CN211880081U - Intrinsic safety type power supply circuit and intrinsic safety type communication network equipment - Google Patents
Intrinsic safety type power supply circuit and intrinsic safety type communication network equipment Download PDFInfo
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- CN211880081U CN211880081U CN202020648225.9U CN202020648225U CN211880081U CN 211880081 U CN211880081 U CN 211880081U CN 202020648225 U CN202020648225 U CN 202020648225U CN 211880081 U CN211880081 U CN 211880081U
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Abstract
The utility model discloses an this ampere of type supply circuit and this ampere of type communication network equipment, this ampere of type supply circuit includes: an intrinsic safety type power supply processing circuit; the input ends of the multi-path DC-DC circuit are respectively connected with the output end of the intrinsic safety type power supply processing circuit; the detection end of the switch detection control circuit is connected with the multi-path DC-DC circuit, and the switch detection control circuit is used for being started when detecting that the voltage output by any one path of the multi-path DC-DC circuit is overvoltage so as to output a switch control signal; the controlled end of the overvoltage protection trigger circuit is connected with the output end of the switch detection control circuit; the overvoltage protection trigger circuit is used for disconnecting the voltage output of the intrinsic safety type power supply processing circuit and outputting a trigger signal when receiving the switch control signal; the intrinsic safety type power supply processing circuit is also used for stopping power supply output when receiving the trigger signal. The utility model discloses be favorable to improving this ampere of type supply circuit's stability and security.
Description
Technical Field
The utility model relates to a power technology field, in particular to this ampere of type supply circuit and this ampere of type communication network equipment.
Background
In special industries such as coal or mines, the requirement on safety performance in products is high, and the whole product cannot have ignition risk due to high temperature or sparks under any condition. When the DC-DC circuit is short-circuited to the ground or two or more DC-DC circuits having different output voltages are short-circuited to exceed the withstand voltage of the load, such as a chip or other devices, is easily damaged to generate high temperature and even spark, and the safety of the product is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an this ampere of type supply circuit and this ampere of type communication network equipment aims at the problem of solution.
In order to achieve the above object, the utility model provides an this ampere of type supply circuit, this ampere of type supply circuit includes:
an intrinsic safety type power supply processing circuit;
the input ends of the DC-DC circuits are respectively connected with the output end of the intrinsic safety type power supply processing circuit;
the detection end of the switch detection control circuit is connected with the plurality of paths of DC-DC circuits, and the switch detection control circuit is used for being started when detecting that the voltage output by any one path of the plurality of paths of DC-DC circuits is overvoltage so as to output a switch control signal;
the controlled end of the overvoltage protection trigger circuit is connected with the output end of the switch detection control circuit; the overvoltage protection trigger circuit is used for disconnecting the voltage output of the intrinsic safety type power supply processing circuit and outputting a trigger signal when the switch control signal is received;
the intrinsic safety type power supply processing circuit is also used for stopping power supply output when receiving the trigger signal.
Optionally, the switch detection control circuit includes multiple switch detection control branches, and each switch detection control branch is connected to an output terminal of one of the DC-DC circuits.
Optionally, each switch detection control branch comprises a voltage detection circuit and a switch tube, a detection end of the voltage detection circuit is connected with an output end of the corresponding DC-DC circuit, and an output end of the voltage detection circuit is connected with a controlled end of the switch tube; the output end of the switching tube is connected with the controlled end of the overvoltage protection trigger circuit;
the voltage detection circuit is used for detecting the voltage output by the DC-DC circuit and outputting a voltage detection signal;
and the switch tube is used for switching on/off according to the voltage detection signal and triggering the overvoltage protection trigger circuit to disconnect the voltage output of the intrinsic safety type power supply processing circuit when the switch tube is switched on.
Optionally, the voltage detection circuit includes a first resistor and a second resistor, a first end of the first resistor is a detection end of the voltage detection circuit, the first resistor is grounded via the second resistor, and a common end of the first resistor and the second resistor is an output end of the voltage detection circuit.
Optionally, the switch detection control branch further includes a pull-up resistor, a first end of the pull-up resistor is connected to the output end of the intrinsically safe power supply processing circuit, and a second end of the pull-up resistor is connected to the controlled end of the overvoltage protection trigger circuit.
