A load-adjustable dc single-wire power supply protection device

Abstract

The application relates to a load-adjustable direct-current single-wire power taking protection device, which comprises a main circuit module, a driving module and a protection module connected electrically, the main circuit module comprises a transformer T1 and a transformer T2, is used for generating a direct-current auxiliary power supply to supply power for the driving module, further comprises a field effect tube V1, a field effect tube V2, a gate-source resistor R1, a gate-source resistor R2, a sampling resistor R0 and a load resistor RL, the driving module adopts an integrated circuit D1, the integrated circuit D1 is provided with multiple non-gates to constitute an oscillator, outputs driving signals with different waveforms, drives the field effect tube V1 and the field effect tube V2 to be turned on or turned off, and the capacitor C7 in the protection module is charged by a voltage reference source N2. The single-wire works, outputs two-way driving signals with high level short-time overlapping complements through the oscillator, controls the on-off of the two field effect tubes, implements the "belch type" protection when a fault occurs, and restores the power supply after the fault is eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current power supply and new energy, and particularly relates to a load-adjustable direct current single-wire power taking protection device. BACKGROUND

[0002] Relay and fuse are classic products with simple structure and reliable performance, and are widely used in power supply equipment in various industries. With the rapid development of photovoltaic industry, wind power industry, charging pile and energy storage and other new energy industries, the number of direct current power supply systems is increasing, and intelligent management and automatic control technology are widely used. The traditional relay and fuse can only provide basic control and protection performance, and cannot meet the intelligent control requirements of the new generation of direct current power supply system. Therefore, manufacturers need to design specific specifications and specific functions of power supply equipment based on product demand. Such power supply equipment has the problem of insufficient universality, and the production design cost is too high. SUMMARY

[0003] The present application provides a load-adjustable direct current single-wire power taking protection device, which can directly replace the traditional fuse, is compatible with the original system, and does not need to be rewired. The single-wire works, outputs two complementary driving signals with high level short-time overlap through the oscillator, controls the on-off of two field effect tubes, and implements "belch type" protection when a fault occurs. After the fault is eliminated, the power is restored.

[0004] The first aspect of the present application discloses a load-adjustable direct current single-wire power taking protection device, characterized in that it comprises:

[0005] The main circuit module, the driving module and the protection module are electrically connected.

[0006] The main circuit module comprises a transformer T1 and a transformer T2, the transformer T1 has a primary coil L1-1, a primary coil L1-2 and a secondary coil L1-3, the transformer T2 has a primary coil L2-1, a primary coil L2-2 and a secondary coil L2-3, the positive pole A+ of the input power supply is connected to the primary coil L2-1 and the primary coil L2-2, and the primary coil L1-1 is connected to the primary coil L2-1, and the primary coil L1-2 is connected to the primary coil L2-2.

[0007] The transformer T1 is used to generate a direct current auxiliary power supply to supply power to the driving module. The positive pole of the direct current auxiliary power supply is B+, and the negative pole is B-, and B- is grounded.

[0008] The main circuit module further comprises a field effect transistor V1, a field effect transistor V2, a gate-source resistor R1, a gate-source resistor R2, a sampling resistor R0 and a load resistor RL, the source of the field effect transistor V1 is connected to one end of the sampling resistor R0, and the other end of the sampling resistor R0 is connected to one end of the load resistor RL;

[0009] The driving module adopts an integrated circuit D1, the integrated circuit D1 is provided with a NOT gate D1.1, a NOT gate D1.2, a NOT gate D1.3, a NOT gate D1.4, a NOT gate D1.5 and a NOT gate D1.6, and an oscillator is formed by the NOT gate D1.1, the NOT gate D1.2, the NOT gate D1.3, the NOT gate D1.4 and the NOT gate D1.5, the oscillator is used to output driving signals of different waveforms to drive the field effect transistor V1 and the field effect transistor V2 to be turned on or turned off;

