WO2020052297A1

WO2020052297A1 - Light regulation and speed regulation circuit

Info

Publication number: WO2020052297A1
Application number: PCT/CN2019/090740
Authority: WO
Inventors: 张文龙; 陈元木
Original assignee: 厦门天力源光电科技有限公司
Priority date: 2018-09-14
Filing date: 2019-06-11
Publication date: 2020-03-19
Also published as: CN109246904A

Abstract

Disclosed by the present invention is a light regulation and speed regulation circuit, comprising a main trigger circuit connected in series between a live end and a neutral end; the main trigger circuit comprises an adjustable resistance network; further comprised is a compensation circuit connected in parallel with the adjustable resistance network, the compensation circuit comprising a switch execution element, and the compensation circuit providing current compensation to the adjustable resistance network within a period of time after the power supply switch is closed so as to meet the start-up current of a load and cause the switch execution element in the compensation circuit to be continuously switched on during said period of time; therefore, the brightness of the load or the speed of the load may be adjusted by means of the adjustable resistance network and the switch execution element in the compensation circuit. The present invention causes a lamp to work in a state of or close to the minimum brightness that may be self-maintained by the lamp after the light regulation switch is closed, or causes a fan to be in a state of the minimum operating current after a speed regulator switch is closed so as to solve the problem of dead stroke (invalid stroke) upon startup as well as the problem wherein use is inconvenient.

Description

Dimming and speed regulating circuit

Technical field

The invention relates to the technical field of dimming and speed regulation, in particular to a dimming and speed regulating circuit.

Background technique

The schematic diagram of the conventional thyristor dimming and speed governor circuit is shown in Figure 1. After the switch KRP1 is closed, the power supply passes KRP1, Lo, R3, and the adjustable resistor network R '(composed of RP1, R5, R6, RP2). Charge the trigger capacitor C2. When the voltage of the trigger capacitor C2 is higher than the breakdown voltage UBo of the trigger diode D3, the trigger diode D3 is turned on. After D3 is turned on, a certain current passes through the control electrode G of the triac TR1. To the first anode, because the on-state voltage of the trigger diode D3 decreases and is smaller than a certain value of the breakdown voltage, a voltage drop occurs in the trigger capacitor C2. At this time, the energy originally stored in the trigger capacitor C2 passes through the trigger diode D3, The control electrode of the triac TR1 and the first anode of the triac TR1 are discharged, resulting in a higher discharge current superimposed on the control electrode of the triac TR1 flowing through its first anode current. TR1 provides the trigger current, and the triac TR1 is turned on. The power is supplied to the load RL through the triac TR1, and the load RL works. By adjusting the resistance of the RP1 rheostat, the resistance of the resistor network R 'can be adjusted. (RP2 is fine-tuning Resistor), to change the trigger capacitor C2 charging current and charging time, thus changing the size of the triac TR1 ON time i.e. the opening angle, dimming control of the lamp RL.

Due to the following constraints:

(1) The working conditions of the triac must be met at the same time: ① The current flowing through the thyristor control electrode must be greater than the thyristor trigger current IGT; ② The current flowing through the thyristor anode must be greater than the thyristor Latching Current (Latching Current);

(2) The continuous working conditions after the triac is turned on must be satisfied: the current that continuously flows through the thyristor anode after the triac is turned on must be greater than the holding current of the thyristor (Holding Current);

(3) Capacitive or inductive load RL has the start-up (start-up) capacity and the minimum maintenance working capacity when it is turned on. It can also be understood as the startup current and the minimum maintenance working current. Generally, its startup current is greater than the minimum maintenance working current. .

Based on the reasons (1), (2), and (3) above and that the thyristor's holding current is much larger than the sustaining current under normal conditions and the load's startup current is greater than the minimum maintaining working current, etc. The optical speed governor sets the resistance value of the adjustable resistor network R ′ through the following two methods.

One method is to satisfy ① in the above (1), that is, the current flowing through the thyristor control electrode must be greater than the trigger current IGT of the thyristor, and at the same time, the thyristor triggers conduction by meeting the maintenance working conditions of the above (2). The current that continuously flows through the thyristor anode must be greater than its sustaining current. The disadvantage of this design is that the load will not work immediately after the dimmer switch KRP1 is closed. In the initial state, the RP1 adjustable resistor must be adjusted. Maximum value) a certain stroke to reduce its resistance value, increase the charging current to the trigger capacitor C2, shorten the charging time, and increase the opening angle of the triac to ensure that the triac flows through the triac after the trigger is turned on The current is greater than its holding current and meets the load's start-up current, so that the circuit connected to the load can keep working and meet the power supply to the load. However, it has the following defects: if the load is a lamp, the light has reached a certain brightness (higher than the minimum brightness that the lamp itself can sustain), and when a smaller light brightness is needed, the RP1 adjustable resistor needs to be adjusted in the opposite direction. This situation is inconvenient and there will be a certain dead stroke (invalid stroke) after starting up; if the load is a fan, there is a contradiction in speed;

The other method is to directly meet ① in (1) above, that is, the current flowing through the thyristor control electrode must be greater than the trigger current IGT of the thyristor, and at the same time, ② flowing through the thyristor in (1) The current of the anode must be greater than its holding current, and at the same time meet the start-up and startup current of the load, so that the circuit connected to the load keeps working and meets the power supply to the load. At this time, if the load is a lamp, it will achieve greater brightness as soon as it is turned on (than the lamp itself). The minimum brightness that can be self-maintained is high); if the load is a fan, its speed will work at a high level when it is turned on. If a smaller light brightness is required or the speed of the fan is lower, the speed cannot be adjusted. There are inconveniences.

