CN214755496U - Current protection control circuit of totem-pole boost converter - Google Patents
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- CN214755496U CN214755496U CN202120981445.8U CN202120981445U CN214755496U CN 214755496 U CN214755496 U CN 214755496U CN 202120981445 U CN202120981445 U CN 202120981445U CN 214755496 U CN214755496 U CN 214755496U
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Abstract
A current protection control circuit of a totem-pole boost converter is applied to the totem-pole boost converter, the totem-pole boost converter comprises a first switch, a second switch, a third switch, a fourth switch and an alternating current power supply, the current protection control circuit of the totem-pole boost converter comprises a current sensing unit and a control module, one end of the current sensing unit is electrically connected with the alternating current power supply, the other end of the current sensing unit is electrically connected with the third switch and the fourth switch, and the current sensing unit senses a current value and generates a current signal; the control module is electrically connected with the current sensing unit, compares stored judgment reference data with the current signal, judges whether the current is abnormal or not, and outputs a protection signal to control the third switch and the fourth switch to be opened when the control module judges that the current is abnormal.
Description
Technical Field
The present invention relates to a protection control circuit, and more particularly to a current protection control circuit for a totem-pole boost converter.
Background
Referring to fig. 9, a Totem Pole Power Factor Correction Converter (TPFC) is one of the most significant converters in terms of Power conversion efficiency performance in the bridgeless pfc Converter, and the structure of the conventional Totem Pole boost Converter 100 includes a first switch Q5, a second switch Q6, a third switch Q7, a fourth switch Q8, a capacitor CI, a resistor RLAn inductor L and an AC power supply 60, the first to fourth switches Q5-Q8 respectively have a first end and a second end, the first end of the second switch Q6 is electrically connected to the second end of the first switch Q5, the first end of the third switch Q7 is electrically connected to the first end of the first switch Q5, the first end of the fourth switch Q8 is electrically connected to the second end of the third switch Q7, the second end of the fourth switch Q8 is electrically connected to the second end of the second switch Q6, the capacitor CI and the resistor R8 are electrically connected to the capacitor CI and the resistor R6LAre connected in parallel, and the capacitor CI and the resistor RLIs electrically connected to the first end of the first switch Q5 and the first end of the third switch Q7, the capacitor CI and the resistor RLThe other end of the inductor L is electrically connected to the second end of the second switch Q6 and the second end of the fourth switch Q8, one end of the ac power source 60 is electrically connected to the second end of the first switch Q5 and the first end of the second switch Q6, the other end of the ac power source is electrically connected to the second end of the third switch Q7 and the first end of the fourth switch Q8, one end of the inductor L is electrically connected to the ac power source 60, and the other end of the inductor L is electrically connected to the second end of the first switch Q5 and the first end of the second switch Q6.
The totem-pole boost converter 100 has a protection control circuit, which includes a control module 40 and a current sensor 50, the control module 40 is electrically connected to the first to fourth switches Q5 to Q8, the control module 40 controls the first to fourth switches Q5 to Q8 to be open or on, and the current sensor 50 is disposed between the inductor L and the ac power supply 60 to sense current information when the inductor L is excited and demagnetized.
Referring to fig. 9 and 10, for example, if the output voltage of the ac power supply 60 is in the positive half cycle, if the second switch Q6 is turned on, the inductor L is excited to store energy, and the control module 40 controls the fourth switch Q8 to be turned on, and the capacitor CI couples the resistor RLIs discharged to pass through the resistor RLOutputting a direct current power supply; when the second switch Q6 is turned off and the first switch Q5 is turned on, the inductor L is demagnetized to charge the capacitor CI together with the AC power source 60 and to charge the resistor RLIs discharged to pass through the resistor RLAnd outputting the direct current power supply.
Referring to fig. 11, however, when the ac power supply 60 has high frequency harmonic components, the voltage waveform of the ac power supply 60 may be changed from positive voltage to negative voltage suddenly when the positive half cycle occurs at a positive half cycle and a negative half cycle, or from negative voltage to positive voltage suddenly when the output voltage at the negative half cycle occurs.
