Switch control circuit and collision switch

Abstract

The utility model relates to the technical field of collision switches, and discloses a switch control circuit with higher reliability, which comprises a high-voltage circuit breaker (K101) for controlling the on-off of a high-voltage loop, a first switch module (101), a second switch module (102) and a third switch module (103), and is characterized in that the second switch module (102) is used for controlling the on-state of the first switch module (101), and the third switch module (103) is used for controlling the off-state of the second switch module (102); the first switch module (101) is used for controlling the switch-on state of the high-voltage circuit breaker (K101), and the third switch module (103) is used for controlling the switch-off state of the first switch module (101) so as to control the switch-off state of the high-voltage circuit breaker (K101).

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of collision switch, more specifically, relate to a switch control circuit and collision switch. BACKGROUND

[0002] The power source of electric vehicle comes from power battery reserving electric energy, these power batteries carry high voltage, therefore must ensure that the whole vehicle system has sufficient high voltage protection measure. When collision occurs, the automobile can damage the high voltage protection device of the whole vehicle, causes high voltage leakage, this can cause electric shock, endangers the safety of driver and passenger. The traditional collision protection scheme usually relies on controller area network (CAN) communication line to receive the signal sent by collision sensor, and sends control signal to cut off high voltage loop by controller. However, if the controller fails due to collision, or the CAN communication line is broken, then the high voltage safety cannot be guaranteed.

[0003] Therefore, how to ensure that the collision sensor can send signals in time, and cut off the power supply of high voltage battery pack quickly, to guarantee the safety of high voltage system becomes the technical problem that the person skilled in the art needs to solve urgently. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem that the controller of prior art fails due to collision, or the CAN communication line is broken, so that the defect of high voltage safety cannot be guaranteed, provides a kind of switch control circuit with higher reliability.

[0005] The technical scheme that the utility model solves its technical problem is: construct a kind of switch control circuit, with:

[0006] High voltage breaker, one end of its coil is connected with external power supply end,

[0007] The main contact of the high voltage breaker is connected in series in the high voltage loop of high voltage battery pack, for controlling the on-off of the high voltage loop;

[0008] First switch module, its first end is connected with the other end of the coil of the high voltage breaker,

[0009] The second end of the first switch module is connected with common terminal;

[0010] Second switch module, one end is connected with the other end of the coil of the high voltage breaker,

[0011] The other end of the second switch module is connected with the third end of the first switch module,

[0012] The second switch module is configured to control the on state of the first switch module to control the on of the high-voltage cutout.

[0013] A third switch module, one end of which is connected to the external power supply end and the other end of the coil of the high-voltage cutout, respectively,

[0014] The other end of the third switch module is connected to the common end,

[0015] The third switch module is configured to control the off state of the first switch module to control the off of the high-voltage cutout.

[0016] In some embodiments, when the second switch module is controlled to be on and the third switch module is in the off state, the first switch module is controlled to be on, and the high-voltage cutout is in the on state,

[0017] When the second switch module is controlled to be off and the third switch module is in the on state, the first switch module is controlled to be off, the high-voltage cutout is in the off state, and the high-voltage loop of the high-voltage battery pack is controlled to be off.

[0018] In some embodiments, the first switch module includes a thyristor,

[0019] The anode of the thyristor is connected to the other end of the coil and one end of the second switch module, respectively,

[0020] The control end of the thyristor is connected to the other end of the second switch module,

[0021] The cathode of the thyristor is connected to the common end.

[0022] In some embodiments, the second switch module includes at least a first switch, a first resistor, and a third diode connected in series,

[0023] One end of the first switch is connected to one end of the first resistor,

[0024] The other end of the first resistor is connected to the anode of the third diode and the anode of the thyristor, respectively,

[0025] The cathode of the third diode is connected to one end of the coil,

[0026] The other end of the first switch is coupled to the control end of the thyristor.

[0027] In some embodiments, the third switch module includes a second switch,

[0028] One end of the second switch is connected to the external power supply end and the anode of the thyristor, respectively,

[0029] The other end of the second switch is connected to the common terminal.

[0030] When the second switch is turned on, the anode voltage of the thyristor is pulled down, causing the thyristor to switch from the on state to the off state.

[0031] In some embodiments, one end of the second switch is connected to the external power supply terminal via a second resistor and a light-emitting diode connected in series.

[0032] The other end of the second switch is connected to the common terminal.

[0033] In a second aspect, a collision switch includes any of the switch control circuits described above.

[0034] The switch control circuit described in this utility model includes a high-voltage circuit breaker for controlling the on / off state of the high-voltage circuit, a first switch module, a second switch module, and a third switch module. The second switch module controls the on state of the first switch module to control the on state of the high-voltage circuit breaker, and the third switch module controls the off state of the first switch module to control the off state of the high-voltage circuit breaker. Using this technical solution, when a vehicle collides and reaches a set value, the collision sensor emits a collision signal, the high-voltage circuit breaker operates, and cuts off the high-voltage power to the high-voltage battery pack. When the vehicle is out of control, manually pressing the collision switch activates the high-voltage circuit breaker, thereby cutting off the high-voltage power. This effectively solves the problem of high-voltage safety being compromised if the controller fails due to a collision or the CAN communication line breaks. Attached Figure Description

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0036] Figure 1 This is a circuit diagram of an embodiment of the switch control circuit provided by this utility model. Detailed Implementation

[0037] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0038] like Figure 1 As shown, in the first embodiment of the switch control circuit of this utility model, the switch control circuit 100 includes at least a high-voltage circuit breaker K101, a first switch module 101, a second switch module 102, and a third switch module 103.

