Low-power-consumption switching power supply control circuit

Abstract

The utility model relates to a low-power-consumption switching power supply control circuit, which comprises a power supply output end provided with a + 5V output end for supplying power to a display panel, and + 12V and + 15V output ends for supplying power to a main control panel; the control circuit is composed of a control chip pin, an optical coupler IC23 and an MOS tube Q12, the control chip pin outputs a DRWUP signal, the optical coupler IC23 is connected with the control chip pin and the MOS tube Q12, and the MOS tube Q12 is connected with a + 12V output end and a main control board load; the switching power supply circuit comprises a first energy storage element E1, a second energy storage element E9 and a switching power supply chip IC2, the first energy storage element E1 is connected with a + 12V output end and a source electrode of an MOS tube Q12, the second energy storage element E9 is connected with a + 15V output end and a main control board load, and an input end of the switching power supply chip IC2 is connected with a + 12V output end; the relay assembly is composed of a relay, a triode Q9 and an MOS tube Q11, the control end of the relay is connected with the output end of the switching power supply chip IC2 and connected with the MOS tube Q11 through the triode Q9, and the MOS tube Q11 is connected with the + 15V output end and a main control board load. The circuit realizes low-power-consumption power supply and ensures stable operation of each component.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low -power consumption switching power supply technical field, concretely relates to a low -power consumption switching power supply control circuit. BACKGROUND

[0002] In the conventional air conditioner split application scene, the control board of indoor unit is usually used to supply power to the outdoor unit drive board, when the air conditioner is in standby state, the indoor unit closes the power supply relay, so that the outdoor unit is in power-off state, only the indoor unit keeps power on, in this way, the standby power consumption is effectively reduced.

[0003] However, the structure of mobile air conditioner is different from the conventional split, it is generally equipped with only main control board and display board, the main control board undertakes the whole power supply task of mobile air conditioner, and has the dual role of indoor unit and outdoor unit power supply control in conventional split. This leads to that in standby state, if the conventional way is adopted, it is difficult to realize the low power consumption mode similar to the outdoor unit power-off of split, the standby power consumption of existing mobile air conditioner is often high, which cannot meet the increasingly stringent energy saving requirements.

[0004] Therefore, the utility model provides a low -power consumption switching power supply control circuit to solve the above -mentioned technical problem. UTILITY MODEL CONTENTS

[0005] In view of the above problems, the utility model aims at providing a low -power consumption switching power supply control circuit, which realizes low -power consumption power supply and guarantees stable operation of each component.

[0006] The utility model provides a low -power consumption switching power supply control circuit, which comprises:

[0007] The power output end comprises +5V output end, +12V output end and +15V output end, the +5V output end +5V is used to power the display board, and the +12V output end and the +15V output end are used to power the main control board;

[0008] The control circuit comprises control chip pin, optocoupler IC23 and MOS tube Q12, the control chip pin is used to output DR_WUP signal, the light emitting side of optocoupler IC23 is connected with the control chip pin, the control side of optocoupler IC23 is connected with the gate of MOS tube Q12, the drain of MOS tube Q12 is connected with the +12V output end, and the source of MOS tube Q12 is connected with main control board load;

[0009] The switch power supply circuit comprises a first energy storage element E1, a second energy storage element E9 and a switch power supply chip IC2 connected with each other, the first energy storage element E1 is connected between the +12V output end and the source electrode of the MOS tube Q12, the second energy storage element E9 is connected between the +15V output end and the main control board load, and the input end of the switch power supply chip IC2 is connected with the +12V output end.

[0010] The relay assembly comprises a relay, a triode Q9 and a MOS tube Q11, the control end of the relay is connected with the output end of the switch power supply chip IC2, the normally open contact of the relay is connected with the base electrode of the triode Q9, the emitter electrode of the triode Q9 is grounded, the collector electrode of the triode Q9 is connected with the gate electrode of the MOS tube Q11, the drain electrode of the MOS tube Q11 is connected with the +15V output end, and the source electrode of the MOS tube Q11 is connected with the main control board load.

