Voltage and current limiting circuit for transformer output and explosion-proof floodlight power supply device

Abstract

This invention discloses a voltage and current limiting circuit for transformer output and a power supply device for explosion-proof floodlights, comprising: multiple voltage and current limiting modules connected in sequence, each module including a diode, a resettable fuse, a thyristor, and a resistor; this voltage and current limiting circuit can effectively limit the voltage and current jumps of the high-frequency pulse current output by the transformer, ensuring the stability and safety of the subsequent circuits, and its design is simple and low-cost, fully meeting the requirements of explosion-proof standards. Furthermore, due to the use of resettable fuses and thyristors, the voltage and current limiting circuit can maintain stable performance even under long-term high-load operation, without performance degradation or damage due to temperature rise, thereby greatly improving the overall safety and stability of the explosion-proof floodlight power supply device.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof limiting circuits, and more particularly to a voltage and current limiting circuit for transformer output and a power supply device for explosion-proof floodlights. Background Technology

[0002] In the power supply system of explosion-proof floodlights, the high-frequency pulsed electricity output from the transformer plays a crucial role as its core power supply method. However, this high-frequency pulsed electricity is often accompanied by significant voltage and current jumps, posing a serious challenge to the stability and safety of subsequent circuits. Especially in explosion-proof environments requiring low ripple output or with strict energy protection requirements, traditional power supply systems are often inadequate.

[0003] Explosion-proof floodlights, due to their unique application environment—potentially explosive gas or vapor environments—place extremely high demands on the safety of their power supply devices. Traditional solutions, such as using high-power diodes to limit voltage fluctuations, have several shortcomings. First, high-power diodes have large packages, increasing manufacturing costs. Second, in practical applications, high-power diodes often fail to meet the stringent safety factors stipulated by explosion-proof standards. Furthermore, under prolonged high-load operation, high-power diodes are prone to significant temperature rises, leading to performance degradation or even damage, thereby threatening the safety and stability of the entire explosion-proof floodlight power supply system. Summary of the Invention

[0004] Based on this, it is necessary to address the above-mentioned problems by proposing a voltage and current limiting circuit for transformer output and an explosion-proof floodlight power supply device. This device can not only effectively limit the voltage and current jumps of the high-frequency pulse current output by the transformer, ensuring the stability and safety of the subsequent circuit, but also has a simple design, low cost, and fully meets the requirements of explosion-proof standards. Furthermore, it can maintain stable performance even when subjected to high loads for a long time, without performance degradation or damage due to temperature rise, thereby greatly improving the overall safety and stability of the explosion-proof floodlight power supply device.

[0005] To achieve the above objectives, the present invention provides a voltage and current limiting circuit for transformer output in a first aspect. The voltage and current limiting circuit includes multiple voltage and current limiting modules connected in sequence. Each voltage and current limiting module includes a diode, a resettable fuse, a thyristor, and a resistor.

[0006] The cathode of the diode is connected to one end of the resettable fuse, the other end of the resettable fuse is connected to the anode of the thyristor, the cathode of the thyristor is connected to one end of the resistor, the other end of the resistor is connected to the anode of the diode and the control terminal of the thyristor, and the cathode of the thyristor is grounded.

[0007] When the voltage limiting and current limiting circuit receives the high-frequency pulse electricity output by the transformer, and the voltage of the high-frequency pulse electricity experiences a large jump, the diode conducts in reverse to trigger the thyristor to conduct, so that the voltage of the standard high-frequency pulse electricity output by the voltage limiting and current limiting circuit approaches 0.

[0008] When the voltage-limiting and current-limiting circuit receives the high-frequency pulse electricity output by the transformer, and the current of the high-frequency pulse electricity experiences a large jump, the self-resetting fuse exhibits high resistance, causing the current of the standard high-frequency pulse electricity output by the voltage-limiting and current-limiting circuit to be equal to 0.

[0009] Optionally, when the voltage limiting and current limiting circuit receives the high-frequency pulse electricity output by the transformer, and the voltage of the high-frequency pulse electricity does not change significantly, the diode is reverse-cut off, so that the voltage of the standard high-frequency pulse electricity output by the voltage limiting and current limiting circuit is equal to the voltage of the high-frequency pulse electricity.

[0010] When the voltage-limiting and current-limiting circuit receives the high-frequency pulse electricity output by the transformer, and the current of the high-frequency pulse electricity does not change significantly, the self-resetting fuse exhibits low resistance, causing the current of the standard high-frequency pulse electricity output by the voltage-limiting and current-limiting circuit to approach equal the current of the high-frequency pulse electricity.

