Scram protection circuit and charging system

Abstract

The invention relates to an emergency stop protection circuit and a charging system. The emergency stop protection circuit comprises a first conduction unit, a second conduction unit and a signal isolation unit, when the first sudden stop protection signal meets a first set condition or the second sudden stop protection signal meets a third set condition, the first conduction unit and the second conduction unit are cut off at the same time to output a first control signal; when the first sudden stop protection signal meets a second set condition, the first conduction unit is conducted and the second conduction unit is cut off to output a second control signal; when the second sudden stop protection signal meets a fourth set condition, the first conduction unit is switched off, and the second conduction unit is switched on to output the second control signal; the signal isolation unit generates a working signal or a shutdown signal based on the first control signal or the second control signal. According to the invention, the processing of two different sudden stop protection signals can be realized by adopting the same set of circuit and control process, and the software and hardware cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the field of charging systems, and more particularly to an emergency stop protection circuit and a charging system. Background Art

[0002] Currently, the charging system mainly receives two types of emergency stop protection input signals, namely the external power supply emergency stop protection input signal and the dry contact input signal. Figure 1 FIG. 1 shows a circuit diagram of an emergency stop protection circuit of the prior art that receives two emergency stop protection input signals. Figure 1 As shown in the figure, the emergency stop protection circuit's AD1_OR_STOPH and AD1_OR_STOPL ports receive either an externally powered emergency stop protection input signal or a dry contact input signal. When receiving an externally powered emergency stop protection input signal, resistors R17, R14, and R34 are omitted from the emergency stop protection circuit. However, when receiving a dry contact input signal, resistors R10 and R3 are omitted from the emergency stop protection circuit. In other words, the emergency stop protection circuit for receiving an externally powered emergency stop protection input signal is different from the emergency stop protection circuit for receiving a dry contact input signal. Therefore, the system requires two different sets of dry contact protection circuits or a different bill of materials (BOM). Therefore, when receiving an externally powered emergency stop protection input signal, resistors R17, R14, and R34 are removed from the BOM, while resistors R10 and R3 are retained. When receiving a dry contact input signal, resistors R10 and R3 are removed from the BOM, while resistors R17, R14, and R34 are retained. Therefore, such a design will not only increase the hardware cost, but also require separate software design for different circuits to control them, which will lead to further cost increases. Summary of the Invention The technical problem to be solved by the present invention is to provide an emergency stop protection circuit that can respectively receive and process different emergency stop protection signals in order to reduce costs, in view of the above-mentioned defects of the prior art.

[0003] The technical solution adopted by the present invention to solve the technical problem is: constructing an emergency stop protection circuit, including: a first conduction unit, a second conduction unit and a signal isolation unit; The first conducting unit is used to receive the first emergency stop protection signal or the second emergency stop protection signal; the second conducting unit is also used to receive the first emergency stop protection signal or the second emergency stop protection signal; When the first emergency stop protection signal meets a first set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output a first control signal; When the first emergency stop protection signal meets a second set condition, the first conduction unit is turned on and the second conduction unit is turned off to output a second control signal; When the second emergency stop protection signal meets a third set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output the first control signal; When the second emergency stop protection signal meets a fourth setting condition, the first conduction unit is turned off and the second conduction unit is turned on to output the second control signal; The signal isolation unit is configured to receive the first control signal or the second control signal and generate a working signal based on the first control signal or generate a shutdown signal based on the second control signal.

[0004] In the emergency stop protection circuit of the present invention, the first conduction unit includes a voltage regulator tube, a first switch tube, a first resistor and a first capacitor; The cathode of the voltage regulator is connected to the first signal input end to receive the first emergency stop protection signal or the second emergency stop protection signal, and the anode is connected to the control end of the first switching tube through the first resistor. The first end of the first switching tube is connected to the third end of the second conduction unit, and the second end is connected to the second signal input end and the first end of the first capacitor. The second end of the first capacitor is connected to the input end of the signal isolation unit.

