A high-pressure water heating PTC control device

Abstract

A high-pressure water heating PTC control device includes a PTC heating unit and a temperature collection unit for detecting the temperature of the medium of the PTC heating unit, and also includes a relay drive unit; the PTC heating unit includes a PTC load, a first relay and a second relay, and the relay drive unit includes a first relay drive unit and a second relay drive unit; the PTC load, the contact of the first relay and the contact of the second relay are connected in series to form a first circuit, one end of the first circuit is connected to a power supply signal, and the other end is grounded; the output end of the first relay drive unit is connected to the coil of the first relay, and the input end of the first relay drive unit is connected to a control switch; the output end of the second relay drive unit is connected to the coil of the second relay, and the output end of the temperature collection unit is connected to the input end of the second relay drive unit. The utility model can effectively prevent the product from overheating due to dry burning.

Description

Technical Field

[0001] The utility model relates to the field of PTC control, in particular to a high-pressure water heating PTC control device. Background Art

[0002] Traditional PTC has the following two major pain points: 1. If the power device in the heating circuit of traditional PTC is short-circuited, PTC cannot be controlled, which may cause dry burning of the product. 2. Traditional PTC is not compatible with the low-voltage 12V and 24V systems of the whole vehicle. Therefore, a safe, compatible and reliable PTC control strategy is urgently needed. Utility Model Content

[0003] In view of the technical defects and technical drawbacks in the prior art, the embodiment of the utility model provides a high-pressure water heating PTC control device that overcomes the above problems or at least partially solves the above problems. The specific solution is as follows:

[0004] A high-pressure water-heating PTC control device comprises a PTC heating unit and a temperature collection unit for detecting the temperature of a medium in the PTC heating unit, and also comprises a relay driving unit; the PTC heating unit comprises a PTC load, a first relay and a second relay, and the relay driving unit comprises a first relay driving unit and a second relay driving unit; the PTC load, the contacts of the first relay and the contacts of the second relay are connected in series to form a first circuit, one end of the first circuit is connected to a power supply signal, and the other end is grounded; the output end of the first relay driving unit is connected to the coil of the first relay, and the input end of the first relay driving unit is connected to a control switch; the output end of the second relay driving unit is connected to the coil of the second relay, and the output end of the temperature collection unit is connected to the input end of the second relay driving unit.

[0005] Furthermore, the PTC heating unit also includes an overload protection circuit, and the overload protection circuit is connected in series to the first circuit.

[0006] Furthermore, the overload protection circuit is a fuse.

[0007] Furthermore, the first relay driving unit includes a first optocoupler, a resistor R3 and a resistor R4, the positive electrode of the first optocoupler is connected to the first voltage signal through the control switch and the resistor R3 in sequence, and the negative electrode is grounded; the collector of the first optocoupler is connected to one end of the first relay coil, the other end of the first relay coil is connected to the first voltage signal, the collector of the first optocoupler is also connected to the first voltage signal through the resistor R4, and the emitter of the first optocoupler is grounded.

[0008] Furthermore, the device further comprises a capacitor C8 and a diode Z2, wherein the capacitor C8 and the diode Z2 are connected in parallel to form a third circuit, and two ends of the third circuit are respectively connected to two ends of the first relay coil.

[0009] Furthermore, the second relay driving unit includes a second optocoupler, a resistor R7 and a resistor R8, the cathode of the second optocoupler is connected to the output end of the temperature acquisition unit, the anode is connected to the second voltage signal through the resistor R7, the cathode of the second optocoupler is also connected to the second voltage signal through the resistor R8, the collector of the second optocoupler is connected to one end of the second relay coil, and the emitter of the second optocoupler is connected to the other end of the second relay coil.

[0010] Furthermore, the device further comprises a capacitor C7 and a diode Z3, wherein the capacitor C7 and the diode Z3 are connected in parallel to form a fourth circuit, and two ends of the fourth circuit are respectively connected to two ends of the second relay coil.

[0011] Furthermore, the temperature acquisition unit is an NTC temperature sensor, one end of the NTC temperature sensor is connected to the input end of the second relay driving unit, and is also connected to the second voltage signal through the resistor R1, and the other end of the NTC temperature sensor is grounded.

