WO2012136044A1

WO2012136044A1 - Method for controlling auxiliary power circuit of dual-line dimmer

Info

Publication number: WO2012136044A1
Application number: PCT/CN2011/079058
Authority: WO
Inventors: 邹剑华; 夏清峰; 任丽君; 华桂潮
Original assignee: 英飞特电子（杭州）有限公司
Priority date: 2011-04-02
Filing date: 2011-08-29
Publication date: 2012-10-11
Also published as: CN102752900A; CN102752900B

Abstract

A method for controlling an auxiliary power circuit of a dual-line dimmer. The auxiliary power circuit comprises: an auxiliary power capacitor and a cut-off switch forming a series connection branch; and a chopping switch connected in parallel with the series connection branch. The method comprises the following steps: detecting the current auxiliary power voltage; and determining whether the auxiliary power voltage is less than a set lower limit value, and if yes, further determining whether the chopping switch is in a chopping period, and if yes, not charging the auxiliary power capacitor; and if not, charging the auxiliary power capacitor. With embodiments of the present invention, defects in the prior art can be solved, the circuit is simple, and the cost is low.

Description

Control method of auxiliary source circuit of two-wire dimmer

The present application claims priority to Chinese Patent Application No. 201110083892.2, entitled "Control Method of Auxiliary Source Circuit of Two-Wire Dimmer", filed on April 2, 2011, the entire contents of which is incorporated herein by reference. This is incorporated herein by reference.

Technical field

The present invention relates to the field of auxiliary power supply technologies, and in particular, to a method for controlling an auxiliary source circuit of a two-wire dimmer. Background technique

A dimmer is an electrical device used to change the luminous flux of a light source in a lighting device and to adjust the level of illumination. The dimmer is usually connected between the hot (hot) and the load (Dimmed Hot) to achieve dimming by changing the current effective value of the input source.

The existing common dimmer has only two connections to the grid and the load end, so it can be called a two-wire dimmer. A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), or an IGBT (Insulated Gate Bipolar Transistor) can be used in a two-wire dimmer. A semiconductor power device such as a thyristor is used as a chopper switch. The control of the grid voltage can be achieved by controlling the on/off of the chopper switch. The magnitude of the chopping angle of the chopper switch represents the magnitude of the dimming signal.

In order to meet the needs of color lighting systems, two-wire dimmers are required to have various adjustments such as color and/or brightness. Usually, the two-wire dimmer has more lines inside, and even requires a digital control method such as a single-chip microcomputer. Therefore, it is necessary to generate an auxiliary power supply for the single-chip microcomputer or other lines inside the two-wire dimmer.

Referring to Figure 1, there is shown an auxiliary source circuit diagram of a prior art two-wire dimmer. The auxiliary power supply 124 in the circuit charges the capacitor C1 with the voltage drop when the chopper switch is turned off when both the chopper switches 110 and 112 are turned off. In the positive half cycle of the sine wave, a charging circuit is formed by the diode D1, the capacitor C1, the body diode of the chopper switch 112, and the load; in the negative half cycle of the sine wave, the diode D2, the capacitor C1, the body diode of the chopper switch 112, and the load A charging loop is formed and then regulated by the auxiliary power source 124 to obtain an auxiliary voltage Vcc.

Since the acquisition of the auxiliary voltage Vcc is obtained by using the voltage generated by the chopper switch cutoff, a minimum chopping angle (chopper switch non-conduction) is required to obtain the minimum auxiliary voltage. However, even if the chopper switch does not conduct for a short time (small angle), it will cause a large electromagnetic interference to the circuit due to the sudden change of voltage and current. At the same time, the capacitor C1 will withstand the peak voltage of the grid voltage. The auxiliary power source 124 is then converted into a low voltage signal Vcc to supply power to other circuits, making the circuit costly and inefficient.

Summary of the invention

In view of the above, an object of the present invention is to provide a control method for an auxiliary source circuit of a two-wire dimmer, which can solve the defects in the prior art, and which is simple in circuit and low in cost.

In order to achieve the above object, the present invention provides a method for controlling an auxiliary source circuit of a two-wire dimmer, the auxiliary source circuit comprising: an auxiliary source capacitor and a disconnecting switch constituting a series branch; a chopper switch in parallel with the branch; the method comprises the steps of:

Step 1: Start;

Step 2: Detect the current auxiliary source voltage, determine whether the auxiliary source voltage is lower than the set lower limit value, and if yes, go to step 3; if no, return to step 1;

Step 3: determining whether the chopping switch is in a chopping period, and if so, controlling the auxiliary source capacitor to not charge Return to step 1; if no, control the auxiliary source capacitor to charge, return to step 1.

Preferably, after step 1, before step 2, the method further includes:

Step 11: Detect the current auxiliary source voltage, determine whether the auxiliary source voltage is higher than the set upper limit value, and if yes, turn off the cut-off switch, return to step 11; if no, go to step 2.

Preferably, after step 1, before entering step 11, further comprising:

Step 21: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set fault voltage value, and if so, proceeding to step 22; if not, proceeding to step 11;

Step 22: output a fault control signal, and turn off the cut-off switch;

Step 23: Determine whether the auxiliary source voltage is lower than the set fault voltage value, and if yes, go to step 11; if no, return to step 22.

Preferably, after step 1, before step 2, the method further includes:

Step 11: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step 12; if not, proceeding to step 2;

Step 12: determining whether the chopping voltage control signal is to turn on the chopping switch, if yes, turning on the chopping switch, returning to step 11; if not, turning off the chopping switch and turning off the Return the switch and return to step 11.

Preferably, after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn off the cut-off switch;

The present invention also provides a method for controlling an auxiliary source circuit of a two-wire dimmer, the auxiliary source circuit comprising: an auxiliary source capacitor and a cut-off switch constituting a series branch; a chopper switch connected in parallel with the series branch;

The method includes the following steps:

Step 1: start;

Step 2: determining whether the chopping switch is in a chopping cycle, and if yes, returning to step 1; if not, proceeding to step 3;

Step 3: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than a set lower limit value, and if so, controlling the auxiliary source capacitor charging, returning to step 1; if not, controlling the auxiliary source capacitor is not Charge and return to step 1.

Preferably, after step 1, before step 2, the method further includes:

Preferably, after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn off the cut-off switch;

Step 23: Determine whether the auxiliary source voltage is lower than a set fault voltage value, and if yes, proceed to step 11; if no, return to step 22. Preferably, after step 1 and before step 2, the method further includes:

Preferably, after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn off the cut-off switch;

An embodiment of the present invention further provides a method for controlling an auxiliary source circuit of a two-wire dimmer, the auxiliary source circuit comprising: a rectifying device and an auxiliary source capacitor connected in series to form a series branch; a disconnecting switch and the series branch Parallel to form a parallel branch; the chopper switch is in series with the parallel branch; the method comprises the steps of:

Step 1: start;

Step 3: Determine whether the chopper switch is in a chopping period. If yes, control the auxiliary source capacitor to not charge, return to step 1; if not, control the auxiliary source capacitor to charge, and return to step 1.

Preferably, after step 1, before step 2, the method further includes:

Step 11: Detect the current auxiliary source voltage, determine whether the auxiliary source voltage is higher than the set upper limit value, and if yes, turn on the cut-off switch, return to step 11; if no, go to step 2.

Preferably, after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn on the cut-off switch;

The invention also provides a method for controlling an auxiliary source circuit of a two-wire dimmer, the auxiliary source circuit comprising: a rectifying device and an auxiliary source capacitor connected in series to form a series branch; the disconnecting switch is connected in parallel with the series branch, Forming a parallel branch; the chopper switch is in series with the parallel branch;

The method includes the following steps:

Step 1: start;

Preferably, after step 1 and before step 2, the method further includes: Step 11: Detect the current auxiliary source voltage, determine whether the auxiliary source voltage is higher than the set upper limit value, and if yes, turn on the cut-off switch, return to step 11; if no, go to step 2.

Preferably, after step 1, before entering step 11, further comprising:

Step 21: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set fault voltage value, and if yes, proceeding to step 22; if not, proceeding to step 11;

Step 22: output a fault control signal, and turn on the cut-off switch;

Step 23: Determine whether the auxiliary source voltage is lower than the set fault voltage value. If yes, go to step 11; if no, return to step 22.

According to a specific embodiment provided by the present invention, the present invention discloses the following technical effects:

In the method of the embodiment of the present invention, when the auxiliary source voltage is lower than a predetermined value, at least one chopper switch is turned off, the auxiliary source capacitor is replaced by the off chopper switch and the AC power source, and the two lines are dimmed. The load at the output of the device forms a loop, and the AC power source charges the auxiliary source capacitor to obtain the auxiliary source voltage. When the auxiliary source voltage reaches a certain value, the chopper switch is fully turned on, operates in a saturated state, and stops charging the auxiliary source capacitor. In order to reduce the loss of the circuit; when the two-wire dimmer is in the chopping cycle, the charging circuit to the auxiliary source capacitor is cut off.

According to the control method of the embodiment of the present invention, since the chopper switch operates in the switching state and the nonlinear state, the auxiliary source circuit of the two-wire dimmer can be made small in loss and high in efficiency; The method and device can make the auxiliary source circuit of the two-wire dimmer not require a minimum chopping angle limit, so the electromagnetic interference is small.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. For the embodiments, those skilled in the art can obtain other drawings according to the drawings without any creative labor.

