Power supply circuit, power supply module and camera device
By connecting the parallel capacitors, transient voltage suppression diodes (TVS) and series resistors R in the power supply circuit, the complex and cost problems of traditional surge protection solutions are solved, and efficient, safe and low-cost surge protection effects are achieved.
Patent Information
- Application Number
- CN202411633851.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-02-28
AI Technical Summary
The traditional surge protection solution is implemented in complex ways, high cost and poor practicality.
A power supply circuit is designed, including a parallel capacitor, a transient voltage suppression diode (TVS) and a series resistor R, through the synergy of these components, to provide protection when a surge occurs, and avoid damage to the subsequent circuit by the surge.
This solution effectively reduces the damage to the circuit by surges, reduces maintenance costs, realizes a simple design and low-cost solution, while improving the practicality and safety of camera equipment.
Smart Images
Figure CN119543623A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of camera technology, and in particular to a power supply circuit, a power supply module and a camera device. Background Art
[0002] An electrical surge is a peak value that exceeds the stable value in an instant, including surge voltage and surge current. Its main characteristics are high voltage pulse, short duration, duration of microsecond level, fast rise speed, large current and strong energy. The hazards of surge include damage to electronic components, burning of circuit boards and fire.
[0003] Therefore, surges are widely present in electronic circuits, and thermistors (Positive Temperature Coefficient, PTC) + transient voltage suppressor diodes (Transient Voltage Suppressor, TVS) are often used in designs for protection. When the TVS tube is short-circuited by a surge, the product cannot continue to be used. In the traditional solution, an OVP circuit is added to the power input end, and the PMOS tube is turned on by the transistor overvoltage protection, which cuts off the PMOS tube and stops the output voltage, protecting the load connected later (such as the motherboard).
[0004] However, traditional solutions are complex to implement, costly, and have poor practicality. Summary of the invention
[0005] The present invention provides a power supply circuit, a power supply module and a camera device to solve the technical problems of complexity, high cost and poor practicality in traditional solutions.
[0006] In a first aspect, a power supply circuit is provided, the power supply circuit comprising a power supply input terminal, a thermistor, a first capacitor, a second capacitor, a resistor, a transient voltage suppression diode, and a power supply output terminal, wherein: One end of the power input terminal is connected to one end of the thermistor, the other end of the thermistor is connected to a parallel end of the first capacitor and the second capacitor, and the other parallel end of the first capacitor and the second capacitor is connected to the ground terminal; A parallel end of the first capacitor and the second capacitor is also connected to one end of the resistor and the power supply output end, the other end of the resistor is connected to one end of the transient voltage suppression diode, and the other end of the transient voltage suppression diode is connected to the ground end.
[0007] Furthermore, the power supply circuit also includes an anti-flooding diode, wherein a parallel end of the first capacitor and the second capacitor is also connected to one end of the resistor and the positive end of the anti-flooding diode, and the negative end of the anti-flooding diode is connected to the power supply output end.
[0008] Furthermore, the anti-flooding diode includes a Schottky diode.
[0009] Furthermore, the resistor is a chip resistor.
[0010] Furthermore, the resistance of the resistor is smaller than a preset resistance.
[0011] Furthermore, the resistance of the resistor is 0 ohm.
[0012] Furthermore, the capacitance of the first capacitor and the second capacitor are both greater than a preset capacitance.
[0013] Furthermore, the capacitance of the first capacitor is 10uf, and the capacitance of the second capacitor is 100nf.
[0014] Furthermore, the power supply circuit further includes a DC power supply module, and the DC power supply module includes a control unit, a power circuit, an inductor unit, a first detection unit, a second detection unit, a third capacitor, a switch tube, a fourth capacitor and a DC source; Wherein, a first end of the control unit is connected to one end of the power circuit, the other end of the power circuit is connected to one end of the inductor unit, the other end of the inductor unit is connected to one end of the DC source, one end of the third capacitor, the power input end, the first end of the switch tube and the first input end of the second detection unit, the second end of the switch tube is connected to the second input end of the second detection unit and one end of the fourth capacitor, and the output end of the second detection unit is connected to the second end of the control unit and the control end of the switch tube; The output end of the first detection unit is connected to the control end of the switch tube, the input end of the first detection unit is connected to the third end of the control unit, and the other ends of the third capacitor and the fourth capacitor are both connected to the ground.
