CN209541918U - A kind of contactless temperature-measuring sensor - Google Patents
A kind of contactless temperature-measuring sensor Download PDFInfo
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- CN209541918U CN209541918U CN201920123040.3U CN201920123040U CN209541918U CN 209541918 U CN209541918 U CN 209541918U CN 201920123040 U CN201920123040 U CN 201920123040U CN 209541918 U CN209541918 U CN 209541918U
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Abstract
The utility model discloses a kind of contactless temperature-measuring sensors, comprising: the power supply for for being electrically connected with temperature transducer, the power supply lotus root are connected to power circuit, are provided with overvoltage crowbar in the DC output end of power circuit and the power supply line of load；By the way that overvoltage crowbar is arranged; the supply voltage of temperature transducer is monitored in real time; if there is overpressure situation; disconnect the power supply at over-voltage; it avoids high pressure from damaging temperature transducer, while the second capacitor is set in load outputs, the second capacitor is enabled to provide power supply to temperature transducer in over-voltage; it avoids temperature transducer from stopping working, influences the normal operation of follow-up work；The structure of the overvoltage crowbar is simple, and electronic component is few, low in cost, and component is small in size, and reduce circuit board accounts for plate suqare.
Description
Technical field
The utility model belongs to temperature transducer technical field, and in particular to a kind of contactless temperature-measuring sensor.
Background technique
It is well known that when using temperature sensor measurement temperature, whether contacted with testee by used sensor
Two major classes can be divided into: referred to as " contact " type with what testee directly contacted；It does not contact, but utilizes tested with by contact object
The heat radiation that object issues is known as " non-contact " type come what is measured；The power supply of traditional contactless temperature-measuring sensor generallys use
Battery, but had the contactless temperature-measuring sensor that can access alternating current progress power supply output now, to guarantee temperature transducer
Normal power supply, to the power supply of temperature transducer carry out protection be very it is necessary to.
Utility model content
To overcome technological deficiency of the existing technology, the utility model discloses a kind of contactless temperature-measuring sensors.
Technical solution adopted by the utility model to solve its technical problems is a kind of contactless temperature-measuring sensor, packets
Include: the power supply for for being electrically connected with temperature transducer, the supply coupling have a power circuit, the DC output end of power circuit and negative
Overvoltage crowbar is provided in the power supply line of load；The overvoltage crowbar includes: the 5th resistance, the 6th resistance, first
Triode, the second triode, the 7th resistance, the 8th resistance, metal-oxide-semiconductor, the 9th resistance, the tenth resistance, the second capacitor and third electricity
Hold；
The DC output end is connected in series with the 5th resistance and the 6th resistance, and one end of the 6th resistance connects the one or three pole
The common end of the collector of pipe, the emitter ground connection of the first triode, the 5th resistance and the 6th resistance connects the second triode
Base stage, DC output end are also connected with the source electrode of metal-oxide-semiconductor, and the drain electrode of metal-oxide-semiconductor is load outputs connection load, and DC output end is also
The first end of the 7th resistance is connected, for the second end of the 7th resistance by the 8th resistance eutral grounding, the grid of metal-oxide-semiconductor connects the 7th resistance
Second end, the emitter of the second triode connects the first end of the 7th resistance, the 7th electricity of collector connection of the second triode
Second end is hindered, is connected in series with the 9th resistance and the tenth resistance between the drain electrode and ground of metal-oxide-semiconductor, the 9th resistance and the tenth resistance
Common end connects the base stage of the first triode, and the both ends of the tenth resistance are connected in parallel third capacitor, and load outputs pass through second
Capacity earth.
Preferably, the power circuit includes: ACDC power supply chip, first resistor, second resistance, diode and the first electricity
Hold；AC power source is converted to DC power supply output by ACDC power supply chip, is connected between the output end and ground of ACDC power supply chip
It is connected with first resistor and second resistance, first resistor connects the anode of diode with the common end of second resistance, diode
Cathode connects the first end of first capacitor, the second end ground connection of first capacitor, and the cathode of diode connects DC output end.
Preferably, voltage stabilizing chip is connected between the cathode and DC output end of the diode, the cathode of diode connects
The input terminal of voltage stabilizing chip is connect, the output end of voltage stabilizing chip connects DC output end, the ground terminal ground connection of voltage stabilizing chip.
Preferably, the cathode of the diode is also connected with the input terminal of optical coupling isolator, and the output end of optical coupling isolator connects
The input terminal of voltage stabilizing chip is connect, the output end of optical coupling isolator also passes through the 4th resistance connection external power supply.
Preferably, 3rd resistor is also connected between the cathode of the diode and the input terminal of optical coupling isolator.
