CN203014679U - Improved fault safe DC-DC power supply equipment - Google Patents
Improved fault safe DC-DC power supply equipment Download PDFInfo
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- CN203014679U CN203014679U CN201220450734.6U CN201220450734U CN203014679U CN 203014679 U CN203014679 U CN 203014679U CN 201220450734 U CN201220450734 U CN 201220450734U CN 203014679 U CN203014679 U CN 203014679U
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Abstract
The utility model provides improved fault safe DC-DC power supply equipment, which comprises an output voltage circuit, an output voltage feedback circuit, an output voltage readback circuit, and a load current readback circuit, wherein the output voltage circuit comprises an amplifying circuit, a first MOS switching tube, a first isolation transformer, a first rectifying and filtering circuit, a voltage stabilizing circuit and a short-circuit protection circuit which are connected in sequence; the output voltage feedback circuit is connected between the voltage stabilizing circuit and the amplifying circuit and forms a loop with the amplifying circuit, the first MOS switching tube, the first isolation transformer, the first rectifying and filtering circuit and the voltage stabilizing circuit, and is used for stabilizing the output voltage to a preset voltage range; the output voltage readback circuit is used for reading the output voltage state; and the load current readback circuit is used for reading the load current state. The improved fault safe DC-DC power supply equipment has the beneficial effect that the existing fault safe power supply circuit is improved, so as to enhance the efficientibility, stability, safe reliability and practicability of the power supply equipment.
Description
Technical field
The utility model relates to electronic applications, especially, relates to a kind of modified model failure safe DC-DC power-supply device.
Background technology
At present, the general fail-safe circuit implementing method of intrinsic formula that adopts of the Safety output circuit of rail traffic signal system, this circuit is a low power DC-DC power module, be input as 24VDC, be output as 25VDC, input simultaneously also has two-way to enable control impuls, when two-way control impuls that and if only if exists simultaneously, just allows DC-DC output.Sort circuit satisfies failure to safety principle, namely is comprised of the clear and definite discrete component of fault mode, and arbitrary element fault wherein all can make circuit failure to the safe side side---be output as low-voltage (less than 1VDC).
In the prior art, as shown in Figure 1, owing to there is no the output voltage feedback circuit, power supply conversion efficiency is low, the MOS switching tube caloric value that causes in circuit being used for controlling isolating transformer is large, failure rate is high, in addition,, cause and to carry out failure diagnosis to out-put supply not to the retaking of a year or grade function of output voltage, load current at the power supply output.
The utility model content
In order to address the deficiencies of the prior art, the utility model provides a kind of modified model failure safe DC-DC power-supply device, and it has increased output voltage feedback circuit, output voltage retaking of a year or grade circuit and load current retaking of a year or grade circuit.Its purpose is: existing failure safe power circuit is improved, improve efficientibility, stability, security reliability and the practicality of power-supply device with this.
For achieving the above object, the utility model is taked following technical scheme:
A kind of modified model failure safe DC-DC power-supply device; comprise the output voltage circuit; the output voltage circuit comprises amplifying circuit, a MOS switching tube, the first isolating transformer, the first rectification and filter circuit, voltage stabilizing circuit and the short-circuit protection circuit that connects in turn; the output of short-circuit protection circuit comprises positive output end and negative output terminal, also comprises:
The output voltage feedback circuit, it is connected between voltage stabilizing circuit and amplifying circuit, consists of a loop with amplifying circuit, a MOS switching tube, the first isolating transformer, the first rectification and filter circuit and voltage stabilizing circuit.
Preferably, DC-DC power-supply device described in the utility model also comprises output voltage retaking of a year or grade circuit, and it is connected to the output of short-circuit protection circuit, is used for reading the output voltage state.
Preferably, DC-DC power-supply device described in the utility model also comprises load current retaking of a year or grade circuit, and it is connected to the output of short-circuit protection circuit, is used for reading the load current state.
