CN215990196U - DC-DC converter, power supply and electronic equipment - Google Patents
DC-DC converter, power supply and electronic equipment Download PDFInfo
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- CN215990196U CN215990196U CN202121991202.9U CN202121991202U CN215990196U CN 215990196 U CN215990196 U CN 215990196U CN 202121991202 U CN202121991202 U CN 202121991202U CN 215990196 U CN215990196 U CN 215990196U
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Abstract
The utility model discloses a DC-DC converter, a power supply and an electronic device, wherein the DC-DC converter comprises: a control chip; the input under-voltage protection module is electrically connected with the enable end of the control chip; the input under-voltage protection module is used for sampling the input voltage of the DC-DC converter so as to control the level conversion of the enabling end of the control chip; the output under-voltage protection module is electrically connected with the enable end of the control chip; the output under-voltage protection module is used for sampling the output voltage of the DC-DC converter so as to control the conversion of the level of the enabling end of the control chip. When the input voltage and the output voltage of the DC-DC converter are reduced, the DC-DC converter can stop working, so that the conditions that a power device is damaged and the power supply of a main board power amplifier is influenced are prevented.
Description
Technical Field
The utility model relates to the technical field of power supplies, in particular to a DC-DC converter, a power supply and electronic equipment.
Background
The DC-DC conversion module is a DC power supply module that converts different DC voltages into a desired DC voltage. When the power required by the mainboard and the power amplifier is suddenly increased at a certain time or under an abnormal condition, if the input or output voltage is reduced, the input or output current is suddenly increased, and the temperature of the power device is suddenly increased due to the large current, so that the power device is damaged in a serious condition, and the power supply of the mainboard power amplifier is influenced.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a DC-DC converter, a power supply and an electronic device, so as to solve the problem that when the power required by the main board and the power amplifier is suddenly increased at a certain time or under abnormal conditions, the input or output voltage is reduced, so that the input or output current is rapidly increased, thereby causing damage to the power device and affecting the power supply of the main board power amplifier.
The technical scheme of the utility model is as follows:
a DC-DC converter, comprising:
a control chip;
the input under-voltage protection module is electrically connected with the enable end of the control chip; the input under-voltage protection module is used for sampling the input voltage of the DC-DC converter so as to control the level conversion of the enabling end of the control chip;
the output under-voltage protection module is electrically connected with the enable end of the control chip; the output under-voltage protection module is used for sampling the output voltage of the DC-DC converter so as to control the conversion of the level of the enabling end of the control chip.
In a further aspect of the present invention, the input under-voltage protection module comprises: an input voltage sampling unit and a first switch unit; the input voltage sampling unit is electrically connected with the first switch unit; the first switch unit is electrically connected with an enabling end of the control chip.
In a further aspect of the present invention, the input voltage sampling unit comprises: a first resistor and a second resistor; one end of the first resistor is connected with an input power supply, and the other end of the first resistor is respectively connected with one end of the second resistor and the common connection end of the first switch unit; the other end of the second resistor is grounded.
In a further aspect of the present invention, the first switching unit includes: the first triode, the first diode and the third resistor; the base electrode of the first triode is connected with the common connection end of the first resistor and the second resistor; the collector of the first triode is respectively connected with the common connection end of the anode of the first diode and one end of the third resistor; the emitting electrode of the first triode is grounded; the cathode of the first diode is connected with the enabling end of the control chip; the other end of the third resistor is connected with an input power supply.
In a further aspect of the present invention, the output under-voltage protection module comprises: an output voltage sampling unit and a second switching unit; the output voltage sampling unit is electrically connected with the second switch unit; the second switch unit is electrically connected with the enable end of the control chip.
In a further aspect of the present invention, the output voltage sampling unit comprises: a fourth resistor and a fifth resistor; one end of the fourth resistor is connected with an input power supply, and the other end of the fourth resistor is respectively connected with one end of the fifth resistor and the common connection end of the second switch unit; the other end of the fifth resistor is grounded.
