CN201466986U - Switching power supplying device with function of preventing surging - Google Patents
Switching power supplying device with function of preventing surging Download PDFInfo
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- CN201466986U CN201466986U CN200920071731XU CN200920071731U CN201466986U CN 201466986 U CN201466986 U CN 201466986U CN 200920071731X U CN200920071731X U CN 200920071731XU CN 200920071731 U CN200920071731 U CN 200920071731U CN 201466986 U CN201466986 U CN 201466986U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model relates to a switching power supplying device with the function of preventing surging, which mainly comprises a switching power supply circuit, a direct current power supply transformation circuit and an overvoltage and over-current protecting circuit, wherein the direct current power supply transformation circuit provides a first direct current working power supply, a second direct current working power supply and a standby direct current power supply, when the overvoltage and over-current protecting circuit executes overvoltage or over-current protection or receives external shut-off signals, high voltage surging can be generated and the direct current power supply transformation circuit is fed back through the output end of the first direct current working power supply, since the output end of the first direct current working supply is connected to the output end of a second direct current working power supply through an inversed diode, the high voltage surging can not affect the output end of a second direct current power supply, then assemblies connected to the output end of the second direct current power supply can not be damaged, thereby the service life of the switching power supplying device can be prolonged.
Description
Technical field
The utility model relates to a kind of switched power supplier, particularly relates to the switched power supplier that a kind of tool prevents the surging function.
Background technology
See also shown in Fig. 4 A, 4B and the 4C, be a kind of circuit diagram of existing switched power supplier, it includes:
One exchangeable type power supply circuit 50, it includes a current rectifying and wave filtering circuit, one power factor correction circuit, one direct current is to a direct-current power supply converting circuit and a signal feedback circuit, wherein this rectified wave circuit is connected to an AC power, to export a high-voltage dc signal after its rectification and the filtering to this power factor correction circuit, by power factor correction circuit voltage and current signal phase place are adjusted homophase again, improve the power factor of high-voltage dc signal, by this direct current direct-current power supply converting circuit basis signal feedback circuit is replied the change in voltage of low-voltage direct output afterwards again, and this high-voltage dc signal is given step-down, and voltage stabilizing is exported at least one group of low-voltage dc signal to corresponding low-voltage direct output;
One direct current power-switching circuit 60, be connected to the output B+ of the power factor correction circuit of this exchangeable type power supply circuit 50, and include a primary side control circuit, an one transformer T2 and a switching circuit 602, wherein this primary side control circuit is converted to a direct current working power VCCP with the high-voltage DC power supply step-down, primary side current size at control transformer T2, make secondary side step-down and the voltage stabilizing of transformer T2 export a standby DC power supply+5VS, wherein this dc supply VCCP exports the power end VCC of this power factor correction circuit to by this switching circuit 602; And
One overvoltage circuit overcurrent protection 70 is series on the electric power loop of exchangeable type power supply circuit 50; Wherein this overvoltage circuit overcurrent protection 70 includes an error protection output FPOB (PIN3) and an external control end ON_OFF (PIN4), and this error protection output FPOB (PIN3) is connected to the control end of switching circuit 602.This overvoltage circuit overcurrent protection 70 mainly has overvoltage or over-current state in order to judgement; or receive outside starting-up signal in order to receive external control end ON_OFF (PIN4); when judgement has overvoltage or over-current state or accepts off signal; its error protection output FPOB (PIN3) can export low-potential signal to close this switching circuit 602; and make the working power VCC of power factor correction circuit interrupt, so exchangeable type power supply circuit output DC source no longer.
Moreover, the primary side control circuit of above-mentioned this direct-current power supply converting circuit 60 mainly comprises one first diode D61, one second diode D63, a controller M6 and a capacitor C 64, wherein this first diode D61 and the first capacitor C 64 primary side power supply that receives these transformers gives rectifying and wave-filtering and becomes dc supply VCCP, again, this dc supply VCCP is connected to the power end of controller M6 by the second diode D63 forward, so that this controller M6 to be provided working power.
