Switch power regulation power supply circuit

Abstract

The utility model provides a switch power regulation power supply circuit. The switch power regulation power supply circuit comprises an input assembly, a control assembly, a power regulation assembly and an output assembly, the input assembly is connected with the control assembly, the power adjusting assembly and the output assembly. The power adjusting assembly is connected with the control assembly; when power regulation is carried out, the current of the input assembly is transmitted to the control assembly and the power regulation assembly. A PWM control signal of the power adjusting assembly is transmitted to the control assembly; an input control signal of the control assembly is transmitted to the input assembly; the current of the input assembly is transmitted to the output assembly. Power regulation can be realized without adding a power regulation circuit or remote control, the installation is simplified, and the use is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply circuit, in particular to a switch power supply circuit. BACKGROUND

[0002] The power supply circuit can be used for powering the lamp. When installing the line dimming lamp, it is usually necessary to lay the switch line and the dimming line respectively, which leads to inconvenient installation. At the same time, for the place without laying the dimming line, when the lamp is upgraded to have the dimming function, if the rewiring is performed, the structure of the wall, ceiling and the like will be damaged, which increases the installation cost and time cost.

[0003] Therefore, when the power needs to be adjusted, the existing power supply circuit cannot meet the dimming requirements of the lamp. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application is proposed to provide a switch power supply circuit which overcomes the above problems or at least partially solves the above problems.

[0005] The present application provides a switch power supply circuit, comprising: an input component, a control component, a power adjustment component and an output component;

[0006] The input component is connected with the control component, the power adjustment component and the output component; the power adjustment component is connected with the control component;

[0007] When the power is adjusted, the current of the input component is transmitted to the control component and the power adjustment component; the PWM control signal of the power adjustment component is transmitted to the control component; the input control signal of the control component is transmitted to the input component; the current of the input component is transmitted to the output component.

[0008] Further, the control component comprises a controller U1; the power adjustment component comprises a controller U2;

[0009] The input component is connected with the VIN pin of the controller U1 and the VDD pin of the controller U2;

[0010] The P2 pin of the controller U2 is connected with one end of a resistor R31; the other end of the resistor R31 is connected with the PWM pin of the controller U1.

[0011] Further, the input component comprises a primary side input part of a transformer T1; the output component comprises a secondary side output part of the transformer T1;

[0012] The first input end of the transformer T1 is connected with one end of the resistor R36, the other end of the resistor R36 is connected with one end of the resistor R37, the other end of the resistor R37 is connected with one end of the resistor R38, the other end of the resistor R38 is connected with the VIN pin of the controller U1 and one end of the resistor R10;

[0013] The second input end of the transformer T1 is connected with the drain of the switch tube Q1;

[0014] The third input end of the transformer T1 is connected with the VDD pin of the controller U2 and the anode of the diode D3, the cathode of the diode D3 is connected with the other end of the resistor R10;

[0015] The fourth input end of the transformer T1 is connected with the ground wire.

[0016] Further, the power regulating component includes a three-terminal voltage regulator Q2;

[0017] The vin pin of the three-terminal voltage regulator Q2 is connected with one end of the resistor R28, the other end of the resistor R28 is connected with the cathode of the diode D7, the anode of the diode D7 is connected with the third input end of the transformer T1;

[0018] The O pin of the three-terminal voltage regulator Q2 is connected with the VDD pin of the controller U2;

[0019] The G pin of the three-terminal voltage regulator Q2 is connected with the GND pin of the controller U2 and the ground wire.

[0020] Further, the vin pin of the three-terminal voltage regulator Q2 is connected with the anode of the polarized capacitor CE5;

[0021] The O pin of the three-terminal voltage regulator Q2 is connected with one end of the capacitor C13 and one end of the capacitor C8;

[0022] The G pin of the three-terminal voltage regulator Q2 is connected with the other end of the capacitor C13, the other end of the capacitor C8, one end of the capacitor C9, the cathode of the polarized capacitor CE5 and the ground wire.

[0023] Further, the CT pin of the controller U2 is connected with one end of the capacitor C9, one end of the resistor R29 and the cathode of the voltage stabilizing diode ZD1, the other end of the capacitor C9 is connected with the ground wire, the anode of the voltage stabilizing diode ZD1 is connected with the ground wire;

[0024] The other end of the resistor R29 is connected with the cathode of the diode D8, the anode of the diode D8 is connected with the third input end of the transformer T1.

