CN205643483U - Voltage detection circuit and system - Google Patents

Abstract

The embodiment of the utility model provides a voltage detection circuit and system. The invention relates to the field of electronic technology, and can avoid the interference of interference signals on detection results when detecting high-voltage AC voltages. It includes a voltage input module, a trigger module, a comparison module, a reference module, and a detection signal output terminal; the trigger module is respectively connected to the voltage input module and the comparison module, and the comparison module is respectively connected to the reference module and the detection signal output terminal; the trigger module is configured to receive Voltage signal, when the voltage signal is greater than the first voltage threshold and less than the second voltage threshold, output a trigger signal to the comparison module; the reference module is configured to output a reference signal to the comparison module; the comparison module is configured to when the trigger signal is greater than the reference signal , the comparison module outputs the first detection signal to the detection signal output terminal, and when the trigger signal is smaller than the reference signal, the comparison module outputs the second detection signal to the detection signal output terminal. The utility model is used for detecting voltage.

Description

A voltage detection circuit and system

technical field

The utility model relates to the field of electronic technology, in particular to a voltage detection circuit and system.

Background technique

As an important energy supply method for energy systems in modern industry, alternating current is widely used in technical fields such as electric power, electronics, and machinery. Since in most cases, the voltage of AC power can be used as an indication of the operating status of the device, and it can also be used as feedback information after the device performs certain actions. Therefore, a device or system powered by AC power needs to monitor the status of the AC voltage input terminal. Test to judge whether the system power supply is working normally.

With the development of science and technology, modern industry has higher and higher requirements for the automation and intelligence of equipment, and the demand for condition monitoring of alternating current through equipment or systems using alternating current is becoming more and more urgent. However, since my country usually adopts rated 220V, 50Hz AC as the mains standard, most equipment or systems that use AC use 220V, 50Hz AC signals to feed back status information. At the same time, according to the "GB/T 12325-2008 Power Quality Supply Voltage Deviation" standard, the 220V single-phase power supply voltage deviation is -10% to +7% of the standard voltage, that is, 198V to 235.4V. , It is necessary to detect AC voltage signals with a voltage range of 198V to 235.4V. Since the voltage of the AC voltage signal to be detected is relatively high, the sensors in the prior art cannot directly detect the AC voltage signal.

Usually, a transformer is generally used to step down the high-voltage AC voltage signal, and convert the high-voltage AC voltage signal into a DC signal that can be recognized by the microcontroller, and then perform corresponding detection. However, in the above detection scheme, the AC voltage signal after step-down is prone to more interference, such as glitches, oscillations, etc., thereby affecting the detection results. If the AC voltage signal is rectified, stabilized and filtered, because the equipment and components required in the corresponding process are relatively complex, the detection cost of the high-voltage AC voltage signal in the prior art is relatively high. Too many devices and components are involved, which increases the probability of failure during the detection process, thereby increasing the implementation cost and difficulty of the scheme, and reducing the detection efficiency and reliability of the scheme.

Utility model content

The utility model provides a voltage detection circuit and system, which can avoid the interference of interference signals on detection results when detecting AC voltages with a relatively high voltage range.

In the first aspect, the embodiment of the utility model provides a voltage detection circuit, including: a voltage input module, a trigger module, a comparison module, a reference module, and a detection signal output terminal; the trigger module is respectively connected to the voltage input module and the comparison module, and the comparison module The modules are respectively connected to the reference module and the detection signal output terminal; the trigger module is configured to receive the voltage signal from the voltage input module, and when the voltage signal is greater than the first voltage threshold and less than the second voltage threshold, output the trigger signal to the comparison module; reference The module is configured to output a reference signal to the comparison module; the comparison module is configured to compare the trigger signal and the reference signal. When the trigger signal is greater than the reference signal, the comparison module outputs the first detection signal to the detection signal output terminal. When the trigger signal is less than When the reference signal is used, the comparison module outputs a second detection signal to the detection signal output terminal.

