Multi-output power supply circuit and electronic equipment

Abstract

The utility model discloses a multi-output power supply circuit and electronic equipment. The multi-output power supply circuit comprises a transformer, a voltage stabilization branch, a switch branch, a first controllable voltage stabilization source, a filtering branch and a second controllable voltage stabilization source. The transformer comprises a primary side and a first secondary side, the primary side inputs a first power supply, and the first secondary side outputs a second power supply, a third power supply and a fourth power supply. The voltage stabilization branch outputs a stable first output voltage based on the voltage of the second power supply. The switch branch is turned on in response to the second power supply to establish a connection between the first secondary side and the first controllable stabilized voltage source. The first controllable voltage stabilizing source responds to the third power supply to output constant voltage so as to stabilize the voltage of the second end of the switch branch into second output voltage. And the filtering branch filters the fourth power supply. The second controllable voltage stabilizing source responds to the filtered fourth power supply and outputs constant voltage, so that the voltage of the second end of the filtering branch is stabilized to be third output voltage. Through the mode, the size can be reduced, and the cost is reduced.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electronic circuits, and in particular to a multi-channel output power supply circuit and an electronic device. Background Art

[0002] With the rapid development of electronic information, electronic equipment has developed rapidly. In order to ensure the stability and reliability of power supply, most electronic equipment in the mainstream power supply scheme is powered by an independent DC power supply. However, in these devices, multiple loads that need to be powered are often concentrated inside a single device, and the power supply voltages required by these loads are also different, so it is necessary to configure a power supply for each load separately. By combining multiple independent DC power supply modules together, each independent power supply provides the required voltage to the corresponding load, so that the needs of multiple loads in the device for different power supply voltages can be solved.

[0003] However, in this solution, the integration of multiple independent power supplies results in a power supply that is too large and has a high cost. Utility Model Content

[0004] The embodiments of the present application provide a multi-output power supply circuit and an electronic device, which can reduce the size and reduce the cost.

[0005] In a first aspect, an embodiment of the present application provides a multi-output power supply circuit, comprising:

[0006] A transformer, comprising a primary side and a first secondary side, wherein a first end of the primary side inputs a first power source, a first end of the first secondary side outputs a second power source, a second end of the first secondary side outputs a third power source, and a third end of the first secondary side outputs a fourth power source;

[0007] a voltage stabilizing branch, connected to the first end of the first secondary side, and configured to output a stable first output voltage based on the voltage of the second power supply;

[0008] a switch branch and a first controllable regulated voltage source, wherein a first end of the switch branch is connected to a first end of the first secondary side, a second end of the switch branch is connected to a reference end of the first controllable regulated voltage source, and a third end of the switch branch is connected to a second end of the first secondary side, and the switch branch is configured to be turned on in response to the second power supply to establish a connection between the second end of the first secondary side and the reference end of the first controllable regulated voltage source;

[0009] The first controllable regulated voltage source is used to output a constant voltage at a reference end of the first controllable regulated voltage source in response to the third power supply, so as to stabilize the voltage at the second end of the switch branch to a second output voltage;

[0010] A filter branch and a second controllable regulated voltage source, wherein a first end of the filter branch is connected to a third end of the first secondary side, a second end of the filter branch is connected to a reference end of the second controllable regulated voltage source, and the filter branch is used to filter the fourth power supply;

[0011] The second controllable regulated voltage source is used to output a constant voltage at a reference end of the second controllable regulated voltage source in response to the filtered fourth power supply, so as to stabilize the voltage at the second end of the filter branch to a third output voltage.

[0012] In one or more embodiments, the multi-output power supply circuit further includes:

[0013] A signal processing branch is connected between the AC power supply and the first end of the primary side, and is used to filter and rectify the AC power supply and then output the first power supply to the first end of the primary side.

[0014] In one or more embodiments, the voltage stabilizing branch includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a first diode and a three-terminal voltage regulator;

[0015] The anode of the first diode is connected to the first end of the first secondary side, the anode of the first diode is connected to the input end of the three-terminal regulator, the first capacitor and the first resistor are connected in series between the anode and the cathode of the first diode, the second capacitor is connected between the input end of the three-terminal regulator and the first ground, the third capacitor is connected between the output end of the three-terminal regulator and the first ground, and the fourth capacitor is connected in parallel with the third capacitor.

