CN215575389U - Passive load state detection circuit - Google Patents
Passive load state detection circuit Download PDFInfo
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- CN215575389U CN215575389U CN202120635573.7U CN202120635573U CN215575389U CN 215575389 U CN215575389 U CN 215575389U CN 202120635573 U CN202120635573 U CN 202120635573U CN 215575389 U CN215575389 U CN 215575389U
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- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 107
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000011897 real-time detection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
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Abstract
The utility model discloses a passive load state detection circuit which comprises a gating unit, a sampling power supply unit, a driving power supply interface unit, a sampling unit and a control unit. The gating unit is provided with a controlled end for receiving a control signal; the power supply end of the sampling power supply unit is connected with the first input end of the gating unit; the power supply end of the driving power supply interface unit is connected with the second input end of the gating unit; the sampling input end of the sampling unit is connected with the output end of the gating unit, and the sampling unit is also provided with a sampling output end for outputting a sampling signal. The passive load state detection circuit can detect whether the passive load is on line in real time or not in real time, and is favorable for timely eliminating potential safety hazards.
Description
Technical Field
The utility model relates to the technical field of passive load detection, in particular to a passive load state detection circuit.
Background
Whether passive loads are online in real time or not is known through real-time detection, and the passive loads comprise loads such as resistors, inductors, solenoid valves and the like. For a passive load with short service time and long standby time, if the passive load is not detected in real time, the passive load is not repaired when the passive load is damaged or can not act, and system paralysis and potential safety hazards can be caused due to untimely problem discovery.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides a passive load state detection circuit which can detect whether a passive load is on line or not in real time.
The passive load state detection circuit according to the embodiment of the present invention includes: the gating unit is provided with a controlled end for receiving a control signal; the power supply end of the sampling power supply unit is connected with the first input end of the gating unit; the power supply end of the driving power supply interface unit is connected with the second input end of the gating unit; the sampling unit, the sampling input of sampling unit with the output of gating unit is connected, the sampling unit still is provided with the sampling output who is used for exporting sampling signal.
The passive load state detection circuit provided by the embodiment of the utility model at least has the following beneficial effects: the circuit is connected with a controller, the output end of a control unit is connected with the controlled end of a gating unit, and the input end of the control unit is connected with the sampling output end of a sampling unit, wherein the control unit is used for sending a control signal to the gating unit and receiving a sampling signal output by the sampling unit. The passive load to be detected is connected to the circuit through the sampling input end of the sampling unit, and the external driving power supply is connected to the circuit through the driving power supply interface unit, so that the control unit can detect the state of the passive load in a standby state or a practical state through the circuit. When the passive load is in a standby state, the control unit controls the gating unit to connect the sampling power supply unit with the sampling unit, and the sampling unit is used for sampling the voltage of the passive load, so that the control unit obtains the sampling voltage of the sampling unit, and the control unit can judge whether the passive load is on line in real time or not through the sampling voltage; when the passive load is in a use state, the control unit controls the gating unit to connect the driving power supply interface unit with the sampling unit, so that the control unit judges whether the passive load is on line in real time or not by sampling voltage. Namely, the passive load is in a standby state or a use state, and the control unit can acquire sampling voltage through the sampling unit, so that the control unit can detect whether the passive load is on line or not in real time, and when the passive load is abnormal, problems can be found in time.
According to some embodiments of the present invention, the gating unit includes a relay K1 and a control loop, a first input pin of the relay K1 is connected to the power supply terminal of the sampling power supply unit, a second input pin of the relay K1 is connected to the power supply terminal of the driving power supply interface unit, an output pin of the relay K1 is connected to the sampling input terminal of the sampling unit, an input terminal of the control loop is configured to receive a control signal, and an output terminal of the control loop is connected to the controlled pin of the relay K1, so as to implement a gating function.
According to some embodiments of the present invention, the control circuit includes a switch Q1, the controlled pin of the switch Q1 is used for receiving a control signal, the input pin of the switch Q1 is grounded, and the output pin of the switch Q1 is connected to the controlled pin of the relay K1, so as to control the action of the relay K1.