[0011] Optionally, the anode of the thyristor in the preceding voltage and current limiting module is connected to the cathode of the diode in the following voltage and current limiting module, and the cathode of the thyristor in the preceding voltage and current limiting module is connected to one end of the resistor in the following voltage and current limiting module.

[0012] Optionally, the multi-level voltage and current limiting module can be a two-level voltage and current limiting module or a three-level voltage and current limiting module.

[0013] To achieve the above objectives, the present invention provides a second aspect of an explosion-proof floodlight power supply device, the device comprising an input circuit, a transformer, a voltage limiting and current limiting circuit as described in any one of the first aspects, and an output circuit connected in sequence.

[0014] The input circuit is connected to the first input terminal and the second input terminal of the transformer, respectively. The first output terminal of the transformer is connected to the cathode of the diode of the first-stage voltage and current limiting module in the voltage and current limiting circuit. The second output terminal of the transformer is connected to one end of the resistor of the first-stage voltage and current limiting module in the voltage and current limiting circuit. The anode and cathode of the thyristor of the last-stage voltage and current limiting module in the voltage and current limiting circuit are both connected to the output circuit.

[0015] The input circuit is used to receive AC mains power and convert the AC mains power into DC power.

[0016] The transformer is used to receive the direct current and convert the direct current into high-frequency pulsed current;

[0017] The voltage and current limiting circuit is used to receive the high-frequency pulse electricity and perform large-amplitude jump protection processing on the high-frequency pulse electricity to obtain standard high-frequency pulse electricity.

[0018] The output circuit is used to receive the standard high-frequency pulse electricity and use the standard high-frequency pulse electricity to power the explosion-proof floodlight.

[0019] Optionally, the device further includes a power control circuit;

[0020] The input circuit is connected to the power control circuit, and the power control circuit is connected to the first input terminal and the second input terminal of the transformer, respectively.

[0021] The power control circuit is used to receive the DC power and perform voltage and current regulation on the DC power to obtain standard DC power.

[0022] The transformer is used to receive the standard DC power and convert the standard DC power into the high-frequency pulse power.

[0023] Optionally, the input circuit includes a surge protection module and a rectifier module;

[0024] The surge protection module is connected to the rectifier module, and the rectifier module is connected to the power control circuit;

[0025] The surge protection module is used to receive the AC mains power and perform surge protection processing on the AC mains power to obtain standard AC mains power;

[0026] The rectifier module is used to receive the standard AC mains power and convert the standard AC mains power into the DC power.

[0027] Optionally, the surge protection module is used to divert the lightning current present in the AC mains to the ground when lightning current exists in the AC mains, so that the standard AC mains output by the surge protection module is free from lightning current.

[0028] Optionally, the output circuit includes a protection module and a power supply module;

[0029] In the voltage and current limiting circuit, the anode and cathode terminals of the thyristor in the last stage voltage and current limiting module are both connected to the protection module, and the protection module is connected to the power supply module.

[0030] The protection module is used to receive the standard high-frequency pulse current and perform overvoltage and overcurrent protection processing on the standard high-frequency pulse current to obtain the target high-frequency pulse current;

[0031] The power supply module is used to receive the target high-frequency pulse electricity and use the target high-frequency pulse electricity to power the explosion-proof floodlight.

[0032] Optionally, the protection module is configured to, when the voltage of the standard high-frequency pulse current is greater than a voltage threshold and / or the current of the standard high-frequency pulse current is greater than a current threshold, make the voltage of the target high-frequency pulse current output by the protection module equal to 0 and / or the current of the target high-frequency pulse current equal to 0.

[0033] When the voltage of the standard high-frequency pulse current is less than or equal to the voltage threshold, and / or the current of the standard high-frequency pulse current is less than or equal to the current threshold, the voltage of the target high-frequency pulse current output by the protection module is equal to the voltage of the standard high-frequency pulse current, and / or the current of the target high-frequency pulse current is equal to the current of the standard high-frequency pulse current.