[0010] The NOT gate 1.3 is connected to the gate of the field effect transistor V1 through the parallel connection of the capacitor C3 and the resistor R4, and outputs a driving signal S(d) to the field effect transistor V1, and the NOT gate 1.4 is connected to the gate of the field effect transistor V2 through the parallel connection of the capacitor C2 and the resistor R3, and outputs a driving signal S(g) to the field effect transistor V2;

[0011] In addition, the transformer T2 is used to measure the current value of the load resistor RL;

[0012] The protection module comprises a voltage reference source N1, a voltage reference source N2 and a capacitor C7, the voltage reference source N2 outputs a high level through the NOT gate D1.6, charges the capacitor C7 through the diode VD5 and the resistor R12, the voltage reference source N1 is connected to the positive pole B+ of the DC auxiliary power supply through the resistor R15, and the voltage reference source N2 is connected to the positive pole B+ of the DC auxiliary power supply through the resistor R16.

[0013] Preferably, the number of turns of the primary coil L1-1 is the same as that of the primary coil L1-2, and the number of turns of the primary coil L2-1 is the same as that of the primary coil L2-2.

[0014] The two terminals of the primary coil L1-1, the primary coil L1-2, the primary coil L2-1 and the primary coil L2-2 are marked as * terminal and + terminal respectively.

[0015] The positive pole A+ of the input power supply is connected to the different name terminals of the primary coil L1-1 and the primary coil L1-2 respectively.

[0016] Preferably, the sampling resistor R0 and the load resistor RL are combined to form a zero potential reference point, and provide a potential reference for the driving module and the protection module.

[0017] Preferably, one end of the resistor R19 is connected with one end of the capacitor C11, the input end h of the NOT gate D1.1, the other end of the resistor R19 is connected with the output end a of the NOT gate D1.1, the other end of the capacitor C11 is connected with the ground, and the combination constitutes a square wave oscillator, and the output duty cycle is 0.5 and the frequency is 100KHz.

[0018] Preferably, the input end of the NOT gate D1.2 is connected with the output end a of the NOT gate D1.1, the output end b of the NOT gate D1.2 is connected with the input end of the NOT gate D1.5, the capacitor C10 and the input end of the NOT gate D1.3, the output end e of the NOT gate D1.5 is connected with one end of the resistor R17 and the cathode of the diode VD1, the other end of the resistor R17 is connected with the anode of the diode VD1 and the input end f of the NOT gate D1.4.

[0019] Preferably, the waveform of the output end a is opposite to the waveform of the output end b;

[0020] The rising edge of the waveform of the input end c is delayed relative to the rising edge of the waveform of the output end b due to the integral delay of the resistor R18 and the capacitor C10;

[0021] The waveform of the output end d is the driving signal S(d), which is opposite to the waveform of the output end c;

[0022] The waveform of the output end e is the same as the waveform of the output end a;

[0023] The rising edge of the waveform of the input end f is delayed relative to the rising edge of the waveform of the output end e due to the integral delay of the resistor R17 and the capacitor C9;

[0024] The waveform of the output end g is the driving signal S(g), which is opposite to the waveform of the input end f.

[0025] Preferably, the waveforms of the driving signal S(d) and the driving signal S(g) are complementary;

[0026] The falling edge of the driving signal S(d) is delayed relative to the rising edge of the driving signal S(g), that is, the driving signal S(d) and the driving signal S(g) exist an overlapping interval in the high level half cycle;

[0027] When the driving signal S(d) is in the high level half cycle, the driving signal S(g) is in the low level half cycle, the field effect transistor V2 is cut off, the field effect transistor V1 is turned on, and the secondary side coil L1-3 or the secondary side coil L2-3 generates induced voltage;

[0028] When the driving signal S(g) is in the high level half cycle, the driving signal S(d) is in the low level half cycle, the field effect transistor V1 is cut off, the field effect transistor V2 is turned on, and the secondary side coil L1-3 or the secondary side coil L2-3 generates square wave voltage;

[0029] When the driving signal S(d) and the driving signal S(d) are in the overlapping interval of the high level half cycle, the field effect tube V1 and the field effect tube V2 are both turned on, and the alternating square wave voltage is output at the two ends of the secondary coil L1-3 or the secondary coil L2-3.

