An ultra-low power consumption ejection type fuse CT power supply device

Abstract

The present invention discloses an ultra-low power consumption jet-type fuse CT power supply device, comprising a jet-type fuse, a power supply mechanism and a single-chip computer system. The power supply mechanism comprises a power supply CT, a power supply circuit, a CT output protection circuit and a backup power supply circuit. Electric energy is obtained by connecting the power supply CT on the incoming line side of the jet-type fuse, and stored in the power supply circuit and the backup power supply circuit to provide electric energy for a detection device, thereby solving the problem that current power automation devices such as fault indicators rely on battery power due to the ampere-level starting current. Without changing the external dimensions and installation method of the jet-type fuse, low-cost transformation of the power distribution Internet of Things is achieved. Specifically, through the action of the CT output protection circuit, the output of the power supply CT is clamped, short-circuited and other protections are performed, ensuring that the power supply CT still outputs a stable working voltage under abnormal input current conditions, effectively ensuring the reliable and safe application of CT power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution Internet of Things, and in particular to an ultra-low power consumption jet-type fuse CT power supply device. Background Art

[0002] State Grid Corporation of China has proposed to “focus on world-class energy internet enterprises”, uphold the truth and innovate, take responsibility and act, build “hub-type, platform-type, and sharing-type” enterprises, and construct and operate a “strong smart grid and ubiquitous power Internet of Things”.

[0003] The Power Distribution Internet of Things (PDIIT) is a crucial component of the ubiquitous Power Internet of Things (PIoT). It is a cyber-physical system that deeply integrates traditional industrial technologies with IoT technologies. Through the comprehensive interconnection, interoperability, and interoperability of distribution network equipment, it enables comprehensive network awareness, data fusion, and intelligent applications. This meets the needs of lean distribution network management and supports the rapid development of the Energy Internet. It represents the distribution network within the next-generation power system. In terms of application, the PDIIT features plug-and-play terminals, extensive device connectivity, comprehensive state awareness, application model upgrades, rapid service iteration, and efficient resource utilization.

[0004] Currently, most user demarcation points are still protected by fuses, and the fuse status in large-scale applications cannot effectively monitor the operating conditions in real time online. Summary of the Invention

[0005] The present invention provides an ultra-low power consumption ejection type fuse CT power supply device with low starting current and capable of providing reliable power supply guarantee for monitoring, so as to solve the technical problems mentioned in the above background technology part.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an ultra-low power consumption jet-type fuse CT power supply device, comprising a jet-type fuse, a power supply mechanism, and a single-chip computer system, wherein the power supply mechanism comprises a power supply CT connected to the incoming line side of the jet-type fuse, and;

[0007] A power supply circuit is connected to the output terminal of the power taking CT, receives the AC voltage output by the power taking CT, and outputs a working DC voltage to the single chip computer system;

[0008] A CT output protection circuit is connected to the output terminal of the power CT and clamps the output of the power CT when the output voltage of the power CT is greater than a preset hysteresis threshold;

[0009] The backup power supply circuit is connected to the output end of the power supply circuit and is used for power storage and outputting a working DC voltage to the single chip computer system after a power outage.

[0010] Preferably, the starting current of the power CT is 0.5A, and the power CT enters a saturation state after the current reaches 2A. The current output power of the power CT after startup is greater than 100mW.

[0011] Preferably, the power supply circuit includes: a rectifier bridge composed of a diode D1, a diode D2, a diode D3 and a diode D4, as well as a thermistor RT1, a power resistor DR2, a power resistor DR3, a bidirectional TVS tube Z7, a capacitor E3, a voltage-regulating diode Z1, a voltage-regulating diode Z8, a diode D18, a capacitor E1 and a power chip U7. The power taken from both ends of the CT is converted into direct current through the rectifier bridge, wherein the positive and negative poles of the direct current are connected to the bidirectional TVS tube Z7 to complete voltage clamping, and the positive pole of the direct current is simultaneously connected to the thermistor RT1 for protection and then enters the capacitor E3 to complete voltage smoothing and energy storage VDD0. The positive pole of the capacitor E3 is connected to the voltage-regulating and current-limiting circuit composed of the power resistor DR2 and the voltage-regulating diode Z8 to complete 10V voltage clamping, and then passes through the voltage-regulating and current-limiting circuit composed of the power resistor DR3 and the voltage-regulating diode Z1 to complete 5V voltage clamping. The 5V voltage passes through the diode D18 and enters the capacitor E1 for energy storage. The positive pole of the capacitor E1 is connected to the power management chip U7, and the power management chip U7 outputs a DC3.3V working DC voltage.