[0039] Among them, the main contacts of the high-voltage circuit breaker K101 are connected to the high-voltage circuit of the high-voltage battery pack (not shown) to control the on / off state of the high-voltage circuit.

[0040] The first switch module 101 is connected to the coil of the high-voltage circuit breaker K101 and is used to control the on / off state of the high-voltage circuit breaker K101.

[0041] The second switch module 102 is connected to the control terminal of the first switch module 101 and is used to control the on / off state of the first switch module 101.

[0042] The third switch module 103 is connected to the coil of the high-voltage circuit breaker K101 and is used to control the on / off state of the high-voltage circuit breaker K101.

[0043] Specifically, one end of the coil of the high-voltage circuit breaker K101 (corresponding to pin 1) is connected to the external power supply (corresponding to +12V) to provide working power for the closing of its main contacts;

[0044] The main contacts of the high-voltage circuit breaker K101 are connected in series to the high-voltage circuit of the high-voltage battery pack (not shown). When the coil of the high-voltage circuit breaker K101 forms a current loop, the main contacts of the high-voltage circuit breaker K101 are energized and conduction is achieved, thereby controlling the conduction of the high-voltage circuit of the high-voltage battery pack (not shown).

[0045] When the coil of the high-voltage circuit breaker K101 does not form a current loop, the main contacts of the high-voltage circuit breaker K101 are in the open state, thereby controlling the shutdown of the high-voltage circuit of the high-voltage battery pack (not shown).

[0046] Furthermore, the first end of the first switch module 101 is connected to the other end (corresponding to pin 2) of the coil of the high-voltage circuit breaker K101.

[0047] The second terminal of the first switch module 101 is connected to the common terminal;

[0048] One end of the second switch module 102 is connected to the other end (corresponding to pin 2) of the coil of the high-voltage circuit breaker K101.

[0049] The other end of the second switch module 102 is connected to the third end of the first switch module 101.

[0050] The second switch module 102 is used to control the conduction state of the first switch module 101 in order to control the conduction of the high voltage circuit breaker K101.

[0051] One end of the third switch module 103 is connected to both the external power supply terminal (corresponding to +12V) and the other end of the coil of the high-voltage circuit breaker K101 (corresponding to pin 2).

[0052] The other end of the third switch module 103 is connected to the common terminal.

[0053] The third switch module 103 is used to control the off state of the first switch module 101, so as to control the off state of the high voltage circuit breaker K101.

[0054] Specifically, when the second switch module 102 is controlled to be turned on and the third switch module 103 is in the off state, the first switch module 101 is controlled to be turned on, the high voltage circuit breaker K101 is in the on state, thereby controlling the conduction of the high voltage circuit of the high voltage battery pack (not shown).

[0055] When the second switch module 102 is controlled to be turned off and the third switch module 103 is in the conducting state, the first switch module 101 is controlled to be turned off, and the high voltage circuit breaker K101 is in the off state to control the high voltage circuit of the high voltage battery pack to be turned off.

[0056] Using this technical solution, when a vehicle collides and reaches a set value, the collision sensor sends a collision signal, the high-voltage cut-off switch operates, and cuts off the high-voltage power to the high-voltage battery pack; when the vehicle is out of control, the collision switch can be manually pressed, the high-voltage cut-off switch operates, and then cuts off the high-voltage power, which can effectively solve the problem of the controller failing due to a collision or the CAN communication line breaking, thus failing to guarantee high-voltage safety.

[0057] In some embodiments, to ensure that the first switching module 101 includes a thyristor D101, which functions as a switch,

[0058] Specifically, the anode of thyristor D101 is connected to the other end of the coil (corresponding to pin 2) and one end of the second switching module 102, respectively.

[0059] The control terminal (corresponding to the G terminal) of thyristor D101 is connected to the other end of the second switching module 102.

[0060] The cathode of thyristor D101 is connected to the common terminal.

[0061] When a positive voltage is applied between the anode and cathode of thyristor D101, and the second switch module 102 is turned on and the third switch module 103 is turned off, a positive trigger voltage is input between the control terminal (corresponding to the G terminal) and the cathode of thyristor D101 to control thyristor D101 to turn on. After the second switch module 102 is released and the trigger voltage is removed, it still maintains the on state.

[0062] When the second switch module 102 is turned off and the third switch module 103 is turned on, the anode of the thyristor D101 loses positive voltage and is turned off. At this time, the high voltage circuit breaker K101 is turned off to control the high voltage circuit of the high voltage battery pack to be turned off.

