阅读说明：本技术 一种满足ia等级的高功率输出本安电源 (High-power output intrinsic safety power supply meeting ia level ) 是由 于庆 林引 刘亚辉 郭江涛 周代勇 邵严 任高建 张金豪 贺奎 赵光绪 胡亮 于 2021-09-22 设计创作，主要内容包括：本发明涉及一种满足ia等级的高功率输出本安电源,属于电气防爆领域,包括：非本安输入电源依次与开关电源拓扑电路、输出整流滤波电路、第一三级过压保护电路、限流电阻、电压过冲抑制电路、第二三级过压保护电路串联,输出本安电源；双电压反馈环路控制光耦与限流电阻并联,再串联至开关电源拓扑；限流电阻用于限制电路的最大输出电流值,第一三级过压保护电路和第二三级过压保护电路用于限制前后两点间的最大电压值,电压抑制过冲电路用于调整负载波动大而引起的输出误过压保护；双电压反馈环路控制光耦用于根据本安输出负载的电流值对直流电压的值进行反馈调整。(The invention relates to a high-power output intrinsic safety power supply meeting ia level, belonging to the field of electrical explosion prevention and comprising: the non-intrinsic safety input power supply is sequentially connected in series with the switching power supply topology circuit, the output rectification filter circuit, the first three-stage overvoltage protection circuit, the current-limiting resistor, the voltage overshoot suppression circuit and the second three-stage overvoltage protection circuit to output the intrinsic safety power supply; the dual-voltage feedback loop control optocoupler is connected with the current-limiting resistor in parallel and then connected to the switching power supply topology in series; the current-limiting resistor is used for limiting the maximum output current value of the circuit, the first three-level overvoltage protection circuit and the second three-level overvoltage protection circuit are used for limiting the maximum voltage value between the front point and the rear point, and the voltage suppression overshoot circuit is used for adjusting output error overvoltage protection caused by large load fluctuation; the dual-voltage feedback loop control optocoupler is used for carrying out feedback adjustment on the value of the direct-current voltage according to the current value of the intrinsic safety output load.)

1. A high power output intrinsic safety power supply meeting ia level is characterized in that: the circuit comprises a non-intrinsic safety input power supply, a switching power supply topology circuit, an output rectifying and filtering circuit, a current-limiting resistor, a first three-level overvoltage protection circuit, a second three-level overvoltage protection circuit, a voltage overshoot suppression circuit and a double-voltage feedback loop control optocoupler; the non-intrinsic safety input power supply is sequentially connected in series with a switching power supply topology circuit, an output rectification filter circuit, a first three-stage overvoltage protection circuit, a current-limiting resistor, a voltage overshoot suppression circuit and a second three-stage overvoltage protection circuit, and finally an intrinsic safety power supply is output; the dual-voltage feedback loop control optocoupler is connected with the current-limiting resistor in parallel and then connected to the switching power supply topology in series; the current-limiting resistor is used for limiting the maximum output current value of the circuit, the first three-level overvoltage protection circuit and the second three-level overvoltage protection circuit are used for limiting the maximum voltage value between the front point and the rear point, and the voltage suppression overshoot circuit is used for adjusting output error overvoltage protection caused by large load fluctuation; the dual-voltage feedback loop control optocoupler is used for carrying out feedback adjustment on the value of the direct-current voltage according to the current value of the intrinsic safety output load.

2. The ia-rated, high-power, intrinsically-safe power supply of claim 1, wherein: the power supply realizes high-power output of the intrinsic safety power supply by adopting a two-stage voltage cross feedback mode, and when the intrinsic safety output load current is smaller than the rated current of the circuit, the output voltage value is controlled by a V2 point through a double-voltage feedback loop to control the topology of the optical coupling control switch power supply so that the output voltage is stabilized at a set value of V2; when the intrinsic safety output current value is larger than the rated current value set by the circuit, the output voltage value is controlled by the optocoupler from a point V2 and a point V1 through the double-voltage feedback loop to control the switching power supply topology to output voltage, and the point V1 reaches the maximum output value, wherein the point V1 is one end of the current-limiting resistor close to the non-intrinsic safety input power supply, and the point V2 is one end of the current-limiting resistor close to the output of the circuit.

3. The ia-rated, high-power, intrinsically-safe power supply of claim 1, wherein: the double-voltage feedback loop control optocoupler comprises a four-end photoelectric coupler, an inductance coil with an iron core and a control circuit.

4. The ia-rated, high-power, intrinsically-safe power supply of claim 1, wherein: the current limiting resistor is a film resistor with the precision of more than 1% and is used for bearing the voltage of 1.5 times of the highest voltage and the power of 1.5 times of the maximum power which can appear in the circuit.