[0012] Furthermore, the device also includes a low-voltage power supply circuit, which includes a K7805-2000R3 chip, an IB0505S-W75R3 chip, a capacitor C2, a capacitor C3, a capacitor C6 and a diode Z1. The Vin pin of the K7805-2000R3 chip is connected to a vehicle-mounted 12V or 24V voltage signal through a diode Z1, and the Vout pin outputs a second voltage signal. The Vout pin of the K7805-2000R3 chip is also connected to the Vin pin of the IB0505S-W75R3 chip. -The +VO pin of the W75R3 chip outputs a first voltage signal; the GND pins of the K7805-2000R3 chip and the IB0505S-W75R3 chip are grounded, a capacitor C3 is connected between the Vin pin of the K7805-2000R3 chip and the ground, and a capacitor C6 is connected between the Vout pin of the K7805-2000R3 chip and the ground; the 0V pin of the IB0505S-W75R3 chip is grounded, and a capacitor C2 is connected between the +VO pin of the IB0505S-W75R3 chip and the ground.

[0013] Further, the PTC load includes a PTC load A and a PTC load B, the first relay drive unit includes a first relay drive unit A and a first relay drive unit B, the first relay includes a first relay A and a first relay B, the PTC load A and the PTC load B are connected in parallel, the PTC load A, the contacts of the first relay A and the contacts of the second relay are connected in series to form a first circuit A, the PTC load A, the contacts of the first relay A and the contacts of the second relay are connected in series to form a first circuit B, the output end of the first relay drive unit A is connected to the coil of the first relay A, and the output end of the first relay drive unit B is connected to the coil of the first relay B.

[0014] The utility model has the following beneficial effects:

[0015] This utility model product solution adopts K7805-2000R3 power chip, the input voltage meets (8-36VDC), and is compatible with 12VDC and 24VDC systems on the whole vehicle; the bus input of the product is designed with a fuse. When a large current occurs, the fuse will blow and effectively protect the subsequent electronic components to prevent the product from burning dry. At the same time, the product is designed with a hardware overheating protection circuit. When the temperature of the detected medium is too high, it can drive the relay (RE6) to disconnect, which can effectively prevent the product from burning dry and overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a structural block diagram of a high-pressure water heating PTC control device provided in an embodiment of the utility model.

[0018] Figure 2 A circuit schematic diagram of a high-pressure water heating PTC control device provided by an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of a low voltage power supply circuit provided for an embodiment of the utility model;

[0020] Figure 4 A circuit schematic diagram of another high-pressure water heating PTC control device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present utility model, unless otherwise specified, "multiple" and "several" mean two or more.

[0023] refer to Figure 1 As shown, a high-pressure water heating PTC control device provided by an embodiment of the utility model includes a PTC heating unit and a temperature acquisition unit for detecting the medium temperature of the PTC heating unit, and also includes a relay drive unit; the PTC heating unit includes a PTC load, a first relay and a second relay, and the relay drive unit includes a first relay drive unit and a second relay drive unit; the PTC load, the contacts of the first relay and the contacts of the second relay are connected in series to form a first circuit, one end of the first circuit is connected to a power supply signal, and the other end is grounded; the output end of the first relay drive unit is connected to the coil of the first relay, and the input end of the first relay drive unit is connected to a control switch; the output end of the second relay drive unit is connected to the coil of the second relay, and the output end of the temperature acquisition unit is connected to the input end of the second relay drive unit.

[0024] The PTC heating unit further comprises an overload protection circuit, which is connected in series to the first circuit. The overload protection circuit is preferably a fuse F1.

[0025] A fuse is designed on the bus input of the product. When a large current occurs, the fuse will blow and effectively protect the subsequent electronic components to prevent the product from burning out.

