Constant-voltage direct-current power supply circuit with short-circuit protection and over-current protection
By designing a constant voltage DC power supply circuit including an input module, a sampling module and a pulse output module, the problem of high power supply cost in the serial port screen and no short circuit protection and overcurrent protection is solved, and a low-cost power protection effect is achieved.
Patent Information
- Application Number
- CN202422212010.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-08-08
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The serial port screen has high power supply costs and does not have short circuit protection and overcurrent protection.
A constant voltage DC power supply circuit including an input module, a first sampling module, a second sampling module, a first pulse output module, a second pulse output module, a locking module and an output module are designed to control the on-off of the pulse output module through current signal sampling to realize short circuit and overcurrent protection.
Low-cost short-circuit protection and overcurrent protection are achieved, avoiding the cost of using additional drivers while ensuring stable power supply operation.
Smart Images
Figure CN223206823U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of serial port screen power supply, in particular to a constant voltage DC power supply circuit with short circuit protection and overcurrent protection. Background Art
[0002] A serial port display is a human-computer interaction interface. Its primary purpose is to address the need for customers to use low-end MCUs to drive high-resolution LCD color screens. This addresses the issue of users unfamiliar with high-speed signal interfaces like RGB / MIPI / LVDS. With a serial port display, users don't need to worry about LCD color screen drivers, but only need to handle the business logic control design they are proficient in. Serial port displays are increasingly being used to upgrade traditional white goods black and white / disconnected screens to LCD color screens, charging stations, instrumentation equipment operation interfaces, and elevator multimedia systems.
[0003] Generally speaking, the serial port screen only requires a small amount of power to drive during use, but requires a large instantaneous power during the startup process. The general practice is to use an additional driver to cooperate with it, which is costly; and this driver does not have short-circuit protection and overcurrent protection. Summary of the Invention
[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a constant voltage DC power supply circuit with short-circuit protection and overcurrent protection, which solves the problem that the serial port screen power supply has high cost and lacks short-circuit protection and overcurrent protection.
[0005] The utility model is realized through the following technical solutions:
[0006] A constant voltage DC power supply circuit with short-circuit protection and overcurrent protection includes an input module, a first sampling module, a second sampling module, a first pulse output module, a second pulse output module, a locking module, and an output module. The first sampling module is used to sample the current signal of the input module and control the on and off of the first pulse output module according to the power to pulse-drive the on and off of the output module; the second sampling module is used to sample the current signal of the input module and control the on and off of the second pulse output module according to the current to drive the locking module to start; when the locking module is started, the locking module controls the output module to be disconnected, the first pulse output module is connected to the ground, and the second pulse output module controls the locking module to be continuously connected.
[0007] The constant voltage DC power supply circuit further includes a delay module, and the delay module is connected to the input end of the locking module and the second pulse output module.
[0008] Wherein, the delay module includes a capacitor C5.
[0009] Among them, the first sampling module includes a transistor Q1, and the second sampling module includes a transistor Q2. The E end of the transistor Q1 and the E pole of the transistor Q2 are electrically connected to the output end of the input module, the C end of the transistor Q1 is electrically connected to the input end of the first pulse output module, and the C pole of the transistor Q2 is electrically connected to the input end of the second pulse output module.
[0010] Among them, the first pulse output module includes a transistor Q4, and the second pulse output module includes a transistor Q5. The B pole of the transistor Q4 and the B pole of the transistor Q5 are respectively electrically connected to the output end of the locking module, the E pole of the transistor Q4 and the E pole of the transistor Q5 are respectively electrically connected to the input end of the input module, and the C pole of the transistor Q4 and the C pole of the transistor Q5 are respectively electrically connected to the output end of the input module.
[0011] Among them, the locking module includes a transistor Q3, a diode D2 and a diode D3. The E pole of the transistor Q3 is electrically connected to the output end of the input module, the B pole of the transistor Q3 is electrically connected to the C pole of the transistor Q5, the C pole of the transistor Q3 is electrically connected to the cathode of the diode D2 and the cathode of the diode D3 respectively, the anode of the diode D2 is electrically connected to the B pole of the transistor Q4, and the anode of the diode D3 is electrically connected to the B pole of the transistor Q5.
