Arc detection circuit and power supply driving device

Abstract

The utility model discloses an arc detection circuit and a power supply driving device, comprising a switch driving module, a current sampling module, a control module, an operational amplification module, a blocking module and a comparison module, the switch driving module is used for being connected with a load to form a power supply branch, and the power supply branch is used for being connected with a power supply; the sampling end of the current sampling module is connected with a power supply branch to detect the working current of the power supply branch, the control module is connected with the controlled end of the switch driving module to control the on-off of the switch driving module, and the input end of the operational amplification module is connected with the output end of the current sampling module. The output end of the operational amplification module is respectively connected with the input ends of the control module and the blocking module, the first input end of the comparison module is connected with the output end of the blocking module, the second input end of the comparison module is connected with a reference signal source, and the output end of the comparison module is connected with the control module; according to the design, the safety triggering efficiency and reliability are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply equipment technical field especially relates to an arc detection circuit and power drive device. BACKGROUND

[0002] The power supply equipment supplies power for the load, but in the use process, when the power supply port and the load of the power supply equipment exist the gap, will cause the generation of the electric arc, and the electric arc can possibly ignite other articles, causes the occurrence of the fire.

[0003] Therefore, part manufacturers will set up the arc detection circuit in the power supply equipment, because the working current will suddenly increase and form the peak when the electric arc generates, the arc detection circuit can judge whether the electric arc generates through the detection of the working current, and the control module can control the power supply equipment power off according to the corresponding situation, but the existing arc detection circuit directly inputs the current sampling signal to the control module, and the mutation of the current sampling signal can possibly cause the feedback port of the control module to be damaged, when the feedback port of the control module is damaged, the power supply equipment can not be reliably controlled to be turned off. SUMMARY

[0004] The utility model discloses at least one of the technical problems in the prior art is solved, and for this purpose, the utility model provides an arc detection circuit and power drive device, and the efficiency and reliability of safe triggering are guaranteed.

[0005] The arc detection circuit according to the first aspect of the utility model, including: switch drive module, is used to be connected with load to form power supply branch, the power supply branch is used to be connected with power supply source, current sampling module, the sampling end of the current sampling module is connected with the power supply branch to detect the working current of the power supply branch, control module, the control module is connected with the controlled end of the switch drive module to be able to control the on-off of the switch drive module, operational amplifier module, the input end of the operational amplifier module is connected with the output end of the current sampling module, direct current isolation module, the output end of the operational amplifier module is connected with the control module and the input end of the direct current isolation module respectively, comparison module, the first input end of the comparison module is connected with the output end of the direct current isolation module, the second input end of the comparison module is connected with reference signal source, and the output end of the comparison module is connected with the control module.

[0006] The arc detection circuit according to the utility model embodiment has at least the following beneficial effects:

[0007] The utility model arc detection circuit, current sampling module samples the working current of power supply branch, and the current sampling signal is output to control module after signal amplification through operational amplifier module, and control module can judge whether arc appears according to current sampling signal, if arc appears, control module controls switch drive module to open to cut off power supply branch, and higher reaction efficiency guarantees the safety of load power consumption, and under repeated use, the direct current part of current sampling signal can cause interference to the receiving port of control module and cause signal inaccuracy or port failure, therefore, current sampling signal can also be separated through direct current module and then be compared through comparison module, when the current sampling signal is greater than the threshold value provided by reference signal source, control module obtains the level signal output at the output end of comparison module, and switch drive module can be controlled to open to cut off power supply branch, because of the separation low pass processing of direct current module, interference signal is not easy to enter control module from this way, and the effect of preventing mistake is achieved, and the efficiency and reliability of safe triggering are guaranteed.

[0008] According to some embodiments of the utility model, the current sampling module includes a front porch blanking unit, an input end of the front porch blanking unit is connected with the power supply branch, and an output end of the front porch blanking unit is connected with a first input end of the operational amplifier module.

[0009] According to some embodiments of the utility model, the front porch blanking unit includes a resistor R806, a resistor R807 and a capacitor C803, a first end of the resistor R806 is connected with a first end of the resistor R807 and an output end of the switch drive module respectively, a tail end of the resistor R806 is connected with a first end of the capacitor C803 and a first input end of the operational amplifier module respectively, and a tail end of the resistor R807 and a tail end of the capacitor C803 are grounded.