[0025] Further, the control component includes a switch tube Q1;

[0026] The DRV pin of the controller U1 is connected with one end of the resistor R14 and one end of the resistor R15;

[0027] The gate of the switch tube Q1 is connected with the other end of the resistor R15, one end of the resistor R16 and the positive pole of the diode D4; the other end of the resistor R14 is connected with the negative pole of the diode D4;

[0028] The source of the switch tube Q1 is connected with one end of the capacitor C4, the other end of the resistor R16 and one end of the resistor R20; the other end of the resistor R20 is connected with the ground wire;

[0029] The drain of the switch tube Q1 is connected with the other end of the capacitor C4 and the input component.

[0030] Further, one end of the resistor R17 is connected with the ISEN pin of the controller U1; the other end of the resistor R17 is connected with the source of the switch tube Q1.

[0031] Further, one end of the capacitor C12 is connected with the DIM pin of the controller U1; the other end of the capacitor C12 is connected with one end of the capacitor C2 and the ground wire; the other end of the capacitor C2 is connected with the COM pin of the controller U1.

[0032] Further, one end of the resistor R12, one end of the capacitor C6 and one end of the resistor R19 are connected with the ZCS pin of the controller U1; the other end of the resistor R12 is connected with one end of the resistor R11; the other end of the resistor R11 is connected with the third input end of the transformer T1; the other end of the capacitor C6 is connected with the other end of the resistor R19 and the ground wire.

[0033] The application has the following advantages:

[0034] In the embodiment of the application, in order to solve the problem that the existing power supply circuit cannot meet the dimming requirements of the lamp, the application provides a solution of "realizing power regulation function at the input end of the power supply circuit through the power regulation component", specifically: the input component is connected with the control component, the power regulation component and the output component; the power regulation component is connected with the control component; when power regulation is performed, the current of the input component is transmitted to the control component and the power regulation component; the PWM control signal of the power regulation component is transmitted to the control component; the input control signal of the control component is transmitted to the input component; the current of the input component is transmitted to the output component. The switch power supply circuit of the application can realize power regulation without adding a power regulation circuit or remote control, simplifies installation and is convenient to use. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the present application, the drawings required to be used in the description of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0036] Figure 1 is a structural block diagram of a switching power supply circuit provided by an embodiment of the present application;

[0037] Figure 2 is a whole structural schematic diagram of a switching power supply circuit provided by an embodiment of the present application;

[0038] Figure 3 is a structural schematic diagram of an input component and a control component in an embodiment of the present application;

[0039] Figure 4 is a structural schematic diagram of a power regulation component in an embodiment of the present application;

[0040] Figure 5 is a structural schematic diagram of an output component in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] The inventor found through analyzing the prior art that the essential reason why the existing power supply circuit cannot meet the dimming requirements of the lamp is that the existing power supply circuit usually does not have a dimming module, and adding a dimming function on the basis of the existing power supply circuit usually needs to rewire. Based on this, one of the core technical concepts of the present application is to realize the dimming function of the lamp by controlling the AC end switch, without the need for a dimming circuit, without the need for a remote control tool, convenient to install, and can be directly connected to the original line for use to realize the dimming function, avoiding the trouble of wiring and simplifying the installation.

[0043] Reference Figure 1 , shows a switching power supply circuit provided by an embodiment of the present application, which comprises an input component, a control component, a power regulation component and an output component;

[0044] The input component is connected with the control component, the power regulation component and the output component; the power regulation component is connected with the control component;

[0045] When power regulation is performed, the current of the input component is transmitted to the control component and the power regulation component; the PWM control signal of the power regulation component is transmitted to the control component; the input control signal of the control component is transmitted to the input component; the current of the input component is transmitted to the output component.

[0046] In the embodiment of the present application, in order to solve the problem that the existing power supply circuit cannot meet the dimming requirements of the lamp, the present application provides a solution of "realizing power regulation function at the input end of the power supply circuit through the power regulation component", specifically: the input component is connected with the control component, the power regulation component and the output component; the power regulation component is connected with the control component; when power regulation is performed, the current of the input component is transmitted to the control component and the power regulation component; the PWM control signal of the power regulation component is transmitted to the control component; the input control signal of the control component is transmitted to the input component; the current of the input component is transmitted to the output component. The switch power regulation power supply circuit of the present application can realize power regulation without adding a power regulation circuit or remote control, simplifying installation and being convenient to use.

[0047] In the following, a switch power regulation power supply circuit in the present exemplary embodiment will be further described.

