A power supply adaptation circuit with low standby power consumption

Abstract

The utility model discloses a kind of power supply adaptation circuit of low standby power consumption, it is related to power supply adapter technical field.Its main technical scheme: including rectifier module, primary side control module, transformer module and synchronous rectification module, the input end of rectifier module is used to connect input power supply;The input end of primary side control module is connected with the output end of the rectifier module;The transformer module is connected with the rectifier module, primary side control module;The input end of the synchronous rectification module is connected with the output end of the transformer module, and the output end of the synchronous rectification module is used to output target voltage.AC input power supply is converted into direct-current voltage by rectifier module, primary side control module controls the working state of transformer according to feedback information, transformer transmits energy to secondary, and synchronous rectification module converts the pulsating direct current of secondary into stable direct-current output voltage, finally outputs target voltage.To achieve the purpose of low standby power consumption and high efficiency power conversion.

Description

Technical Field

[0001] This utility model relates to the field of power adapter technology, specifically to a power adapter circuit with low standby power consumption. Background Technology

[0002] Traditional power adapters typically use linear power supplies, which convert AC to DC through a step-down transformer and rectifier circuit, and then stabilize the output voltage using a linear regulator. However, under light load or no-load conditions, the linear regulator still consumes a significant amount of power, resulting in high standby power consumption. Utility Model Content

[0003] The purpose of this invention is to provide a power adapter circuit with low standby power consumption, which solves the problem that in existing power adapters, the linear regulator consumes a lot of power under light load or no-load conditions, resulting in high standby power loss.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A low standby power consumption power adapter circuit includes a rectifier module, a primary-side control module, a transformer module, and a synchronous rectifier module. The input terminal of the rectifier module is used to connect to an input power supply. The input terminal of the primary-side control module is connected to the output terminal of the rectifier module. The transformer module is connected to both the rectifier module and the primary-side control module. The input terminal of the synchronous rectifier module is connected to the output terminal of the transformer module, and the output terminal of the synchronous rectifier module is used to output a target voltage.

[0006] A further technical solution is as follows: the rectifier module includes a fuse F1, a rectifier BD1, an electrolytic capacitor CE1, an inductor L1, an inductor L2, and an electrolytic capacitor CE2; one end of the fuse F1 is connected to the L terminal of the input power supply; pin 2 of the rectifier BD1 is connected to the other end of the fuse F1; pin 1 of the rectifier BD1 is connected to the N terminal of the input power supply; pin 4 of the rectifier BD1 is connected to the negative terminal of the electrolytic capacitor CE1 and one end of the inductor L1; pin 3 of the rectifier BD1 is connected to the positive terminal of the electrolytic capacitor CE1 and one end of the inductor L2; the other end of the inductor L2 is connected to the positive terminal of the electrolytic capacitor CE2, the primary-side control module, and the transformer module; the other end of the inductor L1 and the negative terminal of the electrolytic capacitor CE2 are both grounded.

[0007] A further technical solution is as follows: The transformer module includes a transformer T1, a resistor R9, a capacitor C1, a resistor R2, a diode D1, and a capacitor CY1; the transformer T1 includes a first transformer section T1A and a second transformer section T1B; pin 1 of the first transformer section T1A, one end of resistor R9, one end of capacitor C1, and one end of capacitor CY1 are all connected to the other end of inductor L2; the other end of capacitor CY1 is grounded; the other ends of resistor R9 and capacitor C1 are all connected to one end of resistor R2; the other end of resistor R2 is connected to the negative terminal of diode D2; the positive terminal of diode D2 is connected to pin 3 of the first transformer section T1A and the primary-side control module; pins 5 and 6 of the first transformer section T1A are both connected to the synchronous rectification module; the second transformer section T1B is connected to the primary-side control module.