Optionally, the overvoltage protection trigger circuit includes a switching circuit, a zener diode, and a thyristor, a controlled end of the switching circuit is a controlled end of the overvoltage protection trigger circuit, an input end of the switching circuit is interconnected with an output end of the intrinsically safe power processing circuit and an anode of the thyristor, and an output end of the switching circuit is connected with a cathode of the zener diode; the anode of the voltage stabilizing diode is grounded and is connected with the control electrode of the thyristor; the cathode of the thyristor is grounded.
Optionally, the overvoltage protection trigger circuit further includes a pull-down resistor and a current-limiting resistor, a first end of the current-limiting resistor is interconnected with the zener diode and a first end of the pull-down resistor, and a second end of the current-limiting resistor is connected with the control electrode of the thyristor; the second end of the pull-down resistor is grounded.
Optionally, the switching circuit includes any one or a combination of a triode, a MOS transistor, an optocoupler, and a relay.
Optionally, the intrinsically safe power supply circuit further includes a primary voltage protection circuit, a detection end and an input end of the primary voltage protection circuit are connected to an output end of the intrinsically safe power supply processing circuit, and an output end of the primary voltage protection circuit is grounded;
the primary voltage protection circuit is used for detecting the output voltage of the intrinsically safe power supply processing circuit, disconnecting the voltage output of the intrinsically safe power supply processing circuit when detecting the overvoltage of the output voltage of the intrinsically safe power supply processing circuit, and triggering the intrinsically safe power supply processing circuit to stop the power supply output.
The utility model also provides an intrinsic safety type communication network device, which comprises a switching chip and the intrinsic safety type power supply circuit;
the intrinsic safety type power supply circuit is connected with a power supply end of the exchange chip.
The utility model discloses this ampere of type supply circuit is through setting up this ampere of type power supply processing circuit, multichannel DC-DC circuit, switch detection control circuit and overvoltage protection trigger circuit, wherein switch detection control circuit 30 and multichannel DC-DC circuit connection, switch detection control circuit are detecting the multichannel DC-DC circuit opens when the voltage of output is excessive pressure wantonly all the way to output switch control signal, thereby control overvoltage protection trigger circuit work, with the disconnection this ampere of type power supply processing circuit's voltage output to output trigger signal, so that this ampere of type power supply processing circuit is receiving during trigger signal, stop power supply output realizes secondary voltage overvoltage protection. The utility model discloses can avoid chip or device to exceed its the biggest withstand voltage, perhaps voltage short circuit to ground or high-low voltage between short circuit and the problem emergence of overvoltage appears. The utility model discloses be favorable to improving this ampere of type supply circuit's stability and security.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of functional modules of an embodiment of the intrinsically safe power supply circuit of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of the intrinsically safe power supply circuit of the present invention;
FIG. 3 is a schematic circuit diagram of another embodiment of the intrinsically safe power supply circuit of the present invention;
fig. 4 is a schematic circuit diagram of another embodiment of the intrinsically safe power supply circuit of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The utility model provides an this ampere of type supply circuit.
Referring to fig. 1 to 4, in an embodiment of the present invention, the intrinsically safe power supply circuit includes:
an intrinsically safe power supply processing circuit 10;
the input ends of the multiple DC-DC circuits 20 are respectively connected with the output end of the intrinsic safety type power supply processing circuit 10;
a switch detection control circuit 30, a detection end of which is connected to the multiple paths of DC-DC circuits 20, wherein the switch detection control circuit 30 is configured to be turned on when detecting that a voltage output by any one of the multiple paths of DC-DC circuits 20 is over-voltage, so as to output a switch control signal;
an overvoltage protection trigger circuit 40, a controlled end of which is connected with an output end of the switch detection control circuit 30; the overvoltage protection trigger circuit 40 is configured to disconnect the voltage output of the intrinsically safe power supply processing circuit 10 and output a trigger signal when receiving the switch control signal;
the intrinsically safe power supply processing circuit 10 is further configured to stop power supply output when receiving the trigger signal.