[0048] It should be noted that, with reference to Figure 2 , the input component can take alternating current as input current, and output current to the output component through a transformer; the input component can include a lightning surge absorption subcomponent, an EMC filter subcomponent, an input rectification filter subcomponent, a main winding peak absorption subcomponent, a primary side peak absorption subcomponent of transformer T1, a VCC power supply subcomponent; the VCC power supply subcomponent can be connected with the control component and the power regulation component to supply power to the control component and the power regulation component; the control component can include a current detection subcomponent, a voltage zero-crossing detection subcomponent and a MOS tube driving subcomponent; the power regulation component can be connected with the VCC power supply subcomponent; the output component is used to connect and output current to an electric appliance requiring power regulation, such as a dimmable lamp; the output component can include an output rectification filter subcomponent;

[0049] By switching the input component, the level change signal of the input component is transmitted to the control component and the power regulation component through current, and the MCU of the power regulation component controls the control component (flyback power supply IC) with a dimming interface according to a preset program, so as to realize power switching or dimming.

[0050] Referring to Figures 3-4 In an embodiment of the present application, the control component comprises a controller U1, and the power regulating component comprises a controller U2.

[0051] The input component is connected to a VIN pin of the controller U1 and a VDD pin of the controller U2.

[0052] A P2 pin of the controller U2 is connected to one end of a resistor R31, and the other end of the resistor R31 is connected to a PWM pin of the controller U1.

[0053] It should be noted that the model of the controller U1 can be BP3378, and the model of the controller U2 can be JZ8PE255E. The input component is connected to the VIN pin of the controller U1 and the VDD pin of the controller U2 to supply power to the controller U1 and the controller U2.

[0054] In a specific embodiment of the present application, the controller U2 can set multiple PWM control signal output gears as needed.

[0055] As an example, when adjusting a lamp, if the lamp is turned on again within a certain time after being turned off (i.e., the AC input of the input component is turned on again within a certain time after being turned off), the controller U2 outputs a PWM control signal with a set duty cycle to control the dimming interface of the controller U1 to achieve dimming. The PWM control signal can be set to change the duty cycle once for each on-off operation within 3 seconds, and the order of the change of the duty cycle of the PWM control signal can be from small to large to achieve gear shifting.

[0056] The controller U2 can set two PWM control signal output gears, and the duty cycles of the PWM control signals can be 100% and 60% respectively. If the currently turned-on lamp has a duty cycle of 60% (i.e., the current brightness is 60%), the duty cycle is switched to 100% within 3 seconds after being turned off, and the duty cycle is switched to 60% again within 3 seconds after being turned off, and the cycle can be repeated. If the lamp is turned on again after being turned off for more than 3 seconds, the PWM duty cycle can remain the same as the last on-off state to achieve on-off adjustment with memory function.

[0057] Referring to Figure 3 and Figure 5 In an embodiment of the present application, the input component comprises a primary side input part of a transformer T1, and the output component comprises a secondary side output part of the transformer T1.

[0058] The first input end of the transformer T1 is connected with one end of the resistor R36, the other end of the resistor R36 is connected with one end of the resistor R37, the other end of the resistor R37 is connected with one end of the resistor R38, the other end of the resistor R38 is connected with the VIN pin of the controller U1 and one end of the resistor R10;

[0059] The second input end of the transformer T1 is connected with the drain of the switch tube Q1;

[0060] The third input end of the transformer T1 is connected with the VDD pin of the controller U2 and the anode of the diode D3, the cathode of the diode D3 is connected with the other end of the resistor R10;

[0061] The fourth input end of the transformer T1 is connected with the ground wire.

[0062] It should be noted that the VCC power supply component includes the third input end and the fourth input end of the transformer T1, the third input end of the transformer T1 is used for sending the level change signal of the input component to the controller U1 and the controller U2, and input detection is performed to determine the switching condition of the AC end.

[0063] Referring to Figure 4 In an embodiment of the present application, the power regulation component includes a three-terminal voltage regulator Q2;

[0064] The vin pin of the three-terminal voltage regulator Q2 is connected with one end of the resistor R28, the other end of the resistor R28 is connected with the cathode of the diode D7, and the anode of the diode D7 is connected with the third input end of the transformer T1;

[0065] The O pin of the three-terminal voltage regulator Q2 is connected with the VDD pin of the controller U2;

[0066] The G pin of the three-terminal voltage regulator Q2 is connected with the GND pin of the controller U2 and the ground wire.

[0067] It should be noted that the working voltage of the three-terminal voltage regulator Q2 can be 3.3V, the model is 7133JTD, and the function is to convert the voltage to 3.3V to supply power to the controller U2.

