Power supply driving direct connection device for DC-DC conversion circuit and PD power supply
By introducing a pass-through NMOS tube and a charge pump driver module into the DC-DC conversion circuit, the problem that the pass-through NMOS tube cannot be quickly turned off in the pass-through mode is solved, efficient pass-through control and fault protection are achieved, and the safety and efficiency of the system are improved.
Patent Information
- Application Number
- CN202422266135.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-09-14
AI Technical Summary
In a DC/DC converter, the pass-through mode cannot quickly shut down the pass-through NMOS transistor, resulting in the inability to cut off the power supply in time when a system fault occurs, affecting system efficiency and safety.
Adopting the straight-through NMOS tube Q1, straight-through drive module and output switch module, the signal of the output switch module is driven by the charge pump inside the protocol circuit to control the conduction and disconnection of the straight-through NMOS tube, and the design of resistors and capacitors is combined to achieve fast response.
The fast turn-on and turn-off of the pass-through NMOS tube in the pass-through mode is achieved, which improves the efficiency and safety of the system and ensures that the power supply can be quickly cut off in the event of a fault to prevent heat accumulation.
Smart Images
Figure CN223348546U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power supply circuits, and in particular to a power supply drive pass-through device for a DC-DC conversion circuit. Background Art
[0002] Due to the improvement in the self-regulation of PD power supply compared to traditional USB power supply, it has the following advantages: diversified output configuration (for example, diversified customization, diversified combination, etc.); wide dynamic output voltage (for example, 3.3-48V output is continuously adjustable); output current up to 5A.
[0003] Since PD power supplies typically use an AC / DC+DC / DC topology, the DC / DC converter inevitably generates heat and energy efficiency losses during the power conversion process, especially at high power levels. To improve overall efficiency and reduce power loss, the DC / DC converter can use pass-through mode or other optimization methods in high-power applications to minimize unnecessary energy efficiency losses.
[0004] Given the diversity of outputs, most power supply topologies are AC / DC+DC / DC (one or more), and the addition of a DC / DC stage further reduces efficiency. The maximum output current is generally 3A-5A, so the higher the output voltage, the greater the output power, and the greater the heat generation power. Therefore, DC / DC hopes to be directly connected at high power levels to improve overall efficiency. When in use, a direct-pass NMOS can be connected between the input and output terminals to switch to the direct-pass mode according to the control of the direct-pass signal. However, in the event of a system failure, this direct-pass method cannot quickly shut down the direct-pass NMOS.
[0005] Based on this, a new solution is needed. Utility Model Content
[0006] The main purpose of the utility model is to provide a power supply drive pass-through device for a DC-DC conversion circuit.
[0007] To achieve the above-mentioned object, the present invention provides a power supply drive pass-through device for a DC-DC conversion circuit, comprising a pass-through NMOS tube Q1, a pass-through drive module, and an output switch module, wherein the input end of the pass-through NMOS tube Q1 is connected to the output end of the input module, the output end of the pass-through NMOS tube Q1 is connected to the input end of the output module, the first input end of the pass-through drive module is connected to a pass-through signal, the output end of the protocol circuit is connected to the second input end of the pass-through drive module and the control end of the output switch module, the output end of the pass-through drive module is connected to the control end of the pass-through NMOS tube Q1, and the input end of the output switch module is connected to the output end of the DC-DC conversion circuit. The output end of the output switch module is connected to the input end of the output module, and the signal of the output switch module is driven by the charge pump integrated in the protocol circuit. After the through-drive module receives the through-start signal, the through-drive module connects the power supply of the charge pump to the through-NMOS transistor Q1 through the signal of the output switch module to turn on the through-NMOS transistor Q1. The through-NMOS transistor Q1 turns on the input module and the output module under the control of the through-start signal; after the through-drive module receives the through-stop signal, the through-NMOS transistor Q1 disconnects the input module and the output module under the control of the through-stop signal.
[0008] In the power supply drive pass-through device for a DC-DC conversion circuit provided by the present invention, the output switch module is a fourth NMOS transistor Q4, the gate of the fourth NMOS transistor Q4 is connected to the protocol circuit, the drain of the fourth NMOS transistor Q4 is connected to the drain of the pass-through NMOS transistor Q1, and the source of the fourth NMOS transistor Q4 is connected to the output end of the DC-DC conversion circuit.
