Constant voltage source and related methods, constant current source and related methods, devices and media

Abstract

The present invention discloses a constant voltage source and related methods, a constant current source and related methods, devices and media. The constant voltage source includes: a first switch circuit, one end of which is connected to the other end of a first feedback circuit; a first control circuit, which is used to respond to a first stop output instruction, control the first output relay to disconnect, the other end of the first switch circuit to switch to the middle node connected to the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit to zero; respond to a first normal output instruction, control the first output relay to close, and control the other end of the second switch circuit to switch to the end of the first output relay away from the first power amplifier circuit after delaying a preset closing time, and then control the first voltage input circuit to output a first target input voltage, and the preset closing time is greater than the closing time of the first output relay. The present invention can prevent the output relay from being fully biased when it is disconnected near one end of the source, as well as overcharging and jittering of the next output.

Description

Technical Field

[0001] The present invention relates to the field of electronic related technologies, and in particular to a constant voltage source and related methods, a constant current source and related methods, devices and media. Background Art

[0002] For constant current source and constant voltage source output systems, for safety reasons, we will add relays to the output end. When the output is not needed, the relay will be disconnected to completely disconnect the output from the load, thereby ensuring the safety of operators and equipment. However, this also introduces other problems, because the relay has an on-resistance. In order to ensure output accuracy, the sampling point of the feedback signal needs to be set at the end of the relay close to the output, that is, remote sampling, thereby eliminating the influence of the relay on-resistance on the output accuracy. However, when the relay is disconnected, the entire system will be open-loop. At this time, the voltage value of the relay close to the source end is equal to the product of the input voltage, the gain value of the gain circuit and the gain value of the power amplifier circuit. Since the gain value of the gain circuit is generally infinite, the gain value of the power amplifier circuit is a finite value, and the output of the voltage input circuit cannot reach absolute zero, the voltage value close to the source end will be full positive or full negative after the relay is disconnected, that is, it will reach the positive or negative maximum value of the power rail. When the output is needed next time, the output relay is closed, and the full-bias voltage close to the source end will be added to the load, resulting in output overcharge, and because the joint will jitter at the moment of relay closure (the time is generally in ms), it will eventually manifest as output overcharge accompanied by violent fluctuations until the system stabilizes and the output is normal. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a constant voltage source, which can prevent the output relay from being fully deflected at one end close to the source when the output relay is disconnected, and solve the problem of overcharging and jittering of the next output caused by the open loop after the output relay is disconnected.

[0004] The present invention also provides a constant voltage source control method, a constant current source, a constant current source control method, a control device for executing the above-mentioned constant voltage source control method and constant current source control method, and a computer-readable storage medium.

[0005] The constant pressure source according to the first aspect of the present invention comprises:

[0006] A first feedback circuit and a first voltage input circuit, a first gain circuit, a first power amplifier circuit and a first output relay connected in series in sequence, wherein the first voltage input circuit is used to output a first target input voltage, an end of the first output relay away from the first power amplifier circuit is used to output a first target output voltage, one end of the first feedback circuit is connected between the first voltage input circuit and the first gain circuit, and a difference between an actual resistance value of the first feedback circuit and a maximum resistance value of the feedback circuit is less than a preset resistance range;

[0007] a first switch circuit, one end of which is connected to the other end of the first feedback circuit, and the other end of which can be switched to be connected to an intermediate node between the first power amplifier circuit and the first output relay, or switched to be connected to an end of the first output relay away from the first power amplifier circuit;

[0008] The first control circuit is respectively connected to the first voltage input circuit, the first output relay and the first switch circuit. The first control circuit is used to respond to a first stop output instruction, control the first output relay to be disconnected, the other end of the first switch circuit to be switched to be connected to the middle node of the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit to be zero; respond to a first normal output instruction, control the first output relay to be closed, and control the other end of the first switch circuit to be switched to be connected to the end of the first output relay away from the first power amplifier circuit after a preset closing time, and then control the first voltage input circuit to output the first target input voltage, and the preset closing time is greater than the closing time of the first output relay.

[0009] The constant voltage source according to the embodiment of the present invention has at least the following beneficial effects:

[0010] One end of the first switch circuit is connected to the other end of the first feedback circuit, and the other end can be switched to be connected to the middle node between the first power amplifier circuit and the first output relay, or switched to be connected to the end of the first output relay away from the first power amplifier circuit. When the output is not needed, by controlling the first output relay to be disconnected, the other end of the first switch circuit to be switched to be connected to the middle node between the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit to be zeroed, the voltage value of the first output relay close to the source end can be made equal to the product of the first target input voltage and the inverse of the actual resistance value of the first feedback circuit. Since the actual resistance value of the first feedback circuit is a finite value, and the difference between the actual resistance value of the first feedback circuit and the maximum resistance value of the feedback circuit is less than the preset resistance value range, even if the output of the first voltage input circuit is set to zero and cannot reach an absolute zero value, the first output relay close to the source end will not be fully deflected. When output is needed next time, the jitter time of the first output relay closing can be avoided by first controlling the first output relay to close, and then controlling the other end of the first switch circuit to switch to the end of the first output relay away from the first power amplifier circuit after a delay greater than the closing time of the first output relay, and then controlling the first voltage input circuit to output the first target input voltage normally, thereby solving the problem of jitter when the output relay is closed. The constant voltage source of the embodiment of the present invention can prevent the output relay from being fully deflected near the source end when it is disconnected, and solve the problem of overcharging and jitter in the next output caused by the open loop after the output relay is disconnected.