[0010] According to some embodiments of the utility model, the operational amplifier module includes an operational amplifier U803, a resistor R808, a resistor R809 and a capacitor C804, a first input end of the operational amplifier U803 is connected with an output end of the current sampling module, a first end of the resistor R808 is connected with a first end of the resistor R809, a first end of the capacitor C804 and a second input end of the operational amplifier U803 respectively, a tail end of the resistor R808 is grounded, a tail end of the resistor R809 is connected with a tail end of the capacitor C804, an output end of the operational amplifier U803, the control module and an input end of the direct current module respectively.

[0011] According to some embodiments of the utility model, the direct current isolation module includes capacitor C805, resistance R810 and diode D801, the first end of capacitor C805 is connected with the output end of operational amplifier module, the tail end of capacitor C805 is connected with the first end of resistance R810, the cathode of diode D801 and the first input end of comparison module respectively, the tail end of resistance R810 and the anode of diode D801 are grounded.

[0012] According to some embodiments of the utility model, the reference signal source includes reference voltage output source, and the reference voltage output source is connected with the second input end of comparison module to provide reference voltage.

[0013] According to some embodiments of the utility model, the switch drive module includes semiconductor switch Q801, resistance R804 and resistance R805, the first end of resistance R804 is connected with control module, the tail end of resistance R804 is connected with the controlled end of switch Q801 and the first end of resistance R805 respectively, the input end of switch Q801 is used to be connected with load, and the output end of switch Q801 and the tail end of resistance R805 are grounded.

[0014] The power supply driving device according to the second aspect of the utility model comprises a power supply modulation module and the arc detection circuit disclosed in any of the above embodiments, and the power supply modulation module supplies power to the power supply branch.

[0015] The power supply driving device according to the utility model has at least the following beneficial effects:

[0016] The power supply driving device of the utility model adopts the arc detection circuit disclosed in any of the above embodiments, and guarantees the efficiency and reliability of safe triggering.

[0017] Additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0019] Fig. 1 It is the principle block diagram of one kind of embodiment of arc detection circuit of the utility model;

[0020] Fig. 2 It is the circuit schematic diagram of control module of one kind of embodiment of arc detection circuit of the utility model;

[0021] Fig. 3The utility model discloses an arc detection circuit one of the embodiment's switch drive module, current sampling module, operational amplifier module, direct current module and comparison module's circuit schematic diagram.

[0022] Reference signs:

[0023] Switch drive module 100;Current sampling module 200;Control module 300;Operational amplifier module 400;Direct current module 500;Comparison module 600;Power supply modulation module 700. DETAILED DESCRIPTION

[0024] The embodiment of the utility model is described below in detail, the example of the embodiment is shown in the drawing, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar function throughout. The embodiment described below by referring to the drawings is exemplary, only for explaining the utility model, and can not be understood as limiting the utility model.

[0025] In the description of the utility model, it is understood that the orientation description, such as the terms“up”,“down”,“front”,“back”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“in”,“out” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it can not be understood as limiting the utility model.

[0026] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than and the like are not included in the number, above, below, within and the like are included in the number. If it is described to the first, the second is only used for distinguishing the technical features for the purpose, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0027] In the description of the utility model, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms“installation”,“connection”,“connection” should be understood broadly, for example, it can be fixedly connected, can be detachably connected, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0028] As Figs. 1 to 3As shown, according to the first aspect embodiment of the utility model discloses an arc detection circuit, including switch drive module 100, current sampling module 200, control module 300, operational amplifier module 400, direct current isolation module 500 and comparison module 600, switch drive module 100 is used to connect with load to form power supply branch, the power supply branch is used to connect with power supply, the sampling end of current sampling module 200 is connected with the power supply branch to detect the working current of the power supply branch, the controlled end of control module 300 is connected with switch drive module 100 to control the on-off of switch drive module 100, the input end of operational amplifier module 400 is connected with the output end of current sampling module 200, the output end of operational amplifier module 400 is connected with the input end of control module 300 and direct current isolation module 500 respectively, the first input end of comparison module 600 is connected with the output end of direct current isolation module 500, the second input end of comparison module 600 is connected with reference signal source, and the output end of comparison module 600 is connected with control module 300.

[0029] As shown in the figure, Fig. 2 The control module 300 can include a CPU or an MCU and its associated circuits, and the control module 300 can have multiple receiving ports, one of which is connected to the output end of the operational amplifier module 400, and the other is connected to the output end of the comparison module 600. The control module 300 also has a control port, and the control port of the control module 300 is connected to the controlled end of the switch drive module 100.

