CN208890645U - Multiple-output electric power - Google Patents
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Abstract
The utility model provides a kind of multiple-output electric power, including at least sequential control circuit all the way.Multichannel sequential export may be implemented, the time that every road output voltage is established is set as needed.Output is opened in bypass delay for control switch power supply product, is started application demand to solve the timing of client's multiple equipment, while reducing cost, is occupied little space, when this circuit be can be used in the Switching Power Supply of doubleway output or more, effect is the most obvious.
Description
Technical Field
The utility model relates to a switching power supply field, it is specific, relate to multiplexed output's switching power supply.
Background
In the current switching power supply, a plurality of switching power supply products realize multi-path output so as to meet the use of a plurality of devices of a client, simultaneously, the cost is greatly reduced, one-to-one application of one switching power supply product corresponding to one device is not needed, so that the multi-path output switching power supply product becomes the application first choice of the client; at present, many devices need a time sequence starting or shutting-off condition, for example, one device is started first, and other devices are started after delaying for a period of time, so as to ensure normal operation of the devices or store data; the solution of the current industry is to use a power strip of a time-series power supply or a plurality of switching power supply products to be realized in a software compatible manner, as shown in fig. 1, but the cost is too high, the occupied space is large, and the solution is not desired by manufacturers and customers and is not the optimal solution; the cost of using a single switching power supply to contain multi-path output is optimal, and the main and auxiliary circuits meet safety regulation isolation, but the output voltage of the main and auxiliary circuits of the switching power supply product is almost simultaneously established and does not meet the timing sequence application of customers.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a multiplexed output power supply to above problem for the output is opened in the time delay of the owner of control switching power supply product and/or the auxiliary road, starts the application demand with the chronogenesis of solving a plurality of equipment of customer, and reduce cost simultaneously, occupation space is little, and when this circuit can be arranged in the switching power supply more than the double-circuit output, the effect is more obvious.
The utility model aims at realizing through the following technical scheme:
the utility model provides a multiple output power, secondary winding including two at least transformers, a secondary winding forms main output circuit, other secondary windings form and assist output circuit, add the sequential control circuit at assisting output circuit, the sequential control circuit includes the MOS pipe, resistance and electric capacity, the MOS pipe is gone into between secondary winding and the output pole, the one end of secondary winding and the one end of electric capacity are connected respectively to the drain electrode of MOS pipe promptly, the source electrode and the output negative pole of MOS pipe are connected, the one end of resistance and the other end of electric capacity are connected respectively to the grid of MOS pipe, the other end and the output positive pole of resistance are connected.
Preferably, the main output circuit is additionally provided with a time sequence control circuit, the time sequence control circuit comprises an MOS tube, a resistor and a capacitor, the MOS tube is connected between the secondary winding and the output electrode in series, namely, the drain electrode of the MOS tube is respectively connected with one end of the secondary winding and one end of the capacitor, the source electrode of the MOS tube is connected with the output cathode, the gate electrode of the MOS tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output anode.
Preferably, the sequential control circuit further comprises a voltage regulator tube, the voltage regulator tube is connected in series between the gate of the MOS tube and the connection ends of the resistor and the capacitor, namely, the anode of the voltage regulator tube is connected with the gate of the MOS tube, and the cathode of the voltage regulator tube is respectively connected with one end of the resistor and the other end of the capacitor.
The utility model discloses still provide multichannel output power, including the secondary winding of two at least transformers, a secondary winding forms main output circuit, and output circuit is assisted in other secondary winding formation, adds sequential control circuit assisting output circuit, and sequential control circuit includes MOS pipe, resistance and electric capacityThe MOS tube is connected between the secondary winding and the output electrode in series, namely the drain electrode of the MOS tube is respectively connected with the secondary winding and one electrode of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive electrode; the output voltage establishment time of the sequential control circuit follows the following relation:wherein VQ is the conduction voltage of the MOS tube, Vo + is the output voltage of the power supply, t is the setup time of the output voltage, R is the resistance value of the resistor, and C is the capacitance value of the capacitor.
Preferably, the main output circuit is additionally provided with a time sequence control circuit, the time sequence control circuit comprises an MOS tube, a resistor and a capacitor, the MOS tube is connected between the secondary winding and the output electrode in series, namely, the drain electrode of the MOS tube is respectively connected with one end of the secondary winding and one end of the capacitor, the source electrode of the MOS tube is connected with the output cathode, the gate electrode of the MOS tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output anode.
