Electrical assembly for circuit breaker and circuit breaker

Abstract

The embodiment of the utility model provides an electrical assembly for a circuit breaker and the circuit breaker. The electrical component includes: a first substrate; an external power supply port disposed on the first substrate and electrically connected to an external power supply unit to receive an external voltage; a first voltage conversion circuit disposed on the first substrate and electrically connected to the external power supply port for converting the external voltage into an operating voltage; the energy storage capacitor is arranged on the first substrate and is electrically connected to the external power supply port so as to supply power to a tripping unit of the circuit breaker; and a functional load disposed on the first substrate and electrically connected to the first voltage conversion circuit to receive the operating voltage.

Description

Technical Field

[0001] The embodiments of this disclosure generally relate to the field of electrical equipment technology, and more specifically, to electrical components and circuit breakers for circuit breakers. Background Technology

[0002] A circuit breaker is an electrical component that can close, carry, and interrupt current under normal circuit conditions and can close, carry, and interrupt current under abnormal circuit conditions within a specified time.

[0003] The electrical components in a conventional circuit breaker can draw power from the main circuit through a current transformer, ensuring that the electrical components have sufficient energy to trigger the trip unit to trip under fault conditions such as overload or short circuit, thereby achieving fault protection function. Utility Model Content

[0004] In a first aspect of this disclosure, an electrical assembly for a circuit breaker is provided, the electrical assembly comprising: a first substrate; an external power supply port disposed on the first substrate and electrically connected to an external power supply unit to receive an external voltage; a first voltage conversion circuit disposed on the first substrate and electrically connected to the external power supply port for converting the external voltage into an operating voltage; an energy storage capacitor disposed on the first substrate and electrically connected to the external power supply port for supplying power to a tripping unit of the circuit breaker; and a functional load disposed on the first substrate and electrically connected to the first voltage conversion circuit to receive the operating voltage.

[0005] According to embodiments of this disclosure, when a high-power functional load needs to operate, it is powered by an external power supply unit, which simultaneously powers the energy storage capacitor. In this way, the energy storage capacitor has sufficient energy to drive the tripping mechanism, and the functional load can operate normally. The circuit breaker of the embodiments of this disclosure can resolve the contradiction between power supply capacity and power demand, and can improve power supply efficiency. Furthermore, the external power supply unit supplies power to the functional load through a first voltage conversion circuit, eliminating the need for multiple additional conversion circuits and other power supply components in the electrical components. This helps reduce the cost of electrical components and simplifies power management logic.

[0006] In some embodiments, the external power supply unit includes a second substrate and a second voltage conversion circuit disposed on the second substrate. The input terminal of the second voltage conversion circuit is electrically connected to an auxiliary power supply and is adapted to convert the auxiliary voltage of the auxiliary power supply into the external voltage. The output terminal of the second voltage conversion circuit is electrically connected to the external power supply port.

[0007] In some embodiments, the electrical component further includes a first diode and a second diode disposed on the first substrate, wherein the anodes of the first diode and the second diode are respectively electrically connected to the external power supply port, the cathode of the first diode is electrically connected to the first voltage conversion circuit, and the cathode of the second diode is electrically connected to the energy storage capacitor.

[0008] In some embodiments, the electrical component further includes a rectifier circuit and a third diode disposed on the first substrate. The input terminal of the rectifier circuit is electrically connected to the main circuit of the circuit breaker to draw power from the main circuit. The output terminal of the rectifier circuit is electrically connected to the anode of the third diode, and the cathode of the third diode and the cathode of the second diode are connected to a common node, which is electrically connected to the energy storage capacitor.

[0009] In some embodiments, the electrical component further includes a fourth diode disposed on the first substrate, the anode of the fourth diode being electrically connected to the common node, and the cathode of the fourth diode being electrically connected to the first voltage conversion circuit.

[0010] In some embodiments, the energy storage capacitor is electrically connected to the common node via a conductive branch, and the electrical component further includes a voltage detection circuit disposed on the first substrate. The voltage detection circuit is electrically connected to the common node via the conductive branch, and the voltage detection circuit is adapted to detect the voltage of the conductive branch or the energy storage capacitor for comparison with a threshold voltage.

[0011] In some embodiments, the electrical component further includes a switching element disposed on the first substrate, one end of the switching element being electrically connected to the output of the rectifier circuit, the other end of the switching element being connected to ground, and the switching element being configured to be turned on when the voltage detected by the voltage detection circuit is greater than or equal to the threshold voltage.