[0034] The present invention provides the following advantages: The voltage and current limiting circuit comprises multiple voltage and current limiting modules connected in sequence. Each voltage and current limiting module includes a diode, a resettable fuse, a thyristor, and a resistor. The cathode of the diode is connected to one end of the resettable fuse, the other end of the resettable fuse is connected to the anode of the thyristor, the cathode of the thyristor is connected to one end of the resistor, and the other end of the resistor is connected to the anode of the diode and the control terminal of the thyristor, respectively. The cathode of the thyristor is grounded. When the voltage and current limiting circuit receives high-frequency pulse electricity from the transformer output, and the voltage of the high-frequency pulse electricity experiences a significant voltage jump, the diode reverse conducts to trigger the thyristor to conduct, causing the voltage of the standard high-frequency pulse electricity output by the voltage and current limiting circuit to approach 0. When a high-frequency pulse current is emitted, and the current of the high-frequency pulse current experiences a large jump, the self-resetting fuse exhibits high resistance, causing the current of the standard high-frequency pulse current output by the voltage-limiting and current-limiting circuit to be equal to 0. Therefore, a voltage-limiting and current-limiting circuit for the transformer output in an explosion-proof floodlight power supply device was designed. This circuit not only effectively limits the voltage and current jumps of the high-frequency pulse current output by the transformer, ensuring the stability and safety of the subsequent circuits, but also features a simple design, low cost, and full compliance with explosion-proof standards. Furthermore, due to the use of self-resetting fuses and thyristors, the voltage-limiting and current-limiting circuit maintains stable performance even under prolonged high-load operation, without performance degradation or damage due to temperature rise, thus greatly improving the overall safety and stability of the explosion-proof floodlight power supply device. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] in:

[0037] Figure 1 This is a schematic diagram of a voltage and current limiting circuit for a transformer output according to an embodiment of this application. Figure 1 ;

[0038] Figure 2 This is a schematic diagram of a voltage and current limiting circuit for a transformer output according to an embodiment of this application. Figure 2 ;

[0039] Figure 3 This is a schematic diagram of a voltage and current limiting circuit for a transformer output according to an embodiment of this application. Figure 3 ;

[0040] Figure 4 This is a schematic diagram of a voltage and current limiting circuit for a transformer output according to an embodiment of this application. Figure 4 ;

[0041] Figure 5 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 1 ;

[0042] Figure 6 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 2 ;

[0043] Figure 7 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 3 ;

[0044] Figure 8 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 4 . Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the power supply system of explosion-proof floodlights, the high-frequency pulsed electricity output from the transformer plays a crucial role as its core power supply method. However, this high-frequency pulsed electricity is often accompanied by significant voltage and current jumps, posing a serious challenge to the stability and safety of subsequent circuits. Especially in explosion-proof environments requiring low ripple output or with strict energy protection requirements, traditional power supply systems are often inadequate.

[0047] Explosion-proof floodlights, due to their unique application environment—potentially explosive gas or vapor environments—place extremely high demands on the safety of their power supply devices. Traditional solutions, such as using high-power diodes to limit voltage fluctuations, have several shortcomings. First, high-power diodes have large packages, increasing manufacturing costs. Second, in practical applications, high-power diodes often fail to meet the stringent safety factors stipulated by explosion-proof standards. Furthermore, under prolonged high-load operation, high-power diodes are prone to significant temperature rises, leading to performance degradation or even damage, thereby threatening the safety and stability of the entire explosion-proof floodlight power supply system.

[0048] To address the aforementioned issues, this application proposes a voltage and current limiting circuit for transformer output and an explosion-proof floodlight power supply device. This not only effectively limits the voltage and current fluctuations of the high-frequency pulsed current output by the transformer, ensuring the stability and safety of subsequent circuits, but also features a simple design, low cost, and full compliance with explosion-proof standards. Furthermore, it maintains stable performance even under prolonged high-load operation, without performance degradation or damage due to temperature rise, thus significantly improving the overall safety and stability of the explosion-proof floodlight power supply device. The specific implementation principle will be described in detail in the following embodiments.

[0049] This application provides a voltage and current limiting circuit for transformer output in its first aspect.

[0050] Please see Figure 1 This is a schematic diagram of a voltage and current limiting circuit for a transformer output in an embodiment of this application. Figure 1 The voltage and current limiting circuit 110 includes multiple voltage and current limiting modules 111 connected in sequence. Each voltage and current limiting module 111 includes a diode D, a resettable fuse F, a silicon controlled rectifier (SCR), and a resistor R.

[0051] In this circuit, the cathode of diode D is connected to one end of resettable fuse F, the other end of resettable fuse F is connected to the anode of silicon controlled rectifier (SCR), the cathode of SCR is connected to one end of resistor R, the other end of resistor R is connected to the anode of diode D and the control terminal of SCR, and the cathode of SCR is grounded.

[0052] In one feasible implementation, when the voltage limiting and current limiting circuit 110 receives the high-frequency pulse current output by the transformer TX, and the voltage of the high-frequency pulse current experiences a large jump, the diode D conducts in reverse to trigger the SCR to conduct, making the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 approach 0; when the voltage limiting and current limiting circuit 110 receives the high-frequency pulse current output by the transformer TX, and the current of the high-frequency pulse current experiences a large jump, the resettable fuse F exhibits high resistance, making the current of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 equal to 0.

