CN213717620U - Anti-surge solid-state direct current relay circuit - Google Patents
Anti-surge solid-state direct current relay circuit Download PDFInfo
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- CN213717620U CN213717620U CN202022844555.8U CN202022844555U CN213717620U CN 213717620 U CN213717620 U CN 213717620U CN 202022844555 U CN202022844555 U CN 202022844555U CN 213717620 U CN213717620 U CN 213717620U
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Abstract
The utility model provides an anti-surge solid-state direct current relay circuit, includes transistor, switching device and negative feedback module, the first end of transistor is connected switching device's first end, second end connection load, third end connection DC voltage source's output, the negative feedback module is connected the first end of transistor with between the second end of transistor, switching device's second end receiving control signal. Implement the utility model discloses a prevent surge solid-state direct current relay circuit through setting up negative feedback loop for load voltage rises slowly, thereby with surge current control in effective range, consequently can obviously reduce output direct current relay surge, and make the power can not produce overcurrent protection because of the surge, output capacitor voltage keeps steady, thereby increases the stability of power and load, reduces the trouble.
Description
Technical Field
The utility model relates to a power supply system, more specifically say, relate to a prevent surge solid-state direct current relay circuit.
Background
The output port of the existing power supply is directly controlled by an external step signal by using a P-channel field effect transistor as a direct current relay switch. When the field effect transistor is conducted, the conduction speed is very high. If the load input port has a large capacitor, the energy storage filter capacitor of the power output port can generate a strong direct current relay surge to the capacitor of the load input port, and the capacitor body at two ports of the power output port and the load input port can be damaged in an impact manner, and the requirement on the impact resistance of the middle connector and the field effect transistor is high. If the capacitance capacity of the load input port is close to or even exceeds the capacitance capacity of the power output port, the direct current relay surge can seriously pull down the power output voltage, and the power overcurrent protection and even direct damage can be caused. In addition, in a multi-output power supply, serious direct current relay surge occurs in one path, which can cause the voltage output by other paths to fluctuate violently and cause the work abnormality of other paths of loads.
Various power supplies and devices today face capacitive loading problems, including switching power supplies of various topologies and power frequency supplies. These capacitive loads include DC-DC circuits and other electronic devices, and their input ports are connected in parallel with capacitors with larger capacity for better reduction of input ripple and enhanced stability. With the increasing emphasis on energy conservation and environmental protection or other special requirements, it is desirable that these capacitive loads be well powered only when they are in use and be completely powered off when they are not in use. The solid-state direct-current relay circuit gradually replaces the traditional relay to realize the function due to the advantages of small volume, light weight, no mechanical contact, no carbon deposition, long service life and the like.
However, when the conventional solid-state dc relay circuit is used for a capacitive load, the generated dc relay surge may adversely affect both the power supply and the load, and may be increased as the capacitance of the load port increases.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide one kind can obviously reduce output direct current relay surge, increase the stability of power and load, reduce the solid-state direct current relay circuit of surge prevention of trouble.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a prevent surge solid-state direct current relay circuit, includes transistor, switching device and negative feedback module, the first end of transistor is connected switching device's first end, second end connection load, third end connection direct current voltage source, the negative feedback module is connected the first end of transistor with between the second end of transistor, switching device's second end receives control signal.
Prevent among the solid-state direct current relay circuit of surge, the negative feedback module includes negative feedback electric capacity, negative feedback electric capacity's first end is connected the first end of transistor, second end are connected the second end of transistor.
Prevent among the solid-state direct current relay circuit of surge, negative feedback module includes negative feedback electric capacity and bleeder resistor, negative feedback electric capacity with bleeder resistor is connected to after establishing ties the first end of transistor with between the second end of transistor.
Prevent among the solid-state direct current relay circuit of surge, negative feedback electric capacity's first end is connected second end, the second end warp of transistor the bleeder resistance is connected the first end of transistor.
In the surge-proof solid-state dc relay circuit of the present invention, the negative feedback module further comprises a diode, an anode of the diode is connected to the second end and a cathode of the negative feedback capacitor, respectively, to the first end of the transistor.
Prevent among the solid-state direct current relay circuit of surge, bleeder resistance's first end is connected second end, the second end warp of transistor negative feedback electric capacity is connected the first end of transistor.
In the surge-proof solid-state dc relay circuit of the present invention, the negative feedback module further includes a diode, an anode of the diode is connected to the second end of the transistor and a cathode of the transistor are connected to the second end of the bleeder resistor.