In a further aspect of the present invention, the second switching unit includes: the second triode, the second diode and the sixth resistor; the base electrode of the second triode is connected with the common connection end of the fourth resistor and the fifth resistor; a collector of the second triode is respectively connected with the anode of the second diode and the common connection end of one end of the sixth resistor; the emitter of the second triode is grounded; the cathode of the second diode is connected with the enabling end of the control chip; the other end of the sixth resistor is connected with an input power supply.
In a further aspect of the present invention, the DC-DC converter further comprises: the power supply comprises an input current detection module, an output current detection module, a first power switch module, a second power switch module, a third power switch module, a fourth power switch module and an inductance module; the first power switch module is respectively connected with the input current detection module, the inductance module, the first and second power switch modules and the control chip; the second power switch module is connected with the control chip; the third power switch module is respectively connected with the output current detection module, the inductance module, the fourth power switch module and the control chip; the fourth power switch module is connected with the control chip; the output current detection module is connected with the control chip.
Based on the same concept, the utility model also provides a power supply, which comprises an AC-DC converter and the DC-DC converter, wherein the DC-DC converter is electrically connected with the AC-DC converter.
Based on the same concept of the utility model, the utility model also provides an electronic device, which comprises a shell and the power supply, wherein the power supply is arranged in the shell.
The utility model provides a DC-DC converter, a power supply and an electronic device, wherein the DC-DC converter comprises: a control chip; the input under-voltage protection module is electrically connected with the enable end of the control chip; the input under-voltage protection module is used for sampling the input voltage of the DC-DC converter so as to control the level conversion of the enabling end of the control chip; the output under-voltage protection module is electrically connected with the enable end of the control chip; the output under-voltage protection module is used for sampling the output voltage of the DC-DC converter so as to control the conversion of the level of the enabling end of the control chip. The input under-voltage protection module is used for sampling the input voltage of the DC-DC converter, the output under-voltage protection module is used for sampling the output voltage of the DC-DC converter, when the input voltage drops, the input under-voltage protection module controls the enabling end of the control chip to be at a high level so as to stop the control chip to stop working, and when the output voltage drops, the output under-voltage protection module controls the enabling end of the control chip to be at the high level so as to stop the control chip to stop working, so that the DC-DC converter stops working. Therefore, when the input voltage and the output voltage of the DC-DC converter are reduced, the DC-DC converter can stop working, so that the situation that when the power required by the main board and the power amplifier is suddenly increased under a certain or abnormal condition, the input or output voltage is reduced to cause the sudden increase of the input or output current, so that the power device is damaged and the power supply of the main board power amplifier is influenced is prevented.
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 is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic power supply diagram of the power supply of the present invention.
Fig. 2 is a functional block configuration diagram of the DC-DC converter in the present invention.
Fig. 3 is a pin diagram of the control chip of the present invention.
Fig. 4 is a schematic circuit diagram of the input undervoltage protection module of the present invention.
Fig. 5 is a schematic circuit diagram of the undervoltage protection module according to the present invention.
Fig. 6 is a power schematic of the DC-DC converter of the present invention.
The various symbols in the drawings: 100. an AC-DC converter; 200. a DC-DC converter; 201. a control chip; 202. an input undervoltage protection module; 2021. an input voltage sampling unit; 2022. a first switch unit; 203. an output undervoltage protection module; 2031. an output voltage sampling unit; 2032. a second switching unit; 204. an input current detection module; 205. an output current detection module; 206. a first power switch module; 207. a second power switch module; 208. a third power switch module; 209. a fourth power switch module; 210. an inductance module; 300. and (4) loading.