[0053] It should be noted that the significant jump in voltage and / or current of the high-frequency pulsed current in this application refers to a jump in voltage and / or current that generates energy capable of affecting the explosion-proof requirements of the subsequent circuit. In other words, if the energy generated by the jump in voltage and / or current of the high-frequency pulsed current does not affect the explosion-proof requirements of the subsequent circuit, or if there is no jump in voltage and / or current of the high-frequency pulsed current, it is not considered a significant jump.

[0054] In some embodiments, the jump value of the voltage and / or current of the high-frequency pulsed current (the default jump value is 0 if no jump occurs) can be compared with the jump threshold. If the jump value is greater than the jump threshold, it is determined that the voltage and / or current of the high-frequency pulsed current has a large jump. The jump threshold includes the voltage jump threshold and / or the current jump threshold.

[0055] Furthermore, in this application, the voltage jump threshold can be the voltage drop that causes diode D to conduct in reverse, and the current jump threshold can be the current resistance that causes the resettable fuse F to exhibit high resistance.

[0056] In some embodiments, after the voltage limiting and current limiting circuit 110 receives the high-frequency pulse current output by the transformer TX, if the voltage of the high-frequency pulse current changes significantly, the diode D conducts in reverse to provide a trigger current for the control electrode of the thyristor SCR, causing the thyristor SCR to conduct, thereby making the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 approach 0.

[0057] It should be noted that the voltage of the high-frequency pulse current that experiences a large jump will pass through the voltage drop of diode D and the voltage drop of the SCR. After passing through these two voltage drops, the voltage of the high-frequency pulse current will become very low, thus causing the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 to approach 0.

[0058] In this embodiment, a voltage and current limiting circuit 110 for the transformer TX output in an explosion-proof floodlight power supply device is designed. This voltage and current limiting circuit 110 can not only effectively limit the voltage and current jumps of the high-frequency pulse current output by the transformer TX, ensuring the stability and safety of the subsequent circuit, but also has a simple design, low cost, and fully meets the requirements of explosion-proof standards. Furthermore, due to the use of self-resetting fuses F and silicon controlled rectifiers (SCRs), the voltage and current limiting circuit 110 can maintain stable performance even when subjected to high loads for a long time, and will not experience performance degradation or damage due to temperature rise, thereby greatly improving the overall safety and stability of the explosion-proof floodlight power supply device.

[0059] In one feasible implementation, when the voltage limiting and current limiting circuit 110 receives the high-frequency pulse current output by the transformer TX, and the voltage of the high-frequency pulse current does not change significantly, the diode D is reverse-biased and cut off, so that the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 is equal to the voltage of the high-frequency pulse current; when the voltage limiting and current limiting circuit 110 receives the high-frequency pulse current output by the transformer TX, and the current of the high-frequency pulse current does not change significantly, the self-resetting fuse F exhibits low resistance, so that the current of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 approaches equal to the current of the high-frequency pulse current.

[0060] It should be noted that the statement that the voltage and / or current of the high-frequency pulsed electricity in this application did not show a significant jump means that the energy generated by the jump in the voltage and / or current of the high-frequency pulsed electricity is not enough to endanger the explosion-proof requirements of the subsequent circuit, or that the voltage and / or current of the high-frequency pulsed electricity did not show a jump.

[0061] In some embodiments, after the voltage limiting and current limiting circuit 110 receives the high-frequency pulse current output by the transformer TX, if the voltage of the high-frequency pulse current does not change significantly, the diode D is reverse-biased and cannot provide trigger current to the control electrode of the thyristor SCR, causing the thyristor SCR to be cut off, thereby making the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 equal to the voltage of the high-frequency pulse current.

[0062] It should be noted that the voltage of the high-frequency pulse current that does not exhibit a large jump does not experience the voltage drop of the diode D and the voltage drop of the SCR. Therefore, the voltage of the high-frequency pulse current will not cause a voltage drop loss. Thus, the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 is equal to the voltage of the high-frequency pulse current.

[0063] In this embodiment, when the voltage and / or current of the high-frequency pulse current does not change significantly, the diode D reverse cuts off and / or the self-resetting fuse F presents low resistance. At this time, the voltage and current limiting circuit 110 is equivalent to a simple on / off switch and will not make any modification to the high-frequency pulse current, ensuring that its output voltage and / or current are consistent with the input voltage and / or current.

[0064] Similarly, in the above embodiment, when the voltage and / or current of the high-frequency pulsed current undergoes a large jump, the voltage and current limiting circuit 110 will trigger the conduction of the thyristor SCR through the reverse conduction of the diode D and / or the self-resetting fuse F will present low resistance, thereby limiting the jump amplitude of the voltage and / or current and protecting the subsequent circuit from damage.

