CN202918187U - High power switch power supply possessing soft start and fault protection - Google Patents
High power switch power supply possessing soft start and fault protection Download PDFInfo
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- CN202918187U CN202918187U CN 201220587822 CN201220587822U CN202918187U CN 202918187 U CN202918187 U CN 202918187U CN 201220587822 CN201220587822 CN 201220587822 CN 201220587822 U CN201220587822 U CN 201220587822U CN 202918187 U CN202918187 U CN 202918187U
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Abstract
The utility model discloses a high power switch power supply possessing soft start and fault protection, comprising a main power control circuit, a PWM control circuit, a soft start circuit, an over-current fault protection circuit and an overtemperature fault protection circuit. An output terminal of the soft start circuit is in connection with a starting terminal of the PWM control circuit; output terminals of the over-current fault protection circuit and the overtemperature fault protection circuit are respectively in connection with a fault control terminal of the PWM control circuit; a first optical coupler is connected between the overtemperature fault protection circuit and the fault control terminal of the PWM control circuit; a second optical coupler is connected between the over-current fault protection circuit and the fault control terminal of the PWM control circuit; a third optical coupler is connected between the soft start circuit and a starting terminal of the PWM control circuit. The high power switch power supply can avoid interference by changeable high voltage and heavy current in a main power circuit and realizes stable soft start and reliable overtemperature and over-current fault protection.
Description
Technical field
The utility model relates to a kind of Switching Power Supply, specifically a kind of high power switching power supply with soft start and error protection.
Background technology
As shown in Figure 1, existing high power switching power supply generally comprises the main power circuit of forceful electric power and the pwm control circuit of light current, the operating frequency of pwm control circuit output pulse width modulation signal (PWM) control main power circuit, the voltage signal of inputting from power input Vin is undertaken exporting at power output end Vout behind the power conversion by main power circuit; In order to ensure the work safety of high power switching power supply, power circuit is standing to be put soft starting circuit, over current fault protective circuit, overtemperature fault secure circuit and contactor Switching Power Supply is protected.
As shown in FIG., the pwm control circuit of this Switching Power Supply is that Master control chip and the peripheral circuit thereof of UC3879 forms by model mainly, soft starting circuit is connected to the power input Vin of Switching Power Supply and the start end of pwm control circuit, be between the SS end of UC3879 Master control chip, after Switching Power Supply powers on, soft starting circuit is just controlled it to pwm control circuit output logic high level and is started working through after certain charging interval, has realized the soft start of Switching Power Supply; The over current fault protective circuit is connected to the power input Vin of Switching Power Supply and the Fault Control end of pwm control circuit, be between the CS end of UC3879 Master control chip, the over current fault protective circuit is provided with Hall current sensor, this current sensor detects the operating current of dc bus, and the over current fault protective circuit is exported fault-signal to pwm control circuit when overcurrent, pwm control circuit quits work, until fault-signal disappearance pwm control circuit is just resumed work; The overtemperature fault secure circuit detects the temperature of main power circuit, its output is connected to the Fault Control end of pwm control circuit, it is the CS end of UC3879 Master control chip, when detecting the main control circuit overtemperature, the overtemperature fault secure circuit is exported fault-signal to pwm control circuit, pwm control circuit quits work, until fault-signal disappearance pwm control circuit is just resumed work; Contactor is connected on the dc bus of Switching Power Supply, and it is as power supply of Switching Power Supply input master switch, controls whole Switching Power Supply and starts or close.
The set-up mode of soft starting circuit, over current fault protective circuit, overtemperature fault secure circuit is simple in the above-mentioned high power switching power supply, but because when high power switching power supply is worked, switching tube in its main power circuit and diode high frequency switching meeting produce very large curent change di/dt, this is to its weak control circuit system, be that said PWM control circuit, soft starting circuit, over current fault protective circuit and overtemperature fault secure circuit can produce very strong electromagnetic interference, cause weak control circuit system cisco unity malfunction when serious; Particularly for the error protection in the weak control circuit and soft starting circuit, because its input signal is directly from main power circuit, the interference of the high pressure that is very easily wherein changed and large electric current.Therefore, existing high power switching power supply has the following disadvantages:
The first, overcurrent and overtemperature fault secure circuit are subjected to main power circuit to disturb frequent misoperation, and be especially more serious when the Switching Power Supply running status changes, and Switching Power Supply is difficult to continue normal operation;
The second, because soft starting circuit is disturbed by main power circuit, power is not level and smooth rising to Switching Power Supply in the starting process, but has the higher-order of oscillation, the Switching Power Supply unstable working condition in the process of starting that powers on.