As shown in fig. 12, when the output voltage of the ac power supply 60 is in the positive half cycle, the fourth switch Q8 is kept in the on state, but if the input voltage of the ac power supply 60 is suddenly changed from the positive voltage to the negative voltage due to the influence of the harmonic component, the control module 40 cannot timely control the fourth switch Q8 to be turned off, so that a short-circuit path is formed between the ac power supply 60 and the fourth switch Q8, and since the current sensor 50 is disposed between the inductor L and the ac power supply 60, and the short-circuit path formed between the ac power supply 60 and the fourth switch Q8 does not pass through the inductor L, the current sensor 50 cannot sense the short-circuited current, so that the control module 40 cannot timely sense the large current generated by the short-circuit path through the current sensor 50, and further cause the fourth switch Q8 to be damaged by the excessive current, affecting the operation of the totem-pole boost converter 100.
Similarly, when the output voltage of the ac power supply 60 is in the negative half cycle, the third switch Q7 is maintained in the on state, if the input voltage of the ac power supply 60 suddenly changes from the negative voltage to the positive voltage due to the influence of harmonic components, the control module 40 cannot control the third switch Q7 to open in time, so that a short-circuit path is formed between the ac power supply 60 and the third switch Q7, and since the current sensor 50 is disposed between the inductor L and the ac power supply 60, and the short-circuit path formed between the ac power supply 60 and the third switch Q7 does not pass through the inductor L, so that the current sensor 50 cannot sense the short-circuited current, the control module 40 cannot sense the large current generated by the short-circuit path through the current sensor 50 in time, and further the third switch Q7 is damaged due to the large current.
Therefore, in order to detect the abnormal current and timely control the third switch Q7 and the fourth switch Q8 to open when the totem-pole boost converter 100 is turned on by mistake due to the sudden voltage change of the third switch Q7 and the fourth switch Q8, thereby avoiding the situation that the elements are damaged by the abnormal current, the protection control circuit of the conventional totem-pole boost converter 100 needs to be further improved.
SUMMERY OF THE UTILITY MODEL
In order to achieve the above object, the present invention provides a totem-pole boost converter's current protection control circuit, the supply is used in a totem-pole boost converter, this totem-pole boost converter includes a first switch, a second switch, a third switch, a fourth switch and an ac power supply, this totem-pole boost converter's current protection control circuit includes:
a current sensing unit, one end of which is electrically connected with the alternating current power supply and the other end of which is electrically connected with the connection joint of the third switch and the fourth switch, wherein the current sensing unit is used for sensing a current value and generating a current signal; and
and the control module is electrically connected with the current sensing unit and receives the current signal, compares stored judgment reference data with the current signal to judge whether the current is abnormal or not, and outputs a protection signal to control the third switch and the fourth switch to be opened when the control module judges that the current is abnormal.
The current protection control circuit of the totem-pole boost converter of the utility model arranges the current sensing unit between the AC power supply and the third switch and the fourth switch, when the totem-pole boost converter suddenly converts a positive voltage into a negative voltage in a positive half cycle or suddenly converts a negative voltage into a positive voltage in a negative half cycle due to harmonic components of the AC power source or other disturbance factors, because the current sensing unit is located on the short circuit path generated when the third switch and the fourth switch are conducted by mistake, the control module can perform current abnormality judgment at any time according to the current signal transmitted by the current sensing unit, and the protection signal is used to control the third switch and the fourth switch, so as to improve the problem that in the prior art, when the third switch or the fourth switch is turned on by mistake, the current abnormality cannot be detected in time, so that the abnormal current damages the components inside the totem-pole boost converter.
Drawings
FIG. 1: the utility model discloses the circuit schematic diagram of its first embodiment of totem-pole boost converter's current protection control circuit.
FIG. 2A: the utility model discloses the circuit schematic diagram of its second embodiment of totem-pole boost converter's current protection control circuit.
FIG. 2B: the utility model discloses well protection action unit's circuit schematic diagram.
FIG. 3: the utility model discloses the first electric current flow direction schematic diagram of totem-pole boost converter's current protection control circuit in positive half week.