[0005] In the emergency stop protection circuit described in the present invention, the second conduction unit includes a first diode, a second resistor and a third resistor, the cathode of the first diode is connected to the first signal input end to receive the first emergency stop protection signal or the second emergency stop protection signal, and the cathode is connected to the first end of the second resistor, the first end of the third resistor and the first end of the first switching tube; the second end of the second resistor is connected to the power supply, and the second end of the third resistor is connected to the input end of the signal isolation unit.

[0006] In the emergency stop protection circuit of the present invention, the first emergency stop protection signal includes an external power supply emergency stop protection input signal; When the first emergency stop protection signal meets a first set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output a first control signal, including: When the external power supply emergency stop protection input signal indicates that the external power supply is high impedance or disconnected, the voltage regulator is turned off, thereby turning off the first switch tube, and the first diode is also turned off, so that the two ends of the first capacitor are at the power supply voltage, and then the first control signal is output, wherein the first control signal is a high-level signal.

[0007] In the emergency stop protection circuit of the present invention, the first emergency stop protection signal includes an external power supply emergency stop protection input signal; When the first emergency stop protection signal meets the second setting condition, the first conduction unit is turned on and the second conduction unit is turned off to output a second control signal, including: The external power supply emergency stop protection input signal indicates that when the external power supply is within the set voltage input range, the voltage regulator tube breaks down to turn on the first switch tube, and the first diode is cut off, so that the voltage across the first capacitor is less than the first set voltage, and then the second control signal is output, wherein the second control signal is a low-level signal.

[0008] In the emergency stop protection circuit of the present invention, the first emergency stop protection signal includes a dry contact input signal; When the second emergency stop protection signal satisfies a third setting condition, the first conduction unit and the second conduction unit are simultaneously turned off to output the first control signal, including: When the dry contact input signal indicates that the dry contact is disconnected, the voltage regulator is turned off, thereby turning off the first switch tube, and the first diode is also turned off, so that the two ends of the first capacitor are at the power supply voltage, and then the first control signal is output, wherein the first control signal is a high-level signal.

[0009] In the emergency stop protection circuit of the present invention, the first emergency stop protection signal includes a dry contact input signal; When the second emergency stop protection signal satisfies a fourth setting condition, the first conduction unit is turned off and the second conduction unit is turned on to output the second control signal, including: When the dry contact input signal indicates that the dry contact is closed, the voltage regulator is turned off, thereby turning off the first switch tube, and the first diode is turned on, so that the voltage across the first capacitor is less than the first set voltage, and then the second control signal is output, wherein the second control signal is a low-level signal.

[0010] In the emergency stop protection circuit described in the present invention, the signal isolation unit includes an optocoupler, a digital isolator or a shutdown coupler; the first switching tube includes a MOS tube, a transistor or an IGBT tube; the first control signal is a high-level signal, and the second control signal is a low-level signal; the shutdown signal is a high-level signal, and the working signal is a low-level signal.

[0011] In the emergency stop protection circuit of the present invention, it further includes a fourth resistor, a second capacitor and a second diode; The first end of the fourth resistor is connected to the control end of the first switch tube, and the second end is connected to the second signal input end; the first end of the second capacitor is connected to the control end of the first switch tube, and the second end is connected to the second signal input end; the cathode of the second diode is connected to the control end of the first switch tube, and the anode is connected to the second signal input end.

[0012] The technical solution adopted by the present invention to solve its technical problem is: constructing a charging system, including a power module, a controller, and the emergency stop protection circuit; the controller is used to control the power module to work based on the working signal or to control the power module to stop working based on the shutdown signal.