Detailed Description
The utility model provides a DC-DC converter, a power supply and electronic equipment, which are applied to the field of television power supplies and can also be applied to related electronic products with similar under-voltage protection requirements. In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In the embodiments and claims, the articles "a", "an", "the" and "the" may include plural forms as well, unless the context specifically dictates otherwise. If there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any module and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The inventor researches and discovers that for the DC-DC power converter, if a DC-DC conversion circuit is under-voltage, the loop stability of the converter is affected by a slight state, and the power switching tube is severely affected by the saturation loss of an inductor due to the reduction of a serious condition. Among these, the input-output undervoltage (generally defined as less than 30% of the rated voltage) has the following hazards: the input current is increased due to undervoltage of the input voltage, the temperature rise is increased due to the increase of the current, and the device is damaged due to the saturation of the inductor; the output voltage under-voltage generally means that the load is too large (the current increases too much or even short circuit), which results in unstable output voltage, and the output voltage under-voltage can affect the normal operation of the back-end circuit, for example, the power amplifier can cause its tone quality distortion due to insufficient power supply. For example, when the power required by the motherboard and the power amplifier is suddenly increased at a certain time or under an abnormal condition, if the input or output voltage is reduced, the input or output current is suddenly increased, and the temperature of the power device is suddenly increased due to a large current, which may cause the power device to be damaged in a serious condition, affect the power supply of the motherboard power amplifier, and finally affect the overall performance and quality of the product, thereby affecting the user experience and the brand public praise thereof. Specifically, when the input voltage of the DC-DC converter decreases, and the required load power is unchanged or suddenly increased, according to the formula P ═ U × I, P is unchanged, U decreases and I increases, and according to the heating formula W ═ I2Rt, I increases, W and I are in a square relationship, the heating value increases rapidly, and at this time, the temperature rise of the DC-DC power device also increases rapidly, and if the temperature rise exceeds the experimental criterion, the power device is damaged seriously, and the whole television cannot work normally if the temperature rise occurs during the running of the whole television. Wherein, P represents power, U represents voltage, I represents current, W represents power or heating, t represents time, R represents resistance, the above formula is made into a principle explanation, and the method can be applied to quantitative and qualitative calculation of a certain monomer power device during actual analysis.
In view of the above technical problem, the present invention provides a DC-DC converter, comprising: the input undervoltage protection module is connected with the output undervoltage protection module; the input under-voltage protection module is electrically connected with an enabling end of the control chip; the output under-voltage protection module is electrically connected with an enabling end of the control chip; the input under-voltage protection module is used for sampling the input voltage of the DC-DC converter so as to control the level conversion of the enabling end of the control chip; the output under-voltage protection module is used for sampling the output voltage of the DC-DC converter so as to control the conversion of the level of the enabling end of the control chip.
Under the condition of not influencing the normal work of the circuit, the input undervoltage protection module is used for sampling the input voltage of the DC-DC converter, the output undervoltage protection module is used for sampling the output voltage of the DC-DC converter, when the input voltage drops, the input undervoltage protection module controls the enabling end of the control chip to be at a high level so as to stop the control chip from working, and therefore, the DC-DC converter stops working. Therefore, when the input voltage and the output voltage of the DC-DC converter are reduced, the DC-DC converter can stop working, so that the DC-DC converter does not work continuously in an abnormal state, and the situation that when the power required by the main board and the power amplifier is increased suddenly at a certain time or under an abnormal condition, the input or output voltage is reduced to cause the input or output current to be increased suddenly, so that the power device is damaged, and the power supply of the main board power amplifier is influenced is prevented.
Referring to fig. 1 to 6, the present invention provides a preferred embodiment of a power supply.
As shown in fig. 1, the power supply of the present invention includes an AC-DC converter 100 and a DC-DC converter 200, wherein the DC-DC converter 200 is electrically connected to the AC-DC converter 100.
Specifically, the power supply of a general product mainly includes two parts, the first part is the conversion of alternating current and direct current, i.e., the AC-DC converter 100 such as an isolation transformer, and the second part is the conversion of direct current and direct current, i.e., the DC-DC converter 200. Taking a television as an example, the power supply of the whole television is that AC power is converted into DC power through an isolation transformer, after external AC power is converted into DC power, for example, the converted voltage is 12V, and the power supply voltage required by the load 300 of the television is 5V, for example, a motherboard, a power amplifier, a T-CON control board, and the like, further conversion between DC power and DC power is required, that is, 12V converted by the isolation transformer needs to be further converted into 5V through the DC-DC converter 200.
