Vehicle-mounted safety output circuit

Abstract

The invention relates to a vehicle-mounted safety output circuit, which comprises a negative voltage power supply sub-circuit, a DC control input sub-circuit, a pulse input sub-circuit, an intermediate sub-circuit, an output sub-circuit, a grounding end, a VCC power supply and a load, and is characterized in that the pulse input sub-circuit is connected with the negative voltage power supply sub-circuit, and the negative voltage power supply sub-circuit and the DC control input sub-circuit are connected with the intermediate sub-circuit; the negative voltage power supply sub-circuit is connected with the DC control input sub-circuit, the middle sub-circuit is connected with the output sub-circuit, the VCC power supply is respectively connected with the middle sub-circuit and the output sub-circuit, the load is connected with the output sub-circuit, and the grounding end is respectively connected with the negative voltage power supply sub-circuit, the middle sub-circuit and the output sub-circuit. The DC control input sub-circuit and the pulse input sub-circuit are used as input, and the final output can be effective only when the low-level output of the DC control input sub-circuit and the 100KHz and 110KHz alternating pulses of the pulse input sub-circuit are ensured to be effective at the same time, so that the safety is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle safety output, in particular to a vehicle safety output circuit. BACKGROUND

[0002] In the design of vehicle output safety circuit, there are two mainstream design methods; one is through inherent fault pulse mode, based on the application of DC-DC switching power supply; this way is high in safety and easy to control; the disadvantage is that the output power is strongly related to the output capacity of the on-board power supply, the output number and the total output power. In the case of high power and multiple load driving, there are greater limitations.

[0003] Another solution is to use relays or MOS tubes; directly control the output; this design method is sufficient in supporting the output power, and the load only depends on the channel cutoff ability of the relay contact or MOS tube itself. The disadvantage is that the safety of this control is limited, and to realize the safety circuit, it needs to be realized through system architecture, such as 2-to-2, channel heterogeneous design, which has high design complexity and circuit cost.

[0004] The utility model patent with publication number CN210780533U protects the circuit and the automobile load circuit. A protection circuit, comprising: a switch module, used for connecting with a power input end and a driving circuit; and a shunt module, connected in parallel between the positive input end of the driving circuit and the ground end; wherein, when a positive voltage is input to the power input end, the switch module is closed, and the shunt module does not work; when a negative voltage pulse is input to the power input end, the switch module is closed, and the shunt module is used for shunting; when a negative voltage is input to the power input end, and the duration is greater than the time threshold, the switch module is disconnected.

[0005] Therefore, it is an urgent problem to provide a safety output circuit with stability and reliability. SUMMARY

[0006] The purpose of the present application is to overcome the defects of the prior art and provide a vehicle safety output circuit.

[0007] The purpose of the present application can be achieved by the following technical solutions:

[0008] According to one aspect of the present application, a vehicle-mounted safety output circuit is provided, comprising a negative voltage power supply sub-circuit, a DC control input sub-circuit, a pulse input sub-circuit, an intermediate sub-circuit, an output sub-circuit, a ground terminal, a VCC power supply and a load, the pulse input sub-circuit and the negative voltage power supply sub-circuit are connected, the negative voltage power supply sub-circuit and the DC control input sub-circuit are connected with the intermediate sub-circuit, the negative voltage power supply sub-circuit and the DC control input sub-circuit are connected, the intermediate sub-circuit and the output sub-circuit are connected, the VCC power supply is connected with the intermediate sub-circuit and the output sub-circuit respectively, the load is connected with the output sub-circuit, and the ground terminal is connected with the negative voltage power supply sub-circuit, the intermediate sub-circuit and the output sub-circuit respectively.

[0009] As a preferred technical solution, the DC control input sub-circuit comprises an OR gate, a first resistor, a first DC input and a second DC input, the first DC input and the second DC input (DC_MCU2) are connected with the OR gate, and the OR gate is connected with the intermediate sub-circuit through the first resistor.

[0010] As a preferred technical solution, the pulse input sub-circuit comprises an AND gate, a second resistor, a first pulse input and a second pulse input, the first pulse input and the second pulse input are connected with the AND gate (U2), and the AND gate is connected with the negative voltage power supply sub-circuit through the second resistor.

