Zero standby input switching power supply circuit

Abstract

The utility model discloses a zero standby input switching power supply circuit, and relates to the technical field of switching power supplies. According to the main technical scheme, the circuit comprises an MOS tube Q101, a triode Q102 and a rectification filtering module, wherein the source electrode of the MOS tube Q101 is used for being connected with a power supply; the collector electrode of the triode Q102 is connected with the source electrode of the MOS tube Q101 and the grid electrode of the MOS tube Q101; the base electrode of the triode Q102 is used for accessing a switching signal; the emitter of the triode Q102 is grounded; the input end of the rectification filtering module is connected with the drain electrode of the MOS tube Q101, and the output end of the rectification filtering module is used for being connected with a load. In the standby state, the MOS tube Q101 almost consumes no current, so that the current loss in the standby state is effectively reduced, and the purpose of effectively prolonging the service time of the battery is further achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of switching power supply circuits, in particular to a zero-standby input switching power supply circuit. Background Art

[0002] Embedded systems are widely used in portable and highly mobile products, most of which are powered by batteries. Therefore, how to provide a zero-standby input switching power supply circuit to minimize battery power consumption and thus extend battery life is an urgent technical problem to be solved. Utility Model Content

[0003] The purpose of the utility model is to provide a zero standby input switching power supply circuit, which solves the problem of how to reduce battery power consumption and thus extend battery life.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A zero-standby input switching power supply circuit includes a MOS transistor Q101, a transistor Q102, and a rectifier and filter module. The source of the MOS transistor Q101 is connected to a power supply; the collector of the transistor Q102 is connected to the source of the MOS transistor Q101 and the gate of the MOS transistor Q101; the base of the transistor Q102 is connected to a switching signal; the emitter of the transistor Q102 is grounded; the input end of the rectifier and filter module is connected to the drain of the MOS transistor Q101, and the output end of the rectifier and filter module is connected to a load.

[0006] A further technical solution is: the rectifier and filter module includes an electrolytic capacitor EC101; the positive electrode of the electrolytic capacitor EC101 is connected to the drain of the MOS tube Q101, and the positive electrode of the electrolytic capacitor EC101 is used to connect to the load; the negative electrode of the electrolytic capacitor EC101 is connected to GND.

[0007] A further technical solution is: the rectification and filtering module further includes a capacitor C101; one end of the capacitor C101 is connected to the positive electrode of the electrolytic capacitor EC101; and the other end of the capacitor C101 is connected to the negative electrode of the electrolytic capacitor EC101.

[0008] A further technical solution is: the rectification and filtering module further includes a capacitor C102; one end of the capacitor C102 is connected to the positive electrode of the electrolytic capacitor EC101; and the other end of the capacitor C102 is connected to the negative electrode of the electrolytic capacitor EC101.

[0009] A further technical solution is: the zero standby input switching power supply circuit further includes a resistor R101; one end of the resistor R101 is connected to the source of the MOS tube Q101; the other end of the resistor R101 is connected to the collector of the transistor Q102 and the gate of the MOS tube Q101.

[0010] A further technical solution is: the zero standby input switching power supply circuit further includes a resistor R103; one end of the resistor R103 is used to access the switching signal; the other end of the resistor R103 is connected to the base of the transistor Q102.

[0011] A further technical solution is: the zero standby input switching power supply circuit further includes a resistor R102; one end of the resistor R102 is connected to the other end of the resistor R103 and the base of the transistor Q102; the other end of the resistor R102 is connected to the emitter of the transistor Q102.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In standby mode, the MOS tube Q101 consumes almost no current, which effectively reduces the current loss in standby mode and thus effectively extends the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an electrical block diagram of a zero standby input switching power supply circuit in this embodiment;

[0015] Figure 2 4 is a circuit structure topology diagram of a zero standby input switching power supply circuit in this embodiment. DETAILED DESCRIPTION

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

[0017] Embodiment 1: This embodiment provides a zero standby input switching power supply circuit, such as Figure 1 As shown, it includes a MOS transistor Q101, a transistor Q102 and a rectifier and filter module. The source of the MOS transistor Q101 is used to connect to a power supply; the collector of the transistor Q102 is connected to the source of the MOS transistor Q101 and the gate of the MOS transistor Q101; the base of the transistor Q102 is used to receive a switching signal; the emitter of the transistor Q102 is grounded; the input end of the rectifier and filter module is connected to the drain of the MOS transistor Q101, and the output end of the rectifier and filter module is used to connect to a load.