1 is an auxiliary source circuit diagram of a prior art two-wire dimmer;

2 is a structural diagram of an auxiliary source circuit of a two-wire dimmer according to Embodiment 1 of the present invention;

3 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 1 of the present invention;

3( a ) is a diagram showing a control method of an auxiliary source circuit of a two-wire dimmer according to Embodiment 1 (a) of the present invention;

4 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 2 of the present invention;

5 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 3 of the present invention;

6 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 4 of the present invention;

7 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 5 of the present invention;

8 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 6 of the present invention;

9 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 7 of the present invention;

10 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 8 of the present invention;

11 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 9 of the present invention;

12 is a waveform diagram of a chopping voltage control signal according to an embodiment of the present invention;

13 is a circuit diagram of a first implementation manner of an auxiliary source circuit according to an embodiment of the present invention;

Figure 14 is a waveform diagram of the output voltage of the circuit shown in Figure 13;

Figure 15 is a circuit diagram showing a second implementation mode of the auxiliary source circuit of the embodiment of the present invention; Figure 16 is a waveform diagram of the output voltage of the circuit shown in Figure 15;

17 is a circuit diagram of a third implementation manner of an auxiliary source circuit according to an embodiment of the present invention;

18 is a circuit diagram of a fourth implementation manner of an auxiliary source circuit according to an embodiment of the present invention;

19 is a structural diagram of an auxiliary source circuit of a two-wire dimmer according to Embodiment 2 of the present invention;

20 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 10 of the present invention;

20(a) is a flow chart showing a control method of an auxiliary source circuit of a two-wire dimmer according to Embodiment 10(a) of the present invention;

21 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 11 of the present invention;

22 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 12 of the present invention;

23 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 13 of the present invention;

24 is a circuit diagram of a fifth implementation manner of an auxiliary source circuit according to an embodiment of the present invention;

Figure 25 is a waveform diagram of the output voltage of the circuit shown in Figure 24;

26 is a circuit diagram of a sixth implementation manner of an auxiliary source circuit according to an embodiment of the present invention;

Figure 27 is a waveform diagram of the output voltage of the circuit shown in Figure 26;

28 is a circuit diagram of a seventh implementation manner of an auxiliary source circuit according to an embodiment of the present invention;

29 is a circuit diagram of an eighth implementation manner of an auxiliary source circuit according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims.

In the method for controlling the auxiliary source circuit of the two-wire dimmer according to the embodiment of the present invention, when the auxiliary source voltage is lower than a predetermined value, at least one chopper switch is turned off, and the auxiliary source capacitor is replaced by the off chopping The switch and the AC power source and the load at the output end of the two-wire dimmer form a loop, and the AC power source charges the auxiliary source capacitor to obtain an auxiliary source voltage; when the auxiliary source voltage reaches a certain value, the chopper switch is completely turned on, Working in a saturated state, stopping charging the auxiliary source capacitor, thereby reducing the loss of the circuit; when the two-wire dimmer is in the chopping cycle, the charging circuit to the auxiliary source capacitor is cut off.

The auxiliary source circuit of the two-wire dimmer of the embodiment of the invention includes: a chopper switch, an auxiliary source capacitor, and a cut-off switch. The auxiliary source capacitor and the disconnecting switch form a series branch; the chopper switch is connected in parallel with the series branch. Specifically, it can be as shown in Figure 2.

2 is a structural diagram of an auxiliary source circuit of a two-wire dimmer according to Embodiment 1 of the present invention. The auxiliary power source of the two-wire dimmer may include: a chopper switch 10, an auxiliary source capacitor 20, a disconnect switch 30, and a control device 40.

The auxiliary source capacitor 20 and the disconnecting switch 30 form a series branch; the chopper switch 10 is connected in parallel with the series branch.

When the cut-off switch 30 is turned on and the chopper switch 10 is turned off, the auxiliary source capacitor 20 and the chopping wave are turned on. The auxiliary source capacitor 20 is charged in parallel, and the auxiliary source capacitor 20 stops charging when the cut-off switch 30 is turned off or the chopper switch 10 and the cut-off switch 30 are both turned on.

The control device 40, the input signals are Vg and Vb, and outputs the first signal VI and the second signal V2. Where the input signal. The input signal Vg is a chopping voltage control signal of the two-wire dimmer, and the input signal Vb is a chopping period detection signal. The chopping period detection signal Vb and the chopping voltage control signal Vg may be generated by a chopper control circuit (the circuit is not shown).

Wherein: the chopping voltage control signal Vg is a signal for controlling the output of the chopping voltage during the chopping period of the two-wire dimmer, and when the auxiliary source capacitor 20 is not charged, when the chopping voltage control signal Vg When the signal for turning off the chopper switch 10 is output, the chopper switch 10 is turned off, and the two-wire dimmer outputs a zero voltage; when the chopping voltage control signal Vg outputs a signal for turning on the chopper switch 10 When the chopper switch 10 is turned on, the two-wire dimmer output is a non-zero voltage. If the chopper switch 10 alternately turns on and off during the half cycle of the AC power supply, the two-wire dimmer outputs a chopping voltage. If the chopper switch 10 is always turned on during the AC power supply cycle, the output voltage of the two-wire dimmer is Input AC voltage.

Wherein, the chopping period refers to: in a half cycle of inputting an alternating current power supply, the output voltage of the two-wire dimmer alternately exhibits a zero voltage and a non-zero voltage; the non-chopping period refers to: a dimmer There is no continuous zero voltage period in the output voltage. When the two-wire dimmer is in the chopping cycle, the output voltage Vo is the chopping voltage.

The chopping period detection signal Vb is a signal for detecting the chopping period of the chopper control circuit, and includes two states, a state one and a state two, that is, when the chopper control circuit controls the output voltage of the two-wire dimmer to be in a chopping period, The chopping period detection signal Vb is in state one; when the chopper control circuit controls the output voltage of the two-wire dimmer to be in a non-chopping period, the chopping period detection signal Vb is in state two. The control device 40 is configured to detect an auxiliary source voltage, output a first signal VI and a second signal V2 according to the auxiliary source voltage Vcc and the input signal Vg, and respectively control the conduction of the chopper switch 10 and the disconnect switch 30. Or shut down.

The chopper switch 10 and the output terminal are connected in series and connected in parallel across the input power supply Vin.

The output load may be a switching power supply type load, such as an LED driver, a gas discharge lamp ballast, etc.; the output end load driven light source may be an LED lamp, a fluorescent lamp, a 3⁄4 lamp, etc., and other similar characteristics. Light source.

An auxiliary source circuit corresponding to the two-wire dimmer of the first embodiment of the present invention provides an auxiliary power supply control method for a two-wire dimmer.

3 is a flow chart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 1 of the present invention. The method specifically includes the following steps:

Step S101: start;

Step S102: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S103; if not, returning to step S101;

Step S103: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S104; if not, proceeding to step S105;

Step S104: The auxiliary source capacitor 20 is not charged, and returns to step S101;

Step S105: The auxiliary source capacitor 20 is charged, and the process returns to step S101.

It should be noted that, in the first embodiment of FIG. 3, the order of execution of step S102 and step S103 is not limited, that is, the embodiment shown in FIG. 3 may also be as shown in FIG. 3(a).

Referring to FIG. 3( a ), a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 1(a) of the present invention is shown. The method specifically includes the following steps:

Step S101-a: start;

Step S102-a: determining whether the chopper switch 10 is in the chopping period, if yes, returning to step S101-a; if not, proceeding to step S103-a;

Step S103-a: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S105-a; if not, proceeding to step S104-a;

Step S104-a: The auxiliary source capacitor 20 is not charged, and returns to step S101-a;

Step S105-a: The auxiliary source capacitor 20 is charged, and the process returns to step S101-a.

3(a) is different from FIG. 3 in that steps S102 and S103 are performed in different order, but the logical relationship is the same. Specifically, the case required to obtain step S104 or obtain step S105 is shown in FIG. 3 and FIG. 3(a). All the same.

In the embodiment of the present invention, the auxiliary source circuit shown in FIG. 2:

The charging of the auxiliary source capacitor 20 in step S104 and step S104-a may be specifically: turning off the disconnecting switch 30; or further determining whether the chopping voltage control signal Vg is a conducting signal, and if so, guiding Passing the chopper switch 10, otherwise, turning off the chopper switch 10 and turning off the disconnect switch 30.

The charging of the auxiliary source capacitor 20 in step S105 and step S105-a may specifically be: turning off the chopper switch 10 and turning on the disconnecting switch 30.

The embodiment of Fig. 3 is specifically shown in Figs. 4 and 5, respectively.

It should be noted that both FIG. 3 and FIG. 3(a) can implement the present invention, and the logical relationship is the same. Therefore, in the following second embodiment, the third embodiment, the fourth embodiment, the fifth embodiment, the sixth embodiment, the seventh embodiment, the eighth embodiment, the eighth embodiment, and the ninth embodiment, the description is made by using FIG. 3 as an example. The following embodiments are not limited to FIG. 3, and FIG. 3(a) also has corresponding embodiments.

4 is a flow chart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to a second embodiment of the present invention. The method specifically includes the following steps:

Step S201: start;

Step S202: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S203; if not, returning to step S201;

Step S203: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S204; if not, proceeding to step S205;

Step S204: Turn off the disconnecting switch 30, and return to step S201;

Step S205: Turn off the chopper switch 10 and turn on the cut-off switch 30, and return to step S201.

In the method of the second embodiment of the present invention, when the disconnecting switch 30 is turned on and the chopper switch 10 is turned off, the auxiliary source capacitor 20 is connected in parallel with the chopper switch 10, and the auxiliary source capacitor 20 is Charging; when the cut-off switch 30 is turned off, the auxiliary source capacitor 20 stops charging.

5 is a flow chart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to a third embodiment of the present invention. The method specifically includes the following steps:

Step S301: start;

Step S302: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S303; if not, returning to step S301; Step S303: determining whether the chopper switch 10 is in the chopping cycle, if yes, proceeding to step S304; if not, proceeding to step S307;

Step S304: determining whether the chopping voltage control signal is to turn on the chopper switch 10, if yes, proceeding to step S305; if not, proceeding to step S306;

Step S305: Turn on the chopper switch 10, and return to step S301;

Step S306: Turn off the chopper switch 10 and turn off the disconnect switch 30, and return to step S301;

Step S307: Turn off the chopper switch 10 and turn on the cut-off switch 30, and return to step S301.

The method of the third embodiment of the present invention is different from the method of the second embodiment in that: when it is determined that the auxiliary source voltage is lower than a set lower limit value and the chopper switch 10 is in a chopping period, further determining Whether the chopping voltage control signal Vg is a signal for turning on the chopper switch 10, and if so, turning on the chopper switch 10; otherwise, turning off the chopper switch 10 and turning off the disconnecting switch 30.

6 is a flow chart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to a fourth embodiment of the present invention. The method specifically includes the following steps:

Step S401: start;

Step S402: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S403; if not, proceeding to step S404;

Step S403: Turn off the disconnecting switch 30, and return to step S401;

Step S404: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S405; if not, returning to step S401;

Step S405: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S406; if not, proceeding to step S407;

Step S406: Turn off the cut-off switch 30, return to step S404;

Step S407: Turn off the chopper switch 10 and turn on the disconnect switch 30, and return to step S404.