The utility model provides a multichannel output power supply again, secondary winding including two at least transformers, a secondary winding forms main output circuit, other secondary windings form and assist output circuit, add the sequential control circuit at assisting output circuit, the sequential control circuit includes MOS pipe, resistance, electric capacity and stabilivolt, the MOS pipe is gone here and there between secondary winding and the output pole, the drain electrode of MOS pipe connects one utmost point of secondary winding and electric capacity respectively promptly, the source electrode and the output negative pole of MOS pipe are connected, the grid of MOS pipe is connected with the positive pole of stabilivolt, the negative pole of stabilivolt is the one end of connecting resistance and the other end of electric capacity respectively, the other end and the output positive pole of resistance are connected; the breakdown voltage of the voltage-stabilizing tube is greater than the conduction voltage of the MOS tube, and the output voltage establishment time of the sequential control circuit follows the following relational expression:wherein, VZIs the breakdown voltage of the voltage regulator tube, Vo + is the output voltage of the power supply, and t is the output voltageIn the standing time, R is the resistance value of the resistor, and C is the capacitance value of the capacitor.
Preferably, the main output circuit is additionally provided with a time sequence control circuit, the time sequence control circuit comprises an MOS tube, a resistor, a capacitor and a voltage-regulator tube, the MOS tube is connected between the secondary winding and the output electrode in series, namely, the drain electrode of the MOS tube is respectively connected with the secondary winding and one electrode of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is connected with the anode of the voltage-regulator tube, the cathode of the voltage-regulator tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive electrode.
Compared with the prior art, the utility model discloses a multiplexed output power has following beneficial effect:
1) the scheme has the advantages of simple circuit, easy design, convenient debugging and low cost;
2) the utility model can control the delayed opening time of each output of the product, and establish the output according to the time sequence;
3) the utility model changes the control of a plurality of products into the control of a single multi-output power supply product, thereby greatly reducing the cost and saving the use space;
4) the utility model discloses do not influence the ann rule isolation between former vice limit, each output, can not reduce the reliability of product.
Drawings
FIG. 1 is a schematic block diagram of a prior art multiple output timing start circuit;
fig. 2 is a schematic block diagram of a sequential control circuit of the multiple output power supply of the present invention in an application system;
FIG. 3 is a schematic diagram of a first embodiment of the multi-output power supply of the present invention;
FIG. 4 is a schematic diagram of a second embodiment of the multi-output power supply of the present invention;
fig. 4-1 is a waveform diagram illustrating the 24V output voltage set-up time according to the second embodiment of the present invention;
fig. 4-2 is a waveform diagram illustrating the 12V output voltage set-up time according to the second embodiment of the present invention.
Detailed Description
As shown in fig. 2, for the utility model discloses the functional block diagram of the sequential control circuit of multiplexed output power supply in application system, a multiplexed output power supply can set up the time that every way output voltage established as required to realize the time sharing sequence power supply needs of multichannel equipment among the application system. Or only one output can be used for time sequence setting, and the number of the power output paths can be specifically determined according to the requirements of an application system.
For convenience of description, the serial numbers of the output circuits and the serial numbers of the components are coded according to a certain rule, wherein the first number represents the serial number of the component, the second number represents the serial number of the output circuits, such as a capacitor C11, the first 1 represents a capacitor C1 (or called a first capacitor), and the second 1 represents a capacitor C1 in the first output circuit; the capacitor C12 is the capacitor C1 in the second output circuit; the resistor R11 is the resistor R1 in the first output circuit, and the resistor R12 is the resistor R1 in the second output circuit. It is noted that, for convenience, the second number in which the output circuit number is indicated may be omitted in some cases below, and only the first number as the component number is retained.
The principles and embodiments of the present invention are described in detail below with reference to the accompanying drawings.