[0013] In the emergency stop protection circuit and charging system of the present invention, the first conduction unit and the second conduction unit can respectively receive a first emergency stop protection signal or a second emergency stop protection signal; when the first emergency stop protection signal satisfies a first set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output a first control signal; when the first emergency stop protection signal satisfies a second set condition, the first conduction unit is turned on and the second conduction unit is turned off to output a second control signal; when the second emergency stop protection signal satisfies a third set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output the first control signal; when the second emergency stop protection signal satisfies a fourth set condition, the first conduction unit is turned off and the second conduction unit is turned on to output the second control signal; the signal isolation unit receives the first control signal or the second control signal and generates an operating signal based on the first control signal or a shutdown signal based on the second control signal. Therefore, by using the same set of circuits and control processes, it is possible to receive and process two different emergency stop protection signals, realize emergency stop control of the charging system, and reduce software and hardware costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 It is a circuit diagram of an emergency stop protection circuit in the prior art; Figure 2 It is a principle block diagram of a preferred embodiment of the emergency stop protection circuit of the present invention; Figure 3 1 is a circuit diagram of a preferred embodiment of the emergency stop protection circuit of the present invention; Figures 4 and 5 They are Figure 3 The circuit flow diagram shown is when the emergency stop protection circuit generates the second control signal based on different conduction states. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] Figure 2 This is a principle block diagram of a preferred embodiment of the emergency stop protection circuit of the present invention. Figure 2 As shown, the emergency stop protection circuit includes: a first conduction unit 100, a second conduction unit 200 and a signal isolation unit 300; the first end of the first conduction unit 100 is connected to the first signal input end to receive the first emergency stop protection signal or the second emergency stop protection signal, and the second end is connected to the input end of the signal isolation unit 300; the first end of the second conduction unit 200 is also connected to the first signal input end to receive the first emergency stop protection signal or the second emergency stop protection signal, and the second end is also connected to the input end of the signal isolation unit 300. When the first emergency stop protection signal meets the first setting condition, the first conduction unit 100 and the second conduction unit 200 are simultaneously turned off to output the first control signal; when the first emergency stop protection signal meets the second setting condition, the first conduction unit 100 is turned on and the second conduction unit 200 is turned off to output the second control signal; when the second emergency stop protection signal meets the third setting condition, the first conduction unit 100 and the second conduction unit 200 are simultaneously turned off to output the first control signal; when the second emergency stop protection signal meets the fourth setting condition, the first conduction unit 100 is turned off and the second conduction unit 200 is turned on to output the second control signal; the signal isolation unit 300 receives the first control signal or the second control signal and generates a working signal based on the first control signal or generates a shutdown signal based on the second control signal.

[0017] In a preferred embodiment of the present invention, the first emergency stop protection signal includes an external power supply emergency stop protection input signal, and the second emergency stop protection signal includes a dry contact input signal. In other preferred embodiments of the present invention, when applied to other possible emergency stop scenarios, the first emergency stop protection signal and the second emergency stop protection signal may also select any other type of emergency stop signal, all of which fall within the scope of protection of the present invention.

[0018] In a preferred embodiment of the present invention, the first conduction unit 100 and the second conduction unit 200 can be constructed using any suitable conduction device, such as a switch tube, a diode, etc. In a preferred embodiment of the present invention, the signal isolation unit 300 includes an optocoupler, a digital isolator, or a shutdown coupler. The first control signal is a high-level signal, and the second control signal is a low-level signal; the shutdown signal is a high-level signal, and the working signal is a low-level signal. Of course, in other preferred embodiments of the present invention, the first control signal and the shutdown signal can be set to low-level signals, and the second control signal and the working signal can be set to high-level signals, or the first control signal and the shutdown signal can be set to first-level signals, and the second control signal and the working signal can be set to second-level signals, all of which fall within the protection scope of the present invention.

