CN212992222U - Voltage-multiplying rectification and full-wave rectification automatic switching circuit and switching power supply - Google Patents
Voltage-multiplying rectification and full-wave rectification automatic switching circuit and switching power supply Download PDFInfo
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- CN212992222U CN212992222U CN202022319167.8U CN202022319167U CN212992222U CN 212992222 U CN212992222 U CN 212992222U CN 202022319167 U CN202022319167 U CN 202022319167U CN 212992222 U CN212992222 U CN 212992222U
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Abstract
The utility model discloses a voltage doubling rectification and full wave rectification automatic switch-over circuit and switching power supply. Wherein, voltage doubler rectification and full-wave rectification automatic switching circuit include: the switch driving module is used for driving the switch module according to the instruction of the control unit; the switch module is used for realizing the switching of voltage doubling rectification and full-wave finishing by switching on and off the switch; the rectifying module is used for converting the switching module into a corresponding voltage-multiplying rectifying state or a corresponding full-wave rectifying state according to the on-off state of the switching module; and the filtering module is used for filtering and absorbing current fluctuation generated in the working process of the voltage-multiplying rectification and full-wave rectification automatic switching circuit and interference in series connection through an alternating current power supply. Adopt the utility model discloses not only can reduce switch malfunction or damage, the circuit that causes damages, simplifies circuit design, has still reduced control consumption, extension circuit life.
Description
Technical Field
The utility model relates to a power electronic technology field, in particular to voltage doubling rectification and full wave rectification automatic switching circuit and switching power supply.
Background
In the prior art, an ac-to-dc switching power supply usually obtains a dc high voltage through high-voltage rectification and filtering, and supplies a dc-to-dc converter to obtain one or more stable dc voltages at an output end, and the power is available from several watts to several kilowatts, and is used in different occasions.
The alternating current to direct current switching power supply generally rectifies input commercial power, and then converts the rectified commercial power into required direct current voltage through a primary direct current to direct current converter.
However, in order to meet the general requirements of domestic and foreign markets, when the input range is wide, such as 90V to 264V, if only full-wave rectification is adopted, the direct-current voltage range obtained after rectification is 110V to 380V. Such a large input range makes the dc-dc converter difficult to design. In order to solve the problem, a method of inputting 110Vac rated double-voltage rectification and a method of inputting 220Vac rated full-wave rectification are adopted. In this way, the rectified voltage range can be greatly reduced.
In the design process of the switching circuit for realizing voltage-doubling rectification and full-wave rectification, the inventor finds that the prior art has at least the following problems:
1. a manual mode; and manually switching the rectification mode according to the system of the local power grid voltage. The adoption of the rectification switching mode is easy to make mistakes, and once the power supply is made mistakes, the power supply is easy to damage.
2. The relay automatically switches the mode; the switching is automatically carried out by a relay according to the local power grid voltage. The automatic switching mode of the relay is adopted, and the service life of the relay is limited, so that if the relay is in misoperation or damage, the circuit is damaged; in addition, the relay needs independent power supply and logic control, so that the relay cannot share a power supply with the main output of the power supply, cannot be monitored by a main control part of the power supply, and has complex circuit design.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made to provide a voltage doubler rectification and full-wave rectification automatic switching circuit and a switching power supply that overcome or at least partially solve the above problems.
According to an aspect of the present invention, the present invention provides an automatic switching circuit for voltage doubling rectification and full wave rectification; the circuit includes: the device comprises a switch driving module, a switch module, a rectifying module and a filtering module;
the switch driving module is used for driving the switch module according to the instruction of the control unit;
the switch module is used for realizing the switching of voltage doubling rectification and full wave finishing by switching on and off the switch;
the rectifying module is used for converting the switching module into a corresponding voltage-multiplying rectifying state or a corresponding full-wave rectifying state according to the on or off state of the switching module;
and the filtering module is used for filtering and absorbing current fluctuation generated in the working process of the voltage-multiplying rectification and full-wave rectification automatic switching circuit and interference in series connection through an alternating current power supply.
