A switching circuit for EFO high-voltage ignition and low-voltage detection

Abstract

This application provides a switching circuit for EFO high-voltage ignition and low-voltage detection, including a drive circuit and a reed relay. The drive circuit includes a drive resistor and a current control element. The input terminal of the current control element is connected to the CTRL signal terminal, and the output terminal of the current control element is connected to the input terminal of the reed relay. The reed relay includes a switch, which, driven by the drive circuit, is used to switch between the high-voltage ignition terminal and the low-voltage detection terminal. This invention, through the design of the drive circuit and the reed relay, achieves free switching between the high-voltage ignition terminal and the low-voltage detection terminal, with good switching effect, eliminating the need for a mercury relay and significantly saving costs.

Description

Technical Field

[0001] This application relates to the field of electronic circuits, and more particularly to a switching circuit for EFO high-voltage arcing and low-voltage detection. Background Technology

[0002] Before bonding, the wire bonding machine needs to burn a gold ball into the gold wire under high voltage. After the first and second bonding are completed, the system needs to switch to the low-voltage detection signal terminal to detect the welding quality of the first and second bonding gold wires.

[0003] Currently, mercury relays are used for switching between high-voltage and low-voltage detection signal terminals. However, due to environmental protection requirements, the production of many mercury products has been banned recently, leading to increasingly higher prices for both imported and domestically produced mercury relays. It is even possible that production of these relays will cease in the future. Therefore, it is necessary to improve the switching technology for high-voltage to low-voltage detection signal terminals and find a cost-effective solution.

[0004] Based on this, the present invention designs a switching circuit for EFO high-voltage ignition and low-voltage detection to solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a switching circuit for EFO high-voltage arcing and low-voltage detection, which can solve the problem of switching from high voltage to low voltage detection signal during the bonding process of wire bonding machine, replace mercury relay, and greatly reduce overall cost.

[0006] To solve the above-mentioned technical problems, the technical solution of this application is as follows:

[0007] An EFO high-voltage ignition and low-voltage detection switching circuit includes at least one drive circuit and one reed relay.

[0008] The driving circuit includes a driving resistor and a current control element;

[0009] The input terminal of the current control element is connected to the CTRL signal terminal, and the output terminal of the current control element is connected to the first input pin of the reed relay.

[0010] The reed relay includes a switch, which, under the drive of the driving circuit, is used to select whether to connect the high-voltage ignition terminal or the low-voltage detection terminal.

[0011] When the CTRL signal terminal outputs a high-voltage ignition control signal to the drive circuit, the drive circuit controls the switch to connect the high-voltage ignition terminal.

[0012] When the CTRL signal terminal outputs a low-voltage detection control signal to the drive circuit, the drive circuit controls the switch to connect the low-voltage detection terminal.

[0013] Specifically, the current control element is a transistor or a field-effect transistor, and the switch is a single-pole double-throw switch.

[0014] Specifically, the third pin of the reed relay is connected to the power supply VCC.

[0015] Specifically, the eighth pin of the reed relay is connected to the WIRESPOOL signal terminal.

[0016] On the other hand, the reed relay has a built-in diode and coil.

[0017] Specifically, the driving circuit includes a first driving circuit and a second driving circuit, and the reed relay includes a first reed relay and a second reed relay. The first driving circuit and the first reed relay are connected in series to form a first circuit branch, and the second driving circuit and the second reed relay are connected in series to form a second circuit branch. The first circuit branch and the second circuit branch are connected in parallel.

[0018] Specifically, the input ports of both the first driving circuit and the second driving circuit are connected to the CTRL signal terminal.

[0019] Specifically, the first reed relay is a normally open switch, and the second reed relay is a normally open switch.

[0020] Specifically, when the CTRL signal terminal outputs a high-voltage ignition control signal to the second drive circuit, the second drive circuit triggers the second reed relay to close and connect to the HV high-voltage ignition terminal.

[0021] When the CTRL signal terminal outputs a low-voltage detection control signal to the first drive circuit, the first drive circuit triggers the first reed relay to close and connect to the LV_CHECK low-voltage detection terminal.

[0022] In another embodiment, the driving circuit includes a first driving circuit, and the reed relay includes a first reed relay and a second reed relay. The first driving circuit is connected in series after the first reed relay and the second reed relay are connected in parallel.

[0023] The input port of the first driving circuit is connected to the CTRL signal terminal.

[0024] Specifically, when the CTRL signal terminal outputs a high-voltage ignition control signal to the second drive circuit, the second drive circuit triggers the switch of the second reed relay to connect with the HV high-voltage ignition terminal; when the CTRL signal terminal outputs a low-voltage detection control signal to the first drive circuit, the first drive circuit triggers the first reed relay to connect with the low-voltage detection terminal.