In a first possible implementation of the first aspect, the trigger module includes a current limiting submodule and an isolation submodule, the isolation submodule is respectively connected to the voltage input module and the comparison module, and the current limiting submodule is arranged between the isolation submodule and the voltage input module. Between the input modules; the current limiting sub-module is used to output the current signal to the isolation sub-module according to the voltage signal input by the voltage input module. When the voltage signal input by the voltage input module is greater than the first voltage threshold and less than the second voltage threshold, the current limiting sub-module The current signal output by the module to the isolation submodule is greater than the first current threshold and less than the second current threshold; the isolation submodule is used when the current signal output by the current limiting submodule to the isolation submodule is greater than the first current threshold and less than the second current threshold , and output a trigger signal to the comparison module.

In a second possible implementation of the first aspect, the voltage detection circuit further includes a follower module, the follower module is located between the trigger module and the comparison module, and the follower module is configured to receive the trigger signal output by the trigger module, and send The comparison module sends a follow signal, which has the same characteristics as the trigger signal.

In combination with the first possible implementation of the first aspect, in the third possible implementation, the current limiting sub-module includes a first resistor, the isolation sub-module includes a bidirectional optocoupler and a second resistor, and the first end of the bidirectional optocoupler Connect with the second terminal of the first resistor, connect the second terminal of the bidirectional optocoupler with the second terminal of the voltage input module, connect the third terminal of the bidirectional optocoupler with the voltage input terminal, and connect the fourth terminal of the bidirectional optocoupler with the comparison module And the first end of the second resistor is connected, the first end of the first resistor is connected to the first end of the voltage input module, and the second end of the second resistor is grounded.

In combination with the second possible implementation of the first aspect, in the fourth possible implementation, the follower module includes an amplifier unit, the non-inverting input terminal of the amplifier unit is connected to the trigger module, and the inverting input terminal of the amplifier unit is connected to the amplifier unit output connection.

With reference to the third possible implementation of the first aspect, in a fifth possible implementation, the isolation submodule further includes a first capacitor, the first end of the first capacitor is connected to the first end of the second resistor, and the first The second end of the capacitor is grounded.

In a sixth possible implementation of the first aspect, the reference module includes a third resistor and a fourth resistor, the first end of the third resistor is connected to the voltage input end, the second end of the third resistor is connected to the comparison module, The first end of the fourth resistor is connected to the comparison module, and the second end of the fourth resistor is grounded.

In the seventh possible implementation of the first aspect, the comparison module includes a comparator unit and a fifth resistor, the non-inverting input terminal of the comparator unit is connected to the trigger module, and the inverting input terminal of the comparator unit is connected to the reference module , the output terminal of the comparator unit is connected to the detection signal output terminal, the first terminal of the fifth resistor is connected to the voltage input terminal, and the second terminal of the fifth resistor is connected to the output terminal of the comparator unit.

In the second aspect, the embodiment of the utility model provides a voltage detection system, including the voltage detection circuit and the processing module in the first aspect and any possible implementation of the first aspect, and the detection signal of the processing module and the voltage detection circuit The output end is connected, and the processing module is used to execute the first operation when the detection signal output end outputs the first detection signal to the processing module, and execute the second operation when the detection signal output end outputs the second detection signal to the processing module.

In the voltage detection circuit and system provided by the embodiments of the present invention, the trigger module receives the voltage signal input from the voltage input terminal, and when the voltage signal input from the voltage input terminal meets the detection requirements, it outputs to the comparison module connected to the trigger module At the same time, the reference module connected to the comparison module sends a reference signal to the comparison module, and the comparison module compares the trigger signal with the reference signal output by the reference module, so that when the trigger signal is rising or the comparison module has not received the trigger When the signal is high, the comparison module outputs the second detection signal to the detection signal output end, and when the trigger signal is stable, the comparison module outputs the first detection signal to the detection signal output end, so as to avoid the interference between the detection signal and the possible interference signal caused by the rising process. result interference. Therefore, the voltage detection circuit provided by the embodiment of the utility model can avoid the interference of the interference signal on the detection result when detecting the AC voltage with a relatively high voltage range, thereby improving the detection efficiency and detection reliability, and reducing the detection cost.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention For some novel embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a schematic structural diagram of an AC voltage signal detection system provided by an embodiment of the present invention;

2 is a schematic structural diagram of a voltage detection circuit provided by an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a voltage detection circuit provided by another embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a voltage detection circuit provided by another embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a voltage detection system provided by an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In order to clearly describe the technical solutions of the embodiments of the utility model, in the embodiments of the utility model, words such as "first" and "second" are used to distinguish the same or similar items with basically the same function and effect, Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order.

