CN215344377U - Isolated double-output DC-DC power supply and industrial control equipment - Google Patents
Isolated double-output DC-DC power supply and industrial control equipment Download PDFInfo
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- CN215344377U CN215344377U CN202120918929.8U CN202120918929U CN215344377U CN 215344377 U CN215344377 U CN 215344377U CN 202120918929 U CN202120918929 U CN 202120918929U CN 215344377 U CN215344377 U CN 215344377U
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Abstract
The utility model relates to an isolated double-output DC-DC power supply and industrial control equipment, which comprise an input filter capacitor, an enabling voltage dividing resistor, a DC-DC main circuit, an output filter capacitor, a voltage feedback resistor and an isolating and rectifying circuit, wherein the DC-DC main circuit is provided with a first inductor which has the effect of a transformer, and the first inductor is connected with a decoupling device. The utility model provides an isolated double-circuit output DC-DC power supply is through increasing decoupling device on current isolated double-circuit output DC-DC power supply circuit basis, and set this decoupling device to be connected with the first inductance that plays the transformer effect in the DC-DC main circuit, thereby when first inductance L1 in the DC-DC main circuit appears the leakage inductance because of isolation loop voltage F _5V heavy load or short circuit of its output all the way, utilize this decoupling device to supply the leakage inductance of a certain magnitude, ensure the voltage stability that this DC-DC power supply circuit exported, the emergence of two way output voltage mutual crosstalk condition has been avoided.
Description
Technical Field
The utility model relates to the field of DC-DC power supplies, in particular to an isolated double-output DC-DC power supply and industrial control equipment.
Background
When power is supplied to industrial control equipment, in order to avoid mutual crosstalk of power supplies of the industrial control equipment and meet safety performance requirements, an isolation power supply is generally used in the conventional power supply of the industrial control equipment, and the isolation type DC-DC power supply is a common power supply of the industrial control equipment.
The isolated DC-DC power supply, also called an isolated DC-DC converter, has a simple circuit structure, can isolate the output of voltage and avoid crosstalk of the output voltage, and is suitable for being used as a low-power supply and various DC power supply adapters.
The existing isolated DC-DC power supply mainly comprises an input filter capacitor, an enabling voltage dividing resistor, a DC-DC main circuit, an output filter capacitor, a voltage feedback resistor and an isolating rectification circuit. When voltage needs to be output to the outside, when an isolation rectification circuit of the existing isolation type DC-DC power supply is short-circuited, a DC-DC main circuit cannot work normally, two isolated output voltages are influenced due to load change of the DC-DC main circuit, and the two isolated output voltages are easy to generate mutual crosstalk.
SUMMERY OF THE UTILITY MODEL
The first technical problem to be solved by the present invention is to provide an isolated dual-output DC-DC power supply in view of the above prior art. The isolated double-output DC-DC power supply can effectively avoid the mutual crosstalk of two isolated output voltages, and improve the stability of the output voltage of the isolated double-output DC-DC power supply.
The second technical problem to be solved by the present invention is to provide an industrial control device using the isolated dual-output DC-DC power supply in view of the above prior art.