Yet the design of the primary side control circuit of above-mentioned direct-current power supply converting circuit 60 can be judged when having overvoltage or over-current state or external control end ON_OFF (PIN4) to receive outside starting-up signal and damages at this overvoltage circuit overcurrent protection 70.Because the external control end ON_OFF (PIN4) of overvoltage circuit overcurrent protection 70 receives a low-potential signal; and then error protection output FPOB (PIN3) also can export low-potential signal and closes this switching circuit 602; have a high pressure surging and produce this moment; and this high pressure surging can feed back the primary side control circuit of this direct-current power supply converting circuit 60; again because controller M6 is connected with dc supply VCCP with the second diode D63 forward; so the high pressure surging can pour into the power end of controller M6 along the second diode D63; and then damage this controller M6, make switched power supplier to move.
Summary of the invention
Have and state the shortcoming that switched power supplier can't prevent surging in view of this, the utility model provides a kind of tool to prevent the switched power supplier of surging function, the surging that makes in the circuit being produced can not cause the infringement of assembly in the circuit, and then improves the useful life of this switching power supply device.
Desiring to reach the employed major technique means of above-mentioned purpose is to make this switched power supplier include:
One exchangeable type power supply circuit, include one first primary side control circuit and one first transformer, after wherein this first primary side control circuit is converted to a high-voltage DC power supply with an AC power, provide to this first transformer primary side, control this first transformer primary side current size again, make the secondary side step-down of this first transformer and voltage stabilizing export at least one group of low-voltage dc signal to corresponding low-voltage direct output;
One direct current power-switching circuit is connected to the high-voltage DC power supply of this exchangeable type power supply circuit, and the DC high-voltage power supply step-down is become three groups of DC power supply outputs, is respectively first dc supply, second dc supply and a standby DC power supply; Wherein this direct-current power supply converting circuit comprises one second primary side control circuit, one second transformer and a switching circuit; Wherein this this second transformer comprises primary side, secondary side and an induction coil, and this primary side is connected to DC high-voltage power supply, and this induction coil induction primary side current signal is to form induced current again; This second primary side control circuit wherein mainly comprises one first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit and one first controller again; Wherein this first controller is connected with this second transformer primary side, controls this primary side current size, to export this dc standby power in secondary side; Wherein this first current rectifying and wave filtering circuit comprises one first diode and first electric capacity, the induction coil of this second transformer is connected in series this first diode and first electric capacity, form rectification filtering circuit, to be first dc supply, this first dc supply output is connected to switching circuit to supply with the exchangeable type power supply circuit first primary side control circuit working power with the induced current rectifying and wave-filtering; This second current rectifying and wave filtering circuit comprises one second diode and second electric capacity, the induction coil of this second transformer is connected in series this second diode and second electric capacity, form another rectification filtering circuit, to be second dc supply with the induction coil rectifying and wave-filtering, this second dc supply output is connected to the power end of this first controller; And
One overvoltage circuit overcurrent protection, be series on the electric power loop of exchangeable type power supply circuit, with the voltage and the current status of the low-voltage dc signal that detects exchangeable type power supply circuit, even and when judgement has overvoltage and over-current state to produce exchangeable type power supply circuit stop power supply; Wherein this overvoltage circuit overcurrent protection includes an error protection output FPOB (PIN3) and an external control end ON_OFF (PIN4), and this error protection output FPOB (PIN3) is connected to the control end of switching circuit.When this overvoltage circuit overcurrent protection judgement has overvoltage or over-current state or external control end ON_OFF (PIN4) to receive outside off signal, this error protection output FPOB (PIN3) can close this switching circuit by the output low-potential signal, have a high pressure surging and produce this moment, and this high pressure surging can feed back to the first dc supply output, but be reverse because connect from this first diode of induction coil of this first dc supply output to the second transformer, so a feedback high pressure surging can be by the induction coil of first diode to the second transformer, so the high pressure surging can not feed back to second current rectifying and wave filtering circuit, promptly do not influence second dc supply, therefore be connected to this power end with this second dc supply output to this first controller, can not cause damage because of the high pressure surging that is produced, the switched power supplier circuit can continue regular event; Therefore, the useful life of the utility model switched power supplier that can provide.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 A, 2B and 2C are detailed circuit diagram of the present utility model;
Fig. 3 is an oscillogram of the present utility model; And
Fig. 4 A, 4B and 4C are the detailed circuit diagram of existing switched power supplier.
