Power supply circuit and display device

Abstract

The utility model discloses a power supply circuit and a display device, the power supply circuit comprises a first power supply module and a second power supply module, the first power supply module is used for supplying power to the output end of the power supply circuit, and the second power supply module is used for supplying power to the output end of the power supply circuit; and the voltage detection module is connected with a load voltage and is used for controlling one of the first power supply module and the second power supply module to supply power to the output end of the power supply circuit according to the load voltage, or controlling the first power supply module and the second power supply module to supply power together. The power supply circuit can output different voltages according to the power consumption of the load so as to reduce the power consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially, and it relates to a power supply circuit and display device. BACKGROUND

[0002] At present, display device as the display component of electronic equipment has been widely used in various electronic products. And in the display device, the power supply circuit is often needed to carry out voltage conversion to obtain suitable power voltage. However, the existing power supply circuit has the problem of high power consumption. SUMMARY

[0003] The utility model provides a power supply circuit and display device can export different voltage according to the power consumption of load to reduce power consumption.

[0004] In a first aspect, the utility model provides a power supply circuit, include: first power module and second power module, first power module is used to to the output end of power supply circuit power supply, second power module is used to to the output end of power supply circuit power supply;Voltage detection module, voltage detection module inserts load voltage, is used to according to load voltage control one of first power module and second power module to the output end of power supply circuit carries out power supply, or both power supply.

[0005] Optionally, the voltage detection module includes a voltage comparison unit;The first end of the voltage comparison unit is connected to the load voltage, the second input end of the voltage comparison unit is connected to the reference voltage, the comparison output end of the voltage comparison unit is connected to the first input end of the second power module, and the voltage comparison unit is used to output a first level signal through the comparison output end when the load voltage is greater than the reference voltage;And when the load voltage is less than the reference voltage, a second level signal is output through the comparison output end;The voltage conversion unit is also used to output the first level signal or the second level signal through the comparison output end when the load voltage is equal to the reference voltage;Wherein the first level signal and the second level signal are high and low level signals.

[0006] Optionally, the voltage comparison unit includes a comparator;The inverting input end of the comparator is used as the first input end of the voltage comparison unit, the noninverting input end of the comparator is used as the second input end of the voltage comparison unit, and the output end of the comparator is used as the comparison output end of the voltage comparison unit.

[0007] Optionally, the power supply circuit further includes a reference voltage generation module, the output end of the reference voltage generation module is connected to the second input end of the voltage comparison unit, and the reference voltage generation module is used to generate a reference voltage.

[0008] Optionally, the first power supply module comprises a first voltage conversion unit; a first control end of the first voltage conversion unit is connected to the first enable signal, a second control end of the first voltage conversion unit is connected to the first voltage, and an output end of the first voltage conversion unit is used as an output end of the power supply circuit; the first voltage conversion unit is configured to convert the first voltage into the second voltage in response to the first enable signal.

[0009] Optionally, the first voltage conversion unit comprises a first boost chip, a first transistor, a first inductor and a first diode; an input end of the first boost chip is used as the first control end of the first voltage conversion unit, a first end of the first inductor is used as a second input end of the first voltage conversion unit, a second end of the first inductor, a first pole of the first transistor and an anode of the first diode are connected to a first node, a second pole of the first transistor is grounded, a gate of the first transistor is connected to an output end of the first boost chip, and a cathode of the first diode is used as an output end of the first voltage conversion unit.

[0010] Optionally, the second power supply module comprises a second voltage conversion unit; a first control end of the second voltage conversion unit is connected to the second enable signal and an output end of the voltage detection module, a second control end of the second voltage conversion unit is connected to the first voltage, and an output end of the second voltage conversion unit is electrically connected to the output end of the power supply circuit; the second voltage conversion unit is configured to convert the first voltage into the second voltage in response to the second enable signal or a signal of the output end of the voltage detection module.

[0011] Optionally, a priority of the signal of the output end of the voltage detection module is higher than a priority of the second enable signal.

[0012] Optionally, the second voltage conversion unit comprises a second boost chip, a second transistor, a second inductor and a second diode; an input end of the second boost chip is used as the first control end of the second voltage conversion unit, a first end of the second inductor is used as a second input end of the second voltage conversion unit, a second end of the second inductor, a first pole of the second transistor and an anode of the second diode are connected to a second node, a second pole of the second transistor is grounded, a gate of the second transistor is connected to a first output end of the second boost chip, and a cathode of the second diode is used as an output end of the second voltage conversion unit.

