CN209930020U - On-state charging circuit control circuit and on-state charging circuit - Google Patents
On-state charging circuit control circuit and on-state charging circuit Download PDFInfo
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- CN209930020U CN209930020U CN201920516323.4U CN201920516323U CN209930020U CN 209930020 U CN209930020 U CN 209930020U CN 201920516323 U CN201920516323 U CN 201920516323U CN 209930020 U CN209930020 U CN 209930020U
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Abstract
The utility model discloses a control circuit and logical attitude charging circuit of logical attitude charging circuit, logical attitude charging circuit includes first switch tube, first conduction element, second switch tube and third switch tube, and the series circuit that first input was formed through first conduction element and first switch tube is connected to logical attitude charging circuit's output, and first input is connected to the ground of reference through the second switch tube, and the second input is connected to the ground of reference through the third switch tube; when the load circuit is conducted, the first switch tube is conducted, when the voltage of the output end of the charging circuit relative to the reference ground is lower than a first voltage threshold value, the output end of the charging circuit is in a charging state, when the voltage of the output end rises to a second voltage threshold value, the output end of the charging circuit is in a non-charging state, and when the voltage of the output end of the charging circuit drops to the first voltage threshold value, the charging state is returned; in a non-charging state, the second switching tube and the third switching tube are both conducted.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to on-state charging circuit control circuit and on-state charging circuit.
Background
Various sensor devices can be integrated on the panel of the household appliance control switch, detection and control input interfaces are provided for various devices or lighting lamps, the sensor devices need to supply power for the sensor devices, only one live wire is arranged in a traditional wall mechanical switch cassette, the power supply for a wall switch of a zero wire loop becomes a bottleneck limiting intelligent upgrading of the traditional devices, and a key technical difficulty is achieved in how to provide a stable and safe single live wire power supply scheme.
Fig. 1 shows a single-hot line power supply scheme. The switch K01 is a switch on a switch panel that controls the on and off of the load circuit 100. the load module 100 is typically a lighting load, including incandescent, energy saving fluorescent, LED lighting, etc. The load power ranges from 3W to 1 kW.
In the single hot line supply scheme, the energy storage capacitor CS is charged by controlling the switch K01 connected in series in the hot line. The switch K01 may be implemented as a relay. In order to reduce the drive loss of a common relay and improve the load carrying capacity of single live wire applications, magnetic latching relays are often used. However, the magnetic latching relay causes the complexity of the whole power supply system to be higher, the number of peripheral components of the application system to be more and the cost to be higher.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a single live wire on-state charging circuit's control circuit and on-state charging circuit for thereby solve among the prior art and need adopt the relay to lead to power supply system complicated, application system's peripheral components and parts are more, problem with high costs.
The technical solution of the present invention is to provide a method for controlling an on-state charging circuit, wherein the on-state charging circuit includes a first switch tube, a first conduction element, a second switch tube, a third switch tube, a first input end and a second input end, the first input end is connected to an output end of the on-state charging circuit through a series circuit formed by the first conduction element and the first switch tube, the first input end is connected to a reference ground through the second switch tube, and the second input end is connected to the reference ground through the third switch tube;
when the load circuit is conducted, the first switch tube is conducted, when the voltage of the output end of the charging circuit relative to the reference ground is lower than a first voltage threshold value, the output end of the charging circuit is in a charging state, when the voltage of the output end rises to a second voltage threshold value, the output end of the charging circuit is in a non-charging state, and when the voltage of the output end of the charging circuit drops to the first voltage threshold value, the charging state is returned; in the non-charging state, the second switching tube and the third switching tube are both conducted;
the second voltage threshold is greater than the first voltage threshold;
the first conduction element is a diode or a switching tube.
Optionally, in the charging state, when the first input end voltage is greater than the second input end voltage, the second switching tube is turned off, and the third switching tube is turned off or completely turned on or the drain voltage of the third switching tube is made to approach a third voltage by controlling the controller voltage of the third switching tube; when the voltage of the first input end is smaller than that of the second input end, the third switching tube is completely conducted, and the second switching tube is turned off or completely conducted or the drain voltage of the second switching tube is enabled to be close to the second voltage by controlling the voltage of a controller of the second switching tube.
Optionally, the charging circuit further includes a fourth switching tube and a fourth conducting element, the second input end is connected to the output end of the on-state charging circuit through a series circuit formed by the fourth conducting element and the fourth switching tube, when the load circuit is turned on, the fourth switching tube is turned on, and the fourth conducting element is a diode or a switching tube.
Optionally, the charging circuit further includes a fourth conducting element, the first input terminal is connected to the first switching tube through the first conducting element, the second input terminal is connected to a common terminal of the first switching tube and the first conducting element through the fourth conducting element, and the fourth conducting element is a diode or a switching tube.
