A low self-dissipation power supply switching control circuit

Abstract

This utility model relates to the field of power control circuit technology and discloses a low self-power power switch control circuit, including an external power supply, a control signal input module, a switch drive module, a main power switch module, a protection clamping module, a filtering and stabilizing module, and a control signal anti-interference filtering module. The output terminal of the external power supply is electrically connected to the input terminal of the main power switch module, the output terminal of the control signal anti-interference filtering module is electrically connected to the input terminal of the control signal input module, and the output terminal of the main power switch module is electrically connected to both the protection clamping module and the filtering and stabilizing module. The protection clamping module is connected in parallel between the control terminal and the power input terminal of the main power switch module. In this utility model, through the coordinated connection of the modules, precise control of the power path is achieved, reducing its own power consumption when the circuit is not working or in a sleep state, thus meeting the power management requirements of low-power devices.

Description

Technical Field

[0001] This utility model relates to the field of power control circuit technology, and in particular to a low self-consumption power switch control circuit. Background Technology

[0002] A power switch uses a circuit to control a switching transistor to turn it on and off at high speed, converting direct current into high-frequency alternating current to supply the transformer for voltage transformation, thereby generating one or more sets of voltages as needed.

[0003] A search revealed a control circuit and a switching power supply circuit for a switching circuit in publication number CN206117487U. This invention discloses a control circuit and a switching power supply circuit for a switching circuit. By detecting the output voltage or output current in the circuit, when the output voltage is lower than a preset reference voltage or when the output current is lower than a preset reference current, the upper and lower limits of the inductor current are increased; when the output voltage is higher than the preset reference voltage or when the output current is higher than the preset reference current, the upper and lower limits of the inductor current are decreased. The inductor current in the circuit is sampled to obtain a sampled current. When the sampled current rises to the upper limit of the inductor current, the main switch in the control circuit is turned off; when the sampled current reaches the lower limit of the inductor current, the main switch is turned on. This invention provides a very fast transient response in the switching power supply circuit when the output voltage or current increases or decreases, with minimal output voltage drop and no overshoot during voltage recovery.

[0004] The aforementioned applications exhibit high self-power consumption in standby or non-working states, leading to reduced battery life, increased system power consumption, and impacting device performance and usage time. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a low self-power consumption power switch control circuit, which aims to improve the problem of high self-power consumption of the circuit.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low self-dissipation power switch control circuit, comprising an external power supply, a control signal input module, a switch drive module, a main power switch module, a protection clamping module, a filtering and stabilizing module, and a control signal anti-interference filtering module. The output terminal of the external power supply is electrically connected to the input terminal of the main power switch module. The output terminal of the control signal anti-interference filtering module is electrically connected to the input terminal of the control signal input module. The output terminal of the control signal input module is electrically connected to the input terminal of the switch drive module. The output terminal of the switch drive module is electrically connected to the control terminal of the main power switch module. The output terminal of the main power switch module is electrically connected to the protection clamping module and the filtering and stabilizing module, respectively. The protection clamping module is connected in parallel between the control terminal and the power input terminal of the main power switch module.

[0007] The above technical solution involves: powering the circuit with an external power source; the control signal is input to the control signal module, processed by it, and then controlled by the switch drive module to switch the main power switch module on and off; the filter stabilization module connected to the output of the main power switch module makes the output more stable; and the protection clamping module is connected in parallel between the control terminal and the power input terminal of the main power switch module to prevent it from being damaged by overvoltage. The modules work together to achieve low-power and high-efficiency circuit control.

[0008] Preferably, the control signal anti-interference filtering module includes a capacitor C14, one end of which is electrically connected to the input terminal of the control signal input module, and the other end is grounded.

[0009] The above technical solution uses capacitor C14 to form a low-pass filter, which filters out high-frequency interference and improves the signal's anti-interference capability.