The difference between the method described in the fourth embodiment of the present invention and the method in the second embodiment is: when determining whether the current auxiliary source voltage is lower than the set lower limit value, first determining whether the current auxiliary source voltage is higher than the set value. The limit value, if yes, turns off the cut-off switch 30; otherwise, it further determines whether the current auxiliary source voltage is lower than the set lower limit value.

Correspondingly, referring to FIG. 7, a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 5 of the present invention is shown. The method specifically includes the following steps:

Step S501: start;

Step S502: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S503; if not, proceeding to step S504;

Step S503: Turn off the disconnecting switch 30, and return to step S501;

Step S504: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S505; if not, returning to step S501;

Step S505: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S506; if not, proceeding to step S509;

Step S506: determining whether the chopping voltage control signal is turned on the chopper switch 10, and if so, proceeds to step S507; if no, proceeds to step S508; Step S507: Turn on the chopper switch 10, return to step S504;

Step S508: Turn off the chopper switch 10 and turn off the disconnect switch 30, return to step S504;

Step S509: Turn off the chopper switch 10 and turn on the cut-off switch 30, and return to step S504.

The difference between the method described in the fifth embodiment of the present invention and the method in the third embodiment is: when determining whether the current auxiliary source voltage is lower than the set lower limit value, first determining whether the current auxiliary source voltage is higher than the set value. The limit value, if yes, turns off the cut-off switch 30; otherwise, it further determines whether the current auxiliary source voltage is lower than the set lower limit value.

Referring to FIG. 8, a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 6 of the present invention is shown. The method of the sixth embodiment differs from the fourth embodiment in that: when the auxiliary source voltage is higher than the set upper limit value, the chopper switch 10 and the cut-off switch 30 can be controlled by determining the chopping voltage control signal; When the two-wire dimmer needs to output a non-zero voltage, the control chopper switch 10 is turned on, and when the two-wire dimmer needs to output a zero voltage, the control chopper switch 10 is turned off, and the cut-off switch 30 is turned off.

The method specifically includes the following steps:

Step S601: start;

Step S602: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S603; if not, proceeding to step S606;

Step S603: determining whether the chopping voltage control signal is to turn on the chopper switch 10, and if so, proceeding to step S604; if not, proceeding to step S605;

Step S604: Turn on the chopper switch 10, and return to step S602;

Step S605: Turn off the chopper switch 10, turn off the disconnect switch 30, and return to step S602;

Step S606: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S607; if not, returning to step S602;

Step S607: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S608; if not, proceeding to step S609;

Step S608: Turn off the cut-off switch 30, and return to step S606;

Step S609: Turn off the chopper switch 10 and turn on the cut-off switch 30, and return to step S606.

In the method of the sixth embodiment of the present invention, when the auxiliary source voltage is higher than the set upper limit value, it indicates that it is not necessary to continue charging the auxiliary source capacitor 20. When the chopper switch 10 is turned on, the voltage drop across the switch is zero. No matter whether the cut-off switch 30 is turned on or off, the auxiliary source capacitor 20 is not charged. At this time, it is only necessary to ensure that the cut-off switch 30 is turned off when the chopper switch 10 is turned off. The reason why the cut-off switch 30 needs to be turned off is that when the chopper switch 10 is turned off, the voltage across it is the grid voltage. In order to ensure that the auxiliary source capacitor 20 and other devices are not destroyed, it is necessary to turn off the chopper switch 10 when it is turned off. , stop charging the auxiliary source capacitor 20. Similarly, in the method of the sixth embodiment, when the disconnecting switch 30 is turned off, the purpose of not charging the auxiliary source capacitor 20 can also be achieved.

9 is a flow chart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 7 of the present invention. The method of the seventh embodiment differs from the fifth embodiment in that: when the auxiliary source voltage is higher than the set upper limit value, the chopper switch 10 and the cut-off switch 30 can be controlled by determining the chopping voltage control signal Vg; That is, when the two-wire dimmer needs to output a non-zero voltage, the control chopper switch 10 is turned on, and when the two-wire dimmer needs to output a zero voltage, the control chopper switch 10 is turned off, and the cut-off switch 30 is turned off.

The method specifically includes the following steps: Step S701: start;

Step S702: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S703; if not, proceeding to step S706;

Step S703: determining whether the chopping voltage control signal is to turn on the chopper switch 10, and if so, proceeding to step S704; if not, proceeding to step S705;

Step S704: Turn on the chopper switch 10, and return to step S702;

Step S705: Turn off the chopper switch 10, turn off the disconnect switch 30, and return to step S702;

Step S706: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S707; if not, returning to step S702;

Step S707: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S708; if not, proceeding to step S911;

Step S708: determining whether the chopping voltage control signal is to turn on the chopper switch 10, and if so, proceeding to step S709; if not, proceeding to step S910;

Step S709: Turn on the chopper switch 10, and return to step S706;

Step S710: Turn off the chopper switch 10 and turn off the disconnect switch 30, return to step S706;

Step S711: Turn off the chopper switch 10 and turn on the disconnect switch 30, and return to step S706.

In the method of the seventh embodiment of the present invention, the step when the auxiliary source voltage is higher than the set upper limit value is similar to the step described in the sixth embodiment of Fig. 8.

In the method of the first embodiment of the present invention, the auxiliary source voltage is detected, and if the auxiliary source voltage is lower than the set lower limit value, and the chopper switch of the two-wire dimmer is in a non-chopping period, the 控制 is controlled. The wave switch 10 is turned off while controlling the cut-off switch 30 to be turned on. At this time, in the two-wire dimmer, the auxiliary source capacitor 20 and the output of the two-wire dimmer load form a loop, and the AC power source charges the auxiliary source capacitor 20 through the loop, and the auxiliary source voltage rises, the two-wire dimmer The output voltage is the difference between the input AC voltage and the auxiliary source voltage.

When the auxiliary source voltage is lower than the set lower limit value and the chopper switch 10 is in the chopping period, the cut-off switch 30 is controlled to be turned off. At this time, in the two-wire dimmer, the AC power supply stops charging the auxiliary source capacitor 20, and the auxiliary source capacitor 20 discharges energy to the load; the output voltage of the two-wire dimmer is zero. Alternatively, when the auxiliary source voltage is lower than the set lower limit value and the chopper switch 10 is in the chopping period, it is determined whether the chopping voltage control signal Vg is turned on, and if turned on, controlling the chopper switch 10 to be turned on. If it is turned off, the chopper switch 10 is controlled to be turned off, and the cut-off switch 30 is also controlled to be turned off.

When the auxiliary source voltage is higher than the set upper limit value, the cut-off switch 30 is controlled to be turned off. Alternatively, when the auxiliary source voltage is higher than the set upper limit value, it is determined whether the chopping voltage control signal Vg is turned on, and if it is turned on, controlling the chopper switch 10 to be turned on, and if turned off, controlling the The chopper switch 10 is turned off, and the cut-off switch 30 is also controlled to be turned off.

Preferably, a voltage stabilizing module or a boosting module can be provided at the output of the auxiliary source capacitor 20. The voltage stabilizing module may include a voltage stabilizing device, or a voltage stabilizing circuit composed of a voltage stabilizing device, or a linear voltage stabilizing circuit, etc.; the boosting module may be a boost converter circuit or the like, and may be, for example, a BOOST circuit.

It should be noted that, in practical applications, the set lower limit value of the auxiliary source voltage may be set higher than the voltage value when the auxiliary source circuit can operate normally. This can ensure that: when the auxiliary source voltage is lower than the set lower limit value, and the chopper switch of the two-wire dimmer is in the chopping period, that is, the auxiliary source capacitor 20 can only be discharged to the auxiliary source load. During the period of time when charging is not possible, the minimum value of the auxiliary source voltage is still guaranteed to maintain the normal operation of the auxiliary source circuit. Since the voltage of the auxiliary source capacitor 20 is equal to the voltage across the chopper switch 10 during charging, the voltage across the chopping switch 10 does not exceed the upper limit set by the auxiliary source voltage, that is, the two-wire dimmer outputs a non-zero voltage. When the output voltage is different from the AC voltage, the auxiliary source voltage upper limit value is not exceeded. For example, if the AC input voltage Vin is the grid voltage (such as HOVac, 220 Vac, or 277Vac), and the upper limit of the auxiliary source voltage Vcc is usually controlled to a few V to a dozen V, the AC input voltage Vin is much larger than the chopper switch. 10 voltage across, so the output voltage of the two-wire dimmer is equal to the AC input voltage Vin minus the voltage across the chopping switch 10, which is a non-zero voltage.

In the embodiment of the present invention, since the chopper switch 10 operates in a switching state and is in a non-linear state, the auxiliary source circuit of the two-wire dimmer has low loss and high efficiency.

The auxiliary source circuit of the embodiment of the present invention does not require a minimum chopping angle limit, and thus electromagnetic interference is small.

10 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 8 of the present invention. The method of the eighth embodiment differs from the sixth embodiment in that: before determining whether the auxiliary source voltage is higher than a set upper limit value, determining whether the auxiliary source voltage is higher than a set fault voltage value; In the set fault voltage value, the cut-off switch 30 is directly turned off, and the auxiliary source voltage is detected to be lower than the fault voltage value; if the cut-off switch 30 is turned off, the fault voltage value is still higher than the fault voltage value. Then, the fault control signal is output and the shut-off switch 30 is turned off. If the cut-off switch 30 is turned off and is lower than the fault voltage value, the fault control signal is not output and the normal operation mode is entered. When it is judged whether the auxiliary source voltage is higher than the set fault voltage value and the determination result is no, the normal operation mode is entered, and it is determined whether the auxiliary source voltage is higher than the set upper limit value.