Our country usually adopts rated 220V, 50Hz AC as the mains standard, so most equipment or systems that use AC use 220V, 50Hz AC signals to feed back status information. At the same time, according to the "GB/T 12325-2008 Power Quality Supply Voltage Deviation" standard, the 220V single-phase power supply voltage deviation is -10% to +7% of the standard voltage, that is, 198V to 235.4V. , It is necessary to detect AC voltage signals with a voltage range of 198V to 235.4V. Since the voltage of the AC voltage signal to be detected is relatively high, the sensors in the prior art cannot directly detect the AC voltage signal.

In view of the above problems, as shown in Figure 1, an embodiment of the present invention provides an AC voltage signal detection system, including AC power equipment 101, transformer equipment 102, and detection equipment 103, wherein the AC power equipment output voltage For an AC voltage signal with a relatively high range, such as 198V to 235.4V, the transformer device 102 transforms the AC voltage signal with a relatively high voltage range output by the AC electrical equipment and converts it into a DC voltage signal, and outputs a voltage signal to the detection device 103 with a relatively high voltage range. For a DC voltage signal as low as 3.3V to 5V, the detection device 103 receives the DC voltage signal with a lower voltage range, and detects the AC voltage signal with a higher voltage range by detecting the DC voltage signal with a lower voltage range the goal of.

However, in the AC voltage signal detection system provided in the above embodiments, the transformer equipment 102 requires many components, and the volume and weight of the voltage transformer 102 are large, and the circuit is complex, which leads to the manufacture and use of the AC voltage signal detection system. The cost and difficulty of use are high, so the detection cost of this detection method is high, and the detection efficiency and detection reliability are low.

To address the above problems, as shown in Figure 2, an embodiment of the present invention provides a voltage detection circuit, including: a voltage input module 201, a trigger module 202, a comparison module 203, a reference module 204, and a detection signal output terminal F1;

202 The trigger module is connected to the voltage input module 201 and the comparison module 203 respectively, and the comparison module 203 is connected to the reference module 204 and the detection signal output terminal F1 respectively;

The trigger module 202 is configured to receive a voltage signal from the voltage input module 201, and output a trigger signal to the comparison module 203 when the voltage signal is greater than the first voltage threshold and less than the second voltage threshold;

A reference module 204, configured to output a reference signal to the comparison module 203;

The comparison module 203 is used to compare the trigger signal and the reference signal. When the trigger signal voltage is greater than the reference signal voltage, the comparison module 203 outputs the first detection signal to the detection signal output terminal F1. When the trigger signal voltage is less than the reference signal voltage, the comparison module 203 outputs the second detection signal to the detection signal output terminal F1.

Wherein, the voltage input module 201 is used to input a voltage signal to the trigger module 202, and the voltage signal may be an AC voltage signal or a DC voltage signal. Specifically, as shown in FIG. 2 , the voltage input module 201 may include a voltage input module The first end E1 of 201 is connected to the second end E2 of the voltage input module 201, the first end of the trigger module 202 is connected to the first end E1 of the voltage input module 201, and the second end of the trigger module 202 is connected to the second end of the voltage input module 201. The two terminals E2 are connected. When the voltage signal is an AC voltage signal, the voltage input module 201 outputs the AC voltage signal to the trigger module 202 through the first terminal E1 of the voltage input module 201 and the second terminal E2 of the voltage input module 201. When the When the voltage signal is a DC voltage signal, the voltage input module 201 outputs a DC voltage signal to the trigger module 202 through the first end E1 of the voltage input module 201, and the second end E2 of the corresponding voltage input module 201 is grounded, or the voltage input module 201 passes through The second terminal E2 of the voltage input module 201 outputs a DC voltage signal to the trigger module 202, and the corresponding first terminal E1 of the voltage input module 201 is grounded.

