Power supply circuit and electronic equipment

Abstract

The embodiment of the utility model discloses a power supply circuit and electronic equipment. A first control signal generation circuit, a second control signal generation circuit and a signal output circuit are arranged in a power supply circuit, a first control signal is generated based on the first control signal generation circuit, the second control signal generation circuit is connected with the first control signal generation circuit, and a second control signal is generated according to the first control signal; and the second control signal controls the signal output circuit to output a first power supply signal. Therefore, the adjustment of the power supply signal can be realized according to the demand of the load at a relatively low cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, especially to a power supply circuit and electronic equipment. BACKGROUND

[0002] In electronic systems, different electronic devices have different power supply requirements. For example, some electronic devices commonly used in high-voltage and low-voltage power supply system, in which the high voltage is directly provided by the power supply, and the low voltage is obtained by step-down voltage of the power supply. For another example, some electronic devices need to convert the power supply voltage.

[0003] For electronic devices with different power supply requirements, a power supply circuit needs to be set to control the power supply voltage and output to the electronic device. Generally, the cost of the power supply circuit is relatively high, because high-value components such as delay circuits and transfer rails need to be set in the power supply circuit. Therefore, a power supply circuit with lower cost is needed to adjust the power supply signal. SUMMARY

[0004] Therefore, the utility model embodiment provides a power supply circuit and electronic equipment, so that the adjustment of the power supply signal can be realized according to the requirements of the load at a relatively low cost.

[0005] In the first aspect, the utility model embodiment provides a power supply circuit, which comprises:

[0006] The first control signal generation circuit is configured to generate a first control signal;

[0007] The second control signal generation circuit is connected with the first control signal generation circuit and is configured to generate a second control signal according to the first control signal;

[0008] The signal output circuit is configured to output a first power supply signal under the control of the second control signal.

[0009] In some embodiments, the power supply circuit further comprises:

[0010] The first signal input end is used for receiving a second power supply signal;

[0011] The second control signal generation circuit comprises:

[0012] The first resistor;

[0013] The first controlled switch is connected in series between the first signal input end and the ground end with the first resistor and is configured to be turned on or turned off under the control of the first control signal.

[0014] In some embodiments, the power supply circuit further comprises:

[0015] The first signal output end is connected with the first signal input end to output the second power supply signal.

[0016] The second signal output end is connected with the signal output circuit to output the first power supply signal.

[0017] In some embodiments, the first control signal generation circuit comprises:

[0018] The second resistor;

[0019] The third resistor is connected in series with the second resistor between the signal input end and the ground end;

[0020] The first control signal generation circuit is configured to output the first control signal through the common end of the second resistor and the third resistor.

[0021] In some embodiments, the signal output circuit comprises:

[0022] The fourth resistor;

[0023] The fifth resistor is connected in series with the fourth resistor between the signal input end and the ground end;

[0024] The second controlled switch is connected between the ground end and the common end of the fourth resistor and the fifth resistor, and is configured to be turned on or turned off under the control of the second control signal;

[0025] The voltage conversion module comprises an enable signal control end connected with the common end of the fourth resistor and the fifth resistor, and is configured to output the first power supply signal according to the enable signal control end.

[0026] In some embodiments, the second power supply signal output by the first signal input end gradually increases;

[0027] In response to the second power supply signal being less than or equal to a first predetermined value, the first controlled switch is turned off, the second control signal is equal to the second power supply signal, the second controlled switch is turned off, the signal of the enable signal control end of the voltage conversion module is less than a threshold value, and the voltage conversion module does not work.

[0028] In response to the second power supply signal being greater than the first predetermined value and less than or equal to a second predetermined value, the first controlled switch is turned off, the second control signal is equal to the second power supply signal, the second controlled switch is turned on, the signal of the enable signal control end of the voltage conversion module is zero, and the voltage conversion module does not work.

[0029] In response to the second power supply signal being greater than or equal to a second predetermined value, the first controlled switch is turned on, the second control signal is equal to zero, the second controlled switch is turned off, a signal of an enable signal control end of the voltage conversion module is greater than a threshold value, and the voltage conversion module works.

[0030] In some embodiments, the power supply circuit further includes:

[0031] a second signal input end;

[0032] a third signal input end;

[0033] The second signal input end is configured to receive a third power supply signal, and the third signal input end is configured to receive a first power supply signal.

