A direct current power supply control circuit and device

Abstract

The application discloses a direct-current power supply control circuit and device, and relates to the technical field of direct-current power supply control circuits, which comprises a voltage stabilizing circuit and a switching circuit, wherein the voltage stabilizing circuit comprises a first resistor, a second resistor and a first voltage stabilizing diode; the first end of the first resistor is connected with the positive pole of a direct-current power supply, the second end is connected with the first end of the second resistor, the second end of the second resistor is connected with the cathode end of the first voltage stabilizing diode, and the anode end of the first voltage stabilizing diode is grounded; the switching circuit comprises a third resistor, a fourth resistor and a MOS tube; the first end of the third resistor is connected with the second end of the first resistor and the D end of the MOS tube, the second end is connected with the G end of the MOS tube, the first end of the fourth resistor is connected with the second end of the third resistor, and the second end is grounded; and the S end of the MOS tube is connected with a load. The application can guarantee that the voltage supplied to the load is in the required range, and can also guarantee the service life of the direct-current power supply.

Description

Technical Field

[0001] This invention relates to the field of DC power supply control circuit technology, and particularly to a DC power supply control circuit and device. Background Technology

[0002] With the rapid development of modern electronic technology, especially the application of electric vehicles, the performance requirements for automotive electronic circuits are becoming increasingly stringent. In existing automotive DC power supply circuits, the DC power supply voltage exhibits significant fluctuations, leading to large output voltage fluctuations and affecting the normal operation of the load. Furthermore, during the process of the DC power supply providing power to the load, the load current also fluctuates considerably, resulting in large current fluctuations in the DC power supply and impacting its lifespan. Summary of the Invention

[0003] This invention provides a DC power supply control circuit and device to solve the technical problems in existing DC power supply circuits where DC power supply voltage fluctuations affect the normal operation of the load and load current fluctuations affect the service life of the DC power supply.

[0004] In a first aspect, a DC power supply control circuit is provided, comprising:

[0005] A voltage regulator circuit, the voltage regulator circuit including a first resistor, a second resistor and a first Zener diode;

[0006] The first end of the first resistor is connected to the positive terminal of the DC power supply, the second end is connected to the first end of the second resistor, the second end of the second resistor is connected to the cathode of the first Zener diode, and the anode of the first Zener diode is grounded.

[0007] A switching circuit, the switching circuit including a third resistor, a fourth resistor and a MOSFET;

[0008] The first end of the third resistor is connected to the second end of the first resistor and the drain (D) end of the MOSFET, and the second end is connected to the gate (G) end of the MOSFET. The first end of the fourth resistor is connected to the second end of the third resistor, and the second end is grounded. The source (S) end of the MOSFET is used to connect to the load.

[0009] In some embodiments, the DC power supply control circuit further includes:

[0010] A pre-stage filter circuit is located between the DC power supply and the voltage regulator circuit.

[0011] In some embodiments, the pre-stage filter circuit includes:

[0012] The first capacitor has its first terminal connected to the positive terminal of the DC power supply and its second terminal grounded.

[0013] The second capacitor has its first terminal connected to the positive terminal of the DC power supply and its second terminal grounded.

[0014] In some embodiments, the DC power supply control circuit further includes:

[0015] The first diode has its anode connected to the positive terminal of a DC power supply and its second terminal connected to the first terminal of the first capacitor.

[0016] In some embodiments, the DC power supply control circuit further includes:

[0017] A post-stage filter circuit is located between the switching circuit and the load.

[0018] In some embodiments, the subsequent stage filtering circuit includes:

[0019] The third capacitor has its first terminal connected to the source terminal (S) of the MOS transistor and its second terminal grounded.

[0020] The fourth capacitor has its first terminal connected to the source (S) terminal of the MOS transistor and its second terminal grounded.

[0021] In some embodiments, both the first capacitor and the third capacitor are electrolytic capacitors.

[0022] In some embodiments, the DC power supply control circuit further includes:

[0023] The second Zener diode has its cathode connected to the second terminal of the fourth resistor, and its anode grounded.