[0026] In the above embodiment, the on and off of the coil of the first relay is controlled by the first relay driving unit, and the contact of the first relay is controlled to be closed or disconnected by the on and off of the coil of the first relay, and the on and off of the coil of the second relay is controlled by the second relay driving unit, and the contact of the second relay is controlled to be closed or disconnected by the on and off of the coil of the second relay, and the product is controlled to be prevented from overheating by the closing or disconnection of the contacts, wherein the impedance of the temperature acquisition unit changes with the increase of the medium temperature of the PTC heating unit, thereby causing the voltage signal output to the second relay driving unit to change, and the second relay driving unit controls the output voltage signal based on the change of the input voltage signal, thereby controlling the on and off of the coil of the second relay.

[0027] Preferably, reference Figure 2 As shown, the first relay driving unit includes a first optical coupler IC1, a resistor R3 and a resistor R4, the positive electrode of the first optical coupler IC1 is connected to the first voltage signal 5V-2 through the control switch SW1 and the resistor R3 in turn, and the negative electrode is grounded; the collector of the first optical coupler IC1 is connected to one end of the first relay coil, the other end of the first relay coil is connected to the first voltage signal 5V-2, and the collector of the first optical coupler IC1 is also connected to the first voltage signal through the resistor R4. Wherein, the first relay also includes a capacitor C8 and a diode Z2, the capacitor C8 and the diode Z2 are connected in parallel to form a third circuit, and the two ends of the third circuit are respectively connected to the two ends of the first relay coil.

[0028] Wherein, the second relay driving unit includes a second optical coupler IC3, a resistor R7 and a resistor R8, the cathode of the second optical coupler IC3 is connected to the output end of the temperature acquisition unit, the anode is connected to the second voltage signal 5V-1 through the resistor R7, the cathode of the second optical coupler IC3 is also connected to the second voltage signal 5V-1 through the resistor R8, the collector of the second optical coupler IC3 is connected to one end of the second relay coil, and the emitter of the second optical coupler is connected to the other end of the second relay coil. Wherein, the second relay also includes a capacitor C7 and a diode Z3, the capacitor C7 and the diode Z3 are connected in parallel to form a fourth circuit, and the two ends of the fourth circuit are respectively connected to the two ends of the second relay coil. Wherein, the temperature acquisition unit is an NTC temperature sensor, one end of the NTC temperature sensor is connected to the cathode WK1 of the second optical coupler IC3 of the second relay driving unit, and is also connected to the second voltage signal 5V-1 through the resistor R1, and the other end of the NTC temperature sensor is grounded, wherein, measuring the medium temperature of the PTC heating unit by the NTC temperature sensor is a conventional technical means in the art.

[0029] In the above embodiment, when the switch SW1 is controlled, the corresponding first optical coupler IC1 is actuated, so that the coil voltage of the first relay changes from 5V to 0V, the corresponding contact RE7 is energized, and the high voltage electricity forms a heating circuit through the PTC load to achieve the purpose of heating. As the temperature of the medium of the PTC heating unit increases, the resistance of the NTC temperature sensor becomes smaller and smaller, causing the voltage at the output terminal WK1 of the NTC temperature sensor to gradually decrease until the second optical coupler IC3 is actuated, so that the voltage of the second relay changes from 0V to 5V, and then the second relay contact RE6 is disconnected. At this time, the power supply on the bus is cut off, and the PTC load immediately stops heating.

[0030] As shown in Reference 3, preferably, the device further includes a low-voltage power supply circuit, the low-voltage power supply circuit includes a K7805-2000R3 chip, an IB0505S-W75R3 chip, a capacitor C2, a capacitor C3, a capacitor C6 and a diode Z1, the Vin pin of the K7805-2000R3 chip is connected to a vehicle-mounted 12V or 24V voltage signal through a diode Z1, and the Vout pin outputs a second voltage signal, the Vout pin of the K7805-2000R3 chip is also connected to the Vin pin of the IB0505S-W75R3 chip, and the IB05 The +VO pin of the K7805-2000R3 chip outputs a first voltage signal; the GND pins of the K7805-2000R3 chip and the IB0505S-W75R3 chip are connected to the ground, a capacitor C3 is connected between the Vin pin of the K7805-2000R3 chip and the ground, a capacitor C6 is connected between the Vout pin of the K7805-2000R3 chip and the ground; the 0V pin of the IB0505S-W75R3 chip is connected to the ground, a capacitor C2 is connected between the +VO pin of the IB0505S-W75R3 chip and the ground.

