阅读说明：本技术 一种用于ptc水加热器接插件故障检测系统 (Connector fault detection system for PTC water heater ) 是由 丁超 于 2020-07-07 设计创作，主要内容包括：本发明属于接插件故障检测领域,特别涉及一种用于PTC水加热器接插件故障检测系统,通过MCU发出检测信号,并通过信号发生电路和信号接收电路后,接收信号接收电路的信号,从而确定信号发生电路与信号接收电路的插接件是否连接良好,进而实现检测插接件是否有故障,同时实现了安全且价格低廉的故障检测系统。(The invention belongs to the field of connector fault detection, and particularly relates to a fault detection system for a PTC water heater connector.)

1. A fault detection system for a PTC water heater connector is characterized by comprising

MCU；

The signal generating circuit receives the output pulse signal of the MCU and sends out a detection signal;

the signal receiving circuit receives the detection signal of the signal generating circuit and sends an input pulse signal to the MCU;

the plug connectors comprise a first plug connector used for communicating a power supply and the PTC water heater and a second plug connector used for communicating a signal generating circuit and a signal receiving circuit;

and the MCU determines whether the plug connector is well connected or not by detecting whether the signal receiving circuit receives the signal sent by the signal generating circuit or not.

2. A system for detecting connector failure in a PTC water heater as claimed in claim 1, wherein:

the MCU comprises an IO port output pulse signal PWM _ PLUG _ OUT;

the signal generating circuit comprises a triode T4, a triode T3, a resistor R11 and a resistor R12, an IO port of the MCU outputs a pulse signal PWM _ PLUG _ OUT and is connected with a base of the triode T4, an emitting electrode of the triode T4 is grounded, a collecting electrode of the triode T4 is connected with the base of the triode T3, the emitting electrode of the triode T3 is connected with a power supply, the resistor R11 and the resistor R12 are connected in parallel, one end of the resistor R11 and the resistor R12 after being connected in parallel is connected with a collecting electrode of the triode T3, and the other end of the resistor R11 and the resistor R12 after being connected in parallel is connected with a second PLUG connector.

3. A connector fault detection system for a PTC water heater according to claim 1,

the MCU comprises an IO port input pulse signal PWM _ PLUG _ IN;

the signal receiving circuit comprises a pull-up resistor R9, a resistor R10, a diode D4, a capacitor C10 and a triode T2,

one end of the resistor R10, the cathode of the diode D4, one end of the capacitor C10 and the base of the triode T2 are connected with the second PLUG connector, the other end of the resistor R10, the anode of the diode D4, the other end of the capacitor C10 and the emitter of the triode T2 are grounded, and the collector of the triode T2 is connected with the pull-up resistor R9 and the input pulse signal PWM _ PLUG _ IN of the IO port respectively.

4. A connector fault detection system for a PTC water heater according to claim 1,

the first plug connector comprises a first plug connector (1) communicated with the positive pole of the power supply and a second plug connector (2) communicated with the negative pole of the power supply;

the second plug connector comprises a first second plug connector (3) and a second plug connector (4), and the first second plug connector (3) is electrically connected with the second plug connector (4).

Technical Field

The invention belongs to the field of connector fault detection, and particularly relates to a connector fault detection system for a PTC water heater.

Background

Whether the PTC water heater connector contacts well or not is generally detected by acquiring voltages at two ends of the connector through an MCU (microprogrammed control unit), and the acquisition of the voltages comprises two methods: firstly, voltage at two ends of a plug-in unit is directly acquired by an MCU (micro control unit) after voltage division by a plurality of resistors, and a common PTC (positive temperature coefficient) water heater is a high-voltage plug-in unit, so that the isolation between a high-voltage circuit and a low-voltage circuit is not performed, and the part of the low-voltage circuit which is punctured is easily damaged to a certain extent; the second method is to add an isolation device on the basis of the first method, so that the safety is increased to a certain extent, but the cost is also increased, and therefore, it is important to design a safe and low-cost fault detection system.

Disclosure of Invention

The invention provides a fault detection system for a plug connector of a PTC water heater, aiming at designing a safe and low-cost fault detection system, and providing the fault detection system for the plug connector of the PTC water heater.

The invention provides a fault detection system for a PTC water heater connector, which comprises

MCU；

The signal generating circuit receives the output pulse signal of the MCU and sends out a detection signal;

the signal receiving circuit receives the detection signal of the signal generating circuit and sends an input pulse signal to the MCU;

the plug connectors comprise a first plug connector used for communicating a power supply and the PTC water heater and a second plug connector used for communicating a signal generating circuit and a signal receiving circuit;

and the MCU determines whether the plug connector is well connected or not by detecting whether the signal receiving circuit receives the signal sent by the signal generating circuit or not.

