Isolation control switch circuit

Abstract

The utility model provides an isolation control switch circuit, which relates to the technical field of switch circuits, and comprises an input unit, a switch unit, an output unit and a control unit, and the control unit comprises a first end, a second end and an optical coupler U1. The first end is connected with the second end through the anode of the optical coupler U1 and the cathode of the optical coupler U1 in sequence, and is used for controlling the conduction of the optical coupler U1; the switch unit comprises a switch tube Q1, and a control end of the switch tube Q1 is connected to a common end through a collector electrode of the optical coupler U1 and an emitter electrode of the optical coupler U1 in sequence; the input unit is connected with the output unit through the two ends of the switching tube Q1 in sequence. According to the utility model, the problems of short service life, high noise and unsatisfactory actual use of the isolation control circuit in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switching circuit, especially isolating control's switching circuit. BACKGROUND

[0002] Switching circuit has been widely used in electronic products, and it is widely used in electronic product power supply with the characteristics of high efficiency, small size, light weight and low power consumption.

[0003] In the prior art, in order to electrical safety or to signal isolation (for example, to eliminate the mutual influence between the control signal and the controlled power supply or signal), the switching circuit needs to be isolated and controlled.

[0004] The isolation type electromagnetic relay is a common electronic control circuit that can be used for isolation control, which uses the magnetic field generated by the energized coil to attract the movable conductive moving piece to control the on-off of the switch. Since the isolation type electromagnetic relay is a mechanical switch, the mechanical life is short, and when the switch is turned off or closed, the internal mechanical components move, which is easy to produce mechanical noise, and the actual use is not ideal. SUMMARY

[0005] In view of the deficiencies in the prior art, the utility model provides an isolation control switching circuit, which solves the problems of short service life, large noise and poor actual use of the isolation control circuit in the prior art.

[0006] At least one embodiment of the utility model provides an isolation control switching circuit, which comprises:

[0007] The input unit, the switch unit, the output unit and the control unit, wherein,

[0008] The control unit comprises a first end, a second end and an optical coupler U1, the first end is connected with the second end through the anode of the optical coupler U1 and the cathode of the optical coupler U1 in sequence, and is used to control the conduction of the optical coupler U1.

[0009] The switch unit comprises a switch tube Q1, and the control end of the switch tube Q1 is connected to a common end through the collector of the optical coupler U1 and the emitter of the optical coupler U1 in sequence.

[0010] The input unit is connected with the output unit through the two ends of the switch tube Q1 in sequence.

[0011] The technical scheme disclosed by the utility model has at least the following beneficial effects:

[0012] In use, by controlling the voltage of the first end flowing through the anode and the cathode of the photocoupler switch U1 to the second end in turn, the on-off of the collector and the emitter of the other side of the photocoupler switch U1 can be controlled, and then the on-off control of the switch tube Q1 is completed, so that the on-off control of the input unit and the output unit is realized.

[0013] Since the photocoupler switch U1 used in the utility model realizes the on-off control of the collector and the emitter through the reaction of the photosensitive diode, the service life is longer, and it is more convenient and quiet.

[0014] In the switch circuit of the utility model, the switch circuit further comprises a voltage divider resistor R1, a voltage divider resistor R2 and a voltage divider resistor R3.

[0015] The switch tube Q1 is a MOS tube, the control end is a gate, and the input unit is connected with the output unit through the source and the drain of the switch tube Q1 in turn.

[0016] In the switch circuit of the utility model, the switch circuit further comprises a voltage divider resistor R1, a voltage divider resistor R2 and a voltage divider resistor R3.

[0017] The first end is connected with the anode of the photocoupler through the voltage divider resistor R1.

[0018] The collector of the photocoupler is connected with the gate of the switch tube Q1 through the voltage divider resistor R3, and the gate of the switch tube Q1 is connected with the emitter of the switch tube Q1 through the voltage divider resistor R2.

[0019] The technical scheme disclosed by the utility model has at least the following beneficial effects:

[0020] The resistor R1 is arranged to realize the adjustment of the current flowing through the anode and the cathode of the photocoupler U1, so that the voltage on-off control of the gate side of the switch tube Q1 is realized through the collector and the emitter side of the photocoupler switch U1, and the control voltage of the gate of the switch tube Q1 is adjusted by the voltage divider resistor R2 and the voltage divider resistor R3.

[0021] In the switch circuit of the utility model, the voltage divider resistor R1, the voltage divider resistor R2 and the voltage divider resistor R3 are all adjustable resistors.

[0022] The technical scheme disclosed by the utility model has at least the following beneficial effects:

[0023] By setting the voltage dividing resistor R1, the voltage dividing resistor R2 and the voltage dividing resistor R3 as adjustable resistors, the adjustment of the resistors can be facilitated, so that the circuit can work stably even if the voltage output of the first end and the second end is affected by abnormal temperature or environment, and temperature offset occurs.