[0063] In some embodiments, to ensure the reliability of the second switch module 102, a first switch S101, a first resistor R101, and a third diode D103 connected in series can be provided in the second switch module 102.

[0064] One end of the first switch S101 is connected to one end of the first resistor R101.

[0065] The other end of the first resistor R101 is connected to the anode of the third diode D103 and the anode of the thyristor D101, respectively.

[0066] The cathode of the third diode D103 is connected to one end of the coil (corresponding to pin 1).

[0067] The other end of the first switch S101 is coupled to the control terminal (corresponding to G) of the thyristor D101.

[0068] Specifically, when the first switch S101 is turned on and the third switch module 103 is turned off, after the thyristor D101 is turned on, the trigger voltage is removed after the first switch S101 is released, and it still remains in the on state.

[0069] In some implementations, to ensure the reliability of the high-voltage circuit control for the high-voltage battery pack (not shown), a second switch S102 can be provided in the third switch module 103.

[0070] One end of the second switch S102 is connected to both the external power supply (corresponding to +12V) and the anode of the thyristor D101.

[0071] The other end of the second switch S102 is connected to the common terminal.

[0072] When the second switch S102 is turned on, the anode voltage of thyristor D101 is pulled down, causing thyristor D101 to switch from the on state to the off state.

[0073] One end of the second switch S102 is connected to an external power supply (corresponding to +12V) via a second resistor R102 and a light-emitting diode D102 connected in series.

[0074] The other end of the second switch S102 is connected to the common terminal.

[0075] At this time, when the second switch S102 is controlled to be turned on, the current from the external power supply terminal (corresponding to +12V) flows to the common terminal through the second resistor R102 and the light-emitting diode D102, so that no current flows through the coil of the high-voltage breaker K101, thereby controlling the high-voltage breaker K101 to switch from being turned on to being turned off.

[0076] Secondly, a collision switch includes any of the above-mentioned switch control circuits 100.

[0077] Specifically, when a vehicle collides and reaches a set value, the collision sensor sends a collision signal, the high-voltage cut-off switch K101 works, cuts off the high voltage of the high-voltage battery pack, and at the same time the indicator light on the switch (corresponding to LED D102) quickly stays on and / or flashes. Pressing the switch twice will automatically reset it.

[0078] When the vehicle is out of control, manually press the collision switch. The high-voltage circuit breaker K101 will work, thereby cutting off the high-voltage power. The indicator light will stay on and / or flash. Press it again to reset.

[0079] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A switch control circuit, characterized in that, have: A high-voltage circuit breaker, with one end of its coil connected to an external power source. The main contacts of the high-voltage circuit breaker are connected in series to the high-voltage circuit of the high-voltage battery pack to control the on / off state of the high-voltage circuit. The first switching module has its first end connected to the other end of the coil of the high-voltage circuit breaker. The second terminal of the first switch module is connected to the common terminal; The second switching module has one end connected to the other end of the coil of the high-voltage circuit breaker. The other end of the second switch module is connected to the third end of the first switch module. The second switch module is used to control the conduction state of the first switch module in order to control the high voltage circuit breaker to conduct; The third switching module has one end connected to both the external power supply terminal and the other end of the coil of the high-voltage circuit breaker. The other end of the third switch module is connected to the common terminal. The third switch module is used to control the off state of the first switch module, so as to control the off state of the high-voltage circuit breaker.

2. The switch control circuit according to claim 1, characterized in that, When the second switch module is turned on and the third switch module is turned off, the first switch module is turned on, and the high-voltage circuit breaker is in the on state. When the second switch module is controlled to turn off and the third switch module is in the on state, the first switch module is controlled to turn off, the high-voltage circuit breaker is in the off state, and the high-voltage circuit of the high-voltage battery pack is controlled to turn off.

3. The switch control circuit according to claim 1 or 2, characterized in that, The first switching module includes a thyristor. The anode of the thyristor is connected to the other end of the coil and one end of the second switching module, respectively. The control terminal of the thyristor is connected to the other end of the second switching module. The cathode of the thyristor is connected to the common terminal.

4. The switch control circuit according to claim 3, characterized in that, The second switching module includes at least a first switch, a first resistor, and a third diode connected in series. One end of the first switch is connected to one end of the first resistor. The other end of the first resistor is connected to the anode of the third diode and the anode of the thyristor, respectively. The cathode of the third diode is connected to one end of the coil. The other end of the first switch is coupled to the control terminal of the thyristor.

5. The switch control circuit according to claim 4, characterized in that, The third switch module includes a second switch. One end of the second switch is connected to both the external power supply terminal and the anode of the thyristor. The other end of the second switch is connected to the common terminal. When the second switch is turned on, the anode voltage of the thyristor is pulled down, causing the thyristor to switch from the on state to the off state.

6. The switch control circuit according to claim 5, characterized in that, One end of the second switch is connected to the external power supply terminal via a second resistor and a light-emitting diode connected in series. The other end of the second switch is connected to the common terminal.

7. A collision switch, characterized in that, Includes the switch control circuit according to any one of claims 1-6.

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