FIG. 4: the utility model discloses totem pole boost converter's second electric current flow direction schematic diagram of current protection control circuit in positive half week.
FIG. 5: the utility model discloses electric current flow direction schematic diagram when the fourth switch short circuit among totem pole boost converter's the current protection control circuit.
FIG. 6: the utility model discloses totem pole boost converter's current protection control circuit first electric current flow direction schematic diagram when the negative half week.
FIG. 7: the utility model discloses totem pole boost converter's second electric current flow direction schematic diagram of current protection control circuit in the time of negative half week.
FIG. 8: the utility model discloses electric current flow direction schematic diagram when the third switch short circuit among totem pole boost converter's the current protection control circuit.
FIG. 9: the first current flow of the conventional totem-pole boost converter during the positive half cycle is shown in the diagram.
FIG. 10: the second current flow of the conventional totem-pole boost converter during the positive half cycle is shown in the diagram.
FIG. 11: the waveform of the AC power source is shown.
FIG. 12: the current flow of the conventional totem-pole boost converter when the fourth switch is short-circuited is shown in the diagram.
Detailed Description
The following description of the preferred embodiments of the present invention will be made in conjunction with the drawings and the accompanying drawings to further illustrate the technical means adopted to achieve the objects of the present invention.
Referring to fig. 1, in a first embodiment, the current protection control circuit of the Totem-Pole boost Converter of the present invention can be applied to a Totem-Pole boost Converter 1 (TPFC), where the Totem-Pole boost Converter 1 includes a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a capacitor CI, and a resistor RLAn inductor L and an ac power supply 30. The current protection control circuit of the totem-pole boost converter 1 includes a current sensing unit 10 and a control module 20.
The first to fourth switches Q1-Q4 of the totem-pole boost converter 1 respectively have a first end and a second end, the first end of the second switch Q2 is electrically connected to the second end of the first switch Q1, the first end of the third switch Q3 is electrically connected to the first end of the first switch Q1, the first end of the fourth switch Q4 is electrically connected to the second end of the third switch Q3, the second end of the fourth switch Q4 is electrically connected to the second end of the second switch Q2, the capacitor CI and the resistor RLAre connected in parallel, and the capacitor CI and the resistor RLOne end of the first switch Q1 is electrically connected to the connection point of the first end of the third switch Q3, the capacitor CI and the resistor RLThe other end of the second switch Q2 is electrically connected to the connection point of the second end of the fourth switch Q4, and one end of the ac power source 30 is electrically connected to the second end of the first switch Q1 and the second switch Q2The other end of the inductor L is electrically connected between the ac power source 30 and the first switch Q1 and the second switch Q2, wherein one end of the inductor L is electrically connected to the ac power source 30, and the other end of the inductor L is electrically connected to the second end of the first switch Q1 and the connection point of the first end of the second switch Q2.
In this embodiment, the first to fourth switches Q1-Q4 may be Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), each of which has a capacitor CI connected in parallel with a drain and a source, the drain of the second switch Q2 is electrically connected to the source of the first switch Q1, the drain of the third switch Q3 is electrically connected to the drain of the first switch Q1, the drain of the fourth switch Q4 is electrically connected to the source of the third switch Q3, the source of the fourth switch Q4 is electrically connected to the source of the second switch Q2, the capacitor CI and the resistor RLOne end of the first switch is electrically connected to the drain of the first switch Q1 and the drain of the third switch Q3, the capacitor CI and the resistor RLThe other end of the first diode is electrically connected to the source of the second switch Q2 and the source of the fourth switch Q4, one end of the ac power supply 30 is electrically connected to the source of the first switch Q1 and the drain of the second switch Q2, the other end of the ac power supply 30 is electrically connected to the source of the third switch Q3 and the drain of the fourth switch Q4, one end of the inductor L is electrically connected to the ac power supply 30, the other end of the inductor L is electrically connected to the source of the first switch Q1 and the drain of the second switch Q2, the totem-pole boost converter 1 may include a first diode D1 and a second diode D2, the input end of the first diode D1 is electrically connected to the ac power supply 30 and the inductor L, the output end of the first diode D1 is electrically connected to the drain of the first switch Q1 and the drain of the first switch Q3, the input end of the second diode D2 is electrically connected to the source of the second switch Q2 and the source of the fourth switch Q4, the output end of the first diode D92 is electrically connected to the output end of the second diode D638, The ac power supply 30 and the inductor L.