[0012] Preferably, the CT output protection circuit includes:

[0013] A voltage comparator is composed of resistors R41, R78, R77, and comparator U19. The positive electrode VDD0 of the positive electrode of the capacitor E3 is connected to the positive terminal of the comparator U19 after being divided by resistors R41 and R68. The negative terminal of the comparator U19 is connected to the stable voltage V1P2. The resistor R77 is connected between the positive terminal and the output of the comparator U19 to form a Schmitt circuit.

[0014] A hysteresis comparator is composed of a diode D14, a diode D15, a resistor R11, a MOS transistor V4, a MOS transistor V5, and a bidirectional TVS transistor Z6, wherein the two ends of the bidirectional TVS transistor Z6 are respectively adjacent to the two ends of the power supply CT. The output BH_GB end of the comparator U19 is connected to the positive end of the diode D15. When the positive end voltage of the diode D15 is greater than the upper limit of the hysteresis threshold, the hysteresis comparator outputs a high level, and the MOS transistors V4 and V5 are turned on, short-circuiting the two ends of the power supply CT. When the positive end voltage of the diode D15 is less than the lower limit of the hysteresis threshold, the hysteresis comparator outputs a low level, and the MOS transistors V4 and V5 are turned off.

[0015] Preferably, the backup power supply circuit includes a DC / DC chip U16, a diode D5, a supercapacitor SCF1 and a chip U8, the input end of the DC / DC chip U16 is connected to the output end of the power supply circuit, the DC / DC chip U16 is used to convert the 3.3V working DC voltage into a 2.7V voltage, the output end of the DC / DC chip U16 is connected to the positive electrode of the diode D5, the negative electrode of the diode D5 is connected to the supercapacitor SCF1, the supercapacitor SCF1 is used for energy storage, and the chip U8 is connected to the output end of the supercapacitor SCF1, and is used to boost the voltage in the supercapacitor SCF1 to a working DC voltage of 3.3V.

[0016] Preferably, the power CT and the injection-type fuse are integrally cast.

[0017] Preferably, the single-chip microcomputer system includes a single-chip microcomputer, an infrared transmitting circuit, an infrared receiving circuit and a communication module, wherein the single-chip microcomputer port DLKZ is connected to the positive electrode of the diode D14. When the single-chip microcomputer detects that the supercapacitor SCF1 is fully charged, the single-chip microcomputer port DLKZ outputs a high level, the MOS tube V4 and the MOS tube V5 are turned on, and the two ends of the power supply CT are short-circuited. The single-chip microcomputer is used to control the power supply of the infrared transmitting circuit and the infrared receiving circuit. The single-chip microcomputer is connected to the communication module and is connected to the Internet of Things through the communication module. The infrared transmitting circuit and the infrared receiving circuit are respectively equipped with an infrared transmitting tube and an infrared receiving tube for detecting the position of the fuse component of the ejection type fuse.