The technical scheme adopted by the utility model for solving the first technical problem is as follows: an isolated dual output DC-DC power supply, comprising:
an input filter capacitor having a first input capacitor and a second input capacitor;
the enabling voltage dividing resistor is provided with a first resistor and a second resistor, the first end of the first resistor is respectively connected with the first end of the first input capacitor and the first end of the second input capacitor, the second end of the first resistor is connected with the first end of the second resistor, and the second end of the first input capacitor, the second end of the second input capacitor and the second end of the second resistor are respectively connected with the grounding end;
the DC-DC main circuit is provided with a chip, a third resistor, a third capacitor and a first inductor, wherein the chip is connected with the first end of the second resistor, the first end of the third resistor is respectively connected with the input sides of the chip and the first inductor, the second end of the third resistor is connected with the first end of the third capacitor, and the second end of the third capacitor is connected with the chip;
the output filter capacitor is provided with a fourth capacitor and a fifth capacitor, and the first end of the fourth capacitor and the first end of the fifth capacitor are respectively connected with the grounding end;
the voltage feedback resistor is provided with a fourth resistor and a fifth resistor, the first end of the fourth resistor is respectively connected with the chip and the first end of the fifth resistor, the second end of the fifth resistor is connected with the grounding end, and the second end of the fourth resistor is respectively connected with the second end of the fourth capacitor and the second end of the fifth capacitor;
the isolation rectifying circuit is provided with a rectifying diode, a sixth resistor, a sixth capacitor and a seventh capacitor, the anode of the rectifying diode is connected with the output side of the first inductor, the cathode of the rectifying diode is respectively connected with the first end of the sixth capacitor, the first end of the seventh capacitor and the first end of the sixth resistor, and the second end of the sixth capacitor, the second end of the seventh capacitor and the second end of the sixth resistor are respectively connected with the grounding end;
characterized in that it further comprises a decoupling device connected to the first inductance in the main DC-DC circuit.
As an arrangement of the coupling device in the isolated dual-output DC-DC power supply, the decoupling device is connected to the input side of the first inductor, and the other end of the decoupling device is connected to the second end of the fourth capacitor and the second end of the fifth capacitor, respectively.
As another arrangement of the coupling device in the isolated dual-output DC-DC power supply, it is improved that in the isolated dual-output DC-DC power supply, the decoupling device is connected to the output side of the first inductor, and the other end of the decoupling device is connected to the anode of the rectifying diode.
Further, in the isolated dual-output DC-DC power supply, the decoupling device is an inductive device. For example, the inductor is a chip inductor, a wire-wound inductor or an i-shaped inductor.
Of course, according to actual needs, the decoupling device may also be a resistive device in the isolated dual-output DC-DC power supply.
The technical scheme adopted by the utility model for solving the second technical problem is as follows: the industrial control equipment is characterized in that any one of the isolated two-way output DC-DC power supplies is used for supplying power.
Compared with the prior art, the utility model has the advantages that: the utility model discloses an increase decoupling device on current isolated double-circuit output DC-DC power supply circuit basis to the first inductance that plays the transformer effect in with this decoupling device and the DC-DC main circuit is connected, thereby when first inductance in the DC-DC main circuit appears the leakage inductance because of isolation loop voltage heavy load of its output or short circuit all the way, utilize this decoupling device to supply the leakage inductance of a certain order, ensure the voltage stability that this DC-DC power supply circuit exported, avoid the two way output voltage of DC-DC power supply to take place the condition of mutual crosstalk.
Drawings
Fig. 1 is a circuit diagram of an isolated dual-output DC-DC power supply according to a first embodiment of the utility model;
fig. 2 is a circuit diagram of an isolated dual-output DC-DC power supply according to a second embodiment of the utility model.
Detailed Description
The utility model is described in further detail below with reference to the accompanying examples.