Optionally, the charging circuit further includes a fourth switching tube, the first input end is connected to the first conducting element through the first switching tube, the second input end is connected to a common end of the first switching tube and the first conducting element through the fourth conducting element, and when the load circuit is turned on, the fourth switching tube is turned on.
Optionally, in the charging state, when the first input end voltage is greater than the second input end voltage, the second switching tube is turned off, and the third switching tube is turned off or completely turned on or the drain voltage of the third switching tube is made to approach a third voltage by controlling the controller voltage of the third switching tube; when the voltage of the first input end is smaller than that of the second input end, the third switching tube is turned off, and the second switching tube is turned off or is completely turned on or the drain voltage of the second switching tube is close to the second voltage by controlling the voltage of a controller of the second switching tube.
Optionally, in the charging state, when the input current is smaller than the first current threshold, the output terminal is charged.
Optionally, in the charging state, when the current of the first switching tube or the fourth switching tube is greater than a first current threshold, the first switching tube is turned off, and the second switching tube and the third switching tube are turned on.
Another technical solution of the present invention is to provide a control circuit of an on-state charging circuit, wherein the on-state charging circuit includes a first switch tube, a first conduction element, a second switch tube, a third switch tube, a first input end and a second input end, the first input end is connected to an output end of the on-state charging circuit through a series circuit formed by the first conduction element and the first switch tube, the first input end is connected to a reference ground through the second switch tube, and the second input end is connected to the reference ground through the third switch tube;
when the control circuit receives a signal for indicating that the load circuit is conducted, the control circuit controls the first switch tube to be conducted, when the voltage of the output end of the charging circuit relative to the reference ground is lower than a first voltage threshold value, the control circuit controls the output end of the charging circuit to be in a charging state, when the voltage of the output end rises to a second voltage threshold value, the control circuit controls the output end of the charging circuit to be in a non-charging state, and when the voltage of the output end of the charging circuit falls to the first voltage threshold value, the control circuit returns to the charging state; when the charging circuit is in a non-charging state, the control circuit controls the second switching tube and the third switching tube to be conducted;
the second voltage threshold is greater than the first voltage threshold;
the first conduction element is a diode or a switching tube.
Optionally, the control circuit detects voltages at the first input end and the second input end, and in the charging state, when the voltage at the first input end is greater than the voltage at the second input end, the control circuit controls the second switching tube to be turned off, controls the third switching tube to be turned off or completely turned on, or controls the voltage at the control electrode of the third switching tube to make the drain voltage of the third switching tube approach to a third voltage; when the voltage of the first input end is smaller than that of the second input end, the control circuit controls the third switching tube to be completely conducted, and controls the second switching tube to be switched off or completely conducted or controls the voltage of a controller of the second switching tube to enable the voltage of a drain electrode of the second switching tube to be close to the second voltage.
Optionally, the charging circuit further includes a fourth switching tube and a fourth conducting element, the second input end is connected to the output end of the on-state charging circuit through a series circuit formed by the fourth conducting element and the fourth switching tube, when the control circuit receives a signal indicating that the load circuit is conducted, the control circuit controls the fourth switching tube to be conducted, and the fourth conducting element is a diode or a switching tube.
The utility model discloses a technical solution is still, provides a single live wire charging circuit.
Adopt the utility model discloses a circuit structure and method, compared with the prior art, have following advantage: the application of single live wire is simpler, has saved the relay component, and is wider on the scope of taking load power to use, can realize system integration simultaneously, reduces and uses the volume, and the cost is reduced can realize traditional equipment thing allies oneself with and intelligent control's upgrading.
Drawings
FIG. 1 is a schematic diagram of a half-wave power supply of a single line cable in the prior art;
FIG. 2 is a schematic diagram of a single-live-wire half-wave power supply circuit of the present invention;
fig. 3 is a flowchart illustrating a control method of a single line charging circuit according to an embodiment of the present invention;
fig. 4(a) is a waveform diagram of input voltage, input current, output voltage, second switch tube control pole and third switch tube control pole voltage in a half-wave power supply embodiment of the present invention;
fig. 4(b) is a waveform diagram of the input voltage, input current, output voltage, second switch tube control pole and third switch tube controller pole voltage in another half-wave power supply embodiment of the present invention;
FIG. 5 is a schematic diagram of a single live wire full-wave power supply circuit of the present invention;
fig. 6 is a schematic diagram of a single live wire full wave power supply circuit according to another embodiment of the present invention;
fig. 7 is a flow chart illustrating a method for controlling a single line charging circuit according to an embodiment of the present invention;
fig. 8 is a flow chart illustrating a method for controlling a single line charging circuit according to another embodiment of the present invention;
fig. 9 is a schematic diagram of a single live line full-wave power supply circuit according to yet another embodiment of the present invention;
fig. 10 is a flow chart illustrating a method of controlling a single hot line charging circuit according to an embodiment of the present invention corresponding to the full wave power supply of fig. 9;
fig. 11 is a flow chart illustrating a method of controlling a single hot line charging circuit according to another embodiment of the present invention corresponding to the full wave power supply of fig. 9;
fig. 12(a) is a waveform diagram of input voltage, input current, output voltage, second switch tube control pole and third switch tube control pole voltage in an embodiment of the present invention for full-wave power supply;
fig. 12(b) is a waveform diagram of input voltage, input current, output voltage, second switch tube control pole and third switch tube control pole voltage in another embodiment of the present invention for full-wave power supply;
fig. 13 is a schematic circuit diagram of the control circuit 100 according to an embodiment of the present invention;
fig. 14 is a schematic diagram of a single-live-wire half-wave power supply circuit according to another embodiment of the present invention;
fig. 15 is a schematic circuit diagram of the control circuit 100 according to another embodiment of the present invention;
fig. 16 is a schematic circuit diagram of the control circuit 100 according to an embodiment of the present invention;
fig. 17 is a schematic circuit diagram of the control circuit 100 according to another embodiment of the present invention in full-wave power supply.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.