[0013] Optionally, the first voltage conversion unit further comprises a first voltage stabilizing capacitor; a first end of the first voltage stabilizing capacitor is connected to the cathode of the first diode, and a second end of the first voltage stabilizing capacitor is grounded; optionally, the second voltage conversion unit further comprises a second voltage stabilizing capacitor; a first end of the second voltage stabilizing capacitor is connected to the cathode of the second diode, and a second end of the second voltage stabilizing capacitor is grounded.

[0014] Optionally, the power supply circuit further comprises a switch module; the switch module is connected between the output end of the first voltage conversion unit and the output end of the second voltage conversion unit, and the switch module is used for being turned on or turned off according to the signal of the second output end of the second boost chip.

[0015] Optionally, the switch module comprises a third transistor; the first pole of the third transistor is connected with the output end of the first voltage conversion unit; the second pole of the third transistor is connected with the output end of the second voltage conversion unit; and the gate of the third transistor is connected with the second output end of the second boost chip.

[0016] In a second aspect, the utility model provides a kind of display device, comprising the power supply circuit provided by any embodiment of the utility model.

[0017] The power supply circuit provided by the utility model includes a first power module, a second power module, and a voltage detection module. The voltage detection module controls one of the first power module and the second power module to supply power to the output end of the power supply circuit according to the load voltage, or both supply power. When the load operates in a high-power mode, the first power module and the second power module work simultaneously to meet the load voltage requirement. When the load operates in a low-power mode, only the first power module works, and the static power consumption of the second power module is zero, which can save power consumption. That is, the power supply circuit of the utility model can output different voltages according to the power consumption of the load to reduce power consumption.

[0018] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0020] Figure 1 is a structural schematic view of a power supply circuit provided by the utility model embodiment;

[0021] Figure 2 is a structural schematic view of another power supply circuit provided by the utility model embodiment;

[0022] Figure 3 is a structural schematic view of another power supply circuit provided by the utility model embodiment;

[0023] Figure 4 is a structure schematic diagram of another power supply circuit provided by the embodiment of the present application;

[0024] Figure 5 is a structure schematic diagram of another power supply circuit provided by the embodiment of the present application;

[0025] Figure 6 is a structure schematic diagram of another power supply circuit provided by the embodiment of the present application;

[0026] Figure 7 is a structure schematic diagram of another power supply circuit provided by the embodiment of the present application;

[0027] Figure 8 is a structure schematic diagram of a display device provided by the embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0029] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] As mentioned in the background art, the existing power supply circuit has the problem of high power consumption, and the inventor has found through careful research that the cause of this technical problem is that:

[0031] The power supply circuit designed for the power requirement of the display device in the low-power consumption mode is different from the power requirement in the high-power consumption mode. However, in order to meet the power requirement of the display device in the high-power consumption mode, the power supply circuit can only be designed according to the power requirement in the high-power consumption mode, that is, no matter what power consumption mode the load connected to the power supply circuit works in, the power supply circuit can only output the same voltage. Therefore, when the display device is in a low-power consumption mode working state, the power supply circuit has the problem of high power consumption.

[0032] In order to reduce the power consumption of the power supply circuit, the utility model provides a novel power supply circuit structure. Figure 1 It is a kind of power supply circuit structure schematic diagram provided by the utility model embodiment, as shown in Figure 1 The power supply circuit includes: first power module 10 and second power module 20, first power module 10 is used to supply power to the output terminal VOUT of power supply circuit, and second power module 20 is used to supply power to the output terminal VOUT of power supply circuit.

[0033] Voltage detection module 30, voltage detection module 30 is connected to load voltage V3_2, is used to control one of first power module 10 and second power module 20 to supply power to the output terminal VOUT of power supply circuit according to load voltage V3_2, or both supply power.

[0034] Specifically, first power module 10 and second power module 20 can convert input alternating current or direct current into specific voltage required by load.For example, 5V direct current can be converted into 24V direct current.First power module 10 and second power module 20 can have the same structure, or different structure.The voltage output by first power module 10 and second power module 20 can be the same, or different.Preferably, the voltage output by first power module 10 and second power module 20 is the same, which can reduce the risk of current backflow, thereby reducing the risk of damage to power module (including first power module 10 and second power module 20), and improving the service life of power module.Current backflow refers to the flow of current from one power module to another power module under certain conditions.In the circuit, the flow direction of current is from high potential to low potential.If the output voltage of two power modules is different, a potential difference will be formed between them.When there is a path in the circuit connecting the two power modules, due to the existence of potential difference, current may flow from the power module with higher voltage to the power module with lower voltage, thereby causing current backflow phenomenon.When the output voltage of two power modules is the same, the potential difference between them is zero, and there is no power to drive current flow, greatly reducing the possibility of current backflow.It should be noted that when the power supply circuit starts to supply power to the load, first power module 10 and second power module 20 supply power to the output terminal VOUT of power supply circuit together.