[0009] In the power supply drive pass-through device for a DC-DC conversion circuit provided by the present invention, the pass-through drive module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a second field effect transistor Q2 and a third field effect transistor Q3, the gate of the second field effect transistor Q2 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the drain of the second field effect transistor Q2 is connected to the second end of the second resistor R2, the first end of the first resistor R1, the drain of the fourth NMOS transistor Q4 and the drain of the pass-through NMOS transistor Q1, and the source of the second field effect transistor Q2 is connected to the first end of the second resistor R2, the first end of the first resistor R1, the drain of the fourth NMOS transistor Q4 and the drain of the pass-through NMOS transistor Q1. a second end of a resistor R1, a gate of the through-NMOS transistor Q1, and a drain of the third field-effect transistor Q3; a gate of the third field-effect transistor Q3 is connected to a first end of the fourth resistor R4, a first end of the fifth resistor R5, and a first end of the first capacitor C1; a source of the third field-effect transistor Q3 is connected to a second end of the fourth resistor R4 and a gate of the fourth NMOS transistor Q4; a second end of the third resistor R3 is connected to a first end of the second capacitor C2; a second end of the second capacitor C2 is connected to a second end of the fifth resistor R5, a second end of the first capacitor C1, and a first end of the sixth resistor R6; and a second end of the sixth resistor R6 is connected to the source of the fourth NMOS transistor Q4.
[0010] According to another aspect of the present invention, a PD power supply is further provided, comprising the power supply drive pass-through device for the DC-DC conversion circuit as described above.
[0011] The power supply drive pass-through device for a DC-DC conversion circuit provided by the utility model has the following beneficial effects: the power supply drive pass-through device for a DC-DC conversion circuit provided by the utility model drives the signal of the output switch module through the charge pump integrated in the protocol circuit. After the pass-through drive module receives the pass-through start signal, the pass-through drive module connects the power supply of the charge pump to the pass-through NMOS transistor Q1 through the signal of the output switch module to turn on the pass-through NMOS transistor Q1. The pass-through NMOS transistor Q1 connects the input module and the output module under the control of the pass-through start signal; after the pass-through drive module receives the pass-through stop signal, the pass-through NMOS transistor Q1 disconnects the input module and the output module under the control of the pass-through stop signal; thus, the output switch module is driven by the charge pump integrated in the protocol circuit, and power is supplied by the charge pump of the protocol circuit. When the pass-through drive module receives the pass-through start signal, the power supply is connected to the pass-through NMOS, thereby turning on the pass-through NMOS; when a fault occurs, the protection function of the protocol circuit can simultaneously and quickly shut down the pass-through NMOS by cutting off the power supply. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can obtain other drawings based on the provided drawings without inventive work.
[0013] Figure 1 FIG2 is a schematic diagram of a power supply drive pass-through device for a DC-DC conversion circuit provided by an embodiment of the present invention;
[0014] Figure 2 Shown is a circuit diagram of a power supply drive pass-through device for a DC-DC conversion circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0015] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.
[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0017] Figure 1 The figure shows a schematic diagram of a power supply drive pass-through device for a DC-DC conversion circuit provided by an embodiment of the present invention. Figure 1 As shown, the power supply drive pass-through device provided by the present invention is connected to the DC-DC conversion circuit 30, wherein the DC-DC conversion circuit 30 is connected between the input module 10 and the output module 20, that is, the input pin of the DC-DC conversion circuit 30 is connected to the input module 10, and the output pin is connected to the output module 20, for converting the input voltage into DC-DC and outputting it to the output module 20 for use by the load. Figure 1 As shown, the output module 20 is also connected to the protocol circuit 40 , that is, the input end of the protocol circuit 40 is connected to the output module 20 .