[0016] In one or more embodiments, the switch branch includes a first switch tube;

[0017] The first end of the first switch tube is connected to the first end of the first secondary side, the second end of the first switch tube is connected to the reference end of the first controllable voltage source, and the third end of the first switch tube is connected to the second end of the first secondary side.

[0018] In one or more embodiments, the multi-output power supply circuit further includes a first voltage regulator diode, a second diode, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor and an eleventh capacitor;

[0019] The anode of the second diode is connected to the second end of the first secondary side, the cathode of the second diode is connected to the third end of the first switch tube, the second resistor and the fifth capacitor are connected in series between the anode and cathode of the second diode, the first end of the first switch tube is respectively connected to the cathode of the first voltage regulator diode and the cathode of the first controllable voltage regulator source, the second end of the first switch tube is connected to the anode of the first voltage regulator diode, the third resistor is connected between the first end of the first switch tube and the first end of the first secondary side, the sixth capacitor is connected between the first end of the first switch tube and the first ground, the seventh capacitor is connected between the first end of the first switch tube and the reference end of the first controllable voltage regulator source, the fourth resistor is connected between the second end of the first switch tube and the reference end of the first controllable voltage regulator source, the fifth resistor is connected between the reference end of the first controllable voltage regulator source and the first ground, the eighth capacitor is connected between the second end of the first switch tube and the first ground, the ninth capacitor is connected in parallel with the eighth capacitor, the tenth capacitor is connected between the third end of the first switch tube and the first ground, and the eleventh capacitor is connected in parallel with the tenth capacitor.

[0020] In one or more embodiments, the filtering branch includes a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor and a first inductor;

[0021] The twelfth capacitor is connected between the third end of the first secondary side and the first ground, the first inductor is connected to the third end of the first secondary side and the first end of the thirteenth capacitor, the second end of the thirteenth capacitor is connected to the first ground, and the fourteenth capacitor is connected in parallel with the thirteenth capacitor.

[0022] In one or more embodiments, the multi-output power supply circuit further includes a third diode, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a fifteenth capacitor, and a sixteenth capacitor;

[0023] The anode of the third diode is connected to the third end of the first secondary side, the connection point between the twelfth capacitor and the first inductor is connected to the cathode of the third diode, the sixth resistor and the fifteenth capacitor are connected in series between the anode and the cathode of the third diode, the seventh resistor and the eighth resistor are connected in series between the first end of the thirteenth capacitor and the first ground, the connection point between the seventh resistor and the eighth resistor is connected to the reference end of the second controllable voltage-stabilizing source, and the ninth resistor and the sixteenth capacitor are connected in series between the cathode and the reference end of the second controllable voltage-stabilizing source.

[0024] In one or more embodiments, the multi-output power supply circuit further includes a power management chip, an optocoupler, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a fourth diode and a fifth diode, and the transformer further includes a second secondary side;

[0025] The switch pin of the power management chip is respectively connected to the second end of the primary side and the anode of the fifth diode, the cathode of the fifth diode is connected to the first end of the primary side through the twenty-first capacitor, the sixteenth resistor and the seventeenth resistor are both connected in parallel with the twenty-first capacitor, the twentieth capacitor is connected between the first end of the primary side and the first end of the second secondary side, the anode of the fourth diode is connected to the second end of the second secondary side, the cathode of the fourth diode is connected to the power supply pin of the power management chip through the fifteenth resistor, and the nineteenth capacitor is connected to the power management chip. The eighteenth capacitor is connected between the power supply pin of the power management chip and the second ground, the seventeenth capacitor and the light receiver of the optocoupler are both connected between the feedback pin of the power management chip and the second ground, the thirteenth resistor and the fourteenth resistor are both connected between the current detection pin of the power management chip and the second ground, the tenth resistor is connected between the first end of the filter branch and the first end of the light emitter of the optocoupler, the eleventh resistor is connected between the first end and the second end of the light emitter of the optocoupler, and the twelfth resistor is connected between the first ground and the second ground.