First embodiment
As shown in fig. 3, a schematic diagram of a multiple output power supply according to a first embodiment of the present invention is a multiple output power supply, which includes secondary windings of at least two transformers, one secondary winding forms a main output circuit (hereinafter, may be referred to as a main circuit), and the other secondary windings form an auxiliary output circuit (hereinafter, may be referred to as an auxiliary circuit), and a timing control circuit 10 of the main output circuit and a timing control circuit 20 of the auxiliary output circuit can be set as required, so as to meet the requirement of time-sharing sequence power supply of multiple devices in an application system; only the timing control circuit 10 of the main output circuit or the timing control circuit 20 of the sub output circuit may be provided. The structure of the timing control circuit in the main and auxiliary output circuits is the same, and the timing control circuit 10 of the main output circuit is used as an example to illustrate the utility model discloses a multiple output power supply, the timing control circuit 10 includes MOS pipe Q11, resistance R11 and electric capacity C11, MOS pipe Q11 is strung between secondary winding Ns11 and output pole Vo1, namely the drain electrode of MOS pipe Q11 is connected with the one end of secondary winding Ns11 and the one end of electric capacity C11 respectively, the source electrode of MOS pipe Q11 is connected with output negative pole Vo1-, the gate electrode of MOS pipe Q11 is connected with the one end of resistance R11 and the other end of electric capacity C11 respectively, the other end of resistance R11 is connected with output positive pole Vo1 +.
The working principle of the timing control circuit is described by taking a main output circuit of two output power supplies as an example: when the power supply is not powered on, the MOS tube Q1 is in a cut-off state, when the power supply is started, the main output anode Vo1+ charges the capacitor C1 through the resistor R1, the voltage at two ends of the capacitor C1 gradually rises, after a period of time, when the voltage at two ends of the capacitor C1 reaches the turn-on voltage of the MOS tube Q1, the MOS tube Q1 is turned on, and one path of output of the power supply is established; when the power supply is disconnected and input, the voltage at the two ends of the capacitor C1 gradually drops and is lower than the on-state voltage of the MOS transistor Q1, the MOS transistor Q1 is cut off, and the power supply output is disconnected; the same is true of other side road principles.
According to actual needs, the time t1 and t2 for establishing each output voltage can be set, and the parameters of components in the circuit are designed according to t1 and t2, so that the required time sequence conduction of each output can be realized. The calculation formula is as follows:
note: vQIs the turn-on voltage of MOS transistor, Vo + is the output voltage of power supply, t is the setup time of output voltage, and R is resistanceThe resistance value C is the capacitance value of the capacitor. For example, when the timing control circuit 10 of the main output circuit is designed, the calculation formula is as follows,
when the timing control circuit 20 of the auxiliary output circuit is designed, the calculation formula is as follows,
wherein,
VQ11: the MOS transistor Q11 conducts voltage; vQ12: the MOS transistor Q12 conducts voltage;
vo1 +: a main circuit output voltage of the power supply; vo2 +: the auxiliary circuit output voltage of the power supply;
t 1: the setup time of the main circuit output voltage; t 2: the establishment time of the auxiliary circuit output voltage;
r11: resistance of the resistor R1 in the main circuit, R12: the resistance of the resistor R1 in the auxiliary circuit;
c11: capacitance value of the capacitor C1 in the main path, C12: the capacitance value of the capacitor C1 in the auxiliary circuit.
The utility model discloses multiplexed output power supply can control the time delay opening time of each output of power through the sequential control circuit, forms and establishes each way output according to the chronogenesis to improve a plurality of product control that have now and realize for single multiplexed output power supply product control, greatly the cost is reduced has saved the usage space, but also does not influence the ann rule isolation between former vice limit, each output, can not reduce power product's reliability. When the circuit of the utility model is used for the switching power supply above the two-way output, the effect is more obvious.
Second embodiment
As shown in fig. 4, which is a schematic diagram of a multiple output power supply according to a second embodiment of the present invention, a multiple output power supply is different from the first embodiment in that a voltage regulator tube Z1 is connected in series between the positive electrode of a capacitor C1 and the driving pin of a MOS transistor Q1; namely, a voltage regulator tube Z1 is connected in series between the grid of the MOS tube Q1 and the connecting ends of the resistor R1 and the capacitor C1, the anode of the voltage regulator tube Z1 is connected with the grid of the MOS tube Q1, and the cathode of the voltage regulator tube Z1 is respectively connected with one end of the resistor R1 and the other end of the capacitor C1.
