Switching power supply circuit and lamp
The switching circuit structure of PNP and NPN transistors controlled by the main control chip simplifies the switching power supply circuit, reduces costs, and improves the stability of the power supply voltage, solving the problems of high cost and component failure caused by complex circuits in the prior art.
Patent Information
- Application Number
- CN202422998250.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-05
AI Technical Summary
Existing switching power supply circuits are complex to reduce power consumption, and the large number of electronic components increases the possibility of failure and increases manufacturing costs.
The circuit adopts a structure including a first switch and a second switch. The main control chip controls the second switch through a PWM modulation signal, and the second switch controls the first switch to perform switching actions. The power supply is output after being filtered by a filter circuit. The circuit structure is composed of PNP and NPN transistors and related resistors and capacitors.
This approach simplifies the structure of the switching power supply circuit, reduces costs, and improves the stability of the power supply circuit and the control accuracy of the supply voltage.
Smart Images
Figure CN223714219U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power supply technical field especially relates to a switching power supply circuit and lamps and lanterns. BACKGROUND
[0002] Switching power supply with its have high efficiency, small size etc. characteristics, can provide stable voltage, has been widely used in electronic product system. Its wide application in LED lighting, communication equipment, military equipment, scientific research equipment, industrial control equipment, power equipment, medical equipment, air purifier, refrigerator, liquid crystal display, security monitoring, computer case, digital products and instrument class etc.
[0003] At present, in some related technologies, the power consumption of switching power supply can be reduced by reducing switching frequency, reducing output voltage and the like, but the switching power supply circuit realizing these modes is relatively complex, which is not conducive to saving preparation cost. And because there are many electronic components in the circuit, the possibility of failure of the electronic components is relatively large. UTILITY MODEL CONTENT
[0004] The utility model provides a switching power supply circuit and lamps and lanterns, including first switch and second switch, main control chip output PWM modulation signal to second switch, through second switch control first switch does certain frequency switching action, first switch output power supply again through filter circuit filtering obtains the power supply of load, the switching power supply circuit of the application compares traditional switching power supply circuit, is more cost saving.
[0005] To solve the above technical problem, the utility model adopts the following technical scheme:
[0006] An aspect of the utility model embodiment provides a switching power supply circuit, the switching power supply circuit includes: first switch and second switch, the input end of first switch is connected input power supply, and the second switch is connected control first switch, main control chip, the modulation pin of main control chip is connected control second switch, and the main control chip controls first switch through second switch, filter circuit, and the output end of first switch passes through filter circuit and exports the power supply of load.
[0007] In some embodiments, the first switch includes PNP triode, the emitter of PNP triode is connected input power supply, the collector of PNP triode exports the power supply of load through filter circuit, the base of PNP triode is connected the input end of second switch, and the output end of second switch is grounded.
[0008] In some embodiments, the first switch further comprises a first resistor, one end of the first resistor being connected to the emitter of the PNP triode and an input power supply, and the other end of the first resistor being connected to the collector of the PNP triode.
[0009] In some embodiments, the second switch comprises an NPN triode and a second resistor, the collector of the NPN triode being connected to the base of the PNP triode, the base of the NPN triode being connected to a modulation pin of the master control chip, and the emitter of the NPN triode being connected to ground through the second resistor.
[0010] In some embodiments, the filter circuit comprises an inductor and a first capacitor, one end of the inductor being connected to the collector of the PNP triode and the other end of the first resistor, the other end of the inductor being connected to the positive electrode of the first capacitor, and an output power supply being output, and the negative electrode of the first capacitor being connected to ground.
[0011] In some embodiments, the filter circuit further comprises a diode, the negative electrode of the diode being connected to one end of the inductor, and the positive electrode of the diode being connected to ground.
[0012] In some embodiments, the switching power supply circuit further comprises a third resistor and a second capacitor, one end of the third resistor being connected to one end of the second capacitor and the base of the NPN triode, and the other end of the third resistor being connected to the other end of the second capacitor and the modulation pin of the master control chip.