[0026] In one or more embodiments, the signal processing branch includes a fuse, a varistor, a second inductor, a third inductor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor and a rectifier bridge;

[0027] The fuse and the varistor are connected in series between the first end and the second end of the AC power supply, the connection point between the fuse and the varistor is connected to the first end of the second inductor, the second end of the second inductor is connected to the second end of the AC power supply, the third end of the second inductor is connected to the first end of the third inductor, the fourth end of the second inductor is connected to the second end of the third inductor, the eighteenth resistor and the nineteenth resistor are connected in series between the third end and the fourth end of the second inductor, the twenty-third capacitor is connected between the third end and the fourth end of the second inductor, the twenty-fourth capacitor is connected between the third end and the fourth end of the third inductor, the first end of the rectifier bridge is connected to the third end of the third inductor, the second end of the rectifier bridge is connected to the fourth end of the third inductor, the third end of the rectifier bridge is connected to the second ground through the twenty-tenth resistor, the fourth end of the rectifier bridge is respectively connected to the first end of the primary side and the first end of the twenty-fifth capacitor, and the second end of the twenty-fifth capacitor is connected to the second ground.

[0028] In a second aspect, an embodiment of the present application provides an electronic device, comprising the multi-output power supply circuit as described above and a plurality of loads.

[0029] The beneficial effect of the present application is that the multi-channel output power supply circuit of the embodiment of the present application includes a transformer, a voltage stabilizing branch, a switch branch, a first controllable voltage stabilizing source, a filter branch and a second controllable voltage stabilizing source. The transformer includes a primary side and a first secondary side, the first end of the primary side inputs a first power supply, the first end of the first secondary side outputs a second power supply, the second end of the first secondary side outputs a third power supply, and the third end of the first secondary side outputs a fourth power supply. The voltage stabilizing branch is connected to the first end of the first secondary side, and is used to output a stable first output voltage based on the voltage of the second power supply. The first end of the switch branch is connected to the first end of the first secondary side, the second end of the switch branch is connected to the reference end of the first controllable voltage stabilizing source, the third end of the switch branch is connected to the second end of the first secondary side, and the switch branch is used to conduct in response to the second power supply to establish a connection between the second end of the first secondary side and the reference end of the first controllable voltage stabilizing source. The first controllable voltage stabilizing source is used to output a constant voltage at the reference end of the first controllable voltage stabilization in response to the third power supply, so as to stabilize the voltage of the second end of the switch branch to the second output voltage. The first end of the filter branch is connected to the third end of the first secondary side, the second end of the filter branch is connected to the reference end of the second controllable voltage-stabilizing source, and the filter branch is used to filter the fourth power supply. The second controllable voltage-stabilizing source is used to output a constant voltage at the reference end of the second controllable voltage-stabilizing source in response to the filtered fourth power supply, so as to stabilize the voltage at the second end of the filter branch to a third output voltage. Through the above manner, the second power supply, the third power supply and the fourth power supply are output through a circuit structure to meet the power supply requirements of different loads. Compared with the solution of setting multiple independent DC power supplies in the related art, the solution of using a circuit structure in the present application is smaller in size and lower in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] One or more embodiments are exemplarily described by the figures in the accompanying drawings, which are not intended to limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0031] Figure 1 This is a schematic diagram of the structure of the multi-channel output power supply circuit provided in the embodiment of the present application. Figure 1 ;

[0032] Figure 2 This is a schematic diagram of the structure of the multi-channel output power supply circuit provided in the embodiment of the present application. Figure 2 ;

[0033] Figure 3 It is a circuit structure diagram of a multi-channel output power supply circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that, when an element is described as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.

[0036] In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no structural conflict between them.

[0037] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a multi-channel output power supply circuit provided in an embodiment of the present application. Figure 1 As shown, the multi-output power supply circuit 100 includes a transformer T1, a voltage stabilizing branch 10, a switch branch 20, a first controllable voltage stabilizing source DW1, a filter branch 30 and a second controllable voltage stabilizing source DW2.

[0038] The transformer T1 includes a primary side LA1 and a first secondary side LB1. The first end of the switch branch 20 is connected to the first end of the first secondary side LB1, the second end of the switch branch 20 is connected to the reference end of the first controllable voltage stabilizing source DW1, and the third end of the switch branch 20 is connected to the second end of the first secondary side LB1. The voltage stabilizing branch 10 is connected to the first end of the first secondary side LB1. The first end of the filter branch 30 is connected to the third end of the first secondary side LB1, and the second end of the filter branch 30 is connected to the reference end of the second controllable voltage stabilizing source DW2.