[0018] Reference Figure 1The power supply drive pass-through device for a DC-DC conversion circuit provided by the present invention includes a pass-through NMOS transistor Q1, a pass-through driver module 50, and an output switch module 60. The input end of the pass-through NMOS transistor Q1 is connected to the output end of the input module 10, the output end of the pass-through NMOS transistor Q1 is connected to the input end of the output module 20, the first input end of the pass-through driver module 50 is connected to a pass-through signal, the output end of the protocol circuit 40 is connected to the second input end of the pass-through driver module 50 and the control end of the output switch module 60, the output end of the pass-through driver module 50 is connected to the control end of the pass-through NMOS transistor Q1, the input end of the output switch module 60 is connected to the output end of the DC-DC conversion circuit 30, and the output end of the output switch module 60 is connected to the input end of the output module 20. During use, the power supply is connected to the straight-through NMOS tube Q1 through the signal of the charge pump integrated in the protocol circuit 40 to drive the output switch module 60. After the straight-through driving module 50 receives the straight-through start signal, the straight-through driving module 50 connects the power supply of the charge pump to the straight-through NMOS tube Q1 through the signal of the output switch module 60 to turn on the straight-through NMOS tube Q1. The straight-through NMOS tube Q1 turns on the input module 10 and the output module 20 under the control of the straight-through start signal; after the straight-through driving module 50 receives the straight-through close signal, the straight-through NMOS tube Q1 disconnects the input module 10 and the output module 20 under the control of the straight-through close signal.
[0019] In the power supply drive pass-through device for a DC-DC converter circuit provided by this utility model, power is provided by a charge pump integrated within the protocol circuit, driving a signal from an output switching module. Upon receiving a pass-through enable signal, the pass-through driver module connects this power supply to the pass-through NMOS, thereby turning on the pass-through NMOS. In the event of a fault, the protocol circuit's protection function can simultaneously and quickly shut down the pass-through NMOS by cutting off power.
[0020] Figure 2 The figure shows a circuit diagram of a power supply drive pass-through device for a DC-DC conversion circuit provided by an embodiment of the present invention. Figure 2 As shown, the output switch module 60 is a fourth NMOS transistor Q4, the gate of the fourth NMOS transistor Q4 is connected to the protocol circuit 40, and the drain of the fourth NMOS transistor Q4 is connected to the through-NMOS transistor Q1. Figure 2As shown, the through driving module 50 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a second field effect transistor Q2 and a third field effect transistor Q3, the gate of the second field effect transistor Q2 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the drain of the second field effect transistor Q2 is connected to the second end of the second resistor R2, the first end of the first resistor R1, the drain of the fourth NMOS transistor Q4 and the drain of the through NMOS transistor Q1, and the source of the second field effect transistor Q2 is connected to the first end of the first resistor R1. The second end of the third resistor R3 is connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5 and the first end of the first capacitor C1. The source of the third field effect transistor Q3 is connected to the second end of the fourth resistor R4 and the gate of the fourth NMOS transistor Q4. The second end of the third resistor R3 is connected to the first end of the second capacitor C2. The second end of the second capacitor C2 is connected to the second end of the fifth resistor R5, the second end of the first capacitor C1 and the first end of the sixth resistor R6. The second end of the sixth resistor R6 is connected to the source of the fourth NMOS transistor Q4.
[0021] In the power supply drive pass-through device for a DC-DC conversion circuit provided by the present invention, an output NMOS transistor Q4 is driven by a charge pump integrated within a protocol circuit. A high level relative to the "output positive" is outputted by the protocol circuit's drive pin to drive the output NMOS transistor Q4 and power the pass-through drive module, but the power supply capacity is somewhat weak. When the pass-through drive module receives a low-level "pass-through enable signal," the third field-effect transistor Q3 is turned on via a first capacitor C1, a fourth resistor R4, and a fifth resistor R5. This conduction in turn turns on the pass-through NMOS transistor Q1. Because the power supply capacity of the protocol circuit's charge pump is somewhat weak, the fourth resistor R4 and the fifth resistor R5 are designed to be larger to ensure that the total load is within the charge pump's power supply capacity and does not affect the charge pump's operation. A signal with a level lower than the "pass-through enable signal" is quickly fed back to the third field-effect transistor Q3 via the first capacitor C1, enabling the third field-effect transistor Q3 to quickly turn on. When the pass-through drive module receives the "pass-through shutdown signal", the sixth resistor R6 will raise the voltage level and quickly turn off the third field-effect transistor Q3 through the first capacitor C1. Since the power supply capacity of the charge pump of the protocol circuit is a bit weak, the resistance of the first resistor R1 should be larger so that the total load is within the power supply capacity of the charge pump and does not affect the operation of the charge pump. Therefore, when quickly turning off the pass-through NMOS transistor Q1, it is necessary to quickly turn on the second field-effect transistor Q2. The signal is quickly fed back to the second field-effect transistor Q2 through the second capacitor C2, the third resistor R3, and the second resistor R2, so that the pass-through NMOS transistor Q1 is quickly turned off.