Specifically, the method described in Embodiment 8 may include the following steps:

Step S801: start;

Step S802: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set fault voltage value, if yes, proceeding to step S803; if not, proceeding to step S805;

Step S803: outputting a fault control signal, turning off the cut-off switch 30;

Step S804: determining whether the auxiliary source voltage is lower than the set fault voltage value, if yes, proceeding to step S805; if not, returning to step S803;

Step S805: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S806; if not, proceeding to step S809;

Step S806: determining whether the chopping voltage control signal is to turn on the chopper switch 10, and if so, proceeding to step S807; if not, proceeding to step S808;

Step S807: Turn on the chopper switch 10, return to step S805;

Step S808: Turn off the chopper switch 10, turn off the disconnect switch 30, and return to step S805;

Step S809: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S810; if not, returning to step S802;

Step S810: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S811; if not, proceeding to step S812;

Step S811: Turn off the cut-off switch 30, return to step S809;

Step S812: Turn off the chopper switch 10 and turn on the disconnect switch 30, and return to step S809.

According to the method of the eighth embodiment of the present invention, before entering the normal working mode, first determining whether the auxiliary source voltage is higher than a set fault voltage value, and if it is higher than the set fault voltage value, outputting a fault control signal, In the auxiliary When the source voltage is lower than the set fault voltage value, normal operation starts, thereby realizing protection of the auxiliary source circuit. Correspondingly, referring to FIG. 11, a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 9 of the present invention is shown. The method of the ninth embodiment differs from the seventh embodiment in that: before determining whether the auxiliary source voltage is higher than a set upper limit value, it is first determined whether the auxiliary source voltage is higher than a set fault voltage value.

Specifically, the method in Embodiment 9 may include the following steps:

Step S901: start;

Step S902: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set fault voltage value, if yes, proceeding to step S903; if not, proceeding to step S905;

Step S903: output a fault control signal, turning off the cut-off switch 30;

Step S904: determining whether the auxiliary source voltage is lower than the set fault voltage value, if yes, proceeding to step S905; if not, returning to step S903;

Step S905: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S906; if not, proceeding to step S909;

Step S906: determining whether the chopping voltage control signal is to turn on the chopper switch 10, and if so, proceeding to step S907; if not, proceeding to step S908;

Step S907: Turn on the chopper switch 10, and return to step S905;

Step S908: Turn off the chopper switch 10, turn off the disconnect switch 30, and return to step S905;

Step S909: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S910; if not, returning to step S902;

Step S910: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S911; if not, proceeding to step S912;

Step S911: determining whether the chopping voltage control signal Vg is to turn on the chopper switch 10, and if so, proceeding to step S912; if not, proceeding to step S914;

Step S912: Turn on the chopper switch 10, and return to step S909;

Step S913: Turn off the chopper switch 10 and turn off the disconnect switch 30, return to step S909;

Step S914: Turn off the chopper switch 10 and turn on the cut-off switch 30, and return to step S909.

In the method of the ninth embodiment of the present invention, before entering the normal working mode, first determining whether the auxiliary source voltage is higher than a set fault voltage value, and if it is higher than the set fault voltage value, outputting a fault control signal, When the auxiliary source voltage is lower than the set fault voltage value, normal operation is started, thereby realizing protection of the auxiliary source circuit.

The embodiment of FIG. 10 (ie, embodiment eight), and the embodiment of FIG. 11 (ie, embodiment nine) are added to the embodiment of FIG. 8 (ie, embodiment six) and FIG. 9 (ie, embodiment seven). Fault protection. That is, before entering the normal operation mode, it is first determined whether the auxiliary source voltage is higher than the set fault voltage value.

If it is higher than the set fault voltage value, a fault control signal is output, and the fault signal controls the auxiliary source capacitor 20 to be uncharged, and only when the auxiliary source voltage is lower than the set fault voltage value, normal operation is started, thereby achieving Protection of the auxiliary source circuit.

At the same time, the step of step protection of the fault protection is not only applicable to the embodiment of FIG. 8 and FIG. 9, but also applies to the embodiment of FIG. 6 (ie, the fourth embodiment) and FIG. 7 (ie, the fifth embodiment), and FIG. 10 and The embodiment of FIG. 11 is similar to determining whether the auxiliary source voltage is higher than a set value before determining whether the auxiliary source voltage is higher than a set upper limit value. The barrier voltage value will not be described here.

It should be noted that, in the second to ninth embodiments of the present invention, the step of determining whether the chopper switch is in the chopping period and the step of determining whether the auxiliary source voltage is lower than the set lower limit value may be mutually In other words, in the second to the ninth, whether the chopper switch is in the chopping period or not, and then determining whether the auxiliary source voltage is lower than the set lower limit value, the specific execution process and implementation Example 1 (a) is similar and will not be repeated here.

The chopping voltage is used as an adjustment signal from the two-wire dimmer to the light source driver of the latter stage. Different adjustment signals are distinguished by the different phase angles of the chopping, and the light source driver of the subsequent stage responds to the change, and the light source can be realized. Adjustment.

The chopping voltage transmission method to which the present invention is applied is as follows: The chopping period and the non-chopping period alternately appear, and in the chopping period, the dimmer transmits the chopping voltage to the light source driver of the subsequent stage to transmit the adjustment signal.

Referring to FIG. 12, it is a waveform diagram of a two-wire dimmer output voltage Vo according to an embodiment of the present invention. As shown in Fig. 12, under the control of the chopper voltage control signal Vg, the chopper switch has two states of the dimmer output voltage Vo, state one is a non-chopping period, and state two is a chopping period.

The chopping period detection signal Vb also includes two states. When Vo is in the chopping cycle, the chopping period detection signal Vb is in state one, and after receiving the Vb as the state one, the control device 40 controls the auxiliary source capacitor to be uncharged; when Vo is in the non-chopping period, the chopping period detection signal Vb is state two, and after receiving the Vb state 2, the control device 40 controls the auxiliary source capacitor to charge below the lower limit value.

As shown in FIG. 2, in the auxiliary source circuit configuration diagram of the two-wire dimmer of the first embodiment of the present invention, the auxiliary source capacitor 20 and the disconnecting switch 30 form a series branch; the chopper switch 10 and the The series branches are connected in parallel.

When the cut-off switch 30 is turned on and the chopper switch 10 is turned off, the auxiliary source capacitor 20 is connected in parallel with the chopper switch 10, the auxiliary source capacitor 20 is charged; when the cut-off switch 30 is turned off When the chopper switch 10 and the disconnecting switch 30 are both turned on, the auxiliary source capacitor 20 stops charging.

The control device 40 is configured to detect an auxiliary source voltage, and output a first signal VI for controlling the on/off of the chopper switch 10 and a second signal V2 for controlling the on/off of the disconnect switch 30 according to the auxiliary source voltage.

Specifically, when the chopping voltage control signal Vg is the chopping switch 10, the control circuit 40 outputs a first signal VI to control the chopping switch 10 to be turned off, and outputs a second signal V2 to control the chopping switch 30 to be turned off. , causing the two-wire dimmer to output zero voltage.

In the embodiment of the present invention, the chopping voltage control signal Vg and the chopping period detection signal Vb may be provided by a chopper control circuit (not shown).

The auxiliary source capacitor 20 is controlled to be charged during a non-chopping period when the auxiliary source voltage is lower than a set lower limit value and the chopper switch 10 is in a non-chopping period.

The specific implementation form of the auxiliary source circuit of the two-wire dimmer of the first embodiment of the present invention is described in detail below. Referring to Figure 13, a circuit diagram of a first implementation of the auxiliary source circuit of the embodiment of the present invention. In the circuit shown in Fig. 13, the chopper switch 10 is composed of a rectifier bridge and a unidirectional switch.

As shown in FIG. 13, the auxiliary source capacitor 20 is C1, the disconnecting switch 30 is Q2, and the auxiliary source capacitor C1 is connected in series with the disconnecting switch Q2 to form a series branch; the series branch and the branch The rectifier bridge output terminals of the chopper switch 10 are connected in parallel, and the rectifier bridge input terminal of the chopper switch 10 is connected between one end of the input voltage Vin and one end of the output end load, and the other end of the output end load is connected to the other end of the input voltage Vin.

The series branch is specifically: the anode of the auxiliary source capacitor C1 is grounded, and the anode of the auxiliary source capacitor C1 is connected to one end of the disconnecting switch Q2. Specifically, one end of the series branch, that is, the other end of the disconnecting switch Q2, is connected to the rectifier bridge output positive end of the chopper switch 10; the other end of the series branch, that is, the negative terminal of the auxiliary source capacitor C1 is connected to the 斩The rectifier bridge of the wave switch 10 outputs a negative terminal.

The chopper switch 10 is a bidirectional switch formed by a switch tube Q1 and a rectifier bridge. The rectifier bridge is composed of a first diode D1, a second diode D2, a third diode D3, and a fourth Diode D4 is composed.

When the switch transistor Q1 is a MOS transistor, its source is connected to the common terminal of the series branch and the ground, and the drain is connected to the other end of the series branch.

The first diode D1 and the second diode D2 are connected in series, and the cathode of the first diode D1 is connected to the anode of the second diode D2. The third diode D3 is connected in series with the fourth diode D4, and the cathode of the third diode D3 is connected to the anode of the fourth diode D4.

An anode of the first diode D1 and an anode of the third diode D3 are connected to a source of the switching transistor Q1; a cathode of the second diode D2 and the fourth diode The cathode of D4 is connected to the drain of the switching transistor Q1.

The common end of the first diode D1 and the second diode D2 serves as one end of the two-wire dimmer connected to one end of the input voltage Vin; the third diode D3 and the fourth diode D4 The common end of the two-wire dimmer is connected to one end of the output end load, and the output voltage of the two-wire dimmer is Vo; the two-wire dimmer and the output end load are connected in series and connected in parallel at the input voltage Vin.

The gate of the switch Q1 is connected to the first signal VI; the control end of the cut-off switch Q2 is connected to the second signal V2. The voltage on the auxiliary source capacitor C1 is the auxiliary source voltage Vcc.

It should be noted that the switching transistor Q1 constituting the chopper switch 10 shown in Fig. 13 is described by taking only a MOS transistor as an example. In practical applications, any one-way switch tube can be used as the illustrated switch tube Q1 to constitute the chopper switch of the embodiment of the present invention.