[0034] The second control signal generation circuit includes:

[0035] a sixth resistor;

[0036] a third controlled switch connected in series with the sixth resistor between the second signal input end and a ground end and configured to be controlled by the first control signal to be turned on or turned off.

[0037] In some embodiments, the signal output circuit includes:

[0038] a seventh resistor;

[0039] a fourth controlled switch connected in series with the seventh resistor between the third signal input end and the ground end and configured to be controlled by the second control signal to be turned on or turned off.

[0040] In some embodiments, the power supply circuit further includes:

[0041] a third signal output end connected to a common end of the seventh resistor and the fourth controlled switch;

[0042] In response to the first control signal being less than a predetermined value, the third controlled switch is turned off, the fourth controlled switch is controlled by the second control signal to be turned on, and an output of the third signal output end is zero.

[0043] In response to the first control signal being greater than the predetermined value, the third controlled switch is turned on, the fourth controlled switch is controlled by the second control signal to be turned off, and the output of the third signal output end is the first power supply signal.

[0044] In a second aspect, the embodiments of the utility model provide an electronic device, the electronic device includes:

[0045] a power supply configured to provide a power supply signal to a signal input end;

[0046] at least one load;

[0047] at least one power supply circuit as claimed in the first aspect.

[0048] The technical scheme of the embodiment of the utility model discloses a first control signal generating circuit, a second control signal generating circuit and a signal output circuit are arranged in the power supply circuit, the first control signal is generated based on the first control signal generating circuit, the second control signal generating circuit is connected with the first control signal generating circuit, the second control signal is generated according to the first control signal, and the second control signal controls the signal output circuit to output the first power supply signal. Therefore, the adjustment of the power supply signal can be realized according to the demand of the load by a lower cost. BRIEF DESCRIPTION OF DRAWINGS

[0049] The above and other objects, features and advantages of the present utility model will become more apparent from the following description of the utility model embodiments referring to the accompanying drawings, in which:

[0050] Figure 1 It is the schematic diagram of electronic equipment of the embodiment of the utility model;

[0051] Figure 2 It is the schematic diagram of power supply circuit of the embodiment of the utility model;

[0052] Figure 3 It is the circuit diagram of power supply circuit of the first embodiment of the utility model;

[0053] Figure 4 It is the circuit diagram of power supply circuit of the second embodiment of the utility model. DETAILED DESCRIPTION

[0054] The present application is described below based on the embodiments, but the present application is not limited to these embodiments only. In the following detailed description of the present application, some specific details are described in detail. The present application can also be completely understood without the description of these details by those skilled in the art. In order to avoid confusion of the essence of the present application, the well-known methods, processes, procedures, elements and circuits are not described in detail.

[0055] In addition, those skilled in the art should understand that the drawings provided herein are for illustrative purposes only, and the drawings are not necessarily drawn to scale.

[0056] Meanwhile, it should be understood that in the following description, "circuitry" refers to an electrical circuit that is made up of at least one element or sub-circuitry and is electrically connected or electromagnetically connected. When an element or circuit is said to be "connected to" another element or said to be "connected between" two nodes, it can be directly coupled or connected to another element or there can be an intermediate element, and the connection between elements can be physical, logical, or a combination thereof. In contrast, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there is no intermediate element between the two.

[0057] Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

[0058] In the description of the present application, it should be understood that the terms "first", "second" and the like are only for descriptive purposes and should not be construed as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0059] Figure 1 is a schematic diagram of an electronic device according to an embodiment of the present application, as shown in Figure 1 The electronic device includes a power supply 1, a power supply circuit 2, and a load 3. The power supply 1 is connected to the power supply circuit 2, and the power supply 1 is configured to provide a power supply signal to the power supply circuit 2, specifically, to provide a power supply signal to the signal input end of the power supply circuit 2. The power supply circuit 2 is used to output a power supply signal according to the power supply signal provided by the power supply 1 for the load 3 to work.

[0060] The power supply 1 can be various forms of power supply modules, for example, the power supply 1 can be a rechargeable battery, a dry battery, etc. Power supply battery, but also for other forms of power supply signal (220V or 380V alternating city power) voltage conversion module.

[0061] The power supply circuit 2 is configured to receive the power supply signal provided by the power supply 1 and convert and / or directly provide the power supply signal to the load 3.

[0062] The load 3 can be various electrical devices, electrical modules or board cards in the electronic device, etc.