The utility model provides a control method of on-state charging circuit, please refer to fig. 2, the on-state charging circuit includes first switch tube Q01, first conducting element D01, second switch tube Q02, third switch tube Q03, first input L1 and second input L2, first input L1 is connected to the output VO of on-state charging circuit through the series circuit that first conducting element D01 and first switch tube Q01 formed, first input L1 is connected to reference ground through second switch tube Q02, second input L2 is connected to reference ground through third switch tube Q03;
when the load circuit is conducted, the first switch tube Q01 is conducted, when the voltage of the output end of the charging circuit relative to the reference ground is lower than a first voltage threshold value, the output end of the charging circuit is in a charging state, when the voltage of the output end rises to a second voltage threshold value, the output end of the charging circuit is in a non-charging state, and when the voltage of the output end of the charging circuit drops to the first voltage threshold value, the charging state is returned; in the non-charging state, the second switching tube Q02 and the third switching tube Q03 are both turned on;
the second voltage threshold is greater than the first voltage threshold;
the first conduction element is a diode or a switching tube.
In fig. 2, the first switch Q01 and the first pass element D01 are connected in series, and the positions of the first switch Q01 and the first pass element D01 can be switched.
When the load circuit is turned off, the AC input charges the output terminal through the off-state charging circuit.
The first switch tube, the second switch tube and the third switch tube in the present embodiment are preferably MOS transistors, more specifically NMOS transistors, but may be other types of switch tubes, such as triodes, thyristors, switch tubes formed by connecting a plurality of the foregoing tubes, and the like.
Referring to fig. 3, an embodiment of a method for controlling a single-fire on-state charging circuit is shown.
Step S001: judging whether the lighting load is conducted or not; if not, go to step S002; if on, the process proceeds to step S003.
Step S002: the first switch tube Q01, the second switch tube Q02 and the third switch tube Q03 are all turned off.
Step S003: the first switching tube Q01 is turned on, and the process advances to step S004.
Step S004: and judging whether the output voltage VO is larger than the reference voltage VREF, if so, entering the step S005, and if not, entering the step S006.
Step S005: in the non-charging state, the second switching tube Q02 and the third switching tube Q03 are both turned on, and the process returns to step S004.
Step S006: when the charging state is achieved, whether the first input end voltage VDP is larger than the second input end voltage VDN is judged. If yes, the process proceeds to step S007, and if no, the process proceeds to step S008.
Step S007: when the first input end voltage VDP is greater than the second input end voltage VDN, the second switching tube Q02 is turned off, and the third switching tube Q03 is turned off or turned on completely or the drain voltage of the third switching tube is made to approach the third voltage by controlling the controller voltage of the third switching tube. Return to step S004. Referring to fig. 4(a), the second transistor Q02 and the third transistor Q03 are NMOS, and G2 and G3 are gates of the second transistor Q02 and the third transistor Q03, respectively. During the period from t11 to t12, VDP is greater than VDN, G2 is low, the second switch Q02 is turned off, and current flows from L1 through D02, the first switch Q01 and the first inductor L01 to charge the output VO. When the third switching tube is turned off, the current flows from the output body diode passing through the third switching tube to the second input terminal L2. In order to further reduce the loss, the third switching tube Q03 may be controlled to be fully turned on or the drain voltage of the third switching tube may be controlled to approach the third voltage by controlling the voltage of the controller of the third switching tube, so as to reduce the turn-on voltage drop and improve the system efficiency. Therefore, in fig. 4(a), in the interval t11-t12, the waveform of G3 is indicated by a dashed line, and may be in the form of a dashed line or a low potential.