Now, the connection relationship of the timing control circuit of the main output circuit is described as follows: the timing control circuit comprises an MOS tube Q11, a resistor R11, a capacitor C11 and a voltage-stabilizing tube Z11, wherein the MOS tube Q11 is connected in series between a secondary winding Ns11 and an output electrode Vo1, namely, the drain electrode of the MOS tube Q11 is respectively connected with one end of the secondary winding Ns11 and one end of the capacitor C11, the source electrode of the MOS tube Q11 is connected with an output negative electrode Vo1-, the gate electrode of the MOS tube Q11 is connected with the anode of the voltage-stabilizing tube Z11, the cathode of the voltage-stabilizing tube Z11 is respectively connected with one end of the resistor R11 and the other end of the capacitor C11, and the other end of the resistor R11 is connected with an output positive electrode Vo1 +.
The addition of zener diode Z11 acts to extend the voltage settling time of the sequential circuit.
The working principle of the timing control circuit is described by taking a main output circuit of two output power supplies as an example: when the power supply is not electrified, the MOS tube Q1 is in a cut-off state, when the power supply is started, the main circuit output anode Vo + charges the capacitor C1 through the resistor R1, the voltage at two ends of the capacitor C1 gradually rises, after a period of time, the voltage at two ends of the capacitor C1 is greater than the clamping voltage of the voltage regulator tube Z1 to break down and conduct, when the conducting voltage of the MOS tube Q1 is reached, the MOS tube Q1 is conducted, and one path of output of the power supply is established; when the power supply is disconnected and input, the voltage at the two ends of the capacitor C1 gradually drops and is lower than the on-state voltage of the MOS transistor Q1, the MOS transistor Q1 is cut off, and the power supply output is disconnected; the same is true of other side road principles.
Breakdown voltage of the regulator tube Z1 > the turn-on voltage of the MOS tube Q1. According to actual needs, the time t1 and t2 for establishing each output voltage can be set, and the parameters of components in the circuit are designed according to t1 and t2, so that the required time sequence conduction of each output can be realized. The calculation formula is as follows:
note: vZThe breakdown voltage of the voltage regulator tube is Vo +, the output voltage of the power supply is Vo +, t is the establishment time of the output voltage, R is the resistance value of the resistor, and C is the capacitance value of the capacitor. For example, when designing the timing control circuit of the main output circuit, the calculation formula is as follows,
when the time sequence control circuit of the auxiliary output circuit is designed, the calculation formula is as follows,
wherein,
VZ11: breakdown voltage of the zener diode Z11; vZ12: breakdown voltage of the zener diode Z12;
vo1 +: a main circuit output voltage of the power supply; vo2 +: the auxiliary circuit output voltage of the power supply;
t 1: the setup time of the main circuit output voltage; t 2: the establishment time of the auxiliary circuit output voltage;
r11: resistance of the resistor R1 in the main circuit, R12: the resistance of the resistor R1 in the auxiliary circuit;
c11: capacitance value of the capacitor C1 in the main path, C12: the capacitance value of the capacitor C1 in the auxiliary circuit.
The time t for establishing output is set firstly, the capacitor C11 can be determined firstly according to experience, then the value of R11 is calculated, and the actual value of R11 can be a little bit smaller for ensuring that the voltage regulator tube is broken down and conducted and considering the parameter error of the device.
The working principle of the other path of output of the power supply is consistent with that of the power supply, the time sequence time t2 is set, and the time sequence time t2 is substituted into a formula to calculate according to requirements.
The triode in the power circuit is a switching device, and other switching devices such as an MOS tube and the like can be selected, and the triode still falls within the protection scope of the patent.
And (3) testing and verifying:
conditions are as follows: the product of the embodiment is a double-output product, one output is 12V, the other output is 24V, 12V output voltage is established after 1000ms after the product is electrified, and 24V output voltage is established after 2000 ms; FIGS. 4-1 and 4-2 are graphs of test waveforms established for output voltages of 24V output and 12V output, respectively, in which:
port CH 1: input voltage waveform, port CH 2: 24V output voltage waveform, port CH 3: 12V output voltage waveform.
As can be seen from the ripple, the 24V output setup time is 2087ms, and the 12V output 1028ms is almost consistent with the design specification, and the error is mainly caused by the error of the device, the charging time of the VCC voltage of the IC, and the error needs to be considered during the design.