[0035] Load voltage V3_2 refers to the voltage borne by the load connected across the power supply in the circuit.The power supply circuit provides electric energy, and the load is the part of consuming electric energy, such as motor, display device, etc.When current passes through the load, a certain voltage will be generated across the load, which is the load voltage.When the power supply circuit drives the display device, the display device can operate in multiple modes, such as low-power mode and high-power mode.

[0036] When the display device operates in low power consumption mode, the load voltage V3_2 connected to the voltage detection module 30 is relatively small. At this time, the voltage detection module 30 can output a first level signal, which can cause one of the first power supply module 10 and the second power supply module 20 to stop supplying power to the output terminal VOUT of the power supply circuit.

[0037] When the display device operates in a high power consumption mode, the load voltage V3_2 connected to the voltage detection module 30 is large. At this time, the voltage detection module 30 can output a second level signal. The second level signal can enable the first power supply module 10 and the second power supply module 20 to continue to supply power to the output terminal VOUT of the power supply circuit, that is, the first power supply module 10 and the second power supply module 10 jointly supply power to the output terminal VOUT of the power supply circuit. In other words, when the display device operates in different power consumption modes, the power supply circuit of the present invention can output different voltages, thereby reducing power consumption. The first level signal and the second level signal are high and low level signals to each other. For example, the first level signal is a low level signal, and the second level signal is a high level signal.

[0038] It will be appreciated that whether the voltage detection module 30 controls the first power module 10 or the second power module 20 to stop / continue supplying power to the output terminal VOUT of the power supply circuit depends on whether the output terminal of the voltage detection module 30 is connected to the first control terminal EN1 of the first power module 10 or the first control terminal EN2 of the second power module 20. When the output terminal of the voltage detection module 30 is connected to the first control terminal EN1 of the first power module 10, the voltage detection module 30 is configured to control the first power module 10 to continue or stop supplying power to the output terminal VOUT of the power supply circuit based on the load voltage.

[0039] When the output terminal of the voltage detection module 30 is connected to the first control terminal EN2 of the second power supply module 20, the voltage detection module 30 is configured to control the second power supply module 20 to continue or stop supplying power to the output terminal VOUT of the power supply circuit based on the load voltage V3_2. This embodiment and the following embodiments are described using the example of the output terminal of the voltage detection module 30 being connected to the first control terminal EN2 of the second power supply module 20.

[0040] by Figure 1 Taking the circuit structure shown as an example, the specific working process of the power supply circuit provided by the embodiment of the utility model is as follows:

[0041] The first power module 10 and the second power module 20 are powered on and start working. The first power module 10 and the second power module 20 jointly supply power to the output terminal VOUT of the power circuit. "Powering on" refers to the process of connecting power to the power circuit to start working.

[0042] When the load voltage V3_2 accessed by the voltage detection module 30 is large, that is, the power consumption of the load connected by the power supply circuit is high, the output end of the voltage detection module 30 outputs a first level signal, and the second power supply module 20 stops working according to the received first level signal, at this time the first power supply module 10 continues to supply power to the output end VOUT of the power supply circuit.

[0043] When the load voltage V3_2 accessed by the voltage detection module 30 is small, that is, the power consumption of the load connected by the power supply circuit is low, the output end of the voltage detection module 30 outputs a second level signal, and the second power supply module 20 continues to supply power to the output end VOUT of the power supply circuit according to the received second level signal. That is, when the load voltage V3_2 accessed by the voltage detection module 30 is small, the first power supply module 10 and the second power supply module 20 supply power to the output end VOUT of the power supply circuit together.

[0044] The power supply circuit provided by the utility model includes first power supply module, second power supply module and voltage detection module, voltage detection module controls one of first power supply module and second power supply module to supply power to the output end of power supply circuit according to load voltage, or both supply power together. When the load runs in high power consumption mode, the first power supply module and the second power supply module work simultaneously, and the load voltage demand is met. When the load runs in low power consumption mode, only the first power supply module works, and the static power consumption of the second power supply module is zero at this time, which can save power consumption. That is, the power supply circuit of the utility model can output different voltages according to the power consumption of the load to reduce power consumption.

[0045] Figure 2 It is another structure schematic view of power supply circuit provided by the utility model embodiment. The embodiment is based on the above-mentioned embodiment, as shown in Figure 2 Optionally, the voltage detection module 30 includes a voltage comparison unit 302.