[0065] In other words, the voltage and current limiting circuit 110 of this application can achieve dual control of high-frequency pulse current through different state switching: ensuring the accuracy of output voltage and current during normal operation; and effectively limiting the voltage and current jump amplitude during abnormal operation to protect the safety of subsequent circuits.

[0066] based on Figure 1 Please see Figure 2 This is a schematic diagram of a voltage and current limiting circuit for a transformer output in an embodiment of this application. Figure 2 The anode of the SCR in the preceding voltage and current limiting module 111 is connected to the cathode of the diode D in the following voltage and current limiting module 111, and the cathode of the SCR in the preceding voltage and current limiting module 111 is connected to one end of the resistor R in the following voltage and current limiting module 111.

[0067] In this embodiment of the application, by connecting the multi-level voltage and current limiting modules 111, multi-level voltage and / or current limiting can be achieved, further improving the voltage and current limiting capability of the entire circuit.

[0068] It is understandable that each voltage and current limiting module 111 can limit the voltage and current of high-frequency pulse electricity. Connecting multiple voltage and current limiting modules 111 can superimpose the voltage and current limiting effects to achieve a higher total voltage and current limiting effect.

[0069] In addition, the multi-stage connection structure can improve the performance of the voltage and current limiting circuit 110, making it more robust and reliable, and better protecting the safety of subsequent circuits.

[0070] based on Figure 2 Please see Figure 3 This is a schematic diagram of a voltage and current limiting circuit for a transformer output in an embodiment of this application. Figure 3 And see Figure 4 This is a schematic diagram of a voltage and current limiting circuit 110 for the TX output of a transformer in an embodiment of this application. Figure 4The multi-level voltage and current limiting module 111 is either a two-level voltage and current limiting module 111 or a three-level voltage and current limiting module 111.

[0071] in, Figure 3 The multi-stage voltage and current limiting module 111 in the voltage and current limiting circuit 110 shown is a two-stage voltage and current limiting module 111. Figure 4 The multi-stage voltage and current limiting module 111 in the voltage and current limiting circuit 110 shown is a three-stage voltage and current limiting module 111.

[0072] In this embodiment of the application, it is preferable to design the multi-stage voltage and current limiting module 111 in the voltage and current limiting circuit 110 as a two-stage voltage and current limiting module 111 or a three-stage voltage and current limiting module 111, so as to effectively limit the voltage and current jump amplitude and protect the safety of the subsequent circuit.

[0073] In a second aspect, this application provides an explosion-proof floodlight power supply device.

[0074] based on Figure 1 Please see Figure 5 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 1 The device includes an input circuit 510, a transformer TX, a voltage and current limiting circuit 110 as described in any of the first aspects, and an output circuit 520 connected in sequence.

[0075] The input circuit 510 is connected to the first and second input terminals of the transformer TX, respectively. The first output terminal of the transformer TX is connected to the cathode of the diode D of the first-stage voltage and current limiting module 111 in the voltage and current limiting circuit 110. The second output terminal of the transformer TX is connected to one end of the resistor R of the first-stage voltage and current limiting module 111 in the voltage and current limiting circuit 110. The anode and cathode of the thyristor SCR of the last-stage voltage and current limiting module 111 in the voltage and current limiting circuit 110 are both connected to the output circuit 520.

[0076] In one feasible implementation, the input circuit 510 is used to receive AC mains power and convert it into DC power; the transformer TX is used to receive DC power and convert it into high-frequency pulse power; the voltage and current limiting circuit 110 is used to receive the high-frequency pulse power and perform large-amplitude jump protection processing on the high-frequency pulse power to obtain standard high-frequency pulse power; the output circuit 520 is used to receive the standard high-frequency pulse power and use the standard high-frequency pulse power to power the explosion-proof floodlight 530.

[0077] In some embodiments, the large voltage jump processing includes: when the voltage of the high-frequency pulse current experiences a large voltage jump, diode D is reverse-biased to trigger the SCR to conduct, causing the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 to approach 0; when the current of the high-frequency pulse current experiences a large voltage jump, the resettable fuse F exhibits high resistance, causing the current of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 to be equal to 0; when the voltage of the high-frequency pulse current does not experience a large voltage jump, diode D is reverse-biased to cut off, causing the voltage of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 to be equal to the voltage of the high-frequency pulse current; when the current of the high-frequency pulse current does not experience a large voltage jump, the resettable fuse F exhibits low resistance, causing the current of the standard high-frequency pulse current output by the voltage limiting and current limiting circuit 110 to approach the current of the high-frequency pulse current.

