DC-DC power supply device for CPU
The synchronous start of the RUN/SS pin is controlled through a two-stage DC-DC converter and the PGOOD pin, which solves the timing disorder caused by the deviation of capacitance capacitance, and realizes the stability and fault protection of CPU power supply.
Patent Information
- Application Number
- CN202420846784.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-22
AI Technical Summary
When the existing DC-DC power supply is powered by the CPU, the deviation of the capacitance value leads to a disordered timing, and a larger capacitor is configured to extend the startup time, which affects the stability of the power supply.
The two-stage DC-DC converter is adopted and the start timing of the RUN/SS pin is forced to control the start timing of the RUN/SS pin through the PGOOD pin to ensure the synchronous start of the two converters and avoid timing disorders.
It effectively avoids the disorder of the CPU's voltage acceptance timing, ensures the stability of power supply, and automatically stops the other converter when one converter fails, preventing CPU damage.
Smart Images
Figure CN222215522U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply, and more specifically to a DC-DC power supply device for a CPU. Background Art
[0002] DC-DC power supply refers to direct current to direct current power supply, which is a device that converts electrical energy of one voltage value into electrical energy of another voltage value. It is usually used to adjust the voltage and current of DC power supply to meet the needs of different equipment.
[0003] The working principle of DC-DC power supply is mainly based on the conversion and voltage regulation of DC current. Specifically, the input DC voltage is first filtered and stabilized by the input filter circuit to remove the ripple and noise in the voltage to ensure the stable operation of the subsequent circuit. Then, the power is converted by the switching power supply, and finally the stable output DC voltage is obtained by the output filter circuit. The DC-DC circuit has a high voltage conversion rate and a large output current, and can drive a variety of loads, including high-power loads such as motors and LEDs.
[0004] When using a DC-DC power supply to power the CPU, some CPUs have certain requirements for the timing of power supply. For example, the CPU's VIN1 requires a 12V power supply, and VIN2 requires a 5V power supply. The CPU requires that the 12V power supply of VIN1 be connected to the CPU first, and then the 5V power supply of VIN2 be connected to the CPU. The existing method is generally to use a capacitor to configure the RUN / SS end of the DC-DC power supply. There is a pull-up current inside the RUN / SS pin of the DC-DC power supply. After the capacitor is connected, the current charges the capacitor. After the charge reaches the start-up voltage, the DC-DC power supply starts working, and the output voltage is the voltage set by the resistor on the VOset pin. By changing the capacitance value of the RUN / SS pin, the start-up time of the DC-DC power supply can be adjusted. For example, if a 100pF capacitor is configured, the start-up time of the DC-DC power supply is 200ms. If the pin is left floating, the start-up time is 50ms. If a 500pF capacitor is configured, the start-up time is 400ms.
[0005] However, since the capacitance of the capacitor may vary by 20%, and different DC-DC power supplies have different sensitivities to the capacitor, the timing of the power supply to the CPU may be disrupted. And configuring a larger capacitor will extend the overall startup time of the board. Utility Model Content
[0006] In view of the problems existing in the prior art, the purpose of the utility model is to provide a DC-DC power supply device for a CPU, which effectively avoids the disorder of the timing of the CPU receiving voltage and ensures the stability of power supply.
[0007] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:
[0008] A DC-DC power supply device for a CPU comprises: a first DC-DC converter and a second DC-DC converter, wherein the first DC-DC converter and the second DC-DC converter are electrically connected to a DC power supply through a power supply circuit respectively, and the first DC-DC converter and the second DC-DC converter are signal-connected through a signal transmission circuit; the first DC-DC converter is connected to a first input terminal of the CPU through a first output circuit, and the second DC-DC converter is connected to a second input terminal of the CPU through a second output circuit.
[0009] Furthermore, the power supply circuit includes: the positive electrode of the direct current power supply DC is respectively connected to one end of the capacitor C1, one end of the capacitor C4, the VIN pin of the first DC-DC converter U1, and the VIN pin of the second DC-DC converter U2; the other end of the capacitor C1, the SGND pin of the first DC-DC converter U1, the PGND pin of the first DC-DC converter U1, and the negative electrode of the direct current power supply DC are respectively grounded; the other end of the capacitor C4, the SGND pin of the second DC-DC converter U2, and the PGND pin of the second DC-DC converter U2 are respectively grounded.
[0010] Furthermore, the signal transmission circuit includes: a PGOOD pin of the first DC-DC converter U1 is connected to a RUN / SS pin of the second DC-DC converter U2 via a resistor R2.
[0011] Further, the first output circuit includes: a VOUT pin of the first DC-DC converter U1 is respectively connected to one end of a capacitor C2 and a VIN1 pin of the CPU, and the other end of the capacitor C2 is grounded; a VOSET pin of the first DC-DC converter U1 is grounded through a resistor R1; and a RUN / SS pin of the first DC-DC converter U1 is grounded through a capacitor C3.
[0012] Furthermore, the second output circuit includes: a VOUT pin of the second DC-DC converter U2 is connected to one end of the capacitor C5 and the VIN2 pin of the CPU respectively, and the other end of the capacitor C5 is grounded; a VOSET pin of the second DC-DC converter U2 is grounded through a resistor R3.
[0013] Furthermore, the first DC-DC converter and the second DC-DC converter both use a DC-DC converter of model LTM4600.
[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model discloses a DC-DC power supply device for a CPU, which avoids the disorder of the timing of the CPU receiving voltage by forcibly fixing the startup timing of the two DC-DC converters. After using the utility model, when the first DC-DC converter fails, the second DC-DC converter may automatically stop forcibly, avoiding the CPU only receiving the voltage output by the second DC-DC converter, causing the CPU to fail or be damaged.