[0025] Compared with the prior art, the present invention designs a driving circuit and a reed relay. The driving circuit can drive the switch in the reed relay to switch between the high-voltage ignition end and the low-voltage detection end under different signal triggers, so as to realize the free switching between the high-voltage ignition end and the low-voltage detection end. The switching effect is good, and there is no need to use a mercury relay, which greatly saves costs. Attached Figure Description

[0026] The accompanying drawings, which are provided to further illustrate this application and constitute a component of it, are used to explain the application and do not constitute an undue limitation thereof. Some specific embodiments of the application will be described in detail below with reference to the accompanying drawings in an exemplary and non-limiting manner. The same reference numerals in the drawings denote the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale.

[0027] Figure 1 This is a circuit diagram of a first embodiment of the switching circuit for EFO high-voltage ignition and low-voltage detection according to the present invention.

[0028] Figure 2 This is a circuit diagram of a second embodiment of the switching circuit for EFO high-voltage ignition and low-voltage detection according to the present invention.

[0029] Figure 3 This is a circuit diagram of a third embodiment of the switching circuit for EFO high-voltage ignition and low-voltage detection according to the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely embodiments of one component of the present application, and not embodiments of the entire application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort should fall within the scope of protection of the present application.

[0031] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0032] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] The following embodiments of this application use a switching circuit for EFO high-voltage ignition and low-voltage detection as an example to illustrate the solution of this application in detail. However, this embodiment does not limit the scope of protection of this application.

[0035] Example 1

[0036] like Figure 1 As shown, an EFO (Electronic Fire Off) high-voltage ignition and low-voltage detection switching circuit includes at least one drive circuit and one reed relay.

[0037] The driving circuit includes a driving resistor and a current control element Q1, with the two ends of the driving resistor connected to the two pins of the current control element Q1.

[0038] The input terminal of the current control element Q1 is connected to the CTRL signal terminal, and the output terminal is connected to the input terminal of the reed relay.

[0039] The current control element Q1 can be a transistor or a field-effect transistor.

[0040] The reed relay is an SPDT relay, which includes a switch K1. The switch K1 is used to select whether to connect the high-voltage ignition terminal HV or the low-voltage detection terminal LV_CHECK under the drive of the drive circuit.

[0041] Specifically, when the CTRL signal terminal outputs a high-voltage ignition control signal to the drive circuit, the drive circuit controls the switch K1 to connect the high-voltage ignition terminal HV.

[0042] When the CTRL signal terminal outputs a low-voltage detection control signal to the drive circuit, the drive circuit controls the switch K1 to connect the low-voltage detection terminal LV_CHECK.

[0043] The switch K1 is a single-pole double-throw switch. The third pin of the reed relay is connected to the power supply VCC to provide power to the relay. The eighth pin of the reed relay is connected to the WIRESPOOL signal terminal. The main function of the WIRESPOOL signal terminal is to connect the gold wire circuit to perform high-voltage arcing on the gold wire and to apply a low-voltage detection signal for welding quality detection through the gold wire circuit.

[0044] On the other hand, the reed relay also has a built-in diode D2 and coil L1. The diode D2 and the coil are connected in parallel. In this embodiment, a diode D1 is also connected outside the reed relay. The model of D1 is MMSD4148. The diode D1 is connected in parallel across the two ends of the diode D2.

[0045] The high-voltage ignition control signal and low-voltage detection control signal sent from the CTRL signal terminal are both control commands issued by the system's main control unit.

[0046] Example 2

[0047] like Figure 2 As shown, the difference between this embodiment and Embodiment 1 is that both the drive circuit and the reed relay are provided in two forms. The drive circuit includes a first drive circuit and a second drive circuit, and the reed relay includes a first reed relay and a second reed relay. The first drive circuit and the first reed relay are connected in series to form a first circuit branch, and the second drive circuit and the second reed relay are connected in series to form a second circuit branch. The first circuit branch and the second circuit branch are connected in parallel.

[0048] Specifically, the input ports of both the first and second drive circuits are connected to the CTRL signal terminal. The switch K1 of the first reed relay is a normally open switch, and the switch K2 of the second reed relay is a normally open switch.

[0049] Specifically, when the CTRL signal terminal outputs a high-voltage ignition control signal to the second drive circuit, the second drive circuit triggers the second reed relay switch K2 to close and connect with the high-voltage ignition terminal HV, and the normally open contact of the reed relay K1 does not operate.

[0050] When the CTRL signal terminal outputs a low-voltage detection control signal to the first drive circuit, the first drive circuit triggers the first reed relay switch K1 to close and connect with the low-voltage detection terminal LV_CHECK, while the normally open contact of the reed relay K2 does not operate.

[0051] In this solution, the high-voltage ignition end and the low-voltage detection end can also be switched by triggering the reed relay through the signal of the drive circuit.

[0052] Example 3

[0053] The difference between this implementation and Embodiment 1 and Embodiment 2 is that the driving circuit includes one driving circuit and the reed relay includes two reed relays.

