阅读说明：本技术 一种智能断路器电源供电系统 (Intelligent circuit breaker power supply system ) 是由 郑长友 张佳 于 2021-08-24 设计创作，主要内容包括：本发明涉及一种智能断路器电源供电系统,所述智能断路器由对电路起保护作用的保护电路、除保护电路外的附加功能电路以及控制附加功能电路及保护电路的主控芯片组成,其特征在于,所述智能断路器电源供电系统包括电压供电系统以及电流供电系统；当所述智能断路器前端电压正常时,由电压供电系统供电；当所述智能断路器前端只有电流没有电压时,由电流供电系统供电,且电流供电系统仅为智能断路器中的保护电路及主控芯片供电。本发明解决了智能断路器在功能不断增加后所导致的现有电流互感器线圈无法满足要求的问题。同时,在电压供电系统无法正常工作时,可以利用电流供电系统为智能断路器的保护电路供电,确保断路器的正常运行。(The invention relates to a power supply system of an intelligent circuit breaker, wherein the intelligent circuit breaker comprises a protection circuit for protecting a circuit, an additional function circuit except the protection circuit and a main control chip for controlling the additional function circuit and the protection circuit; when the voltage at the front end of the intelligent circuit breaker is normal, the voltage is supplied by a voltage supply system; when the front end of the intelligent circuit breaker only has current and no voltage, the current power supply system supplies power, and the current power supply system only supplies power for the protection circuit and the main control chip in the intelligent circuit breaker. The invention solves the problem that the coil of the existing current transformer can not meet the requirement after the functions of the intelligent circuit breaker are continuously increased. Meanwhile, when the voltage power supply system cannot work normally, the current power supply system can be used for supplying power to the protection circuit of the intelligent circuit breaker, and the normal operation of the circuit breaker is ensured.)

1. A kind of intellectual circuit breaker power supply system, the said intellectual circuit breaker is by the protective circuit playing protective action to the circuit, additional function circuit and main control chip to control additional function circuit and protective circuit except protective circuit make up, characterized by that, the said intellectual circuit breaker power supply system includes voltage power supply system and current power supply system;

when the voltage at the front end of the intelligent circuit breaker is normal, the voltage is supplied by a voltage supply system;

when the front end of the intelligent circuit breaker only has current and no voltage, the current power supply system supplies power, the current power supply system only supplies power for a protection circuit and a main control chip in the intelligent circuit breaker, and the additional function circuit does not work; after the front end voltage of the intelligent circuit breaker is recovered to be normal, a voltage power supply system continues to supply power to the whole intelligent circuit breaker, and the output voltage of the voltage power supply system is higher than the output voltage of the current power supply system by more than 1V;

the voltage power supply system and the current power supply system supply power for the protection circuit and the main control chip of the intelligent circuit breaker through the DC-DC circuit II; converting the +13V low-voltage direct current output by the voltage power supply system or the +12V low-voltage direct current output by the current power supply system into +3.3V direct current voltage by a DC-DC circuit II to supply power for the main control chip of the intelligent circuit breaker and the protection circuit, wherein:

the second DC-DC circuit converts the +13V low-voltage direct current output by the voltage power supply system or the +12V low-voltage direct current output by the current power supply system into +3.3V direct current voltage by using a low-dropout linear regulator, the output end of the low-dropout linear regulator is connected with a diode D17 and a diode D18, the cathodes of the diode D17 and the diode D18 are connected with the input end of the low-dropout linear regulator, the anode of the diode D18 is connected with the output of the current power supply system, and the anode of the diode D17 is connected with the output of the voltage power supply system; when the voltage power supply system and the power supply system work normally at the same time, the diode D17 is conducted, the diode D18 is cut off, and only when the power supply system works, the diode D18 is conducted.

2. The power supply system of claim 1, wherein the voltage supply system comprises a half-wave rectifier circuit, a pi-type filter circuit and a first DC-DC circuit, wherein the half-wave rectifier circuit rectifies the ac power into the high-voltage DC power, the pi-type filter circuit filters the interference signals in the high-voltage DC power outputted from the half-wave rectifier circuit, and finally the first DC-DC circuit converts the filtered high-voltage DC power into +13V low-voltage DC power.