Wherein the switch driving module includes: the first optical coupler and the driving resistor;
the first optical coupler anode is connected with the driving pin of the control unit, the first optical coupler cathode is grounded, the first optical coupler emitting electrode is connected with the switch module, and the first optical coupler collecting electrode is connected with one end of the driving resistor;
the other end of the driving resistor is connected with a direct current power supply.
Wherein the switch module comprises: the first switch tube, the second switch tube and the voltage stabilizing diode;
the drain electrode of the first switching tube is connected with a zero line of an alternating current power supply, the source electrode of the first switching tube is connected with the source electrode of the second switching tube, and the grid electrode of the first switching tube is connected with the grid electrode of the second switching tube;
the drain electrode of the second switching tube is connected with the filtering module;
the cathode of the voltage stabilizing diode is connected with the grid electrode connecting end of the first switching tube and the grid electrode connecting end of the second switching tube;
the anode of the voltage stabilizing diode is connected with the connection end of the source electrode of the first switching tube and the source electrode of the second switching tube
Wherein, the rectifier module includes: a first diode, a second diode, a third diode and a fourth diode;
the anode of the first diode is respectively connected with a live wire of an alternating current power supply, and the cathode of the second diode is connected with the anode of the first diode;
the cathode of the first diode is connected with the direct current power supply;
the anode of the second diode is connected with the anode of the fourth diode and the connecting end of the filtering module;
the cathode of the third diode is connected with the direct current power supply;
and the anode of the third diode is connected with the cathode of the fourth diode.
Wherein the filtering module comprises: a first filter capacitor and a second filter capacitor;
one end of the first filter capacitor is connected with the direct-current power supply, and the other end of the first filter capacitor is connected with the drain electrode of the second switching tube and the connecting end of the second filter capacitor;
the other end of the second filter capacitor is connected with the anode connecting end of the second diode and the anode connecting end of the fourth diode.
According to another aspect of the present invention, the present invention provides a switching power supply; the power supply includes: the voltage-multiplying rectification and full-wave rectification automatic switching circuit; the circuit includes: the device comprises a switch driving module, a switch module, a rectifying module and a filtering module;
the switch driving module is used for driving the switch module according to the instruction of the control unit;
the switch module is used for realizing the switching of voltage doubling rectification and full wave finishing by switching on and off the switch;
the rectifying module is used for converting the switching module into a corresponding voltage-multiplying rectifying state or a corresponding full-wave rectifying state according to the on or off state of the switching module;
and the filtering module is used for filtering and absorbing current fluctuation generated in the working process of the voltage-multiplying rectification and full-wave rectification automatic switching circuit and interference in series connection through an alternating current power supply.
Wherein the switch driving module includes: the first optical coupler and the driving resistor;
the first optical coupler anode is connected with the driving pin of the control unit, the first optical coupler cathode is grounded, the first optical coupler emitting electrode is connected with the switch module, and the first optical coupler collecting electrode is connected with one end of the driving resistor;
the other end of the driving resistor is connected with a direct current power supply.
Wherein the switch module comprises: the first switch tube, the second switch tube and the voltage stabilizing diode;
the drain electrode of the first switching tube is connected with a zero line of an alternating current power supply, the source electrode of the first switching tube is connected with the source electrode of the second switching tube, and the grid electrode of the first switching tube is connected with the grid electrode of the second switching tube;
the drain electrode of the second switching tube is connected with the filtering module;
the cathode of the voltage stabilizing diode is connected with the grid electrode connecting end of the first switching tube and the grid electrode connecting end of the second switching tube;
and the anode of the voltage stabilizing diode is connected with the connection end of the source electrode of the first switching tube and the source electrode of the second switching tube.
Wherein, the rectifier module includes: a first diode, a second diode, a third diode and a fourth diode;
the anode of the first diode is respectively connected with a live wire of an alternating current power supply, and the cathode of the second diode is connected with the anode of the first diode;
the cathode of the first diode is connected with the direct current power supply;
the anode of the second diode is connected with the anode of the fourth diode and the connecting end of the filtering module;
the cathode of the third diode is connected with the direct current power supply;
and the anode of the third diode is connected with the cathode of the fourth diode.
