Power circuits and electrical equipment

Abstract

The utility model proposes a power supply circuit and electrical equipment, the power supply circuit includes: a control chip, the control chip includes an input end, an output end and a feedback end; a voltage divider circuit, the first end of the voltage divider circuit is connected to the output end, the second end of the voltage divider circuit is connected to the feedback end, and the third end of the voltage divider circuit is grounded; wherein the first end of the voltage divider circuit and the third end of the voltage divider circuit are used to connect to a load; a resistance adjustment circuit, the first end of the resistance adjustment circuit is connected to the second end of the voltage divider circuit, the second end of the resistance adjustment circuit is connected to a resistance adjustment signal, and the third end of the resistance adjustment circuit is grounded; wherein the resistance adjustment circuit is used to adjust the resistance of the voltage divider circuit to adjust the voltage value output by the first end of the voltage divider circuit. The power supply circuit provided by the utility model can adjust the output voltage of the power supply circuit, thereby improving the flexibility of the use of the power supply circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a power supply circuit and electrical equipment. Background Art

[0002] In the related art, the voltage of the power supply is converted by a control chip in the power supply circuit, and the converted voltage value is adjusted by a voltage divider circuit to be suitable for different electrical devices. However, after the output voltage of the power supply circuit in the related art is set, it cannot be adjusted during use, resulting in high limitations in the use of the power supply circuit. Utility Model Content

[0003] The utility model aims at least to solve the technical problem in the prior art that the output voltage of the power supply circuit cannot be adjusted during use after being set.

[0004] To this end, a first aspect of the utility model provides a power supply circuit.

[0005] A second aspect of the utility model provides an electrical device.

[0006] The first aspect of the utility model provides a power supply circuit, comprising: a control chip, the control chip comprising an input terminal, an output terminal and a feedback terminal; a voltage divider circuit, the first terminal of the voltage divider circuit is connected to the output terminal, the second terminal of the voltage divider circuit is connected to the feedback terminal, and the third terminal of the voltage divider circuit is grounded; wherein the first terminal of the voltage divider circuit and the third terminal of the voltage divider circuit are used to be connected to a load; a resistance adjustment circuit, the first terminal of the resistance adjustment circuit is connected to the second terminal of the voltage divider circuit, the second terminal of the resistance adjustment circuit is connected to a resistance adjustment signal, and the third terminal of the resistance adjustment circuit is grounded; wherein the resistance adjustment circuit is used to adjust the resistance of the voltage divider circuit to adjust the voltage value output by the first terminal of the voltage divider circuit.

[0007] The power supply circuit provided by the utility model can be used to convert the voltage provided by the power supply into the DC voltage required by the electrical equipment, thereby ensuring that the electrical equipment can operate normally.

[0008] Specifically, the power supply circuit includes a control chip, and the control chip includes an input terminal and an output terminal, wherein the input terminal is used to connect to a power supply and convert the current output by the power supply so as to output the current through the output terminal.

[0009] The control chip also includes a voltage divider circuit, the first end of the voltage divider circuit is connected to the output end, and the second end of the voltage divider circuit is connected to the feedback end. During the operation of the power supply circuit, the current output by the control chip is divided by the voltage divider circuit, so as to set the voltage output by the control chip. At the same time, the second end of the voltage divider circuit is connected to the feedback end of the control chip, so that the control chip can receive the feedback signal of the voltage divider circuit to determine whether the current output voltage is at a preset voltage value. Furthermore, the first end of the voltage divider circuit and the third end of the voltage divider circuit are connected to the load to power the load, and the third end of the voltage divider circuit is grounded so that the voltage value received by the load is equal to the voltage value after the voltage divider circuit is divided.

[0010] Furthermore, the power supply circuit also includes a resistance adjustment circuit, a first end of the resistance adjustment circuit is connected to the second end of the voltage divider circuit, the second end of the resistance adjustment circuit is connected to the resistance adjustment signal, and the third end of the resistance adjustment circuit is grounded. By setting the resistance adjustment circuit, the resistance value of the voltage divider circuit can be adjusted according to the resistance adjustment signal input by the second end of the resistance adjustment circuit, thereby adjusting the voltage value output by the first end of the voltage divider resistor.

[0011] Specifically, the first end of the voltage divider circuit is connected to the output end of the control chip, and the third end of the voltage divider circuit is grounded. Since the current output by the output end of the control chip remains unchanged, when the resistance of the voltage divider circuit changes, the voltage output by the first end of the voltage divider resistor will change, thereby realizing the adjustment of the output voltage of the power supply circuit. That is, the resistance adjustment signal is received by the second end of the resistance adjustment circuit, so that when the resistance adjustment signal is received, the resistance adjustment circuit can adjust the resistance of the voltage divider circuit, thereby realizing the adjustment of the voltage output by the first end of the voltage divider circuit, that is, realizing the real-time adjustment of the output voltage of the power supply circuit according to the resistance adjustment signal.

