Continuous indication circuit based on charging and discharging loop

Abstract

The invention discloses a continuous indicating circuit based on a charging and discharging loop, and relates to the technical field of silicon controlled rectifier speed regulation. The circuit comprises a switch, a bidirectional silicon controlled rectifier, a bidirectional trigger diode, a capacitor and an indication branch, the indication branch comprises a first resistor, a first light-emitting diode and a second light-emitting diode, the positive electrode of the first light-emitting diode is connected with the negative electrode of the second light-emitting diode, and the negative electrode of the first light-emitting diode is connected with the positive electrode of the second light-emitting diode. The two light-emitting diodes connected in parallel form a light-emitting diode group, the first resistor and the light-emitting diode group are connected to form an indication branch, and the indication branch is connected between the capacitor and the gating contact of the switch; a common contact of the switch is connected with the capacitor through the bidirectional thyristor and the bidirectional trigger diode; the first light-emitting diode and the second light-emitting diode which are reversely connected in parallel form an indication branch circuit, so that the working state can be synchronously and continuously indicated based on the charging and discharging loop of the capacitor, and the cost performance is better while the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of silicon controlled rectifier speed regulation, and in particular to a continuation indication circuit based on a charge and discharge loop. Background Art

[0002] At present, the thyristor speed control circuit has the characteristics of simple structure and low cost, and is applied to single-phase motors, such as water pump speed control. Its use occasions are subject to many restrictions; for example, the market has the demand for gear adjustment and gear display, providing customers with more gear speed control options. However, due to the thyristor debugging system, the water pump needs to add gear speed control and display functions, and it is necessary to add MCU to the traditional circuit, and add a series of supporting circuits such as working power supply and rectifier circuit; if so many components are used only for display purposes, the product will lack cost performance.

[0003] Therefore, how to design and develop a low-cost speed regulation and display circuit that takes into account multiple working conditions is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The invention provides a continuation indication circuit based on a charge and discharge loop, which solves the technical problem that the indication circuit has a low cost performance.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A continuation indication circuit based on a charge and discharge loop comprises a switch, a bidirectional thyristor BTA20, a bidirectional trigger diode DB3, a capacitor C1 and an indication branch, wherein the indication branch comprises a first resistor R1, a first light-emitting diode D1 and a second light-emitting diode D2, wherein the positive electrode of the first light-emitting diode D1 is electrically connected to the negative electrode of the second light-emitting diode D2, the negative electrode of the first light-emitting diode D1 is electrically connected to the positive electrode of the second light-emitting diode D2, the first light-emitting diode D1 and the second light-emitting diode D2 are connected in parallel to form a light-emitting diode group, the first resistor R1 is electrically connected to the light-emitting diode group to form an indication branch, one end of the indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to a neutral line N of an alternating current via a motor B1, and the other end of the indication branch is connected to a selection contact of a switch; the common contact of the switch is electrically connected to the junction of the indication branch and the capacitor C1 via the bidirectional thyristor BTA20 and the bidirectional trigger diode DB3 in sequence, and the common contact of the switch is used to connect to a live line L of the alternating current.

[0007] A further technical solution is that: the indication branch includes first to third indication branches with the same structure, the switch is a selection switch J1, the first indication branch includes a first resistor R1, a first light-emitting diode D1 and a second light-emitting diode D2, the first light-emitting diode D1 and the second light-emitting diode D2 connected in parallel form a first light-emitting diode group, the first resistor R1 is electrically connected to the first light-emitting diode group to form a first indication branch, one end of the first indication branch is electrically connected to one end of the capacitor C1, and the other end of the first indication branch is connected to a selection contact of the selection switch J1.

[0008] A further technical solution is that the second indication branch includes a second resistor R2, a third light-emitting diode D3 and a fourth light-emitting diode D4, the anode of the third light-emitting diode D3 is electrically connected to the cathode of the fourth light-emitting diode D4, the cathode of the third light-emitting diode D3 is electrically connected to the anode of the fourth light-emitting diode D4, the third light-emitting diode D3 and the fourth light-emitting diode D4 connected in parallel form a second light-emitting diode group, the second resistor R2 is electrically connected to the second light-emitting diode group to form a second indication branch, one end of the second indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the second indication branch is connected to a selection contact of the selection switch J1.