Example one
As shown in fig. 1, the isolated dual-output DC-DC power supply provided in this embodiment includes an input filter capacitor, an enable voltage dividing resistor, a DC-DC main circuit, an output filter capacitor, a voltage feedback resistor, an isolation rectification circuit, and a decoupling device. Wherein:
the input filter capacitor is provided with a first input capacitor C1 and a second input capacitor C2, and the input filter capacitor formed by the first input capacitor C1 and the second input capacitor C2 is used for providing input instantaneous large current when the DC-DC power supply works and bypassing high-frequency noise generated when the isolated DC-DC power supply works;
the enabling voltage dividing resistor is provided with a first resistor R1 and a second resistor R2, the first end of the first resistor R1 is connected with the first end of a first input capacitor C1 and the first end of a second input capacitor C2 respectively, the second end of the first resistor R1 is connected with the first end of a second resistor R2, and the second end of the first input capacitor C1, the second end of the second input capacitor C2 and the second end of the second resistor R2 are connected with a ground terminal GND respectively; the first resistor R1 and the second resistor R2 together form an enabling voltage dividing resistor which is used for setting an operating threshold value of the input voltage of the DC-DC power supply, and when the input voltage reaches a certain voltage value, the DC-DC power supply starts to operate;
the DC-DC main circuit is provided with a chip N1, a third resistor R3, a third capacitor C3 and a first inductor L1, wherein the chip N1 is connected with a first end of a second resistor R2, a first end of a third resistor R3 is respectively connected with input sides of the chip N1 and the first inductor L1, a second end of a third resistor R3 is connected with a first end of the third capacitor C3, and a second end of a third capacitor C3 is connected with the chip N1; here, the first inductor L1 is actually a transformer; the chip N1, the third resistor R3, the third capacitor C3 and the first inductor L1 form a core part of an isolated double-output DC-DC power supply circuit, the chip N1 provides a high-frequency modulation pulse width signal to drive the first inductor L1, energy is stored and released through the first inductor L1, the first inductor L1 provides two paths of output voltages, and the two paths of output voltages are a main loop voltage M _5V and an isolated loop voltage F _5V respectively;
the output filter capacitor is provided with a fourth capacitor C4 and a fifth capacitor C5, and the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5 are respectively connected with a ground terminal GND; the fourth capacitor C4 and the fifth capacitor C5 form an output filter capacitor for filtering output voltage ripples and providing stable and low-ripple direct-current voltage for the rear end;
the voltage feedback resistor is provided with a fourth resistor R4 and a fifth resistor R5, the first end of the fourth resistor R4 is respectively connected with the first ends of the chip N1 and the fifth resistor R5, the second end of the fifth resistor R5 is connected with the ground end GND, and the second end of the fourth resistor R4 is respectively connected with the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5; the fourth resistor R4 and the fifth resistor R5 form a voltage feedback resistor together, the output voltage signal of the voltage feedback resistor is sampled, the sampled signal is fed back to the chip N1 and used for adjusting the working state of the chip N1, the set voltage is stably output, and the effect of adjusting the output voltage is achieved by adjusting the resistor proportion;
an isolation rectifying circuit, which has a rectifying diode VD1, a sixth resistor R6, a sixth capacitor C6 and a seventh capacitor C7, wherein the anode of the rectifying diode VD1 is connected to the output side of the first inductor L1, the cathode of the rectifying diode VD1 is connected to the first end of the sixth capacitor C6, the first end of the seventh capacitor C7 and the first end of the sixth resistor R6, respectively, and the second end of the sixth capacitor C6, the second end of the seventh capacitor C7 and the second end of the sixth resistor R6 are connected to the ground terminal F _ GND, respectively; the rectifier diode VD1, the sixth resistor R6, the sixth capacitor C6 and the seventh capacitor C7 form a secondary rectifier output circuit, and the isolation rectifier circuit converts the energy stored in the first inductor L1 into an isolation direct-current voltage for output and supplies the isolation direct-current voltage to an isolation load for use;
the decoupling device is connected to the input side of the first inductor L1, and the other end of the decoupling device is connected to the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5, respectively. In this embodiment, the decoupling device herein employs an inductor L2, and the inductor L2 herein may be a chip inductor or a wound inductor or an i-inductor, as required.
When the isolated dual-output DC-DC power supply of this embodiment is operating, the first inductor L1 for isolation is used to store and convert energy, when the isolation loop voltage F _5V is heavily loaded or short-circuited, the secondary inductance of the pin 2 and the pin 3 of the first inductor L1 is reduced or is in a short-circuit state, at this time, the primary side test inductance at the pin 1 to the pin 4 of the first inductor L1 is leakage inductance, the inductance of the leakage inductance is at a low level, when the chip N1 of the DC-DC main circuit is operating, the inductance is low leakage inductance of the first inductor L1, and the peak current is large. At this time, the inductor L2 as a decoupling device will additionally supplement a certain amount of leakage inductance, even if the secondary side of the pin 2 and the pin 3 of the first inductor L1 is shorted, the inductance value of the chip N1 during operation is the sum of the low leakage inductance of the first inductor L1 and the inductance of the inductor L2, and the inductance value under the operation condition is increased, so that the problem that the peak current of the inductor rapidly rises is avoided.
