CN216721166U - Buck power supply circuit and household electrical appliances - Google Patents
Buck power supply circuit and household electrical appliances Download PDFInfo
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- CN216721166U CN216721166U CN202122497624.7U CN202122497624U CN216721166U CN 216721166 U CN216721166 U CN 216721166U CN 202122497624 U CN202122497624 U CN 202122497624U CN 216721166 U CN216721166 U CN 216721166U
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Abstract
The utility model discloses a buck power circuit and household electrical appliance equipment, and relates to the technical field of protection circuits, wherein the buck power circuit comprises: the input overvoltage protection module comprises a voltage division circuit, a comparator and a switch device; one end of the voltage division circuit is connected with the input power supply module, and the other end of the voltage division circuit is connected with the positive phase end of the comparator; the negative phase end of the comparator is connected with a reference power supply, the output end of the comparator is connected with the input end of the switching device, and the output end of the switching device is connected with the feedback pin of the buck power supply chip. The utility model can trigger the voltage protection function of the buck power chip when the voltage of the input power supply is higher, thereby realizing the input overvoltage protection of the buck power chip and reducing the fault rate of the buck power chip.
Description
Technical Field
The utility model relates to the technical field of protection circuits, in particular to a buck power circuit and household electrical appliance.
Background
The conventional buck power supply chip has limited protection function, only has output overvoltage protection, and does not have input overvoltage protection. When a buck power chip is used in a circuit of the household electrical equipment, if the household electrical equipment is subjected to high voltage caused by external power grid abnormity or lightning stroke, faults are easy to occur, and the fault rate is high.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a buck power circuit and a household appliance, which can trigger the voltage protection function of a buck power chip when the voltage of an input power supply is higher, realize the input overvoltage protection of the buck power chip and reduce the fault rate of the buck power chip.
According to an embodiment of the present invention, in one aspect, there is provided a buck power circuit, including: the input overvoltage protection module comprises a voltage division circuit, a comparator and a switch device; one end of the voltage division circuit is connected with the input power supply module, and the other end of the voltage division circuit is connected with the positive phase end of the comparator; the negative phase end of the comparator is connected with a reference power supply, the output end of the comparator is connected with the input end of the switching device, and the output end of the switching device is connected with the feedback pin of the buck power chip.
By adopting the technical scheme, when the input power supply is higher than the voltage of the reference power supply, the comparator outputs high level to conduct the switch device, so that the voltage of the feedback pin of the buck power supply chip is increased, the voltage protection function of the buck power supply chip is triggered, the input overvoltage protection of the buck power supply chip is realized, and the fault rate of the buck power supply chip is reduced.
Preferably, the voltage dividing circuit includes a first voltage-reducing element and a second voltage-reducing element, one end of the first voltage-reducing element is connected to the input power module, the other end of the first voltage-reducing element is connected to one end of the second voltage-reducing element, and the other end of the second voltage-reducing element is grounded; the positive phase end of the comparator is connected between the first voltage reduction element and the second voltage reduction element.
By adopting the technical scheme, the voltage division circuit is arranged between the input power supply module and the comparator, so that the high voltage of the input power supply module can be reduced to be low voltage, the comparator is prevented from being damaged, and the normal work of the input overvoltage protection module is ensured.
Preferably, the input overvoltage protection module further includes a first filter circuit, and the first filter circuit is disposed between the voltage dividing circuit and the positive phase terminal of the comparator.
By adopting the technical scheme, the filter circuit is arranged between the voltage division circuit and the comparator, so that the alternating current component in the direct current voltage can be reduced as much as possible, the direct current component is reserved, and the voltage comparison accuracy of the comparator during voltage protection is improved.
Preferably, the first filter circuit includes a third voltage-reducing element and a first capacitor; one end of the third voltage reduction element is connected between the first voltage reduction element and the second voltage reduction element, and the other end of the third voltage reduction element is connected with the non-inverting end of the comparator; one end of the first capacitor is connected between the third voltage reduction element and the positive phase end of the comparator, and the other end of the first capacitor is grounded.
By adopting the technical scheme, the filter network consisting of the third voltage reduction element and the first capacitor is arranged, so that the direct current after voltage division can be filtered, the filtered voltage is input to the positive phase end of the comparator, and the working accuracy of the comparator is ensured.