The invention provides a fault detection system for a PTC water heater connector, wherein an MCU comprises an IO port output pulse signal PWM _ PLUG _ OUT;

the signal generating circuit comprises a triode T4, a triode T3, a resistor R11 and a resistor R12, an IO port of the MCU outputs a pulse signal PWM _ PLUG _ OUT and is connected with a base of the triode T4, an emitting electrode of the triode T4 is grounded, a collecting electrode of the triode T4 is connected with the base of the triode T3, the emitting electrode of the triode T3 is connected with a power supply, the resistor R11 and the resistor R12 are connected in parallel, one end of the resistor R11 and the resistor R12 after being connected in parallel is connected with a collecting electrode of the triode T3, and the other end of the resistor R11 and the resistor R12 after being connected in parallel is connected with a second PLUG connector.

The invention provides a fault detection system for a PTC water heater connector, wherein an MCU comprises an IO port input pulse signal PWM _ PLUG _ IN;

the signal receiving circuit comprises a pull-up resistor R9, a resistor R10, a diode D4, a capacitor C10 and a triode T2,

one end of the resistor R10, the cathode of the diode D4, one end of the capacitor C10 and the base of the triode T2 are connected with the second PLUG connector, the other end of the resistor R10, the anode of the diode D4, the other end of the capacitor C10 and the emitter of the triode T2 are grounded, and the collector of the triode T2 is connected with the pull-up resistor R9 and the input pulse signal PWM _ PLUG _ IN of the IO port respectively.

The invention provides a plug connector fault detection system for a PTC water heater, wherein a first plug connector comprises a first plug connector communicated with the positive pole of a power supply and a second plug connector communicated with the negative pole of the power supply;

the second plug connector comprises a first second plug connector and a second plug connector, and the first second plug connector is electrically connected with the second plug connector.

Compared with the prior art, the embodiment of the invention has the following beneficial effects: the purpose of this patent is just to detect whether the connector contacts well.

The embodiment of the invention provides a fault detection system for a plug connector of a PTC water heater, which sends out a detection signal through an MCU (microprogrammed control Unit), and receives the signal of a signal receiving circuit after passing through a signal generating circuit and the signal receiving circuit, so as to determine whether the plug connector of the signal generating circuit and the signal receiving circuit is well connected, further realize the detection of whether the plug connector has a fault, and simultaneously realize a safe and low-cost fault detection system;

when the product does not work or does not work according to logic, the specific reason reported to the vehicle-mounted ECU is that a host factory or a 4S shop is convenient to troubleshoot fault reasons. When the vehicle is in the driving process, the situation of vibration can occur, so that the plug-in is not in good contact, and the main purpose is to help quickly locate the fault point of the product. Can regard as high voltage power plug to pull out the electricity and detect, nevertheless when the connector contact is good, the outside does not supply power really, and this patent circuit design can't detect out outside outage trouble.

The PLUG connector of the detection circuit is synchronous with a high-voltage power supply PLUG, when the high-voltage power supply PLUG is pulled out of a socket or loosened, two contact points of the PLUG connector lose connection, a signal is about to be incapable of being transmitted to a signal receiving circuit, no pulse signal is output from an input pulse signal PWM _ PLUG _ IN end of an IO port, when the system finds that no signal exists at the point, the heating control of a PTC device is cut off, a fault signal is sent to an upper computer through a LIN/CAN bus, and the fault detection of the high-voltage PLUG is completed;

in the embodiment, the fault of the connector is not identified by adopting a traditional voltage detection method, but a low-voltage pulse signal is adopted as an input signal, and the fault detection method is relatively safe, reliable, low in price, convenient and easy to implement compared with the traditional connector fault detection method through a certain circuit and connector matching design.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic circuit diagram of a system for detecting a connector fault in a PTC water heater according to the present invention;

FIG. 2 is a schematic view of a connector assembly;

fig. 3 is a schematic diagram of the connection of the microprocessor to the signal generating circuit and the signal receiving circuit.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