Embodiment
Below cooperate preferred embodiment graphic and of the present utility model, further setting forth the utility model is to reach the technological means that predetermined creation purpose is taked.
See also shown in Fig. 1 and Fig. 2 A, 2B and the 2C, be the circuit block diagram of this practical case, it includes:
One exchangeable type power supply circuit 10, include one first primary side control circuit and the first transformer T1, after wherein this first primary side control circuit is converted to a high-voltage DC power supply B+ with an AC power, the primary side to this first transformer T1 is provided, control the first transformer T1 primary side current size again, make the secondary side step-down of the first transformer T1 and voltage stabilizing export at least one group of low-voltage dc signal (+12V) (+5V) (+3.3V) to corresponding low-voltage direct output;
One direct current power-switching circuit 101, be connected to the high-voltage DC power supply B+ of this exchangeable type power supply circuit 10, DC high-voltage power supply B+ step-down is become three groups of DC power supply outputs, be respectively the first dc supply VCCP1, the second dc supply VCCP2 and a standby DC power supply+5VS, wherein this direct-current power supply converting circuit 101 comprises one second primary side control circuit, one second a transformer T2 and a switching circuit 102, wherein this second transformer T2 comprises primary side T21, a secondary side T22 and an induction coil T23, this primary side T21 is connected to DC high-voltage power supply B+, and this induction coil T23 induction primary side current signal is to form induced current again; This second primary side control circuit wherein mainly comprises one first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit and one first controller M5, wherein this first controller M5 is connected with this second transformer T2 primary side T21, control this primary side current size, to export this standby DC power supply+5VS in secondary side T22; This first current rectifying and wave filtering circuit comprises the one first diode D11 and first capacitor C 34, the induction coil T23 of this second transformer T2 is connected in series this first diode D11 and first capacitor C 34, form rectification filtering circuit, to be the first dc supply VCCP1 with the induced current rectifying and wave-filtering, this first dc supply output (VCCP1) is connected to switching circuit 102 to supply with exchangeable type power supply circuit 10 first primary side control circuit working powers; This second current rectifying and wave filtering circuit comprises the one second diode D13 and second capacitor C 55, the induction coil T23 of this second transformer T2 is connected in series this second diode D13 and second capacitor C 55, form another rectification filtering circuit, being the second dc supply VCCP2, and this second dc supply output (VCCP2) is connected to this power end to the first controller M5 with induction coil T23 rectifying and wave-filtering; And
One overvoltage circuit overcurrent protection 20, be series on the electric power loop of this direct-current power supply converting circuit 101 and first primary side control circuit of this exchangeable type power supply circuit 10, voltage and current status with the low-voltage dc signal that detects exchangeable type power supply circuit 10, and when judgement has overvoltage and over-current state to produce, control direct-current power supply converting circuit 101 and stop to export the primary side control circuit of dc supply VCCP to exchangeable type power supply circuit 10, close exchangeable type power supply circuit 10 output low-voltage dc signals simultaneously; Wherein this overvoltage circuit overcurrent protection 20 includes an error protection output FPOB (PIN3) and an external control end ON_OFF (PIN4).
The primary side control circuit of above-mentioned exchangeable type power supply circuit 10 includes:
One current rectifying and wave filtering circuit 11, it is connected to an AC power, with output one high-voltage dc signal after its rectification and the filtering;
One power factor correction circuit 12, it is connected to the output of this current rectifying and wave filtering circuit 11, so that voltage and current signal phase place are adjusted homophase, improves the power factor of high-voltage dc signal; This power factor correction circuit 12 is booster circuits in present embodiment, so with the high-voltage dc signal back output high-voltage DC power supply B+ that boosted again;
One direct current is to direct-current power supply converting circuit 13, and the output that it is connected to this power factor correction circuit 12 gives step-down with high-voltage dc signal, and voltage stabilizing is exported at least one group of low-voltage dc signal to corresponding low-voltage direct output; And
One signal feedback circuit 14, it is connected to the low-voltage direct output of this direct current to direct-current power supply converting circuit 13, the reaction of low-voltage direct output voltage is given this direct current to direct-current power supply converting circuit 13, direct-current power supply converting circuit 13 is stablized its low-voltage dc signal voltage for direct current.