Wherein the filtering module comprises: a first filter capacitor and a second filter capacitor;
one end of the first filter capacitor is connected with the direct-current power supply, and the other end of the first filter capacitor is connected with the drain electrode of the second switching tube and the connecting end of the second filter capacitor;
the other end of the second filter capacitor is connected with the anode connecting end of the second diode and the anode connecting end of the fourth diode.
The utility model has the advantages that: through the utility model discloses in the switch module's that adopts switch closure and disconnection, realize the switching of voltage doubling rectification and full wave arrangement to the circuit design who not only simplifies reduces switch malfunction or damage, and the circuit that causes damages, has still reduced control consumption, extension circuit life.
Drawings
Fig. 1 is a schematic structural diagram of an automatic switching circuit for voltage-doubling rectification and full-wave rectification provided by the present invention;
fig. 2 is a circuit diagram of the present invention for automatically switching between voltage doubling rectification and full-wave rectification;
fig. 3 is a schematic structural diagram of a switching power supply provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The utility model provides a voltage doubling rectification and full wave rectification automatic switching circuit, as shown in fig. 1, the utility model provides a pair of voltage doubling rectification and full wave rectification automatic switching circuit includes: a switch driving module 101, a switch module 102, a rectifying module 103 and a filtering module 104;
the switch driving module 101 is configured to drive the switch module according to an instruction of the control unit;
the switch module 102 is configured to switch between voltage-doubling rectification and full-wave rectification by switching on and off the switch;
the rectifying module 103 is configured to convert the switching module into a corresponding voltage-doubling rectifying state or a corresponding full-wave rectifying state according to the on or off state of the switching module;
the filtering module 104 is configured to filter and absorb current fluctuation generated during the operation of the voltage-doubling rectification and full-wave rectification automatic switching circuit and interference from an ac power supply in series.
Based on above embodiment, the utility model provides a voltage doubler rectification and full wave rectification automatic switching circuit is still provided, as shown in fig. 2, voltage doubler rectification and full wave rectification automatic switching circuit include: the device comprises a switch driving module, a switch module, a rectifying module and a filtering module; wherein the switch driving module includes: a first optical coupler O1 and a driving resistor R; the switch module includes: a first switching tube M1, a second switching tube M2 and a zener diode Z1; the rectification module includes: a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; the filtering module includes: a first filter capacitor C1 and a second filter capacitor C2;
the anode of the first optical coupler O1 is connected with the drive pin drive of the control unit, the cathode of the first optical coupler O1 is grounded, the emitter of the first optical coupler O1 is connected with the cathode of a voltage stabilizing diode Z1 of the switch module, and the collector of the first optical coupler O1 is connected with one end of the drive resistor R;
the other end of the driving resistor R is connected with a direct current power supply vdc +.
The drain of the first switching tube M1 is connected with a zero line N of an alternating current power supply, the source s1 of the first switching tube M1 is connected with the source s2 of the second switching tube M2, and the grid g1 of the first switching tube M1 is connected with the grid g2 of the second switching tube M2;
the drain d2 of the second switch tube M2 is connected with the connection end of the first filter capacitor C1 and the second filter capacitor C2 of the filter module;
the cathode of the zener diode Z1 is connected to the connection end of the grid g1 of the first switch tube M1 and the grid g2 of the second switch tube M2;
the anode of the zener diode Z1 is connected to the connection end of the source s1 of the first switching tube M1 and the source s2 of the second switching tube M2.
The anodes of the first diodes D1 are respectively connected with a live wire L of an alternating current power supply, and the cathodes of the second diodes D2 are connected;
the cathode of the first diode D1 is connected with the direct current power source vdc +;
the anode of the second diode D2 is connected with the anode of the fourth diode D4 and the connection end of the second filter capacitor C2 of the filter module;
the cathode of the third diode D3 is connected with the direct current power source vdc +;
the anode of the third diode D3 is connected to the cathode of the fourth diode D4.
One end of the first filter capacitor C1 is connected with the direct current power source vdc +, and the other end is connected with the connection end of the drain of the second switch tube D2 and the second filter capacitor C2;
the other end of the second filter capacitor C2 is connected to the anode connection end of the second diode D2 and the anode connection end of the fourth diode D4.