[0013] In some embodiments, the switching power supply circuit further comprises a voltage detection circuit, the voltage detection circuit comprising a fourth resistor, a fifth resistor and a third capacitor, one end of the fourth resistor being connected to the positive electrode of the first capacitor, the other end of the fourth resistor being connected to one end of the fifth resistor, one end of the third capacitor and a voltage detection pin of the master control chip, and the other end of the fifth resistor and the other end of the third capacitor being connected to ground.
[0014] In some embodiments, the switching power supply circuit further comprises a fourth capacitor, the positive electrode of the fourth capacitor being connected to an input power supply and the emitter of the PNP triode, and the negative electrode of the fourth capacitor being connected to ground.
[0015] An aspect of an embodiment of the utility model provides a lamp, the lamp comprises the switching power supply circuit as described above.
[0016] The utility model discloses a switching power supply circuit and lamps and lanterns, at least have following beneficial effect: the application includes NPN triode and PNP triode, and the main control chip output PWM modulation signal is to the base of NPN triode to control NPN triode to do the repeated switching action, and NPN triode controls PNP triode to do the switching action of certain frequency according to PWM modulation signal, and the power supply that PNP triode exports passes through filter circuit and filters, and obtains the power supply after filtering.
[0017] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0019] Figure 1 The switching power supply circuit according to the embodiment. DETAILED DESCRIPTION
[0020] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not 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.
[0021] The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.
[0022] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements.For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.
[0023] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these example implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects of the example implementations to those skilled in the art. The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure. The drawings are not intended to be restrictive in scope. Like reference numerals in the drawings designate like parts throughout the various figures, and duplicate descriptions therefor have been omitted.
[0024] The technical solutions of the embodiments of the present application will be briefly described below:
[0025] According to some embodiments, as Figure 1 The present application provides a switching power supply circuit, which comprises:
[0026] A first switch and a second switch, an input end of the first switch is connected to an input power Vin, and the second switch is connected to control the first switch;
[0027] A main control chip, a modulation pin PWM of the main control chip is connected to control the second switch, and the main control chip controls the first switch through the second switch;
[0028] A filter circuit, an output end of the first switch outputs a power supply VCC of a load through the filter circuit.
[0029] The working principle of the above-mentioned embodiment is that the main control chip controls the second switch, the second switch controls the first switch, and the first switch controls the output of the power supply VCC.Therefore, the present application can control the second switch to make a certain frequency of switching action through the PWM modulation signal output by the modulation pin PWM of the main control chip, the second switch drives the first switch to make a certain frequency of switching action, and the size of the frequency is determined according to the PWM modulation signal.The switching power supply circuit of the present application has simple structure, and compared with the traditional switching power supply circuit, it is more cost-saving.
[0030] The following will be described in detail with reference to the drawings of the present application. Figure 1 The preferred embodiments of the present disclosure will be further described in detail.
[0031] According to some embodiments, as Figure 1As shown, the first switch comprises a PNP transistor QP, the emitter of the PNP transistor QP is connected to the input power Vin, the collector of the PNP transistor QP is connected to the power supply VCC of the load through the filter circuit, and the base of the PNP transistor QP is connected to the input end of the second switch, and the output end of the second switch is grounded.
[0032] In some embodiments, the first switch can be set as a MOS tube, a relay, a silicon controlled rectifier, an optocoupler or other electronic components with switching function, which is not limited in the application.
[0033] Further, as shown in Figure 1 The first switch further comprises a first resistor R1, one end of the first resistor R1 is connected to the emitter of the PNP transistor QP and the input power Vin, and the other end of the first resistor R1 is connected to the collector of the PNP transistor QP.