[0009] A further technical solution is that the third indication branch includes a third resistor R3, a fifth light-emitting diode D5 and a sixth light-emitting diode D6, the anode of the fifth light-emitting diode D5 is electrically connected to the cathode of the sixth light-emitting diode D6, the cathode of the fifth light-emitting diode D5 is electrically connected to the anode of the sixth light-emitting diode D6, the fifth light-emitting diode D5 and the sixth light-emitting diode D6 connected in parallel form a third light-emitting diode group, the third resistor R3 is electrically connected to the third light-emitting diode group to form a third indication branch, one end of the third indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the third indication branch is connected to a selection contact of the selection switch J1.

[0010] The beneficial effects of adopting the above technical solution are:

[0011] A continuation indication circuit based on a charge and discharge loop comprises a switch, a bidirectional thyristor BTA20, a bidirectional trigger diode DB3, a capacitor C1 and an indication branch, wherein the indication branch comprises a first resistor R1, a first light-emitting diode D1 and a second light-emitting diode D2, wherein the positive electrode of the first light-emitting diode D1 is electrically connected to the negative electrode of the second light-emitting diode D2, the negative electrode of the first light-emitting diode D1 is electrically connected to the positive electrode of the second light-emitting diode D2, the first light-emitting diode D1 and the second light-emitting diode D2 are connected in parallel to form a light-emitting diode group, the first resistor R1 is electrically connected to the light-emitting diode group to form an indication branch, one end of the indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to a neutral line N of an alternating current via a motor B1, and the other end of the indication branch is connected to a selection contact of a switch; the common contact of the switch is electrically connected to the junction of the indication branch and the capacitor C1 via the bidirectional thyristor BTA20 and the bidirectional trigger diode DB3 in sequence, and the common contact of the switch is used to connect to a live line L of the alternating current. It forms an indication branch by connecting the first light emitting diode D1 and the second light emitting diode D2 in reverse parallel, and can synchronously continue to indicate the working state based on the charging and discharging circuit of the capacitor, thereby reducing the cost and having a better cost performance.

[0012] Please refer to the detailed description of the specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the waveform diagram of single-phase alternating current;

[0014] Figure 2 It is a distribution diagram of the current flow direction during the positive half cycle of the single-phase alternating current in the present invention;

[0015] Figure 3 It is a distribution diagram of the current flow direction during the negative half cycle of single-phase alternating current in the present invention;

[0016] Figure 4 It is a waveform diagram of the control opening in the present invention;

[0017] Figure 5 It is a data relationship diagram between the LED display and the charging and discharging circuit in the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0020] Embodiment 1:

[0021] like Figure 2 As shown, the present invention discloses a continuation indication circuit based on a charge and discharge loop, including a selection switch J1, a bidirectional thyristor BTA20, a bidirectional trigger diode DB3, a capacitor C1, first to third resistors R1-R3 and first to sixth light-emitting diodes D1-D6, the first to third resistors R1-R3 and the first to sixth light-emitting diodes D1-D6 form first to third indication branches with the same structure, that is, the number of indication branches is three, and the indication branches include the first to third indication branches with the same structure.

[0022] The first indication branch includes a first resistor R1, a first light-emitting diode D1 and a second light-emitting diode D2, the positive electrode of the first light-emitting diode D1 is electrically connected to the negative electrode of the second light-emitting diode D2, the negative electrode of the first light-emitting diode D1 is electrically connected to the positive electrode of the second light-emitting diode D2, the first light-emitting diode D1 and the second light-emitting diode D2 are connected in parallel to form a first light-emitting diode group, the first resistor R1 is electrically connected to the first light-emitting diode group to form a first indication branch, one end of the first indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the first indication branch is connected to the third selection contact 3 of the selection switch J1.

[0023] The second indication branch includes a second resistor R2, a third light-emitting diode D3 and a fourth light-emitting diode D4, the anode of the third light-emitting diode D3 is electrically connected to the cathode of the fourth light-emitting diode D4, the cathode of the third light-emitting diode D3 is electrically connected to the anode of the fourth light-emitting diode D4, the third light-emitting diode D3 and the fourth light-emitting diode D4 connected in parallel form a second light-emitting diode group, the second resistor R2 is electrically connected to the second light-emitting diode group to form a second indication branch, one end of the second indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the second indication branch is connected to the second selection contact 2 of the selection switch J1.