Based on the above circuit, the circuit is analyzed by the following specific implementation principle of the circuit, specifically as follows:
the technical proposal of the utility model is that an electronic switch is composed of two switch tubes M1 and M2; the switch tube may be a Metal-Oxide-semiconductor field-Effect Transistor (MOSFET). The control unit controls the first optical coupler O1 to drive the electronic switch to be switched on and off, so that the rectification module is controlled to switch the rectification mode. As shown in fig. 2, after power-on, the control unit MCU detects the utility power AC, if the utility power AC is detected to be lower than a certain threshold, the control unit MCU drives the pin drive to turn on the first optical coupler O1, the bus voltage limits the driving current of the driving MOS transistor through the driving resistor R, the first optical coupler O1 pushes the first switch tube M1, the second switch tube M2 is turned on, and the zener diode Z1 plays a role in limiting the driving voltage of the first switch tube M1 and the second switch tube M2. The neutral line N is short-circuited with the middle points of the filter capacitors C1 and C2, and the circuit works in a voltage-multiplying rectification state. If the commercial power is higher than a certain threshold value, the control unit drives the pin drive to be turned off, the first optical coupler O1, the first switch tube M1 and the second switch tube M2 are cut off, the zero line N line is disconnected with the filter capacitors C1 and C2, and the commercial power is changed into full-wave rectification through the diodes D1-D4. Thereby completing the switching from full-wave rectification to voltage-doubler rectification.
Full-wave rectification work: when an electronic switch consisting of a first switch tube M1 and a second switch tube M2 is turned off, the circuit works in a full-wave rectification mode, when the L potential is higher than the N-point potential, a first diode D1 and a fourth diode D4 are conducted, and current flows through an alternating current live wire L, a first diode D1, a first filter capacitor C1, a second filter capacitor C2, a fourth diode D4 and an alternating current zero line N; when the potential of the alternating current zero line N is higher than the potential of an alternating current live line L, the second diode D2 and the third diode D3 are conducted, and current flows through the alternating current zero line N, the third diode D3, the first filter capacitor C1, the second filter capacitor C2, the second diode D2 and the alternating current live line L; if the input AC voltage is sinusoidal, then the highest voltage Vdc may be the peak value of the input AC voltage.
Voltage doubling rectification work: when the electronic switch composed of M1 and M2 is turned on, the circuit works in a voltage-doubling rectification mode: when the potential L is higher than the potential N, the first diode D1 is conducted, and the current flows through the alternating current live wire L, the first diode D1, the first filter capacitor C1, the second switch tube M2, the first switch tube M1 and the alternating current zero line N; when the potential of the alternating current zero line N is higher than the potential of an alternating current live line L, the second diode D2 is conducted, and current flows through the alternating current zero line N, the first switch tube M1, the second switch tube M2, the second filtering ground capacitor C2, the second diode D2 and the alternating current live line L; if the input ac voltage is sinusoidal, then Vdc maximum voltage may be twice the peak value of the input ac voltage.
As shown in fig. 3, it is a schematic structural diagram of a switching power supply provided by the present invention; the utility model provides a switching power supply includes: the voltage-multiplying rectification and full-wave rectification automatic switching circuit; the circuit includes: the device comprises a switch driving module, a switch module, a rectifying module and a filtering module;
the switch driving module is used for driving the switch module according to the instruction of the control unit;
the switch module is used for realizing the switching of voltage doubling rectification and full wave finishing by switching on and off the switch;
the rectifying module is used for converting the switching module into a corresponding voltage-multiplying rectifying state or a corresponding full-wave rectifying state according to the on or off state of the switching module;
and the filtering module is used for filtering and absorbing current fluctuation generated in the working process of the voltage-multiplying rectification and full-wave rectification automatic switching circuit and interference in series connection through an alternating current power supply.
Wherein the switch driving module includes: the first optical coupler and the driving resistor;
the first optical coupler anode is connected with the driving pin of the control unit, the first optical coupler cathode is grounded, the first optical coupler emitting electrode is connected with the switch module, and the first optical coupler collecting electrode is connected with one end of the driving resistor;
the other end of the driving resistor is connected with a direct current power supply.