[0024] In some embodiments, the DC power supply control circuit further includes:

[0025] The fifth capacitor has its first terminal connected to the gate (G) terminal of the MOS transistor and its second terminal grounded.

[0026] Secondly, a power control device is provided, including the aforementioned DC power control circuit.

[0027] The beneficial effects of the technical solution provided by this invention include:

[0028] This invention provides a DC power supply control circuit and device, which includes a voltage regulator circuit and a switching circuit. The voltage regulator circuit includes a first Zener diode, whose voltage regulation characteristics control the output voltage of the DC power supply within a specific range. Even if the DC power supply voltage fluctuates, it minimizes the impact on the voltage supplied to the load, ensuring the load operates normally. The switching circuit includes a MOSFET, whose drain (D) and source (S) terminals are connected to the DC power supply and the load, respectively. When the load current fluctuates, it minimizes the impact on the output current of the DC power supply, ensuring the lifespan of the DC power supply. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a DC power supply control circuit provided in an embodiment of the present invention.

[0031] Figure 2 A circuit diagram of a DC power supply control circuit provided in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] This invention provides a DC power supply control circuit that can solve the technical problems in existing DC power supply circuits where DC power supply voltage fluctuations affect the normal operation of the load and load current fluctuations affect the service life of the DC power supply.

[0034] See Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a DC power supply control circuit, including a voltage regulator circuit and a switching circuit.

[0035] The voltage regulator circuit includes a first resistor R1, a second resistor R2, and a first Zener diode D1. The first terminal of the first resistor R1 is connected to the positive terminal of the DC power supply, and the second terminal is connected to the first terminal of the second resistor R2. The second terminal of the second resistor R2 is connected to the cathode of the first Zener diode D1, and the anode of the first Zener diode D1 is grounded.

[0036] The switching circuit includes a third resistor R3, a fourth resistor R4, and a MOSFET U1. The first end of the third resistor R3 is connected to the second end of the first resistor R3 and the drain (D) end of the MOSFET U1, and the second end is connected to the gate (G) end of the MOSFET U1. The first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and the second end is grounded. The source (S) end of the MOSFET U1 is used to connect to the load.

[0037] Specifically, the DC power supply is input at the positive terminal Vin, with a typical Vin voltage of 24V. After passing through the first resistor R1, and then through the first resistor R2 and the first Zener diode D1, the voltage across the first resistor R1 is suppressed within the characteristic voltage regulation range of the first Zener diode D1 due to its voltage regulation characteristics. The first Zener diode D1 is typically rated at 16V, with an effective voltage regulation range of Vmin: 15.3V / Vnom: 16.0V / Vmax: 17.2V. The first resistor R1 mitigates the voltage and current surges of the input voltage on the subsequent switching circuit. Its resistance is typically around 20Ω, with a power rating of approximately 1 / 2W or 1W. When the Vin voltage experiences a sharp rise, it effectively suppresses the impact of voltage fluctuations, acting as a buffer.

[0038] Furthermore, the input voltage at the drain (D) terminal of the MOSFET U1 is limited to the range of 15.3V to 17.2V. Optionally, the MOSFET U1 can be an N-type MOSFET. The voltage at the downstream end of the first resistor R1 is output to the gate (G) terminal of the MOSFET U1 through the resistor R3. When the gate terminal of the MOSFET U1 is set to a high level, the MOSFET U1 is in the conducting state. The voltage at the drain terminal of the MOSFET U1 is transferred to the source (S) terminal of the MOSFET U1 and finally output to the Vout terminal to supply power to the load. In addition, when the load current fluctuates, due to the inherent characteristics of the MOSFET U1, the load current fluctuation will not affect the DC power supply before the switching circuit, ensuring the service life of the DC power supply.