[0018] The working principle of a zero standby input switching power supply circuit provided in this embodiment is as follows:

[0019] When in use, the source of the MOS tube Q101 is connected to the power supply B1, and the output end of the rectifier and filter module is connected to the load.

[0020] In normal operating mode, when the switch signal ON / OFF is high, transistor Q102 conducts, increasing the gate voltage of MOS transistor Q101. At this point, MOS transistor Q101 conducts, and power is supplied to the rectifier and filter module through MOS transistor Q101, thereby supplying power to the load.

[0021] In standby mode, when the ON / OFF switch signal is low, transistor Q102 is turned off, causing the gate voltage of MOS transistor Q101 to drop. At this point, MOS transistor Q101 is turned off, cutting off the current path from the power supply to the load. In standby mode, MOS transistor Q101 consumes almost no current, effectively reducing current loss during standby mode and extending battery life.

[0022] Example 2: Figure 2 As shown, based on the above embodiment 1, in this embodiment, the rectifier and filter module includes an electrolytic capacitor EC101; the positive electrode of the electrolytic capacitor EC101 is connected to the drain of the MOS tube Q101, and the positive electrode of the electrolytic capacitor EC101 is used to be connected to the load; the negative electrode of the electrolytic capacitor EC101 is connected to GND.

[0023] When in use, the source of the MOS tube Q101 is connected to the power supply B1, and the output end of the rectifier and filter module is connected to the load.

[0024] In normal operating mode, when the ON / OFF switching signal is high, transistor Q102 conducts, increasing the gate voltage of MOS transistor Q101. At this point, MOS transistor Q101 conducts, powering the load through it. Electrolytic capacitor EC101 begins charging and filtering the output voltage. Electrolytic capacitor EC101 stores energy during charging and releases it when the power supply voltage fluctuates, maintaining a stable output voltage.

[0025] In standby mode, when the ON / OFF switching signal is low, transistor Q102 turns off, causing the gate voltage of MOS transistor Q101 to drop. At this point, MOS transistor Q101 turns off, severing the current path from the power supply to the load. After MOS transistor Q101 turns off, electrolytic capacitor EC101 releases energy and continues to supply the required current to the load for a certain period of time, until the voltage on electrolytic capacitor EC101 drops to a level insufficient to sustain load operation.

[0026] On the one hand, the electrolytic capacitor EC101 absorbs the high-frequency ripple voltage generated by the switching power supply, effectively smoothing the output voltage and providing a more stable DC power supply to the load. On the other hand, the electrolytic capacitor EC101 effectively filters out high-frequency noise in the power supply output, helping to reduce electromagnetic interference in the system and improve the system's anti-interference ability. Furthermore, the electrolytic capacitor EC101 can store energy for a short period of time and provide continuous current to the load during power switching, thereby helping to improve power conversion efficiency.

[0027] Example 3: Figure 2 As shown, based on the above embodiment 2, in this embodiment, the rectifier and filter module further includes a capacitor C101; one end of the capacitor C101 is connected to the positive electrode of the electrolytic capacitor EC101; and the other end of the capacitor C101 is connected to the negative electrode of the electrolytic capacitor EC101.

[0028] When in use, the source of the MOS tube Q101 is connected to the power supply B1, and the output end of the rectifier and filter module is connected to the load.

[0029] In normal operating mode, when the ON / OFF switch signal is high, transistor Q102 conducts, increasing the gate voltage of MOS transistor Q101. At this point, MOS transistor Q101 conducts, powering the load through it. Electrolytic capacitor EC101 begins charging, and together with capacitor C101, EC101 filters the output voltage. EC101 stores energy during charging and releases it when the power supply voltage fluctuates, maintaining a stable output voltage.