Summary of the Invention

In order to solve the technical problems in the prior art, the present invention provides a dimming and speed-adjusting circuit. Through structural improvement, the work of the lamp after the dimming switch is closed is at or close to the minimum brightness state that the lamp itself can maintain. Or, the fan is kept at the minimum maintaining current state after the governor switch is closed, so as to solve the problems of dead stroke (invalid stroke) and inconvenience in starting up (after the dimming switch and the speed switch are closed).

The technical solution adopted by the present invention to solve the above technical problems is to provide a dimming and speed regulating circuit, which includes a main trigger circuit connected in series between a live wire terminal and a neutral wire terminal; the main trigger circuit includes an adjustable resistor network; It also includes a compensation circuit in parallel with the adjustable resistance network. The compensation circuit contains a switching actuator. The compensation circuit provides current compensation to the adjustable resistance network for a period of time after the power switch is closed to meet the load. Turn on the startup current and make the switching actuator in the compensation circuit continuously conductive during this period, so that the load brightness or load speed can be adjusted through the adjustable resistor network and the switching actuator in the compensation circuit; the power switch It is connected to the live wire terminal; the switching actuator in the compensation circuit includes thyristor, MOS tube, IGBT and / or thyristor.

As a preferred solution of the present invention, the switching actuator of the compensation circuit is a controlled mechanical timing switch, a controlled electronic timing switch, and / or a photocoupler switch.

As a preferred solution of the present invention, the controlled mechanical timing switch includes a relay.

As a preferred solution of the present invention, the controlled electronic timing switch includes a transistor, a MOS transistor, a thyristor, a thyristor, an IGBT, and / or a photocoupler switch.

As a preferred solution of the present invention, the compensation circuit further includes a microcontroller; the microcontroller is configured to perform the controlled mechanical timing switch, the controlled electronic timing switch, and / or the photocoupler switch control.

As a preferred solution of the present invention, the controlled mechanical timing switch and the controlled electronic timing switch use a gradual or steady state of the capacitor charging process to realize the timing, and a dedicated time base integrated circuit is used to implement the timing. And / or adopt the one-chip computer to realize the timing.

As a preferred solution of the present invention, the dimming and speed regulating circuit further includes at least one triggering diode connected in series between the adjustable resistor network input terminal and a load.

As a preferred solution of the present invention, the compensation circuit includes: a fourth diode, a fifth diode, a seventh resistor, an eighth resistor, a normally open relay, a sixth diode, a seventh diode, Rectifier bridge stack, ninth resistor, voltage stabilization module, fourth capacitor, tenth resistor, eleventh resistor, and second switch tube; the cathode of the fourth diode, the anode of the fifth diode, and the rectifier bridge An AC input terminal of the stack is respectively connected to the input terminal of the adjustable resistance network; the anode of the fourth diode, the seventh resistor, the first contact of the relay, and the cathode of the sixth diode are connected in series. The anode of the fifth diode, the eighth resistor, the second contact of the relay, and the anode of the seventh diode are connected in series; the anode of the sixth diode and the seventh diode The cathode is respectively connected to the output terminal of the adjustable resistance network; the other AC input terminal of the rectifier bridge stack is connected to the load; the DC output terminal of the rectifier bridge stack is connected to the stable via the ninth resistor. The input end of the voltage module; the output end of the voltage stabilization module passes the line of the relay And the output terminal of the voltage stabilizing module is respectively connected to one end of the tenth resistor and one end of the eleventh resistor through the fourth capacitor; The other end of the ten resistors and the output terminal of the second switch tube are respectively connected to another DC output of the rectifier bridge stack; the other end of the eleventh resistor is connected to the control terminal of the second switch tube.

As a preferred solution of the present invention, the compensation circuit includes: a fourth diode, a fifth diode, a seventh resistor, an eighth resistor, a sixth diode, a seventh diode, a rectifier bridge stack, A third capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a voltage regulator, a first switch, a second switch, and a third switch; the cathode of the fourth diode The anode of the fifth diode and an AC input terminal of the rectifier bridge stack are respectively connected to the input terminal of the adjustable resistance network; the anode of the fourth diode, the third switch tube, the seventh resistor, The cathode of the sixth diode is connected in series in sequence; the cathode of the fifth diode, the eighth resistor, the first switch tube, and the anode of the seventh diode are connected in series in sequence; the anode of the sixth diode The cathode of the seventh diode is respectively connected to the output terminal of the adjustable resistance network; the other AC input terminal of the rectifier bridge stack is connected to the load; The ninth resistor, the tenth resistor, and the second switching transistor are respectively connected to the control of the first switching transistor. Terminal, the control terminal of the third switch tube, and the input terminal of the second switch tube; one end of the eleventh resistor is connected between the ninth resistor and the tenth resistor; the other of the eleventh resistor is One end is connected to one end of the third capacitor and the cathode of the Zener tube respectively; the anode of the Zener tube is connected to the control terminal of the second switch tube through the twelfth resistor; the third The other end of the capacitor is connected to the other DC output end of the rectifier bridge stack.

