CN215010046U - Rectifying device and electric equipment - Google Patents
Rectifying device and electric equipment Download PDFInfo
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- CN215010046U CN215010046U CN202120892130.6U CN202120892130U CN215010046U CN 215010046 U CN215010046 U CN 215010046U CN 202120892130 U CN202120892130 U CN 202120892130U CN 215010046 U CN215010046 U CN 215010046U
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Abstract
The application provides a rectifying device and consumer, wherein the rectifying device is arranged in the consumer in, includes: the system comprises a first half-bridge module, a second half-bridge module, a controllable half-bridge module and an isolation driver; the isolation driver is a transistor or a field effect transistor, at the moment of starting the electric equipment, the isolation driver controls the controllable half-bridge module to be switched off, and the first half-bridge module and the second half-bridge module are matched to rectify the alternating current and then quickly charge the filter capacitor; when the electric equipment is transited from the starting state to the stable working state, the isolation driver controls the controllable half-bridge module to be opened, and the first half-bridge module is matched with the controllable half-bridge module to rectify the alternating current and then output the direct current. The problem of bulky, with high costs that traditional bridge type rectification and surge controlling means exist has been solved in this application.
Description
Technical Field
The application relates to the technical field of power supply control, in particular to a rectifying device and electric equipment.
Background
In the existing high-frequency switching power supply system, alternating current is generally required to be converted into direct current through a rectifying device and then transmitted to a rear-stage circuit, the most commonly used rectifying device is generally bridge rectification, and because the rear-stage circuit generally comprises a large-capacity filter capacitor, an anti-surge circuit must be added in an input circuit to avoid the damage of the rectifying device, the filter capacitor or other devices caused by surge current due to instantaneous quick charging of the capacitor in the starting process of power consumption equipment.
As shown in fig. 1, a device labeled 200 in fig. 1 is a conventional bridge rectifier and surge control device, a current limiting resistor (generally, a negative temperature coefficient thermistor) is connected in series in an input line, in order to avoid the influence of the current limiting resistor on the current conversion efficiency, a switching device (which may be a relay or a semiconductor switch) is connected in parallel at two ends of the current limiting resistor, the alternating current at the moment of starting the electric equipment firstly passes through a fuse in the electric equipment, an EMI filter network, and then is limited by the current limiting resistor, the rectified current is then output to a filter capacitor for charging, and after the electric equipment enters a steady state operation, the switching device connected in parallel with the current limiting resistor is closed, so as to eliminate the influence of the current limiting resistor on the current conversion efficiency. However, since the bridge rectifier is rectified by two rectifier diodes connected in series during each half cycle of operation, and the forward voltage drop VF of the rectifier diodes is large (generally about 1.2V), the loss caused by the bridge rectifier accounts for a large proportion of the power consumption of the whole machine, and the switching device connected in parallel with the current-limiting resistor is high in cost, and if the switching device is a semiconductor component, a large extra loss is also caused, and if the switching device is a relay, the loss is negligible but large in size, so that the size of the whole bridge rectifier and surge control device is increased, and the miniaturization of the device is not facilitated.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a rectifying device and electric equipment, and solves the problems of large size and high cost of the traditional bridge rectifying and surge control device.
In a first aspect, a rectifying device is provided, which is built in an electrical device, and includes: the half-bridge module comprises a first half-bridge module, a second half-bridge module and a controllable half-bridge module;
the first output end of the first half-bridge module, the first input end of the second half-bridge module and the first input end of the controllable half-bridge module are all used for being connected with the positive output end of the EMI filter network;
the second output end of the first half-bridge module, the second input end of the second half-bridge module and the second input end of the controllable half-bridge module are all used for being connected with the negative output end of the EMI filter network;
the input end of the first half-bridge module is used for being connected with the negative electrode of a filter capacitor, and the output end of the second half-bridge module and the output end of the controllable half-bridge module are both used for being connected with the positive electrode of the filter capacitor;
the control end of the controllable half-bridge module is connected with the output end of the second half-bridge module, and an isolation driver is arranged on a connecting circuit between the control end of the controllable half-bridge module and the output end of the second half-bridge module;
the isolation driver is a transistor or a field effect transistor.