[0011] Preferably, the control circuit further comprises a resistor R192, a capacitor C81, a resistor R40, a resistor R42, a resistor R50, a voltage stabilizing diode DZ1 and a resistor R11; the first end of the resistor R192 is connected with the control chip pin, the first end of the capacitor C81 and the light emitting side of the optocoupler IC23 at the same time, the second end of the resistor R192 is connected with the second end of the capacitor C81, the first end of the resistor R40 and the light emitting side of the optocoupler IC23 at the same time, and the second end of the resistor R40 is grounded; the first end of the resistor R42 is connected with the control side of the optocoupler IC23, the second end of the resistor R42 is connected with the first end of the resistor R50, the positive electrode end of the voltage stabilizing diode DZ1 and the gate electrode of the MOS tube Q12 at the same time, the second end of the resistor R50 is connected with the main control board load, the negative electrode end of the voltage stabilizing diode DZ1 is connected with the source electrode of the MOS tube Q12 and the main control board load at the same time.

[0012] Preferably, the control circuit further comprises a resistor R11 connected between the drain electrode of the MOS tube Q12 and the +12V output end.

[0013] Preferably, the relay assembly further comprises resistance R12 and resistance R60 connected between the normally open contact of the relay and the triode Q9, resistance R13, resistance R18 and seventh voltage stabilizing diode DZ7 connected between the triode Q9 and the MOS tube Q11, and resistance R38 connected between the MOS tube Q11 and the +15V output end; the first end of the resistance R12 is connected with the normally open contact of the relay, the second end of the resistance R12 is connected with the first end of the resistance R60 and the base of the triode Q9, the second end of the resistance R60 is connected with the emitter of the triode Q9 and then grounded; the first end of the resistance R13 is connected with the collector of the triode Q9, the second end of the resistance R13 is connected with the first end of the resistance R18, the positive end of the seventh voltage stabilizing diode DZ7 and the gate of the MOS tube Q11, the second end of the resistance R18 is connected with the negative end of the seventh voltage stabilizing diode DZ7 and the source of the MOS tube Q11 and then connected with the main control board load.

[0014] Preferably, the first energy storage element E1 and the second energy storage element E9 are electrolytic capacitors.

[0015] Compared with the related art, the low-power consumption switching power supply control circuit has the following beneficial effects: 1. low-power consumption power supply is realized, the DR_WUP signal output by the control chip pin is low level during standby, the optocoupler IC23 and the MOS tube Q12 cooperate to make the current output by the +12V output end and the +15V output end not flow to the main control board load, standby power consumption is greatly reduced, and the equipment battery endurance is prolonged; 2. accurate and stable power supply, the +5V output end, the +12V output end and the +15V output end adapt different loads, the first energy storage element E1, the second energy storage element E9 and the switching power supply chip IC2 guarantee voltage stability, and the operation reliability is improved; 3. quick switching machine response, the level of the DR_WUP signal output by the control chip pin changes instantaneously, the circuit quickly acts, and state switching can be completed within a few milliseconds, thereby meeting the instant use demand. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a circuit structure schematic diagram of the low-power consumption switching power supply control circuit of the utility model;

[0017] Figure 2 Fig. 2 is a connection schematic diagram of the power supply output end and the control circuit in the utility model;

[0018] Figure 3 Fig. 3 is a circuit structure schematic diagram of the switching power supply circuit in the utility model;

[0019] Figure 4The utility model discloses a relay assembly's circuit structure schematic drawing. DETAILED DESCRIPTION

[0020] The utility model provides a low -power consumption switching power supply control circuit, it is in order to solve traditional switching power supply control circuit's insufficient problem in power consumption control aspect.

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the utility model.

[0022] Please refer to the drawings, and the utility model provides a low -power consumption switching power supply control circuit, including: Figures 1-4

[0023] The power output end 1 includes +5V output end 11, +12V output end 12 and +15V output end 13, and the +5V output end 11 is used to power the display board, and the +12V output end 12 and the +15V output end 13 are used to power the main control board.

[0024] The control circuit 2 includes control chip pin 21, optocoupler IC 23 and MOS tube Q12, the control chip pin 21 is used to output DR_WUP signal, the light side of optocoupler IC 23 is connected with control chip pin 21, the control side of optocoupler IC 23 is connected with the gate of MOS tube Q12, the drain of MOS tube Q12 is connected with +12V output end, and the source of MOS tube Q12 is connected with main control board load.

[0025] The switching power supply circuit 3 includes first energy storage element E1, second energy storage element E9 and switching power supply chip IC2 connected with each other, the first energy storage element E1 is connected between +12V output end 12 and the source of MOS tube Q12, the second energy storage element E9 is connected between +15V output end 13 and main control board load, and the input end of switching power supply chip IC2 is connected with +12V output end 12.