As a preferred solution of the present invention, the compensation circuit includes: a seventh diode, an eighth diode, an eighth resistor, a ninth resistor, a tenth resistor, a twelfth resistor, a third capacitor, and a voltage regulator. A first switch tube and a second switch tube; one end of the ninth resistor is connected to the input terminal of the adjustable resistor network; the other end of the ninth resistor is connected to one end of the eighth resistor and the One end of the tenth resistor and one end of the eleventh resistor are connected respectively; the other end of the eighth resistor is connected to the input terminal of the first switch tube; the output terminal of the first switch tube is connected to all The anode of the seventh diode is connected; the cathode of the seventh diode is connected to the output terminal of the adjustable resistance network; the cathode of the voltage regulator tube is connected to the eleventh resistor and the first Between three capacitors, the anode of the voltage regulator tube is connected to the control terminal of the second switch tube through a twelfth resistor; the control terminal of the first switch tube and the other end of the tenth resistor, the The input ends of the second switch tube are connected respectively; the output of the second switch tube The three capacitor anode of the eighth diode are respectively connected; eighth of the cathode of the diode is connected to the load.

As a preferred solution of the present invention, the compensation circuit includes a fifth diode, an eighth diode, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a voltage regulator. Tube, third capacitor, first switch tube and second switch tube; the output terminal of the first switch tube, the output terminal of the second switch tube, and the third capacitor are respectively connected to the input terminal of the adjustable resistance network Phase connection; the input end of the first switch tube is connected to the cathode of the fifth diode via an eighth resistor; the anode of the fifth diode is connected to the output terminal of the adjustable resistance network; the first The input ends of the two switching tubes are connected to the cathode of the eighth diode through the tenth resistor and the ninth resistor; the anode of the eighth diode is connected to the load; the other end of the third capacitor is connected to Between the cathode of the voltage regulator tube and the eleventh resistor; the control terminal of the first switch tube is connected between the input terminal of the second switch tube and the tenth resistor; the control of the second switch tube The terminal is connected to the anode of the Zener tube via the twelfth resistor.

With the above technical solution, compared with the prior art, the beneficial effects obtained by the present invention are:

(1) A dimming and speed regulating circuit of the present invention, by adding a controlled mechanical timing switch or a controlled electronic timing switch to the control loop to provide a certain period of time after the power is turned on (after the power switch is closed). The compensation current supplements the amount of current provided by the adjustable resistor network, thereby increasing the charging current of the trigger capacitor, and solving the problems of dead stroke (invalid stroke) at startup and the inconvenience of using the existing technology. After the switch (including dimmer switch or speed switch, etc.) is closed, the work of the lamp is at or close to the minimum brightness state that the lamp itself can maintain, or the fan is at the minimum maintaining working current state;

(2) A dimming and speed regulating circuit according to the present invention. The controlled mechanical timing switch or controlled electronic timing switch in the control loop turns off the compensation current after a certain period of time after the power is turned on, and thereafter the maintenance current is controlled by a variable resistance network. Supply to ensure that the current that the triac supplies to the load is greater than the thyristor's sustaining current or the minimum sustaining operating current of the load, so that the load enters the normal working state, and then the rheostat is adjusted to the required brightness or Speed can be achieved by trimming resistors for different loads.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a conventional dimming and speed regulating circuit diagram;

2 is a dimming and speed-adjusting circuit diagram of a controlled mechanical timing switch of the present invention;

FIG. 3 is a dimming and speed-adjusting circuit diagram of a controlled electronic timing switch of the present invention; FIG.

FIG. 4 is a comparison between a voltage waveform diagram of the regulating circuit of the present invention and a voltage waveform diagram of the prior art;

5 is a circuit diagram of a dimming and speed regulating circuit according to the first embodiment of the present invention;

6 is a circuit diagram of a dimming and speed regulating circuit according to a second embodiment of the present invention;

7 is a circuit diagram of a dimming and speed regulating circuit according to a third embodiment of the present invention;

FIG. 8 is a circuit diagram of a dimming and speed regulating circuit according to the fourth embodiment of the present invention.

detailed description

The technical solution according to the present invention will be described in detail below with reference to the drawings and embodiments.

A dimming and speed regulating circuit of the present invention includes a main trigger circuit connected in series between a live wire terminal and a neutral line terminal; the main trigger circuit includes an adjustable resistor network; the dimming and speed regulating circuit further includes a circuit with the adjustable resistor A parallel compensation circuit that includes a switching actuator. The compensation circuit provides current compensation to the adjustable resistor network for a period of time after the power switch is closed, so as to meet the load startup current of the load. The switching actuators are continuously turned on during this period, so that the load brightness or load speed can be adjusted through the adjustable resistor network and the switching actuators in the compensation circuit; the power switch is connected to the live wire terminal; in the compensation circuit The switching actuators include, but are not limited to, thyristors, MOS transistors, IGBTs or thyristors, and combinations of one or more of them; the loads include, but are not limited to, lamps or fans.

The power switch includes, but is not limited to, a dimming switch or a speed regulating switch; the switch execution element of the compensation circuit is one or a combination of a controlled mechanical timing switch and a controlled electronic timing switch; The controlled mechanical timing switch includes a relay; the controlled electronic timing switch includes a transistor, a MOS tube, a thyristor, a thyristor, and / or a photocoupler switch. The controlled mechanical timing switch, the controlled electronic timing switch or the photocoupler switch in the compensation circuit may be controlled by a general combination logic circuit, or may be controlled by a circuit including a microcontroller.

Specifically, as shown in FIG. 1, the main trigger circuit includes a third resistor R3, an adjustable resistor network, a third trigger diode D3, a triac TR1, and a second capacitor C2; the power switch KRP1 passes through a band of iron The inductor L0 of the core is connected to the third resistor R3; the third resistor R3, the adjustable resistor network, the third trigger diode D3, the triac TR1, and the load RL are connected in series in sequence; the load RL Connected to the neutral terminal N; the output of the adjustable resistance network is connected to one end of the third trigger diode D3 and one end of the second capacitor C2; the other end of the second capacitor C2, The first anode of the triac TR1 is connected to the load RL, respectively; the other end of the third trigger diode D3 is connected to the control pole of the triac TR1; the bidirectional thyristor The second anode of the silicon TR1 is connected to the switching power supply.