[0031] The utility model adopts K7805-2000R3 power chip, the input voltage meets (8-36VDC), and is compatible with 12VDC and 24VDC systems on the whole vehicle.

[0032] Preferably, the utility model divides the PTC load into two groups, namely PTC load A and PTC load B, and correspondingly, the first relay drive unit and the first relay are also two, wherein the first relay drive unit includes a first relay drive unit A and a first relay drive unit B, the first relay includes a first relay A and a first relay B, the PTC load A and the PTC load B are connected in parallel, the PTC load A, the contacts of the first relay A and the contacts of the second relay are connected in series to form a first circuit A, the PTC load A, the contacts of the first relay A and the contacts of the second relay are connected in series to form a first circuit B, the output end of the first relay drive unit A is connected to the coil of the first relay A, and the output end of the first relay drive unit B is connected to the coil of the first relay B.

[0033] refer to Figure 4 As shown, the PTC load A is composed of PTC13 and PTC14 in parallel, and the PTC load B is composed of PTC15, PTC16, PTC17 and PTC18, wherein the first relay drive unit A includes a first optical coupler IC1, a resistor R3 and a resistor R4, the positive electrode of the first optical coupler IC1 is connected to the first voltage signal 5V-2 through the control switch SW1 and the resistor R3 in sequence, and the negative electrode is grounded; the collector of the first optical coupler IC1 is connected to one end of the coil of the first relay A, as shown in FIG. Figure 4 The signal RL2- shown in the figure, the other end of the first relay A coil is connected to the first voltage signal 5V-2, and the collector of the first optical coupler IC1 is also connected to the first voltage signal through the resistor R4. The first relay driving unit B includes a first optical coupler IC2, a resistor R5 and a resistor R6. The positive electrode of the first optical coupler IC2 is connected to the first voltage signal 5V-2 through the control switch SW2 and the resistor R5 in turn, and the negative electrode is grounded; the collector of the first optical coupler IC2 is connected to one end of the first relay B coil, as shown in the figure. Figure 4 The signal RL3- is shown in FIG. 1 , the other end of the coil of the first relay B is connected to the first voltage signal 5V-2, and the collector of the first optical coupler IC2 is also connected to the first voltage signal through the resistor R6.

[0034] The working principle of the utility model is as follows: when the PTC detects that the medium temperature is low, the control button SW1 / SW2 is pressed, and the corresponding optocoupler IC1 / IC2 is activated, so that the voltage of the relay control terminal RL2- / RL3- changes from 5V to 0V, and the relay contact RE7 / RE8 is energized; the high voltage electricity forms a heating circuit through the load to achieve the purpose of heating. As the temperature of the PTC medium increases, the resistance of the NTC temperature sensor becomes smaller and smaller, causing the voltage at WK1 to gradually decrease; until the optocoupler IC3 is activated, the voltage of the relay RL1- changes from 0V to 5V, and then the relay contact RE6 is disconnected, at which time the power supply on the bus is cut off, and the PTC stops heating immediately.

[0035] It should be noted that the scheme for which protection is requested in the present utility model is about the selection and connection relationship of various hardware devices, and when a person skilled in the art learns about the hardware scheme of the present application, he can obtain the corresponding upper-level program or calculation formula without any objection, so the scheme for which protection is requested in the present application does not involve program improvement.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-pressure water heating PTC control device, comprising a PTC heating unit and a temperature acquisition unit for detecting the temperature of a medium in the PTC heating unit, characterized in that: It also includes a relay drive unit; the PTC heating unit includes a PTC load, a first relay and a second relay, and the relay drive unit includes a first relay drive unit and a second relay drive unit; the PTC load, the contacts of the first relay and the contacts of the second relay are connected in series to form a first circuit, one end of the first circuit is connected to a power supply signal, and the other end is grounded; the output end of the first relay drive unit is connected to the coil of the first relay, and the input end of the first relay drive unit is connected to a control switch; the output end of the second relay drive unit is connected to the coil of the second relay, and the output end of the temperature acquisition unit is connected to the input end of the second relay drive unit.