[0015] Furthermore, when the first detection unit detects that the load information of the subsequent circuit is less than a set value, the control unit controls the DC power supply module to enter a low power consumption mode, and the low power consumption mode is used to shut down all power consumption units except the second detection unit and / or the DC source.
[0016] In a second aspect, a power supply module is provided, the power supply module comprising the power supply circuit as described in any one of the above items.
[0017] In a third aspect, a camera device is provided, comprising a circuit main board and a power module as described in any one of the preceding items, wherein the power supply end of the circuit main board is connected to the power output end of the power module, and the power input end of the power module is used to connect to an external power supply.
[0018] It can be seen that in this embodiment, a power supply circuit is provided. On the one hand, the buffering capacity of the power supply current can be enhanced by the parallel capacitor. The parallel TVS tube is also connected in series with a resistor R. When there is a momentary surge in the power supply branch, the transient voltage suppression diode TVS is turned on. In extreme cases, based on the circuit design of the present application, there are two situations: the transient voltage suppression diode TVS burns out first and shorts out. Under continuous large current, the resistor R burns out, which can leave reaction time for the thermistor PTC to protect the subsequent circuit (that is, the subsequent circuit connected to the power output terminal DC_IN), and does not affect the use after powering on again; in another case, the ohmic resistor R burns out first, leaving reaction time for the thermistor PTC to protect the subsequent circuit, and it can also continue to work. The transient voltage suppression diode TVS is not burned and can continue to be used, reducing maintenance costs. The solution is simple to implement, with fewer components, safety, low cost, and strong practicality. It is a cost-effective solution to the power input surge problem of camera equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.
[0020] Figure 1 is a structural schematic diagram of a power supply circuit in one embodiment of the present invention; Figure 2 is another structural schematic diagram of a power supply circuit in one embodiment of the present invention; Figure 3 The present invention is a schematic structural diagram of a DC power supply module of a power supply circuit in an embodiment of the present invention. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0022] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.
[0023] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.
[0024] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.
[0025] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.
[0026] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.
[0027] Please refer to Figure 1-Figure 2 As shown, the present invention provides a power supply circuit, the power supply circuit includes a power input terminal DC, a thermistor PTC, a first capacitor C1, a second capacitor C2, a resistor R, a transient voltage suppression diode TVS and a power output terminal DC_IN, wherein: One end of the power input terminal DC is connected to one end of the thermistor PTC, the other end of the thermistor PTC is connected to a parallel end of the first capacitor C1 and the second capacitor C2, and the other parallel end of the first capacitor C1 and the second capacitor C2 is connected to the ground terminal GND; A parallel end of the first capacitor C1 and the second capacitor C2 is also connected to one end of the resistor R and the power output terminal DC_IN, the other end of the resistor R is connected to one end of the transient voltage suppression diode TVS, and the other end of the transient voltage suppression diode TVS is connected to the ground terminal GND.
[0028] The power input terminal DC is used to connect to an external DC power supply, such as 12V, 24V or other DC power supplies, and the power output terminal DC_IN is used to power electronic devices, which include, but are not limited to, camera devices or other small electronic devices. The power supply circuit can be mounted on the mainboard circuit of the electronic device to power the mainboard of the electronic device, or it can be connected to the mainboard of the electronic device in the form of a unit module to power the electronic device, without specific limitation.
[0029] It can be seen that in this embodiment, a power supply circuit is provided. On the one hand, the buffering capacity of the power supply current can be enhanced by the parallel capacitor. The parallel TVS tube is also connected in series with a resistor R. When there is a momentary surge in the power supply branch, the transient voltage suppression diode TVS is turned on. In extreme cases, based on the circuit design of the present application, there are two situations: the transient voltage suppression diode TVS burns out first and shorts out. Under continuous large current, the resistor R burns out, which can leave reaction time for the thermistor PTC to protect the subsequent circuit (that is, the subsequent circuit connected to the power output terminal DC_IN), and does not affect the use after powering on again; in another case, the ohmic resistor R burns out first, leaving reaction time for the thermistor PTC to protect the subsequent circuit, and it can also continue to work. The transient voltage suppression diode TVS is not burned and can continue to be used, reducing maintenance costs. The solution is simple to implement, with fewer components, safety, low cost, and strong practicality. It is a cost-effective solution to the power input surge problem of camera equipment.