[0008] A further technical solution is as follows: The primary-side control module includes a primary-side control chip U1, resistors R1, R11, R12, R4, electrolytic capacitor CE3, capacitor C6, diode D3, resistors R5, R6, capacitor C2, resistor R7, and resistor R8; the primary-side control chip U1 is a DP2540A_SOP-7; one end of resistor R1 is connected to the other end of inductor L2; the other end of resistor R1 is connected to one end of resistor R11; the other end of resistor R11 is connected to one end of resistor R12 and one end of resistor R4; the other end of resistor R4 is connected to pin 1 of the primary-side control chip U1; the other end of resistor R12 is connected to the negative terminal of diode D3 and electrolytic capacitor C6. The positive terminal of E3 and one end of capacitor C6 are both connected; the negative terminal of electrolytic capacitor CE3 and the other end of capacitor C6 are both grounded; the positive terminal of diode D3 is connected to one end of resistor R5 and pin 4 of the second transformer section T1B; the other end of resistor R5, one end of resistor R6, and one end of capacitor C2 are all connected to pin 2 of the primary-side control chip U1; the other end of resistor R6, the other end of capacitor C2, pin 2 of the second transformer section T1B, one end of resistor R7, and one end of resistor R8 are all grounded; the other end of resistor R7 and the other end of resistor R8 are both connected to pin 4 of the primary-side control chip U1; pins 5 and 6 of the primary-side control chip U1 are both connected to the positive terminal of diode D2.

[0009] A further technical solution is as follows: the synchronous rectification module includes a synchronous rectification chip U2, a capacitor C5, a resistor R10, a capacitor C3, a diode D1, an electrolytic capacitor CE5, a resistor R13, and an electrolytic capacitor CE4; the synchronous rectification chip U2 is a U7710_SOP-8; pins 1, 2, and 3 of the synchronous rectification chip U2, one end of capacitor C5, and one end of resistor R10 are all connected to pin 6 of the first transformer section T1A; pin 4 of the synchronous rectification chip U2 is connected to the other end of capacitor C5; the other end of resistor R10... One end of the diode D1 is connected to one end of the capacitor C3; the negative terminal of the diode D1 is connected to pin 5, pin 6, pin 7, pin 8 of the synchronous rectifier chip U2, one end of the electrolytic capacitor CE5, the resistor R13, and the positive terminal of the electrolytic capacitor CE4, and the negative terminal of the diode D1 is used as the positive terminal of the output target voltage; pin 5 of the first transformer section T1A, the negative terminal of the electrolytic capacitor CE5, the other end of the resistor R13, and the negative terminal of the electrolytic capacitor CE4 are all grounded, and pin 5 of the first transformer section T1A is used as the negative terminal of the output target voltage.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] The AC input power is converted into DC voltage by the rectifier module. The primary-side control module controls the transformer's operating state based on feedback information. The transformer transfers energy to the secondary side, where the synchronous rectifier module converts the pulsating DC power into a stable DC output voltage, ultimately outputting the target voltage. This aims to achieve low standby power consumption and high-efficiency power conversion. Attached Figure Description

[0012] Figure 1 This is an electrical block diagram of a low standby power supply adapter circuit in this embodiment;

[0013] Figure 2 This is a circuit topology diagram of a low standby power adapter circuit in this embodiment.

[0014] The attached diagram shows the markings and corresponding component names:

[0015] 100 - Rectifier module; 200 - Primary-side control module; 300 - Transformer module; 400 - Synchronous rectification module. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Example 1: This example provides a low standby power consumption power adapter circuit, such as... Figure 1As shown, the system includes a rectifier module 100, a primary-side control module 200, a transformer module 300, and a synchronous rectifier module 400. The input terminal of the rectifier module 100 is used to connect to the input power supply. The input terminal of the primary-side control module 200 is connected to the output terminal of the rectifier module 100. The transformer module 300 is connected to both the rectifier module 100 and the primary-side control module 200. The input terminal of the synchronous rectifier module 400 is connected to the output terminal of the transformer module 300, and the output terminal of the synchronous rectifier module 400 is used to output the target voltage.