[0046] The first input end of the voltage comparison unit 302 is connected to the load voltage, the second input end of the voltage comparison unit 302 is connected to the reference voltage VREF, the comparison output end OUT1 of the voltage comparison unit 302 is connected to the first input end of the second power supply module 20, and the voltage comparison unit 302 is used for outputting a first level signal through the comparison output end OUT1 when the load voltage V3_2 is greater than the reference voltage VREF, and outputting a second level signal through the comparison output end OUT1 when the load voltage V3_2 is less than the reference voltage VREF; and the voltage comparison unit 302 is also used for outputting the first level signal or the second level signal through the comparison output end OUT1 when the load voltage V3_2 is equal to the reference voltage VREF. Wherein the first level signal and the second level signal are high and low level signals respectively. For example, the first level signal is a low level signal, and the second level signal is a high level signal. It should be noted that the comparison output end OUT1 of the voltage comparison unit 302 is the output end of the voltage detection module 30 in the above embodiment.

[0047] It should be noted that when the load voltage V3_2 is equal to the reference voltage VREF, the voltage comparison unit 302 can output the first level signal or the second level signal. The reason is that: first, in actual application, a completely accurate equal state may be difficult to appear stably. Due to noise, interference and measurement inaccuracy in the circuit and other factors, even at the moment when the load voltage V3_2 and the reference voltage VREF are theoretically equal, the actual circuit state may have a slight fluctuation in a very short time, and it is difficult to determine an absolutely stable output state. Therefore, a certain flexibility is allowed in the design under the condition of approximate equality, and outputting the first level signal or the second level signal will not have a serious error impact on the main function of the overall system.

[0048] Secondly, from the functional requirement point of view, in some cases, the processing of the equal state does not need to strictly distinguish whether it is the first level signal or the second level signal. As long as there is a clear different level signal output to trigger the corresponding operation when the load voltage V3_2 is greater than or less than the reference voltage VREF, and the specific output of the first level signal or the second level signal in the equal state can be selected according to the other requirements of the system or the convenience of the design, it is not necessary to have a fixed single output.

[0049] As an optional implementation manner provided by the embodiment, Figure 3 is a structural schematic diagram of another power supply circuit provided by the embodiment of the utility model, which is combined with Figure 2 and Figure 3Optionally, the voltage comparison unit 302 comprises a comparator U1, an inverting input end IN- of the comparator U1 as a first input end of the voltage comparison unit 302, a non-inverting input end IN+ of the comparator U1 as a second input end of the voltage comparison unit 302, and an output end of the comparator U1 as a comparison output end OUT1 of the voltage comparison unit 302.

[0050] With reference to Figure 3 The specific working process of the power supply circuit is as follows:

[0051] The first power supply module 10 and the second power supply module 20 start working after being powered on, and the first power supply module 10 and the second power supply module 20 jointly supply power to the output end VOUT of the power supply circuit.

[0052] Suppose the load current is Ir, that is, the current flowing through the load R1 is Ir, and the load voltage V3_2 is the voltage V3_1 of the output end of the power supply circuit minus the voltage across the load R1, that is, V3_2 = V3_1 - Ir * r1, and r1 represents the resistance of the load R1. Define the working current that a single power supply module can provide as Ia, and the load current range is 0-2*Ia, the load current 0-0.8*Ia is in a low-power mode, and 0.8*Ia-2*Ia is in a high-power mode. At this time, the reference voltage VREF can be set to V3_1-0.8*Ia*r1.

[0053] In actual work, when the load current Ir is 0≤Ir<0.8*Ia, the load voltage V3_2 is greater than the reference voltage VREF at this time, the comparator U1 outputs a first level signal (that is, a low level signal), and the second power supply module 20 stops working according to the received first level signal, at this time the first power supply module 10 continues to supply power to the output end VOUT of the power supply circuit. That is, when the load current Ir is 0≤Ir<0.8*Ia, only the first power supply module 10 supplies power to the output end VOUT of the power supply circuit.

[0054] When the load current Ir is 0.8*Ia≤Ir≤2*Ia, the load voltage V3_2 is less than the reference voltage VREF at this time, the comparator U1 outputs a second level signal (that is, a high level signal), and the second power supply module 20 continues to supply power to the output end VOUT of the power supply circuit according to the received second voltage. That is, when the load current Ir is 0.8*Ia≤Ir≤2*Ia, the first power supply module 10 and the second power supply module 20 jointly supply power to the output end VOUT of the power supply circuit.