The adjustable resistor network includes a rheostat RP1, a fifth resistor R5, a sixth resistor R6, and a trimmer resistor RP2; the sixth resistor R6 and the trimmer resistor RP2 are connected in series with the rheostat RP1, the fifth resistor R5 Connected in parallel; the varistor RP1 is connected to the power switch KRP1 and is controlled by the power switch KRP1. In the initial state, the resistance value of the varistor RP1 is the largest. By adjusting the power switch KRP1, the resistance of the varistor RP1 gradually decreases.

The dimming and speed regulating circuit further includes a first trigger diode D1 and a second trigger diode D2; the first trigger diode D1 and the second trigger diode D2 are connected in series between the adjustable resistor network input terminal and the load RL In order to provide a relatively constant and reliable working voltage for the control of the compensation circuit, thereby achieving more accurate control. It should be noted that, in specific implementation, there may be one, two or more trigger diodes connected in series between the adjustable resistor network input terminal and the load RL.

Referring to FIG. 2 to FIG. 4, according to the present invention, according to the operating conditions and characteristics of the triac TR1 being turned on and maintained, and the characteristics of the start-up startup current and the minimum maintained operating current of the load RL, the adjustable resistance network A compensation circuit including a controlled mechanical timing switch or a controlled electronic timing switch is connected in parallel to achieve a certain period of time T (timed off time, T is a number of alternating cycles of the AC power supply) after the power is turned on. The compensation current supplements the amount of current provided by the adjustable resistor network to increase the charging current of the second capacitor C2 (trigger capacitor), so that the second capacitor C2 is charged before t1 is turned on, because the third trigger diode D3 is turned on. After it is turned on, its on-voltage decreases and is less than a certain value of the breakdown voltage, and a voltage difference occurs in the second capacitor C2. At this time, the energy originally stored in the second capacitor C2 passes through the third trigger diode D3 and the triac TR1 at the same time. The control electrode and the first anode of the triac TR1 discharge, generating a higher discharge current superimposed on the control electrode of the triac TR1 flowing through its first anode current to form and control the bidirectional thyristor. TR1 provides the trigger current, and the triac TR1 is turned on. As shown in FIG. 4, the energy provided by the conventional power supply is A. The energy provided by the power supply during the T period of the present invention is increased to A + B; Provide and flow a larger holding current or start-up current that is greater than the triac TR1, so that the triac TR1 is continuously turned on during the T period, and after the T time is turned off, the compensation current enters In a stable state, the energy that triggers the control network is then supplied by the variable resistance network, and at the same time, it ensures that the current flowing from the triac TR1 to the load RL is greater than the thyristor's sustaining current or the minimum sustaining operating current of the load RL, so that the load RL enters the normal working state, and then adjusts the varistor RP1 to achieve the required brightness or speed according to the actual needs of the user. Different load RL can be realized by trimming resistor RP2. The compensation circuit of the present invention can effectively solve the problems of dead stroke (invalid stroke) and inconvenience during use. The work of the load RL after the power switch KRP1 is closed is at or near the minimum self-sustainable working condition. , And then adjust the rheostat RP1 according to the actual needs of the user to achieve the required operating conditions.

In the figure 4, Ui represents an AC power source; Uc2 represents a change in the charge capacity of the second capacitor C2; Igt represents a current provided by the triac TR1, including the current output by the adjustable resistor network and the current output by the compensation circuit And; URL1 indicates the AC power passed on the load RL when the compensation circuit is not added; URL2 indicates the AC power passed on the load RL when the compensation is added.

Example 1

As shown in FIG. 5, in this embodiment, the ABC circuit network in the dashed frame constitutes a compensation circuit composed of a relay and a corresponding controlled electronic timing-off switch to implement a compensation current, which specifically includes a fourth diode D4 and a fifth diode Diode D5, seventh resistor R7, eighth resistor R8, normally open relay, sixth diode D6, seventh diode D7, rectifier bridge stack BD1, ninth resistor R9, voltage regulator module IC1, fourth capacitor C4, the tenth resistor R10, the eleventh resistor R11, and the second switching transistor Q2; the cathode of the fourth diode D4, the anode of the fifth diode D5, and an AC input terminal of the rectifier bridge stack BD1 are respectively connected with The input ends of the adjustable resistance network are connected; the anode of the fourth diode D4, the seventh resistor R7, the first contact K1 of the relay, and the cathode of the sixth diode D6 are connected in series; The cathode of the fifth diode D5, the eighth resistor R8, the second contact K2 of the relay, and the anode of the seventh diode D7 are connected in series in sequence; the anode of the sixth diode D6 and the seventh diode The cathode of D7 is respectively connected to the output end of the adjustable resistance network; the other AC input of the rectifier bridge stack BD1 The terminal is connected to the load RL; the DC output terminal of the rectifier bridge stack BD1 is connected to the input terminal of the voltage stabilization module IC1 through the ninth resistor R9; the output terminal of the voltage stabilization module IC1 is connected to the relay coil JD1 is connected to the input of the second switch Q2; the output of the voltage stabilization module IC1 is connected to one end of the tenth resistor R10 and the eleventh resistor R11 via the fourth capacitor C4, respectively. One end; the other end of the tenth resistor R10 and the output end of the second switching tube Q2 are respectively connected to another DC output of the rectifier bridge stack BD1; the other end of the eleventh resistor R11 is connected to the first Control terminal of two switching tubes Q2.