[0012] The power supply circuit provided by the utility model can process the current output by the power supply through the control chip by connecting the input end of the control chip to the power supply, so as to output the DC current required by the electrical equipment through the output end of the control chip, and further divide the current output by the output end of the control chip through the voltage divider circuit, so as to set the voltage of the DC power output by the control chip. At the same time, by setting the resistance adjustment circuit, it is possible to adjust the resistance value of the voltage divider circuit according to the resistance adjustment signal input by the second end of the resistance adjustment circuit, and then adjust the voltage value output by the first end of the voltage divider resistor, that is, to achieve real-time adjustment of the output voltage of the power supply circuit. Therefore, the power supply circuit can output the corresponding voltage according to the different needs of the connected electrical equipment, thereby improving the flexibility of the use of the power supply circuit.

[0013] In addition, the power supply circuit in the above technical solution provided by the utility model may also have the following additional technical features:

[0014] In some technical schemes, optionally, the resistance adjustment circuit includes: a first resistor, one end of the first resistor is connected to the second end of the voltage divider circuit; a switch element, a first end of the switch element is connected to the second end of the first resistor, the other end of the switch element is grounded, and a control end of the switch element is connected to a resistance adjustment signal; wherein the resistance adjustment signal is used to control the conduction and disconnection between the first end of the switch element and the second end of the switch element, and when the first end of the switch element and the second end of the switch element are conductive, the first resistor is connected in parallel with at least a part of the voltage divider circuit.

[0015] In this technical solution, the resistance adjustment circuit may include a first resistor and a switch, wherein one end of the first resistor is connected to the second end of the voltage divider circuit, and at the same time, the other end of the first resistor is grounded through the switch. That is, when the switch is turned on, one end of the first resistor is connected to the second end of the voltage divider circuit, and the other end of the first resistor is grounded. At this time, the first resistor is connected in parallel with at least a portion of the voltage divider circuit. It can be understood that the third end of the voltage divider circuit is grounded, and the first resistor is connected between the second end of the voltage divider circuit and the ground, so that at least a portion of the voltage divider circuit can be connected in parallel with the first resistor, so that the resistance value of the voltage divider circuit can be changed, and then the voltage output by the first end of the voltage divider resistor is changed, that is, the voltage output by the voltage divider resistor is adjusted.

[0016] Furthermore, the control end of the switch element is connected to the resistance adjustment signal, so that the on and off states of the switch element can be adjusted by the resistance adjustment signal. For example, when the resistance adjustment signal outputs a high level, the switch element is in an on state, at which time the first resistor is grounded, and at the same time the first resistor is connected to the second end of the voltage divider circuit, so that the first resistor is connected in parallel with a part of the voltage divider circuit to adjust the voltage output by the voltage divider circuit. When the resistance adjustment signal outputs a low level, the switch element is turned off, at which time the first resistor is not connected in parallel with a part of the voltage divider circuit, and the voltage divider circuit maintains the original output voltage.

[0017] In some technical solutions, optionally, the switch element includes: a transistor, a source of the transistor is connected to the second end of the first resistor, a drain of the transistor is grounded, and a gate of the transistor is connected to the resistance adjustment signal.

[0018] In this technical solution, the switch element may include a transistor, the source of the transistor is connected to the second end of the first resistor, the drain of the transistor is grounded, and the gate of the transistor is connected to the resistance adjustment signal. The resistance adjustment signal can change the voltage of the gate of the transistor, thereby controlling the formation of a conductive channel in the channel between the source and the drain of the transistor to achieve the conduction and shutdown of the transistor. In addition, the first resistor is connected in parallel to a part of the voltage divider circuit.

[0019] In some technical solutions, optionally, the resistance adjustment circuit further includes: a diode, wherein the anode of the diode is connected to the drain of the transistor, and the cathode of the diode is connected to the gate of the transistor.

[0020] In this technical solution, a diode may be connected between the drain of the transistor and the gate of the transistor. Specifically, the positive electrode of the diode is connected to the drain of the transistor, and the negative electrode of the diode is connected to the gate of the transistor. By providing a diode, the voltage between the drain of the transistor and the gate of the transistor can be guaranteed, and other interference signals during the operation of the power supply circuit can be prevented from affecting the voltage between the drain of the transistor and the gate of the transistor, thereby ensuring that the gate of the diode can accurately receive the resistance adjustment signal, thereby ensuring that the resistance adjustment circuit can operate stably.