[0063] Specifically, the power supply circuit 2 supplies power to the load 3 according to the power supply signal provided by the power supply 1, wherein the power supply circuit 2 is configured according to the actual demand to output the power supply signal required by the load according to the power supply signal of the power supply. Therefore, by reasonably configuring the power supply circuit, the signal output to the load meets the demand of the load.

[0064] Figure 2is a schematic diagram of the power supply circuit of the embodiment of the utility model, as Figure 2 Indicated, the power supply circuit includes first control signal generating circuit 21, second control signal generating circuit 22, signal output circuit 23.

[0065] Specifically, first control signal generating circuit 21 is used to generate first control signal to control second control signal generating circuit 22.

[0066] Second control signal generating circuit 22 generates second control signal according to the first control signal, to control the output of signal output circuit 23.

[0067] Signal output circuit 23 outputs first power supply signal according to second control signal, wherein the first power supply signal is the power supply signal after voltage conversion in the voltage conversion module in the signal output circuit 23.

[0068] The utility model embodiment discloses a kind of power supply circuit and electronic equipment. By being provided with first control signal generating circuit, second control signal generating circuit and signal output circuit in power supply circuit, first control signal is generated based on first control signal generating circuit, second control signal generating circuit is connected with first control signal generating circuit, second control signal is generated according to first control signal, and the second control signal controls the signal output circuit output first power supply signal. Therefore, the adjustment of power supply signal can be realized according to the demand of load by relatively low cost.

[0069] In some electronic devices, two different voltages are needed to be used for power supply, and the power-on of the two voltages has timing requirements. If the timing requirements are not met, the electronic device may not work normally or even be damaged. Therefore, how to make the power-on timing of the circuit meet the predetermined requirements is a problem to be solved at present.

[0070] In the prior art, the control of power-on timing generally adopts the following methods: (1) a delay circuit is added to the enable pin of the step-down conversion module. This method may need to add RC delay circuits of different stages to different boards to achieve delay time, which is relatively complex to design. (2) a step-down converter module with a high threshold value of the enable pin is selected. This method increases the cost, and still needs to add an RC delay circuit to the enable pin most of the time, which is relatively high in circuit cost. (3) a transfer power supply rail is added between the 12V and 5V power supply systems. Similarly, this method additionally increases the transfer power supply module, thereby increasing the cost.

[0071] Therefore, it is necessary to design a circuit capable of controlling the power-on sequence of two different voltages at a relatively low cost.

[0072] Figure 3 is a circuit diagram of the power supply circuit of the first embodiment of the utility model, as shown in Figure 3 , the power supply circuit includes first control signal generating circuit 21, second control signal generating circuit 22, signal output circuit 23, first signal input end P1, first signal output end P2, second signal output end P3.

[0073] Among them, first signal input end P1 is connected with power supply, is configured as input second power supply signal V2, second power supply signal V2 is specifically the power supply signal provided by power supply.

[0074] First signal output end P2 is connected with first signal input end P1, is configured as receiving the second power supply signal V2 provided by the power supply, and provides second power supply signal V2 for load.

[0075] Second signal output end P3 is connected with signal output circuit 23, is configured as output first power supply signal V1.

[0076] First control signal generating circuit 21 includes second resistance R2 and third resistance R3, wherein second resistance R2 and third resistance R3 are connected in series between first signal input end P1 and ground end, wherein third resistance R3 is close to ground end, second resistance R2 is close to first signal input end P1, the common end of second resistance R2 and third resistance R3 is a1, and the first control signal V c1 is output through the common end a1.

[0077] Wherein, the first control signal V c1 Specifically, the voltage division of third resistance R3 in first control signal generating circuit 21, specifically calculated by the following formula:

[0078]

[0079] Specifically, since R2, R3 are fixed values in a certain circuit, the first control signal V c1 is directly proportional to second power supply signal V2.

[0080] Second control signal generating circuit 22 includes first resistance R1 and first controlled switch Q1, and the first resistance R1 and the first controlled switch Q1 are connected in series between the first signal input end P1 and the ground end, wherein one end of the first resistance R1 is connected with the first signal input end P1, the other end is connected with the first controlled switch Q1, and the first controlled switch Q1 is connected between the first resistance R1 and the ground end. Wherein, the first controlled switch Q1 is configured to be controlled by the first control signal V c1 Conduction or off.

