Intelligent control circuit of power switch

Abstract

The utility model discloses an intelligent control circuit for a power switch, which relates to the technical field of power switches and comprises a power supply module for supplying power; the power supply control module is used for transmitting electric energy; the intelligent control module is used for controlling the voltage control module to carry out voltage regulation and power-off work and supplying power to load equipment connected with the load module; the fault judgment module is used for carrying out isolated power supply detection on the voltage control module when the voltage control module is powered off and outputting a high-level signal when the voltage control module outputs electric energy; and the signal processing module is used for carrying out self-locking processing on the signal output by the fault judgment module and controlling the power-off work of the power supply control module. According to the intelligent control circuit of the power switch, common electric energy transmission control of the knife switch and the field effect transistor is realized, when the voltage control module cannot be normally powered off, the power supply control module performs power-off protection, the safety of the circuit is improved, the working period of the knife switch is shortened, and the circuit is simple and easy to implement and low in energy consumption.

Description

Technical Field

[0001] The utility model relates to the technical field of power switches, in particular to an intelligent control circuit for a power switch. Background Art

[0002] Switches are the most common electrical equipment in daily life. Traditional switches are mostly switched on and off by push-button switches or knife switches. Traditional switches are prone to wear or damage due to long-term closing and opening, and sparks are prone to occur during frequent closing and power-off. Therefore, most existing power switches use power switching devices composed of field effect tubes or thyristors to transmit electric energy. However, power switching devices composed of field effect tubes or thyristors may short-circuit, resulting in failure to perform power-off work normally, which poses certain safety hazards and needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides an intelligent control circuit for a power switch to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An intelligent control circuit for a power switch, comprising: a power supply module, a power supply control module, an intelligent control module, a voltage control module, a load module, a fault judgment module and a signal processing module;

[0006] A power module, used to access DC power;

[0007] A power supply control module, connected to the power supply module, the voltage control module and the signal processing module, for receiving the DC power connected to the power supply module, for dividing the DC power and transmitting the received DC power to the voltage control module, and for receiving the second protection signal output by the signal processing module and stopping the transmission of power;

[0008] An intelligent control module, connected to the voltage control module and the fault judgment module, used to output a first pulse signal and control the voltage regulation work of the voltage control module, used to output a first protection signal and stop the power transmission work of the voltage control module and control the isolated power supply detection work of the fault judgment module;

[0009] A voltage control module, used for receiving the first pulse signal and performing voltage regulation processing on the electric energy output by the power supply control module, and for receiving the first protection signal and stopping the transmission of electric energy;

[0010] A load module, connected to the voltage control module, used to receive the electric energy output by the voltage control module, and used to connect to a load device;

[0011] a fault judgment module, connected to the voltage control module, for receiving a first protection signal and performing isolated power supply detection on the electric energy output by the voltage control module, and outputting a first fault signal when the voltage control module outputs electric energy;

[0012] The signal processing module is connected to the fault judgment module and is used to perform self-locking processing on the first fault signal and output a second protection signal for controlling the power-off operation of the power supply control module.

[0013] As a further solution of the utility model: the power supply module includes a power supply interface and a first capacitor; the power supply control module includes a first resistor, a second resistor, a first switch tube, a second switch tube, a first relay, a third resistor and a first relay switch;

[0014] Preferably, the first end of the power interface is connected to one end of the first capacitor, one end of the first resistor, one end of the third resistor and the moving end of the first relay switch, the other end of the first resistor is connected to the base of the second switch tube, the collector of the first switch tube and one end of the second resistor, the collector of the second switch tube is connected to one end of the first relay, the other end of the first relay is connected to the other end of the third resistor, the emitter of the second switch tube, the emitter of the first switch tube, the other end of the second resistor, the other end of the first capacitor and the second end of the power interface are all grounded, the base of the first switch tube is connected to the signal processing module, and the fixed end of the first relay switch is connected to the voltage control module.