[0015] It can be seen that compared with the prior art, the utility model has substantial characteristics and progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0017] Figure 1 It is a circuit schematic diagram of the utility model. DETAILED DESCRIPTION
[0018] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.
[0019] like Figure 1 A DC-DC power supply device for a CPU is shown, comprising: a first DC-DC converter and a second DC-DC converter, the first DC-DC converter and the second DC-DC converter are electrically connected to a DC power supply through a power supply circuit respectively, and the first DC-DC converter and the second DC-DC converter are signal-connected through a signal transmission circuit; the first DC-DC converter is connected to a first input terminal of the CPU through a first output circuit, and the second DC-DC converter is connected to a second input terminal of the CPU through a second output circuit. The first DC-DC converter and the second DC-DC converter are both LTM4600 DC-DC converters.
[0020] In a specific implementation, the power supply circuit, the signal transmission circuit signal, the first output circuit and the second output circuit can be used as the power supply control circuit of the utility model to provide power supply and timing control for the CPU.
[0021] As an example, the power supply control circuit includes:
[0022] The positive electrode of the DC power supply DC is respectively connected to one end of the capacitor C1, one end of the capacitor C4, the VIN pin of the first DC-DC converter U1, and the VIN pin of the second DC-DC converter U2; the other end of the capacitor C1, the SGND pin of the first DC-DC converter U1, the PGND pin of the first DC-DC converter U1, and the negative electrode of the DC power supply DC are respectively grounded; the other end of the capacitor C4, the SGND pin of the second DC-DC converter U2, and the PGND pin of the second DC-DC converter U2 are respectively grounded. The PGOOD pin of the first DC-DC converter U1 is connected to the RUN / SS pin of the second DC-DC converter U2 through the resistor R2. The VOUT pin of the first DC-DC converter U1 is respectively connected to one end of the capacitor C2 and the VIN1 pin of the CPU, and the other end of the capacitor C2 is grounded; the VOSET pin of the first DC-DC converter U1 is grounded through the resistor R1; the RUN / SS pin of the first DC-DC converter U1 is grounded through the capacitor C3. The VOUT pin of the second DC-DC converter U2 is connected to one end of the capacitor C5 and the VIN2 pin of the CPU respectively, and the other end of the capacitor C5 is grounded; the VOSET pin of the second DC-DC converter U2 is grounded through the resistor R3, and the GND pin of the CPU is grounded.
[0023] When the DC-DC converter is in use, the RUN / SS pin needs to reach a certain voltage value before the DC-DC converter starts. When in use, there is a PGOOD pin on the first DC-DC converter U1, which is used to detect whether the power supply is working properly. When the output voltage of the first DC-DC converter U1 is the voltage set by the VOSET pin, the voltage of its PGOOD pin is generally 5V. When the output voltage of the first DC-DC converter U1 deviates from the set value by 10%, the voltage of its PGOOD pin will be forced to be pulled down to ground, and the voltage of the RUN / SS pin of the second DC-DC converter is 0, and the second DC-DC converter does not work. Therefore, the device connects the PGOOD pin of the first DC-DC converter U1 to the RUN / SS pin of the second DC-DC converter U2. When the first DC-DC converter U1 is started and the voltage is output normally, the RUN / SS pin of the second DC-DC converter U2 will have voltage, and the second DC-DC converter U2 will start.
[0024] Through the above design, the utility model effectively avoids the disorder of the timing of the CPU receiving voltage and ensures the stability of power supply.
[0025] The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by this application.
Claims
1. A DC-DC power supply device for a CPU, characterized in that: include: a first DC-DC converter and a second DC-DC converter, the first DC-DC converter and the second DC-DC converter are electrically connected to a DC power supply through a power supply circuit, respectively, and the first DC-DC converter and the second DC-DC converter are signal-connected through a signal transmission circuit; The first DC-DC converter is connected to a first input terminal of the CPU via a first output circuit, and the second DC-DC converter is connected to a second input terminal of the CPU via a second output circuit.
2. The DC-DC power supply device for CPU according to claim 1, characterized in that: The power supply circuit comprises: The positive electrode of the direct current power supply DC is respectively connected to one end of the capacitor C1, one end of the capacitor C4, the VIN pin of the first DC-DC converter U1, and the VIN pin of the second DC-DC converter U2; the other end of the capacitor C1, the SGND pin of the first DC-DC converter U1, the PGND pin of the first DC-DC converter U1, and the negative electrode of the direct current power supply DC are respectively grounded; the other end of the capacitor C4, the SGND pin of the second DC-DC converter U2, and the PGND pin of the second DC-DC converter U2 are respectively grounded.
3. The DC-DC power supply device for CPU according to claim 2, characterized in that: The signal transmission circuit comprises: The PGOOD pin of the first DC-DC converter U1 is connected to the RUN / SS pin of the second DC-DC converter U2 through the resistor R2.
4. The DC-DC power supply device for CPU according to claim 3, characterized in that: The first output circuit shown comprises: The VOUT pin of the first DC-DC converter U1 is connected to one end of the capacitor C2 and the VIN1 pin of the CPU respectively, and the other end of the capacitor C2 is grounded; the VOSET pin of the first DC-DC converter U1 is grounded through the resistor R1; the RUN / SS pin of the first DC-DC converter U1 is grounded through the capacitor C3.
5. The DC-DC power supply device for CPU according to claim 4, characterized in that: The second output circuit comprises: The VOUT pin of the second DC-DC converter U2 is connected to one end of the capacitor C5 and the VIN2 pin of the CPU respectively, and the other end of the capacitor C5 is grounded; the VOSET pin of the second DC-DC converter U2 is grounded through the resistor R3.
6. The DC-DC power supply device for CPU according to claim 1, characterized in that: The first DC-DC converter and the second DC-DC converter are both LTM4600 DC-DC converters.