Anti-crosstalk circuit based on multi-split high-low side combined driving relay

Abstract

The utility model discloses an anti-crosstalk circuit based on a multi-split high-low side combined drive relay. The anti-crosstalk circuit comprises a power supply, a high-drive module, at least two relays and at least two low-drive modules. A common diode is arranged between a second end of a high-drive switch and a grounding end, the second end of the high-drive switch is connected with a first end of a relay, and a second end of the relay is grounded through a transient voltage suppression diode and a low-drive switch which are connected in parallel in a corresponding low-drive module, so that when the high-drive switch is switched off, the low-drive switch is switched off; the low voltage drop characteristic of a common diode can be utilized to clamp the voltage at the two ends of the relay below the preset voltage, and the preset voltage is far less than the minimum starting voltage driven by each relay, so that the relays of other paths cannot be started; and the condition of mutual crosstalk among the relays after the high-drive switch is switched off when one high-drive module is combined with a plurality of low-drive modules to drive a plurality of relays is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to relay drive technical field, specifically, relate to a kind of based on one drives many high-low edge joint drive relay's anti-interference circuit. BACKGROUND

[0002] Current one-way relay drive can be formed by self-assembly one-way high-drive module and one-way low-drive module series design, and relay is inductive load, therefore, the freewheeling design of relay is needed.

[0003] Figure 1 For the structure diagram of relay freewheeling in prior art, currently, the mode of relay freewheeling as shown in Figure 1 When high-drive switch is disconnected, relay 1 inductive load current does not disappear immediately, but reverse electromotive force is generated at the both ends of relay 1, so a negative voltage is generated at V1, assuming that input power supply is 12V, TVS (Transient Voltage Suppressor) VBR (Reverse Breakdown Voltage) is 33V-37V, and VCL (Clamping voltage) is 48V, then the voltage at V1 is-36V-21V, normal freewheeling circuit is from relay 1→low-drive module 1→TVS.

[0004] But when one high-drive module jointly drives multiple low-drive modules (2 or more) to drive multiple relays, i.e., one drives many high-low edge joint drive relays, due to the existence of low-drive module 2 and relay 2, another freewheeling circuit will be generated: ground→low-drive module 2→relay 2, the voltage on relay 2 at this time is 0-V1, about 21-36V, greater than the minimum opening voltage 9V of relay 2, so it will cause relay 1 to be disconnected, but relay 2 will be turned on for a period of time and then disconnected, so that cross-talk occurs between each relay.

[0005] That is, when one high-drive module jointly drives multiple low-drive modules to drive multiple relays, each relay will interfere with each other after high-drive switch is disconnected. INVENTION CONTENTS

[0006] The utility model provides a kind of based on one drives many high-low edge joint drive relay's anti-interference circuit to avoid the occurrence of the situation that each relay interferes with each other when one high-drive module jointly drives multiple low-drive modules to drive multiple relays after high-drive switch is disconnected. The specific technical solutions are as follows:

[0007] In the first aspect, the utility model provides a kind of based on one drives many high-low edge joint drive relay's anti-interference circuit, comprising:

[0008] a power supply, a high drive module, at least two relays and at least two low drive modules, the high drive module comprising a high drive switch and a common diode, the low drive module comprising a low drive switch and a transient voltage suppression diode in parallel, wherein the relays correspond to the low drive modules one by one and have the same number;

[0009] a first end of the high drive switch is connected to a positive pole of the power supply, a second end of the high drive switch is connected to a negative pole of the common diode and a first end of the relay respectively, and a positive pole of the common diode and a negative pole of the power supply are grounded;

[0010] a second end of the relay is grounded through the transient voltage suppression diode and the low drive switch in the corresponding low drive module.

[0011] Optionally, the high drive module is a single-channel intelligent high drive chip with a metal-oxide semiconductor field effect transistor integrated inside.

