CN206400040U - One kind load missing detecting circuit - Google Patents
One kind load missing detecting circuit Download PDFInfo
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- CN206400040U CN206400040U CN201621448268.2U CN201621448268U CN206400040U CN 206400040 U CN206400040 U CN 206400040U CN 201621448268 U CN201621448268 U CN 201621448268U CN 206400040 U CN206400040 U CN 206400040U
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Abstract
Missing detecting circuit is loaded the utility model discloses one kind, including：Detection module and signal amplification module, detection module are used for when load conduction to be detected, the second end output voltage of detection module is higher than the voltage signal of first end, when load to be detected disconnects, and make the second end no signal output of detection module；Signal amplification module is used to export after being amplified processing to the signal that detection module is exported.Whether load conduction to be detected to be judged by way of detecting the presence of signal output to detection module, it is not necessary to increase match protocol module and digital circuit blocks, therefore structure is simpler, cost is relatively low.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a load loses detection circuitry.
Background
In the EOC field, when the power supply is supplying, the voltage is generally transmitted to the load through the coaxial cable, but when the load is disconnected accidentally, it is necessary to know that the load is lost to cut off the power supply line, otherwise, when another load is mistakenly connected next time, the voltage of the power supply is directly added to cause damage to the load equipment. Therefore, it is necessary to detect whether the load is lost or not in real time.
Currently, the detection of the load is mainly realized by changing or adding a protocol. By setting a loss detection timer, a detection parameter for confirming loss is added to the subscription data of the load. When the network side equipment receives the attachment request of the load, the signing data of the network side equipment is obtained, the loss of the load is detected, and the signing data is reported when the loss of the load is detected, so that the detection on whether the load is lost or not is realized.
However, in the existing scheme, the load loss is detected by changing the protocol, so that modules matching the protocol need to be added to the power supply and the load, and the existing scheme is complex and has a large change amount; and the existing scheme needs a plurality of digital circuit modules, such as a timer, a processing unit and the like, and the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a load loss detection circuit, which does not need to increase a matching protocol module and a digital circuit module, and can solve the problems of complex load loss detection and high cost existing in the prior art.
Therefore, the embodiment of the present invention provides a load loss detection circuit, include: the device comprises a detection module and a signal amplification module; wherein,
the first end of the detection module is connected with the negative electrode of the power supply, and the second end of the detection module is connected with the load to be detected and the input end of the signal amplification module;
the detection module is used for enabling the second end of the detection module to output a voltage signal with a voltage higher than that of the first end when the load to be detected is switched on; when the load to be detected is disconnected, no signal is output from the second end of the detection module;
and the signal amplification module is used for amplifying the signal output by the detection module and then outputting the signal.
Preferably, in the above load loss detection circuit provided by the embodiment of the present invention, the detection module includes a first diode or at least two first diodes connected in series.
Preferably, in the above load loss detection circuit provided in the present invention, the detection module further includes a first capacitor connected between the first end and the second end of the detection module.
Preferably, in the above load loss detection circuit provided in the embodiment of the present invention, the detection module further includes a first resistor connected in parallel with the first capacitor.
Preferably, in the circuit for detecting load loss provided by the embodiment of the present invention, the signal amplification module includes a second resistor, a triode, a third resistor and a voltage source; the first end of the second resistor is the input end of the signal amplification module, the second end of the second resistor is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, and the collector electrode of the triode is the output end of the signal amplification module; the third resistor is connected between the voltage source and the output end of the signal amplification module;
or the signal amplification module comprises a field effect transistor, a third resistor and a voltage source; the grid electrode of the field effect transistor is the input end of the signal amplification module, the source electrode of the field effect transistor is grounded, and the drain electrode of the field effect transistor is the output end of the signal amplification module; the third resistor is connected between the voltage source and the output end of the signal amplification module.
Preferably, in the above load loss detection circuit provided in the embodiment of the present invention, the load loss detection circuit further includes a second capacitor connected in parallel to both ends of the third resistor.