[0034] Further, as shown in Figure 1 The second switch comprises an NPN transistor QN and a second resistor R2, the collector of the NPN transistor QN is connected to the base of the PNP transistor QP, the base of the NPN transistor QN is connected to the modulation pin PWM of the main control chip, and the emitter of the NPN transistor QN is grounded through the second resistor R2.
[0035] In some embodiments, the second switch can be set as a MOS tube, a relay, a silicon controlled rectifier, an optocoupler or other electronic components with switching function, which is not limited in the application.
[0036] The working principle of the above embodiment is that, because the voltage of the input power Vin is high, the switching voltage of the selected PNP transistor QP is also high, and the chip voltage of the main control chip is generally low, so the main control chip cannot directly control the switching action of the PNP transistor QP, and therefore the NPN transistor QN is added, and the main control chip controls the switching action of the PNP transistor QP through the NPN transistor QN.
[0037] When the PWM modulation signal is high, the NPN transistor QN is turned on, the base of the PNP transistor QP receives a low-level signal through the NPN transistor QN, so the PNP transistor QP is turned on, and finally the collector of the PNP transistor QP outputs an electrical signal similar to the waveform of the PWM modulation signal, which is then filtered through the filter circuit and outputted to supply power to the load.
[0038] When the PWM modulation signal is low, the NPN transistor QN is turned off, and the base of the PNP transistor QP cannot receive a low-level signal, so the PNP transistor QP is also turned off.
[0039] According to some embodiments, as shown inFigure 1 As shown in FIG. 1, the filter circuit includes an inductor L and a first capacitor C1, one end of the inductor L is connected to the collector of the PNP transistor QP and the other end of the first resistor R1, the other end of the inductor L is connected to the positive electrode of the first capacitor C1, and the filter circuit outputs the power supply VCC, and the negative electrode of the first capacitor C1 is grounded. The filter circuit is used to filter the power supply VCC for the load.
[0040] Further, as shown in FIG. 1, the filter circuit further includes a diode D, the negative electrode of the diode D is connected to one end of the inductor L, and the positive electrode of the diode D is grounded. Figure 1
[0041] When the PWM modulation signal changes from high level to low level, the NPN transistor QN is cut off, the base of the PNP transistor QP cannot receive the low level signal, so the PNP transistor QP is also cut off, and the inductor L in the filter circuit continues to flow through the diode D.
[0042] According to some embodiments, as shown in FIG. 1, the switching power supply circuit further includes a third resistor R3 and a second capacitor C2, one end of the third resistor R3 is connected to one end of the second capacitor C2 and the base of the NPN transistor QN, the other end of the third resistor R3 is connected to the other end of the second capacitor C2 and the modulation pin PWM of the main control chip. Figure 1
[0043] According to some embodiments, as shown in FIG. 1, the switching power supply circuit further includes a voltage detection circuit, the voltage detection circuit includes a fourth resistor R4, a fifth resistor R5 and a third capacitor C3, one end of the fourth resistor R4 is connected to the positive electrode of the first capacitor C1, the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, one end of the third capacitor C3 and the voltage detection pin V_PWR of the main control chip, and the other end of the fifth resistor R5 and the other end of the third capacitor C3 are grounded. Figure 1
[0044] Among them, the fourth resistor R4 and the fifth resistor R5 are used to divide the power supply VCC, and then output to the voltage detection pin V_PWR of the main control chip after filtering through the third capacitor C3. The main control chip can detect the voltage of the load power supply VCC in real time through the voltage detection pin V_PWR. When the voltage of the load power supply VCC is too high or too low, the main control chip can adjust the output value of the power supply voltage through the PWM modulation signal, so that the power supply voltage of the load is always stable within a certain range.
[0045] According to some embodiments, as shown in FIG. 1, the switching power supply circuit further includes a fourth capacitor C4, the positive electrode of the fourth capacitor C4 is connected to the input power Vin and the emitter of the PNP transistor QP, and the negative electrode of the fourth capacitor C4 is grounded. The fourth capacitor C4 is used to filter the input power Vin. Figure 1
[0046] In some specific embodiments, the present application provides a lamp, which comprises the switching power supply circuit as above.