In the surge-proof solid-state dc relay circuit of the present invention, the surge-proof solid-state dc relay circuit further includes a first resistor and a second resistor, the first resistor is connected between the third end and the first end of the transistor, the second resistor is connected between the second end of the transistor and the first end of the switch device.
In the surge-proof solid-state dc relay circuit of the present invention, the transistor includes a switching tube and a field-effect tube.
The utility model provides a another technical scheme that its technical problem adopted is, construct a surge-proof solid-state direct current relay circuit, including field effect transistor, switching device, negative feedback electric capacity, bleeder resistance, diode, first resistance and second resistance, the gate warp of field effect transistor second resistance connection direct current voltage source, drain electrode connection load are connected to the first end, the source electrode of switching device, first resistance is connected between the source electrode and the gate of field effect transistor, negative feedback electric capacity's first end is connected drain electrode, the second end warp of field effect transistor bleeder resistance connects the gate of field effect transistor, the positive pole of diode is connected negative feedback electric capacity's second end, negative pole are connected the gate of field effect transistor, switching device's second end receiving control signal.
Implement the utility model discloses a prevent surge solid-state direct current relay circuit through setting up negative feedback loop for load voltage rises slowly, thereby with surge current control in effective range, consequently can obviously reduce output direct current relay surge, and make the power can not produce overcurrent protection because of the surge, output capacitor voltage keeps steady, thereby increases the stability of power and load, reduces the trouble.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a preferred embodiment of an anti-surge solid-state dc relay circuit of the present invention;
fig. 2 is a circuit diagram of another preferred embodiment of the surge protection solid-state dc relay circuit of the present invention;
fig. 3 is a circuit diagram of still another preferred embodiment of the surge protection solid-state dc relay circuit of the present invention;
fig. 4 is a circuit diagram of another preferred embodiment of the surge protection solid-state dc relay circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model relates to a prevent surge solid-state direct current relay circuit, including transistor, switching device and negative feedback module, the first end of transistor is connected switching device's first end, second end connection load, third end connection direct current voltage source, the negative feedback module is connected the first end of transistor with between the second end of transistor, switching device's second end receiving control signal. Implement the utility model discloses a prevent surge solid-state direct current relay circuit through setting up negative feedback loop for load voltage rises slowly, thereby with surge current control in effective range, consequently can obviously reduce output direct current relay surge, and make the power can not produce overcurrent protection because of the surge, output capacitor voltage keeps steady, thereby increases the stability of power and load, reduces the trouble.
Fig. 1 is a schematic block diagram of a preferred embodiment of the surge protection solid-state dc relay circuit of the present invention. As shown in fig. 1, the surge protection solid-state dc relay circuit of the present invention includes a transistor 100, a switching device 300, and a negative feedback module 200. As shown in fig. 1, the first terminal of the transistor 100 is connected to the first terminal of the switching device 300, the second terminal is connected to the load, the third terminal is connected to the output terminal of the dc voltage source 400, the negative feedback module 200 is connected between the first terminal of the transistor 100 and the second terminal of the transistor 100, and the second terminal and the input control terminal of the switching device 300 receive the control signal.
In a preferred embodiment of the present invention, the transistor 100 includes a switch transistor and a field effect transistor. The negative feedback module 200 comprises a negative feedback capacitor, wherein a first end of the negative feedback capacitor is connected to the first end of the transistor 100, and a second end of the negative feedback capacitor is connected to the second end of the transistor 100. In a preferred embodiment of the present invention, the switching device 300 may be a relay, a switching tube or a field effect tube, which is turned on or off based on an external control signal.
In the preferred embodiment, the negative feedback circuits are arranged at the second end and the first end of the transistor 100, so that the load voltage can rise slowly, the surge current can be controlled in an effective range, the output direct current relay surge can be reduced obviously, the power supply can not generate overcurrent protection due to the surge, the output capacitor voltage is kept stable, the stability of the power supply and the load is improved, and the faults are reduced.
