Unlock instant, AI-driven research and patent intelligence for your innovation.

Circuit breaker PTC thermal protection circuit

A circuit breaker and thermal protection technology, which is applied to emergency protection circuit devices, automatic disconnection emergency protection devices, circuit devices, etc., can solve problems such as high cost, large error, and inconvenient adjustment, and achieve fewer components, reduced production and The effect of trimming timing, simplifying power conversion and voltage conversion

Pending Publication Date: 2021-06-11
真兰电气(上海)有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the problem of high cost, inconvenient adjustment and large error of the thermal protection scheme of the existing circuit breaker

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Circuit breaker PTC thermal protection circuit
  • Circuit breaker PTC thermal protection circuit
  • Circuit breaker PTC thermal protection circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, a circuit breaker PTC thermal protection circuit of the present invention includes a voltage conversion module, a power conversion module, a voltage reference module, a voltage comparison module and a switching device for controlling magnetic flux action, CN1-CN4 are circuit breaker contacts, and PTC1-PTC4 It is a heat sensitive element, fixed on the contact of the circuit breaker. The voltage conversion module is not limited to a three-terminal voltage regulator, and other forms such as Zener diodes (zener diodes) can be used.

[0024] The voltage conversion module is connected to the circuit breaker contacts CN1-CN4 through the power conversion module, the voltage comparison module is a comparator, the switching device is a MOS transistor Q2, the two ends of the PTC element and the adjustment end of the resistor R2 are connected to the input end of the comparator, and the comparator The output terminal of the MOS transistor Q2 is connected ...

Embodiment 2

[0027] Such as figure 2 As shown, a circuit breaker PTC thermal protection circuit of the present invention includes a voltage conversion module, a power conversion module, a voltage reference module, a voltage comparison module and a switching device for controlling magnetic flux action, CN1-CN4 are circuit breaker contacts, and PTC1-PTC4 It is a heat sensitive element, fixed on the contact of the circuit breaker. The voltage conversion module is not limited to a three-terminal voltage regulator, and other forms such as Zener diodes (zener diodes) can be used.

[0028] The voltage conversion module is connected to the contacts CN1-CN4 of the circuit breaker through the power conversion module, and the switching device is a MOS transistor Q1. The voltage comparison module includes an operational amplifier U1 and MCU, the two ends of the PTC element and the output terminal of the voltage reference module are connected to the input signal terminal of the MCU through the operat...

Embodiment 3

[0031] Such as image 3 As shown, a circuit breaker PTC thermal protection circuit of the present invention includes a voltage reference module, a voltage comparison module and a switching device for controlling magnetic flux action, CN1 and CN4 are respectively the L contact and N contact of the circuit breaker, and PTC1 and PTC4 are The thermal element is fixed on the contact of the circuit breaker.

[0032] The voltage comparison module is a comparator, the switching device is a MOS transistor Q2, the two ends of the PTC element and the output end of the voltage reference module are connected to the input end of the comparator, the output end of the comparator is connected to the gate of the MOS transistor Q2, and the gate of the MOS transistor Q2 The source is grounded, the drain is respectively connected to the cathode of the rectifier diode D2 and one end of the resistor R3, the anode of the rectifier diode D2 is connected to the N contact of the circuit breaker through ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a circuit breaker PTC thermal protection circuit, and the circuit is characterized in that the circuit comprises a voltage conversion module, a power supply conversion module, a voltage reference module, a voltage comparison module and a switching device for controlling magnetic flux action; the voltage conversion module is connected with a breaker contact through the power conversion module, two ends of the PTC element and an output end of the voltage reference module are connected with an input end of the voltage comparison module, an output end of the voltage comparison module is connected with a driving electrode of the switching device, one end of the switching device is grounded, and the other end of the switching device is connected with a VCC end through magnetic flux. The voltage comparison module compares the output voltage of the PTC element with the reference voltage: when the voltage value of the PTC element is greater than the reference voltage, the switching device is controlled to be switched on so as to control the magnetic flux action, thereby realizing tripping of the circuit breaker. Reliable protection is achieved by collecting voltage parameters of resistance changes at the two ends of the PTC and processing the voltage parameters through a circuit, installation and adjustment are convenient, and precision is high.

Description

technical field [0001] The invention relates to a PTC thermal protection circuit for a circuit breaker, which is mainly used for a miniature circuit breaker (MCB) or a molded case circuit breaker (MCCB) or a frame circuit breaker (ACB), and belongs to the field of low-voltage electrical appliances. Background technique [0002] The thermal protection of existing circuit breakers generally adopts the following two methods: the overload signal is collected by the transformer and protected by a comparator (operational amplifier, etc.), which is relatively expensive and inconvenient to install; or the thermal overload characteristic of the bimetal strip is used for protection. Using the double sequins to heat and warp to push the trip lever to trip the circuit breaker to reach the protection circuit, the double sequins are inconvenient to adjust, the protection accuracy is relatively low, and the production cost is high, which is not very economical. Contents of the invention ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22H02H5/04
CPCH02H7/22H02H5/04
Inventor 柴爱军
Owner 真兰电气(上海)有限公司