CN209930023U - Control circuit of single live wire charging circuit and single live wire charging circuit - Google Patents
Control circuit of single live wire charging circuit and single live wire charging circuit Download PDFInfo
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- CN209930023U CN209930023U CN201920511861.4U CN201920511861U CN209930023U CN 209930023 U CN209930023 U CN 209930023U CN 201920511861 U CN201920511861 U CN 201920511861U CN 209930023 U CN209930023 U CN 209930023U
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Abstract
The utility model discloses a single live wire charging circuit's control circuit and single live wire charging circuit, first input end is connected to the first end of first switch tube through second conduction element, and first switch tube, first conduction element and first inductance constitute step-down circuit, and first input end is connected to the ground of reference through the second switch tube, and the second input end is connected to the ground of reference through the third switch tube; when the load circuit is switched off, the first switching tube, the first conduction element and the first inductor work in a voltage reduction mode, and the second switching tube and the third switching tube are switched off; when the load circuit 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 is reduced to the first voltage threshold value, the charging state is returned.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to single live wire charging circuit's control circuit and single live wire 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 charging circuit's control circuit and single live wire 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 control method for a single live wire charging circuit, where the charging circuit includes a first switch tube, a first conduction element, a first inductor, a second switch tube, a second conduction element, a third switch tube, a first input end and a second input end, the first input end is connected to the first end of the first switch tube through the second conduction element, the first switch tube, the first conduction element and the first inductor constitute a BUCK voltage reduction circuit, the first input end is connected to a reference ground through the second switch tube, the second input end is connected to the reference ground through the third switch tube, and an ac input is connected to the first input end through a load circuit;
when the load circuit is turned off, the first switch tube, the first conducting element and the first inductor work in a BUCK step-down mode, and the second switch tube and the third switch tube are turned off;
when the load circuit 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;
the second voltage threshold is greater than the first voltage threshold;
the first conduction element and the second conduction element are diodes or switching tubes.
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; and in the non-charging state, the second switching tube and the third switching tube are both conducted.
Optionally, the charging circuit further includes a third conducting element, and the second input terminal is connected to the first terminal of the first switching tube through the third conducting element.
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; and in the non-charging state, the second switching tube and the third switching tube are both conducted.
Optionally, the method is characterized in that: in the charging state, when the input current is smaller than a first current threshold value, the output end is charged.
Optionally, in the charging state, when the current of the first 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.
The utility model also provides a single live wire charging circuit's control circuit, charging circuit includes first switch tube, first conduction element, first inductance, second switch tube, second conduction element, third switch tube, first input and second input, first input is connected to the first end of first switch tube through the second conduction element, first switch tube, first conduction element, first inductance and second electric capacity constitute BUCK voltage reduction circuit, first input is connected to the reference ground through the second switch tube, the second input is connected to the reference ground through the third switch tube, alternating current input is connected to the first input through load circuit;
when the control circuit receives a signal for indicating that a load circuit is turned off, the control circuit controls the first switch tube, the first conducting element and the first inductor to work in a BUCK voltage reduction mode, and controls the second switch tube and the third switch tube to be turned off;
when the control circuit receives a signal for representing the conduction of the load circuit, 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 drops to the first voltage threshold value, the control circuit returns to the charging state;
the second voltage threshold is greater than the first voltage threshold; the first conduction element and the second conduction element are diodes or switching tubes.
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; and when the charging circuit is in the non-charging state, the control circuit controls the second switching tube and the third switching tube to be conducted.
Optionally, the charging circuit further includes a third conducting element, and the second input terminal is connected to the first terminal of the first switching tube through the third conducting element.
Optionally, the charging circuit further includes a microprocessor, and the microprocessor receives a signal indicating the on or off of the load circuit, converts the signal into a signal indicating the on or off of the load circuit, and sends the signal to the control circuit.