The voltage threshold can be preset in the trigger module 202. When the voltage signal received by the trigger module 202 is greater than the first voltage threshold and less than the second voltage threshold, it is considered that the voltage signal meets the preset detection requirements, and the trigger module 202 compares the The module 203 outputs a trigger signal to notify the trigger module 202 that the received voltage signal meets a preset detection requirement.

The trigger signal can be a voltage signal or a current signal. Correspondingly, when the trigger signal is a voltage signal, the reference signal is also a voltage signal, and when the trigger signal is a current signal, the reference signal is also a current signal. Preferably, both the trigger signal and the reference signal are voltage signals.

Specifically, when the trigger module 202 outputs the trigger signal to the comparison module 203, since the trigger signal has a rising process in the generation process, and the rising process of the trigger signal is similar to the interference signal that the trigger module 202 may output to the comparison module 203, if Directly outputting the trigger signal to the detection signal output terminal may easily cause misjudgment of the device receiving the trigger signal. Therefore, the comparison module 203 outputs the second detection signal to the signal output terminal when the trigger signal does not meet the output condition, that is, the trigger signal is less than the reference signal; Output a first detection signal. Therefore, when the comparison module 203 receives the trigger signal in the rising process and the possible interference signal and the comparison module 203 does not receive the trigger signal, it outputs a second detection signal to the signal output terminal, indicating that the voltage detection circuit has not detected a condition that satisfies A voltage signal required by voltage detection; when the comparison module 203 receives a trigger signal in a stable state, it outputs a first detection signal to the signal output terminal, indicating that the voltage detection circuit detects a voltage signal that meets the voltage detection requirement.

In the voltage detection circuit provided by the embodiment of the present invention, the trigger module receives the voltage signal input from the voltage input terminal, and outputs a trigger signal to the comparison module connected to the trigger module when the voltage signal input from the voltage input terminal meets the detection requirements , at the same time, the reference module connected to the comparison module sends a reference signal to the comparison module, and the comparison module compares the trigger signal with the reference signal output by the reference module, so that when the trigger signal is rising or the comparison module does not receive the trigger signal The comparison module outputs the second detection signal to the detection signal output terminal, and the comparison module outputs the first detection signal to the detection signal output terminal when the trigger signal is stable, so as to avoid the interference of the detection result due to the trigger signal and the possible interference signal in the rising process. interference. Therefore, the voltage detection circuit provided by the embodiment of the utility model can avoid the interference of the interference signal on the detection result when detecting the AC voltage with a relatively high voltage range, thereby improving the detection efficiency and detection reliability, and reducing the detection cost.

Specifically, as shown in accompanying drawings 3 and 4, the trigger module 202 includes a current limiting submodule 205 and an isolation submodule 206, the isolation submodule 206 is connected to the voltage input module 201 and the comparison module 203 respectively, and the current limiting submodule 205 set between the isolation sub-module 206 and the voltage input module 201;

The current limiting submodule 205 is used to output the current signal to the isolation submodule 206 according to the voltage signal input by the voltage input module 201. When the voltage signal input by the voltage input module 201 is greater than the first voltage threshold and less than the second voltage threshold, the current limiting submodule The current output by the module 205 to the isolation sub-module 206 is greater than the first current threshold and less than the second current threshold;

The isolation sub-module 206 is configured to output a trigger signal to the comparison module 203 when the current output by the current limiting sub-module 205 to the isolation sub-module is greater than the first current threshold and less than the second current threshold.

The current limiting sub-module 205 is used to ensure that the current passing through the isolation sub-module 205 does not exceed a preset rated value, so as to avoid damage to the isolation sub-module 205 when the current passing through the isolation sub-module 205 exceeds the rated value. The value may be preset or determined according to the type of the isolation sub-module 205 . Specifically, the current limiting sub-module 205 can be a resistance unit with adjustable resistance. When different voltage ranges are detected in different occasions, the purpose of protecting and isolating the sub-module 205 can be achieved by adjusting the resistance of the current limiting sub-module 205 .