In the circuit shown in Figure 13, when the control switch Q1 is turned off and the cut-off switch Q2 is turned on, the two-wire dimmer obtains the auxiliary source voltage, that is, the auxiliary source capacitor is charged, and the output voltage of the dimmer, that is, the voltage across the load Vo is the difference between the input voltage Vin and the auxiliary source voltage Vcc; when the control switch Q1 is turned on and the cut-off switch Q2 is turned off, the auxiliary source capacitor C1 is discharged to the auxiliary source load (not shown), the dimmer The output voltage Vo is equal to the input voltage Vin; when the control switch Q1 is turned off and the cut-off switch Q2 is turned off, the auxiliary source capacitor C1 is discharged, and the output voltage Vo of the dimmer is zero.

For the auxiliary source circuit shown in FIG. 13, if the two-wire dimmer is alternately outputting a zero voltage and a non-zero voltage in a half cycle of the alternating voltage Vin, the output voltage of the two-wire dimmer is 斩Wave voltage. Specifically, when the chopper voltage control signal Vg of the circuit shown in Fig. 13 is the control signal of the trailing edge dimmer, the waveform of the output voltage Vo in the chopping period is as shown in Fig. 14.

In FIG. 14, the dotted line is the input voltage Vin of the two-wire dimmer, which is sinusoidal alternating current; when the auxiliary source capacitor is not charged, the output voltage Vo of the two-wire dimmer is in the chopping period. Is the chopping voltage.

Referring to FIG. 15, a circuit diagram of a second implementation mode of an auxiliary source circuit according to an embodiment of the present invention is shown. In the circuit shown in Fig. 15, the chopper switch 10 is composed of a unidirectional switch. The circuit shown in Fig. 15 further includes: a rectifying device D5 in series with the auxiliary source capacitor C1 and the cut-off switch Q2, as compared with the circuit shown in Fig. 13.

As shown in FIG. 15, the auxiliary source capacitor 20 is C1, the cut-off switch 30 is Q2, and the auxiliary source capacitor C1, the cut-off switch Q2, and the rectifying device D5 are connected in series to form a series branch; A series branch is coupled to the chopper switch 10 between the input voltage Vin and the output load. The series branch is specifically: one end of the auxiliary source capacitor C1 is connected to one end of the output end, the anode of the auxiliary source capacitor C1 is connected to one end of the disconnecting switch Q2; the other end of the disconnecting switch Q2 is connected The cathode of the rectifying device D5, the anode of the rectifying device D5 is connected to one end of the input voltage Vin.

The chopper switch 10 includes: a MOS transistor Q1; a source of the MOS transistor Q1 is connected to one end of the output terminal, and a drain of the MOS transistor Q1 is connected to an end of the series branch connected to the input voltage Vin. The two-wire dimmer and the load are connected in series and connected in parallel across the input voltage Vin.

The gate of the MOS transistor Q1 is connected to the first signal VI; the control terminal of the disconnecting switch Q2 is connected to the second signal V2. The voltage on the auxiliary source capacitor C1 is the auxiliary source voltage Vcc.

The circuit shown in Fig. 15 is similar to the circuit shown in Fig. 13, and will not be described again. Different from the circuit shown in FIG. 13, the circuit shown in FIG. 15 outputs a chopping voltage in one half cycle when the two-wire dimmer transmits the chopping voltage; and the body diode of the MOS transistor Q1 in the other half cycle. Turn on. That is, the chopping voltage outputted by the two-wire dimmer is in one AC cycle, one of which is a chopping voltage in one half cycle and an alternating current input voltage in the other half cycle. Specifically, when the chopper voltage control signal Vg of the circuit shown in Fig. 15 is the control signal of the trailing edge dimmer, the output voltage waveform of the circuit shown in Fig. 15 during the chopping period is as shown in Fig. 16.

It should be noted that the chopper switch 10 shown in Fig. 15 is described by taking only a MOS transistor as an example. In practical applications, the chopper switch of the embodiment of the present invention can be constructed by replacing the switch tube Q1 shown in Fig. 15 with a unidirectional switch tube anti-parallel diode. For example, the chopper switch 10 shown in FIG.

Referring to Figure 17, a circuit diagram of a third implementation of the auxiliary source circuit of the embodiment of the present invention. In the circuit shown in Fig. 17, the chopper switch 10 is composed of a unidirectional switch. Compared with the circuit shown in Fig. 15, in the circuit shown in Fig. 17, the diode D6 in the reverse parallel connection of the switch transistor Q1 is substituted for Q1 in Fig. 15.

As shown in FIG. 17, the auxiliary source capacitor 20 is C1, the cut-off switch 30 is Q2, and the auxiliary source capacitor C1, the cut-off switch Q2, and the rectifying device D5 are connected in series to form a series branch; A series branch is coupled to the chopper switch 10 between the input voltage Vin and the output load.

The series branch is specifically: one end of the auxiliary source capacitor C1 is connected to one end of the output end, the anode of the auxiliary source capacitor C1 is connected to one end of the disconnecting switch Q2; the other end of the disconnecting switch Q2 is connected The cathode of the rectifying device D5, the anode of the rectifying device D5 is connected to one end of the input voltage Vin.

The chopper switch 10 includes: a switch tube Q1 and a sixth diode D6; the emitter of the switch tube Q1 is connected to one end of the load of the output end, and the collector of the switch tube Q1 is connected to the input of the series branch One end of the voltage Vin.

The cathode of the sixth diode D6 is connected to the collector of the switching transistor Q1, and the anode of the sixth diode D6 is connected to the emitter of the switching transistor Q1.

The gate of the switch Q1 is connected to the first control signal VI; the control end of the cut-off switch Q2 is connected to the second control signal V2.

The voltage on the auxiliary source capacitor C1 is the auxiliary source voltage Vcc.

The circuit shown in Fig. 17 is similar to the circuit shown in Fig. 15, and will not be described again.

Referring to FIG. 18, a circuit diagram of a fourth implementation mode of the auxiliary source circuit of the embodiment of the present invention. In the circuit shown in Fig. 18, the chopper switch 10 is two MOS transistors.

As shown in FIG. 18, the auxiliary source capacitor 20 is C1, and the disconnecting switch 30 is Q2; the auxiliary source capacitor

Cl, the cut-off switch Q2, respectively connected in series with two diodes, forming two series branches; each of the series branches and Each of the switching switches 10 is connected in parallel.

The first series branch is specifically: the anode of the auxiliary source capacitor C1 is grounded, the anode of the auxiliary source capacitor C1 is connected to one end of the cut-off switch Q2, and the other end of the cut-off switch Q2 is connected to the seventh pole. The cathode of tube D7.

The second series branch is specifically: the anode of the auxiliary source capacitor C1 is grounded, the anode of the auxiliary source capacitor C1 is connected to one end of the cut-off switch Q2, and the other end of the cut-off switch Q2 is connected to the eighth pole The cathode of tube D8.

The chopper switch 10 includes: a third MOS transistor Q3 and a fourth MOS transistor Q4. The source of the third MOS transistor Q3 and the source of the fourth MOS transistor Q4 are grounded together.

The first series branch is connected in parallel with the third MOS transistor Q3 of the chopper switch 10, and the second series branch is connected in parallel with the fourth MOS transistor Q4 of the chopper switch 10.

Specifically, one end of the first series branch (ie, the anode of the seventh diode D7) is connected to the drain of the third MOS transistor Q3, and the other end of the first series branch (ie, the negative terminal of the auxiliary source capacitor C1) is connected. a source of the third MOS transistor Q3; one end of the second series branch (ie, the anode of the eighth diode D8) is connected to the drain of the fourth MOS transistor Q4, and the other end of the second series branch (ie, the auxiliary source capacitor C1) The negative electrode is connected to the source of the fourth MOS transistor Q4.

The drain of the third MOS transistor Q3 is connected to one end of the input voltage Vin; the drain of the fourth MOS transistor Q4 is connected to one end of the load of the output terminal, and the other end of the load of the output terminal is connected to the other end of the input voltage Vin.

The gate of the third MOS transistor Q3 and the gate of the fourth MOS transistor Q4 are connected to the first control signal VI; the control terminal of the disconnecting switch Q2 is connected to the second control signal V2.

In the circuit shown in FIG. 18, when the AC voltage Vin is in the positive half cycle, the third MOS transistor Q3 is controlled to be turned off, and when the cut-off switch Q2 is turned on, the two-wire dimmer obtains the auxiliary source voltage, that is, the auxiliary source capacitor. C1 charging, the output voltage of the dimmer, that is, the voltage Vo across the load is the difference between the input voltage Vin and the auxiliary source voltage Vcc; when the alternating voltage Vin is a negative half cycle, the fourth MOS transistor Q4 is controlled to be turned off, and the cutoff is controlled. When the switch Q2 is turned on, the two-wire dimmer obtains the auxiliary source voltage, that is, the auxiliary source capacitor C1 is charged, and the output voltage of the dimmer, that is, the voltage Vo across the load is the difference between the input voltage Vin and the auxiliary source voltage Vcc.

When the third MOS transistor Q3 and the fourth MOS transistor Q4 are controlled to be turned on, and the cut-off switch Q2 is turned off, the auxiliary source capacitor C1 is discharged to the auxiliary source load (not shown), and the output voltage of the dimmer is turned off. Vo is equal to the input voltage Vin; when the third MOS transistor Q3 and the fourth MOS transistor Q4 are turned off, and the cut-off switch Q2 is turned off, the auxiliary source capacitor C1 is discharged to the auxiliary source load, and the output voltage Vo of the dimmer is zero. .

Preferably, in the embodiment of the present invention, the chopping switch may be one or more; each chopping switch may be a one-way switch or a bidirectional switch.

Preferably, the series branch connected in parallel with the chopper switch may be one or more. The embodiment of the invention further provides an auxiliary source circuit of the two-wire dimmer. The difference from the circuit provided in the foregoing embodiment is that the circuit includes: a chopper switch, an auxiliary source capacitor, a cut-off switch, and a rectifying device. The rectifying device is connected in series with the auxiliary source capacitor to form a series branch; the disconnecting switch is connected in parallel with the series branch to form a parallel branch; and the chopping switch is further connected in series with the parallel branch. Specifically, it can be as shown in FIG.

19 is a structural diagram of an auxiliary source circuit of a two-wire dimmer according to a second embodiment of the present invention. The auxiliary power supply of the two-wire dimmer may include: a chopper switch 100, an auxiliary source capacitor 200, a cut-off switch 300, a rectifying device 400, and a control Device 500.