[0039] Specifically, the first end of the primary side LA1 inputs the first power supply, the first end of the first secondary side LB1 outputs the second power supply, the second end of the first secondary side LB1 outputs the third power supply, and the third end of the first secondary side LB1 outputs the fourth power supply. The voltage stabilizing branch 10 is used to output a stable first output voltage VO1 based on the voltage of the second power supply. The switch branch 20 is used to be turned on in response to the second power supply to establish a connection between the second end of the first secondary side LB1 and the reference end of the first controllable voltage stabilizing source DW1. The first controllable voltage stabilizing source DW1 is used to output a constant voltage at the reference end of the first controllable voltage stabilizing source DW1 in response to the third power supply, so as to stabilize the voltage at the second end of the switch branch 20 to the second output voltage VO2. The filter branch 30 is used to filter the fourth power supply. The second controllable voltage stabilizing source DW2 is used to output a constant voltage at the reference end of the second controllable voltage stabilizing source DW2 in response to the filtered fourth power supply, so as to stabilize the voltage at the second end of the filter branch 30 to the third output voltage VO3.

[0040] Through the above method, the second power supply, the third power supply and the fourth power supply are output through a circuit structure to meet the power supply requirements of different loads. For example, the second power supply is relatively stable and can meet the requirements of loads with higher stability requirements, such as plasma loads. Plasma has very high requirements on the stability of the power supply. Since the high temperature and high energy state of plasma is easily affected by external disturbances, the power supply must be able to continuously and stably provide the required energy to maintain the stable state of plasma. In addition, compared with the solution of setting multiple independent DC power supplies in the related art, the solution of the present application using a circuit structure is smaller in size and lower in cost.

[0041] In one embodiment, if Figure 2 As shown, the multi-output power supply circuit 100 further includes a signal processing branch 40 .

[0042] The signal processing branch 40 is connected between the AC power source VI N and the first end of the primary LA1, and is used to filter and rectify the AC power source VIN and output the first power to the first end of the primary LA1. In some specific embodiments, the AC power source VI N is configured as a mains supply.

[0043] Please refer to Figure 3 , Figure 3 The following is an example of a circuit structure of a multi-channel output power supply circuit. Figure 3 As shown, the voltage stabilizing branch U1 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a first diode D1 and a three-terminal voltage regulator U1.

[0044] Among them, the anode of the first diode D1 is connected to the first end of the first secondary side LB1, the anode of the first diode D1 is connected to the input end of the three-terminal regulator U1, the first capacitor C1 and the first resistor R1 are connected in series between the anode and the cathode of the first diode D1, the second capacitor C2 is connected between the input end of the three-terminal regulator U1 and the first ground GND1, the third capacitor C3 is connected between the output end of the three-terminal regulator U1 and the first ground GND1, and the fourth capacitor C4 is connected in parallel with the third capacitor C3.

[0045] Specifically, the first diode D1 is used for freewheeling. The first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, and the first resistor R1 are all used for filtering. In a specific embodiment, the three-terminal voltage regulator U1 selects a voltage regulator of model 78L12 to output a stable 12V voltage, that is, the voltage of the first power supply is 12V.

[0046] In this embodiment, the switch branch 20 includes a first switch tube Q1 .

[0047] The first end of the first switch tube Q1 is connected to the first end of the first secondary side LB1, the second end of the first switch tube Q1 is connected to the reference end of the first controllable voltage source DW1, and the third end of the first switch tube Q1 is connected to the second end of the first secondary side LB1.

[0048] In this embodiment, the first switch tube Q1 is an NMOS tube as an example. The gate of the NMOS tube is the first end of the first switch tube Q1, the source of the NMOS tube is the second end of the first switch tube Q1, and the drain of the NMOS tube is the third end of the first switch tube Q1.

[0049] In addition, the first switch tube Q1 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0050] In this embodiment, the multi-output power supply circuit 100 further includes a first voltage stabilizing diode DA1, a second diode D2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10 and an eleventh capacitor C11.