Preferably, in the above load loss detection circuit provided in the embodiment of the present invention, the load loss detection circuit further includes a first filtering module connected between the positive electrode of the power supply and the load to be detected, and a second filtering module connected between the second end of the detecting module and the load to be detected; wherein,
the first filtering module is used for filtering and carrying out noise processing on signals from the power supply to the load to be detected;
the second filtering module is used for filtering and noise processing the feedback signal from the load to be detected to the direction of the detecting module.
Preferably, in the utility model provides an among the above-mentioned load loss detection circuitry that provides, first filter module including connect in power supply's positive pole with wait to detect first inductance between the load and parallelly connected in the first diode at first inductance both ends.
Preferably, in the above-mentioned load loss detection circuit that the embodiment of the present invention provides, the second filtering module includes a second end connected to the detection module and a second inductor connected in parallel to the second diode at both ends of the second inductor, between the loads to be detected.
Preferably, in the above load loss detection circuit provided in the embodiment of the present invention, the load loss detection circuit further includes a third capacitor connected between the positive electrode of the power supply and the second end of the detection module.
The embodiment of the utility model provides a load loss detection circuit, include: the detection module is used for enabling the second end of the detection module to output a voltage signal with a voltage higher than that of the first end when the load to be detected is switched on, and enabling the second end of the detection module to have no signal output when the load to be detected is switched off; the signal amplification module is used for amplifying the signal output by the detection module and then outputting the signal. Whether the load to be detected is conducted or not is judged by detecting whether the signal is output or not through the detection module, and a matching protocol module and a digital circuit module are not required to be added, so that the structure is simpler, and the cost is lower.
Drawings
Fig. 1 is a schematic structural diagram of a load loss detection circuit according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a load loss detection circuit according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a load loss detection circuit according to an embodiment of the present invention;
fig. 4 is a fourth schematic structural diagram of a load loss detection circuit according to an embodiment of the present invention;
fig. 5 is a fifth schematic structural diagram of a load loss detection circuit according to an embodiment of the present invention;
fig. 6 is a sixth schematic diagram of a load loss detection circuit according to an embodiment of the present invention.
Detailed Description
The following describes in detail a specific implementation of the load loss detection circuit according to an embodiment of the present invention with reference to the accompanying drawings.
The size and shape of the structures in the drawings do not reflect the true scale of the load loss detection circuit, and are merely illustrative of the present invention.
The embodiment of the utility model provides a pair of load loss detection circuit, as shown in figure 1, include: the device comprises a detection module 1 and a signal amplification module 2; wherein,
the first end of the detection module 1 is connected with the negative electrode of the power supply 3, and the second end of the detection module 1 is connected with the load 4 to be detected and the input end of the signal amplification module 2;
the detection module 1 is used for enabling the second end of the detection module 1 to output a voltage signal with a voltage higher than that of the first end when the load 4 to be detected is switched on; when the load 4 to be detected is disconnected, no signal is output from the second end of the detection module 1;
the signal amplification module 2 is used for amplifying the signal output by the detection module 1 and then outputting the signal.
The embodiment of the utility model provides a load loss detection circuit, include: the detection module is used for enabling the second end of the detection module to output a voltage signal with a voltage higher than that of the first end when the load to be detected is switched on, and enabling the second end of the detection module to have no signal output when the load to be detected is switched off; the signal amplification module is used for amplifying the signal output by the detection module and then outputting the signal. Whether the load to be detected is conducted or not is judged by detecting whether the signal is output or not through the detection module, and a matching protocol module and a digital circuit module are not required to be added, so that the structure is simpler, and the cost is lower.
Preferably, in the embodiment of the present invention, in the load loss detection circuit, as shown in fig. 2, the detection module 1 includes a first diode D1Or at least two first diodes D connected in series1(two first diodes D in FIG. 2)1By way of example), and is not limited thereto.
