WO2012113201A1 - 一种辅助源电路 - Google Patents
一种辅助源电路 Download PDFInfo
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- WO2012113201A1 WO2012113201A1 PCT/CN2011/077547 CN2011077547W WO2012113201A1 WO 2012113201 A1 WO2012113201 A1 WO 2012113201A1 CN 2011077547 W CN2011077547 W CN 2011077547W WO 2012113201 A1 WO2012113201 A1 WO 2012113201A1
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- capacitor
- switch tube
- switch
- diode
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
Definitions
- the present invention relates to the field of auxiliary source circuits, and more particularly to an auxiliary source circuit for a two-wire dimmer. Background technique
- the existing two-wire dimmer is usually connected between the power supply (Hot) and the load terminal (Dimmed Hot). Since the dimmer has only two wirings to the grid and load terminals, it is named as a two-wire dimmer. Small represents the size of the dimming signal.
- two-wire dimmers are required to have various adjustment modes such as color and/or brightness.
- two-wire dimmers have more lines inside, and even digital control methods such as single-chip microcomputers are needed.
- An auxiliary power supply for the microcontroller or other line is generated inside the two-wire dimmer.
- the auxiliary source in the circuit is when the chopper switch (110, 112) is cut off, the voltage drop is reduced when the chopper switch is turned off.
- Capacitor C1 is charged.
- a charging circuit is formed by the diode D1, the capacitor C1, the body diode of the field effect transistor (FET) 110, and the load; in the negative half cycle of the sine wave, the body of the diode D2, the capacitor C1, and the FET 112
- the diode and the load form a charging loop, and then the auxiliary source (124) is regulated to obtain the auxiliary power source Vcc.
- a minimum chopping angle is required to obtain the minimum auxiliary source voltage, that is, the chopper switch is required to be in the half AC cycle for a period of time. Turn on. However, even if the chopper switch has a short time (small chopping angle) and does not conduct, it will cause large electromagnetic interference due to sudden changes in voltage and current. Summary of the invention In view of the above, it is an object of the present invention to provide an auxiliary source circuit that eliminates electromagnetic interference problems in the process of acquiring an auxiliary power source.
- the present invention provides the following technical solutions:
- An auxiliary source circuit comprising: a chopper switch, a clamp circuit and a capacitor;
- a high potential end of the clamp circuit is connected to a second end of the switch tube in the chopper switch, and a low potential end is grounded;
- One end of the capacitor is connected to the low potential end of the clamp circuit, and the other end is connected to the second end of the switch tube in the chopper switch;
- the clamp circuit When the chopper switch is turned on, the clamp circuit charges the capacitor, and when the chopper switch is turned off, the capacitor is not charged;
- the voltage across the capacitor is the output voltage of the auxiliary source circuit.
- the chopper switch comprises: a rectifier bridge and a switch tube; a first end of the switch tube is connected to a positive output end of the rectifier bridge, and a negative output end of the rectifier bridge Connected to the low potential end of the clamp circuit, one input end of the rectifier bridge is connected to one end of the alternating current power source, and the other input end of the rectifier bridge is connected to the load end.
- the chopper switch comprises a switch tube
- the first end of the switch tube is connected to the alternating current power source
- the capacitor is connected to the second end of the switch tube through a fifth diode, the anode of the fifth diode is connected to the second end of the switch tube, and the cathode of the fifth diode is One end of the capacitor is connected;
- the low potential end of the clamp circuit is connected to the load end.
- the clamping circuit comprises: a resistor and at least one voltage regulator;
- the resistor is connected in parallel to both ends of the voltage stabilizing tube; when the clamping circuit includes a plurality of voltage stabilizing tubes, the plurality of voltage stabilizing tubes are sequentially end to end The connections form a branch, and the resistors are connected in parallel to both ends of the branch.
- the clamp circuit includes: at least one diode; when the clamp circuit includes a diode, an anode of the diode is a high potential end of the clamp circuit, a cathode of the diode is a low potential end of the clamp circuit;
- the clamping circuit includes a plurality of diodes
- the plurality of diodes are connected end to end to form a branch
- the anode end of the branch is the high potential end of the clamp circuit
- the cathode end of the branch is the low potential end of the clamp circuit.