The Current sensing unit 10 is disposed between the ac power supply 30, the third switch Q3 and the fourth switch Q4, one end of the Current sensing unit 10 is electrically connected to the ac power supply 30, the other end of the Current sensing unit is electrically connected to a connection node between the source of the third switch Q3 and the drain of the fourth switch Q4, the Current sensing unit 10 is configured to sense a Current value to generate a Current signal, wherein the Current sensing unit 10 may be a Current sensing device such as a Current Transformer (CT).
The control module 20 is electrically connected to the current sensing unit 10 to receive a current signal transmitted by the current sensing unit 10, the control module 20 can be electrically connected to the gates of the first to fourth switches Q1-Q4 to control the on/off of the first to fourth switches Q1-Q4, the control module 20 can store an adjustable judgment reference data, and the control module 20 compares the current signal with the judgment reference data to perform current abnormality judgment, in this embodiment, the determination reference data includes a current threshold, and when the control module 20 determines that the current value corresponding to the current signal is greater than the current threshold, that is, the control module 20 determines that the current is abnormal, and the control module 20 outputs a protection signal to control the third switch Q3 and the fourth switch Q4 to open the circuit, wherein the control module 20 may be a microcontroller.
Referring to fig. 2A, in the second embodiment, the control module 20 may include a current-voltage converting unit 21, a trigger signal unit 22 and a control unit 23, and the determination reference data of the control module 20 includes a first voltage threshold S1 and a second voltage threshold S2. The current-voltage converting unit 21 is electrically connected to the current sensing unit 10, and is configured to receive the current signal transmitted by the current sensing unit 10, and convert the current signal into a corresponding voltage signal for output, where the current-voltage converting unit 21 may be a resistor.
The trigger signal unit 22 includes a first comparator 221 and a second comparator 222, the first comparator 221 and the second comparator 222 are electrically connected to the current-voltage conversion unit 21, the first comparator 221 is internally preset with the adjustable first voltage threshold S1, the second comparator 222 is internally preset with the adjustable second voltage threshold S2, when the first comparator 221 determines that a voltage value corresponding to the voltage signal is greater than the first voltage threshold S1, the first comparator 221 outputs a first trigger signal, and when the second comparator 222 determines that the voltage value corresponding to the voltage signal is less than the second voltage threshold S2, the second comparator 222 outputs a second trigger signal. It should be noted that, in the embodiment, the first comparator 221 determines whether the voltage value is greater than the first voltage threshold S1 when the output voltage of the ac power supply 30 is in the positive half cycle, and senses the abnormal current when the voltage value is greater than the first voltage threshold S1, which represents that the ac power supply 30 is in the positive half cycle, and the second comparator 222 determines whether the voltage value is less than the second voltage threshold S2 when the output voltage of the ac power supply 30 is in the negative half cycle, and senses the abnormal current when the voltage value is less than the second voltage threshold S2, which represents that the ac power supply 30 is in the negative half cycle, but the first comparator 221 may also determine the abnormal current when the ac power supply 30 is in the negative half cycle, and the second comparator 222 determines the abnormal current when the ac power supply 30 is in the positive half cycle, which is not limited by the embodiment.
The control unit 23 is electrically connected to the output end of the trigger signal unit 22, and the control unit 23 is electrically connected to the gates of the first to fourth switches Q1 to Q4 to control the on/off of the first to fourth switches Q1 to Q4, when the control unit 23 receives the first trigger signal or the second trigger signal, the control unit 23 generates the protection signal to control the third switch Q3 and the fourth switch Q4 to be turned off, so as to prevent the abnormal current from continuously flowing through the third switch Q3 or the fourth switch Q4, which may cause the third switch Q3 or the fourth switch Q4 to be damaged, wherein the control unit 23 may be a microcontroller, for example, the control unit 23 may be a microcontroller of the type UCD 3138.