In this embodiment, the intrinsically safe power processing circuit 10 may be a power supply controller or an intrinsically safe power supply (intrinsically safe. by limiting the energy in the electrical circuit and incorporating the structural design of the electrical device, it is not possible to generate or meet the conditions required to ignite the source in the circuit in both normal and accident situations). The intrinsic safety type power supply processing circuit 10 can be internally provided with an input protection safety circuit connected with an external power supply, an isolation transformer, a rectifier module, a battery switch and a battery management unit, wherein the input end of the input protection safety circuit is connected with an external power supply, the output end of the input protection safety circuit is connected with the isolation transformer, the output end of the isolation transformer is connected with the input end of the rectifier module, and the output end of the rectifier module is connected with an electric switch. In other embodiments, the intrinsically safe power supply may also include a battery module, a battery switch, a battery management unit, and other mobile power supplies capable of wirelessly supplying power.
The multiple DC-DC circuits 20 may be buck DC-DC circuits 20, and each of the multiple DC-DC circuits 20 may output the same supply voltage, for example, 5V. For example, each DC-DC circuit 20 may sequentially include a DC-DC circuit 20 outputting 3.3V, a DC-DC circuit 20 outputting 5V, a DC-DC circuit 20 outputting 1.1V, a DC-DC circuit 20 outputting 0.9V, and the like. The DC-DC circuit 20 may be implemented by a buck chip and its peripheral circuits. The DC-DC circuit 20 may be a single-stage DC-DC voltage step-down circuit, or may be a multi-stage DC-DC voltage step-down circuit, for example, in some loads requiring a smaller voltage, a voltage of 5V output by the single-stage DC-DC circuit 20 may be further reduced to 1.1V or 0.9V by setting the double-stage DC-DC circuit 20, so as to adapt to different load supply voltages.
It should be noted that in special industries such as coal or mine, the requirement for safety performance in the product is high, and the whole product cannot have ignition risk due to high temperature or spark under any condition. When the DC-DC circuit 20 is short-circuited to the ground, or when two or more DC-DC circuits 20 having different output voltages are short-circuited, for example, the DC-DC circuit 20 having an output of 1.1V is short-circuited with the output of the DC-DC circuit 20 having an output of 0.9V, so that the output of the DC-DC circuit 20 having an output of 0.9V is 1.1V and exceeds the withstand voltage of the load thereof, the load, such as a chip or other devices, is easily damaged to generate high temperature and even spark. At present, the intrinsically safe power supply circuit is usually provided with a primary voltage protection circuit 50 at the output end of the power supply processing circuit, and when the voltage abnormality of the output end of the power supply processing circuit is detected, the output end of the power supply processing circuit is conducted to the ground. The power supply processing circuit, such as a power supply controller or an intrinsic safety power supply, closes the output after detecting the voltage abnormality (the current becomes larger than a preset current limiting value) of the circuit, thereby realizing overvoltage protection. However, the primary voltage protection circuit 50 can only perform primary voltage overvoltage protection, that is, overvoltage protection on the voltage at the input terminal of the DC-DC circuit 20, but cannot perform protection when the secondary voltage is overvoltage.
In order to solve the above problem, the detection terminal of the switch detection control circuit 30 of the present embodiment may be disposed at any one of the multiple DC-DC circuits 20, for example, to output a small voltage (0.9V), or may be disposed at each detection DC-DC circuit 20 to detect the voltage output of each circuit of the multiple DC-DC circuits 20. In addition, the switch detection control circuit 30 is further provided with a preset voltage protection threshold, and the preset voltage protection threshold can be adjusted and set according to the magnitude of the output voltage of the DC-DC circuit 20. For example, when the switch detection control circuit 30 detects a voltage across the DC-DC circuit 20 outputting a voltage of 0.9V, the preset voltage protection threshold may be set to any value of 0.7 to 0.8V. The switch detection control circuit 30 is turned on when detecting that the voltage on any one of the multiple DC-DC circuits 20 exceeds its preset voltage protection threshold, and is turned off when detecting that the voltage on any one of the multiple DC-DC circuits 20 exceeds its preset voltage protection threshold. The overvoltage protection trigger circuit 40 is controlled by the switch detection control circuit 30, and the input end of the overvoltage protection trigger circuit 40 is arranged at the output end of the intrinsically safe power supply processing circuit 10, and the output end of the overvoltage protection trigger circuit 40 is grounded. When receiving the switch control signal of the switch detection control circuit 30, the overvoltage protection trigger circuit 40 works and conducts the output end of the power supply processing circuit to the ground, so that the power supply processing circuit closes the output after detecting that the voltage of the circuit is abnormal (the current becomes larger than a preset current limiting value), thereby realizing overvoltage protection. When the switch detection control circuit 30 is turned off, the overvoltage protection trigger circuit 40 does not operate. Therefore, according to whether the switch control circuit is conducted or not, whether the voltage at the output end of the DC-DC circuit 20 is overvoltage or not can be determined, and further whether the trigger overvoltage protection trigger circuit 40 works or not is determined, so that overvoltage protection of the secondary voltage is realized. Of course, in other embodiments, the switch detection control circuit 30 may also control the operation of the overvoltage protection trigger circuit 40 when being turned off, and control the operation of the overvoltage protection trigger circuit 40 when being turned on, which is not limited herein.