[0011] As a preferred technical solution, the pulse input sub-circuit further comprises an inverter, and the inverter is connected with the second resistor and the AND gate respectively.

[0012] As a preferred technical solution, the negative voltage power supply sub-circuit comprises a first capacitor, a second capacitor, a first diode and a second diode, one end of the first capacitor is connected with the pulse input sub-circuit, the other end of the first capacitor is connected with one end of the first diode and one end of the second diode respectively, one end of the first diode and one end of the second diode are connected, the other end of the first diode is connected with one end of the intermediate sub-circuit and one end of the second capacitor respectively, one end of the second capacitor is also connected with the intermediate sub-circuit, and the other end of the second diode and the other end of the second capacitor are connected with the ground terminal.

[0013] As a preferred technical solution, the negative voltage power supply sub-circuit further comprises a fourth resistor, one end of the fourth resistor is connected with the intermediate sub-circuit, and the other end of the fourth resistor is connected with the first diode and the second capacitor respectively.

[0014] As a preferred technical scheme, the intermediate sub-circuit comprises a first transistor, a second transistor and a third resistor, one end of the third resistor and the emitter of the second transistor are connected with the VCC power supply respectively, the other end of the third resistor is connected with the base of the second transistor and the collector of the first transistor respectively, the collector of the second transistor is connected with the output sub-circuit, the base of the first transistor is connected with the ground, and the emitter of the first transistor is connected with the negative voltage power supply sub-circuit and the DC control input sub-circuit respectively.

[0015] As a preferred technical scheme, the output sub-circuit comprises a fifth resistor, a sixth resistor, a field effect transistor and a relay, one end of the fifth resistor is connected with the intermediate sub-circuit, the other end of the fifth resistor is connected with one end of the sixth resistor and the gate of the field effect transistor respectively, the drain of the field effect transistor is connected with the relay, the other end of the sixth resistor and the source of the field effect transistor are connected with the ground, the VCC power supply is connected with the relay, and the relay is connected with the load.

[0016] As a preferred technical scheme, the relay comprises an IN end and an OUT end, and the IN end and the OUT end are connected with the load.

[0017] As a preferred technical scheme, the VCC power supply comprises a first VCC power supply and a second VCC power supply, the first VCC power supply is connected with the intermediate sub-circuit, and the second VCC power supply is connected with the output sub-circuit.

[0018] Compared with the prior art, the DC control input sub-circuit and the negative voltage power supply sub-circuit are connected with the intermediate sub-circuit, the pulse input sub-circuit and the negative voltage power supply sub-circuit are connected, and when the low-level output of the DC control input sub-circuit and the 100KHz and 110KHz alternating pulses of the pulse input sub-circuit are effective at the same time, the final output is effective, so that the safety is ensured.

[0019] 1. The DC control input sub-circuit and the negative voltage power supply sub-circuit are connected with the intermediate sub-circuit, the pulse input sub-circuit and the negative voltage power supply sub-circuit are connected, and when the low-level output of the DC control input sub-circuit and the 100KHz and 110KHz alternating pulses of the pulse input sub-circuit are effective at the same time, the final output is effective, so that the safety is ensured.

[0020] 2. The DC control input sub-circuit and the pulse input sub-circuit are connected with the intermediate sub-circuit, the pulse input sub-circuit and the negative voltage power supply sub-circuit are connected, and when the low-level output of the DC control input sub-circuit and the 100KHz and 110KHz alternating pulses of the pulse input sub-circuit are effective at the same time, the final output is effective, so that the safety is ensured.

[0021] 3. The DC control input sub-circuit and the pulse input sub-circuit are connected with the intermediate sub-circuit, the pulse input sub-circuit and the negative voltage power supply sub-circuit are connected, and when the low-level output of the DC control input sub-circuit and the 100KHz and 110KHz alternating pulses of the pulse input sub-circuit are effective at the same time, the final output is effective, so that the safety is ensured.

[0022] 4. The DC control input sub-circuit and the pulse input sub-circuit are connected with the intermediate sub-circuit, the pulse input sub-circuit and the negative voltage power supply sub-circuit are connected, and when the low-level output of the DC control input sub-circuit and the 100KHz and 110KHz alternating pulses of the pulse input sub-circuit are effective at the same time, the final output is effective, so that the safety is ensured.