[0054] The driving circuit includes a first driving circuit, and the reed relay includes a first reed relay and a second reed relay. The first reed relay and the second reed relay are connected in parallel and then connected in series with the first driving circuit. The input port of the first driving circuit is connected to the CTRL signal terminal.

[0055] Specifically, when the CTRL signal terminal outputs a high-voltage ignition control signal to the second drive circuit, the second drive circuit triggers the switch K2 of the second reed relay to connect with the HV high-voltage ignition terminal, and the normally open contact of the reed relay K1 does not operate; when the CTRL signal terminal outputs a low-voltage detection control signal to the first drive circuit, the first drive circuit triggers the switch K1 of the first reed relay to connect with the low-voltage detection terminal LV_CHECK, and the normally closed contact of K2 disconnects from the connection with the high-voltage ignition terminal HV. In this embodiment, the switch K2 of the second reed relay is a normally closed switch, and the switch K1 of the first reed relay is a normally open switch.

[0056] Compared with the prior art, the present invention designs a driving circuit and a reed relay. The driving circuit can drive the switch in the reed relay to switch between the high-voltage ignition end and the low-voltage detection end under different signal triggers, so as to realize the free switching between the high-voltage ignition end and the low-voltage detection end. The switching effect is good, and there is no need to use a mercury relay, which greatly saves costs.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to the component or whole component technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A switching circuit for EFO high-voltage ignition and low-voltage detection, characterized in that, It includes at least one drive circuit and one reed relay. The driving circuit includes a driving resistor and a current control element; The input terminal of the current control element is connected to the CTRL signal terminal, and the output terminal of the current control element is connected to the input terminal of the reed relay. The reed relay includes a switch, which, under the drive of the driving circuit, is used to switch between a high-voltage ignition terminal and a low-voltage detection terminal. When the CTRL signal terminal outputs a high-voltage ignition control signal to the drive circuit, the drive circuit controls the switch to connect the high-voltage ignition terminal. When the CTRL signal terminal outputs a low-voltage detection control signal to the drive circuit, the drive circuit controls the switch to connect the low-voltage detection terminal. The reed relay is an SPDT relay, which includes a switch K1. The switch K1 is a single-pole double-throw switch. The third pin of the reed relay is connected to the power supply VCC to provide power to the relay. The eighth pin of the reed relay is connected to the WIRESPOOL signal terminal. The function of the WIRESPOOL signal terminal is to connect the gold wire circuit to perform high-voltage arcing on the gold wire and to apply a low-voltage detection signal for welding quality detection through the gold wire circuit. The reed relay also has a built-in diode D2 and a coil L1, which are connected in parallel. A diode D1, model MMSD4148, is also connected externally to the reed relay and is connected in parallel across the diode D2.

2. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in claim 1, characterized in that, The current control element is a transistor or a field-effect transistor; the switch is a single-pole double-throw switch.

3. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in claim 1, characterized in that, The third pin of the reed relay is connected to the power supply VCC.

4. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in claim 1, characterized in that, The eighth pin of the reed relay is connected to the WIRESPOOL signal terminal.

5. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in claim 1, characterized in that, The reed relay has a built-in diode and coil, which are connected in parallel.

6. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in any one of claims 1, 3, 4, or 5, characterized in that, The driving circuit includes a first driving circuit and a second driving circuit, and the reed relay includes a first reed relay and a second reed relay. The first driving circuit and the first reed relay are connected in series to form a first circuit branch, and the second driving circuit and the second reed relay are connected in series to form a second circuit branch. The first circuit branch and the second circuit branch are connected in parallel. The input ports of both the first and second driving circuits are connected to the CTRL signal terminal.

7. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in claim 6, characterized in that, The first reed relay is a normally open switch, and the second reed relay is a normally open switch.

8. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in claim 7, characterized in that, When the CTRL signal terminal outputs a high-voltage ignition control signal to the second drive circuit, the second drive circuit triggers the second reed relay switch to close and connect with the high-voltage ignition terminal. When the CTRL signal terminal outputs a low-voltage detection control signal to the first drive circuit, the first drive circuit triggers the first reed relay to close and connect to the low-voltage detection terminal.

9. A switching circuit for EFO high-voltage ignition and low-voltage detection as described in any one of claims 1, 3, 4, or 5, characterized in that, The driving circuit includes a first driving circuit, and the reed relay includes a first reed relay and a second reed relay. The first reed relay and the second reed relay are connected in parallel, and the first driving circuit is connected in series. The input port of the first driving circuit is connected to the CTRL signal terminal.

10. The switching circuit for EFO high-voltage ignition and low-voltage detection as described in claim 9, characterized in that, When the CTRL signal terminal outputs a high-voltage ignition control signal to the second drive circuit, the second drive circuit triggers the switch of the second reed relay to connect with the high-voltage ignition terminal; when the CTRL signal terminal outputs a low-voltage detection control signal to the first drive circuit, the first drive circuit triggers the first reed relay to connect with the low-voltage detection terminal.

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