[0068] Referring to Figure 4 In an embodiment of the present application, the vin pin of the three-terminal voltage regulator Q2 is connected with the anode of the polar capacitor CE5;

[0069] The O pin of the three-terminal voltage regulator Q2 is connected with one end of the capacitor C13 and one end of the capacitor C8;

[0070] The G pin of the three-terminal voltage regulator Q2 is connected with the other end of the capacitor C13, the other end of the capacitor C8, one end of the capacitor C9, the negative pole of the polar capacitor CE5 and the ground wire.

[0071] With reference to Figure 4 In an embodiment of the present application, the CT pin of the controller U2 is connected with one end of the capacitor C9, one end of the resistor R29 and the negative pole of the voltage regulator diode ZD1; the other end of the capacitor C9 is connected with the ground wire; the positive pole of the voltage regulator diode ZD1 is connected with the ground wire.

[0072] The other end of the resistor R29 is connected with the negative pole of the diode D8; the positive pole of the diode D8 is connected with the third input end of the transformer T1.

[0073] It should be noted that the CT pin of the controller U2 can be used to detect the power-off time to determine the PWM duty cycle (such as 60% or 100%) output by the P2 pin of the controller U2.

[0074] With reference to Figure 3 In an embodiment of the present application, the control component includes a switch tube Q1.

[0075] The DRV pin of the controller U1 is connected with one end of the resistor R14 and one end of the resistor R15;

[0076] The gate of the switch tube Q1 is connected with the other end of the resistor R15, one end of the resistor R16 and the positive pole of the diode D4; the other end of the resistor R14 is connected with the negative pole of the diode D4;

[0077] The source of the switch tube Q1 is connected with one end of the capacitor C4, the other end of the resistor R16 and one end of the resistor R20; the other end of the resistor R20 is connected with the ground wire;

[0078] The drain of the switch tube Q1 is connected with the other end of the capacitor C4 and the input component.

[0079] In an embodiment of the present application, the ISEN pin of the controller U1 is connected with one end of the resistor R17; the other end of the resistor R17 is connected with the source of the switch tube Q1.

[0080] In an embodiment of the present application, the DIM pin of the controller U1 is connected with one end of the capacitor C12; the other end of the capacitor C12 is connected with one end of the capacitor C2 and the ground wire; the other end of the capacitor C2 is connected with the COM pin of the controller U1.

[0081] In an embodiment of the present application, the ZCS pin of the controller U1 is connected with one end of the resistor R12, one end of the capacitor C6 and one end of the resistor R19; the other end of the resistor R12 is connected with one end of the resistor R11; the other end of the resistor R11 is connected with the third input end of the transformer T1; the other end of the capacitor C6 is connected with the other end of the resistor R19 and the ground wire.

[0082] In a specific embodiment of the present application, when the AC input end of the input assembly is powered on for the first time through the switch, the P2 pin of the controller U2 outputs a PWM signal with 100% duty cycle (which is the initial state set by the program). When the switch of the AC input end is turned off, the CT pin of the controller U2 quickly detects the decrease of the potential, and when the potential of the pin decreases to a set value (power-off value, because the VDD pin of the controller U2 has a large capacitor value, it can still work for a few seconds after power-off), the MCU starts timing, and if it detects power-on again within 3 seconds, it changes the PWM duty cycle output by the P2 pin of the controller U2, and at this time the duty cycle can be set to 60%, realizing switch dimming. When the switch of the AC input end is turned off again and power-on again within 3 seconds, the PWM duty cycle output by the P2 pin of the controller U2 returns to 100%. That is, as long as the switch is turned off and the light is turned on again within 3 seconds, the PWM duty cycle output by the P2 pin of the controller U2 changes in turn: 100%-60%-100%…… (which can be looped continuously). Other PWM duty cycle values or gear numbers can also be set in the controller U2 through the MCU software. If the turn-off time exceeds 3 seconds, the last duty cycle is maintained when the light is turned on, that is, the last state can be memorized.

[0083] Although the preferred embodiments of the embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the embodiments of the present application.

[0084] Finally, it is to be understood that the phraseology or terminology such as "first" and "second" etc. used herein is merely intended to differentiate one entity or operation from another entity or operation, without necessarily requiring or implying any actual such relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0085] The switch power supply circuit provided by the present application is described in detail above, and the principles and implementation manners of the present application are described by using specific examples in the present text. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In summary, the content of the present description should not be understood as a limitation of the present application.