It is understood that the intrinsically safe power processing circuit 10 is also provided with a controller, such as a power controller, which may be a TOPjx series chip, UC3844, or the like, in which a voltage limiting function may be provided. When the secondary voltage has an overvoltage condition, the switch detection control circuit 30 outputs an overvoltage trigger signal to the intrinsically safe power supply processing circuit 10, so that the trigger power supply controller stops outputting the PWM signal, and the intrinsically safe power supply processing circuit 10 stops outputting the power supply.
The utility model discloses this ampere of type supply circuit is through setting up this ampere of type power supply treatment circuit 10, multichannel DC-DC circuit 20, switch detection control circuit 30 and overvoltage protection trigger circuit 40, wherein switch detection control circuit 30 and multichannel DC-DC circuit 20 connects, and switch detection control circuit 30 is detecting the multichannel DC-DC circuit 20 opens when the voltage of output is excessive pressure all the way wantonly to output switch control signal, thereby control overvoltage protection trigger circuit 40 work, with the disconnection this ampere of type power supply treatment circuit 10's voltage output to output trigger signal, so that this ampere of type power supply treatment circuit 10 is receiving during trigger signal, stop power supply output realizes secondary voltage overvoltage protection. The utility model discloses can avoid chip or device to exceed its the biggest withstand voltage, perhaps voltage short circuit to ground or high-low voltage between short circuit and the problem emergence of overvoltage appears. The stability and the safety of the intrinsic safety type power supply circuit are improved.
Referring to fig. 1 to 4, in an embodiment, the switch detection control circuit 30 includes multiple switch detection control branches (not shown), and each switch detection control branch is connected to an output terminal of one of the DC-DC circuits 20.
In this embodiment, the number of the switch detection control branches corresponds to the number of the DC-DC circuits 20, each switch detection control branch is configured to detect an output voltage of one DC-DC circuit 20, and when it is detected that the voltage of the DC-DC circuit 20 exceeds a preset voltage protection threshold of the DC-DC circuit 20, the switch detection control branch is turned on and outputs a switch control signal to control the operation of the overvoltage protection trigger circuit 40. When the voltage of the DC-DC circuit 20 is detected to be within the preset voltage protection threshold range of the DC-DC circuit 20, the overvoltage protection trigger circuit 40 is turned off.
Referring to fig. 1 to 4, in an embodiment, each of the switch detection control branches includes a voltage detection circuit 31 and a switch Q1, a detection terminal of the voltage detection circuit 31 is connected to an output terminal of the corresponding DC-DC circuit 20, and an output terminal of the voltage detection circuit 31 is connected to a controlled terminal of the switch Q1; the output end of the switching tube Q1 is connected with the controlled end of the overvoltage protection trigger circuit 40;
the voltage detection circuit 31 is configured to detect a voltage output by the DC-DC circuit 20 and output a voltage detection signal;
and the switching tube Q1 is configured to trigger the overvoltage protection trigger circuit 40 to disconnect the voltage output of the intrinsically safe power processing circuit 10 when the voltage output by the DC-DC circuit 20 is determined to be overvoltage according to the voltage value corresponding to the voltage detection signal and a preset voltage threshold.
