Power supply circuit and integrated circuit

Abstract

The utility model provides a power supply circuit and an integrated circuit. The power supply circuit comprises a first energy storage device, a second energy storage device, a voltage stabilizing device, a rectifier device, a capacitor and a current limiting device. The positive electrode of a power supply is connected with a power supply pin of an integrated chip through the first energy storage device, the capacitor, the current limiting device and the rectifier device; the positive pole of a power supply is connected with the negative pole of the power supply through the first energy storage device, the capacitor, the current limiting device and the rectifier device; the positive electrode of a power supply is connected with the negative electrode of the power supply through the first energy storage device, the capacitor, the current limiting device and the voltage stabilizing device. The integrated circuit comprises a power supply circuit, and a power supply, the rectification circuit, the power supply circuit and the integrated chip are connected in sequence. According to the utility model, the size of the power supply circuit can be reduced, and the cost can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply circuits, and in particular relates to a power supply circuit and an integrated circuit. Background Art

[0002] In the dimming power supply products of the prior art, in order to provide a stable and sufficient power supply to the VCC pin of the integrated chip, a separate constant voltage source or a transformer auxiliary winding is generally used. The purpose is to allow the dimming power supply to provide a stable power supply system to the VCC pin of the integrated circuit in the state of minimum brightness or when the mains voltage fluctuates greatly, to ensure that the power supply will not have abnormal working conditions such as flashing, light jitter or failure to start. The above power supply method has two disadvantages: 1. The circuit is complex, the power consumption is high, and the power supply volume is occupied, which is not conducive to product miniaturization; 2. The cost is high, so that the price of the overall product cannot be reduced, which is not conducive to improving the market competitiveness of the product. Utility Model Content

[0003] In order to overcome the above technical defects, the utility model provides a module and a lamp integrating a light source load and a driving power supply, which have a simple structure.

[0004] The utility model is realized by the following scheme:

[0005] A power supply circuit is applied to an integrated circuit, the integrated circuit is provided with an integrated chip, and the power supply circuit comprises: a first energy storage device, a second energy storage device, a voltage stabilizing device, a rectifying device, a capacitor and a current limiting device;

[0006] The positive electrode of the power supply is connected to the power pin of the integrated chip through the first energy storage device, the capacitor, the current limiting device, and the rectifying device;

[0007] The positive electrode of the power supply is connected to the negative electrode of the power supply through the first energy storage device, the capacitor, the current limiting device, and the rectifying device;

[0008] The positive electrode of the power supply is connected to the negative electrode of the power supply through the first energy storage device, the capacitor, the current limiting device, and the voltage stabilizing device.

[0009] As a further improvement of the present invention, the first energy storage device is an inductor.

[0010] As a further improvement of the present invention, the second energy storage device is a capacitor.

[0011] As a further improvement of the utility model, the voltage stabilizing device is a voltage stabilizing diode.

[0012] As a further improvement of the present invention, the rectifying device is a diode.

[0013] As a further improvement of the present invention, the current limiting device is a resistor.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the first energy storage device and the second energy storage device are used to power the integrated chip, and even when the dimming power supply is under light load or the input fluctuation is large, there will be no problem of insufficient power, and the use of auxiliary windings can be avoided, which can reduce the volume of the power supply circuit and reduce the cost at the same time; in addition, voltage stabilizing devices and rectifier devices are provided to ensure the stability of power supply.

[0015] In addition, the utility model also provides an integrated circuit, including: an integrated chip, a rectifier circuit and the above-mentioned power supply circuit, the integrated chip is also connected to a switch branch, the power supply, the rectifier circuit, the power supply circuit, and the integrated chip are connected in sequence.

[0016] As a further improvement of the present invention, the switch branch includes: a switch device, a third resistor, and a fourth resistor. The first energy storage device is connected to the drain of the switch device, the source of the switch device is connected to the negative electrode of the power supply through the third resistor, and the gate of the switch device is connected to the pin of the integrated chip through the fourth resistor.

[0017] As a further improvement of the present invention, the rectifier circuit is a rectifier bridge.

[0018] As a further improvement of the utility model, the utility model further includes: a second diode, a fifth resistor, a sixth resistor and a fourth capacitor;

[0019] The first energy storage device is connected to the positive electrode of the load through the second diode;

[0020] The first energy storage device is connected to the negative electrode of the power supply through the fifth resistor and the sixth resistor;

[0021] The first energy storage device is connected to the negative electrode of the load and the negative electrode of the power supply through the fourth capacitor.

