Temperature sensor circuit, temperature sensor, PCB and drainage device for vehicle drainage valve

Abstract

The utility model discloses a temperature sensor circuit of a vehicle drainage valve, a temperature sensor, a PCB and a drainage device, the circuit comprises an anti-reverse unit and a voltage stabilization filtering unit which are connected in sequence, a DC voltage power supply pin is connected with the voltage stabilization filtering unit, one end of a resistor R1, one end of an NTC thermistor R10, one end of an R4 and a V + pin of an operational amplifier U2; the IN + pin of the operational amplifier U2 is connected with the other end of the resistor R1, one end of R6, one end of R3 and one end of a capacitor C7; the IN-pin of the operational amplifier U2 is connected with the other end of the NTC thermistor R10, one end of the capacitor C1 and one end of the R11; an OUT pin of the operational amplifier U2 is connected with the other end of the R4, the other end of the R6 and one end of the R2; the other end of the R2 is connected with the base electrode of the triode Q1, and the collector electrode of the triode Q1 is connected with the anode of the diode D1 and one end of the capacitor C5. According to the utility model, the temperature sensor circuit suitable for the vehicle drain valve is realized, and the heater of the vehicle drain valve can be automatically switched on and off.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle drainage technical field, concretely relates to temperature sensor circuit, temperature sensor, PCB board and drainage device for vehicle drainage valve. BACKGROUND

[0002] The brake system of the vehicle is usually mainly air brake, and condensate water is generated during the operation, and the water vapor is more and more over time, so that the drainage valve is needed to drain water. For the northern region, the winter temperature can cause the drainage valve pipeline to freeze and affect the drainage problem, so in order to avoid freezing, the drainage valve needs to be heated, and the heater usually adopts the PTC heater, but there is a lack of a temperature sensor for heating service for the vehicle drainage valve. In view of this, it is necessary to provide a temperature sensor circuit for the vehicle drainage valve. SUMMARY

[0003] The utility model aims at providing a kind of temperature sensor circuit suitable for vehicle drainage valve heater.

[0004] First, the utility model provides a kind of temperature sensor circuit for vehicle drainage valve, including anti-reverse unit, voltage stabilizing filter unit, the anti-reverse unit one end is connected with power supply pin POW, voltage stabilizing filter unit one end is connected with the other end of anti-reverse unit, connects input signal voltage pin, diode D1 negative pole, for connecting heater anode;Voltage stabilizing filter unit connects direct current voltage power supply pin, the direct current voltage power supply pin connects one end of resistance R1, one end of NTC thermistor R10, one end of resistance R4, the V+ pin of operational amplifier U2;The IN+ pin of operational amplifier U2 is connected with the other end of resistance R1, one end of positive feedback resistance R6, one end of resistance R3, one end of capacitor C7;The IN- pin of operational amplifier U2 is connected with the other end of NTC thermistor R10, one end of capacitor C1 and one end of resistance R11;The OUT pin of operational amplifier U2 is connected with the other end of resistance R4, the other end of positive feedback resistance R6, one end of resistance R2;The other end of resistance R2 is connected with the base of triode Q1, the collector of triode Q1 is connected with diode D1 anode, one end of capacitor C5 and for connecting heater negative pole;Voltage stabilizing filter unit other end, the V- pin of operational amplifier U2, the other end of resistance R3, the other end of capacitor C7, the other end of capacitor C1, the other end of resistance R11, the emitter of triode Q1, the other end of capacitor C5 are all grounded.

[0005] In a preferred embodiment, the anti-reverse unit adopts Schottky diode D2, the anode of Schottky diode D2 is connected with power supply pin POW to obtain voltage VCC, and the cathode of Schottky diode D2 is connected with one end of voltage stabilizing filter unit.

[0006] In a preferred embodiment, the voltage stabilizing filter unit comprises a parallel resistance component, a capacitor C17, a diode D10 and a capacitor C4; one end of the parallel resistance component is connected to the negative electrode of the Schottky diode D2, the negative electrode of the diode D1, the input signal voltage pin and the positive electrode of the heater; one end of the capacitor C17, one end of the diode D10 and one end of the capacitor C4 are all connected to the other end of the parallel resistance component and the DC voltage supply pin, and the other end of the capacitor C17, the other end of the diode D10 and the other end of the capacitor C4 are all grounded.