[0010] Preferably, the control signal input module includes an ON / OFF control signal interface, a resistor R43, a transistor Q11, and a resistor R15. The output terminal of the ON / OFF control signal interface is electrically connected to one end of the resistor R43, the other end of the resistor R43 is electrically connected to the base of the transistor Q11, one end of the resistor R15 is electrically connected to the base of the transistor Q11, and the other end is grounded. The emitter of the transistor Q11 is grounded, and the collector is electrically connected to the input terminal of the switch drive module.

[0011] The above technical solution involves receiving a signal through the ON / OFF control signal interface, which then drives transistor Q11 after current limiting by resistor R43. Resistor R15 provides bias for Q11 and ensures reliable cutoff when there is no signal. The collector output of Q11 controls the switch driver module.

[0012] Preferably, the switch drive module includes a resistor R14, one end of which is electrically connected to the output terminal of the control signal input module, and the other end is electrically connected to the control terminal of the main power switch module.

[0013] Through the above technical solution, resistor R14 serves as a current limiter and signal buffer, ensuring reliable driving of the main power switch module.

[0014] Preferably, the main power switching module includes a P-channel MOSFET Q10, the source of which is electrically connected to an external power supply, the drain of which is electrically connected to the input terminal of the filter stabilization module, and the gate of which is electrically connected to the output terminal of the switch driving module.

[0015] The above technical solution involves connecting the source of the P-channel MOSFET Q10 to an external power supply, connecting the drain to a filter and stabilization module, and controlling the gate by a switch drive module. The power supply is switched on and off by controlling the gate-source voltage.

[0016] Preferably, the protection clamping module includes a Zener diode D21, the anode of which is electrically connected to the control terminal of the main power switch module, and the cathode of which is electrically connected to the power input terminal of the main power switch module.

[0017] The above technical solution involves connecting the anode of Zener diode D21 to the control terminal of the main power switch module and the cathode to the power input terminal. When the voltage at the control terminal exceeds the breakdown voltage of D21, it conducts in reverse, limiting the voltage amplitude and protecting the P-channel MOSFET from overvoltage damage.

[0018] Preferably, the filter stabilization module includes a capacitor C13, one end of which is electrically connected to the output terminal of the main power switch module, and the other end is grounded.

[0019] The above technical solution involves connecting capacitor C13 in parallel between the output terminal of the main power switching module and ground. This smooths the output voltage through charging and discharging, reducing ripple and improving power supply stability.

[0020] Preferably, the emitter of transistor Q11 in the control signal input module, the ground terminal of capacitor C14 in the control signal anti-interference filter module, and the ground terminal of capacitor C13 in the filter stabilization module are electrically connected through the same common ground terminal.

[0021] The above technical solution involves connecting the emitter of transistor Q11 and the ground terminals of capacitors C14 and C13 to the same common ground, eliminating ground potential differences, ensuring a unified signal reference point, reducing interference, and improving circuit stability.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, through the coordinated connection of an external power supply, a control signal input module, a switch drive module, a main power switch module, a protection clamping module, and a filter stabilization module, precise control of the power supply path is achieved, reducing its own power consumption when the circuit is not working or in a sleep state, thus meeting the power management needs of low-power devices.

[0024] 2. In this utility model, the input control signal is effectively filtered by the control signal anti-interference filtering module, which reduces the influence of external high-frequency interference on the signal and improves the stability and anti-interference capability of the circuit in response to control commands. Attached Figure Description

[0025] Figure 1 This is a circuit connection diagram of a low self-consumption power supply switch control circuit proposed in this utility model.

[0026] Figure 2 This is a schematic block diagram of the overall module of a low self-consumption power switch control circuit proposed in this utility model.

[0027] Figure 3 This is a schematic block diagram of the control signal input module of a low self-consumption power switch control circuit proposed in this utility model;

[0028] Figure 4 This is a schematic block diagram of a switch drive module for a low self-consumption power supply switch control circuit proposed in this utility model.

[0029] Figure 5 This is a schematic block diagram of the main power switch module of a low self-consumption power switch control circuit proposed in this utility model.