Step S008: when the first input voltage VDP is less than the second input voltage VDN, the third transistor Q03 is turned on completely, as shown in fig. 4(a), the third transistor is an NMOS, and the gate voltage G3 of the third transistor is high. The second switch tube Q02 is turned off or fully turned on or the drain voltage of the second switch tube is made to approach the second voltage by controlling the voltage of the control electrode of the second switch tube. Return to step S004. At this time, the output voltage VO is not charged, and when the second switch is turned off, the current flows from the second input terminal L2 through the third switch Q03, and then flows into the first input terminal L1 through the body diode of the second switch. In order to further reduce the loss, the third switching tube Q02 may be controlled to be fully turned on or the drain voltage of the second switching tube may be controlled to approach the second voltage by controlling the voltage of the controller of the second switching tube, so as to reduce the turn-on voltage drop and improve the system efficiency. Therefore, in fig. 4(a), in the interval t13-t14, the waveform of G2 is indicated by a dashed line, and may be in the form of a dashed line or a low potential.
In the charging state, the current passing through the first pass device D01 is determined by the input current, and when the input current is large, the current passing through the first pass device D01 is also large, the loss of the first pass device D01 is large, and heat generation is serious, and in order to reduce the loss of the first pass device, the output is charged only when the input current is small. Referring to fig. 4(b), between t21-t22, the input current is smaller than the first current threshold, G2 is low, the second switch is turned off, and the output is charged. Between t22-t23, the input current is larger than the first current threshold, G2 is high, the second switch tube is conducted, and the current passes from the first input end L1, through the second switch tube, to the third switch tube, and then to the second input end L1, without charging the output. The gate voltage G3 of the third switch tube may be high or low. When the gate voltage G3 of the third switch tube is low, current passes through the body diode of the third switch tube. In order to further reduce the loss, the grid voltage of the third switching tube is controlled to be high, the third switching tube is conducted, and the voltage drop of the current on the third switching tube is further reduced.
In the half-wave power supply mode, the capacitor CS can be charged only for half the power frequency period, and in order to improve the output power range, the charging circuit can adopt a full-wave power supply mode. Referring to fig. 5, the charging circuit further includes a fourth switch Q04 and a fourth conducting device D04, the second input terminal L2 is connected to the output terminal of the on-state charging circuit through a series circuit formed by the fourth conducting device D04 and the fourth switch Q04, when the load circuit is turned on, the fourth switch Q04 is turned on, and the fourth conducting device is a diode or a switch.
In another embodiment of full-wave power supply, the fourth conducting element may be omitted on the basis of fig. 5, and only the fourth switching tube is used. Referring to fig. 6, the charging circuit further includes a fourth switching tube, the first input end is connected to the first conducting element through the first switching tube, the second input end is connected to the common end of the first switching tube and the first conducting element through the fourth conducting element, and when the load circuit is turned on, the fourth switching tube is turned on.
The manner of full-wave power supply of fig. 5 and 6 may adopt a flow chart as shown in fig. 7, including the following steps:
step S101: judging whether the lighting load is conducted or not; if not, the step S102 is entered; if on, the process proceeds to step S103.
Step S102: the first switch tube Q01, the second switch tube Q02 and the third switch tube Q03 are all turned off.
Step S103: the first switch Q01 and the fourth switch Q04 are both turned on, and the process goes to step S104.
Step S104: and judging whether the output voltage VO is greater than the reference voltage VREF, if so, entering step S105, and if not, entering step S106.
Step S105: in the non-charging state, the second switching tube Q02 and the third switching tube Q03 are both turned on, and the process returns to step S104.
Step S106: when the charging state is achieved, whether the first input end voltage VDP is larger than the second input end voltage VDN is judged. If yes, the process proceeds to step S107, and if no, the process proceeds to step S108.
Step S107: when the first input end voltage VDP is greater than the second input end voltage VDN, the second switching tube Q02 is turned off, and the third switching tube Q03 is fully turned on or the drain voltage of the third switching tube is made to approach the third voltage by controlling the controller voltage of the third switching tube. Return to step S004.
Step S108: when the first input end voltage VDP is less than the second input end voltage VDN, the third switching tube Q03 is turned off, and the second switching tube Q02 is fully turned on or the drain voltage of the second switching tube is made to approach the second voltage by controlling the controller voltage of the second switching tube. Return to step S004.
In step S107 and step S108, Q02 may be turned off, and Q03 may be turned off. In this embodiment, it is not necessary to determine the first input voltage VDP and the second input voltage VDN, and therefore, the flowchart shown in fig. 8 includes the following steps:
step S101: judging whether the lighting load is conducted or not; if not, the step S102 is entered; if on, the process proceeds to step S103.
Step S102: the first switch tube Q01, the second switch tube Q02 and the third switch tube Q03 are all turned off.
Step S103: the first switch Q01 and the fourth switch Q04 are both turned on, and the process goes to step S104.
Step S104: and judging whether the output voltage VO is larger than the reference voltage VREF, if so, entering step S105, and if not, entering step S109.