- An auxiliary source circuit comprising: a chopper switch, a charge-off circuit and a first capacitor; a first end of the switch tube in the chopper switch is connected to a first output end of the charge-off circuit; One end of a capacitor is connected to the second end of the switch tube, and the other end is connected to the second output end of the charge-off circuit;
- the control terminal of the charge-off circuit is connected to the second control signal.
- the control chopper switch When the chopper switch is turned on, the control chopper switch operates in a linear state, and the charge-off circuit is controlled to be in a low-impedance state. Charging the first capacitor, when the chopper switch is turned off, controlling the charge-off circuit to be in a high-impedance state, and the first capacitor is not charged;
- the voltage on the first capacitor is a first output voltage of the auxiliary source circuit.
- the chopper switch comprises: a rectifier bridge and a switch tube; a first end of the switch tube is connected to a positive output end of the rectifier bridge, and a second end of the switch tube Connected to the negative output end of the rectifier bridge, one input end of the rectifier bridge is connected to one end of the alternating current power source, and the other input end of the rectifier bridge is connected to the load end.
- the chopper switch comprises a switch tube
- the first end of the switch tube is connected to an alternating current power source, and the second end is connected to the load end;
- a first end of the switch tube is connected to a first output end of the charge-off circuit through a sixth diode, and an anode of the sixth diode is connected to a first end of the switch tube, A cathode of the sixth diode is coupled to the first output of the charge shutdown circuit.
- the chopper switch comprises a first switch tube and a second switch tube;
- the first end of the first switch tube is connected to the first output end of the charge-off circuit through a seventh diode, and the first end of the first switch tube is connected to one end of the AC power source;
- the first end of the second switch tube is connected to the first output end of the charge-off circuit through an eighth diode, and the first end of the second switch tube is connected to the load end;
- the anode of the seventh diode is connected to the first end of the first switch tube, and the anode of the eighth diode is connected to the first end of the second switch tube;
- the second end of the first switch tube is connected to the second end of the second switch tube and is connected to the other end of the capacitor.
- the auxiliary source circuit further comprising a Boost boost converter and a second capacitor; two input ends of the Boost converter are connected to both ends of the first capacitor;
- the second capacitor is connected between two outputs of the Boost boost converter
- the voltage on the second capacitor is the second output voltage of the auxiliary source circuit.
- the auxiliary source circuit further includes an auxiliary control circuit, wherein the auxiliary control circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, an NPN transistor, and a PNP transistor;
- the first resistor and the second resistor are connected in series and then connected in parallel to both ends of the first capacitor, or the first resistor and the second resistor are connected in series and then connected in parallel to both ends of the second capacitor;
- a base of the NPN transistor is connected to a common end of the first resistor and the second resistor, an emitter is grounded, and a collector is connected to a base of the PNP transistor through the third resistor;
- the emitter of the PNP transistor is connected to the ungrounded end of the second capacitor, and the collector is connected to the control end of the switch tube in the chopper switch through the fourth resistor.
- the charge-off circuit includes: a fifth switch tube; the first end of the fifth switch tube is a first output end of the charge-off circuit, and the fifth switch tube The second end of the charge-off circuit is a second output end, and the control end of the fifth switch tube is an input end of the charge-off circuit.
- the auxiliary power source is obtained when the chopper switch is turned on, and the minimum chopping angle is not required, thereby eliminating the electromagnetic interference problem.
- Figure 1 shows the existing auxiliary source circuit
- FIG. 2 is a circuit diagram of an auxiliary source circuit disclosed in the present invention.
- FIG. 3 is a circuit diagram of an auxiliary source circuit according to Embodiment 1 of the present invention.
- FIG. 4 is a circuit diagram of an auxiliary source circuit according to Embodiment 2 of the present invention.
- FIG. 5 is a circuit diagram of an auxiliary source circuit according to Embodiment 3 of the present invention.
- 6 is a circuit diagram of another auxiliary source circuit disclosed in the present invention.
- FIG. 7 is a circuit diagram of an auxiliary source circuit according to Embodiment 4 of the present invention.
- Embodiment 8 is a circuit diagram of an auxiliary source circuit disclosed in Embodiment 5 of the present invention.
- FIG. 9 is a circuit diagram of an auxiliary source circuit according to Embodiment 6 of the present invention.
- FIG. 10 is a circuit diagram of an auxiliary source circuit disclosed in Embodiment 7 of the present invention.