Preferably, the chip model that the voltage stabilizing chip uses is MC78057.
The beneficial effects of the utility model are: by setting overvoltage crowbar, to the supply voltage of temperature transducer into
If row real time monitoring disconnects the power supply at over-voltage there is overpressure situation, avoids high pressure from damaging temperature transducer, while negative
It carries output end and the second capacitor is set, enable the second capacitor to provide power supply to temperature transducer in over-voltage, avoid temperature transducers
Device stops working, and influences the normal operation of follow-up work；The structure of the overvoltage crowbar is simple, and electronic component is few, cost
Cheap, component is small in size, and reduce circuit board accounts for plate suqare.
Detailed description of the invention
Fig. 1 is the circuit diagram of overvoltage crowbar described in the utility model.
Fig. 2 is the circuit diagram of power circuit described in the utility model.
Appended drawing reference: V1- DC output end, ACDC-ACDC power supply chip, R1- first resistor, R2- second resistance, D1-
Diode, C1- first capacitor, AC- AC power source, R3- 3rd resistor, OC- optical coupling isolator, the 4th resistance of R4-, VCC- are external
Power supply, IC1- voltage stabilizing chip, the 5th resistance of R5-, the 6th resistance of R6-, the first triode of T1-, the second triode of T2-, R7- the 7th
Resistance, the 8th resistance of R8-, P1- metal-oxide-semiconductor, the 9th resistance of R9-, the tenth resistance of R10-, the second capacitor of C2-, C3- third capacitor,
VOUT- load outputs.
Specific embodiment
More detailed description is done to the embodiments of the present invention below in conjunction with attached drawing and appended drawing reference, makes to be familiar with ability
The technology people in domain can implement accordingly after studying this specification carefully.It should be appreciated that specific embodiment described herein is only to solve
The utility model is released, is not used to limit the utility model.
A kind of contactless temperature-measuring sensor, comprising: the power supply for for being electrically connected with temperature transducer, the power supply lotus root are connected to
Overvoltage crowbar is provided in power circuit, the DC output end V1 of power circuit and the power supply line of load；The over-voltage
Protecting circuit includes: the 5th resistance R5, the 6th resistance R6, the first triode T1, the second triode T2, the 7th resistance R7, the 8th
Resistance R8, metal-oxide-semiconductor P1, the 9th resistance R9, the tenth resistance R10, the second capacitor C2 and third capacitor C3；
The DC output end V1 is connected in series with the 5th resistance R5 and the 6th resistance R6, one end connection of the 6th resistance R6
The collector of first triode T1, the emitter ground connection of the first triode T1, the common end of the 5th resistance R5 and the 6th resistance R6
The base stage of the second triode T2 is connected, DC output end V1 is also connected with the source electrode of metal-oxide-semiconductor P1, and the drain electrode of metal-oxide-semiconductor P1 is that load is defeated
Outlet VOUT connection load, DC output end V1 are also connected with the first end of the 7th resistance R7, and the second end of the 7th resistance R7 passes through
8th resistance R8 ground connection, the grid of metal-oxide-semiconductor P1 connect the second end of the 7th resistance R7, the emitter connection of the second triode T2 the
The first end of seven resistance R7, the collector of the second triode T2 connect the second end of the 7th resistance R7, the drain electrode of metal-oxide-semiconductor P1 and ground
Between be connected in series with the 9th resistance R9 and the tenth resistance R10, the 9th resistance R9 and the tenth resistance R10 common end connection first
The base stage of triode T1, the both ends of the tenth resistance R10 are connected in parallel third capacitor C3, and load outputs VOUT passes through the second capacitor
C2 ground connection；
Specifically, the working principle of the overvoltage crowbar are as follows: when the supply voltage of temperature transducer is normal, MOS
Pipe P1 is in the conductive state, and the DC output end V1 of power circuit is that temperature transducer carries out normally by load outputs VOUT
Power supply；
If the supply voltage of temperature transducer increases suddenly, when there is overvoltage condition, overvoltage crowbar is started to work, and is broken
Metal-oxide-semiconductor P1 is opened, prevents excessive voltage from leading to the damage of temperature transducer, wherein the 9th resistance R9 and the tenth resistance R10 are used for
The voltage for acquiring load outputs VOUT, when there is over-voltage, the partial pressure value of the 9th resistance R9 and the tenth resistance R10 are greater than the one or three
The conducting voltage of pole pipe T1 base stage, the first triode T1 conducting, due to the conducting of the first triode T1, the base of the second triode T2