[0078] In this embodiment, a novel explosion-proof floodlight power supply device is designed. This device, through an advanced voltage and current limiting circuit 110, effectively limits the voltage and current fluctuations of the high-frequency pulse current output by the transformer TX, ensuring the stability and safety of the subsequent circuits. Furthermore, its design is simple and inexpensive, fully meeting the requirements of explosion-proof standards. Moreover, the use of a self-resetting fuse F and a silicon controlled rectifier (SCR) ensures that the voltage and current limiting circuit 110 maintains stable performance even under prolonged high-load operation, preventing performance degradation or damage due to temperature rise. This significantly improves the overall safety and stability of the explosion-proof floodlight power supply device.

[0079] based on Figure 5 Please see Figure 6 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 2 The device also includes a power control circuit 610.

[0080] The input circuit 510 is connected to the power control circuit 610, and the power control circuit 610 is connected to the first input terminal and the second input terminal of the transformer TX, respectively.

[0081] In one feasible implementation, the power control circuit 610 is used to receive DC power and perform voltage and current regulation on the DC power to obtain standard DC power; the transformer TX is used to receive standard DC power and convert the standard DC power into high-frequency pulse power.

[0082] In this embodiment, the introduction of the power control circuit 610 enables more precise voltage and current regulation, thereby further improving the quality of the standard DC power received by the transformer TX. This not only improves the quality of the high-frequency pulse power but also ensures that the explosion-proof floodlight 530 operates more stably and safely.

[0083] In addition, the power control circuit 610 can ensure that the standard DC output meets the power supply requirements of the explosion-proof floodlight 530 by precisely regulating the voltage and current of the DC output from the input circuit 510.

[0084] based on Figure 6 Please see Figure 7 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 3 The input circuit 510 includes a surge protection module 511 and a rectifier module 512.

[0085] The surge protection module 511 is connected to the rectifier module 512, and the rectifier module 512 is connected to the power control circuit 610.

[0086] In one feasible implementation, the surge protection module 511 is used to receive AC mains power and perform surge protection processing on the AC mains power to obtain standard AC mains power; the rectifier module 512 is used to receive standard AC mains power and convert the standard AC mains power into DC power.

[0087] It should be noted that, since the explosion-proof floodlight 530 has very high requirements for power quality and is very sensitive to voltage and current fluctuations, this application further introduces a surge protection module 511 and a rectifier module 512.

[0088] In this embodiment, by introducing a surge protection module 511 and a rectifier module 512, the safety of the entire power supply device can be effectively improved. In the field environment, AC mains power may be affected by external interference such as lightning, generating lightning current, which can threaten the downstream circuits. The surge protection module 511 acts as a safety valve, effectively protecting the downstream circuits from lightning strikes, thereby ensuring the safe operation of the downstream circuits. The AC mains waveform is alternating and is not suitable as a direct power source for the explosion-proof floodlight 530. The rectifier module 512 converts the AC mains power into DC power, providing a stable, unidirectional voltage supply, laying the foundation for the operation of the downstream circuits.

[0089] Furthermore, by introducing the lightning protection module 511 and the rectifier module 512, the power supply device for the explosion-proof floodlight can be made more complete, and can better ensure safe and stable operation in the explosion-proof environment.

[0090] In one feasible implementation, the surge protection module 511 is used to introduce the surge current present in the AC mains to the ground when there is a surge current in the AC mains, so that there is no surge current in the standard AC mains output by the surge protection module 511.

[0091] It should be noted that safety is of paramount importance for explosion-proof floodlight power supply devices in explosion-proof environments. If the AC mains power is interfered with by lightning current, it may damage the downstream circuits or even cause an explosion. Therefore, it is necessary to introduce a surge protection module 511 to protect the downstream circuits from lightning damage.

[0092] In this embodiment, when there is lightning current in the AC mains power, the lightning protection module 511 can guide the lightning current into the ground through a specific path, thereby diverting the lightning current away from the explosion-proof floodlight power supply device, ensuring the safety of the standard AC mains output, avoiding damage to the explosion-proof floodlight 530 and the entire power supply device from the lightning current, and ensuring the safe and stable operation of the explosion-proof floodlight power supply device in the explosion-proof environment.

[0093] based on Figure 7 Please see Figure 8 This is a schematic diagram of a power supply device for an explosion-proof floodlight in an embodiment of this application. Figure 4 The output circuit 520 includes a protection module 521 and a power supply module 522.

[0094] In the voltage and current limiting circuit 110, the anode and cathode terminals of the SCR in the last stage voltage and current limiting module 111 are both connected to the protection module 521, and the protection module 521 is connected to the power supply module 522.

[0095] In one feasible implementation, the protection module 521 is used to receive the standard high-frequency pulse electricity and perform overvoltage and overcurrent protection processing on the standard high-frequency pulse electricity to obtain the target high-frequency pulse electricity; the power supply module 522 is used to receive the target high-frequency pulse electricity and use the target high-frequency pulse electricity to power the explosion-proof floodlight 530.