[0051] Among them, the anode of the second diode D2 is connected to the second end of the first secondary side LB1, the cathode of the second diode D2 is connected to the third end of the first switch tube Q1, the second resistor R2 and the fifth capacitor C5 are connected in series between the anode and the cathode of the second diode D2, the first end of the first switch tube Q1 is respectively connected to the cathode of the first voltage regulator diode DA1 and the cathode of the first controllable voltage regulator source DW1, the second end of the first switch tube Q1 is connected to the anode of the first voltage regulator diode DA1, the third resistor R3 is connected between the first end of the first switch tube Q1 and the first end of the first secondary side LB1, and the sixth capacitor C6 is connected between the first end of the first switch tube Q1 and the first ground GND1, the seventh capacitor C7 is connected between the first end of the first switch tube Q1 and the reference end of the first controllable voltage-stabilizing source DW1, the fourth resistor R4 is connected between the second end of the first switch tube Q1 and the reference end of the first controllable voltage-stabilizing source DW1, the fifth resistor R5 is connected between the reference end of the first controllable voltage-stabilizing source DW1 and the first ground GND1, the eighth capacitor C8 is connected between the second end of the first switch tube Q1 and the first ground GND1, the ninth capacitor C9 is connected in parallel with the eighth capacitor C8, the tenth capacitor C10 is connected between the third end of the first switch tube Q1 and the first ground GND1, and the eleventh capacitor C11 is connected in parallel with the tenth capacitor C10.

[0052] Specifically, when the first end of the first secondary side LB1 outputs the second power supply, the second power supply acts on the first end of the first switch tube Q1 through the third resistor R3, so that the first switch tube Q1 is turned on. The third power supply output from the second end of the first secondary side LB1 is divided by the fourth resistor R4 and the fifth resistor R5 through the first switch tube Q1, and the first controllable voltage regulator DW1 is turned on. At the same time, the voltage at the reference end of the first controllable voltage regulator DW1 is maintained at a fixed value, which is related to the selection of the first controllable voltage regulator DW1. For example, when the first controllable voltage regulator DW1 selects a controllable precision voltage regulator of model TL431, the voltage at the reference end of the first controllable voltage regulator DW1 is maintained at 2.5V. The voltage at the reference end of the first controllable voltage regulator DW1 acts on the connection point between the fourth resistor R4 and the fifth resistor R5, and then, under the premise that the resistance values ​​of the fourth resistor R4 and the fifth resistor R5 remain unchanged, the voltage at the second end of the first switch tube Q1 is stabilized to the second output voltage VO2 unchanged. In this embodiment, the third resistor R3 is used for current limiting, the second diode D2 is used for freewheeling, and the second resistor R2, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10 and the eleventh capacitor C11 are used for filtering.

[0053] In this embodiment, the filtering branch 30 includes a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14 and a first inductor L1.

[0054] Among them, the twelfth capacitor C12 is connected between the third end of the first secondary side LB1 and the first ground GND1, the first inductor L1 is connected to the third end of the first secondary side LB1 and the first end of the thirteenth capacitor C13, the second end of the thirteenth capacitor C13 is connected to the first ground GND1, and the fourteenth capacitor C14 is connected in parallel with the thirteenth capacitor C13.

[0055] Specifically, the twelfth capacitor C12, the thirteenth capacitor C13, the fourteenth capacitor C14 and the first inductor L1 are used for filtering.

[0056] In this embodiment, the multi-output power supply circuit 100 further includes a third diode D3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fifteenth capacitor C15, and a sixteenth capacitor C16.

[0057] Among them, the anode of the third diode D3 is connected to the third end of the first secondary side LB1, the connection point between the twelfth capacitor C12 and the first inductor L1 is connected to the cathode of the third diode D3, the sixth resistor R6 and the fifteenth capacitor C15 are connected in series between the anode and the cathode of the third diode D3, the seventh resistor R7 and the eighth resistor R8 are connected in series between the first end of the thirteenth capacitor C13 and the first ground GND1, the connection point between the seventh resistor R7 and the eighth resistor R8 is connected to the reference end of the second controllable voltage regulator DW2, and the ninth resistor R9 and the sixteenth capacitor C16 are connected in series between the cathode and the reference end of the second controllable voltage regulator DW2.

[0058] Specifically, the third diode D3 is used for freewheeling. The sixth resistor R6, the ninth resistor R9, the fifteenth capacitor C15 and the sixteenth capacitor C16 are used for filtering. The seventh resistor R7 and the eighth resistor R8 are used for voltage division.