In this embodiment, the second switching transistor Q2 is an NPN transistor, and the control terminal of the second switching transistor Q2 corresponds to the base of the transistor; the input terminal of the second switching transistor Q2 corresponds to the collector of the transistor; The output of the second switching transistor Q2 corresponds to the emitter of the triode.

In this embodiment, when the power supply is in the positive half cycle, after the switch KRP1 is closed, the power supply charges the second capacitor C2 via the inductor coil L0, the third resistor R3, and the adjustable resistor network, and at the same time via the rectifier bridge stack BD1 and the ninth resistor R9 The voltage stabilization module IC1 provides working power for the two-contact normally open relay JD1. The power source charges the fourth capacitor C4, and provides the bias voltage to the second switch Q2 via the eleventh resistor R11. The second switch Q2 is turned on. The relay JD1 works, the contacts K1 and K2 are closed, and the power supply passes the inductance coil LO, the third resistor R3, the fifth diode D5, the eighth resistor R8, the second contact K2, and the seventh diode D7 to the second capacitor. C2 charges.

When the power supply is in the negative half cycle, after the switch KRP1 is closed, the power supply charges the second capacitor C2 via the inductor coil L0, the third resistor R3, and the adjustable resistor network, and at the same time via the rectifier bridge stack BD1, the ninth resistor R9, and the voltage regulator module IC1 Provide working power for the double-contact normally open relay JD1. The power source charges the fourth capacitor C4, and provides the bias voltage to the second switching tube Q2 via the eleventh R11. Q2 is turned on, the relay works, and the contacts K1 and K2 are closed. The power source charges the second capacitor C2 via the inductor L0, the third resistor R3, the fourth diode D4, the seventh resistor R7, the contact K1, and the sixth diode D6.

In this embodiment, after the time T of the fourth capacitor C4 (T is several alternating periods of the power supply), the charging of the fourth capacitor C4 ends, the second switch Q2 loses the bias current, the second switch Q2 is turned off, and the relay The JD1 coil is de-energized, the contacts K1 and K2 are disconnected, and the compensation current provided by the compensation circuit is suspended, so that the load RL enters the normal working state, and then the rheostat RP1 is adjusted to achieve the required working conditions according to the actual needs of the user. This is achieved by adjusting the trimmer resistor RP2.

Example 2

As shown in FIG. 6, in this embodiment, the ABC circuit network in the dashed frame constitutes a compensation circuit for controlling the electronic timing switch to realize the compensation current, which specifically includes a fourth diode D4, a fifth diode D5, a first diode Seven resistors R7, eighth resistors R8, sixth diode D6, seventh diode D7, rectifier bridge stack BD1, third capacitor C3, ninth resistor R9, tenth resistor R10, eleventh resistor R11, first Twelve resistor R12, voltage regulator ZD1, first switch Q1, second switch Q2, and third switch Q3; the cathode of the fourth diode D4, the anode of the fifth diode D5, and a rectifier bridge An AC input terminal of the stack BD1 is respectively connected to the input terminal of the adjustable resistance network; the anode of the fourth diode D4, the third switch Q3, the seventh resistor R7, and the sixth diode D6 The cathodes are connected in series; the cathode of the fifth diode D5, the eighth resistor R8, the anode of the first switch Q1, and the anode of the seventh diode D7 are connected in series; the anode of the sixth diode D6, The cathode of the seventh diode D7 is respectively connected to the output terminal of the adjustable resistance network; the other AC input of the rectifier bridge stack BD1 Connected to the load RL; the DC output terminal of the rectifier bridge stack BD1 is connected to the control terminal and the second switch tube Q1 of the first switch tube Q1 via the ninth resistor R9, the tenth resistor R10, and the second switch tube Q2, respectively. The control terminal of the third switching transistor Q3 and the input terminal of the second switching transistor Q2; one end of the eleventh resistor R11 is connected between the ninth resistor R9 and the tenth resistor R10; the eleventh resistor The other end of R11 is connected to one end of the third capacitor C3 and the cathode of the Zener ZD1 respectively; the anode of the Zener ZD1 is connected to the second switch Q2 through the twelfth resistor R12. The other end of the third capacitor C3 is connected to the other DC output end of the rectifier bridge stack BD1.

In this embodiment, the first switch Q1, the second switch Q2, and the third switch Q3 are all NPN transistors, and the control end of each switch corresponds to the base of the transistor; the input end of each switch corresponds to the transistor. Collector; the output of each switch corresponds to the emitter of the triode.

In this embodiment, when the power supply is in the positive half cycle, after the switch KRP1 is closed, the power supply charges the second capacitor C2 via the inductance coil L0, the third resistor R3, and the adjustable resistance network, and at the same time, the power supply passes the inductance coil LO, The third resistor R3, the fifth diode D5, the eighth resistor R8, the first switch Q1, and the seventh diode D7 charge the second capacitor C2. After the power is turned on, the first switch is simultaneously passed through the rectifier bridge stack BD1 to the first switch. The tube Q1 provides power, so a positive bias is provided to the first switching tube Q1 within T time, and the first switching tube Q1 is turned on immediately after turning on.

When the power supply is in the negative half cycle, after the switch KRP1 is closed, the power supply charges the second capacitor C2 via the inductor coil L0, the third resistor R3, and the adjustable resistor network, and at the same time, the power supply passes the inductor coil LO, the third resistor R3, The fourth diode D4, the third switching transistor Q3, the seventh resistor R7, and the sixth diode D6 charge the second capacitor C2. After the power is turned on, the third switching transistor Q3 is powered by the rectifier bridge stack BD1 at the same time. Therefore, a positive bias is provided to the third switching transistor Q3 within the time T, and the third switching transistor Q3 is turned on after being turned on.