[0021] Specifically, the diode may include a voltage stabilizing diode, which can not only ensure the voltage between the drain of the transistor and the gate of the transistor, but also achieve an overvoltage protection function to protect the transistor from burning out under a large current condition.

[0022] In some technical schemes, optionally, the voltage divider circuit includes: a second resistor, one end of the second resistor is connected to the output terminal, and the other end of the second resistor is connected to the feedback terminal; a third resistor, one end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is grounded; wherein, when the switch is turned on, the third resistor is connected in parallel with the first resistor.

[0023] In this technical solution, the voltage divider circuit includes a second resistor and a third resistor, wherein one end of the second resistor is connected to the output end of the control chip, and the other end of the second resistor is connected to the feedback end of the control chip. One end of the third resistor is connected to the other end of the second resistor, and the other end of the third resistor is grounded. By setting the resistance values ​​of the second resistor and the third resistor, the voltage value output by the voltage divider circuit can be set.

[0024] Further, in the resistance adjustment circuit, one end of the first resistor is connected to the second end of the voltage divider circuit, that is, one end of the first resistor is connected to the other end of the second resistor. When the switch is turned on, the other end of the first resistor is grounded, that is, one end of the first resistor is connected to the other end of the second resistor, and the other end of the first resistor is grounded. At this time, one end of the third resistor is also connected to the other end of the second resistor, and the other end of the third resistor is also grounded, that is, when the switch is turned on, the first resistor and the third resistor are in a parallel connection state, thereby changing the resistance value of the voltage divider circuit, thereby adjusting the voltage value output by the voltage divider circuit.

[0025] In some technical solutions, optionally, the resistance adjustment circuit includes: a digital potentiometer, one end of the digital potentiometer is connected to the feedback end, and the other end of the digital potentiometer is grounded.

[0026] In this technical solution, the resistance adjustment circuit can also use a digital potentiometer, that is, one end of the digital potentiometer is connected to the feedback end of the control chip, and the other end of the digital potentiometer is grounded. By connecting the digital potentiometer to the resistance adjustment signal, the operating parameters of the digital potentiometer are adjusted according to the resistance adjustment signal, and then the resistance of the digital potentiometer is connected in parallel to at least a part of the voltage divider circuit to adjust the resistance of the voltage divider circuit, and then adjust the voltage value output by the voltage divider circuit.

[0027] It can be understood that the digital potentiometer is a new type of complementary metal oxide semiconductor that replaces the traditional mechanical potentiometer (analog potentiometer). It is an integrated circuit used for processing digital and analog mixed signals and can be used as a variable resistor to adjust the resistance of a voltage divider circuit.

[0028] In some technical solutions, optionally, the power supply circuit further includes a reverse protection module, one end of the reverse protection module is connected to the first end of the voltage divider circuit, and the other end of the reverse protection module is used to be connected to the load.

[0029] In this technical solution, the power supply circuit may further include a reverse protection module, which is arranged between the first end of the voltage divider circuit and the load, thereby realizing reverse protection of the current between the voltage divider circuit and the load, and preventing the reverse flow of current from damaging the electrical components in the power supply circuit.

[0030] In some technical solutions, optionally, the power supply circuit also includes an overcurrent protection module, one end of the overcurrent protection module is connected to one end of the voltage divider circuit, and the other end of the overcurrent protection module is used to connect to the load.

[0031] In this technical solution, an overcurrent protection module can also be provided between the second end of the voltage divider circuit and the load, that is, one end of the overcurrent protection module is connected to the second end of the voltage divider circuit, and the other end of the overcurrent protection module is connected to the load. By providing the overcurrent protection module, overcurrent protection can be implemented for the current between the voltage divider circuit and the load, thereby preventing the current between the voltage divider circuit and the load from being too large to protect the power supply circuit and the load.

[0032] Specifically, the overcurrent protection module and the reverse protection module can be connected in series between the voltage divider circuit and the load, thereby achieving reverse protection and overcurrent protection between the voltage divider circuit and the load at the same time.

[0033] In some technical solutions, optionally, the power supply circuit further includes a filter circuit, one end of the filter circuit is connected to the output end, and the other end of the filter circuit is connected to the third end of the voltage divider circuit.

[0034] In this technical solution, a filter circuit can be provided between the output end of the control chip and the third end of the voltage divider circuit. By providing the filter circuit, the current output by the control chip can be filtered, thereby ensuring the stability of the current output by the control chip, that is, ensuring the stability of the current output by the power supply circuit, and ensuring that the power supply circuit outputs a stable current to the load.