[0030] In standby mode, when the switch signal ON / OFF is low, transistor Q102 turns off, causing the gate voltage of MOS transistor Q101 to drop. At this point, MOS transistor Q101 turns off, severing the current path from the power supply to the load. After MOS transistor Q101 turns off, electrolytic capacitor EC101 releases energy and continues to supply the required current to the load for a certain period of time, until the voltage across EC101 drops to a level insufficient to sustain load operation. During this energy release process, capacitor C101 filters the output voltage.

[0031] By adding capacitor C101, high-frequency noise in the power supply output can be further filtered out, thereby achieving the purpose of enhancing the filtering effect.

[0032] Example 4: Figure 2As shown, based on the above embodiment 3, in this embodiment, the rectifier and filter module further includes a capacitor C102; one end of the capacitor C102 is connected to the positive electrode of the electrolytic capacitor EC101; and the other end of the capacitor C102 is connected to the negative electrode of the electrolytic capacitor EC101.

[0033] When in use, the source of the MOS tube Q101 is connected to the power supply B1, and the output end of the rectifier and filter module is connected to the load.

[0034] In normal operating mode, when the switch signal ON / OFF is high, transistor Q102 conducts, increasing the gate voltage of MOS transistor Q101. At this point, MOS transistor Q101 conducts, powering the load through it. Electrolytic capacitor EC101 begins charging, and electrolytic capacitor EC101, along with capacitors C101 and C102, collectively filter the output voltage. Electrolytic capacitor EC101 stores energy during charging and releases it when the power supply voltage fluctuates, maintaining a stable output voltage.

[0035] In standby mode, when the switch signal ON / OFF is low, transistor Q102 turns off, causing the gate voltage of MOS transistor Q101 to drop. At this point, MOS transistor Q101 turns off, severing the current path from the power supply to the load. After MOS transistor Q101 turns off, electrolytic capacitor EC101 releases energy and continues to supply the required current to the load for a certain period of time, until the voltage on electrolytic capacitor EC101 drops to a level insufficient to sustain load operation. While electrolytic capacitor EC101 releases energy, capacitors C101 and C102 filter the output voltage.

[0036] Electrolytic capacitor EC101 is used to filter and smooth the output voltage at low frequencies, while capacitors C101 and C102 are used to filter out higher frequency noises, thereby further enhancing the filtering effect.

[0037] Example 5: Figure 2 As shown, in this embodiment, based on the above embodiment 1, the zero standby input switching power supply circuit further includes a resistor R101; one end of the resistor R101 is connected to the source of the MOS transistor Q101; the other end of the resistor R101 is connected to the collector of the transistor Q102 and the gate of the MOS transistor Q101.

[0038] The resistance R101 is a bias resistance for stabilizing the gate voltage of the MOS tube Q101. When the transistor Q102 is turned on, the resistance R101 can limit the change speed of the gate voltage, effectively reducing the damage to the MOS tube caused by excessively high voltage spikes. When the transistor Q102 is turned off, the resistance R101 can assist in quickly discharging the gate of the MOS tube Q101, effectively ensuring that the MOS tube can reliably turn off and reducing the leakage current.

[0039] Embodiment 6: as shown in the above embodiment 1, on the basis of the above embodiment 1, in this embodiment, the zero standby input switching power supply circuit further comprises a resistance R103; one end of the resistance R103 is used for connecting the switching signal; the other end of the resistance R103 is connected with the base of the transistor Q102. Figure 2

[0040] In use, the source of the MOS tube Q101 is connected with the power supply B1, and the output end of the rectification and filtering module is connected with the load.

[0041] In the normal working mode, when the switching signal ON / OFF is high, the high level flows into the base of the transistor Q102 through the resistance R103, so that the transistor Q102 is turned on, and then the gate voltage of the MOS tube Q101 is raised. At this time, the MOS tube Q101 is turned on, the power supply supplies power to the load through the MOS tube Q101, the electrolytic capacitor EC101 starts to charge, and the electrolytic capacitor EC101, the capacitor C101 and the capacitor C102 jointly perform filtering processing on the output voltage. The electrolytic capacitor EC101 stores energy during the charging process, and releases energy when the power supply voltage fluctuates, so as to maintain the stability of the output voltage.