[0012] In some embodiments, the functional load includes a protection functional load and at least one digital functional load, the protection functional load and the at least one digital functional load being electrically connected to the first voltage conversion circuit, the protection functional load being adapted to implement the protection function of the circuit breaker, and the at least one digital functional load being adapted to implement the digital function of the circuit breaker.

[0013] In a second aspect of this disclosure, a circuit breaker is provided, comprising: any of the electrical components according to a first aspect of this disclosure; an external power supply unit, the input of which is electrically connected to an auxiliary power supply and the output of which is electrically connected to an external power supply port of the electrical component; and a current transformer, which is electrically connected to the rectifier circuit of the electrical component and is adapted to draw power from the main circuit of the circuit breaker.

[0014] It should be understood that the description in this section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein:

[0016] Figure 1 A schematic diagram of the structure of an electrical component, an external power supply unit, and a current transformer according to some embodiments of the present disclosure is shown.

[0017] Explanation of reference numerals in the attached figures:

[0018] 100 is an electrical component; 200 is an external power supply unit; 201 is a second base plate; 202 is a second voltage conversion circuit; 300 is a current transformer.

[0019] 1 is the first substrate; 2 is the external power supply port; 3 is the first voltage conversion circuit; 4 is the energy storage capacitor;

[0020] 5 represents a functional load, 51 represents a protective functional load, and 52 represents a digital functional load.

[0021] 61 is the first diode, 62 is the second diode, 63 is the third diode, and 64 is the fourth diode;

[0022] 7 represents the rectifier circuit;

[0023] 81 is a common node, and 82 is a conductive branch;

[0024] 9 is the voltage detection circuit; 10 is the switching element. Detailed Implementation

[0025] Embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0026] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0027] As described above, the electrical components in a conventional circuit breaker draw power from the main circuit via a current transformer to ensure sufficient energy to trigger the trip unit, thereby achieving fault protection. As circuit breakers add various functions, additional power is needed to supply the loads that implement those functions. However, conventional circuit breakers may or may not have main circuit current during operation, but in any case, sufficient energy must be ensured to trigger the trip unit and to supply power to the aforementioned loads. Embodiments of this disclosure provide an electrical component and circuit breaker for a circuit breaker to at least partially address the above-mentioned problems. In the following sections, [further details will be provided]. Figure 1 The principles of this disclosure are described.

[0028] Figure 1 A schematic diagram of the structure of an electrical component 100, an external power supply unit 200, and a current transformer 300 according to some embodiments of the present disclosure is shown. Figure 1 As shown, the electrical component 100 described herein includes a first substrate 1, an external power supply port 2, a first voltage conversion circuit 3, an energy storage capacitor 4, and a functional load 5. The first substrate 1 serves as a mounting carrier and may include, for example, a printed circuit board or a ceramic substrate. The external power supply port 2, the first voltage conversion circuit 3, the energy storage capacitor 4, and the functional load 5 are respectively disposed on the first substrate 1.

[0029] refer to Figure 1In some embodiments, the external power supply port 2 is electrically connected to the external power supply unit 200 to receive an external voltage. A first voltage conversion circuit 3 is electrically connected to the external power supply port 2 and is capable of converting the external voltage into an operating voltage. The first voltage conversion circuit 3 may, for example, include a step-down circuit. The functional load 5 is electrically connected to the first voltage conversion circuit 3 and is capable of receiving the operating voltage, thus enabling the functional load 5 to be powered. Furthermore, an energy storage capacitor 4 is electrically connected to the external power supply port 2, thus enabling the energy storage capacitor 4 to be powered. The energy storage capacitor 4 can power the tripping unit of the circuit breaker, thereby driving the tripping unit to operate.

[0030] It should be noted that the functional load 5 may include a protective functional load 51 and at least one digital functional load 52. The protective functional load 51 and the at least one digital functional load 52 can be electrically connected to the first voltage conversion circuit 3, thus enabling them to be powered. The protective functional load 51 can implement the protection function of the circuit breaker, and its power consumption is low. The at least one digital functional load 52 can implement the digital function of the circuit breaker, and its power consumption is higher.