In present embodiment, this power factor correction circuit 12 is shared single PWM controller M2 with this direct current to direct-current power supply converting circuit 13, also can use two PWM controller respectively, the power end VCC of this single PWM controller M2 is connected to the first dc supply output (VCCP1) of this direct-current power supply converting circuit 101 by a switching circuit 102 again.
This direct-current power supply converting circuit 101 is connected to the high-voltage DC power supply B+ of the power factor correction circuit 12 of this exchangeable type power supply circuit 10, is three groups of DC power supply outputs such as the first dc supply VCCP1, the second dc supply VCCP2 and a standby DC power supply+5VS with the high-voltage dc signal step-down; This direct-current power supply converting circuit 101 is a flyback power circuit in present embodiment.Because this high-voltage DC power supply B+ obtains from these current rectifying and wave filtering circuit 11 outputs, so work as AC power just often, this direct-current power supply converting circuit 101 can continue to provide the first dc supply VCCP1, the second dc supply VCCP2 and standby DC power supply+5VS.
Moreover, switching circuit 102 between the above-mentioned PWM controller M2 electric power loop that is serially connected in these direct current power supply unit 101 outputs and power factor correction circuit 12 and DC power supply circuit is the power end VCC that whether the first dc supply VCCP1 of these direct-current power supply converting circuit 101 outputs exported to this PWM controller M2 in order to decision; The control end of this switching circuit 102 is connected to this overvoltage current protecting circuit 20 again, by the keying of these overvoltage current protecting circuit 20 determine switch circuit 102.In present embodiment; this switching circuit 102 mainly is made up of an electronic switch (PNP transistor) 1021; its base stage is control end and controls signal to base stage when this overvoltage current protecting circuit 20 output electronegative potentials; this electronic switch 1021 is with not conducting; at this moment; be serially connected with first direct-current working volts VCCP1 of this direct current power supply unit 101 and the not conducting electronic switch 1021 between the PWM controller M2 working power end VCC, promptly interrupt the working power of PWM controller M2.
Again, above-mentioned overvoltage current protecting circuit 20 includes: one second controller M1, a RC filter circuit R51/C30 and a buffer circuit M8.
Above-mentioned this controller M1 can be WT7515 model or WT7527 model integrated circuit, present embodiment adopts WT7527 model integrated circuit that it is described, it includes the good output PGO of a power supply (PIN16), one external signal input PSONB (PIN4), one power supply detects end PGI, one voltage induced end VS12A, an one induction by current end IS12A and a power supply status output the PG. wherein good output PGO of this power supply (PIN16) pass through a RC circuit (R32, C27) be connected to above-mentioned power supply status output PG, this external signal input PSONB (PIN4) then is connected to said external control end ON_OFF, this power supply detects end PGI is connected to transformer T1 in the DC power supply circuit 13 that exchanges power circuit 10 by this RC filter circuit R51/C30 secondary side again, to obtain the size of current of present secondary side, again this voltage induced end VS12A and induction by current end IS12A be connected to the DC power supply circuit 13 of exchangeable type power supply circuit 10 wherein one group of low-voltage direct output (+12V), with output voltage and the size of current that obtains present switched power supplier 10, it is an optical coupler that this error protection output FPOB then is connected to this buffer circuit M8. this buffer circuit M8 in present embodiment, and this error protection output FPOB is connected to the light-emitting diode of this buffer circuit M8, and the photistor of this buffer circuit M8 then is connected to the control end of this switching circuit 102; This external control end ON_OFF is then for the external control signal input in addition. see also shown in Figure 3, when this external control signal ON_OFF will input to this external signal input PSONB from the shutdown of motherboard one electronegative potential after a period of time, this error protection output FPOB can export an electronegative potential control signal, again after a period of time, the good output PG of this power supply no longer is connected to electronegative potential (ground connection), this moment, this PG can be by the RC circuit to (R32 C27) is connected to+the 5VS high potential signal; In addition, when power supply detected end PGI, voltage induced end VS12A, induction by current end IS12A or the change of external control end ON_OFF state, this error protection output FPOB can be by the control signal of buffer circuit M8 output height different potentials.