In the isolated dual-output DC-DC power supply, the main loop voltage M _5V is a feedback loop by using the first inductor L1 to store and convert energy, so the amount of energy stored and converted in the first inductor L1 is completely dependent on the feedback loop. When the DC-DC main circuit voltage M _5V is heavily loaded, the pulse width of the chip N1 increases, the amount of energy stored and converted in the first inductor L1 increases, and therefore the isolation loop voltage F _5V also increases. When the main loop voltage M _5V is lightly loaded, the pulse width of the chip N1 is adjusted to be small, the energy stored and converted in the first inductor L1 is reduced, and therefore the isolation loop voltage F _5V is also reduced. At this time, the inductor L2 functions to attenuate the energy storage and release of the first inductor L1. When the main loop voltage M _5V is heavily loaded, the pulse width of the chip N1 is adjusted to be larger, and since the inductor L2 increases the leakage inductance of the first inductor L1, the energy coupled to the isolation loop by the first inductor L1 will be less, so that the increase of the isolation loop voltage F _5V is no longer obvious. And vice versa. Therefore, the mutual crosstalk between the main loop voltage M _5V and the isolation loop voltage F _5V is attenuated by the decoupling device (i.e., the inductor L2) provided here.
Specifically, the detailed process for avoiding the mutual crosstalk between the two output voltages is described as follows:
when the non-isolated output loop M _5V is in a heavy load state, the feedback voltage detects M _5V, the DCDC increases the duty ratio to meet the heavy load power requirement, and the current of the coupling transformer L1 rises. The isolated output loop F _5V is coupled to the same coupling transformer L1, but the isolated output loop F _5V is lightly loaded, and the voltage of the isolated output loop F _5V will be high. The optimization circuit adds the first inductor L2 in series with the coupling transformer L1, which means that the leakage inductance of the coupling transformer L1 is additionally added, and the coupling degree of the isolated output loop F _5V and the non-isolated output loop M _5V is reduced, so that the isolated output loop F _5V does not float high any more.
When the isolated output loop F _5V is in a short-circuit state, the current of the coupling transformer L1 rises sharply, the non-isolated output loop M _5V detects the current rising sharply, the DCDC is triggered to enter a protection function, the DCDC stops working, and the non-isolated output loop M _5V is affected. The optimization circuit adds a first inductor L2 in series with the coupling transformer L1, when the isolated output loop F _5V is short-circuited, the first inductor L2 prevents the current of the coupling transformer L1 from sharply rising, and therefore, the short-circuit state of the non-isolated output loop M _5V is avoided.
In summary, the mutual crosstalk between the two output voltages can be avoided by adding the first inductor L2.
In addition, according to the actual needs, a resistive device may also be used as the decoupling device in this embodiment.
Moreover, this embodiment also provides an industrial control device that uses the isolated dual-output DC-DC power supply described above for power supply.
Example two
As shown in fig. 2, the isolated dual-output DC-DC power supply provided in this embodiment includes an input filter capacitor, an enable voltage dividing resistor, a DC-DC main circuit, an output filter capacitor, a voltage feedback resistor, an isolation rectification circuit, and a decoupling device; the difference from the first embodiment is that the decoupling device in this embodiment is connected to the output side of the first inductor L1, and the other end of the decoupling device is connected to the anode of the rectifying diode VD 1.