- FIG. 11 is a circuit diagram of an auxiliary source circuit disclosed in Embodiment 8 of the present invention. detailed description
- MOS tube insulated gate field effect transistor
- IGBT Insulated Gate Bipolar Transistor, insulated gate bipolar transistor
- Boost converter Boost converter.
- FIG. 2 is a circuit diagram of an auxiliary source circuit disclosed in the present invention.
- the auxiliary source circuit includes: a chopper switch 21, a clamp circuit 22, and a capacitor Cl.
- the chopper switch 21 includes at least one switch tube Q1, and the high potential end of the clamp circuit 22 is connected to the second end of the switch tube Q1.
- the low potential end of the clamp circuit 22 is the auxiliary power reference ground ( The lower end of the capacitor C1 is connected to the second end of the switch tube Q1, that is, to the high potential end of the clamp circuit 22, and the other end of the capacitor C1 is connected to the low potential end of the clamp circuit 22. That is, the other end of the capacitor C1 is grounded.
- the control end of the switch tube Q1 is connected to the first control signal Vgl to control the on and off of the switch tube Q1.
- the switching transistor Q1 When the switching transistor Q1 is turned on under the control of the first control signal Vgl, the current flowing through the switching transistor Q1 flows through the clamping circuit 22 at the same time, and a predetermined voltage drop is generated at both ends of the clamping circuit 22,
- the capacitor C1 When the capacitor C1 is charged by the clamp circuit 22, the auxiliary voltage Vcc is obtained at both ends of the capacitor C1.
- the voltage output from the two-wire dimmer to the load is equal to the difference between the input AC voltage Vin and the voltage drop of the clamp circuit;
- the switch Q1 When the switch Q1 is turned off under the control of the first control signal Vgl, there is no voltage drop across the clamp circuit 22.
- the capacitor C1 is not charged, but is discharged to the load of the auxiliary power source (not shown).
- the auxiliary power source is obtained by using the voltage drop generated at both ends of the clamp circuit when the chopper switch is turned on, and the minimum chopping angle is not required, thereby eliminating the electromagnetic interference problem.
- auxiliary source circuit disclosed in the present invention can employ various forms of chopper switches and clamp circuits, which will be described below in conjunction with specific embodiments.
- FIG. 3 is a circuit diagram of an auxiliary source circuit according to Embodiment 1 of the present invention.
- the auxiliary source circuit includes: a chopper switch 31, a clamp circuit 32, and a capacitor Cl.
- the chopper switch 31 is composed of a rectifier bridge 311 and a switch tube Q1.
- the rectifier bridge 311 includes diodes D1, D2, D3 and D4, a common terminal of the diode D1 cathode and the diode D2 anode, and a common terminal of the diode D3 cathode and the diode D4 anode.
- the common terminal of the diode D2 cathode and the diode D4 cathode is the positive output terminal of the rectifier bridge 311
- the common terminal of the diode D1 anode and the diode D3 anode is the negative output end of the rectifier bridge 311.
- the first end of the switch tube Q1 is connected to the positive output end of the rectifier bridge 311, and the control end is connected to the first control signal Vgl.
- one input end of the rectifier bridge 311 is connected to one end of the AC power source, the other input end is connected to one end of the load, and the other end of the load is connected to the other end of the AC power supply.
- the load may be a switching power supply type load such as an LED driver or the like.
- the low potential end of the clamp circuit 32 (ie, "ground") is connected to the negative output end of the rectifier bridge 311, and includes a Zener diode ZD1 and a resistor R1.
- the cathode of the Zener diode ZD1 is connected to the second end of the switch transistor Q1. Grounding, the resistor R1 is connected in parallel to the two ends of the Zener diode ZD1. When a current flows, the potential of the cathode of the Zener diode ZD1 is higher than the potential of the anode of the Zener diode ZD1.
- the cathode of the Zener diode ZD1 that is, the high potential end of the clamp circuit 32, is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the low potential end of the clamp circuit 32, that is, ground.
- the clamping circuit 32 may include a plurality of voltage stabilizing tubes and resistors, and the plurality of voltage stabilizing tubes are connected end to end to form a branch, the cathode end of the branch is connected to the second end of the switch tube Q1, and the anode end thereof is grounded.
- the resistors are connected in parallel at both ends of the branch.
- FIG. 4 is a circuit diagram of an auxiliary source circuit according to Embodiment 2 of the present invention.