[0022] Compared with the prior art, the beneficial effects of the present invention are: using a simpler power supply circuit to power the integrated circuit can reduce the volume and cost of the entire integrated circuit, thereby providing product price competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the power supply circuit described in Example 1;

[0025] Figure 2This is a current effect diagram when the gate of the MOS tube in the integrated circuit described in Example 2 is in Ton;

[0026] Figure 3 This is a current effect diagram when the gate of the MOS tube Q1 in the integrated circuit described in Example 2 is at Toff.

[0027] Figure numerals: 1. power supply circuit; 2. switch branch; 3. rectifier circuit. DETAILED DESCRIPTION

[0028] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0029] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0030] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0031] The utility model provides a power supply circuit, such as Figure 1As shown, it is applied to an integrated circuit, the integrated circuit is provided with an integrated chip, and the power supply circuit 1 includes: a first energy storage device T1, a second energy storage device C2, a voltage stabilizing device ZD1, a rectifying device D1, a capacitor C1 and a current limiting device R1; the positive electrode of the power supply is connected to the power pin of the integrated chip through the first energy storage device T1, the capacitor C1, the current limiting device R1, and the rectifying device D1; the positive electrode of the power supply is connected to the negative electrode of the power supply through the first energy storage device T1, the capacitor C1, the current limiting device R1, and the rectifying device D1; the positive electrode of the power supply is connected to the negative electrode of the power supply through the first energy storage device T1, the capacitor C1, the current limiting device R1, and the voltage stabilizing device ZD1.

[0032] As one implementation manner, the first energy storage device T1 is an inductor.

[0033] As one implementation manner, the second energy storage device C2 is a capacitor.

[0034] As one implementation manner, the voltage stabilizing device ZD1 is a voltage stabilizing diode.

[0035] As one implementation manner, the rectifier device D1 is a diode.

[0036] As one implementation manner, the current limiter R1 is a resistor.

[0037] The utility model adopts a first energy storage device and a second energy storage device to power the integrated chip. The first energy storage device is used as a power inductor. When the dimming power supply is under light load or the input fluctuation is large, there will be no problem of insufficient power. The use of auxiliary windings can be avoided, the volume of the power supply circuit can be reduced, and the cost can be reduced at the same time. In addition, a voltage stabilizing device and a rectifying device are provided to ensure the stability of the power supply.

[0038] The utility model also provides an integrated circuit, such as Figure 1 As shown, it includes: an integrated chip U1, a rectifier circuit and the aforementioned power supply circuit 1, the integrated chip U1 is also connected to a switch branch 2, and the power supply, the rectifier circuit, the power supply circuit 1 and the integrated chip U1 are connected in sequence.

[0039] Further, the switch branch 2 includes: a switch device Q1, a third resistor R3, and a fourth resistor R4, the first energy storage device T1 is connected to the drain of the switch device Q1, the source of the switch device Q1 is connected to the negative electrode of the power supply through the third resistor R3, the gate of the switch device Q1 is connected to the GATE pin of the integrated chip U1 through the fourth resistor R4, and the third resistor R3 is also used as a current limiting device. The switch device Q1 can be implemented by a MOS tube.

[0040] Preferably, the rectifier circuit comprises: a fuse F1 and a rectifier bridge BD connected in series, and the positive output end of the rectifier bridge BD is connected to the first energy storage device T1.

[0041] In addition, the utility model also includes: a second diode D2, a fifth resistor R5, a sixth resistor R6 and a fourth capacitor C4; the first energy storage device T1 is connected to the positive electrode of the load through the second diode D2; the first energy storage device T1 is connected to the negative electrode of the power supply through the fifth resistor R5 and the sixth resistor R6; the first energy storage device T1 is connected to the negative electrode of the load and the negative electrode of the power supply through the fourth capacitor C4.

[0042] Next, this embodiment is further explained in conjunction with the specific implementation process, as follows:

[0043] The first energy storage device T1 serves as a main power inductor to supply power to the rear-end load, and also supplies power to the VCC pin of the integrated chip U1 after voltage stabilization through the voltage stabilizing device ZD1, the rectifying device D1, the capacitor C1 and the current limiting device R1.

[0044] When the gate of the MOS tube Q1 is at Ton, the MOS tube Q1 is turned on, and the power supply stores energy in the first energy storage device T1 and the second energy storage device C2. At this time, the potential of the first energy storage device T1 is V1>V2, the potential of the capacitor C1 is V3>V4, and V2=V3, then V1>V4, the current limiting device resistor R1 and the third resistor R3 play a current limiting protection role, the voltage stabilizing device ZD1 is forward-conducted, the rectifying device D1 is reverse-cut off, and the second energy storage device C2 releases electric energy, and the VCC pin of the integrated chip U1 supplies power to the entire integrated circuit. Figure 2 shown.