Referring to fig. 1 to 3, in some embodiments, the DC-DC converter 200 includes: the protection circuit comprises a control chip 201, an input undervoltage protection module 202, an output undervoltage protection module 203, an input current detection module 204, an output current detection module 205, a first power switch module 206, a second power switch module 207, a third power switch module 208, a fourth power switch module 209, and an inductance module 210. The input under-voltage protection module 202 is electrically connected to an enable terminal of the control chip 201; the output under-voltage protection module 203 is electrically connected with an enable end of the control chip 201; the first power switch module 206 is respectively connected to the input current detection module 204, the inductance module 210, the first two power switch modules and the control chip 201; the second power switch module 207 is connected to the control chip 201; the third power switch module 208 is respectively connected to the output current detection module 205, the inductance module 210, the fourth power switch module 209 and the control chip 201; the fourth power switch module 209 is connected to the control chip 201; the output current detection module 205 is connected to the control chip 201. The input undervoltage protection module 202 is configured to sample an input voltage of the DC-DC converter 200 to control a level conversion of an enable terminal of the control chip 201; the output undervoltage protection module 203 is configured to control the level of the enable terminal of the control chip 201 to be switched by sampling the output voltage of the DC-DC converter 200.
Specifically, the direct current DC enters the first power switch module 206 through the input current detection module 204, enters the inductance module 210, and is output through the third power switch module 208. Since the main board is required to be 12V to 5V, and the main board is of a Buck voltage reducing structure, the first power switch module 206 and the second power switch module 207 are alternately switched on and off, wherein the third power switch module 208 is in a normally open state, and the fourth power switch module 209 is in a long closed state. The DC-DC converted voltage is output to a power supply component required by the motherboard through the input current detection module 204. Because it is necessary to keep the output stable, the output current detection module 205 is required to sample the voltage from the output terminal and transmit the output sampling feedback signal to the control chip 201, and the control chip 201 adjusts the loop according to the feedback signal to ensure the output voltage stable. When the DC-DC converter 200 normally works, the input under-voltage protection module 202 samples the input voltage of the DC-DC converter 200, the output under-voltage protection module 203 samples the output voltage of the DC-DC converter 200, and if an abnormal under-voltage is detected, the enable terminal of the control chip 201 is controlled to be at a high level, so that the control chip 201 stops working, and the DC-DC converter 200 stops working. It should be noted that, when the enable terminal of the control chip 201 is at a low level, the control chip 201 normally operates, and when the enable terminal of the control chip 201 is at a high level, the control chip 201 stops operating. Wherein, the low level voltage refers to a voltage less than 0.6V, and the high level voltage refers to a voltage greater than 1.3V.
In the above technical solution, under the condition that the normal operation of the circuit is not affected, the input under-voltage protection module 202 samples the input voltage of the DC-DC converter 200, and the output under-voltage protection module 203 samples the output voltage of the DC-DC converter 200, when the input voltage decreases, the input under-voltage protection module 202 controls the enable terminal of the control chip 201 to be at a high level to stop the control chip 201, so that the DC-DC converter 200 stops operating, and when the output voltage decreases, the output under-voltage protection module 203 controls the enable terminal of the control chip 201 to be at a high level to stop the control chip 201, so that the DC-DC converter 200 stops operating. It can be seen that, when the input voltage and the output voltage of the DC-DC converter 200 decrease, the present invention can stop the DC-DC converter 200 to make the DC-DC converter 200 continuously operate without an abnormal state, so as to prevent the power device damage and the influence on the power supply of the main board power amplifier caused by the input or output current sharply increasing due to the decrease of the input or output voltage when the power required by the main board and the power amplifier suddenly increases at a certain time or under an abnormal condition, thereby greatly improving the overall performance (reliability) and quality of the product, and further improving the user experience and the market acceptance.