Preferably, the input overvoltage protection module further includes a fourth voltage-reducing element and a fifth voltage-reducing element, one end of the fourth voltage-reducing element is connected to the reference power supply, the other end of the fourth voltage-reducing element is connected to one end of the fifth voltage-reducing element, the other end of the fifth voltage-reducing element is grounded, and a negative phase terminal of the comparator is connected between the fourth voltage-reducing element and the fifth voltage-reducing element.
By adopting the technical scheme, the fourth voltage reduction element and the fifth voltage reduction element are arranged between the reference power supply and the negative phase end of the comparator, so that different reference voltage values can be input to the negative phase end of the comparator according to the voltage protection point of the buck power supply chip.
Preferably, the input overvoltage protection module further comprises: a second filter circuit including a sixth voltage-dropping element and a second capacitor; one end of the sixth voltage reduction element is connected with the output end of the comparator, and the other end of the sixth voltage reduction element is connected with the input end of the switching device; one end of the second capacitor is connected between the sixth voltage reduction element and the switching device, and the other end of the second capacitor is grounded.
By adopting the technical scheme, the second filter circuit is arranged, and the direct current input into the buck power supply chip can be further filtered.
Preferably, the input overvoltage protection module further includes a seventh voltage-reducing element, one end of the seventh voltage-reducing element is connected to the power supply, and the other end of the seventh voltage-reducing element is connected between the output end of the comparator and the sixth voltage-reducing element.
By adopting the technical scheme, the resistor is pulled up at the output end of the comparator, so that the comparator can normally output high level when the input voltage of the positive phase end of the comparator is greater than the input voltage of the negative phase end, and the normal work of the comparator is ensured.
Preferably, the switching device is a diode, an anode of the diode is connected to the sixth voltage-reducing element, and a cathode of the diode is connected to a feedback pin of the buck power chip.
By adopting the technical scheme, the diode is additionally arranged between the comparator and the feedback pin FB of the buck power chip, so that the voltage of the FB pin can be prevented from being pulled down when the buck power chip works normally, and error protection is avoided.
Preferably, the buck power circuit further comprises a rectifier bridge and an electrolytic capacitor, wherein an input end of the rectifier bridge is connected with an alternating current power supply, an output end of the rectifier bridge is connected with the electrolytic capacitor, and an anode of the electrolytic capacitor is connected with the voltage dividing circuit.
By adopting the technical scheme, the rectifier bridge and the electrolytic capacitor are arranged, alternating current can be converted into direct current, energy is stored in the electrolytic capacitor, and normal work of the buck power circuit is guaranteed.
According to an embodiment of the present invention, on the other hand, a home appliance is provided, which includes a buck power chip and the buck power circuit of any one of the first aspect.
The utility model has the following beneficial effects: through being connected to the positive phase end of comparator with input power, can make comparator output high level in order to switch on the switching device when input power is higher than the voltage of reference power, and then make buck power chip's feedback pin's voltage rising, trigger buck power chip's voltage protection function, realized the input overvoltage protection to buck power chip, reduced buck power chip's fault rate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a circuit diagram of a conventional buck power supply according to the present invention;
fig. 2 is a circuit diagram of a buck power supply provided by the present invention.
Reference numerals are as follows:
BG 1-rectifier bridge; e1, E10 and E11-electrolytic capacitors; u9-buck power chips; r130, R140 and R135-resistors; l2-inductance; c71 and C75-capacitors; d17 and D25-diodes; U3B-comparator; d1-switching device; r1 — first voltage dropping element; r2 — second voltage dropping element; r3-a third voltage reducing element; c1 — first capacitance; r4-fourth voltage dropping element; r5-fifth voltage dropping element; r6-sixth voltage dropping element; c2 — second capacitance; r7-seventh voltage dropping element.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the utility model will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the utility model and that it is not intended to limit the utility model to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to the conventional buck power circuit shown in fig. 1, the conventional buck power circuit mainly functions to step down a high-voltage dc voltage rectified by a rectifier bridge from an ac input voltage to a lower voltage, so as to provide a control power supply for a control system of a home appliance. The conventional buck power circuit comprises a rectifier bridge BG1, an electrolytic capacitor E1, a buck power chip U9, a resistor R130, a capacitor C71, a resistor R135, a resistor R140, an inductor L2, a capacitor C75, diodes D17 and D25 and electrolytic capacitors E10 and E11. The electrolytic capacitor E1 is used for energy storage and voltage regulation. MOS (metal oxide semiconductor) tubes and a control circuit are arranged in the BUCK power chip U9, and the MOS tubes, the inductor L2 and the diode D25 form a traditional BUCK voltage reduction topology.