According to the rectifying device provided by the embodiment of the application, a first half-bridge module, a second half-bridge module and a controllable half-bridge module are connected, an isolation driver is arranged to replace a switching device in a traditional bridge rectifying and surge control device, and at the moment of starting electric equipment, the controllable half-bridge module is controlled to be turned off, so that the first half-bridge module and the second half-bridge module are matched to rectify current output from an EMI filter network and then charge a filter capacitor; when the electric equipment is transited from the starting state to the stable working state, the controllable half-bridge module is controlled to be conducted, so that the first half-bridge module and the controllable half-bridge module are matched to rectify the current output from the EMI filter network and output direct current. The isolation driver is a transistor or a field effect transistor, so that the isolation driver and the controllable half-bridge module can be directly integrated together, the whole volume of the rectifying device is reduced, and the cost of the rectifying device is lower than that of a switching device by taking the transistor or the field effect transistor as a basic component, so that the cost of the rectifying device is reduced.
In one possible design, the first half-bridge module includes diode D1 and diode D2;
the cathode of the diode D1 is a first output terminal of the first half-bridge module, and the cathode of the diode D2 is a second output terminal of the first half-bridge module;
the common junction of the anode of the diode D1 and the anode of the diode D2 is the input of the first half-bridge module.
In one possible design, the second half-bridge module includes diode D3 and diode D4;
the anode of the diode D3 is the first input terminal of the second half-bridge module, and the anode of the diode D4 is the second input terminal of the second half-bridge module;
the common junction of the cathode of the diode D3 and the cathode of the diode D4 is the output of the second half-bridge module.
In one possible design, the controllable half-bridge module includes thyristor Q1 and thyristor Q2;
the anode of the thyristor Q1 is a first input end of the controllable half-bridge module, and the anode of the thyristor Q2 is a second input end of the controllable half-bridge module;
the common junction point of the cathode of the thyristor Q1 and the cathode of the thyristor Q2 is the output end of the controllable half-bridge module;
the common junction of the control electrode of the thyristor Q1 and the control electrode of the thyristor Q2 is the control end of the controllable half-bridge module.
In one possible design, the rectifying device further includes a current limiting resistor;
the first end of the current limiting resistor is connected with the output end of the second half-bridge module;
and the second end of the current-limiting resistor is connected with the anode of the filter capacitor.
In one possible design, the isolation driver is an insulated gate bipolar transistor or a MOS field effect transistor of the edge gate type;
and the grid electrode of the isolation driver is connected with the output end of the second half-bridge module, and the drain electrode of the isolation driver is connected with the control end of the controllable half-bridge module.
In a second aspect, there is provided an electrical device comprising:
an EMI filter network;
a filter capacitor;
as with the rectifying device described above, the rectifying device is connected to the EMI filter network and the filter capacitor, respectively.
The beneficial effect that this application realized does: the isolation driver is adopted to replace a switching device in the traditional bridge type rectification and surge control device, so that the controllable half-bridge module can be controlled to be switched off at the moment of starting the electric equipment, and the first half-bridge module and the second half-bridge module are matched to rectify the current output from the EMI filter network and then charge the filter capacitor; when the electric equipment is transited from the starting state to the stable working state, the controllable half-bridge module is controlled to be conducted, so that the first half-bridge module and the controllable half-bridge module are matched to rectify the current output from the EMI filter network and then output the direct current rectification effect, and the isolation driver is a transistor or a field effect transistor, so that the isolation driver is smaller than the switch device in size and lower in cost, and the whole size of the rectification device is reduced and the cost is reduced.
Drawings
Fig. 1 is a structural diagram of a bridge rectifier and surge control device provided in the prior art.
Fig. 2 is a block diagram of a rectifying device according to an embodiment of the present application.
Fig. 3 is a circuit configuration diagram of an example of a rectifying device according to an embodiment of the present application.
Fig. 4 is another exemplary circuit configuration diagram of a rectifying device according to an embodiment of the present application.