Wherein the switch module comprises: the first switch tube, the second switch tube and the voltage stabilizing diode;
the drain electrode of the first switching tube is connected with a zero line of an alternating current power supply, the source electrode of the first switching tube is connected with the source electrode of the second switching tube, and the grid electrode of the first switching tube is connected with the grid electrode of the second switching tube;
the drain electrode of the second switching tube is connected with the filtering module;
the cathode of the voltage stabilizing diode is connected with the grid electrode connecting end of the first switching tube and the grid electrode connecting end of the second switching tube;
and the anode of the voltage stabilizing diode is connected with the connection end of the source electrode of the first switching tube and the source electrode of the second switching tube.
Wherein, the rectifier module includes: a first diode, a second diode, a third diode and a fourth diode;
the anode of the first diode is respectively connected with a live wire of an alternating current power supply, and the cathode of the second diode is connected with the anode of the first diode;
the cathode of the first diode is connected with the direct current power supply;
the anode of the second diode is connected with the anode of the fourth diode and the connecting end of the filtering module;
the cathode of the third diode is connected with the direct current power supply;
and the anode of the third diode is connected with the cathode of the fourth diode.
Wherein the filtering module comprises: a first filter capacitor and a second filter capacitor;
one end of the first filter capacitor is connected with the direct-current power supply, and the other end of the first filter capacitor is connected with the drain electrode of the second switching tube and the connecting end of the second filter capacitor;
the other end of the second filter capacitor is connected with the anode connecting end of the second diode and the anode connecting end of the fourth diode.
The utility model has the advantages that: through the utility model discloses in the switch module's that adopts switch closure and disconnection, realize the switching of voltage doubling rectification and full wave arrangement to the circuit design who not only simplifies reduces switch malfunction or damage, and the circuit that causes damages, has still reduced control consumption, extension circuit life.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. An automatic switching circuit for voltage doubling rectification and full wave rectification, comprising: the device comprises a switch driving module, a switch module, a rectifying module and a filtering module;
the switch driving module is used for driving the switch module according to the instruction of the control unit;
the switch module is used for realizing the switching of voltage doubling rectification and full wave finishing by switching on and off the switch;
the rectifying module is used for converting the switching module into a corresponding voltage-multiplying rectifying state or a corresponding full-wave rectifying state according to the on or off state of the switching module;
and the filtering module is used for filtering and absorbing current fluctuation generated in the working process of the voltage-multiplying rectification and full-wave rectification automatic switching circuit and interference in series connection through an alternating current power supply.
2. The voltage doubler rectification and full-wave rectification automatic switching circuit according to claim 1, wherein the switch driving module comprises: the first optical coupler and the driving resistor;
the first optical coupler anode is connected with the driving pin of the control unit, the first optical coupler cathode is grounded, the first optical coupler emitting electrode is connected with the switch module, and the first optical coupler collecting electrode is connected with one end of the driving resistor;
the other end of the driving resistor is connected with a direct current power supply.
3. The voltage doubler rectification and full-wave rectification automatic switching circuit according to claim 2, wherein the switching module comprises: the first switch tube, the second switch tube and the voltage stabilizing diode;
the drain electrode of the first switching tube is connected with a zero line of an alternating current power supply, the source electrode of the first switching tube is connected with the source electrode of the second switching tube, and the grid electrode of the first switching tube is connected with the grid electrode of the second switching tube;
the drain electrode of the second switching tube is connected with the filtering module;
the cathode of the voltage stabilizing diode is connected with the grid electrode connecting end of the first switching tube and the grid electrode connecting end of the second switching tube;
and the anode of the voltage stabilizing diode is connected with the connection end of the source electrode of the first switching tube and the source electrode of the second switching tube.