As shown in fig. 1, the conventional buck power circuit rectifies an alternating current 220V voltage into a direct current through a rectifier bridge BG1, and converts a high-voltage direct current on an electrolytic capacitor E1 into a direct current with a lower voltage through the intermittent on and off of a MOS built in a buck power chip U9, so as to supply power to a subsequent load. Diode D17 and voltage E9 produce a floating voltage equal to the output voltage, which is referenced to ground at chip GND. The resistor R130 and the capacitor C71 are connected to VCC of the buck power chip U9 and used for supplying power to the inside of the buck power chip. The resistor R135 and the resistor R140 form a voltage dividing resistor for providing feedback voltage for the chip and adjusting the output voltage of the chip.
The present embodiment provides a buck power circuit, which is an improvement of the existing buck power circuit, and is shown in fig. 2, and the buck power circuit mainly includes an input overvoltage protection module 11, which includes a voltage dividing circuit, a comparator U3B and a switching device D1.
The voltage divider circuit includes a first voltage-reducing element R1 and a second voltage-reducing element R2, as shown in fig. 2, one end of the voltage divider circuit is connected to the input power module, and the other end of the voltage divider circuit is connected to the non-inverting terminal + of the comparator U3B. The input power supply module comprises an alternating current power supply, a rectifier bridge BG1 and an electrolytic capacitor E1, alternating current is rectified into direct current through the rectifier bridge BG1, one end of a voltage division circuit is connected with the anode of the electrolytic capacitor E1, and the buck power supply chip U9 is prevented from being damaged when voltage is too high.
The negative phase end-of the comparator U3B is connected with +3.3V of the reference power supply, the output end of the comparator U3B is connected with the input end of the switching device D1, and the output end of the switching device D1 is connected with the feedback pin FB (FeedBack) of the buck power supply chip U9.
The voltage across the electrolytic capacitor E1 is dependent on the input ac supply voltage VIN by VE 1-1.414 VIN. The voltage divider circuit reduces the voltage VE1 across the electrolytic capacitor E1 to a lower voltage, and then inputs the voltage to the positive terminal + of the comparator, and the negative terminal-of the comparator is used to set a reference voltage, and when the positive terminal + input voltage of the comparator is less than the reference voltage of the negative terminal-, the comparator outputs a low level, and the switching device D1 is in an off state.
When the positive phase end + input voltage of the comparator is greater than the negative phase end-reference voltage, the comparator outputs a high level, at this time, 3.3V, the switching device D1 is turned on, because the switching device D1 is connected to the FB pin of the buck power chip U9, when the switching device D1 is turned on, the voltage of the FB pin is raised to 3.3V, which exceeds the FB pin output protection voltage protection point by 2.9V, and the buck power chip U9 turns off the switch of the built-in MOS in response to the voltage protection function, thereby realizing the input overvoltage protection function of the buck power chip.
According to the buck power circuit provided by the embodiment, the input power supply is connected to the positive phase end of the comparator, when the input power supply is higher than the voltage of the reference power supply, the comparator outputs a high level to conduct the switch device, the voltage of the feedback pin of the buck power chip is increased, the voltage protection function of the buck power chip is triggered, the input overvoltage protection of the buck power chip is realized, and the failure rate of the buck power chip is reduced.
As shown in fig. 2, the voltage divider circuit includes a first voltage-dropping element R1 and a second voltage-dropping element R2, one end of the first voltage-dropping element R1 is connected to the input power supply module, the other end of the first voltage-dropping element R1 is connected to one end of the second voltage-dropping element R2, and the other end of the second voltage-dropping element R2 is grounded; the non-inverting terminal of the comparator is connected between the first voltage-dropping element R1 and the second voltage-dropping element R2.