From the above; when these overvoltage current protecting circuit 20 judgements have overcurrent overvoltage or external control signal to receive an off signal (low-potential signal); this error protection output FPOB can export a low pressure current potential signal at stop electronic switch 1021; this was closed electronic switch 1021 and can cause a high pressure surging and feed back to the first dc supply output (VCCP1) this moment; but be reverse because of connecing from this first diode of induction coil T23 D11 of this first dc supply output to the second transformer T2; so a feedback high pressure surging can be by the induction coil T23 of first diode D11 to the second transformer T2; so the high pressure surging can not feed back to second current rectifying and wave filtering circuit; promptly do not influence second dc supply; so power end of the first controller M5 that is connected with this second dc supply output (VCCP2); can not cause damage because of the high pressure surging that is produced; the switched power supplier circuit can continue regular event, and then can improve the useful life of this switched power supplier.
The above only is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, though the utility model discloses as above with preferred embodiment, yet be not in order to limit the utility model, any those skilled in the art, in the scope that does not break away from technical solutions of the utility model, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, according to technical spirit of the present utility model to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solutions of the utility model.
Claims (9)
1. a tool prevents the switched power supplier of surging function, it is characterized in that, includes:
One exchangeable type power supply circuit, include one first primary side control circuit and one first transformer, after wherein this first primary side control circuit is converted to a high-voltage DC power supply with an AC power, provide to this first transformer primary side, control this first transformer primary side current size again, make the secondary side step-down of this first transformer and voltage stabilizing export at least one group of low-voltage dc signal to corresponding low-voltage direct output;
One direct current power-switching circuit is connected to the high-voltage DC power supply of this exchangeable type power supply circuit, and the DC high-voltage power supply step-down is become three groups of DC power supply outputs, is respectively first dc supply, second dc supply and a standby DC power supply; Wherein this direct-current power supply converting circuit comprises one second primary side control circuit, one second transformer and a switching circuit; Wherein this second transformer comprises primary side, secondary side and an induction coil, and this primary side is connected to DC high-voltage power supply, and this induction coil induction primary side current signal is to form induced current again; This second primary side control circuit wherein mainly comprises one first current rectifying and wave filtering circuit, second current rectifying and wave filtering circuit and one first controller again; Wherein this first controller is connected with this second transformer primary side, controls this primary side current size, to export this standby DC power supply in secondary side; Wherein this first current rectifying and wave filtering circuit comprises one first diode and first electric capacity, the induction coil of this second transformer is connected in series this first diode and first electric capacity, form rectification filtering circuit, to be first dc supply, this first dc supply output is connected to switching circuit to supply with the exchangeable type power supply circuit first primary side control circuit working power with the induced current rectifying and wave-filtering; This second current rectifying and wave filtering circuit comprises one second diode and second electric capacity, the induction coil of this second transformer is connected in series this second diode and second electric capacity, form another rectification filtering circuit, to be second dc supply with the induction coil rectifying and wave-filtering, this second dc supply output is connected to the power end of this first controller; And
One overvoltage circuit overcurrent protection, be series on the electric power loop of primary side control circuit of this direct-current power supply converting circuit and this exchangeable type power supply circuit, voltage and current status with the low-voltage dc signal that detects exchangeable type power supply circuit, and when judgement has overvoltage and over-current state to produce, control direct-current power supply converting circuit and stop to export the primary side control circuit of dc supply to exchangeable type power supply circuit, close exchangeable type power supply circuit output low-voltage dc signal simultaneously; Wherein this overvoltage circuit overcurrent protection includes an error protection output and an external control end.