[0039] The DC power supply control circuit in this embodiment of the invention includes a voltage regulator circuit and a switching circuit. The voltage regulator circuit includes a first Zener diode, whose voltage regulation characteristics can control the output voltage of the DC power supply within a specific required range. Even if the DC power supply voltage fluctuates, it minimizes the impact on the voltage supplied to the load, ensuring the load operates normally. The switching circuit includes a MOSFET, whose drain (D) and source (S) terminals are connected to the DC power supply and the load, respectively. When the load current fluctuates, it minimizes the impact on the output current of the DC power supply, ensuring the lifespan of the DC power supply.

[0040] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the DC power supply control circuit further includes a pre-stage filter circuit, which is located between the DC power supply and the voltage regulator circuit. The pre-stage filter circuit filters the voltage output from the DC power supply and outputs it to the voltage regulator circuit, minimizing the AC component in the pulsating DC voltage, suppressing multi-frequency noise to a certain extent, retaining its DC component, reducing the output voltage ripple coefficient, and making the voltage output to the voltage regulator circuit smoother.

[0041] Further, see Figure 2 As shown, the pre-stage filter circuit includes a first capacitor C1 and a second capacitor C2. The first terminal of the first capacitor C1 is connected to the positive terminal of the DC power supply, and the second terminal is grounded. The first terminal of the second capacitor C2 is connected to the positive terminal of the DC power supply, and the second terminal is grounded. Optionally, the first capacitor C1 is an electrolytic capacitor, which has a very large capacitance per unit volume, strong withstand capability against high ripple voltage, and low cost.

[0042] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the DC power supply control circuit further includes: a first diode D2, the anode of the first diode D2 is connected to the positive terminal of the DC power supply, and the second terminal is connected to the first terminal of the first capacitor C1, to ensure the normal flow of current and avoid directional voltage surges.

[0043] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the DC power supply control circuit further includes a post-stage filter circuit, which is located between the switching circuit and the load. The post-stage filter circuit filters the voltage output from the switching circuit before outputting it to the load, minimizing the AC component in the pulsating DC voltage while retaining its DC component, thus reducing the output voltage ripple coefficient and making the output voltage to the load smoother.

[0044] Further, see Figure 2As shown, the subsequent filter circuit includes a third capacitor C3 and a fourth capacitor C4. The first terminal of the third capacitor is connected to the source (S) terminal of the MOSFET, and the second terminal is grounded. The first terminal of the fourth capacitor is connected to the source (S) terminal of the MOSFET, and the second terminal is grounded. Optionally, the third capacitor C3 is an electrolytic capacitor, which has a very large capacitance per unit volume, strong ability to withstand large ripple voltages, and low cost.

[0045] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the DC power supply control circuit further includes a second Zener diode D3. The cathode of the second Zener diode D3 is connected to the second terminal of the fourth resistor R4, and the anode of the second Zener diode D3 is grounded. The parameters of the second Zener diode D3 can be the same as those of the first Zener diode D1. On the one hand, the second Zener diode D3 can stabilize the voltage at the gate (G) terminal of the MOSFET U1, preventing the voltage at the G terminal of the MOSFET U1 from becoming too high. On the other hand, when the first Zener diode D1 fails, the second Zener diode D3 also provides a certain degree of redundancy protection, ensuring that the voltage at the drain (D) terminal of the MOSFET U1 is within the required range.

[0046] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the DC power supply control circuit further includes a fifth capacitor C5, the first end of which is connected to the gate (G) terminal of the MOSFET U1, and the second end is grounded. The fifth capacitor C5 can filter out multi-band noise voltage at the gate terminal of the MOSFET U1, ensuring the normal operation of the MOSFET U1.

[0047] This invention provides a self-stabilizing holding device, including the aforementioned DC power supply control circuit. See also... Figure 1 and Figure 2 As shown, the DC power supply control circuit includes a voltage regulator circuit and a switching circuit.

[0048] The voltage regulator circuit includes a first resistor R1, a second resistor R2, and a first Zener diode D1. The first terminal of the first resistor R1 is connected to the positive terminal of the DC power supply, and the second terminal is connected to the first terminal of the second resistor R2. The second terminal of the second resistor R2 is connected to the cathode of the first Zener diode D1, and the anode of the first Zener diode D1 is grounded.