According to some embodiments of the present invention, the control circuit further includes a freewheeling diode D1, the anode of the freewheeling diode D1 is connected to the controlled pin of the relay K1, and the cathode of the freewheeling diode D1 is connected to the power pin of the relay K1, so as to protect the switch Q1.
According to some embodiments of the present invention, the sampling unit includes a resistor R1, a resistor R2, and a resistor R3, a first end of the resistor R1 is connected to the output end of the gating unit, second ends of the resistors R1 are respectively connected to a first end of the resistor R2 and a first end of the resistor R3, a second end of the resistor R2 is grounded, and a second end of the resistor R3 is used for outputting a sampling signal to facilitate voltage sampling.
According to some embodiments of the present invention, the sampling unit further includes a zener diode D3, a cathode of the zener diode D3 is connected to the second end of the resistor R3, and an anode of the zener diode D3 is grounded, so as to stabilize the sampling voltage.
According to some embodiments of the utility model, the power supply further comprises an indicator light unit, wherein an input end of the indicator light unit is connected with an output end of the gating unit, and an output end of the indicator light unit is grounded so as to prompt whether power is supplied or not.
According to some embodiments of the present invention, the indicator light unit includes a light emitting diode D5 and a resistor R4, an anode of the light emitting diode D5 is connected to the output terminal of the gate unit, a cathode of the light emitting diode D5 is connected to a first terminal of the resistor R4, and a second terminal of the resistor R4 is grounded to indicate whether power is supplied.
According to some embodiments of the utility model, the device further comprises a schottky diode D4, wherein a cathode of the schottky diode D4 is connected with the output end of the gating unit, and an anode of the schottky diode D4 is grounded so as to protect components in the circuit.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block circuit diagram of a passive load condition detection circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of the passive load condition detection circuit shown in fig. 1.
The reference numbers are as follows:
the system comprises a gating unit 100, a control loop 110, a sampling power supply unit 200, a driving power supply interface unit 300, a sampling unit 400 and an indicator lamp unit 500.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1, a passive load state detection circuit includes a gating unit 100, a sampling power supply unit 200, a driving power supply interface unit 300, a sampling unit 400, and a control unit. The gating unit 100 is provided with a controlled terminal for receiving a control signal; the power supply terminal of the sampling power supply unit 200 is connected to the first input terminal of the gating unit 100; the power supply terminal of the driving power interface unit 300 is connected to the second input terminal of the gating unit 100; the sampling input terminal of the sampling unit 400 is connected to the output terminal of the gating unit 100, and the sampling unit 400 is further provided with a sampling output terminal for outputting a sampling signal.
Specifically, the circuit is connected to a controller, an output terminal of the control unit is connected to a controlled terminal of the gating unit 100, and an input terminal of the control unit is connected to a sampling output terminal of the sampling unit 400, wherein the control unit is configured to send a control signal to the gating unit 100 and receive a sampling signal output by the sampling unit 400. The passive load to be detected is connected to the circuit through the sampling input terminal of the sampling unit 400, and the external driving power is connected to the circuit through the driving power interface unit 300, so that the control unit can detect the state of the passive load in a standby state or a use state through the circuit. The passive load is connected to the output terminal of the gating cell 100 when the circuit detects whether the passive load is on-line. When the passive load is in a standby state, the control unit controls the gating unit 100 to connect the sampling power supply unit 200 with the sampling unit 400, and the sampling unit 400 is used for sampling the voltage of the passive load, so that the control unit obtains the sampling voltage of the sampling unit 400, and the control unit can judge whether the passive load is on line in real time or not by sampling the voltage; when the passive load is in a use state, the control unit controls the gating unit 100 to connect the driving power interface unit 300 with the sampling unit 400, so that the control unit judges whether the passive load is online in real time by sampling voltage. That is, the passive load is in a standby state or a use state, and the control unit can acquire the sampling voltage through the sampling unit 400, so that the control unit can detect whether the passive load is on line in real time, and when the passive load is abnormal, problems can be found in time.