[0023] 5. The pulse safety module of the present invention can effectively reduce EMI radiated emission performance and improve the EMC performance of the output path on the low-voltage side. Attached Figure Description

[0024] Figure 1 This is a circuit connection diagram of the present invention; Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] Example 1

[0027] like Figure 1 As shown, an on-board safety output circuit includes a negative voltage power supply subcircuit, a DC control input subcircuit, a pulse input subcircuit, an intermediate subcircuit, an output subcircuit, a ground terminal GND, a VCC power supply, and a load. The pulse input subcircuit and the negative voltage power supply subcircuit are connected. The negative voltage power supply subcircuit and the DC control input subcircuit are both connected to the intermediate subcircuit. The negative voltage power supply subcircuit and the DC control input subcircuit are connected. The intermediate subcircuit and the output subcircuit are connected. The VCC power supply is connected to both the intermediate subcircuit and the output subcircuit. The load is connected to the output subcircuit. The ground terminal GND is connected to the negative voltage power supply subcircuit, the intermediate subcircuit, and the output subcircuit.

[0028] In this embodiment, the present invention also includes two MCUs, namely MCU1 and MCU2. The output pins of MCU1 and MCU2 are respectively connected to the DC control input sub-circuit and the pulse input sub-circuit. As control signals, both MCU1 and MCU2 can generate level signals and pulse signals.

[0029] The DC control input sub-circuit includes an OR gate U1, a first resistor R1, a first DC input DC_MCU1, and a second DC input DC_MCU2. Both the first DC input DC_MCU1 and the second DC input DC_MCU2 are connected to the OR gate U1. The OR gate U1 is connected to an intermediate sub-circuit through the first resistor R1.

[0030] The pulse input sub-circuit comprises an AND gate U2, a second resistor R2, a first pulse input PULSE_MCU1 and a second pulse input PULSE_MCU2, the first pulse input PULSE_MCU1 and the second pulse input PULSE_MCU2 are connected to the AND gate U2, and the AND gate U2 is connected to the second resistor R2 and the negative voltage power supply sub-circuit.

[0031] In the embodiment, the or gate U1 device output is low when the actual control is effective, and DC_MCU1 and DC_MCU2 are derived from the output pins of the redundant control devices MCU1 and MCU2. When DC_MCU1 and DC_MCU2 are both low, the control output of the or gate U1 is effective, and the N-type triode Q1 is turned on to trigger the control.

[0032] PULSE_MCU1 and PULSE_MCU2 are also derived from the output pins of the redundant control devices MCU1 and MCU2, respectively; specific control adopts time division control of two different frequencies and collection mode, and the input end of U2 outputs 100KHz in T1=1s period and 110KHz in T2 period=1s period, and the pulse signal is output in this cycle.

[0033] The pulse input sub-circuit further comprises an inverter connected to the second resistor R2 and the AND gate U2.

[0034] The negative voltage power supply sub-circuit comprises a first capacitor C1, a second capacitor C2, a first diode D1 and a second diode D2, one end of the first capacitor C1 is connected to the pulse input sub-circuit, the other end of the first capacitor C1 is connected to one end of the first diode D1 and the second diode D2, respectively, one end of the first diode D1 and the second diode D2 is connected, the other end of the first diode D1 is connected to the intermediate sub-circuit and one end of the second capacitor C2, respectively, one end of the second capacitor C2 is also connected to the intermediate sub-circuit, and the other end of the second diode D2 and the other end of the second capacitor C2 are connected to the ground terminal GND.

[0035] The negative voltage power supply sub-circuit further comprises a fourth resistor R4, one end of the fourth resistor R4 is connected to the intermediate sub-circuit, and the other end of the fourth resistor R4 is connected to the first diode D1 and the second capacitor C2, respectively.

[0036] The intermediate sub-circuit comprises a first transistor Q1, a second transistor Q2 and a third resistor R3, the VCC power supply is connected with one end of the third resistor R3 and the emitter of the second transistor Q2 respectively, the other end of the third resistor R3 is connected with the base of the second transistor Q2 and the collector of the first transistor Q1 respectively, the collector of the second transistor Q2 is connected with the output sub-circuit, the base of the first transistor Q1 is connected with the ground terminal GND, and the emitter of the first transistor Q1 is connected with the negative voltage power supply sub-circuit and the DC control input sub-circuit respectively.