[0012] Optionally, the high drive module further comprises a first diagnostic and feedback back sampling circuit, and the first diagnostic and feedback back sampling circuit is connected to the second end of the high drive switch.

[0013] Optionally, the low drive module further comprises a second diagnostic and feedback back sampling circuit, and the second diagnostic and feedback back sampling circuit is connected to the low drive switch.

[0014] Optionally, the number of the relays and the low drive modules is two.

[0015] Optionally, the minimum opening voltage of the relay is 9V.

[0016] Optionally, the output voltage of the high drive module is 12V.

[0017] Optionally, the clamping voltage of the common diode is 1.25V.

[0018] Optionally, the reverse breakdown voltage of the transient voltage suppression diode is 33V-37V, and the clamping voltage of the transient voltage suppression diode is 48V.

[0019] Optionally, the output voltage of the power supply is 12V.

[0020] According to the above, the anti-crosstalk circuit based on the one-to-many high-low edge combined driving relay provided in the embodiment comprises a power supply, a high driving module, at least two relays, and at least two low driving modules. The high driving module comprises a high driving switch and a common diode, and the low driving module comprises a low driving switch and a transient voltage suppression diode in parallel. The relays correspond to the low driving modules one by one and have the same number. The first end of the high driving switch is connected to the positive pole of the power supply, the second end of the high driving switch is connected to the negative pole of the common diode and the first end of the relay respectively, and the positive pole of the common diode and the negative pole of the power supply are grounded. The second end of the relay is grounded through the transient voltage suppression diode and the low driving switch in the corresponding low driving module. In this way, by arranging the common diode between the second end of the high driving switch and the ground end, connecting the second end of the high driving switch to the first end of the relay, and grounding the second end of the relay through the transient voltage suppression diode and the low driving switch in the corresponding low driving module in parallel, when the high driving switch is turned off, the voltage across the relay can be clamped below the preset voltage by using the low-voltage drop characteristic of the common diode, and the preset voltage is much higher than the minimum opening voltage of the relay drive, so the relays on other paths will not be turned on, and the mutual crosstalk between the relays after the high driving switch is turned off when one high driving module drives multiple low driving modules to drive multiple relays is avoided.

[0021] The innovation points of the embodiments of the utility model include:

[0022] 1. By arranging the common diode between the second end of the high driving switch and the ground end, connecting the second end of the high driving switch to the first end of the relay, and grounding the second end of the relay through the transient voltage suppression diode and the low driving switch in the corresponding low driving module in parallel, when the high driving switch is turned off, the voltage across the relay can be clamped below the preset voltage by using the low-voltage drop characteristic of the common diode, and the preset voltage is much smaller than the minimum opening voltage of each relay drive, so the relays on other paths will not be turned on, and the mutual crosstalk between the relays after the high driving switch is turned off when one high driving module drives multiple low driving modules to drive multiple relays is avoided.

[0023] 2. By arranging the transient voltage suppression diode and the low driving switch in parallel, when the low driving switch is suddenly turned off, the transient energy on the turned-off relay cannot suddenly change but is discharged through the path of the transient voltage suppression diode to the ground.

[0024] 3. The output of the high driving module is judged by the first diagnosis and feedback back sampling circuit.

[0025] 4. The output of the low driving module is judged by the second diagnosis and feedback back sampling circuit.

[0026] Of course, implementing any product or method of the present application does not necessarily need to achieve all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some of the embodiments of the present application. For those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 A structure diagram of the relay freewheeling in the prior art;

[0029] Figure 2 A structure diagram of the anti-crosstalk circuit based on the one-to-many high-low edge combined driving relay provided by the embodiment of the present application;

[0030] Figure 3 A structure diagram of the high drive module provided by the present application;

[0031] Figure 4 A structure diagram of the low drive module provided by the present application.