[0007] In a preferred embodiment, the parallel resistance component comprises resistors R7, R5, R8 and R9 connected in parallel.

[0008] In a preferred embodiment, the resistor R7 is an NC resistor, and the resistors R5, R8 and R9 are fixed resistors with the same resistance value.

[0009] In a preferred embodiment, the triode Q1 is an NPN field effect tube.

[0010] In a second aspect, the utility model provides a kind of temperature sensor, it includes the temperature sensor circuit for vehicle drain valve described in the first aspect and its preferred embodiment.

[0011] In a third aspect, the utility model provides a kind of PCB board, characterized in that, comprising PCB substrate, the first aspect and its preferred embodiment are described on the PCB substrate The temperature sensor circuit for vehicle drain valve.

[0012] In a preferred embodiment, the PCB board is provided with a first metallized hole for connecting the positive electrode of the heater, a second metallized hole for connecting the negative electrode of the heater, a third metallized hole for grounding, and a fourth metallized hole for serving as a power supply pin POW.

[0013] The utility model further provides a condensate water drainage device for air brake vehicle, which comprises a drain valve arranged on an automobile brake system, a heater arranged on the drain valve, and a PCB board electrically connected to the heater, wherein the PCB board is a PCB board as described in the third aspect and its preferred embodiments.

[0014] Compared with the prior art, the utility model provides temperature sensor circuit, PCB board and drainage device for vehicle drainage valve, the utility model discloses through preventing reverse unit and voltage stabilizing filter unit to get stable power supply, through NTC thermistor R10, operational amplifier U2, positive feedback resistance R6 etc. Element, the change of temperature is embodied to the output of operational amplifier U2, based on operational amplifier U2 and triode Q1 etc. Element, realize the output of operational amplifier U2 whether triode Q1 is turned on, and further realize whether it is turned on, such design, realize a kind of temperature sensor circuit suitable for vehicle drainage valve, can be used to realize the switch of vehicle drainage valve heater, fill the blank of prior art. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the drawings needed to be used in the embodiment will be briefly introduced below.

[0016] Figure 1 The circuit diagram of the temperature sensor circuit provided by the utility model is provided.

[0017] Figure 2 The position layout schematic diagram of the temperature sensor circuit provided by the utility model on the PCB board is provided. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and beneficial technical effect of the utility model more clearly, the following will be further detailed to the utility model by combining with the drawings and specific embodiment. It should be understood that the specific embodiment described in the specification is only for explaining the utility model, and is not for limiting the utility model.

[0019] In the embodiment of the utility model, the temperature sensor circuit for vehicle drainage valve is provided.

[0020] Please refer to Figure 1 , including power supply processing module and Schmidt trigger module based on NTC thermistor R10, power supply processing module is used for connecting power supply pin POW, power supply processing module connects Schmidt trigger module, and power supply processing module is used for power supply for Schmidt trigger module. Power supply processing module and Schmidt trigger module are all externally connected with the heater, and the Schmidt trigger module realizes the temperature sensing for vehicle drainage valve. The Schmidt trigger module is based on the resistance value of NTC thermistor R10. The Schmidt trigger module determines the signal output by the signal output end according to the voltage / current corresponding to the resistance value of NTC thermistor R10, and the signal output end of the Schmidt trigger module is externally connected with the heater. It can be understood that the heater is the heater of the vehicle drainage valve, and the heater is the drainage valve pipeline heating.

[0021] Specifically, the heater adopts a PTC heater, the power supply processing module is connected to the positive pole of the PTC heater, and the Schmitt trigger module is connected to the negative pole of the PTC heater.

[0022] In this embodiment, the power supply processing module comprises an anti-reverse unit and a voltage stabilizing filter unit. The device of the Schmitt trigger module comprises a capacitor C1, a resistor R11, a resistor R1, an NTC thermistor R10, a resistor R3, a capacitor C7, an operational amplifier U2, a positive feedback resistor R6, a resistor R4, a resistor R2, a triode Q1, a capacitor C5, and a diode D1.