[0045] When the gate of the MOS tube Q1 is at Toff, the power supply (i.e., the mains) continues to supply power; the MOS tube Q1 is turned off, and the first energy storage device T1 releases electric energy. Since the inductor circuit cannot change suddenly, the polarity of the potential of the first energy storage device T1 is instantly opposite, i.e., V2>V1, and the potential of V2 is instantly raised, while the voltage across the capacitor C1 cannot change suddenly, i.e., the potential of V4 is synchronously and instantly raised; at this time, the current limiting device resistor R1 plays a current limiting protection role, the voltage stabilizing device ZD1 is reversely cut off, and the rectifier device D1 is forwardly turned on, and the electric energy is used to store electric energy in the second energy storage device C2 and to supply power to the VCC pin of the integrated chip U1. The circuit loop and current effect diagram are shown in the figure below. Figure 3 shown.

[0046] In summary, the utility model has the following technical effects:

[0047] 1. The first energy storage device T1 and the second energy storage device C2 have strong energy storage capacity. Since the first energy storage device T1 is the power inductor of the main circuit, the stored electric energy can enable the entire power supply to work normally, and the power supply to the VCC pin of the integrated chip U1 is obtained from the first energy storage device T1. Even if the dimming power supply is under light load or the input fluctuation is large, there is no need to worry about insufficient electric energy, and the auxiliary winding is omitted, which is beneficial to reducing the volume and cost of the first energy storage device T1.

[0048] 2. The first energy storage device ZD1 plays a voltage stabilizing role when the gate of the switching device Q1 is at Ton, and plays a forward conduction role at Toff. At this time, the rectifier device D1 is reversely cut off and plays an isolation role, so that the power supply circuit is complete in the entire cycle circuit loop and continuously supplies power to the VCC pin of the integrated chip U1 to ensure stable power supply. At the same time, the voltage stabilizing parameters of the voltage stabilizing device ZD1 and the parameters of the second energy storage device C2 can be adjusted to adapt to the power supply voltage and power supply energy required by different integrated circuits.

[0049] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: Applied to an integrated circuit, the integrated circuit is provided with an integrated chip, the power supply circuit comprises: a first energy storage device, a second energy storage device, a voltage stabilizing device, a rectifying device, a capacitor and a current limiting device; The positive electrode of the power supply is connected to the power pin of the integrated chip through the first energy storage device, the capacitor, the current limiting device, and the rectifying device; The positive electrode of the power supply is connected to the negative electrode of the power supply through the first energy storage device, the capacitor, the current limiting device, and the rectifying device; The positive electrode of the power supply is connected to the negative electrode of the power supply through the first energy storage device, the capacitor, the current limiting device, and the voltage stabilizing device.

2. The power supply circuit according to claim 1, characterized in that: The first energy storage device is an inductor.

3. The power supply circuit according to claim 1, characterized in that: The second energy storage device is a capacitor.

4. The power supply circuit according to claim 1, characterized in that: The voltage stabilizing device is a voltage stabilizing diode.

5. The power supply circuit according to claim 1, characterized in that: The rectifying device is a diode.

6. The power supply circuit according to claim 1, characterized in that: The current limiting device is a resistor.

7. An integrated circuit, characterized in that: include: An integrated chip, a rectifier circuit, and a power supply circuit as described in any one of claims 1 to 6, wherein the integrated chip is also connected to a switch branch, and the power supply, the rectifier circuit, the power supply circuit, and the integrated chip are connected in sequence.

8. The integrated circuit according to claim 7, characterized in that The switch branch includes: a switch device, a third resistor, and a fourth resistor. The first energy storage device is connected to the drain of the switch device, the source of the switch device is connected to the negative electrode of the power supply through the third resistor, and the gate of the switch device is connected to the pin of the integrated chip through the fourth resistor.

9. The integrated circuit according to claim 7, characterized in that: The rectifier circuit comprises: a fuse and a rectifier bridge connected in series.

10. The integrated circuit according to claim 7, characterized in that Also includes: a second diode, a fifth resistor, a sixth resistor and a fourth capacitor; The first energy storage device is connected to the positive electrode of the load through the second diode; The first energy storage device is connected to the negative electrode of the power supply through the fifth resistor and the sixth resistor; The first energy storage device is connected to the negative electrode of the load and the negative electrode of the power supply through the fourth capacitor.

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