In specific implementation, in the above load loss detection circuit provided in the embodiment of the present invention, as shown in fig. 2, two first diodes D1Is connected to the load 4 to be detected, two first diodes D1Is connected to the negative pole of the power supply 3. So that when the load 4 to be detected is switched on, a current flows through the two first diodes D1When the voltage signal is applied, a voltage signal with a certain voltage drop is generated, so that the second end of the detection module 1 outputs the voltage signal to the signal amplification module 2; when the load 4 to be detected is disconnected, no current flows through the two first diodes D1Two first diodes D1The voltage drop is 0 and no current flows to the signal amplification module 2.
Preferably, in the specific implementation, in the above load loss detection circuit provided in the embodiment of the present invention, as shown in fig. 3, the load loss detection circuit further includes a first filtering module 5 connected between the positive electrode of the power supply 3 and the load 4 to be detected, and a second filtering module 6 connected between the second end of the detecting module 1 and the load 4 to be detected; the first filtering module 5 is used for filtering and noise processing signals from the power supply 3 to the load 4 to be detected; the second filtering module 6 is used for filtering and noise processing the feedback signal from the load 4 to be detected to the direction of the detecting module 1.
Preferably, in the implementation of the present invention, in the above load loss detection circuit provided in the embodiment of the present invention, as shown in fig. 3, the first filtering module 5 includes a first inductor L connected between the positive electrode of the power supply 3 and the load 4 to be detected1And is connected in parallel to the first inductor L1Two-terminal second diode D2. Wherein the second diode D2Is close to the load 4 to be detected, a second diode D2Is close to the positive pole of the power supply 3. The inductor has the function of resisting alternating current and direct current, so that direct current electric energy output by the power supply can be supplied to the load to be detected, and ripples and noise of the power supply end are prevented from being transmitted to the load to be detected.
Preferably, in the implementation of the present invention, in the above load loss detection circuit provided in the embodiment of the present invention, as shown in fig. 3, the second filtering module 6 includes a second inductor L connected between the second end of the detecting module 1 and the load 4 to be detected2And is connected in parallel to the second inductor L2Third diode D at two ends3. Wherein the third diode D3Is close to the cathode of the power supply 3, and a third diode D3Is close to the load 4 to be detected. Because the inductor has the function of resisting alternating current and direct current, the direct current electric energy output by the load to be detected can be provided for the detection module, and ripples and noise at the end of the load to be detected are prevented from being transmitted to the detection module.
Preferably, in the embodiment of the present invention, in the above load loss detection circuit, as shown in fig. 4, the detection module 1 further includes a first capacitor C connected between the first end and the second end of the detection module 11Therefore, the voltage signal output by the detection module is stably output, and when the load loss detection circuit is provided with the inductor, voltage amplitude oscillation caused by the inductor can be weakened.
Preferably, in the implementation, in the above load loss detection circuit provided in the embodiment of the present invention, as shown in fig. 4, the detection module 1 further includes a first capacitor C1Parallel first resistor R1Thereby providing a discharge path for the first capacitor C1 and for small noise currents.
Preferably, in the load loss detection circuit according to an embodiment of the present invention, as shown in fig. 5, the signal amplification module 2 includes a field effect transistor T1Third resistor R3And a voltage source Vcc; wherein, the field effect transistor T1The grid of the signal amplification module 2 is the input end of the field effect transistor T1The source electrode of the field effect transistor T is grounded1The drain electrode of the signal amplifying module 2 is the output end of the signal amplifying module; third resistor R3Connected between the voltage source Vcc and the output terminal of the signal amplification module 2. Thus, the field effect transistor T1Of a grid electrodeWhen receiving the voltage signal output by the second end of the detection module 1, the field effect transistor T1Conducting to output a low level signal; when the load 4 to be detected is disconnected, no current flows through the two first diodes D1The voltage drop across the two first diodes is 0 and no current flows to the field effect transistor T1The field effect transistor is turned off, thereby outputting a high level signal.