[0059] In this embodiment, the fourth power source output from the third end of the first secondary side LB1 is divided by the seventh resistor R7 and the eighth resistor R8, and then acts on the reference end of the second controllable voltage-stabilizing source DW2, so that the second controllable voltage-stabilizing source DW2 is turned on. Then, the voltage at the reference end of the second controllable voltage-stabilizing source DW2 is maintained at a fixed value, which is related to the selection of the second controllable voltage-stabilizing source DW2. For example, when the second controllable voltage-stabilizing source DW2 selects a controllable precision voltage-stabilizing source of model TL431, the voltage at the reference end of the second controllable voltage-stabilizing source DW2 is maintained at 2.5V. The voltage at the reference end of the second controllable voltage-stabilizing source DW2 acts on the connection point between the seventh resistor R7 and the eighth resistor R8, and then, under the premise that the resistance values ​​of the seventh resistor R7 and the eighth resistor R8 remain unchanged, the voltage at the second end of the first inductor L1 is stabilized to the third output voltage VO3 unchanged.

[0060] In this embodiment, the multi-output power supply circuit 100 also includes a power management chip U2, an optocoupler U3, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22, a fourth diode D4 and a fifth diode D5, and the transformer T1 also includes a second secondary side LB2.

[0061] Among them, the switch pin SW of the power management chip U2 is respectively connected to the second end of the primary side LA1 and the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected to the first end of the primary side LA1 through the twenty-first capacitor C21, the sixteenth resistor R16 and the seventeenth resistor R17 are both connected in parallel with the twenty-first capacitor C12, the twentieth capacitor C20 is connected between the first end of the primary side LA1 and the first end of the second secondary side LB1, the anode of the fourth diode D4 is connected to the second end of the second secondary side LB2, the cathode of the fourth diode D4 is connected to the power supply pin VDD of the power management chip U2 through the fifteenth resistor R15, and the nineteenth capacitor C19 is connected to the power supply pin VDD and The eighteenth capacitor C18 is connected between the power supply pin VDD of the power management chip U2 and the second ground GND2, the seventeenth capacitor C17 and the light receiver of the optocoupler U3 are both connected between the feedback pin COMP of the power management chip U2 and the second ground GND2, the thirteenth resistor R13 and the fourteenth resistor R14 are both connected between the current detection pin CS of the power management chip U2 and the second ground GND2, the tenth resistor R10 is connected between the first end of the filter branch 30 and the first end of the light emitter of the optocoupler U3, the eleventh resistor R11 is connected between the first end and the second end of the light emitter of the optocoupler U3, and the twelfth resistor R12 is connected between the first ground GND1 and the second ground GND2.

[0062] Specifically, the optocoupler U3 is used to isolate and output a feedback signal to the feedback pin COMP of the power management chip U2. The seventeenth capacitor C17, the eighteenth capacitor C18, the nineteenth capacitor C19, the twentieth capacitor C20, the twenty-first capacitor C21, and the twenty-second capacitor C22 are used for filtering. The second secondary side LB2 is used to power the power management chip U2. In a specific embodiment, the power management chip U2 uses a power management chip model PN8147H, which provides comprehensive and excellent intelligent protection functions, including periodic overcurrent protection (externally adjustable), overload protection, overvoltage protection, CS short circuit protection, and soft start function.

[0063] In this embodiment, the signal processing branch 40 includes a fuse F1, a varistor VR1, a second inductor L2, a third inductor L3, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25 and a rectifier bridge U4.

[0064] The fuse F1 and the varistor VR1 are connected in series between the first and second ends of the AC power source VI N, the connection point between the fuse F1 and the varistor VR1 is connected to the first end of the second inductor L2, and the second end of the second inductor L2 is connected to the AC power source VI N. The second end of the rectifier bridge U4 is connected to the third end of the third inductor L3, the second end of the rectifier bridge U4 is connected to the fourth end of the third inductor L3, the third end of the rectifier bridge U4 is connected to the second ground GND2 through the twentieth resistor R20, the fourth end of the rectifier bridge U4 is respectively connected to the first end of the primary side LA1 and the first end of the twenty-fifth capacitor C25, and the second end of the twenty-fifth capacitor C25 is connected to the second ground GND2.