[0035] In some technical schemes, optionally, the filtering circuit includes: a first inductor, one end of the first inductor is connected to the output end, and the other end of the first inductor is connected to the first end of the voltage divider circuit; a first capacitor, one end of the first capacitor is connected to the first end of the voltage divider circuit, and the other end of the first capacitor is connected to the third end of the voltage divider circuit.

[0036] In this technical solution, the filter circuit may include a first inductor and a first capacitor, wherein one end of the first inductor is connected to the output end of the control chip, and the other end of the first inductor is connected to the first end of the voltage divider circuit. One end of the first capacitor is connected to the first end of the voltage divider circuit, and the other end of the first capacitor is connected to the third end of the voltage divider circuit. By setting the first inductor and the first capacitor, the current output by the output end of the control chip can be filtered, thereby ensuring the stability of the current output by the control chip. That is, the stability of the current output by the power supply circuit is ensured, and the power supply circuit is guaranteed to output a stable current to the load.

[0037] In some technical solutions, optionally, the control chip also includes an enable signal input terminal, and the control chip is used to output a voltage according to a received enable signal.

[0038] In this technical solution, the control chip may further include an enable signal input terminal, through which an enable signal may be received, so that the power supply voltage received by the input terminal may be converted according to the received enable signal, and then the DC current required by the electrical equipment may be output through the output terminal.

[0039] A second aspect of the utility model provides an electrical device, comprising a power supply circuit as described in any one of the above technical solutions.

[0040] The electrical device provided by the utility model comprises the power supply circuit of any one of the above technical solutions, and therefore, the electrical device has all the beneficial effects of the above power supply circuit, which will not be described in detail here.

[0041] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0043] Figure 1 A circuit diagram of a power supply circuit provided by an embodiment of the utility model is shown;

[0044] Figure 2 The structure block diagram of the electrical equipment provided by the embodiment of the utility model is shown.

[0045] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and the component names is as follows:

[0046] 100 power supply circuit, 102 control chip, 104 input terminal, 106 output terminal, 108 feedback terminal, 110 voltage divider circuit, 112 resistance adjustment circuit, 114 first resistor, 116 switch element, 118 diode, 120 second resistor, 122 third resistor, 124 reverse protection module, 126 overcurrent protection module, 128 filter circuit, 130 first inductor, 132 first capacitor, 134 enable signal input terminal, 136 load, 200 electrical equipment. DETAILED DESCRIPTION

[0047] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0049] Refer to the following Figure 1 and Figure 2 To describe the power supply circuit and electrical equipment provided according to some embodiments of the present utility model.

[0050] The utility model provides a power supply circuit 100, such as Figure 1 As shown, the power supply circuit 100 includes: a control chip 102, the control chip 102 includes an input terminal 104, an output terminal 106 and a feedback terminal 108; a voltage divider circuit 110, a first terminal of the voltage divider circuit 110 is connected to the output terminal 106, a second terminal of the voltage divider circuit 110 is connected to the feedback terminal 108, and a third terminal of the voltage divider circuit 110 is grounded; wherein, the first terminal of the voltage divider circuit 110 and the third terminal of the voltage divider circuit 110 are used to be connected to a load 136; a resistance adjustment circuit 112, a first terminal of the resistance adjustment circuit 112 is connected to the second terminal of the voltage divider circuit 110, a second terminal of the resistance adjustment circuit 112 is connected to a resistance adjustment signal, and a third terminal of the resistance adjustment circuit 112 is grounded; wherein, the resistance adjustment circuit 112 is used to adjust the resistance of the voltage divider circuit 110 to adjust the voltage value output by the first terminal of the voltage divider circuit 110.

[0051] The power supply circuit 100 provided by the present invention can be used to convert the voltage provided by the power supply into the DC voltage required by the electrical equipment, thereby ensuring that the electrical equipment can operate normally.

[0052] Specifically, the power supply circuit 100 includes a control chip 102 , which includes an input terminal 104 (VIN) and an output terminal 106 (SW), wherein the input terminal 104 is used to connect to a power supply (VCC) and convert the current output by the power supply to output the current through the output terminal 106 .