Referring to fig. 2 to fig. 5, in a further implementation manner of an embodiment, the undervoltage protection input module 202 includes: an input voltage sampling unit 2021 and a first switching unit 2022; wherein the input voltage sampling unit 2021 is electrically connected to the first switching unit 2022; the first switch unit 2022 is electrically connected to an enable terminal of the control chip 201.
In some embodiments, the input voltage sampling unit 2021 comprises: a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected to an input power source, and the other end of the first resistor R1 is connected to one end of the second resistor R2 and the common terminal of the first switch unit 2022; the other end of the second resistor R2 is grounded. The first switching unit 2022 includes: a first triode Q1, a first diode D1 and a third resistor R3; the base electrode of the first triode Q1 is connected with the common end of the first resistor R1 and the second resistor R2; a collector of the first triode Q1 is respectively connected with a positive electrode of the first diode Q1 and a common connection end of one end of the third resistor R3; the emitter of the first triode Q1 is grounded; the cathode of the first diode D1 is connected with the enable end of the control chip 201; the other end of the third resistor R3 is connected to an input power supply V +.
Specifically, the first resistor R1 and the second resistor R2 are input voltage sampling resistors, the third resistor R3 is a pull-up resistor of the first transistor Q1, and the input voltage V + is divided by the first resistor R1 and the second resistor R2 for sampling. For example, when the input voltage is 12V, the voltage at the point a is 0.85V, the first transistor Q1 is turned on, the point B is clamped at a low level by the c-e pole of the first transistor Q1 and is not enough to turn on the first diode Q1, and then the enable terminal CE of the control chip U1 is at a low level, and the control chip U1 operates normally. When the input voltage drops and reaches 70% (30% de-rating) of the input voltage, the voltage at the point a will be less than 0.6V, the first triode Q1 is turned off, when the first triode Q1 is turned off, the point B becomes high level, the first diode D1 is turned on, the enable terminal CE of the control chip U1 is controlled to trigger high level, and the whole DC-DC converter will stop working, so as to achieve the undervoltage protection effect on the input voltage.
In a further implementation manner of an embodiment, the output under-voltage protection module 203 includes: an output voltage sampling unit 2031 and a second switching unit 2032; the output voltage sampling unit 2031 is electrically connected to the second switching unit 2032; the second switch unit 2032 is electrically connected to an enable terminal of the control chip 201.
In some embodiments, the output voltage sampling unit 2031 comprises: a fourth resistor R4 and a fifth resistor R5; one end of the fourth resistor R4 is connected to an input power source, and the other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and the common terminal of the second switch unit 2032; the other end of the fifth resistor R5 is grounded. The second switching unit 2032 includes: a second triode Q2, a second diode D2 and a sixth resistor R6; the base of the second triode Q2 is connected to the common terminal of the fourth resistor R4 and the fifth resistor R5, respectively; a collector of the second triode Q2 is respectively connected to a common terminal of the anode of the second diode D2 and one end of the sixth resistor R6; the emitter of the second triode Q2 is grounded; the cathode of the second diode D2 is connected with the enabling end of the control chip U1; the other end of the sixth resistor R6 is connected to an input power supply V +.
Specifically, the fourth resistor R4 and the fifth resistor R5 are output voltage sampling resistors, the sixth resistor R6 is a pull-up resistor of the second transistor Q2, and the output voltage VOUT is divided by the fourth resistor R4 and the fifth resistor R5 for sampling. For example, when the output voltage is stabilized at 5V, the voltage at the point C is 0.856V, the second transistor Q2 is turned on, the point D is clamped at a low level by the C-e pole of the second transistor Q2, which is insufficient to turn on the second diode Q2, the enable terminal CE of the control chip U1 is at a low level, and the control chip U1 operates normally. When the output voltage drops and reaches 70% (30 derates) of the output voltage, the voltage at the point C is smaller than 0.6V, the second triode Q2 is cut off, when the second triode Q2 is cut off, the point D becomes a high level (actually, VOUT voltage), the second triode D2 is directly turned on, the enable end of the control chip U1 triggers the high level, and the whole DC-DC converter 200 stops working to achieve the function of undervoltage protection of the output voltage.