[0065] Specifically, the fuse F1 is used to achieve short circuit protection. The resistance value of the varistor VR1 will change according to the size of its voltage, so that the varistor VR1 can play an overvoltage protection role. The second inductor L2, the third inductor L3, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20, the twenty-third capacitor C23, the twenty-fourth capacitor C24, and the twenty-fifth capacitor C25 are used for filtering. The rectifier bridge U4 is used for rectification.

[0066] An embodiment of the present application further provides an electronic device, which includes the multi-output power supply circuit 100 in any embodiment of the present application and a plurality of loads.

[0067] In some specific embodiments, the electronic device is an air purifier. The load in the electronic device includes a motor, plasma, UV (Ultra-Viol et) lamp and MCU (Microcontroller Unit), etc. Among them, the voltage of the second power supply is 15V (to power the motor); the first output voltage is 12V (to power the plasma); the second output voltage is 6.2V (to power the UV lamp); and the third output voltage is 5V (to power the MCU).

[0068] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

[0069] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. Under the idea of ​​the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. It should be understood by ordinary technicians in this field that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-channel output power supply circuit, characterized in that: include: A transformer, comprising a primary side and a first secondary side, wherein a first end of the primary side inputs a first power source, a first end of the first secondary side outputs a second power source, a second end of the first secondary side outputs a third power source, and a third end of the first secondary side outputs a fourth power source; a voltage stabilizing branch, connected to the first end of the first secondary side, and configured to output a stable first output voltage based on the voltage of the second power supply; a switch branch and a first controllable regulated voltage source, wherein a first end of the switch branch is connected to a first end of the first secondary side, a second end of the switch branch is connected to a reference end of the first controllable regulated voltage source, and a third end of the switch branch is connected to a second end of the first secondary side, and the switch branch is configured to be turned on in response to the second power supply to establish a connection between the second end of the first secondary side and the reference end of the first controllable regulated voltage source; The first controllable regulated voltage source is used to output a constant voltage at a reference end of the first controllable regulated voltage source in response to the third power supply, so as to stabilize the voltage at the second end of the switch branch to a second output voltage; A filter branch and a second controllable regulated voltage source, wherein a first end of the filter branch is connected to a third end of the first secondary side, a second end of the filter branch is connected to a reference end of the second controllable regulated voltage source, and the filter branch is used to filter the fourth power supply; The second controllable regulated voltage source is used to output a constant voltage at a reference end of the second controllable regulated voltage source in response to the filtered fourth power supply, so as to stabilize the voltage at the second end of the filter branch to a third output voltage.

2. The multi-output power supply circuit according to claim 1, characterized in that: Also includes: A signal processing branch is connected between the AC power supply and the first end of the primary side, and is used to filter and rectify the AC power supply and then output the first power supply to the first end of the primary side.

3. The multi-output power supply circuit according to claim 1 or 2, characterized in that: The voltage stabilizing branch includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a first diode and a three-terminal voltage stabilizer; The anode of the first diode is connected to the first end of the first secondary side, the anode of the first diode is connected to the input end of the three-terminal regulator, the first capacitor and the first resistor are connected in series between the anode and the cathode of the first diode, the second capacitor is connected between the input end of the three-terminal regulator and the first ground, the third capacitor is connected between the output end of the three-terminal regulator and the first ground, and the fourth capacitor is connected in parallel with the third capacitor.

4. The multi-output power supply circuit according to claim 1 or 2, characterized in that: The switch branch includes a first switch tube; The first end of the first switch tube is connected to the first end of the first secondary side, the second end of the first switch tube is connected to the reference end of the first controllable voltage source, and the third end of the first switch tube is connected to the second end of the first secondary side.

5. The multi-output power supply circuit according to claim 4, characterized in that: The multi-channel output power supply circuit further includes a first voltage stabilizing diode, a second diode, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor and an eleventh capacitor; The anode of the second diode is connected to the second end of the first secondary side, the cathode of the second diode is connected to the third end of the first switch tube, the second resistor and the fifth capacitor are connected in series between the anode and cathode of the second diode, the first end of the first switch tube is respectively connected to the cathode of the first voltage regulator diode and the cathode of the first controllable voltage regulator source, the second end of the first switch tube is connected to the anode of the first voltage regulator diode, the third resistor is connected between the first end of the first switch tube and the first end of the first secondary side, the sixth capacitor is connected between the first end of the first switch tube and the first ground, the seventh capacitor is connected between the first end of the first switch tube and the reference end of the first controllable voltage regulator source, the fourth resistor is connected between the second end of the first switch tube and the reference end of the first controllable voltage regulator source, the fifth resistor is connected between the reference end of the first controllable voltage regulator source and the first ground, the eighth capacitor is connected between the second end of the first switch tube and the first ground, the ninth capacitor is connected in parallel with the eighth capacitor, the tenth capacitor is connected between the third end of the first switch tube and the first ground, and the eleventh capacitor is connected in parallel with the tenth capacitor.