[0053] The control chip 102 also includes a voltage divider circuit 110, a first end of the voltage divider circuit 110 is connected to the output terminal 106, and a second end of the voltage divider circuit 110 is connected to the feedback terminal 108 (FB). During the operation of the power supply circuit 100, the current output by the control chip 102 is divided by the voltage divider circuit 110, so as to set the voltage output by the control chip 102. At the same time, the second end of the voltage divider circuit 110 is connected to the feedback terminal 108 of the control chip 102, so that the control chip 102 can receive the feedback signal of the voltage divider circuit 110 to determine whether the current output voltage is at a preset voltage value. Further, the first end of the voltage divider circuit 110 and the third end of the voltage divider circuit 110 are connected to the load 136 to power the load 136, and the third end of the voltage divider circuit 110 is grounded so that the voltage value received by the load 136 is equal to the voltage value after the voltage divider circuit 110 divides the voltage.

[0054] Furthermore, the power supply circuit 100 further includes a resistance adjustment circuit 112, a first end of the resistance adjustment circuit 112 is connected to the second end of the voltage divider circuit 110, a second end of the resistance adjustment circuit 112 is connected to the resistance adjustment signal, and a third end of the resistance adjustment circuit 112 is grounded. By providing the resistance adjustment circuit 112, the resistance value of the voltage divider circuit 110 can be adjusted according to the resistance adjustment signal input to the second end of the resistance adjustment circuit 112, thereby adjusting the voltage value output from the first end of the voltage divider resistor.

[0055] Specifically, the first end of the voltage divider circuit 110 is connected to the output end 106 of the control chip 102, and the third end of the voltage divider circuit 110 is grounded. Since the current output by the output end 106 of the control chip 102 remains unchanged, when the resistance of the voltage divider circuit 110 changes, the voltage output by the first end of the voltage divider resistor will change, thereby achieving the adjustment of the output voltage of the power supply circuit 100. That is, the resistance adjustment signal is received by the second end of the resistance adjustment circuit 112, so that when the resistance adjustment signal is received, the resistance adjustment circuit 112 can adjust the resistance of the voltage divider circuit 110, thereby achieving the adjustment of the voltage output by the first end of the voltage divider circuit 110, that is, achieving the real-time adjustment of the output voltage of the power supply circuit 100 according to the resistance adjustment signal.

[0056] The power supply circuit 100 provided by the utility model can process the current output by the power supply through the control chip 102 by connecting the input terminal 104 of the control chip 102 to the power supply, so as to output the DC current required by the electrical equipment through the output terminal 106 of the control chip 102, and further divide the current output by the output terminal 106 of the control chip 102 through the voltage divider circuit 110, so as to set the voltage of the DC power output by the control chip 102. At the same time, by setting the resistance adjustment circuit 112, it is possible to adjust the resistance value of the voltage divider circuit 110 according to the resistance adjustment signal input by the second terminal of the resistance adjustment circuit 112, and then adjust the voltage value output by the first terminal of the voltage divider resistor, that is, to achieve real-time adjustment of the output voltage of the power supply circuit 100. Therefore, the power supply circuit 100 can output the corresponding voltage according to the different requirements of the connected electrical equipment, thereby improving the flexibility of the use of the power supply circuit 100.

[0057] In some embodiments, optionally, Figure 1 As shown, the resistance adjustment circuit 112 includes: a first resistor 114, one end of the first resistor 114 is connected to the second end of the voltage divider circuit 110; a switch element 116, a first end of the switch element 116 is connected to the second end of the first resistor 114, the other end of the switch element 116 is grounded, and the control end of the switch element 116 is connected to the resistance adjustment signal; wherein the resistance adjustment signal is used to control the conduction and disconnection between the first end of the switch element 116 and the second end of the switch element 116, and when the first end of the switch element 116 and the second end of the switch element 116 are conductive, the first resistor 114 is connected in parallel with at least a part of the voltage divider circuit 110.

[0058] In this embodiment, the resistance adjustment circuit 112 may include a first resistor 114 and a switch 116, wherein one end of the first resistor 114 is connected to the second end of the voltage divider circuit 110, and the other end of the first resistor 114 is grounded through the switch 116. That is, when the switch 116 is turned on, one end of the first resistor 114 is connected to the second end of the voltage divider circuit 110, and the other end of the first resistor 114 is grounded. At this time, the first resistor 114 is connected in parallel with at least a portion of the voltage divider circuit 110. It can be understood that the third end of the voltage divider circuit 110 is grounded, and the first resistor 114 is connected between the second end of the voltage divider circuit 110 and the ground, so that at least a portion of the voltage divider circuit 110 can be connected in parallel with the first resistor 114, so that the resistance value of the voltage divider circuit 110 can be changed, and then the voltage output by the first end of the voltage divider resistor is changed, that is, the voltage output by the voltage divider resistor is adjusted. By providing the first resistor 114 and the switch 116, the switch 116 can be controlled to be turned on and off according to the resistance adjustment signal inputted from the control end of the switch 116, so as to adjust the resistance value of the voltage divider circuit 110, and then adjust the voltage value outputted from the first end of the voltage divider resistor, that is, to achieve real-time adjustment of the output voltage of the power supply circuit 100. Thus, the power supply circuit 100 can output corresponding voltages according to different requirements of the connected electrical equipment, thereby improving the flexibility of the use of the power supply circuit 100.