[0011] According to some embodiments of the present invention, the first switch circuit uses a single-pole double-throw analog switch.

[0012] The control method of the constant pressure source according to the second aspect of the present invention is applied to the constant pressure source as described in the first aspect of the present invention, and the control method of the constant pressure source comprises the following steps:

[0013] In response to a first output stop instruction, the first output relay is controlled to be disconnected, the other end of the first switch circuit is switched to be connected to an intermediate node between the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit is set to zero;

[0014] In response to a first normal output instruction, the first output relay is controlled to close, and after a preset closing time, the other end of the first switch circuit is controlled to switch to be connected to an end of the first output relay away from the first power amplifier circuit, and then the first voltage input circuit is controlled to output the first target input voltage, and the preset closing time is greater than the closing time of the first output relay.

[0015] The control method of the constant voltage source according to the embodiment of the present invention has at least the following beneficial effects:

[0016] One end of the first switch circuit is connected to the other end of the first feedback circuit, and the other end can be switched to be connected to the middle node between the first power amplifier circuit and the first output relay, or switched to be connected to the end of the first output relay away from the first power amplifier circuit. When the output is not needed, by controlling the first output relay to be disconnected, the other end of the first switch circuit to be switched to be connected to the middle node between the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit to be zeroed, the voltage value of the first output relay close to the source end can be made equal to the product of the first target input voltage and the inverse of the actual resistance value of the first feedback circuit. Since the actual resistance value of the first feedback circuit is a finite value, and the difference between the actual resistance value of the first feedback circuit and the maximum resistance value of the feedback circuit is less than the preset resistance value range, even if the output of the first voltage input circuit is set to zero and cannot reach an absolute zero value, the first output relay close to the source end will not be fully deflected. When output is needed next time, the jitter time of the first output relay closing can be avoided by first controlling the first output relay to close, and then controlling the other end of the first switch circuit to switch to the end of the first output relay away from the first power amplifier circuit after a delay greater than the closing time of the first output relay, and then controlling the first voltage input circuit to output the first target input voltage normally, thereby solving the problem of jitter when the output relay is closed. The control method of the constant voltage source of the embodiment of the present invention can prevent the output relay from being fully deflected near one end of the source when it is disconnected, and solve the problem of overcharging and jitter in the next output caused by the open loop after the output relay is disconnected.

[0017] According to some embodiments of the present invention, in response to a first output stop instruction, controlling the first output relay to be disconnected, the other end of the first switch circuit to be switched to be connected to an intermediate node between the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit to be zero, comprises the following steps:

[0018] In response to the first output stop instruction, setting the output of the first voltage input circuit to zero;

[0019] The first output relay is controlled to be disconnected, and the other end of the first switch circuit is switched to be connected to an intermediate node between the first power amplifier circuit and the first output relay.

[0020] The constant current source according to the third aspect of the present invention comprises:

[0021] A second feedback circuit and a second voltage input circuit, a second gain circuit, a second power amplifier circuit, a second output relay and a current sampling resistor connected in series in sequence, the second voltage input circuit is used to output a second target input voltage, an intermediate node between the second output relay and the current sampling resistor is used to output a second target output voltage, one end of the second feedback circuit is connected between the second voltage input circuit and the second gain circuit, and a difference between an actual resistance value of the second feedback circuit and a maximum resistance value of the feedback circuit is less than a preset resistance range;

[0022] a second switch circuit, one end of which is connected to the other end of the second feedback circuit, and the other end of which can be switched to be connected to an intermediate node between the second power amplifier circuit and the second output relay, or switched to be connected to an intermediate node between the second output relay and the current sampling resistor;

[0023] The second control circuit is respectively connected to the second voltage input circuit, the second output relay and the second switch circuit. The second control circuit is used to respond to a second stop output instruction, control the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to the middle node between the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be zero; respond to a second normal output instruction, control the second output relay to be closed, and control the other end of the second switch circuit to be switched to be connected to the middle node between the second output relay and the current sampling resistor after a preset closing time, and then control the second voltage input circuit to output the second target input voltage, and the preset closing time is greater than the closing time of the second output relay.

[0024] The constant current source according to the embodiment of the present invention has at least the following beneficial effects:

[0025] One end of the second switch circuit is connected to the other end of the second feedback circuit, and the other end can be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, or switched to be connected to the middle node of the second output relay and the current sampling resistor. When the output is not needed, by controlling the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be zeroed, the voltage value of the second output relay close to the source end can be made equal to the product of the second target input voltage and the inverse of the actual resistance value of the second feedback circuit. Since the actual resistance value of the second feedback circuit is a finite value, and the difference between the actual resistance value of the second feedback circuit and the maximum resistance value of the feedback circuit is less than the preset resistance value range, even if the output of the second voltage input circuit is set to zero and cannot reach an absolute zero value, the second output relay close to the source end will not be fully deflected. When output is needed next time, by first controlling the second output relay to close, and delaying the closing time longer than the closing time of the second output relay, controlling the other end of the second switch circuit to switch to the middle node connected to the second output relay and the current sampling resistor, and then controlling the second voltage input circuit to normally output the second target input voltage, the jitter time of the second output relay closing moment can be avoided, thereby solving the problem of jitter when the output relay is closed. The constant current source of the embodiment of the present invention can prevent the output relay from being fully deflected near one end of the source when it is disconnected, and solve the problem of overcharging and jittering of the next output caused by the open loop after the output relay is disconnected.