- the auxiliary source circuit includes: a chopper switch 41, a clamp circuit 42, and a capacitor Cl.
- the chopper switch 41 is composed of a rectifier bridge 411 and a switching transistor Q1.
- the rectifier bridge 411 includes diodes D1, D2, D3 and D4, a common terminal of the diode D1 cathode and the diode D2 anode, and a common terminal of the diode D3 cathode and the diode D4 anode.
- the common terminal of the diode D2 cathode and the diode D4 cathode is the positive output terminal of the rectifier bridge 411
- the common terminal of the diode D1 anode and the diode D3 anode is the negative output terminal of the rectifier bridge 411.
- the first end of the switch tube Q1 is connected to the positive output end of the rectifier bridge 411, and the control end is connected to the first control signal Vgl.
- the load may be a switching power supply type load such as an LED driver or the like.
- the clamp circuit 42 includes a diode Drl ⁇ Drn, the diodes Dr1 ⁇ Drn are connected end to end in sequence, the branch formed by the diodes Dr1 ⁇ Drn has an anode end and a cathode end, and the cathode end is connected as a low potential end of the clamp circuit to the rectifier bridge.
- the negative output end of 411, the anode end is connected as the high potential end of the clamp circuit to the second end of the switch tube Q1, and the cathode end is grounded.
- the anode potential of the diode string is higher than the cathode terminal potential when a current flows.
- the potential difference between the high potential terminal and the low potential terminal of the clamp circuit 42 depends on the number of diodes constituting the diode string and the conduction voltage drop of each diode.
- the anode of the diode is connected to the second end of the switch Q1, and the cathode is grounded. In the energized state, the anode of the diode is the high potential end of the clamp circuit 42, and the cathode is the low potential end of the clamp circuit 42.
- Capacitor C1 is connected in parallel across the clamp circuit 42.
- FIG. 5 is a circuit diagram of an auxiliary source circuit according to Embodiment 3 of the present invention.
- the auxiliary source circuit includes: a chopper switch 51, a clamp circuit 52, a fifth diode D5, and a capacitor
- the chopper switch 51 is only composed of the switch tube Q1.
- the first end of the switch tube Q1 is connected to one end of the AC power source, the second end of the switch tube Q1 is connected to the high potential end of the clamp circuit 52, and the control end thereof is connected to the first control signal. Vgl.
- the high potential end of the clamp circuit 52 is respectively connected to the second end of the switch tube Q1 and the anode of the fifth diode D5, the low potential end thereof is grounded, and the low potential end is connected to one end of the load, and the other end of the load is connected to the alternating current.
- the other end of the power supply The cathode of the fifth diode D5 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the low potential end of the clamp circuit 52, that is, grounded.
- clamp circuit 52 in the auxiliary source circuit disclosed in the third embodiment may be the clamp circuit disclosed in the first embodiment or the clamp circuit disclosed in the second embodiment.
- the switching transistor may be one of a triode, a MOS transistor, an IGBT, and a unidirectional thyristor.
- the switch tube adopts a triode
- the first end is a collector
- the second end is an emitter
- the control end is a base
- the switch tube is a MOS tube
- the first end is a drain and the second end is a source.
- the switch is an IGBT
- the first end is a collector, the second end is an emitter, and the control end is a gate
- the switch tube is a unidirectional thyristor
- the first end is an anode
- the second end is an anode.
- the terminal is the cathode and the control terminal is the gate.
- an auxiliary power source can be obtained in both the positive half cycle and the negative half cycle of the alternating current power source.
- the auxiliary source circuit disclosed in the third embodiment only half of the alternating current power source is used.
- the auxiliary power source can be obtained in the cycle, but the structure of the auxiliary source circuit disclosed in the third embodiment is more Add a single order.
- the auxiliary source circuits disclosed in the second embodiment and the third embodiment all use the voltage drop generated at the two ends of the clamp circuit when the chopper switch is turned on to obtain the auxiliary power supply, and the minimum chopping angle is not required. Eliminate electromagnetic interference problems.
- FIG. 6 is a circuit diagram of another auxiliary source circuit disclosed in the present invention.
- the auxiliary source circuit includes: a chopper switch 61, a charge shutdown circuit 62, and a first capacitor Cl.
- the chopper switch 61 includes at least one switch Q1. The first end of the switch Q1 is connected to the first output end of the charge-off circuit 62, the second end is grounded, and the control terminal is connected to the first control signal Vgl.