[0030] In one embodiment, the power supply circuit also includes an anti-flooding diode VD, wherein a parallel end of the first capacitor and the second capacitor is also connected to one end of the resistor R and the positive end of the anti-flooding diode VD, and the negative end of the anti-flooding diode VD is connected to the power supply output end DC_IN.
[0031] In this embodiment, an anti-flooding diode VD is connected in series between the subsequent circuit and one end of the resistor R. Due to the existence of the anti-flooding diode VD, the anti-flooding diode VD is added to prevent back-flooding, so as to further improve the safety of the solution.
[0032] Exemplarily, in one embodiment, the anti-flooding diode VD includes a Schottky diode, that is, the anti-flooding diode VD can be directly implemented by a Schottky diode. It should be understood that the Schottky diode is a special diode that has an anti-backflow characteristic. It plays a role in preventing current backflow in the power supply circuit to protect the circuit from damage. In addition, it can also prevent the influence of voltage peaks that may exist during the operation of the circuit. Of course, depending on the actual application scenario, other diodes or other devices for anti-backflow can also be used to implement it, and there is no specific limitation.
[0033] In one embodiment, the resistor R is a chip resistor, such as a chip resistor in a 0603 package. , the resistance value of the resistor R is less than the preset resistance value. Exemplarily, as an example, the resistance value of the resistor R may be 0 ohm.
[0034] It should be noted that, in order to ensure that the resistor R can burn out within the required time, this embodiment can make the resistance value of the resistor R less than the preset resistance value, such as 0 ohms, so that the resistor R can burn out within the required time, improving the feasibility of the solution. In addition, the 0 ohm chip resistor is a non-flammable material, which further enhances the safety of the circuit board; and the transient voltage suppression diode TVS connected in series with the 0 ohm chip resistor is also a non-flammable material, which further enhances and ensures the safety of the circuit.
[0035] In one embodiment, the capacitance of the first capacitor C1 and the second capacitor C2 are both greater than the preset capacitance, and large capacitors are connected in parallel to enhance the current buffering capability. Exemplarily, in one embodiment, the capacitance of the first capacitor is 10uf / 25V, and the capacitance of the second capacitor is 100nf / 50V.
[0036] like Figure 2 As shown, Figure 2 This is an example of a circuit circuit, wherein the power input terminal is used to connect to an external DC power supply 12V, and the power output terminal 12_IN is used to power an electronic device, and the electronic device includes, but is not limited to, a camera device or other small electronic devices. The power circuit can be mounted on the mainboard circuit of the electronic device to power the mainboard of the electronic device, or it can be connected to the mainboard of the electronic device in the form of a unit module to power the electronic device, and the specific parameters of the thermistor PTC are 16V / 2.5A.
[0037] like Figure 3 As shown, an embodiment of the present application provides a power supply circuit, which also includes a DC power supply module, and the DC power supply module includes a control unit 101, a power circuit, an inductor unit 102, a first detection unit 103, a second detection unit 104, a third capacitor C3, a switch tube Q, a fourth capacitor C4 and a DC source 105.
[0038] The first end of the control unit 101 is connected to one end of the power circuit, the other end of the power circuit is connected to one end of the inductor unit, the other end of the inductor unit is connected to one end of the DC source 105, one end of the third capacitor C3, the power input end DC, the first end of the switch tube P and the first input end of the second detection unit 104. Figure 3In order to simplify the description, the power circuit and the inductor unit are represented by a block diagram 102, that is, a first end of the control unit 101 is connected to one end of the power circuit and the inductor unit 102, the other end of the power circuit and the inductor unit 102 is connected to one end of the DC source 105, one end of the third capacitor C3, the power input end DC, the first end of the switch tube Q and the first input end of the second detection unit 104, the second end of the switch tube Q is connected to the second input end of the second detection unit 104 and one end of the fourth capacitor C4, and the output end (LPM_out) of the second detection unit 104 is connected to the second end of the control unit 101 and the control end of the switch tube Q; The first terminal (LPM_in) of the first detection unit 103 is connected to the control terminal of the switch tube P, the second terminal of the first detection unit 103 is connected to the third terminal of the control unit 101, and the other terminals of the third capacitor C3 and the fourth capacitor C4 are connected to the ground terminal.