4. The voltage doubler rectification and full-wave rectification automatic switching circuit according to claim 3, wherein the rectification module comprises: a first diode, a second diode, a third diode and a fourth diode;
the anode of the first diode is respectively connected with a live wire of an alternating current power supply, and the cathode of the second diode is connected with the anode of the first diode;
the cathode of the first diode is connected with the direct current power supply;
the anode of the second diode is connected with the anode of the fourth diode and the connecting end of the filtering module;
the cathode of the third diode is connected with the direct current power supply;
and the anode of the third diode is connected with the cathode of the fourth diode.
5. The voltage doubler rectification and full-wave rectification automatic switching circuit according to claim 4, wherein the filtering module comprises: a first filter capacitor and a second filter capacitor;
one end of the first filter capacitor is connected with the direct-current power supply, and the other end of the first filter capacitor is connected with the drain electrode of the second switching tube and the connecting end of the second filter capacitor;
the other end of the second filter capacitor is connected with the anode connecting end of the second diode and the anode connecting end of the fourth diode.
6. A switching power supply, comprising: the voltage-multiplying rectification and full-wave rectification automatic switching circuit; the circuit includes: the device comprises a switch driving module, a switch module, a rectifying module and a filtering module;
the switch driving module is used for driving the switch module according to the instruction of the control unit;
the switch module is used for realizing the switching of voltage doubling rectification and full wave finishing by switching on and off the switch;
the rectifying module is used for converting the switching module into a corresponding voltage-multiplying rectifying state or a corresponding full-wave rectifying state according to the on or off state of the switching module;
and the filtering module is used for filtering and absorbing current fluctuation generated in the working process of the voltage-multiplying rectification and full-wave rectification automatic switching circuit and interference in series connection through an alternating current power supply.
7. The switching power supply according to claim 6, wherein the switch driving module comprises: the first optical coupler and the driving resistor;
the first optical coupler anode is connected with the driving pin of the control unit, the first optical coupler cathode is grounded, the first optical coupler emitting electrode is connected with the switch module, and the first optical coupler collecting electrode is connected with one end of the driving resistor;
the other end of the driving resistor is connected with a direct current power supply.
8. The switching power supply according to claim 7, wherein the switching module comprises: the first switch tube, the second switch tube and the voltage stabilizing diode;
the drain electrode of the first switching tube is connected with a zero line of an alternating current power supply, the source electrode of the first switching tube is connected with the source electrode of the second switching tube, and the grid electrode of the first switching tube is connected with the grid electrode of the second switching tube;
the drain electrode of the second switching tube is connected with the filtering module;
the cathode of the voltage stabilizing diode is connected with the grid electrode connecting end of the first switching tube and the grid electrode connecting end of the second switching tube;
and the anode of the voltage stabilizing diode is connected with the connection end of the source electrode of the first switching tube and the source electrode of the second switching tube.
9. The switching power supply according to claim 8, wherein the rectification module comprises: a first diode, a second diode, a third diode and a fourth diode;
the anode of the first diode is respectively connected with a live wire of an alternating current power supply, and the cathode of the second diode is connected with the anode of the first diode;
the cathode of the first diode is connected with the direct current power supply;
the anode of the second diode is connected with the anode of the fourth diode and the connecting end of the filtering module;
the cathode of the third diode is connected with the direct current power supply;
and the anode of the third diode is connected with the cathode of the fourth diode.
10. The switching power supply of claim 9, wherein the filtering module comprises: a first filter capacitor and a second filter capacitor;
one end of the first filter capacitor is connected with the direct-current power supply, and the other end of the first filter capacitor is connected with the drain electrode of the second switching tube and the connecting end of the second filter capacitor;
the other end of the second filter capacitor is connected with the anode connecting end of the second diode and the anode connecting end of the fourth diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022319167.8U CN212992222U (en) | 2020-10-16 | 2020-10-16 | Voltage-multiplying rectification and full-wave rectification automatic switching circuit and switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022319167.8U CN212992222U (en) | 2020-10-16 | 2020-10-16 | Voltage-multiplying rectification and full-wave rectification automatic switching circuit and switching power supply |
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| CN212992222U true CN212992222U (en) | 2021-04-16 |
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| CN202022319167.8U Active CN212992222U (en) | 2020-10-16 | 2020-10-16 | Voltage-multiplying rectification and full-wave rectification automatic switching circuit and switching power supply |
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