Step S105: in the non-charging state, the second switching tube Q02 and the third switching tube Q03 are both turned on, and the process returns to step S104.
Step S109: in the charging state, the second switching tube Q02 and the third switching tube Q03 are both turned off, and the process returns to step S104.
Referring to fig. 12(a), the second transistor Q02 and the third transistor Q03 are NMOS, and G2 and G3 are gates of the second transistor Q02 and the third transistor Q03, respectively. During the period from t31 to t32, VDP is greater than VDN, G2 is low, the second switch Q02 is turned off, and current flows from L1 through the first switch Q01 to charge the output VO. When the third switching tube is turned off, the current flows from the output body diode passing through the third switching tube to the second input terminal L2. In order to further reduce the loss, the third switching tube Q03 may be controlled to be fully turned on or the drain voltage of the third switching tube may be controlled to approach the third voltage by controlling the voltage of the controller of the third switching tube, so as to reduce the turn-on voltage drop and improve the system efficiency. Therefore, in fig. 12(a), in the interval t31-t32, the waveform of G3 is indicated by a dashed line, and may be in the form of a dashed line or a low potential.
In yet another embodiment of full-wave power supply, the fourth switch tube may be omitted on the basis of fig. 5, and only the fourth pass element is used. Referring to fig. 9, the charging circuit further includes a fourth conducting device D04, the first input terminal L1 is connected to the first switch transistor Q01 through the first conducting device D01, the second input terminal L2 is connected to a common terminal of the first switch transistor and the first conducting device through the fourth conducting device D04, and the fourth conducting device is a diode or a switch transistor. Compared with the connection mode of fig. 5 and 6, the circuit connection mode does not need to control the fourth switching tube, and the control is more convenient. As shown in fig. 10 and 11, compared with the flowcharts of fig. 7 and 8, the flowchart of the implementation manner of fig. 9 only needs to modify step S103 of fig. 7 and 8 to turn on the first switch tube Q01, and is not described herein again.
In the charging state, in fig. 5, the current passing through the first conducting device D01, the first switching transistor Q01, the fourth conducting device D04 and the fourth switching transistor Q04, in fig. 6, the current passing through the first conducting device D01, the first switching transistor Q01 and the fourth conducting device D04, in fig. 9, the current passing through the first conducting device D01, the first switching transistor Q01 and the fourth conducting device D04 is determined by the input current, and when the input current is large, the current passing through these components is also large, the loss is large, the heat generation is severe, and in order to reduce the loss, the output is charged only when the input current is small. Referring to fig. 12(b), between t41-t42, the input current is smaller than the first current threshold, G2 is low, the second switch is turned off, and the output is charged. Between t42-t43, the input current is larger than the first current threshold, G2 is high, the second switch tube is conducted, and the current passes from the first input end L1, through the second switch tube, to the third switch tube, and then to the second input end L1, without charging the output. The gate voltage G3 of the third switch tube may be high or low. When the gate voltage G3 of the third switch tube is low, current passes through the body diode of the third switch tube. In order to further reduce the loss, the grid voltage of the third switching tube is controlled to be high, the third switching tube is conducted, and the voltage drop of the current on the third switching tube is further reduced.
Another technical solution of the present invention is to provide a control circuit of an on-state charging circuit, please refer to fig. 2, the on-state charging circuit includes a first switch tube Q01, a first conducting element D01, a second switch tube Q02, a third switch tube Q03, a first input end L1 and a second input end L2, the first input end L1 is connected to an output end of the on-state charging circuit through a series circuit formed by the first conducting element D01 and the first switch tube Q01, the first input end L1 is connected to a reference ground through the second switch tube Q02, and the second input end L2 is connected to the reference ground through the third switch tube Q03;
when the control circuit receives a signal for indicating that the load circuit is conducted, the control circuit controls the first switch tube to be conducted, when the voltage of the output end of the charging circuit relative to the reference ground is lower than a first voltage threshold value, the control circuit controls the output end of the charging circuit to be in a charging state, when the voltage of the output end rises to a second voltage threshold value, the control circuit controls the output end of the charging circuit to be in a non-charging state, and when the voltage of the output end of the charging circuit falls to the first voltage threshold value, the control circuit returns to the charging state; when the charging circuit is in a non-charging state, the control circuit controls the second switching tube and the third switching tube to be conducted;
the second voltage threshold is greater than the first voltage threshold; the first conduction element is a diode or a switching tube.
In one embodiment, the control circuit 100 detects voltages at the first input terminal L1 and the second input terminal L2, and in the charging state, when the voltage VDP at the first input terminal is greater than the voltage VDN at the second input terminal, the control circuit 100 controls the second switching tube Q02 to be turned off, controls the third switching tube Q03 to be turned off or completely turned on, or controls the voltage of a controller of the third switching tube to make the drain voltage of the third switching tube approach to a third voltage; when the voltage VDP at the first input end is less than the voltage VDN at the second input end, the control circuit 100 controls the third switching tube Q03 to be fully turned on, and controls the second switching tube Q02 to be turned off or fully turned on, or controls the voltage of the control electrode of the second switching tube to make the voltage of the drain electrode of the second switching tube approach to the second voltage.