In a preferred embodiment, a protection operation unit 24 is disposed between the trigger signal unit 22 and the control unit 23, the protection operation unit 24 is electrically connected to the output ends of the first comparator 221 and the second comparator 222, when the protection operation unit 24 receives the first trigger signal transmitted by the first comparator 221 and/or the second trigger signal transmitted by the second comparator 222, the protection operation unit 24 outputs a protection operation signal, so that the control unit 23 can determine that the trigger signal unit 22 generates the first trigger signal or the second trigger signal according to the protection operation signal.
Referring to fig. 2B, wherein the protection operation unit 24 may be a logic circuit, in this embodiment, the protection operation unit 24 may include an or gate 241 and a Bipolar Junction Transistor 242 (BJT), an input terminal of the or gate 241 is connected to the output terminal of the first comparator 221 and the output terminal of the second comparator 222, a base of the Bipolar Junction Transistor 242 is connected to the output terminal of the or gate 241, a collector of the Bipolar Junction Transistor 242 is connected to an Enable pin (Enable) of the control unit 23, wherein when the first comparator 221 determines that a voltage value corresponding to the voltage signal is greater than the first voltage threshold S1, the first comparator 221 outputs the first trigger signal with a high level, and when the second comparator 222 determines that the voltage value corresponding to the voltage signal is less than the second voltage threshold S2, the second comparator 222 outputs the second trigger signal with a high level, when the or gate 241 receives the first trigger signal with high level and/or the second trigger signal with high level, the or gate 241 outputs a high level signal to drive the bjt 242, the bjt 242 pulls the enable pin of the control unit 23 to ground level, so that the control unit 20 23 controls the third switch Q3 and the fourth switch Q4 to stop operating, i.e., controls the third switch Q3 and the fourth switch Q4 to open.
When the control unit 23 receives the protection operation signal transmitted by the protection operation unit 24, the protection signal is generated according to the protection operation signal to control the third switch Q3 and the fourth switch Q4 to be turned off, so as to prevent abnormal current from continuously flowing through the third switch Q3 or the fourth switch Q4, which may damage the third switch Q3 or the fourth switch Q4.
Referring to fig. 3 and 4, the operation flow of the current protection control circuit of the totem-pole boost converter 1 of the present invention will be described in detail below by taking the case where the input voltage of the ac power supply 30 is in the positive half cycle as an example. When the input voltage of the AC power supply 30 is atIn the positive half cycle, if the second switch Q2 is turned on, the inductor L is excited to store energy, and at this time, the control module 20 of the first embodiment or the control unit 23 of the second embodiment controls the fourth switch Q4 to be turned on until the input voltage of the ac power supply 30 is converted from the positive half cycle to the negative half cycle, and the capacitor CI couples to the resistor RLIs discharged to pass through the resistor RLOutputting a direct current power supply; if the second switch Q2 is turned off and the first switch Q1 is turned on, since the input voltage of the ac power supply 30 is still at the positive half cycle, the control module 20 of the first embodiment or the control unit 23 of the second embodiment controls the fourth switch Q4 to be turned on, and the inductor L is demagnetized to charge the capacitor CI together with the ac power supply 30 and to charge the resistor RLIs discharged to pass through the resistor RLAnd outputting the direct current power supply.
Referring to fig. 5, when the ac power supply 30 has high harmonic components, the voltage waveform of the ac power supply 30 may suddenly change from positive voltage to negative voltage when the positive half cycle occurs at the switching position of the positive half cycle and the negative half cycle, if the input voltage of the ac power supply 30 suddenly changes from positive voltage to negative voltage due to the influence of the harmonic components, the control module 20 of the first embodiment or the control unit 23 of the second embodiment cannot timely control the fourth switch Q4 to open the circuit, so that a short-circuit path is formed between the ac power supply 30 and the fourth switch Q4, the current sensing unit 10 is disposed between the ac power supply 30 and the fourth switch Q4, and the current sensing unit 10 can detect the current value on the short-circuit path.