In this embodiment, the voltage detection circuit 31 may be implemented by a voltage division detection circuit composed of a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is the detection end of the voltage detection circuit 31, the first resistor R1 is grounded via the second resistor R2, and the common end of the first resistor R1 and the second resistor R2 is the output end of the voltage detection circuit 31. The first resistor R1 and the second resistor R2 are used for series voltage division to realize voltage detection, and according to the voltage division principle, the larger the ratio of the first resistor R1 to the second resistor R2 is, the larger the voltage divided by the first resistor R1 is. In this way, the magnitude of the detection signal output to the switching tube Q1 can be adjusted by adjusting the resistance of the first resistor R1 and/or the second resistor R2 to adjust the sensitivity of the switching tube Q1 to voltage detection.
In an embodiment, the switch detection control branch further includes a pull-up resistor R3, a first end of the pull-up resistor R3 is connected to the output terminal of the intrinsically safe power supply processing circuit 10, and a second end of the pull-up resistor R3 is connected to the controlled terminal of the overvoltage protection trigger circuit 40.
The switching tube Q1 may be implemented by a switching tube Q1 such as a triode, a MOS transistor, an IGBT, etc., and this embodiment may be an NPN triode, where the first resistor R1 and the high-precision resistors R1 and R2 of the second resistor R2 divide the voltage to make VAE (VA) (R1/(R1+ R2)) slightly lower than threshold voltages of the base and the emitter of the NPN triode, and when the output voltage (secondary voltage) of the output terminal of the DC-DC circuit 20 normally works, the triode is not turned on, and at this time, the switching control signal output by the switching detection control circuit 30 is pulled up by the pull-up resistor R3 to be at a high level. When the triode works abnormally, V _ AE is increased, and the triode is conducted when the V _ AE is higher than the threshold voltage of the base electrode and the emitting electrode of the triode. At this time, the switch control signal output from the switch detection control circuit 30 is at a low level. When receiving the switch control signal of the low level, the overvoltage protection trigger circuit 40 disconnects the voltage output of the intrinsically safe power supply processing circuit 10, and outputs a trigger signal to trigger the intrinsically safe power supply processing circuit 10 to stop the power supply output.
Referring to fig. 1 to 4, in another embodiment, the switch detection control branch further includes a pull-down resistor R4, a first end of the pull-down resistor R4 is connected to ground, and a second end of the pull-down resistor R4 is connected to the controlled end of the overvoltage protection trigger circuit 40.
When the output terminal voltage (secondary voltage) of the DC-DC circuit 20 operates normally, the transistor does not conduct, and the switch control signal output by the switch detection control circuit 30 is pulled down to a low level by the pull-down resistor R4. When the output terminal of the DC-DC circuit 20 is abnormal, the voltage (secondary voltage) at the output terminal of the DC-DC circuit 20 increases, and V _ AE increases, and when the voltage is higher than the threshold voltages of the base and emitter of the transistor, the transistor is turned on. At this time, the switch control signal output from the switch detection control circuit 30 is at a high level. When receiving the high-level switch control signal, the overvoltage protection trigger circuit 40 disconnects the voltage output of the intrinsically safe power supply processing circuit 10, and outputs a trigger signal to trigger the intrinsically safe power supply processing circuit 10 to stop the power supply output.
Referring to fig. 1 to 4, in an embodiment, the overvoltage protection trigger circuit 40 includes a switch circuit 41, a zener diode ZD1 and a thyristor ZD2, a controlled terminal of the switch circuit 41 is a controlled terminal of the overvoltage protection trigger circuit 40, an input terminal of the switch circuit 41 is interconnected with an output terminal of the intrinsically safe power supply processing circuit 10 and an anode of the thyristor ZD2, and an output terminal of the switch circuit 41 is connected with a cathode of the zener diode ZD 1; the anode of the zener diode ZD1 is grounded and is connected with the control electrode of the thyristor ZD 2; the cathode of the thyristor ZD2 is connected to ground.