Reference numerals: 10. a first half-bridge module; 20. a second half-bridge module; 30. a controllable half-bridge module; 40. a current limiting resistor; 50. an isolation driver;
100. an EMI filter network;
200. a rectifying device;
300. and a filter capacitor.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "at least one" means one or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the same reference numerals are used to denote the same components or parts in the embodiments of the present application, and for the same parts in the embodiments of the present application, only one of the parts or parts may be given the reference numeral, and it should be understood that the reference numerals are also applicable to the other same parts or parts.
The embodiment of the application provides a rectifying device and electric equipment, and solves the problems of large size and high cost of the traditional bridge rectifying and surge control device.
As shown in fig. 2, a rectifying device 200 provided in the embodiment of the present application is built in an electric device, and includes a first half-bridge module 10, a second half-bridge module 20, and a controllable half-bridge module 30;
a first output of the first half-bridge module 10, a first input of the second half-bridge module 20 and a first input of the controllable half-bridge module 30 are all for connecting to a positive output of the EMI filter network 100;
a second output of the first half-bridge module 10, a second input of the second half-bridge module 20 and a second input of the controllable half-bridge module 30 are all for connecting to a negative output of the EMI filter network 100;
the input end of the first half-bridge module 10 is used for connecting the negative electrode of the filter capacitor 300, and the output ends of the second half-bridge module 20 and the controllable half-bridge module 30 are both used for connecting the positive electrode of the filter capacitor 300;
the control end of the controllable half-bridge module 30 is connected with the output end of the second half-bridge module 20, and an isolation driver 50 is arranged on a connecting line between the control end of the controllable half-bridge module 30 and the output end of the second half-bridge module 20;
the isolation driver 50 is a transistor or a field effect transistor.
According to the rectifying device 200 provided by the embodiment of the application, the first half-bridge module 10, the second half-bridge module 20 and the controllable half-bridge module 30 are connected to form a connection, the isolation driver 50 is arranged to replace a switching device in a traditional bridge rectifying and surge control device, and at the moment of starting an electric device, the controllable half-bridge module 30 is controlled to be turned off, so that the first half-bridge module 10 and the second half-bridge module 20 are matched to rectify a current output from the EMI filter network 100 and then charge the filter capacitor 300; when the electric equipment is transited from the starting state to the stable working state, the controllable half-bridge module 30 is controlled to be turned on, so that the first half-bridge module 10 and the controllable half-bridge module 30 cooperate to rectify the current output from the EMI filter network 100 and output a direct current. Since the isolation driver 50 is a transistor or a fet, the isolation driver and the controllable half-bridge module 30 can be directly integrated, which reduces the overall size of the rectifier device, and the fet, as a basic component, has a lower cost than the switching device, so the cost of the rectifier device 200 of the present application is reduced.
Optionally, the isolation driver 50 is an insulated gate bipolar transistor or an edge gate type MOS field effect transistor; the isolated driver 50 has a gate connected to the output of the second half-bridge module 20 and a drain connected to the control terminal of the controllable half-bridge module 30.
Compared with the traditional light-switching device, the volume of the rectifying device can be greatly reduced by using the insulated gate bipolar transistor or the edge gate type MOS field effect transistor as the switch.
As shown in fig. 3-4, the first half-bridge module 10 includes a diode D1 and a diode D2;
the cathode of the diode D1 is the first output terminal of the first half-bridge module 10, and the cathode of the diode D2 is the second output terminal of the first half-bridge module 10; the common junction of the anode of diode D1 and the anode of diode D2 is the input of the first half-bridge module 10.
In the above arrangement, the diode D1 and the diode D2 can utilize the unidirectional conductivity of the diodes, and can convert the alternating current into the pulsating direct current, thereby preventing the current from flowing backwards; the diode has two terminals of positive pole and negative pole, so can prevent to connect wrong positive negative pole.
As shown in fig. 3-4, the second half-bridge module 20 includes a diode D3 and a diode D4;
the anode of the diode D3 is the first input terminal of the second half-bridge module 20, and the anode of the diode D4 is the second input terminal of the second half-bridge module 20; the common junction of the cathode of the diode D3 and the cathode of the diode D4 is the output of the second half-bridge module 20.