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 a single live wire is simpler, a relay element is omitted, and the range of application of the loaded power is wider. And single live wire charging circuit has the on-state and off-state function of charging, does not need additionally to add off-state charging circuit, can realize system integration, reduces the application 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 flow chart illustrating a method for controlling a single line charging circuit according to an embodiment of the present invention;
fig. 7 is a flow chart illustrating a method for controlling a single line charging circuit according to another embodiment of the present invention;
fig. 8(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. 8(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. 9 is a schematic circuit diagram of the control circuit 100 according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a single-live-wire half-wave power supply circuit according to another embodiment of the present invention;
fig. 11 is a schematic circuit diagram of the control circuit 100 according to another embodiment of the present invention;
fig. 12 is a schematic circuit diagram of a control circuit 100 according to another embodiment of the present invention;
fig. 13 is a schematic diagram of a single live wire full wave power supply circuit according to another embodiment of the present invention.
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 single live wire charging circuit, please refer to fig. 2, the charging circuit includes first switch tube Q01, first conducting element D01, first inductance L01, second switch tube Q02, second conducting element D02, third switch tube Q03, first input L1 and second input L2, the first input L1 is connected to the first end of first switch tube Q01 through the second conducting element D2, the first switch tube Q01, first conducting element D01 and the first inductance L01 constitute the BUCK voltage reduction circuit, the first input L1 is connected to the reference ground through the second switch tube Q02, the second input L2 is connected to the reference ground through the third switch tube Q03, the alternating current input is connected to the first input L1 through the load circuit;
when the load circuit is turned off, the first switch tube Q01, the first conducting element D01 and the first inductor L01 operate in a BUCK mode, and the second switch tube Q02 and the third switch tube Q03 are all turned off;
when the load circuit 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;
the second voltage threshold is greater than the first voltage threshold; the first conduction element and the second conduction element are diodes or switching tubes.
The utility model discloses a scheme makes the application of single live wire simpler, has saved the relay component, and is wideer on taking the scope that load power used. And single live wire charging circuit has the on-state and off-state function of charging, does not need additionally to add off-state charging circuit, can realize system integration, reduces the application volume, and the cost is reduced can realize traditional equipment thing allies oneself with and intelligent control's upgrading.
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 control method of a single-hot-line 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 second switch tube Q02 and the third switch tube Q03 are both turned off, and the first switch tube Q01, the first pass element D01 and the first inductor L01 operate in the BUCK mode.
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 second pass device D02 is determined by the input current, and when the input current is large, the current passing through the second pass device D02 is also large, the loss of the second pass device D02 is large, and heat generation is serious, and in order to reduce the loss of the second 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 third pass device D03, and the second input terminal L2 is connected to the first terminal of the first switch Q01 through the third pass device D03.
Fig. 6 shows a flow chart of a control method of a single live wire charging circuit during full-wave power supply, which 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 second switch tube Q02 and the third switch tube Q03 are both turned off, and the first switch tube Q01, the first pass element D01 and the first inductor L01 operate in the BUCK mode.
Step S103: the first switching tube Q01 is turned on, and the process advances 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. 7 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 second switch tube Q02 and the third switch tube Q03 are both turned off, and the first switch tube Q01, the first pass element D01 and the first inductor L01 operate in the BUCK mode.
Step S103: the first switching tube Q01 is turned on, and the process advances 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. 8(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 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. 8(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 the charging state, the current passing through the second conductive element D02 and the third conductive element D03 is determined by the input current, and when the input current is large, the current passing through the second conductive element D02 and the third conductive element D03 is also large, the loss of the second conductive element D02 and the third conductive element D03 is large, and heat generation is serious, and in order to reduce the loss of the second conductive element and the third conductive element, the output is charged only when the input current is small. Referring to fig. 8(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.
The utility model also provides a single live wire charging circuit's control circuit, please refer to fig. 2, charging circuit includes first switch tube Q01, first conducting element D01, first inductance L01, second switch tube Q02, second conducting element D02, third switch tube Q03, first input L1 and second input L2, first input L1 is connected to the first end of first switch tube Q01 through second conducting element D02, first switch tube Q01, first conducting element D01 and first inductance L01 constitute the BUCK voltage reduction circuit, first input L1 is connected to the ground of reference through said second switch tube Q02, second input L2 is connected to the ground of reference through said third switch tube Q03, the alternating current input is connected to first input L1 through the load circuit;
when the control circuit receives a signal for indicating that a load circuit is turned off, the control circuit controls the first switch tube, the first conducting element and the first inductor to work in a BUCK voltage reduction mode, and controls the second switch tube and the third switch tube to be turned off;
when the control circuit receives a signal for representing the conduction of the load circuit, 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 drops to the first voltage threshold value, the control circuit returns to the charging state;
the second voltage threshold is greater than the first voltage threshold; the first conduction element and the second conduction element are diodes or switching tubes.