[0018] In this embodiment, as Figure 2 As shown, the rectifier module 100 includes a fuse F1, a rectifier BD1, an electrolytic capacitor CE1, an inductor L1, an inductor L2, and an electrolytic capacitor CE2. One end of the fuse F1 is connected to the L terminal of the input power supply. Pin 2 of the rectifier BD1 is connected to the other end of the fuse F1. Pin 1 of the rectifier BD1 is connected to the N terminal of the input power supply. Pin 4 of the rectifier BD1 is connected to the negative terminal of the electrolytic capacitor CE1 and one end of the inductor L1. Pin 3 of the rectifier BD1 is connected to the positive terminal of the electrolytic capacitor CE1 and one end of the inductor L2. The other end of the inductor L2 is connected to the positive terminal of the electrolytic capacitor CE2, the primary-side control module 200, and the transformer module 300. The other end of the inductor L1 and the negative terminal of the electrolytic capacitor CE2 are both grounded.

[0019] In this embodiment, as Figure 2 As shown, the transformer module 300 includes a transformer T1, a resistor R9, a capacitor C1, a resistor R2, a diode D1, and a capacitor CY1. The transformer T1 includes a first transformer section T1A and a second transformer section T1B. Pin 1 of the first transformer section T1A, one end of resistor R9, one end of capacitor C1, and one end of capacitor CY1 are all connected to the other end of inductor L2. The other end of capacitor CY1 is grounded. The other ends of resistor R9 and capacitor C1 are all connected to one end of resistor R2. The other end of resistor R2 is connected to the negative terminal of diode D2. The positive terminal of diode D2 is connected to pin 3 of the first transformer section T1A and the primary-side control module 200. Pins 5 and 6 of the first transformer section T1A are both connected to the synchronous rectification module 400. The second transformer section T1B is connected to the primary-side control module 200.

[0020] In this embodiment, as Figure 2As shown, the primary-side control module 200 includes a primary-side control chip U1, resistors R1, R11, R12, and R4, an electrolytic capacitor CE3, a capacitor C6, a diode D3, resistors R5, R6, and C2, resistors R7 and R8; the primary-side control chip U1 is a DP2540A_SOP-7; one end of resistor R1 is connected to the other end of inductor L2; the other end of resistor R1 is connected to one end of resistor R11; the other end of resistor R11 is connected to one end of resistor R12 and one end of resistor R4; the other end of resistor R4 is connected to pin 1 of the primary-side control chip U1; the other end of resistor R12 is connected to the cathode of diode D3 and electrolytic capacitor CE3. The positive terminal of the diode D2 and one end of the capacitor C6 are both connected; the negative terminal of the electrolytic capacitor CE3 and the other end of the capacitor C6 are both grounded; the positive terminal of the diode D3 is connected to one end of the resistor R5 and pin 4 of the second transformer section T1B; the other end of the resistor R5, one end of the resistor R6, and one end of the capacitor C2 are all connected to pin 2 of the primary-side control chip U1; the other end of the resistor R6, the other end of the capacitor C2, pin 2 of the second transformer section T1B, one end of the resistor R7, and one end of the resistor R8 are all grounded; the other end of the resistor R7 and the other end of the resistor R8 are both connected to pin 4 of the primary-side control chip U1; pins 5 and 6 of the primary-side control chip U1 are both connected to the positive terminal of the diode D2.

[0021] In this embodiment, as Figure 2 As shown, the synchronous rectification module 400 includes a synchronous rectification chip U2, a capacitor C5, a resistor R10, a capacitor C3, a diode D1, an electrolytic capacitor CE5, a resistor R13, and an electrolytic capacitor CE4; the synchronous rectification chip U2 is a U7710_SOP-8; pins 1, 2, and 3 of the synchronous rectification chip U2, one end of capacitor C5, and one end of resistor R10 are all connected to pin 6 of the first transformer section T1A; pin 4 of the synchronous rectification chip U2 is connected to the other end of capacitor C5; the other end of resistor R10 is connected to... One end of capacitor C3 is connected; the negative terminal of diode D1 is connected to pin 5, pin 6, pin 7, pin 8 of synchronous rectifier chip U2, electrolytic capacitor CE5, one end of resistor R13, and the positive terminal of electrolytic capacitor CE4, and the negative terminal of diode D1 is used as the positive terminal of the output target voltage; pin 5 of the first transformer section T1A, the negative terminal of electrolytic capacitor CE5, the other end of resistor R13, and the negative terminal of electrolytic capacitor CE4 are all grounded, and pin 5 of the first transformer section T1A is used as the negative terminal of the output target voltage.