Referring to fig. 6, in some embodiments, the first power switch module 206 includes a first field effect transistor Q3 and a seventh resistor R7, the seventh resistor R7 is connected to the first field effect transistor Q3 as a driving resistor of the first field effect transistor Q3, the second power switch module 207 includes a second field effect transistor Q4 and an eighth resistor R8, the eighth resistor R8 is connected to the second field effect transistor Q4 as a driving resistor of the second field effect transistor Q4, the third power switch module 208 includes a third field effect transistor Q5 and a ninth resistor R9, the ninth resistor R9 is connected to the third field effect transistor Q5 as a driving resistor of the third field effect transistor Q5, the fourth power switch module 209 includes a fourth field effect transistor Q6 and a tenth resistor R10, the tenth resistor R10 is connected to the fourth field effect transistor Q6, as a driving resistor of the fourth field effect transistor Q6, the inductor module 210 is a DC-DC inductor L1, and the DC-DC inductor L1 is respectively connected to the first field effect transistor Q3, the second field effect transistor Q4 and the third field effect transistor Q5. The input current detection module 204 includes a fuse F1, a first capacitor C1, a second capacitor C2, an eleventh resistor R11, and a twelfth resistor R12, after the fuse F1 is connected to an input voltage, the first capacitor C1 and the second capacitor C2 are connected in parallel to form an input filter unit, and the eleventh resistor R11 and the twelfth resistor R12 are connected in parallel to serve as an input current detection resistor. The output current detection module 205 includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a thirteenth resistor C13, and a fourteenth resistor C14, the fifteenth resistor C15 is connected in parallel with the sixteenth resistor C16 to serve as a detection resistor of the output current, and the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are connected in parallel to serve as an output filter capacitor. The voltage after the DC-DC conversion is output to a power supply part required by the mainboard through a thirteenth resistor R13 and a fourteenth resistor R14. Because the output needs to be kept stable, the voltage at the output end needs to be sampled, the output sampling feedback signal is transmitted to the control chip U1 through the output current detection resistor, and the control chip U1 ensures the stability of the output voltage according to the feedback signal regulation loop.
In fig. 4, 5 and 6, the same connecting dots are shown in the form of arrows and with the same names; the same mesh point of "CE" in this document represents the same connection network, i.e. the enabling signal; DC stands for direct current supply, and DC-DC stands for direct conversion of different voltages of the direct current supply.
In some embodiments, the present invention further provides an electronic device, which may be an electronic product such as a television, and the electronic device includes a housing and the power supply, and the power supply is disposed in the housing. As described in the embodiment of a power supply, details are not repeated herein.
In summary, according to the DC-DC converter, the power supply and the electronic device provided by the present invention, the input under-voltage protection module samples the input voltage of the DC-DC converter, and the output under-voltage protection module samples the output voltage of the DC-DC converter, when the input voltage decreases, the input under-voltage protection module controls the enable terminal of the control chip to be at a high level to stop the control chip, so that the DC-DC converter stops operating, and when the output voltage decreases, the output under-voltage protection module controls the enable terminal of the control chip to be at a high level to stop the control chip, so that the DC-DC converter stops operating. Therefore, when the input voltage and the output voltage of the DC-DC converter are reduced, the DC-DC converter can stop working, so that the situation that when the power required by the main board and the power amplifier is suddenly increased under a certain or abnormal condition, the input or output voltage is reduced to cause the sudden increase of the input or output current, so that the power device is damaged and the power supply of the main board power amplifier is influenced is prevented.
The utility model is used in the design of non-isolated power supply of electronic products with similar protection requirements. The specific use can be made by slightly modifying the parameter values according to the actual use condition. The test shows that the power supply fully accords with the operation logic, the functions to be realized are realized, the number of devices is small, the cost is low, the principle is simple and feasible, the functions and the performance of the power supply are not influenced, the practical problem can be effectively solved, the executability is strong, and the popularization range is wide.