Referring to fig. 6 and 7, the operation flow of the current protection control circuit of the totem-pole boost converter 1 of the present invention will be described in detail below by taking the negative half cycle of the input voltage of the ac power supply 30 as an example. When the input voltage of the ac power supply 30 is in the negative half cycle, if the first switch Q1 is turned on, the inductor L is excited to store energy, and at this time, the control module 20 of the first embodiment or the control unit 23 of the second embodiment controls the third switch Q3 to be turned on until the input voltage of the ac power supply 30 is converted from the negative half cycle to the positive half cycle, and the capacitor CI couples the resistor RLIs discharged to pass through the resistor RLOutputting a direct current power supply; if the first switch Q1 is turned off and the second switch Q2 is turned on, since the input voltage of the ac power supply 30 is still in the negative half cycle, the control module 20 of the first embodiment or the control unit 23 of the second embodiment controls the third switch Q3 to be turned on, and the inductor L is demagnetized to charge the capacitor CI together with the ac power supply 30 and to charge the resistor RLIs discharged to pass through the resistor RLAnd outputting the direct current power supply.
Referring to fig. 8, when the ac power supply 30 has high harmonic components, the voltage waveform of the ac power supply 30 may suddenly change from negative voltage to positive voltage when the positive half cycle occurs at the switching position of the positive half cycle and the negative half cycle, if the input voltage of the ac power supply 30 suddenly changes from negative voltage to positive voltage due to the influence of the harmonic components, the control module 20 of the first embodiment or the control unit 23 of the second embodiment cannot timely control the third switch Q3 to open the circuit, so that a short-circuit path is formed between the ac power supply 30 and the third switch Q3, the current sensing unit 10 is disposed between the ac power supply 30 and the third switch Q3, and the current sensing unit 10 can detect the current value on the short-circuit path.
In the first embodiment, when a short circuit occurs, the current sensing unit 10 can transmit the current signal to the control module 20 according to the current value, the control module 20 determines whether the current value corresponding to the current signal is greater than the current threshold value to determine whether the current is abnormal, and when the current value corresponding to the current signal is greater than the current threshold value, the control module 20 outputs the protection signal to control the third switch Q3 and the fourth switch Q4 to open the circuit in real time, so as to prevent the element inside the totem pole boost converter 1 from being damaged due to an excessive current.
In the second embodiment, when a short circuit occurs, the trigger unit compares the voltage signal corresponding to the current signal with the first voltage threshold S1 and the second voltage threshold S2 respectively to determine whether the current is abnormal, and when the voltage value corresponding to the voltage signal is greater than the first voltage threshold S1 or less than the second voltage threshold S2, the protection unit 24 generates the protection signal, and the control unit 23 controls the third switch Q3 and the fourth switch Q4 to open in real time according to the protection signal.
To sum up, in the current protection control circuit of the totem-pole boost converter 1 of the present invention, the current sensing unit 10 is disposed between the ac power supply 30 and the third switch Q3 and the fourth switch Q4, when the totem-pole boost converter 1 suddenly converts the positive voltage into the negative voltage in the positive half cycle or suddenly converts the negative voltage into the positive voltage in the negative half cycle due to the harmonic component or other disturbance factors of the ac power supply 30, and the control module 20 or the control unit 23 cannot instantly control the third switch Q3 or the fourth switch Q4 to open or close, so that when the third switch Q3 or the fourth switch Q4 is turned on by mistake, because the current sensing unit 10 is located on the short-circuit path generated when the third switch Q3 and the fourth switch Q4 are turned on by mistake, the control module 20 can perform current abnormality judgment at any time according to the current signal transmitted by the current sensing unit 10, when the control module 20 determines that the current is abnormal, the control module 20 outputs the protection signal to control the third switch Q3 and the fourth switch Q4 to open, so as to prevent the abnormal current from damaging the components inside the totem-pole boost converter 1.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, but not to limit the present invention, any person skilled in the art can make modifications or changes to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical spirit of the present invention still fall within the scope of the present invention.