Further, the overvoltage protection trigger circuit 40 further includes a pull-down resistor R5 and a current-limiting resistor R6, a first end of the current-limiting resistor R6 is interconnected with first ends of the zener diode ZD1 and the pull-down resistor R5, and a second end of the current-limiting resistor R6 is connected with a control electrode of the thyristor ZD 2; the second terminal of the pull-down resistor R5 is connected to ground.
In this embodiment, the switch circuit 41 may be implemented by any one or a combination of a triode, a MOS transistor, an optocoupler, and a relay. The overvoltage protection trigger circuit 32 further comprises a capacitor C1, and the capacitor C1 is used as a filter capacitor of the control stage of the thyristor ZD2, so that the influence of external interference on the control stage of the thyristor ZD2 is reduced.
It should be noted that, the power supply voltage of a chip such as a switch chip is usually small, and when the thyristor ZD2 and a regulator tube are used to implement overvoltage protection, when a certain voltage is lower than the rated voltage of the regulator tube or lower than the starting voltage of the control stage of the thyristor ZD2, the circuit is disabled. The current multi-path voltage required by a plurality of chips is lower than the reverse breakdown voltage of a voltage stabilizing diode ZD1 or the control level starting voltage of a thyristor ZD2 (the minimum starting voltage of the control level of the thyristor ZD2 on the current market is 3V), so that the voltage stabilizing tube and the thyristor ZD2 are not suitable for directly protecting the secondary voltage. For this reason, the utility model discloses a with the switch detection control branch road setting in the secondary voltage side, overvoltage protection trigger circuit 40 sets up in the primary voltage side, when the switch detection control branch road detects the secondary voltage excessive pressure, triggers overvoltage protection trigger circuit 40 and carries out the turn-off protection to primary voltage. Meanwhile, the intrinsically safe power supply processing circuit 10 turns off the output after detecting that the voltage of the circuit is abnormal (the current becomes larger than a preset current limiting value), thereby realizing protection.
In this embodiment, two outputs of the DC-DC circuit 20 are taken as an example to explain the working principle of the switch detection control branch and the overvoltage protection trigger circuit 40, and the outputs of the two outputs of the DC-DC circuit 20 are respectively labeled as V _ a and V _ B. Specifically, the voltage detection circuit 31 detects the output terminal V _ a or V _ B of the two-way DC-DC circuit 20, and outputs a voltage detection signal to the controlled terminal of the switching tube Q1. Whether the normal state or the abnormal state is determined according to whether the conduction threshold of the switching tube Q1 is reached. In a normal state, the voltages output by the output terminals V _ a or V _ B of the two DC-DC circuits 20 are both smaller than the corresponding reference voltages. The switch Q1 keeps non-conducting state, the zener diode ZD1 is not broken down reversely, the control stage of the thyristor ZD2 is connected to ground through the current limiting resistor R6 and the pull-down resistor R5, and the thyristor ZD2 is in off state.
In an abnormal state, V _ a or V _ B in the output terminals of the two DC-DC circuits 20 is shorted to ground, and when the DC-DC circuits 20 are shorted between V _ a and V _ B, the voltage value of the voltage with the lower voltage (assumed to be V _ a) is inevitably increased, and when the voltage detection signal received by the switching tube Q1 is greater than the conduction threshold value, the switching tube Q1 is turned on, and the output of the switching detection control circuit 30 is changed (for example, signal inversion is performed, high level is output in a normal state, and low level is output in an abnormal state, otherwise, the switching circuit 41 is in a conduction state, and the primary voltage is applied to the control electrode of the thyristor ZD2 through the voltage regulator tube and the pull-down resistor R5, and the thyristor 2 is turned on, so that the primary voltage is output to ground, and overvoltage. In addition, because the voltage and the current of the path of voltage are increased instantly, the intrinsic safety power supply processing circuit carries out overcurrent protection on the voltage of the path of voltage and turns off the output.
Referring to fig. 1 to 4, in an embodiment, the intrinsically safe power supply circuit further includes a primary voltage protection circuit 50, a detection terminal and an input terminal of the primary voltage protection circuit 50 are connected to an output terminal of the intrinsically safe power processing circuit 10, and an output terminal of the primary voltage protection circuit 50 is grounded;
the primary voltage protection circuit 50 is configured to detect an output voltage of the intrinsically safe power processing circuit 10, and when detecting that the output voltage of the intrinsically safe power processing circuit 10 is overvoltage, disconnect the voltage output of the intrinsically safe power processing circuit 10, and trigger the intrinsically safe power processing circuit 10 to stop the power output.