The isolation sub-module 206 is used to output a weak electric signal with a lower voltage, that is, a trigger signal, to the comparison module 203 according to the current output from the current-limiting sub-module 205 to the isolation sub-module 206, so as to achieve when the voltage range input from the voltage input module 201 is relatively low. When the large voltage signal is within a certain voltage range, for example greater than the first voltage threshold and less than the second voltage threshold, the isolation sub-module 206 notifies the comparison module of the purpose in the form of a weak electrical signal with a lower voltage. Specifically, as shown in FIG. 3 , the current limiting sub-module 205 may be a first resistor R1, and the isolation sub-module 206 may include a bidirectional optocoupler O1 and a second resistor R2. The bidirectional optocoupler O1 may include light emitting diodes (English full name: LightEmitting Diode, English abbreviation: LED) L1, L2, and a phototransistor L3. The first end of the first resistor R1 is connected to the first end E1 of the voltage input module 201, the second end of the first resistor R1 is connected to the anode of L1, and the anode of L2 is connected to the second end of the voltage input module 201, while L1 The anode of L1 is connected to the cathode of L2, and the cathode of L1 is connected to the anode of L2, so that L1 and L2 are connected in reverse parallel, so that one LED is always lit when L1 and L2 pass through the alternating current. The first terminal of the phototransistor L3 is connected to the voltage input terminal VCC, the second terminal of the phototransistor L3 is connected to the first terminal of the second resistor R2 and the comparison module 203, and the second terminal of the second resistor R2 is grounded, so that the phototransistor The first end of L3 and the second end of the phototransistor L3 are turned on when L1 or L2 is on, so that the bidirectional optocoupler O1 sends a trigger signal to the comparison module through the second end of the phototransistor L3. The trigger signal is input by the voltage The voltage signal input from the terminal VCC, so that when the voltage signal with a larger voltage range input by the voltage input module 201 meets the detection requirements, the comparison module is notified by a trigger signal with a lower voltage range, so that the voltage signal input by the voltage input module 201 is consistent with The voltage signal isolation for signal transmission inside the detection circuit, wherein the second resistor R2 is used to limit the current passing through the first end of the phototransistor L3 and the second end of the phototransistor L3, so as to prevent the phototransistor L3 from being damaged due to excessive current passing.

Preferably, the voltage of VCC is 1.3V, the voltage signal input by the voltage input module 201 is an AC voltage of 220V, the conduction current range of L1 and L2 is 2mA to 10mA, and the resistance of the first resistor is 100K.

Preferably, the isolation sub-module 206 further includes a first capacitor C1, the first end of the first capacitor C1 is connected to the first end of the second resistor R2, the second end of the first capacitor C1 is grounded, and the first capacitor C1 is used for stabilizing The voltage of the trigger signal output from the second end of the phototransistor L3.

Specifically, as shown in the accompanying drawings 3 and 4, the voltage detection circuit also includes a follower module 207, the follower module 207 is located between the trigger module 202 and the comparison module 203, and the follower module 207 is used to receive the trigger signal output by the trigger module 202 , and send a follow signal to the comparison module 203 according to the trigger signal, the follow signal has the same characteristics as the trigger signal.

Wherein, since the trigger module 202 itself often has relatively weak output power, if the trigger signal output by the trigger module 202 is directly output as a detection signal, the trigger signal will be extremely unstable. Therefore, the follower module 207 receives the trigger signal, and The signal sends a following signal with the same characteristics as the trigger signal to the comparison module, so that the comparison module 203 can perform corresponding processing according to the follow signal, and avoid affecting the stability of the trigger signal.

Preferably, as shown in Figure 4, the trigger module 202 includes an amplifier unit A1, wherein the same input terminal of the amplifier unit A1 is connected to the trigger module, and the reverse input terminal of the amplifier unit A1 is connected to the output terminal of the amplifier unit, so that When the amplifier unit A1 is in a high-impedance state for the trigger module 202 , the amplifier unit A1 is in a low-impedance state for the comparison module, so that the amplifier unit A1 is isolated from the impact of the comparison module 203 on the trigger module 202 . Preferably, the amplifier unit A1 is an LM324 follower.