[0055] Figure 4 is another structural schematic diagram of a power supply circuit provided by the embodiment of the utility model, like Figure 4As shown, the first power supply module 10 comprises a first voltage conversion unit 101; a first control end of the first voltage conversion unit 101 is connected with the first enable signal SIN1, a second control end of the first voltage conversion unit 101 is connected with the first voltage V1, and an output end of the first voltage conversion unit 101 is used as the output end VOUT of the power supply circuit, and the first voltage conversion unit 101 is used for converting the first voltage V1 into a second voltage in response to the first enable signal SIN1. The second voltage is the voltage output by the output end VOUT of the power supply circuit. Optionally, the second voltage is greater than the first voltage V1.

[0056] Figure 5 is a structural schematic diagram of another power supply circuit provided by the embodiment of the utility model, as shown in Figure 5 As an optional implementation provided by the embodiment, the first voltage conversion unit 101 comprises a first boost chip IC1, a first transistor T1, a first inductor L1 and a first diode D1. The input end of the first boost chip IC1 is used as the first control end of the first voltage conversion unit 101, the first end of the first inductor L1 is used as the second input end of the first voltage conversion unit 101, the second end of the first inductor L1, the first pole of the first transistor T1 and the anode of the first diode D1 are connected to the first node N1, the second pole of the first transistor T1 is grounded, the gate of the first transistor T1 is connected with the output end of the first boost chip IC1, and the cathode of the first diode D1 is used as the output end of the first voltage conversion unit 101. It should be noted that the first control end of the first voltage conversion unit 101 is used as the first control end EN1 of the first power supply module 10.

[0057] Optionally, continuing to refer to Figure 4 The second power supply module 20 comprises a second voltage conversion unit 201; a first control end of the second voltage conversion unit 201 is connected with the second enable signal SIN2 and the output end of the voltage detection module 30, a second control end of the second voltage conversion unit 201 is connected with the first voltage V1, and the output end of the second voltage conversion unit 201 is electrically connected with the output end VOUT of the power supply circuit, and the second voltage conversion unit 201 is used for converting the first voltage V1 into a second voltage in response to the second enable signal SIN2 or the signal of the output end of the voltage detection module 30.

[0058] As an optional implementation provided by the embodiment, continuing to refer to Figure 5The second voltage conversion unit 201 includes a second boost chip IC2, a second transistor T2, a second inductor L2, and a second diode D2. The input terminal of the second boost chip IC2 serves as the first input terminal of the second voltage conversion unit 201, the first terminal of the second inductor L2 serves as the second input terminal of the second voltage conversion unit 201, the second terminal of the second inductor L2, the first electrode of the second transistor T2, and the anode of the second diode D2 are connected to the second node N2, the second electrode of the second transistor T2 is grounded, the gate of the second transistor T2 is connected to the first output terminal of the second boost chip IC2, and the cathode of the second diode D2 serves as the output terminal of the second voltage conversion unit 201. It should be noted that the first control terminal of the second voltage conversion unit 201 serves as the first control terminal EN2 of the second power supply module 20.

[0059] Optionally, the priority of the signal at the output end of the voltage detection module 30 is higher than the priority of the second enable signal SIN2. Since the second input end of the second voltage conversion unit 201 is simultaneously connected to the second enable signal SIN2 and the signal at the output end of the voltage detection module 30 (hereinafter referred to as the signal at the output end of the voltage detection module 30 is the enable control signal), there will be a signal conflict. By setting the priority of the signal at the output end of the voltage detection module 30 to be higher than the priority of the second enable signal SIN2, the second voltage conversion unit 201 can only respond to the enable control signal when the second enable signal SIN2 and the enable control signal are present at the same time, thereby avoiding signal conflicts. It is understandable that the second input end of the second voltage conversion unit 201 is connected to the second enable signal SIN2 in order to further activate the operation of the second voltage conversion unit 201 after the power circuit is powered on. It is understandable that the enable control signal includes a first level signal and a second level signal.

[0060] In some embodiments, when the enable control signal conflicts with the second enable signal SIN2, the second boost chip IC2 can prioritize the signals based on pre-defined characteristics. For example, the high-priority signal may have specific signatures, frequencies, or waveform characteristics. The second boost chip IC2 determines the signal priority by identifying these characteristics.

[0061] Optionally, the first voltage conversion unit 101 further includes a first voltage-stabilizing capacitor C1; a first end of the first voltage-stabilizing capacitor C1 is connected to the cathode of the first diode D1, and a second end of the first voltage-stabilizing capacitor C1 is grounded. The second voltage conversion unit 201 further includes a second voltage-stabilizing capacitor C2; a first end of the second voltage-stabilizing capacitor C2 is connected to the cathode of the second diode D2, and a second end of the second voltage-stabilizing capacitor C2 is grounded.

