12 , ..., and photovoltaic elements PV 1N ; The positive electrode of the output-side photovoltaic PV component 1 is connected to the first end of the first resistor R1, and the output voltage V out Connected; The negative electrode of the output-side photovoltaic PV component 1 is connected to the second grounding point GND2; The second end of the first resistor R1 is connected to the first end of the second resistor R2; The second end of the second resistor R2 is connected to the second ground point GND2; The input-side LED and the output-side photovoltaic PV assembly 1 are placed in a space enclosed by reflectors.

2. The boostable LDO topology method based on photon power DC-DC converter according to claim 1 is characterized in that: The light-emitting characteristics of the input-side LED and the photovoltaic effect of the output-side photovoltaic PV module 1 are used to realize the conversion of electric energy through light energy transfer. The input-side LED is used as the light source, and the output-side photovoltaic PV module 1 is used as the receiving end, as follows: Among them, α and β are the input side LED performance parameters, and their specific values ​​should be determined according to the actual LED device. v is the luminous flux, k ph is the proportionality coefficient between illuminance and photocurrent, S is the illuminated surface area, I o is the reverse saturation current, N is the number of PV in the output side photovoltaic PV module 1, k is the Boltzmann constant, A is the ideal factor, T emp is the temperature of PV, and q is the charge.

3. The boostable LDO topology method based on photon power DC-DC converter according to claim 2 is characterized in that: The output voltage V out The voltage divided by the first resistor R1 and the second resistor R2 is fed back to the error amplifier EA. The error amplifier EA is fed back to the error amplifier EA through the power tube M p Control the input current of the input side LED to form a closed-loop voltage regulation, as follows: When the input-side LED is turned on, its on-voltage remains unchanged; When the error voltage hour, Reduce, Increase, I LED Increase, V OUT Increase; When the error voltage hour, Increase, Reduce, I LED Decrease, V OUT Reduce.

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