[0023] One end of the anti-reverse unit is connected to a power supply pin POW, one end of the voltage stabilizing filter unit is connected to the other end of the anti-reverse unit, connected to an input signal voltage pin (VI pin), a negative pole of the diode D1, and used for connecting a positive pole of the heater; the other end of the voltage stabilizing filter unit is grounded; the voltage stabilizing filter unit is connected to a direct current voltage supply pin (for example, used for connecting a 5V voltage), the direct current voltage supply pin is connected to one end of the resistor R1, one end of the NTC thermistor R10, one end of the resistor R4, and a V+ pin of the operational amplifier U2; a V- pin of the operational amplifier U2 is grounded; an IN+ pin of the operational amplifier U2 is connected to the other end of the resistor R1, one end of the positive feedback resistor R6, one end of the resistor R3, and one end of the capacitor C7; an IN- pin of the operational amplifier U2 is connected to the other end of the NTC thermistor R10, one end of the capacitor C1, and one end of the resistor R11; the other end of the resistor R3, the other end of the capacitor C7, the other end of the capacitor C1, and the other end of the resistor R11 are connected and grounded; an OUT pin of the operational amplifier U2 is connected to the other end of the resistor R4, the other end of the positive feedback resistor R6, and one end of the resistor R2; the other end of the resistor R2 is connected to a base of the triode Q1, and a collector of the triode Q1 is connected to a positive pole of the diode D1, one end of the capacitor C5, and used for connecting a negative pole of the heater.

[0024] Here, the anti-reverse unit adopts a Schottky diode D2, a positive pole of the Schottky diode D2 is connected to a power supply pin POW to obtain a voltage VCC, and a negative pole of the Schottky diode D2 is connected to one end of the voltage stabilizing filter unit.

[0025] In this embodiment, the voltage stabilizing filter unit comprises a parallel resistance component, a capacitor C17, a diode D10 and a capacitor C4; the capacitor C17, the diode D10 and the capacitor C4 are connected in parallel. One end of the parallel resistance component is connected to the negative electrode of the Schottky diode D2, the negative electrode of the diode D1 and the input signal voltage pin, and the other end of the parallel resistance component is connected to the positive electrode of the heater; that is, one end of the parallel resistance component is connected to the diode D1, and the parallel resistance component and the diode D1 are connected to the same input signal voltage network. One end of the capacitor C17, one end of the diode D10 and one end of the capacitor C4 are all connected to the other end of the parallel resistance component and the DC voltage supply pin, and the other end of the capacitor C17, the other end of the diode D10 and the other end of the capacitor C4 are connected and grounded; that is, one end of the capacitor C17, one end of the diode D1, one end of the capacitor C4, one end of the resistor R1, one end of the NTC thermistor R10, one end of the resistor R4 and the V+ pin of the operational amplifier U2 are all connected to the same network and the DC voltage supply pin, serving as an example. The DC voltage supply pin corresponds to a 5V DC supply voltage.

[0026] The parallel resistance component comprises the resistor R7, the resistor R5, the resistor R8 and the resistor R9 connected in parallel, forming a four-way parallel circuit. As a specific embodiment, the resistor R7 is an NC resistor, and the resistor R5, the resistor R8 and the resistor R9 are all fixed resistors with the same resistance value, for example, 3KΩ.

[0027] In this embodiment, the Schottky diode D2 is used as a reverse prevention diode, and the type of the Schottky diode is SS54. The capacitor C17 is a small-capacity capacitor (for example, 10μF, 50V) corresponding to high-frequency filtering, and the capacitor C4 is a large-capacity capacitor (for example, 10 5 μF) corresponding to low-frequency filtering. The diode D10 can be an 18V stabilizing diode.

