Power supply circuit
By designing a power supply circuit including a comparison circuit and a shutdown circuit in the electronic product circuit, the problem of high instantaneous current demand during start-up of the processor is solved, the stable output of the capacitor voltage and the simplification of the power supply circuit are achieved, and the cost is reduced and complexity.
Patent Information
- Application Number
- CN202420894208.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-26
AI Technical Summary
In existing electronic product circuits, the demand for instantaneous current at the start of the processor is high, resulting in complex circuit design and increased cost, and electromagnetic compatibility problems.
Design a power supply power circuit, including a first capacitor, a power supply charging circuit, a comparison circuit and a shutdown circuit, compare the reference value and capacitor voltage through the comparison circuit, control charging and discharge, ensure that the voltage across the capacitor is stable at 15V, and simplify Power circuit layout.
Through the control of the comparison circuit, a stable output of 15V voltage is achieved, the power supply circuit layout is simplified, the hardware cost is reduced, and the electromagnetic compatibility design problem is solved.
Smart Images
Figure CN222192148U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply circuits, in particular to a power supply circuit. Background Art
[0002] Processors and other chips in existing electronic product circuits consume a large amount of current at the moment of startup. Conventional designs will specially design a power supply circuit (such as using buck or flyback topology) to meet the power consumption requirements of processors and other chips in the circuit, which leads to complex circuit design, high cost, and design problems such as electromagnetic compatibility.
[0003] Especially when the processor starts up, its instantaneous current demand may be much higher than its current level during normal operation. In order to cope with this instantaneous high current, power supply design often requires additional components and complex control strategies, which not only increases hardware costs but also may lead to complex circuit board layout. Utility Model Content
[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.
[0005] In view of the above problems and / or problems existing in the prior art, the present utility model is proposed.
[0006] Therefore, the problem to be solved by the present invention is how to solve the problem of complex layout of the existing power supply circuit.
[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a power supply circuit, comprising a first capacitor; a power supply charging circuit, connected to the non-grounded end of the first capacitor; a comparison circuit, comprising a comparator and a reference source, the comparator is connected to the non-grounded end of the first capacitor, and the reference source is connected to the negative input end of the comparator; a shutdown circuit, comprising an N-channel enhancement MOS, the D pole of the N-channel enhancement MOS is connected to the power supply charging circuit, the S pole of the N-channel enhancement MOS is connected to the comparator, and the G pole of the N-channel enhancement MOS is connected to the output end of the comparator.
[0008] As a preferred solution of the power supply circuit of the utility model, wherein: the power supply charging circuit includes a current limiting resistor and an N-channel depletion MOS, the current limiting resistor is connected in series with the N-channel depletion MOS, one end of the current limiting resistor is connected to the power supply, the other end of the current limiting resistor is connected to the D pole of the N-channel depletion MOS, and the S pole of the N-channel depletion MOS is connected to the first capacitor.
[0009] As a preferred solution of the power supply circuit of the utility model, the reference source includes a fifth resistor, and the fifth resistor is connected across the path between the first capacitor and the negative input terminal of the comparator.
[0010] As a preferred solution of the power supply circuit of the utility model, the reference source includes a three-terminal reference integrated circuit, the first and second terminals of the three-terminal reference integrated circuit are connected to the path between the first capacitor and the negative input terminal of the comparator, and the third terminal of the three-terminal reference integrated circuit is connected to the negative electrode of the comparator.
[0011] As a preferred solution of the power supply circuit of the utility model, the comparison circuit further includes an actual voltage sampling circuit, and the actual voltage sampling circuit is connected to the positive electrode of the comparator by means of voltage division.
[0012] As a preferred solution of the power supply circuit of the utility model, the actual voltage sampling circuit includes a seventh resistor, an eleventh resistor and a third capacitor, the seventh resistor is connected in series on the path between the first capacitor and the positive input terminal of the comparator, and one end of the eleventh resistor and the third capacitor are both connected to the path between the first capacitor and the positive input terminal of the comparator, and the other ends of the eleventh resistor and the third capacitor are both connected to the negative electrode of the comparator.
[0013] As a preferred solution of the power supply circuit of the utility model, wherein: the D pole of the N-channel enhancement MOS is connected to the G pole of the N-channel depletion MOS.
[0014] As a preferred solution of the power supply circuit of the utility model, the power supply charging circuit also includes a sixth resistor, one end of the sixth resistor is connected to the S pole of the N-channel depletion MOS, and the other end of the sixth resistor is connected to the G pole of the N-channel depletion MOS.