[0032] Figures 2-4 In the figure, 1 is a power supply, 2 is a high drive module, 21 is a high drive switch, 22 is a common diode, 23 is a first diagnosis and feedback back sampling circuit, 3 is a relay, 4 is a low drive module, 41 is a low drive switch, 42 is a TVS, and 43 is a second diagnosis and feedback back sampling circuit. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0034] It should be noted that the terms "include" and "have" and any variations thereof in the embodiments of the present application and the drawings are intended to cover non-exclusive inclusion. For example, the processes, methods, systems, products or devices including a series of steps or units are not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to these processes, methods, products or devices.

[0035] The utility model discloses a kind of anti-crosstalk circuits of one-to-many high-low edge combined driving relay based on, can avoid when a high drive module combined multiple low drive modules drive multiple relays, the occurrence of the situation of mutual crosstalk between each relay after high drive switch is disconnected. The utility model embodiment is described in detail below.

[0036] Figure 2 A structure schematic diagram of one kind of anti-crosstalk circuits of one-to-many high-low edge combined driving relay based on provided for the utility model embodiment.

[0037] Referring to Figure 2 The utility model embodiment provides a kind of anti-crosstalk circuits of one-to-many high-low edge combined driving relay based on including power supply 1, high drive module 2 and at least two relays 3 and at least two low drive modules 4, illustratively, the output voltage of power supply 1 is 12V, the output voltage of high drive module 2 is 12V, the minimum opening voltage of relay 3 is 9V.

[0038] Continue to refer to Figure 2 High drive module 2 includes high drive switch 21 and ordinary diode 22, illustratively, high drive module 2 can be single-channel intelligent high drive chip that MOS (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide semiconductor field-effect transistor) is integrated inside, illustratively, the VCL (Clamping voltage, clamping voltage) of ordinary diode 22 is 1.25V.

[0039] Figure 3 The structure schematic diagram of high drive module 2 provided for the utility model, referring to Figure 3 High drive module 2 also includes first diagnosis and feedback back sampling circuit 23, that is, part B, first diagnosis and feedback back sampling circuit 23 is connected with the second end of high drive switch 21, first diagnosis and feedback back sampling circuit 23 is used to judge whether the output of high drive module 2 is normal by sampling value, for example, the output voltage of power supply 1 is 12V, if sampling value is also 12V, then judge the output of high drive module 2 is normal.

[0040] Therefore, the output of high drive module 2 is judged by the mode of setting first diagnosis and feedback back sampling circuit 23.

[0041] Continue to refer to Figure 3, A part is the power input and enable control unit of the high drive module 2, which is used for controlling the opening and closing of the MOS, thereby controlling the output of the high drive module 2, for example: if the power input and enable control unit controls the MOS to open, at this time, the high drive switch 21 is closed, and the high drive module 2 outputs, on the contrary, the power input and enable control unit controls the MOS to close, at this time, the high drive switch 21 is disconnected, and the high drive module 2 does not output.

[0042] Continuing to refer to Figure 2 Each low drive module 4 comprises a low drive switch 41 and a transient voltage suppressor diode 42 in parallel, wherein the relay 3 and the low drive module 4 are one-to-one corresponding and the number is same.

[0043] Figure 4 The low drive module 4 provided by the utility model provides a structural schematic diagram, referring to Figure 4 The low drive module 4 can be composed of a MOS and a peripheral self-made output circuit, and the low drive module 4 further comprises a second diagnosis and feedback back sampling circuit 43, that is, E part, and the second diagnosis and feedback back sampling circuit 43 is connected with the low drive switch 41.

[0044] Therefore, the second diagnosis and feedback back sampling circuit 43 is arranged to judge whether the output of the low drive module 4 is normal.

[0045] Continuing to refer to Figure 4 D part is the enable control unit of the low drive module 4, which is used for controlling the opening and closing of the MOS, thereby controlling the output of the low drive module 4, for example: if the enable control unit controls the MOS to open, at this time, the low drive switch 41 is closed, and the low drive module 4 outputs, on the contrary, the enable control unit controls the MOS to close, at this time, the low drive switch 41 is disconnected, and the low drive module 4 does not output.