Preferably, the output voltage feedback circuit comprises the first isolation optocoupler and the 2nd MOS switching tube, the input of the first isolation optocoupler is connected to the input of voltage stabilizing circuit, the output of the first isolation optocoupler is connected to the input of the 2nd MOS switching tube, and the output of the 2nd MOS switching tube is connected to the output of amplifying circuit.
Preferably, output voltage retaking of a year or grade circuit comprises constant-current source circuit and the second isolation optocoupler of connecting with constant-current source circuit, and the input of constant-current source circuit is connected with the output of short-circuit protection circuit.
preferably, constant-current source circuit comprises the first triode, the second triode, the first resistance and the second resistance, the collector electrode of the positive pole of the first resistance and the first triode all is connected to the positive output end of short-circuit protection circuit, the base stage of the first triode, the collector electrode of the negative pole of the first resistance and the second triode all is connected in the first tie point, the base stage of the second triode, the positive pole of the emitter of the first triode and the second resistance all is connected in the second tie point, the emitter of the negative pole of the second resistance and the second triode all is connected to the input of the second isolation optocoupler, the output of the second isolation optocoupler is connected to the negative output terminal of short-circuit protection circuit.
Preferably, load current retaking of a year or grade circuit comprises transistor amplifier and the 3rd isolation optocoupler that is connected with transistor amplifier.
preferably, transistor amplifier comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd triode and the 4th triode, the positive pole of the 3rd resistance is connected to the positive output end of short-circuit protection circuit, the negative pole of the 3rd resistance is connected to the positive pole of the 4th resistance, the negative pole of the 4th resistance is connected to the emitter of the 4th triode, the base stage of the 4th triode, the positive pole of the base stage of the 3rd triode and the 6th resistance all is connected in the 3rd tie point, the collector and emitter of the 3rd triode all is connected to the positive output end of short-circuit protection circuit, the collector electrode of the 4th triode is connected to the positive pole of the 5th resistance, the negative pole of the 5th resistance is connected to the input of the 3rd isolation optocoupler, the output of the 3rd isolation optocoupler and the negative pole of the 6th resistance all are connected to the negative output terminal of short-circuit protection circuit.Preferably, the 3rd resistance comprises at least two resistance parallel with one another.
The utility model is owing to taking above-described technical scheme, it has the following advantages: guaranteeing fail-safe inherent characteristic and do not reducing under the prerequisite of fail safe of power-supply device circuit, improve power supply conversion efficiency, out-put supply is stabilized in a predetermined voltage range the most at last, and can carry out failure diagnosis to out-put supply by output voltage retaking of a year or grade and load current retaking of a year or grade function.
Description of drawings
Fig. 1 is the schematic diagram of the DC-DC power-supply device of prior art.
Fig. 2 is the schematic diagram according to DC-DC power-supply device of the present utility model.
Fig. 3 is the circuit diagram of the output voltage retaking of a year or grade circuit in Fig. 2.
Fig. 4 is the circuit diagram of the load current retaking of a year or grade circuit in Fig. 2.
Fig. 5 is the schematic diagram of the output circuit part in Fig. 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, method described in the utility model is described further.