5. The ia-rated, high-power, intrinsically-safe power supply of claim 1, wherein: the three-level overvoltage protection circuit consists of three repeated overvoltage protection circuits, the overvoltage protection circuit consists of a voltage detection circuit, a driving circuit and a thyristor, the voltage detection circuit detects the voltage value between lines, and the driving circuit is used for driving the thyristor to be switched on and switched off; the working principle of the overvoltage protection circuit is that when the voltage value at the point V1 exceeds the set maximum value V1_maxWhen the driving circuit drives the thyristor to be conducted, when the voltage value at the point V2 exceeds the set maximum value V2_maxThe time driving circuit drives the thyristor to be conducted.

6. The ia-rated, high-power, intrinsically-safe power supply of claim 1, wherein: the maximum value of overvoltage protection of the three-stage overvoltage protection circuit is V1_maxAnd V2_maxWherein V1_maxValue of (d) and minimum value of current limiting resistance R_minJointly determining the output maximum current value of the output intrinsic safety power supplyV2_maxMethod for determining maximum output voltage value V of output intrinsic safety power supply_maxOutputting the rated current value of the intrinsic safety power supplyR is a current-limiting resistance value, and the maximum output power of the output intrinsic safety power supply isOutput maximum of output intrinsic safety power supply adopting linear protection modeEffective power ofThe method is realized by adjusting the resistance value of R under the same intrinsic safety parameter condition:

Technical Field

The invention belongs to the field of electrical explosion prevention, and relates to a high-power output intrinsic safety power supply meeting ia level.

Background

At present, the research and implementation method of the intrinsic safety output power supply is mostly based on the ib safety requirement, the research on the intrinsic safety output power supply meeting the ia safety level is relatively less, and the protection mode of the intrinsic safety output power supply meeting the ia safety level at present mainly adopts a linear characteristic output protection mode, so that the effective output power of the mode is lower, the mode is not suitable for supplying power to the substation and the switch of the intrinsic safety type, and the mode is not suitable for supplying power to the remote intrinsic safety type sensor.

Disclosure of Invention

In view of this, the present invention aims to improve the output power of the intrinsically safe power supply and improve the output stability of the power supply on the basis that the power supply meets the ia safety level by adopting a combination of two-stage voltage cross feedback, resistance current limiting, multi-stage overvoltage protection and output voltage overshoot suppression.

In order to achieve the purpose, the invention provides the following technical scheme:

a high-power output intrinsic safety power supply meeting ia level comprises an non-intrinsic safety input power supply, a switching power supply topology circuit, an output rectifying and filtering circuit, a current-limiting resistor, a first three-level overvoltage protection circuit, a second three-level overvoltage protection circuit, a voltage overshoot suppression circuit and a double-voltage feedback loop control optocoupler; the non-intrinsic safety input power supply is sequentially connected in series with a switching power supply topology circuit, an output rectification filter circuit, a first three-stage overvoltage protection circuit, a current-limiting resistor, a voltage overshoot suppression circuit and a second three-stage overvoltage protection circuit, and finally an intrinsic safety power supply is output; the dual-voltage feedback loop control optocoupler is connected with the current-limiting resistor in parallel and then connected to the switching power supply topology in series; the current-limiting resistor is used for limiting the maximum output current value of the circuit, the first three-level overvoltage protection circuit and the second three-level overvoltage protection circuit are used for limiting the maximum voltage value between the front point and the rear point, and the voltage suppression overshoot circuit is used for adjusting output error overvoltage protection caused by large load fluctuation; the dual-voltage feedback loop control optocoupler is used for carrying out feedback adjustment on the value of the direct-current voltage according to the current value of the intrinsic safety output load.

Further, the power supply realizes high-power output of the intrinsic safety power supply by adopting a two-stage voltage cross feedback mode, when the intrinsic safety output load current is smaller than the rated current of the circuit, the output voltage value is controlled by the V2 point through a double-voltage feedback loop to control the optical coupler to control the switching power supply topology, so that the output voltage is stabilized at the set value of V2; when the intrinsic safety output current value is larger than the rated current value set by the circuit, the output voltage value is controlled by the optocoupler from a point V2 and a point V1 through the double-voltage feedback loop to control the switching power supply topology to output voltage, and the point V1 reaches the maximum output value, wherein the point V1 is one end of the current-limiting resistor close to the non-intrinsic safety input power supply, and the point V2 is one end of the current-limiting resistor close to the output of the circuit.

Further, the double-voltage feedback loop control optocoupler comprises a four-end optocoupler, an inductance coil with an iron core and a control circuit.

Furthermore, the current limiting resistor is a film resistor with the precision of more than 1%, and is used for bearing the voltage which is 1.5 times of the highest voltage and the power which is 1.5 times of the maximum power which can appear in the circuit.

Furthermore, the three-level overvoltage protection circuit consists of three repeated overvoltage protection circuits, the overvoltage protection circuit consists of a voltage detection circuit, a driving circuit and a thyristor, the voltage detection circuit detects the voltage value between lines, and the driving circuit is used for driving the thyristor to be switched on and switched off; the working principle of the overvoltage protection circuit is that when the voltage value at the point V1 exceeds the set maximum value V1_maxWhen the driving circuit drives the thyristor to be conducted, when the voltage value at the point V2 exceeds the set maximum value V2_maxThe time driving circuit drives the thyristor to be conducted.