[0059] Furthermore, the control end of the switch element 116 is connected to the resistance adjustment signal, so that the on and off states of the switch element 116 can be adjusted by the resistance adjustment signal. For example, when the resistance adjustment signal outputs a high level, the switch element 116 is in an on state, at which time the first resistor 114 is grounded, and at the same time the first resistor 114 is connected to the second end of the voltage divider circuit 110, so that the first resistor 114 is connected in parallel with a part of the voltage divider circuit 110, so as to adjust the voltage output by the voltage divider circuit 110. When the resistance adjustment signal outputs a low level, the switch element 116 is turned off, at which time the first resistor 114 is not connected in parallel with a part of the voltage divider circuit 110, and the voltage divider circuit 110 maintains the original output voltage.

[0060] In some embodiments, the switch element 116 includes a transistor, a source of the transistor is connected to the second end of the first resistor 114 , a drain of the transistor is grounded, and a gate of the transistor is connected to the resistance adjustment signal.

[0061] Specifically, the switch element 116 may include a transistor, the source of the transistor is connected to the second end of the first resistor 114, the drain of the transistor is grounded, and the gate of the transistor is connected to the resistance adjustment signal. The resistance adjustment signal can change the voltage of the gate of the transistor, thereby controlling the formation of a conductive channel in the channel between the source and the drain of the transistor to achieve the conduction and shutdown of the transistor. In this way, the first resistor 114 is connected in parallel to a part of the voltage divider circuit 110.

[0062] In some embodiments, optionally, Figure 1 As shown, the resistance adjustment circuit 112 further includes a diode 118 , wherein the anode of the diode 118 is connected to the drain of the transistor, and the cathode of the diode 118 is connected to the gate of the transistor.

[0063] In this embodiment, a diode 118 may be connected between the drain of the transistor and the gate of the transistor. Specifically, the anode of the diode 118 is connected to the drain of the transistor, and the cathode of the diode 118 is connected to the gate of the transistor. By providing the diode 118, the voltage between the drain of the transistor and the gate of the transistor can be guaranteed, and other interference signals during the operation of the power supply circuit 100 can be prevented from affecting the voltage between the drain of the transistor and the gate of the transistor, thereby ensuring that the gate of the diode 118 can accurately receive the resistance adjustment signal, thereby ensuring that the resistance adjustment circuit 112 can operate stably.

[0064] Specifically, the diode 118 may include a voltage stabilizing diode, which can not only ensure the voltage between the drain of the transistor and the gate of the transistor, but also achieve an overvoltage protection function to protect the transistor from burning out under a large current condition.

[0065] In some embodiments, optionally, Figure 1 As shown, the voltage divider circuit 110 includes: a second resistor 120, one end of the second resistor 120 is connected to the output terminal 106, and the other end of the second resistor 120 is connected to the feedback terminal 108; a third resistor 122, one end of the third resistor 122 is connected to the other end of the second resistor 120, and the other end of the third resistor 122 is grounded; wherein, when the switch element 116 is turned on, the third resistor 122 is connected in parallel with the first resistor 114.

[0066] In this embodiment, the voltage divider circuit 110 includes a second resistor 120 and a third resistor 122, wherein one end of the second resistor 120 is connected to the output terminal 106 of the control chip 102, and the other end of the second resistor 120 is connected to the feedback terminal 108 of the control chip 102. One end of the third resistor 122 is connected to the other end of the second resistor 120, and the other end of the third resistor 122 is grounded. By setting the resistance values ​​of the second resistor 120 and the third resistor 122, the voltage value output by the voltage divider circuit 110 can be set.

[0067] Further, in the resistance adjustment circuit 112, one end of the first resistor 114 is connected to the second end of the voltage divider circuit 110, that is, one end of the first resistor 114 is connected to the other end of the second resistor 120. When the switch 116 is turned on, the other end of the first resistor 114 is grounded, that is, one end of the first resistor 114 is connected to the other end of the second resistor 120, and the other end of the first resistor 114 is grounded. At this time, one end of the third resistor 122 is also connected to the other end of the second resistor 120, and the other end of the third resistor 122 is also grounded, that is, when the switch 116 is turned on, the first resistor 114 and the third resistor 122 are in a parallel connection state, thereby changing the resistance value of the voltage divider circuit 110, and then adjusting the voltage value output by the voltage divider circuit 110.