Alternatively, as shown in fig. 6, the signal amplification module 2 includes a second resistor R2And a triode Q1Third resistor R3And a voltage source Vcc; wherein the second resistor R2The first end of the first resistor is the input end of the signal amplification module 2, and the second resistor R2Second terminal of and triode Q1Is connected with the base electrode of a triode Q1The emitter of the transistor is grounded, and the triode Q1The collector of the signal amplification module 2 is the output end of the signal amplification module; third resistor R3Connected between the voltage source Vcc and the output terminal of the signal amplification module 2. Because of the triode Q1The base electrode of the current drive is opened, so a second resistor R is required to be connected in series with the input end of the signal amplification module 22Thus, when the transistor Q is used1When the base receives the voltage signal output by the second end of the detection module 1, the triode Q1Conducting to output a low level signal; when the load 4 to be detected is disconnected, no current flows through the two first diodes D1Two first diodes D1Has a voltage drop of 0, no current flows to the triode Q1Base electrode of the triode Q1Is turned off, thereby outputting a high level signal.
Preferably, in order to stabilize the signal output by the signal amplifying module during the implementation, in the load loss detection circuit provided by the embodiment of the present invention, as shown in fig. 5 and 6, the load loss detection circuit further includes a third resistor R connected in parallel3Of the two terminals of the second capacitor C2。
Preferably, during the concrete implementation, in order to further carry out filtering and noise processing to the signal by power supply to waiting to detect the load direction the embodiment of the utility model provides an among the above-mentioned load loss detection circuit that provides, ifAs shown in fig. 5 and 6, a third capacitor C connected between the positive electrode of the power supply 3 and the second end of the detection module 13。
The load loss detection circuit provided by the embodiment of the present invention is described in detail below with reference to two specific embodiments.
The first embodiment is as follows:
in specific implementation, in the load loss detection circuit provided in the embodiment of the present invention, as shown in fig. 5, when the signal amplification module 2 includes the field effect transistor T1Third resistor R3And a voltage source Vcc, the power supply 3 provides an initial working voltage for the load 4 to be detected, and when the load 4 to be detected is switched on, a current flows through the two first diodes D1When the voltage is applied, a voltage signal with a certain voltage drop is generated, so that the field effect transistor T1When the grid electrode of the transistor receives the voltage signal, the field effect transistor T1Conducting to output a low level signal; when the load 4 to be detected is disconnected, no current flows through the two first diodes D1The voltage drop across the two first diodes is 0 and no current flows to the field effect transistor T1Of the grid, field effect transistor T1Is turned off, thereby outputting a high level signal.
Example two:
in specific implementation, in the load loss detection circuit provided in the embodiment of the present invention, as shown in fig. 6, when the signal amplification module 2 includes the second resistor R2And a triode Q1Third resistor R3And a voltage source Vcc, the power supply 3 provides an initial working voltage for the load 4 to be detected, and when the load 4 to be detected is switched on, a current flows through the two first diodes D1A voltage signal with a certain voltage drop generated when the voltage signal is applied, and the voltage signal passes throughA second resistor R2Then input to the triode Q1Such as a triode Q1When the base receives the voltage signal, the triode Q1Conducting to output a low level signal; when the load 4 to be detected is disconnected, no current flows through the two first diodes D1The voltage drop across the two first diodes is 0 and no current flows to the transistor Q1Base electrode of the triode Q1Is turned off, thereby outputting a high level signal.
The embodiment of the utility model provides a load loss detection circuit, include: the detection module is used for enabling the second end of the detection module to output a voltage signal with a voltage higher than that of the first end when the load to be detected is switched on, and enabling the second end of the detection module to have no signal output when the load to be detected is switched off; the signal amplification module is used for amplifying the signal output by the detection module and then outputting the signal. Whether the load to be detected is conducted or not is judged by detecting whether the signal is output or not through the detection module, and a matching protocol module and a digital circuit module are not required to be added, so that the structure is simpler, and the cost is lower.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A load loss detection circuit, comprising: the device comprises a detection module and a signal amplification module; wherein,
the first end of the detection module is connected with the negative electrode of the power supply, and the second end of the detection module is connected with the load to be detected and the input end of the signal amplification module;
the detection module is used for enabling the second end of the detection module to output a voltage signal with a voltage higher than that of the first end when the load to be detected is switched on; when the load to be detected is disconnected, no signal is output from the second end of the detection module;
and the signal amplification module is used for amplifying the signal output by the detection module and then outputting the signal.