[0026] ​A relay assembly 4 including a relay 41, a triode Q9 and a MOS tube Q11, the control end of the relay 41 is connected with the output end of the switching power supply chip IC2, the normally open contact of the relay 41 is connected with the base of the triode Q9, the emitter of the triode Q9 is grounded, the collector of the triode Q9 is connected with the gate of the MOS tube Q11, the drain of the MOS tube Q11 is connected with the +15V output end 13, and the source of the MOS tube Q11 is connected with the main control board load.

[0027] In the above structure, the +5V output end 11 can be accurately positioned, providing stable power support for the display panel, ensuring normal operation of the display function, meeting the specific requirements of the display panel for voltage, and the +12V output end 12 cooperates with the +15V output end to jointly deliver energy to the main control board, ensuring the normal operation of various elements on the main control board, and providing a solid power foundation for the entire control circuit; The control chip pin 21 bears the responsibility of outputting the DR_WUP signal, which determines the switching of the working state of the subsequent circuit, the light-emitting side of the optocoupler IC23 is connected with the control chip pin 21, which can sensitively perceive the level change of the DR_WUP signal, the control side of the optocoupler IC23 is connected with the gate of the MOS tube Q12, forming an effective conversion and transmission channel for optical and electrical signals, when the light-emitting side of the optocoupler IC23 receives a DR_WUP signal with different levels, the control side will change the conduction state accordingly, and then accurately control the on-off of the MOS tube Q12; The drain of the MOS tube Q12 is reliably connected with the +12V output end, and the source is connected with the main control board load, through the control of the optocoupler IC23 on the gate of the MOS tube Q12, intelligent management and control of the +12V power supply path are realized, ensuring that the +12V current can be distributed as needed under different working conditions, avoiding unnecessary power waste; The first energy storage element E1 is connected between the +12V output end 12 and the source of the MOS tube Q12, which plays the role of "energy buffer pool" during the operation of the circuit, when the power supply of the +12V output end 12 fluctuates or is temporarily interrupted, the first energy storage element E1 can release the stored energy in time to maintain the voltage stability on the source side of the MOS tube Q12, ensuring that the subsequent main control board load will not be affected by the sudden change of power supply; The second energy storage element E9 is connected between the +15V output end 13 and the main control board load, which has the same principle as above, and is used to provide energy reserve to ensure the stable operation of the elements on the main control board that rely on the +15V output end 13 for power supply; The input end of the switching power supply chip IC2 is connected with the +12V output end 12, the switching power supply chip IC2 as the core control chip of the switching power supply circuit is responsible for efficiently converting, stabilizing and processing the +12V voltage input by the +12V output end 12, outputting stable power that meets the requirements of the circuit, and driving the normal operation of the entire system.

[0028] Specifically, the control circuit 2 further comprises a resistor R192, a capacitor C81, a resistor R40, a resistor R42, a resistor R50, a voltage stabilizing diode DZ1 and a resistor R11; a first end of the resistor R192 is connected to the control chip pin 21, a first end of the capacitor C81 and a light emitting side of the optocoupler IC23, a second end of the resistor R192 is connected to a second end of the capacitor C81, a first end of the resistor R40 and the light emitting side of the optocoupler IC23, a second end of the resistor R40 is grounded; a first end of the resistor R42 is connected to a control side of the optocoupler IC23, a second end of the resistor R42 is connected to a first end of the resistor R50, a positive end of the voltage stabilizing diode DZ1 and a gate of the MOS tube Q12, a second end of the resistor R50 is connected to a load of the main control board, a negative end of the voltage stabilizing diode DZ1 is connected to a source of the MOS tube Q12 and the load of the main control board. The structure is arranged to effectively protect the gate of the MOS tube Q12 by voltage division and current limiting of multiple resistors; and the voltage stabilizing diode DZ1 is arranged to ensure that the gate and source voltage of the MOS tube Q12 is stable within a safe range, avoiding overvoltage damage.

[0029] In the embodiment, the low-power consumption switching power supply control circuit further comprises a resistor R11 connected between the drain of the MOS tube Q12 and the +12V output end. The resistor R11 is arranged to limit current, which can prevent excessive current impact during switching of the working state of the circuit, protecting the MOS tube Q12 and related circuit elements.