[0068] In some embodiments, the resistance adjustment circuit 112 includes a digital potentiometer, one end of the digital potentiometer is connected to the feedback terminal 108 , and the other end of the digital potentiometer is grounded.

[0069] Specifically, the resistance adjustment circuit 112 may also use a digital potentiometer, that is, one end of the digital potentiometer is connected to the feedback end 108 of the control chip 102, and the other end of the digital potentiometer is grounded. By connecting the digital potentiometer to the resistance adjustment signal, the operating parameters of the digital potentiometer are adjusted according to the resistance adjustment signal, and then the resistance of the digital potentiometer is connected in parallel to at least a part of the voltage divider circuit 110, so as to adjust the resistance of the voltage divider circuit 110, and then adjust the voltage value output by the voltage divider circuit 110.

[0070] It is understandable that the digital potentiometer is a new type of complementary metal oxide semiconductor integrated circuit that replaces the traditional mechanical potentiometer (analog potentiometer) and is used for processing digital and analog mixed signals. It can be used as a variable resistor to adjust the resistance of the voltage divider circuit 110.

[0071] In some embodiments, optionally, Figure 1As shown, the power supply circuit 100 further includes a reverse protection module 124 , one end of the reverse protection module 124 is connected to the first end of the voltage divider circuit 110 , and the other end of the reverse protection module 124 is used to be connected to the load 136 .

[0072] In this embodiment, the power supply circuit 100 may further include a reverse protection module 124, which is disposed between the first end of the voltage divider circuit 110 and the load 136, thereby achieving reverse protection for the current between the voltage divider circuit 110 and the load 136, thereby preventing the reverse flow of current from damaging the electrical components in the power supply circuit 100.

[0073] Furthermore, the power supply circuit 100 also includes an overcurrent protection module 126 , one end of the overcurrent protection module 126 is connected to one end of the voltage divider circuit 110 , and the other end of the overcurrent protection module 126 is used to be connected to the load 136 .

[0074] Specifically, an overcurrent protection module 126 may be further provided between the second end of the voltage divider circuit 110 and the load 136, that is, one end of the overcurrent protection module 126 is connected to the second end of the voltage divider circuit 110, and the other end of the overcurrent protection module 126 is connected to the load 136. By providing the overcurrent protection module 126, overcurrent protection can be implemented for the current between the voltage divider circuit 110 and the load 136, so as to avoid excessive current between the voltage divider circuit 110 and the load 136 and protect the power supply circuit 100 and the load 136.

[0075] Specifically, the overcurrent protection module 126 and the reverse protection module 124 may be connected in series between the voltage divider circuit 110 and the load 136 , thereby simultaneously achieving reverse protection and overcurrent protection between the voltage divider circuit 110 and the load 136 .

[0076] In some embodiments, optionally, Figure 1 As shown, the power supply circuit 100 further includes a filter circuit 128 , one end of the filter circuit 128 is connected to the output end 106 , and the other end of the filter circuit 128 is connected to the third end of the voltage divider circuit 110 .

[0077] In this embodiment, a filter circuit 128 may be provided between the output terminal 106 of the control chip 102 and the third terminal of the voltage divider circuit 110. By providing the filter circuit 128, the current output by the control chip 102 may be filtered, thereby ensuring the stability of the current output by the control chip 102. That is, the stability of the current output by the power supply circuit 100 is ensured, and the power supply circuit 100 is ensured to output a stable current to the load 136.

[0078] Furthermore, the filtering circuit 128 includes: a first inductor 130, one end of the first inductor 130 is connected to the output end 106, and the other end of the first inductor 130 is connected to the first end of the voltage divider circuit 110; a first capacitor 132, one end of the first capacitor 132 is connected to the first end of the voltage divider circuit 110, and the other end of the first capacitor 132 is connected to the third end of the voltage divider circuit 110.

[0079] Specifically, the filter circuit 128 may include a first inductor 130 and a first capacitor 132, wherein one end of the first inductor 130 is connected to the output end 106 of the control chip 102, and the other end of the first inductor 130 is connected to the first end of the voltage divider circuit 110. One end of the first capacitor 132 is connected to the first end of the voltage divider circuit 110, and the other end of the first capacitor 132 is connected to the third end of the voltage divider circuit 110. By providing the first inductor 130 and the first capacitor 132, the current outputted by the output end 106 of the control chip 102 can be filtered, thereby ensuring the stability of the current outputted by the control chip 102. That is, the stability of the current outputted by the power supply circuit 100 is ensured, and the power supply circuit 100 is ensured to output a stable current to the load 136.