[0030] Figure 6 This is a schematic block diagram of a protection clamping module for a low self-consumption power switch control circuit proposed in this utility model.

[0031] Figure 7 This utility model presents a schematic block diagram of a filter stabilization module for a low self-consumption power switch control circuit.

[0032] Figure 8 This utility model presents a schematic block diagram of a control signal anti-interference filtering module for a low self-consumption power switch control circuit. Detailed Implementation

[0033] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Reference Figure 1 and Figure 2 This utility model provides an embodiment of a low self-consumption power switch control circuit, including an external power supply, a control signal input module, a switch drive module, a main power switch module, a protection clamp module, a filter stabilization module, and a control signal anti-interference filter module. The output terminal of the external power supply is electrically connected to the input terminal of the main power switch module. The output terminal of the control signal anti-interference filter module is electrically connected to the input terminal of the control signal input module. The output terminal of the control signal input module is electrically connected to the input terminal of the switch drive module. The output terminal of the switch drive module is electrically connected to the control terminal of the main power switch module. The output terminal of the main power switch module is electrically connected to the protection clamp module and the filter stabilization module respectively. The protection clamp module is connected in parallel between the control terminal and the power input terminal of the main power switch module.

[0035] Specifically, power input is formed by connecting an external power supply to the input terminal of the main power switch module. After receiving the signal, the control signal input module transmits it to the control terminal of the main power switch module through the switch drive module, realizing precise control of power on and off. In standby mode, the main power switch module is reliably cut off, reducing overall self-power consumption. The output terminal of the main power switch module is connected to both a protection clamping module and a filter stabilization module. The protection clamping module is connected in parallel between the control terminal and the power input terminal of the main power switch module, which can clamp overvoltage at the control terminal in real time to prevent damage to the main power components due to sudden high voltage. The filter stabilization module smooths out output voltage fluctuations, reduces interference caused by load changes, and improves the stability and safety of the circuit operation. Through the combination of these modules, a low-power and high-stability effect is achieved.

[0036] Reference Figure 1 and Figure 8 The control signal anti-interference filtering module includes capacitor C14, one end of which is electrically connected to the input terminal of the control signal input module, and the other end is grounded.

[0037] Specifically, capacitor C14 in the control signal anti-interference filtering module forms a single-pole low-pass filter structure. One end of it is directly connected to the input terminal of the control signal input module, and the other end is grounded to form a high-frequency noise discharge path. This allows capacitor C14 and the input impedance of the control signal input module to form an RC filter network to filter external control signals. When high-frequency interference signals intrude along the signal line, capacitor C14 utilizes its characteristic that capacitive reactance decreases as frequency increases to quickly guide the high-frequency components to the ground terminal, while the low-frequency effective control signal passes smoothly. This achieves selective suppression of interference signals and improves the reliability and stability of the control circuit.

[0038] Reference Figure 3 The control signal input module includes an ON / OFF control signal interface, a resistor R43, a transistor Q11, and a resistor R15. The output terminal of the ON / OFF control signal interface is electrically connected to one end of the resistor R43, and the other end of the resistor R43 is electrically connected to the base of the transistor Q11. One end of the resistor R15 is electrically connected to the base of the transistor Q11, and the other end is grounded. The emitter of the transistor Q11 is grounded, and the collector is electrically connected to the input terminal of the switch drive module.

[0039] Specifically, the control signal input module receives external commands through the ON / OFF control signal interface. The voltage signal is converted into a controllable current by a current limiting circuit consisting of resistor R43 and transistor Q11 (NPN type transistor). Then, resistor R15 establishes a base bias voltage, forming a stable signal amplification and conversion structure. When the control signal is high, R43 limits the current flowing into the base of Q11 to prevent overcurrent damage. At the same time, the voltage divider between R15 and R43 ensures that the base voltage is within a safe range. When the control signal is low, R15 pulls the base potential to ground, so that Q11 is reliably cut off, avoiding false triggering caused by leakage current and improving the circuit's anti-interference capability.