In one embodiment, referring to fig. 13, the control circuit 100 includes a comparison circuit 101, a voltage feedback circuit 102, a logic circuit 103 and a driving circuit 104. The voltage feedback circuit 102 receives the output voltage, compares the output voltage with the first voltage threshold and the second voltage threshold, and outputs a representation of whether the output end of the voltage feedback circuit is in a charging state; the logic circuit 103 receives the output voltage of the voltage feedback circuit 102. The comparison circuit 101 compares the magnitudes of the voltages VDP and VREF1 at the first input end, the output of which represents the magnitudes of the voltages at the first input end and the second input end, and the logic circuit 103 receives the output voltage of the comparison circuit 101. The logic circuit 103 also receives a signal a that characterizes the load as being on or off. The driving circuit 104 receives the output voltage of the logic circuit 103 and drives the first switch tube, the second switch tube and the third switch tube. When the logic circuit 103 receives a signal indicating that the load circuit is turned off, the logic circuit controls the driving circuit 104 to drive the first switching tube, the second switching tube and the third switching tube to be turned off. When the logic circuit 103 receives a signal for representing the conduction of the load circuit, the logic circuit controls the driving circuit 104 to drive the first switching tube to conduct, the voltage feedback circuit 102 compares the voltage of the output end with a first voltage threshold value and a second voltage threshold value, when the voltage of the output end of the charging circuit relative to the reference ground is lower than the first voltage threshold value, the output representation output end of the voltage feedback circuit 102 is in a charging state, when the voltage of the output end rises to the second voltage threshold value, the output representation output end of the voltage feedback circuit 102 is in a non-charging state, and when the voltage of the output end of the charging circuit falls to the first voltage threshold value, the charging state is returned; in the charging state, when the comparator 101 detects that the voltage VDP at the first input end is greater than the voltage VDN at the second input end, the logic circuit 103 controls the driving circuit 104 to drive the second switching tube Q02 to turn off, drive the third switching tube Q03 to turn off or completely turn on, or control the voltage of the controller of the third switching tube to make the drain voltage of the third switching tube approach to the third voltage; when the comparator 101 detects that the voltage VDP at the first input end is less than the voltage VDN at the second input end, the logic circuit 103 controls the driving circuit 104 to drive the third switching tube Q03 to be fully turned on, and drive the second switching tube Q02 to be turned off or fully turned on, or control the voltage of the controller of the second switching tube to make the drain voltage of the second switching tube approach to the second voltage; in the non-charging state, the logic circuit 103 controls the driving circuit 104 to drive the second transistor Q02 and the third transistor Q03 to be turned on.
In the charging state, the current passing through the first pass device D01 is determined by the input current, and when the input current is large, the current passing through the first pass device D01 is also large, the loss of the first pass device D01 is large, and heat generation is serious, and in order to reduce the loss of the first pass device, the output is charged only when the input current is small. Referring to fig. 14, one embodiment of a single-fire on-state charging circuit IS shown, with current sensing terminals IS1 and IS2 added. Referring to fig. 15, the circuit block diagram of the control circuit 100 further includes a first current sampling circuit 106, a first current comparing circuit 107, a second current sampling circuit 108, and a second current comparing circuit 109. The logic circuit 103 receives the output voltages of the first current comparison circuit 107 and the second current comparison circuit 109. The first current sampling circuit 106 samples the current flowing through the first switch tube, and the second current sampling circuit 106 samples the current flowing through the second switch tube, wherein the two currents represent the input current. It should be noted that the input current may also be characterized by sampling the current elsewhere. When the first current comparison circuit 107 or the first current comparison circuit 109 detects that the input current is smaller than the first current threshold, the logic circuit 103 controls the driving circuit 104 to drive the second switch tube to turn off, so as to charge the output. When the first current comparison circuit 107 or the first current comparison circuit 109 detects that the input current is greater than the first current threshold, the logic circuit 103 controls the driving circuit 104 to drive the second switch tube to be turned on, and the current passes through the second switch tube from the first input end L1 to the third switch tube and then to the second input end L1, so that the output is not charged. The gate voltage G3 of the third switch tube may be high or low. When the gate voltage G3 of the third switch tube is low, current passes through the body diode of the third switch tube. In order to further reduce the loss, the grid voltage of the third switching tube is controlled to be high, the third switching tube is conducted, and the voltage drop of the current on the third switching tube is further reduced.