[0030] Further, the relay assembly 4 further comprises a resistor R12 and a resistor R60 connected between the normally open contact of the relay 41 and the triode Q9, a resistor R13, a resistor R18 and a seventh voltage stabilizing diode DZ7 connected between the triode Q9 and the MOS tube Q11, and a resistor R38 connected between the MOS tube Q11 and the +15V output end 13; a first end of the resistor R12 is connected to the normally open contact of the relay 41, a second end of the resistor R12 is connected to a first end of the resistor R60 and a base of the triode Q9, a second end of the resistor R60 is connected to an emitter of the triode Q9 and then grounded; a first end of the resistor R13 is connected to a collector of the triode Q9, a second end of the resistor R13 is connected to a first end of the resistor R18, a positive end of the seventh voltage stabilizing diode DZ7 and a gate of the MOS tube Q11, a second end of the resistor R18 is connected to a negative end of the seventh voltage stabilizing diode DZ7, a source of the MOS tube Q11 and then connected to a load of the main control board.

[0031] In the structure, the resistor R12 and the resistor R60 are connected between the normally open contact of the relay 41 and the triode Q9, play the role of current limiting, voltage dividing, prevent the over high voltage impact the base of the triode Q9 in the action moment of the relay 41, guarantee the stable work of the triode Q9;The resistor R13, the resistor R18 and the seventh stabilizing diode DZ7 are connected between the triode Q9 and the MOS tube Q11, are used for voltage dividing, current limiting to protect the gate of the MOS tube Q11, the stabilizing diode DZ7 is used for stabilizing the gate-source voltage of the MOS tube Q11, ensure its reliable work;The resistor R38 connected between the MOS tube Q11 and the +15V output terminal 13 plays the role of current limiting, avoids the over large current impact in the turn-on moment of the MOS tube Q11, protects the whole power supply circuit and load.

[0032] In the embodiment, the first energy storage element E1 and the second energy storage element E9 are electrolytic capacitors.

[0033] It should be noted that the working principle of the low-power switch power supply control circuit of the utility model is as follows:

[0034] When in standby state:

[0035] When the DR_WUP signal output by the control chip pin 21 is low, at this time, it is in standby state. Because the DR_WUP signal output by the control chip pin 21 directly controls the light emitting side of the optocoupler IC23, the low level makes the light emitting side of the optocoupler IC23 in non-conduction state, and then its control side is not conductive. In this case, the voltage VGS between the gate and the source of the MOS tube Q12 is high, according to the conduction characteristics of the MOS tube, the MOS tube Q12 is not conductive at this time, which means that the current output by the +12V output terminal can only flow through the first energy storage element E1, and cannot flow to the drive side of the main control board, so that the drive side is in power-off state. The switch power supply chip IC2 cannot control the relay 41 because of no power, and for the same reason, under this standby logic, the current output by the +15V output terminal can only flow through the second energy storage element E9, and cannot flow through the main control board load (such as compressor module and fan module), so as to realize extremely low standby power consumption and achieve the purpose of energy saving.

[0036] When in the start-up state:

[0037] When the DR_WUP signal output by the control chip pin 21 becomes high level, the starting process is started. The high level DR_WUP signal makes the light emitting side of the optocoupler IC 23 conduct, and the light signal is quickly transmitted to the control side, so that the control side of the optocoupler IC 23 is turned on. Once the control side of the optocoupler IC 23 is turned on, the gate voltage of the MOS tube Q12 is pulled low, the voltage VGS between the gate and the source of the MOS tube Q12 becomes low level, the MOS tube Q12 is turned on. At this time, the current output by the +12V output terminal 12 can flow into the switching power supply chip IC2 through the MOS tube Q12, power supply for the switching power supply chip IC2, so that it is powered on and works. After the switching power supply chip IC2 works, the output terminal voltage rises, and the relay 41 becomes high level, which drives the triode Q9 to turn on. After the triode Q9 is turned on, the signal is transmitted to the MOS tube Q11, so that the voltage VGS between the gate and the source of the MOS tube Q11 becomes low level, and the MOS tube Q11 is turned on. Finally, the current output by the +15V output terminal 13 flows into the main control board load (such as compressor module and fan module) through the MOS tube Q11, realizing the overall power supply of the main control board and the key load after starting, and ensuring the normal operation of the machine.

[0038] Compared with the related art, the low-power-consumption switching power supply control circuit has the following beneficial effects: 1. Low-power-consumption power supply is realized. The DR_WUP signal output by the control chip pin is low level during standby, and the optocoupler IC 23 and the MOS tube Q12 cooperate to make the current output by the +12V output terminal and the +15V output terminal not flow to the main control board load, greatly reducing the standby power consumption and prolonging the equipment battery endurance; 2. Accurate and stable power supply. The +5V output terminal, the +12V output terminal and the +15V output terminal adapt to different loads, and the first energy storage element E1, the second energy storage element E9 and the switching power supply chip IC2 guarantee voltage stability, improving the operation reliability; 3. The switching machine responds quickly. The level change of the DR_WUP signal output by the control chip pin is instantaneous, and the circuit quickly acts to complete the state switching within a few milliseconds, meeting the instant use demand.