[0019] In the emergency stop protection circuit of the present invention, the first conduction unit and the second conduction unit can respectively receive a first emergency stop protection signal or a second emergency stop protection signal; when the first emergency stop protection signal meets a first set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output a first control signal; when the first emergency stop protection signal meets a second set condition, the first conduction unit is turned on and the second conduction unit is turned off to output a second control signal; when the second emergency stop protection signal meets a third set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output the first control signal; when the second emergency stop protection signal meets a fourth set condition, the first conduction unit is turned off and the second conduction unit is turned on to output the second control signal; the signal isolation unit receives the first control signal or the second control signal and generates an operating signal based on the first control signal or a shutdown signal based on the second control signal. Therefore, by adopting the same set of circuits and control processes, it is possible to receive and process two different emergency stop protection signals, realize emergency stop control of the charging system, and reduce software and hardware costs.

[0020] Figure 3 1 is a circuit diagram of a preferred embodiment of the emergency stop protection circuit of the present invention. Figures 4 and 5 They are Figure 3 The circuit flow diagram of the emergency stop protection circuit shown in FIG. Figures 3-5 The preferred embodiment of the emergency stop protection circuit of the present invention is further described as follows.

[0021] like Figure 3 As shown, the emergency stop protection circuit includes: a first conduction unit 100, a second conduction unit 200 and a signal isolation unit 300; the first end of the first conduction unit 100 is connected to the first signal input terminal STOPH to receive the first emergency stop protection signal or the second emergency stop protection signal, and the second end is connected to the input end of the signal isolation unit 300; the first end of the second conduction unit 200 is also connected to the first signal input terminal STOPH to receive the first emergency stop protection signal or the second emergency stop protection signal, and the second end is also connected to the input end of the signal isolation unit 300.

[0022] The first conducting unit 100 includes a voltage regulator diode Z1, a switch diode Q1, a resistor R1, and a capacitor C2. The cathode of the voltage regulator diode Z1 is connected to the first signal input terminal STOPH, and the anode is connected to the control terminal of the switch diode Q1 via the resistor R1. The first terminal of the switch diode Q1 is connected to the third terminal of the second conducting unit 200, and the second terminal is connected to the second signal input terminal STOPL and the first terminal of the capacitor C2. The second terminal of the capacitor C2 is connected to the input terminal of the signal isolation unit 300. The second conducting unit 200 includes a diode D2, a resistor R3, and a resistor R4. The cathode of the diode D2 is connected to the first signal input terminal STOPH, and the cathode is connected to the first terminal of the resistor R3, the first terminal of the resistor R4, and the first terminal of the switch diode Q1. The second terminal of the resistor R3 is connected to the power supply 5V, and the second terminal of the resistor R4 is connected to the input terminal of the signal isolation unit 300.

[0023] like Figure 3 As shown, the emergency stop protection circuit further includes a resistor R2, a capacitor and a diode D1; the first end of the resistor R2 is connected to the control end of the switch tube Q1, and the second end is connected to the second signal input end STOPL; the first end of the capacitor is connected to the control end of the switch tube Q1, and the second end is connected to the second signal input end STOPL; the cathode of the diode D1 is connected to the control end of the switch tube Q1, and the anode is connected to the second signal input end STOPL.

[0024] In a preferred embodiment of the present invention, the first emergency stop protection signal includes an external power supply emergency stop protection input signal, and the second emergency stop protection signal includes a dry contact input signal.

[0025] When the external power supply emergency stop protection input signal indicates high impedance or disconnection of the external power supply, the voltage regulator Z1 is turned off. Therefore, the 5V power supply does not pass through the diode D2, resistor R3, and resistor R1 to turn on the switch Q1. Consequently, the switch Q1 is turned off, and the diode D2 is also turned off. This causes the power supply voltage (i.e., 5V) to appear across capacitor C2, and the first control signal is output, which is a high-level signal. The signal isolation unit 300 generates a high-level signal, i.e., a shutdown signal, based on the first control signal, thereby shutting down the charging system.