[0030] Preferably, the rectifier bridge VC1 or the rectifier bridge VC2 rectifies the alternating square wave voltage and outputs a direct current auxiliary current, which is used for powering the driving module, or as a detection current flowing through the load resistor RL, or as a small power supply.

[0031] Preferably, the capacitor C1, the resistor R5, the capacitor C4, the resistor R7 and the voltage stabilizing tube VD0 are used for cooperating to generate a starting voltage, and the driving module is used for generating a driving signal after the starting voltage is obtained.

[0032] Wherein, the capacitor C1 and the resistor R4 are connected in parallel, one end of which is connected to the positive pole A+ of the input power supply, and the other end is connected to one end of the capacitor C4, one end of the resistor R7, one end of the resistor R8 and the emitter of the transistor V4.

[0033] The resistor R5 is used for discharging the charge accumulated in the capacitor C1.

[0034] Preferably, the infrared light emitting diode U1.1, the infrared light sensitive triode U1.2 and the plug X2 are arranged.

[0035] The collector of the infrared light sensitive triode U1.2 is connected to the base of the transistor V5, and the emitter of the infrared light sensitive triode U1.2 is grounded.

[0036] The infrared light emitting diode U1.1 is connected to the plug X2, is current-limited by the resistor R20 and emits infrared light.

[0037] When the infrared light sensitive triode U1.2 is irradiated by infrared light, it is in a conductive state, the base current of the transistor V5 is short-circuited, the transistor V5 is cut off, and then the transistor V4 is cut off, and the direct current auxiliary power supply is cut off.

[0038] It can be seen that the traditional fuse can be directly replaced, the original system is compatible, and re-wiring is not required. The single-wire works, outputs two complementary driving signals with high level short-time overlap through an oscillator, controls the on-off of two field effect tubes, implements "belch type" protection when a fault occurs, and restores power supply after the fault is eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a circuit principle schematic diagram of a load-adjustable direct current single-wire power taking protection device of the present application;

[0040] Figure 2 is a waveform schematic diagram of each point of the driving module in the load-adjustable direct current single-wire power taking protection device of the present application;

[0041] Figure 3 is a waveform comparison diagram of the drive signal S(d) and the drive signal S(g) in a load-adjustable DC single-wire power supply protection device of the present application;

[0042] Figure 4 is a waveform diagram of the voltage generated by the secondary coil L1-3 or the secondary coil L2-3 in a load-adjustable DC single-wire power supply protection device of the present application. DETAILED DESCRIPTION

[0043] To deepen the understanding of the present application, the present application will be further described in detail below in combination with embodiments and drawings. The present application can be implemented in the following ways:

[0044] Please refer to Figures 1-4 A load-adjustable DC single-wire power supply protection device can include the following contents.

[0045] The main circuit module, the drive module and the protection module are electrically connected;

[0046] The main circuit module includes transformers T1 and T2, the transformer T1 has a primary coil L1-1, a primary coil L1-2 and a secondary coil L1-3, the transformer T2 has a primary coil L2-1, a primary coil L2-2 and a secondary coil L2-3, the positive pole A+ of the input power supply is connected to the primary coil L2-1 and the primary coil L2-2, and the primary coil L1-1 is connected to the primary coil L2-1, and the primary coil L1-2 is connected to the primary coil L2-2;

[0047] The transformer T1 is used to generate a DC auxiliary power supply to supply power to the drive module, the positive pole of the DC auxiliary power supply is B+, the negative pole is B-, and B- is grounded;

[0048] The main circuit module further includes field effect tubes V1 and V2, gate-source resistors R1 and R2, a sampling resistor R0 and a load resistor RL, the source of the field effect tube V1 is connected to one end of the sampling resistor R0, and the other end of the sampling resistor R0 is connected to one end of the load resistor RL;

[0049] The drive module uses an integrated circuit D1, the integrated circuit D1 has non-gates D1.1, D1.2, D1.3, D1.4, D1.5 and D1.6, and is composed of non-gates D1.1, D1.2, D1.3, D1.4 and D1.5 to form an oscillator, the oscillator is used to output drive signals of different waveforms to drive the field effect tubes V1 and V2 to conduct or cut off;

[0050] The non-gate 1.3 is connected with the capacitor C3 and the resistor R4 in parallel to the gate of the field effect transistor V1, and outputs the driving signal S(d) to the field effect transistor V1, and the non-gate 1.4 is connected with the capacitor C2 and the resistor R3 in parallel to the gate of the field effect transistor V2, and outputs the driving signal S(g) to the field effect transistor V2.