The timing off time T is several alternating cycles of the power supply. The specific implementation principle is as follows: the third capacitor C3 in the compensation circuit is charged to the breakdown voltage of the Zener tube ZD1 and the Zener ZD1 breaks through after T time. The twelfth resistor R12 provides a forward bias current to the second switch Q2, the second switch Q2 is turned on, the first switch Q1 and the third switch Q3 are turned off, and the charging current for the second capacitor C2 is ended, The compensation current provided by the compensation circuit is suspended, and then triggered by the main trigger control loop, so that the load RL enters the normal working state, and then the varistor RP1 is adjusted to achieve the required working conditions according to the actual needs of the user. Different loads can be adjusted by adjusting the trimmer resistors .

Example 3

Referring to FIG. 7, in this embodiment, the ABC circuit network in the dashed frame constitutes a compensation circuit for controlling the electronic timing switch to realize the compensation current, which specifically includes a seventh diode D7, an eighth diode D8, and an eighth resistor. R8, ninth resistor R9, tenth resistor R10, twelfth resistor R12, third capacitor C3, voltage regulator ZD1, first switch Q1 and second switch Q2; one end of the ninth resistor R9 is connected to all The input terminal of the adjustable resistor network is connected; the other end of the ninth resistor R9 is connected to one end of the eighth resistor R8, one end of the tenth resistor R10, and one end of the eleventh resistor R11, respectively. Connection; the other end of the eighth resistor R8 is connected to the input terminal of the first switching tube Q1; the output terminal of the first switching tube Q1 is connected to the anode of the seventh diode D7; The cathode of the seventh diode D7 is connected to the output terminal of the adjustable resistance network; the cathode of the voltage regulator tube ZD1 is connected between the eleventh resistor R11 and the third capacitor C3, and the stable The anode of the pressure tube ZD1 is connected to the control terminal of the second switching tube Q2 through a twelfth resistor R12; The control terminal of the first switching tube Q1 is connected to the other end of the tenth resistor R10 and the input terminal of the second switching tube Q2, respectively; the output terminal of the second switching tube Q2 is connected to the three capacitors, the first The anodes of the eight diodes D8 are connected respectively; the cathodes of the eighth diode D8 are connected to the load RL.

In this embodiment, the first switch Q1 and the second switch Q2 are NPN transistors, and the control end of each switch corresponds to the base of the transistor; the input end of each switch corresponds to the collector of the transistor; each switch The output end corresponds to the emitter of the transistor.

In this embodiment, when the power supply is in the positive half cycle, after the switch KRP1 is closed, the power supply charges the second capacitor through the inductance coil L0, the third resistor R3, and the adjustable resistance network, and at the same time, the power supply passes the inductance coil L0, the first The three resistors R3, the ninth resistor R9, the eighth resistor R8, the first switching transistor Q1, and the seventh diode D7 charge the second capacitor C2. After the power is turned on, the first switching transistor Q1 is provided through the ninth resistor R9 at the same time. The power supply, therefore, provides a positive bias to the first switching transistor Q1 within T time, and the first switching transistor Q1 is turned on immediately after being turned on.

When the power supply is in the negative half cycle, after the switch KRP1 is closed, the power supply charges the second capacitor via the inductor coil L0, the third resistor R3, and the adjustable resistor network. The compensation circuit is due to the pair of the seventh diode D7 and the eighth diode D8. The negative half cycle is isolated and cannot form a current loop.

This compensation circuit only uses the positive half cycle for charging compensation, and plays the role of compensating current within the timing off time T; the timing off time T is several alternating cycles of the power supply, and the specific implementation principle is as follows: the third capacitor in the above compensation circuit C3 is charged to the breakdown voltage of Zener ZD1 after T time, Zener ZD1 breaks through, and provides forward bias current to the second switch Q2 through the twelfth R12, and the second switch Q2 is turned on. The first switch Q1 is turned off, the charging current to the second capacitor is terminated, the compensation current provided by the compensation circuit is stopped, and then triggered by the main trigger control loop to bring the load RL into a normal working state. To achieve the required working conditions, different loads can be achieved by adjusting the trimmer resistor RP2.

Example 4

As shown in FIG. 8, in this embodiment, the ABC circuit network in the dashed line frame constitutes a compensation circuit of controlled electronic timing switch to realize the compensation current, which specifically includes: a fifth diode D5, an eighth diode D8, a first diode Eight resistors R8, ninth resistor R9, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, voltage regulator ZD1, third capacitor C3, first switch Q1 and second switch Q2; said An output terminal of the first switching tube Q1, an output terminal of the second switching tube Q2, and an end of the third capacitor C3 are respectively connected to the input terminal of the adjustable resistance network; the input terminal of the first switching tube Q1 is The eight resistor R8 is connected to the cathode of the fifth diode D5; the anode of the fifth diode D5 is connected to the output terminal of the adjustable resistance network; the input terminal of the second switch tube Q2 passes through the first Ten resistors R10 and ninth resistor R9 are connected to the cathode of the eighth diode D8; the anode of the eighth diode D8 is connected to the load RL; the other end of the third capacitor C3 is connected to the voltage regulator Between the cathode of the tube ZD1 and the eleventh resistor R11; the control end of the first switching tube Q1 is connected to the first The input terminal of the two switching tubes Q2 is between the tenth resistor R10; the control terminal of the second switching tube Q2 is connected to the anode of the voltage stabilizing tube ZD1 via the twelfth resistor R12.