[0015] As a further solution of the utility model: the voltage control module includes a first power tube, a fourth resistor, a third switch tube and a first diode; the intelligent control module includes a first integrated controller;

[0016] Preferably, the drain of the first power tube is connected to the fixed end of the first relay switch and is connected to the gate of the first power tube and the collector of the third switch tube through a fourth resistor, the emitter of the third switch tube is grounded, the base of the third switch tube is connected to the cathode of the first diode and the first end of the first integrated controller, the second end of the first integrated controller is connected to the anode of the first diode and the fault judgment module, and the source of the first power tube is connected to the load module.

[0017] As a further solution of the utility model: the load module includes a second diode, a second capacitor and a load interface;

[0018] Preferably, the anode of the second diode is connected to the source of the first power tube, the cathode of the second diode is connected to the first end of the load port and is connected to the second end of the load interface and the ground through the second capacitor.

[0019] As a further solution of the utility model: the fault judgment module includes a sixth resistor, a fourth switch tube, a first optical coupler, a seventh resistor and a second power supply;

[0020] Preferably, the first end of the first optocoupler is connected to the source of the first power tube through the sixth resistor, the second end of the first optocoupler is connected to the collector of the fourth switching tube, the emitter of the fourth switching tube is grounded, the base of the fourth switching tube is connected to the second end of the first integrated controller, the third end of the first optocoupler is connected to the second power supply, and the fourth end of the first optocoupler is connected to the signal processing module and grounded through the seventh resistor.

[0021] As a further solution of the utility model: the signal processing module includes a fourth diode, a third diode, a first logic chip, a fifth resistor and a first power supply;

[0022] Preferably, the anode of the fourth diode is connected to the fourth end of the first optocoupler, the cathode of the fourth diode is connected to the cathode of the third diode and the IN1 end of the first logic chip, the IN2 end of the first logic chip is connected to the first power supply through the fifth resistor, and the OUT end of the first logic chip is connected to the base of the first switching tube.

[0023] Compared with the prior art, the beneficial effects of the utility model are as follows: the intelligent control circuit of the power switch of the utility model is that the power supply control module performs power transmission when the power supply module is connected to DC power, and the intelligent control module controls the voltage control module to adjust the voltage, and when a circuit fault occurs, the voltage control module is controlled to perform power-off protection, and the fault judgment module is triggered to detect the power-off state of the voltage control module. If the voltage control module does not perform power-off protection, the signal processing module will control the power supply control module to perform power-off protection, thereby realizing the common power transmission control of the knife switch and the field effect transistor, improving the safety of the circuit, reducing the working cycle of the knife switch, and the control circuit is simple and easy, with low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The present invention provides a schematic block diagram of a power switch intelligent control circuit.

[0026] Figure 2 A circuit diagram of an intelligent control circuit for a power switch provided in an example of the utility model.

[0027] Figure 3 This is a connection circuit diagram of a fault judgment module provided by an example of the utility model. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0029] In one embodiment, see Figure 1 , an intelligent control circuit for a power switch, comprising: a power supply module 1, a power supply control module 2, an intelligent control module 3, a voltage control module 4, a load module 5, a fault judgment module 6 and a signal processing module 7;

[0030] Specifically, the power module 1 is used to access DC power;

[0031] The power supply control module 2 is connected to the power supply module 1, the voltage control module 4 and the signal processing module 7, and is used to receive the DC power connected to the power supply module 1, to divide the DC power and transmit the received DC power to the voltage control module 4, and to receive the second protection signal output by the signal processing module 7 and stop the transmission of power;

[0032] The intelligent control module 3 is connected to the voltage control module 4 and the fault judgment module 6, and is used to output a first pulse signal and control the voltage regulation work of the voltage control module 4, and is used to output a first protection signal and stop the power transmission work of the voltage control module 4 and control the isolation power supply detection work of the fault judgment module 6;

[0033] The voltage control module 4 is used to receive the first pulse signal and perform voltage regulation on the electric energy output by the power supply control module 2, and is used to receive the first protection signal and stop the transmission of electric energy;

[0034] A load module 5, connected to the voltage control module 4, used to receive the electric energy output by the voltage control module 4, and used to connect to a load device;

[0035] A fault judgment module 6 is connected to the voltage control module 4, and is used to receive the first protection signal and perform isolated power supply detection on the electric energy output by the voltage control module 4, and output a first fault signal when the voltage control module 4 outputs electric energy;

[0036] The signal processing module 7 is connected to the fault judgment module 6 and is used to perform self-locking processing on the first fault signal and output a second protection signal for controlling the power-off operation of the power supply control module 2 .