[0049] The switching circuit includes a third resistor R3, a fourth resistor R4, and a MOSFET U1. The first end of the third resistor R3 is connected to the second end of the first resistor R3 and the drain (D) end of the MOSFET, and the second end is connected to the gate (G) end of the MOSFET U1. The first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and the second end is grounded. The source (S) end of the MOSFET U1 is used to connect to the load.

[0050] Specifically, the DC power supply is input at the positive terminal Vin, with a typical Vin voltage of 24V. After passing through the first resistor R1, and then through the first resistor R2 and the first Zener diode D1, the voltage across the first resistor R1 is suppressed within the characteristic voltage regulation range of the first Zener diode D1 due to its voltage regulation characteristics. The first Zener diode D1 is typically rated at 16V, with an effective voltage regulation range of Vmin: 15.3V / Vnom: 16.0V / Vmax: 17.2V. The first resistor R1 mitigates the voltage and current surges of the input voltage on the subsequent switching circuit. Its resistance is typically around 20Ω, with a power rating of approximately 1 / 2W or 1W. When the Vin voltage experiences a sharp rise, it effectively suppresses the impact of voltage fluctuations, acting as a buffer.

[0051] Furthermore, the input voltage at the drain (D) terminal of the MOSFET U1 is limited to the range of 15.3V to 17.2V. Optionally, the MOSFET U1 can be an N-type MOSFET. The voltage at the downstream end of the first resistor R1 is output to the gate (G) terminal of the MOSFET U1 through the resistor R3. When the gate terminal of the MOSFET U1 is set to a high level, the MOSFET U1 is in the conducting state. The voltage at the drain terminal of the MOSFET U1 is transferred to the source (S) terminal of the MOSFET U1 and finally output to the Vout terminal to supply power to the load. In addition, when the load current fluctuates, due to the inherent characteristics of the MOSFET U1, the load current fluctuation will not affect the DC power supply before the switching circuit, ensuring the service life of the DC power supply.

[0052] The DC power supply control device in this embodiment of the invention includes a voltage regulator circuit and a switching circuit. The voltage regulator circuit includes a first Zener diode, whose voltage regulation characteristics can control the output voltage of the DC power supply within a specific required range. Even if the DC power supply voltage fluctuates, it minimizes the impact on the voltage supplied to the load, ensuring the load operates normally. The switching circuit includes a MOSFET, whose drain (D) and source (S) terminals are connected to the DC power supply and the load, respectively. When the load current fluctuates, it minimizes the impact on the output current of the DC power supply, ensuring the lifespan of the DC power supply.

[0053] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the DC power supply control circuit further includes a pre-stage filter circuit, which is located between the DC power supply and the voltage regulator circuit. The pre-stage filter circuit filters the voltage output from the DC power supply and outputs it to the voltage regulator circuit, minimizing the AC component in the pulsating DC voltage, suppressing multi-frequency noise to a certain extent, retaining its DC component, reducing the output voltage ripple coefficient, and making the voltage output to the voltage regulator circuit smoother.

[0054] Further, see Figure 2 As shown, the pre-stage filter circuit includes a first capacitor C1 and a second capacitor C2. The first terminal of the first capacitor C1 is connected to the positive terminal of the DC power supply, and the second terminal is grounded. The first terminal of the second capacitor C2 is connected to the positive terminal of the DC power supply, and the second terminal is grounded. Optionally, the first capacitor C1 is an electrolytic capacitor, which has a very large capacitance per unit volume, strong withstand capability against high ripple voltage, and low cost.

[0055] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the DC power supply control circuit further includes: a first diode D2, the anode of the first diode D2 is connected to the positive terminal of the DC power supply, and the second terminal is connected to the first terminal of the first capacitor C1, to ensure the normal flow of current and avoid reverse voltage surges.