[0015] As a preferred solution of the power supply circuit of the utility model, the power supply charging circuit also includes a second capacitor, one end of the second capacitor is connected to the S pole of the N-channel depletion MOS, and the other end of the second capacitor is grounded.
[0016] As a preferred solution of the power supply circuit of the utility model, the shutdown circuit further comprises an eighth resistor, a tenth resistor and a fourth capacitor, the eighth resistor is connected in series to the path connecting the G pole of the N-channel enhancement MOS and the output end of the comparator; one end of the tenth resistor and the fourth capacitor are connected to the path connecting the G pole of the N-channel enhancement MOS and the output end of the comparator, and the other ends of the tenth resistor and the fourth capacitor are both connected to the negative electrode of the comparator.
[0017] The beneficial effects of the utility model are as follows: a reference value and a voltage sampling value of the first capacitor are compared by a comparison circuit; when the voltage across the first capacitor is higher than 15V, discharging starts; when the voltage across the first capacitor is lower than 15V, charging starts; and charging and discharging are repeated in this way, thereby ensuring a stable output of a 15V voltage and a simple layout of the power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:
[0019] Figure 1 This is the circuit diagram of the power supply circuit. DETAILED DESCRIPTION
[0020] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.
[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.
[0023] Example 1
[0024] Reference Figure 1 , which is the first embodiment of the utility model, and this embodiment provides a power supply circuit.
[0025] Specifically, the power supply circuit includes a first capacitor C1, a power supply charging circuit 100, a comparison circuit 200 and a shutdown circuit 300; wherein the power supply charging circuit 100 is used to charge the first capacitor C1, the voltage of the first capacitor C1 is used to supply the comparison circuit 200, the comparison circuit 200 is used to compare the reference value and the voltage sampling value of the first capacitor C1, and the shutdown circuit 300 is used to obtain a comparison signal of the reference value and the voltage sampling value and control the shutdown of the power supply charging circuit 100.
[0026] When in use, the reference value and the voltage sampling value of the first capacitor C1 are compared through the comparison circuit 200. When the voltage across C1 exceeds 15V, the high voltage will stop charging C1, ensuring that the voltage across C1 is stable at 15V and C1 is in the discharge mode; when the voltage across C1 is lower than 15V, charging starts again, and the charging and discharging are repeated in this way, ensuring the stable output of 15V voltage while simplifying the layout of the power supply circuit.
[0027] Example 2
[0028] See also Figure 1 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.
[0029] Specifically, the power supply and charging circuit 100 includes a current limiting resistor 101 and an N-channel depletion-type MOSQ1. The current limiting resistor 101 is connected in series with the N-channel depletion-type MOSQ1. One end of the current limiting resistor 101 is connected to the power supply, and the other end of the current limiting resistor 101 is connected to the D pole of the N-channel depletion-type MOSQ1. The S pole of the N-channel depletion-type MOSQ1 is connected to the first capacitor C1.
[0030] Preferably, the comparison circuit 200 includes a comparator U1 , an output end of the comparator U1 is connected to the shutdown circuit 300 , and the comparator U1 is connected to the first capacitor C1 , and an output signal of the comparator U1 is transmitted to the control power supply charging circuit 100 .
[0031] Preferably, the comparison circuit 200 further includes a reference source 201 , which is connected to the negative input terminal of the comparator U1 . The reference source 201 provides a reference value, which is used to compare with the voltage sampling value of the first capacitor C1 .
[0032] Preferably, the reference source 201 includes a fifth resistor U2 and a three-terminal reference integrated circuit U2, the fifth resistor U2 is connected across the path between the first capacitor C1 and the negative input terminal of the comparator U1; the first terminal U21 and the second terminal U22 of the three-terminal reference integrated circuit U2 are connected to the path between the first capacitor C1 and the negative input terminal of the comparator U1, and the third terminal U23 of the three-terminal reference integrated circuit U2 is connected to the negative electrode of the comparator U1; the reference source 201 is used to provide a reference value, which is used to compare with the voltage sampling value.
[0033] Preferably, the comparison circuit 200 includes an actual voltage sampling circuit 202 , which is connected to the positive electrode of the comparator U1 by means of voltage division; the actual voltage sampling circuit 202 is used to sample the voltage sampling value of the first capacitor C1 .