3. The intelligent circuit breaker power supply system of claim 2, wherein the current supply system converts current to +12V low voltage dc through a current transformer.

Technical Field

The invention relates to a circuit breaker power supply system.

Background

The intelligent circuit breaker is mainly applied to the field of low-voltage power distribution. As modern power systems are continuously developed towards intellectualization, more and more functions are integrated by circuit breakers. As the functional requirements of the circuit breaker continuously increase, the power consumption required by the circuit breaker is also continuously increased, which puts higher demands on the power supply system of the circuit breaker.

The existing circuit breaker power supply system mainly depends on the current induced by a current transformer to realize power supply, and along with the continuous increase of the functions of an intelligent circuit breaker, the power supply system is tested. If the traditional power supply mode is continuously adopted, the circuit breaker can reliably operate, and then higher requirements are placed on the parameters of the current transformer coil. If the transformer coil capable of meeting the requirements is assembled, the structural size is enlarged, the assembly is not facilitated, the cost price is high, and the competitive advantage is avoided.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the existing power supply system has high requirements on a transformer coil, high cost and large power consumption.

In order to solve the technical problems, the technical scheme of the invention is to provide an intelligent circuit breaker power supply system, wherein the intelligent circuit breaker comprises a protection circuit for protecting a circuit, an additional function circuit except the protection circuit and a main control chip for controlling the additional function circuit and the protection circuit;

when the voltage at the front end of the intelligent circuit breaker is normal, the voltage is supplied by a voltage supply system;

when the front end of the intelligent circuit breaker only has current and no voltage, the current power supply system supplies power, the current power supply system only supplies power for a protection circuit and a main control chip in the intelligent circuit breaker, and the additional function circuit does not work; after the front end voltage of the intelligent circuit breaker is recovered to be normal, a voltage power supply system continues to supply power to the whole intelligent circuit breaker, and the output voltage of the voltage power supply system is higher than the output voltage of the current power supply system by more than 1V;

the voltage power supply system and the current power supply system supply power for the protection circuit and the main control chip of the intelligent circuit breaker through the DC-DC circuit II; converting the +13V low-voltage direct current output by the voltage power supply system or the +12V low-voltage direct current output by the current power supply system into +3.3V direct current voltage by a DC-DC circuit II to supply power for the main control chip of the intelligent circuit breaker and the protection circuit, wherein:

the second DC-DC circuit converts the +13V low-voltage direct current output by the voltage power supply system or the +12V low-voltage direct current output by the current power supply system into +3.3V direct current voltage by using a low-dropout linear regulator, the output end of the low-dropout linear regulator is connected with a diode D17 and a diode D18, the cathodes of the diode D17 and the diode D18 are connected with the input end of the low-dropout linear regulator, the anode of the diode D18 is connected with the output of the current power supply system, and the anode of the diode D17 is connected with the output of the voltage power supply system; when the voltage power supply system and the power supply system work normally at the same time, the diode D17 is conducted, the diode D18 is cut off, and only when the power supply system works, the diode D18 is conducted.

Preferably, the voltage power supply system comprises a half-wave rectification circuit, a pi-type filter circuit and a first DC-DC circuit, wherein the half-wave rectification circuit rectifies alternating current into high-voltage direct current, the pi-type filter circuit filters interference signals in the high-voltage direct current output by the half-wave rectification circuit, and finally the first DC-DC circuit converts the filtered high-voltage direct current into +13V low-voltage direct current.

Preferably, the current power supply system converts the current into +12V low-voltage direct current through a current transformer.

The invention comprehensively utilizes the voltage power supply system and the current power supply system to supply power for the intelligent circuit breaker, and solves the problem that the coil of the existing current transformer cannot meet the requirement after the functions of the intelligent circuit breaker are continuously increased. Meanwhile, when the voltage power supply system cannot work normally, the current power supply system can be used for supplying power to the protection circuit of the intelligent circuit breaker, and the normal operation of the circuit breaker is ensured.

