변압기 용 복합 PTC 서머 스터, 전환 전력

복합 PTC 서머 스터는 열적으로 결합 된 조합을 사용합니다, VDR VARISTOR 및 PTC 서머 스터를 밀접하게 맞추고 캡슐화. 전원 미터 및 기타 전원 공급 장치의 전원 공급 장치 및 변압기 1 차 회로를 주로 사용하는 데 사용됩니다., 포괄적 인 전류 및 전압 보호를 제공합니다.

A composite PTC thermistor is an electronic component that combines positive temperature coefficient (PTC) characteristics with overvoltage protection, primarily used for dual overcurrent and overvoltage protection. 복합 PTC 서머 스터는 열적으로 결합 된 조합을 사용합니다, VDR VARISTOR 및 PTC 서머 스터를 밀접하게 맞추고 캡슐화. 전원 미터 및 기타 전원 공급 장치의 전원 공급 장치 및 변압기 1 차 회로를 주로 사용하는 데 사용됩니다., 포괄적 인 전류 및 전압 보호를 제공합니다. This solves the difficulties associated with using a single PTC thermistor with transformers. Instruments and equipment protected by a PTC thermistor may not function properly under overvoltage or overcurrent conditions, and low-temperature instruments may not be protected by the PTC when abnormalities occur.

The following is an analysis of its core features and applications:

나. Structure and Principle

Material Composition: Typically made from a polyolefin resin, polyethylene, or epoxy resin matrix, conductive particles such as carbon black and vanadium oxide are incorporated. 실온에서, the conductive particles form continuous conductive chains, resulting in low resistivity. When the temperature rises to the polymer melting point, the matrix expands, breaking the conductive chains and causing a sudden increase in resistivity (PTC effect). Composite Design: Some models integrate a PTC thermistor and a varistor (VDR) into a single package, achieving dual overcurrent and overvoltage protection through thermal coupling. 예를 들어, during an overvoltage event, the varistor absorbs energy and generates heat, triggering a jump in the PTC’s resistance, limiting current and reducing voltage by 4%.

PTC Thermistor Application Circuit Design

PTC Thermistor Application Circuit Design

II. Performance Characteristics
RISE-TO-RESISTANCE RATIO: The resistance can vary by 5-10 orders of magnitude within a narrow temperature range, making it suitable as a thermal switch element.
RESPONSIBILITY: After actuation, it takes a long time to cool down before returning to its initial state, resulting in a slow response.
SELF-RECOVERY: Automatically returns to a low-resistance state after the fault is resolved, eliminating the need for replacement.

III. Typical Applications
Home Appliances and Industrial: Used for overcurrent protection in equipment such as electric water heaters, 모터, 그리고 변압기.
Power Meters: Provides combined overvoltage and overcurrent protection in smart meters and switching power supplies.
자동차 전자 제품: Used in temperature monitoring applications such as engine control and air conditioning systems.
When a varistor absorbs large amounts of energy, 뜨거워질 거야. Due to thermal coupling, the temperature of the PTC thermistor also rises. 뿐만 아니라, the thermistor itself heats up due to the increased current. When the temperature reaches the PTC thermistor’s switching temperature, its resistance jumps, and the current decreases sharply. 동시에, the voltage drop across the thermistor increases significantly, reducing the voltage across the varistor and allowing only a small leakage current to flow. This reduces the voltage of the protected circuit to within the normal operating voltage range, allowing the power meter to operate normally.

IV. Selection Parameters
The following parameters should be considered during selection:
Operating current (It) and non-operating current (Ih);
Curie temperature (Tc, typically 115±7°C);
Varistor voltage (V) and maximum operating voltage (Vmax).

Common models of composite thermistors

모델 Curie Actuating Non-Actuating Varisor 평가 치수
온도 현재의 현재의 전압 Maximum Operating
(25℃) (60℃) (25℃) 전압
Tc(℃) It(엄마) Ih(엄마) V(V) Vmax(V) Dmax Hmax
SPMZB-10S300-500RM/14D900 115±7 250 70 90 65 16 8
SPMZB-08S300-600RM/14D121 115±7 200 60 120 65 16 8
SPMZB-08S400-800RM/14D181 115±7 200 50 180 120 16 8
SPMZB-10S300-500RM/14D181 115±7 250 70 180 120 16 8
SPMZB-06S900-161RM/10D391 115±7 150 30 390 265 12 8
SPMZB-06S151-251RM/10D391 115±7 120 25 390 265 12 8
SPMZB-08S400-800RM/12D391 115±7 200 50 390 265 14 8
SPMZB-08S600-121RM/12D391 115±7 180 40 390 265 14 8
SPMZB-08S600-121RM/14D391 115±7 180 40 390 265 16 8
SPMZB-08S800-161RM/14D391 115±7 160 35 390 265 16 8
SPMZB-10S300-500RM/14D391 115±7 250 90 390 265 16 10
SPMZB-10S400-800RM/14D391 115±7 220 70 390 265 16 10
SPMZB-10S400-800RM/14D471 115±7 220 70 470 330 16 10
SPMZB-16S200-300RM/20D391 115±7 450 130 390 265 22 10

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