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 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 the controller of the third switching tube to make the drain voltage of the third switching tube approach to a third voltage; when the first input end voltage VDP is less than the second input end voltage VDN, 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 drain voltage of the second switching tube approach to the second voltage; in the non-charging state, the control circuit 100 controls both the second transistor Q02 and the third transistor Q03 to be turned on.
In one embodiment, referring to fig. 9, 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 to work in a BUCK voltage reduction mode, and drives the second switching tube and the third switching tube to be turned off. When the logic circuit 103 receives a signal representing the conduction of the load circuit, the voltage feedback circuit 102 compares the voltage of the output end with a first voltage threshold and a second voltage threshold, when the voltage of the output end of the charging circuit relative to the reference ground is lower than the first voltage threshold, the output representing 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, the output representing 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, 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 second pass device D02 is determined by the input current, and when the input current is large, the current passing through the second pass device D02 is also large, the loss of the second pass device D02 is large, and heat generation is serious, and in order to reduce the loss of the second pass device, the output is charged only when the input current is small. Referring to fig. 10, a current detection terminals IS1 and IS2 are added to an embodiment of the single hot line charging circuit. Referring to fig. 11, 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 third pass device D03, and the second input terminal L2 is connected to the first terminal of the first switch Q01 through the third pass device D03.
In one embodiment, as shown in fig. 9, in the block diagram of the control circuit 100, 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 Q03 to make the drain voltage of the third switching tube Q03 approach 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. 12.
In the full-wave power supply, in the charging state, the current passing through the second conducting element D02 and the third conducting element D03 is determined by the input current, and when the input current is large, the current passing through the second conducting element D02 and the third conducting element D03 is also large, the loss of the second conducting element D02 and the third conducting element D03 is large, and heat generation is serious, and in order to reduce the loss of the second conducting element and the third conducting element, the output is charged only when the input current is small. Referring to fig. 12, one embodiment of a single hot charging circuit for full-wave power supply IS shown with current sensing terminals IS1 and IS 2. Fig. 11 is a block diagram of the control circuit 100. The difference between full-wave power supply and half-wave power supply is that when the voltage at the first input end is smaller than that at the second input end, the full-wave power supply circuit can charge the output end, the first current comparison circuit 107 and the second current comparison circuit 109 also need to judge the magnitudes 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 one embodiment, please refer to fig. 2 and fig. 5, 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.
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 (10)
1. A control circuit of a single-live-wire charging circuit comprises a first switch tube, a first conduction element, a first inductor, a second switch tube, a second conduction element, a third switch tube, a first input end and a second input end, wherein the first input end is connected to the first end of the first switch tube through the second conduction element;
when the control circuit receives a signal for indicating that a load circuit is turned off, the control circuit controls the first switch tube, the first conducting element and the first inductor to work in a BUCK voltage reduction mode, and controls the second switch tube and the third switch tube to be turned off;
when the control circuit receives a signal for representing the conduction of the load circuit, 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 drops to the first voltage threshold value, the control circuit returns to the charging state;
the second voltage threshold is greater than the first voltage threshold; the first conduction element and the second conduction element are diodes or switching tubes.
2. The control circuit of the charging circuit according to 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; and when the charging circuit is in the non-charging state, the control circuit controls the second switching tube and the third switching tube to be conducted.