In a further preferred embodiment of the present invention, the negative feedback module 200 comprises a negative feedback capacitor and a bleeder resistor, and the negative feedback capacitor and the bleeder resistor are connected in series and then connected between the first end of the transistor 100 and the second end of the transistor 100. Preferably, the order of the negative feedback capacitor and the bleeder resistor can be exchanged. For example, the first terminal of the degeneration capacitor may be connected to the second terminal of the transistor 100, and the second terminal may be connected to the first terminal of the transistor 100 via the bleeding resistor. For another example, the first terminal of the bleeder resistor may be connected to the second terminal of the transistor 100, and the second terminal may be connected to the first terminal of the transistor 100 via the degeneration capacitor. The discharge resistor is arranged, so that charges on the negative feedback capacitor can be discharged conveniently, and the direct-current anti-surge function can be realized more effectively when the next controlled start is carried out.
In a further preferred embodiment of the present invention, the negative feedback module 200 may further include a diode, and the diode may be connected in parallel to both ends of the bleeder resistor. The provision of a diode may allow the transistor 100 to be turned off quickly.
Fig. 2 is a circuit diagram of another preferred embodiment of the surge protection solid-state dc relay circuit of the present invention. In the preferred embodiment shown in fig. 2, the surge-prevention solid-state dc relay circuit includes a field-effect transistor Q1, a switching device 300, a negative feedback capacitor C1, a bleeder resistor R3, a diode D1, a resistor R1, and a resistor R2. As shown in fig. 2, the gate of the fet Q1 is connected to the first terminal of the switching device 300 through the resistor R2, the source thereof is connected to the output terminal of the dc voltage source, and the drain thereof is connected to the load 500. The resistor R1 is connected between the source and the gate of the field effect transistor Q1. The first end of the negative feedback capacitor C1 is connected with the drain of the field effect transistor Q1, and the second end is connected with the gate of the field effect transistor Q1 through the bleeder resistor R3. The anode of the diode D1 is connected to the second end of the negative feedback capacitor C1, and the cathode is connected to the gate of the field effect transistor Q1. A second terminal, an input control terminal, of the switching device 300 receives a control signal.
Preferably, the fet Q1 is a P-channel fet. Of course, other suitable switching tubes may be selected. Preferably, in another preferred embodiment of the present invention, the positions of the negative feedback capacitor C1, the bleeder resistor R3 and the diode D1 may be changed, that is, the positions of the parallel circuit of the bleeder resistor R3 and the diode D1 and the negative feedback capacitor C1 may be changed. The load 500 is preferably a capacitive load.
The principle of the present invention is described below with reference to fig. 2, and the core of the dc anti-surge of the present invention is the negative feedback effect of the negative feedback capacitor C1. The negative feedback capacitor C1 feeds back the drain potential change (rising speed) of the fet Q1 to the gate. Because the drain electrode and the grid electrode of the field effect transistor Q1 are in an inverse relationship, the rapid drop of the grid electrode potential is prevented, the increasing speed of the grid voltage is reduced, and the speed of reducing the internal resistance of the field effect transistor Q1 is reduced. And the diode D1 acts as a one-way negative feedback. When controlled to be conducted, the drain of the field effect transistor Q1 carries out negative feedback on the gate through a negative feedback capacitor C1 and a diode D1. When the controlled cut-off (cut-off) is carried out, the diode D1 is reversely biased, the change of the drain voltage of the field effect transistor Q1 can not be fed back to the grid electrode of the diode D1 through the negative feedback capacitor C1, and therefore the field effect transistor Q1 can be controlled to be cut off (cut off) at a higher speed. Therefore, the diode D1 achieves negative feedback to achieve the surge prevention function when the fet Q1 is turned on, but shields the negative feedback function of the negative feedback capacitor C1 when the fet Q1 is turned off, so that the fet Q1 can be turned off quickly. The bleeder resistor R3 can be used as a bleeder resistor of the negative feedback capacitor C1, so when the fet Q1 is turned off, the charge on the negative feedback capacitor C1 cannot be released through the diode D1 (because the diode D1 is reversely biased), a certain voltage can be maintained on the negative feedback capacitor C1, and this voltage will be greatly influenced by the negative feedback action of the negative feedback capacitor C1 when the fet Q1Q1 is turned on next time, so the bleeder resistor R3 releases the voltage on the negative feedback capacitor C1 as soon as possible after the fet Q1 is turned off, so as to ensure effective negative feedback when the fet Q1 is turned on next time.
Thus, as described above, in a simplified embodiment of the present invention, only the negative feedback capacitor C1 may be included, or only the negative feedback capacitor C1 and the bleed resistor R3 may be included. Of course, it is preferable to include all three.