[0051] The transformer T2 is used to measure the current value of the load resistor RL.

[0052] The protection module comprises the voltage reference source N1, the voltage reference source N2 and the capacitor C7, the voltage reference source N2 outputs high level through the non-gate D1.6, charges the capacitor C7 through the diode VD5 and the resistor R12, the voltage reference source N1 is connected to the positive pole B+ of the DC auxiliary power supply through the resistor R15, and the voltage reference source N2 is connected to the positive pole B+ of the DC auxiliary power supply through the resistor R16.

[0053] In the embodiment, the number of turns of the primary coil L1-1 is the same as that of the primary coil L1-2, and the number of turns of the primary coil L2-1 is the same as that of the primary coil L2-2.

[0054] The two terminals of the primary coil L1-1, the primary coil L1-2, the primary coil L2-1 and the primary coil L2-2 are marked as * terminal and + terminal respectively.

[0055] The positive pole A+ of the input power supply is connected to the different name terminals of the primary coil L1-1 and the primary coil L1-2 respectively.

[0056] In the embodiment, the sampling resistor R0 and the load resistor RL are combined to form a zero potential reference point, which provides a potential reference for the driving module and the protection module.

[0057] Here, the zero potential reference point is the grounding point, and the gate resistor R1 is also connected between the gate of the field effect transistor V1 and the sampling resistor R0, and the gate resistor R2 is also connected between the gate of the field effect transistor V2 and the sampling resistor R0. The gate of the field effect transistor V2 is also connected to one end of the resistor R3 and one end of the capacitor C2, the resistor R4 and the capacitor C3 are connected to the driving signal S(d), and the resistor R3 and the capacitor C2 are connected to the driving signal S(g).

[0058] In the embodiment, one end of the resistor R19 and one end of the capacitor C11 are connected to the input end h of the non-gate D1.1, the other end of the resistor R19 is connected to the output end a of the non-gate D1.1, and the other end of the capacitor C11 is connected to the ground, which are combined to form a square wave oscillator, and output a square wave with a duty ratio of 0.5 and a frequency of 100KHz.

[0059] Here, the model of the field effect transistor integrated circuit D1 is CD40106, and the square wave oscillator is used to generate a basic square wave, which is then converted by a plurality of subsequent NAND gates to output two complementary driving signals with high level short-time overlap, which are used to drive the field effect transistor V1 and the field effect transistor V2.

[0060] In this embodiment, the input end of the NAND gate D1.2 is connected to the output end a of the NAND gate D1.1, the output end b of the NAND gate D1.2 is connected to the input end of the NAND gate D1.5, the capacitor C10 and the input end of the NAND gate D1.3, the output end e of the NAND gate D1.5 is connected to one end of the resistor R17 and the cathode of the diode VD1, and the other end of the resistor R17 is connected to the input end f of the NAND gate D1.4 and the anode of the diode VD1.

[0061] As an optional implementation, the waveform of the output end a is opposite to the waveform of the output end b;

[0062] Due to the integral delay of the resistor R18 and the capacitor C10, the rising edge of the waveform of the input end c is delayed relative to the rising edge of the waveform of the output end b;

[0063] The waveform of the output end d is the driving signal S(d), which is opposite to the waveform of the output end c;

[0064] The waveform of the output end e is the same as the waveform of the output end a;

[0065] Due to the integral delay of the resistor R17 and the capacitor C9, the rising edge of the waveform of the input end f is delayed relative to the rising edge of the waveform of the output end e;

[0066] The waveform of the output end g is the driving signal S(g), which is opposite to the waveform of the input end f.