The utility model content
The purpose of this utility model provides a kind of high power switching power supply with soft start and error protection, and the high pressure that can avoid changing in the main power circuit and large current interference realize stably soft start and reliably error protection.
The purpose of this utility model is achieved through the following technical measures:
A kind of high power switching power supply with soft start and error protection; comprise main power circuit; pwm control circuit; soft starting circuit; over current fault protective circuit and overtemperature fault secure circuit; the output of described soft starting circuit is connected to the start end of pwm control circuit; the output of described over current fault protective circuit and overtemperature fault secure circuit is connected respectively to the Fault Control end of pwm control circuit; be connected with the first optical coupler between the Fault Control end of described overtemperature fault secure circuit and pwm control circuit; be connected with the second optical coupler between the Fault Control end of described over current fault protective circuit and pwm control circuit, be connected with the 3rd optical coupler between the start end of described soft starting circuit and pwm control circuit.
As a kind of improvement of utility model, described high power switching power supply also comprises protection relay and as the contactor of high power switching power supply total power switch; The output of described the first optical coupler and the second optical coupler is divided into two-way; the first via output of these two optical couplers all is connected to the Fault Control end of pwm control circuit; the the second road output of the first optical coupler is connected to the input of described protection relay by the first Darlington triode; the the second road output of the second optical coupler is connected to the input of described protection relay by the second Darlington triode; the output of protection relay is connected with the control end of described contactor, and described contactor is connected on the dc bus of high power switching power supply.
As a kind of improvement of utility model, between described overtemperature fault secure circuit and the first optical coupler, all be connected with for input signal being amplified and the pretreated amplification of filtering interfering noise and filter circuit between described over current fault protective circuit and the second optical coupler.
As a kind of improvement of utility model, described high power switching power supply also comprises several indicator lights that are respectively applied to prompt switch power supply overtemperature, over current fault state and starting state; Described several indicator lights are connected respectively in the corresponding circuit.
As a kind of execution mode of utility model, described soft starting circuit comprises delay capacitor, the first divider resistance, the second divider resistance, the 3rd divider resistance, the 4th divider resistance, operational amplifier and diode; One end of the first divider resistance is the input of soft starting circuit, the other end of the first divider resistance is by the second divider resistance ground connection, the tie point of the first divider resistance and the second divider resistance is connected to the in-phase input end of operational amplifier, delay capacitor and the second divider resistance are in parallel, the input of soft starting circuit is by the 3rd divider resistance and the 4th divider resistance ground connection, the tie point of the 3rd divider resistance and the 4th divider resistance is connected to the inverting input of operational amplifier, the output of operational amplifier is connected with the anode of diode, and the negative electrode of diode is the output of soft starting circuit.
Compared with prior art, the utlity model has following beneficial effect:
First, the utility model adopts optical coupler that soft starting circuit, over current fault protective circuit, overtemperature fault secure circuit and pwm control circuit are carried out electrical isolation and signal transmission, greatly reduce the possibility of phase mutual interference and coupling between them, therefore anti-strong electromagnetic ability of the present utility model is stronger, can significantly reduce the false alarm of overcurrent and overtemperature fault and leak alarm rate, and can realize smooth start, and starting process is level and smooth, so that the reliability of Switching Power Supply is greatly improved;
Second, the utility model adopts Darlington triode that enough voltage, current drives protection relays are provided, when Switching Power Supply generation overtemperature or over current fault, disconnect contactor in the main power circuit by protection relay, Switching Power Supply is shut down, pending fault is got rid of, after PWM drove signal and recovers, the use safety of Switching Power Supply had further been guaranteed in the starting of just can again starting shooting;
Description of drawings
The utility model is described in further detail below in conjunction with the drawings and specific embodiments:
Fig. 1 is the schematic block circuit diagram of high power switching power supply in the prior art;
Fig. 2 is the schematic block circuit diagram of the utility model high power switching power supply;
Fig. 3 is the circuit theory diagrams of soft starting circuit in the utility model;
Fig. 4 is the circuit theory diagrams of optical coupling isolation circuit in the utility model, Darlington triode array interface circuit and protection relay;
Fig. 5 is the circuit theory diagrams of pwm control circuit in the utility model.