[0081] In some embodiments, the first controlled switch Q1 is implemented by a NMOS (Negative channel-Metal-Oxide-Semiconductor), including a source, a gate and a drain. The source is connected to the ground, the gate is connected to a common terminal a1 of the second resistor R2 and the third resistor R3, and the drain is connected to the first resistor R1. Therefore, the voltage of the gate of the NMOS is the first control signal V c1 . Specifically, in response to the first control signal V c1 being less than a first turn-on voltage V h1 , the first controlled switch Q1 is turned off, and in response to the first control signal V c1 being greater than or equal to the first turn-on voltage V h1 , the first controlled switch Q1 is turned on. A common terminal a2 of the first resistor R1 and the first controlled switch Q1 is connected to the signal output circuit 23, and the second control signal V c2 is output through the common terminal a2. When the first controlled switch Q1 is turned off, the signal output circuit 23 is connected to the first signal input terminal P1, and the second control signal V c2 is the first power supply signal V1. When the first controlled switch Q1 is turned on, the signal output circuit 23 is connected to the ground, and the second control signal V c2 is zero.

[0082] It should be noted that the first controlled switch in the embodiments of the present application is taken as a NMOS for illustration, but the type of the first controlled switch is not limited in the embodiments of the present application, and a bipolar junction transistor (BJT) or an insulated gate bipolar transistor (IGBT) can also be applicable to the technical solution of the embodiments of the present application.

[0083] The signal output circuit 23 includes a fourth resistor R4, a fifth resistor R5, a second controlled switch Q2 and a voltage conversion module 231. The fourth resistor R4 and the fifth resistor R5 are connected between the first signal input terminal P1 and the ground, wherein the fourth resistor R4 is close to the first signal input terminal P1, and the fifth resistor R5 is close to the ground.

[0084] In some embodiments, the second controlled switch Q2 is implemented by a NPN triode, including a base, a collector and an emitter. The collector is connected to a common terminal a3 of the fourth resistor R4 and the fifth resistor R5, the base is connected to the common terminal a2 of the first resistor R1 and the first controlled switch Q1, and the emitter is connected to the ground. In response to the voltage of the base being less than a second turn-on voltage V f2, the second controlled switch Q2 is off; in response to the voltage of the base being greater than or equal to the second turn-on voltage V f2 , the second controlled switch Q2 is on. The voltage conversion module 231 comprises an input port, an output port and an enable signal control terminal, the input port is connected to the first signal input end P1, the output port is connected to the second signal output end P3, and the enable signal control terminal is connected to the common end a3 of the fourth resistor R4 and the fifth resistor R5, so that the signal of the enable signal control terminal is equal to the voltage of the common end a3, and the value is specifically V ce . Specifically, the voltage conversion module 231 is configured to output the first power supply signal V1, specifically, when the signal V ce of the enable signal control terminal is less than the third turn-on voltage V f3 , the voltage conversion module 231 does not work, and when the signal V ce of the enable signal control terminal is greater than or equal to the third turn-on voltage V f3 , the voltage conversion module 231 outputs the first power supply signal V1 according to the second power supply signal V2.

[0085] Specifically, when the second controlled switch Q2 is on, the enable signal control terminal of the voltage conversion module 231 is connected to the ground end, the signal V ce of the enable signal control terminal of the voltage conversion module 231 is 0, and the voltage conversion module 231 does not work, and when the second controlled switch Q2 is off, the enable signal control terminal of the voltage conversion module 231 is connected to the common end a3 of the fourth resistor R4 and the fifth resistor R5, and the signal V ce of the enable signal control terminal is specifically the voltage division of the fifth resistor R5 in the voltage division circuit composed of the fourth resistor R4 and the fifth resistor R5, and is specifically calculated by the following formula:

[0086]

[0087] Wherein, V ce is the signal of the enable signal control terminal. Since R4 and R5 are fixed values in a certain circuit, the signal of the enable signal control terminal is in a proportional relationship with the second power supply signal V2.

[0088] In some embodiments, the second power supply signal V2 gradually rises and finally approaches stability.