[0039] The above-mentioned embodiments should be understood as illustrative rather than limiting the scope of the present application, and the protection scope of the present application is subject to the claims. For those skilled in the art, some non-essential improvements and adjustments of the present application without departing from the essence and scope of the present application still belong to the protection scope of the present application.

Claims

1. A low-power switching power supply control circuit, characterized in that, The low-power switching power supply control circuit comprises: a power output end comprising a +5V output end, a +12V output end and a +15V output end; the +5V output end is used for powering a display panel, and the +12V output end and the +15V output end are used for powering a main control panel; a control circuit comprising a control chip pin, an optocoupler IC23 and a MOS tube Q12; the control chip pin is used for outputting a DR_WUP signal; a light-emitting side of the optocoupler IC23 is connected with the control chip pin, a control side of the optocoupler IC23 is connected with a gate of the MOS tube Q12, a drain of the MOS tube Q12 is connected with the +12V output end, and a source of the MOS tube Q12 is connected with a main control panel load; a switching power supply circuit comprising a first energy storage element E1, a second energy storage element E9 and a switching power supply chip IC2 connected with each other; the first energy storage element E1 is connected between the +12V output end and the source of the MOS tube Q12; the second energy storage element E9 is connected between the +15V output end and the main control panel load; and an input end of the switching power supply chip IC2 is connected with the +12V output end; a relay assembly comprising a relay, a triode Q9 and a MOS tube Q11; a control end of the relay is connected with an output end of the switching power supply chip IC2; a normally open contact of the relay is connected with a base of the triode Q9; an emitter of the triode Q9 is grounded; a collector of the triode Q9 is connected with a gate of the MOS tube Q11; a drain of the MOS tube Q11 is connected with the +15V output end; and a source of the MOS tube Q11 is connected with the main control panel load.

2. The low power consumption switching power supply control circuit according to claim 1, wherein The control circuit further comprises a resistor R192, a capacitor C81, a resistor R40, a resistor R42, a resistor R50, a voltage stabilizing diode DZ1 and a resistor R11; a first end of the resistor R192 is connected with the control chip pin, a first end of the capacitor C81 and a light-emitting side of the optocoupler IC23 at the same time; a second end of the resistor R192 is connected with a second end of the capacitor C81, a first end of the resistor R40 and a light-emitting side of the optocoupler IC23 at the same time; a second end of the resistor R40 is grounded; a first end of the resistor R42 is connected with a control side of the optocoupler IC23; a second end of the resistor R42 is connected with a first end of the resistor R50, a positive electrode end of the voltage stabilizing diode DZ1 and a gate of the MOS tube Q12 at the same time; a second end of the resistor R50 is connected with the main control panel load; a negative electrode end of the voltage stabilizing diode DZ1 is connected with the source of the MOS tube Q12 and the main control panel load at the same time.

3. The low power consumption switching power supply control circuit according to claim 2, wherein The control circuit further comprises the resistor R11 connected between the drain of the MOS tube Q12 and the +12V output end.

4. The low power consumption switching power supply control circuit according to claim 3, wherein The relay assembly further comprises resistance R12 and resistance R60 connected between the normally open contact of the relay and the transistor Q9, resistance R13, resistance R18 and seventh voltage stabilizing diode DZ7 connected between the transistor Q9 and the MOS transistor Q11, and resistance R38 connected between the MOS transistor Q11 and the +15V output terminal; the first end of the resistance R12 is connected with the normally open contact of the relay, the second end of the resistance R12 is connected with the first end of the resistance R60 and the base of the transistor Q9, the second end of the resistance R60 is connected with the emitter of the transistor Q9 and then grounded; the first end of the resistance R13 is connected with the collector of the transistor Q9, the second end of the resistance R13 is connected with the first end of the resistance R18, the positive end of the seventh voltage stabilizing diode DZ7 and the gate of the MOS transistor Q11, the second end of the resistance R18 is connected with the negative end of the seventh voltage stabilizing diode DZ7 and the source of the MOS transistor Q11 and then connected with the load of the main control board.

5. The low power consumption switching power supply control circuit according to claim 1, wherein The first energy storage element E1 and the second energy storage element E9 are electrolytic capacitors.

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