Pole tension is pulled low, and the second triode T2 is PNP type triode, and the second triode T2 receives low level signal conducting, due to the
The grid of the conducting of two triode T2, metal-oxide-semiconductor P1 is switched to DC output end V1, metal-oxide-semiconductor by the second triode T2 be connected
The grid voltage of P1 is raised, and metal-oxide-semiconductor P1 is PMOS tube, and metal-oxide-semiconductor P1 receives high level signal cut-off at this time, is realized and is passed to thermometric
The overvoltage protection of sensor power supply；
By the way that the second capacitor C2 is arranged in load outputs VOUT, when being just switched on power supply, the second capacitor C2 charges, when
When there is over-voltage, the second capacitor C2 can power for temperature transducer, avoid temperature transducer from stopping working because of power loss, after guarantee
Continuous work is normally carried out, and after the electricity of the second capacitor C2 is released, the partial pressure value of the 9th resistance R9 and the tenth resistance R10 will be small
In the conducting voltage of the first triode T1 base stage, the first triode T1 cut-off, due to the cut-off of the first triode T1, the two or three pole
Pipe T2 is also switched off, and metal-oxide-semiconductor P1 conducting enables DC output end V1 normally to temperature transducer normal power supply；Pass through setting second
Capacitor C2 is able to achieve the self- recoverage function of supplying power after over-voltage is eliminated, and is not necessarily to manual operation, convenient to use,
The structure of the overvoltage crowbar is simple, and electronic component is few, low in cost, and component is small in size, reduces
Circuit board accounts for plate suqare.
The power circuit includes: ACDC power supply chip ACDC, first resistor R1, second resistance R2, diode D1 and
One capacitor C1；AC power source AC is converted to DC power supply output by ACDC power supply chip ACDC, and ACDC power supply chip ACDC's is defeated
First resistor R1 and second resistance R2, the common end company of first resistor R1 and second resistance R2 are connected in series between outlet and ground
The anode of diode D1, the first end of the cathode connection first capacitor C1 of diode D1 are connect, the second end of first capacitor C1 is grounded,
The cathode of diode D1 connects DC output end V1；
Specifically, the ACDC power supply chip ACDC converts alternating current to direct current electricity output, wherein first resistor R1 and
Second resistance R2 partial pressure reduces the DC level of ACDC power supply chip ACDC output, for the lower diode of rated supply voltage
The devices such as D1, optical coupling isolator OC and voltage stabilizing chip IC1 use；First capacitor C1 provides the electricity after a more stable partial pressure
Pressure, diode D1 is for carrying out first time rectification；
Traditional battery is avoided so that AC power source can also be powered temperature transducer by setting power circuit
Power supply need to use power supply adaptor bring troublesome in poeration.
Voltage stabilizing chip IC1, the cathode of diode D1 are connected between the cathode and DC output end V1 of the diode D1
The input terminal of voltage stabilizing chip IC1 is connected, the output end of voltage stabilizing chip IC1 connects DC output end V1, the ground connection of voltage stabilizing chip IC1
End ground connection；The voltage stabilizing chip IC1 is used to carry out voltage-regulation voltage-stabilization to voltage, so that the output voltage of DC output end V1 is more steady
It is fixed, improve the electrical stability of power circuit.
The cathode of the diode D1 is also connected with the input terminal of optical coupling isolator OC, the output end connection of optical coupling isolator OC
The input terminal of voltage stabilizing chip IC1, the output end of optical coupling isolator OC also pass through the 4th resistance R4 connection external power supply VCC；It is described
Optical coupling isolator OC eliminates the interference that electrical connection generates, and reduces the voltage disturbance for being input to voltage stabilizing chip IC1, improves system
Serious forgiveness improves the anti-interference ability of power circuit.
3rd resistor R3 is also connected between the cathode of the diode D1 and the input terminal of optical coupling isolator OC；Described
Three resistance R3 are current-limiting resistance, improve the job stability and reliability of power circuit.
The chip model that the voltage stabilizing chip IC1 is used is MC78057；MC78057 is most common voltage stabilizing chip, is used
It is convenient, a D.C. regulated power supply can be exported using simple circuit.
The above content is the further descriptions made in conjunction with specific preferred embodiment to the utility model, cannot recognize
Determine specific embodiment of the present utility model to be only limited to these instructions.For the common skill of the utility model technical field
For art personnel, the other embodiments obtained in the case where not departing from the technical solution of the utility model be should be included in practical
In novel protection scope.
