Vehicle-mounted air conditioner control circuit

Abstract

The utility model discloses a vehicle-mounted air conditioner control circuit, which comprises a protection circuit and a control circuit, the protection circuit comprises two connected first MOS transistors, the control circuit comprises two connected second MOS transistors, the drain electrodes of the two first MOS transistors are connected with a joint P13, the source electrodes of the two first MOS transistors are connected with the drain electrodes of the two second MOS transistors, and the source electrodes of the two second MOS transistors are connected with the joint P13. And the grid electrodes of the two second MOS tubes are used for receiving a control signal HEAT con. The control circuit is integrated on the circuit board, a relay is replaced, the control circuit is installed in a vehicle in an integrated circuit board mode, occupied space is small, cables are omitted, and cost is low.

Description

Technical Field

[0001] The utility model relates to a vehicle-mounted air conditioner, in particular to a control circuit for a vehicle-mounted air conditioner. Background Art

[0002] The heating of a vehicle-mounted air conditioner is in the form of electric heating, using a heating wire for heating. Currently, a high-power relay is used to control the heating of the heating wire. After the relay is closed, the heating wire works. However, the relay is connected by contacts and cables, and it is easy for the contacts to have poor contact after vibration. The relay has a large volume and is not easy to be integrated into the circuit board, with high cost, large vibration, complex wiring harness laying, and cumbersome assembly. Content of the Utility Model

[0003] To solve the defects of the above-mentioned prior art, the utility model provides a control circuit for a vehicle-mounted air conditioner. The control circuit of the utility model is integrated on a circuit board to replace the relay, and is installed in the vehicle in the form of an integrated circuit board, occupying a small space, canceling the cables, and having low cost.

[0004] To achieve the above technical purpose, the utility model adopts the following technical solution: A control circuit for a vehicle-mounted air conditioner includes a protection circuit and a control circuit. The protection circuit includes two connected first MOS transistors. The control circuit includes two connected second MOS transistors. The drains of the two first MOS transistors are connected to connector P13. The sources of the two first MOS transistors are connected to the drains of the two second MOS transistors. The gates of the two second MOS transistors receive a control signal HEAT con.

[0005] Further, the protection circuit further includes a resistor R65, a resistor R67, a capacitor C49, a resistor R102, a resistor R64, a capacitor C50, a resistor R68, and a diode D24. The two first MOS transistors include an MOS transistor V12 and an MOS transistor V13. The gate of the MOS transistor V12 is connected to the resistor R65. The gate of the MOS transistor V13 is connected to the resistor R67. The resistor R65, the resistor R67, the capacitor C49, and the resistor R102 are all connected to the resistor R64. The capacitor C49 and the resistor R102 are connected in parallel and then connected to the resistor R68. The sources of the MOS transistor V12 and the MOS transistor V13 are connected to the resistor R68. One path of the resistor R68 accesses the VS3 signal, and the other path accesses the +15V signal through the series-connected capacitor C50 and diode D24.

[0006] Further, the control circuit further includes a resistor R75, a resistor R76, a capacitor C19, a triode P16Y2, a resistor R49, a resistor R53, a diode D21, a triode P14Y2, a resistor R50, a triode N3Y1, a resistor R55, a resistor R52, and a resistor R54; the two second MOS transistors include an MOS transistor V14 and an MOS transistor V15. The drains of the MOS transistor V14 and the MOS transistor V15 are connected to the sources of the MOS transistors V12 and V13. The gate of the MOS transistor V14 is connected to the resistor R75, and the gate of the MOS transistor V15 is connected to the resistor R76. The emitter of the resistor R75, the resistor R76, the capacitor C19, and the triode P16Y2 are all connected to the resistor R49. The resistor R49 is connected to the diode D21. The other end of the capacitor C19 and the collector of the triode P16Y2 are connected to the resistor R53. The sources of the MOS transistor V14 and the MOS transistor V15 are connected to the resistor R53. The resistor R53, the base of the triode P16Y2, and the diode D21 are connected to the collector of the triode P14Y2. The emitter of the triode P14Y2 is connected to the +15V signal. One path of the base of the triode P14Y2 is connected to the resistor R50, and the other path is connected to the collector of the triode N3Y1. The resistor R50 is connected to the +15V signal. The emitter of the triode N3Y1 is grounded through the resistor R55. The base of the triode N3Y1 is connected to the resistor R52. One path of the resistor R52 receives the control signal HEAT con, and the other path is connected to the resistor R54. The resistor R54 is grounded.