- the second output terminal of the charging shutdown circuit 62 is connected to one end of the first capacitor C1, and the input terminal thereof is connected to the second control signal Vg2.
- the other end of the first capacitor C1 is connected to the second end of the switch transistor Q1, that is, grounded.
- the control terminal of the switch transistor Q1 is connected to the first control signal Vgl, and the charge shutdown circuit 62 is connected to the second control signal Vg2.
- the first control signal Vgl controls the chopping switch 61 to be turned on (ie, the switching transistor Q1 is turned on)
- the conduction state of the switching transistor Q1 is a linear state
- the second control signal Vg2 controls the charging shutdown circuit 62 to be in a low impedance.
- the voltage drop across the switch Q1 is charged to the first capacitor C1 via the charge-off circuit 62, and the auxiliary voltage Vcc is obtained at both ends of the first capacitor C1.
- the voltage output from the two-wire dimmer to the load is equal to the input AC voltage Vin.
- the second control signal Vg2 controls the charging shutdown circuit 62 to be in a high impedance state, cutting off the first capacitor In the charging circuit of C1, the first capacitor C1 is not charged, and the first capacitor C1 is discharged to the load of the auxiliary power source (not shown in the auxiliary power load diagram).
- the charge-off circuit when the chopper switch is turned on, the charge-off circuit is in a low-impedance state, and the first capacitor C1 is charged to obtain an auxiliary power source, which does not require a minimum chopping angle, thereby eliminating electromagnetic interference. problem.
- auxiliary source circuit disclosed in the present invention can adopt various forms of chopper switches, which will be described below in conjunction with specific embodiments.
- FIG. 7 is a circuit diagram of an auxiliary source circuit according to Embodiment 4 of the present invention.
- the auxiliary source circuit includes: a chopper switch 71, a charge shutdown circuit 72, and a first capacitor C1.
- the chopper switch 71 is composed of a rectifier bridge 711 and a switch tube Q1.
- the rectifier bridge 711 includes diodes D1, D2, D3 and D4, a common terminal of the diode D1 cathode and the diode D2 anode, and a common terminal of the diode D3 cathode and the diode D4 anode.
- diode D2 For the two inputs of the rectifier bridge 711, diode D2
- the common terminal of the cathode and the cathode of the diode D4 is the positive output terminal of the rectifier bridge 711
- the common terminal of the anode of the diode D1 and the anode of the diode D3 is the negative output terminal of the rectifier bridge 711.
- the first end of the switch tube Q1 is connected to the positive output end of the rectifier bridge 311, the second end is grounded, and the control end is connected to the first control signal Vgl.
- the load may be a switching power supply type load such as an LED driver or the like.
- the first output end of the charge-off circuit 72 is connected to the first end of the switch tube Q1, the second output end is connected to one end of the first capacitor C1, and the control end is connected to the second control signal Vg2.
- the other end of the first capacitor C1 is connected to the second end of the switch transistor Q1, that is, grounded.
- the first control signal Vgl controls the chopper switch 71 to be turned on (ie, the switch transistor Q1 is turned on), and operates in a linear state when turned on
- the second control signal Vg2 controls the charge-off circuit 72.
- diodes D2 and D3 in rectifier bridge 711 are turned on, current flow
- auxiliary voltage Vcc is obtained at both ends of the first capacitor C1; when the first control signal Vgl controls the chopper switch 71 to be turned off (ie, the switching transistor Q1 is turned off), the second control signal Vg2 controls the charge-off circuit 72. In a high impedance state, the charging circuit of the first capacitor C1 is turned off, and the first capacitor C1 is not charged.
- the first control signal Vgl controls the chopper switch 71 to be turned on (ie, the switch transistor Q1 is turned on), and operates in a linear state when turned on
- the second control signal Vg2 controls the charge-off circuit 72.
- diodes D4 and D1 in rectifier bridge 711 are turned on, current flow
- auxiliary voltage Vcc is obtained at both ends of the first capacitor C1; when the first control signal Vgl controls the chopper switch 71 to be turned off (ie, the switching transistor Q1 is turned off), the second control signal Vg2 controls the charge-off circuit 72. In a high impedance state, the charging circuit of the first capacitor C1 is turned off, and the first capacitor C1 is not charged.