[0089] Specifically, the embodiment of the utility model divides the change of the second power supply signal V2 into three stages by setting the first predetermined value V f1 and the second predetermined value V f2 . Wherein, the first predetermined value V f1 and the second predetermined value V f2 are between 0 and the stable voltage value of the second power supply signal V2, and the first predetermined value Vf1 less than the second predetermined value V f2 . That is, 0 < V f1 < V f2 < V m wherein V m is a stable voltage value of the second supply signal V2. Wherein the first predetermined value V f1 is set according to the second on-voltage V h2 of the second controlled switch Q2. Specifically, the first predetermined value V f1 is equal to the second on-voltage V h2 . The second predetermined value V f2 is set according to the first on-voltage V h1 of the first controlled switch Q1 and the first control signal generating circuit 21. Specifically, the relationship is V f2 * R3 / (R2 + R3) = V h1 , wherein R2 and R3 are the resistance values of the second resistor R2 and the third resistor R3 respectively.

[0090] In the first stage, during the gradual increase of the second supply signal V2, when the second supply signal V2 is less than the first predetermined value, at this time, the first control signal V c1 output by the first control signal generating circuit 21 is less than the first on-voltage V h1 , the first controlled switch Q1 is off, the second control signal V c2 generated by the second control signal generating circuit 22 is equal to the second supply signal V2, at this time, the second control signal V c2 is less than the second on-voltage V h2 , the second controlled switch Q2 is off, the signal of the enable signal control end of the voltage conversion module 231 is equal to the second supply signal V2, which is less than the third on-voltage V h3 , at this time, the voltage conversion module 231 does not work.

[0091] In the second stage, when the second supply signal V2 increases to be greater than or equal to the first predetermined value V f1 and less than the second predetermined value V f2 , the first control signal V c1 does not reach the first on-voltage V h1 , the first controlled switch Q1 is off, so that the second control signal is equal to the second supply signal, at this time, the second supply signal is greater than the second on-voltage V h2 of the second controlled switch Q2, the second controlled switch Q2 is on, so that the enable signal control end of the voltage conversion module 231 is grounded through the second controlled switch, the signal of the enable signal control end of the voltage conversion module 231 is zero, and the voltage conversion module 231 does not work.

[0092] In the third stage, the second supply signal V2 rises to be greater than or equal to the second predetermined value, and finally reaches the stable voltage value V of the second supply signal V2 m . When the second supply signal V3 rises to be equal to the second predetermined value V f2 , because the second predetermined value satisfies V f2 *R3 / (R2+R3)=V h1 , therefore, the first control signal V c1 at this time is equal to the first turn-on voltage V h1 , the first controlled switch Q1 is turned on, so that the base of the second controlled switch Q2 is connected to the ground terminal, at this time the second control signal V c2 is zero, therefore the second controlled switch Q2 is turned off, the signal of the enable signal control terminal of the voltage conversion module is the voltage division of the fourth resistance R4 and the fifth resistance R5 in the series circuit, which is greater than the third turn-on voltage V h3 , the voltage conversion module 231 starts to work. When the second supply signal V2 continues to rise until V m is reached, the first control signal V c1 output by the first control signal generation circuit 21 exceeds the first turn-on voltage V h1 , the first controlled switch Q1 is turned on, at this time the second control signal V c2 generated by the second control signal generation circuit 22 is equal to zero, the second controlled switch Q2 is turned off, the signal of the enable signal control terminal of the voltage conversion module 231 is greater than the third turn-on voltage V h3 , the voltage conversion module 231 continues to work.

[0093] The following will be described in more detail by taking a specific example. In a specific implementation, the second supply signal V2 starts from zero and gradually rises to V m , where V m =12V. The first turn-on voltage V h1 =2V, the second turn-on voltage V h2 =0.65V, the third turn-on voltage V h3 of the enable signal control terminal of the voltage conversion module 231 =1.5V, the second resistance R2=9.5kΩ, the third resistance R3=2kΩ, the fourth resistance R4=10kΩ, and the fifth resistance R5=2kΩ. Through calculation, the first predetermined value V f1 =0.65V, and the second predetermined value V f2 =11.5V.

[0094] Specifically, when the second supply signal V2 is less than the first predetermined value V f1(0.65V), i.e. during the process that the second power supply signal V2 rises from zero to 0.65V, at this time, the first control signal V c1 generated by the first control signal generation circuit 21 is proportional to the second power supply signal V2, and when the second power supply signal V2 is 0.65V, the first control signal V c1 is 0.11V, which is less than 2V, i.e. less than the first turn-on voltage V h1 , the first controlled switch Q1 is off. At this time, the second control signal V c2 is equal to the second power supply signal V2, which is obviously less than the second turn-on voltage V h2 , the second controlled switch Q2 is off, and the signal V ce at the enable signal control end of the voltage conversion module 231 is the voltage division of the fifth resistor R5 in the series circuit composed of the fourth resistor R4 and the fifth resistor R5, which is obviously also less than 2V, thus less than the third turn-on voltage V h3 , at this time, the voltage conversion module 231 does not work.