Drawings

FIG. 1 is an overall schematic of the present invention;

FIG. 2 is a schematic diagram of a voltage supply system;

FIG. 3 is a schematic diagram of a current powered system;

fig. 4 is a schematic diagram of a DC-DC circuit.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

As shown in fig. 1, the power supply system of the intelligent circuit breaker power supply provided by the invention comprises a voltage power supply system and a current power supply system.

When the voltage at the front end of the intelligent circuit breaker is normal, the whole system is powered by a voltage power supply system. When the front end of the intelligent circuit breaker only has current and no voltage, the whole system is powered by the current power supply system, when no voltage exists, the current power supply system only supplies power for a part of main protection circuits in the intelligent circuit breaker, and other additional functional circuits do not work, so that the current power supply system can provide electric energy which fully meets the requirement of normal operation of the protection circuits. When the voltage at the front end of the intelligent circuit breaker is recovered, the voltage supply system continues to supply power preferentially, and other additional functional circuits also recover to work normally.

As shown in fig. 2, in the present embodiment, the voltage supply system includes a power chip U2, and the power chip converts the commercial power into a dc power of about + 13V. In fig. 2, diodes D11, D12, D15, and D16 constitute a half-wave rectifier circuit for rectifying alternating current into direct current. And the inductor L3, the capacitor C13 and the capacitor C14 form a pi-type filter circuit for filtering interference signals in the direct current output by the half-wave rectifier circuit. The high-voltage direct current after being filtered by the filter plate is converted into direct current of about +13V through a DC-DC circuit formed by a power chip U2 and a circuit (comprising a resistor R9, a resistor R2, a capacitor C9, a capacitor C10, a diode D9, a resistor R5, a resistor R8, a capacitor C8, a diode D10, an inductor L4, a diode D14, a capacitor C11, a capacitor C12, a resistor R10 and a diode D13) around the power chip U2 to supply power to a corresponding circuit module.

As shown in fig. 3, the current supply system converts the current into a dc power supply of about +12V through the current transformer and the circuit shown in fig. 3. In fig. 3, B2, B3, and B4 are rectifier bridges, and cooperate with resistors R11, R12, R13, zener diode D20, inductor L5, MOS transistor Q1, diode D19, resistor R14, capacitor C19, capacitor C20, resistor R15, amplifier U4A, capacitor C21, resistors R16, and R17, to convert the current signal induced by the transformer into a dc voltage of about +12V, so as to supply power to the corresponding circuit module.

As shown in fig. 4, the schematic diagram of the DC-DC circuit is used to convert a +13V DC power supply provided by a voltage power supply system or a +12V DC power supply provided by a current power supply system into a +3.3V DC voltage to supply power to the main control chip and the protection circuit. The voltage output by the voltage power supply system and the current power supply system is used as input, and the input voltage is converted into a +3.3V direct-current power supply by using the low-dropout linear regulator U3 to supply power to the corresponding circuit module. Wherein, C15 and C16 are input filter capacitors, C17 and C18 are output filter capacitors, D18 and D17 are diodes, and DR1 is a zener diode.

The voltage supply system also supplies other circuit modules in the smart circuit breaker, for example: communication circuit module, metering circuit module, liquid crystal display circuit module, etc. In order to enable the voltage supply system to supply power to the main chip and the protection circuit in preference to the current supply system, the output voltage of the voltage supply system is made higher than the output voltage of the current supply system by more than 1V, and two diodes D17, D18 are added before the input of the DC-DC circuit. When the voltage power supply system and the power supply system work normally at the same time, because the output voltage of the voltage power supply system is 1V higher than that of the power supply system, the diode D17 is normally conducted at the moment, and the diode D18 cannot be normally conducted because the voltage of the negative electrode is higher than that of the positive electrode. When only the power supply system works, the diode D18 is conducted to supply power for the corresponding circuit at the back, thus ensuring the logic of the power supply circuit to be correct.