Specifically, as shown in FIG. 4 , the reference module 204 includes a third resistor R3 and a fourth resistor R4, the first end of the third resistor R3 is connected to the voltage input terminal VCC, and the second end of the third resistor R3 is connected to the comparison module 203 , the first end of the fourth resistor R4 is connected to the comparison module 203 , and the second end of the fourth resistor R4 is grounded.

Wherein the third resistor R3 and the fourth resistor R4 are voltage dividing resistors, by adjusting the ratio of the resistance of the third resistor R3 to the fourth resistor R4, the voltage of the reference signal output from the reference module 204 to the comparison module 203 can be conveniently adjusted . Preferably, the resistance values of the third resistor R3 and the fourth resistor R4 are both 10KΩ. At this time, when the voltage of the trigger signal is greater than half of the voltage input by the voltage input terminal, the comparison module outputs the first detection signal. When the voltage of the trigger signal When it is less than half of the voltage input by the voltage input terminal, the comparison module outputs a second detection signal.

Specifically, as shown in FIG. 4 , the comparison module 203 includes a comparator unit A2 and a fifth resistor R5, the non-inverting input terminal of the comparator unit A2 is connected to the trigger module 202, and the inverting input terminal of the comparator unit A2 is connected to the reference The module 204 is connected, the output terminal of the comparator unit A2 is connected with the detection signal output terminal F1, the first terminal of the fifth resistor R5 is connected with the voltage input terminal VCC, and the second terminal of the fifth resistor R5 is connected with the output terminal of the comparator unit A2 .

Wherein when the voltage of the trigger signal input by the same direction input terminal of the comparator unit A2 is greater than the voltage of the signal input by the inverting input terminal of the comparator unit A2, the output terminal of the comparator unit A2 outputs a high level, that is, the first detection signal, When the voltage of the trigger signal input by the same input terminal of the comparator unit A2 is less than the voltage of the signal input by the inverting input terminal of the comparator unit A2, the output terminal of the comparator unit A2 outputs a low level, that is, the second detection signal, and at the same time By adjusting the resistance value of the fifth resistor R5, the magnitude of the high-level voltage output from the output terminal of the comparator unit A2 can be adjusted, so that when the trigger signal is in the rising stage or the comparison module does not receive the trigger signal, the comparison module sends the detection signal The output end outputs the second detection signal, and when the trigger signal is stable, the comparison module outputs the first detection signal to the detection signal output end, thereby avoiding the interference of the interference signal on the detection result when detecting the AC voltage with a high voltage range, and improving the The detection efficiency and detection reliability reduce the detection cost.

As shown in Figure 5, the embodiment of the present invention provides a voltage detection system 301, including the voltage detection circuit 302 and the processing module 303 provided in the above embodiment, wherein the detection signal output of the processing module 303 and the voltage detection circuit 302 The terminals are connected, and the processing module 303 is configured to perform the first operation when the detection signal output terminal outputs the first detection signal to the processing module, and perform the second operation when the detection signal output terminal outputs the second detection signal to the processing module.

Wherein the first operation and the second operation may be corresponding operations determined based on logic preset in the processing module. Exemplarily, the processing module 303 is configured to send an alarm signal when the detection signal output terminal outputs a first detection signal to the processing module, and stop sending the alarm signal when the detection signal output terminal outputs a second detection signal to the processing module.

Preferably, the processing module 303 is a microcontroller MSP430F5310PT, and the detection signal output terminal of the voltage detection circuit 302 is connected to the P63 pin of the microcontroller MSP430F5310PT.

A voltage detection system provided by an embodiment of the present invention outputs a trigger signal to the comparison module when the voltage signal input at the voltage input terminal meets the detection requirements, and compares the trigger signal with the reference signal output by the reference module in the comparison module. Compare, so that when the trigger signal is in the rising stage or the comparison module does not receive the trigger signal, the comparison module outputs the second detection signal to the detection signal output end, and when the trigger signal is stable, the comparison module outputs the first detection signal to the detection signal output end. Signal. Therefore, the voltage detection circuit provided by the embodiment of the utility model can avoid the interference of the interference signal on the detection result when detecting the AC voltage with a relatively high voltage range, thereby improving the detection efficiency and detection reliability, and reducing the detection cost.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (9)