[0026] According to some embodiments of the present invention, the second switch circuit uses a single-pole double-throw analog switch.

[0027] The control method of a constant current source according to a fourth aspect of the present invention is applied to the constant current source as described in the third aspect of the present invention, and the control method of the constant current source comprises the following steps:

[0028] In response to a second output stop instruction, the second output relay is controlled to be disconnected, the other end of the second switch circuit is switched to be connected to an intermediate node between the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit is set to zero;

[0029] In response to the second normal output instruction, the second output relay is controlled to close, and after delaying for a preset closing time, the other end of the second switch circuit is controlled to switch to a connection with an intermediate node between the second output relay and the current sampling resistor, and then the second voltage input circuit is controlled to output the second target input voltage, and the preset closing time is greater than the closing time of the second output relay.

[0030] The control method of the constant current source according to the embodiment of the present invention has at least the following beneficial effects:

[0031] One end of the second switch circuit is connected to the other end of the second feedback circuit, and the other end can be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, or switched to be connected to the middle node of the second output relay and the current sampling resistor. When the output is not needed, by controlling the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be zeroed, the voltage value of the second output relay close to the source end can be made equal to the product of the second target input voltage and the inverse of the actual resistance value of the second feedback circuit. Since the actual resistance value of the second feedback circuit is a finite value, and the difference between the actual resistance value of the second feedback circuit and the maximum resistance value of the feedback circuit is less than the preset resistance value range, even if the output of the second voltage input circuit is set to zero and cannot reach an absolute zero value, the second output relay close to the source end will not be fully deflected. When output is needed next time, the second output relay is controlled to close first, and the other end of the second switch circuit is controlled to switch to the middle node connected to the second output relay and the current sampling resistor after a delay greater than the closing time of the second output relay, and then the second voltage input circuit is controlled to output the second target input voltage normally, so as to avoid the jitter time of the second output relay closing, thereby solving the problem of jitter when the output relay is closed. The control method of the constant current source of the embodiment of the present invention can prevent the output relay from being fully deflected near one end of the source when it is disconnected, and solve the problem of overcharging and jitter of the next output caused by the open loop after the output relay is disconnected.

[0032] According to some embodiments of the present invention, in response to the second output stop instruction, controlling the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to the intermediate node between the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be zero, comprises the following steps:

[0033] In response to the second output stop instruction, setting the output of the second voltage input circuit to zero;

[0034] The second output relay is controlled to be disconnected, and the other end of the second switch circuit is switched to be connected to an intermediate node between the second power amplifier circuit and the second output relay.

[0035] According to the fifth aspect of the present invention, the control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the control method of the constant voltage source as described in the second aspect of the embodiment, and the control method of the constant current source as described in the fourth aspect of the embodiment. Since the control device adopts all the technical solutions of the control method of the constant voltage source and the control method of the constant current source of the above-mentioned embodiment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiment.

[0036] According to the computer-readable storage medium of the sixth aspect embodiment of the present invention, computer executable instructions are stored, and the computer executable instructions are used to execute the control method of the constant voltage source as described in the second aspect embodiment, and the control method of the constant current source as described in the fourth aspect embodiment. Since the computer-readable storage medium adopts all the technical solutions of the control method of the constant voltage source and the control method of the constant current source of the above-mentioned embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0037] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 It is a system block diagram of a constant pressure source in the prior art;

[0040] Figure 2 is a system block diagram of a constant pressure source according to an embodiment of the present invention;

[0041] Figure 3 is an electrical schematic diagram of a constant voltage source according to an embodiment of the present invention;

[0042] Figure 4 is a flow chart of a method for controlling a constant pressure source according to an embodiment of the present invention;

[0043] Figure 5 It is an output waveform diagram of controlling the other end of the first switch circuit to switch to be connected to the end of the first output relay away from the first power amplifier circuit after the preset closing time is not delayed in one embodiment of the present invention;

[0044] Figure 6 It is an output waveform diagram of controlling the other end of the first switch circuit to switch to be connected to the end of the first output relay away from the first power amplifier circuit after delaying the preset closing time in one embodiment of the present invention;

[0045] Figure 7 is a flow chart of a method for controlling a constant current source according to an embodiment of the present invention.

[0046] Reference numerals:

[0047] A first feedback circuit 100;

[0048] A first voltage input circuit 200;

[0049] A first gain circuit 300;

[0050] A first power amplifier circuit 400;

[0051] Adder 500. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] In the description of the present invention, if there is a description of first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0054] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0056] In order to better reflect the advantages of the constant voltage source of the embodiment of the present invention, the structure and defects of the constant voltage source in the prior art are first described in detail.

[0057] like Figure 1 As shown, Figure 1It is a system block diagram of a constant voltage source in the prior art, including a feedback circuit and a voltage input circuit, a gain circuit, a power amplifier circuit, and an output relay S1 connected in series in sequence. One end of the feedback circuit is connected between the voltage input circuit and the gain circuit, and the other end is connected to the end of the output relay S1 away from the power amplifier circuit. The voltage input circuit is used to output the input voltage Vi, and the end of the output relay S1 away from the power amplifier circuit is used to output the output voltage Vo. The voltage value of the intermediate node between the gain circuit and the power amplifier circuit is represented as Vo1, the voltage value of the output relay S1 close to the source end is represented as Vo2, the gain value of the gain circuit is represented as A1, the gain value of the power amplifier circuit is represented as A2, and the actual resistance value of the feedback circuit is represented as F. Among them, A1 is generally infinite, and A2 and F are both finite values. The output relay S1 is set for safety considerations. To ensure the output accuracy, the sampling point of the feedback signal is the right end of the output relay S1. When the output relay S1 is closed, it is in the normal output state, and Vo = Vi*A1*A2 / (1+A1*A2*F). Since A1 is large enough, Vo = Vi / F. When the output relay S1 is disconnected, Vo2 = Vi*A1*A2. Since A1 is large enough, as long as Vi is not equal to 0, Vo2 will approach the positive or negative power rail. In fact, even if Vi is generated by a more precise digital-to-analog converter (DAC), it cannot reach an absolute value of 0. In this way, when the output is needed next time, the output relay S1 is closed, and the full bias voltage on Vo2 will be added to the load, resulting in output overcharge, accompanied by jitter and other problems until the output is stable after the loop is closed.