[0067] As an optional implementation, the waveform of the driving signal S(d) is complementary to the waveform of the driving signal S(g);

[0068] The falling edge of the driving signal S(d) is delayed relative to the rising edge of the driving signal S(g), that is, the driving signal S(d) and the driving signal S(g) exist an overlapping interval in the high level half cycle;

[0069] When the driving signal S(d) is in the high level half cycle, the driving signal S(g) is in the low level half cycle, the field effect transistor V2 is cut off, the field effect transistor V1 is turned on, and the secondary side coil L1-3 or the secondary side coil L2-3 generates an induced voltage;

[0070] When the driving signal S(g) is in the high level half cycle, the driving signal S(d) is in the low level half cycle, the field effect transistor V1 is cut off, the field effect transistor V2 is turned on, and the secondary side coil L1-3 or the secondary side coil L2-3 generates a square wave voltage;

[0071] When the driving signal S(d) and the driving signal S(d) are in the overlapping interval of the high level half cycle, the field effect tube V1 and the field effect tube V2 are both turned on, and the alternating square wave voltage is output at both ends of the secondary coil L1-3 or the secondary coil L2-3.

[0072] As shown in the figure, the driving signal S(d) and the driving signal S(d) have a small overlap in the high level half cycle, so as to drive the field effect tube, and then make the secondary coil generate induced voltage, square wave voltage, or simultaneously act, output alternating square wave voltage, realize output DC auxiliary power supply, and can be used as a small power supply. Figures 2-4

[0073] In this embodiment, the rectifier bridge VC1 or the rectifier bridge VC2 rectifies the alternating square wave voltage and outputs the DC auxiliary current, which is used to power the driving module, or as a detection current flowing through the load resistor RL, or as a small power supply.

[0074] Therefore, in addition to the basic relay function, the scheme can also realize AC / DC output, current detection and other functions, and does not need to be modified for specific purposes, and can be adapted to various types of automation intelligent control systems, and the integrated design can effectively resist external interference.

[0075] In this embodiment, the capacitor C1, the resistor R5, the capacitor C4, the resistor R7 and the voltage stabilizing tube VD0 are used to cooperate to generate a starting voltage, and the driving module is used to generate a driving signal after obtaining the starting voltage;

[0076] Among them, the capacitor C1 and the resistor R4 are connected in parallel, one end of which is connected to the positive pole A+ of the input power supply, and the other end is connected to one end of the capacitor C4, one end of the resistor R7, one end of the resistor R8 and the emitter of the transistor V4.

[0077] The resistor R5 is used to discharge the charge accumulated in the capacitor C1.

[0078] Here, the input power supply triggers the above elements to generate a starting voltage, and then the driving module generates a driving signal to drive the whole device to run.

[0079] In this embodiment, the infrared light emitting diode U1.1, the infrared light sensitive triode U1.2 and the plug X2 are arranged.

[0080] The collector of the infrared light sensitive triode U1.2 is connected to the base of the transistor V5, and the emitter of the infrared light sensitive triode U1.2 is grounded.

[0081] The infrared light emitting diode U1.1 is connected to the plug X2, limited by the resistor R20 and emits infrared light.

[0082] ​When infrared phototransistor U1.2 is irradiated with infrared light, it is in the conducting state, which short-circuits the base current of transistor V5, causing transistor V5 to turn off, and then transistor V4 to turn off, thus cutting off the DC auxiliary power supply.

[0083] In this embodiment, the capacitor C7 in the protection module has different charging and discharging circuits, corresponding to different circuit states, so as to realize normal power supply and fault circuit interruption.

[0084] As an optional implementation, capacitor C7 discharges current during a fault, keeping transistor V3 conducting for a short time, thereby briefly cutting off the DC auxiliary power supply to the subsequent circuit. At this time, the entire circuit stops working.

[0085] Subsequently, after capacitor C7 has completely discharged, the DC auxiliary power supply resumes operation, the circuit resumes working, and the circuit fault is eliminated.