[0024] The third indication branch includes a third resistor R3, a fifth light-emitting diode D5 and a sixth light-emitting diode D6, the anode of the fifth light-emitting diode D5 is electrically connected to the cathode of the sixth light-emitting diode D6, the cathode of the fifth light-emitting diode D5 is electrically connected to the anode of the sixth light-emitting diode D6, the fifth light-emitting diode D5 and the sixth light-emitting diode D6 connected in parallel form a third light-emitting diode group, the third resistor R3 is electrically connected to the third light-emitting diode group to form a third indication branch, one end of the third indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the third indication branch is connected to the first selection contact 1 of the selection switch J1.

[0025] The common contact 0 of the selection switch J1 is electrically connected to the junction of the indicating branch and the capacitor C1 via the bidirectional thyristor BTA20 and the bidirectional trigger diode DB3 in sequence. The common contact 0 of the selection switch J1 is used to connect the live wire L of the alternating current.

[0026] Analysis process:

[0027] like Figure 1 As shown, taking 220V as reference and single-phase AC input, you can see the voltage waveform.

[0028] like Figure 2 As shown, this application uses a bidirectional thyristor as the main switching device to design a single-phase AC speed control controller. The analysis in the positive half cycle is as follows:

[0029] S1 loop description: In the positive half cycle of AC input 0~T2, the current flows from the mark point L to the mark point L1, and the loop it passes through is S1. In the current passing loop, it also passes through the third light-emitting diode D3, making the current of the light-emitting tube light up. This is part of the gear indication circuit.

[0030] S2 loop description: When the capacitor C1 in the loop exceeds the trigger voltage of the bidirectional trigger diode DB3 and continues to reach the turn-on voltage of the bidirectional thyristor BTA20, the current passes through the capacitor C1 and the bidirectional trigger diode DB3 to discharge to GT1, which is loop S2 in the figure. At this time, G is positive relative to T1, T2 is positive relative to T1, and the bidirectional thyristor BTA20 works in the first quadrant.

[0031] S3 loop description: After the bidirectional thyristor BTA20 is turned on, S3 is the current flow of the load main circuit. It is mainly responsible for establishing the circuit path for dragging the load.

[0032] S4 loop description: During the load path establishment period, capacitor C1 will release the charge through S4 path, and the release circuit includes the fourth light-emitting diode D4. This is another part of the gear indication circuit. From this point on, the indication is completed and the motor drive is also completed synchronously.

[0033] like Figure 3 As shown, this application uses a bidirectional thyristor as the main switching device to design a single-phase AC speed control controller. The analysis in the negative half cycle is as follows:

[0034] S5 loop description: During the negative half cycle of the AC input T2-T4, the current flows from the mark point L1 to the mark point L, and the loop it passes through is S5. In the current passing loop, it also passes through the fourth light-emitting diode D4, making the current of the light-emitting tube light up. This is part of the gear position indication circuit.

[0035] S6 loop description: When the reverse charge of capacitor C1 in the loop exceeds the trigger voltage of bidirectional trigger diode DB3 and continues to reach the turn-on voltage of bidirectional thyristor BTA20, the current passes through capacitor C1 and discharges to GT1 via bidirectional trigger diode DB3, which is loop S6 in the figure. At this time, G is negative relative to T1, T2 is negative relative to T1, and bidirectional thyristor BTA20 works in the third quadrant.

[0036] S7 loop description: After the bidirectional thyristor BTA20 is turned on, S7 is the current flow of the load main circuit. It is mainly responsible for establishing the circuit path for driving the load.

[0037] S8 loop description: During the load path establishment period, capacitor C1 will release the charge through S8 path, and the release circuit includes the third light-emitting diode D3. This is another part of the gear indication circuit. From this point on, the indication is completed and the motor drive is also completed synchronously.

[0038] Actual measured waveform:

[0039] like Figure 4 As shown in the figure, the control opening waveform. The continuous and complete waveform curve is the AC input voltage waveform, the AC current after control, and the voltage waveform on capacitor C1. The figure illustrates the opening process of the tube.

[0040] like Figure 5 As shown, the relationship between LED display and charging and discharging circuit, the alternating voltage waveform at both ends of the light-emitting diode, the controlled AC current, and the voltage waveform of capacitor C1 illustrate the relationship between LED display and driving.

[0041] In order to solve the problem of how to design and develop a low-cost speed regulation and display circuit that takes into account multiple working conditions, this application uses the continuation indication circuit of the charging and discharging circuit and cleverly utilizes the charging and releasing circuit of capacitor C1 to make the two LED lights flash alternately, forming a visual residue at a certain frequency, thereby realizing the functional requirements of thyristor speed regulation and gear display.