- FIG. 8 is a circuit diagram of an auxiliary source circuit according to Embodiment 5 of the present invention.
- the auxiliary source circuit includes: a chopper switch 81, a charge shutdown circuit 82, a sixth diode D6, and a first capacitor Cl.
- the chopper switch 81 is only composed of the switch tube Q1, and the first end of the switch tube Q1 is connected to the AC power source. One end is connected, the second end is connected to one end of the load, the control end is connected to the first control signal Vgl, and the other end of the AC power source is connected to the other end of the load.
- the first output end of the charge-off circuit 82 is connected to the first end of the switch tube Q1 through the sixth diode D6, and the anode of the sixth diode D6 is connected to the first end of the switch tube Q1.
- the first output end of the shutdown circuit 82 is connected, the second output end of the charge shutdown circuit 82 is connected to one end of the first capacitor C1, and the input end of the charge shutdown circuit 82 is connected to the second control signal Vg2, the first capacitor C1 The other end is connected to the second end of the switch tube Q1, that is, grounded.
- the auxiliary source circuit disclosed in the fifth embodiment generates an auxiliary power source only in a half cycle of the alternating current power source, and the circuit structure thereof is more compact.
- the first control signal Vgl controls the chopper switch 81 to be turned on (ie, the switch transistor Q1 is turned on), and operates in a linear state when turned on
- the second control signal Vg2 controls the charge-off circuit 82 to operate in a low-impedance state, current Flowing through the switching transistor Q1, the voltage drop generated across the switching transistor Q1 is charged to the first capacitor C1 through the charging shutdown circuit 82, and the auxiliary voltage Vcc is obtained at both ends of the first capacitor C1;
- the first control signal Vgl is controlled
- the second control signal Vg2 controls the charge-off circuit 82 to be in a high-impedance state, and the charging circuit of the first capacitor C1 is turned off, and the first capacitor C1 is not charged.
- FIG. 9 is a circuit diagram of an auxiliary source circuit disclosed in Embodiment 6 of the present invention.
- the auxiliary source circuit includes: a chopper switch 91, a charge shutdown circuit 92, a seventh diode D7, a eighth diode D8, and a first capacitor Cl.
- the chopper switch 91 includes a first switch tube Q1 and a second switch tube Q2.
- the first end of the first switch tube Q1 is connected to one end of the AC power source, the second end thereof is grounded, and the control end thereof is connected to the first control signal. Vgl; the first end of the second switch Q2 is connected to one end of the load, the second end is grounded, the control end is connected to the first control signal Vgl; the other end of the AC power is connected to the other end of the load.
- the anode of the seventh diode D7 is connected to the first end of the first switching transistor Q1, the anode of the eighth diode D8 is connected to the first end of the second switching transistor Q2, and the seventh diode D7 and the eighth diode
- the cathode of pole tube D8 is coupled to a first output of charge shutdown circuit 92.
- the second output end of the charge-off circuit 92 is connected to one end of the capacitor C1, the input end of which is connected to the second control signal Vg2, and the other end of the capacitor C1 is grounded.
- the charge shutdown circuit is in a low impedance state, and the seventh diode D7 is turned on, the first switch tube
- the voltage across Q1 and the second switching transistor Q2 is sequentially charged to the first capacitor C1 through the seventh diode D7 and the charging shutdown circuit 92, and the auxiliary power source Vcc is obtained at both ends of the first capacitor C1; when the first control signal Vgl is controlled
- the chopping switch 92 is turned off, the first switching transistor Q1 and the second switching transistor Q2 are turned off, and the second control signal Vg2 controls the charging shutdown circuit 92 to be in a high impedance state, and the charging path of the first capacitor C1 is cut off, the first capacitor C1 is in the discharge phase to the auxiliary power supply.
- the second switching transistor Q2 operates in a linear state, and the first switching transistor Q1 is turned on, and at this time, the second control signal Vg2 is controlled.
- the charging shutdown circuit is in a low impedance state, the eighth diode D8 is turned on, and the voltage across the first switching transistor Q1 and the second switching transistor Q2 sequentially passes through the eighth diode D8 and the charging shutdown circuit 92 to the first capacitor.
- the auxiliary power supply Vcc is obtained at both ends of the first capacitor C1; when the first control signal Vgl controls the chopping switch 92 to be turned off, the first switching transistor Q1 and the second switching transistor Q2 are turned off, and the second control signal Vg2 is controlled.