Embodiment
Extremely shown in Figure 5 such as Fig. 2; high power switching power supply with soft start and error protection of the present utility model comprises main power circuit, pwm control circuit, soft starting circuit, over current fault protective circuit, overtemperature fault secure circuit, optical coupling isolation circuit, Darlington triode array interface circuit, protection relay, contactor and indicator light circuit.Wherein, the utility model is all identical with connected mode and the operation principle of main power circuit, pwm control circuit, soft starting circuit, over current fault protective circuit, overtemperature fault secure circuit and the contactor of the high power switching power supply of prior art shown in Figure 1, does not repeat them here.
Referring to Fig. 3, soft starting circuit of the present utility model comprises delay capacitor C48, the first divider resistance R87, the second divider resistance R88, the 3rd divider resistance R89, the 4th divider resistance R90, operational amplifier U13A and diode D37; The end of the first divider resistance R87 is the input of soft starting circuit, the other end of the first divider resistance R87 is by the second divider resistance R88 ground connection, the tie point of the first divider resistance R87 and the second divider resistance R88 is connected to the in-phase input end of operational amplifier U13A, delay capacitor C48 and the second divider resistance R88 are in parallel, the input of soft starting circuit is by the 3rd divider resistance R89 and the 4th divider resistance R90 ground connection, the tie point of the 3rd divider resistance R89 and the 4th divider resistance R90 is connected to the inverting input of operational amplifier U13A, the output of operational amplifier U13A is connected with the anode of diode D37, and the negative electrode of diode D37 is the output Softstart of soft starting circuit.At the Switching Power Supply powered on moment, the inverting input of operational amplifier U13A rises to 8.6V immediately, and the in-phase input end current potential has a charging rise time owing to the reason that capacitor C 48 is arranged, the output level of operational amplifier U13A is low level at this moment, after capacitor C 48 is full of electricity, the in-phase input end current potential rises to 9V, operational amplifier U13A upset, soft starting circuit output high level.
Over current fault protective circuit of the present utility model; overtemperature fault secure circuit and main power circuit adopt circuit form commonly used in the prior art; the overtemperature fault secure circuit is by adopting the peak temperature of IGBT module in the temperature sensor monitors main power circuit; its output T_measure output overtemperature error protection signal; normally closed under the temperature sensor normal condition; the overtemperature error protection signal of its output T_measure output keeps low level under the normal condition; the desired temperature that surpasses temperature sensor when the monitoring point temperature; the temperature sensor action; the overtemperature error protection signal saltus step of its output T_measure output is high level, sends the overtemperature alarm signal.The over current fault protective circuit is by adopting the electric current on the Hall current sensor monitoring switch power DC bus; the output I_measure output overcurrent error protection signal of over current fault protective circuit; the amplitude of this over-current detection signal is directly proportional with dc bus current; when it increases to certain amplitude; the overcurrent protection action, the over current fault guard signal saltus step of the output I_measure output of over current fault protective circuit is high level.
Referring to Fig. 4, optical coupling isolation circuit of the present utility model comprises the first optical coupler U1, the second optical coupler U2 and the 3rd optical coupler U3; Darlington triode array interface circuit of the present utility model comprises the first Darlington triode and the second Darlington triode; they select model is the interface chip U5 realization of ULN2803; protection relay of the present utility model is comprised of four relay K 1 ~ K4; indicator light circuit of the present utility model comprises four indicator light LED1 ~ LED4 that are respectively applied to prompt switch power supply overtemperature, over current fault state and starting state, and these four indicator lights are connected respectively on the corresponding circuit interface.