2. The high-pressure water heating PTC control device according to claim 1 is characterized in that: The PTC heating unit further comprises an overload protection circuit, which is connected in series to the first circuit.

3. The high-pressure water heating PTC control device according to claim 2, characterized in that: The overload protection circuit is a fuse.

4. The high-pressure water heating PTC control device according to claim 1, characterized in that: The first relay driving unit includes a first optical coupler, a resistor R3 and a resistor R4, the positive electrode of the first optical coupler is connected to the first voltage signal through the control switch and the resistor R3 in sequence, and the negative electrode is grounded; the collector of the first optical coupler is connected to one end of the first relay coil, the other end of the first relay coil is connected to the first voltage signal, the collector of the first optical coupler is also connected to the first voltage signal through the resistor R4, and the emitter of the first optical coupler is grounded.

5. The high-pressure water heating PTC control device according to claim 1, characterized in that: The first relay further includes a capacitor C8 and a diode Z2. The capacitor C8 and the diode Z2 are connected in parallel to form a third circuit. Two ends of the third circuit are respectively connected to two ends of the first relay coil.

6. The high-pressure water heating PTC control device according to claim 1, characterized in that: The second relay driving unit includes a second optical coupler, a resistor R7 and a resistor R8, the cathode of the second optical coupler is connected to the output end of the temperature acquisition unit, the anode is connected to the second voltage signal through the resistor R7, the cathode of the second optical coupler is also connected to the second voltage signal through the resistor R8, the collector of the second optical coupler is connected to one end of the second relay coil, and the emitter of the second optical coupler is connected to the other end of the second relay coil.

7. The high-pressure water heating PTC control device according to claim 1, characterized in that: The second relay further includes a capacitor C7 and a diode Z3. The capacitor C7 and the diode Z3 are connected in parallel to form a fourth circuit. Two ends of the fourth circuit are respectively connected to two ends of the second relay coil.

8. The high-pressure water heating PTC control device according to claim 1, characterized in that: The temperature acquisition unit is an NTC temperature sensor, one end of the NTC temperature sensor is connected to the input end of the second relay driving unit, and is also connected to the second voltage signal through the resistor R1, and the other end of the NTC temperature sensor is grounded.

9. The high-pressure water heating PTC control device according to claim 1, characterized in that: The device also includes a low-voltage power supply circuit, which includes a K7805-2000R3 chip, an IB0505S-W75R3 chip, a capacitor C2, a capacitor C3, a capacitor C6 and a diode Z1. The Vin pin of the K7805-2000R3 chip is connected to a vehicle-mounted 12V or 24V voltage signal through the diode Z1, and the Vout pin outputs a second voltage signal. The Vout pin of the K7805-2000R3 chip is also connected to the Vin pin of the IB0505S-W75R3 chip. The +VO pin of the 75R3 chip outputs a first voltage signal; the GND pins of the K7805-2000R3 chip and the IB0505S-W75R3 chip are grounded, a capacitor C3 is connected between the Vin pin of the K7805-2000R3 chip and the ground, a capacitor C6 is connected between the Vout pin of the K7805-2000R3 chip and the ground; the 0V pin of the IB0505S-W75R3 chip is grounded, a capacitor C2 is connected between the +VO pin of the IB0505S-W75R3 chip and the ground.

10. The high-pressure water heating PTC control device according to claim 1, characterized in that: The PTC load includes a PTC load A and a PTC load B, the first relay drive unit includes a first relay drive unit A and a first relay drive unit B, the first relay includes a first relay A and a first relay B, the PTC load A and the PTC load B are connected in parallel, the PTC load A, the contacts of the first relay A and the contacts of the second relay are connected in series to form a first circuit A, the PTC load A, the contacts of the first relay A and the contacts of the second relay are connected in series to form a first circuit B, the output end of the first relay drive unit A is connected to the coil of the first relay A, and the output end of the first relay drive unit B is connected to the coil of the first relay B.

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