[0058] The following will be combined Figures 1 to 6 A clear and complete description is given of the constant pressure source of the embodiment of the present invention. Obviously, the embodiment described below is only a part of the embodiment of the present invention, not all the embodiments.

[0059] The constant voltage source according to the first embodiment of the present invention includes a first feedback circuit 100, a first voltage input circuit 200, a first gain circuit 300, a first power amplifier circuit 400, a first output relay S1, a first switch circuit S2, and a first control circuit.

[0060] The first voltage input circuit 200, the first gain circuit 300, the first power amplifier circuit 400 and the first output relay S1 are connected in series in sequence, the first voltage input circuit 200 is used to output a first target input voltage, the end of the first output relay S1 away from the first power amplifier circuit 400 is used to output a first target output voltage, one end of the first feedback circuit 100 is connected between the first voltage input circuit 200 and the first gain circuit 300, and the difference between the actual resistance value of the first feedback circuit 100 and the maximum resistance value of the feedback circuit is less than a preset resistance range;

[0061] A first switch circuit S2, one end of which is connected to the other end of the first feedback circuit 100, and the other end of which can be switched to be connected to the middle node between the first power amplifier circuit 400 and the first output relay S1, or switched to be connected to the end of the first output relay S1 away from the first power amplifier circuit 400;

[0062] The first control circuit is respectively connected to the first voltage input circuit 200, the first output relay S1 and the first switch circuit S2. The first control circuit is used to respond to the first stop output instruction, control the first output relay S1 to disconnect, switch the other end of the first switch circuit S2 to connect to the middle node of the first power amplifier circuit 400 and the first output relay S1, and set the output of the first voltage input circuit 200 to zero; respond to the first normal output instruction, control the first output relay S1 to close, and control the other end of the first switch circuit S2 to switch to connect to the end of the first output relay S1 away from the first power amplifier circuit 400 after delaying for a preset closing time, and then control the first voltage input circuit 200 to output the first target input voltage, and the preset closing time is greater than the closing time of the first output relay S1.

[0063] like Figure 2 As shown, Figure 2 : This is a system block diagram of a constant voltage source according to an embodiment of the present invention. A first switch circuit S2 is added to the constant voltage source of the prior art. One end of the first switch circuit S2 is connected to the other end of the first feedback circuit 100, and the other end can be switched to connect to the middle node between the first power amplifier circuit 400 and the first output relay S1, or switched to connect to the end of the first output relay S1 away from the first power amplifier circuit 400. Figure 3 As shown, Figure 3 is an electrical schematic diagram of a constant voltage source according to an embodiment of the present invention, Figure 3 In the figure, DAC is the first voltage input circuit 200, which is used to output the first target input voltage Vi; the operational amplifier U1B is the first gain circuit 300, and its gain value A1 is infinite or at least large enough; Q1 and Q2 form an output pair tube, as the first power amplifier circuit 400, the power tube is a follower output, and its gain value A2 is less than 1; the resistor R1 and the resistor R2 form the first feedback circuit 100, and its actual resistance value F=R2 / (R1+R2) is a finite value. The voltage value of the middle node of the first gain circuit 300 and the first power amplifier circuit 400 is represented by Vo1, and the voltage value of the first output relay S1 close to the source end is represented by Vo2.

[0064] Next, Figure 3 The circuit structure of the constant voltage source of the embodiment of the present invention is described in detail, but Figure 3 The circuit structure in the figure is only an embodiment and cannot be regarded as a limitation of the present invention.

[0065] When output is not required, the first control circuit responds to the first stop output instruction, controls the first output relay S1 to be disconnected, the other end of the first switch circuit S2 is switched to be connected to the middle node between the first power amplifier circuit 400 and the first output relay S1, and the output of the first voltage input circuit 200 is set to zero. At this time, Vo=0, Vo2 depends on A1, A2, and F, and it can be calculated that Vo2=Vi / F. Since the maximum value of F is 1, and the larger F is, the smaller Vo2 is, by selecting the resistance values ​​of the resistors R1 and R2, the actual resistance value F of the first feedback circuit 100 is made to be 1 or at least close to 1 (that is, the difference between the actual resistance value F of the first feedback circuit 100 and the maximum resistance value of the feedback circuit is less than the preset resistance range), so that even if the output of the first voltage input circuit 200 cannot reach the absolute zero value after being set to zero, the first output relay S1 will not be fully deflected close to the source end.

[0066] Although the above solves the problem of Vo2 being fully biased when the output is turned off, it does not solve the problem of jitter when the first output relay S1 is closed. During the jitter process, the first output relay S1 keeps switching between opening and closing. The first switch circuit S2 is an analog switch with a switching time of tens of ns. When the first output relay S1 is still jittering, the first switch circuit S2 has already been stably connected to the Vo end. If the DAC has also started to output Vi, the system keeps switching between open loop and closed loop during the jitter, and Vo2 will also switch between the two states of tending to full bias and being controlled by the system, which will eventually lead to ms-level overcharging and jitter when the output is powered on.