1. a voltage detecting circuit, it is characterised in that including: voltage input module, trigger module, Comparison module, referrer module, detect signal output part；

Described trigger module is connected with described voltage input module and described comparison module respectively, described ratio Relatively module is connected with described referrer module and described detection signal output part respectively；

Described trigger module, is configured to receive voltage signal, when described electricity from described voltage input module When pressure signal is more than the first voltage threshold and less than the second voltage threshold, trigger to the output of described comparison module Signal；

Described referrer module, is configured to export reference signal to described comparison module；

Described comparison module, is configured to described in comparison trigger signal and described reference signal, touches when described When signaling more than described reference signal, described comparison module exports first to described detection signal output part Detection signal, when described triggering signal is less than described reference signal, described comparison module is to described detection Signal output part output the second detection signal.

Voltage detecting circuit the most according to claim 1, it is characterised in that described trigger module Including current limliting submodule and separaant module, described separaant module is respectively connecting to described voltage input mould Block and described comparison module, it is defeated with described voltage that described current limliting submodule is arranged at described separaant module Enter intermodule；

Described current limliting submodule for according to described voltage input module input voltage signal to described every Ion module output current signal, when the voltage signal of described voltage input module input is more than described first Voltage threshold and less than described second voltage threshold time, described current limliting submodule is defeated to described separaant module The current signal gone out is more than the first current threshold and less than the second current threshold；

Described separaant module is for the electric current exported to described separaant module when described current limliting submodule When signal is more than described first current threshold and less than described second current threshold, defeated to described comparison module Go out described triggering signal.

Voltage detecting circuit the most according to claim 1, it is characterised in that described voltage detecting Circuit also includes following module, described in follow module be positioned at described trigger module and described comparison module it Between, described in follow module for receiving the triggering signal of described trigger module output, and according to described triggering Signal to described comparison module send follow signal, described in follow signal and described triggering signal characteristic phase With.

Voltage detecting circuit the most according to claim 2, it is characterised in that described current limliting submodule Block includes that the first resistance, described separaant module include two-way optocoupler and the second resistance, described two-way optocoupler The first end be connected with the second end of described first resistance, the second end of described two-way optocoupler and described voltage Second end of input module connects, and the 3rd end of described two-way optocoupler is connected with voltage input end, described double It is connected with the first end of described comparison module and described second resistance to the 4th end of optocoupler, described first First end of resistance is connected with the first end of described voltage input module, the second termination of described second resistance Ground.

Voltage detecting circuit the most according to claim 3, it is characterised in that described in follow module Including amplifier unit, the input in the same direction of described amplifier unit is connected with described trigger module, described The reverse input end of amplifier unit is connected with the outfan of described amplifier unit.

Voltage detecting circuit the most according to claim 4, it is characterised in that described isolation submodule Block also includes that the first electric capacity, the first end of described first electric capacity are connected with the first end of described second resistance, Second end ground connection of described first electric capacity.

Voltage detecting circuit the most according to claim 1, it is characterised in that described referrer module Including the 3rd resistance and the 4th resistance, the first end of described 3rd resistance is connected with voltage input end, described Second end of the 3rd resistance is connected with described comparison module, and the first end of described 4th resistance compares with described Module connects, the second end ground connection of described 4th resistance.

Voltage detecting circuit the most according to claim 1, it is characterised in that described comparison module Including comparator unit and the 5th resistance, the input in the same direction of described comparator unit and described trigger module Connecting, the reverse input end of described comparator unit is connected with described referrer module, described comparator unit Outfan be connected with described detection signal output part, the first end of described 5th resistance and voltage input end Connecting, described second end of the 5th resistance is connected with the outfan of described comparator unit.

9. a voltage detecting system, it is characterised in that include the arbitrary described electricity of claim 1-8 Pressure testing circuit and processing module, described processing module is defeated with the detection signal of described voltage detecting circuit Going out end to connect, described processing module is for when described detection signal output part is to described processing module output the During one detection signal, perform the first operation, when described detection signal output part exports to described processing module During the second detection signal, perform the second operation.