2. tool according to claim 1 prevents the switched power supplier of surging function, it is characterized in that, this exchangeable type power supply circuit includes:
One current rectifying and wave filtering circuit, it is connected to an AC power, with output one high-voltage dc signal after its rectification and the filtering;
One power factor correction circuit, it is connected to the output of this current rectifying and wave filtering circuit, so that voltage and current signal phase place are adjusted homophase, improves the power factor of high-voltage dc signal;
One direct current is to direct-current power supply converting circuit, and the output that it is connected to this power factor correction circuit gives step-down with high-voltage dc signal, and extremely corresponding low-voltage direct output of at least one group of low-voltage dc signal is exported in voltage stabilizing: and
One signal feedback circuit, it is connected to the low-voltage direct output of this direct current to direct-current power supply converting circuit, the reaction of low-voltage direct output voltage is given this direct current to direct-current power supply converting circuit, direct-current power supply converting circuit is stablized its low-voltage dc signal voltage for direct current.
3. tool according to claim 2 prevents the switched power supplier of surging function, it is characterized in that, this power factor correction circuit is a booster circuit.
4. tool according to claim 3 prevents the switched power supplier of surging function, it is characterized in that the first dc supply output of this direct-current power supply converting circuit is connected to the power end of a PWM controller of this power factor correction circuit by a switching circuit.
5. tool according to claim 4 prevents the switched power supplier of surging function, it is characterized in that, this direct-current power supply converting circuit is a flyback power circuit.
6. tool according to claim 5 prevents the switched power supplier of surging function, it is characterized in that, this overvoltage current protecting circuit includes:
One controller includes a power supply and detects end, an induction by current end, an induction by current end, a power supply status output, this error protection output and this external control end; This power supply detects end is connected to the exchange power circuit by a RC filter circuit DC power supply circuit, this induction by current end is connected to wherein one group of low-voltage direct output of the DC power supply circuit of exchangeable type power supply circuit again, and this error protection output then is connected to this switching circuit by a buffer circuit; Wherein when power supply detects end, induction by current end or the change of external control end state; this error protection output can be by the control signal of buffer circuit output height different potentials, whether exports the dc supply of this direct-current power supply converting circuit to this power factor correction circuit and DC power supply circuit with decision.
7. tool according to claim 6 prevents the switched power supplier of surging function; it is characterized in that; this buffer circuit is an optical coupler; and this error protection output is connected to the light-emitting diode of this buffer circuit, and the control end of the electronic switch of this switching circuit is connected to the photistor of optical coupler.
8. tool according to claim 7 prevents the switched power supplier of surging function, it is characterized in that, this electronic switch is a PNP transistor, and its base stage is connected to the photistor of this optical coupler.
9. tool according to claim 8 prevents the switched power supplier of surging function, it is characterized in that, this controller is WT7515 model or WT7527 model integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920071731XU CN201466986U (en) | 2009-05-07 | 2009-05-07 | Switching power supplying device with function of preventing surging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920071731XU CN201466986U (en) | 2009-05-07 | 2009-05-07 | Switching power supplying device with function of preventing surging |
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| Publication Number | Publication Date |
|---|---|
| CN201466986U true CN201466986U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920071731XU Expired - Fee Related CN201466986U (en) | 2009-05-07 | 2009-05-07 | Switching power supplying device with function of preventing surging |
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| CN (1) | CN201466986U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300988A (en) * | 2016-08-31 | 2017-01-04 | 洛阳隆盛科技有限责任公司 | A kind of high-precision high pressure programmable power supply |
| CN108123429A (en) * | 2016-11-30 | 2018-06-05 | 亚荣源科技（深圳）有限公司 | Excess voltage protection |
-
2009
- 2009-05-07 CN CN200920071731XU patent/CN201466986U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300988A (en) * | 2016-08-31 | 2017-01-04 | 洛阳隆盛科技有限责任公司 | A kind of high-precision high pressure programmable power supply |
| CN106300988B (en) * | 2016-08-31 | 2019-01-08 | 洛阳隆盛科技有限责任公司 | A kind of high-precision high pressure programmable power supply |
| CN108123429A (en) * | 2016-11-30 | 2018-06-05 | 亚荣源科技（深圳）有限公司 | Excess voltage protection |
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