Isolation interlocking protection control circuit
By designing an isolation interlock protection control circuit using ordinary-specific devices, the problem of difficulty in taking into account both cost and reliability in the prior art is solved, and the isolation interlock protection effect of low-cost, high reliability and high safety is achieved.
Patent Information
- Application Number
- CN202421855841.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The existing trigger interlock circuit is difficult to take into account between cost and reliability. The circuit composed of transistors is low but the reliability is low, while the circuit composed of flip-flops or microcontrollers is high but the reliability is high.
An isolation interlock protection control circuit is designed, using ordinary devices such as resistors, transistors, optocouplers and diodes. The isolation and interlock protection are achieved through a simple circuit structure to reduce component costs.
It realizes an isolation and interlocking protection control circuit with simple structure and low cost of components, enhances the safety of the product, and is highly reliable, and is suitable for industrial applications.
Smart Images
Figure CN222882959U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electronic technology, in particular to an isolation interlocking protection control circuit. Background Art
[0002] At present, the trigger interlock circuit is mainly realized by transistors, triggers or single-chip microcomputers (CPU). The trigger interlock circuit composed of transistors has low cost, but large temperature drift and low reliability; the trigger interlock circuit composed of triggers or single-chip microcomputers (CPU) has small temperature drift and high reliability, but high cost. Utility Model Content
[0003] In order to make up for the deficiencies of the prior art, the embodiments of the present application propose an isolation interlock protection control circuit to solve the problems mentioned in the prior art.
[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0005] An isolation interlocking protection control circuit comprises a resistor R1, a resistor R2, a resistor R3, a transistor Q1, a transistor Q2, an optocoupler OC1 and a diode D1, wherein one end of the resistor R1 is connected to the emitter of the transistor Q1, the C pin of the optocoupler OC1 and a power supply VCC, the other end of the resistor R1 is connected to the resistor R3 and the base of the transistor Q1, the other end of the resistor R3 is connected to the cathode of the diode D1 and the collector of the transistor Q2, the base of the transistor Q2 is connected to the resistor R4, the resistor R5 and the resistor R7, the other end of the resistor R4 is connected to the collector of the transistor Q1, the other end of the resistor R7 is connected to the resistor R6 and the emitter of the transistor Q2, the other end of the resistor R5 is connected to the other end of the resistor R6 and the E pin of the optocoupler OC1, the A pin of the optocoupler OC1 is connected to the resistor R2, the K pin of the optocoupler OC1 is grounded, the anode of the diode D1 is connected to a COM signal, and the other end of the resistor R2 is connected to a protection signal OPT.
[0006] As a further technical solution of the utility model: the transistor Q1 is a PNP transistor.
[0007] As a further technical solution of the utility model: the transistor Q1 is an NPN transistor.
[0008] As a further technical solution of the utility model: the diode D1 is a voltage stabilizing diode.
[0009] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: the isolation interlocking protection control circuit of the utility model has a simple structure, low-cost components, and all ordinary conventional devices are used, which can increase the safety of the product. Isolation + interlocking protection enhances the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 The utility model provides an isolation interlock protection control circuit schematic. DETAILED DESCRIPTION
[0011] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0012] Reference Figure 1 An isolation interlock protection control circuit includes a resistor R1, a resistor R2, a resistor R3, a transistor Q1, a transistor Q2, an optocoupler OC1 and a diode D1, one end of the resistor R1 is connected to the emitter of the transistor Q1, the C pin of the optocoupler OC1 and the power supply VCC, the other end of the resistor R1 is connected to the resistor R3 and the base of the transistor Q1, the other end of the resistor R3 is connected to the cathode of the diode D1 and the collector of the transistor Q2, the base of the transistor Q2 is connected to the resistor R4, the resistor R5 and the resistor R7, the other end of the resistor R4 is connected to the collector of the transistor Q1, the other end of the resistor R7 is connected to the resistor R6 and the emitter of the transistor Q2, the other end of the resistor R5 is connected to the other end of the resistor R6 and the E pin of the optocoupler OC1, the A pin of the optocoupler OC1 is connected to the resistor R2, the K pin of the optocoupler OC1 is grounded, the anode of the diode D1 is connected to the COM signal, and the other end of the resistor R2 is connected to the protection signal OPT.
[0013] Here’s how it works:
[0014] When the protection signal OPT terminal gives a high level, through the resistor R2, the AK pin in the isolation optocoupler OC1 is turned on, and the CE pin in the isolation optocoupler OC1 is turned on. VCC gives a base current to the NPN transistor Q2 through the resistor R5, so that the NPN transistor Q2 is turned on and enters the saturation state, and the COM signal is pulled to a low level by the NPN transistor Q2. The NPN transistor Q2 also controls the conduction of the PNP transistor Q1. When the NPN transistor Q2 is turned on, the base current of the PNP transistor Q1 reaches the ground through R3, the PNP transistor Q1 is turned on, and another base current is provided to the NPN transistor Q2 through the resistor R4, maintaining the conduction of the NPN transistor Q2. The PNP transistor Q1 and the resistors R1, R4, and R4 constitute the positive feedback circuit of the NPN transistor Q2.
[0015] As long as the OPT signal has a high level, the interlock circuit at the isolation end can always lock COM to a low level unless the VCC voltage is powered off and reset.
[0016] The components selected for the entire circuit are low-cost, and all ordinary conventional devices are used, with considerable economic benefits, good versatility and timeliness, high reliability, and industrial advantages. The selected devices and materials are all universal parts, and the industrialization of the circuit is easy to achieve. This circuit has been verified by a series of tests, and the circuit consistency is very good, which is of promotion significance.
[0017] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.
[0018] In addition, it should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation modes that are easy for those skilled in the art to understand.
Claims
1. An isolation interlock protection control circuit, comprising a resistor R1, a resistor R2, a resistor R3, a transistor Q1, a transistor Q2, an optical coupler OC1 and a diode D1, characterized in that: One end of the resistor R1 is connected to the emitter of the transistor Q1, the C pin of the optocoupler OC1 and the power supply VCC, the other end of the resistor R1 is connected to the resistor R3 and the base of the transistor Q1, the other end of the resistor R3 is connected to the cathode of the diode D1 and the collector of the transistor Q2, the base of the transistor Q2 is connected to the resistor R4, the resistor R5 and the resistor R7, the other end of the resistor R4 is connected to the collector of the transistor Q1, the other end of the resistor R7 is connected to the resistor R6 and the emitter of the transistor Q2, the other end of the resistor R5 is connected to the other end of the resistor R6 and the E pin of the optocoupler OC1, the A pin of the optocoupler OC1 is connected to the resistor R2, the K pin of the optocoupler OC1 is grounded, the anode of the diode D1 is connected to the COM signal, and the other end of the resistor R2 is connected to the protection signal OPT.
2. The isolation interlock protection control circuit according to claim 1, characterized in that: The transistor Q1 is a PNP transistor.
3. The isolation interlock protection control circuit according to claim 1, characterized in that: The transistor Q1 is an NPN transistor.
4. The isolation interlock protection control circuit according to claim 1, characterized in that: The diode D1 is a voltage stabilizing diode.