[0095] When the second power supply signal V2 is greater than or equal to the first predetermined value V f1 (0.65V) and less than the second predetermined value V f2 (11.5V), i.e. during the process that the second power supply signal V2 rises from 0.65V to 11.5V, when the second power supply signal V2 is equal to the first predetermined value 0.65V, the first control signal V c1 is 0.11V, which is less than 2V, the first controlled switch Q1 is off, and the second control signal V c2 at this time is equal to the second power supply signal V2, i.e. equal to 0.65V, the second controlled switch Q2 is on, at this time, the signal V ce at the enable signal control end of the voltage conversion module 231 is zero, which is obviously less than the third turn-on voltage V h3 , the voltage conversion module 231 does not work. When the second power supply signal V2 continues to rise but is less than the second predetermined value 11.5V, since the first control signal V c1 is proportional to the second power supply signal V2, and when V2=11.5V, V c1 =2V, therefore during the rising process of the second power supply signal V2, the first control signal V c1 is always less than 2V, the first controlled switch Q1 is off, at this time, the second control signal V c2 is equal to the second power supply signal V2, which is obviously greater than 0.65V, i.e. greater than the second turn-on voltage V h1 , the second controlled switch Q2 is on. At this time, the signal V ce at the enable signal control end of the voltage conversion module 231 is still zero, which is less than the third turn-on voltage V h3 , the voltage conversion module 231 remains not working.

[0096] When the second supply signal V2 is greater than or equal to the second predetermined value V f2 (11.5V), i.e. the second supply signal V2 gradually rises from the second predetermined value V f2 (11.5V) to 12V, when the second supply signal V2 = 11.5V, the first control signal V c1 is equal to 2V, at this time the first controlled switch Q1 is turned on, at this time, the second control signal V c2 is equal to zero, the second controlled switch Q2 is turned off, the signal V ce at the enable signal control end of the voltage conversion module 231 is equal to 1.91V, i.e. greater than the third turn-on voltage 1.5V, the voltage conversion module 231 works, the second signal output end P3 outputs the first supply signal V1, and the first signal output end P2 outputs the second supply signal V2, thereby realizing the output of two different voltages. When the second supply signal V2 continues to rise from 11.5V, the first control signal V c1 starts to gradually increase from 2V, the first controlled switch Q1 remains turned on, the second control signal V c2 is equal to zero, the second controlled switch Q2 remains turned off, the signal V ce at the enable signal control end of the voltage conversion module 231 starts to gradually increase from 1.91V, at this time the voltage conversion module 231 continues to work normally and continues to output the first supply signal V1 and the second supply signal V2.

[0097] In general, in this embodiment, the power supply circuit provides the first supply signal V1 and the second supply signal V2 to the load according to the second supply signal V2, wherein the first supply signal V1 is the voltage after voltage conversion by the voltage conversion module 231 in the power supply circuit, and the voltage value of the second supply signal V2 is greater than that of the first supply signal V1. When the voltage provided by the power supply gradually rises, by setting the power supply circuit 2 to control the second supply signal V2, the voltage converted by the voltage conversion module 231 is turned on again when the power supply voltage rises to a stable value, at this time the power supply circuit starts to provide the first supply signal through the second signal output end, so that the provision of the first supply signal V1 is provided after the second supply signal V2 rises to a stable value, i.e. the provision of the first supply signal V1 and the second supply signal V2. By this means, the protection of the load is realized.

[0098] The embodiment of the utility model discloses a first control signal generating circuit, second control signal generating circuit and signal output circuit are arranged in the power supply circuit, and the first control signal is generated based on the first control signal generating circuit, the second control signal generating circuit is connected with the first control signal generating circuit, and the second control signal is generated according to the first control signal, and the second control signal controls the signal output circuit to output the first power supply signal. Therefore, the adjustment of the power supply signal can be realized according to the demand of the load by the lower cost.

[0099] In some electronic devices, power supply needs to be provided by level conversion, and level conversion is usually used in digital circuits and embedded systems, for example, converting logic levels of different voltage values. Specifically, by controlling the high level or low level of the signal, the high level or low level is output accordingly.