[0018] Compared with the prior art, the present invention has the following beneficial effects: in the present invention, electric energy is obtained by connecting the power-taking CT on the incoming line side of the ejection-type fuse, and stored in the power circuit and the backup power circuit to provide electric energy for the detection device, thereby solving the problem that the current power automation devices such as fault indicators have an ampere-level starting current and thus rely on batteries for power supply, and does not change the external dimensions and installation method of the ejection-type fuse, thereby realizing low-cost transformation of the power distribution Internet of Things. Among them, through the action of the CT output protection circuit, the output of the power-taking CT is clamped, short-circuited, and protected, ensuring that the power-taking CT still outputs a stable working voltage under abnormal input current conditions, effectively ensuring the reliable and safe application of CT power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0020] In the attached figure:

[0021] Figure 1 It is a structural schematic diagram of the ejection type fuse of the present invention;

[0022] Figure 2 This is a functional block diagram of the CT power supply system of the present invention;

[0023] Figure 3 It is a power supply circuit diagram of the present invention;

[0024] Figure 4 This is a CT output protection circuit diagram of the present invention;

[0025] Figure 5 It is a backup power supply circuit diagram of the present invention;

[0026] Numbers in the figure: 1. Ejection type fuse; 2. Power supply mechanism. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] Example: Figure 1-5 As shown, an ultra-low power consumption jet-type fuse CT power supply device includes a jet-type fuse 1, a power supply mechanism 2 and a single-chip computer system. The power supply mechanism 2 includes a power supply CT connected to the incoming line side of the jet-type fuse, and;

[0029] The power supply circuit is connected to the output terminal of the power CT, receives the AC voltage output by the power CT, and outputs a working DC voltage to the single-chip computer system;

[0030] The CT output protection circuit is connected to the output terminal of the power CT and clamps the output of the power CT when the output voltage of the power CT is greater than a preset hysteresis threshold;

[0031] The backup power supply circuit is connected to the output end of the power supply circuit and is used for power storage and outputting working DC voltage to the microcontroller system after a power outage.

[0032] Among them, the starting current of the power CT is 0.5A, and the power CT enters the saturation state after the current reaches 2A. The current output power after the power CT is started is greater than 100mW, and the power CT and the jet-type fuse are integrally cast. The power circuit, CT output protection circuit and backup power circuit are all installed at the bottom of the jet-type intelligent fuse.

[0033] like Figure 3As shown, the power supply circuit includes: a rectifier bridge composed of diodes D1, D2, D3 and D4, as well as a thermistor RT1, a power resistor DR2, a power resistor DR3, a bidirectional TVS tube Z7, a capacitor E3, a voltage-stabilizing diode Z1, a voltage-stabilizing diode Z8, a diode D18, a capacitor E1 and a power chip U7. The power taken from both ends of CT is converted into direct current through the rectifier bridge. Among them, the positive and negative poles of the direct current are connected to the bidirectional TVS tube Z7 to complete voltage clamping. The positive pole of the direct current is also connected to the thermistor RT1 for protection and then enters the capacitor E3 to complete voltage smoothing and energy storage VDD. 0, the positive electrode of capacitor E3 is connected to the voltage-stabilizing and current-limiting circuit composed of power resistor DR2 and voltage-stabilizing diode Z8 to complete 10V voltage clamping, and then passes through the voltage-stabilizing and current-limiting circuit composed of power resistor DR3 and voltage-stabilizing diode Z1 to complete 5V voltage clamping. The 5V voltage enters capacitor E1 for energy storage through diode D18. The positive electrode of capacitor E1 is connected to the power management chip U7. The power management chip U7 outputs a DC3.3V working DC voltage. In order to ensure the uniqueness of the current direction, the output end of the power management chip U7 is connected to the diode D6. The output current enters the subsequent circuit after being processed by diode D6.

[0034] like Figure 4 As shown, the CT output protection circuit includes:

[0035] like Figure 4 On the right side of the circuit, resistors R41, R78, R77, and comparator U19 form a voltage comparator. The positive electrode VDD0 of the capacitor positive electrode E3 is connected to the positive terminal of the comparator U19 after being divided by resistors R41 and R68. The negative terminal of the comparator U19 is connected to the stable voltage V1P2. Resistor R77 is connected between the positive terminal and the output of the comparator U19 to form a Schmitt circuit.