[0080] In some embodiments, optionally, Figure 1 As shown, the control chip 102 further includes an enable signal input terminal 134 (EN), and the control chip 102 is used to output a voltage according to the received enable signal.

[0081] In this embodiment, the control chip 102 may further include an enable signal input terminal 134, through which an enable signal may be received, so that the power supply voltage received by the input terminal 104 may be converted according to the received enable signal, and then the DC current required by the electrical equipment may be output through the output terminal 106.

[0082] In some embodiments, Figure 2 As shown, the utility model further provides an electrical device 200, comprising a power supply circuit 100 as in any one of the above embodiments.

[0083] The electrical device 200 provided by the present invention comprises the power circuit 100 of any one of the above technical solutions. Therefore, the electrical device 200 has all the beneficial effects of the above power circuit 100, which will not be described in detail here.

[0084] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power supply circuit, characterized in that: include: A control chip, the control chip comprising an input terminal, an output terminal and a feedback terminal; A voltage divider circuit, wherein a first end of the voltage divider circuit is connected to the output end, a second end of the voltage divider circuit is connected to the feedback end, and a third end of the voltage divider circuit is grounded; Wherein, the first end of the voltage divider circuit and the third end of the voltage divider circuit are used to be connected to a load; a resistance adjusting circuit, wherein a first end of the resistance adjusting circuit is connected to a second end of the voltage dividing circuit, a second end of the resistance adjusting circuit is connected to a resistance adjusting signal, and a third end of the resistance adjusting circuit is grounded; The resistance adjustment circuit is used to adjust the resistance of the voltage divider circuit so as to adjust the voltage value outputted by the first end of the voltage divider circuit.

2. The power supply circuit according to claim 1, characterized in that: The resistance adjustment circuit comprises: a first resistor, one end of which is connected to the second end of the voltage divider circuit; a switch element, wherein a first end of the switch element is connected to the other end of the first resistor, a second end of the switch element is grounded, and a control end of the switch element is connected to the resistance adjustment signal; The resistance adjustment signal is used to control the conduction and disconnection between the first end of the switch element and the second end of the switch element. When the conduction is between the first end of the switch element and the second end of the switch element, the first resistor is connected in parallel with at least a part of the voltage divider circuit.

3. The power supply circuit according to claim 2, characterized in that: The switch element comprises: A transistor, a source of the transistor is connected to the second end of the first resistor, a drain of the transistor is grounded, and a gate of the transistor is connected to the resistance adjustment signal.

4. The power supply circuit according to claim 3, characterized in that: The resistance adjustment circuit further includes: A diode, wherein an anode of the diode is connected to the drain of the transistor, and a cathode of the diode is connected to the gate of the transistor.

5. The power supply circuit according to claim 2, characterized in that: The voltage divider circuit comprises: a second resistor, one end of the second resistor being connected to the output end, and the other end of the second resistor being connected to the feedback end; a third resistor, one end of the third resistor being connected to the other end of the second resistor, and the other end of the third resistor being grounded; Wherein, when the switch is turned on, the third resistor is connected in parallel with the first resistor.

6. The power supply circuit according to any one of claims 1 to 5, characterized in that: The resistance adjustment circuit comprises: A digital potentiometer, one end of the digital potentiometer is connected to the feedback end, and the other end of the digital potentiometer is grounded.

7. The power supply circuit according to any one of claims 1 to 5, characterized in that: Also includes: A reverse protection module, one end of which is connected to the first end of the voltage divider circuit, and the other end of which is used to be connected to the load.

8. The power supply circuit according to any one of claims 1 to 5, characterized in that: Also includes: An overcurrent protection module, one end of which is connected to one end of the voltage divider circuit, and the other end of which is used to be connected to the load.

9. The power supply circuit according to any one of claims 1 to 5, characterized in that: Also includes: A filter circuit, one end of the filter circuit is connected to the output end, and the other end of the filter circuit is connected to the third end of the voltage divider circuit.

10. The power supply circuit according to claim 9, characterized in that: The filtering circuit comprises: a first inductor, one end of the first inductor being connected to the output end, and the other end of the first inductor being connected to the first end of the voltage divider circuit; A first capacitor, one end of the first capacitor is connected to the first end of the voltage divider circuit, and the other end of the first capacitor is connected to the third end of the voltage divider circuit.

11. The power supply circuit according to any one of claims 1 to 5, characterized in that: The control chip further includes an enable signal input terminal, and the control chip is used to output a voltage according to a received enable signal.

12. An electrical device, characterized in that: include: A power supply circuit as claimed in any one of claims 1 to 11.

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