Referring to fig. 2, taking the solenoid valve as an example of a passive load, there are cases where the solenoid valve needs to be stopped for a long time, and when the solenoid valve stops, it is not necessary to connect an external driving power supply to the solenoid valve, but the solenoid valve needs to be connected to a circuit, that is, in an online state; when the electromagnetic valve works, an external driving power supply needs to be connected to the electromagnetic valve, and the electromagnetic valve is also communicated with a circuit so as to be in an online state.
Based on this, when the electromagnetic valve stops operating, the control unit controls the gating unit 100, connects the sampling power supply unit 200 and the sampling unit 400, and connects the sampling power supply unit 200 and the electromagnetic valve, and then the control unit obtains the sampling voltage through the sampling unit 400. Whether the electromagnetic valve is connected with the circuit or not directly influences the size of the sampling voltage, so that the control unit can detect whether the electromagnetic valve is on line or not according to the size of the sampling voltage, problems can be found in time, potential safety hazards can be eliminated in time, and abnormal system operation is avoided. In addition, the sampling power supply unit 200 may employ a constant current source or a constant voltage power supply, and the sampling unit 400 and the solenoid valve are supplied with power by the constant current source or the constant voltage power supply. For example, a constant current source having an output current of 1mA is used, and the solenoid valve operates at a current of 1.5A, so that the constant current source cannot drive the solenoid valve to operate so as to sample the voltage and stop the solenoid valve.
When the electromagnetic valve works, the control unit controls the gating unit 100, the driving power interface unit 300 is connected with the sampling unit 400, the driving power interface unit 300 is connected with the electromagnetic valve, and then the control unit obtains sampling voltage through the sampling unit 400 so as to detect whether the electromagnetic valve is on line or not. Through the circuit, whether the electromagnetic valve is on line can be detected before and after the electromagnetic valve is switched between the stop action state and the working state, so that the on-line state of the electromagnetic valve can be detected in real time, and problems can be found in time.
In addition, the passive load may be a resistor, an inductor, or the like.
Referring to fig. 2, the gate unit 100 includes a relay K1 and a control circuit 110, a first input pin of the relay K1 is connected to a power supply terminal of the sampling power supply unit 200, a second input pin of the relay K1 has a power supply terminal of the driving power interface unit 300 connected thereto, an input terminal of the control circuit 110 is configured to receive a control signal, and an output terminal of the control circuit 110 is connected to a controlled pin of the relay K1.
The control circuit 110 controls the operation of the relay K1. Taking the 5-pin relay K1 as an example, the controlled pin and the power pin of the relay K1 are respectively connected to the coil inside the relay K1, and the power pin of the relay K1 is connected to a 5V power supply. When the control unit is connected to the circuit, the control unit inputs a control signal to the control circuit 110 through the input terminal of the control circuit 110, and the control circuit 110 connects the controlled pin of the relay K1 to the ground to operate the coil, so as to change the connection state between the first input pin, the second input pin and the output pin of the relay K1. For example, the output pin of the relay K1 is connected with the first input pin of the relay K1 and disconnected from the second input pin of the relay K1, instead, the output pin of the relay K1 is connected with the second input pin of the relay K1 and disconnected from the first input pin of the relay K1, so that the connection state between the sampling unit 400 and the sampling power supply unit 200 and the driving power supply interface unit 300 is changed, so that the control unit can detect whether the passive load is on-line in real time regardless of whether the passive load is in a standby state or a use state.
In addition, a first input pin of the relay K1 is a first input terminal of the gating unit 100, a second input pin of the relay K1 is a second input terminal of the gating unit 100, an output pin of the relay K1 is an output terminal of the gating unit 100, and an input terminal of the control circuit 110 is used as a controlled terminal of the gating unit 100.
Referring to fig. 2, the control circuit 110 includes a switch Q1, a controlled pin of the switch Q1 is used for receiving a control signal, an input pin of the switch Q1 is grounded, and an output pin of the switch Q1 is connected to a controlled pin of the relay K1. The switching tube Q1 may be a MOS tube or a triode. Taking the example that the switching tube Q1 adopts the MOS tube, the control unit sends a control signal to the controlled pin of the switching tube Q1, and the output pin of the switching tube Q1 is equivalent to ground, so that the controlled pin of the relay K1 is grounded, and the relay K1 operates, so as to gate the sampling power supply unit 200 or drive the power supply interface unit 300. For example, the relay K1 gates the sampling power supply unit 200 when the control unit gives no control signal, and gates the driving power supply interface unit 300 when the control unit gives a control signal.