In this embodiment, the primary voltage protection circuit 50 can be implemented by using the over-voltage protection trigger circuit 32. Namely, the primary voltage protection circuit 50 is formed by the components of the zener diode ZD3, the thyristor ZD4, the pull-down resistor R7, the current-limiting resistor R8, and the like. Specifically, the cathode of the zener diode ZD3 is connected to the output terminal (positive terminal of the primary voltage) of the intrinsically safe power supply processing circuit, and the anode of the zener diode ZD3 is connected to the ground through the pull-down resistor R7 (kiloohm level); the anode A of the thyristor ZD2 is connected with the anode of the primary voltage, the cathode K is grounded, and the control electrode G is connected with the anode of the voltage-stabilizing diode ZD3 through a current-limiting resistor R8. The primary voltage protection circuit 50 further comprises a capacitor C2, and the capacitor C2 is used as a filter capacitor of the control stage of the thyristor ZD4, so that the influence of external interference on the control stage of the thyristor ZD4 is reduced. When the thyristor ZD4 normally works, the voltage resistance of the Zener diode ZD3 is slightly higher than the normal voltage, the Zener diode ZD3 does not work, the pole of the thyristor ZD4 is connected to the ground through the current-limiting resistor R8 and the pull-down resistor R7, and the thyristor ZD4 is not conducted. When the voltage of the output end of the intrinsic safety power supply processing circuit is abnormal and exceeds the voltage withstanding value of the Zener diode ZD3, the Zener diode ZD3 is conducted. The power voltage at the output end of the intrinsically safe power supply processing circuit 10 drives the control electrode G of the thyristor ZD4 through the Zener diode ZD3 and the pull-down resistor R7, the thyristor ZD4 is turned on, and the voltage is conducted to the ground through the thyristor ZD 4. The intrinsically safe power supply processing circuit 10 turns off the output after detecting that the voltage of the circuit is abnormal (the current becomes larger than a preset current limiting value), thereby realizing protection.
The utility model also provides an intrinsic safety type communication network device, which comprises a switching chip 100 and the intrinsic safety type power supply circuit;
the intrinsic safety type power supply circuit is connected to a power supply terminal of the switch chip 100.
The detailed structure of the intrinsically safe power supply circuit can refer to the above embodiments, and is not described herein again; it can be understood that, because the utility model discloses above-mentioned ann's type supply circuit has been used in the ann's type communication network equipment, consequently, the utility model discloses this ann's type communication network equipment's embodiment includes all technical scheme of the whole embodiments of above-mentioned ann's type supply circuit, and the technical effect who reaches is also identical, no longer gives unnecessary details here.
In this embodiment, the intrinsically safe communication network device may be a switch, and may be particularly applied to communication network devices in special industries with high safety requirements, such as coal or mines.
With the rapid development of chip technology and manufacturing process, the integration level of the switching chip 100 is higher and higher, and the chip function is stronger and stronger; accompanying this is a dramatic increase in the chip supply voltage from one or two to three or more, with the chip supply voltage becoming lower (e.g., 0.9V) and the voltage-to-voltage difference becoming smaller (some chips use both 0.9V and 1.1V). In this embodiment, the switch chip 100 has a plurality of power supply terminals, and the plurality of power supply terminals are respectively connected to corresponding DC-DC circuits in the intrinsically safe power supply circuit.
The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.
Claims (10)
1. An intrinsically safe power supply circuit, comprising:
an intrinsic safety type power supply processing circuit;
the input ends of the DC-DC circuits are respectively connected with the output end of the intrinsic safety type power supply processing circuit;
the detection end of the switch detection control circuit is connected with the plurality of paths of DC-DC circuits, and the switch detection control circuit is used for being started when detecting that the voltage output by any one path of the plurality of paths of DC-DC circuits is overvoltage so as to output a switch control signal;
the controlled end of the overvoltage protection trigger circuit is connected with the output end of the switch detection control circuit; the overvoltage protection trigger circuit is used for disconnecting the voltage output of the intrinsic safety type power supply processing circuit and outputting a trigger signal when the switch control signal is received;
the intrinsic safety type power supply processing circuit is also used for stopping power supply output when receiving the trigger signal.