[0034] Preferably, the actual voltage sampling circuit 202 includes a seventh resistor R7, an eleventh resistor R11 and a third capacitor C3, the seventh resistor R7 is connected in series on the path between the first capacitor C1 and the positive input terminal of the comparator U1, and one end of the eleventh resistor R11 and the third capacitor C3 are both connected to the path between the first capacitor C1 and the positive input terminal of the comparator U1, and the other ends of the eleventh resistor R11 and the third capacitor C3 are both connected to the negative electrode of the comparator U1.
[0035] Preferably, the shutdown circuit 300 includes an N-channel enhancement type MOS Q2, the D pole of the N-channel enhancement type MOS Q2 is connected to the G pole of the N-channel depletion type MOS Q1, the S pole of the N-channel enhancement type MOS Q2 is connected to the negative pole of the comparator U1, and the G pole of the N-channel enhancement type MOS Q2 is connected to the output end of the comparator U1; the shutdown circuit 300 is used to obtain a comparison signal of a reference value and a voltage sampling value and control the shutdown of the power supply charging circuit 100.
[0036] Preferably, the power supply and charging circuit 100 also includes a sixth resistor R6 and a second capacitor C2, one end of the sixth resistor R6 is connected to the S pole of the N-channel depletion type MOS Q1, and the other end of the sixth resistor R6 is connected to the G pole of the N-channel depletion type MOS Q1; one end of the second capacitor C2 is connected to the S pole of the N-channel depletion type MOS Q1, and the other end of the second capacitor C2 is grounded.
[0037] Furthermore, the shutdown circuit 300 also includes an eighth resistor R8, a tenth resistor R10 and a fourth capacitor C4, the eighth resistor R8 is connected in series to the path connecting the G pole of the N-channel enhancement type MOS Q2 and the output end of the comparator U1; the tenth resistor R10 and one end of the fourth capacitor C4 are connected to the path connecting the G pole of the N-channel enhancement type MOS Q2 and the output end of the comparator U1, and the other ends of the tenth resistor R10 and the fourth capacitor C4 are both connected to the negative electrode of the comparator U1.
[0038] It is worth mentioning that when a positive voltage is applied between the G pole and the S pole of the N-channel enhancement MOS, the D pole and the S pole will be conductive.
[0039] In order to facilitate understanding of the technical solution of the utility model, a brief description of its working process is given below:
[0040] Charging mode: During the charging and rising process of the voltage of the first capacitor C1, if the voltage of the first capacitor C1 is lower than 15V, the voltage divider circuit of the seventh resistor R7 and the eleventh resistor R11 connected in parallel at both ends of the first capacitor C1, the voltage distributed to the positive input end of the comparator U1 will be lower than 2.5V. At this time, the potential of the negative input end of the comparator U1 is higher than the positive input end, and the output of the comparator U1 is low 0V, so that the voltage between the G pole and the S pole of the N-channel enhancement type MOSQ2 is 0, and the D pole and the S pole of the N-channel enhancement type MOSQ2 are not turned on, so that the G pole gate of the N-channel depletion type MOSQ1 is in a disconnected state, and the D pole and the S pole of the N-channel depletion type MOSQ1 remain in a turned-on state, and the high voltage continues to charge the first capacitor C1 through the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the D pole and the S pole of the N-channel depletion type MOSQ1;
[0041] Discharge mode: When the voltage across the first capacitor C1 exceeds 15V, the voltage distributed to the positive input terminal of the comparator U1 will be higher than 2.5V. At this time, the potential of the positive input terminal of the comparator U1 is higher than that of the negative input terminal, and the output of the comparator U1 is a high voltage, so that the high voltage between the G pole and the S pole of the N-channel enhancement type MOSQ2 is obtained by dividing the output voltage of the comparator U1 by the eighth resistor R8 and the first resistor R1, and the D pole and the S pole of the N-channel enhancement type MOSQ2 are connected, so that the G pole gate of the N-channel depletion type MOSQ1 is in a state of being connected to GND, and the voltage of the first capacitor C1 will form a negative voltage between the G pole and the S pole of the N-channel depletion type MOSQ1 through the sixth resistor R6, so that the N-channel depletion type MOSQ1 enters the shutdown mode, and the D pole and the S pole of the N-channel depletion type MOSQ1 are in a disconnected state, and the high voltage will stop charging the first capacitor C1, ensuring that the voltage across the first capacitor C1 is stable at 15V, and the first capacitor C1 is in a discharge mode;
[0042] When the voltage across the first capacitor C1 is lower than 15V, charging starts again, and the charging and discharging are repeated in this way to ensure a stable output of 15V voltage.