The rectifying device 400 is connected in series with the auxiliary source capacitor 200 to form a series branch; the disconnecting switch 300 is connected in parallel with the series branch to form a parallel branch; the chopper switch 100 is further connected to the parallel The branches are connected in series.

When the disconnecting switch 300 is turned off, the auxiliary source capacitor 200 is connected in series with the chopper switch 100, and the auxiliary source capacitor 200 is charged by the rectifying device 400; when the disconnecting switch 300 is turned on, the auxiliary device The source capacitor 200 stops charging.

The chopper switch 100 and the cut-off switch 300 are simultaneously connected in series with the output load and are connected in parallel across the input power supply Vin. The input signals of the control device 500 are Vg and Vb, and the first signal VI and the second signal V2 are output. The input signal Vg is a chopper voltage control signal of the dimmer, and the input signal Vb is a chopping period detection signal. The chopping period detection signal vb and the chopping voltage control signal vg are generated by a chopper control circuit (the circuit is not shown).

Wherein: the chopping voltage control signal Vg is a signal for controlling the output of the chopping voltage during the chopping period of the two-wire dimmer.

The chopping period detection signal Vb is a signal for detecting the chopping period of the chopper control circuit, and includes two states, state one and state two, that is, when the chopper control circuit controls the dimmer output voltage to be in the chopping period, the chopping The period detection signal Vb is in state one. When the chopper control circuit controls the dimmer output voltage to be in a non-chopping period, the chopping period detection signal Vb is in state two.

Wherein, the chopping period is: during the half cycle of inputting the alternating current power, the dimmer output voltage alternately exhibits zero voltage and non-zero voltage; the non-chopping period refers to: the dimmer output voltage There is no continuous zero voltage cycle.

The control device 500 is configured to detect an auxiliary source voltage, and according to the auxiliary source voltage Vcc and the input signal Vg and the chopping period detection signal Vb, output the first signal VI and the second signal V2 to respectively control the chopper switch 100 and The switch 300 is turned off or on.

When the auxiliary source capacitor is not charged, when the chopping voltage control signal Vg outputs a signal that causes the chopper switch 100 to be turned off, the control device 500 outputs the first signal VI to control the chopper switch 100 to be turned off, and output the second The signal V2 controls the cut-off switch 300 to be turned on, the two-wire dimmer outputs a zero voltage; when the chopping voltage control signal Vg outputs a signal that does not turn off the chopper switch 100, the control device 500 outputs the first signal VI control. The chopper switch 100 is turned on. When the voltage Vcc of the auxiliary source capacitor 200 is lower than the lower limit value, and the auxiliary source capacitor 200 needs to be charged, the control device 500 outputs the second signal V2 to control the cutoff switch 300 to be turned off, and the auxiliary source capacitor 200 passes. The rectifying device is connected in parallel across the disconnecting switch 300. Generally, the voltage Vcc of the auxiliary source capacitor 200 is very low, only about several V, and the two-wire dimmer outputs a non-zero voltage; the voltage Vcc of the auxiliary source capacitor 200 is higher than the upper limit value, When the auxiliary source capacitor 200 does not need to be charged, the control device 500 outputs a second signal V2 to control the cut-off switch 300 to be turned on, and the two-wire dimmer outputs a non-zero voltage.

An auxiliary source circuit corresponding to the two-wire dimmer of the second embodiment of the present invention provides an auxiliary power supply control method for a two-wire dimmer.

20 is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 10 of the present invention. The method specifically includes the following steps:

Step S1001: start;

Step S1002: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S1003; if not, returning to step S1002; Step S1003: determining whether the chopper switch 100 is in the chopping cycle, if yes, proceeding to step S1004; if not, proceeding to step S1005;

Step S1004: The auxiliary source capacitor 200 is not charged, and returns to step S1001;

Step S1005: The auxiliary source capacitor 200 is charged, and the process returns to step S1001.

It should be noted that, in the tenth embodiment shown in FIG. 20, the execution order of step S1002 and step S1003 is not limited, that is, the embodiment shown in FIG. 20 may also be shown in FIG. 20(a).

Referring to FIG. 20(a), a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 10(a) of the present invention is shown. The method specifically includes the following steps:

Step S1001-a: start;

Step S1002-a: determining whether the chopper switch 100 is in the chopping period, if yes, returning to step S1001-a; if not, proceeding to step S1003-a;

Step S1003-a: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S1005-a; if not, proceeding to step S1004-a;

Step S1004-a: The auxiliary source capacitor 200 is not charged, and returns to step S1001-a;

Step S1005-a: The auxiliary source capacitor 200 is charged, and the process returns to step S1001-a.

20(a) is different from FIG. 20 in that steps S1002 and S1003 are performed in different order, but the logical relationship is the same. Specifically, the case required to obtain step S1004 or obtain step S1005 is shown in FIG. 20 and FIG. 20(a). All the same.

In the embodiment of the present invention, the auxiliary source circuit shown in FIG. 19: the auxiliary source capacitor 20 in the step S1004 and the step S1004-a is not charged, and may be specifically: turning on the disconnecting switch 300; step S1005 and step S1005- The charging of the auxiliary source capacitor 20 in a may be specifically: turning off the disconnecting switch 300.

The embodiment of Fig. 20 can be specifically shown in Fig. 21.

It should be noted that both Fig. 20 and Fig. 20(a) can implement the present invention, and the logical relationship is the same. Therefore, in the following sixth embodiment, seventh embodiment, eighth embodiment, and ninth embodiment and description, FIG. 20 is taken as an example, but the following embodiments are not limited to FIG. 20, and FIG. 20(a) also has Corresponding embodiments.

21 is a flow chart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 11 of the present invention. The method specifically includes the following steps:

Step S1101: start;

Step S1102: Detect the current auxiliary source voltage, determine whether the auxiliary source voltage is lower than the set lower limit value, and if yes, proceed to step S1103; if no, return to step S1101;

Step S1103: determining whether the chopper switch 10 is in the chopping period, if yes, proceeding to step S1104; if not, proceeding to step S1105;

Step S1104: Turn on the disconnecting switch 300, and return to step S1101;

Step S1105: Turning off the disconnecting switch 300, the process returns to step S1101.

According to the method of the eleventh embodiment of the present invention, when the disconnecting switch 300 is turned off, the auxiliary source capacitor 200 is connected in series with the chopper switch 100, and the auxiliary source capacitor 200 is charged by the rectifying device 400; When the cut-off switch 300 is turned on, the auxiliary source capacitor 200 stops charging.

Referring to FIG. 22, a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 12 of the present invention is shown. The method specifically includes the following steps: Step S1201: start;

Step S1202: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S1203; if not, proceeding to step S1204;

Step S1203: Turn on the disconnecting switch 30, and return to step S1201;

Step S1204: Detect the current auxiliary source voltage, determine whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceed to step S1205; if no, return to step S1201;

Step S1205: determining whether the chopper switch 100 is in the chopping cycle, if yes, proceeding to step S1206; if not, proceeding to step S1207;

Step S1206: Turn on the disconnecting switch 300, and return to step S1204;

Step S1207: The cut-off switch 300 is turned off, and the flow returns to step S1204.

According to the method of the twelfth embodiment of the present invention, the auxiliary source voltage is detected, and when the auxiliary source voltage is lower than the set lower limit value and the chopper switch 100 is in the non-chopping period, the cut-off switch 300 is controlled to be turned off. In this case, in the two-wire dimmer, the auxiliary source capacitor 200 and the disconnecting switch 300 are connected in parallel to form a parallel branch, and the parallel branch is connected in series with the chopper switch 100, and is connected to the two-wire dimmer. The output load forms a loop. At this time, the AC power source charges the auxiliary source capacitor 200 through the loop to raise the auxiliary source voltage, and the output voltage of the two-wire dimmer is the difference between the input AC voltage and the auxiliary source voltage.

The cut-off switch 300 is controlled to be turned on if the auxiliary source voltage is lower than the set lower limit value and the chopper switch 100 is in the chopping period. At this time, the conduction of the disconnecting switch 300 short-circuits the series branch formed by the auxiliary source capacitor 200 and the rectifying device, and the auxiliary source capacitor 200 releases energy to the auxiliary source load (not shown). The output voltage Vo of the two-wire dimmer is zero.

When the auxiliary source voltage is higher than the set upper limit value, the cut-off switch 300 is controlled to be turned on. At this time, if the chopper switch 100 alternately turns on and off during a half cycle of the AC power source, the two-wire dimmer outputs a chopping voltage; if the chopper switch 100 is always turned on during the AC power cycle, then two The output voltage of the line dimmer is the input AC voltage.

Preferably, the chopping switches may be one or more; each chopping switch may be a one-way switch or a bidirectional switch. Preferably, a voltage stabilizing module or a boosting module may be disposed at an output of the auxiliary source capacitor. The voltage stabilizing module may include a voltage stabilizing device, or a voltage stabilizing circuit composed of a voltage stabilizing device, or a linear voltage stabilizing circuit, etc.; the boosting module may be a boost converter circuit or the like, and may be, for example, a BOOST circuit.

It should be noted that, in practical applications, the set lower limit value of the auxiliary source voltage may be set higher than the voltage value when the auxiliary source circuit can operate normally. This can ensure that: when the auxiliary source voltage is lower than the set lower limit value and is in the period of the two-wire dimmer chopping period, that is, the auxiliary source capacitor can only be discharged to the auxiliary source load and cannot be charged. The minimum value of the auxiliary source voltage is still guaranteed to maintain the normal operation of the auxiliary source circuit.

Since the voltage of the auxiliary source capacitor is equal to the voltage across the cut-off switch during charging, the voltage across the cut-off switch does not exceed the set upper limit value of the auxiliary source voltage, that is, when the two-wire dimmer outputs a non-zero voltage, The difference between the output voltage and the input AC voltage does not exceed the set upper limit of the auxiliary source voltage.

At the same time, since the chopper switch operates in the switching state and in the non-linear state, the auxiliary source circuit loss of the embodiment of the present invention is small and the efficiency is high.

Referring to FIG. 23, it is a flowchart of a method for controlling an auxiliary source circuit of a two-wire dimmer according to Embodiment 13 of the present invention. Implementation The method of the thirteenth embodiment differs from the twelfth embodiment in that: before determining whether the auxiliary source voltage is higher than a set upper limit value, it is first determined whether the auxiliary source voltage is higher than a set fault voltage value.