[0086] As another optional implementation, if the circuit fault is not eliminated after capacitor C7 has discharged completely, capacitor C7 will recharge and discharge again, and the entire circuit will stop working.

[0087] As can be seen, if the circuit fault is not eliminated, capacitor C7 will cycle through the process of storing and discharging electricity until the fault is cleared and the circuit resumes operation, at which point it will no longer store electricity. This process is known as "hiccup-type" protection, which continuously detects the fault status of the circuit and automatically restarts the circuit when the fault is cleared, thus improving ease of use.

[0088] In summary, this device can directly replace traditional fuses, is compatible with existing systems, and requires no rewiring. It operates on a single wire, using an oscillator to output two complementary high-level, short-term overlapping drive signals to control the on / off state of two MOSFETs. It also provides "hiccup-type" protection during faults and restores power after the fault is cleared.

Claims

1. A load-adjustable DC single-wire power pickup protection device, characterized in that, Comprise: The main circuit module, drive module and protection module are electrically connected; The main circuit module comprises transformers T1 and T2, the transformer T1 has a primary winding L1-1, a primary winding L1-2 and a secondary winding L1-3, the transformer T2 has a primary winding L2-1, a primary winding L2-2 and a secondary winding L2-3, the positive pole A+ of the input power supply is connected to the primary winding L2-1 and the primary winding L2-2 respectively, and the primary winding L1-1 is connected to the primary winding L2-1, and the primary winding L1-2 is connected to the primary winding L2-2; The transformer T1 is used to generate a DC auxiliary power supply, which is used to power the drive module, the positive pole of the DC auxiliary power supply is B+, the negative pole is B-, and B- is grounded; The main circuit module further comprises field effect transistor V1, field effect transistor V2, gate-source resistor R1, gate-source resistor R2, sampling resistor R0 and load resistor RL, the source of field effect transistor V1 is connected to one end of sampling resistor R0, and the other end of sampling resistor R0 is connected to one end of load resistor RL; The drive module uses integrated circuit D1, which has non-gate D1.1, non-gate D1.2, non-gate D1.3, non-gate D1.4, non-gate D1.5 and non-gate D1.6, and is composed of non-gate D1.1, non-gate D1.2, non-gate D1.3, non-gate D1.4 and non-gate D1.5 to form an oscillator, which is used to output different waveform drive signals to drive field effect transistor V1 and field effect transistor V2 to conduct or cut off; Among them, non-gate 1.3 connects the gate of field effect transistor V1 through parallel capacitor C3 and resistor R4, and outputs drive signal S(d) to field effect transistor V1, non-gate 1.4 connects the gate of field effect transistor V2 through parallel capacitor C2 and resistor R3, and outputs drive signal S(g) to field effect transistor V2; And, the transformer T2 is used to measure the current value of the load resistor RL; The protection module comprises voltage reference source N1, voltage reference source N2 and capacitor C7, voltage reference source N2 outputs high level through non-gate D1.6, charges capacitor C7 through diode VD5 and resistor R12, voltage reference source N1 connects the positive pole B+ of the DC auxiliary power supply through resistor R15, and voltage reference source N2 connects the positive pole B+ of the DC auxiliary power supply through resistor R16.

2. The load-regulatable DC single-wire power derivation protection device according to claim 1, characterized in that Comprise: The number of turns of the primary winding L1-1 and the primary winding L1-2 is the same, and the number of turns of the primary winding L2-1 and the primary winding L2-2 is the same; The two terminals of the primary winding L1-1, the primary winding L1-2, the primary winding L2-1 and the primary winding L2-2 are marked as * terminal and + terminal respectively; The positive pole A+ of the input power supply is connected to the different name terminals of the primary winding L1-1 and the primary winding L1-2 respectively.

3. The load-regulatable DC single-wire power derivation protection device of claim 1, wherein, Comprise: The sampling resistor R0 and the load resistor RL are combined to form a zero potential reference point, which provides potential reference for the drive module and the protection module.