[0100] Figure 4 It is the circuit diagram of the power supply circuit of the second embodiment of the utility model, as shown in Figure 4 The power supply circuit includes a first control signal generating circuit 21, a second control signal generating circuit 22, a signal output circuit 23, a second signal input terminal P4, a third signal input terminal P5 and a third signal output terminal P6.

[0101] The first control signal generating circuit 21 is used for generating a first control signal V c1 to control the second control signal generating circuit 22, and the second control signal generating circuit 22 generates a second control signal V c1 according to the first control signal V c2 to control the output of the signal output circuit 23. The signal output circuit 23 outputs a first power supply signal V1 according to the second control signal V c2 .

[0102] It should be noted that in the embodiment of the utility model, the first control signal generating circuit 21 can be similar to the voltage dividing circuit in the first embodiment, or can be other forms of circuits or devices capable of providing the first control signal, for example, a voltage signal generator, a voltage output interface, and the embodiment of the utility model does not make any limitation.

[0103] The second control signal generating circuit 22 includes a sixth resistor R6 and a third controlled switch Q3, and the third controlled switch Q3 and the sixth resistor R6 are connected in series between the second signal input terminal P4 and the ground terminal. The third controlled switch Q3 is configured to be controlled by the first control signal V c1 to be turned on or turned off. The third controlled switch Q3 is close to the ground terminal, and the sixth resistor R6 is close to the second signal input terminal P4. The common end a4 of the third controlled switch Q3 and the sixth resistor outputs the second control signal V c2 .

[0104] In some embodiments, the third controlled switch Q3 is implemented by a NMOS transistor, the source is connected to the ground, the gate is connected to the first control signal generating circuit 21, and the drain is connected to the sixth resistor R6. The third controlled switch Q3 is configured to be turned on in response to the voltage at the gate being greater than or equal to a fourth turn-on voltage V f4 , and turned off in response to the voltage at the gate being less than the fourth turn-on voltage V f4 .

[0105] The signal output circuit 23 includes a fourth controlled switch Q4 and a seventh resistor R7. The fourth controlled switch Q4 and the seventh resistor R7 are connected between the ground and the third signal input terminal P5. The seventh resistor R7 is close to the third signal output terminal P6, and the fourth controlled switch Q4 is close to the ground. The fourth controlled switch Q4 is configured to be turned on or turned off under the control of a second control signal V c2 . In this embodiment, the fourth turn-on voltage V f4 of the fourth controlled switch Q4 is less than the third supply signal V3.

[0106] In some embodiments, the fourth controlled switch Q4 is implemented by a transistor. In this embodiment, the collector is connected to the seventh resistor R7, the base is connected to the common terminal a4 of the sixth resistor R6 and the third controlled switch Q3, and the emitter is connected to the ground. The fourth controlled switch Q4 is configured to be turned on in response to the voltage at the base being greater than or equal to a fifth turn-on voltage V f5 , and turned off in response to the voltage at the base being less than the fifth turn-on voltage V f5 .

[0107] The second signal input terminal P4 is connected to a power supply and configured to provide the third supply signal V3 according to the power supply. The third signal input terminal P5 is connected to a power supply and configured to provide the first supply signal V1 according to the power supply. The third signal output terminal P6 is connected to the common terminal a5 of the seventh resistor R7 and the fourth controlled switch Q4, and used to output the first supply signal V1. Therefore, the voltage output by the third signal output terminal P6 is equal to the voltage at the common terminal a5.

[0108] Specifically, when the first control signal V c1 is at a low level, i.e., the first control signal V c1 is less than the fourth turn-on voltage V h4 of the third controlled switch Q3, the third controlled switch Q3 is turned off. At this time, the second control signal V c2 is equal to the third supply signal V3, and thus the second control signal V c2 is greater than the fifth turn-on voltage V h5When the first control signal V

[0109] When the first control signal V c1 is high, i.e., the first control signal V c1 is greater than or equal to the fourth turn-on voltage V h4 of the third controlled switch Q3, the third controlled switch Q3 is turned on, at this time, the second control signal V c2 is equal to zero, the fourth controlled switch Q4 is controlled by the second control signal V c2 and is turned off, the third signal output terminal P6 is connected to the third signal input terminal P5, thus the third signal output terminal P6 outputs high, the output voltage is equal to the voltage of the common terminal a5, and the value is specifically the first power supply signal V1.