[0062] by Figure 5 Taking the circuit structure shown in FIG. 1 as an example, the specific working process of the power supply circuit provided in this embodiment is as follows:

[0063] The first voltage conversion unit 101 and the second voltage conversion unit 201 start to work, and the first voltage conversion unit 101 and the second voltage conversion unit 201 jointly supply power to the output terminal VOUT of the power supply circuit.

[0064] When the load voltage is greater than the reference voltage, the voltage detection module 30 outputs a first level signal (for example, a low level signal) at the output terminal, that is, the signal at the input terminal of the second voltage boost chip IC2 is the first level signal at this time, and the second voltage boost chip IC2 stops working. Since the second voltage boost chip IC2 stops working, it is unable to continue to output the on level signal to the gate of the second transistor T2, and the second transistor T2 is turned off. At this time, the second voltage conversion unit 201 stops supplying power to the output terminal VOUT of the power supply circuit, and the first voltage conversion unit 101 continues to supply power to the output terminal VOUT of the power supply circuit.

[0065] When the load voltage is less than the reference voltage, the voltage detection module 30 outputs a second level signal (for example, a high level signal) at the output terminal, that is, the signal at the input terminal of the second voltage boost chip IC2 is the second level signal at this time, and the second voltage boost chip IC2 continues to work normally and outputs the on level signal. The second transistor T2 is turned on based on the on level signal. The second voltage conversion unit 201 normally supplies power to the output terminal VOUT of the power supply circuit. That is, when the load voltage is less than the reference voltage, the first voltage conversion unit 101 and the second voltage conversion unit 201 jointly supply power to the output terminal VOUT of the power supply circuit.

[0066] Among them, the on level signal output by the second voltage boost chip IC2 is a signal for controlling the on of the second transistor T2. In some embodiments, when the second transistor T2 is an N-channel transistor, the on level signal is a high level signal; in other embodiments, when the second transistor T2 is a P-channel transistor, the on level signal is a low level signal.

[0067] Continuing to refer to Figure 5, although when the second voltage boosting chip IC2 stops working, that is, the first output end of the second voltage boosting chip IC2 does not output the on level signal, the second transistor T2 is turned off, and the second voltage conversion unit 201 stops supplying power to the output end VOUT of the power supply circuit, but due to the existence of the second voltage stabilizing capacitor C2, and the second voltage stabilizing capacitor C2 is connected in parallel with the first voltage stabilizing capacitor C1, that is, the second voltage stabilizing capacitor C2 increases the capacitance value in the first voltage conversion unit 101, so that the output voltage of the first voltage conversion unit 101 is affected, and then the voltage of the output end VOUT of the power supply circuit is affected. Therefore, in order to prevent the second voltage stabilizing capacitor C2 from affecting the output voltage of the first voltage conversion unit 101 when the second voltage boosting chip IC2 stops working, the embodiment of the utility model adds a switch module to isolate the circuit connection between the first voltage conversion unit 101 and the second voltage conversion unit 201, that is, to isolate the connection between the first voltage stabilizing capacitor C1 and the second voltage stabilizing capacitor C2.

[0068] Figure 6 is another structure diagram of a power supply circuit provided by the embodiment of the utility model, as shown in Figure 6 Optionally, the power supply circuit further comprises a switch module 40; the switch module 40 is connected between the output end of the first voltage conversion unit 101 and the output end of the second voltage conversion unit 201, and the switch module 40 is used for turning on or turning off according to the signal of the second output end of the second voltage boosting chip IC2.

[0069] As an optional implementation manner provided by the embodiment, the switch module 40 comprises a third transistor T3, the first pole of the third transistor T3 is connected with the output end of the first voltage conversion unit 101, the second pole of the third transistor T3 is connected with the output end of the second voltage conversion unit 201, and the gate of the third transistor T3 is connected with the second output end of the second voltage boosting chip IC2.

[0070] The embodiment of the utility model passes through setting third transistor T3, when the second voltage boosting chip IC2 stops working in response to the first level signal, the first output end and the second output end of the second voltage boosting chip IC2 simultaneously stop outputting the on level signal, controls second transistor T2 and third transistor T3 to turn off, thereby avoiding that the second voltage stabilizing capacitor C2 affects the output voltage of the first voltage conversion unit 101 when the second voltage boosting chip IC2 stops working.

[0071] Figure 7 is another structure diagram of a power supply circuit provided by the embodiment of the utility model, as shown in Figure 7 Optionally, the power supply circuit comprises a first power supply module 10, a second power supply module 20 and a voltage detection module 30.

[0072] Optionally, the voltage detection module 30 comprises a voltage comparison unit 302, and the voltage comparison unit 302 comprises a comparator U1.