In the half-wave power supply mode, the capacitor CS can be charged only for half the power frequency period, and in order to improve the output power range, the charging circuit can adopt a full-wave power supply mode. Referring to fig. 5, the charging circuit further includes a fourth switch Q04 and a fourth conducting device D04, the second input terminal L2 is connected to the output terminal of the on-state charging circuit through a series circuit formed by the fourth conducting device D04 and the fourth switch Q04, when the load circuit is turned on, the fourth switch Q04 is turned on, and the fourth conducting device is a diode or a switch.
In another embodiment of full-wave power supply, the fourth conducting element may be omitted on the basis of fig. 5, and only the fourth switching tube is used. Referring to fig. 6, the charging circuit further includes a fourth switching tube, the first input end is connected to the first conducting element through the first switching tube, the second input end is connected to the common end of the first switching tube and the first conducting element through the fourth conducting element, and when the load circuit is turned on, the fourth switching tube is turned on.
In one embodiment, as shown in fig. 16, the block diagram of the control circuit 100, when the lighting load is turned on, the logic circuit 103 controls the driving circuit 104 to drive both the first switch tube and the fourth switch tube to be turned on. In the charging state, when the comparator 101 detects that the voltage VDP at the first input end is greater than the voltage VDN at the second input end, the logic circuit 103 controls the driving circuit 104 to drive the second switching tube Q02 to turn off, drive the third switching tube Q03 to turn off or completely turn on, or control the voltage of the control electrode of the third switching tube Q03 to make the voltage of the drain electrode of the third switching tube Q03 approach to the third voltage; when the comparator 101 detects that the voltage VDP at the first input end is less than the voltage VDN at the second input end, the logic circuit 103 controls the driving circuit 104 to drive the third switching tube Q03 to turn off, drive the second switching tube Q02 to turn off or completely turn on, or control the voltage of the controller of the second switching tube to make the drain voltage of the second switching tube approach to the second voltage; in the non-charging state, the logic circuit 103 controls the driving circuit 104 to drive the second transistor Q02 and the third transistor Q03 to be turned on.
In the above embodiment, if the first input voltage VDP is greater than the second input voltage VDN and the first input voltage VDP is less than the second input voltage VDN, the second transistor Q02 and the third transistor Q03 are both turned off, so that the first input voltage and the second input voltage do not need to be determined, and therefore the comparator 101 can be omitted, and the block diagram of the control circuit 100 is as shown in fig. 17.
In yet another embodiment of full-wave power supply, the fourth switch tube may be omitted on the basis of fig. 5, and only the fourth pass element is used. Referring to fig. 9, the charging circuit further includes a fourth conducting device D04, the first input terminal L1 is connected to the first switch transistor Q01 through the first conducting device D01, the second input terminal L2 is connected to a common terminal of the first switch transistor and the first conducting device through the fourth conducting device D04, and the fourth conducting device is a diode or a switch transistor. Compared with the connection mode of fig. 5 and 6, the circuit connection mode does not need to control the fourth switching tube, and the control is more convenient. Therefore, in the control circuit 100, based on fig. 16 and fig. 17, the driving circuit 104 does not need to drive the fourth switching tube, and the rest is the same, and is not described herein again.
In the charging state, in fig. 5, the current passing through the first conducting device D01, the first switching transistor Q01, the fourth conducting device D04 and the fourth switching transistor Q04, in fig. 6, the current passing through the first conducting device D01, the first switching transistor Q01 and the fourth conducting device D04, in fig. 9, the current passing through the first conducting device D01, the first switching transistor Q01 and the fourth conducting device D04 is determined by the input current, and when the input current is large, the current passing through these components is also large, the loss is large, the heat generation is severe, and in order to reduce the loss, the output is charged only when the input current is small. In full-wave power supply, the input current can be represented by sampling the current of the first switch tube or/and the first conducting element or/and the fourth switch tube or/and the second switch tube or/and the third switch tube, the difference between full-wave power supply and half-wave power supply is that when the first input end voltage is smaller than the second input end voltage, the full-wave power supply circuit can charge the output end, and the first current comparison circuit 107 and the second current comparison circuit 109 also need to judge the magnitude of the input current and the first current threshold, and the logic circuit 103 controls the third switch tube Q03 to be turned off to charge the output end when the current is smaller than the first current threshold; when the current is larger than the first current threshold, the logic circuit 103 controls the third switching tube Q03 to be turned on, so that the output end is not charged.
In an embodiment, please refer to fig. 2, fig. 5 and fig. 6, the charging circuit further includes a microprocessor MCU, which receives the signal of turning on or off the load circuit, converts the signal into a signal a representing turning on or off of the load circuit, and sends the signal a to the control circuit 100. The utility model discloses a technical solution is still, provides a single live wire charging circuit.
It should be noted that, in some embodiments, a half-wave power supply circuit is used as an example, and these embodiments are not limited to the half-wave power supply circuit, and may be applied to a full-wave power supply circuit.