[0067] Based on this, in the embodiment of the present invention, when output is needed next time, the first output relay S1 is controlled to close first, and after a delay greater than the closing time of the first output relay S1, the other end of the first switch circuit S2 is controlled to switch to the end of the first output relay S1 away from the first power amplifier circuit 400, and then the first voltage input circuit 200 is controlled to output the first target input voltage Vi normally, which can avoid the jitter time of the first output relay S1 closing moment, thereby solving the problem of jitter when the output relay is closed. Figure 5 As shown, Figure 5 This is an output waveform diagram of an embodiment of the present invention, in which the other end of the first switch circuit S2 is controlled to switch to the end of the first output relay S1 away from the first power amplifier circuit 400 without delay after the preset closing time. It can be seen from the figure that when there is no delay, that is, closing the first output relay S1 and controlling the other end of the first switch circuit S2 to switch to the end of the first output relay S1 away from the first power amplifier circuit 400 are carried out simultaneously, the output waveform is obviously overcharged and jittered. Figure 6 As shown, Figure 6This is an output waveform diagram of an embodiment of the present invention, in which the other end of the first switch circuit S2 is controlled to switch to be connected to the end of the first output relay S1 away from the first power amplifier circuit 400 after a preset delay closing time. The delay time is 1000μs. As can be seen from the figure, after the first output relay S1 is closed, the other end of the first switch circuit S2 is controlled to switch to be connected to the end of the first output relay S1 away from the first power amplifier circuit 400 after a delay of 1000μs, and the output waveform is smooth.

[0068] An adder 500 is further provided between the first voltage input circuit 200 and the first gain circuit 300. The working principle of the adder 500 is a prior art known to those skilled in the art and will not be described in detail herein.

[0069] According to the constant voltage source of the embodiment of the present invention, one end of the first switch circuit S2 is connected to the other end of the first feedback circuit 100, and the other end can be switched to be connected to the middle node between the first power amplifier circuit 400 and the first output relay S1, or switched to be connected to the end of the first output relay S1 away from the first power amplifier circuit 400. When the output is not needed, by controlling the first output relay S1 to be disconnected, the other end of the first switch circuit S2 to be switched to be connected to the middle node between the first power amplifier circuit 400 and the first output relay S1, and the output of the first voltage input circuit 200 to be zeroed, the voltage value of the first output relay S1 close to the source end can be made equal to the product of the first target input voltage and the inverse of the actual resistance value of the first feedback circuit 100. Since the actual resistance value of the first feedback circuit 100 is a finite value, and the difference between the actual resistance value of the first feedback circuit 100 and the maximum resistance value of the feedback circuit is less than the preset resistance value range, even if the output of the first voltage input circuit 200 does not reach an absolute zero value after being zeroed, the first output relay S1 close to the source end will not be fully deflected. When output is needed next time, by first controlling the first output relay S1 to close, and delaying the closing time longer than the closing time of the first output relay S1, the other end of the first switch circuit S2 is switched to connect to the end of the first output relay S1 away from the first power amplifier circuit 400, and then controlling the first voltage input circuit 200 to output the first target input voltage normally, the jitter time of the closing moment of the first output relay S1 can be avoided, thereby solving the problem of jitter when the output relay is closed. The constant voltage source of the embodiment of the present invention can prevent the output relay from being fully deflected near one end of the source when it is disconnected, and solve the problem of overcharging and jitter in the next output caused by the open loop after the output relay is disconnected.

[0070] In some embodiments of the present invention, reference Figure 2 and Figure 3 The first switch circuit S2 uses a single-pole double-throw analog switch. An analog switch is a switch element that uses a voltage or current signal input as a control variable and uses switch on or off as an output state.

[0071] Analog switches have the following advantages:

[0072] 1. High precision: Analog switches are suitable for occasions with high precision requirements and can achieve precise control of small currents.

[0073] 2. Fast dynamic response speed: Analog switches can respond quickly on demand and can better cope with dynamically changing control requirements.

[0074] 3. Convenient control signal input: The control signal of the analog switch can be an analog quantity, which is simple to operate and easy to control.

[0075] In the embodiment of the present invention, the accuracy requirement is relatively high and the control signal changes frequently. Selecting an analog switch as the first switch circuit S2 can better reflect the advantages of the constant current source in the embodiment of the present invention.

[0076] The following will be combined Figures 1 to 6 A clear and complete description is given of the control method of the constant pressure source of the embodiment of the present invention. Obviously, the embodiment described below is only a part of the embodiments of the present invention, not all of the embodiments.

[0077] The control method of the constant pressure source according to the second aspect of the present invention is applied to the constant pressure source of the first aspect of the present invention, and the control method of the constant pressure source comprises the following steps:

[0078] In response to the first output stop instruction, the first output relay S1 is controlled to be disconnected, the other end of the first switch circuit S2 is switched to be connected to the middle node between the first power amplifier circuit 400 and the first output relay S1, and the output of the first voltage input circuit 200 is set to zero;

[0079] In response to the first normal output instruction, the first output relay S1 is controlled to close, and after a preset closing time, the other end of the first switch circuit S2 is controlled to switch to be connected to the end of the first output relay S1 away from the first power amplifier circuit 400, and then the first voltage input circuit 200 is controlled to output the first target input voltage, and the preset closing time is greater than the closing time of the first output relay S1.