[0073] Optionally, the first power supply module 10 comprises a first voltage conversion unit 101, the first voltage conversion unit 101 comprising a first boost chip IC1, a first transistor T1, a first inductor L1, a first diode D1 and a first voltage stabilizing capacitor C1. The second power supply module 20 comprises a second voltage conversion unit 201, the second voltage conversion unit 201 comprising a second boost chip IC2, a second transistor T2, a second inductor L2, a second diode D2 and a second voltage stabilizing capacitor C1. Optionally, the power supply circuit further comprises a switch module 40, the switch module 40 comprising a third transistor T3.

[0074] Optionally, the power supply circuit further comprises a reference voltage generation module 50, an output terminal of the reference voltage generation module 50 being connected with a second input terminal of the voltage comparison unit 302, the reference voltage generation module 50 being configured to generate a reference voltage VREF.

[0075] With the circuit structure shown in FIG. 1 as an example, the specific working process of the power supply circuit provided in the embodiments of the present application is as follows: Figure 7

[0076] The first voltage conversion unit 101 and the second voltage conversion unit 201 start working after being powered on, and the first voltage conversion unit 101 and the second voltage conversion unit 201 jointly supply power to the output terminal VOUT of the power supply circuit.

[0077] Suppose the load current is Ir, i.e. the current flowing through the load R1 is Ir, and the load voltage V3_2 is the voltage V3_1 of the output terminal of the power supply circuit minus the voltage across the load R1, i.e. V3_2=V3_1-Ir*r1, r1 representing the resistance of the load R1. Define the working current that can be provided by a single power supply module as Ia, and the range of the load current is 0-2*Ia, the load current 0-0.8*Ia is in a low-power consumption mode, and the load current 0.8*Ia-2*Ia is in a high-power consumption mode. At this time, the reference voltage VREF can be set as V3_1-0.8*Ia*r1.

[0078] ​In actual work, when the load current Ir is 0≤Ir<0.8*Ia, the voltage of the load voltage V3_2 is greater than the reference voltage VREF at this time, the comparator U1 outputs a first level signal (i.e. a low level signal), that is, the signal of the input end of the second boost chip IC2 is the first level signal at this time, the second boost chip IC2 stops working, the first output end and the second output end of the second boost chip IC2 stop outputting the on level signal, the second transistor T2 and the third transistor T3 are turned off, and the second voltage conversion unit 201 stops supplying power to the output end VOUT of the power supply circuit at this time. That is, when the load current Ir is 0≤Ir<0.8*Ia, the first voltage conversion unit 101 continues to supply power to the output end VOUT of the power supply circuit, and the second voltage conversion unit 201 stops supplying power to the output end VOUT of the power supply circuit.

[0079] When the load current Ir is 0.8*Ia≤Ir≤2*Ia, the load voltage V3_2 is less than or equal to the reference voltage VREF at this time, the comparator U1 outputs a second level signal (i.e. a high level signal), that is, the signal of the input end of the second boost chip IC2 is the second level signal at this time, the second boost chip IC2 continues to work normally, the first output end and the second output end of the second boost chip IC2 both output the on level signal, and the second transistor T2 and the third transistor T3 are controlled to be turned on. At this time, the second voltage conversion unit 201 normally supplies power to the output end VOUT of the power supply circuit. That is, when the load current Ir is 0.8*Ia≤Ir≤2*Ia, the first voltage conversion unit 101 and the second voltage conversion unit 201 jointly supply power to the output end VOUT of the power supply circuit.

[0080] In summary, the power supply circuit can realize that the second power module automatically switches the on / off state according to the load voltage. When the load runs in a high-power consumption mode, the first power module and the second power module work simultaneously, and the load voltage demand is met. When the load runs in a low-power consumption mode, only the first power module works, and the static power consumption of the second power module is zero, so that power consumption can be saved.

[0081] The utility model embodiment further provides a display device including the power supply circuit of any of the above embodiments, having the corresponding functional modules and beneficial effects of the power supply circuit. The display device further includes a display panel, for example, the display panel can be an OLED display panel or a liquid crystal display panel. Figure 8 is a structural schematic diagram of a display device provided by the utility model embodiment, in the utility model embodiment, the display device can be Figure 8The shown mobile phone can also be any electronic product with display function, including but not limited to the following categories: TV, notebook computer, desktop display, tablet computer, digital camera, smart bracelet, smart glasses, vehicle-mounted display, medical equipment, industrial control equipment, touch interaction terminal, etc., and the embodiments of the present application do not specially limit this.

[0082] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized by comprising: The application relates to a power supply circuit, comprising: a first power supply module and a second power supply module, the first power supply module being used for supplying power to an output end of the power supply circuit, and the second power supply module being used for supplying power to the output end of the power supply circuit; a voltage detection module, which is connected to a load voltage and is used for controlling one of the first power supply module and the second power supply module to supply power to the output end of the power supply circuit or for controlling both of the first power supply module and the second power supply module to supply power to the output end of the power supply circuit according to the load voltage.