It should be noted that, when the switching transistor Q1 adopts an N-channel MOS transistor, the control signal is a high level signal; when the switching tube Q1 adopts a P-channel MOS tube, the control signal is a low level signal.
In addition, the controlled pin of the switching tube Q1 is the input end of the control loop 110. According to practical requirements, a resistor R5 may also be connected in series between the controlled pin of the switching tube Q1 and the output terminal of the control unit, and a first end of a resistor R6 is connected to the controlled pin of the switching tube, and a second end of the resistor R6 is grounded, so as to facilitate the normal operation of the switching tube Q1.
Referring to fig. 2, the control circuit 110 further includes a freewheeling diode D1, an anode of the freewheeling diode D1 is connected to the controlled pin of the relay K1, and a cathode of the freewheeling diode D1 is connected to the power pin of the relay K1. The freewheeling diode D1 is used for protecting the switching tube Q1. Taking the 5-pin relay K1 as an example, a coil inside the relay K1 works after being energized, and at the moment after being de-energized, the coil has a counter electromotive force, and the counter electromotive force may damage the switching tube Q1. After the freewheeling diode D1 is connected, the switch tube Q1 can be prevented from being damaged by the counter electromotive force, so that the freewheeling diode D2 plays a role of protecting the switch tube Q1, the circuit normally works, and real-time detection on whether the passive load is in real time or not is facilitated.
Referring to fig. 2, the sampling unit 400 includes a resistor R1, a resistor R2, and a resistor R3, a first terminal of the resistor R1 is connected to the output terminal of the gating unit 100, a second terminal of the resistor R1 is connected to a first terminal of the resistor R2 and a first terminal of the resistor R3, a second terminal of the resistor R2 is grounded, and a second terminal of the resistor R3 is used for outputting a sampling signal. The connection node of the second end of the resistor R1, the first end of the resistor R2, and the first end of the resistor R3 is configured to sample a voltage of the passive load, that is, the control unit obtains a sampling signal through the second end of the resistor R3 to obtain a sampling voltage of the connection node, and determines whether the sampling voltage meets a set value through calculation and comparison to obtain a conclusion whether the passive load is online and a conclusion whether the driving power interface unit 300 outputs the sampling voltage. If the passive load is not on-line, the control unit can act in time, and potential safety hazards can be eliminated in time.
In addition, the sampling unit 400 further includes a zener diode D3, a cathode of the zener diode D3 is connected to the second end of the resistor R3, and an anode of the zener diode D3 is grounded. The voltage stabilizing diode D3 is used for stabilizing the voltage sent to the control unit through the resistor R3, so that the control unit can obtain stable and accurate sampling voltage, and the control unit can obtain accurate conclusion according to the accurate sampling voltage to avoid misjudgment.
Referring to fig. 2, the passive load state detection circuit further includes an indicator lamp unit 500, an input terminal of the indicator lamp unit 500 is connected to an output terminal of the gate unit 100, and an output terminal of the indicator lamp unit 500 is grounded. Specifically, the indicator light unit 500 includes a light emitting diode D5 and a resistor R4, an anode of the light emitting diode D5 is connected to the output terminal of the gate unit 100, a cathode of the light emitting diode D5 is connected to a first terminal of the resistor R4, and a second terminal of the resistor R4 is grounded. The indicator lamp unit 500 is used for indicating whether the sampling power supply unit 200 or the driving power supply interface unit 300 has power supply output, so that when power is available in the circuit, the probability of accidents caused by mistaken touch of an operator is reduced.