[0026] The external power supply emergency stop protection input signal indicates that when the external power supply is within the set voltage input range (for example, 9~15V), the circuit flow is as follows: Figure 5As shown, the voltage regulator Z1 breaks down, turning on the switch Q1 and the diode D2 turns off. Therefore, the voltage across capacitor C2 is approximately equal to the conduction voltage between the first and second terminals of the switch Q1, which is typically very small and generally considered to be less than a first set voltage, such as 0.3V. At this time, the second control signal is output across capacitor C2, where the second control signal is a low-level signal. The signal isolation unit 300 generates a low-level signal, i.e., an operating signal, based on the second control signal. This signal can control the normal operation of the charging system, or, in other words, deactivate the charging system to maintain its current operating state.

[0027] When the dry contact input signal indicates a dry contact disconnection, similar to the case where the external power supply emergency stop protection input signal indicates high impedance or disconnection of the external power supply, the voltage regulator Z1 is turned off. Therefore, the 5V power supply does not pass through the diode D2, resistor R3, and resistor R1 to turn on the switch Q1. As a result, the switch Q1 is turned off, and the diode D2 is also turned off. This causes the power supply voltage (i.e., 5V) to appear across capacitor C2, and the first control signal is output, which is a high-level signal. The signal isolation unit 300 generates a high-level signal, i.e., a shutdown signal, based on the first control signal, thereby controlling the charging system to shut down.

[0028] The dry contact input signal indicates that when the dry contact is closed, the circuit flow is as follows: Figure 4 As shown, the voltage regulator Z1 is turned off, thereby turning off the switch Q1 and conducting the diode D2. Therefore, the voltage across capacitor C2 is approximately equal to the conduction voltage of diode D2, which is typically very small and generally considered to be less than a first set voltage, such as 0.3V. At this time, the second control signal is output across capacitor C2, where the second control signal is a low-level signal. The signal isolation unit 300 generates a low-level signal, i.e., an operating signal, based on the second control signal. This allows the charging system to operate normally, or to maintain its current operating state without controlling the charging system.

[0029] By implementing the emergency stop protection circuit of the present invention, the same set of circuits and control processes can be used to receive and process two different emergency stop protection signals, thereby achieving emergency stop control of the charging system and reducing software and hardware costs.

[0030] In a further preferred embodiment of the present invention, a charging system is further provided, including a power module, a controller, and the emergency stop protection circuit; the controller is used to control the power module to work according to the working signal or to control the power module to stop working based on the shutdown signal.

[0031] Here, those skilled in the art can adopt any known charging system in the art and replace its emergency stop protection circuit with the emergency stop protection circuit of the present invention, which will not be described in detail here.

[0032] Although the present invention is described by way of specific embodiments, it will be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. Furthermore, various modifications may be made to the present invention for specific circumstances or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but is intended to encompass all embodiments falling within the scope of the claims.

[0033] 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 and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An emergency stop protection circuit, characterized in that: include: a first conducting unit, a second conducting unit and a signal isolation unit; The first conduction unit is used to receive a first emergency stop protection signal or a second emergency stop protection signal; The second conduction unit is also used to receive the first emergency stop protection signal or the second emergency stop protection signal; When the first emergency stop protection signal meets a first set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output a first control signal; When the first emergency stop protection signal meets a second set condition, the first conduction unit is turned on and the second conduction unit is turned off to output a second control signal; When the second emergency stop protection signal meets a third set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output the first control signal; When the second emergency stop protection signal meets a fourth setting condition, the first conduction unit is turned off and the second conduction unit is turned on to output the second control signal; The signal isolation unit is configured to receive the first control signal or the second control signal and generate a working signal based on the first control signal or generate a shutdown signal based on the second control signal.

2. The emergency stop protection circuit according to claim 1, characterized in that: The first conducting unit includes a voltage regulator tube, a first switch tube, a first resistor and a first capacitor; The cathode of the voltage regulator is connected to the first signal input end to receive the first emergency stop protection signal or the second emergency stop protection signal, and the anode is connected to the control end of the first switching tube through the first resistor. The first end of the first switching tube is connected to the third end of the second conduction unit, and the second end is connected to the second signal input end and the first end of the first capacitor. The second end of the first capacitor is connected to the input end of the signal isolation unit.