[0040] Reference Figure 4 The switch drive module includes a resistor R14, one end of which is electrically connected to the output terminal of the control signal input module, and the other end is electrically connected to the control terminal of the main power switch module.

[0041] Specifically, when the control signal input module outputs a high level, R14 limits the current flowing into the gate of the P-channel MOSFET Q10 to prevent the surge current generated by the rapid charging of the gate capacitor from damaging the drive circuit; when the control signal is low, R14 and the gate-source capacitor of Q10 form a discharge circuit to slowly release the gate charge, so that Q10 is turned off smoothly, enabling the circuit to work efficiently and achieve low standby power consumption.

[0042] Reference Figure 5The main power switching module includes a P-channel MOSFET Q10. The source of the P-channel MOSFET Q10 is electrically connected to an external power supply, the drain is electrically connected to the input terminal of the filter stabilization module, and the gate is electrically connected to the output terminal of the switch drive module.

[0043] Specifically, the main power switching module constructs a high-efficiency power control channel through a P-channel MOSFET Q10. Its source is directly connected to the positive terminal of the external power supply, and its drain is connected to the filter stabilization module, forming a low-impedance power transmission path. The gate receives control signals through the switch driver module to achieve rapid on / off control of the power supply. When the switch driver module outputs a high level, the gate-source voltage of Q10 exceeds the threshold, and the P-channel MOSFET enters the conduction state. The power from the external power supply is transferred to the load through the source and drain of Q10. The extremely low on-resistance of Q10 minimizes power loss. When the control signal is low, Q10 quickly turns off, cutting off the connection between the power supply and the load, further improving the power supply quality.

[0044] Reference Figure 6 The protection clamping module includes a Zener diode D21, with the anode of the Zener diode D21 electrically connected to the control terminal of the main power switch module and the cathode electrically connected to the power input terminal of the main power switch module.

[0045] Specifically, the protection clamping module constructs a voltage limiting protection mechanism through Zener diode D21. Its anode is connected to the gate of the P-channel MOSFET Q10, which is the control terminal of the main power switch module, and its cathode is connected to the source of the power input terminal Q10, forming a reverse breakdown protection channel across the gate and source. When external interference or voltage spikes generated during switching exceed the breakdown voltage of D21, D21 breaks down, clamping the gate voltage of Q10 within a safe range and enhancing the stability of the circuit.

[0046] Reference Figure 7 The filter stabilization module includes capacitor C13, one end of which is electrically connected to the output terminal of the main power switching module, and the other end is grounded.

[0047] Specifically, the filter stabilization module constructs a low-impedance energy storage and ripple suppression channel through capacitor C13. One end of C13 is connected to the drain of the P-channel MOSFET Q10 at the output terminal of the main power switching module, and the other end is grounded, forming a dynamic buffer structure for power supply to the load. When Q10 is turned on, C13 charges and stores energy; when Q10 is turned off, C13 releases energy to maintain the load current. This charging and discharging process limits the fluctuation of the output voltage to a small range, enabling the circuit to maintain the stability of the output voltage under complex operating conditions.

[0048] Reference Figure 3 , Figure 7 and Figure 8The emitter of transistor Q11 in the control signal input module, the ground terminal of capacitor C14 in the control signal anti-interference filter module, and the ground terminal of capacitor C13 in the filter stabilization module are electrically connected through the same common ground terminal.

[0049] Specifically, it is well known that all three are grounded together. By eliminating the potential difference caused by the difference in grounding paths, a unified potential reference is constructed. The emitter is directly connected to the common ground, which stabilizes the reference point of the base bias voltage and avoids the drift of the on / off threshold caused by ground potential fluctuations, ensuring that Q11 responds accurately to the control signal. The common ground provides a low-impedance high-frequency noise discharge path, so that when the interference signal is directly introduced to the ground terminal through C14, there is no additional impedance loss, and the filtering efficiency is improved. For C13, the common ground ensures that its reference ground during charging and discharging is consistent with the control circuit, avoiding the increase of output voltage ripple caused by ground potential difference, making the smoothing effect of the filter stabilization module on the output voltage better, and enhancing the overall reliability.