Through set up bleeder circuit between input power module and comparator, can reduce the high voltage of input power module to low-voltage, prevent to damage the comparator, guaranteed the normal work of input overvoltage protection module.
In an embodiment, the buck power circuit further includes a first filter circuit, and the first filter circuit is disposed between the voltage divider circuit and the positive phase terminal of the comparator. By arranging the filter circuit between the voltage division circuit and the comparator, the alternating current component in the direct current voltage can be reduced as much as possible, the direct current component is reserved, and the voltage comparison accuracy of the comparator during voltage protection is improved.
As shown in fig. 2, the first filter circuit includes a third voltage-reducing element R3 and a first capacitor C1; one end of the third voltage reduction element R3 is connected between the first voltage reduction element R1 and the second voltage reduction element R2, and the other end of the third voltage reduction element R3 is connected to the non-inverting terminal + of the comparator U3B; one end of the first capacitor C1 is connected between the third voltage-dropping element R3 and the non-inverting terminal + of the comparator U3B, and the other end of the first capacitor C1 is grounded to GND. A filter network can be formed by arranging the third voltage reduction element and the first capacitor, and the direct current after voltage division is filtered, so that the filtered voltage is input to the positive phase end of the comparator, and the working accuracy of the comparator is ensured.
As shown in fig. 2, the input overvoltage protection module further includes a fourth voltage-reducing element R4 and a fifth voltage-reducing element R5, one end of the fourth voltage-reducing element R4 is connected to +3.3V of the reference power supply, the other end of the fourth voltage-reducing element R4 is connected to one end of the fifth voltage-reducing element R5, one end of the fifth voltage-reducing element R5 is connected to the fourth voltage-reducing element R4, the other end of the fifth voltage-reducing element R5 is grounded, and the negative phase terminal-of the comparator U3B is connected between the fourth voltage-reducing element R4 and the fifth voltage-reducing element R5.
The fourth voltage reduction element R4 and the fifth voltage reduction element R5 are used for setting a reference voltage of the negative phase input terminal of the comparator, and when the fourth voltage reduction element R4 and the fifth voltage reduction element R5 are respectively set to different resistance values, different reference voltage values can be input to the negative phase terminal of the comparator according to the voltage protection point of the buck power chip.
In one embodiment, the input overvoltage protection module further includes: a second filter circuit, as shown in fig. 2, including a sixth voltage-reducing element R6 and a second capacitor C2; one end of the sixth voltage reduction element R6 is connected to the output end of the comparator U3B, and the other end of the sixth voltage reduction element R6 is connected to the input end of the switching device D1; one end of the second capacitor C2 is connected between the sixth voltage-reducing element R6 and the switching device D1, and the other end of the second capacitor C2 is grounded.
As shown in fig. 2, the input overvoltage protection module further includes a seventh voltage-reducing element R7, one end of the seventh voltage-reducing element R7 is connected to the +3.3V power supply, and the other end of the seventh voltage-reducing element R7 is connected between the output end of the comparator U3B and the sixth voltage-reducing element R6. By pulling up the resistor at the output end of the comparator, the comparator can be ensured to normally output high level when the input voltage of the positive phase end of the comparator is greater than the input voltage of the negative phase end, and the normal work of the comparator is ensured.
In one embodiment, the switching device is a diode, and as shown in fig. 2, an anode of the diode is connected to the sixth voltage-reducing element R6, and a cathode of the diode is connected to the feedback pin FB of the buck power chip. By adding the diode between the comparator and the feedback pin FB of the buck power supply chip, the voltage of the FB pin can be prevented from being lowered when the buck power supply chip works normally, and error protection is avoided.
In practical applications, each of the voltage dropping elements may be a resistor.
According to the buck power supply circuit provided by the embodiment, the input overvoltage is monitored through the simple comparator circuit, the output overvoltage protection function of the buck power supply chip is used for protecting the chip, when the overvoltage is input, the buck power supply chip can be closed in time, the irreversible fault problems such as chip burnout caused by continuous work are avoided, and the fault occurrence rate of the buck power supply chip is reduced.