Fig. 2 is the schematic diagram according to the DC-DC power-supply device of an execution mode of the present utility model.Fig. 5 is the schematic diagram of the output circuit part in Fig. 2.as Fig. 2 and shown in Figure 5, a kind of modified model failure safe DC-DC power-supply device, comprise: two-way control impuls input (being used for the two-way low-frequency pulse input 1 and 2 shown in access Fig. 2), the oscillating circuit power supply circuits 1 and 2 that are connected with separately control impuls input, the high frequency multi-resonant oscillating circuit that is connected with the output of being connected with two-way oscillating circuit power supply circuits 1 and the output voltage circuit that is connected with the output of high frequency multi-resonant oscillating circuit, the output voltage circuit comprises the amplifying circuit that connects in turn, the one MOS switching tube, the first isolating transformer, the first rectification and filter circuit, voltage stabilizing circuit and short-circuit protection circuit, the output of short-circuit protection circuit comprises positive output end and negative output terminal, this power-supply device also comprises:
The output voltage feedback circuit, it is connected between voltage stabilizing circuit and amplifying circuit, consist of a loop with amplifying circuit, a MOS switching tube, the first isolating transformer, the first rectification and filter circuit and voltage stabilizing circuit, be used for output voltage stabilization in predetermined voltage range.Selectively, can also comprise output voltage retaking of a year or grade circuit, it is connected to the output of short-circuit protection circuit, is used for reading the output voltage state.Selectively, can also comprise load current retaking of a year or grade circuit, it is connected to the output of short-circuit protection circuit, is used for reading the load current state.
Alternatively, the output voltage feedback circuit can comprise the first isolation optocoupler and the 2nd MOS switching tube, the input of the first isolation optocoupler is connected to the input of voltage stabilizing circuit, the input that the output of the first isolation optocoupler is connected to the 2nd MOS switching tube is used for driving the 2nd MOS switching tube, and the output of the 2nd MOS switching tube is connected to the output of amplifying circuit.
Alternatively, output voltage retaking of a year or grade circuit can comprise constant-current source circuit and the second isolation optocoupler of connecting with constant-current source circuit, and the input of constant-current source circuit is connected with the output of short-circuit protection circuit.
alternatively, constant-current source circuit can comprise the first triode Q1, the second triode Q2, the first resistance R 1 and the second resistance R 2, the collector electrode of the positive pole of the first resistance R 1 and the first triode Q1 all is connected to the positive output end of short-circuit protection circuit, the base stage of the first triode Q1, the collector electrode of the first resistance R 1 negative pole and the second triode Q2 all is connected in the first tie point A, the base stage of the second triode Q2, the positive pole of the emitter of the first triode Q1 and the 2nd R2 all is connected in the second tie point B, the emitter of the negative pole of the second resistance R 2 and the second triode Q2 all is connected to the input of the second isolation optocoupler, the output of the second isolation optocoupler is connected to the negative output terminal of short-circuit protection circuit.
Alternatively, load current retaking of a year or grade circuit can comprise transistor amplifier and the 3rd isolation optocoupler that is connected with transistor amplifier.
alternatively, transistor amplifier can comprise the 3rd resistance, the 4th resistance R 8, the 5th resistance R 9, the 6th resistance R 10, the 3rd triode Q3 and the 4th triode Q4, the positive pole of the 3rd resistance is connected to the positive output end of short-circuit protection circuit, the negative pole of the 3rd resistance is connected to the positive pole of the 4th resistance R 8, the negative pole of the 4th resistance R 8 is connected to the emitter of the 4th triode Q4, the base stage of the 4th triode Q4, the positive pole of the base stage of the 3rd triode Q3 and the 6th resistance R 10 all is connected in the 3rd tie point C, the collector and emitter of the 3rd triode Q3 all is connected to the positive output end of short-circuit protection circuit, the collector electrode of the 4th triode Q4 is connected to the positive pole of the 5th resistance R 9, the negative pole of the 5th resistance R 9 is connected to the input of the 3rd isolation optocoupler, the output of the 3rd isolation optocoupler and the negative pole of the 6th resistance R 10 all are connected to the negative output terminal of short-circuit protection circuit.Alternatively, the 3rd resistance comprises at least two resistance parallel with one another, and as shown in Figure 4, the 3rd resistance can comprise, for example, and three resistance R parallel with one another 5, R6, R7.