[0031] For example, at least one digital functional load 52 may include communication functional loads, test functional loads, and diagnostic functional loads, etc., to realize the communication, testing, and diagnostic functions of the circuit breaker. It should be noted that the numbers, values, and numbers mentioned above and elsewhere in this disclosure are exemplary and are not intended to limit the scope of this disclosure in any way. Any other suitable numbers, values, and numbers are possible. For example, depending on the specific application scenario and requirements, the electrical component 100 may include more or fewer digital functional loads 52.

[0032] According to embodiments of this disclosure, when a high-power functional load 5 needs to operate, it is powered by an external power supply unit 200, which simultaneously powers the energy storage capacitor 4. In this way, the energy storage capacitor 4 has sufficient energy to drive the tripping mechanism, and the functional load 5 can operate normally. The circuit breaker of the embodiments of this disclosure can resolve the contradiction between power supply capacity and power demand, and can improve power supply efficiency. Furthermore, since the external power supply unit 200 supplies power to the functional load through the first voltage conversion circuit 3, the electrical component 100 does not need to be equipped with multiple conversion circuits and other power supply components, which helps to reduce the cost of the electrical component 100 and simplifies power management logic.

[0033] refer to Figure 1In some embodiments, the external power supply unit 200 may include a second substrate 201 and a second voltage conversion circuit 202. The second voltage conversion circuit 202 is disposed on the second substrate 201. The second substrate 201 may be designed independently of the first substrate 1 and may include, for example, a printed circuit board or a ceramic substrate. In this way, the electrical component 100 is disposed only on the first substrate 1, and components such as the second voltage conversion circuit 202 can be disposed on the second substrate 201 of the external device. This facilitates a simplification of the design of the first substrate 1, thereby reducing the cost of the electrical component 100.

[0034] Continue to refer to Figure 1 Furthermore, the input terminal of the second voltage conversion circuit 202 can be electrically connected to the auxiliary power supply and is adapted to convert the auxiliary voltage of the auxiliary power supply into an external voltage. The output terminal of the second voltage conversion circuit 202 can be electrically connected to the external power supply port 2. Thus, the auxiliary power supply can supply power to the electrical component 100 through the second voltage conversion circuit 202.

[0035] Continue to refer to Figure 1 In some embodiments, the electrical component 100 may further include a rectifier circuit 7 disposed on the first substrate 1. The input terminal of the rectifier circuit 7 may be electrically connected to the main circuit of the circuit breaker to draw power from the main circuit; for example, the rectifier circuit 7 may draw power from the main circuit via a current transformer 300. The output terminal of the rectifier circuit 7 may be electrically connected to the energy storage capacitor 4 and the first voltage conversion circuit 3. In this way, the rectifier circuit 7 can convert alternating current into direct current and supply power to the energy storage capacitor 4 and the first voltage conversion circuit 3.

[0036] Continue to refer to Figure 1 In some embodiments, the electrical component 100 may further include a first diode 61, a second diode 62, a third diode 63, and a fourth diode 64. The first diode 61, the second diode 62, the third diode 63, and the fourth diode 64 may be respectively disposed on the first substrate 1. The connection relationship and operating principle of the multiple diodes will be described below.

[0037] Continue to refer to Figure 1 Furthermore, the anodes of the first diode 61 and the second diode 62 are electrically connected to the external power supply port 2, respectively. The cathode of the first diode 61 is electrically connected to the first voltage conversion circuit 3. The cathode of the second diode 62 is electrically connected to the energy storage capacitor 4. In this way, the external power supply unit 200 can supply power to the first voltage conversion circuit 3 through the external power supply port 2 and the first diode 61, and the external power supply unit 200 can also supply power to the energy storage capacitor 4 through the external power supply port 2 and the second diode 62.

[0038] It should be noted that when the external power supply unit 200 is powered alone, if the trip unit performs a tripping action, the energy storage capacitor 4 needs to supply power to the trip unit and consumes a large amount of electrical energy, causing the voltage of the energy storage capacitor 4 to drop. After the trip unit performs the tripping action, the external power supply unit 200 needs to resupply the energy storage capacitor 4 through the external power supply port 2 and the second diode 62 until the energy storage capacitor 4 is fully charged. However, since the external power supply unit 200 is a voltage source, it can output zero current to the energy storage capacitor 4 after it is fully charged. The energy storage capacitor 4 can maintain a constant voltage, and the branch of the external power supply unit 200 that charges the energy storage capacitor 4 does not need to be turned off.