3. The emergency stop protection circuit according to claim 2, characterized in that: The second conduction unit includes a first diode, a second resistor and a third resistor. The cathode of the first diode is connected to the first signal input end to receive the first emergency stop protection signal or the second emergency stop protection signal, and the cathode is connected to the first end of the second resistor, the first end of the third resistor and the first end of the first switching tube; the second end of the second resistor is connected to the power supply, and the second end of the third resistor is connected to the input end of the signal isolation unit.

4. The emergency stop protection circuit according to claim 3, characterized in that: The first emergency stop protection signal includes an external power supply emergency stop protection input signal; When the first emergency stop protection signal meets a first set condition, the first conduction unit and the second conduction unit are simultaneously turned off to output a first control signal, including: When the external power supply emergency stop protection input signal indicates that the external power supply is high impedance or disconnected, the voltage regulator is turned off, thereby turning off the first switch tube, and the first diode is also turned off, so that the two ends of the first capacitor are at the power supply voltage, and then the first control signal is output, wherein the first control signal is a high-level signal.

5. The emergency stop protection circuit according to claim 3, characterized in that: The first emergency stop protection signal includes an external power supply emergency stop protection input signal; When the first emergency stop protection signal meets the second setting condition, the first conduction unit is turned on and the second conduction unit is turned off to output a second control signal, including: The external power supply emergency stop protection input signal indicates that when the external power supply is within the set voltage input range, the voltage regulator tube breaks down to turn on the first switch tube, and the first diode is cut off, so that the voltage across the first capacitor is less than the first set voltage, and then the second control signal is output, wherein the second control signal is a low-level signal.

6. The emergency stop protection circuit according to claim 3, characterized in that: The first emergency stop protection signal includes a dry contact input signal; When the second emergency stop protection signal satisfies a third setting condition, the first conduction unit and the second conduction unit are simultaneously turned off to output the first control signal, including: When the dry contact input signal indicates that the dry contact is disconnected, the voltage regulator is turned off, thereby turning off the first switch tube, and the first diode is also turned off, so that the two ends of the first capacitor are at the power supply voltage, and then the first control signal is output, wherein the first control signal is a high-level signal.

7. The emergency stop protection circuit according to claim 3, characterized in that: The first emergency stop protection signal includes a dry contact input signal; When the second emergency stop protection signal satisfies a fourth setting condition, the first conduction unit is turned off and the second conduction unit is turned on to output the second control signal, including: When the dry contact input signal indicates that the dry contact is closed, the voltage regulator is turned off, thereby turning off the first switch tube, and the first diode is turned on, so that the voltage across the first capacitor is less than the first set voltage, and then the second control signal is output, wherein the second control signal is a low-level signal.

8. The emergency stop protection circuit according to any one of claims 4 to 7, characterized in that: The signal isolation unit includes an optocoupler, a digital isolator or a shutdown coupler; the first switching tube includes a MOS tube, a triode or an IGBT tube; the first control signal is a high-level signal, and the second control signal is a low-level signal; the shutdown signal is a high-level signal, and the working signal is a low-level signal.

9. The emergency stop protection circuit according to any one of claims 1 to 7, characterized in that: further comprising a fourth resistor, a second capacitor, and a second diode; The first end of the fourth resistor is connected to the control end of the first switch tube, and the second end is connected to the second signal input end; the first end of the second capacitor is connected to the control end of the first switch tube, and the second end is connected to the second signal input end; the cathode of the second diode is connected to the control end of the first switch tube, and the anode is connected to the second signal input end.

10. A charging system comprising a power module, a controller, and the emergency stop protection circuit according to any one of claims 1 to 9; The controller is used to control the power module to operate based on the operating signal or to control the power module to stop operating based on the shutdown signal.

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