2. The load loss detection circuit of claim 1, wherein the detection module comprises one first diode or at least two first diodes in series.
3. The load loss detection circuit of claim 2, wherein the detection module further comprises a first capacitor connected between the first terminal and the second terminal of the detection module.
4. The load loss detection circuit of claim 3, wherein the detection module further comprises a first resistor in parallel with the first capacitor.
5. The load loss detection circuit of claim 1, wherein the signal amplification module comprises a second resistor, a transistor, a third resistor, and a voltage source; the first end of the second resistor is the input end of the signal amplification module, the second end of the second resistor is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, and the collector electrode of the triode is the output end of the signal amplification module; the third resistor is connected between the voltage source and the output end of the signal amplification module;
or the signal amplification module comprises a field effect transistor, a third resistor and a voltage source; the grid electrode of the field effect transistor is the input end of the signal amplification module, the source electrode of the field effect transistor is grounded, and the drain electrode of the field effect transistor is the output end of the signal amplification module; the third resistor is connected between the voltage source and the output end of the signal amplification module.
6. The load loss detection circuit of claim 5, further comprising a second capacitor connected in parallel across the third resistor.
7. The load loss detection circuit according to any one of claims 1 to 6, further comprising a first filtering module connected between the positive terminal of the power supply and the load to be detected, and a second filtering module connected between the second terminal of the detection module and the load to be detected; wherein,
the first filtering module is used for filtering and carrying out noise processing on signals from the power supply to the load to be detected;
the second filtering module is used for filtering and noise processing the feedback signal from the load to be detected to the direction of the detecting module.
8. The load loss detection circuit of claim 7, wherein the first filtering module comprises a first inductor connected between the positive terminal of the power supply and the load to be detected, and a second diode connected in parallel across the first inductor.
9. The load loss detection circuit of claim 7, wherein the second filtering module comprises a second inductor connected between the second end of the detection module and the load to be detected and a third diode connected in parallel across the second inductor.
10. The load loss detection circuit of claim 7, further comprising a third capacitor connected between the positive pole of the power supply and the second end of the detection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621448268.2U CN206400040U (en) | 2016-12-27 | 2016-12-27 | One kind load missing detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621448268.2U CN206400040U (en) | 2016-12-27 | 2016-12-27 | One kind load missing detecting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206400040U true CN206400040U (en) | 2017-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621448268.2U Expired - Fee Related CN206400040U (en) | 2016-12-27 | 2016-12-27 | One kind load missing detecting circuit |
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| CN (1) | CN206400040U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856492A (en) * | 2018-12-21 | 2019-06-07 | 中国航发控制系统研究所 | Electrohydraulic servo valve break detection circuit |
| CN110673057A (en) * | 2019-11-11 | 2020-01-10 | 上海联影医疗科技有限公司 | Load presence detection device and ion pump power supply system |
| CN112305457A (en) * | 2020-10-30 | 2021-02-02 | 深圳市沃特沃德股份有限公司 | Load break detection circuit and wired terminal device |
-
2016
- 2016-12-27 CN CN201621448268.2U patent/CN206400040U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109856492A (en) * | 2018-12-21 | 2019-06-07 | 中国航发控制系统研究所 | Electrohydraulic servo valve break detection circuit |
| CN109856492B (en) * | 2018-12-21 | 2021-02-09 | 中国航发控制系统研究所 | Electro-hydraulic servo valve broken line detection circuit |
| CN110673057A (en) * | 2019-11-11 | 2020-01-10 | 上海联影医疗科技有限公司 | Load presence detection device and ion pump power supply system |
| CN112305457A (en) * | 2020-10-30 | 2021-02-02 | 深圳市沃特沃德股份有限公司 | Load break detection circuit and wired terminal device |
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