Above is only the preferred embodiment of the present invention, it should be noted that the above preferred embodiment should not be regarded as the limitation of the present invention, on the basis of the schematic diagram of the drawings of the present invention, for those skilled in the art, without departing from the spirit and scope of the present invention, other improvements and decorations can be made, for example, the control circuit is replaced by a circuit composed of an operational amplifier and a triode, and still the same function can be realized.
Claims (7)
1. The utility model provides a multiplexed output power, includes the secondary winding of two at least transformers, and a secondary winding forms main output circuit, and other secondary windings form supplementary output circuit, its characterized in that:
the auxiliary output circuit is additionally provided with a time sequence control circuit, the time sequence control circuit comprises an MOS tube, a resistor and a capacitor, the MOS tube is connected between the secondary winding and the output electrode in series, namely the drain electrode of the MOS tube is respectively connected with one end of the secondary winding and one end of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive electrode.
2. The multi-output power supply of claim 1, wherein: the time sequence control circuit is additionally arranged on the main output circuit and comprises an MOS tube, a resistor and a capacitor, the MOS tube is connected between the secondary winding and the output electrode in series, namely the drain electrode of the MOS tube is respectively connected with one end of the secondary winding and one end of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive electrode.
3. The multi-output power supply according to claim 1 or 2, wherein: the time sequence control circuit also comprises a voltage-stabilizing tube, wherein the voltage-stabilizing tube is connected between the grid of the MOS tube and the connecting ends of the resistor and the capacitor in series, namely, the anode of the voltage-stabilizing tube is connected with the grid of the MOS tube, and the cathode of the voltage-stabilizing tube is respectively connected with one end of the resistor and the other end of the capacitor.
4. The utility model provides a multiplexed output power, includes the secondary winding of two at least transformers, and a secondary winding forms main output circuit, and other secondary windings form supplementary output circuit, its characterized in that:
a time sequence control circuit is additionally arranged on the auxiliary output circuit, the time sequence control circuit comprises an MOS tube, a resistor and a capacitor, the MOS tube is connected between the secondary winding and the output electrode in series, namely the drain electrode of the MOS tube is respectively connected with the secondary winding and one electrode of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive electrode; the output voltage establishment time of the sequential control circuit follows the following relation:
wherein VQ is the conduction voltage of the MOS tube, Vo + is the output voltage of the power supply, t is the setup time of the output voltage, R is the resistance value of the resistor, and C is the capacitance value of the capacitor.
5. The multi-output power supply of claim 4, wherein: the time sequence control circuit is additionally arranged on the main output circuit and comprises an MOS tube, a resistor and a capacitor, the MOS tube is connected between the secondary winding and the output electrode in series, namely the drain electrode of the MOS tube is respectively connected with one end of the secondary winding and one end of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive electrode.
6. The utility model provides a multiplexed output power, includes the secondary winding of two at least transformers, and a secondary winding forms main output circuit, and other secondary windings form supplementary output circuit, its characterized in that:
the auxiliary output circuit is additionally provided with a time sequence control circuit, the time sequence control circuit comprises an MOS tube, a resistor, a capacitor and a voltage-stabilizing tube, the MOS tube is connected between the secondary winding and the output electrode in series, namely the drain electrode of the MOS tube is respectively connected with the secondary winding and one electrode of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is connected with the anode of the voltage-stabilizing tube, the cathode of the voltage-stabilizing tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive; the breakdown voltage of the voltage-stabilizing tube is greater than the conduction voltage of the MOS tube, and the output voltage establishment time of the sequential control circuit follows the following relational expression:
wherein, VZThe breakdown voltage of the voltage regulator tube is Vo +, the output voltage of the power supply is Vo +, t is the establishment time of the output voltage, R is the resistance value of the resistor, and C is the capacitance value of the capacitor.
7. The multi-output power supply of claim 6, wherein: the main output circuit is also additionally provided with a time sequence control circuit, the time sequence control circuit comprises an MOS tube, a resistor, a capacitor and a voltage-stabilizing tube, the MOS tube is connected between the secondary winding and the output electrode in series, namely the drain electrode of the MOS tube is respectively connected with the secondary winding and one electrode of the capacitor, the source electrode of the MOS tube is connected with the output negative electrode, the grid electrode of the MOS tube is connected with the anode of the voltage-stabilizing tube, the cathode of the voltage-stabilizing tube is respectively connected with one end of the resistor and the other end of the capacitor, and the other end of the resistor is connected with the output positive.
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