Referring to fig. 1-3, an embodiment of the invention provides a system for detecting a connector fault of a PTC water heater, including an MCU;

the signal generating circuit receives the output pulse signal of the MCU and sends out a detection signal;

the signal receiving circuit receives the detection signal of the signal generating circuit and sends an input pulse signal to the MCU;

the plug connectors comprise a first plug connector used for communicating a power supply and the PTC water heater and a second plug connector used for communicating a signal generating circuit and a signal receiving circuit;

the MCU determines whether the plug connector is well connected or not by detecting whether the signal receiving circuit receives the signal sent by the signal generating circuit or not;

referring to fig. 2, the first plug connector includes a first plug connector 1 communicated with the positive electrode of the high-voltage power supply and a second plug connector 2 communicated with the negative electrode of the high-voltage power supply;

the second plug connector comprises a first plug connector 3 and a second plug connector 4, and the first plug connector 3 is electrically connected with the second plug connector 4; the first plug connector 1 and the second plug connector 2 represent the positive pole and the negative pole of a high-voltage power supply respectively, the first second plug connector 3 and the second plug connector 4 form an interlocking insertion piece, and the interlocking insertion piece is matched with JP1 in figure 1 to enable a signal generating circuit and a signal receiving circuit to form a loop

The MCU comprises an IO port output pulse signal PWM _ PLUG _ OUT and an IO port input pulse signal PWM _ PLUG _ IN;

referring to fig. 1, the signal generating circuit includes a transistor T4, a transistor T3, a resistor R11, a JP1 interface, and a resistor R12, an IO port of the MCU outputs a pulse signal PWM _ PLUG _ OUT, which is connected to a base of a transistor T4, an emitter of a transistor T4 is grounded, a collector of a transistor T4 is connected to a base of a transistor T3, an emitter of a transistor T3 is connected to a +12V power supply, a resistor R11 is connected in parallel to a resistor R12, one end of the resistor R11 connected in parallel to a resistor R12 is connected to a collector of the transistor T3, the other end of the resistor R11 connected in parallel to a resistor R12 is connected to a pin of the JP1 interface 2, and a pin of the JP1 interface 2 is connected to a second connector ii 4 in; the pulse signal 1(PWM _ PLUG _ OUT) with certain frequency and duty ratio is output through an IO port of the ECU, the pulse signal 1 can drive a triode T4, so that a collector of the triode T4 outputs a pulse width signal 2 with amplitude of 12V complementary with the duty ratio of the pulse signal 1, the pulse signal 2 can drive a triode T3, the collector of the triode outputs a pulse width signal 3 with the same duty ratio as the pulse signal 1 but amplitude of 12V, and a pin 2 of JP1 in the graph 1 also outputs a pulse signal 4 with the same pulse width and different amplitudes as the pulse signal 3.

Referring to fig. 1, the signal receiving circuit includes a pull-up resistor R9, a resistor R10, a diode D4, a capacitor C10, a JP1 interface, and a transistor T2,

one end of the resistor R10, the cathode of the diode D4, one end of the capacitor C10 and the base of the triode T2 are connected with the JP1 interface 1 pin, the JP1 interface 1 pin is connected with the second PLUG connector I3 IN a pluggable manner, the other end of the resistor R10, the anode of the diode D4, the other end of the capacitor C10 and the emitter of the triode T2 are grounded, and the collector of the triode T2 is connected with the pull-up resistor R9 and the IO port input pulse signal PWM _ PLUG _ IN respectively. In fig. 1, pin 1 and pin 2 of JP1 are connected together by a plug connector, so pin 1 of JP1 also outputs a pulse signal 5 identical to pulse signal 4, and pulse signal 5 can drive transistor T2, so that the collector of transistor T2 outputs a pulse signal 6 having a pulse width identical to that of pulse signal 5 and having an amplitude VCC

(PWM_PLUG_IN)。

When the product does not work or does not work according to logic, the specific reason is reported to the vehicle-mounted ECU, and the fault reason can be conveniently checked by a host factory or a 4S store. When the vehicle is in the driving process, the situation of vibration can occur, so that the plug-in is not in good contact, and the main purpose is to help quickly locate the fault point of the product. Can regard as high voltage power plug to pull out the electricity and detect, nevertheless when the connector contact is good, the outside does not supply power really, and this patent circuit design can't detect out outside outage trouble.

The JP1 of the detection circuit is synchronous with a high-voltage power supply PLUG, when the high-voltage power supply PLUG is pulled out of a socket or loosened, two joints of the JP1 are disconnected, signals transmitted by the T3, the T4 and the like cannot be transmitted to the T2, no pulse signal is output at a PWM _ PLUG _ IN end, the signals are monitored by software IN a single chip microcomputer, when the signals are found to be absent at the points, the heating control of a PTC device is cut off, fault signals are sent to an upper computer through a LIN/CAN bus, and fault detection of the high-voltage PLUG is completed.

In the embodiment, the fault of the connector is not identified by adopting a traditional voltage detection method, but a low-voltage pulse signal is used as an input signal, and a loop is formed by a certain circuit, a connector interlocking pin and JP 1.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.