Claims (6)
1. a kind of contactless temperature-measuring sensor, it is characterised in that: it include: the power supply for for being electrically connected with temperature transducer, it is described
Supply coupling has power circuit, is provided with overvoltage protection electricity in the DC output end (V1) of power circuit and the power supply line of load
Road；The overvoltage crowbar includes: the 5th resistance (R5), the 6th resistance (R6), the first triode (T1), the second triode
(T2), the 7th resistance (R7), the 8th resistance (R8), metal-oxide-semiconductor (P1), the 9th resistance (R9), the tenth resistance (R10), the second capacitor
(C2) and third capacitor (C3)；
The DC output end (V1) is connected in series with the 5th resistance (R5) and the 6th resistance (R6), one end of the 6th resistance (R6)
Connect the collector of the first triode (T1), the emitter ground connection of the first triode (T1), the 5th resistance (R5) and the 6th resistance
(R6) base stage of common end connection the second triode (T2), DC output end (V1) are also connected with the source electrode of metal-oxide-semiconductor (P1), MOS
The drain electrode for managing (P1) is load outputs (VOUT) connection load, and DC output end (V1) is also connected with the first of the 7th resistance (R7)
The second end at end, the 7th resistance (R7) is grounded by the 8th resistance (R8), and the grid of metal-oxide-semiconductor (P1) connects the 7th resistance (R7)
Second end, the emitter of the second triode (T2) connect the first end of the 7th resistance (R7), the collector of the second triode (T2)
The second end of the 7th resistance (R7) is connected, the 9th resistance (R9) and the tenth are connected in series between the drain electrode and ground of metal-oxide-semiconductor (P1)
Resistance (R10), the 9th resistance (R9) connect the base stage of the first triode (T1), the tenth electricity with the common end of the tenth resistance (R10)
The both ends of resistance (R10) are connected in parallel third capacitor (C3), and load outputs (VOUT) are grounded by the second capacitor (C2).
2. a kind of contactless temperature-measuring sensor as described in claim 1, it is characterised in that: the power circuit includes:
ACDC power supply chip (ACDC), first resistor (R1), second resistance (R2), diode (D1) and first capacitor (C1)；ACDC electricity
AC power source (AC) is converted to DC power supply output, output end and the ground of ACDC power supply chip (ACDC) by source chip (ACDC)
Between be connected in series with first resistor (R1) and second resistance (R2), first resistor (R1) is connected with the common end of second resistance (R2)
The anode of diode (D1), the first end of cathode connection first capacitor (C1) of diode (D1), the second of first capacitor (C1)
The cathode of end ground connection, diode (D1) connects DC output end (V1).
3. a kind of contactless temperature-measuring sensor as claimed in claim 2, it is characterised in that: the cathode of the diode (D1)
It is connected between DC output end (V1) voltage stabilizing chip (IC1), the cathode of diode (D1) connects the defeated of voltage stabilizing chip (IC1)
Enter end, the output end of voltage stabilizing chip (IC1) connects DC output end (V1), the ground terminal ground connection of voltage stabilizing chip (IC1).
4. a kind of contactless temperature-measuring sensor as claimed in claim 3, it is characterised in that: the cathode of the diode (D1)
It is also connected with the input terminal of optical coupling isolator (OC), the output end of optical coupling isolator (OC) connects the input terminal of voltage stabilizing chip (IC1),
The output end of optical coupling isolator (OC) also passes through the 4th resistance (R4) connection external power supply (VCC).
5. a kind of contactless temperature-measuring sensor as claimed in claim 4, it is characterised in that: the cathode of the diode (D1)
3rd resistor (R3) is also connected between the input terminal of optical coupling isolator (OC).
6. a kind of contactless temperature-measuring sensor as claimed in claim 3, it is characterised in that: the voltage stabilizing chip (IC1) is adopted
Chip model is MC78057.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920123040.3U CN209541918U (en) | 2019-01-24 | 2019-01-24 | A kind of contactless temperature-measuring sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920123040.3U CN209541918U (en) | 2019-01-24 | 2019-01-24 | A kind of contactless temperature-measuring sensor |
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| Publication Number | Publication Date |
|---|---|
| CN209541918U true CN209541918U (en) | 2019-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920123040.3U Expired - Fee Related CN209541918U (en) | 2019-01-24 | 2019-01-24 | A kind of contactless temperature-measuring sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112996190A (en) * | 2021-04-15 | 2021-06-18 | 珠海美光原科技股份有限公司 | 200W LED driving power circuit |
-
2019
- 2019-01-24 CN CN201920123040.3U patent/CN209541918U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112996190A (en) * | 2021-04-15 | 2021-06-18 | 珠海美光原科技股份有限公司 | 200W LED driving power circuit |
| CN112996190B (en) * | 2021-04-15 | 2022-03-15 | 珠海美光原科技股份有限公司 | 200W LED driving power circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191025 Termination date: 20210124 |
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| CF01 | Termination of patent right due to non-payment of annual fee |