[0024] In the switch circuit of the isolation control provided in one of the embodiments of the utility model, the switch unit further comprises: a debugging capacitor C7, and the gate of the switch tube Q1 is connected with the emitter of the switch tube Q1 through the debugging capacitor C7.

[0025] The technical scheme provided by the utility model has at least the following beneficial effects:

[0026] Through the setting of the debugging circuit, the starting parasitic capacitor of the optocoupler switch U1 can be offset.

[0027] In the switch circuit of the isolation control provided in one of the embodiments of the utility model, the switch unit further comprises: a clamping tube Z1, and the gate of the switch tube Q1 is connected with the emitter of the switch tube Q1 through the clamping tube Z1.

[0028] The technical scheme provided by the utility model has at least the following beneficial effects:

[0029] Through the setting of the clamping tube Z1, the gate voltage of the switch tube Q1 can be clamped.

[0030] In the switch circuit of the isolation control provided in one of the embodiments of the utility model, the input unit further comprises: an input end Vin1, an input end GO1, a capacitor C1, a capacitor C4, a capacitor C6 and an inductor L1, wherein,

[0031] The input end GO1 is connected with a common end, the input end Vin1 is connected with the input end GO1 through the capacitor C1, the capacitor C4 is connected with the capacitor C1 in parallel, and the input end Vin1 is connected with the input end GO1 through the inductor L1 and the capacitor C6 in sequence.

[0032] The input end Vin1 is connected with the emitter of the switch tube Q1 through the inductor L1.

[0033] The technical scheme provided by the utility model has at least the following beneficial effects:

[0034] Through the setting of the capacitor C1, the capacitor C4, the capacitor C6 and the inductor L1, a pi-type filter circuit is formed, the structure is simple, and signals in a specific frequency range can be filtered well.

[0035] In the switch circuit of the isolation control provided in one of the embodiments of the utility model, the input unit further includes: a capacitor C3 and a capacitor C5, wherein,

[0036] The input end Vin1 is connected with the shell through the capacitor C3, and the input end GO1 is connected with the shell through the capacitor C5.

[0037] The technical scheme provided by the utility model has at least the following beneficial effects:

[0038] Through the arrangement of the capacitor C3 and the capacitor C5, the common mode signal filtering of the input end Vin1 and the input end GO1 can be realized.

[0039] In the switch circuit of the isolation control provided in one of the embodiments of the utility model, the output unit includes: an output end Vo1, an output end Go1, a capacitor C8 and a capacitor C9, wherein,

[0040] The collector of the switch tube Q1 is connected with the output end Vo1;

[0041] The collector of the switch tube Q1 is connected with the output end Go1 through the capacitor C8 and the capacitor C9 respectively.

[0042] The technical scheme provided by the utility model has at least the following beneficial effects:

[0043] Through the capacitor C8 and the capacitor C9, the output signal filtering of the output end Vo1 and the output end Go1 can be realized.

[0044] In the switch circuit of the isolation control provided in one of the embodiments of the utility model, the control unit further includes: a capacitor C2, and the first end is connected with the second end through the capacitor C2.

[0045] The technical scheme provided by the utility model has at least the following beneficial effects:

[0046] The capacitor C2 is used for filtering the control voltage of the first end and the second end. BRIEF DESCRIPTION OF DRAWINGS

[0047] Figure 1 The utility model discloses a specific circuit diagram;

[0048] In the drawings, the components represented by each reference numeral are listed as follows:

[0049] S1, input unit, S2, switch unit, S3, output unit, S4, control unit. DETAILED DESCRIPTION

[0050] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not to limit the scope of the utility model.

[0051] The utility model provides a switch circuit of isolation control, please refer to Figure 1 Shown, including:

[0052] Input unit, switch unit, output unit and control unit, wherein,

[0053] The control unit includes first end, second end and photo coupler U1, in this embodiment, the first end is 5V voltage, which is represented by "5V" in Figure 1 , the second end is 3-5V voltage controlled by F_ON2 port, which is represented by "F_ON2" in Figure 1 ;

[0054] The first end is connected with the second end through the anode of photo coupler U1 and the cathode of photo coupler U1 in turn, to control the conduction of photo coupler U1;

[0055] The switch unit includes switch tube Q1, in this embodiment, the switch tube Q1 is MOS tube, the control end of switch tube Q1, i.e. the gate of MOS tube is connected to the common end through the collector of photo coupler U1 and the emitter of photo coupler U1 in turn;

[0056] The input unit is connected with the output unit through the two ends of switch tube Q1, i.e. the source and drain of switch tube Q1 in turn.