[0039] In this embodiment, the first detection unit 103 is used to detect the load information of the switching power supply in real time. When it is detected that the load information is less than a certain set value, the control unit controls the switching power supply to enter a low power consumption mode, and when entering the low power consumption mode, it is used to turn off all power consumption units except the second detection unit 104 and / or the DC source 105. When entering the low power consumption mode, when the switch tube Q is turned off, the voltage Cvref on the fourth capacitor C4 is Vout when the switch tube Q is initially turned off. That is to say, when initially entering the low power consumption mode, Cvref is equal to Vout.
[0040] After the DC power supply module enters the low power consumption mode, the rear stage of the third capacitor C3 has a load, and due to the presence of the load, the voltage Vout will slowly decrease. When the second detection unit 104 detects that Vout is less than the reference voltage generated by Cvref, the low power consumption mode is exited, and the switch tube Q will be turned on again to connect the fourth capacitor C4 and the third capacitor C3. When the load of the third capacitor C3 is 0, that is, the third capacitor Cout has no load, due to the presence of the DC source 105, the output voltage Vout can be effectively guaranteed, and the decline speed will be faster than when there is no DC source 105.
[0041] In this embodiment, by adding a DC source 105, the decreasing speed of the output voltage Vout can be made greater than the decreasing speed of Cvref, which effectively avoids the voltage Cvref from decreasing faster, so that the DC power supply module can successfully exit the low power consumption mode, thereby improving practicality and reliability. Moreover, by reasonably configuring the values of the fourth capacitor C4 and the DC source, both cost and power consumption can be taken into account.
[0042] In one embodiment, a power supply module is provided, the power supply module comprising a power supply circuit as described in any of the above items, the power supply circuit comprising a power supply input terminal, a thermistor, a first capacitor, a second capacitor, a resistor, a transient voltage suppression diode and a power supply output terminal, wherein: One end of the power input terminal is connected to one end of the thermistor, the other end of the thermistor is connected to a parallel end of the first capacitor and the second capacitor, and the other parallel end of the first capacitor and the second capacitor is connected to the ground terminal; A parallel end of the first capacitor and the second capacitor is also connected to one end of the resistor and the power supply output end, the other end of the resistor is connected to one end of the transient voltage suppression diode, and the other end of the transient voltage suppression diode is connected to the ground end.
[0043] Furthermore, the power supply circuit also includes an anti-flooding diode, wherein a parallel end of the first capacitor and the second capacitor is also connected to one end of the resistor and the positive end of the anti-flooding diode, and the negative end of the anti-flooding diode is connected to the power supply output end.
[0044] Furthermore, the anti-flooding diode includes a Schottky diode.
[0045] Furthermore, the resistor is a chip resistor.
[0046] Furthermore, the resistance of the resistor is smaller than a preset resistance.
[0047] Furthermore, the resistance of the resistor is 0 ohm.
[0048] Furthermore, the capacitance of the first capacitor and the second capacitor are both greater than a preset capacitance.
[0049] Furthermore, the capacitance of the first capacitor is 10uf, and the capacitance of the second capacitor is 100nf.
[0050] It can be seen that in this embodiment, a power supply module (power supply unit) is provided. On the one hand, the buffering capacity of the power supply current can be enhanced by connecting capacitors in parallel. The TVS tube connected in parallel is also connected in series with a resistor R. When a momentary surge occurs in the power supply branch, the transient voltage suppression diode TVS is turned on. In extreme cases, based on the circuit design of the present application, there are two situations: the transient voltage suppression diode TVS burns out first and shorts out. Under continuous high current, the resistor R burns out, which can leave reaction time for the thermistor PTC to protect the subsequent circuit (i.e., the subsequent circuit connected to the power output terminal DC_IN), and does not affect the use after powering on again; in another case, the ohmic resistor R burns out first, leaving reaction time for the thermistor PTC to protect the subsequent circuit, and it can also continue to work. The transient voltage suppression diode TVS is not burned out and can continue to be used, reducing maintenance costs. The solution is simple to implement, with fewer components, safety, low cost, and strong practicality. It is a cost-effective solution to the power input surge problem of camera equipment.
[0051] In one embodiment, a camera device is provided, which includes a circuit main board and a power module as described in any of the above items, wherein the power supply end of the circuit main board is connected to the power output end of the power module, and the power input end of the power module is used to connect to an external power supply.