[0007] Further, the drains of the MOS transistor V14 and the MOS transistor V15 are connected to a resistor R100. One path of the resistor R100 is connected to a diode D27, and the other path is connected to a resistor R101. The diode D27 is connected to the +5V signal. The resistor R101 is connected in parallel with a capacitor C56 and then grounded. The capacitor C56 accesses the signal RELAY CUR. The capacitor C56 is connected to a resistor R91.

[0008] In summary, the present utility model has achieved the following technical effects:

[0009] The present utility model uses a circuit board to replace a relay, which is built inside the controller, eliminates cables, is suitable for occasions with large vehicle vibrations, and uses surface-mounted electronic components, with low costs.

[0010] The present utility model has a frequency conversion function, can accurately control the temperature, replaces the way that the relay only conducts and closes, and can adjust many change ways in the middle. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is the circuit schematic diagram provided by the embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The following further describes the present utility model in detail with reference to the accompanying drawings.

[0013] This specific embodiment is only an interpretation of the present utility model, and it is not a limitation of the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

[0014] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0015] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0016] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0017] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0018] Embodiment:

[0019] As shown Figure 1 in the figure is a vehicle air conditioner control circuit, including a protection circuit and a control circuit. The protection circuit includes two connected first MOS transistors, and the control circuit includes two connected second MOS transistors. The drains of the two first MOS transistors are connected to the joint P13, the sources of the two first MOS transistors are connected to the drains of the two second MOS transistors, and the gates of the two second MOS transistors receive the control signal HEAT con.

[0020] The protection circuit further includes a resistor R65, a resistor R67, a capacitor C49, a resistor R102, a resistor R64, a capacitor C50, a resistor R68, and a diode D24. The two first MOS transistors include a MOS transistor V12 and a MOS transistor V13. The gate of the MOS transistor V12 is connected to the resistor R65, and the gate of the MOS transistor V13 is connected to the resistor R67. The resistor R65, the resistor R67, the capacitor C49, and the resistor R102 are all connected to the resistor R64. The capacitor C49 and the resistor R102 are connected in parallel and then connected to the resistor R68. The sources of the MOS transistor V12 and the MOS transistor V13 are connected to the resistor R68. One path of the resistor R68 accesses the VS3 signal, and the other path accesses the +15V signal through the series-connected capacitor C50 and diode D24.

[0021] R64 and R65 are the drive current-limiting resistors of MOSV12 and V13, C49 is a filter capacitor, and R102 is a pull-down protection resistor. D24 is a drive power supply diode, C50 is a power supply filter capacitor, and R68 is a current-limiting resistor.

[0022] The control circuit further includes resistor R75, resistor R76, capacitor C19, triode P16Y2, resistor R49, resistor R53, diode D21, triode P14Y2, resistor R50, triode N3Y1, resistor R55, resistor R52, and resistor R54; the two second MOS transistors include MOS transistor V14 and MOS transistor V15. The drains of MOS transistor V14 and MOS transistor V15 are connected to the sources of MOS transistors V12 and V13. The gate of MOS transistor V14 is connected to resistor R75, and the gate of MOS transistor V15 is connected to resistor R76. The emitters of resistor R75, resistor R76, capacitor C19, and triode P16Y2 are all connected to resistor R49. Resistor R49 is connected to diode D21. The other end of capacitor C19 and the collector of triode P16Y2 are connected to resistor R53. The sources of MOS transistor V14 and MOS transistor V15 are connected to resistor R53. Resistor R53, the base of triode P16Y2, and diode D21 are connected to the collector of triode P14Y2. The emitter of triode P14Y2 is connected to the +15V signal. One path of the base of triode P14Y2 is connected to resistor R50, and the other path is connected to the collector of triode N3Y1. Resistor R50 is connected to the +15V signal. The emitter of triode N3Y1 is grounded through resistor R55. The base of triode N3Y1 is connected to resistor R52. Resistor R52 receives the control signal HEAT con on one path and is connected to resistor R54 on the other path. Resistor R54 is grounded.

[0023] MOS transistors V12, V13, V14, and V15 serve as power switches for turning on or off the heater.

[0024] Triodes P14Y2, N3Y1, and P16Y2 act as drive switches. D21, R49, and R75 are the drive current-limiting diode and drive current-limiting resistors for MOS transistors V14 and V15, and C19 is a filtering capacitor.

[0025] R53 is a discharge resistor, R50 is a pull-up resistor, R52 and R55 are current-limiting resistors, and R54 is a pull-down protection resistor.