In the above arrangement, the diode D3 and the diode D4 can utilize the unidirectional conductivity of the diodes, and can convert the alternating current into the pulsating direct current, thereby preventing the current from flowing backwards; the diode has two terminals of positive pole and negative pole, so can prevent to connect wrong positive negative pole.
In practical applications, the diodes D3 and D4 may be diodes with small on-state current and certain surge withstand capability, such as diodes with model number 1N5406 or S3M, which have low cost and small size, and are much smaller than the cost and size of relays and other power semiconductor switches.
As shown in fig. 3-4, the controllable half-bridge module 30 includes a thyristor Q1 and a thyristor Q2;
the anode of the thyristor Q1 is the first input terminal of the controllable half-bridge module 30, and the anode of the thyristor Q2 is the second input terminal of the controllable half-bridge module 30; the common junction of the cathode of the controlled silicon Q1 and the cathode of the controlled silicon Q2 is the output end of the controllable half-bridge module 30; the common junction of the gate of thyristor Q1 and the gate of thyristor Q2 is the control terminal of the controllable half-bridge module 30.
In the above arrangement, the thyristor Q1 and the thyristor Q2 can utilize the one-way conductivity of the thyristor, the thyristor has a control electrode, and has two control states of on or off, the thyristor Q1 and the thyristor Q2 can be used in combination with an isolation driver to play a role in that current passes through a current-limiting resistor or does not pass through a current-limiting resistor, so as to suppress surge current, compared with a conventional switching device, the thyristor Q1, the thyristor Q2 and the isolation driver have smaller volumes, the cost is lower, and the volume and the cost of the rectifying device can be further reduced.
As shown in fig. 2-4, the rectifying device further includes a current limiting resistor 40; a first end of the current limiting resistor 40 is connected to the output end of the second half-bridge module 20; the second terminal of the current limiting resistor 40 is connected to the anode of the filter capacitor 300.
Through the above arrangement, at the moment of starting the electric equipment, the current limiting resistor 40 performs surge suppression processing on the surge current in the alternating current or the direct current output by the EMI filter network 100, thereby ensuring that the rectifying device, the filter capacitor 300 and other devices are not damaged due to the impact of the surge current.
The above-described rectifying device 200 is further described below with reference to the working principle:
at the moment of starting the electric equipment, the diode D1, the diode D2, the diode D3 and the diode D4 form a rectifier bridge circuit to rectify alternating current or direct current output by the EMI filter network 100 and then quickly charge the filter capacitor 300, and meanwhile, the current limiting resistor 40 performs surge suppression processing on surge current in the alternating current or direct current, so that the rectifier device 200, the filter capacitor 300 and other devices are not damaged by the impact of the surge current, and in the process, the isolation driver 50 is closed, so that the anti-surge control signals output by the diode D3 and the diode D4 control the turn-off of the thyristor Q1 and the thyristor Q2; when the electric equipment enters a stable working state (namely, the voltage of two poles of the filter capacitor 300 reaches the working voltage of the electric equipment), the isolation driver 50 is turned on, the anti-surge control signals output by the diode D3 and the diode D4 control the conduction of the silicon controlled rectifier Q1 and the silicon controlled rectifier Q2, and at the moment, a rectifier bridge circuit consisting of the diode D1, the diode D2, the silicon controlled rectifier Q1 and the silicon controlled rectifier Q2 rectifies the alternating current or the direct current output by the EMI filter network 100 and provides direct current DC for the electric equipment.
In the above operating principle, since the on-state voltage drop of the thyristors Q1 and Q2 is generally lower than the forward voltage drop of the diodes, the conversion efficiency of the whole rectifying device 200 is higher than that of the conventional bridge rectifier, and the power consumption is also reduced accordingly.
As an alternative implementation, the circuit structure diagram of the rectifying device 200 in the embodiment of the present application may be designed as shown in fig. 4, and the diode D1, the diode D2, the diode D3, and the diode D4 are connected to form a rectifying bridge circuit, so that the spatial distribution of each element included in the rectifying device 200 may be more reasonable, the space occupied by the formed circuit is smaller, and the volume of the rectifying device 200 is further reduced.