[0057] When using, the voltage size of the first end through photo coupler switch U1 anode and cathode to the second end can control the on-off of the collector and emitter of photo coupler switch U1, and then the on-off control of switch tube Q1 is completed, to realize the on-off control of input unit and output unit;

[0058] Because the photo coupler switch U1 used in the utility model realizes the conduction control of collector and emitter through the reaction of photosensitive diode, its service life is longer, and it is more convenient and quiet.

[0059] Specifically, the switch circuit further includes: voltage dividing resistor R1, voltage dividing resistor R2 and voltage dividing resistor R3, wherein,

[0060] The first end is connected with the anode of photo coupler through voltage dividing resistor R1;

[0061] The collector of the photocoupler is connected to the gate of the switch tube Q1 through the voltage dividing resistor R3, and the gate of the switch tube Q1 is connected to the emitter of the switch tube Q1 through the voltage dividing resistor R2.

[0062] The resistance R1 is arranged to adjust the current flowing through the anode and cathode of the photocoupler U1, so as to realize the voltage on-off control of the gate side of the switch tube Q1 through the collector and emitter side of the photocoupler U1, and the voltage dividing resistors R2 and R3 are used to divide voltage for adjusting the control voltage of the gate of the switch tube Q1.

[0063] Specifically, the voltage dividing resistors R1, R2 and R3 are adjustable resistors.

[0064] By arranging the voltage dividing resistors R1, R2 and R3 as adjustable resistors, the adjustment of the above resistors can be facilitated, so that the circuit can work stably even if the transmission ratio of the photocoupler U1 is affected by abnormal temperature or environment, and the transmission ratio of the photocoupler U1 is offset by temperature.

[0065] Specifically, the switch unit further comprises a debugging capacitor C7, and the gate of the switch tube Q1 is connected to the emitter of the switch tube Q1 through the debugging capacitor C7.

[0066] By arranging the debugging circuit, the starting parasitic capacitance of the photocoupler U1 can be offset.

[0067] Specifically, the switch unit further comprises a clamping tube Z1, and the gate of the switch tube Q1 is connected to the emitter of the switch tube Q1 through the clamping tube Z1.

[0068] By arranging the clamping tube Z1, the gate voltage of the switch tube Q1 can be clamped.

[0069] Specifically, the input unit further comprises an input terminal Vin1, an input terminal GO1, a capacitor C1, a capacitor C4, a capacitor C6 and an inductor L1, wherein,

[0070] The input terminal GO1 is connected to a common terminal, the input terminal Vin1 is connected to the input terminal GO1 through the capacitor C1, the capacitor C4 is connected in parallel with the capacitor C1, and the input terminal Vin1 is connected to the input terminal GO1 through the inductor L1 and the capacitor C6 in sequence.

[0071] The input terminal Vin1 is connected to the emitter of the switch tube Q1 through the inductor L1.

[0072] The capacitors C1, C4, C6 and the inductor L1 are arranged to form a pi-type filter circuit, which has simple structure and can filter signals in a specific frequency range.

[0073] Specifically, the input unit further comprises capacitors C3 and C5.

[0074] The input terminal Vin1 is connected to the shell through the capacitor C3, and the input terminal GO1 is connected to the shell through the capacitor C5.

[0075] The capacitors C3 and C5 are arranged to filter common-mode signals on the input terminal Vin1 and the input terminal GO1.

[0076] Specifically, the output unit comprises output terminals Vo1 and Go1, capacitors C8 and C9.

[0077] The collector of the switch tube Q1 is connected to the output terminal Vo1.

[0078] The collector of the switch tube Q1 is also connected to the output terminal Go1 through the capacitors C8 and C9, respectively.

[0079] The capacitors C8 and C9 are arranged to filter output signals of the output terminals Vo1 and Go1.

[0080] Specifically, the control unit further comprises a capacitor C2, and the first end is connected to the second end through the capacitor C2.

[0081] The capacitor C2 is used to filter control voltages of the first end and the second end.

[0082] Through the above arrangement:

[0083] Since the transmission ratio range of the optocoupler switch U1 is wide and the temperature variation amplitude is large, by setting the resistance values of the voltage dividing resistors R1, R2 and R3, the optocoupler switch U1 can still work normally even if the transmission ratio deviates due to temperature under various temperature conditions. The voltage range applied to the first end "5V" and the second end "FON-2" port is 3-5V. Considering the temperature drift in this input voltage range, by adjusting the resistance values of the voltage dividing resistors R1, R2 and R3, the control unit can work stably under full temperature conditions within the input range.

[0084] In use, the input terminal Vin1 and the input terminal GO1 are powered, and at this time, the enable control end is not powered, i.e. the first end and the second end are not powered, the switch tube Q1 is not driven, the switch unit is not turned on, and the output terminals Vo1 and GO1 have no output.