Claims

1. A switching power supply circuit, characterized in that, include: Input components, control components, power regulation components, and output components; The input component is connected to the control component, the power regulation component, and the output component; the power regulation component is connected to the control component. When power regulation is performed, the current of the input component is transmitted to the control component and the power regulation component; the PWM control signal of the power regulation component is transmitted to the control component; the input control signal of the control component is transmitted to the input component; and the current of the input component is transmitted to the output component.

2. The switching power supply circuit according to claim 1, characterized in that, The control component includes a controller U1; the power regulation component includes a controller U2; The input component is connected to the VIN pin of the controller U1 and the VDD pin of the controller U2; The P2 pin of the controller U2 is connected to one end of the resistor R31; the other end of the resistor R31 is connected to the PWM pin of the controller U1.

3. The switching power supply circuit according to claim 2, characterized in that, The input component includes the primary input portion of transformer T1; the output component includes the secondary output portion of transformer T1. The first input terminal of the transformer T1 is connected to one end of the resistor R36, the other end of the resistor R36 is connected to one end of the resistor R37, the other end of the resistor R37 is connected to one end of the resistor R38, and the other end of the resistor R38 is connected to the VIN pin of the controller U1 and one end of the resistor R10. The second input terminal of the transformer T1 is connected to the drain of the switching transistor Q1; The third input terminal of the transformer T1 is connected to the VDD pin of the controller U2 and the positive terminal of the diode D3; the negative terminal of the diode D3 is connected to the other end of the resistor R10. The fourth input terminal of the transformer T1 is connected to the ground wire.

4. The switching power supply circuit according to claim 3, characterized in that, The power regulation component includes a three-terminal Zener diode Q2; The vin pin of the three-terminal Zener diode Q2 is connected to one end of the resistor R28; the other end of the resistor R28 is connected to the cathode of the diode D7; and the anode of the diode D7 is connected to the third input terminal of the transformer T1. The O pin of the three-terminal Zener diode Q2 is connected to the VDD pin of the controller U2; The G pin of the three-terminal Zener diode Q2 is connected to the GND pin and ground of the controller U2.

5. The switching power supply circuit according to claim 4, characterized in that, The vin pin of the three-terminal Zener diode Q2 is connected to the positive terminal of the polarized capacitor CE5; The 0 pin of the three-terminal Zener diode Q2 is connected to one end of capacitor C13 and one end of capacitor C8; The G pin of the three-terminal Zener diode Q2 is connected to the other end of capacitor C13, the other end of capacitor C8, one end of capacitor C9, the negative terminal of polarized capacitor CE5, and ground.

6. The switching power supply circuit according to claim 5, characterized in that, The CT pin of the controller U2 is connected to one end of capacitor C9, one end of resistor R29, and the negative terminal of Zener diode ZD1; the other end of capacitor C9 is connected to ground; and the positive terminal of Zener diode ZD1 is connected to ground. The other end of the resistor R29 is connected to the negative terminal of the diode D8; the positive terminal of the diode D8 is connected to the third input terminal of the transformer T1.

7. The switching power supply circuit according to claim 2, characterized in that, The control component includes a switching transistor Q1; The DRV pin of the controller U1 is connected to one end of resistor R14 and one end of resistor R15. The gate of the switch Q1 is connected to the other end of resistor R15, one end of resistor R16, and the positive terminal of diode D4; the other end of resistor R14 is connected to the negative terminal of diode D4. The source of the switching transistor Q1 is connected to one end of capacitor C4, the other end of resistor R16, and one end of resistor R20; the other end of resistor R20 is connected to ground. The drain of the switching transistor Q1 is connected to the other end of the capacitor C4 and the input component.

8. The switching power supply circuit according to claim 7, characterized in that, The ISEN pin of the controller U1 is connected to one end of the resistor R17; the other end of the resistor R17 is connected to the source of the switching transistor Q1.

9. The switching power supply circuit according to claim 7, characterized in that, The DIM pin of the controller U1 is connected to one end of the capacitor C12; the other end of the capacitor C12 is connected to one end of the capacitor C2 and the ground wire; the other end of the capacitor C2 is connected to the COM pin of the controller U1.

10. The switching power supply circuit according to claim 7, characterized in that, The ZCS pin of the controller U1 is connected to one end of resistor R12, one end of capacitor C6, and one end of resistor R19; the other end of resistor R12 is connected to one end of resistor R11; the other end of resistor R11 is connected to the third input terminal of transformer T1; and the other end of capacitor C6, the other end of resistor R19, and ground are connected.

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