[0037] The output sub-circuit comprises a fifth resistor R5, a sixth resistor R6, a field effect transistor U3 and a relay Relay, one end of the fifth resistor R5 is connected with the intermediate sub-circuit, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6 and the gate of the field effect transistor U3 respectively, the drain of the field effect transistor U3 is connected with the relay Relay, the other end of the sixth resistor R6 and the source of the field effect transistor U3 are connected with the ground terminal GND, the VCC power supply is connected with the relay Relay, and the relay Relay is connected with the load.

[0038] The relay Relay comprises an IN terminal and an OUT terminal, and the IN terminal and the OUT terminal are connected with the load.

[0039] The VCC power supply comprises a first VCC power supply and a second VCC power supply, the first VCC power supply is connected with the intermediate sub-circuit, and the second VCC power supply is connected with the output sub-circuit.

[0040] In the embodiment, the negative voltage power supply sub-circuit is composed of the second resistor R2, the first capacitor C1, the second capacitor C2, the first diode D1 and the second diode D2, the value of the second resistor R2 is 100Ω, the first capacitor C1 and the second capacitor C2 are 2.2uF, the power supply of the AND gate U1 and the OR gate U2 is 3.3V, the first diode D1 and the second diode D2 use BAS40 diodes, and a voltage of about-4V is generated at the common terminal of the second capacitor C2 and the fourth resistor R4.

[0041] The resistance value of the first resistor R1 is 10KΩ, at this time, when the right side of the first resistor R1 is low and the lower side of the fourth resistor R4 is-4V, the first transistor Q1 is turned on, the base potential of the second transistor Q2 is low enough, and the second transistor Q2 is turned on.

[0042] When the second triode Q2 is turned on, the fifth resistor R5 and the sixth resistor R6 participate in the voltage division of the second VCC power supply, and the voltage of the second VCC power supply is 24v, at this time the gate level of the field effect transistor U3 is high, the drain-source channel of the field effect transistor U3 is turned on, so that the coil end of the relay Relay is powered, so that the normally open contact is closed, that is, the IN and OUT ends are turned on, and the external output is driven.

[0043] On the control side, U1 is an OR gate, and the input comes from the control signals of the two channels, only when the DC_MCU1 of one channel and the DC_MCU2 of the other channel are both low; the control is effective. When the OR gate U1 outputs a low level, and the AND gate U2 outputs a pulse at the same time, the voltage on the upper side of the second capacitor C2 is negative (about -4V) Q1 c (collector) and e (emitter) are turned on, so that Q2 c (collector) and e (emitter) are turned on and work.

[0044] In addition, for the pulse control of the control side, U2 is an AND gate, and the two channel inputs are in turn mode, one channel input is direct current high level, and the other channel input is pulse signal; Every other time period is rotated, one channel input is direct current pulse signal, and the other channel input is direct current signal.

[0045] Then the pulse signals of the two channels are time-division AND gate superposition to generate 100KHz and 110KHz time-division alternating pulses, and the corresponding signals are pulse sampled for output judgment, specifically, the current channel judges its own state while also judging the state of the other party, that is, when the current channel is pulse, the other party channel should be in high level state; When the current channel is high level, the other channel should be pulse signal, so as to realize detection closed loop. The pulse is input to the second resistor R2, the first capacitor C1, the second capacitor C2, the first diode D1 and the second diode D2 to generate a negative voltage circuit.

[0046] When the low level output of the AND gate U1 and the 100KHz pulse of U2 are effective at the same time, the output is effective, thereby ensuring safety.

[0047] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A vehicle-mounted safety output circuit, characterized in that, It includes a negative voltage power supply subcircuit, a DC control input subcircuit, a pulse input subcircuit, an intermediate subcircuit, an output subcircuit, a ground terminal (GND), a VCC power supply, and a load. The pulse input subcircuit and the negative voltage power supply subcircuit are connected. The negative voltage power supply subcircuit and the DC control input subcircuit are both connected to the intermediate subcircuit. The negative voltage power supply subcircuit and the DC control input subcircuit are connected. The intermediate subcircuit and the output subcircuit are connected. The VCC power supply is connected to both the intermediate subcircuit and the output subcircuit. The load is connected to the output subcircuit. The ground terminal (GND) is connected to the negative voltage power supply subcircuit, the intermediate subcircuit, and the output subcircuit.