[0080] Since the control method of the constant voltage source adopts all the technical solutions of the constant voltage source of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0081] According to the control method of the constant voltage source of the embodiment of the present invention, one end of the first switch circuit S2 is connected to the other end of the first feedback circuit 100, and the other end can be switched to be connected to the middle node of the first power amplifier circuit 400 and the first output relay S1, or switched to be connected to the end of the first output relay S1 away from the first power amplifier circuit 400. When the output is not needed, by controlling the first output relay S1 to be disconnected, the other end of the first switch circuit S2 to be switched to be connected to the middle node of the first power amplifier circuit 400 and the first output relay S1, and the output of the first voltage input circuit 200 to be zeroed, the voltage value of the first output relay S1 close to the source end can be made equal to the product of the first target input voltage and the inverse of the actual resistance value of the first feedback circuit 100. Since the actual resistance value of the first feedback circuit 100 is a finite value, and the difference between the actual resistance value of the first feedback circuit 100 and the maximum resistance value of the feedback circuit is less than the preset resistance value range, even if the output of the first voltage input circuit 200 does not reach an absolute zero value after being set to zero, the first output relay S1 close to the source end will not be fully deflected. When output is needed next time, by first controlling the first output relay S1 to close, and delaying the closing time longer than the closing time of the first output relay S1, the other end of the first switch circuit S2 is switched to connect to the end of the first output relay S1 away from the first power amplifier circuit 400, and then controlling the first voltage input circuit 200 to output the first target input voltage normally, the jitter time of the closing moment of the first output relay S1 can be avoided, thereby solving the problem of jitter when the output relay is closed. The control method of the constant voltage source of the embodiment of the present invention can prevent the output relay from being fully deflected near one end of the source when it is disconnected, and solve the problem of overcharging and jitter of the next output caused by the open loop after the output relay is disconnected.

[0082] In some embodiments of the present invention, in response to the first output stop instruction, controlling the first output relay S1 to be disconnected, the other end of the first switch circuit S2 to be switched to be connected to the middle node between the first power amplifier circuit 400 and the first output relay S1, and the output of the first voltage input circuit 200 to be zero, comprises the following steps:

[0083] In response to the first output stop instruction, the output of the first voltage input circuit 200 is set to zero;

[0084] The first output relay S1 is controlled to be disconnected, and the other end of the first switch circuit S2 is switched to be connected to the middle node between the first power amplifier circuit 400 and the first output relay S1.

[0085] If there is a power-off time requirement, the output of the first voltage input circuit 200 can be set to zero first and then the first output relay S1 can be disconnected, and the other end of the first switch circuit S2 can be switched to connect to the middle node between the first power amplifier circuit 400 and the first output relay S1, because the first voltage input circuit 200 (such as DAC) controls the output to 0 faster than disconnecting the first output relay S1 to allow the residual charge of Vo to be consumed through the load.

[0086] The following will be combined Figures 1 to 7 A clear and complete description is given of the constant current source of the embodiment of the present invention. Obviously, the embodiment described below is only a part of the embodiment of the present invention, not all the embodiments.

[0087] According to the third aspect of the present invention, the constant current source includes a second feedback circuit, a second voltage input circuit, a second gain circuit, a second power amplifier circuit, a second output relay, a current sampling resistor, a second switch circuit, and a second control circuit.

[0088] A second voltage input circuit, a second gain circuit, a second power amplifier circuit, a second output relay and a current sampling resistor are sequentially connected in series, the second voltage input circuit is used to output a second target input voltage, an intermediate node between the second output relay and the current sampling resistor is used to output a second target output voltage, one end of the second feedback circuit is connected between the second voltage input circuit and the second gain circuit, and a difference between an actual resistance value of the second feedback circuit and a maximum resistance value of the feedback circuit is less than a preset resistance value range;

[0089] A second switch circuit, one end of which is connected to the other end of the second feedback circuit, and the other end of which can be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, or switched to be connected to the middle node of the second output relay and the current sampling resistor;

[0090] The second control circuit is respectively connected to the second voltage input circuit, the second output relay and the second switch circuit. The second control circuit is used to respond to the second stop output instruction, control the second output relay to disconnect, switch the other end of the second switch circuit to connect to the middle node of the second power amplifier circuit and the second output relay, and set the output of the second voltage input circuit to zero; respond to the second normal output instruction, control the second output relay to close, and control the other end of the second switch circuit to switch to connect to the middle node of the second output relay and the current sampling resistor after delaying for a preset closing time, and then control the second voltage input circuit to output the second target input voltage, and the preset closing time is greater than the closing time of the second output relay.

[0091] The only difference between the constant current source and the constant voltage source is that the constant current source also includes a current sampling resistor, and the rest of the structure is the same as the constant voltage source of the embodiment of the present invention. The specific working principle, process and technical effect are the same as the constant voltage source of the embodiment of the present invention, and will not be repeated here.