for the output voltage feedback circuit, when electric power output voltage during greater than desired operating voltage, make the optocoupler in parallel with the output voltage circuit (the first isolation optocoupler) conducting, the optocoupler output is used for driving a MOS switching tube (the 2nd MOS switching tube), after metal-oxide-semiconductor is opened, the front step voltage of amplifying circuit is pulled down to the conduction voltage drop (approximately about 1V～2.5V) of MOS switching tube, make amplifying circuit can't receive the high-frequency signal that high-frequency oscillating circuits produces, therefore the input switch signal of the first isolating transformer stops, the output voltage of the first isolating transformer begins to descend.When dropping to desired operating voltage when following, optocoupler can't conducting, make the MOS switching tube of optocoupler output turn-off, the high-frequency signal of high-frequency oscillating circuits can normally be input to amplifying circuit again, the input stage of the first isolating transformer begins normal operation, and the output voltage of the first isolating transformer rises again, so circulation feedback, reduced the power of circuit, the most at last in output voltage stabilization to a predetermined voltage range.
Fig. 3 is the circuit diagram of output voltage retaking of a year or grade circuit.As shown in Figure 3, when power supply has normal output 24VDC, triode Q1 is operated in the amplification region, triode Q2 is operated in the saturation region, can control through the optocoupler electric current of (second isolates optocoupler) by the resistance of adjusting the second resistance R 2, make the conducting of optocoupler output and can read output state by CPU.When power supply no-output voltage, triode Q1, Q2 all end, and make the optocoupler output turn-off.
Fig. 4 is the circuit diagram of load current retaking of a year or grade circuit.As shown in Figure 4, when power supply has output and all load is arranged, there is electric current to flow through from resistance R 5, R6, the R7 of parallel connection, make resistance left side voltage V1 greater than right side voltage V2, carry out the amplification of electric current by two triodes, make optocoupler (the 3rd isolation optocoupler) conducting and can read corresponding state by the CPU of rear end.
In whole improves the circuit design, because this power supply is an isolation DC-DC, so when out-put supply is carried out retaking of a year or grade, all use optocoupler to isolate, after the failure conditions such as output generation surge voltage, electric current, load changing, can not cause the CPU side to produce dependent failure, improve the reliability of circuit.In addition, after the arbitrary components and parts in the circuit of increase lost efficacy, all make power supply no-output voltage, the secure side of circuit still can be guaranteed.
Obviously, those skilled in the art deliberately carry out various changes and modification and do not break away from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model also is intended to comprise these changes and modification interior.
Claims (9)
1. modified model failure safe DC-DC power-supply device; comprise the output voltage circuit; described output voltage circuit comprises amplifying circuit, a MOS switching tube, the first isolating transformer, the first rectification and filter circuit, voltage stabilizing circuit and the short-circuit protection circuit that connects in turn; the output of described short-circuit protection circuit comprises positive output end and negative output terminal; it is characterized in that, also comprise:
The output voltage feedback circuit, it is connected between described voltage stabilizing circuit and described amplifying circuit, consists of a loop with described amplifying circuit, a described MOS switching tube, described the first isolating transformer, described the first rectification and filter circuit and described voltage stabilizing circuit.
2. power-supply device as claimed in claim 1, it is characterized in that: also comprise output voltage retaking of a year or grade circuit, it is connected to the output of described short-circuit protection circuit, is used for reading the output voltage state.
3. power-supply device as claimed in claim 1, it is characterized in that: also comprise load current retaking of a year or grade circuit, it is connected to the output of described short-circuit protection circuit, is used for reading the load current state.
4. the power-supply device described in the claims 1 to 3 any one, it is characterized in that: described output voltage feedback circuit comprises the first isolation optocoupler and the 2nd MOS switching tube, the input of described the first isolation optocoupler is connected to the input of described voltage stabilizing circuit, the output of described the first isolation optocoupler is connected to the input of described the 2nd MOS switching tube, and the output of described the 2nd MOS switching tube is connected to the output of described amplifying circuit.