[0047] In some other embodiments, the switching power supply circuit of the present application can also be used in the fields of LED lighting, communication equipment, military equipment, scientific research equipment, industrial control equipment, power equipment, medical equipment, air purifiers, refrigerators, liquid crystal displays, security monitoring, computer cases, digital products and instruments, etc.
[0048] In the description of the above-mentioned embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.
[0049] Although the present disclosure has been described with reference to several exemplary embodiments, it is understood that the words that have been used are words of description and illustration, rather than words of limitation. Since the present disclosure can be embodied in many different forms without departing from the spirit or essential characteristics thereof, it is understood that the embodiments are to be considered in a descriptive sense only. In addition, the above-mentioned embodiments are not intended to limit the present disclosure, but to enable the concept of the same to those skilled in the art. Therefore, the scope of the appended claims should be construed as encompassing all changes and modifications that fall within the spirit and scope of the present disclosure, and their equivalents.
Claims
1. A switching power supply circuit, characterized in that, The switching power supply circuit includes: A first switch and a second switch, wherein the input terminal of the first switch is connected to the input power supply, and the second switch is connected to control the first switch; The main control chip has a modulation pin connected to control the second switch, and the main control chip controls the first switch through the second switch; The filter circuit provides power to the load through the output of the first switch.
2. The switching power supply circuit according to claim 1, characterized in that, The first switch includes a PNP transistor, the emitter of which is connected to the input power supply, the collector of which outputs the power supply to the load through the filter circuit, the base of which is connected to the input terminal of the second switch, and the output terminal of the second switch is grounded.
3. The switching power supply circuit according to claim 2, characterized in that, The first switch further includes a first resistor, one end of which is connected to the emitter of the PNP transistor and the input power supply, and the other end of which is connected to the collector of the PNP transistor.
4. The switching power supply circuit according to claim 2, characterized in that, The second switch includes an NPN transistor and a second resistor. The collector of the NPN transistor is connected to the base of the PNP transistor, the base of the NPN transistor is connected to the modulation pin of the main control chip, and the emitter of the NPN transistor is grounded through the second resistor.
5. The switching power supply circuit according to claim 3, characterized in that, The filter circuit includes an inductor and a first capacitor. One end of the inductor is connected to the collector of the PNP transistor and the other end of the first resistor. The other end of the inductor is connected to the positive terminal of the first capacitor and outputs power supply. The negative terminal of the first capacitor is grounded.
6. The switching power supply circuit according to claim 5, characterized in that, The filter circuit also includes a diode, the negative terminal of which is connected to one end of the inductor, and the positive terminal of which is grounded.
7. The switching power supply circuit according to claim 4, characterized in that, The switching power supply circuit also includes a third resistor and a second capacitor. One end of the third resistor is connected to one end of the second capacitor and the base of the NPN transistor, and the other end of the third resistor is connected to the other end of the second capacitor and the modulation pin of the main control chip.
8. The switching power supply circuit according to claim 5, characterized in that, The switching power supply circuit further includes a voltage detection circuit, which includes a fourth resistor, a fifth resistor, and a third capacitor. One end of the fourth resistor is connected to the positive terminal of the first capacitor, and the other end of the fourth resistor is connected to one end of the fifth resistor, one end of the third capacitor, and the voltage detection pin of the main control chip. The other end of the fifth resistor and the other end of the third capacitor are grounded.
9. The switching power supply circuit according to claim 1, characterized in that, The switching power supply circuit also includes a fourth capacitor, the positive terminal of which is connected to the input power supply and the emitter of the PNP transistor, and the negative terminal of which is grounded.
10. A lamp, characterized in that, The luminaire includes a switching power supply circuit as described in any one of claims 1 to 9.