Although the embodiments have been described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments not explicitly described, or to another embodiment described.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (9)
1. A control circuit of an on-state charging circuit is characterized in that: the on-state charging circuit comprises a first switch tube, a first conducting element, a second switch tube, a third switch tube, a first input end and a second input end, wherein the first input end is connected to the output end of the on-state charging circuit through a series circuit formed by the first conducting element and the first switch tube, the first input end is connected to a reference ground through the second switch tube, and the second input end is connected to the reference ground through the third switch tube;
when the control circuit receives a signal for representing the conduction of a load circuit, the control circuit controls the conduction of the first switch tube, when the voltage of the output end of the charging circuit relative to the reference ground is lower than a first voltage threshold value, the control circuit controls the output end of the charging circuit to be in a charging state, when the voltage of the output end rises to a second voltage threshold value, the control circuit controls the output end of the charging circuit to be in a non-charging state, and when the voltage of the output end of the charging circuit falls to the first voltage threshold value, the control circuit returns to the charging state; when the charging circuit is in a non-charging state, the control circuit controls the second switching tube and the third switching tube to be conducted;
the second voltage threshold is greater than the first voltage threshold;
the first conduction element is a diode or a switching tube.
2. The control circuit of the on-state charging circuit of claim 1, wherein: the control circuit detects voltages at the first input end and the second input end, and in the charging state, when the voltage at the first input end is greater than the voltage at the second input end, the control circuit controls the second switching tube to be turned off, controls the third switching tube to be turned off or completely turned on, or controls the voltage of a control electrode of the third switching tube to enable the voltage of a drain electrode of the third switching tube to be close to a third voltage; when the voltage of the first input end is smaller than that of the second input end, the control circuit controls the third switching tube to be completely conducted, and controls the second switching tube to be switched off or completely conducted or controls the voltage of a controller of the second switching tube to enable the voltage of a drain electrode of the second switching tube to be close to the second voltage.
3. The control circuit of the on-state charging circuit of claim 1, wherein: the charging circuit further comprises a fourth switch tube and a fourth conduction element, the second input end is connected to the output end of the on-state charging circuit through a series circuit formed by the fourth conduction element and the fourth switch tube, when the control circuit receives a signal representing that the load circuit is conducted, the control circuit controls the fourth switch tube to be conducted, and the fourth conduction element is a diode or a switch tube.
4. The control circuit of the on-state charging circuit of claim 1, wherein: the charging circuit further comprises a fourth conducting element, the first input end is connected to the first switching tube through the first conducting element, the second input end is connected to the common end of the first switching tube and the first conducting element through the fourth conducting element, and the fourth conducting element is a diode or a switching tube.
5. The control circuit of the on-state charging circuit of claim 1, wherein: the charging circuit further comprises a fourth switching tube, the first input end is connected to the first conduction element through the first switching tube, the second input end is connected to the common end of the first switching tube and the first conduction element through the fourth switching tube, and when the load circuit is conducted, the fourth switching tube is conducted.
6. The control circuit of the on-state charging circuit of claim 3, 4 or 5, wherein: the control circuit detects voltages at the first input end and the second input end, and in the charging state, when the voltage at the first input end is greater than the voltage at the second input end, the control circuit controls the second switching tube to be turned off, and the control circuit controls the third switching tube to be turned off or completely turned on or controls the voltage of a control electrode of the third switching tube to enable the voltage of a drain electrode of the third switching tube to be close to a third voltage; when the voltage of the first input end is smaller than that of the second input end, the control circuit controls the third switching tube to be turned off, and the control circuit controls the second switching tube to be turned off or completely turned on or controls the voltage of a controller of the second switching tube to enable the voltage of a drain electrode of the second switching tube to be close to the second voltage.
7. The control circuit of the on-state charging circuit of any one of claims 1-5, wherein: in the charging state, when the input current is smaller than a first current threshold value, the output end is charged.
8. The control circuit of the on-state charging circuit of claim 7, wherein: in the charging state, when the current of the first switching tube is larger than a first current threshold value, the control circuit controls the first switching tube to be turned off, and the control circuit controls the second switching tube and the third switching tube to be turned on.
9. An on-state charging circuit, comprising: comprising a control circuit according to any of claims 1-8.
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| CN201920516323.4U CN209930020U (en) | 2019-04-16 | 2019-04-16 | On-state charging circuit control circuit and on-state charging circuit |
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| CN201920516323.4U CN209930020U (en) | 2019-04-16 | 2019-04-16 | On-state charging circuit control circuit and on-state charging circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061553A (en) * | 2019-04-16 | 2019-07-26 | 杰华特微电子（杭州）有限公司 | On-state control method for charging circuit, control circuit and on-state charging circuit |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061553A (en) * | 2019-04-16 | 2019-07-26 | 杰华特微电子（杭州）有限公司 | On-state control method for charging circuit, control circuit and on-state charging circuit |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
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