5. power-supply device as claimed in claim 2; it is characterized in that: described output voltage retaking of a year or grade circuit comprises constant-current source circuit and the second isolation optocoupler of connecting with described constant-current source circuit, and the input of described constant-current source circuit is connected with the output of described short-circuit protection circuit.
6. power-supply device as claimed in claim 5, it is characterized in that: described constant-current source circuit comprises the first triode, the second triode, the first resistance and the second resistance, the collector electrode of the positive pole of described the first resistance and described the first triode all is connected to the positive output end of described short-circuit protection circuit, the base stage of described the first triode, the collector electrode of the negative pole of the first resistance and the second triode all is connected in the first tie point, the base stage of described the second triode, the positive pole of the emitter of the first triode and the second resistance all is connected in the second tie point, the emitter of the negative pole of described the second resistance and the second triode all is connected to the input of described the second isolation optocoupler, the output of described the second isolation optocoupler is connected to the negative output terminal of described short-circuit protection circuit.
7. power-supply device as claimed in claim 3 is characterized in that: described load current retaking of a year or grade circuit comprises transistor amplifier and the 3rd isolation optocoupler that is connected with described transistor amplifier.
8. power-supply device as claimed in claim 7, it is characterized in that: described transistor amplifier comprises the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd triode and the 4th triode, the positive pole of described the 3rd resistance is connected to the positive output end of described short-circuit protection circuit, the negative pole of described the 3rd resistance is connected to the positive pole of described the 4th resistance, the negative pole of described the 4th resistance is connected to the emitter of described the 4th triode, the base stage of described the 4th triode, the positive pole of the base stage of the 3rd triode and the 6th resistance all is connected in the 3rd tie point, the collector and emitter of described the 3rd triode all is connected to the positive output end of described short-circuit protection circuit, the collector electrode of described the 4th triode is connected to the positive pole of described the 5th resistance, the negative pole of described the 5th resistance is connected to the input of described the 3rd isolation optocoupler, the output of described the 3rd isolation optocoupler and the negative pole of the 6th resistance all are connected to the negative output terminal of described short-circuit protection circuit.
9. power-supply device as claimed in claim 8, it is characterized in that: described the 3rd resistance comprises at least two resistance parallel with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220450734.6U CN203014679U (en) | 2012-09-05 | 2012-09-05 | Improved fault safe DC-DC power supply equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220450734.6U CN203014679U (en) | 2012-09-05 | 2012-09-05 | Improved fault safe DC-DC power supply equipment |
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| Publication Number | Publication Date |
|---|---|
| CN203014679U true CN203014679U (en) | 2013-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220450734.6U Expired - Lifetime CN203014679U (en) | 2012-09-05 | 2012-09-05 | Improved fault safe DC-DC power supply equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302025A (en) * | 2015-11-16 | 2016-02-03 | 固安信通信号技术股份有限公司 | Safety output module |
| CN106817027A (en) * | 2016-09-21 | 2017-06-09 | 比亚迪股份有限公司 | Failure safe power supply and tractor-trailer train |
| CN109698619A (en) * | 2017-10-20 | 2019-04-30 | 湖南金杯新能源发展有限公司 | Load driving circuits and device |
-
2012
- 2012-09-05 CN CN201220450734.6U patent/CN203014679U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302025A (en) * | 2015-11-16 | 2016-02-03 | 固安信通信号技术股份有限公司 | Safety output module |
| CN105302025B (en) * | 2015-11-16 | 2018-02-06 | 固安信通信号技术股份有限公司 | Safety output module |
| CN106817027A (en) * | 2016-09-21 | 2017-06-09 | 比亚迪股份有限公司 | Failure safe power supply and tractor-trailer train |
| CN109698619A (en) * | 2017-10-20 | 2019-04-30 | 湖南金杯新能源发展有限公司 | Load driving circuits and device |
| CN109698619B (en) * | 2017-10-20 | 2020-06-23 | 湖南金杯新能源发展有限公司 | Load driving circuit and device |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130619 |