2. The intrinsically safe power supply circuit of claim 1, wherein the switch sense control circuit comprises a plurality of switch sense control branches, each of the switch sense control branches being connected to an output of one of the DC-DC circuits.
3. The intrinsically safe power supply circuit of claim 2, wherein each switch detection control branch comprises a voltage detection circuit and a switch tube, a detection end of the voltage detection circuit is connected with an output end of the corresponding DC-DC circuit, and an output end of the voltage detection circuit is connected with a controlled end of the switch tube; the output end of the switching tube is connected with the controlled end of the overvoltage protection trigger circuit;
the voltage detection circuit is used for detecting the voltage output by the DC-DC circuit and outputting a voltage detection signal;
and the switch tube is used for switching on/off according to the voltage detection signal and triggering the overvoltage protection trigger circuit to disconnect the voltage output of the intrinsic safety type power supply processing circuit when the switch tube is switched on.
4. The intrinsically safe power supply circuit of claim 3, wherein the voltage detection circuit comprises a first resistor and a second resistor, a first terminal of the first resistor is a detection terminal of the voltage detection circuit, the first resistor is grounded via the second resistor, and a common terminal of the first resistor and the second resistor is an output terminal of the voltage detection circuit.
5. The intrinsically safe power supply circuit of claim 3, wherein the switch detection control branch further comprises a pull-up resistor, a first end of the pull-up resistor is connected with the output end of the intrinsically safe power supply processing circuit, and a second end of the pull-up resistor is connected with the controlled end of the overvoltage protection trigger circuit.
6. The intrinsically safe power supply circuit of claim 1, wherein the over-voltage protection trigger circuit comprises a switching circuit, a zener diode, and a thyristor, wherein the controlled terminal of the switching circuit is the controlled terminal of the over-voltage protection trigger circuit, wherein the input terminal of the switching circuit is interconnected with the output terminal of the intrinsically safe power processing circuit and the anode of the thyristor, and the output terminal of the switching circuit is connected with the cathode of the zener diode; the anode of the voltage stabilizing diode is grounded and is connected with the control electrode of the thyristor; the cathode of the thyristor is grounded.
7. The intrinsically safe power supply circuit of claim 6, wherein the over-voltage protection trigger circuit further comprises a pull-down resistor and a current-limiting resistor, wherein a first end of the current-limiting resistor is interconnected with the zener diode and a first end of the pull-down resistor, and a second end of the current-limiting resistor is connected with the control electrode of the thyristor; the second end of the pull-down resistor is grounded.
8. An intrinsically safe supply circuit as claimed in claim 6, wherein the switching circuit comprises any one or more of a triode, a MOS transistor, an optocoupler and a relay.
9. The intrinsically safe power supply circuit of any one of claims 1 to 8, further comprising a primary voltage protection circuit, wherein the detection terminal and the input terminal of the primary voltage protection circuit are connected to the output terminal of the intrinsically safe power processing circuit, and the output terminal of the primary voltage protection circuit is grounded;
the primary voltage protection circuit is used for detecting the output voltage of the intrinsically safe power supply processing circuit, disconnecting the voltage output of the intrinsically safe power supply processing circuit when detecting the overvoltage of the output voltage of the intrinsically safe power supply processing circuit, and triggering the intrinsically safe power supply processing circuit to stop the power supply output.
10. An intrinsically safe communication network device comprising a switching chip and an intrinsically safe power supply circuit as claimed in any one of claims 1 to 9;
the intrinsic safety type power supply circuit is connected with a power supply end of the exchange chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020648225.9U CN211880081U (en) | 2020-04-24 | 2020-04-24 | Intrinsic safety type power supply circuit and intrinsic safety type communication network equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020648225.9U CN211880081U (en) | 2020-04-24 | 2020-04-24 | Intrinsic safety type power supply circuit and intrinsic safety type communication network equipment |
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| CN211880081U true CN211880081U (en) | 2020-11-06 |
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