Contactor of the present utility model is connected on the dc bus of high power switching power supply as the high power switching power supply total power switch; The output T_measure of above-mentioned overtemperature fault secure circuit; the output I_measure of over current fault protective circuit and the output Softstart of soft starting circuit access respectively the first optical coupler U1; the input of the second optical coupler U2 and the 3rd optical coupler U3; the output of the first optical coupler U1 and the second optical coupler U2 is divided into two-way; the first via output CTR2 of these two optical couplers all is connected to the Fault Control end CS of pwm control circuit; the the second road output of the first optical coupler U1 is connected to the input of protection relay by the first Darlington triode; the the second road output of the second optical coupler U2 is connected to the input of protection relay by the second Darlington triode, the output of protection relay is connected with the control end of contactor by interface X1.In addition, in order to provide enough drive currents for the pwm control circuit soft start, and take full advantage of the resource of ULN2803 interface chip U5, the output Softstart of above-mentioned soft starting circuit is linked into the start end SS of pwm control circuit after by a Darlington triode among the ULN2803 interface chip U5 again, i.e. the SS of UC3879 Master control chip end.
Referring to Fig. 5, pwm control circuit of the present utility model is that Master control chip U9 and the peripheral circuit thereof of UC3879 forms by model, the signal of the output Softstart output of above-mentioned soft starting circuit is linked into the start end SS of UC3879 Master control chip U9 through optocoupler and Darlington triode, when the Switching Power Supply electrifying startup, the current potential of start end SS smoothly rises along a slope, the PWM of control pwm control circuit output drives signal smoothing phase shift, the impulse current of avoiding starting process to cause.After the signal of the output T_measure of above-mentioned overtemperature fault secure circuit and the output I_measure of over current fault protective circuit output was isolated through optical coupling isolation circuit, the one tunnel accessed respectively the error protection signal input CS end of UC3879 Master control chip U9; When normal condition, the CS terminal potential is that four road pwm signals of 0, UC3879 Master control chip U9 are normally exported; When having overtemperature or over current fault to occur, the CS terminal potential becomes height, and four road pwm signals of UC3879 Master control chip U9 are blocked, and make the IGBT switching tube reliable turn-off in the main power circuit; Simultaneously; after the signal of the output T_measure of above-mentioned overtemperature fault secure circuit and the output I_measure of over current fault protective circuit output is isolated through optical coupling isolation circuit; another road drives the protection relay action by the Darlington triode array circuit; disconnect the contactor in the power main circuit; Switching Power Supply is shut down, and pending fault is got rid of, after PWM drives the signal recovery; the use safety of Switching Power Supply has further been guaranteed in the starting of just can again starting shooting.
In addition; between the utility model overtemperature fault secure circuit and the first optical coupler U1, all be connected with for input signal being amplified and the pretreated amplification of filtering interfering noise and filter circuit between over current fault protective circuit and the second optical coupler U2, this amplification and filter circuit can adopt amplifying circuit commonly used and filter circuit to connect to form.
The utility model does not limit to and above-mentioned embodiment; according to foregoing; ordinary skill knowledge and customary means according to this area; do not breaking away under the above-mentioned basic fundamental thought of the utility model prerequisite; the utility model can also be made equivalent modifications, replacement or the change of other various ways, all drops among the protection range of the present utility model.
Claims (5)
1. high power switching power supply with soft start and error protection; comprise main power circuit; pwm control circuit; soft starting circuit; over current fault protective circuit and overtemperature fault secure circuit; the output of described soft starting circuit is connected to the start end (SS) of pwm control circuit; the output of described over current fault protective circuit and overtemperature fault secure circuit is connected respectively to the Fault Control end (CS) of pwm control circuit; it is characterized in that: be connected with the first optical coupler (U1) between the Fault Control end (CS) of described overtemperature fault secure circuit and pwm control circuit; be connected with the second optical coupler (U2) between the Fault Control end (CS) of described over current fault protective circuit and pwm control circuit, be connected with the 3rd optical coupler (U3) between the start end of described soft starting circuit and pwm control circuit (SS).
2. the high power switching power supply with soft start and error protection according to claim 1 is characterized in that: described high power switching power supply also comprises protection relay and as the contactor of high power switching power supply total power switch; The output of described the first optical coupler (U1) and the second optical coupler (U2) is divided into two-way; the first via output of these two optical couplers all is connected to the Fault Control end (CS) of pwm control circuit; the the second road output of the first optical coupler (U1) is connected to the input of described protection relay by the first Darlington triode; the the second road output of the second optical coupler (U2) is connected to the input of described protection relay by the second Darlington triode; the output of protection relay is connected with the control end of described contactor, and described contactor is connected on the dc bus of high power switching power supply.