3. The control circuit of the charging circuit according to claim 2, wherein: the control circuit comprises a comparison circuit, a voltage feedback circuit, a logic circuit and a drive circuit,
the voltage feedback circuit receives the output voltage, compares the output voltage with the first voltage threshold and the second voltage threshold, and outputs and represents whether the output end of the voltage feedback circuit is in a charging state;
the logic circuit receives the output voltage of the voltage feedback circuit;
the comparison circuit compares the voltage of the first input end with a first reference voltage, and the output of the comparison circuit represents the voltage of the first input end and the voltage of the second input end; the logic circuit receives the output voltage of the comparison circuit;
the driving circuit receives the output voltage of the logic circuit and drives the first switching tube, the second switching tube and the third switching tube.
4. The control circuit of the charging circuit according to claim 3, wherein: when the logic circuit receives a signal for representing the turn-off of the load circuit, the logic circuit controls the driving circuit to drive the first switching tube to work in a BUCK voltage reduction mode, and drives the second switching tube and the third switching tube to turn off.
5. The control circuit of the charging circuit according to claim 4, wherein: when the logic circuit receives a signal for representing the conduction of the load circuit, the voltage feedback circuit compares the voltage of the output end with a first voltage threshold value and a second voltage threshold value; in the charging state, when the comparator detects that the voltage of the first input end is greater than that of the second input end, the logic circuit controls the driving circuit to drive the second switching tube to be turned off, and drive the third switching tube to be turned off or completely turned on, or the drain voltage of the third switching tube is close to a third voltage by controlling the voltage of a controller of the third switching tube; when the comparator detects that the voltage of the first input end is smaller than that of the second input end, the logic circuit controls the driving circuit to drive the third switching tube to be completely conducted, and drives the second switching tube to be turned 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; and in the non-charging state, the logic circuit controls the driving circuit to drive the second switching tube and the third switching tube to be conducted.
6. The control circuit of the charging circuit according to claim 1, wherein: the charging circuit further comprises a third conducting element, and the second input end is connected to the first end of the first switching tube through the third conducting element.
7. The control circuit of the charging circuit according to claim 6, 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 a second voltage; and when the charging circuit is in the non-charging state, the control circuit controls the second switching tube and the third switching tube to be conducted.
8. The control circuit of the charging circuit according to any one of claims 1 to 7, wherein: in the charging state, when the current of the first switching tube is larger than a first current threshold, the control circuit controls the first switching tube to be turned off, and controls the second switching tube and the third switching tube to be turned on.
9. The control circuit of the charging circuit according to claim 1, wherein: the charging circuit further comprises a microprocessor, wherein the microprocessor receives the signal of the on or off of the load circuit, converts the signal into a signal representing the on or off of the load circuit, and sends the signal to the control circuit.
10. A single live wire charging circuit, its characterized in that: comprising a control circuit according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920511861.4U CN209930023U (en) | 2019-04-16 | 2019-04-16 | Control circuit of single live wire charging circuit and single live wire charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920511861.4U CN209930023U (en) | 2019-04-16 | 2019-04-16 | Control circuit of single live wire charging circuit and single live wire charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209930023U true CN209930023U (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920511861.4U Withdrawn - After Issue CN209930023U (en) | 2019-04-16 | 2019-04-16 | Control circuit of single live wire charging circuit and single live wire charging circuit |
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| Country | Link |
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| CN (1) | CN209930023U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165760A (en) * | 2019-04-16 | 2019-08-23 | 杰华特微电子（杭州）有限公司 | Control method, control circuit and the single firewire charging circuit of single firewire charging circuit |
| CN111162683A (en) * | 2020-01-22 | 2020-05-15 | 上海晶丰明源半导体股份有限公司 | Power conversion circuit and method thereof |
-
2019
- 2019-04-16 CN CN201920511861.4U patent/CN209930023U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110165760A (en) * | 2019-04-16 | 2019-08-23 | 杰华特微电子（杭州）有限公司 | Control method, control circuit and the single firewire charging circuit of single firewire charging circuit |
| CN110165760B (en) * | 2019-04-16 | 2024-06-21 | 杰华特微电子股份有限公司 | Control method of single live wire charging circuit, control circuit and single live wire charging circuit |
| CN111162683A (en) * | 2020-01-22 | 2020-05-15 | 上海晶丰明源半导体股份有限公司 | Power conversion circuit and method thereof |
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