[0036] like Figure 4 The left circuit consists of a hysteresis comparator consisting of diode D14, diode D15, resistor R11, MOS transistors V4 and V5, and a bidirectional TVS transistor Z6. The two ends of the bidirectional TVS transistor Z6 are adjacent to the two ends of the power supply CT. The output BH_GB of the comparator U19 is connected to the positive end of the diode D15, and a hysteresis threshold is preset. When the voltage at the positive end of the diode D15 is greater than the upper limit of the hysteresis threshold, the hysteresis comparator outputs a high level, MOS transistors V4 and V5 are turned on, and the power supply CT output is short-circuited, protecting the controller microcontroller circuit. When the voltage at the positive end of the diode D15 is less than the lower limit of the hysteresis threshold, the hysteresis comparator outputs a low level, and the MOS transistors V4 and V5 are turned off.

[0037] like Figure 5As shown, the backup power supply circuit includes a DC / DC chip U16, a diode D5, a supercapacitor SCF1 and a chip U8. The input end of the DC / DC chip U16 is connected to the output end of the power supply circuit. The DC / DC chip U16 is used to convert the 3.3V working DC voltage into a 2.7V voltage. The output end of the DC / DC chip U16 is connected to the positive electrode of the diode D5, and the negative electrode of the diode D5 is connected to the supercapacitor SCF1. The supercapacitor SCF1 is used for energy storage. The chip U8 is connected to the output end of the supercapacitor SCF1 and is used to boost the voltage in the supercapacitor SCF1 to a working DC voltage of 3.3V.

[0038] In the present invention, the single-chip microcomputer system includes a single-chip microcomputer, an infrared transmitting circuit, an infrared receiving circuit, and a communication module. In this embodiment, a single-chip microcomputer of model STM32L433VC is used, wherein the single-chip microcomputer port DLKZ is connected to the positive electrode of the diode D14. When the single-chip microcomputer detects that the supercapacitor SCF1 is fully charged, the single-chip microcomputer port DLKZ outputs a high level, the MOS tube V4 and the MOS tube V5 are turned on, the power CT output is short-circuited, and the controller single-chip microcomputer circuit is protected. The single-chip microcomputer is used to fully control the power supply of the infrared transmitting circuit and the infrared receiving circuit. The single-chip microcomputer and the communication module The blocks are connected and connected to the Internet of Things through a communication module. The power supply can be replaced online to achieve remote control, fully reduce working power consumption, effectively increase service life and reduce maintenance costs. Infrared transmitting circuit and infrared receiving circuit are respectively equipped with infrared transmitting tube and infrared receiving tube, which are used to detect the position of the fuse component of the jet type fuse. The power taking device is used to provide power, which solves the problem that the current power automation devices such as fault indicators have an ampere-level starting current and rely on batteries for power supply, and does not change the external dimensions and installation method of the jet type fuse, thereby realizing low-cost transformation of the power distribution Internet of Things.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An ultra-low power consumption ejector type fuse CT power supply device, characterized by: It includes an ejection type fuse, a power taking mechanism and a single chip computer system, wherein the power taking mechanism includes a power taking CT connected to the incoming line side of the ejection type fuse, and; A power supply circuit is connected to the output terminal of the power taking CT, receives the AC voltage output by the power taking CT, and outputs a working DC voltage to the single chip computer system; A CT output protection circuit is connected to the output terminal of the power CT and clamps the output of the power CT when the output voltage of the power CT is greater than a preset hysteresis threshold; The CT output protection circuit includes: Resistors R41, R78, R77, and comparator U19 form a voltage comparator. The positive electrode VDD0 of the capacitor positive electrode E3 is connected to the positive terminal of the comparator U19 after being divided by resistors R41 and R68. The negative terminal of the comparator U19 is connected to the stable voltage V1P2. Resistor R77 is connected between the positive terminal and the output of the comparator U19 to form a Schmitt circuit. A hysteresis comparator is composed of a diode D14, a diode D15, a resistor R11, MOS transistors V4 and V5, and a bidirectional TVS transistor Z6, wherein the two ends of the bidirectional TVS transistor Z6 are respectively adjacent to the two ends of the power supply CT. The output BH_GB end of the comparator U19 is connected to the positive end of the diode D15, and a hysteresis threshold is preset. When the voltage at the positive end of the diode D15 is greater than the upper limit of the hysteresis threshold, the hysteresis comparator outputs a high level, and the MOS transistors V4 and V5 are turned on, short-circuiting the two ends of the power supply CT. When the voltage at the positive end of the diode D15 is less than the lower limit of the hysteresis threshold, the hysteresis comparator outputs a low level, and the MOS transistors V4 and V5 are turned off. The backup power supply circuit is connected to the output end of the power supply circuit and is used for power storage and outputting a working DC voltage to the single chip computer system after a power outage.