4. The load-regulatable DC single-wire power derivation protection device of claim 1, wherein, Comprise: One end of resistor R19 is connected with one end of capacitor C11 and input end h of non gate D1.1, the other end of resistor R19 is connected with output end a of non gate D1.1, the other end of capacitor C11 is grounded, and the combination constitutes a square wave oscillator, and a square wave with duty ratio of 0.5 and frequency of 100KHz is output.

5. The load-regulatable DC single-wire power derivation protection device of claim 4, wherein, Comprise: The input end of non gate D1.2 is connected with output end a of non gate D1.1, the output end b of non gate D1.2 is connected with input end of non gate D1.5, capacitor C10 and input end of non gate D1.3, the output end e of non gate D1.5 is connected with one end of resistor R17 and cathode of diode VD1, the other end of resistor R17 is connected with anode of diode VD1 and input end f of non gate D1.

4.

6. The load-regulatable DC single-wire power derivation protection device of claim 5, wherein, Comprise: The waveform of output end a is opposite to the waveform of output end b; The rising edge of the waveform of input end c is delayed relative to the rising edge of the waveform of output end b due to the integral delay of resistor R18 and capacitor C10; The waveform of output end d is driving signal S(d), which is opposite to the waveform of output end c; The waveform of output end e is the same as the waveform of output end a; The rising edge of the waveform of input end f is delayed relative to the rising edge of the waveform of output end e due to the integral delay of resistor R17 and capacitor C9; The waveform of output end g is driving signal S(g), which is opposite to the waveform of input end f.

7. The load-regulatable DC single-wire power derivation protection device of claim 6, wherein, Comprise: The waveforms of driving signal S(d) and driving signal S(g) are complementary; The falling edge of driving signal S(d) is delayed relative to the rising edge of driving signal S(g), that is, driving signal S(d) and driving signal S(g) overlap in the high level half cycle; When driving signal S(d) is in the high level half cycle, driving signal S(g) is in the low level half cycle, field effect transistor V2 is cut off, field effect transistor V1 is turned on, and induced voltage is generated in secondary side coil L1-3 or secondary side coil L2-3; When driving signal S(g) is in the high level half cycle, driving signal S(d) is in the low level half cycle, field effect transistor V1 is cut off, field effect transistor V2 is turned on, and square wave voltage is generated in secondary side coil L1-3 or secondary side coil L2-3; When driving signal S(d) and driving signal S(g) are in the overlapping interval of the high level half cycle, field effect transistor V1 and field effect transistor V2 are both turned on, and alternating square wave voltage is output across secondary side coil L1-3 or secondary side coil L2-3.

8. The load-regulatable DC single-wire power derivation protection device of claim 7, wherein, Comprise: The alternating square wave voltage is rectified by rectifier bridge VC1 or rectifier bridge VC2 and a direct current auxiliary current is output, which is used to power the driving module, or as a detection current flowing through load resistor RL, or as a small power supply.

9. The load adjustable DC single wire power extraction protection device of claim 1, wherein, Comprise: Capacitor C1, resistor R5, capacitor C4, resistor R7 and voltage stabilizing tube VD0 are used to generate a starting voltage, and the driving module is used to generate a driving signal after the starting voltage is obtained; Wherein, capacitor C1 and resistor R5 are connected in parallel, one end of which is connected with positive electrode A+ of input power supply, the other end of which is connected with one end of capacitor C4, one end of resistor R7, one end of resistor R8 and emitter of transistor V4; Resistor R5 is used to discharge the charge accumulated in capacitor C1.

10. The load-regulatable DC single-wire power derivation protection device of claim 1, wherein, Comprise: An infrared light emitting diode U1.1, an infrared light sensitive triode U1.2 and a plug X2 are provided; The collector of the infrared light sensitive triode U1.2 is connected to the base of a transistor V5, and the emitter of the infrared light sensitive triode U1.2 is grounded; The infrared light emitting diode U1.1 is connected to the plug X2, and is current limited by a resistor R20 and emits infrared light; When the infrared light sensitive triode U1.2 is irradiated by infrared light, it is in a conducting state, and the base current of the transistor V5 is short-circuited, the transistor V5 is cut off, and then the transistor V4 is cut off, and the DC auxiliary power supply is cut off.

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