[0092] According to the constant current source of the embodiment of the present invention, one end of the second switch circuit is connected to the other end of the second feedback circuit, and the other end can be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, or switched to be connected to the middle node of the second output relay and the current sampling resistor. When the output is not needed, by controlling the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be zeroed, the voltage value of the second output relay close to the source end can be equal to the product of the second target input voltage and the inverse of the actual resistance value of the second feedback circuit. Since the actual resistance value of the second feedback circuit is a finite value, and the difference between the actual resistance value of the second feedback circuit and the maximum resistance value of the feedback circuit is less than the preset resistance value range, the second output relay close to the source end will not be fully deflected even if the output of the second voltage input circuit cannot reach the absolute zero value after being set to zero. When output is needed next time, by first controlling the second output relay to close, and delaying the closing time longer than the closing time of the second output relay, controlling the other end of the second switch circuit to switch to the middle node connected to the second output relay and the current sampling resistor, and then controlling the second voltage input circuit to normally output the second target input voltage, the jitter time of the second output relay closing moment can be avoided, thereby solving the problem of jitter when the output relay is closed. The constant current source of the embodiment of the present invention can prevent the output relay from being fully deflected near one end of the source when it is disconnected, and solve the problem of overcharging and jittering of the next output caused by the open loop after the output relay is disconnected.

[0093] In some embodiments of the present invention, reference Figure 2 and Figure 3 The second switch circuit uses a single-pole double-throw analog switch. An analog switch is a switch element that uses a voltage or current signal input as a control variable and uses switch on or off as an output state.

[0094] Analog switches have the following advantages:

[0095] 1. High precision: Analog switches are suitable for occasions with high precision requirements and can achieve precise control of small currents.

[0096] 2. Fast dynamic response speed: Analog switches can respond quickly on demand and can better cope with dynamically changing control requirements.

[0097] 3. Convenient control signal input: The control signal of the analog switch can be an analog quantity, which is simple to operate and easy to control.

[0098] In the embodiment of the present invention, the accuracy requirement is relatively high and the control signal changes frequently. Selecting an analog switch as the second switch circuit can better reflect the advantages of the constant current source of the embodiment of the present invention.

[0099] The following will be combined Figures 1 to 7 A control method for a constant current source according to an embodiment of the present invention is described clearly and completely. Obviously, the embodiment described below is only a part of the embodiments of the present invention, but not all of the embodiments.

[0100] The control method of the constant current source according to the fourth aspect of the present invention is applied to the constant current source of the third aspect of the present invention, and the control method of the constant current source comprises the following steps:

[0101] In response to the second output stop instruction, the second output relay is controlled to be disconnected, the other end of the second switch circuit is switched to be connected to the middle node between the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit is set to zero;

[0102] In response to the second normal output instruction, the second output relay is controlled to close, and after delaying the preset closing time, the other end of the second switch circuit is controlled to switch to the intermediate node connected to the second output relay and the current sampling resistor, and then the second voltage input circuit is controlled to output the second target input voltage, and the preset closing time is greater than the closing time of the second output relay.

[0103] Since the control method of the constant current source adopts all the technical solutions of the constant current source of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0104] According to the control method of the constant current source of the embodiment of the present invention, one end of the second switch circuit is connected to the other end of the second feedback circuit, and the other end can be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, or switched to be connected to the middle node of the second output relay and the current sampling resistor. When the output is not needed, by controlling the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to the middle node of the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be zeroed, the voltage value of the second output relay close to the source end can be equal to the product of the second target input voltage and the inverse of the actual resistance value of the second feedback circuit. Since the actual resistance value of the second feedback circuit is a finite value, and the difference between the actual resistance value of the second feedback circuit and the maximum resistance value of the feedback circuit is less than the preset resistance value range, the second output relay close to the source end will not be fully deflected even if the output of the second voltage input circuit cannot reach the absolute zero value after being zeroed. When output is needed next time, the second output relay is controlled to close first, and the other end of the second switch circuit is controlled to switch to the middle node connected to the second output relay and the current sampling resistor after a delay greater than the closing time of the second output relay, and then the second voltage input circuit is controlled to output the second target input voltage normally, so as to avoid the jitter time of the second output relay closing, thereby solving the problem of jitter when the output relay is closed. The control method of the constant current source of the embodiment of the present invention can prevent the output relay from being fully deflected near one end of the source when it is disconnected, and solve the problem of overcharging and jitter of the next output caused by the open loop after the output relay is disconnected.

[0105] In some embodiments of the present invention, in response to the second output stop instruction, controlling the second output relay to disconnect, the other end of the second switch circuit to switch to the middle node connected to the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to zero, includes the following steps:

[0106] In response to a second output stop instruction, setting the output of the second voltage input circuit to zero;

[0107] The second output relay is controlled to be disconnected, and the other end of the second switch circuit is switched to be connected to the middle node between the second power amplifier circuit and the second output relay.

[0108] If there is a power-off time requirement, the output of the second voltage input circuit can be set to zero first and then the second output relay can be disconnected, and the other end of the second switch circuit can be switched to connect to the middle node between the second power amplifier circuit and the second output relay, because the second voltage input circuit (such as DAC) controls the output to 0 faster than disconnecting the second output relay to allow the residual charge of Vo to be consumed through the load.

[0109] In addition, the fifth aspect of the present invention also provides a control device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor and the memory may be connected via a bus or other means.

[0110] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely disposed relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0111] The non-transient software programs and instructions required to implement the constant voltage source control method and the constant current source control method of the above-mentioned embodiments are stored in the memory, and when executed by the processor, the constant voltage source control method and the constant current source control method of the above-mentioned embodiments are executed.

[0112] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] In addition, the sixth aspect embodiment of the present invention also provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are executed by a processor or controller, for example, by a processor of the above-mentioned control device, so that the above-mentioned processor can execute the control method of the constant voltage source and the control method of the constant current source in the above-mentioned embodiment.