It is to be understood that the utility model is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the utility model as defined by the appended claims.
Claims (10)
1. A DC-DC converter, comprising:
a control chip;
the input under-voltage protection module is electrically connected with the enable end of the control chip; the input under-voltage protection module is used for sampling the input voltage of the DC-DC converter so as to control the level conversion of the enabling end of the control chip;
the output under-voltage protection module is electrically connected with the enable end of the control chip; the output under-voltage protection module is used for sampling the output voltage of the DC-DC converter so as to control the conversion of the level of the enabling end of the control chip.
2. The DC-DC converter of claim 1, wherein the input undervoltage protection module comprises: an input voltage sampling unit and a first switch unit; the input voltage sampling unit is electrically connected with the first switch unit; the first switch unit is electrically connected with an enabling end of the control chip.
3. The DC-DC converter according to claim 2, wherein the input voltage sampling unit comprises: a first resistor and a second resistor; one end of the first resistor is connected with an input power supply, and the other end of the first resistor is respectively connected with one end of the second resistor and the common connection end of the first switch unit; the other end of the second resistor is grounded.
4. The DC-DC converter according to claim 3, wherein the first switching unit comprises: the first triode, the first diode and the third resistor; the base electrode of the first triode is connected with the common connection end of the first resistor and the second resistor; the collector of the first triode is respectively connected with the anode of the first diode and the common connection end of one end of the third resistor; the emitting electrode of the first triode is grounded; the cathode of the first diode is connected with the enabling end of the control chip; the other end of the third resistor is connected with an input power supply.
5. The DC-DC converter of claim 1, wherein the output under-voltage protection module comprises: an output voltage sampling unit and a second switching unit; the output voltage sampling unit is electrically connected with the second switch unit; the second switch unit is electrically connected with the enable end of the control chip.
6. The DC-DC converter according to claim 1, wherein the output voltage sampling unit comprises: a fourth resistor and a fifth resistor; one end of the fourth resistor is connected with an input power supply, and the other end of the fourth resistor is respectively connected with one end of the fifth resistor and the common connection end of the second switch unit; the other end of the fifth resistor is grounded.
7. The DC-DC converter according to claim 6, wherein the second switching unit comprises: the second triode, the second diode and the sixth resistor; the base electrode of the second triode is connected with the common connection end of the fourth resistor and the fifth resistor; a collector of the second triode is respectively connected with a common connection end of the anode of the second diode and one end of the sixth resistor; the emitter of the second triode is grounded; the cathode of the second diode is connected with the enabling end of the control chip; the other end of the sixth resistor is connected with an input power supply.
8. The DC-DC converter according to claim 1, further comprising: the power supply comprises an input current detection module, an output current detection module, a first power switch module, a second power switch module, a third power switch module, a fourth power switch module and an inductance module; the first power switch module is respectively connected with the input current detection module, the inductance module, the first and second power switch modules and the control chip; the second power switch module is connected with the control chip; the third power switch module is respectively connected with the output current detection module, the inductance module, the fourth power switch module and the control chip; the fourth power switch module is connected with the control chip; the output current detection module is connected with the control chip.
9. A power supply comprising an AC-DC converter and a DC-DC converter according to any of claims 1 to 8, the DC-DC converter being electrically connected to the AC-DC converter.
10. An electronic device comprising a housing and the power supply of claim 9, the power supply disposed within the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121991202.9U CN215990196U (en) | 2021-08-20 | 2021-08-20 | DC-DC converter, power supply and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121991202.9U CN215990196U (en) | 2021-08-20 | 2021-08-20 | DC-DC converter, power supply and electronic equipment |
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| Publication Number | Publication Date |
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| CN215990196U true CN215990196U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121991202.9U Active CN215990196U (en) | 2021-08-20 | 2021-08-20 | DC-DC converter, power supply and electronic equipment |
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| Country | Link |
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| CN (1) | CN215990196U (en) |
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