[0028] In this embodiment, the capacitor C1 and the capacitor C7 are both 10 5 μF capacitors, the resistance value of the resistor R11 is 9.53KΩ, the resistance value of the resistor R1 is 18KΩ, the resistance value of the resistor R3 is 10KΩ, the resistance value of the positive feedback resistor R6 is 20KΩ, the resistance value of the resistor R4 is 10KΩ, the resistance value of the resistor R2 is 10KΩ, the capacitor C5 is a 10 4 μF capacitor, the type of the triode Q1 is 5N10-MS, and the type of the diode D1 is 1N4007W.

[0029] The working principle of the temperature sensor circuit of the embodiment is as follows: after the voltage VCC is filtered and stabilized, the voltage VCC is used as the power supply of the Schmitt trigger module, the Schmitt trigger is realized according to the NTC characteristic, and the Schmitt trigger cooperates with the transistor to control the opening and closing of the heater. Specifically, according to the characteristic of the NTC thermistor R10 (the higher the temperature, the smaller the resistance value; the lower the temperature, the greater the resistance value), the voltage comparison of the IN- pin and the IN+ pin of the operational amplifier U2 is caused, and the output of the OUT pin of the operational amplifier U2 is opened if the comparison result reaches the set point. Based on the temperature change of the environment where the NTC thermistor R10 is located, the output of the operational amplifier U2 is determined, that is, the opening and closing of the heater are not at the same point. If a high level is output to the transistor Q1, the transistor Q1 is turned on, and the PTC heater is turned on. If a low level is output to the transistor Q1, the transistor Q1 does not output, and the PTC heater is turned off. As an example, when the resistance value of the NTC thermistor R10 is 10K, the heater starts to heat the vehicle drain valve. When the resistance value of the NTC thermistor R10 is 5K, the heater is turned off, and the heater stops heating the vehicle drain valve.

[0030] It can be seen from the above detailed description of the specific embodiments of the utility model that the utility model obtains stable power supply through the anti-reverse unit and the voltage stabilizing filter unit. The temperature change is reflected to the output of the operational amplifier U2 through the NTC thermistor R10, the operational amplifier U2 and the positive feedback resistor R6 and the like. Based on the operational amplifier U2 and the transistor Q1 and the like, it is realized that whether the output of the operational amplifier U2 is reflected to the conduction of the transistor Q1, and then whether the circuit and the heater are conducted. Based on the utility model, a temperature sensor circuit suitable for a vehicle drain valve is realized, which can realize the opening and closing of the vehicle drain valve heater and fill the gap in the prior art.

[0031] The utility model also provides a temperature sensor which contains the temperature sensor circuit for vehicle drain valve. It can be understood that the temperature sensor can output a switching signal according to the temperature through the temperature sensor circuit, realize temperature sensing, be used for the temperature sensing element of the vehicle drain valve, and then can realize the opening and closing of the vehicle drain valve heater and fill the gap in the prior art.

[0032] Please refer to Figure 2 The utility model also provides a PCB, which comprises a PCB substrate, and the PCB substrate is provided with the temperature sensor circuit for vehicle drain valve. The layout positions of various devices on the PCB are shown in Figure 2 It can be understood that the PCB can automatically open and close the heater according to the ambient temperature after the temperature sensor circuit is used, and can be applied to the field of drain valve anti-icing of vehicle braking systems.

[0033] Specifically, please refer toFigure 2 The PCB board is provided with a first metalized hole (see Figure 2 PTC+) for connecting the positive pole of the heater, a second metalized hole (see Figure 2 PTC-) for connecting the negative pole of the heater, a third metalized hole (see Figure 2 GND) for grounding, and a fourth metalized hole (see Figure 2 VCC) for serving as a power supply pin POW.

[0034] Based on the design of the temperature sensor circuit, the PCB board of the embodiment has the advantages of small volume and thin thickness, and is suitable for a vehicle drain valve.

[0035] The utility model also provides air brake vehicle condensate water drainage device, and this device includes setting up on the automobile brake system drainage valve, setting up on the drainage valve (pipeline) heater, electric connection heater the PCB board. Specifically, the heater can adopt PTC heater. This air brake vehicle condensate water drainage device can realize automatic switch heater according to ambient temperature, realize automatic heating and automatic cancel heating to drainage valve, avoid the occurrence of drainage valve pipeline icing condition, avoid the problem of causing drainage valve pipeline icing and further influence drainage in cold environment.