[0096] It should be noted that the purpose of the voltage and current limiting circuit 110 is to limit the voltage and current jumps of the high-frequency pulse electricity output by the transformer TX, ensuring that large voltage and current jumps will not cause energy impact on the subsequent circuit (the subsequent circuit here includes the protection module 521). The purpose of the protection module 521 is to provide overvoltage and overcurrent protection for the power supply of the explosion-proof floodlight 530, ensuring that high voltage and high current will not damage the power supply module 522 and the explosion-proof floodlight 530. In other words, the functions of the voltage and current limiting circuit 110 and the protection module 521 are different.

[0097] In this embodiment, by introducing a protection module 521 and a power supply module 522, the standard high-frequency pulse current is protected with minimum safe voltage and current and output to power the explosion-proof floodlight 530, thus ensuring the safe operation of the explosion-proof floodlight 530.

[0098] Understandably, the protection module 521, by providing overvoltage and overcurrent protection for the standard high-frequency pulse electricity, can effectively prevent damage to the explosion-proof floodlight 530 caused by high voltage and high current, thereby improving safety and reliability. The power supply module 522, by outputting the protected standard high-frequency pulse electricity to the explosion-proof floodlight 530, ensures a stable power supply in the explosion-proof environment and prevents faults and potential dangers caused by unstable voltage or current.

[0099] In addition, by introducing the protection module 521 and the power supply module 522, the safety of the explosion-proof floodlight power supply device can be effectively improved, further ensuring safe and stable operation in the explosion-proof environment.

[0100] In one feasible implementation, the protection module 521 is configured to, when the voltage of the standard high-frequency pulse current is greater than a voltage threshold and / or the current of the standard high-frequency pulse current is greater than a current threshold, make the voltage of the target high-frequency pulse current output by the protection module 521 equal to 0 and / or the current of the target high-frequency pulse current equal to 0; and when the voltage of the standard high-frequency pulse current is less than or equal to a voltage threshold and / or the current of the standard high-frequency pulse current is less than or equal to a current threshold, make the voltage of the target high-frequency pulse current output by the protection module 521 equal to the voltage of the standard high-frequency pulse current and / or the current of the target high-frequency pulse current equal to the current of the standard high-frequency pulse current.

[0101] The voltage and current thresholds can be set by the operator based on extensive experience, experiments, or statistics. Alternatively, they can be set by the operator according to actual needs.

[0102] In this embodiment, the protection module 521 limits the output voltage and current of the high-frequency pulsed electricity by setting voltage and current thresholds to prevent them from exceeding safety boundaries, thereby protecting the normal operation of the downstream circuit and the explosion-proof floodlight 530. That is, when the voltage of the standard high-frequency pulsed electricity exceeds the voltage threshold or the current exceeds the current threshold, the protection module 521 will reduce the voltage or current of the target high-frequency pulsed electricity to 0, thereby preventing overvoltage or overcurrent from damaging the explosion-proof floodlight 530. When the voltage and current of the standard high-frequency pulsed electricity are both within the safe range, the protection module 521 will directly transmit the output voltage and current of the target high-frequency pulsed electricity to the explosion-proof floodlight 530 to maintain its original function.

[0103] In addition, through this design, the protection module 521 can effectively isolate the explosion-proof floodlight 530, ensuring its safe and stable operation in an explosion-proof environment.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A voltage and current limiting circuit for a transformer output, characterized by The voltage and current limiting circuit includes multiple voltage and current limiting modules connected in sequence. Each voltage and current limiting module includes a diode, a resettable fuse, a thyristor, and a resistor. The cathode of the diode is connected to one end of the resettable fuse, the other end of the resettable fuse is connected to the anode of the thyristor, the cathode of the thyristor is connected to one end of the resistor, the other end of the resistor is connected to the anode of the diode and the control terminal of the thyristor, and the cathode of the thyristor is grounded. When the voltage limiting and current limiting circuit receives the high-frequency pulse electricity output by the transformer, and the voltage of the high-frequency pulse electricity experiences a large jump, the diode conducts in reverse to trigger the thyristor to conduct, so that the voltage of the standard high-frequency pulse electricity output by the voltage limiting and current limiting circuit approaches 0. When the voltage-limiting and current-limiting circuit receives the high-frequency pulse electricity output by the transformer, and the current of the high-frequency pulse electricity experiences a large jump, the self-resetting fuse exhibits high resistance, causing the current of the standard high-frequency pulse electricity output by the voltage-limiting and current-limiting circuit to be equal to 0.