Although preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An isolated dual output DC-DC power supply, comprising:
an input filter capacitance having a first input capacitance (C1) and a second input capacitance (C2);
the enabling voltage dividing resistor is provided with a first resistor (R1) and a second resistor (R2), the first end of the first resistor (R1) is connected with the first end of the first input capacitor (C1) and the first end of the second input capacitor (C2) respectively, the second end of the first resistor (R1) is connected with the first end of the second resistor (R2), and the second end of the first input capacitor (C1), the second end of the second input capacitor (C2) and the second end of the second resistor (R2) are connected with a ground terminal (GND) respectively;
the DC-DC main circuit is provided with a chip (N1), a third resistor (R3), a third capacitor (C3) and a first inductor (L1), wherein the chip (N1) is connected with a first end of the second resistor (R2), a first end of the third resistor (R3) is respectively connected with input sides of the chip (N1) and the first inductor (L1), a second end of the third resistor (R3) is connected with a first end of the third capacitor (C3), and a second end of the third capacitor (C3) is connected with the chip (N1);
the output filter capacitor is provided with a fourth capacitor (C4) and a fifth capacitor (C5), and the first end of the fourth capacitor (C4) and the first end of the fifth capacitor (C5) are respectively connected with the ground terminal (GND);
the voltage feedback resistor is provided with a fourth resistor (R4) and a fifth resistor (R5), the first end of the fourth resistor (R4) is connected with the first ends of the chip (N1) and the fifth resistor (R5) respectively, the second end of the fifth resistor (R5) is connected with the ground end (GND), and the second end of the fourth resistor (R4) is connected with the second end of the fourth capacitor (C4) and the second end of the fifth capacitor (C5) respectively;
and an isolation rectifying circuit, which is provided with a rectifying diode (VD1), a sixth resistor (R6), a sixth capacitor (C6) and a seventh capacitor (C7), wherein the anode of the rectifying diode (VD1) is connected with the output side of the first inductor (L1), the cathode of the rectifying diode (VD1) is respectively connected with the first end of the sixth capacitor (C6), the first end of the seventh capacitor (C7) and the first end of the sixth resistor (R6), and the second end of the sixth capacitor (C6), the second end of the seventh capacitor (C7) and the second end of the sixth resistor (R6) are respectively connected with a ground terminal (F _ GND);
characterized in that it further comprises a decoupling device connected to the first inductance (L1) in the main DC-DC circuit.
2. The isolated dual output DC-DC power supply of claim 1, wherein the decoupling device is connected to the input side of the first inductor (L1), and the other end of the decoupling device is connected to the second end of the fourth capacitor (C4) and the second end of the fifth capacitor (C5), respectively.
3. The isolated dual output DC-DC power supply of claim 1, wherein the decoupling device is connected to the output side of the first inductor (L1), and the other end of the decoupling device is connected to the anode of the rectifying diode (VD 1).
4. An isolated dual output DC-DC power supply according to claim 2 or 3, wherein the decoupling device is an inductive device.
5. The isolated dual output DC-DC power supply of claim 4, wherein the inductor is a patch inductor.
6. The isolated dual output DC-DC power supply of claim 4, wherein the inductor is a wound inductor.
7. The isolated dual output DC-DC power supply of claim 4, wherein the inductor is an I-inductor.
8. An isolated dual output DC-DC power supply according to claim 2 or 3, wherein the decoupling device is a resistive device.
9. The isolated dual output DC-DC power supply of claim 8, wherein the decoupling device is a resistor.
10. Industrial control equipment, characterized in that the isolated two-way output DC-DC power supply of any of claims 1 to 9 is applied for power supply.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113078818A (en) * | 2021-04-29 | 2021-07-06 | 宁波三星医疗电气股份有限公司 | Isolated double-output DC-DC power supply and industrial control equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113078818A (en) * | 2021-04-29 | 2021-07-06 | 宁波三星医疗电气股份有限公司 | Isolated double-output DC-DC power supply and industrial control equipment |
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