[0030] In some embodiments of the utility model, the switch drive module 100 includes a semiconductor switch tube Q801, a resistor R804 and a resistor R805. The first end of the resistor R804 is connected to the control module 300, the tail end of the resistor R804 is connected to the controlled end of the switch tube Q801 and the first end of the resistor R805 respectively, the input end of the switch tube Q801 is used to connect with the load, and the output end of the switch tube Q801 and the tail end of the resistor R805 are grounded.

[0031] After the control module 300 determines that an arc is generated, it can control the switch drive module 100 to be turned off, maintain the off state and calculate the off time. When the off time reaches a time threshold, the switch drive module 100 is controlled to be turned on again, which is recorded as the on-off of the switch drive module 100. The time threshold can be set to 30s, 60s or other time values. When the number of on-off of the switch drive module 100 reaches a number threshold, the control module 300 controls the switch drive module 100 to remain off and does not recover to be turned on. Specifically, the number threshold can be 4 times, 5 times, etc.

[0032] The utility model discloses arc detection circuit, current sampling module 200 is to the working current sampling of power supply branch, and the current sampling signal is exported to control module 300 after signal amplification through operational amplifier module 400, and control module 300 can judge whether appearing arc according to current sampling signal, if appearing arc, control module 300 controls switch drive module 100 to open to cut off power supply branch, and the higher reaction efficiency guarantees the safe use of load, and under repeated use, the direct current part of current sampling signal can cause the interference of the receiving port of control module 300 and cause signal inaccuracy or port failure, therefore, current sampling signal can also be separated direct current module 500 and is separated direct current low pass processing, then through comparison module 600 compares the current sampling signal of separated direct current low pass processing, when current sampling signal shows that the current is greater than the threshold value provided by reference signal source, control module 300 obtains the level signal output of the output end of comparison module 600, can control switch drive module 100 to open to cut off power supply branch, because of the separation direct current low pass processing of separated direct current module 500, and interference signal is not easy to enter control module 300 from this approach, plays the effect of preventing the fool, and the efficiency and reliability of safe triggering of the design guarantee.

[0033] In some embodiments of the utility model, as shown in Fig. 3 The current sampling module 200 includes a front porch blanking unit, an input end of the front porch blanking unit is connected with the power supply branch, and an output end of the front porch blanking unit is connected with a first input end of the operational amplifier module 400.

[0034] The front porch blanking unit is used for eliminating the pulse peak current generated in the instant of turning on the switch drive module 100, and preventing the control module 300 from being mistakenly triggered to turn off the switch drive module 100.

[0035] In some embodiments of the utility model, the front porch blanking unit includes a resistor R806, a resistor R807 and a capacitor C803, a first end of the resistor R806 is connected with a first end of the resistor R807 and an output end of the switch drive module 100 respectively, a tail end of the resistor R806 is connected with a first end of the capacitor C803 and the first input end of the operational amplifier module 400 respectively, and a tail end of the resistor R807 and a tail end of the capacitor C803 are grounded.

[0036] The resistor R806 and the resistor R807 are divided, and the capacitor C803 has a filtering effect, so that the instantaneous pulse peak current is eliminated, and the current is increased due to the arc generated in the arc drawing process, so that the control module 300 can be triggered to control the switch drive module 100 to be turned off.

[0037] In some embodiments of the utility model, the operational amplification module 400 includes operational amplifier U803, resistance R808, resistance R809 and capacitor C804, the first input end of operational amplifier U803 is connected with the output end of current sampling module 200, the first end of resistance R808 is connected with the first end of resistance R809, the first end of capacitor C804 and the second input end of operational amplifier U803 respectively, the tail end of resistance R808 is grounded, the tail end of resistance R809 is connected with the tail end of capacitor C804, the output end of operational amplifier U803, control module 300 and the input end of direct-current isolation module 500 respectively.

[0038] Operational amplification module 400 can be the same direction amplification circuit, adopts the mode of negative feedback to stabilize voltage gain, guarantees the stability of signal output to control module 300 and comparison module 600.

[0039] In some embodiments of the utility model, as shown in Fig. 3 Direct-current isolation module 500 includes capacitor C805, resistance R810 and diode D801, the first end of capacitor C805 is connected with the output end of operational amplification module 400, the tail end of capacitor C805 is connected with the first end of resistance R810, the cathode of diode D801 and the first input end of comparison module 600 respectively, the tail end of resistance R810 and the anode of diode D801 are grounded.