[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A power supply circuit, characterized in that: include, First capacitor (C1); A power supply and charging circuit (100) connected to a non-grounded end of the first capacitor (C1); A comparison circuit (200) comprising a comparator (U1) and a reference source (201), wherein the comparator (U1) is connected to a non-grounded end of the first capacitor (C1), and the reference source (201) is connected to a negative input end of the comparator (U1); The shutdown circuit (300) comprises an N-channel enhancement type MOS (Q2), wherein the D pole of the N-channel enhancement type MOS (Q2) is connected to the power supply charging circuit (100), the S pole of the N-channel enhancement type MOS (Q2) is connected to the comparator (U1), and the G pole of the N-channel enhancement type MOS (Q2) is connected to the output end of the comparator (U1).
2. The power supply circuit according to claim 1, characterized in that: The power supply and charging circuit (100) comprises a current limiting resistor (101) and an N-channel depletion type MOS (Q1), wherein the current limiting resistor (101) is connected in series with the N-channel depletion type MOS (Q1), one end of the current limiting resistor (101) is connected to a power supply, the other end of the current limiting resistor (101) is connected to a D pole of the N-channel depletion type MOS (Q1), and the S pole of the N-channel depletion type MOS (Q1) is connected to the first capacitor (C1).
3. The power supply circuit according to claim 2, characterized in that: The reference source (201) comprises a fifth resistor (R5), and the fifth resistor (R5) is connected across a path between the first capacitor (C1) and the negative input terminal of the comparator (U1).
4. The power supply circuit according to claim 3, characterized in that: The reference source (201) comprises a three-terminal reference integrated circuit (U2), wherein a first terminal (U21) and a second terminal (U22) of the three-terminal reference integrated circuit (U2) are connected to a path between the first capacitor (C1) and the negative input terminal of the comparator (U1), and a third terminal (U23) of the three-terminal reference integrated circuit (U2) is connected to a negative electrode of the comparator (U1).
5. The power supply circuit according to claim 4, characterized in that: The comparison circuit (200) further comprises an actual voltage sampling circuit (202), wherein the actual voltage sampling circuit (202) is connected to the positive electrode of the comparator (U1) by means of voltage division.
6. The power supply circuit according to claim 5, characterized in that: The actual voltage sampling circuit (202) comprises a seventh resistor (R7), an eleventh resistor (R11) and a third capacitor (C3), wherein the seventh resistor (R7) is connected in series to a path between the first capacitor (C1) and the positive input terminal of the comparator (U1), and one end of each of the eleventh resistor (R11) and the third capacitor (C3) is connected to the path between the first capacitor (C1) and the positive input terminal of the comparator (U1), and the other end of each of the eleventh resistor (R11) and the third capacitor (C3) is connected to a negative electrode of the comparator (U1).
7. The power supply circuit according to claim 5 or 6, characterized in that: The D pole of the N-channel enhancement type MOS (Q2) is connected to the G pole of the N-channel depletion type MOS (Q1).
8. The power supply circuit according to claim 7, characterized in that: The power supply and charging circuit (100) further comprises a sixth resistor (R6), one end of the sixth resistor (R6) being connected to the S pole of the N-channel depletion-type MOS (Q1), and the other end of the sixth resistor (R6) being connected to the G pole of the N-channel depletion-type MOS (Q1).
9. The power supply circuit according to claim 8, characterized in that: The power supply and charging circuit (100) further comprises a second capacitor (C2), one end of the second capacitor (C2) is connected to the S pole of the N-channel depletion-type MOS (Q1), and the other end of the second capacitor (C2) is grounded.
10. The power supply circuit according to claim 9, characterized in that: The shutdown circuit (300) further comprises an eighth resistor (R8), a tenth resistor (R10) and a fourth capacitor (C4); the eighth resistor (R8) is connected in series to a path connecting the G pole of the N-channel enhancement type MOS (Q2) and the output end of the comparator (U1); one end of the tenth resistor (R10) and the fourth capacitor (C4) are connected to the path connecting the G pole of the N-channel enhancement type MOS (Q2) and the output end of the comparator (U1), and the other ends of the tenth resistor (R10) and the fourth capacitor (C4) are both connected to the negative pole of the comparator (U1).