2. The vehicle-mounted safety output circuit according to claim 1, characterized in that, The DC control input sub-circuit includes an OR gate (U1), a first resistor (R1), a first DC input (DC_MCU1), and a second DC input (DC_MCU2). Both the first DC input (DC_MCU1) and the second DC input (DC_MCU2) are connected to the OR gate (U1), and the OR gate (U1) is connected to the intermediate sub-circuit through the first resistor (R1).

3. The vehicle-mounted safety output circuit according to claim 1, characterized in that, The pulse input sub-circuit includes an AND gate (U2), a second resistor (R2), a first pulse input (PULSE_MCU1), and a second pulse input (PULSE_MCU2). Both the first pulse input (PULSE_MCU1) and the second pulse input (PULSE_MCU2) are connected to the AND gate (U2), and the AND gate (U2) is connected to the negative voltage power supply sub-circuit through the second resistor (R2).

4. The vehicle-mounted safety output circuit according to claim 3, characterized in that, The pulse input sub-circuit also includes an inverter, which is connected to a second resistor (R2) and an AND gate (U2).

5. The vehicle-mounted safety output circuit according to claim 1, characterized in that, The negative voltage power supply sub-circuit includes a first capacitor (C1), a second capacitor (C2), a first diode (D1), and a second diode (D2). One end of the first capacitor (C1) is connected to the pulse input sub-circuit, and the other end of the first capacitor (C1) is connected to one end of the first diode (D1) and the second diode (D2). One end of the first diode (D1) and the second diode (D2) are connected, and the other end of the first diode (D1) is connected to one end of the intermediate sub-circuit and the second capacitor (C2). One end of the second capacitor (C2) is also connected to the intermediate sub-circuit. The other ends of the second diode (D2) and the second capacitor (C2) are both connected to the ground terminal (GND).

6. The vehicle-mounted safety output circuit according to claim 5, characterized in that, The negative voltage power supply sub-circuit also includes a fourth resistor (R4), one end of which is connected to the intermediate sub-circuit, and the other end of which is connected to the first diode (D1) and the second capacitor (C2).

7. The vehicle-mounted safety output circuit according to claim 1, characterized in that, The intermediate sub-circuit includes a first transistor (Q1), a second transistor (Q2), and a third resistor (R3). The VCC power supply is connected to one end of the third resistor (R3) and the emitter of the second transistor (Q2). The other end of the third resistor (R3) is connected to the base of the second transistor (Q2) and the collector of the first transistor (Q1). The collector of the second transistor (Q2) is connected to the output sub-circuit. The base of the first transistor (Q1) is connected to the ground terminal (GND). The emitter of the first transistor (Q1) is connected to the negative voltage power supply sub-circuit and the DC control input sub-circuit.

8. The vehicle-mounted safety output circuit according to claim 1, characterized in that, The output sub-circuit includes a fifth resistor (R5), a sixth resistor (R6), a field-effect transistor (U3), and a relay. One end of the fifth resistor (R5) is connected to the intermediate sub-circuit, and the other end of the fifth resistor (R5) is connected to one end of the sixth resistor (R6) and the gate of the field-effect transistor (U3). The drain of the field-effect transistor (U3) is connected to the relay. The other end of the sixth resistor (R6) and the source of the field-effect transistor (U3) are both connected to the ground terminal (GND). The VCC power supply is connected to the relay, and the relay is connected to the load.

9. A vehicle-mounted safety output circuit according to claim 8, characterized in that, The relay includes an IN terminal and an OUT terminal, both of which are connected to the load.

10. A vehicle-mounted safety output circuit according to claim 1, characterized in that, The VCC power supply includes a first VCC power supply and a second VCC power supply. The first VCC power supply is connected to an intermediate sub-circuit, and the second VCC power supply is connected to an output sub-circuit.

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