Specifically, the method described in Embodiment 13 may include the following steps:

Step S1301: start;

Step S1302: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set fault voltage value, if yes, proceeding to step S1303; if not, proceeding to step S1305;

Step S1303: output a fault control signal, turning on the cut-off switch 300;

Step S1304: determining whether the auxiliary source voltage is lower than the set fault voltage value, if yes, proceeding to step S1305; if not, returning to step S1303;

Step S1305: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is higher than the set upper limit value, if yes, proceeding to step S1306; if not, proceeding to step S1307;

Step S1306: Turn on the cut-off switch 300, and return to step S1305;

Step S1307: detecting the current auxiliary source voltage, determining whether the auxiliary source voltage is lower than the set lower limit value, if yes, proceeding to step S1308; if not, returning to step S1302;

Step S1308: determining whether the chopper switch 100 is in the chopping cycle, if yes, proceeding to step S1309; if not, proceeding to step S1310;

Step S1309: Turn on the cut-off switch 300, and return to step S1307;

Step S1310: Turning off the disconnecting switch 300, the process returns to step S1307.

In the method of the thirteenth embodiment of the present invention, when detecting that the auxiliary source voltage is higher than the set fault voltage value, turning on the cut-off switch 300, and then detecting whether the auxiliary source voltage is lower than the set fault voltage If the auxiliary source voltage is lower than the set fault voltage value after the switch 300 is turned on, the fault control signal is not outputted directly to the normal operation mode; if the cutoff switch 300 is turned on, the auxiliary source voltage is still Above the set fault voltage value, the fault control signal is continuously output and the cut-off switch is controlled to be turned on. This makes it possible to protect the auxiliary source circuit in the event of an abnormality or malfunction in the auxiliary source circuit.

Compared with the embodiment 12 (that is, the embodiment shown in FIG. 22), this embodiment adds on the basis of the embodiment 12: before entering the normal working mode, first determining whether the auxiliary source voltage is higher than The step of setting the fault voltage value. If it is higher than the set fault voltage value, a fault control signal is output, and the fault signal controls the auxiliary source capacitor to be uncharged, and only when the auxiliary source voltage is lower than the set fault voltage value, normal operation is started, thereby achieving Protection of the auxiliary source circuit.

It should be noted that, in the eleventh to thirteenth embodiments of the present invention, the step of determining whether the chopper switch is in the chopping period and the step of determining whether the auxiliary source voltage is lower than the set lower limit value are also performed. Alternatively, in the eleventh to thirteenth embodiments, whether the chopper switch is in the chopping period or not, and then determining whether the auxiliary source voltage is lower than the set lower limit, The execution process is similar to that of Embodiment 10(a) and will not be described here.

As shown in FIG. 19, the auxiliary source circuit structure diagram of the two-wire dimmer of the second embodiment of the present invention, the rectifying device 400 is connected in series with the auxiliary source capacitor 200 to form a series branch; the disconnecting switch 300 and The series branches are connected in parallel to form a parallel branch; the chopper switch 100 is further connected in series with the parallel branch.

In the method of the tenth to thirteenth embodiments of the present invention, when the disconnecting switch 300 is turned off, the auxiliary source capacitor 200 is connected in series with the chopper switch 100, and the auxiliary source capacitor 200 is charged by the rectifying device 400. When the cut-off switch 300 is turned on, the auxiliary source capacitor 200 stops charging. When the chopper switch 100 is turned off, the two-wire dimmer output voltage Vo is zero voltage regardless of whether the auxiliary source capacitance is charged or not; when the chopper switch 100 is turned on, regardless of whether the auxiliary source capacitor is charged, The two-wire dimmer output voltage Vo is a non-zero voltage. This is because when the first signal VI controls the chopper switch 100 to be turned on, and the second signal V2 controls the disconnect switch 300 to be turned on, the AC input voltage Vin passes through the chopper switch 100 and the cut-off switch 300. Forming a loop with the output load, the output load voltage, that is, the dimmer output voltage Vo is equal to the input AC voltage Vin, which is a non-zero voltage; when the first signal VI controls the chopper switch 100 to be turned on, and the second signal V2 is controlled When the disconnecting switch 300 is turned off, the AC input voltage Vin forms a loop through the chopper switch 100, the auxiliary source capacitor 200, the rectifying device 400, and the output terminal load, and the output terminal load voltage, that is, the dimmer output voltage Vo is equal to The difference between the input AC voltage Vin and the auxiliary source voltage Vcc is generally low, and the voltage Vcc of the auxiliary source capacitor 200 is low, only a few volts. Therefore, the dimmer output voltage Vo is also a non-zero voltage.

The control device 500 is configured to detect an auxiliary source voltage Vcc, output a first signal VI for controlling the on/off of the chopper switch 100 according to the auxiliary source voltage and the chopping period detection signal Vb, and control the cutting off The switch 300 turns on the second signal V2.

Specifically, the auxiliary source voltage is detected. If the auxiliary source voltage is lower than the set lower limit value, and the chopper switch of the two-wire dimmer is in the non-chopping period, the control device 500 detects the signal Vb according to the chopping period. The second signal V2 is output to control the cut-off switch 300 to be turned off. At this time, in the two-wire dimmer, the auxiliary source capacitor 200 is connected in series with the chopper switch 100, and forms a loop with the output of the two-wire dimmer, and the AC power source charges the auxiliary source capacitor 200 through the loop, and the auxiliary source voltage Vcc Raised, the output voltage of the two-wire dimmer is the difference between the input AC voltage and the auxiliary source voltage.

When the auxiliary source voltage is lower than the set lower limit value and the chopper switch is in the chopping period, the control device 500 controls the disconnecting switch 300 to be turned on according to the chopping period detecting signal Vb. At this time, in the two-wire dimmer, the AC power source stops charging the auxiliary source capacitor 200, and the auxiliary source capacitor 200 releases energy to the auxiliary source load.

When the auxiliary source voltage is higher than the set upper limit value, the control device 500 controls the cut-off switch 300 to be turned on according to the chopping period detection signal Vb.

When the chopper switch of the two-wire dimmer is in the chopping cycle, the control device 500 outputs the first signal VI according to the chopping voltage control signal Vg, and controls the chopper switch 100. On and off, the dimmer output voltage Vo is chopped.

The specific implementation form of the auxiliary source circuit of the two-wire dimmer of the second embodiment of the present invention is described in detail below. Referring to FIG. 24, a circuit diagram of a fifth implementation manner of an auxiliary source circuit according to an embodiment of the present invention is shown. In the circuit shown in Fig. 24, the chopper switch 100 is composed of a rectifier bridge and a unidirectional switch.

As shown in FIG. 24, the auxiliary source capacitor 200 is C1, the disconnecting switch 300 is Q2, and the rectifying device is

D11; the auxiliary source capacitor C1 is connected in series with the rectifying device D11 to form a series branch, and the series branch is further connected in parallel with the disconnecting switch Q2 to form a parallel branch; the chopper switch 100 and the parallel branch In series.

The parallel branch is specifically: the anode of the auxiliary source capacitor C1 is connected to the common reference terminal (ground), the anode of the auxiliary source capacitor C1 is connected to the cathode of the rectifying device D11, and the two ends of the disconnecting switch Q2 are respectively The anode of the auxiliary source capacitor C1 and the anode of the rectifying device D11 are connected.

The chopper switch 100 is a bidirectional switch composed of a switch tube Q5 and a rectifier bridge. The rectifier bridge is composed of a twelfth diode D12, a thirteenth diode D13, and a fourteenth diode D14. The fifteenth diode D15 is composed.

The twelfth diode D12 and the thirteenth diode D13 are connected in series, and the cathode of the twelfth diode D12 is connected. The anode of the thirteenth diode D13.

The fourteenth diode D14 and the fifteenth diode D15 are connected in series, and the cathode of the fourteenth diode D14 is connected to the anode of the fifteenth diode D15.

The anode of the twelfth diode D12 and the anode of the fourteenth diode D14 are connected to the source of the switching transistor Q5; the cathode of the thirteenth diode D13 and the fifteenth two The cathode of the pole tube D15 is connected to the common end of the anode of the rectifying device D11 and the disconnecting switch Q2.

The switching transistor Q5 is exemplified by a MOS transistor. The drain of the switching transistor Q5 is connected to the common terminal of the disconnecting switch Q2 and the negative terminal of the auxiliary source capacitor C1.

The common end of the twelfth diode D12 and the thirteenth diode D13 is connected to the input voltage Vin as one end of the two-wire dimmer; the fourteenth diode D14 and the fifteenth diode The common end of the tube D15 is connected to the output end of the two-wire dimmer, and the output voltage of the two-wire dimmer is Vo.

The two-wire dimmer and the load are connected in series and connected in parallel across the input Vin.

The gate of the switch Q5 is connected to the first signal VI; the control end of the cut-off switch Q2 is connected to the second signal V2. The voltage on the auxiliary source capacitor C1 is the auxiliary source voltage Vcc.

It should be noted that the switching transistor Q5 constituting the chopper switch 100 shown in Fig. 24 will be described by taking only a MOS transistor as an example. In practical applications, any one-way switch tube can be used as the illustrated switch tube Q1 to constitute the chopper switch of the embodiment of the present invention.

In the circuit shown in FIG. 24, when the control switch Q5 is turned on and the cut-off switch Q2 is turned off, the two-wire dimmer obtains the auxiliary source voltage, and the output voltage Vo is the difference between the input voltage Vin and the auxiliary source voltage Vcc; When the tube Q5 is turned on and the cut-off switch Q2 is turned on, the auxiliary source capacitor C1 is discharged, and its output voltage is equal to the input voltage Vin; when the control switch tube Q5 is turned off and the cut-off switch Q2 is turned on, the auxiliary source capacitor C1 is turned to The auxiliary source load (not shown) is discharged and its output voltage is zero.

For the auxiliary source circuit shown in FIG. 24, if the two-wire dimmer alternately outputs a zero voltage and a non-zero voltage in a half cycle of the alternating voltage Vin, the output voltage of the two-wire dimmer is a chopping voltage. . Specifically, when the chopper voltage control signal Vg of the circuit shown in Fig. 24 is the trailing edge dimmer control signal, the waveform of the output voltage Vo during the chopping period can be as shown in Fig. 25.