[0040] In some embodiments of the utility model, the reference signal source includes reference voltage output source, and the reference voltage output source is connected with the second input end of comparison module 600 to provide reference voltage.

[0041] It can be understood that the reference voltage output source can be given by control module 300, and can also be a constant voltage source connected to the outside world, and the user sets the constant voltage source to output stable voltage to give, and comparison module 600 can include comparator U805, the first input end of comparator U805 is connected with the output end of direct-current isolation module 500, the second input end of comparator U805 is connected with reference voltage output source, and the output end of comparator U805 is connected with control module 300.

[0042] According to the power supply driving device of the second aspect embodiment of the utility model, the power supply modulation module 700 is used for supplying power to the power supply branch.

[0043] The power supply modulation module 700 can be a conventional switching power supply module, the input end of the switching power supply module is connected with a power supply, and the output end of the switching power supply module is connected with a power supply branch after modulation to supply power for a load.

[0044] The power supply driving device adopts the arc detection circuit disclosed in any one of the above embodiments, and guarantees the efficiency and reliability of safe triggering.

[0045] The technical features of the above-described embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that they are within the scope of the present application.

[0046] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An arc detection circuit, characterized by, The application relates to a current sampling circuit, which comprises the following parts: a switch driving module, which is connected with a load to form a power supply branch for connecting with a power supply; a current sampling module, the sampling end of which is connected with the power supply branch to detect the working current of the power supply branch; a control module, which is connected with the controlled end of the switch driving module to control the on-off of the switch driving module; an operational amplifier module, the input end of which is connected with the output end of the current sampling module; a direct-current isolation module, the output end of the operational amplifier module being connected with the input end of the direct-current isolation module and the control module; a comparison module, the first input end of which is connected with the output end of the direct-current isolation module, the second input end of which is connected with a reference signal source, and the output end of which is connected with the control module.

2. An arc detection circuit according to claim 1, characterized in that: The current sampling module comprises a front edge blanking unit, the input end of which is connected with the power supply branch, and the output end of which is connected with the first input end of the operational amplifier module.

3. An arc detection circuit according to claim 2, characterised in that: The front edge blanking unit comprises a resistor R806, a resistor R807 and a capacitor C803, the first end of the resistor R806 being connected with the first end of the resistor R807 and the output end of the switch driving module, the tail end of the resistor R806 being connected with the first end of the capacitor C803 and the first input end of the operational amplifier module, and the tail end of the resistor R807 and the tail end of the capacitor C803 being grounded.

4. An arc detection circuit according to claim 1, characterized in that: The operational amplifier module comprises an operational amplifier U803, a resistor R808, a resistor R809 and a capacitor C804, the first input end of the operational amplifier U803 being connected with the output end of the current sampling module, the first end of the resistor R808 being connected with the first end of the resistor R809, the first end of the capacitor C804 and the second input end of the operational amplifier U803, the tail end of the resistor R808 being grounded, and the tail end of the resistor R809 being connected with the tail end of the capacitor C804, the output end of the operational amplifier U803, the control module and the input end of the direct-current isolation module.

5. An arc detection circuit according to claim 1, characterized in that: The direct-current isolation module comprises a capacitor C805, a resistor R810 and a diode D801, the first end of the capacitor C805 being connected with the output end of the operational amplifier module, the tail end of the capacitor C805 being connected with the first end of the resistor R810, the cathode of the diode D801 and the first input end of the comparison module, and the tail end of the resistor R810 and the anode of the diode D801 being grounded.

6. An arc detection circuit according to claim 1, characterized in that: The reference signal source comprises a reference voltage output source, which is connected with the second input end of the comparison module to provide a reference voltage.

7. An arc detection circuit according to claim 1, characterized in that: The switch driving module comprises a semiconductor switch Q801, a resistor R804 and a resistor R805, the resistor R804 is connected with the control module, the tail end of the resistor R804 is connected with the controlled end of the switch Q801 and the head end of the resistor R805 respectively, the input end of the switch Q801 is used for connecting with a load, and the output end of the switch Q801 and the tail end of the resistor R805 are grounded.

8. A power supply driving apparatus characterized by comprising: The arc detection circuit comprises a power supply modulation module and the arc detection circuit according to any one of claims 1 to 7, and the power supply modulation module supplies power for a power supply branch.

Images