In this embodiment, when the power supply is in the positive half cycle and the switch KRP1 is closed, the power supply charges the second capacitor through the inductor L0, the third resistor R3, and the adjustable resistor network. The compensation circuit is caused by the fifth diode D5 and The eighth diode D8 isolates the positive half cycle and cannot form a current loop.

When the power supply is in the negative half cycle, after the switch KRP1 is closed, the power supply charges the second capacitor via the inductor coil L0, the third resistor R3, and the adjustable resistor network, and at the same time, the power supply passes the inductor coil L0, the third resistor R3, the first resistor A switch Q1, an eighth resistor R8, and a fifth diode D5 charge the second capacitor C2. After the power is turned on, the first switch Q1 is also supplied with power by the eighth diode D8 at the same time. The first switching tube Q1 provides a positive bias, and the first switching tube Q1 is turned on immediately after being turned on.

This compensation circuit only uses the negative half cycle for charging compensation, and plays the role of compensating current within the timing off time T; the timing off time T is several alternating cycles of the power supply, and the specific implementation principle is as follows: the third capacitor in the above compensation circuit C3 is charged to the breakdown voltage of Zener ZD1 after T time, Zener ZD1 is broken through, and the twelfth resistor R12 provides a forward bias current to the second switch Q2, and the second switch Q2 is turned on. When the first switch Q1 is turned off, the charging current to the second capacitor C2 is ended, the compensation current provided by the compensation circuit is stopped, and then triggered by the main trigger control loop to bring the load RL into a normal working state, and then adjusted according to the actual needs of the user Rheostat RP1 achieves the required working conditions. Different loads can be achieved by adjusting the trimmer resistor RP2.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention or modify it into equivalent equivalent embodiments without departing from the scope of the technical solution of the present invention. . Therefore, without departing from the content of the technical solution of the present invention, any simple modifications, equivalent changes, and modifications made to the above embodiments in accordance with the technical essence of the present invention should fall within the protection scope of the technical solution of the present invention.

Industrial applicability

The invention uses an adjustable resistor network to connect a compensation circuit in parallel, and uses the compensation circuit to provide current compensation for the adjustable resistor network within a period of time after the power switch is closed, so as to meet the load startup current of the load and make the compensation circuit The switch actuator is continuously turned on during this period; the work of the lamp is at or close to the minimum self-sustainable brightness state after the dimming switch is closed, or the fan is at the minimum maintaining working current after the governor switch is closed. State to solve the problems of dead stroke (invalid stroke) and inconvenience in starting up (after the dimmer switch and speed switch are closed). The compensation circuit is mainly composed of a fourth diode, a fifth diode, a seventh resistor, an eighth resistor, a normally open relay, a sixth diode, a seventh diode, a rectifier bridge stack, a ninth resistor, and a voltage regulator. Electronic components such as a module, a fourth capacitor, a tenth resistor, an eleventh resistor, and a second switch; the invention is easy to implement in industry, and the fourth diode, the fifth diode, the seventh resistor, Eighth resistor, normally open relay, sixth diode, seventh diode, rectifier bridge stack, ninth resistor, voltage regulator module, fourth capacitor, tenth resistor, eleventh resistor, second switch tube, etc. Electronic components are also easy to process in industry.