[0036] The above is only the embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process conversion using the utility model specification and drawing contents, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A temperature sensor circuit for a vehicle drain valve, characterized in that, The system includes an anti-reverse unit and a voltage regulator / filter unit. One end of the anti-reverse unit is connected to the power supply pin (POW). One end of the voltage regulator / filter unit is connected to the other end of the anti-reverse unit, the input signal voltage pin, the negative terminal of diode D1, and is used to connect to the positive terminal of the heater. The voltage regulator / filter unit is connected to a DC voltage power supply pin, which is connected to one end of resistor R1, one end of NTC thermistor R10, one end of resistor R4, and the V+ pin of operational amplifier U2. The IN+ pin of operational amplifier U2 is connected to the other end of resistor R1, one end of positive feedback resistor R6, one end of resistor R3, and one end of capacitor C7. The IN- pin of operational amplifier U2... Connect the other end of NTC thermistor R10, one end of capacitor C1, and one end of resistor R11; connect the OUT pin of operational amplifier U2 to the other end of resistor R4, the other end of positive feedback resistor R6, and one end of resistor R2; connect the other end of resistor R2 to the base of transistor Q1, connect the collector of transistor Q1 to the positive terminal of diode D1, one end of capacitor C5, and connect to the negative terminal of heater; ground the other end of the voltage regulator filter unit, the V- pin of operational amplifier U2, the other end of resistor R3, the other end of capacitor C7, the other end of capacitor C1, the other end of resistor R11, the emitter of transistor Q1, and the other end of capacitor C5.

2. The temperature sensor circuit for a vehicle drain valve as described in claim 1, characterized in that, The anti-reverse unit uses a Schottky diode D2. The positive terminal of the Schottky diode D2 is connected to the power supply pin POW to obtain the voltage VCC, and the negative terminal of the Schottky diode D2 is connected to one end of the voltage regulation and filtering unit.

3. The temperature sensor circuit for a vehicle drain valve as described in claim 2, characterized in that, The voltage stabilizing and filtering unit includes a parallel resistor assembly, a capacitor C17, a diode D10, and a capacitor C4. One end of the parallel resistor assembly is connected to the negative terminal of Schottky diode D2, the negative terminal of diode D1, and the input signal voltage pin, and is used to connect to the positive terminal of the heater. One end of capacitor C17, one end of diode D10, and one end of capacitor C4 are all connected to the other end of the parallel resistor assembly and to the DC voltage power supply pin. The other ends of capacitor C17, diode D10, and capacitor C4 are all grounded.

4. A temperature sensor circuit for a vehicle drain valve as described in claim 3, characterized in that, The parallel resistor assembly includes resistors R7, R5, R8, and R9 connected in parallel.

5. A temperature sensor circuit for a vehicle drain valve as described in claim 4, characterized in that, The resistor R7 is an NC resistor, and the resistors R5, R8 and R9 are all fixed resistors with the same resistance value.

6. A temperature sensor circuit for a vehicle drain valve as described in claim 1, characterized in that, The transistor Q1 is an NPN field-effect transistor.

7. A temperature sensor, characterized in that, It includes a temperature sensor circuit for a vehicle drain valve as described in any one of claims 1-6.

8. A PCB board, characterized in that, The device includes a PCB substrate, on which a temperature sensor circuit for a vehicle drain valve as described in any one of claims 1-6 is provided.

9. A PCB board as described in claim 8, characterized in that, The PCB board is provided with a first metallized hole for connecting the positive electrode of the heater, a second metallized hole for connecting the negative electrode of the heater, a third metallized hole for grounding, and a fourth metallized hole for serving as the power supply pin POW.

10. A drainage device, characterized in that, It includes a drain valve installed on the vehicle braking system, a heater installed on the drain valve, and a PCB board electrically connected to the heater, wherein the PCB board is a PCB board as described in claim 8 or 9.

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