[0012] Beneficial effects of the utility model:
[0013] The utility model discloses a constant voltage DC power supply circuit with short circuit protection and overcurrent protection. The circuit is provided with an input module, a first sampling module, a second sampling module, a first pulse output module, a second pulse output module, a locking module and an output module. When the serial port screen needs to be started, the outside world inputs an instantaneous pulse large current signal to the input module, and the first sampling module outputs a signal to turn off the first pulse output module. When the serial port screen is started, the outside world inputs a small current to the input module to maintain the operation of the serial port screen. At this time, the first sampling module is disconnected, and the input module is directly connected to the output module to power the serial port screen.
[0014] When the power supply is short-circuited or overcurrent occurs, the second sampling module controls the second pulse output module to start, and the second pulse output module controls the locking module to disconnect the output module. At the same time, the first pulse output module is connected to the ground, and the second pulse output module controls the locking module to continue to be connected to complete the circuit cutting and locking, thereby achieving short-circuit and overcurrent protection.
[0015] Compared with the prior art, the present invention does not require a driver, has a lower cost, and can simultaneously provide the effects of short-circuit protection and overcurrent protection. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.
[0017] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION
[0018] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.
[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0021] A serial port display is a human-computer interaction interface. Its primary purpose is to address the need for customers to use low-end MCUs to drive high-resolution LCD color screens. This addresses the issue of users unfamiliar with high-speed signal interfaces like RGB / MIPI / LVDS. With a serial port display, users don't need to worry about LCD color screen drivers, but only need to handle the business logic control design they are proficient in. Serial port displays are increasingly being used to upgrade traditional white goods black and white / disconnected screens to LCD color screens, charging stations, instrumentation equipment operation interfaces, and elevator multimedia systems.
[0022] Generally speaking, the serial port screen only requires a small amount of power to drive during use, but requires a large instantaneous power during the startup process. The general practice is to use an additional driver to cooperate with it, which is costly; and this driver does not have short-circuit protection and overcurrent protection.
[0023] In order to solve the above problems, this embodiment discloses a constant voltage DC power supply circuit with short circuit protection and overcurrent protection, and its circuit schematic diagram is shown in FIG. Figure 1 As shown, the constant voltage DC power supply circuit includes an input module, a first sampling module, a second sampling module, a first pulse output module, a second pulse output module, a locking module and an output module. The first sampling module is used to sample the current signal of the input module and control the on and off of the first pulse output module according to the power to drive the on and off of the output module; the second sampling module is used to sample the current signal of the input module and control the on and off of the second pulse output module according to the current to drive the locking module to start; when the locking module is started, the locking module controls the first pulse output module, the second pulse output module and the output module to be disconnected at the same time.
[0024] In this embodiment, the input module includes a diode D1, a capacitor C1, a resistor R1 and a linear regulator U1, which can filter and stabilize the input current; the output module includes a power output interface JP1 and an output switch tube Q6, and the on / off of the power output interface JP1 can be controlled by controlling the on / off of the switch tube Q6.
[0025] Furthermore, the constant voltage DC power supply circuit also includes a delay module, which includes a capacitor C5. The delay module is connected to the input end of the locking module at the second pulse output module, and can play the role of delaying the protection of the second pulse output module.
[0026] Specifically, the first sampling module includes a transistor Q1, and the second sampling module includes a transistor Q2. The E end of the transistor Q1 and the E end of the transistor Q2 are electrically connected to the output end of the input module, the C end of the transistor Q1 is electrically connected to the input end of the first pulse output module, and the C end of the transistor Q2 is electrically connected to the input end of the second pulse output module.
[0027] Specifically, the first pulse output module includes a transistor Q4, and the second pulse output module includes a transistor Q5. The B pole of the transistor Q4 and the B pole of the transistor Q5 are respectively electrically connected to the output end of the locking module, the E pole of the transistor Q4 and the E pole of the transistor Q5 are respectively electrically connected to the input end of the input module, and the C pole of the transistor Q4 and the C pole of the transistor Q5 are respectively electrically connected to the output end of the input module.