[0042] Highlights of this application:

[0043] 1. Low cost

[0044] Compared with the thyristor speed control circuit, only two LED lights are added, and the resistance value of the current limiting resistor is adjusted while taking the charging resistance value into consideration, so that the gear position display can be completed.

[0045] 2. LED visual retention

[0046] LED cleverly uses the charging and discharging process of capacitor C1 to supply power alternately, so that the LEDs can light up alternately, and then use visual delay to add a light guide column to the outer casing, so that the two lights have the same display effect as one light.

[0047] 3. Protect each other

[0048] The two light emitting diodes are connected in parallel in opposite directions, and the lighting of one light emitting diode can synchronously protect the other light emitting diode from high voltage reverse excitation.

[0049] Embodiment 2:

[0050] Embodiment 2 is different from Embodiment 1 in that the indication branch includes a first indication branch and a second indication branch having the same structure.

[0051] The present invention discloses a continuation indication circuit based on a charge and discharge loop, including a selection switch J1, a bidirectional thyristor BTA20, a bidirectional trigger diode DB3, a capacitor C1, a first resistor R1, a second resistor R2, and first to fourth light-emitting diodes D1-D4. The indication branch includes a first indication branch and a second indication branch with the same structure, and the similarities are not repeated here.

[0052] Compared with the above embodiment, the number of indication branches can be flexibly set according to usage requirements.

Claims

1. A continuation indication circuit based on a charge and discharge circuit, characterized in that: It includes a switch, a bidirectional thyristor BTA20, a bidirectional trigger diode DB3, a capacitor C1 and an indication branch. The indication branch includes a first resistor R1, a first light-emitting diode D1 and a second light-emitting diode D2. The positive electrode of the first light-emitting diode D1 is electrically connected to the negative electrode of the second light-emitting diode D2, the negative electrode of the first light-emitting diode D1 is electrically connected to the positive electrode of the second light-emitting diode D2, the first light-emitting diode D1 and the second light-emitting diode D2 are connected in parallel to form a light-emitting diode group, the first resistor R1 is electrically connected to the light-emitting diode group to form an indication branch, one end of the indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the indication branch is connected to the selection contact of the switch; the common contact of the switch is electrically connected to the junction of the indication branch and the capacitor C1 through the bidirectional thyristor BTA20 and the bidirectional trigger diode DB3 in turn, and the common contact of the switch is used to connect to the live line L of the alternating current.

2. A continuation indication circuit based on a charge and discharge circuit according to claim 1, characterized in that: The indication branch includes first to third indication branches with the same structure, the switch is a selection switch J1, the first indication branch includes a first resistor R1, a first light-emitting diode D1 and a second light-emitting diode D2, the first light-emitting diode D1 and the second light-emitting diode D2 connected in parallel form a first light-emitting diode group, the first resistor R1 is electrically connected to the first light-emitting diode group to form a first indication branch, one end of the first indication branch is electrically connected to one end of the capacitor C1, and the other end of the first indication branch is connected to a selection contact of the selection switch J1.

3. A continuation indication circuit based on a charge and discharge circuit according to claim 2, characterized in that: The second indication branch includes a second resistor R2, a third light-emitting diode D3 and a fourth light-emitting diode D4, the anode of the third light-emitting diode D3 is electrically connected to the cathode of the fourth light-emitting diode D4, the cathode of the third light-emitting diode D3 is electrically connected to the anode of the fourth light-emitting diode D4, the third light-emitting diode D3 and the fourth light-emitting diode D4 connected in parallel form a second light-emitting diode group, the second resistor R2 is electrically connected to the second light-emitting diode group to form a second indication branch, one end of the second indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the second indication branch is connected to a selection contact of the selection switch J1.

4. A continuation indication circuit based on a charge and discharge circuit according to claim 2, characterized in that: The third indication branch includes a third resistor R3, a fifth light-emitting diode D5 and a sixth light-emitting diode D6, the anode of the fifth light-emitting diode D5 is electrically connected to the cathode of the sixth light-emitting diode D6, the cathode of the fifth light-emitting diode D5 is electrically connected to the anode of the sixth light-emitting diode D6, the fifth light-emitting diode D5 and the sixth light-emitting diode D6 connected in parallel form a third light-emitting diode group, the third resistor R3 is electrically connected to the third light-emitting diode group to form a third indication branch, one end of the third indication branch is electrically connected to one end of the capacitor C1, the other end of the capacitor C1 is used to connect to the neutral line N of the alternating current through the motor B1, and the other end of the third indication branch is connected to a selection contact of the selection switch J1.

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