[0050] Working principle: The external power supply is connected through the P-channel MOSFET Q10 of the main power switching module. After receiving the external signal, the transistor Q11, resistor R43, and resistor R15 of the control signal input module transmit the control logic to the gate of the P-channel MOSFET Q10 through the switch drive module resistor R14, realizing the conduction / cutoff of the transistor Q11 and the linkage with the conduction / cutoff of the P-channel MOSFET Q10. The Zener diode D21 of the protection clamping module prevents the P-channel MOSFET Q10 from being damaged by overvoltage through the gate-to-source connection. The capacitor C13 of the filter stabilization module smooths the output voltage fluctuation, realizing the low leakage current characteristic in the standby state and ensuring the stability and safety of power output.

[0051] The capacitor C14 in the control signal anti-interference filtering module performs pre-filtering on the external input signal, effectively filtering out high-frequency noise and improving the circuit's anti-interference capability in complex electromagnetic environments.

[0052] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low self-dissipation power supply switch control circuit, comprising an external power supply, a control signal input module, a switch drive module, a main power switch module, a protection clamping module, a filtering and stabilization module, and a control signal anti-interference filtering module, characterized in that: The output terminal of the external power supply is electrically connected to the input terminal of the main power switch module. The output terminal of the control signal anti-interference filter module is electrically connected to the input terminal of the control signal input module. The output terminal of the control signal input module is electrically connected to the input terminal of the switch drive module. The output terminal of the switch drive module is electrically connected to the control terminal of the main power switch module. The output terminal of the main power switch module is electrically connected to the protection clamp module and the filter stabilization module respectively. The protection clamp module is connected in parallel between the control terminal and the power input terminal of the main power switch module.

2. A low self-consumption power supply switch control circuit according to claim 1, characterized in that: The control signal anti-interference filtering module includes a capacitor C14, one end of which is electrically connected to the input terminal of the control signal input module, and the other end is grounded.

3. The low self-consumption power supply switch control circuit according to claim 1, characterized in that: The control signal input module includes an ON / OFF control signal interface, a resistor R43, a transistor Q11, and a resistor R15. The output terminal of the ON / OFF control signal interface is electrically connected to one end of the resistor R43, and the other end of the resistor R43 is electrically connected to the base of the transistor Q11. One end of the resistor R15 is electrically connected to the base of the transistor Q11, and the other end is grounded. The emitter of the transistor Q11 is grounded, and the collector is electrically connected to the input terminal of the switch drive module.

4. A low self-consumption power supply switch control circuit according to claim 1, characterized in that: The switch drive module includes a resistor R14, one end of which is electrically connected to the output terminal of the control signal input module, and the other end is electrically connected to the control terminal of the main power switch module.

5. A low self-consumption power supply switch control circuit according to claim 1, characterized in that: The main power switching module includes a P-channel MOSFET Q10. The source of the P-channel MOSFET Q10 is electrically connected to an external power supply, the drain is electrically connected to the input terminal of the filter stabilization module, and the gate is electrically connected to the output terminal of the switch driving module.

6. A low self-consumption power supply switch control circuit according to claim 1, characterized in that: The protection clamping module includes a Zener diode D21, the anode of which is electrically connected to the control terminal of the main power switch module, and the cathode of which is electrically connected to the power input terminal of the main power switch module.

7. A low self-consumption power supply switch control circuit according to claim 1, characterized in that: The filtering and stabilizing module includes a capacitor C13, one end of which is electrically connected to the output terminal of the main power switching module, and the other end is grounded.

8. A low self-consumption power supply switch control circuit according to claim 1, characterized in that: The emitter of transistor Q11 in the control signal input module, the ground terminal of capacitor C14 in the control signal anti-interference filter module, and the ground terminal of capacitor C13 in the filter stabilization module are electrically connected through the same common ground terminal.

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