Further, the maximum value of overvoltage protection of the three-stage overvoltage protection circuit is V1_maxAnd V2_maxWherein V1_maxValue of (d) and minimum value of current limiting resistance R_minJointly determining the output maximum current value of the output intrinsic safety power supplyV2_maxFor determining an output bookMaximum output voltage value V of ampere power supply_maxOutputting the rated current value of the intrinsic safety power supplyR is a current-limiting resistance value, and the maximum output power of the output intrinsic safety power supply isThe maximum effective power output by the intrinsically safe power supply adopting the linear protection mode isThe method is realized by adjusting the resistance value of R under the same intrinsic safety parameter condition:

the invention has the beneficial effects that: the scheme satisfies the ia-level high-power output intrinsic safety power supply implementation method, greatly improves the output power and stability of the intrinsic safety power supply, and is suitable for supplying power to the intrinsic safety substation and the switch and also supplying power to the remote intrinsic safety sensor.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a block diagram of a high power output intrinsically safe power supply implementation meeting ia levels;

fig. 2 is a control circuit diagram of the dual-voltage feedback loop control optocoupler in this embodiment.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1, a high power output intrinsic safety power supply meeting ia level includes an non-intrinsic safety input power supply, a switching power supply topology circuit, an output rectification filter circuit, a current limiting resistor, a first three-level overvoltage protection circuit, a second three-level overvoltage protection circuit, a voltage overshoot suppression circuit, and a dual-voltage feedback loop control optocoupler; the non-intrinsic safety input power supply is sequentially connected in series with a switching power supply topology circuit, an output rectification filter circuit, a first three-stage overvoltage protection circuit, a current-limiting resistor, a voltage overshoot suppression circuit and a second three-stage overvoltage protection circuit, and finally an intrinsic safety power supply is output; the dual-voltage feedback loop control optocoupler is connected with the current-limiting resistor in parallel and then connected to the switching power supply topology in series; the current-limiting resistor is used for limiting the maximum output current value of the circuit, the first three-level overvoltage protection circuit and the second three-level overvoltage protection circuit are used for limiting the maximum voltage value between the front point and the rear point, and the voltage suppression overshoot circuit is used for adjusting output error overvoltage protection caused by large load fluctuation; the dual-voltage feedback loop control optocoupler is used for carrying out feedback adjustment on the value of the direct-current voltage according to the current value of the intrinsic safety output load.

In this embodiment, the power supply realizes high power output of the intrinsically safe power supply by adopting a two-stage voltage cross feedback mode, and when the current of the intrinsically safe output load is smaller than the rated current of the circuit, the output voltage value is stabilized at the set value of V2 by controlling the optical coupler control switching power supply topology through a double-voltage feedback loop from a V2 point; when the intrinsic safety output current value is larger than the rated current value set by the circuit, the output voltage value is controlled by the optocoupler from a point V2 and a point V1 through the double-voltage feedback loop to control the switching power supply topology to output voltage, and the point V1 reaches the maximum output value, wherein the point V1 is one end of the current-limiting resistor close to the non-intrinsic safety input power supply, and the point V2 is one end of the current-limiting resistor close to the output of the circuit. In the present embodiment, a circuit diagram of a dual voltage feedback loop control optocoupler is shown in fig. 2, and includes a four-terminal optocoupler U1 and an inductor coil with an iron core T1, and a control circuit.

In this embodiment, the current limiting resistor is a thin film resistor with 1% or higher precision, and the resistor can bear the voltage 1.5 times of the highest voltage and the power 1.5 times of the maximum power which can be generated in the circuit.

The three-level overvoltage protection circuit is composed of 3 repeated overvoltage protection circuits, the overvoltage protection circuit is composed of a voltage detection circuit, a driving circuit and a thyristor, the voltage detection circuit detects line-to-line voltage values, and the driving circuit is used for driving the thyristor to be switched on and switched off. The working principle of the overvoltage protection circuit is that when V1The voltage value of the point exceeds the set maximum value V1_maxWhen the driving circuit drives the thyristor to be conducted, when the voltage value at the point V2 exceeds the set maximum value V2_maxThe time driving circuit drives the thyristor to be conducted.

The maximum value of overvoltage protection of the three-stage overvoltage protection circuit is V1_maxAnd V2_maxWherein V1_maxValue of (d) and minimum value of current limiting resistance R_minJointly determining the output maximum current value of the output intrinsic safety power supplyV2_maxMethod for determining maximum output voltage value V of output intrinsic safety power supply_maxOutputting the rated current value of the intrinsic safety power supplyR is a current-limiting resistance value, and the maximum output power of the output intrinsic safety power supply isThe maximum effective power output by the intrinsically safe power supply adopting the linear protection mode isThe method is realized by adjusting the resistance value of R under the same intrinsic safety parameter condition:

finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.