[0026] The drains of MOS transistor V14 and MOS transistor V15 are connected to resistor R100. One path of resistor R100 is connected to diode D27, and the other path is connected to resistor R101. Diode D27 is connected to the +5V signal. Resistor R101 is connected in parallel with capacitor C56 and then grounded. Capacitor C56 is connected to the signal RELAY CUR, and capacitor C56 is connected to resistor R91.

[0027] R100 and R101 are voltage-dividing resistors, D27 is a limiting diode, C56 is a filtering capacitor, and R91 is a current-limiting resistor.

[0028] The electronic components of the present utility model can be surface-mounted, with low cost, convenient assembly, small size, and much smaller volume than that of a relay after being integrated on a circuit board, occupying little space.

[0029] The present utility model also has a frequency conversion function to accurately control the temperature.

[0030] Working principle:

[0031] The HO3 signal is connected from the resistor R64 as the switching signal for V12 and V13, and the HEAT con is used as the switching signal for V14 and V15;

[0032] When V12 and V13 are damaged, the voltage-dividing circuit of R100 and R101 will generate a voltage, the protection circuit will act, V14 and V15 will replace V12 and V13 to work, and the signal will be transmitted to the MCU to issue an alarm.

[0033] The above description is only a preferred embodiment of the present utility model, and does not impose any form of limitation on the present utility model. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A vehicle air conditioning control circuit, characterized in that: It includes a protection circuit and a control circuit, wherein the protection circuit includes two first MOS tubes connected to each other, and the control circuit includes two second MOS tubes connected to each other, wherein the drains of the two first MOS tubes are connected to a connector P13, the sources of the two first MOS tubes are connected to the drains of the two second MOS tubes, and the gates of the two second MOS tubes receive a control signal HEAT con.

2. The vehicle air conditioning control circuit according to claim 1, characterized in that: The protection circuit also includes a resistor R65, a resistor R67, a capacitor C49, a resistor R102, a resistor R64, a capacitor C50, a resistor R68, and a diode D24; the two first MOS transistors include a MOS transistor V12 and a MOS transistor V13, the gate of the MOS transistor V12 is connected to the resistor R65, the gate of the MOS transistor V13 is connected to the resistor R67, the resistor R65, the resistor R67, the capacitor C49, and the resistor R102 are all connected to the resistor R64, the capacitor C49 and the resistor R102 are connected in parallel to the resistor R68, the source electrodes of the MOS transistors V12 and V13 are connected to the resistor R68, the resistor R68 is connected to the VS3 signal in one way, and is connected to the +15V signal in the other way through the capacitor C50 and the diode D24 connected in series.

3. The vehicle air conditioning control circuit according to claim 1, characterized in that: The control circuit also includes a resistor R75, a resistor R76, a capacitor C19, a transistor P16Y2, a resistor R49, a resistor R53, a diode D21, a transistor P14Y2, a resistor R50, a transistor N3Y1, a resistor R55, a resistor R52, and a resistor R54; the two second MOS transistors include a MOS transistor V14 and a MOS transistor V15, the drains of the MOS transistors V14 and V15 are connected to the sources of the MOS transistors V12 and V13, the gate of the MOS transistor V14 is connected to the resistor R75, the gate of the MOS transistor V15 is connected to the resistor R76, the resistor R75, the resistor R76, the capacitor C19, and the emitter of the transistor P16Y2 are all connected to the resistor R49, Resistor R49 is connected to diode D21, the other end of capacitor C19 and the collector of transistor P16Y2 are connected to resistor R53, the sources of MOS transistor V14 and MOS transistor V15 are connected to resistor R53, resistor R53, the base of transistor P16Y2, and diode D21 are connected to the collector of transistor P14Y2, the emitter of transistor P14Y2 is connected to +15V signal, the base of transistor P14Y2 is connected to resistor R50 in one way and to the collector of transistor N3Y1 in another way, resistor R50 is connected to +15V signal, the emitter of transistor N3Y1 is grounded through resistor R55, the base of transistor N3Y1 is connected to resistor R52, resistor R52 receives control signal HEAT con in one way and is connected to resistor R54 in another way, and resistor R54 is grounded.

4. The vehicle air conditioning control circuit according to claim 3, characterized in that: The drains of the MOS transistors V14 and V15 are connected to resistor R100, one path of the resistor R100 is connected to diode D27 and the other path is connected to resistor R101, diode D27 is connected to +5V signal, resistor R101 is connected to capacitor C56 in parallel and then grounded, capacitor C56 is connected to signal RELAY CUR, and capacitor C56 is connected to resistor R91.

Images