[0037] In a specific embodiment, the power supply module 1 may adopt a power supply circuit composed of a power supply interface and a capacitor, which may be connected to a DC power supply and connected to DC power; the power supply control module 2 may adopt a power supply control circuit composed of a resistor, a transistor, a relay, etc., which may automatically perform power transmission when the power supply module 1 is connected to DC power; the intelligent control module 3 may adopt an intelligent control circuit composed of an integrated controller, which may provide a first pulse signal to adjust the power output by the voltage control module 4, and may also provide a first protection signal to control the power-off work of the voltage control module 4 when a circuit fails, which will not be described in detail; the voltage The control module 4 can adopt a voltage control circuit composed of power tubes, triodes, etc. to realize voltage regulation and power-off control; the above-mentioned load module 5 can adopt a load circuit composed of diodes, load interfaces and capacitors to rectify and filter the input electric energy and connect it to the load equipment; the above-mentioned fault judgment module 6 can adopt a fault judgment circuit composed of photoelectric couplers, resistors, triodes, etc., and can isolate the power supply detection of the electric energy output by the voltage regulation module when the intelligent control module 3 provides the first protection signal; the above-mentioned signal processing module 7 can adopt a signal processing module 7 composed of logic chips, diodes, etc. to perform self-locking processing on the input high-level signal.

[0038] In another embodiment, see Figure 1 , Figure 2 and Figure 3 The power supply module 1 includes a power supply interface and a first capacitor C1; the power supply control module 2 includes a first resistor R1, a second resistor R2, a first switch tube VT1, a second switch tube VT2, a first relay K1, a third resistor R3 and a first relay switch K1-1;

[0039] Specifically, a first end of the power interface is connected to one end of the first capacitor C1, one end of the first resistor R1, one end of the third resistor R3 and the moving end of the first relay switch K1-1, the other end of the first resistor R1 is connected to the base of the second switch tube VT2, the collector of the first switch tube VT1 and one end of the second resistor R2, the collector of the second switch tube VT2 is connected to one end of the first relay K1, the other end of the first relay K1 is connected to the other end of the third resistor R3, the emitter of the second switch tube VT2, the emitter of the first switch tube VT1, the other end of the second resistor R2, the other end of the first capacitor C1 and the second end of the power interface are all grounded, the base of the first switch tube VT1 is connected to the signal processing module 7, and the fixed end of the first relay switch K1-1 is connected to the voltage control module 4.

[0040] In a specific embodiment, the first resistor R1 and the second resistor R2 perform voltage division processing on the DC power connected to the power interface so as to trigger the conduction state of the second switch tube VT2; the first switch tube VT1 and the second switch tube VT2 can both be NPN transistors, wherein the second switch tube VT2 controls the operation of the first relay K1, and the first switch tube VT1 controls the conduction state of the second switch tube VT2; the first relay switch K1-1 can be a normally open switch, which is controlled to close by the first relay K1 through magnetic attraction.

[0041] Further, the voltage control module 4 includes a first power tube Q1, a fourth resistor R4, a third switch tube VT3 and a first diode D1; the intelligent control module 3 includes a first integrated controller;

[0042] Specifically, the drain of the first power tube Q1 is connected to the fixed end of the first relay switch K1-1 and is connected to the gate of the first power tube Q1 and the collector of the third switch tube VT3 through the fourth resistor R4. The emitter of the third switch tube VT3 is grounded. The base of the third switch tube VT3 is connected to the cathode of the first diode D1 and the first end of the first integrated controller. The second end of the first integrated controller is connected to the anode of the first diode D1 and the fault judgment module 6. The source of the first power tube Q1 is connected to the load module 5.

[0043] In a specific embodiment, the above-mentioned first power tube Q1 can be an N-channel field effect tube; the above-mentioned third switch tube VT3 can be an NPN-type transistor; the above-mentioned first integrated controller can adopt a single-chip microcomputer, and the specific model is not limited, wherein the first end of the first integrated controller outputs a first pulse signal to control the conduction degree of the third switch tube VT3 and control the first power tube Q1 to perform voltage regulation, and the second end of the first integrated controller outputs a first protection signal to directly control the cutoff of the first power tube Q1 by controlling the conduction of the third switch tube VT3.