Referring to fig. 1, the passive load state detection circuit further includes a schottky diode D4, a cathode of the schottky diode D4 is connected to the output terminal of the gating cell 100, and an anode of the schottky diode D4 is grounded. Among them, the schottky diode D4 has advantages of high switching frequency and reduced forward voltage, and particularly has a short reverse recovery time, and can be used as a protection diode. The passive load is behind the disconnection with drive power supply interface unit 300, there may be great back electromotive force, this back electromotive force can cause the destruction to the circuit, and schottky diode D4 is used as the protection diode, the protection effect is better, can avoid the circuit to be destroyed under back electromotive force's effect, the life of improvement circuit, thereby reduce the cost that the circuit was changed, and be favorable to this circuit to the real-time detection of passive load, reduce because the circuit damages and can't detect the real-time online probability of passive load, make this circuit have higher reliability.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. A passive load condition detection circuit, comprising:
the gating unit is provided with a controlled end for receiving a control signal;
the power supply end of the sampling power supply unit is connected with the first input end of the gating unit;
the power supply end of the driving power supply interface unit is connected with the second input end of the gating unit;
the sampling unit, the sampling input of sampling unit with the output of gating unit is connected, the sampling unit still is provided with the sampling output who is used for exporting sampling signal.
2. The passive load status detection circuit according to claim 1, wherein the gating unit comprises a relay K1 and a control loop, a first input pin of the relay K1 is connected to the power supply terminal of the sampling power supply unit, a second input pin of the relay K1 has the power supply terminal of the driving power supply interface unit connected thereto, an output pin of the relay K1 is connected to the sampling input terminal of the sampling unit, an input terminal of the control loop is configured to receive a control signal, and an output terminal of the control loop is connected to the controlled pin of the relay K1.
3. The passive load state detection circuit of claim 2, wherein the control loop comprises a switch Q1, the controlled pin of the switch Q1 is configured to receive a control signal, the input pin of the switch Q1 is grounded, and the output pin of the switch Q1 is connected to the controlled pin of the relay K1.
4. The passive load state detection circuit of claim 3, wherein the control loop further comprises a freewheeling diode D1, the anode of the freewheeling diode D1 is connected to the controlled pin of the relay K1, and the cathode of the freewheeling diode D1 is connected to the power pin of the relay K1.
5. The passive load state detection circuit according to claim 1, wherein the sampling unit comprises a resistor R1, a resistor R2 and a resistor R3, a first end of the resistor R1 is connected to the output end of the gating unit, a second end of the resistor R1 is connected to a first end of the resistor R2 and a first end of the resistor R3, respectively, a second end of the resistor R2 is connected to ground, and a second end of the resistor R3 is used for outputting the sampling signal.
6. The passive load state detection circuit of claim 5, wherein the sampling unit further comprises a zener diode D3, a cathode of the zener diode D3 is connected to the second terminal of the resistor R3, and an anode of the zener diode D3 is connected to ground.
7. The passive load condition detection circuit of claim 1, further comprising an indicator light unit, an input of the indicator light unit being connected to the output of the gating unit, an output of the indicator light unit being connected to ground.
8. The passive load state detection circuit of claim 7, wherein the indicator light unit comprises a light emitting diode D5 and a resistor R4, wherein an anode of the light emitting diode D5 is connected to the output terminal of the gating unit, a cathode of the light emitting diode D5 is connected to a first terminal of the resistor R4, and a second terminal of the resistor R4 is grounded.
9. The passive load state detection circuit according to any one of claims 1 to 8, further comprising a Schottky diode D4, wherein a cathode of the Schottky diode D4 is connected to the output terminal of the gating cell, and an anode of the Schottky diode D4 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120635573.7U CN215575389U (en) | 2021-03-29 | 2021-03-29 | Passive load state detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120635573.7U CN215575389U (en) | 2021-03-29 | 2021-03-29 | Passive load state detection circuit |
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| Publication Number | Publication Date |
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| CN215575389U true CN215575389U (en) | 2022-01-18 |
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| CN202120635573.7U Active CN215575389U (en) | 2021-03-29 | 2021-03-29 | Passive load state detection circuit |
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| CN (1) | CN215575389U (en) |
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- 2021-03-29 CN CN202120635573.7U patent/CN215575389U/en active Active
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