2. The ultra-low power consumption ejector type fuse CT power supply device according to claim 1, characterized in that: The starting current of the power CT is 0.5A, and the power CT enters a saturation state after the current reaches 2A. The current output power of the power CT after startup is greater than 100mW.

3. The ultra-low power consumption ejection type fuse CT power supply device according to claim 1, characterized in that: The power supply circuit includes: a rectifier bridge composed of a diode D1, a diode D2, a diode D3 and a diode D4, as well as a thermistor RT1, a power resistor DR2, a power resistor DR3, a bidirectional TVS tube Z7, a capacitor E3, a voltage-regulating diode Z1, a voltage-regulating diode Z8, a diode D18, a capacitor E1 and a power chip U7. The power CT is converted into direct current through the rectifier bridge at both ends, wherein the positive and negative poles of the direct current are connected to the bidirectional TVS tube Z7 to complete voltage clamping. The positive pole of the direct current is also connected to the thermistor RT1 for protection and then enters the capacitor E3 to complete voltage smoothing and energy storage VDD0. The positive pole of the capacitor E3 is connected to the voltage-regulating and current-limiting circuit composed of the power resistor DR2 and the voltage-regulating diode Z8 to complete 10V voltage clamping, and then passes through the voltage-regulating and current-limiting circuit composed of the power resistor DR3 and the voltage-regulating diode Z1 to complete 5V voltage clamping. The 5V voltage passes through the diode D18 and enters the capacitor E1 for energy storage. The positive pole of the capacitor E1 is connected to the power management chip U7, and the power management chip U7 outputs a DC3.3V working DC voltage.

4. The ultra-low power consumption ejector fuse CT power supply device according to claim 3, characterized in that: The backup power supply circuit includes a DC / DC chip U16, a diode D5, a supercapacitor SCF1 and a chip U8. The input end of the DC / DC chip U16 is connected to the output end of the power supply circuit. The DC / DC chip U16 is used to convert the 3.3V working DC voltage into a 2.7V voltage. The output end of the DC / DC chip U16 is connected to the positive electrode of the diode D5, and the negative electrode of the diode D5 is connected to the supercapacitor SCF1. The supercapacitor SCF1 is used for energy storage. The chip U8 is connected to the output end of the supercapacitor SCF1 and is used to boost the voltage in the supercapacitor SCF1 to a working DC voltage of 3.3V.

5. The ultra-low power consumption ejection type fuse CT power supply device according to claim 1, characterized in that: The power CT and the jet-type fuse are integrally cast.

6. The ultra-low power consumption ejection type fuse CT power supply device according to claim 4, characterized in that: The single-chip microcomputer system includes a single-chip microcomputer, an infrared transmitting circuit, an infrared receiving circuit, and a communication module, wherein the single-chip microcomputer port DLKZ is connected to the positive electrode of the diode D14. When the single-chip microcomputer detects that the supercapacitor SCF1 is fully charged, the single-chip microcomputer port DLKZ outputs a high level, the MOS tube V4 and the MOS tube V5 are turned on, and the two ends of the power supply CT are short-circuited. The single-chip microcomputer is used to control the power supply of the infrared transmitting circuit and the infrared receiving circuit. The single-chip microcomputer is connected to the communication module and is connected to the Internet of Things through the communication module. The infrared transmitting circuit and the infrared receiving circuit are respectively installed with an infrared transmitting tube and an infrared receiving tube for detecting the position of the fuse component of the ejection type fuse.

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