[0028] Specifically, the locking module includes a transistor Q3, a diode D2 and a diode D3. The E pole of the transistor Q3 is electrically connected to the output end of the input module, the B pole of the transistor Q3 is electrically connected to the C pole of the transistor Q5, the C pole of the transistor Q3 is electrically connected to the cathode of the diode D2 and the cathode of the diode D3 respectively, the anode of the diode D2 is electrically connected to the B pole of the transistor Q4, and the anode of the diode D3 is electrically connected to the B pole of the transistor Q5.
[0029] In summary, the utility model is a constant voltage DC power supply circuit with short circuit protection and overcurrent protection, which is provided with an input module, a first sampling module, a second sampling module, a first pulse output module, a second pulse output module, a locking module and an output module. When the serial port screen needs to be started, the outside world inputs an instantaneous pulse large current signal to the input module, and the first sampling module outputs a signal to turn off the first pulse output module. When the serial port screen is started, the outside world inputs a small current to the input module to maintain the operation of the serial port screen. At this time, the first sampling module is disconnected, and the input module is directly connected to the output module to power the serial port screen.
[0030] When the power supply is short-circuited or overcurrent occurs, the second sampling module controls the second pulse output module to start, and the second pulse output module controls the locking module to disconnect the output module. At the same time, the first pulse output module is connected to the ground, and the second pulse output module controls the locking module to continue to be connected to complete the circuit cutting and locking, thereby achieving short-circuit and overcurrent protection.
[0031] Compared with the prior art, the present invention does not require a driver, has a lower cost, and can simultaneously provide the effects of short-circuit protection and overcurrent protection.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.
Claims
1. A constant voltage DC power supply circuit with short circuit protection and overcurrent protection, characterized in that: It includes an input module, a first sampling module, a second sampling module, a first pulse output module, a second pulse output module, a locking module and an output module. The first sampling module is used to sample the current signal of the input module and control the on and off of the first pulse output module according to the power to drive the output module to be on and off; The second sampling module is used to sample the current signal of the input module and control the on and off of the second pulse output module according to the magnitude of the current to drive the locking module to start; When the locking module is started, the locking module controls the output module to be disconnected, the first pulse output module is connected to the ground, and the second pulse output module controls the locking module to be continuously connected.
2. A constant voltage DC power supply circuit with short circuit protection and overcurrent protection according to claim 1, characterized in that: The constant voltage DC power supply circuit further includes a delay module, which is connected to the input end of the locking module and the second pulse output module.
3. A constant voltage DC power supply circuit with short circuit protection and overcurrent protection according to claim 2, characterized in that: The delay module includes a capacitor C5.
4. The constant voltage DC power supply circuit with short circuit protection and overcurrent protection according to claim 1, characterized in that: The first sampling module includes a transistor Q1, and the second sampling module includes a transistor Q2. The E end of the transistor Q1 and the E pole of the transistor Q2 are electrically connected to the output end of the input module, the C end of the transistor Q1 is electrically connected to the input end of the first pulse output module, and the C pole of the transistor Q2 is electrically connected to the input end of the second pulse output module.
5. The constant voltage DC power supply circuit with short circuit protection and overcurrent protection according to claim 1, characterized in that: The first pulse output module includes a transistor Q4, and the second pulse output module includes a transistor Q5. The B pole of the transistor Q4 and the B pole of the transistor Q5 are respectively electrically connected to the output end of the locking module, the E pole of the transistor Q4 and the E pole of the transistor Q5 are respectively electrically connected to the input end of the input module, and the C pole of the transistor Q4 and the C pole of the transistor Q5 are respectively electrically connected to the output end of the input module.
6. A constant voltage DC power supply circuit with short circuit protection and overcurrent protection according to claim 5, characterized in that: The locking module includes a transistor Q3, a diode D2 and a diode D3. The E pole of the transistor Q3 is electrically connected to the output end of the input module, the B pole of the transistor Q3 is electrically connected to the C pole of the transistor Q5, the C pole of the transistor Q3 is electrically connected to the cathode of the diode D2 and the cathode of the diode D3 respectively, the anode of the diode D2 is electrically connected to the B pole of the transistor Q4, and the anode of the diode D3 is electrically connected to the B pole of the transistor Q5.