[0039] In addition, continue to refer to Figure 1 When the trip unit operates, causing the energy storage capacitor 4 to consume a large amount of electrical energy, the voltage V1 of the branch from the external power supply port 2 to the energy storage capacitor 4 will drop. However, since the energy storage capacitor 4 and the first voltage conversion circuit 3 are powered by different diodes, the voltage V2 of the branch from the external power supply port 2 to the first voltage conversion circuit 3 is not affected by the drop in voltage V1.

[0040] Continue to refer to Figure 1 Furthermore, at least one digital functional load 52 is only turned on when the external power supply unit 200 supplies power to the electrical component 100. Specifically, the control unit of the electrical component 100 can detect whether the external power supply unit 200 is connected. If the external power supply unit 200 is detected to be connected, the control unit can turn on at least one digital functional load 52. However, if the external power supply unit 200 is not detected to be connected, at least one digital functional load 52 is not turned on, and only the protection functional load 51 is turned on. In this way, even if the power consumption of at least one digital functional load 52 is large during the period when the trip unit operates and causes a voltage drop in V1, the external power supply unit 200 can still supply power to at least one digital functional load 52 through the first diode 61 to realize the digital function of the circuit breaker.

[0041] Continue to refer to Figure 1 Furthermore, the output of the rectifier circuit 7 can be electrically connected to the anode of the third diode 63. The cathode of the third diode 63 can be connected to the common node 81 along with the cathode of the second diode 62. The common node 81 can be electrically connected to the energy storage capacitor 4. In this way, the current transformer 300 can supply power to the energy storage capacitor 4 through the rectifier circuit 7, the third diode 63, and the common node 81.

[0042] Continue to refer to Figure 1Furthermore, the anode of the fourth diode 64 can be electrically connected to the common node 81. The cathode of the fourth diode 64 can be electrically connected to the first voltage conversion circuit 3. In this way, the current transformer 300 can supply power to the first voltage conversion circuit 3 through the rectifier circuit 7, the third diode 63, the common node 81, and the fourth diode 64. In addition, when the current transformer 300 is powered alone, the first voltage conversion circuit 3 only supplies power to the protection function load 51.

[0043] It should be noted that, on the one hand, since the voltage drop of one diode is lower than that of two diodes, the external power supply unit 200 preferentially supplies power to the first voltage conversion circuit 3 through the external power supply port 2 and the first diode 61. On the other hand, as mentioned above, even when the current transformer 300 is powered alone, it can simultaneously supply power to the energy storage capacitor 4 and the protection function load 51. However, if the trip unit operates, causing the energy storage capacitor 4 to consume a large amount of energy, the voltage of the energy storage capacitor 4 will drop. Since the fourth diode 64 can only be energized in one direction, and the power consumption of the protection function load 51 is low, the voltage at the first voltage conversion circuit 3 remains basically stable. Furthermore, the current transformer 300 can supply power to both the energy storage capacitor 4 and the protection function load 51 until the energy storage capacitor 4 is fully charged.

[0044] Continue to refer to Figure 1 In some embodiments, the energy storage capacitor 4 can be electrically connected to the common node 81 via the conductive branch 82. The electrical component 100 may also include a voltage detection circuit 9 disposed on the first substrate 1. The voltage detection circuit 9 can be electrically connected to the common node 81 via the conductive branch 82. In this way, the voltage detection circuit 9 can detect the voltage of the conductive branch 82 or the energy storage capacitor 4 and compare it with a threshold voltage.

[0045] Continue to refer to Figure 1 Furthermore, the electrical component 100 may also include a switching element 10 disposed on the first substrate 1. One end of the switching element 10 may be electrically connected to the output terminal of the rectifier circuit 7. The other end of the switching element 10 may be connected to ground. The switching element 10 may be configured to be turned on when the voltage detected by the voltage detection circuit 9 is greater than or equal to a threshold voltage.

[0046] Since the current transformer 300 is a current source, if it continues to supply power to the energy storage capacitor 4 when the detected voltage is greater than or equal to the threshold voltage, the voltage of the energy storage capacitor 4 will continue to rise, eventually damaging it. (Continue to refer to...) Figure 1In some embodiments, when the current transformer 300 supplies power to the energy storage capacitor 4, if the detected voltage is greater than or equal to a threshold voltage, the control unit can control the switching element 10 to conduct, and the rectifier circuit 7 is short-circuited and cannot supply power to the energy storage capacitor 4, thereby avoiding damage to the energy storage capacitor 4. Conversely, when the detected voltage is less than the threshold voltage, the control unit can control the switching element 10 to conduct. That is, the control unit can send pulse signals to control the opening and closing state of the switching element 10, so that the voltage of the energy storage capacitor 4 and the voltage at the first voltage conversion circuit 3 remain stable.