Corresponding to the buck power circuit provided by the embodiment, the embodiment of the utility model provides a household appliance, which comprises a buck power chip and the buck power circuit provided by the embodiment, so that overvoltage protection is performed on the input voltage of the buck power chip in the household appliance.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected by one skilled in the art without departing from the spirit and scope of the utility model, as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation 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 may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. A buck power circuit, comprising: the input overvoltage protection module comprises a voltage division circuit, a comparator and a switch device;
one end of the voltage division circuit is connected with the input power supply module, and the other end of the voltage division circuit is connected with the positive phase end of the comparator;
the negative phase end of the comparator is connected with a reference power supply, the output end of the comparator is connected with the input end of the switching device, and the output end of the switching device is connected with the feedback pin of the buck power chip.
2. The buck power supply circuit according to claim 1, wherein the voltage dividing circuit includes a first voltage-reducing element and a second voltage-reducing element, one end of the first voltage-reducing element is connected to the input power supply module, the other end of the first voltage-reducing element is connected to one end of the second voltage-reducing element, and the other end of the second voltage-reducing element is grounded;
the positive phase end of the comparator is connected between the first voltage reduction element and the second voltage reduction element.
3. The buck power supply circuit according to claim 2, wherein the input overvoltage protection module further includes a first filter circuit disposed between the voltage divider circuit and the non-inverting terminal of the comparator.
4. The buck power supply circuit according to claim 3, wherein the first filter circuit includes a third voltage-dropping element and a first capacitor;
one end of the third voltage reduction element is connected between the first voltage reduction element and the second voltage reduction element, and the other end of the third voltage reduction element is connected with the non-inverting end of the comparator;
one end of the first capacitor is connected between the third voltage reduction element and the positive phase end of the comparator, and the other end of the first capacitor is grounded.
5. The buck power supply circuit according to claim 1, wherein the input overvoltage protection module further includes a fourth voltage-reducing element and a fifth voltage-reducing element, one end of the fourth voltage-reducing element is connected to the reference power supply, the other end of the fourth voltage-reducing element is connected to one end of the fifth voltage-reducing element, the other end of the fifth voltage-reducing element is grounded, and a negative phase terminal of the comparator is connected between the fourth voltage-reducing element and the fifth voltage-reducing element.
6. The buck power supply circuit according to claim 1, wherein the input overvoltage protection module further comprises: a second filter circuit including a sixth voltage-dropping element and a second capacitor;
one end of the sixth voltage reduction element is connected with the output end of the comparator, and the other end of the sixth voltage reduction element is connected with the input end of the switching device;
one end of the second capacitor is connected between the sixth voltage reduction element and the switching device, and the other end of the second capacitor is grounded.
7. The buck power supply circuit according to claim 6, wherein the input overvoltage protection module further includes a seventh voltage-reducing element, one end of the seventh voltage-reducing element is connected to a power supply, and the other end of the seventh voltage-reducing element is connected between the output terminal of the comparator and the sixth voltage-reducing element.
8. The buck power supply circuit according to claim 6, wherein the switching device is a diode, an anode of the diode is connected to the sixth voltage-dropping element, and a cathode of the diode is connected to the feedback pin of the buck power supply chip.
9. The buck power supply circuit according to claim 1, further comprising a rectifier bridge and an electrolytic capacitor, wherein an input end of the rectifier bridge is connected to an alternating current power supply, an output end of the rectifier bridge is connected to the electrolytic capacitor, and an anode of the electrolytic capacitor is connected to the voltage dividing circuit.
10. A home appliance comprising a buck power chip and the buck power circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497624.7U CN216721166U (en) | 2021-10-15 | 2021-10-15 | Buck power supply circuit and household electrical appliances |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122497624.7U CN216721166U (en) | 2021-10-15 | 2021-10-15 | Buck power supply circuit and household electrical appliances |
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| CN216721166U true CN216721166U (en) | 2022-06-10 |
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| CN202122497624.7U Active CN216721166U (en) | 2021-10-15 | 2021-10-15 | Buck power supply circuit and household electrical appliances |
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Effective date of registration: 20230515 Address after: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 1001-1005, building 3, Tsinghua Science and Technology Park (Zhuhai) phase II scientific research incubation building, 101 University Road, Tangjiawan Town, high tech Zone, Zhuhai City, Guangdong Province, 519080 Patentee before: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. |