[0044] Further, the load module 5 includes a second diode D2, a second capacitor C2 and a load interface;

[0045] Specifically, the anode of the second diode D2 is connected to the source of the first power transistor Q1 , the cathode of the second diode D2 is connected to the first end of the load port and is connected to the second end of the load interface and the ground through the second capacitor C2 .

[0046] In a specific embodiment, the load interface is connected to a load device, and the second diode D2 and the second capacitor C2 perform rectification and filtering.

[0047] Furthermore, the fault judgment module 6 includes a sixth resistor R6, a fourth switch tube VT4, a first optical coupler U2, a seventh resistor R7 and a second power supply VCC2;

[0048] Specifically, the first end of the first optocoupler U2 is connected to the source of the first power tube Q1 through the sixth resistor R6, the second end of the first optocoupler U2 is connected to the collector of the fourth switch tube VT4, the emitter of the fourth switch tube VT4 is grounded, the base of the fourth switch tube VT4 is connected to the second end of the first integrated controller, the third end of the first optocoupler U2 is connected to the second power supply VCC2, and the fourth end of the first optocoupler U2 is connected to the signal processing module 7 and grounded through the seventh resistor R7.

[0049] In a specific embodiment, the first optical coupler U2 may be a PC817 photoelectric coupler; and the fourth switch tube VT4 may be an NPN transistor.

[0050] Further, the signal processing module 7 includes a fourth diode VT4, a third diode D3, a first logic chip U1, a fifth resistor R5 and a first power supply VCC1;

[0051] Specifically, the anode of the fourth diode VT4 is connected to the fourth end of the first optocoupler U2, the cathode of the fourth diode VT4 is connected to the cathode of the third diode D3 and the IN1 end of the first logic chip U1, the IN2 end of the first logic chip U1 is connected to the first power supply VCC1 through the fifth resistor R5, and the OUT end of the first logic chip U1 is connected to the base of the first switch tube VT1.

[0052] In a specific embodiment, the first logic chip U1 can be an AND gate logic chip, which cooperates with the fourth diode VT4, the third diode D3, the fifth resistor R5 and the first power supply VCC1 to perform high-level signal self-locking. Disconnecting the first power supply VCC1 will stop the self-locking work.

[0053] In an intelligent control circuit of a power switch of the present embodiment, direct current power is connected to a power interface, a first resistor R1 and a second resistor R2 divide the voltage and trigger the second switch tube VT2 to turn on, the first relay K1 is energized and controls the first relay switch K1-1 to close, thereby transmitting power, and triggering the first power tube Q1 to turn on through the fourth resistor R4, the first power tube Q1 performs power transmission, and transmits the power to a load device connected to the load interface through the second diode D2, and at the same time, a first pulse signal outputted from the first end of the first integrated controller can adjust the conduction degree of the third switch tube VT3, and then adjust the conduction degree of the first power tube Q1 to perform voltage regulation, and if a circuit fails, the second end of the first integrated controller will output a first protection signal, and the first protection signal will directly control the conduction of the third switch tube VT3. The first integrated controller controls the fourth switch tube VT4 to turn on, and the first optocoupler U2 detects the voltage at the source of the first power tube Q1. If there is voltage at this time, the first optocoupler U2 will turn on, indicating that the first power tube Q1 fails. At this time, the first logic chip U1 cooperates with the fourth diode VT4, the third diode D3, the fifth resistor R5 and the first power supply VCC1 to perform signal self-locking. When the power supply of the first power supply VCC1 is disconnected, the first logic chip U1 will stop the signal self-locking work, and the high-level signal output from the OUT end of the first logic chip U1 will control the first switch tube VT1 to turn on, the second switch tube VT2 to turn off, the first relay K1 loses power, and the first relay switch K1-1 is disconnected again to further perform power-off protection.