[0085] The input terminal Vin1 and the input terminal GO1 are powered on, at this time, the power-on is enabled, that is, the first terminal and the second terminal are powered on, the diode in the optocoupler switch U1 has current flowing through, by adjusting the resistance values of the voltage dividing resistor R1, the voltage dividing resistor R2 and the voltage dividing resistor R3, the optocoupler switch U1 is in the conducting state, the collector and the emitter of the triode in the secondary side of the optocoupler switch U1 are conducted, then the voltage dividing resistor R3 is equivalent to the ground, at this time, the voltage dividing resistor R2 and the voltage dividing resistor R3 divide the input voltage to make the gate voltage of the switch tube Q1 meet the opening condition, the switch tube Q1 is in the conducting state, at this time, the switch unit is opened, considering the voltage drop of the switch tube Q1 and the voltage drop of the line impedance, the output voltage is approximately equal to the input voltage, and the circuit realizes the output.

[0086] The control voltage in the first terminal and the second terminal of the circuit is wide and is isolated from the input terminal and the output terminal, stable enable control is realized under the full temperature condition, and the circuit is simple and reliable.

[0087] In the utility model, unless another definite provision and limitation, the terms "mount", "connect", "joint", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirect connection through the intermediate medium, can be the intercommunication of two elements or the interaction of two elements, unless another definite limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0088] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0089] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and modify the above-mentioned embodiments within the scope of the utility model.

Claims

1. An isolated control switching circuit, characterized by, The switch circuit comprises an input unit (S1), a switch unit (S2), an output unit (S3) and a control unit (S4), wherein the control unit (S4) comprises a first end, a second end and an optocoupler U1, the first end is connected with the second end through an anode of the optocoupler U1 and a cathode of the optocoupler U1 in sequence, and is used for controlling conduction of the optocoupler U1; the switch unit (S2) comprises a switch tube Q1, a control end of the switch tube Q1 is connected with a common end through a collector of the optocoupler U1 and an emitter of the optocoupler U1 in sequence; the input unit (S1) is connected with the output unit (S3) through two ends of the switch tube Q1 in sequence. The switch tube Q1 is a MOS tube, the control end is a gate, and the input unit (S1) is connected with the output unit (S3) through a source and a drain of the switch tube Q1 in sequence.

2. An isolated control switching circuit according to claim 1, wherein, The switch circuit further comprises a voltage dividing resistor R1, a voltage dividing resistor R2 and a voltage dividing resistor R3, wherein the first end is connected with the anode of the optocoupler through the voltage dividing resistor R1; 3. An isolated control switching circuit according to claim 2, wherein the collector of the optocoupler is connected with the gate of the switch tube Q1 through the voltage dividing resistor R3, and the gate of the switch tube Q1 is connected with the emitter of the switch tube Q1 through the voltage dividing resistor R2. The voltage dividing resistor R1, the voltage dividing resistor R2 and the voltage dividing resistor R3 are adjustable resistors. The switch unit (S2) further comprises a debugging capacitor C7, and the gate of the switch tube Q1 is connected with the emitter of the switch tube Q1 through the debugging capacitor C7.

4. An isolated control switching circuit according to claim 3, wherein: The switch unit (S2) further comprises a clamping tube Z1, and the gate of the switch tube Q1 is connected with the emitter of the switch tube Q1 through the clamping tube Z1.

5. An isolated control switching circuit according to claim 4, wherein The input unit (S1) further comprises an input end Vin1, an input end GO1, a capacitor C1, a capacitor C4, a capacitor C6 and an inductor L1, wherein 6. An isolated control switching circuit according to claim 4, wherein, the input end GO1 is connected with a common end, the input end Vin1 is connected with the input end GO1 through the capacitor C1, the capacitor C4 is connected with the capacitor C1 in parallel, and the input end Vin1 is connected with the input end GO1 through the inductor L1 and the capacitor C6 in sequence; 7. An isolated control switching circuit according to claim 4, wherein the input end Vin1 is connected with the emitter of the switch tube Q1 through the inductor L1. The input unit (S1) further comprises a capacitor C3 and a capacitor C5, wherein the input end Vin1 is connected with a shell through the capacitor C3, and the input end GO1 is connected with the shell through the capacitor C5.

8. An isolated control switching circuit according to claim 7, wherein, The output unit (S3) comprises an output end Vo1, an output end Go1, a capacitor C8 and a capacitor C9, wherein the collector of the switch tube Q1 is connected with the output end Vo1; 9. An isolated control switching circuit according to claim 4, wherein, the collector of the switch tube Q1 is connected with the output end Go1 through the capacitor C8 and the capacitor C9 respectively. The control unit (S4) further comprises a capacitor C2, and the first end is connected with the second end through the capacitor C2. ​ 10. An isolated control switching circuit according to claim 4, wherein, ​

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