2. The voltage and current limiting circuit of claim 1, wherein When the voltage limiting and current limiting circuit receives the high-frequency pulse electricity output by the transformer, and the voltage of the high-frequency pulse electricity does not change significantly, the diode is reverse-cut off, so that the voltage of the standard high-frequency pulse electricity output by the voltage limiting and current limiting circuit is equal to the voltage of the high-frequency pulse electricity. When the voltage-limiting and current-limiting circuit receives the high-frequency pulse electricity output by the transformer, and the current of the high-frequency pulse electricity does not change significantly, the self-resetting fuse exhibits low resistance, causing the current of the standard high-frequency pulse electricity output by the voltage-limiting and current-limiting circuit to approach equal the current of the high-frequency pulse electricity.

3. The voltage-limiting and current-limiting circuit according to any one of claims 1 to 2, characterized in that, The anode of the thyristor in the preceding voltage and current limiting module is connected to the cathode of the diode in the following voltage and current limiting module, and the cathode of the thyristor in the preceding voltage and current limiting module is connected to one end of the resistor in the following voltage and current limiting module.

4. The voltage and current limiting circuit according to claim 3, characterized in that, The multi-level voltage and current limiting module is either a two-level or a three-level voltage and current limiting module.

5. A power supply device for an explosion-proof floodlight, characterized in that, The device includes an input circuit, a transformer, a voltage limiting and current limiting circuit as described in any one of claims 1 to 4, and an output circuit connected in sequence. The input circuit is connected to the first input terminal and the second input terminal of the transformer, respectively. The first output terminal of the transformer is connected to the cathode of the diode of the first-stage voltage and current limiting module in the voltage and current limiting circuit. The second output terminal of the transformer is connected to one end of the resistor of the first-stage voltage and current limiting module in the voltage and current limiting circuit. The anode and cathode of the thyristor of the last-stage voltage and current limiting module in the voltage and current limiting circuit are both connected to the output circuit. The input circuit is used to receive AC mains power and convert the AC mains power into DC power. The transformer is used to receive the direct current and convert the direct current into high-frequency pulsed current; The voltage and current limiting circuit is used to receive the high-frequency pulse electricity and perform large-amplitude jump protection processing on the high-frequency pulse electricity to obtain standard high-frequency pulse electricity. The output circuit is used to receive the standard high-frequency pulse electricity and use the standard high-frequency pulse electricity to power the explosion-proof floodlight.

6. The apparatus according to claim 5, characterized in that, The device also includes a power control circuit; The input circuit is connected to the power control circuit, and the power control circuit is connected to the first input terminal and the second input terminal of the transformer, respectively. The power control circuit is used to receive the DC power and perform voltage and current regulation on the DC power to obtain standard DC power. The transformer is used to receive the standard DC power and convert the standard DC power into the high-frequency pulse power.

7. The apparatus according to claim 6, characterized in that, The input circuit includes a surge protection module and a rectifier module; The surge protection module is connected to the rectifier module, and the rectifier module is connected to the power control circuit; The surge protection module is used to receive the AC mains power and perform surge protection processing on the AC mains power to obtain standard AC mains power; The rectifier module is used to receive the standard AC mains power and convert the standard AC mains power into the DC power.

8. The apparatus according to claim 7, characterized in that, The surge protection module is used to divert the lightning current present in the AC mains power to the ground when lightning current exists, so that the standard AC mains power output by the surge protection module is free from lightning current.

9. The apparatus according to claim 5, characterized in that, The output circuit includes a protection module and a power supply module; In the voltage and current limiting circuit, the anode and cathode terminals of the thyristor in the last stage voltage and current limiting module are both connected to the protection module, and the protection module is connected to the power supply module. The protection module is used to receive the standard high-frequency pulse current and perform overvoltage and overcurrent protection processing on the standard high-frequency pulse current to obtain the target high-frequency pulse current; The power supply module is used to receive the target high-frequency pulse electricity and use the target high-frequency pulse electricity to power the explosion-proof floodlight.

10. The apparatus according to claim 9, characterized in that, The protection module is used to ensure that the voltage of the target high-frequency pulse current output by the protection module is equal to 0 and / or the current of the target high-frequency pulse current is equal to 0 when the voltage of the standard high-frequency pulse current is greater than a voltage threshold and / or the current of the standard high-frequency pulse current is greater than a current threshold. When the voltage of the standard high-frequency pulse current is less than or equal to the voltage threshold, and / or the current of the standard high-frequency pulse current is less than or equal to the current threshold, the voltage of the target high-frequency pulse current output by the protection module is equal to the voltage of the standard high-frequency pulse current, and / or the current of the target high-frequency pulse current is equal to the current of the standard high-frequency pulse current.

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