[0022] The working principle of a low standby power adapter circuit in this embodiment is as follows:

[0023] The input power supply is AC voltage of 180V-240V.

[0024] Fuse F1 is connected to the L terminal of the input power supply to protect subsequent circuits and reduce the risk of overcurrent damage to circuit components.

[0025] Pin 2 of rectifier BD1 is connected to fuse F1. Pin 1 of rectifier BD1 is connected to the N terminal of the input power supply. Pin 4 of rectifier BD1 outputs pulsating DC power at the negative terminal and pulsating DC power at the positive terminal.

[0026] Electrolytic capacitors CE1 and CE2 filter the pulsating DC output from rectifier BD1 to smooth the rectified pulsating DC and make it more stable.

[0027] Inductors L1 and L2, together with electrolytic capacitor CE1, form a π-type filter to further smooth the DC voltage.

[0028] Resistors R1, R11, and R4 form a voltage divider network to detect the input voltage of the primary-side control chip U1 and transmit the signal to pin 1 of the primary-side control chip U1 to start and protect it. The aim is to control the operating state of transformer T1 through the primary-side control chip U1, thereby regulating the output voltage of transformer T1.

[0029] Diode D3 is used for freewheeling to prevent reverse voltage from damaging the primary-side control chip U1; CE3 is used for filtering to provide a stable startup voltage to the primary-side control chip U1.

[0030] Resistors R5 and R6 and capacitor C2 form a feedback network that feeds back the voltage information of the transformer's secondary side to pin 2 of the primary-side control chip U1, so that the primary-side control chip U1 can adjust the switching frequency and duty cycle, thereby controlling the transformer's output voltage.

[0031] Resistors R7 and R8 are used to set the internal reference voltage of U1 to adjust the operating state of the primary-side control chip U1.

[0032] The transformer module 300 includes a first transformer section T1A and a second transformer section T1B of the transformer T1. The first transformer section T1A receives control signals from the primary side control chip U1 and pulsating DC from the rectifier BD1, and transmits them to the secondary coil through magnetic coupling to provide energy for the synchronous rectification module 400.

[0033] The second transformer section T1B is used to transmit the voltage information of the transformer secondary to the primary control chip U1 to achieve closed-loop control.

[0034] The synchronous rectifier chip U2 converts the pulsating DC power from the transformer secondary into a stable DC output voltage.

[0035] Capacitor C5 and resistor R10 form a filter network to smooth the pulsating DC current in the transformer secondary winding.

[0036] Electrolytic capacitors CE5 and CE4 are used to filter pulsating DC current to output a stable target voltage. The target voltage is a DC voltage of 5.0VDC, and the rated output current is 2.0A.

[0037] The AC input power is converted into DC voltage by rectifier module 100. Primary-side control module 200 controls the transformer's operating state based on feedback information. The transformer transfers energy to the secondary side, where synchronous rectifier module 400 converts the pulsating DC power into a stable DC output voltage, ultimately outputting the target voltage. This aims to achieve low standby power consumption and high-efficiency power conversion.

[0038] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A power supply adaptation circuit with low standby power consumption, characterized in that include: A rectifier module (100) is provided, wherein the input terminal of the rectifier module (100) is used to connect to an input power supply. Primary-side control module (200), the input terminal of which is connected to the output terminal of the rectifier module (100); A transformer module (300) is connected to both the rectifier module (100) and the primary-side control module (200). A synchronous rectification module (400) is provided, the input terminal of which is connected to the output terminal of the transformer module (300), and the output terminal of the synchronous rectification module (400) is used to output the target voltage.

2. The power adapter circuit according to claim 1, characterized in that: The rectifier module (100) includes a fuse F1, a rectifier BD1, an electrolytic capacitor CE1, an inductor L1, an inductor L2, and an electrolytic capacitor CE2. One end of the fuse F1 is used to connect to the L terminal of the input power supply; Pin 2 of the rectifier BD1 is connected to the other end of the fuse F1; Pin 1 of the rectifier BD1 is used to connect to the N terminal of the input power supply; Pin 4 of the rectifier BD1 is connected to the negative terminal of the electrolytic capacitor CE1 and one end of the inductor L1. Pin 3 of the rectifier BD1 is connected to the positive terminal of the electrolytic capacitor CE1 and one end of the inductor L2. The other end of the inductor L2 is connected to the positive terminal of the electrolytic capacitor CE2, the primary-side control module (200), and the transformer module (300); The other end of the inductor L1 and the negative terminal of the electrolytic capacitor CE2 are both grounded.