6. The multi-output power supply circuit according to claim 1 or 2, characterized in that: The filtering branch includes a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor and a first inductor; The twelfth capacitor is connected between the third end of the first secondary side and the first ground, the first inductor is connected to the third end of the first secondary side and the first end of the thirteenth capacitor, the second end of the thirteenth capacitor is connected to the first ground, and the fourteenth capacitor is connected in parallel with the thirteenth capacitor.

7. The multi-output power supply circuit according to claim 6, characterized in that: The multi-channel output power supply circuit further includes a third diode, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a fifteenth capacitor and a sixteenth capacitor; The anode of the third diode is connected to the third end of the first secondary side, the connection point between the twelfth capacitor and the first inductor is connected to the cathode of the third diode, the sixth resistor and the fifteenth capacitor are connected in series between the anode and the cathode of the third diode, the seventh resistor and the eighth resistor are connected in series between the first end of the thirteenth capacitor and the first ground, the connection point between the seventh resistor and the eighth resistor is connected to the reference end of the second controllable voltage-stabilizing source, and the ninth resistor and the sixteenth capacitor are connected in series between the cathode and the reference end of the second controllable voltage-stabilizing source.

8. The multi-output power supply circuit according to claim 1 or 2, characterized in that: The multi-channel output power supply circuit further includes a power management chip, an optical coupler, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a seventeenth capacitor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor, a fourth diode and a fifth diode, and the transformer further includes a second secondary side; The switch pin of the power management chip is respectively connected to the second end of the primary side and the anode of the fifth diode, the cathode of the fifth diode is connected to the first end of the primary side through the twenty-first capacitor, the sixteenth resistor and the seventeenth resistor are both connected in parallel with the twenty-first capacitor, the twentieth capacitor is connected between the first end of the primary side and the first end of the second secondary side, the anode of the fourth diode is connected to the second end of the second secondary side, the cathode of the fourth diode is connected to the power supply pin of the power management chip through the fifteenth resistor, and the nineteenth capacitor is connected to the power management chip. The eighteenth capacitor is connected between the power supply pin of the power management chip and the second ground, the seventeenth capacitor and the light receiver of the optocoupler are both connected between the feedback pin of the power management chip and the second ground, the thirteenth resistor and the fourteenth resistor are both connected between the current detection pin of the power management chip and the second ground, the tenth resistor is connected between the first end of the filter branch and the first end of the light emitter of the optocoupler, the eleventh resistor is connected between the first end and the second end of the light emitter of the optocoupler, and the twelfth resistor is connected between the first ground and the second ground.

9. The multi-output power supply circuit according to claim 2, characterized in that: The signal processing branch includes a fuse, a varistor, a second inductor, a third inductor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor and a rectifier bridge; The fuse and the varistor are connected in series between the first end and the second end of the AC power supply, the connection point between the fuse and the varistor is connected to the first end of the second inductor, the second end of the second inductor is connected to the second end of the AC power supply, the third end of the second inductor is connected to the first end of the third inductor, the fourth end of the second inductor is connected to the second end of the third inductor, the eighteenth resistor and the nineteenth resistor are connected in series between the third end and the fourth end of the second inductor, the twenty-third capacitor is connected between the third end and the fourth end of the second inductor, the twenty-fourth capacitor is connected between the third end and the fourth end of the third inductor, the first end of the rectifier bridge is connected to the third end of the third inductor, the second end of the rectifier bridge is connected to the fourth end of the third inductor, the third end of the rectifier bridge is connected to the second ground through the twenty-tenth resistor, the fourth end of the rectifier bridge is respectively connected to the first end of the primary side and the first end of the twenty-fifth capacitor, and the second end of the twenty-fifth capacitor is connected to the second ground.

10. An electronic device, characterized in that: It comprises a multi-output power supply circuit as described in any one of claims 1 to 9 and a plurality of loads.

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