- the charge-off circuit 92 is in a high-impedance state, and the charging path of the first capacitor C1 is cut off, and the first capacitor C1 is in a discharge phase to the auxiliary power source.
- the first switch tube and the second switch tube may be MOS tubes, or may be IGBTs with collector and emitter parallel diodes, wherein the anode of the diode is connected to the emitter of the IGBT, and the collector of the cathode and the IGBT Connected.
- the auxiliary power supply structure disclosed in the sixth embodiment is more compact, and the auxiliary power source can be obtained in both the positive half cycle and the negative half cycle of the alternating current power source.
- FIG. 10 is a circuit diagram of an auxiliary source circuit according to Embodiment 7 of the present invention.
- the auxiliary source circuit includes: a chopper switch 101, a charge shutdown circuit 102, a seventh diode D7, an eighth diode D8, a first capacitor Cl, a Boost converter, and a second capacitor C2.
- the structure and operation of the chopper switch 101, the charge-off circuit 102, the seventh diode D7, the eighth diode D8, and the first capacitor C1, and the structure and operation of the auxiliary source circuit disclosed in the sixth embodiment The process is consistent and will not be repeated here.
- the first switch tube and the second switch tube may be a MOS tube, or may be an IGBT with a collector and an emitter parallel diode, wherein the anode of the diode is connected to the emitter of the IGBT, and the collector of the cathode and the IGBT Connected.
- the two inputs of the Boost converter are connected to both ends of the first capacitor C1, the second capacitor C2 is connected between the two outputs of the Boost converter, and the first end of the second capacitor C2 is grounded.
- the output voltage of the auxiliary source circuit can be raised to the voltage required by the auxiliary source by connecting the Boost converter across the first capacitor C1.
- Vcc the voltage generated across the second capacitor C2 is taken as the second output voltage.
- FIG. 11 is a circuit diagram of an auxiliary source circuit according to Embodiment 8 of the present invention.
- the auxiliary source circuit includes: a chopper switch 111, a charge shutdown circuit 112, a seventh diode D7, an eighth diode D8, a first capacitor Cl, a Boost converter, a second capacitor C2, and an auxiliary control circuit 113.
- the chopper switch 111 includes a first switch tube Q1 and a second switch tube Q2.
- the first end of the first switch tube Q1 is connected to one end of the AC power source, the second end thereof is grounded, and the control end thereof is connected to the first control signal. Vgl; the first end of the second switch tube Q2 is connected to one end of the load, the second end of the second switch tube is grounded, the control end is connected to the first control signal Vgl, and the other end of the AC power source is connected to the other end of the load.
- the anode of the seventh diode D7 is connected to the first end of the first switching transistor Q1, the anode of the eighth diode D8 is connected to the first end of the second switching transistor Q2, and the seventh diode D7 and the eighth diode
- the cathode of pole tube D8 is coupled to a first output of charge shutdown circuit 92.
- the second output end of the charge-off circuit 92 is connected to one end of the first capacitor C1, and the input end thereof is connected to the second control signal Vg2, and the other end of the first capacitor C1 is grounded.
- the first switch tube and the second switch tube may be MOS tubes, or IGBTs with collector and emitter parallel diodes, wherein the anode of the diode is connected to the emitter of the IGBT, and the collector of the cathode and the IGBT Connected.
- the two input terminals of the Boost converter are connected to both ends of the first capacitor C1, the second capacitor C2 is connected between the two outputs of the Boost converter, and the first terminal of the second capacitor C2 is grounded.
- the auxiliary control circuit 113 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, an NPN transistor Q3, and a PNP transistor Q4.
- One end of the first resistor R1 is connected to the ungrounded end of the first capacitor C1, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is grounded (ie, the first resistor R1 and the second
- the resistor R2 is connected in series and then connected in parallel to the two ends of the first capacitor C1);
- the base of the NPN transistor Q3 is connected to the common end of the first resistor R1 and the second resistor R2, the emitter is grounded, and the collector passes through the third resistor R3 and the PNP transistor Q4
- the base is connected, the emitter of the PNP transistor Q4 is connected to the ungrounded end of the second capacitor C2, and the collector is connected to the control terminals of the first switching transistor Q1 and
- the resistors R1 and R2 detect the voltage Vdd across the first capacitor C1.