Fig. 3 is a circuit diagram of still another preferred embodiment of the surge protection solid-state dc relay circuit of the present invention. In the preferred embodiment shown in fig. 3, the surge protection solid-state dc relay circuit may be further connected to the input terminal of the dc voltage source. As shown in fig. 3, the gate of the fet Q1 is similarly connected to the first terminal of the switching device 300 through the resistor R2, the source thereof is connected to the input terminal of the dc voltage source, and the drain thereof is connected to the load 500. The principle is similar to that of fig. 2 and will not be described again here. Similarly, fig. 4 shows another embodiment of the surge protection solid-state dc relay circuit of the present invention, wherein the surge protection solid-state dc relay circuit is externally and independently connected to a dc power source and a load.
Therefore, implement the utility model discloses a prevent surge solid-state direct current relay circuit through setting up negative feedback loop for load voltage rises slowly, thereby with surge current control in effective range, consequently can obviously reduce output direct current relay surge, and make the power can not produce overcurrent protection because of the surge, output capacitor voltage keeps steady, thereby increases the stability of power and load, reduces the trouble.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a prevent surge solid-state direct current relay circuit, its characterized in that, includes transistor, switching device and negative feedback module, the first end of transistor is connected switching device's first end, second end connection load, third end connection DC voltage source, the negative feedback module is connected the first end of transistor with between the second end of transistor, switching device's second end receives control signal.
2. The surge protection solid-state direct current relay circuit according to claim 1, wherein the negative feedback module comprises a negative feedback capacitor, a first end of the negative feedback capacitor is connected to a first end of the transistor, and a second end of the negative feedback capacitor is connected to a second end of the transistor.
3. The anti-surge solid-state direct current relay circuit according to claim 1, wherein the negative feedback module comprises a negative feedback capacitor and a discharging resistor, and the negative feedback capacitor and the discharging resistor are connected in series and then connected between the first end of the transistor and the second end of the transistor.
4. The surge protection solid-state direct current relay circuit according to claim 3, wherein a first end of the negative feedback capacitor is connected to a second end of the transistor, and a second end of the negative feedback capacitor is connected to the first end of the transistor through the bleeder resistor.
5. The surge protection solid-state direct current relay circuit according to claim 4, wherein the negative feedback module further comprises a diode, an anode of the diode is connected to the second terminal of the negative feedback capacitor, and a cathode of the diode is connected to the first terminal of the transistor.
6. The surge protection solid-state direct current relay circuit according to claim 3, wherein a first end of the bleed-off resistor is connected to a second end of the transistor, and a second end of the bleed-off resistor is connected to the first end of the transistor through the degeneration capacitor.
7. The anti-surge solid-state direct current relay circuit according to claim 6, wherein the negative feedback module further comprises a diode, an anode of the diode is connected to the second terminal of the transistor, and a cathode of the diode is connected to the second terminal of the bleeder resistor.
8. The surge protection solid-state direct current relay circuit according to any one of claims 1 to 7, further comprising a first resistor and a second resistor, wherein the first resistor is connected between the third terminal and the first terminal of the transistor, and the second resistor is connected between the second terminal of the transistor and the first terminal of the switching device.
9. The surge protection solid-state direct current relay circuit according to claim 8, wherein said transistor comprises a switching transistor and a field effect transistor.
10. The utility model provides an anti-surge solid-state direct current relay circuit, its characterized in that, includes field effect transistor, switching device, negative feedback electric capacity, bleeder resistance, diode, first resistance and second resistance, the gate warp of field effect transistor second resistance connects switching device's first end, source connection direct current voltage source, drain electrode connection load, first resistance is connected between field effect transistor's source electrode and gate, negative feedback electric capacity's first end is connected field effect transistor's drain electrode, second end warp bleeder resistance connects field effect transistor's gate, the positive pole of diode is connected negative feedback electric capacity's second end, negative pole are connected field effect transistor's gate, switching device's second end receiving control signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022844555.8U CN213717620U (en) | 2020-11-30 | 2020-11-30 | Anti-surge solid-state direct current relay circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022844555.8U CN213717620U (en) | 2020-11-30 | 2020-11-30 | Anti-surge solid-state direct current relay circuit |
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| Publication Number | Publication Date |
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| CN213717620U true CN213717620U (en) | 2021-07-16 |
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| CN202022844555.8U Active CN213717620U (en) | 2020-11-30 | 2020-11-30 | Anti-surge solid-state direct current relay circuit |
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