The electric equipment provided by the embodiment of the application comprises an EMI filter network 100; a filter capacitor 300; as with the rectifier device 200 described above, the rectifier device 200 is connected to the EMI filter network 100 and the filter capacitor 300, respectively.
The rectifying device 200 is adopted by the electric equipment, so that not only can the rectifying effect be well achieved, but also the electric equipment adopting the rectifying device 200 can be made smaller in size and lower in cost due to the small size and low cost of the rectifying device 200.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A rectifying device built in an electric device, comprising: a first half-bridge module (10), a second half-bridge module (20) and a controllable half-bridge module (30);
a first output of the first half-bridge module (10), a first input of the second half-bridge module (20) and a first input of the controllable half-bridge module (30) are all for connecting a positive output of an EMI filter network (100);
a second output of the first half-bridge module (10), a second input of the second half-bridge module (20) and a second input of the controllable half-bridge module (30) are all for connecting a negative output of the EMI filter network (100);
the input end of the first half-bridge module (10) is used for connecting the negative electrode of a filter capacitor (300), and the output end of the second half-bridge module (20) and the output end of the controllable half-bridge module (30) are both used for connecting the positive electrode of the filter capacitor (300);
the control end of the controllable half-bridge module (30) is connected with the output end of the second half-bridge module (20), and an isolation driver (50) is arranged on a connecting line between the control end of the controllable half-bridge module (30) and the output end of the second half-bridge module (20);
the isolation driver (50) is a transistor or a field effect transistor.
2. The rectifying device according to claim 1, characterized in that said first half-bridge module (10) comprises a diode D1 and a diode D2;
the cathode of the diode D1 is a first output terminal of the first half-bridge module (10), and the cathode of the diode D2 is a second output terminal of the first half-bridge module (10);
the common junction of the anode of the diode D1 and the anode of the diode D2 is the input of the first half-bridge module (10).
3. The rectifying arrangement according to claim 1, characterized in that the second half-bridge module (20) comprises a diode D3 and a diode D4;
the anode of the diode D3 is a first input terminal of the second half-bridge module (20), and the anode of the diode D4 is a second input terminal of the second half-bridge module (20);
the common junction of the cathode of the diode D3 and the cathode of the diode D4 is the output of the second half-bridge module (20).
4. The rectifying arrangement according to claim 1, wherein the controllable half-bridge module (30) comprises a thyristor Q1 and a thyristor Q2;
the anode of the thyristor Q1 is a first input terminal of the controllable half-bridge module (30), and the anode of the thyristor Q2 is a second input terminal of the controllable half-bridge module (30);
the common junction of the cathode of the thyristor Q1 and the cathode of the thyristor Q2 is the output end of the controllable half-bridge module (30);
the common junction of the control electrode of the thyristor Q1 and the control electrode of the thyristor Q2 is the control end of the controllable half-bridge module (30).
5. The rectifying device according to claim 1, characterized in that it further comprises a current limiting resistor (40);
the first end of the current limiting resistor (40) is connected with the output end of the second half-bridge module (20);
and the second end of the current limiting resistor (40) is connected with the anode of the filter capacitor (300).
6. The rectifying device according to claim 1, characterized in that said isolating driver (50) is an insulated gate bipolar transistor or a MOS field effect transistor of the edge gate type;
the gate of the isolated driver (50) is connected to the output of the second half-bridge module (20) and the drain is connected to the control terminal of the controllable half-bridge module (30).
7. An electrical device, comprising:
an EMI filter network (100);
a filter capacitance (300);
the rectifying device (200) according to any of claims 1 to 6, wherein the rectifying device (200) is connected to the EMI filter network (100) and the filter capacitor (300), respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892130.6U CN215010046U (en) | 2021-04-27 | 2021-04-27 | Rectifying device and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120892130.6U CN215010046U (en) | 2021-04-27 | 2021-04-27 | Rectifying device and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215010046U true CN215010046U (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120892130.6U Active CN215010046U (en) | 2021-04-27 | 2021-04-27 | Rectifying device and electric equipment |
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| Country | Link |
|---|---|
| CN (1) | CN215010046U (en) |
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2021
- 2021-04-27 CN CN202120892130.6U patent/CN215010046U/en active Active
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