3. the high power switching power supply with soft start and error protection according to claim 1 and 2 is characterized in that: between described overtemperature fault secure circuit and the first optical coupler (U1), all be connected with for input signal being amplified and the pretreated amplification of filtering interfering noise and filter circuit between described over current fault protective circuit and the second optical coupler (U2).
4. the high power switching power supply with soft start and error protection according to claim 3, it is characterized in that: described high power switching power supply also comprises several indicator lights that are respectively applied to prompt switch power supply overtemperature, over current fault state and starting state; Described several indicator lights are connected respectively in the corresponding circuit.
5. the high power switching power supply with soft start and error protection according to claim 4, it is characterized in that: described soft starting circuit comprises delay capacitor (C48), the first divider resistance (R87), the second divider resistance (R88), the 3rd divider resistance (R89), the 4th divider resistance (R90), operational amplifier (U13A) and diode (D37); One end of the first divider resistance (R87) is the input of soft starting circuit, the other end of the first divider resistance (R87) is by the second divider resistance (R88) ground connection, the tie point of the first divider resistance (R87) and the second divider resistance (R88) is connected to the in-phase input end of operational amplifier (U13A), delay capacitor (C48) is in parallel with the second divider resistance (R88), the input of soft starting circuit is by the 3rd divider resistance (R89) and the 4th divider resistance (R90) ground connection, the tie point of the 3rd divider resistance (R89) and the 4th divider resistance (R90) is connected to the inverting input of operational amplifier (U13A), the output of operational amplifier (U13A) is connected with the anode of diode (D37), and the negative electrode of diode (D37) is the output of soft starting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220587822 CN202918187U (en) | 2012-11-08 | 2012-11-08 | High power switch power supply possessing soft start and fault protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220587822 CN202918187U (en) | 2012-11-08 | 2012-11-08 | High power switch power supply possessing soft start and fault protection |
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| CN202918187U true CN202918187U (en) | 2013-05-01 |
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| CN 201220587822 Expired - Fee Related CN202918187U (en) | 2012-11-08 | 2012-11-08 | High power switch power supply possessing soft start and fault protection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716820A (en) * | 2013-12-11 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Soft start and direct-current voltage conversion circuit and electronic device |
| CN106081260A (en) * | 2016-06-17 | 2016-11-09 | 浙江万事发纺织机械有限公司 | A kind of control system for sewing thread automatic packaging machine |
| CN107769527A (en) * | 2017-12-07 | 2018-03-06 | 成都爱特联科技有限公司 | A kind of control circuit |
| CN109449050A (en) * | 2018-11-16 | 2019-03-08 | 丹东星光电器有限公司 | Energy-saving safety starter relay magnet control electromagnetic system |
-
2012
- 2012-11-08 CN CN 201220587822 patent/CN202918187U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716820A (en) * | 2013-12-11 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Soft start and direct-current voltage conversion circuit and electronic device |
| CN106081260A (en) * | 2016-06-17 | 2016-11-09 | 浙江万事发纺织机械有限公司 | A kind of control system for sewing thread automatic packaging machine |
| CN106081260B (en) * | 2016-06-17 | 2018-10-16 | 浙江万事发纺织机械有限公司 | A kind of control system for sewing thread automatic packaging machine |
| CN107769527A (en) * | 2017-12-07 | 2018-03-06 | 成都爱特联科技有限公司 | A kind of control circuit |
| CN109449050A (en) * | 2018-11-16 | 2019-03-08 | 丹东星光电器有限公司 | Energy-saving safety starter relay magnet control electromagnetic system |
| CN109449050B (en) * | 2018-11-16 | 2023-08-25 | 丹东星光电器有限公司 | Electromagnet control electromagnetic system of energy-saving safety starting relay |
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Effective date of registration: 20131126 Address after: Shiling Town, Huadu District, Guangzhou City, Guangdong province 511450 Yufeng Road No. 16 Patentee after: Qingtian Industry Co., Ltd., Guangzhou Address before: 510302 Xingang West Road, Guangdong, China, No. 204, No. Patentee before: China National Electric Apparatus Research Institute Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20201108 |
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