- Vdd exceeds the threshold
- the gate signal voltage of the chopper switch 111 is raised by the NPN transistor Q3 and the PNP transistor Q4.
- the wave switch 111 is turned on, the operating state is close to the saturation region, thereby lowering the voltage charged by the capacitor C1, and the voltage Vdd across the second capacitor C2 is also lowered.
- the auxiliary control circuit 113 is used to implement the closed-loop control, so that the auxiliary control circuit can reduce the loss when the chopper switch 111 is turned on as much as possible when the required supply voltage Vcc is obtained, so that the operation is lower at the time of conduction. Linear state.
- the resistors R1 and R2 are connected in series and then connected in parallel across the first capacitor C1 to detect the voltage of the first capacitor C1.
- the resistors R1 and R2 of the present invention may also be connected in series and then connected in parallel to the second capacitor. Both ends of C2 detect the voltage of the second capacitor C2, and the auxiliary control circuit also achieves the effect of closed-loop regulation, so that the chopper switch 111 is turned on and operates in a linear state with low loss.
- a structure of the charge-off circuit is shown in Fig. 11, and includes: a fifth resistor R5 and a fifth switch tube Q5.
- One end of the fifth resistor R5 is connected to the control end of the fifth switch tube Q5, and the other end of the fifth resistor R5 is connected to the first end of the fifth switch tube Q5, and serves as the first output end of the charge-off circuit 112.
- the second end of the fifth switch tube Q5 serves as the second output end of the charge-off circuit 112, and the control end of the fifth switch tube Q5 is the input end of the charge-off circuit 112.
- the charge-off circuit may be: only the fifth switch tube is included, the first end of the fifth switch tube is the first output end of the charge-off circuit, and the second end is The second output end of the charge-off circuit, the control end is an input end of the charge-off circuit, and is connected to the second control signal Vg2.
- the switching transistor may be one of a triode, a MOS transistor, an IGBT, and a unidirectional thyristor.
- the switch tube adopts a triode
- the first end is a collector
- the second end is an emitter
- the control end is a base
- the switch tube is a MOS tube
- the first end is a drain and the second end is a source.
- the switch is an IGBT
- the first end is a collector, the second end is an emitter, and the control end is a gate
- the switch tube is a unidirectional thyristor
- the first end is an anode
- the second end is an anode.
- the terminal is the cathode and the control terminal is the gate.
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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CN201110045135.6A CN102651926B (zh) | 2011-02-23 | 2011-02-23 | 一种辅助源电路 |
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CN104578772A (zh) * | 2014-12-26 | 2015-04-29 | 福建联迪商用设备有限公司 | 一种升压电路 |
CN110266181B (zh) * | 2018-03-12 | 2022-03-25 | 中兴通讯股份有限公司 | 一种钳位电路及钳位方法 |
CN109378886A (zh) * | 2018-10-26 | 2019-02-22 | 杰华特微电子(杭州)有限公司 | 一种单火线供电电路 |
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US5619081A (en) * | 1994-01-18 | 1997-04-08 | Leviton Manufacturing Co., Inc. | Asymmetrical AC trigger simulation |
CN101171885A (zh) * | 2005-05-12 | 2008-04-30 | 路创电子公司 | 具有电源监视电路的调光器 |
US20090200952A1 (en) * | 2008-02-08 | 2009-08-13 | Purespectrum, Inc. | Methods and apparatus for dimming light sources |
CN101584249A (zh) * | 2006-03-17 | 2009-11-18 | 路创电子公司 | 用于防止不对称电流流过空载的磁低压变压器的调光器 |
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CN201995178U (zh) * | 2011-02-23 | 2011-09-28 | 英飞特电子(杭州)有限公司 | 一种辅助源电路 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US5619081A (en) * | 1994-01-18 | 1997-04-08 | Leviton Manufacturing Co., Inc. | Asymmetrical AC trigger simulation |
CN101171885A (zh) * | 2005-05-12 | 2008-04-30 | 路创电子公司 | 具有电源监视电路的调光器 |
CN101584249A (zh) * | 2006-03-17 | 2009-11-18 | 路创电子公司 | 用于防止不对称电流流过空载的磁低压变压器的调光器 |
US20090200952A1 (en) * | 2008-02-08 | 2009-08-13 | Purespectrum, Inc. | Methods and apparatus for dimming light sources |
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