[0110] The embodiment generates the first control signal by the first control signal generation circuit, and the third signal output terminal outputs high or low accordingly, thereby realizing the conversion between high and low levels.

[0111] The embodiment sets the first control signal generation circuit, the second control signal generation circuit and the signal output circuit in the power supply circuit, generates the first control signal based on the first control signal generation circuit, connects the second control signal generation circuit with the first control signal generation circuit, generates the second control signal according to the first control signal, and controls the signal output circuit to output the first power supply signal by the second control signal. Thus, the adjustment of the power supply signal can be realized according to the demand of the load at a lower cost.

[0112] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. 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 power supply circuit comprises: a first control signal generation circuit configured to generate a first control signal; a second control signal generation circuit connected with the first control signal generation circuit and configured to generate a second control signal according to the first control signal; a signal output circuit configured to output a first power supply signal under the control of the second control signal.

2. The power supply circuit of claim 1, wherein, The power supply circuit further comprises: a first signal input end for receiving a second power supply signal; The second control signal generation circuit comprises: a first resistor; a first controlled switch connected in series with the first resistor between the first signal input end and a ground end and configured to be turned on or turned off under the control of the first control signal.

3. The power supply circuit of claim 2, wherein, The power supply circuit further comprises: a first signal output end connected with the first signal input end to output the second power supply signal; a second signal output end connected with the signal output circuit to output the first power supply signal.

4. The power supply circuit of claim 3, wherein, The first control signal generation circuit comprises: a second resistor; a third resistor connected in series with the second resistor between the first signal input end and the ground end; The first control signal generation circuit is configured to output the first control signal through a common end of the second resistor and the third resistor.

5. The power supply circuit of claim 4, wherein, The signal output circuit comprises: a fourth resistor; a fifth resistor connected in series with the fourth resistor between the first signal input end and the ground end; a second controlled switch connected between the ground end and a common end of the fourth resistor and the fifth resistor and configured to be turned on or turned off under the control of the second control signal; a voltage conversion module comprising an enable signal control end connected with the common end of the fourth resistor and the fifth resistor and configured to output the first power supply signal according to the enable signal control end.

6. The power supply circuit of claim 5, wherein, The second power supply signal output by the first signal input end gradually increases; In response to the second power supply signal being less than or equal to a first predetermined value, the first controlled switch is turned off, the second control signal is equal to the second power supply signal, the second controlled switch is turned off, the signal of the enable signal control end of the voltage conversion module is less than a threshold value, and the voltage conversion module does not work; In response to the second power supply signal being greater than the first predetermined value and less than or equal to a second predetermined value, the first controlled switch is turned off, the second control signal is equal to the second power supply signal, the second controlled switch is turned on, the signal of the enable signal control end of the voltage conversion module is zero, and the voltage conversion module does not work; In response to the second power supply signal being greater than or equal to the second predetermined value, the first controlled switch is turned on, the second control signal is equal to zero, the second controlled switch is turned off, the signal of the enable signal control end of the voltage conversion module is greater than the threshold value, and the voltage conversion module works.

7. The power supply circuit of claim 1, wherein, The power supply circuit further comprises: a second signal input end; a third signal input end; The second signal input end is configured to receive a third power supply signal, and the third signal input end is configured to receive the first power supply signal; The second control signal generation circuit comprises: a sixth resistor; A third controlled switch is connected in series with the sixth resistor between the second signal input terminal and a ground terminal and is configured to be turned on or turned off under control of the first control signal.

8. The power supply circuit of claim 7, wherein, The signal output circuit comprises: A seventh resistor; A fourth controlled switch is connected in series with the seventh resistor between the third signal input terminal and a ground terminal and is configured to be turned on or turned off under control of the second control signal.

9. The power supply circuit of claim 8, wherein, The power supply circuit further comprises: A third signal output terminal connected to a common terminal of the seventh resistor and the fourth controlled switch; wherein, in response to the first control signal being less than a predetermined value, the third controlled switch is turned off, the fourth controlled switch is turned on under control of the second control signal, and the output of the third signal output terminal is zero; in response to the first control signal being greater than the predetermined value, the third controlled switch is turned on, the fourth controlled switch is turned off under control of the second control signal, and the output of the third signal output terminal is the first power supply signal.

10. An electronic device, comprising: The electronic device comprises: a power supply configured to provide a power supply signal to a signal input terminal; at least one load; at least one power supply circuit as claimed in any one of claims 1-9.

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