[0054] 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 essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, 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 be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An intelligent control circuit for a power switch, characterized in that: The power switch intelligent control circuit includes: a power supply module, a power supply control module, an intelligent control module, a voltage control module, a load module, a fault judgment module and a signal processing module; The power module is used to access direct current power; The power supply control module is connected to the power supply module, the voltage control module and the signal processing module, and is used to receive the DC power connected to the power supply module, to divide the DC power and transmit the received DC power to the voltage control module, and to receive the second protection signal output by the signal processing module and stop the transmission of power; The intelligent control module is connected to the voltage control module and the fault judgment module, and is used to output a first pulse signal and control the voltage regulation work of the voltage control module, and is used to output a first protection signal and stop the power transmission work of the voltage control module and control the isolation power supply detection work of the fault judgment module; The voltage control module is used to receive the first pulse signal and perform voltage regulation on the electric energy output by the power supply control module, and is used to receive the first protection signal and stop the transmission of electric energy; The load module is connected to the voltage control module, used to receive the electric energy output by the voltage control module, and used to connect to the load device; The fault judgment module is connected to the voltage control module, and is used to receive the first protection signal and perform isolated power supply detection on the electric energy output by the voltage control module, and output a first fault signal when the voltage control module outputs electric energy; The signal processing module is connected to the fault judgment module, and is used to perform self-locking processing on the first fault signal and output a second protection signal, which is used to control the power-off operation of the power supply control module.

2. The intelligent control circuit for a power switch according to claim 1, characterized in that: The power supply module includes a power supply interface and a first capacitor; the power supply control module includes a first resistor, a second resistor, a first switch tube, a second switch tube, a first relay, a third resistor and a first relay switch; The first end of the power interface is connected to one end of the first capacitor, one end of the first resistor, one end of the third resistor and the moving end of the first relay switch, the other end of the first resistor is connected to the base of the second switch tube, the collector of the first switch tube and one end of the second resistor, the collector of the second switch tube is connected to one end of the first relay, the other end of the first relay is connected to the other end of the third resistor, the emitter of the second switch tube, the emitter of the first switch tube, the other end of the second resistor, the other end of the first capacitor and the second end of the power interface are all grounded, the base of the first switch tube is connected to the signal processing module, and the fixed end of the first relay switch is connected to the voltage control module.

3. The intelligent control circuit of a power switch according to claim 2, characterized in that: The voltage control module includes a first power tube, a fourth resistor, a third switch tube and a first diode; the intelligent control module includes a first integrated controller; The drain of the first power tube is connected to the fixed end of the first relay switch and is connected to the gate of the first power tube and the collector of the third switch tube through the fourth resistor. The emitter of the third switch tube is grounded. The base of the third switch tube is connected to the cathode of the first diode and the first end of the first integrated controller. The second end of the first integrated controller is connected to the anode of the first diode and the fault judgment module. The source of the first power tube is connected to the load module.

4. The intelligent control circuit for a power switch according to claim 3, characterized in that: The load module includes a second diode, a second capacitor and a load interface; The anode of the second diode is connected to the source of the first power tube, the cathode of the second diode is connected to the first end of the load port and is connected to the second end of the load interface and the ground through the second capacitor.

5. The intelligent control circuit for a power switch according to claim 4, characterized in that: The fault judgment module includes a sixth resistor, a fourth switch tube, a first optical coupler, a seventh resistor and a second power supply; The first end of the first optocoupler is connected to the source of the first power tube through the sixth resistor, the second end of the first optocoupler is connected to the collector of the fourth switch tube, the emitter of the fourth switch tube is grounded, the base of the fourth switch tube is connected to the second end of the first integrated controller, the third end of the first optocoupler is connected to the second power supply, and the fourth end of the first optocoupler is connected to the signal processing module and grounded through the seventh resistor.

6. The intelligent control circuit for a power switch according to claim 5, characterized in that: The signal processing module includes a fourth diode, a third diode, a first logic chip, a fifth resistor and a first power supply; The anode of the fourth diode is connected to the fourth end of the first optocoupler, the cathode of the fourth diode is connected to the cathode of the third diode and the IN1 end of the first logic chip, the IN2 end of the first logic chip is connected to the first power supply through the fifth resistor, and the OUT end of the first logic chip is connected to the base of the first switch tube.

Images