[0047] Furthermore, if the trip unit activates and causes the detected voltage to fall below the threshold voltage, the control unit can control the switching element 10 to turn off. The current transformer 300 then re-supply the energy storage capacitor 4 and the first voltage conversion circuit 3.

[0048] Continue to refer to Figure 1 Embodiments of this disclosure also provide a circuit breaker including an external power supply unit 200, a current transformer 300, and any of the electrical components 100 described above. The input terminal of the external power supply unit 200 can be electrically connected to an auxiliary power supply, and the output terminal of the external power supply unit 200 is electrically connected to the external power supply port 2 of the electrical component 100. The current transformer 300 is electrically connected to the rectifier circuit 7 of the electrical component 100 and is adapted to draw power from the main circuit of the circuit breaker.

[0049] Continue to refer to Figure 1 In some embodiments, the external power supply unit 200 may include a second substrate 201 and a second voltage conversion circuit 202 disposed on the second substrate 201. The second substrate 201 may, for example, include a printed circuit board or a ceramic substrate, etc. The input terminal of the second voltage conversion circuit 202 is electrically connected to an auxiliary power supply and is adapted to convert the auxiliary voltage of the auxiliary power supply into an external voltage. The output terminal of the second voltage conversion circuit 202 may be electrically connected to an external power supply port 2.

[0050] The electrical component 100 of the circuit breaker according to an embodiment of the present disclosure only has a first printed circuit board, and the second substrate 201 and the second voltage conversion circuit 202 are disposed on an external device. Furthermore, the electrical component 100 does not require additional multiple conversion circuits and other power supply components, which helps to reduce the size of the electrical component 100 and lower costs.

[0051] Furthermore, the second voltage conversion circuit 202 can convert the auxiliary voltage into an external voltage suitable for the operation of the first voltage conversion circuit 3 and the energy storage capacitor 4, so as to avoid the auxiliary power supply causing excessively high voltage pulses to the first voltage conversion circuit 3 and the energy storage capacitor 4.

[0052] In the following text, we will combine Figure 1Describe the operation of electrical component 100 when it is powered by different power sources.

[0053] When the current transformer 300 is powered alone, the digital function load 52 is not turned on. The current transformer 300 simultaneously supplies power to the energy storage capacitor 4 and the protection function load 51 through the rectifier circuit 7. The control module sends pulse signals to control the opening and closing state of the switching element 10 to keep the voltage of the energy storage capacitor 4 and the voltage at the first voltage conversion circuit 3 stable. When the trip unit operates and causes the voltage of the energy storage capacitor 4 to drop, the voltage at the first voltage conversion circuit 3 is not affected by the voltage drop. If the voltage detected by the voltage detection circuit 9 is less than the threshold voltage, the control unit can control the switching element 10 to open. The current transformer 300 resumes power supply to the energy storage capacitor 4 and the first voltage conversion circuit 3 until the energy storage capacitor 4 is fully charged.

[0054] When the external power supply unit 200 supplies power independently, the digital function load 52 is activated. The external power supply unit 200 simultaneously supplies power to the energy storage capacitor 4, the protection function load 51, and at least one digital function load 52 via the external power supply interface. When the trip unit operates, causing a voltage drop in V1, the voltage V2 is unaffected by the voltage drop in V1. Due to the decrease in voltage V2, the external power supply unit 200 resumes supplying power to the energy storage capacitor 4.

[0055] When the current transformer 300 and the external power supply unit 200 supply power simultaneously, the digital functional load 52 is turned on. The current transformer 300 and the external power supply unit 200 supply power to the energy storage capacitor 4, the protective functional load 51, and at least one digital functional load 52. The control module sends pulse signals to control the opening and closing state of the switching element 10 to keep the voltage of the energy storage capacitor 4 and the voltage at the first voltage conversion circuit 3 stable. When the trip unit operates and causes a voltage drop, the voltage at the first voltage conversion circuit 3 is not affected by the voltage drop. If the voltage detected by the voltage detection circuit 9 is less than the threshold voltage, the control unit can control the switching element 10 to open, and the current transformer 300 and the external power supply unit 200 will resume supplying power to the energy storage capacitor 4.