26 is a circuit diagram of a sixth implementation manner of an auxiliary source circuit according to an embodiment of the present invention. In the circuit shown in Fig. 26, the chopper switch 100 is composed of a unidirectional switch.

As shown in FIG. 26, the auxiliary source capacitor 200 is C1, the cut-off switch 300 is Q2, the rectifying device is D11, and the auxiliary source capacitor C1 is connected in series with the rectifying device D11 to form a series branch. The branch circuit is further connected in parallel with the cut-off switch Q2 to form a parallel branch; the chopper switch 100 is connected in series with the parallel branch.

The parallel branch is specifically: the anode of the auxiliary source capacitor C1 is connected to the output end of the output terminal, the anode of the auxiliary source capacitor C1 is connected to the cathode of the rectifying device D11, and the two ends of the disconnecting switch Q2 are respectively connected The anode of the auxiliary source capacitor C1 and the anode of the rectifying device D11 are described.

The chopper switch 100 includes: a switch tube Q5; a source of the switch tube Q5 is connected to a common end of the cut-off switch Q2 and an anode of the rectifying device D11; a drain of the switch tube Q5 is connected to the input One end of the voltage Vin.

The other end of the input voltage Vin is connected to the other end of the output load.

The gate of the switch Q5 is connected to the first signal VI; the control end of the cut-off switch Q2 is connected to the second signal V2. The voltage on the auxiliary source capacitor CI is the auxiliary source voltage Vcc.

The circuit shown in Fig. 26 is similar to the circuit shown in Fig. 24 and will not be described again. Different from the circuit shown in Fig. 24, the circuit shown in Fig. 26 outputs a chopping voltage in one half cycle when the two-wire dimmer transmits the chopping voltage; and the body diode of the switching transistor Q5 in the other half cycle. Turn on. That is, the chopping voltage outputted by the two-wire dimmer is in one AC cycle, one of which is a chopping voltage in one half cycle and an alternating current input voltage in the other half cycle. Specifically, when the chopper voltage control signal Vg of the circuit shown in Fig. 26 is the trailing edge dimmer control signal, the output voltage Vo waveform in the chopping period is as shown in Fig. 27.

It should be noted that the switching transistor Q5 constituting the chopper switch 100 shown in Fig. 26 will be described by taking only a MOS transistor as an example. In practical applications, the chopper switch of the embodiment of the present invention can be constructed by replacing the switch tube Q5 shown in Fig. 26 with a unidirectional switch tube anti-parallel diode. For example, the chopper switch 100 shown in Fig. 28.

28 is a circuit diagram of a seventh implementation manner of an auxiliary source circuit according to an embodiment of the present invention. In the circuit shown in Fig. 28, the chopper switch 100 is composed of a unidirectional switch. Compared with the circuit shown in Fig. 26, in the circuit shown in Fig. 28, the diode D16 is connected in reverse by the switching transistor Q5 in place of Q5 in Fig. 26.

As shown in FIG. 28, the structure of the parallel branch is the same as that of FIG. 26, and details are not described herein again.

The chopper switch 100 includes: a switch tube Q5 and a sixteenth diode D16; the emitter of the switch tube Q5 is connected to the common end of the cut-off switch Q2 and the anode of the rectifying device D11, the switch tube The collector of Q5 is connected to the input voltage Vin.

The cathode of the sixteenth diode D16 is connected to the collector of the switching transistor Q5, and the anode of the sixteenth diode D16 is connected to the emitter of the switching transistor Q5.

The circuit shown in Fig. 28 is similar to the circuit shown in Fig. 26 and will not be described again.

Referring to FIG. 29, a circuit diagram of an eighth implementation manner of an auxiliary source circuit according to an embodiment of the present invention is shown. In the circuit shown in Fig. 29, the chopper switch 100 includes two MOS transistors.

As shown in FIG. 29, the auxiliary source capacitor 200 is C1, the disconnecting switch 300 includes a sixth switching transistor Q6 and a seventh switching transistor Q7, and the rectifying device includes a seventeenth diode D17 and an eighteenth two Tube D18.

The parallel branch formed by the auxiliary source capacitor, the rectifying device, and the cut-off switch is specifically: the anode of the auxiliary source capacitor C1 is grounded, and the anode of the auxiliary source capacitor C1 is respectively connected to the cathode of the seventeenth diode D17 and a cathode of the eighth diode D18; two ends of the sixth switch tube Q6 are respectively connected to the anode of the auxiliary source capacitor C1 and the anode of the seventeenth diode D17; the two ends of the seventh switch tube Q7 The anode of the auxiliary source capacitor C1 and the anode of the eighteenth diode D18 are respectively connected.

The chopper switch 100 includes an eighth MOS transistor Q8 and a ninth MOS transistor Q9.

The source of the eighth MOS transistor Q8 is connected to the common end of the anode of the sixth switch transistor Q6 and the seventeenth diode D17, and the drain of the eighth MOS transistor Q8 is connected to one end of the input voltage Vin. .

The source of the ninth MOS transistor Q9 is connected to the common terminal of the anode of the seventh switch transistor Q7 and the eighteenth diode D18, and the drain of the ninth MOS transistor Q9 is connected to the output end of the output terminal.

The gate of the eighth MOS transistor Q8 and the gate of the ninth MOS transistor Q9 are connected to the first control signal VI; The control terminal of the switching transistor Q6 and the control terminal of the seventh switching transistor Q7 are connected to the second control signal V2.

The circuit shown in FIG. 29 detects the auxiliary source voltage Vcc, and controls the sixth switching transistor Q6 and the seventh switching transistor if the auxiliary source voltage Vcc is lower than the set lower limit value and the chopping period detection signal Vb is a non-chopping period. Q7 is turned off. At this time, in the two-wire dimmer, the auxiliary source capacitor C1 passes through the seventeenth diode D17 (or the eighteenth diode D18) and the sixth switching tube Q6 (or the seventh switching tube Q7), and Eight MOS tube Q8 and ninth MOS tube Q9 are connected in series, and form a loop with the output of the two-wire dimmer, and the AC power source charges the auxiliary source capacitor C1 through the loop, and the auxiliary source voltage Vcc rises, the two-wire dimmer The output voltage is the difference between the input voltage Vin and the auxiliary source voltage Vcc.

When the auxiliary source voltage Vcc is lower than the set lower limit value and the chopping period detection signal Vb is the chopping period, the sixth switching transistor Q6 and the seventh switching transistor Q7 are controlled to be turned on. At this time, the conduction of the sixth switching transistor Q6 (or the seventh switching transistor Q7) short-circuits the series branch of the auxiliary source capacitor C1 and the seventeenth diode D17 (or the eighteenth diode D18), the auxiliary source Capacitor C1 releases energy to the auxiliary source load (not shown in the auxiliary source load diagram); the two-wire dimmer output voltage is zero.

When the auxiliary source voltage Vcc is higher than the set upper limit value, the sixth switching transistor Q6 and the seventh switching transistor Q7 are controlled to be turned on; at this time, if the eighth MOS transistor Q8 and the ninth MOS transistor Q9 are in the half of the alternating current power supply When the cycle is alternately turned on and off, the two-wire dimmer outputs a chopping voltage. If the eighth MOS transistor Q8 and the ninth MOS transistor Q9 are always turned on during the AC power supply cycle, the output voltage of the two-wire dimmer is the input AC. Voltage.

The method for controlling the auxiliary source circuit of the two-wire dimmer provided by the present invention is described in detail. The principle and implementation of the present invention are described in the following. The description of the above embodiment is only The method and its core idea for helping to understand the present invention; at the same time, there will be changes in the specific embodiments and application scopes according to the idea of the present invention. In summary, the content of the specification should not be construed as limiting the invention.

Claims

Rights request

A control method for an auxiliary source circuit of a two-wire dimmer, characterized in that: the auxiliary source circuit comprises: an auxiliary source capacitor and a cut-off switch constituting a series branch; and a chopping parallel to the series branch Switch

The method includes the following steps:

Step 1: start;

2. The method according to claim 1, wherein after the step 1 and before the step 2, the method further comprises:

3. The method according to claim 2, wherein after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn off the cut-off switch;

The method according to claim 1, wherein after the step 1 and before the step 2, the method further comprises:

5. The method according to claim 4, wherein after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn off the cut-off switch;

6. A method of controlling an auxiliary source circuit of a two-wire dimmer, characterized in that: the auxiliary source circuit comprises: an auxiliary source capacitor and a cut-off switch constituting a series branch; and a chopping parallel to the series branch Switch

The method includes the following steps:

Step 1: start;

Step 2: Determine whether the chopping switch is in the chopping period, and if yes, return to step 1; if no, enter Step 3;

The method according to claim 6, wherein after the step 1 and before the step 2, the method further comprises:

8. The method according to claim 7, wherein after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn off the cut-off switch;

10. The method according to claim 9, wherein after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn off the cut-off switch;

11. A method of controlling an auxiliary source circuit of a two-wire dimmer, wherein: the auxiliary source circuit comprises: a rectifying device and an auxiliary source capacitor connected in series to form a series branch; a disconnecting switch and the series branch Parallel to form a parallel branch; the chopper switch is in series with the parallel branch;

The method includes the following steps:

Step 1: start;

The method according to claim 11, wherein after the step 1 and before the step 2, the method further comprises: Step 11: Detect the current auxiliary source voltage, determine whether the auxiliary source voltage is higher than the set upper limit value, and if yes, turn on the cut-off switch, return to step 11; if no, go to step 2.

13. The method according to claim 12, wherein after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn on the cut-off switch;

14. A method of controlling an auxiliary source circuit of a two-wire dimmer, wherein: the auxiliary source circuit comprises: a rectifying device and an auxiliary source capacitor connected in series to form a series branch; a disconnecting switch and the series branch Parallel to form a parallel branch; the chopper switch is in series with the parallel branch;

The method includes the following steps:

Step 1: start;

The method according to claim 14, wherein after the step 1 and before the step 2, the method further comprises:

The method according to claim 15, wherein after step 1, before entering step 11, further comprising:

Step 22: output a fault control signal, and turn on the cut-off switch;