[0052] It can be seen that in this embodiment, a camera device, such as a network camera device, is provided. On the one hand, the buffering capacity of the power supply current can be enhanced by connecting capacitors in parallel. The TVS tube connected in parallel is also connected in series with a resistor R. When a momentary surge occurs in the power supply branch of the camera device, the transient voltage suppression diode TVS is turned on. In extreme cases, based on the circuit design of the present application, there are two situations: the transient voltage suppression diode TVS burns out first and shorts out. Under continuous high current, the resistor R burns out, which can leave reaction time for the thermistor PTC to protect the subsequent circuit (i.e., the subsequent circuit connected to the power output terminal DC_IN), and does not affect the use after powering on again; in another case, the ohmic resistor R burns out first, leaving reaction time for the thermistor PTC to protect the subsequent circuit, and it can also continue to work. The transient voltage suppression diode TVS is not burned out and can continue to be used, reducing maintenance costs. The solution is simple to implement, with fewer components, safety, low cost, and strong practicality. It is a cost-effective solution to the power input surge problem of camera devices.
[0053] In summary, the embodiments of the present application have cost advantages in terms of design, are beneficial to improving surge resistance, extending the service life of the machine, and improving user experience.
[0054] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.
Claims
1. A power supply circuit, comprising a power supply input terminal, a thermistor, a first capacitor, a second capacitor, a resistor, a transient voltage suppression diode and a power supply output terminal, characterized in that: One end of the power input terminal is connected to one end of the thermistor, the other end of the thermistor is connected to a parallel end of the first capacitor and the second capacitor, and the other parallel end of the first capacitor and the second capacitor is connected to the ground terminal; A parallel end of the first capacitor and the second capacitor is also connected to one end of the resistor and the power supply output end, the other end of the resistor is connected to one end of the transient voltage suppression diode, and the other end of the transient voltage suppression diode is connected to the ground end.
2. The power supply circuit according to claim 1, characterized in that: The power supply circuit also includes an anti-flooding diode, wherein a parallel end of the first capacitor and the second capacitor is also connected to one end of the resistor and the positive end of the anti-flooding diode, and the negative end of the anti-flooding diode is connected to the power supply output end.
3. The power supply circuit according to claim 2, characterized in that: The anti-flooding diode comprises a Schottky diode.
4. The power supply circuit according to claim 1, characterized in that: The resistor is a chip resistor, and the resistance value of the resistor is less than a preset resistance value.
5. The power supply circuit according to claim 4, characterized in that: The resistance value of the resistor is 0 ohm.
6. The power supply circuit according to claim 1, characterized in that: The capacitance of the first capacitor and the second capacitor are both greater than a preset capacitance, the capacitance of the first capacitor is 10uf, and the capacitance of the second capacitor is 100nf.
7. The power supply circuit according to any one of claims 1 to 6, characterized in that: The power supply circuit also includes a DC power supply module, which includes a control unit, a power circuit, an inductor unit, a first detection unit, a second detection unit, a third capacitor, a switch tube, a fourth capacitor and a DC source; Wherein, a first end of the control unit is connected to one end of the power circuit, the other end of the power circuit is connected to one end of the inductor unit, the other end of the inductor unit is connected to one end of the DC source, one end of the third capacitor, the power input end, the first end of the switch tube and the first input end of the second detection unit, the second end of the switch tube is connected to the second input end of the second detection unit and one end of the fourth capacitor, and the output end of the second detection unit is connected to the second end of the control unit and the control end of the switch tube; The output end of the first detection unit is connected to the control end of the switch tube, the input end of the first detection unit is connected to the third end of the control unit, and the other ends of the third capacitor and the fourth capacitor are both connected to the ground.
8. The power supply circuit according to claim 7, characterized in that: When the first detection unit detects that the load information of the subsequent circuit is less than a set value, the control unit controls the DC power supply module to enter a low power consumption mode, and the low power consumption mode is used to shut down all power consumption units except the second detection unit and / or the DC source.
9. A power module, characterized in that: The power module comprises the power circuit according to any one of claims 1 to 6.
10. A camera device, characterized in that: The camera device includes a circuit mainboard and a power module as described in claim 9, wherein the power supply end of the circuit mainboard is connected to the power output end of the power module, and the power input end of the power module is used to connect to an external power supply.