[0046] Continuing to refer to Figure 2The first end of the high drive switch 21 is connected with the positive pole of the power supply 1, the second end of the high drive switch 21 is connected with the negative pole of the common diode 22 and the first end of the relay 3 respectively, the positive pole of the common diode 22 and the negative pole of the power supply 1 are grounded, and the clamping voltage of the common diode 22 is 1.25V, the VBR (Reverse Breakdown Voltage) of the TVS 42 is 33V-37V, the VCL (Clamping voltage) of the TVS 42 is 48V, the first end of the high drive switch 21 is the front end, and the second end of the high drive switch 21 is the rear end.

[0047] Continuing to refer to Figure 2 The second end of the relay 3 is grounded through the TVS 42 and the low drive switch 41 in the corresponding low drive module 4.

[0048] For the convenience of understanding, the working principle of the anti-crosstalk circuit based on the one-to-many high-low edge combined drive relay provided by the utility model is introduced below, for the convenience of introduction, it is assumed that the number of the relay 3 and the low drive module 4 is 2, and the case of multiple is similar, continuing to refer to Figure 2 :

[0049] 1, a high drive module 2 and multiple low drive modules 4 normally output, and jointly drive each relay 3 to normally work, only one relay 3 works at the same time, Figure 2 The relay 3 close to the common diode 22 works;

[0050] 2, when the high drive switch 21 is suddenly turned off, the relay 3 is an inductive load, the current will not disappear immediately, and a reverse electromotive force will be generated at the two ends of the disconnected relay 3, since the common diode 22 is reversely connected between the high drive switch 21 and the ground end, therefore, the freewheeling circuit becomes the ground end→common diode 22 as shown in Figure 2 The low voltage drop characteristic of the common diode 22 can clamp the voltage at the two ends of the relay 3 below the preset voltage, and the preset voltage is much smaller than the minimum opening voltage of the relay 3 drive, and the minimum opening voltage of the relay 3 drive is generally 9V, so it will not affect other relay 3 being crosstalked, Figure 2 The cross indicates that there is no other freewheeling circuit, and the preset voltage is 2V.

[0051] 3、When the low drive switch 41 is suddenly turned off, the relay 3 is an inductive load, the current will not disappear immediately, and a reverse electromotive force will be generated at both ends of the disconnected relay 3. Since the TVS 42 is connected in parallel with the low drive switch 41, assuming that the output voltage of the high drive module 2 is 12V, the VBR of the TVS 42 is 33V-37V, and the VCL is 48V, the voltage at the D pole of the low drive switch 41 is 33V-48V, so that the transient energy on the disconnected relay 3 cannot suddenly change but is discharged through the path of the TVS 42 to the ground, wherein D is drain, that is, the drain pole.

[0052] Therefore, by connecting the transient voltage suppression diode TVS 42 in parallel with the low drive switch 41, the transient energy on the disconnected relay 3 cannot suddenly change but is discharged through the path of the transient voltage suppression diode TVS 42 to the ground when the low drive switch 41 is suddenly turned off.