[0022] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.
[0023] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various invention aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, invention aspects lie in less than all of the features of the individual embodiments disclosed above. Accordingly, the claims that follow the detailed description are hereby expressly incorporated into this detailed description, with each claim itself serving as a separate embodiment of the present invention.
[0024] Furthermore, those skilled in the art will appreciate that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination.
[0025] It should be noted that the above embodiments illustrate rather than limit the present invention, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbols placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.
Claims
1. A power supply drive pass-through device for a DC-DC conversion circuit, characterized in that: The invention comprises a through-NMOS transistor Q1, a through-drive module (50) and an output switch module (60), wherein the input end of the through-NMOS transistor Q1 is connected to the output end of the input module (10), the output end of the through-NMOS transistor Q1 is connected to the input end of the output module (20), the first input end of the through-drive module (50) is connected to a through signal, the output end of the protocol circuit (40) is connected to the second input end of the through-drive module (50) and the control end of the output switch module (60), the output end of the through-drive module (50) is connected to the control end of the through-NMOS transistor Q1, the input end of the output switch module (60) is connected to the output end of the DC-DC conversion circuit (30), and the output end of the output switch module (60) is connected to the control end of the DC-DC conversion circuit (30). The input end of the output module (20) drives the signal of the output switch module (60) through the charge pump integrated in the protocol circuit (40); after the through-drive module (50) receives the through-on signal, the through-drive module (50) connects the power supply of the charge pump to the through-NMOS transistor Q1 through the signal of the output switch module (60) to turn on the through-NMOS transistor Q1; the through-NMOS transistor Q1 turns on the input module (10) and the output module (20) under the control of the through-on signal; after the through-drive module (50) receives the through-off signal, the through-NMOS transistor Q1 turns off the input module (10) and the output module (20) under the control of the through-off signal.
2. The power supply drive pass-through device for a DC-DC conversion circuit according to claim 1, characterized in that: The output switch module (60) is a fourth NMOS transistor Q4, the gate of the fourth NMOS transistor Q4 is connected to the protocol circuit (40), the drain of the fourth NMOS transistor Q4 is connected to the drain of the straight-through NMOS transistor Q1, and the source of the fourth NMOS transistor Q4 is connected to the output end of the DC-DC conversion circuit (30).
3. The power supply drive pass-through device for a DC-DC conversion circuit according to claim 2, wherein: The through driving module (50) comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a second field effect transistor Q2 and a third field effect transistor Q3, wherein the gate of the second field effect transistor Q2 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the drain of the second field effect transistor Q2 is connected to the second end of the second resistor R2, the first end of the first resistor R1, the drain of the fourth NMOS transistor Q4 and the drain of the through NMOS transistor Q1, and the source of the second field effect transistor Q2 is connected to the second end of the first resistor R1, the first end of the through The gate of the NMOS transistor Q1 and the drain of the third field-effect transistor Q3 are connected. The gate of the third field-effect transistor Q3 is connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5, and the first end of the first capacitor C1. The source of the third field-effect transistor Q3 is connected to the second end of the fourth resistor R4 and the gate of the fourth NMOS transistor Q4. The second end of the third resistor R3 is connected to the first end of the second capacitor C2. The second end of the second capacitor C2 is connected to the second end of the fifth resistor R5, the second end of the first capacitor C1, and the first end of the sixth resistor R6. The second end of the sixth resistor R6 is connected to the source of the fourth NMOS transistor Q4.
4. A PD power supply, characterized in that: The invention comprises a power supply drive pass-through device for a DC-DC conversion circuit according to any one of claims 1 to 3.