Claims (8)
1. A current protection control circuit of a totem-pole boost converter is applied to the totem-pole boost converter, and is characterized in that the totem-pole boost converter comprises a first switch, a second switch, a third switch, a fourth switch and an alternating current power supply, and the current protection control circuit of the totem-pole boost converter comprises:
a current sensing unit, one end of which is electrically connected with the alternating current power supply and the other end of which is electrically connected with the connection joint of the third switch and the fourth switch, wherein the current sensing unit is used for sensing a current value and generating a current signal; and
and the control module is electrically connected with the current sensing unit and receives the current signal, compares stored judgment reference data with the current signal to judge whether the current is abnormal or not, and outputs a protection signal to control the third switch and the fourth switch to be opened when the control module judges that the current is abnormal.
2. The circuit of claim 1, wherein the first switch to the fourth switch are respectively a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a drain of the second switch is electrically connected to a source of the first switch, a drain of the third switch is electrically connected to a drain of the first switch, a drain of the fourth switch is electrically connected to a source of the third switch, a source of the fourth switch is electrically connected to a source of the second switch, one end of the ac power source is electrically connected to the source of the first switch and the drain of the second switch, and the other end of the ac power source is electrically connected to the source of the third switch and the drain of the fourth switch via the current sensing unit.
3. The circuit of claim 1, wherein the control module controls the first switch to the fourth switch to be turned on or off by electrically connecting the first switch to a gate of the fourth switch.
4. The circuit of claim 1, wherein the totem-pole boost converter comprises an inductor, a capacitor and a resistor, one end of the inductor is electrically connected to the ac power source, the other end of the inductor is electrically connected to the connection point of the first switch and the second switch, the capacitor and the resistor are connected in parallel, one end of the capacitor and the resistor is electrically connected to the connection point of the first switch and the third switch, and the other end of the capacitor and the resistor is electrically connected to the connection point of the second switch and the fourth switch.
5. The circuit of claim 1, wherein the reference data comprises a current threshold, and the control module outputs the protection signal when the control module determines that the current value corresponding to the current signal is greater than the current threshold.
6. The circuit of claim 1, wherein the control module comprises a current-to-voltage conversion unit, a trigger signal unit and a control unit, and the determination reference data of the control module comprises a first voltage threshold and a second voltage threshold;
the current-voltage conversion unit is electrically connected with the current sensing unit and converts the current signal transmitted by the current sensing unit into a corresponding voltage signal for output;
the trigger signal unit comprises a first comparator and a second comparator, the first comparator and the second comparator are respectively electrically connected with the current-voltage conversion unit, the first comparator is provided with the first voltage threshold by default, the second comparator is provided with the second voltage threshold by default, when the first comparator judges that a voltage value corresponding to the voltage signal is greater than the first voltage threshold, the first comparator outputs a first trigger signal, and when the second comparator judges that the voltage value corresponding to the voltage signal is less than the second voltage threshold, the second comparator outputs a second trigger signal;
the control unit is electrically connected with the output end of the trigger signal unit, and when the control unit receives the first trigger signal or the second trigger signal, the control unit generates the protection signal to control the third switch and the fourth switch to be switched off.
7. The circuit of claim 6, wherein a protection unit is electrically connected between the trigger signal unit and the control unit, and outputs a protection signal when the protection unit receives the first trigger signal transmitted by the first comparator or the second trigger signal transmitted by the second comparator;
when the control unit generates the protection signal according to the protection action signal.
8. The circuit of claim 1, wherein the control module controls the fourth switch to conduct when the input voltage of the ac power source is at a positive half cycle;
when the input voltage of the alternating current power supply is in the negative half cycle, the control module controls the third switch to be conducted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120981445.8U CN214755496U (en) | 2021-05-10 | 2021-05-10 | Current protection control circuit of totem-pole boost converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120981445.8U CN214755496U (en) | 2021-05-10 | 2021-05-10 | Current protection control circuit of totem-pole boost converter |
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| CN214755496U true CN214755496U (en) | 2021-11-16 |
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2021
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