[0053] As can be seen from the above, the anti-crosstalk circuit based on the one-to-many high-low edge combined drive relay provided by the embodiment of the present application comprises a power supply 1, a high drive module 2, at least two relays 3, and at least two low drive modules 4. The high drive module 2 comprises a high drive switch 21 and a common diode 22, and each low drive module 4 comprises a low drive switch 41 and a transient voltage suppression diode TVS 42 connected in parallel, wherein the relays 3 and the low drive modules 4 are one-to-one corresponding and have the same number. The first end of the high drive switch 21 is connected with the positive pole of the power supply 1, the second end of the high drive switch 21 is connected with the negative pole of the common diode 22 and the first end of the relay 3 respectively, and the positive pole of the common diode 22 and the negative pole of the power supply 1 are both grounded; the second end of the relay 3 is grounded through the TVS 42 and the low drive switch 41 in the corresponding low drive module 4 respectively. Therefore, by connecting the common diode 22 between the second end of the high drive switch 21 and the ground, connecting the second end of the high drive switch 21 with the first end of the relay 3, and grounding the second end of the relay 3 through the TVS 42 and the low drive switch 41 connected in parallel in the corresponding low drive module 4, when the high drive switch 21 is turned off, the voltage at both ends of the relay 3 can be clamped below the preset voltage by using the low-voltage drop characteristic of the common diode 22, and the preset voltage is much smaller than the minimum opening voltage of the relay 3, so that the other relays 3 will not be turned on, thereby avoiding the occurrence of the crosstalk between the relays when one high drive module is combined with multiple low drive modules to drive multiple relays.

[0054] Those skilled in the art can understand that the modules or processes in the drawings are not necessarily necessary for the implementation of the present application.

[0055] Those skilled in the art can understand that the modules in the device in the embodiments can be distributed in the device in the embodiments as described in the embodiments, or can be changed to be located in one or more devices different from the embodiments. The modules in the above embodiments can be combined into one module, or can be further split into multiple sub-modules.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A kind of anti-crosstalk circuit based on one drag many high-low edge combined drive relay, it is characterized in that, The application relates to a power supply, a high-drive module and at least two relays and at least two low-drive modules, wherein the high-drive module comprises a high-drive switch and a common diode, the low-drive module comprises a low-drive switch and a transient voltage suppression diode in parallel, the relays correspond to the low-drive modules one by one and have the same number as the low-drive modules. The first end of the high-drive switch is connected with the positive pole of the power supply, the second end of the high-drive switch is connected with the negative pole of the common diode and the first end of the relay respectively, and the positive pole of the common diode and the negative pole of the power supply are grounded. The second end of the relay is grounded through the transient voltage suppression diode and the low-drive switch in the corresponding low-drive module. The high-drive module is a single-channel intelligent high-drive chip internally integrated with a metal-oxide semiconductor field effect transistor.

2. The anti-crosstalk circuit based on the multi-in-one high-low edge combined drive relay of claim 1, wherein, The high-drive module further comprises a first diagnosis and feedback back sampling circuit connected with the second end of the high-drive switch.

3. The anti-cross talk circuit of the multi-split high-low combined drive relay of claim 2, wherein the first capacitor is connected between the first node and the second node. The low-drive module further comprises a second diagnosis and feedback back sampling circuit connected with the low-drive switch.

4. The anti-cross-talk circuit of a multi-split high-low combined drive relay of claim 1, wherein, The number of the relays and the low-drive modules is two.

5. The anti-cross-talk circuit of a multi-split high-low combined drive relay of claim 1, wherein the first capacitor (C1) is connected between the first node (N1) and the second node (N2). The minimum opening voltage of the relay is 9V.

6. The anti-cross-talk circuit of a multi-split high-low combined drive relay of claim 1, wherein the first capacitor (C1) is connected between the first node (N1) and the second node (N2). The output voltage of the high-drive module is 12V.

7. The anti-cross-talk circuit of a multi-split high-low combined drive relay of claim 1, wherein the first capacitor (C1) is connected between the first node (N1) and the second node (N2). The clamping voltage of the common diode is 1.25V.

8. The anti-cross-talk circuit of a multi-split high-low combined drive relay of claim 1, wherein, The reverse breakdown voltage of the transient voltage suppression diode is 33V-37V, and the clamping voltage of the transient voltage suppression diode is 48V.

9. The anti-cross-talk circuit of a multi-split high-low combined drive relay of claim 1, wherein, The output voltage of the power supply is 12V.

10. The anti-cross-talk circuit of a multi-split high-low combined drive relay of claim 1, wherein, ​

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