[0042] In the standby mode, when the switching signal ON / OFF is low, the low level flows into the base of the transistor Q102 through the resistance R103, so that the transistor Q102 is turned off, and then the gate voltage of the MOS tube Q101 is lowered. At this time, the MOS tube Q101 is turned off, and the current path from the power supply to the load is cut off. After the MOS tube Q101 is turned off, the electrolytic capacitor EC101 releases energy to continue to provide the required current for the load for a certain period of time until the voltage of the electrolytic capacitor EC101 drops to insufficient to maintain the working of the load. During the process of releasing energy of the electrolytic capacitor EC101, the capacitor C101 and the capacitor C102 perform filtering processing on the output voltage.

[0043] ​Resistor R103 is a bias resistor. On the one hand, resistor R103 limits the current flowing into the base of transistor Q102, effectively reducing the risk of excessive base current and damage to transistor Q102 caused by an overly strong switching signal. On the other hand, when the switching signal is switching, resistor R103 smoothes the rising and falling edges of the signal, effectively reducing the risk of malfunction of transistor Q102 due to signal fluctuations at the base voltage.

[0044] Example 7: Figure 2 As shown, based on the above-mentioned embodiment 6, in this embodiment, the zero standby input switching power supply circuit further includes a resistor R102; one end of the resistor R102 is connected to the other end of the resistor R103 and the base of the transistor Q102; the other end of the resistor R102 is connected to the emitter of the transistor Q102.

[0045] The resistor R102 can provide a necessary bias voltage for the transistor Q102 so that the transistor Q102 operates in the amplification region or the saturation region, thereby ensuring that the transistor Q102 can operate stably under different operating conditions.

[0046] Although the present invention has been described herein with reference to a number of illustrative embodiments thereof, it will be understood that numerous other modifications and implementations may be devised by those skilled in the art that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure, the drawings, and the claims, numerous variations and modifications may be made to the components and / or arrangement of the subject combination arrangement. In addition to variations and modifications to the components and / or arrangement, other uses will also be apparent to those skilled in the art.

Claims

1. A zero standby input switching power supply circuit, characterized in that: include: MOS transistor Q101, wherein the source of the MOS transistor Q101 is connected to a power supply; A transistor Q102, wherein the collector of the transistor Q102 is connected to the source of the MOS transistor Q101 and the gate of the MOS transistor Q101; the base of the transistor Q102 is used to receive a switching signal; and the emitter of the transistor Q102 is grounded; A rectifier and filter module, wherein the input end of the rectifier and filter module is connected to the drain of the MOS tube Q101, and the output end of the rectifier and filter module is used to be connected to a load.

2. The zero standby input switching power supply circuit according to claim 1, characterized in that: The rectifier and filter module includes an electrolytic capacitor EC101; The positive electrode of the electrolytic capacitor EC101 is connected to the drain of the MOS transistor Q101, and the positive electrode of the electrolytic capacitor EC101 is used to be connected to a load; The negative electrode of the electrolytic capacitor EC101 is connected to GND.

3. The zero standby input switching power supply circuit according to claim 2, characterized in that: The rectification and filtering module further includes a capacitor C101; One end of the capacitor C101 is connected to the positive electrode of the electrolytic capacitor EC101; The other end of the capacitor C101 is connected to the negative electrode of the electrolytic capacitor EC101.

4. The zero standby input switching power supply circuit according to claim 3, characterized in that: The rectification and filtering module further includes a capacitor C102; One end of the capacitor C102 is connected to the positive electrode of the electrolytic capacitor EC101; The other end of the capacitor C102 is connected to the negative electrode of the electrolytic capacitor EC101.

5. The zero standby input switching power supply circuit according to claim 1, characterized in that: Also included is a resistor R101; One end of the resistor R101 is connected to the source of the MOS transistor Q101; The other end of the resistor R101 is connected to the collector of the transistor Q102 and the gate of the MOS transistor Q101.

6. The zero standby input switching power supply circuit according to claim 1, characterized in that: Also includes resistor R103; One end of the resistor R103 is used to connect the switch signal; The other end of the resistor R103 is connected to the base of the transistor Q102.

7. The zero standby input switching power supply circuit according to claim 6, characterized in that: Also included is a resistor R102; One end of the resistor R102 is connected to the other end of the resistor R103 and the base of the transistor Q102; The other end of the resistor R102 is connected to the emitter of the transistor Q102.

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