[0114] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0115] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A constant pressure source, characterized in that: include: A first feedback circuit and a first voltage input circuit, a first gain circuit, a first power amplifier circuit and a first output relay connected in series in sequence, wherein the first voltage input circuit is used to output a first target input voltage, an end of the first output relay away from the first power amplifier circuit is used to output a first target output voltage, one end of the first feedback circuit is connected between the first voltage input circuit and the first gain circuit, and a difference between an actual resistance value of the first feedback circuit and a maximum resistance value of the feedback circuit is less than a preset resistance range; a first switch circuit, one end of which is connected to the other end of the first feedback circuit, and the other end of which can be switched to be connected to an intermediate node between the first power amplifier circuit and the first output relay, or switched to be connected to an end of the first output relay away from the first power amplifier circuit; a first control circuit, connected to the first voltage input circuit, the first output relay and the first switch circuit respectively, the first control circuit being used to control the first output relay to be disconnected, the other end of the first switch circuit to be switched to be connected to an intermediate node between the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit to be set to zero in response to a first output stop instruction; In response to a first normal output instruction, the first output relay is controlled to close, and after a preset closing time, the other end of the first switch circuit is controlled to switch to be connected to an end of the first output relay away from the first power amplifier circuit, and then the first voltage input circuit is controlled to output the first target input voltage, and the preset closing time is greater than the closing jitter time of the first output relay.

2. The constant pressure source according to claim 1, characterized in that: The first switch circuit adopts a single-pole double-throw analog switch.

3. A method for controlling a constant voltage source, characterized in that: Applied to the constant pressure source as claimed in claim 1 or 2, the control method of the constant pressure source comprises the following steps: In response to a first output stop instruction, the first output relay is controlled to be disconnected, the other end of the first switch circuit is switched to be connected to an intermediate node between the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit is set to zero; In response to a first normal output instruction, the first output relay is controlled to close, and after a preset closing time, the other end of the first switch circuit is controlled to switch to be connected to an end of the first output relay away from the first power amplifier circuit, and then the first voltage input circuit is controlled to output the first target input voltage, and the preset closing time is greater than the closing jitter time of the first output relay.

4. The control method of the constant voltage source according to claim 3, characterized in that: The method of responding to the first output stop instruction, controlling the first output relay to be disconnected, the other end of the first switch circuit to be switched to be connected to the intermediate node between the first power amplifier circuit and the first output relay, and the output of the first voltage input circuit to be zero, comprises the following steps: In response to the first output stop instruction, the output of the first voltage input circuit is first set to zero, and then the first output relay is controlled to be disconnected and the other end of the first switch circuit is switched to be connected to the intermediate node between the first power amplifier circuit and the first output relay.

5. A constant current source, characterized in that: include: A second feedback circuit and a second voltage input circuit, a second gain circuit, a second power amplifier circuit, a second output relay and a current sampling resistor connected in series in sequence, the second voltage input circuit is used to output a second target input voltage, an intermediate node between the second output relay and the current sampling resistor is used to output a second target output voltage, one end of the second feedback circuit is connected between the second voltage input circuit and the second gain circuit, and a difference between an actual resistance value of the second feedback circuit and a maximum resistance value of the feedback circuit is less than a preset resistance range; a second switch circuit, one end of which is connected to the other end of the second feedback circuit, and the other end of which can be switched to be connected to an intermediate node between the second power amplifier circuit and the second output relay, or switched to be connected to an intermediate node between the second output relay and the current sampling resistor; a second control circuit, connected to the second voltage input circuit, the second output relay and the second switch circuit respectively, the second control circuit being used for controlling the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to an intermediate node between the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be set to zero in response to a second output stop instruction; In response to the second normal output instruction, the second output relay is controlled to close, and after a preset closing time, the other end of the second switch circuit is controlled to switch to a connection with the middle node between the second output relay and the current sampling resistor, and then the second voltage input circuit is controlled to output the second target input voltage, and the preset closing time is greater than the closing jitter time of the second output relay.

6. The constant current source according to claim 5, characterized in that: The second switch circuit adopts a single-pole double-throw analog switch.

7. A method for controlling a constant current source, characterized in that: Applied to the constant current source as claimed in claim 5 or 6, the control method of the constant current source comprises the following steps: In response to a second output stop instruction, the second output relay is controlled to be disconnected, the other end of the second switch circuit is switched to be connected to an intermediate node between the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit is set to zero; In response to the second normal output instruction, the second output relay is controlled to close, and after a preset closing time, the other end of the second switch circuit is controlled to switch to a connection with the middle node between the second output relay and the current sampling resistor, and then the second voltage input circuit is controlled to output the second target input voltage, and the preset closing time is greater than the closing jitter time of the second output relay.

8. The constant current source control method according to claim 7, characterized in that: The method of responding to the second output stop instruction, controlling the second output relay to be disconnected, the other end of the second switch circuit to be switched to be connected to the middle node between the second power amplifier circuit and the second output relay, and the output of the second voltage input circuit to be zero, comprises the following steps: In response to the second output stop instruction, the output of the second voltage input circuit is first set to zero, and then the second output relay is controlled to be disconnected and the other end of the second switch circuit is switched to be connected to the intermediate node between the second power amplifier circuit and the second output relay.

9. A control device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the constant voltage source control method according to claim 3 or 4 and the constant current source control method according to claim 7 or 8 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, characterized in that: The computer executable instructions are used to execute the control method of the constant voltage source as described in claim 3 or 4, and the control method of the constant current source as described in claim 7 or 8.

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