Claims

A dimming and speed regulating circuit includes a main trigger circuit connected in series between a live wire terminal and a neutral wire terminal; the main trigger circuit includes an adjustable resistor network; and is characterized in that it further includes a parallel connection with the adjustable resistor network The compensation circuit includes a switching actuator, and the compensation circuit provides current compensation for the adjustable resistor network within a period of time after the power switch is closed, so as to meet the load startup current of the load and make the compensation circuit The switching actuator in the controller is continuously turned on during this period, so that the load brightness or load speed can be adjusted through the adjustable resistor network and the switching actuator in the compensation circuit; the power switch is connected to the live wire terminal.
The dimming and speed-regulating circuit according to claim 1, wherein the switch execution element of the compensation circuit is a controlled mechanical timing switch, a controlled electronic timing switch, and / or a photocoupler switch.
The dimming speed control circuit according to claim 2, wherein the controlled mechanical timing switch includes a relay.
The dimming and speed-regulating circuit according to claim 2, wherein the controlled electronic timing switch includes a transistor, a MOS transistor, a thyristor, a thyristor, an IGBT, and / or a photocoupler switch.
The dimming and speed-adjusting circuit according to claim 2, wherein the compensation circuit further comprises a microcontroller; the microcontroller is used to turn off the controlled mechanical timing switch and controlled electronic timing shutdown. Switches and / or optocoupler switches are controlled.
The dimming and speed-regulating circuit according to claim 2, wherein the controlled mechanical timing switch and the controlled electronic timing switch use a gradual or steady state of the capacitor charging process to realize timing, A dedicated time base integrated circuit is used to implement the timing and / or a single-chip microcomputer is used to implement the timing.
The dimming and speed regulating circuit according to claim 1, wherein the dimming and speed regulating circuit further comprises at least one trigger diode connected in series between the adjustable resistor network input terminal and a load.
The dimming and speed regulating circuit according to claim 1, wherein the compensation circuit comprises: a fourth diode D4, a fifth diode D5, a seventh resistor R7, an eighth resistor R8, and a normally open relay , Sixth diode D6, seventh diode D7, rectifier bridge stack BD1, ninth resistor R9, voltage regulator module IC1, fourth capacitor C4, tenth resistor R10, eleventh resistor R11, and second switch tube Q2; the cathode of the fourth diode D4, the anode of the fifth diode D5, and an AC input terminal of the rectifier bridge stack BD1 are respectively connected to the input terminal of the adjustable resistance network; the fourth two The anode of the electrode D4, the seventh resistor R7, the first contact of the relay, and the cathode of the sixth diode D6 are connected in series; the cathode of the fifth diode D5, the eighth resistor R8, and the second of the relay The contacts and the anode of the seventh diode D7 are connected in series; the anode of the sixth diode D6 and the cathode of the seventh diode D7 are respectively connected to the output terminal of the adjustable resistance network; The other AC input terminal of the rectifier bridge stack BD1 is connected to the load; the DC output terminal of the rectifier bridge stack BD1 passes through the ninth resistor R 9 is connected to the input terminal of the voltage regulator module IC1; the output terminal of the voltage regulator module IC1 is connected to the input terminal of the second switch Q2 via the coil of the relay; the output terminal of the voltage regulator module IC1 is connected via The fourth capacitor C4 is respectively connected to one end of the tenth resistor R10 and one end of the eleventh resistor R11; the other end of the tenth resistor R10 and the output end of the second switch Q2 are respectively connected to the The other DC output of the rectifier bridge stack BD1; the other end of the eleventh resistor R11 is connected to the control end of the second switch Q2.
The dimming and speed regulating circuit according to claim 1, wherein the compensation circuit comprises: a fourth diode D4, a fifth diode D5, a seventh resistor R7, an eighth resistor R8, and a sixth two Diode D6, seventh diode D7, rectifier bridge stack BD1, third capacitor C3, ninth resistor R9, tenth resistor R10, eleventh resistor R11, twelfth resistor R12, voltage regulator ZD1, first Switch Q1, second switch Q2 and third switch Q3; the cathode of the fourth diode D4, the anode of the fifth diode D5, and an AC input terminal of the rectifier bridge stack BD1 are respectively connected with the The input terminals of the resistance-adjusting network are connected; the anode of the fourth diode D4, the third switch Q3, the seventh resistor R7, and the cathode of the sixth diode D6 are connected in series in sequence; the fifth diode The cathode of D5, the eighth resistor R8, the first switching transistor Q1, and the anode of the seventh diode D7 are connected in series; the anode of the sixth diode D6 and the cathode of the seventh diode D7 are respectively connected to the The output end of the adjustable resistance network is connected; the other AC input end of the rectifier bridge stack BD1 is connected to a load; the direct current transmission of the rectifier bridge stack BD1 Connected to the control terminal of the first switch Q1, the control terminal of the third switch Q3, and the second switch Q2 via the ninth resistor R9, the tenth resistor R10, and the second switch Q2, respectively. One end of the eleventh resistor R11 is connected between the ninth resistor R9 and the tenth resistor R10; the other end of the eleventh resistor R11 and one end of the third capacitor C3, The cathodes of the Zener ZD1 are connected respectively; the anode of the Zener ZD1 is connected to the control terminal of the second switch Q2 through the twelfth resistor R12; the other end of the third capacitor C3 is connected to The other DC output terminal of the rectifier bridge stack BD1.
The dimming and speed-regulating circuit according to claim 1, wherein the compensation circuit comprises: a seventh diode D7, an eighth diode D8, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10, a twelfth resistor R12, a third capacitor C3, a voltage regulator ZD1, a first switch Q1 and a second switch Q2; one end of the ninth resistor R9 is connected to the input end of the adjustable resistance network ; The other end of the ninth resistor R9 is connected to one end of the eighth resistor R8, one end of the tenth resistor R10, and one end of the eleventh resistor R11; One end is connected to the input end of the first switching tube Q1; the output end of the first switching tube Q1 is connected to the anode of the seventh diode D7; the cathode of the seventh diode D7 is connected to The output terminals of the adjustable resistance network are connected; the cathode of the voltage regulator tube ZD1 is connected between the eleventh resistor R11 and the third capacitor C3, and the anode of the voltage regulator tube ZD1 passes through the twelfth resistor R12 is connected to the control terminal of the second switch Q2; the control terminal of the first switch Q1 and the tenth resistor R1 The other end of 0 is connected to the input end of the second switching tube Q2; the output end of the second switching tube Q2 is connected to the anode of the three capacitor C3 and the eighth diode D8; The cathode of the eighth diode D8 is connected to the load.
The dimming speed control circuit according to claim 1, wherein the compensation circuit comprises: a fifth diode D5, an eighth diode D8, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a voltage regulator ZD1, a third capacitor C3, a first switch Q1 and a second switch Q2; an output terminal of the first switch Q1, and a second switch The output end of the tube Q2 and one end of the third capacitor C3 are respectively connected to the input end of the adjustable resistance network; the input end of the first switch tube Q1 is connected to the fifth diode D5 via an eighth resistor R8. Cathode; the anode of the fifth diode D5 is connected to the output of the adjustable resistance network; the input of the second switch D2 is connected to the eighth via the tenth resistor R7 and the ninth resistor R9 The cathode of the diode D8; the anode of the eighth diode D8 is connected to the load; the other end of the third capacitor C3 is connected between the cathode of the voltage regulator tube ZD1 and the eleventh resistor R11; A control terminal of the first switching transistor Q1 is connected between an input terminal of the second switching transistor Q2 and a tenth resistor R10; The control terminal of the two switching tubes Q2 is connected to the anode of the voltage stabilizing tube via the twelfth resistor R12.