[0056] The power supply design according to embodiments of this disclosure can be applied to various circuit breakers to at least partially solve the above-mentioned problems. It should be understood that the power supply design according to embodiments of this disclosure can also be applied to other components, and the embodiments of this disclosure are not limiting in this regard.

[0057] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An electrical assembly (100) for a circuit breaker, characterized by, The electrical component (100) includes: First substrate (1); An external power supply port (2) is provided on the first substrate (1) and is electrically connected to an external power supply unit (200) to receive external voltage; A first voltage conversion circuit (3) is disposed on the first substrate (1) and electrically connected to the external power supply port (2) for converting the external voltage into a working voltage; An energy storage capacitor (4) is disposed on the first substrate (1) and electrically connected to the external power supply port (2) for supplying power to the tripping unit of the circuit breaker; and A functional load (5) is disposed on the first substrate (1) and electrically connected to the first voltage conversion circuit (3) to receive the operating voltage.

2. The electrical assembly (100) of claim 1, characterized in that The external power supply unit (200) includes a second substrate (201) and a second voltage conversion circuit (202) disposed on the second substrate (201). The input terminal of the second voltage conversion circuit (202) is electrically connected to an auxiliary power supply and is adapted to convert the auxiliary voltage of the auxiliary power supply into the external voltage. The output terminal of the second voltage conversion circuit (202) is electrically connected to the external power supply port (2).

3. The electrical assembly (100) of claim 1, wherein, The electrical component (100) further includes a first diode (61) and a second diode (62) disposed on the first substrate (1), the anode of the first diode (61) and the anode of the second diode (62) being electrically connected to the external power supply port (2), the cathode of the first diode (61) being electrically connected to the first voltage conversion circuit (3), and the cathode of the second diode (62) being electrically connected to the energy storage capacitor (4).

4. The electrical assembly (100) of claim 3, characterized in that The electrical component (100) further includes a rectifier circuit (7) and a third diode (63) disposed on the first substrate (1). The input terminal of the rectifier circuit (7) is electrically connected to the main circuit of the circuit breaker to draw power from the main circuit. The output terminal of the rectifier circuit (7) is electrically connected to the anode of the third diode (63). The cathode of the third diode (63) and the cathode of the second diode (62) are connected to a common node (81). The common node (81) is electrically connected to the energy storage capacitor (4).

5. The electrical assembly (100) of claim 4, characterized in that The electrical component (100) further includes a fourth diode (64) disposed on the first substrate (1), the anode of the fourth diode (64) being electrically connected to the common node (81), and the cathode of the fourth diode (64) being electrically connected to the first voltage conversion circuit (3).

6. The electrical assembly (100) of claim 4, wherein, The energy storage capacitor (4) is electrically connected to the common node (81) through a conductive branch (82). The electrical component (100) also includes a voltage detection circuit (9) disposed on the first substrate (1). The voltage detection circuit (9) is electrically connected to the common node (81) through the conductive branch (82). The voltage detection circuit (9) is adapted to detect the voltage of the conductive branch (82) or the energy storage capacitor (4) for comparison with a threshold voltage.

7. The electrical assembly (100) of claim 6, characterized in that The electrical component (100) further includes a switching element (10) disposed on the first substrate (1), one end of the switching element (10) being electrically connected to the output terminal of the rectifier circuit (7), the other end of the switching element (10) being connected to ground, and the switching element (10) being configured to be turned on when the voltage detected by the voltage detection circuit (9) is greater than or equal to the threshold voltage.

8. The electrical component (100) according to claim 1, characterized in that, The functional load (5) includes a protection functional load (51) and at least one digital functional load (52), the protection functional load (51) and the at least one digital functional load (52) being electrically connected to the first voltage conversion circuit (3), the protection functional load (51) being adapted to implement the protection function of the circuit breaker, and the at least one digital functional load (52) being adapted to implement the digital function of the circuit breaker.

9. A circuit breaker characterized by, The circuit breaker includes: The electrical component (100) according to any one of claims 1 to 8; An external power supply unit (200), the input of which is electrically connected to an auxiliary power supply, and the output of which is electrically connected to the external power supply port (2) of the electrical component (100); and A current transformer (300) is electrically connected to the rectifier circuit (7) of the electrical component (100) and is adapted to draw power from the main circuit of the circuit breaker.

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