3. The power adapter circuit according to claim 2, characterized in that: The transformer module (300) includes a transformer T1, a resistor R9, a capacitor C1, a resistor R2, a diode D1, and a capacitor CY1; The transformer T1 includes a first transformer section T1A and a second transformer section T1B; Pin 1 of the first transformer section T1A, one end of resistor R9, one end of capacitor C1, and one end of capacitor CY1 are all connected to the other end of inductor L2. The other end of capacitor CY1 is grounded; The other end of resistor R9 and the other end of capacitor C1 are both connected to one end of resistor R2. The other end of the resistor R2 is connected to the negative terminal of the diode D2; The positive terminal of diode D2 is connected to pin 3 of the first transformer section T1A and the primary side control module (200); Pin 5 and pin 6 of the first transformer section T1A are both connected to the synchronous rectification module (400); The second transformer section T1B is connected to the primary side control module (200).

4. The power adapter circuit according to claim 3, characterized in that: The primary-side control module (200) includes a primary-side control chip U1, resistors R1, R11, R12, R4, electrolytic capacitor CE3, capacitor C6, diode D3, resistors R5, R6, capacitor C2, resistor R7, and resistor R8. The primary-side control chip U1 is DP2540A_SOP-7; One end of the resistor R1 is connected to the other end of the inductor L2; The other end of resistor R1 is connected to one end of resistor R11; The other end of resistor R11 is connected to one end of resistor R12 and one end of resistor R4; The other end of the resistor R4 is connected to pin 1 of the primary control chip U1; The other end of the resistor R12 is connected to the negative terminal of the diode D3, the positive terminal of the electrolytic capacitor CE3, and one end of the capacitor C6. The negative terminal of the electrolytic capacitor CE3 and the other end of the capacitor C6 are both grounded. The positive terminal of the diode D3 is connected to one end of the resistor R5 and pin 4 of the second transformer section T1B. The other end of resistor R5, one end of resistor R6, and one end of capacitor C2 are all connected to pin 2 of the primary control chip U1. The other end of resistor R6, the other end of capacitor C2, pin 2 of the second transformer section T1B, one end of resistor R7, and one end of resistor R8 are all grounded. The other end of resistor R7 and the other end of resistor R8 are both connected to pin 4 of the primary control chip U1. Pin 5 and pin 6 of the primary-side control chip U1 are both connected to the positive terminal of the diode D2.

5. The power adapter circuit according to claim 4, characterized in that: The synchronous rectification module (400) includes a synchronous rectification chip U2, a capacitor C5, a resistor R10, a capacitor C3, a diode D1, an electrolytic capacitor CE5, a resistor R13, and an electrolytic capacitor CE4. The synchronous rectifier chip U2 is U7710_SOP-8; Pin 1, pin 2, pin 3 of synchronous rectifier chip U2, one end of capacitor C5, and one end of resistor R10 are all connected to pin 6 of the first transformer section T1A. Pin 4 of the synchronous rectifier chip U2 is connected to the other end of the capacitor C5; The other end of the resistor R10 is connected to one end of the capacitor C3; The negative terminal of diode D1 is connected to pin 5, pin 6, pin 7, pin 8 of synchronous rectifier chip U2, electrolytic capacitor CE5, one end of resistor R13, and the positive terminal of electrolytic capacitor CE4. The negative terminal of diode D1 is used as the positive terminal of the output target voltage. Pin 5 of the first transformer section T1A, the negative terminal of electrolytic capacitor CE5, the other end of resistor R13, and the negative terminal of electrolytic capacitor CE4 are all grounded, and pin 5 of the first transformer section T1A is used as the negative terminal of the output target voltage.

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