2. The power supply circuit of claim 1, wherein, The voltage detection module comprises a voltage comparison unit; a first input end of the voltage comparison unit is connected to the load voltage, a second input end of the voltage comparison unit is connected to a reference voltage, and a comparison output end of the voltage comparison unit is connected to a first control end of the second power supply module; the voltage comparison unit is used for outputting a first level signal through the comparison output end when the load voltage is greater than the reference voltage; and outputting a second level signal through the comparison output end when the load voltage is less than the reference voltage; the voltage comparison unit is also used for outputting the first level signal or the second level signal through the comparison output end when the load voltage is equal to the reference voltage; wherein the first level signal and the second level signal are high and low level signals respectively.

3. The power supply circuit of claim 2, wherein, The voltage comparison unit comprises a comparator; an inverting input end of the comparator is used as the first input end of the voltage comparison unit, a non-inverting input end of the comparator is used as the second input end of the voltage comparison unit, and an output end of the comparator is used as the comparison output end of the voltage comparison unit.

4. The power supply circuit of claim 2, wherein The application further comprises a reference voltage generation module, an output end of the reference voltage generation module being connected to the second input end of the voltage comparison unit, and the reference voltage generation module being used for generating the reference voltage.

5. The power supply circuit of claim 1, wherein The first power supply module comprises a first voltage conversion unit; a first control end of the first voltage conversion unit is connected to a first enable signal, a second control end of the first voltage conversion unit is connected to a first voltage, an output end of the first voltage conversion unit being used as the output end of the power supply circuit, and the first voltage conversion unit being used for converting the first voltage into a second voltage in response to the first enable signal; Preferably, the first voltage conversion unit comprises a first boost chip, a first transistor, a first inductor and a first diode; an input end of the first boost chip is used as the first control end of the first voltage conversion unit, a first end of the first inductor is used as the second input end of the first voltage conversion unit, a second end of the first inductor, a first electrode of the first transistor and an anode of the first diode are connected to a first node, a second electrode of the first transistor is grounded, a gate of the first transistor is connected to an output end of the first boost chip, and a cathode of the first diode is used as the output end of the first voltage conversion unit.

6. The power supply circuit of claim 5, wherein, The second power supply module comprises a second voltage conversion unit; The first control end of the second voltage conversion unit is connected to a second enable signal, and the output end of the voltage detection module is connected to the first control end of the second voltage conversion unit. The second control end of the second voltage conversion unit is connected to the first voltage, and the output end of the second voltage conversion unit is electrically connected to the output end of the power supply circuit. The second voltage conversion unit is configured to convert the first voltage into a second voltage in response to the second enable signal or the signal of the output end of the voltage detection module. Preferably, the priority of the signal of the output end of the voltage detection module is higher than the priority of the second enable signal. Preferably, the second voltage conversion unit comprises a second boost chip, a second transistor, a second inductor and a second diode. The input end of the second boost chip serves as the first control end of the second voltage conversion unit. The first end of the second inductor serves as the second input end of the second voltage conversion unit. The second end of the second inductor, the first pole of the second transistor and the anode of the second diode are connected to a second node. The second pole of the second transistor is grounded. The gate of the second transistor is connected to the first output end of the second boost chip. The cathode of the second diode serves as the output end of the second voltage conversion unit.

7. The power supply circuit of claim 6, wherein, The first voltage conversion unit further comprises a first voltage stabilizing capacitor. The first end of the first voltage stabilizing capacitor is connected to the cathode of the first diode, and the second end of the first voltage stabilizing capacitor is grounded. Preferably, the second voltage conversion unit further comprises a second voltage stabilizing capacitor. The first end of the second voltage stabilizing capacitor is connected to the cathode of the second diode, and the second end of the second voltage stabilizing capacitor is grounded.

8. The power supply circuit of claim 7, wherein, The switching module is connected between the output end of the first voltage conversion unit and the output end of the second voltage conversion unit. The switching module is configured to be turned on or turned off according to the signal of the second output end of the second boost chip. The switching module comprises a third transistor. The first pole of the third transistor is connected to the output end of the first voltage conversion unit. The second pole of the third transistor is connected to the output end of the second voltage conversion unit. The gate of the third transistor is connected to the second output end of the second boost chip.

9. The power supply circuit of claim 8, wherein, The power supply circuit comprises the power supply circuit according to any one of claims 1-9.

10. A display device, characterized by comprising: ​

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