[0056] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 1 As shown, the DC power supply control circuit further includes a post-stage filter circuit, which is located between the switching circuit and the load. The post-stage filter circuit filters the voltage output from the switching circuit before outputting it to the load, minimizing the AC component in the pulsating DC voltage while retaining its DC component, thus reducing the output voltage ripple coefficient and making the output voltage to the load smoother.

[0057] Further, see Figure 2 As shown, the subsequent filter circuit includes a third capacitor C3 and a fourth capacitor C4. The first terminal of the third capacitor is connected to the source (S) terminal of the MOSFET, and the second terminal is grounded. The first terminal of the fourth capacitor is connected to the source (S) terminal of the MOSFET, and the second terminal is grounded. Optionally, the third capacitor C3 is an electrolytic capacitor, which has a very large capacitance per unit volume, strong ability to withstand large ripple voltages, and low cost.

[0058] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2As shown, the DC power supply control circuit further includes a second Zener diode D3. The cathode of the second Zener diode D3 is connected to the second terminal of the fourth resistor R4, and the anode of the second Zener diode D3 is grounded. The parameters of the second Zener diode D3 can be the same as those of the first Zener diode D1. On the one hand, the second Zener diode D3 can stabilize the voltage at the gate (G) terminal of the MOSFET U1, preventing the voltage at the G terminal of the MOSFET U1 from becoming too high. On the other hand, when the first Zener diode D1 fails, the second Zener diode D3 also provides a certain degree of redundancy protection, ensuring that the voltage at the drain (D) terminal of the MOSFET U1 is within the required range.

[0059] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the DC power supply control circuit further includes a fifth capacitor C5, the first end of which is connected to the gate (G) terminal of the MOSFET U1, and the second end is grounded. The fifth capacitor C5 can filter out noise voltage at the gate (G) terminal of the MOSFET U1, ensuring the normal operation of the MOSFET U1.

[0060] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0061] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0062] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A DC power supply control circuit, characterized in that, include: A voltage regulator circuit, the voltage regulator circuit including a first resistor, a second resistor and a first Zener diode; The first end of the first resistor is connected to the positive terminal of the DC power supply, the second end is connected to the first end of the second resistor, the second end of the second resistor is connected to the cathode of the first Zener diode, and the anode of the first Zener diode is grounded. A switching circuit, the switching circuit including a third resistor, a fourth resistor and a MOSFET; The first end of the third resistor is connected to the second end of the first resistor and the D end of the MOS transistor, and the second end is connected to the G end of the MOS transistor. The first end of the fourth resistor is connected to the second end of the third resistor, and the second end is grounded. The S end of the MOS transistor is used to connect to the load. A pre-stage filter circuit is located between the DC power supply and the voltage regulator circuit; A post-stage filter circuit is provided between the switching circuit and the load; The second Zener diode has its cathode connected to the second terminal of the fourth resistor, and its anode grounded.

2. The DC power supply control circuit as described in claim 1, characterized in that, The pre-stage filter circuit includes: The first capacitor has its first terminal connected to the positive terminal of the DC power supply and its second terminal grounded. The second capacitor has its first terminal connected to the positive terminal of the DC power supply and its second terminal grounded.

3. The DC power supply control circuit as described in claim 2, characterized in that, Also includes: The first diode has its anode connected to the positive terminal of a DC power supply and its second terminal connected to the first terminal of the first capacitor.

4. The DC power supply control circuit as described in claim 2, characterized in that, The subsequent filtering circuit includes: The third capacitor has its first terminal connected to the source terminal (S) of the MOS transistor and its second terminal grounded. The fourth capacitor has its first terminal connected to the source (S) terminal of the MOS transistor and its second terminal grounded.

5. The DC power supply control circuit as described in claim 4, characterized in that: Both the first capacitor and the third capacitor are electrolytic capacitors.

6. The DC power supply control circuit as described in claim 1, characterized in that, Also includes: The fifth capacitor has its first terminal connected to the gate (G) terminal of the MOS transistor and its second terminal grounded.

7. A DC power supply control device, characterized in that, Includes the DC power supply control circuit as described in any one of claims 1-6.

Images